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linux/drivers/scsi/fcoe/fcoe_ctlr.c
Johannes Berg d58ff35122 networking: make skb_push & __skb_push return void pointers 
It seems like a historic accident that these return unsigned char *,
and in many places that means casts are required, more often than not.

Make these functions return void * and remove all the casts across
the tree, adding a (u8 *) cast only where the unsigned char pointer
was used directly, all done with the following spatch:

    @@
    expression SKB, LEN;
    typedef u8;
    identifier fn = { skb_push, __skb_push, skb_push_rcsum };
    @@
    - *(fn(SKB, LEN))
    + *(u8 *)fn(SKB, LEN)

    @@
    expression E, SKB, LEN;
    identifier fn = { skb_push, __skb_push, skb_push_rcsum };
    type T;
    @@
    - E = ((T *)(fn(SKB, LEN)))
    + E = fn(SKB, LEN)

    @@
    expression SKB, LEN;
    identifier fn = { skb_push, __skb_push, skb_push_rcsum };
    @@
    - fn(SKB, LEN)[0]
    + *(u8 *)fn(SKB, LEN)

Note that the last part there converts from push(...)[0] to the
more idiomatic *(u8 *)push(...).

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2017-06-16 11:48:40 -04:00

3284 lines
88 KiB
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/*
* Copyright (c) 2008-2009 Cisco Systems, Inc. All rights reserved.
* Copyright (c) 2009 Intel Corporation. All rights reserved.
*
* 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
*/
#include <linux/types.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/list.h>
#include <linux/spinlock.h>
#include <linux/timer.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/ethtool.h>
#include <linux/if_ether.h>
#include <linux/if_vlan.h>
#include <linux/errno.h>
#include <linux/bitops.h>
#include <linux/slab.h>
#include <net/rtnetlink.h>
#include <scsi/fc/fc_els.h>
#include <scsi/fc/fc_fs.h>
#include <scsi/fc/fc_fip.h>
#include <scsi/fc/fc_encaps.h>
#include <scsi/fc/fc_fcoe.h>
#include <scsi/fc/fc_fcp.h>
#include <scsi/libfc.h>
#include <scsi/libfcoe.h>
#include "libfcoe.h"
#define FCOE_CTLR_MIN_FKA 500 /* min keep alive (mS) */
#define FCOE_CTLR_DEF_FKA FIP_DEF_FKA /* default keep alive (mS) */
static void fcoe_ctlr_timeout(unsigned long);
static void fcoe_ctlr_timer_work(struct work_struct *);
static void fcoe_ctlr_recv_work(struct work_struct *);
static int fcoe_ctlr_flogi_retry(struct fcoe_ctlr *);
static void fcoe_ctlr_vn_start(struct fcoe_ctlr *);
static int fcoe_ctlr_vn_recv(struct fcoe_ctlr *, struct sk_buff *);
static void fcoe_ctlr_vn_timeout(struct fcoe_ctlr *);
static int fcoe_ctlr_vn_lookup(struct fcoe_ctlr *, u32, u8 *);
static int fcoe_ctlr_vlan_recv(struct fcoe_ctlr *, struct sk_buff *);
static u8 fcoe_all_fcfs[ETH_ALEN] = FIP_ALL_FCF_MACS;
static u8 fcoe_all_enode[ETH_ALEN] = FIP_ALL_ENODE_MACS;
static u8 fcoe_all_vn2vn[ETH_ALEN] = FIP_ALL_VN2VN_MACS;
static u8 fcoe_all_p2p[ETH_ALEN] = FIP_ALL_P2P_MACS;
static const char * const fcoe_ctlr_states[] = {
[FIP_ST_DISABLED] = "DISABLED",
[FIP_ST_LINK_WAIT] = "LINK_WAIT",
[FIP_ST_AUTO] = "AUTO",
[FIP_ST_NON_FIP] = "NON_FIP",
[FIP_ST_ENABLED] = "ENABLED",
[FIP_ST_VNMP_START] = "VNMP_START",
[FIP_ST_VNMP_PROBE1] = "VNMP_PROBE1",
[FIP_ST_VNMP_PROBE2] = "VNMP_PROBE2",
[FIP_ST_VNMP_CLAIM] = "VNMP_CLAIM",
[FIP_ST_VNMP_UP] = "VNMP_UP",
};
static const char *fcoe_ctlr_state(enum fip_state state)
{
const char *cp = "unknown";
if (state < ARRAY_SIZE(fcoe_ctlr_states))
cp = fcoe_ctlr_states[state];
if (!cp)
cp = "unknown";
return cp;
}
/**
* fcoe_ctlr_set_state() - Set and do debug printing for the new FIP state.
* @fip: The FCoE controller
* @state: The new state
*/
static void fcoe_ctlr_set_state(struct fcoe_ctlr *fip, enum fip_state state)
{
if (state == fip->state)
return;
if (fip->lp)
LIBFCOE_FIP_DBG(fip, "state %s -> %s\n",
fcoe_ctlr_state(fip->state), fcoe_ctlr_state(state));
fip->state = state;
}
/**
* fcoe_ctlr_mtu_valid() - Check if a FCF's MTU is valid
* @fcf: The FCF to check
*
* Return non-zero if FCF fcoe_size has been validated.
*/
static inline int fcoe_ctlr_mtu_valid(const struct fcoe_fcf *fcf)
{
return (fcf->flags & FIP_FL_SOL) != 0;
}
/**
* fcoe_ctlr_fcf_usable() - Check if a FCF is usable
* @fcf: The FCF to check
*
* Return non-zero if the FCF is usable.
