linux/drivers/scsi/libfc/fc_exch.c

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/*
* Copyright(c) 2007 Intel Corporation. All rights reserved.
* Copyright(c) 2008 Red Hat, Inc. All rights reserved.
* Copyright(c) 2008 Mike Christie
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License along with
* this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
*
* Maintained at www.Open-FCoE.org
*/
/*
* Fibre Channel exchange and sequence handling.
*/
#include <linux/timer.h>
#include <linux/gfp.h>
#include <linux/err.h>
#include <scsi/fc/fc_fc2.h>
#include <scsi/libfc.h>
#include <scsi/fc_encode.h>
static struct kmem_cache *fc_em_cachep; /* cache for exchanges */
/*
* Structure and function definitions for managing Fibre Channel Exchanges
* and Sequences.
*
* The three primary structures used here are fc_exch_mgr, fc_exch, and fc_seq.
*
* fc_exch_mgr holds the exchange state for an N port
*
* fc_exch holds state for one exchange and links to its active sequence.
*
* fc_seq holds the state for an individual sequence.
*/
/*
* Exchange manager.
*
* This structure is the center for creating exchanges and sequences.
* It manages the allocation of exchange IDs.
*/
struct fc_exch_mgr {
enum fc_class class; /* default class for sequences */
struct kref kref; /* exchange mgr reference count */
spinlock_t em_lock; /* exchange manager lock,
must be taken before ex_lock */
u16 next_xid; /* next possible free exchange ID */
u16 min_xid; /* min exchange ID */
u16 max_xid; /* max exchange ID */
u16 max_read; /* max exchange ID for read */
u16 last_read; /* last xid allocated for read */
u32 total_exches; /* total allocated exchanges */
struct list_head ex_list; /* allocated exchanges list */
mempool_t *ep_pool; /* reserve ep's */
/*
* currently exchange mgr stats are updated but not used.
* either stats can be expose via sysfs or remove them
* all together if not used XXX
*/
struct {
atomic_t no_free_exch;
atomic_t no_free_exch_xid;
atomic_t xid_not_found;
atomic_t xid_busy;
atomic_t seq_not_found;
atomic_t non_bls_resp;
} stats;
struct fc_exch **exches; /* for exch pointers indexed by xid */
};
#define fc_seq_exch(sp) container_of(sp, struct fc_exch, seq)
struct fc_exch_mgr_anchor {
struct list_head ema_list;
struct fc_exch_mgr *mp;
bool (*match)(struct fc_frame *);
};
static void fc_exch_rrq(struct fc_exch *);
static void fc_seq_ls_acc(struct fc_seq *);
static void fc_seq_ls_rjt(struct fc_seq *, enum fc_els_rjt_reason,
enum fc_els_rjt_explan);
static void fc_exch_els_rec(struct fc_seq *, struct fc_frame *);
static void fc_exch_els_rrq(struct fc_seq *, struct fc_frame *);
static struct fc_seq *fc_seq_start_next_locked(struct fc_seq *sp);
/*
* Internal implementation notes.
*
* The exchange manager is one by default in libfc but LLD may choose
* to have one per CPU. The sequence manager is one per exchange manager
* and currently never separated.
*
* Section 9.8 in FC-FS-2 specifies: "The SEQ_ID is a one-byte field
* assigned by the Sequence Initiator that shall be unique for a specific
* D_ID and S_ID pair while the Sequence is open." Note that it isn't
* qualified by exchange ID, which one might think it would be.
* In practice this limits the number of open sequences and exchanges to 256
* per session. For most targets we could treat this limit as per exchange.
*
* The exchange and its sequence are freed when the last sequence is received.
* It's possible for the remote port to leave an exchange open without
* sending any sequences.
*
* Notes on reference counts:
*
* Exchanges are reference counted and exchange gets freed when the reference
* count becomes zero.
*
* Timeouts:
* Sequences are timed out for E_D_TOV and R_A_TOV.
*
* Sequence event handling:
*
* The following events may occur on initiator sequences:
*
* Send.
* For now, the whole thing is sent.
* Receive ACK
* This applies only to class F.
* The sequence is marked complete.
* ULP completion.
* The upper layer calls fc_exch_done() when done
* with exchange and sequence tuple.
* RX-inferred completion.
* When we receive the next sequence on the same exchange, we can
* retire the previous sequence ID. (XXX not implemented).
* Timeout.
* R_A_TOV frees the sequence ID. If we're waiting for ACK,
* E_D_TOV causes abort and calls upper layer response handler
* with FC_EX_TIMEOUT error.
* Receive RJT
* XXX defer.
* Send ABTS
* On timeout.
*
* The following events may occur on recipient sequences:
*
* Receive
* Allocate sequence for first frame received.
* Hold during receive handler.
* Release when final frame received.
* Keep status of last N of these for the ELS RES command. XXX TBD.
* Receive ABTS
* Deallocate sequence
* Send RJT
* Deallocate
*
* For now, we neglect conditions where only part of a sequence was
* received or transmitted, or where out-of-order receipt is detected.
*/
/*
* Locking notes:
*
* The EM code run in a per-CPU worker thread.
*
* To protect against concurrency between a worker thread code and timers,
* sequence allocation and deallocation must be locked.
* - exchange refcnt can be done atomicly without locks.
* - sequence allocation must be locked by exch lock.
* - If the em_lock and ex_lock must be taken at the same time, then the
* em_lock must be taken before the ex_lock.
*/
/*
* opcode names for debugging.
*/
static char *fc_exch_rctl_names[] = FC_RCTL_NAMES_INIT;
#define FC_TABLE_SIZE(x) (sizeof(x) / sizeof(x[0]))
static inline const char *fc_exch_name_lookup(unsigned int op, char **table,
unsigned int max_index)
{
const char *name = NULL;
if (op < max_index)
name = table[op];
if (!name)
name = "unknown";
return name;
}
static const char *fc_exch_rctl_name(unsigned int op)
{
return fc_exch_name_lookup(op, fc_exch_rctl_names,
FC_TABLE_SIZE(fc_exch_rctl_names));
}
/*
* Hold an exchange - keep it from being freed.
*/
static void fc_exch_hold(struct fc_exch *ep)
{
atomic_inc(&ep->ex_refcnt);
}
/*
* setup fc hdr by initializing few more FC header fields and sof/eof.
* Initialized fields by this func:
* - fh_ox_id, fh_rx_id, fh_seq_id, fh_seq_cnt
* - sof and eof
*/
static void fc_exch_setup_hdr(struct fc_exch *ep, struct fc_frame *fp,
u32 f_ctl)
{
struct fc_frame_header *fh = fc_frame_header_get(fp);
u16 fill;
fr_sof(fp) = ep->class;
if (ep->seq.cnt)
fr_sof(fp) = fc_sof_normal(ep->class);
if (f_ctl & FC_FC_END_SEQ) {
fr_eof(fp) = FC_EOF_T;
if (fc_sof_needs_ack(ep->class))
fr_eof(fp) = FC_EOF_N;
/*
* Form f_ctl.
* The number of fill bytes to make the length a 4-byte
* multiple is the low order 2-bits of the f_ctl.
* The fill itself will have been cleared by the frame
* allocation.
* After this, the length will be even, as expected by
* the transport.
*/
fill = fr_len(fp) & 3;
if (fill) {
fill = 4 - fill;
/* TODO, this may be a problem with fragmented skb */
skb_put(fp_skb(fp), fill);
hton24(fh->fh_f_ctl, f_ctl | fill);
}
} else {
WARN_ON(fr_len(fp) % 4 != 0); /* no pad to non last frame */
fr_eof(fp) = FC_EOF_N;
}
/*
* Initialize remainig fh fields
* from fc_fill_fc_hdr
*/
fh->fh_ox_id = htons(ep->oxid);
fh->fh_rx_id = htons(ep->rxid);
fh->fh_seq_id = ep->seq.id;
fh->fh_seq_cnt = htons(ep->seq.cnt);
}
/*
* Release a reference to an exchange.
* If the refcnt goes to zero and the exchange is complete, it is freed.
*/
static void fc_exch_release(struct fc_exch *ep)
{
struct fc_exch_mgr *mp;
if (atomic_dec_and_test(&ep->ex_refcnt)) {
mp = ep->em;
if (ep->destructor)
ep->destructor(&ep->seq, ep->arg);
WARN_ON(!(ep->esb_stat & ESB_ST_COMPLETE));
mempool_free(ep, mp->ep_pool);
}
}
static int fc_exch_done_locked(struct fc_exch *ep)
{
int rc = 1;
/*
* We must check for completion in case there are two threads
* tyring to complete this. But the rrq code will reuse the
* ep, and in that case we only clear the resp and set it as
* complete, so it can be reused by the timer to send the rrq.
*/
ep->resp = NULL;
if (ep->state & FC_EX_DONE)
return rc;
ep->esb_stat |= ESB_ST_COMPLETE;
if (!(ep->esb_stat & ESB_ST_REC_QUAL)) {
ep->state |= FC_EX_DONE;
if (cancel_delayed_work(&ep->timeout_work))
atomic_dec(&ep->ex_refcnt); /* drop hold for timer */
rc = 0;
}
return rc;
}
static void fc_exch_mgr_delete_ep(struct fc_exch *ep)
{
struct fc_exch_mgr *mp;
mp = ep->em;
spin_lock_bh(&mp->em_lock);
WARN_ON(mp->total_exches <= 0);
mp->total_exches--;
mp->exches[ep->xid - mp->min_xid] = NULL;
list_del(&ep->ex_list);
spin_unlock_bh(&mp->em_lock);
fc_exch_release(ep); /* drop hold for exch in mp */
}
/*
* Internal version of fc_exch_timer_set - used with lock held.
*/
static inline void fc_exch_timer_set_locked(struct fc_exch *ep,
unsigned int timer_msec)
{
if (ep->state & (FC_EX_RST_CLEANUP | FC_EX_DONE))
return;
FC_EXCH_DBG(ep, "Exchange timed out, notifying the upper layer\n");
if (schedule_delayed_work(&ep->timeout_work,
msecs_to_jiffies(timer_msec)))
fc_exch_hold(ep); /* hold for timer */
}
/*
* Set timer for an exchange.
* The time is a minimum delay in milliseconds until the timer fires.
* Used for upper level protocols to time out the exchange.
* The timer is cancelled when it fires or when the exchange completes.
* Returns non-zero if a timer couldn't be allocated.
*/
static void fc_exch_timer_set(struct fc_exch *ep, unsigned int timer_msec)
{
spin_lock_bh(&ep->ex_lock);
fc_exch_timer_set_locked(ep, timer_msec);
spin_unlock_bh(&ep->ex_lock);
}
int fc_seq_exch_abort(const struct fc_seq *req_sp, unsigned int timer_msec)
{
struct fc_seq *sp;
struct fc_exch *ep;
struct fc_frame *fp;
int error;
ep = fc_seq_exch(req_sp);
spin_lock_bh(&ep->ex_lock);
if (ep->esb_stat & (ESB_ST_COMPLETE | ESB_ST_ABNORMAL) ||
ep->state & (FC_EX_DONE | FC_EX_RST_CLEANUP)) {
spin_unlock_bh(&ep->ex_lock);
return -ENXIO;
}
/*
* Send the abort on a new sequence if possible.
*/
sp = fc_seq_start_next_locked(&ep->seq);
if (!sp) {
spin_unlock_bh(&ep->ex_lock);
return -ENOMEM;
}
ep->esb_stat |= ESB_ST_SEQ_INIT | ESB_ST_ABNORMAL;
if (timer_msec)
fc_exch_timer_set_locked(ep, timer_msec);
spin_unlock_bh(&ep->ex_lock);
/*
* If not logged into the fabric, don't send ABTS but leave
* sequence active until next timeout.
*/
if (!ep->sid)
return 0;
/*
* Send an abort for the sequence that timed out.
*/
fp = fc_frame_alloc(ep->lp, 0);
if (fp) {
fc_fill_fc_hdr(fp, FC_RCTL_BA_ABTS, ep->did, ep->sid,
FC_TYPE_BLS, FC_FC_END_SEQ | FC_FC_SEQ_INIT, 0);
error = fc_seq_send(ep->lp, sp, fp);
} else
error = -ENOBUFS;
return error;
}
EXPORT_SYMBOL(fc_seq_exch_abort);
/*
* Exchange timeout - handle exchange timer expiration.
* The timer will have been cancelled before this is called.
*/
static void fc_exch_timeout(struct work_struct *work)
{
struct fc_exch *ep = container_of(work, struct fc_exch,
timeout_work.work);
struct fc_seq *sp = &ep->seq;
void (*resp)(struct fc_seq *, struct fc_frame *fp, void *arg);
void *arg;
u32 e_stat;
int rc = 1;
spin_lock_bh(&ep->ex_lock);
if (ep->state & (FC_EX_RST_CLEANUP | FC_EX_DONE))
goto unlock;
e_stat = ep->esb_stat;
if (e_stat & ESB_ST_COMPLETE) {
ep->esb_stat = e_stat & ~ESB_ST_REC_QUAL;
spin_unlock_bh(&ep->ex_lock);
if (e_stat & ESB_ST_REC_QUAL)
fc_exch_rrq(ep);
goto done;
} else {
resp = ep->resp;
arg = ep->arg;
ep->resp = NULL;
if (e_stat & ESB_ST_ABNORMAL)
rc = fc_exch_done_locked(ep);
spin_unlock_bh(&ep->ex_lock);
if (!rc)
fc_exch_mgr_delete_ep(ep);
if (resp)
resp(sp, ERR_PTR(-FC_EX_TIMEOUT), arg);
fc_seq_exch_abort(sp, 2 * ep->r_a_tov);
goto done;
}
unlock:
spin_unlock_bh(&ep->ex_lock);
done:
/*
* This release matches the hold taken when the timer was set.
*/
fc_exch_release(ep);
}
/*
* Allocate a sequence.
*
* We don't support multiple originated sequences on the same exchange.
* By implication, any previously originated sequence on this exchange
* is complete, and we reallocate the same sequence.
*/
static struct fc_seq *fc_seq_alloc(struct fc_exch *ep, u8 seq_id)
{
struct fc_seq *sp;
sp = &ep->seq;
sp->ssb_stat = 0;
sp->cnt = 0;
sp->id = seq_id;
return sp;
}
[SCSI] fcoe, fnic, libfc: modifies current code paths to use EM anchor list Modifies current code to use EM anchor list in EM allocation, EM free, EM reset, exch allocation and exch lookup code paths. 1. Modifies fc_exch_mgr_alloc to accept EM match function and then have allocated EM added to the lport using fc_exch_mgr_add API while also updating EM kref for newly added EM. 2. Updates fc_exch_mgr_free API to accept only lport pointer instead EM and then have this API free all EMs of the lport from EM anchor list. 3. Removes single lport pointer link from the EM, which was used in associating lport pointer in newly allocated exchange. Instead have lport pointer passed along new exchange allocation call path and then store passed lport pointer in newly allocated exchange, this will allow a single EM instance to be used across more than one lport and used in EM reset to reset only lport specific exchanges. 4. Modifies fc_exch_mgr_reset to reset all EMs from the EM anchor list of the lport, adds additional exch lport pointer (ep->lp) check for shared EM case to reset exchange specific to a lport requested reset. 5. Updates exch allocation API fc_exch_alloc to use EM anchor list and its anchor match func pointer. The fc_exch_alloc will walk the list of EMs until it finds a match, a match will be either null match func pointer or call to match function returning true value. 6. Updates fc_exch_recv to accept incoming frame on local port using only lport pointer and frame pointer without specifying EM instance of incoming frame. Instead modified fc_exch_recv to locate EM for the incoming frame by matching xid of incoming frame against a EM xid range. This change was required to use EM list in libfc Rx path and after this change the lport fc_exch_mgr pointer emp is not needed anymore, so removed emp pointer. 7. Updates fnic for removed lport emp pointer and above modified libfc APIs fc_exch_recv, fc_exch_mgr_alloc and fc_exch_mgr_free. 8. Removes exch_get and exch_put from libfc_function_template as these are no longer needed with EM anchor list and its match function use. Also removes its default function fc_exch_get. A defect this patch introduced regarding the libfc initialization order in the fnic driver was fixed by Joe Eykholt <jeykholt@cisco.com>. Signed-off-by: Vasu Dev <vasu.dev@intel.com> Signed-off-by: Robert Love <robert.w.love@intel.com> Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com> Signed-off-by: James Bottomley <James.Bottomley@suse.de>
2009-07-30 00:05:10 +00:00
/**
* fc_exch_em_alloc() - allocate an exchange from a specified EM.