*/
static inline int fcoe_ctlr_fcf_usable(struct fcoe_fcf *fcf)
{
u16 flags = FIP_FL_SOL | FIP_FL_AVAIL;
return (fcf->flags & flags) == flags;
}
/**
* fcoe_ctlr_map_dest() - Set flag and OUI for mapping destination addresses
* @fip: The FCoE controller
*/
static void fcoe_ctlr_map_dest(struct fcoe_ctlr *fip)
{
if (fip->mode == FIP_MODE_VN2VN)
hton24(fip->dest_addr, FIP_VN_FC_MAP);
else
hton24(fip->dest_addr, FIP_DEF_FC_MAP);
hton24(fip->dest_addr + 3, 0);
fip->map_dest = 1;
}
/**
* fcoe_ctlr_init() - Initialize the FCoE Controller instance
* @fip: The FCoE controller to initialize
*/
void fcoe_ctlr_init(struct fcoe_ctlr *fip, enum fip_state mode)
{
fcoe_ctlr_set_state(fip, FIP_ST_LINK_WAIT);
fip->mode = mode;
fip->fip_resp = false;
INIT_LIST_HEAD(&fip->fcfs);
mutex_init(&fip->ctlr_mutex);
spin_lock_init(&fip->ctlr_lock);
fip->flogi_oxid = FC_XID_UNKNOWN;
setup_timer(&fip->timer, fcoe_ctlr_timeout, (unsigned long)fip);
INIT_WORK(&fip->timer_work, fcoe_ctlr_timer_work);
INIT_WORK(&fip->recv_work, fcoe_ctlr_recv_work);
skb_queue_head_init(&fip->fip_recv_list);
}
EXPORT_SYMBOL(fcoe_ctlr_init);
/**
* fcoe_sysfs_fcf_add() - Add a fcoe_fcf{,_device} to a fcoe_ctlr{,_device}
* @new: The newly discovered FCF
*
* Called with fip->ctlr_mutex held
*/
static int fcoe_sysfs_fcf_add(struct fcoe_fcf *new)
{
struct fcoe_ctlr *fip = new->fip;
struct fcoe_ctlr_device *ctlr_dev;
struct fcoe_fcf_device *temp, *fcf_dev;
int rc = -ENOMEM;
LIBFCOE_FIP_DBG(fip, "New FCF fab %16.16llx mac %pM\n",
new->fabric_name, new->fcf_mac);
temp = kzalloc(sizeof(*temp), GFP_KERNEL);
if (!temp)
goto out;
temp->fabric_name = new->fabric_name;
temp->switch_name = new->switch_name;
temp->fc_map = new->fc_map;
temp->vfid = new->vfid;
memcpy(temp->mac, new->fcf_mac, ETH_ALEN);
temp->priority = new->pri;
temp->fka_period = new->fka_period;
temp->selected = 0; /* default to unselected */
/*
* If ctlr_dev doesn't exist then it means we're a libfcoe user
* who doesn't use fcoe_syfs and didn't allocate a fcoe_ctlr_device.
* fnic would be an example of a driver with this behavior. In this
* case we want to add the fcoe_fcf to the fcoe_ctlr list, but we
* don't want to make sysfs changes.
*/
ctlr_dev = fcoe_ctlr_to_ctlr_dev(fip);
if (ctlr_dev) {
mutex_lock(&ctlr_dev->lock);
fcf_dev = fcoe_fcf_device_add(ctlr_dev, temp);
if (unlikely(!fcf_dev)) {
rc = -ENOMEM;
mutex_unlock(&ctlr_dev->lock);
goto out;
}
/*
* The fcoe_sysfs layer can return a CONNECTED fcf that
* has a priv (fcf was never deleted) or a CONNECTED fcf
* that doesn't have a priv (fcf was deleted). However,
* libfcoe will always delete FCFs before trying to add
* them. This is ensured because both recv_adv and
* age_fcfs are protected by the the fcoe_ctlr's mutex.
* This means that we should never get a FCF with a
* non-NULL priv pointer.
*/
BUG_ON(fcf_dev->priv);
fcf_dev->priv = new;
new->fcf_dev = fcf_dev;
mutex_unlock(&ctlr_dev->lock);
}
list_add(&new->list, &fip->fcfs);
fip->fcf_count++;
rc = 0;
out:
kfree(temp);
return rc;
}
/**
* fcoe_sysfs_fcf_del() - Remove a fcoe_fcf{,_device} to a fcoe_ctlr{,_device}
* @new: The FCF to be removed
*
* Called with fip->ctlr_mutex held
*/
static void fcoe_sysfs_fcf_del(struct fcoe_fcf *new)
{
struct fcoe_ctlr *fip = new->fip;
struct fcoe_ctlr_device *cdev;
struct fcoe_fcf_device *fcf_dev;
list_del(&new->list);
fip->fcf_count--;
/*
* If ctlr_dev doesn't exist then it means we're a libfcoe user
* who doesn't use fcoe_syfs and didn't allocate a fcoe_ctlr_device
* or a fcoe_fcf_device.
*
* fnic would be an example of a driver with this behavior. In this
* case we want to remove the fcoe_fcf from the fcoe_ctlr list (above),
* but we don't want to make sysfs changes.