* @lport: ptr to the local port
* @mp: ptr to the exchange manager
*
* Returns pointer to allocated fc_exch with exch lock held.
*/
[SCSI] fcoe, fnic, libfc: modifies current code paths to use EM anchor list Modifies current code to use EM anchor list in EM allocation, EM free, EM reset, exch allocation and exch lookup code paths. 1. Modifies fc_exch_mgr_alloc to accept EM match function and then have allocated EM added to the lport using fc_exch_mgr_add API while also updating EM kref for newly added EM. 2. Updates fc_exch_mgr_free API to accept only lport pointer instead EM and then have this API free all EMs of the lport from EM anchor list. 3. Removes single lport pointer link from the EM, which was used in associating lport pointer in newly allocated exchange. Instead have lport pointer passed along new exchange allocation call path and then store passed lport pointer in newly allocated exchange, this will allow a single EM instance to be used across more than one lport and used in EM reset to reset only lport specific exchanges. 4. Modifies fc_exch_mgr_reset to reset all EMs from the EM anchor list of the lport, adds additional exch lport pointer (ep->lp) check for shared EM case to reset exchange specific to a lport requested reset. 5. Updates exch allocation API fc_exch_alloc to use EM anchor list and its anchor match func pointer. The fc_exch_alloc will walk the list of EMs until it finds a match, a match will be either null match func pointer or call to match function returning true value. 6. Updates fc_exch_recv to accept incoming frame on local port using only lport pointer and frame pointer without specifying EM instance of incoming frame. Instead modified fc_exch_recv to locate EM for the incoming frame by matching xid of incoming frame against a EM xid range. This change was required to use EM list in libfc Rx path and after this change the lport fc_exch_mgr pointer emp is not needed anymore, so removed emp pointer. 7. Updates fnic for removed lport emp pointer and above modified libfc APIs fc_exch_recv, fc_exch_mgr_alloc and fc_exch_mgr_free. 8. Removes exch_get and exch_put from libfc_function_template as these are no longer needed with EM anchor list and its match function use. Also removes its default function fc_exch_get. A defect this patch introduced regarding the libfc initialization order in the fnic driver was fixed by Joe Eykholt <jeykholt@cisco.com>. Signed-off-by: Vasu Dev <vasu.dev@intel.com> Signed-off-by: Robert Love <robert.w.love@intel.com> Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com> Signed-off-by: James Bottomley <James.Bottomley@suse.de>
2009-07-30 00:05:10 +00:00
static struct fc_exch *fc_exch_em_alloc(struct fc_lport *lport,
struct fc_exch_mgr *mp)
{
struct fc_exch *ep;
u16 min, max, xid;
min = mp->min_xid;
max = mp->max_xid;
/* allocate memory for exchange */
ep = mempool_alloc(mp->ep_pool, GFP_ATOMIC);
if (!ep) {
atomic_inc(&mp->stats.no_free_exch);
goto out;
}
memset(ep, 0, sizeof(*ep));
spin_lock_bh(&mp->em_lock);
xid = mp->next_xid;
/* alloc a new xid */
while (mp->exches[xid - min]) {
xid = (xid == max) ? min : xid + 1;
if (xid == mp->next_xid)
goto err;
}
mp->next_xid = (xid == max) ? min : xid + 1;
fc_exch_hold(ep); /* hold for exch in mp */
spin_lock_init(&ep->ex_lock);
/*
* Hold exch lock for caller to prevent fc_exch_reset()
* from releasing exch while fc_exch_alloc() caller is
* still working on exch.
*/
spin_lock_bh(&ep->ex_lock);
mp->exches[xid - mp->min_xid] = ep;
list_add_tail(&ep->ex_list, &mp->ex_list);
fc_seq_alloc(ep, ep->seq_id++);
mp->total_exches++;
spin_unlock_bh(&mp->em_lock);
/*
* update exchange
*/
ep->oxid = ep->xid = xid;
ep->em = mp;
[SCSI] fcoe, fnic, libfc: modifies current code paths to use EM anchor list Modifies current code to use EM anchor list in EM allocation, EM free, EM reset, exch allocation and exch lookup code paths. 1. Modifies fc_exch_mgr_alloc to accept EM match function and then have allocated EM added to the lport using fc_exch_mgr_add API while also updating EM kref for newly added EM. 2. Updates fc_exch_mgr_free API to accept only lport pointer instead EM and then have this API free all EMs of the lport from EM anchor list. 3. Removes single lport pointer link from the EM, which was used in associating lport pointer in newly allocated exchange. Instead have lport pointer passed along new exchange allocation call path and then store passed lport pointer in newly allocated exchange, this will allow a single EM instance to be used across more than one lport and used in EM reset to reset only lport specific exchanges. 4. Modifies fc_exch_mgr_reset to reset all EMs from the EM anchor list of the lport, adds additional exch lport pointer (ep->lp) check for shared EM case to reset exchange specific to a lport requested reset. 5. Updates exch allocation API fc_exch_alloc to use EM anchor list and its anchor match func pointer. The fc_exch_alloc will walk the list of EMs until it finds a match, a match will be either null match func pointer or call to match function returning true value. 6. Updates fc_exch_recv to accept incoming frame on local port using only lport pointer and frame pointer without specifying EM instance of incoming frame. Instead modified fc_exch_recv to locate EM for the incoming frame by matching xid of incoming frame against a EM xid range. This change was required to use EM list in libfc Rx path and after this change the lport fc_exch_mgr pointer emp is not needed anymore, so removed emp pointer. 7. Updates fnic for removed lport emp pointer and above modified libfc APIs fc_exch_recv, fc_exch_mgr_alloc and fc_exch_mgr_free. 8. Removes exch_get and exch_put from libfc_function_template as these are no longer needed with EM anchor list and its match function use. Also removes its default function fc_exch_get. A defect this patch introduced regarding the libfc initialization order in the fnic driver was fixed by Joe Eykholt <jeykholt@cisco.com>. Signed-off-by: Vasu Dev <vasu.dev@intel.com> Signed-off-by: Robert Love <robert.w.love@intel.com> Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com> Signed-off-by: James Bottomley <James.Bottomley@suse.de>
2009-07-30 00:05:10 +00:00
ep->lp = lport;
ep->f_ctl = FC_FC_FIRST_SEQ; /* next seq is first seq */
ep->rxid = FC_XID_UNKNOWN;
ep->class = mp->class;
INIT_DELAYED_WORK(&ep->timeout_work, fc_exch_timeout);
out:
return ep;
err:
spin_unlock_bh(&mp->em_lock);
atomic_inc(&mp->stats.no_free_exch_xid);
mempool_free(ep, mp->ep_pool);
return NULL;
}
[SCSI] fcoe, fnic, libfc: modifies current code paths to use EM anchor list Modifies current code to use EM anchor list in EM allocation, EM free, EM reset, exch allocation and exch lookup code paths. 1. Modifies fc_exch_mgr_alloc to accept EM match function and then have allocated EM added to the lport using fc_exch_mgr_add API while also updating EM kref for newly added EM. 2. Updates fc_exch_mgr_free API to accept only lport pointer instead EM and then have this API free all EMs of the lport from EM anchor list. 3. Removes single lport pointer link from the EM, which was used in associating lport pointer in newly allocated exchange. Instead have lport pointer passed along new exchange allocation call path and then store passed lport pointer in newly allocated exchange, this will allow a single EM instance to be used across more than one lport and used in EM reset to reset only lport specific exchanges. 4. Modifies fc_exch_mgr_reset to reset all EMs from the EM anchor list of the lport, adds additional exch lport pointer (ep->lp) check for shared EM case to reset exchange specific to a lport requested reset. 5. Updates exch allocation API fc_exch_alloc to use EM anchor list and its anchor match func pointer. The fc_exch_alloc will walk the list of EMs until it finds a match, a match will be either null match func pointer or call to match function returning true value. 6. Updates fc_exch_recv to accept incoming frame on local port using only lport pointer and frame pointer without specifying EM instance of incoming frame. Instead modified fc_exch_recv to locate EM for the incoming frame by matching xid of incoming frame against a EM xid range. This change was required to use EM list in libfc Rx path and after this change the lport fc_exch_mgr pointer emp is not needed anymore, so removed emp pointer. 7. Updates fnic for removed lport emp pointer and above modified libfc APIs fc_exch_recv, fc_exch_mgr_alloc and fc_exch_mgr_free. 8. Removes exch_get and exch_put from libfc_function_template as these are no longer needed with EM anchor list and its match function use. Also removes its default function fc_exch_get. A defect this patch introduced regarding the libfc initialization order in the fnic driver was fixed by Joe Eykholt <jeykholt@cisco.com>. Signed-off-by: Vasu Dev <vasu.dev@intel.com> Signed-off-by: Robert Love <robert.w.love@intel.com> Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com> Signed-off-by: James Bottomley <James.Bottomley@suse.de>
2009-07-30 00:05:10 +00:00
/**
* fc_exch_alloc() - allocate an exchange.
* @lport: ptr to the local port
* @fp: ptr to the FC frame
*
* This function walks the list of the exchange manager(EM)
* anchors to select a EM for new exchange allocation. The
* EM is selected having either a NULL match function pointer
* or call to match function returning true.
*/
struct fc_exch *fc_exch_alloc(struct fc_lport *lport, struct fc_frame *fp)
{
struct fc_exch_mgr_anchor *ema;
struct fc_exch *ep;
list_for_each_entry(ema, &lport->ema_list, ema_list) {
if (!ema->match || ema->match(fp)) {
ep = fc_exch_em_alloc(lport, ema->mp);
[SCSI] fcoe, fnic, libfc: modifies current code paths to use EM anchor list Modifies current code to use EM anchor list in EM allocation, EM free, EM reset, exch allocation and exch lookup code paths. 1. Modifies fc_exch_mgr_alloc to accept EM match function and then have allocated EM added to the lport using fc_exch_mgr_add API while also updating EM kref for newly added EM. 2. Updates fc_exch_mgr_free API to accept only lport pointer instead EM and then have this API free all EMs of the lport from EM anchor list. 3. Removes single lport pointer link from the EM, which was used in associating lport pointer in newly allocated exchange. Instead have lport pointer passed along new exchange allocation call path and then store passed lport pointer in newly allocated exchange, this will allow a single EM instance to be used across more than one lport and used in EM reset to reset only lport specific exchanges. 4. Modifies fc_exch_mgr_reset to reset all EMs from the EM anchor list of the lport, adds additional exch lport pointer (ep->lp) check for shared EM case to reset exchange specific to a lport requested reset. 5. Updates exch allocation API fc_exch_alloc to use EM anchor list and its anchor match func pointer. The fc_exch_alloc will walk the list of EMs until it finds a match, a match will be either null match func pointer or call to match function returning true value. 6. Updates fc_exch_recv to accept incoming frame on local port using only lport pointer and frame pointer without specifying EM instance of incoming frame. Instead modified fc_exch_recv to locate EM for the incoming frame by matching xid of incoming frame against a EM xid range. This change was required to use EM list in libfc Rx path and after this change the lport fc_exch_mgr pointer emp is not needed anymore, so removed emp pointer. 7. Updates fnic for removed lport emp pointer and above modified libfc APIs fc_exch_recv, fc_exch_mgr_alloc and fc_exch_mgr_free. 8. Removes exch_get and exch_put from libfc_function_template as these are no longer needed with EM anchor list and its match function use. Also removes its default function fc_exch_get. A defect this patch introduced regarding the libfc initialization order in the fnic driver was fixed by Joe Eykholt <jeykholt@cisco.com>. Signed-off-by: Vasu Dev <vasu.dev@intel.com> Signed-off-by: Robert Love <robert.w.love@intel.com> Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com> Signed-off-by: James Bottomley <James.Bottomley@suse.de>
2009-07-30 00:05:10 +00:00
if (ep)
return ep;
}
}
return NULL;
}
EXPORT_SYMBOL(fc_exch_alloc);
/*
* Lookup and hold an exchange.
*/
static struct fc_exch *fc_exch_find(struct fc_exch_mgr *mp, u16 xid)
{
struct fc_exch *ep = NULL;
if ((xid >= mp->min_xid) && (xid <= mp->max_xid)) {
spin_lock_bh(&mp->em_lock);
ep = mp->exches[xid - mp->min_xid];
if (ep) {
fc_exch_hold(ep);
WARN_ON(ep->xid != xid);
}
spin_unlock_bh(&mp->em_lock);
}
return ep;
}
void fc_exch_done(struct fc_seq *sp)
{
struct fc_exch *ep = fc_seq_exch(sp);
int rc;
spin_lock_bh(&ep->ex_lock);
rc = fc_exch_done_locked(ep);
spin_unlock_bh(&ep->ex_lock);
if (!rc)
fc_exch_mgr_delete_ep(ep);
}
EXPORT_SYMBOL(fc_exch_done);
/*
* Allocate a new exchange as responder.
* Sets the responder ID in the frame header.
*/
[SCSI] fcoe, fnic, libfc: modifies current code paths to use EM anchor list Modifies current code to use EM anchor list in EM allocation, EM free, EM reset, exch allocation and exch lookup code paths. 1. Modifies fc_exch_mgr_alloc to accept EM match function and then have allocated EM added to the lport using fc_exch_mgr_add API while also updating EM kref for newly added EM. 2. Updates fc_exch_mgr_free API to accept only lport pointer instead EM and then have this API free all EMs of the lport from EM anchor list. 3. Removes single lport pointer link from the EM, which was used in associating lport pointer in newly allocated exchange. Instead have lport pointer passed along new exchange allocation call path and then store passed lport pointer in newly allocated exchange, this will allow a single EM instance to be used across more than one lport and used in EM reset to reset only lport specific exchanges. 4. Modifies fc_exch_mgr_reset to reset all EMs from the EM anchor list of the lport, adds additional exch lport pointer (ep->lp) check for shared EM case to reset exchange specific to a lport requested reset. 5. Updates exch allocation API fc_exch_alloc to use EM anchor list and its anchor match func pointer. The fc_exch_alloc will walk the list of EMs until it finds a match, a match will be either null match func pointer or call to match function returning true value. 6. Updates fc_exch_recv to accept incoming frame on local port using only lport pointer and frame pointer without specifying EM instance of incoming frame. Instead modified fc_exch_recv to locate EM for the incoming frame by matching xid of incoming frame against a EM xid range. This change was required to use EM list in libfc Rx path and after this change the lport fc_exch_mgr pointer emp is not needed anymore, so removed emp pointer. 7. Updates fnic for removed lport emp pointer and above modified libfc APIs fc_exch_recv, fc_exch_mgr_alloc and fc_exch_mgr_free. 8. Removes exch_get and exch_put from libfc_function_template as these are no longer needed with EM anchor list and its match function use. Also removes its default function fc_exch_get. A defect this patch introduced regarding the libfc initialization order in the fnic driver was fixed by Joe Eykholt <jeykholt@cisco.com>. Signed-off-by: Vasu Dev <vasu.dev@intel.com> Signed-off-by: Robert Love <robert.w.love@intel.com> Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com> Signed-off-by: James Bottomley <James.Bottomley@suse.de>
2009-07-30 00:05:10 +00:00
static struct fc_exch *fc_exch_resp(struct fc_lport *lport,
struct fc_exch_mgr *mp,
struct fc_frame *fp)
{
struct fc_exch *ep;
struct fc_frame_header *fh;
[SCSI] fcoe, fnic, libfc: modifies current code paths to use EM anchor list Modifies current code to use EM anchor list in EM allocation, EM free, EM reset, exch allocation and exch lookup code paths. 1. Modifies fc_exch_mgr_alloc to accept EM match function and then have allocated EM added to the lport using fc_exch_mgr_add API while also updating EM kref for newly added EM. 2. Updates fc_exch_mgr_free API to accept only lport pointer instead EM and then have this API free all EMs of the lport from EM anchor list. 3. Removes single lport pointer link from the EM, which was used in associating lport pointer in newly allocated exchange. Instead have lport pointer passed along new exchange allocation call path and then store passed lport pointer in newly allocated exchange, this will allow a single EM instance to be used across more than one lport and used in EM reset to reset only lport specific exchanges. 4. Modifies fc_exch_mgr_reset to reset all EMs from the EM anchor list of the lport, adds additional exch lport pointer (ep->lp) check for shared EM case to reset exchange specific to a lport requested reset. 5. Updates exch allocation API fc_exch_alloc to use EM anchor list and its anchor match func pointer. The fc_exch_alloc will walk the list of EMs until it finds a match, a match will be either null match func pointer or call to match function returning true value. 6. Updates fc_exch_recv to accept incoming frame on local port using only lport pointer and frame pointer without specifying EM instance of incoming frame. Instead modified fc_exch_recv to locate EM for the incoming frame by matching xid of incoming frame against a EM xid range. This change was required to use EM list in libfc Rx path and after this change the lport fc_exch_mgr pointer emp is not needed anymore, so removed emp pointer. 7. Updates fnic for removed lport emp pointer and above modified libfc APIs fc_exch_recv, fc_exch_mgr_alloc and fc_exch_mgr_free. 8. Removes exch_get and exch_put from libfc_function_template as these are no longer needed with EM anchor list and its match function use. Also removes its default function fc_exch_get. A defect this patch introduced regarding the libfc initialization order in the fnic driver was fixed by Joe Eykholt <jeykholt@cisco.com>. Signed-off-by: Vasu Dev <vasu.dev@intel.com> Signed-off-by: Robert Love <robert.w.love@intel.com> Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com> Signed-off-by: James Bottomley <James.Bottomley@suse.de>
2009-07-30 00:05:10 +00:00
ep = fc_exch_alloc(lport, fp);
if (ep) {
ep->class = fc_frame_class(fp);
/*
* Set EX_CTX indicating we're responding on this exchange.
*/
ep->f_ctl |= FC_FC_EX_CTX; /* we're responding */
ep->f_ctl &= ~FC_FC_FIRST_SEQ; /* not new */
fh = fc_frame_header_get(fp);
ep->sid = ntoh24(fh->fh_d_id);
ep->did = ntoh24(fh->fh_s_id);
ep->oid = ep->did;
/*
* Allocated exchange has placed the XID in the
* originator field. Move it to the responder field,
* and set the originator XID from the frame.
*/
ep->rxid = ep->xid;
ep->oxid = ntohs(fh->fh_ox_id);
ep->esb_stat |= ESB_ST_RESP | ESB_ST_SEQ_INIT;
if ((ntoh24(fh->fh_f_ctl) & FC_FC_SEQ_INIT) == 0)
ep->esb_stat &= ~ESB_ST_SEQ_INIT;
fc_exch_hold(ep); /* hold for caller */
[SCSI] fcoe, fnic, libfc: modifies current code paths to use EM anchor list Modifies current code to use EM anchor list in EM allocation, EM free, EM reset, exch allocation and exch lookup code paths. 1. Modifies fc_exch_mgr_alloc to accept EM match function and then have allocated EM added to the lport using fc_exch_mgr_add API while also updating EM kref for newly added EM. 2. Updates fc_exch_mgr_free API to accept only lport pointer instead EM and then have this API free all EMs of the lport from EM anchor list. 3. Removes single lport pointer link from the EM, which was used in associating lport pointer in newly allocated exchange. Instead have lport pointer passed along new exchange allocation call path and then store passed lport pointer in newly allocated exchange, this will allow a single EM instance to be used across more than one lport and used in EM reset to reset only lport specific exchanges. 4. Modifies fc_exch_mgr_reset to reset all EMs from the EM anchor list of the lport, adds additional exch lport pointer (ep->lp) check for shared EM case to reset exchange specific to a lport requested reset. 5. Updates exch allocation API fc_exch_alloc to use EM anchor list and its anchor match func pointer. The fc_exch_alloc will walk the list of EMs until it finds a match, a match will be either null match func pointer or call to match function returning true value. 6. Updates fc_exch_recv to accept incoming frame on local port using only lport pointer and frame pointer without specifying EM instance of incoming frame. Instead modified fc_exch_recv to locate EM for the incoming frame by matching xid of incoming frame against a EM xid range. This change was required to use EM list in libfc Rx path and after this change the lport fc_exch_mgr pointer emp is not needed anymore, so removed emp pointer. 7. Updates fnic for removed lport emp pointer and above modified libfc APIs fc_exch_recv, fc_exch_mgr_alloc and fc_exch_mgr_free. 8. Removes exch_get and exch_put from libfc_function_template as these are no longer needed with EM anchor list and its match function use. Also removes its default function fc_exch_get. A defect this patch introduced regarding the libfc initialization order in the fnic driver was fixed by Joe Eykholt <jeykholt@cisco.com>. Signed-off-by: Vasu Dev <vasu.dev@intel.com> Signed-off-by: Robert Love <robert.w.love@intel.com> Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com> Signed-off-by: James Bottomley <James.Bottomley@suse.de>
2009-07-30 00:05:10 +00:00
spin_unlock_bh(&ep->ex_lock); /* lock from fc_exch_alloc */
}
return ep;
}
/*
* Find a sequence for receive where the other end is originating the sequence.
* If fc_pf_rjt_reason is FC_RJT_NONE then this function will have a hold
* on the ep that should be released by the caller.
*/
[SCSI] fcoe, fnic, libfc: modifies current code paths to use EM anchor list Modifies current code to use EM anchor list in EM allocation, EM free, EM reset, exch allocation and exch lookup code paths. 1. Modifies fc_exch_mgr_alloc to accept EM match function and then have allocated EM added to the lport using fc_exch_mgr_add API while also updating EM kref for newly added EM. 2. Updates fc_exch_mgr_free API to accept only lport pointer instead EM and then have this API free all EMs of the lport from EM anchor list. 3. Removes single lport pointer link from the EM, which was used in associating lport pointer in newly allocated exchange. Instead have lport pointer passed along new exchange allocation call path and then store passed lport pointer in newly allocated exchange, this will allow a single EM instance to be used across more than one lport and used in EM reset to reset only lport specific exchanges. 4. Modifies fc_exch_mgr_reset to reset all EMs from the EM anchor list of the lport, adds additional exch lport pointer (ep->lp) check for shared EM case to reset exchange specific to a lport requested reset. 5. Updates exch allocation API fc_exch_alloc to use EM anchor list and its anchor match func pointer. The fc_exch_alloc will walk the list of EMs until it finds a match, a match will be either null match func pointer or call to match function returning true value. 6. Updates fc_exch_recv to accept incoming frame on local port using only lport pointer and frame pointer without specifying EM instance of incoming frame. Instead modified fc_exch_recv to locate EM for the incoming frame by matching xid of incoming frame against a EM xid range. This change was required to use EM list in libfc Rx path and after this change the lport fc_exch_mgr pointer emp is not needed anymore, so removed emp pointer. 7. Updates fnic for removed lport emp pointer and above modified libfc APIs fc_exch_recv, fc_exch_mgr_alloc and fc_exch_mgr_free. 8. Removes exch_get and exch_put from libfc_function_template as these are no longer needed with EM anchor list and its match function use. Also removes its default function fc_exch_get. A defect this patch introduced regarding the libfc initialization order in the fnic driver was fixed by Joe Eykholt <jeykholt@cisco.com>. Signed-off-by: Vasu Dev <vasu.dev@intel.com> Signed-off-by: Robert Love <robert.w.love@intel.com> Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com> Signed-off-by: James Bottomley <James.Bottomley@suse.de>
2009-07-30 00:05:10 +00:00
static enum fc_pf_rjt_reason fc_seq_lookup_recip(struct fc_lport *lport,
struct fc_exch_mgr *mp,
struct fc_frame *fp)
{
struct fc_frame_header *fh = fc_frame_header_get(fp);
struct fc_exch *ep = NULL;
struct fc_seq *sp = NULL;
enum fc_pf_rjt_reason reject = FC_RJT_NONE;
u32 f_ctl;
u16 xid;
f_ctl = ntoh24(fh->fh_f_ctl);
WARN_ON((f_ctl & FC_FC_SEQ_CTX) != 0);
/*
* Lookup or create the exchange if we will be creating the sequence.
*/
if (f_ctl & FC_FC_EX_CTX) {
xid = ntohs(fh->fh_ox_id); /* we originated exch */
ep = fc_exch_find(mp, xid);
if (!ep) {
atomic_inc(&mp->stats.xid_not_found);
reject = FC_RJT_OX_ID;
goto out;
}
if (ep->rxid == FC_XID_UNKNOWN)
ep->rxid = ntohs(fh->fh_rx_id);
else if (ep->rxid != ntohs(fh->fh_rx_id)) {
reject = FC_RJT_OX_ID;
goto rel;
}
} else {
xid = ntohs(fh->fh_rx_id); /* we are the responder */
/*
* Special case for MDS issuing an ELS TEST with a
* bad rxid of 0.
* XXX take this out once we do the proper reject.
*/
if (xid == 0 && fh->fh_r_ctl == FC_RCTL_ELS_REQ &&
fc_frame_payload_op(fp) == ELS_TEST) {
fh->fh_rx_id = htons(FC_XID_UNKNOWN);
xid = FC_XID_UNKNOWN;
}
/*
* new sequence - find the exchange
*/
ep = fc_exch_find(mp, xid);
if ((f_ctl & FC_FC_FIRST_SEQ) && fc_sof_is_init(fr_sof(fp))) {
if (ep) {
atomic_inc(&mp->stats.xid_busy);
reject = FC_RJT_RX_ID;
goto rel;
}
[SCSI] fcoe, fnic, libfc: modifies current code paths to use EM anchor list Modifies current code to use EM anchor list in EM allocation, EM free, EM reset, exch allocation and exch lookup code paths. 1. Modifies fc_exch_mgr_alloc to accept EM match function and then have allocated EM added to the lport using fc_exch_mgr_add API while also updating EM kref for newly added EM. 2. Updates fc_exch_mgr_free API to accept only lport pointer instead EM and then have this API free all EMs of the lport from EM anchor list. 3. Removes single lport pointer link from the EM, which was used in associating lport pointer in newly allocated exchange. Instead have lport pointer passed along new exchange allocation call path and then store passed lport pointer in newly allocated exchange, this will allow a single EM instance to be used across more than one lport and used in EM reset to reset only lport specific exchanges. 4. Modifies fc_exch_mgr_reset to reset all EMs from the EM anchor list of the lport, adds additional exch lport pointer (ep->lp) check for shared EM case to reset exchange specific to a lport requested reset. 5. Updates exch allocation API fc_exch_alloc to use EM anchor list and its anchor match func pointer. The fc_exch_alloc will walk the list of EMs until it finds a match, a match will be either null match func pointer or call to match function returning true value. 6. Updates fc_exch_recv to accept incoming frame on local port using only lport pointer and frame pointer without specifying EM instance of incoming frame. Instead modified fc_exch_recv to locate EM for the incoming frame by matching xid of incoming frame against a EM xid range. This change was required to use EM list in libfc Rx path and after this change the lport fc_exch_mgr pointer emp is not needed anymore, so removed emp pointer. 7. Updates fnic for removed lport emp pointer and above modified libfc APIs fc_exch_recv, fc_exch_mgr_alloc and fc_exch_mgr_free. 8. Removes exch_get and exch_put from libfc_function_template as these are no longer needed with EM anchor list and its match function use. Also removes its default function fc_exch_get. A defect this patch introduced regarding the libfc initialization order in the fnic driver was fixed by Joe Eykholt <jeykholt@cisco.com>. Signed-off-by: Vasu Dev <vasu.dev@intel.com> Signed-off-by: Robert Love <robert.w.love@intel.com> Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com> Signed-off-by: James Bottomley <James.Bottomley@suse.de>
2009-07-30 00:05:10 +00:00
ep = fc_exch_resp(lport, mp, fp);
if (!ep) {
reject = FC_RJT_EXCH_EST; /* XXX */
goto out;
}
xid = ep->xid; /* get our XID */
} else if (!ep) {
atomic_inc(&mp->stats.xid_not_found);
reject = FC_RJT_RX_ID; /* XID not found */
goto out;
}
}
/*
* At this point, we have the exchange held.
* Find or create the sequence.
*/
if (fc_sof_is_init(fr_sof(fp))) {
sp = fc_seq_start_next(&ep->seq);
if (!sp) {
reject = FC_RJT_SEQ_XS; /* exchange shortage */
goto rel;
}
sp->id = fh->fh_seq_id;
sp->ssb_stat |= SSB_ST_RESP;
} else {
sp = &ep->seq;
if (sp->id != fh->fh_seq_id) {
atomic_inc(&mp->stats.seq_not_found);
reject = FC_RJT_SEQ_ID; /* sequence/exch should exist */
goto rel;
}
}
WARN_ON(ep != fc_seq_exch(sp));
if (f_ctl & FC_FC_SEQ_INIT)
ep->esb_stat |= ESB_ST_SEQ_INIT;
fr_seq(fp) = sp;
out:
return reject;
rel:
fc_exch_done(&ep->seq);
fc_exch_release(ep); /* hold from fc_exch_find/fc_exch_resp */
return reject;
}
/*
* Find the sequence for a frame being received.
* We originated the sequence, so it should be found.
* We may or may not have originated the exchange.
* Does not hold the sequence for the caller.
*/
static struct fc_seq *fc_seq_lookup_orig(struct fc_exch_mgr *mp,
struct fc_frame *fp)
{
struct fc_frame_header *fh = fc_frame_header_get(fp);
struct fc_exch *ep;
struct fc_seq *sp = NULL;
u32 f_ctl;
u16 xid;
f_ctl = ntoh24(fh->fh_f_ctl);
WARN_ON((f_ctl & FC_FC_SEQ_CTX) != FC_FC_SEQ_CTX);
xid = ntohs((f_ctl & FC_FC_EX_CTX) ? fh->fh_ox_id : fh->fh_rx_id);
ep = fc_exch_find(mp, xid);
if (!ep)
return NULL;
if (ep->seq.id == fh->fh_seq_id) {
/*
* Save the RX_ID if we didn't previously know it.
*/
sp = &ep->seq;
if ((f_ctl & FC_FC_EX_CTX) != 0 &&
ep->rxid == FC_XID_UNKNOWN) {
ep->rxid = ntohs(fh->fh_rx_id);
}
}
fc_exch_release(ep);
return sp;
}
/*
* Set addresses for an exchange.
* Note this must be done before the first sequence of the exchange is sent.
*/
static void fc_exch_set_addr(struct fc_exch *ep,
u32 orig_id, u32 resp_id)
{
ep->oid = orig_id;
if (ep->esb_stat & ESB_ST_RESP) {
ep->sid = resp_id;
ep->did = orig_id;
} else {
ep->sid = orig_id;
ep->did = resp_id;
}
}
static struct fc_seq *fc_seq_start_next_locked(struct fc_seq *sp)
{
struct fc_exch *ep = fc_seq_exch(sp);
sp = fc_seq_alloc(ep, ep->seq_id++);
FC_EXCH_DBG(ep, "f_ctl %6x seq %2x\n",
ep->f_ctl, sp->id);
return sp;
}
/*
* Allocate a new sequence on the same exchange as the supplied sequence.
* This will never return NULL.
*/
struct fc_seq *fc_seq_start_next(struct fc_seq *sp)
{
struct fc_exch *ep = fc_seq_exch(sp);
spin_lock_bh(&ep->ex_lock);
sp = fc_seq_start_next_locked(sp);
spin_unlock_bh(&ep->ex_lock);
return sp;
}
EXPORT_SYMBOL(fc_seq_start_next);
int fc_seq_send(struct fc_lport *lp, struct fc_seq *sp, struct fc_frame *fp)
{
struct fc_exch *ep;
struct fc_frame_header *fh = fc_frame_header_get(fp);
int error;
u32 f_ctl;
ep = fc_seq_exch(sp);
WARN_ON((ep->esb_stat & ESB_ST_SEQ_INIT) != ESB_ST_SEQ_INIT);
f_ctl = ntoh24(fh->fh_f_ctl);
fc_exch_setup_hdr(ep, fp, f_ctl);
/*
* update sequence count if this frame is carrying
* multiple FC frames when sequence offload is enabled
* by LLD.