*/
cdev = fcoe_ctlr_to_ctlr_dev(fip);
if (cdev) {
mutex_lock(&cdev->lock);
fcf_dev = fcoe_fcf_to_fcf_dev(new);
WARN_ON(!fcf_dev);
new->fcf_dev = NULL;
fcoe_fcf_device_delete(fcf_dev);
kfree(new);
mutex_unlock(&cdev->lock);
}
}
/**
* fcoe_ctlr_reset_fcfs() - Reset and free all FCFs for a controller
* @fip: The FCoE controller whose FCFs are to be reset
*
* Called with &fcoe_ctlr lock held.
*/
static void fcoe_ctlr_reset_fcfs(struct fcoe_ctlr *fip)
{
struct fcoe_fcf *fcf;
struct fcoe_fcf *next;
fip->sel_fcf = NULL;
list_for_each_entry_safe(fcf, next, &fip->fcfs, list) {
fcoe_sysfs_fcf_del(fcf);
}
WARN_ON(fip->fcf_count);
fip->sel_time = 0;
}
/**
* fcoe_ctlr_destroy() - Disable and tear down a FCoE controller
* @fip: The FCoE controller to tear down
*
* This is called by FCoE drivers before freeing the &fcoe_ctlr.
*
* The receive handler will have been deleted before this to guarantee
* that no more recv_work will be scheduled.
*
* The timer routine will simply return once we set FIP_ST_DISABLED.
* This guarantees that no further timeouts or work will be scheduled.
*/
void fcoe_ctlr_destroy(struct fcoe_ctlr *fip)
{
cancel_work_sync(&fip->recv_work);
skb_queue_purge(&fip->fip_recv_list);
mutex_lock(&fip->ctlr_mutex);
fcoe_ctlr_set_state(fip, FIP_ST_DISABLED);
fcoe_ctlr_reset_fcfs(fip);
mutex_unlock(&fip->ctlr_mutex);
del_timer_sync(&fip->timer);
cancel_work_sync(&fip->timer_work);
}
EXPORT_SYMBOL(fcoe_ctlr_destroy);
/**
* fcoe_ctlr_announce() - announce new FCF selection
* @fip: The FCoE controller
*
* Also sets the destination MAC for FCoE and control packets
*
* Called with neither ctlr_mutex nor ctlr_lock held.
*/
static void fcoe_ctlr_announce(struct fcoe_ctlr *fip)
{
struct fcoe_fcf *sel;
struct fcoe_fcf *fcf;
mutex_lock(&fip->ctlr_mutex);
spin_lock_bh(&fip->ctlr_lock);
kfree_skb(fip->flogi_req);
fip->flogi_req = NULL;
list_for_each_entry(fcf, &fip->fcfs, list)
fcf->flogi_sent = 0;
spin_unlock_bh(&fip->ctlr_lock);
sel = fip->sel_fcf;
if (sel && ether_addr_equal(sel->fcf_mac, fip->dest_addr))
goto unlock;
if (!is_zero_ether_addr(fip->dest_addr)) {
printk(KERN_NOTICE "libfcoe: host%d: "
"FIP Fibre-Channel Forwarder MAC %pM deselected\n",
fip->lp->host->host_no, fip->dest_addr);
memset(fip->dest_addr, 0, ETH_ALEN);
}
if (sel) {
printk(KERN_INFO "libfcoe: host%d: FIP selected "
"Fibre-Channel Forwarder MAC %pM\n",
fip->lp->host->host_no, sel->fcf_mac);
memcpy(fip->dest_addr, sel->fcoe_mac, ETH_ALEN);
fip->map_dest = 0;
}
unlock:
mutex_unlock(&fip->ctlr_mutex);
}
/**
* fcoe_ctlr_fcoe_size() - Return the maximum FCoE size required for VN_Port
* @fip: The FCoE controller to get the maximum FCoE size from
*
* Returns the maximum packet size including the FCoE header and trailer,
* but not including any Ethernet or VLAN headers.
*/
static inline u32 fcoe_ctlr_fcoe_size(struct fcoe_ctlr *fip)
{
/*
* Determine the max FCoE frame size allowed, including
* FCoE header and trailer.
* Note: lp->mfs is currently the payload size, not the frame size.
*/
return fip->lp->mfs + sizeof(struct fc_frame_header) +
sizeof(struct fcoe_hdr) + sizeof(struct fcoe_crc_eof);
}
/**
* fcoe_ctlr_solicit() - Send a FIP solicitation
* @fip: The FCoE controller to send the solicitation on
* @fcf: The destination FCF (if NULL, a multicast solicitation is sent)
*/
static void fcoe_ctlr_solicit(struct fcoe_ctlr *fip, struct fcoe_fcf *fcf)
{
struct sk_buff *skb;
struct fip_sol {
struct ethhdr eth;
struct fip_header fip;
struct {
struct fip_mac_desc mac;
struct fip_wwn_desc wwnn;
struct fip_size_desc size;
} __packed desc;
} __packed * sol;
u32 fcoe_size;
skb = dev_alloc_skb(sizeof(*sol));
if (!skb)
return;
sol = (struct fip_sol *)skb->data;
memset(sol, 0, sizeof(*sol));
memcpy(sol->eth.h_dest, fcf ? fcf->fcf_mac : fcoe_all_fcfs, ETH_ALEN);
memcpy(sol->eth.h_source, fip->ctl_src_addr, ETH_ALEN);
sol->eth.h_proto = htons(ETH_P_FIP);
sol->fip.fip_ver = FIP_VER_ENCAPS(FIP_VER);
sol->fip.fip_op = htons(FIP_OP_DISC);
sol->fip.fip_subcode = FIP_SC_SOL;
sol->fip.fip_dl_len = htons(sizeof(sol->desc) / FIP_BPW);
sol->fip.fip_flags = htons(FIP_FL_FPMA);
if (fip->spma)
sol->fip.fip_flags |= htons(FIP_FL_SPMA);
sol->desc.mac.fd_desc.fip_dtype = FIP_DT_MAC;
sol->desc.mac.fd_desc.fip_dlen = sizeof(sol->desc.mac) / FIP_BPW;
memcpy(sol->desc.mac.fd_mac, fip->ctl_src_addr, ETH_ALEN);
sol->desc.wwnn.fd_desc.fip_dtype = FIP_DT_NAME;
sol->desc.wwnn.fd_desc.fip_dlen = sizeof(sol->desc.wwnn) / FIP_BPW;
put_unaligned_be64(fip->lp->wwnn, &sol->desc.wwnn.fd_wwn);
fcoe_size = fcoe_ctlr_fcoe_size(fip);
sol->desc.size.fd_desc.fip_dtype = FIP_DT_FCOE_SIZE;
sol->desc.size.fd_desc.fip_dlen = sizeof(sol->desc.size) / FIP_BPW;
sol->desc.size.fd_size = htons(fcoe_size);
skb_put(skb, sizeof(*sol));
skb->protocol = htons(ETH_P_FIP);
skb->priority = fip->priority;
skb_reset_mac_header(skb);
skb_reset_network_header(skb);
fip->send(fip, skb);
if (!fcf)
fip->sol_time = jiffies;
}
/**
* fcoe_ctlr_link_up() - Start FCoE controller
* @fip: The FCoE controller to start
*
* Called from the LLD when the network link is ready.