*/
if (fr_max_payload(fp))
sp->cnt += DIV_ROUND_UP((fr_len(fp) - sizeof(*fh)),
fr_max_payload(fp));
else
sp->cnt++;
/*
* Send the frame.
*/
error = lp->tt.frame_send(lp, fp);
/*
* Update the exchange and sequence flags,
* assuming all frames for the sequence have been sent.
* We can only be called to send once for each sequence.
*/
spin_lock_bh(&ep->ex_lock);
ep->f_ctl = f_ctl & ~FC_FC_FIRST_SEQ; /* not first seq */
if (f_ctl & (FC_FC_END_SEQ | FC_FC_SEQ_INIT))
ep->esb_stat &= ~ESB_ST_SEQ_INIT;
spin_unlock_bh(&ep->ex_lock);
return error;
}
EXPORT_SYMBOL(fc_seq_send);
void fc_seq_els_rsp_send(struct fc_seq *sp, enum fc_els_cmd els_cmd,
struct fc_seq_els_data *els_data)
{
switch (els_cmd) {
case ELS_LS_RJT:
fc_seq_ls_rjt(sp, els_data->reason, els_data->explan);
break;
case ELS_LS_ACC:
fc_seq_ls_acc(sp);
break;
case ELS_RRQ:
fc_exch_els_rrq(sp, els_data->fp);
break;
case ELS_REC:
fc_exch_els_rec(sp, els_data->fp);
break;
default:
FC_EXCH_DBG(fc_seq_exch(sp), "Invalid ELS CMD:%x\n", els_cmd);
}
}
EXPORT_SYMBOL(fc_seq_els_rsp_send);
/*
* Send a sequence, which is also the last sequence in the exchange.
*/
static void fc_seq_send_last(struct fc_seq *sp, struct fc_frame *fp,
enum fc_rctl rctl, enum fc_fh_type fh_type)
{
u32 f_ctl;
struct fc_exch *ep = fc_seq_exch(sp);
f_ctl = FC_FC_LAST_SEQ | FC_FC_END_SEQ | FC_FC_SEQ_INIT;
f_ctl |= ep->f_ctl;
fc_fill_fc_hdr(fp, rctl, ep->did, ep->sid, fh_type, f_ctl, 0);
fc_seq_send(ep->lp, sp, fp);
}
/*
* Send ACK_1 (or equiv.) indicating we received something.
* The frame we're acking is supplied.
*/
static void fc_seq_send_ack(struct fc_seq *sp, const struct fc_frame *rx_fp)
{
struct fc_frame *fp;
struct fc_frame_header *rx_fh;
struct fc_frame_header *fh;
struct fc_exch *ep = fc_seq_exch(sp);
struct fc_lport *lp = ep->lp;
unsigned int f_ctl;
/*
* Don't send ACKs for class 3.
*/
if (fc_sof_needs_ack(fr_sof(rx_fp))) {
fp = fc_frame_alloc(lp, 0);
if (!fp)
return;
fh = fc_frame_header_get(fp);
fh->fh_r_ctl = FC_RCTL_ACK_1;
fh->fh_type = FC_TYPE_BLS;
/*
* Form f_ctl by inverting EX_CTX and SEQ_CTX (bits 23, 22).
* Echo FIRST_SEQ, LAST_SEQ, END_SEQ, END_CONN, SEQ_INIT.
* Bits 9-8 are meaningful (retransmitted or unidirectional).
* Last ACK uses bits 7-6 (continue sequence),
* bits 5-4 are meaningful (what kind of ACK to use).
*/
rx_fh = fc_frame_header_get(rx_fp);
f_ctl = ntoh24(rx_fh->fh_f_ctl);
f_ctl &= FC_FC_EX_CTX | FC_FC_SEQ_CTX |
FC_FC_FIRST_SEQ | FC_FC_LAST_SEQ |
FC_FC_END_SEQ | FC_FC_END_CONN | FC_FC_SEQ_INIT |
FC_FC_RETX_SEQ | FC_FC_UNI_TX;
f_ctl ^= FC_FC_EX_CTX | FC_FC_SEQ_CTX;
hton24(fh->fh_f_ctl, f_ctl);
fc_exch_setup_hdr(ep, fp, f_ctl);
fh->fh_seq_id = rx_fh->fh_seq_id;
fh->fh_seq_cnt = rx_fh->fh_seq_cnt;
fh->fh_parm_offset = htonl(1); /* ack single frame */
fr_sof(fp) = fr_sof(rx_fp);
if (f_ctl & FC_FC_END_SEQ)
fr_eof(fp) = FC_EOF_T;
else
fr_eof(fp) = FC_EOF_N;
(void) lp->tt.frame_send(lp, fp);
}
}
/*
* Send BLS Reject.
* This is for rejecting BA_ABTS only.
*/
static void fc_exch_send_ba_rjt(struct fc_frame *rx_fp,
enum fc_ba_rjt_reason reason,
enum fc_ba_rjt_explan explan)
{
struct fc_frame *fp;
struct fc_frame_header *rx_fh;
struct fc_frame_header *fh;
struct fc_ba_rjt *rp;
struct fc_lport *lp;
unsigned int f_ctl;
lp = fr_dev(rx_fp);
fp = fc_frame_alloc(lp, sizeof(*rp));
if (!fp)
return;
fh = fc_frame_header_get(fp);
rx_fh = fc_frame_header_get(rx_fp);
memset(fh, 0, sizeof(*fh) + sizeof(*rp));
rp = fc_frame_payload_get(fp, sizeof(*rp));
rp->br_reason = reason;
rp->br_explan = explan;
/*
* seq_id, cs_ctl, df_ctl and param/offset are zero.
*/
memcpy(fh->fh_s_id, rx_fh->fh_d_id, 3);
memcpy(fh->fh_d_id, rx_fh->fh_s_id, 3);
fh->fh_ox_id = rx_fh->fh_rx_id;
fh->fh_rx_id = rx_fh->fh_ox_id;
fh->fh_seq_cnt = rx_fh->fh_seq_cnt;
fh->fh_r_ctl = FC_RCTL_BA_RJT;
fh->fh_type = FC_TYPE_BLS;
/*
* Form f_ctl by inverting EX_CTX and SEQ_CTX (bits 23, 22).
* Echo FIRST_SEQ, LAST_SEQ, END_SEQ, END_CONN, SEQ_INIT.
* Bits 9-8 are meaningful (retransmitted or unidirectional).
* Last ACK uses bits 7-6 (continue sequence),
* bits 5-4 are meaningful (what kind of ACK to use).
* Always set LAST_SEQ, END_SEQ.
*/
f_ctl = ntoh24(rx_fh->fh_f_ctl);
f_ctl &= FC_FC_EX_CTX | FC_FC_SEQ_CTX |
FC_FC_END_CONN | FC_FC_SEQ_INIT |
FC_FC_RETX_SEQ | FC_FC_UNI_TX;
f_ctl ^= FC_FC_EX_CTX | FC_FC_SEQ_CTX;
f_ctl |= FC_FC_LAST_SEQ | FC_FC_END_SEQ;
f_ctl &= ~FC_FC_FIRST_SEQ;
hton24(fh->fh_f_ctl, f_ctl);
fr_sof(fp) = fc_sof_class(fr_sof(rx_fp));
fr_eof(fp) = FC_EOF_T;
if (fc_sof_needs_ack(fr_sof(fp)))
fr_eof(fp) = FC_EOF_N;
(void) lp->tt.frame_send(lp, fp);
}
/*
* Handle an incoming ABTS. This would be for target mode usually,
* but could be due to lost FCP transfer ready, confirm or RRQ.
* We always handle this as an exchange abort, ignoring the parameter.
*/
static void fc_exch_recv_abts(struct fc_exch *ep, struct fc_frame *rx_fp)
{
struct fc_frame *fp;
struct fc_ba_acc *ap;
struct fc_frame_header *fh;
struct fc_seq *sp;
if (!ep)
goto reject;
spin_lock_bh(&ep->ex_lock);
if (ep->esb_stat & ESB_ST_COMPLETE) {
spin_unlock_bh(&ep->ex_lock);
goto reject;
}
if (!(ep->esb_stat & ESB_ST_REC_QUAL))
fc_exch_hold(ep); /* hold for REC_QUAL */
ep->esb_stat |= ESB_ST_ABNORMAL | ESB_ST_REC_QUAL;
fc_exch_timer_set_locked(ep, ep->r_a_tov);
fp = fc_frame_alloc(ep->lp, sizeof(*ap));
if (!fp) {
spin_unlock_bh(&ep->ex_lock);
goto free;
}
fh = fc_frame_header_get(fp);
ap = fc_frame_payload_get(fp, sizeof(*ap));
memset(ap, 0, sizeof(*ap));
sp = &ep->seq;
ap->ba_high_seq_cnt = htons(0xffff);
if (sp->ssb_stat & SSB_ST_RESP) {
ap->ba_seq_id = sp->id;
ap->ba_seq_id_val = FC_BA_SEQ_ID_VAL;
ap->ba_high_seq_cnt = fh->fh_seq_cnt;
ap->ba_low_seq_cnt = htons(sp->cnt);
}
sp = fc_seq_start_next_locked(sp);
spin_unlock_bh(&ep->ex_lock);
fc_seq_send_last(sp, fp, FC_RCTL_BA_ACC, FC_TYPE_BLS);
fc_frame_free(rx_fp);
return;
reject:
fc_exch_send_ba_rjt(rx_fp, FC_BA_RJT_UNABLE, FC_BA_RJT_INV_XID);
free:
fc_frame_free(rx_fp);
}
/*
* Handle receive where the other end is originating the sequence.
*/
static void fc_exch_recv_req(struct fc_lport *lp, struct fc_exch_mgr *mp,
struct fc_frame *fp)
{
struct fc_frame_header *fh = fc_frame_header_get(fp);
struct fc_seq *sp = NULL;
struct fc_exch *ep = NULL;
enum fc_sof sof;
enum fc_eof eof;
u32 f_ctl;
enum fc_pf_rjt_reason reject;
fr_seq(fp) = NULL;
[SCSI] fcoe, fnic, libfc: modifies current code paths to use EM anchor list Modifies current code to use EM anchor list in EM allocation, EM free, EM reset, exch allocation and exch lookup code paths. 1. Modifies fc_exch_mgr_alloc to accept EM match function and then have allocated EM added to the lport using fc_exch_mgr_add API while also updating EM kref for newly added EM. 2. Updates fc_exch_mgr_free API to accept only lport pointer instead EM and then have this API free all EMs of the lport from EM anchor list. 3. Removes single lport pointer link from the EM, which was used in associating lport pointer in newly allocated exchange. Instead have lport pointer passed along new exchange allocation call path and then store passed lport pointer in newly allocated exchange, this will allow a single EM instance to be used across more than one lport and used in EM reset to reset only lport specific exchanges. 4. Modifies fc_exch_mgr_reset to reset all EMs from the EM anchor list of the lport, adds additional exch lport pointer (ep->lp) check for shared EM case to reset exchange specific to a lport requested reset. 5. Updates exch allocation API fc_exch_alloc to use EM anchor list and its anchor match func pointer. The fc_exch_alloc will walk the list of EMs until it finds a match, a match will be either null match func pointer or call to match function returning true value. 6. Updates fc_exch_recv to accept incoming frame on local port using only lport pointer and frame pointer without specifying EM instance of incoming frame. Instead modified fc_exch_recv to locate EM for the incoming frame by matching xid of incoming frame against a EM xid range. This change was required to use EM list in libfc Rx path and after this change the lport fc_exch_mgr pointer emp is not needed anymore, so removed emp pointer. 7. Updates fnic for removed lport emp pointer and above modified libfc APIs fc_exch_recv, fc_exch_mgr_alloc and fc_exch_mgr_free. 8. Removes exch_get and exch_put from libfc_function_template as these are no longer needed with EM anchor list and its match function use. Also removes its default function fc_exch_get. A defect this patch introduced regarding the libfc initialization order in the fnic driver was fixed by Joe Eykholt <jeykholt@cisco.com>. Signed-off-by: Vasu Dev <vasu.dev@intel.com> Signed-off-by: Robert Love <robert.w.love@intel.com> Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com> Signed-off-by: James Bottomley <James.Bottomley@suse.de>
2009-07-30 00:05:10 +00:00
reject = fc_seq_lookup_recip(lp, mp, fp);
if (reject == FC_RJT_NONE) {
sp = fr_seq(fp); /* sequence will be held */
ep = fc_seq_exch(sp);
sof = fr_sof(fp);
eof = fr_eof(fp);
f_ctl = ntoh24(fh->fh_f_ctl);
fc_seq_send_ack(sp, fp);
/*
* Call the receive function.
*
* The receive function may allocate a new sequence
* over the old one, so we shouldn't change the
* sequence after this.
*
* The frame will be freed by the receive function.
* If new exch resp handler is valid then call that
* first.
*/
if (ep->resp)
ep->resp(sp, fp, ep->arg);
else
lp->tt.lport_recv(lp, sp, fp);
fc_exch_release(ep); /* release from lookup */
} else {
FC_LPORT_DBG(lp, "exch/seq lookup failed: reject %x\n", reject);
fc_frame_free(fp);
}
}
/*
* Handle receive where the other end is originating the sequence in
* response to our exchange.
*/
static void fc_exch_recv_seq_resp(struct fc_exch_mgr *mp, struct fc_frame *fp)
{
struct fc_frame_header *fh = fc_frame_header_get(fp);
struct fc_seq *sp;
struct fc_exch *ep;
enum fc_sof sof;
u32 f_ctl;
void (*resp)(struct fc_seq *, struct fc_frame *fp, void *arg);
void *ex_resp_arg;
int rc;
ep = fc_exch_find(mp, ntohs(fh->fh_ox_id));
if (!ep) {
atomic_inc(&mp->stats.xid_not_found);
goto out;
}
if (ep->esb_stat & ESB_ST_COMPLETE) {
atomic_inc(&mp->stats.xid_not_found);
goto out;
}
if (ep->rxid == FC_XID_UNKNOWN)
ep->rxid = ntohs(fh->fh_rx_id);
if (ep->sid != 0 && ep->sid != ntoh24(fh->fh_d_id)) {
atomic_inc(&mp->stats.xid_not_found);
goto rel;
}
if (ep->did != ntoh24(fh->fh_s_id) &&
ep->did != FC_FID_FLOGI) {
atomic_inc(&mp->stats.xid_not_found);
goto rel;
}
sof = fr_sof(fp);
if (fc_sof_is_init(sof)) {
sp = fc_seq_start_next(&ep->seq);
sp->id = fh->fh_seq_id;
sp->ssb_stat |= SSB_ST_RESP;
} else {
sp = &ep->seq;
if (sp->id != fh->fh_seq_id) {
atomic_inc(&mp->stats.seq_not_found);
goto rel;
}
}
f_ctl = ntoh24(fh->fh_f_ctl);
fr_seq(fp) = sp;
if (f_ctl & FC_FC_SEQ_INIT)
ep->esb_stat |= ESB_ST_SEQ_INIT;
if (fc_sof_needs_ack(sof))
fc_seq_send_ack(sp, fp);
resp = ep->resp;
ex_resp_arg = ep->arg;
if (fh->fh_type != FC_TYPE_FCP && fr_eof(fp) == FC_EOF_T &&
(f_ctl & (FC_FC_LAST_SEQ | FC_FC_END_SEQ)) ==
(FC_FC_LAST_SEQ | FC_FC_END_SEQ)) {
spin_lock_bh(&ep->ex_lock);
rc = fc_exch_done_locked(ep);
WARN_ON(fc_seq_exch(sp) != ep);
spin_unlock_bh(&ep->ex_lock);
if (!rc)
fc_exch_mgr_delete_ep(ep);
}
/*
* Call the receive function.
* The sequence is held (has a refcnt) for us,
* but not for the receive function.
*
* The receive function may allocate a new sequence
* over the old one, so we shouldn't change the
* sequence after this.
*
* The frame will be freed by the receive function.
* If new exch resp handler is valid then call that
* first.
*/
if (resp)
resp(sp, fp, ex_resp_arg);
else
fc_frame_free(fp);
fc_exch_release(ep);
return;
rel:
fc_exch_release(ep);
out:
fc_frame_free(fp);
}
/*
* Handle receive for a sequence where other end is responding to our sequence.
*/
static void fc_exch_recv_resp(struct fc_exch_mgr *mp, struct fc_frame *fp)
{
struct fc_seq *sp;
sp = fc_seq_lookup_orig(mp, fp); /* doesn't hold sequence */
if (!sp)
atomic_inc(&mp->stats.xid_not_found);
else
atomic_inc(&mp->stats.non_bls_resp);
fc_frame_free(fp);
}
/*
* Handle the response to an ABTS for exchange or sequence.
* This can be BA_ACC or BA_RJT.
*/
static void fc_exch_abts_resp(struct fc_exch *ep, struct fc_frame *fp)
{
void (*resp)(struct fc_seq *, struct fc_frame *fp, void *arg);
void *ex_resp_arg;
struct fc_frame_header *fh;
struct fc_ba_acc *ap;
struct fc_seq *sp;
u16 low;
u16 high;
int rc = 1, has_rec = 0;
fh = fc_frame_header_get(fp);
FC_EXCH_DBG(ep, "exch: BLS rctl %x - %s\n", fh->fh_r_ctl,
fc_exch_rctl_name(fh->fh_r_ctl));
if (cancel_delayed_work_sync(&ep->timeout_work))
fc_exch_release(ep); /* release from pending timer hold */
spin_lock_bh(&ep->ex_lock);
switch (fh->fh_r_ctl) {
case FC_RCTL_BA_ACC:
ap = fc_frame_payload_get(fp, sizeof(*ap));
if (!ap)
break;
/*
* Decide whether to establish a Recovery Qualifier.
* We do this if there is a non-empty SEQ_CNT range and
* SEQ_ID is the same as the one we aborted.
*/
low = ntohs(ap->ba_low_seq_cnt);
high = ntohs(ap->ba_high_seq_cnt);
if ((ep->esb_stat & ESB_ST_REC_QUAL) == 0 &&
(ap->ba_seq_id_val != FC_BA_SEQ_ID_VAL ||
ap->ba_seq_id == ep->seq_id) && low != high) {
ep->esb_stat |= ESB_ST_REC_QUAL;
fc_exch_hold(ep); /* hold for recovery qualifier */
has_rec = 1;
}
break;
case FC_RCTL_BA_RJT:
break;
default:
break;
}
resp = ep->resp;
ex_resp_arg = ep->arg;
/* do we need to do some other checks here. Can we reuse more of
* fc_exch_recv_seq_resp
*/
sp = &ep->seq;
/*
* do we want to check END_SEQ as well as LAST_SEQ here?
*/
if (ep->fh_type != FC_TYPE_FCP &&
ntoh24(fh->fh_f_ctl) & FC_FC_LAST_SEQ)
rc = fc_exch_done_locked(ep);
spin_unlock_bh(&ep->ex_lock);
if (!rc)
fc_exch_mgr_delete_ep(ep);
if (resp)
resp(sp, fp, ex_resp_arg);
else
fc_frame_free(fp);
if (has_rec)
fc_exch_timer_set(ep, ep->r_a_tov);
}
/*
* Receive BLS sequence.
* This is always a sequence initiated by the remote side.
* We may be either the originator or recipient of the exchange.
*/
static void fc_exch_recv_bls(struct fc_exch_mgr *mp, struct fc_frame *fp)
{
struct fc_frame_header *fh;
struct fc_exch *ep;
u32 f_ctl;
fh = fc_frame_header_get(fp);
f_ctl = ntoh24(fh->fh_f_ctl);
fr_seq(fp) = NULL;
ep = fc_exch_find(mp, (f_ctl & FC_FC_EX_CTX) ?
ntohs(fh->fh_ox_id) : ntohs(fh->fh_rx_id));
if (ep && (f_ctl & FC_FC_SEQ_INIT)) {
spin_lock_bh(&ep->ex_lock);
ep->esb_stat |= ESB_ST_SEQ_INIT;
spin_unlock_bh(&ep->ex_lock);
}
if (f_ctl & FC_FC_SEQ_CTX) {
/*
* A response to a sequence we initiated.
* This should only be ACKs for class 2 or F.
*/
switch (fh->fh_r_ctl) {
case FC_RCTL_ACK_1:
case FC_RCTL_ACK_0:
break;
default:
FC_EXCH_DBG(ep, "BLS rctl %x - %s received",
fh->fh_r_ctl,
fc_exch_rctl_name(fh->fh_r_ctl));
break;
}
fc_frame_free(fp);
} else {
switch (fh->fh_r_ctl) {
case FC_RCTL_BA_RJT:
case FC_RCTL_BA_ACC:
if (ep)
fc_exch_abts_resp(ep, fp);
else
fc_frame_free(fp);
break;
case FC_RCTL_BA_ABTS:
fc_exch_recv_abts(ep, fp);
break;
default: /* ignore junk */
fc_frame_free(fp);
break;
}
}
if (ep)
fc_exch_release(ep); /* release hold taken by fc_exch_find */
}
/*
* Accept sequence with LS_ACC.
* If this fails due to allocation or transmit congestion, assume the
* originator will repeat the sequence.
*/
static void fc_seq_ls_acc(struct fc_seq *req_sp)
{
struct fc_seq *sp;
struct fc_els_ls_acc *acc;
struct fc_frame *fp;
sp = fc_seq_start_next(req_sp);
fp = fc_frame_alloc(fc_seq_exch(sp)->lp, sizeof(*acc));
if (fp) {
acc = fc_frame_payload_get(fp, sizeof(*acc));
memset(acc, 0, sizeof(*acc));
acc->la_cmd = ELS_LS_ACC;
fc_seq_send_last(sp, fp, FC_RCTL_ELS_REP, FC_TYPE_ELS);
}
}
/*
* Reject sequence with ELS LS_RJT.
* If this fails due to allocation or transmit congestion, assume the
* originator will repeat the sequence.
*/
static void fc_seq_ls_rjt(struct fc_seq *req_sp, enum fc_els_rjt_reason reason,
enum fc_els_rjt_explan explan)
{
struct fc_seq *sp;
struct fc_els_ls_rjt *rjt;
struct fc_frame *fp;
sp = fc_seq_start_next(req_sp);
fp = fc_frame_alloc(fc_seq_exch(sp)->lp, sizeof(*rjt));
if (fp) {
rjt = fc_frame_payload_get(fp, sizeof(*rjt));
memset(rjt, 0, sizeof(*rjt));
rjt->er_cmd = ELS_LS_RJT;
rjt->er_reason = reason;
rjt->er_explan = explan;
fc_seq_send_last(sp, fp, FC_RCTL_ELS_REP, FC_TYPE_ELS);
}
}
static void fc_exch_reset(struct fc_exch *ep)
{
struct fc_seq *sp;
void (*resp)(struct fc_seq *, struct fc_frame *, void *);
void *arg;
int rc = 1;
spin_lock_bh(&ep->ex_lock);
ep->state |= FC_EX_RST_CLEANUP;
/*
* we really want to call del_timer_sync, but cannot due
* to the lport calling with the lport lock held (some resp
* functions can also grab the lport lock which could cause
* a deadlock).
*/
if (cancel_delayed_work(&ep->timeout_work))
atomic_dec(&ep->ex_refcnt); /* drop hold for timer */
resp = ep->resp;
ep->resp = NULL;
if (ep->esb_stat & ESB_ST_REC_QUAL)
atomic_dec(&ep->ex_refcnt); /* drop hold for rec_qual */
ep->esb_stat &= ~ESB_ST_REC_QUAL;
arg = ep->arg;
sp = &ep->seq;
rc = fc_exch_done_locked(ep);
spin_unlock_bh(&ep->ex_lock);
if (!rc)
fc_exch_mgr_delete_ep(ep);
if (resp)
resp(sp, ERR_PTR(-FC_EX_CLOSED), arg);
}
/*
* Reset an exchange manager, releasing all sequences and exchanges.
* If sid is non-zero, reset only exchanges we source from that FID.
* If did is non-zero, reset only exchanges destined to that FID.
*/
void fc_exch_mgr_reset(struct fc_lport *lp, u32 sid, u32 did)
{
struct fc_exch *ep;
struct fc_exch *next;
[SCSI] fcoe, fnic, libfc: modifies current code paths to use EM anchor list Modifies current code to use EM anchor list in EM allocation, EM free, EM reset, exch allocation and exch lookup code paths. 1. Modifies fc_exch_mgr_alloc to accept EM match function and then have allocated EM added to the lport using fc_exch_mgr_add API while also updating EM kref for newly added EM. 2. Updates fc_exch_mgr_free API to accept only lport pointer instead EM and then have this API free all EMs of the lport from EM anchor list. 3. Removes single lport pointer link from the EM, which was used in associating lport pointer in newly allocated exchange. Instead have lport pointer passed along new exchange allocation call path and then store passed lport pointer in newly allocated exchange, this will allow a single EM instance to be used across more than one lport and used in EM reset to reset only lport specific exchanges. 4. Modifies fc_exch_mgr_reset to reset all EMs from the EM anchor list of the lport, adds additional exch lport pointer (ep->lp) check for shared EM case to reset exchange specific to a lport requested reset. 5. Updates exch allocation API fc_exch_alloc to use EM anchor list and its anchor match func pointer. The fc_exch_alloc will walk the list of EMs until it finds a match, a match will be either null match func pointer or call to match function returning true value. 6. Updates fc_exch_recv to accept incoming frame on local port using only lport pointer and frame pointer without specifying EM instance of incoming frame. Instead modified fc_exch_recv to locate EM for the incoming frame by matching xid of incoming frame against a EM xid range. This change was required to use EM list in libfc Rx path and after this change the lport fc_exch_mgr pointer emp is not needed anymore, so removed emp pointer. 7. Updates fnic for removed lport emp pointer and above modified libfc APIs fc_exch_recv, fc_exch_mgr_alloc and fc_exch_mgr_free. 8. Removes exch_get and exch_put from libfc_function_template as these are no longer needed with EM anchor list and its match function use. Also removes its default function fc_exch_get. A defect this patch introduced regarding the libfc initialization order in the fnic driver was fixed by Joe Eykholt <jeykholt@cisco.com>. Signed-off-by: Vasu Dev <vasu.dev@intel.com> Signed-off-by: Robert Love <robert.w.love@intel.com> Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com> Signed-off-by: James Bottomley <James.Bottomley@suse.de>
2009-07-30 00:05:10 +00:00
struct fc_exch_mgr *mp;
struct fc_exch_mgr_anchor *ema;
[SCSI] fcoe, fnic, libfc: modifies current code paths to use EM anchor list Modifies current code to use EM anchor list in EM allocation, EM free, EM reset, exch allocation and exch lookup code paths. 1. Modifies fc_exch_mgr_alloc to accept EM match function and then have allocated EM added to the lport using fc_exch_mgr_add API while also updating EM kref for newly added EM. 2. Updates fc_exch_mgr_free API to accept only lport pointer instead EM and then have this API free all EMs of the lport from EM anchor list. 3. Removes single lport pointer link from the EM, which was used in associating lport pointer in newly allocated exchange. Instead have lport pointer passed along new exchange allocation call path and then store passed lport pointer in newly allocated exchange, this will allow a single EM instance to be used across more than one lport and used in EM reset to reset only lport specific exchanges. 4. Modifies fc_exch_mgr_reset to reset all EMs from the EM anchor list of the lport, adds additional exch lport pointer (ep->lp) check for shared EM case to reset exchange specific to a lport requested reset. 5. Updates exch allocation API fc_exch_alloc to use EM anchor list and its anchor match func pointer. The fc_exch_alloc will walk the list of EMs until it finds a match, a match will be either null match func pointer or call to match function returning true value. 6. Updates fc_exch_recv to accept incoming frame on local port using only lport pointer and frame pointer without specifying EM instance of incoming frame. Instead modified fc_exch_recv to locate EM for the incoming frame by matching xid of incoming frame against a EM xid range. This change was required to use EM list in libfc Rx path and after this change the lport fc_exch_mgr pointer emp is not needed anymore, so removed emp pointer. 7. Updates fnic for removed lport emp pointer and above modified libfc APIs fc_exch_recv, fc_exch_mgr_alloc and fc_exch_mgr_free. 8. Removes exch_get and exch_put from libfc_function_template as these are no longer needed with EM anchor list and its match function use. Also removes its default function fc_exch_get. A defect this patch introduced regarding the libfc initialization order in the fnic driver was fixed by Joe Eykholt <jeykholt@cisco.com>. Signed-off-by: Vasu Dev <vasu.dev@intel.com> Signed-off-by: Robert Love <robert.w.love@intel.com> Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com> Signed-off-by: James Bottomley <James.Bottomley@suse.de>
2009-07-30 00:05:10 +00:00
list_for_each_entry(ema, &lp->ema_list, ema_list) {
mp = ema->mp;
spin_lock_bh(&mp->em_lock);
restart:
[SCSI] fcoe, fnic, libfc: modifies current code paths to use EM anchor list Modifies current code to use EM anchor list in EM allocation, EM free, EM reset, exch allocation and exch lookup code paths. 1. Modifies fc_exch_mgr_alloc to accept EM match function and then have allocated EM added to the lport using fc_exch_mgr_add API while also updating EM kref for newly added EM. 2. Updates fc_exch_mgr_free API to accept only lport pointer instead EM and then have this API free all EMs of the lport from EM anchor list. 3. Removes single lport pointer link from the EM, which was used in associating lport pointer in newly allocated exchange. Instead have lport pointer passed along new exchange allocation call path and then store passed lport pointer in newly allocated exchange, this will allow a single EM instance to be used across more than one lport and used in EM reset to reset only lport specific exchanges. 4. Modifies fc_exch_mgr_reset to reset all EMs from the EM anchor list of the lport, adds additional exch lport pointer (ep->lp) check for shared EM case to reset exchange specific to a lport requested reset. 5. Updates exch allocation API fc_exch_alloc to use EM anchor list and its anchor match func pointer. The fc_exch_alloc will walk the list of EMs until it finds a match, a match will be either null match func pointer or call to match function returning true value. 6. Updates fc_exch_recv to accept incoming frame on local port using only lport pointer and frame pointer without specifying EM instance of incoming frame. Instead modified fc_exch_recv to locate EM for the incoming frame by matching xid of incoming frame against a EM xid range. This change was required to use EM list in libfc Rx path and after this change the lport fc_exch_mgr pointer emp is not needed anymore, so removed emp pointer. 7. Updates fnic for removed lport emp pointer and above modified libfc APIs fc_exch_recv, fc_exch_mgr_alloc and fc_exch_mgr_free. 8. Removes exch_get and exch_put from libfc_function_template as these are no longer needed with EM anchor list and its match function use. Also removes its default function fc_exch_get. A defect this patch introduced regarding the libfc initialization order in the fnic driver was fixed by Joe Eykholt <jeykholt@cisco.com>. Signed-off-by: Vasu Dev <vasu.dev@intel.com> Signed-off-by: Robert Love <robert.w.love@intel.com> Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com> Signed-off-by: James Bottomley <James.Bottomley@suse.de>
2009-07-30 00:05:10 +00:00
list_for_each_entry_safe(ep, next, &mp->ex_list, ex_list) {
if ((lp == ep->lp) &&
(sid == 0 || sid == ep->sid) &&
(did == 0 || did == ep->did)) {
fc_exch_hold(ep);
spin_unlock_bh(&mp->em_lock);
fc_exch_reset(ep);
fc_exch_release(ep);
spin_lock_bh(&mp->em_lock);
/*
* must restart loop incase while lock
* was down multiple eps were released.