*/
void fcoe_ctlr_link_up(struct fcoe_ctlr *fip)
{
mutex_lock(&fip->ctlr_mutex);
if (fip->state == FIP_ST_NON_FIP || fip->state == FIP_ST_AUTO) {
mutex_unlock(&fip->ctlr_mutex);
fc_linkup(fip->lp);
} else if (fip->state == FIP_ST_LINK_WAIT) {
fcoe_ctlr_set_state(fip, fip->mode);
switch (fip->mode) {
default:
LIBFCOE_FIP_DBG(fip, "invalid mode %d\n", fip->mode);
/* fall-through */
case FIP_MODE_AUTO:
LIBFCOE_FIP_DBG(fip, "%s", "setting AUTO mode.\n");
/* fall-through */
case FIP_MODE_FABRIC:
case FIP_MODE_NON_FIP:
mutex_unlock(&fip->ctlr_mutex);
fc_linkup(fip->lp);
fcoe_ctlr_solicit(fip, NULL);
break;
case FIP_MODE_VN2VN:
fcoe_ctlr_vn_start(fip);
mutex_unlock(&fip->ctlr_mutex);
fc_linkup(fip->lp);
break;
}
} else
mutex_unlock(&fip->ctlr_mutex);
}
EXPORT_SYMBOL(fcoe_ctlr_link_up);
/**
* fcoe_ctlr_reset() - Reset a FCoE controller
* @fip: The FCoE controller to reset
*/
static void fcoe_ctlr_reset(struct fcoe_ctlr *fip)
{
fcoe_ctlr_reset_fcfs(fip);
del_timer(&fip->timer);
fip->ctlr_ka_time = 0;
fip->port_ka_time = 0;
fip->sol_time = 0;
fip->flogi_oxid = FC_XID_UNKNOWN;
fcoe_ctlr_map_dest(fip);
}
/**
* fcoe_ctlr_link_down() - Stop a FCoE controller
* @fip: The FCoE controller to be stopped
*
* Returns non-zero if the link was up and now isn't.
*
* Called from the LLD when the network link is not ready.
* There may be multiple calls while the link is down.
*/
int fcoe_ctlr_link_down(struct fcoe_ctlr *fip)
{
int link_dropped;
LIBFCOE_FIP_DBG(fip, "link down.\n");
mutex_lock(&fip->ctlr_mutex);
fcoe_ctlr_reset(fip);
link_dropped = fip->state != FIP_ST_LINK_WAIT;
fcoe_ctlr_set_state(fip, FIP_ST_LINK_WAIT);
mutex_unlock(&fip->ctlr_mutex);
if (link_dropped)
fc_linkdown(fip->lp);
return link_dropped;
}
EXPORT_SYMBOL(fcoe_ctlr_link_down);
/**
* fcoe_ctlr_send_keep_alive() - Send a keep-alive to the selected FCF
* @fip: The FCoE controller to send the FKA on
* @lport: libfc fc_lport to send from
* @ports: 0 for controller keep-alive, 1 for port keep-alive
* @sa: The source MAC address
*
* A controller keep-alive is sent every fka_period (typically 8 seconds).
* The source MAC is the native MAC address.
*
* A port keep-alive is sent every 90 seconds while logged in.
* The source MAC is the assigned mapped source address.
* The destination is the FCF's F-port.