*/
goto restart;
}
}
[SCSI] fcoe, fnic, libfc: modifies current code paths to use EM anchor list Modifies current code to use EM anchor list in EM allocation, EM free, EM reset, exch allocation and exch lookup code paths. 1. Modifies fc_exch_mgr_alloc to accept EM match function and then have allocated EM added to the lport using fc_exch_mgr_add API while also updating EM kref for newly added EM. 2. Updates fc_exch_mgr_free API to accept only lport pointer instead EM and then have this API free all EMs of the lport from EM anchor list. 3. Removes single lport pointer link from the EM, which was used in associating lport pointer in newly allocated exchange. Instead have lport pointer passed along new exchange allocation call path and then store passed lport pointer in newly allocated exchange, this will allow a single EM instance to be used across more than one lport and used in EM reset to reset only lport specific exchanges. 4. Modifies fc_exch_mgr_reset to reset all EMs from the EM anchor list of the lport, adds additional exch lport pointer (ep->lp) check for shared EM case to reset exchange specific to a lport requested reset. 5. Updates exch allocation API fc_exch_alloc to use EM anchor list and its anchor match func pointer. The fc_exch_alloc will walk the list of EMs until it finds a match, a match will be either null match func pointer or call to match function returning true value. 6. Updates fc_exch_recv to accept incoming frame on local port using only lport pointer and frame pointer without specifying EM instance of incoming frame. Instead modified fc_exch_recv to locate EM for the incoming frame by matching xid of incoming frame against a EM xid range. This change was required to use EM list in libfc Rx path and after this change the lport fc_exch_mgr pointer emp is not needed anymore, so removed emp pointer. 7. Updates fnic for removed lport emp pointer and above modified libfc APIs fc_exch_recv, fc_exch_mgr_alloc and fc_exch_mgr_free. 8. Removes exch_get and exch_put from libfc_function_template as these are no longer needed with EM anchor list and its match function use. Also removes its default function fc_exch_get. A defect this patch introduced regarding the libfc initialization order in the fnic driver was fixed by Joe Eykholt <jeykholt@cisco.com>. Signed-off-by: Vasu Dev <vasu.dev@intel.com> Signed-off-by: Robert Love <robert.w.love@intel.com> Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com> Signed-off-by: James Bottomley <James.Bottomley@suse.de>
2009-07-30 00:05:10 +00:00
spin_unlock_bh(&mp->em_lock);
}
}
EXPORT_SYMBOL(fc_exch_mgr_reset);
/*
* Handle incoming ELS REC - Read Exchange Concise.
* Note that the requesting port may be different than the S_ID in the request.
*/
static void fc_exch_els_rec(struct fc_seq *sp, struct fc_frame *rfp)
{
struct fc_frame *fp;
struct fc_exch *ep;
struct fc_exch_mgr *em;
struct fc_els_rec *rp;
struct fc_els_rec_acc *acc;
enum fc_els_rjt_reason reason = ELS_RJT_LOGIC;
enum fc_els_rjt_explan explan;
u32 sid;
u16 rxid;
u16 oxid;
rp = fc_frame_payload_get(rfp, sizeof(*rp));
explan = ELS_EXPL_INV_LEN;
if (!rp)
goto reject;
sid = ntoh24(rp->rec_s_id);
rxid = ntohs(rp->rec_rx_id);
oxid = ntohs(rp->rec_ox_id);
/*
* Currently it's hard to find the local S_ID from the exchange
* manager. This will eventually be fixed, but for now it's easier
* to lookup the subject exchange twice, once as if we were
* the initiator, and then again if we weren't.
*/
em = fc_seq_exch(sp)->em;
ep = fc_exch_find(em, oxid);
explan = ELS_EXPL_OXID_RXID;
if (ep && ep->oid == sid) {
if (ep->rxid != FC_XID_UNKNOWN &&
rxid != FC_XID_UNKNOWN &&
ep->rxid != rxid)
goto rel;
} else {
if (ep)
fc_exch_release(ep);
ep = NULL;
if (rxid != FC_XID_UNKNOWN)
ep = fc_exch_find(em, rxid);
if (!ep)
goto reject;
}
fp = fc_frame_alloc(fc_seq_exch(sp)->lp, sizeof(*acc));
if (!fp) {
fc_exch_done(sp);
goto out;
}
sp = fc_seq_start_next(sp);
acc = fc_frame_payload_get(fp, sizeof(*acc));
memset(acc, 0, sizeof(*acc));
acc->reca_cmd = ELS_LS_ACC;
acc->reca_ox_id = rp->rec_ox_id;
memcpy(acc->reca_ofid, rp->rec_s_id, 3);
acc->reca_rx_id = htons(ep->rxid);
if (ep->sid == ep->oid)
hton24(acc->reca_rfid, ep->did);
else
hton24(acc->reca_rfid, ep->sid);
acc->reca_fc4value = htonl(ep->seq.rec_data);
acc->reca_e_stat = htonl(ep->esb_stat & (ESB_ST_RESP |
ESB_ST_SEQ_INIT |
ESB_ST_COMPLETE));
sp = fc_seq_start_next(sp);
fc_seq_send_last(sp, fp, FC_RCTL_ELS_REP, FC_TYPE_ELS);
out:
fc_exch_release(ep);
fc_frame_free(rfp);
return;
rel:
fc_exch_release(ep);
reject:
fc_seq_ls_rjt(sp, reason, explan);
fc_frame_free(rfp);
}
/*
* Handle response from RRQ.
* Not much to do here, really.
* Should report errors.
*
* TODO: fix error handler.
*/
static void fc_exch_rrq_resp(struct fc_seq *sp, struct fc_frame *fp, void *arg)
{
struct fc_exch *aborted_ep = arg;
unsigned int op;
if (IS_ERR(fp)) {
int err = PTR_ERR(fp);
if (err == -FC_EX_CLOSED || err == -FC_EX_TIMEOUT)
goto cleanup;
FC_EXCH_DBG(aborted_ep, "Cannot process RRQ, "
"frame error %d\n", err);
return;
}
op = fc_frame_payload_op(fp);
fc_frame_free(fp);
switch (op) {
case ELS_LS_RJT:
FC_EXCH_DBG(aborted_ep, "LS_RJT for RRQ");
/* fall through */
case ELS_LS_ACC:
goto cleanup;
default:
FC_EXCH_DBG(aborted_ep, "unexpected response op %x "
"for RRQ", op);
return;
}
cleanup:
fc_exch_done(&aborted_ep->seq);
/* drop hold for rec qual */
fc_exch_release(aborted_ep);
}
/*
* Send ELS RRQ - Reinstate Recovery Qualifier.
* This tells the remote port to stop blocking the use of
* the exchange and the seq_cnt range.
*/
static void fc_exch_rrq(struct fc_exch *ep)
{
struct fc_lport *lp;
struct fc_els_rrq *rrq;
struct fc_frame *fp;
u32 did;
lp = ep->lp;
fp = fc_frame_alloc(lp, sizeof(*rrq));
if (!fp)
goto retry;
rrq = fc_frame_payload_get(fp, sizeof(*rrq));
memset(rrq, 0, sizeof(*rrq));
rrq->rrq_cmd = ELS_RRQ;
hton24(rrq->rrq_s_id, ep->sid);
rrq->rrq_ox_id = htons(ep->oxid);
rrq->rrq_rx_id = htons(ep->rxid);
did = ep->did;
if (ep->esb_stat & ESB_ST_RESP)
did = ep->sid;
fc_fill_fc_hdr(fp, FC_RCTL_ELS_REQ, did,
fc_host_port_id(lp->host), FC_TYPE_ELS,
FC_FC_FIRST_SEQ | FC_FC_END_SEQ | FC_FC_SEQ_INIT, 0);
if (fc_exch_seq_send(lp, fp, fc_exch_rrq_resp, NULL, ep, lp->e_d_tov))
return;
retry:
spin_lock_bh(&ep->ex_lock);
if (ep->state & (FC_EX_RST_CLEANUP | FC_EX_DONE)) {
spin_unlock_bh(&ep->ex_lock);
/* drop hold for rec qual */
fc_exch_release(ep);
return;
}
ep->esb_stat |= ESB_ST_REC_QUAL;
fc_exch_timer_set_locked(ep, ep->r_a_tov);
spin_unlock_bh(&ep->ex_lock);
}
/*
* Handle incoming ELS RRQ - Reset Recovery Qualifier.
*/
static void fc_exch_els_rrq(struct fc_seq *sp, struct fc_frame *fp)
{
struct fc_exch *ep; /* request or subject exchange */
struct fc_els_rrq *rp;
u32 sid;
u16 xid;
enum fc_els_rjt_explan explan;
rp = fc_frame_payload_get(fp, sizeof(*rp));
explan = ELS_EXPL_INV_LEN;
if (!rp)
goto reject;
/*
* lookup subject exchange.
*/
ep = fc_seq_exch(sp);
sid = ntoh24(rp->rrq_s_id); /* subject source */
xid = ep->did == sid ? ntohs(rp->rrq_ox_id) : ntohs(rp->rrq_rx_id);
ep = fc_exch_find(ep->em, xid);
explan = ELS_EXPL_OXID_RXID;
if (!ep)
goto reject;
spin_lock_bh(&ep->ex_lock);
if (ep->oxid != ntohs(rp->rrq_ox_id))
goto unlock_reject;
if (ep->rxid != ntohs(rp->rrq_rx_id) &&
ep->rxid != FC_XID_UNKNOWN)
goto unlock_reject;
explan = ELS_EXPL_SID;
if (ep->sid != sid)
goto unlock_reject;
/*
* Clear Recovery Qualifier state, and cancel timer if complete.
*/
if (ep->esb_stat & ESB_ST_REC_QUAL) {
ep->esb_stat &= ~ESB_ST_REC_QUAL;
atomic_dec(&ep->ex_refcnt); /* drop hold for rec qual */
}
if (ep->esb_stat & ESB_ST_COMPLETE) {
if (cancel_delayed_work(&ep->timeout_work))
atomic_dec(&ep->ex_refcnt); /* drop timer hold */
}
spin_unlock_bh(&ep->ex_lock);
/*
* Send LS_ACC.
*/
fc_seq_ls_acc(sp);
fc_frame_free(fp);
return;
unlock_reject:
spin_unlock_bh(&ep->ex_lock);
fc_exch_release(ep); /* drop hold from fc_exch_find */
reject:
fc_seq_ls_rjt(sp, ELS_RJT_LOGIC, explan);
fc_frame_free(fp);
}
struct fc_exch_mgr_anchor *fc_exch_mgr_add(struct fc_lport *lport,
struct fc_exch_mgr *mp,
bool (*match)(struct fc_frame *))
{
struct fc_exch_mgr_anchor *ema;
ema = kmalloc(sizeof(*ema), GFP_ATOMIC);
if (!ema)
return ema;
ema->mp = mp;
ema->match = match;
/* add EM anchor to EM anchors list */
list_add_tail(&ema->ema_list, &lport->ema_list);
kref_get(&mp->kref);
return ema;
}
EXPORT_SYMBOL(fc_exch_mgr_add);
static void fc_exch_mgr_destroy(struct kref *kref)
{
struct fc_exch_mgr *mp = container_of(kref, struct fc_exch_mgr, kref);
/*
* The total exch count must be zero
* before freeing exchange manager.
*/
WARN_ON(mp->total_exches != 0);
mempool_destroy(mp->ep_pool);
kfree(mp);
}
void fc_exch_mgr_del(struct fc_exch_mgr_anchor *ema)
{
/* remove EM anchor from EM anchors list */
list_del(&ema->ema_list);
kref_put(&ema->mp->kref, fc_exch_mgr_destroy);
kfree(ema);
}
EXPORT_SYMBOL(fc_exch_mgr_del);
struct fc_exch_mgr *fc_exch_mgr_alloc(struct fc_lport *lp,
enum fc_class class,
[SCSI] fcoe, fnic, libfc: modifies current code paths to use EM anchor list Modifies current code to use EM anchor list in EM allocation, EM free, EM reset, exch allocation and exch lookup code paths. 1. Modifies fc_exch_mgr_alloc to accept EM match function and then have allocated EM added to the lport using fc_exch_mgr_add API while also updating EM kref for newly added EM. 2. Updates fc_exch_mgr_free API to accept only lport pointer instead EM and then have this API free all EMs of the lport from EM anchor list. 3. Removes single lport pointer link from the EM, which was used in associating lport pointer in newly allocated exchange. Instead have lport pointer passed along new exchange allocation call path and then store passed lport pointer in newly allocated exchange, this will allow a single EM instance to be used across more than one lport and used in EM reset to reset only lport specific exchanges. 4. Modifies fc_exch_mgr_reset to reset all EMs from the EM anchor list of the lport, adds additional exch lport pointer (ep->lp) check for shared EM case to reset exchange specific to a lport requested reset. 5. Updates exch allocation API fc_exch_alloc to use EM anchor list and its anchor match func pointer. The fc_exch_alloc will walk the list of EMs until it finds a match, a match will be either null match func pointer or call to match function returning true value. 6. Updates fc_exch_recv to accept incoming frame on local port using only lport pointer and frame pointer without specifying EM instance of incoming frame. Instead modified fc_exch_recv to locate EM for the incoming frame by matching xid of incoming frame against a EM xid range. This change was required to use EM list in libfc Rx path and after this change the lport fc_exch_mgr pointer emp is not needed anymore, so removed emp pointer. 7. Updates fnic for removed lport emp pointer and above modified libfc APIs fc_exch_recv, fc_exch_mgr_alloc and fc_exch_mgr_free. 8. Removes exch_get and exch_put from libfc_function_template as these are no longer needed with EM anchor list and its match function use. Also removes its default function fc_exch_get. A defect this patch introduced regarding the libfc initialization order in the fnic driver was fixed by Joe Eykholt <jeykholt@cisco.com>. Signed-off-by: Vasu Dev <vasu.dev@intel.com> Signed-off-by: Robert Love <robert.w.love@intel.com> Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com> Signed-off-by: James Bottomley <James.Bottomley@suse.de>
2009-07-30 00:05:10 +00:00
u16 min_xid, u16 max_xid,
bool (*match)(struct fc_frame *))
{
struct fc_exch_mgr *mp;
size_t len;
if (max_xid <= min_xid || max_xid == FC_XID_UNKNOWN) {
FC_LPORT_DBG(lp, "Invalid min_xid 0x:%x and max_xid 0x:%x\n",
min_xid, max_xid);
return NULL;
}
/*
* Memory need for EM
*/
len = (max_xid - min_xid + 1) * (sizeof(struct fc_exch *));
len += sizeof(struct fc_exch_mgr);
mp = kzalloc(len, GFP_ATOMIC);
if (!mp)
return NULL;
mp->class = class;
mp->total_exches = 0;
mp->exches = (struct fc_exch **)(mp + 1);
/* adjust em exch xid range for offload */
mp->min_xid = min_xid;
mp->max_xid = max_xid;
mp->next_xid = min_xid;
INIT_LIST_HEAD(&mp->ex_list);
spin_lock_init(&mp->em_lock);
mp->ep_pool = mempool_create_slab_pool(2, fc_em_cachep);
if (!mp->ep_pool)
goto free_mp;
[SCSI] fcoe, fnic, libfc: modifies current code paths to use EM anchor list Modifies current code to use EM anchor list in EM allocation, EM free, EM reset, exch allocation and exch lookup code paths. 1. Modifies fc_exch_mgr_alloc to accept EM match function and then have allocated EM added to the lport using fc_exch_mgr_add API while also updating EM kref for newly added EM. 2. Updates fc_exch_mgr_free API to accept only lport pointer instead EM and then have this API free all EMs of the lport from EM anchor list. 3. Removes single lport pointer link from the EM, which was used in associating lport pointer in newly allocated exchange. Instead have lport pointer passed along new exchange allocation call path and then store passed lport pointer in newly allocated exchange, this will allow a single EM instance to be used across more than one lport and used in EM reset to reset only lport specific exchanges. 4. Modifies fc_exch_mgr_reset to reset all EMs from the EM anchor list of the lport, adds additional exch lport pointer (ep->lp) check for shared EM case to reset exchange specific to a lport requested reset. 5. Updates exch allocation API fc_exch_alloc to use EM anchor list and its anchor match func pointer. The fc_exch_alloc will walk the list of EMs until it finds a match, a match will be either null match func pointer or call to match function returning true value. 6. Updates fc_exch_recv to accept incoming frame on local port using only lport pointer and frame pointer without specifying EM instance of incoming frame. Instead modified fc_exch_recv to locate EM for the incoming frame by matching xid of incoming frame against a EM xid range. This change was required to use EM list in libfc Rx path and after this change the lport fc_exch_mgr pointer emp is not needed anymore, so removed emp pointer. 7. Updates fnic for removed lport emp pointer and above modified libfc APIs fc_exch_recv, fc_exch_mgr_alloc and fc_exch_mgr_free. 8. Removes exch_get and exch_put from libfc_function_template as these are no longer needed with EM anchor list and its match function use. Also removes its default function fc_exch_get. A defect this patch introduced regarding the libfc initialization order in the fnic driver was fixed by Joe Eykholt <jeykholt@cisco.com>. Signed-off-by: Vasu Dev <vasu.dev@intel.com> Signed-off-by: Robert Love <robert.w.love@intel.com> Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com> Signed-off-by: James Bottomley <James.Bottomley@suse.de>
2009-07-30 00:05:10 +00:00
kref_init(&mp->kref);
if (!fc_exch_mgr_add(lp, mp, match)) {
mempool_destroy(mp->ep_pool);
goto free_mp;
}
/*
* Above kref_init() sets mp->kref to 1 and then
* call to fc_exch_mgr_add incremented mp->kref again,
* so adjust that extra increment.
*/
kref_put(&mp->kref, fc_exch_mgr_destroy);
return mp;
free_mp:
kfree(mp);
return NULL;
}
EXPORT_SYMBOL(fc_exch_mgr_alloc);
[SCSI] fcoe, fnic, libfc: modifies current code paths to use EM anchor list Modifies current code to use EM anchor list in EM allocation, EM free, EM reset, exch allocation and exch lookup code paths. 1. Modifies fc_exch_mgr_alloc to accept EM match function and then have allocated EM added to the lport using fc_exch_mgr_add API while also updating EM kref for newly added EM. 2. Updates fc_exch_mgr_free API to accept only lport pointer instead EM and then have this API free all EMs of the lport from EM anchor list. 3. Removes single lport pointer link from the EM, which was used in associating lport pointer in newly allocated exchange. Instead have lport pointer passed along new exchange allocation call path and then store passed lport pointer in newly allocated exchange, this will allow a single EM instance to be used across more than one lport and used in EM reset to reset only lport specific exchanges. 4. Modifies fc_exch_mgr_reset to reset all EMs from the EM anchor list of the lport, adds additional exch lport pointer (ep->lp) check for shared EM case to reset exchange specific to a lport requested reset. 5. Updates exch allocation API fc_exch_alloc to use EM anchor list and its anchor match func pointer. The fc_exch_alloc will walk the list of EMs until it finds a match, a match will be either null match func pointer or call to match function returning true value. 6. Updates fc_exch_recv to accept incoming frame on local port using only lport pointer and frame pointer without specifying EM instance of incoming frame. Instead modified fc_exch_recv to locate EM for the incoming frame by matching xid of incoming frame against a EM xid range. This change was required to use EM list in libfc Rx path and after this change the lport fc_exch_mgr pointer emp is not needed anymore, so removed emp pointer. 7. Updates fnic for removed lport emp pointer and above modified libfc APIs fc_exch_recv, fc_exch_mgr_alloc and fc_exch_mgr_free. 8. Removes exch_get and exch_put from libfc_function_template as these are no longer needed with EM anchor list and its match function use. Also removes its default function fc_exch_get. A defect this patch introduced regarding the libfc initialization order in the fnic driver was fixed by Joe Eykholt <jeykholt@cisco.com>. Signed-off-by: Vasu Dev <vasu.dev@intel.com> Signed-off-by: Robert Love <robert.w.love@intel.com> Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com> Signed-off-by: James Bottomley <James.Bottomley@suse.de>
2009-07-30 00:05:10 +00:00
void fc_exch_mgr_free(struct fc_lport *lport)
{
[SCSI] fcoe, fnic, libfc: modifies current code paths to use EM anchor list Modifies current code to use EM anchor list in EM allocation, EM free, EM reset, exch allocation and exch lookup code paths. 1. Modifies fc_exch_mgr_alloc to accept EM match function and then have allocated EM added to the lport using fc_exch_mgr_add API while also updating EM kref for newly added EM. 2. Updates fc_exch_mgr_free API to accept only lport pointer instead EM and then have this API free all EMs of the lport from EM anchor list. 3. Removes single lport pointer link from the EM, which was used in associating lport pointer in newly allocated exchange. Instead have lport pointer passed along new exchange allocation call path and then store passed lport pointer in newly allocated exchange, this will allow a single EM instance to be used across more than one lport and used in EM reset to reset only lport specific exchanges. 4. Modifies fc_exch_mgr_reset to reset all EMs from the EM anchor list of the lport, adds additional exch lport pointer (ep->lp) check for shared EM case to reset exchange specific to a lport requested reset. 5. Updates exch allocation API fc_exch_alloc to use EM anchor list and its anchor match func pointer. The fc_exch_alloc will walk the list of EMs until it finds a match, a match will be either null match func pointer or call to match function returning true value. 6. Updates fc_exch_recv to accept incoming frame on local port using only lport pointer and frame pointer without specifying EM instance of incoming frame. Instead modified fc_exch_recv to locate EM for the incoming frame by matching xid of incoming frame against a EM xid range. This change was required to use EM list in libfc Rx path and after this change the lport fc_exch_mgr pointer emp is not needed anymore, so removed emp pointer. 7. Updates fnic for removed lport emp pointer and above modified libfc APIs fc_exch_recv, fc_exch_mgr_alloc and fc_exch_mgr_free. 8. Removes exch_get and exch_put from libfc_function_template as these are no longer needed with EM anchor list and its match function use. Also removes its default function fc_exch_get. A defect this patch introduced regarding the libfc initialization order in the fnic driver was fixed by Joe Eykholt <jeykholt@cisco.com>. Signed-off-by: Vasu Dev <vasu.dev@intel.com> Signed-off-by: Robert Love <robert.w.love@intel.com> Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com> Signed-off-by: James Bottomley <James.Bottomley@suse.de>
2009-07-30 00:05:10 +00:00
struct fc_exch_mgr_anchor *ema, *next;
list_for_each_entry_safe(ema, next, &lport->ema_list, ema_list)
fc_exch_mgr_del(ema);
}
EXPORT_SYMBOL(fc_exch_mgr_free);
struct fc_seq *fc_exch_seq_send(struct fc_lport *lp,
struct fc_frame *fp,
void (*resp)(struct fc_seq *,
struct fc_frame *fp,
void *arg),
void (*destructor)(struct fc_seq *, void *),
void *arg, u32 timer_msec)
{
struct fc_exch *ep;
struct fc_seq *sp = NULL;
struct fc_frame_header *fh;
int rc = 1;
[SCSI] fcoe, fnic, libfc: modifies current code paths to use EM anchor list Modifies current code to use EM anchor list in EM allocation, EM free, EM reset, exch allocation and exch lookup code paths. 1. Modifies fc_exch_mgr_alloc to accept EM match function and then have allocated EM added to the lport using fc_exch_mgr_add API while also updating EM kref for newly added EM. 2. Updates fc_exch_mgr_free API to accept only lport pointer instead EM and then have this API free all EMs of the lport from EM anchor list. 3. Removes single lport pointer link from the EM, which was used in associating lport pointer in newly allocated exchange. Instead have lport pointer passed along new exchange allocation call path and then store passed lport pointer in newly allocated exchange, this will allow a single EM instance to be used across more than one lport and used in EM reset to reset only lport specific exchanges. 4. Modifies fc_exch_mgr_reset to reset all EMs from the EM anchor list of the lport, adds additional exch lport pointer (ep->lp) check for shared EM case to reset exchange specific to a lport requested reset. 5. Updates exch allocation API fc_exch_alloc to use EM anchor list and its anchor match func pointer. The fc_exch_alloc will walk the list of EMs until it finds a match, a match will be either null match func pointer or call to match function returning true value. 6. Updates fc_exch_recv to accept incoming frame on local port using only lport pointer and frame pointer without specifying EM instance of incoming frame. Instead modified fc_exch_recv to locate EM for the incoming frame by matching xid of incoming frame against a EM xid range. This change was required to use EM list in libfc Rx path and after this change the lport fc_exch_mgr pointer emp is not needed anymore, so removed emp pointer. 7. Updates fnic for removed lport emp pointer and above modified libfc APIs fc_exch_recv, fc_exch_mgr_alloc and fc_exch_mgr_free. 8. Removes exch_get and exch_put from libfc_function_template as these are no longer needed with EM anchor list and its match function use. Also removes its default function fc_exch_get. A defect this patch introduced regarding the libfc initialization order in the fnic driver was fixed by Joe Eykholt <jeykholt@cisco.com>. Signed-off-by: Vasu Dev <vasu.dev@intel.com> Signed-off-by: Robert Love <robert.w.love@intel.com> Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com> Signed-off-by: James Bottomley <James.Bottomley@suse.de>
2009-07-30 00:05:10 +00:00
ep = fc_exch_alloc(lp, fp);
if (!ep) {
fc_frame_free(fp);
return NULL;
}
ep->esb_stat |= ESB_ST_SEQ_INIT;
fh = fc_frame_header_get(fp);
fc_exch_set_addr(ep, ntoh24(fh->fh_s_id), ntoh24(fh->fh_d_id));
ep->resp = resp;
ep->destructor = destructor;
ep->arg = arg;
ep->r_a_tov = FC_DEF_R_A_TOV;
ep->lp = lp;
sp = &ep->seq;
ep->fh_type = fh->fh_type; /* save for possbile timeout handling */
ep->f_ctl = ntoh24(fh->fh_f_ctl);
fc_exch_setup_hdr(ep, fp, ep->f_ctl);
sp->cnt++;
if (ep->xid <= lp->lro_xid)
fc_fcp_ddp_setup(fr_fsp(fp), ep->xid);
if (unlikely(lp->tt.frame_send(lp, fp)))
goto err;
if (timer_msec)
fc_exch_timer_set_locked(ep, timer_msec);
ep->f_ctl &= ~FC_FC_FIRST_SEQ; /* not first seq */
if (ep->f_ctl & FC_FC_SEQ_INIT)
ep->esb_stat &= ~ESB_ST_SEQ_INIT;
spin_unlock_bh(&ep->ex_lock);
return sp;
err:
rc = fc_exch_done_locked(ep);
spin_unlock_bh(&ep->ex_lock);
if (!rc)
fc_exch_mgr_delete_ep(ep);
return NULL;
}
EXPORT_SYMBOL(fc_exch_seq_send);
/*
* Receive a frame
*/
[SCSI] fcoe, fnic, libfc: modifies current code paths to use EM anchor list Modifies current code to use EM anchor list in EM allocation, EM free, EM reset, exch allocation and exch lookup code paths. 1. Modifies fc_exch_mgr_alloc to accept EM match function and then have allocated EM added to the lport using fc_exch_mgr_add API while also updating EM kref for newly added EM. 2. Updates fc_exch_mgr_free API to accept only lport pointer instead EM and then have this API free all EMs of the lport from EM anchor list. 3. Removes single lport pointer link from the EM, which was used in associating lport pointer in newly allocated exchange. Instead have lport pointer passed along new exchange allocation call path and then store passed lport pointer in newly allocated exchange, this will allow a single EM instance to be used across more than one lport and used in EM reset to reset only lport specific exchanges. 4. Modifies fc_exch_mgr_reset to reset all EMs from the EM anchor list of the lport, adds additional exch lport pointer (ep->lp) check for shared EM case to reset exchange specific to a lport requested reset. 5. Updates exch allocation API fc_exch_alloc to use EM anchor list and its anchor match func pointer. The fc_exch_alloc will walk the list of EMs until it finds a match, a match will be either null match func pointer or call to match function returning true value. 6. Updates fc_exch_recv to accept incoming frame on local port using only lport pointer and frame pointer without specifying EM instance of incoming frame. Instead modified fc_exch_recv to locate EM for the incoming frame by matching xid of incoming frame against a EM xid range. This change was required to use EM list in libfc Rx path and after this change the lport fc_exch_mgr pointer emp is not needed anymore, so removed emp pointer. 7. Updates fnic for removed lport emp pointer and above modified libfc APIs fc_exch_recv, fc_exch_mgr_alloc and fc_exch_mgr_free. 8. Removes exch_get and exch_put from libfc_function_template as these are no longer needed with EM anchor list and its match function use. Also removes its default function fc_exch_get. A defect this patch introduced regarding the libfc initialization order in the fnic driver was fixed by Joe Eykholt <jeykholt@cisco.com>. Signed-off-by: Vasu Dev <vasu.dev@intel.com> Signed-off-by: Robert Love <robert.w.love@intel.com> Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com> Signed-off-by: James Bottomley <James.Bottomley@suse.de>
2009-07-30 00:05:10 +00:00
void fc_exch_recv(struct fc_lport *lp, struct fc_frame *fp)
{
struct fc_frame_header *fh = fc_frame_header_get(fp);
[SCSI] fcoe, fnic, libfc: modifies current code paths to use EM anchor list Modifies current code to use EM anchor list in EM allocation, EM free, EM reset, exch allocation and exch lookup code paths. 1. Modifies fc_exch_mgr_alloc to accept EM match function and then have allocated EM added to the lport using fc_exch_mgr_add API while also updating EM kref for newly added EM. 2. Updates fc_exch_mgr_free API to accept only lport pointer instead EM and then have this API free all EMs of the lport from EM anchor list. 3. Removes single lport pointer link from the EM, which was used in associating lport pointer in newly allocated exchange. Instead have lport pointer passed along new exchange allocation call path and then store passed lport pointer in newly allocated exchange, this will allow a single EM instance to be used across more than one lport and used in EM reset to reset only lport specific exchanges. 4. Modifies fc_exch_mgr_reset to reset all EMs from the EM anchor list of the lport, adds additional exch lport pointer (ep->lp) check for shared EM case to reset exchange specific to a lport requested reset. 5. Updates exch allocation API fc_exch_alloc to use EM anchor list and its anchor match func pointer. The fc_exch_alloc will walk the list of EMs until it finds a match, a match will be either null match func pointer or call to match function returning true value. 6. Updates fc_exch_recv to accept incoming frame on local port using only lport pointer and frame pointer without specifying EM instance of incoming frame. Instead modified fc_exch_recv to locate EM for the incoming frame by matching xid of incoming frame against a EM xid range. This change was required to use EM list in libfc Rx path and after this change the lport fc_exch_mgr pointer emp is not needed anymore, so removed emp pointer. 7. Updates fnic for removed lport emp pointer and above modified libfc APIs fc_exch_recv, fc_exch_mgr_alloc and fc_exch_mgr_free. 8. Removes exch_get and exch_put from libfc_function_template as these are no longer needed with EM anchor list and its match function use. Also removes its default function fc_exch_get. A defect this patch introduced regarding the libfc initialization order in the fnic driver was fixed by Joe Eykholt <jeykholt@cisco.com>. Signed-off-by: Vasu Dev <vasu.dev@intel.com> Signed-off-by: Robert Love <robert.w.love@intel.com> Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com> Signed-off-by: James Bottomley <James.Bottomley@suse.de>
2009-07-30 00:05:10 +00:00
struct fc_exch_mgr_anchor *ema;
u32 f_ctl, found = 0;
u16 oxid;
/* lport lock ? */
[SCSI] fcoe, fnic, libfc: modifies current code paths to use EM anchor list Modifies current code to use EM anchor list in EM allocation, EM free, EM reset, exch allocation and exch lookup code paths. 1. Modifies fc_exch_mgr_alloc to accept EM match function and then have allocated EM added to the lport using fc_exch_mgr_add API while also updating EM kref for newly added EM. 2. Updates fc_exch_mgr_free API to accept only lport pointer instead EM and then have this API free all EMs of the lport from EM anchor list. 3. Removes single lport pointer link from the EM, which was used in associating lport pointer in newly allocated exchange. Instead have lport pointer passed along new exchange allocation call path and then store passed lport pointer in newly allocated exchange, this will allow a single EM instance to be used across more than one lport and used in EM reset to reset only lport specific exchanges. 4. Modifies fc_exch_mgr_reset to reset all EMs from the EM anchor list of the lport, adds additional exch lport pointer (ep->lp) check for shared EM case to reset exchange specific to a lport requested reset. 5. Updates exch allocation API fc_exch_alloc to use EM anchor list and its anchor match func pointer. The fc_exch_alloc will walk the list of EMs until it finds a match, a match will be either null match func pointer or call to match function returning true value. 6. Updates fc_exch_recv to accept incoming frame on local port using only lport pointer and frame pointer without specifying EM instance of incoming frame. Instead modified fc_exch_recv to locate EM for the incoming frame by matching xid of incoming frame against a EM xid range. This change was required to use EM list in libfc Rx path and after this change the lport fc_exch_mgr pointer emp is not needed anymore, so removed emp pointer. 7. Updates fnic for removed lport emp pointer and above modified libfc APIs fc_exch_recv, fc_exch_mgr_alloc and fc_exch_mgr_free. 8. Removes exch_get and exch_put from libfc_function_template as these are no longer needed with EM anchor list and its match function use. Also removes its default function fc_exch_get. A defect this patch introduced regarding the libfc initialization order in the fnic driver was fixed by Joe Eykholt <jeykholt@cisco.com>. Signed-off-by: Vasu Dev <vasu.dev@intel.com> Signed-off-by: Robert Love <robert.w.love@intel.com> Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com> Signed-off-by: James Bottomley <James.Bottomley@suse.de>