*/
static void fcoe_ctlr_send_keep_alive(struct fcoe_ctlr *fip,
struct fc_lport *lport,
int ports, u8 *sa)
{
struct sk_buff *skb;
struct fip_kal {
struct ethhdr eth;
struct fip_header fip;
struct fip_mac_desc mac;
} __packed * kal;
struct fip_vn_desc *vn;
u32 len;
struct fc_lport *lp;
struct fcoe_fcf *fcf;
fcf = fip->sel_fcf;
lp = fip->lp;
if (!fcf || (ports && !lp->port_id))
return;
len = sizeof(*kal) + ports * sizeof(*vn);
skb = dev_alloc_skb(len);
if (!skb)
return;
kal = (struct fip_kal *)skb->data;
memset(kal, 0, len);
memcpy(kal->eth.h_dest, fcf->fcf_mac, ETH_ALEN);
memcpy(kal->eth.h_source, sa, ETH_ALEN);
kal->eth.h_proto = htons(ETH_P_FIP);
kal->fip.fip_ver = FIP_VER_ENCAPS(FIP_VER);
kal->fip.fip_op = htons(FIP_OP_CTRL);
kal->fip.fip_subcode = FIP_SC_KEEP_ALIVE;
kal->fip.fip_dl_len = htons((sizeof(kal->mac) +
ports * sizeof(*vn)) / FIP_BPW);
kal->fip.fip_flags = htons(FIP_FL_FPMA);
if (fip->spma)
kal->fip.fip_flags |= htons(FIP_FL_SPMA);
kal->mac.fd_desc.fip_dtype = FIP_DT_MAC;
kal->mac.fd_desc.fip_dlen = sizeof(kal->mac) / FIP_BPW;
memcpy(kal->mac.fd_mac, fip->ctl_src_addr, ETH_ALEN);
if (ports) {
vn = (struct fip_vn_desc *)(kal + 1);
vn->fd_desc.fip_dtype = FIP_DT_VN_ID;
vn->fd_desc.fip_dlen = sizeof(*vn) / FIP_BPW;
memcpy(vn->fd_mac, fip->get_src_addr(lport), ETH_ALEN);
hton24(vn->fd_fc_id, lport->port_id);
put_unaligned_be64(lport->wwpn, &vn->fd_wwpn);
}
skb_put(skb, len);
skb->protocol = htons(ETH_P_FIP);
skb->priority = fip->priority;
skb_reset_mac_header(skb);
skb_reset_network_header(skb);
fip->send(fip, skb);
}
/**
* fcoe_ctlr_encaps() - Encapsulate an ELS frame for FIP, without sending it
* @fip: The FCoE controller for the ELS frame
* @dtype: The FIP descriptor type for the frame
* @skb: The FCoE ELS frame including FC header but no FCoE headers
* @d_id: The destination port ID.
*
* Returns non-zero error code on failure.
*
* The caller must check that the length is a multiple of 4.
*
* The @skb must have enough headroom (28 bytes) and tailroom (8 bytes).
* Headroom includes the FIP encapsulation description, FIP header, and
* Ethernet header. The tailroom is for the FIP MAC descriptor.
*/
static int fcoe_ctlr_encaps(struct fcoe_ctlr *fip, struct fc_lport *lport,
u8 dtype, struct sk_buff *skb, u32 d_id)
{
struct fip_encaps_head {
struct ethhdr eth;
struct fip_header fip;
struct fip_encaps encaps;
} __packed * cap;
struct fc_frame_header *fh;
struct fip_mac_desc *mac;
struct fcoe_fcf *fcf;
size_t dlen;
u16 fip_flags;
u8 op;
fh = (struct fc_frame_header *)skb->data;
op = *(u8 *)(fh + 1);
dlen = sizeof(struct fip_encaps) + skb->len; /* len before push */
cap = skb_push(skb, sizeof(*cap));
memset(cap, 0, sizeof(*cap));
if (lport->point_to_multipoint) {
if (fcoe_ctlr_vn_lookup(fip, d_id, cap->eth.h_dest))
return -ENODEV;
fip_flags = 0;
} else {
fcf = fip->sel_fcf;
if (!fcf)
return -ENODEV;
fip_flags = fcf->flags;
fip_flags &= fip->spma ? FIP_FL_SPMA | FIP_FL_FPMA :
FIP_FL_FPMA;
if (!fip_flags)
return -ENODEV;
memcpy(cap->eth.h_dest, fcf->fcf_mac, ETH_ALEN);
}
memcpy(cap->eth.h_source, fip->ctl_src_addr, ETH_ALEN);
cap->eth.h_proto = htons(ETH_P_FIP);
cap->fip.fip_ver = FIP_VER_ENCAPS(FIP_VER);
cap->fip.fip_op = htons(FIP_OP_LS);
if (op == ELS_LS_ACC || op == ELS_LS_RJT)
cap->fip.fip_subcode = FIP_SC_REP;
else
cap->fip.fip_subcode = FIP_SC_REQ;
cap->fip.fip_flags = htons(fip_flags);
cap->encaps.fd_desc.fip_dtype = dtype;
cap->encaps.fd_desc.fip_dlen = dlen / FIP_BPW;
if (op != ELS_LS_RJT) {
dlen += sizeof(*mac);
mac = skb_put_zero(skb, sizeof(*mac));
mac->fd_desc.fip_dtype = FIP_DT_MAC;
mac->fd_desc.fip_dlen = sizeof(*mac) / FIP_BPW;
if (dtype != FIP_DT_FLOGI && dtype != FIP_DT_FDISC) {
memcpy(mac->fd_mac, fip->get_src_addr(lport), ETH_ALEN);
} else if (fip->mode == FIP_MODE_VN2VN) {
hton24(mac->fd_mac, FIP_VN_FC_MAP);
hton24(mac->fd_mac + 3, fip->port_id);
} else if (fip_flags & FIP_FL_SPMA) {
LIBFCOE_FIP_DBG(fip, "FLOGI/FDISC sent with SPMA\n");
memcpy(mac->fd_mac, fip->ctl_src_addr, ETH_ALEN);
} else {
LIBFCOE_FIP_DBG(fip, "FLOGI/FDISC sent with FPMA\n");
/* FPMA only FLOGI. Must leave the MAC desc zeroed. */
}
}
cap->fip.fip_dl_len = htons(dlen / FIP_BPW);
skb->protocol = htons(ETH_P_FIP);
skb->priority = fip->priority;
skb_reset_mac_header(skb);
skb_reset_network_header(skb);
return 0;
}
/**
* fcoe_ctlr_els_send() - Send an ELS frame encapsulated by FIP if appropriate.