2009-07-30 00:05:10 +00:00
if (!lp || lp->state == LPORT_ST_DISABLED) {
FC_LPORT_DBG(lp, "Receiving frames for an lport that "
"has not been initialized correctly\n");
fc_frame_free(fp);
return;
}
[SCSI] fcoe, fnic, libfc: modifies current code paths to use EM anchor list Modifies current code to use EM anchor list in EM allocation, EM free, EM reset, exch allocation and exch lookup code paths. 1. Modifies fc_exch_mgr_alloc to accept EM match function and then have allocated EM added to the lport using fc_exch_mgr_add API while also updating EM kref for newly added EM. 2. Updates fc_exch_mgr_free API to accept only lport pointer instead EM and then have this API free all EMs of the lport from EM anchor list. 3. Removes single lport pointer link from the EM, which was used in associating lport pointer in newly allocated exchange. Instead have lport pointer passed along new exchange allocation call path and then store passed lport pointer in newly allocated exchange, this will allow a single EM instance to be used across more than one lport and used in EM reset to reset only lport specific exchanges. 4. Modifies fc_exch_mgr_reset to reset all EMs from the EM anchor list of the lport, adds additional exch lport pointer (ep->lp) check for shared EM case to reset exchange specific to a lport requested reset. 5. Updates exch allocation API fc_exch_alloc to use EM anchor list and its anchor match func pointer. The fc_exch_alloc will walk the list of EMs until it finds a match, a match will be either null match func pointer or call to match function returning true value. 6. Updates fc_exch_recv to accept incoming frame on local port using only lport pointer and frame pointer without specifying EM instance of incoming frame. Instead modified fc_exch_recv to locate EM for the incoming frame by matching xid of incoming frame against a EM xid range. This change was required to use EM list in libfc Rx path and after this change the lport fc_exch_mgr pointer emp is not needed anymore, so removed emp pointer. 7. Updates fnic for removed lport emp pointer and above modified libfc APIs fc_exch_recv, fc_exch_mgr_alloc and fc_exch_mgr_free. 8. Removes exch_get and exch_put from libfc_function_template as these are no longer needed with EM anchor list and its match function use. Also removes its default function fc_exch_get. A defect this patch introduced regarding the libfc initialization order in the fnic driver was fixed by Joe Eykholt <jeykholt@cisco.com>. Signed-off-by: Vasu Dev <vasu.dev@intel.com> Signed-off-by: Robert Love <robert.w.love@intel.com> Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com> Signed-off-by: James Bottomley <James.Bottomley@suse.de>
2009-07-30 00:05:10 +00:00
f_ctl = ntoh24(fh->fh_f_ctl);
oxid = ntohs(fh->fh_ox_id);
if (f_ctl & FC_FC_EX_CTX) {
list_for_each_entry(ema, &lp->ema_list, ema_list) {
if ((oxid >= ema->mp->min_xid) &&
(oxid <= ema->mp->max_xid)) {
found = 1;
break;
}
}
if (!found) {
FC_LPORT_DBG(lp, "Received response for out "
"of range oxid:%hx\n", oxid);
fc_frame_free(fp);
return;
}
} else
ema = list_entry(lp->ema_list.prev, typeof(*ema), ema_list);
/*
* If frame is marked invalid, just drop it.
*/
switch (fr_eof(fp)) {
case FC_EOF_T:
if (f_ctl & FC_FC_END_SEQ)
skb_trim(fp_skb(fp), fr_len(fp) - FC_FC_FILL(f_ctl));
/* fall through */
case FC_EOF_N:
if (fh->fh_type == FC_TYPE_BLS)
[SCSI] fcoe, fnic, libfc: modifies current code paths to use EM anchor list Modifies current code to use EM anchor list in EM allocation, EM free, EM reset, exch allocation and exch lookup code paths. 1. Modifies fc_exch_mgr_alloc to accept EM match function and then have allocated EM added to the lport using fc_exch_mgr_add API while also updating EM kref for newly added EM. 2. Updates fc_exch_mgr_free API to accept only lport pointer instead EM and then have this API free all EMs of the lport from EM anchor list. 3. Removes single lport pointer link from the EM, which was used in associating lport pointer in newly allocated exchange. Instead have lport pointer passed along new exchange allocation call path and then store passed lport pointer in newly allocated exchange, this will allow a single EM instance to be used across more than one lport and used in EM reset to reset only lport specific exchanges. 4. Modifies fc_exch_mgr_reset to reset all EMs from the EM anchor list of the lport, adds additional exch lport pointer (ep->lp) check for shared EM case to reset exchange specific to a lport requested reset. 5. Updates exch allocation API fc_exch_alloc to use EM anchor list and its anchor match func pointer. The fc_exch_alloc will walk the list of EMs until it finds a match, a match will be either null match func pointer or call to match function returning true value. 6. Updates fc_exch_recv to accept incoming frame on local port using only lport pointer and frame pointer without specifying EM instance of incoming frame. Instead modified fc_exch_recv to locate EM for the incoming frame by matching xid of incoming frame against a EM xid range. This change was required to use EM list in libfc Rx path and after this change the lport fc_exch_mgr pointer emp is not needed anymore, so removed emp pointer. 7. Updates fnic for removed lport emp pointer and above modified libfc APIs fc_exch_recv, fc_exch_mgr_alloc and fc_exch_mgr_free. 8. Removes exch_get and exch_put from libfc_function_template as these are no longer needed with EM anchor list and its match function use. Also removes its default function fc_exch_get. A defect this patch introduced regarding the libfc initialization order in the fnic driver was fixed by Joe Eykholt <jeykholt@cisco.com>. Signed-off-by: Vasu Dev <vasu.dev@intel.com> Signed-off-by: Robert Love <robert.w.love@intel.com> Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com> Signed-off-by: James Bottomley <James.Bottomley@suse.de>
2009-07-30 00:05:10 +00:00
fc_exch_recv_bls(ema->mp, fp);
else if ((f_ctl & (FC_FC_EX_CTX | FC_FC_SEQ_CTX)) ==
FC_FC_EX_CTX)
[SCSI] fcoe, fnic, libfc: modifies current code paths to use EM anchor list Modifies current code to use EM anchor list in EM allocation, EM free, EM reset, exch allocation and exch lookup code paths. 1. Modifies fc_exch_mgr_alloc to accept EM match function and then have allocated EM added to the lport using fc_exch_mgr_add API while also updating EM kref for newly added EM. 2. Updates fc_exch_mgr_free API to accept only lport pointer instead EM and then have this API free all EMs of the lport from EM anchor list. 3. Removes single lport pointer link from the EM, which was used in associating lport pointer in newly allocated exchange. Instead have lport pointer passed along new exchange allocation call path and then store passed lport pointer in newly allocated exchange, this will allow a single EM instance to be used across more than one lport and used in EM reset to reset only lport specific exchanges. 4. Modifies fc_exch_mgr_reset to reset all EMs from the EM anchor list of the lport, adds additional exch lport pointer (ep->lp) check for shared EM case to reset exchange specific to a lport requested reset. 5. Updates exch allocation API fc_exch_alloc to use EM anchor list and its anchor match func pointer. The fc_exch_alloc will walk the list of EMs until it finds a match, a match will be either null match func pointer or call to match function returning true value. 6. Updates fc_exch_recv to accept incoming frame on local port using only lport pointer and frame pointer without specifying EM instance of incoming frame. Instead modified fc_exch_recv to locate EM for the incoming frame by matching xid of incoming frame against a EM xid range. This change was required to use EM list in libfc Rx path and after this change the lport fc_exch_mgr pointer emp is not needed anymore, so removed emp pointer. 7. Updates fnic for removed lport emp pointer and above modified libfc APIs fc_exch_recv, fc_exch_mgr_alloc and fc_exch_mgr_free. 8. Removes exch_get and exch_put from libfc_function_template as these are no longer needed with EM anchor list and its match function use. Also removes its default function fc_exch_get. A defect this patch introduced regarding the libfc initialization order in the fnic driver was fixed by Joe Eykholt <jeykholt@cisco.com>. Signed-off-by: Vasu Dev <vasu.dev@intel.com> Signed-off-by: Robert Love <robert.w.love@intel.com> Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com> Signed-off-by: James Bottomley <James.Bottomley@suse.de>
2009-07-30 00:05:10 +00:00
fc_exch_recv_seq_resp(ema->mp, fp);
else if (f_ctl & FC_FC_SEQ_CTX)
[SCSI] fcoe, fnic, libfc: modifies current code paths to use EM anchor list Modifies current code to use EM anchor list in EM allocation, EM free, EM reset, exch allocation and exch lookup code paths. 1. Modifies fc_exch_mgr_alloc to accept EM match function and then have allocated EM added to the lport using fc_exch_mgr_add API while also updating EM kref for newly added EM. 2. Updates fc_exch_mgr_free API to accept only lport pointer instead EM and then have this API free all EMs of the lport from EM anchor list. 3. Removes single lport pointer link from the EM, which was used in associating lport pointer in newly allocated exchange. Instead have lport pointer passed along new exchange allocation call path and then store passed lport pointer in newly allocated exchange, this will allow a single EM instance to be used across more than one lport and used in EM reset to reset only lport specific exchanges. 4. Modifies fc_exch_mgr_reset to reset all EMs from the EM anchor list of the lport, adds additional exch lport pointer (ep->lp) check for shared EM case to reset exchange specific to a lport requested reset. 5. Updates exch allocation API fc_exch_alloc to use EM anchor list and its anchor match func pointer. The fc_exch_alloc will walk the list of EMs until it finds a match, a match will be either null match func pointer or call to match function returning true value. 6. Updates fc_exch_recv to accept incoming frame on local port using only lport pointer and frame pointer without specifying EM instance of incoming frame. Instead modified fc_exch_recv to locate EM for the incoming frame by matching xid of incoming frame against a EM xid range. This change was required to use EM list in libfc Rx path and after this change the lport fc_exch_mgr pointer emp is not needed anymore, so removed emp pointer. 7. Updates fnic for removed lport emp pointer and above modified libfc APIs fc_exch_recv, fc_exch_mgr_alloc and fc_exch_mgr_free. 8. Removes exch_get and exch_put from libfc_function_template as these are no longer needed with EM anchor list and its match function use. Also removes its default function fc_exch_get. A defect this patch introduced regarding the libfc initialization order in the fnic driver was fixed by Joe Eykholt <jeykholt@cisco.com>. Signed-off-by: Vasu Dev <vasu.dev@intel.com> Signed-off-by: Robert Love <robert.w.love@intel.com> Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com> Signed-off-by: James Bottomley <James.Bottomley@suse.de>
2009-07-30 00:05:10 +00:00
fc_exch_recv_resp(ema->mp, fp);
else
[SCSI] fcoe, fnic, libfc: modifies current code paths to use EM anchor list Modifies current code to use EM anchor list in EM allocation, EM free, EM reset, exch allocation and exch lookup code paths. 1. Modifies fc_exch_mgr_alloc to accept EM match function and then have allocated EM added to the lport using fc_exch_mgr_add API while also updating EM kref for newly added EM. 2. Updates fc_exch_mgr_free API to accept only lport pointer instead EM and then have this API free all EMs of the lport from EM anchor list. 3. Removes single lport pointer link from the EM, which was used in associating lport pointer in newly allocated exchange. Instead have lport pointer passed along new exchange allocation call path and then store passed lport pointer in newly allocated exchange, this will allow a single EM instance to be used across more than one lport and used in EM reset to reset only lport specific exchanges. 4. Modifies fc_exch_mgr_reset to reset all EMs from the EM anchor list of the lport, adds additional exch lport pointer (ep->lp) check for shared EM case to reset exchange specific to a lport requested reset. 5. Updates exch allocation API fc_exch_alloc to use EM anchor list and its anchor match func pointer. The fc_exch_alloc will walk the list of EMs until it finds a match, a match will be either null match func pointer or call to match function returning true value. 6. Updates fc_exch_recv to accept incoming frame on local port using only lport pointer and frame pointer without specifying EM instance of incoming frame. Instead modified fc_exch_recv to locate EM for the incoming frame by matching xid of incoming frame against a EM xid range. This change was required to use EM list in libfc Rx path and after this change the lport fc_exch_mgr pointer emp is not needed anymore, so removed emp pointer. 7. Updates fnic for removed lport emp pointer and above modified libfc APIs fc_exch_recv, fc_exch_mgr_alloc and fc_exch_mgr_free. 8. Removes exch_get and exch_put from libfc_function_template as these are no longer needed with EM anchor list and its match function use. Also removes its default function fc_exch_get. A defect this patch introduced regarding the libfc initialization order in the fnic driver was fixed by Joe Eykholt <jeykholt@cisco.com>. Signed-off-by: Vasu Dev <vasu.dev@intel.com> Signed-off-by: Robert Love <robert.w.love@intel.com> Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com> Signed-off-by: James Bottomley <James.Bottomley@suse.de>
2009-07-30 00:05:10 +00:00
fc_exch_recv_req(lp, ema->mp, fp);
break;
default:
FC_LPORT_DBG(lp, "dropping invalid frame (eof %x)", fr_eof(fp));
fc_frame_free(fp);
}
}
EXPORT_SYMBOL(fc_exch_recv);
int fc_exch_init(struct fc_lport *lp)
{
if (!lp->tt.seq_start_next)
lp->tt.seq_start_next = fc_seq_start_next;
if (!lp->tt.exch_seq_send)
lp->tt.exch_seq_send = fc_exch_seq_send;
if (!lp->tt.seq_send)
lp->tt.seq_send = fc_seq_send;
if (!lp->tt.seq_els_rsp_send)
lp->tt.seq_els_rsp_send = fc_seq_els_rsp_send;
if (!lp->tt.exch_done)
lp->tt.exch_done = fc_exch_done;
if (!lp->tt.exch_mgr_reset)
lp->tt.exch_mgr_reset = fc_exch_mgr_reset;
if (!lp->tt.seq_exch_abort)
lp->tt.seq_exch_abort = fc_seq_exch_abort;
return 0;
}
EXPORT_SYMBOL(fc_exch_init);
int fc_setup_exch_mgr(void)
{
fc_em_cachep = kmem_cache_create("libfc_em", sizeof(struct fc_exch),
0, SLAB_HWCACHE_ALIGN, NULL);
if (!fc_em_cachep)
return -ENOMEM;
return 0;
}
void fc_destroy_exch_mgr(void)
{
kmem_cache_destroy(fc_em_cachep);
}