* @fip: FCoE controller.
* @lport: libfc fc_lport to send from
* @skb: FCoE ELS frame including FC header but no FCoE headers.
*
* Returns a non-zero error code if the frame should not be sent.
* Returns zero if the caller should send the frame with FCoE encapsulation.
*
* The caller must check that the length is a multiple of 4.
* The SKB must have enough headroom (28 bytes) and tailroom (8 bytes).
* The the skb must also be an fc_frame.
*
* This is called from the lower-level driver with spinlocks held,
* so we must not take a mutex here.
*/
int fcoe_ctlr_els_send(struct fcoe_ctlr *fip, struct fc_lport *lport,
struct sk_buff *skb)
{
struct fc_frame *fp;
struct fc_frame_header *fh;
u16 old_xid;
u8 op;
u8 mac[ETH_ALEN];
fp = container_of(skb, struct fc_frame, skb);
fh = (struct fc_frame_header *)skb->data;
op = *(u8 *)(fh + 1);
if (op == ELS_FLOGI && fip->mode != FIP_MODE_VN2VN) {
old_xid = fip->flogi_oxid;
fip->flogi_oxid = ntohs(fh->fh_ox_id);
if (fip->state == FIP_ST_AUTO) {
if (old_xid == FC_XID_UNKNOWN)
fip->flogi_count = 0;
fip->flogi_count++;
if (fip->flogi_count < 3)
goto drop;
fcoe_ctlr_map_dest(fip);
return 0;
}
if (fip->state == FIP_ST_NON_FIP)
fcoe_ctlr_map_dest(fip);
}
if (fip->state == FIP_ST_NON_FIP)
return 0;
if (!fip->sel_fcf && fip->mode != FIP_MODE_VN2VN)
goto drop;
switch (op) {
case ELS_FLOGI:
op = FIP_DT_FLOGI;
if (fip->mode == FIP_MODE_VN2VN)
break;
spin_lock_bh(&fip->ctlr_lock);
kfree_skb(fip->flogi_req);
fip->flogi_req = skb;
fip->flogi_req_send = 1;
spin_unlock_bh(&fip->ctlr_lock);
schedule_work(&fip->timer_work);
return -EINPROGRESS;
case ELS_FDISC:
if (ntoh24(fh->fh_s_id))
return 0;
op = FIP_DT_FDISC;
break;
case ELS_LOGO:
if (fip->mode == FIP_MODE_VN2VN) {
if (fip->state != FIP_ST_VNMP_UP)
return -EINVAL;
if (ntoh24(fh->fh_d_id) == FC_FID_FLOGI)
return -EINVAL;
} else {
if (fip->state != FIP_ST_ENABLED)
return 0;
if (ntoh24(fh->fh_d_id) != FC_FID_FLOGI)
return 0;
}
op = FIP_DT_LOGO;
break;
case ELS_LS_ACC:
/*
* If non-FIP, we may have gotten an SID by accepting an FLOGI
* from a point-to-point connection. Switch to using
* the source mac based on the SID. The destination
* MAC in this case would have been set by receiving the
* FLOGI.
*/
if (fip->state == FIP_ST_NON_FIP) {
if (fip->flogi_oxid == FC_XID_UNKNOWN)
return 0;
fip->flogi_oxid = FC_XID_UNKNOWN;
fc_fcoe_set_mac(mac, fh->fh_d_id);
fip->update_mac(lport, mac);
}
/* fall through */
case ELS_LS_RJT:
op = fr_encaps(fp);
if (op)
break;
return 0;
default:
if (fip->state != FIP_ST_ENABLED &&
fip->state != FIP_ST_VNMP_UP)
goto drop;
return 0;
}
LIBFCOE_FIP_DBG(fip, "els_send op %u d_id %x\n",
op, ntoh24(fh->fh_d_id));
if (fcoe_ctlr_encaps(fip, lport, op, skb, ntoh24(fh->fh_d_id)))
goto drop;
fip->send(fip, skb);
return -EINPROGRESS;
drop:
kfree_skb(skb);
LIBFCOE_FIP_DBG(fip, "drop els_send op %u d_id %x\n",
op, ntoh24(fh->fh_d_id));
return -EINVAL;
}
EXPORT_SYMBOL(fcoe_ctlr_els_send);
/**
* fcoe_ctlr_age_fcfs() - Reset and free all old FCFs for a controller
* @fip: The FCoE controller to free FCFs on
*
* Called with lock held and preemption disabled.
*
* An FCF is considered old if we have missed two advertisements.
* That is, there have been no valid advertisement from it for 2.5
* times its keep-alive period.
*
* In addition, determine the time when an FCF selection can occur.
*
* Also, increment the MissDiscAdvCount when no advertisement is received
* for the corresponding FCF for 1.5 * FKA_ADV_PERIOD (FC-BB-5 LESB).
*
* Returns the time in jiffies for the next call.
*/
static unsigned long fcoe_ctlr_age_fcfs(struct fcoe_ctlr *fip)
{
struct fcoe_fcf *fcf;
struct fcoe_fcf *next;
unsigned long next_timer = jiffies + msecs_to_jiffies(FIP_VN_KA_PERIOD);
unsigned long deadline;
unsigned long sel_time = 0;
struct list_head del_list;
struct fc_stats *stats;
INIT_LIST_HEAD(&del_list);
stats = per_cpu_ptr(fip->lp->stats, get_cpu());
list_for_each_entry_safe(fcf, next, &fip->fcfs, list) {
deadline = fcf->time + fcf->fka_period + fcf->fka_period / 2;
if (fip->sel_fcf == fcf) {
if (time_after(jiffies, deadline)) {
stats->MissDiscAdvCount++;
printk(KERN_INFO "libfcoe: host%d: "
"Missing Discovery Advertisement "
"for fab %16.16llx count %lld\n",
fip->lp->host->host_no, fcf->fabric_name,
stats->MissDiscAdvCount);
} else if (time_after(next_timer, deadline))
next_timer = deadline;
}
deadline += fcf->fka_period;
if (time_after_eq(jiffies, deadline)) {
if (fip->sel_fcf == fcf)
fip->sel_fcf = NULL;
/*
* Move to delete list so we can call
* fcoe_sysfs_fcf_del (which can sleep)
* after the put_cpu().
*/
list_del(&fcf->list);
list_add(&fcf->list, &del_list);
stats->VLinkFailureCount++;
} else {
if (time_after(next_timer, deadline))
next_timer = deadline;
if (fcoe_ctlr_mtu_valid(fcf) &&
(!sel_time || time_before(sel_time, fcf->time)))
sel_time = fcf->time;
}
}
put_cpu();
list_for_each_entry_safe(fcf, next, &del_list, list) {
/* Removes fcf from current list */
fcoe_sysfs_fcf_del(fcf);
}
if (sel_time && !fip->sel_fcf && !fip->sel_time) {
sel_time += msecs_to_jiffies(FCOE_CTLR_START_DELAY);
fip->sel_time = sel_time;
}
return next_timer;
}
/**
* fcoe_ctlr_parse_adv() - Decode a FIP advertisement into a new FCF entry
* @fip: The FCoE controller receiving the advertisement
* @skb: The received FIP advertisement frame
* @fcf: The resulting FCF entry
*
* Returns zero on a valid parsed advertisement,
* otherwise returns non zero value.
*/
static int fcoe_ctlr_parse_adv(struct fcoe_ctlr *fip,
struct sk_buff *skb, struct fcoe_fcf *fcf)
{
struct fip_header *fiph;
struct fip_desc *desc = NULL;
struct fip_wwn_desc *wwn;
struct fip_fab_desc *fab;
struct fip_fka_desc *fka;
unsigned long t;
size_t rlen;
size_t dlen;
u32 desc_mask;
memset(fcf, 0, sizeof(*fcf));
fcf->fka_period = msecs_to_jiffies(FCOE_CTLR_DEF_FKA);
fiph = (struct fip_header *)skb->data;
fcf->flags = ntohs(fiph->fip_flags);
/*
* mask of required descriptors. validating each one clears its bit.
*/
desc_mask = BIT(FIP_DT_PRI) | BIT(FIP_DT_MAC) | BIT(FIP_DT_NAME) |
BIT(FIP_DT_FAB) | BIT(FIP_DT_FKA);
rlen = ntohs(fiph->fip_dl_len) * 4;
if (rlen + sizeof(*fiph) > skb->len)
return -EINVAL;
desc = (struct fip_desc *)(fiph + 1);
while (rlen > 0) {
dlen = desc->fip_dlen * FIP_BPW;
if (dlen < sizeof(*desc) || dlen > rlen)
return -EINVAL;
/* Drop Adv if there are duplicate critical descriptors */
if ((desc->fip_dtype < 32) &&
!(desc_mask & 1U << desc->fip_dtype)) {
LIBFCOE_FIP_DBG(fip, "Duplicate Critical "
"Descriptors in FIP adv\n");
return -EINVAL;
}
switch (desc->fip_dtype) {
case FIP_DT_PRI:
if (dlen != sizeof(struct fip_pri_desc))
goto len_err;
fcf->pri = ((struct fip_pri_desc *)desc)->fd_pri;
desc_mask &= ~BIT(FIP_DT_PRI);
break;
case FIP_DT_MAC:
if (dlen != sizeof(struct fip_mac_desc))
goto len_err;
memcpy(fcf->fcf_mac,
((struct fip_mac_desc *)desc)->fd_mac,
ETH_ALEN);
memcpy(fcf->fcoe_mac, fcf->fcf_mac, ETH_ALEN);
if (!is_valid_ether_addr(fcf->fcf_mac)) {
LIBFCOE_FIP_DBG(fip,
"Invalid MAC addr %pM in FIP adv\n",
fcf->fcf_mac);
return -EINVAL;
}
desc_mask &= ~BIT(FIP_DT_MAC);
break;
case FIP_DT_NAME:
if (dlen != sizeof(struct fip_wwn_desc))
goto len_err;
wwn = (struct fip_wwn_desc *)desc;
fcf->switch_name = get_unaligned_be64(&wwn->fd_wwn);
desc_mask &= ~BIT(FIP_DT_NAME);
break;
case FIP_DT_FAB:
if (dlen != sizeof(struct fip_fab_desc))
goto len_err;
fab = (struct fip_fab_desc *)desc;
fcf->fabric_name = get_unaligned_be64(&fab->fd_wwn);
fcf->vfid = ntohs(fab->fd_vfid);
fcf->fc_map = ntoh24(fab->fd_map);
desc_mask &= ~BIT(FIP_DT_FAB);
break;
case FIP_DT_FKA:
if (dlen != sizeof(struct fip_fka_desc))
goto len_err;
fka = (struct fip_fka_desc *)desc;
if (fka->fd_flags & FIP_FKA_ADV_D)
fcf->fd_flags = 1;
t = ntohl(fka->fd_fka_period);
if (t >= FCOE_CTLR_MIN_FKA)
fcf->fka_period = msecs_to_jiffies(t);
desc_mask &= ~BIT(FIP_DT_FKA);
break;
case FIP_DT_MAP_OUI:
case FIP_DT_FCOE_SIZE:
case FIP_DT_FLOGI:
case FIP_DT_FDISC:
case FIP_DT_LOGO:
case FIP_DT_ELP:
default:
LIBFCOE_FIP_DBG(fip, "unexpected descriptor type %x "
"in FIP adv\n", desc->fip_dtype);
/* standard says ignore unknown descriptors >= 128 */
if (desc->fip_dtype < FIP_DT_NON_CRITICAL)
return -EINVAL;
break;
}
desc = (struct fip_desc *)((char *)desc + dlen);
rlen -= dlen;
}
if (!fcf->fc_map || (fcf->fc_map & 0x10000))
return -EINVAL;
if (!fcf->switch_name)
return -EINVAL;
if (desc_mask) {
LIBFCOE_FIP_DBG(fip, "adv missing descriptors mask %x\n",
desc_mask);
return -EINVAL;
}
return 0;
len_err:
LIBFCOE_FIP_DBG(fip, "FIP length error in descriptor type %x len %zu\n",
desc->fip_dtype, dlen);
return -EINVAL;
}
/**
* fcoe_ctlr_recv_adv() - Handle an incoming advertisement
* @fip: The FCoE controller receiving the advertisement
* @skb: The received FIP packet
*/
static void fcoe_ctlr_recv_adv(struct fcoe_ctlr *fip, struct sk_buff *skb)
{
struct fcoe_fcf *fcf;
struct fcoe_fcf new;
unsigned long sol_tov = msecs_to_jiffies(FCOE_CTRL_SOL_TOV);
int first = 0;
int mtu_valid;
int found = 0;
int rc = 0;
if (fcoe_ctlr_parse_adv(fip, skb, &new))
return;
mutex_lock(&fip->ctlr_mutex);
first = list_empty(&fip->fcfs);
list_for_each_entry(fcf, &fip->fcfs, list) {
if (fcf->switch_name == new.switch_name &&
fcf->fabric_name == new.fabric_name &&
fcf->fc_map == new.fc_map &&
ether_addr_equal(fcf->fcf_mac, new.fcf_mac)) {
found = 1;
break;
}
}
if (!found) {
if (fip->fcf_count >= FCOE_CTLR_FCF_LIMIT)
goto out;
fcf = kmalloc(sizeof(*fcf), GFP_ATOMIC);
if (!fcf)
goto out;
memcpy(fcf, &new, sizeof(new));
fcf->fip = fip;
rc = fcoe_sysfs_fcf_add(fcf);
if (rc) {
printk(KERN_ERR "Failed to allocate sysfs instance "
"for FCF, fab %16.16llx mac %pM\n",
new.fabric_name, new.fcf_mac);
kfree(fcf);
goto out;
}
} else {
/*
* Update the FCF's keep-alive descriptor flags.
* Other flag changes from new advertisements are
* ignored after a solicited advertisement is
* received and the FCF is selectable (usable).
*/
fcf->fd_flags = new.fd_flags;
if (!fcoe_ctlr_fcf_usable(fcf))
fcf->flags = new.flags;
if (fcf == fip->sel_fcf && !fcf->fd_flags) {
fip->ctlr_ka_time -= fcf->fka_period;
fip->ctlr_ka_time += new.fka_period;
if (time_before(fip->ctlr_ka_time, fip->timer.expires))
mod_timer(&fip->timer, fip->ctlr_ka_time);
}
fcf->fka_period = new.fka_period;
memcpy(fcf->fcf_mac, new.fcf_mac, ETH_ALEN);
}
mtu_valid = fcoe_ctlr_mtu_valid(fcf);
fcf->time = jiffies;
if (!found)
LIBFCOE_FIP_DBG(fip, "New FCF fab %16.16llx mac %pM\n",
fcf->fabric_name, fcf->fcf_mac);
/*
* If this advertisement is not solicited and our max receive size
* hasn't been verified, send a solicited advertisement.
*/
if (!mtu_valid)
fcoe_ctlr_solicit(fip, fcf);
/*
* If its been a while since we did a solicit, and this is
* the first advertisement we've received, do a multicast
* solicitation to gather as many advertisements as we can
* before selection occurs.
*/
if (first && time_after(jiffies, fip->sol_time + sol_tov))
fcoe_ctlr_solicit(fip, NULL);
/*
* Put this FCF at the head of the list for priority among equals.
* This helps in the case of an NPV switch which insists we use
* the FCF that answers multicast solicitations, not the others that
* are sending periodic multicast advertisements.
*/
if (mtu_valid)
list_move(&fcf->list, &fip->fcfs);
/*
* If this is the first validated FCF, note the time and
* set a timer to trigger selection.
*/
if (mtu_valid && !fip->sel_fcf && !fip->sel_time &&
fcoe_ctlr_fcf_usable(fcf)) {
fip->sel_time = jiffies +
msecs_to_jiffies(FCOE_CTLR_START_DELAY);
if (!timer_pending(&fip->timer) ||
time_before(fip->sel_time, fip->timer.expires))
mod_timer(&fip->timer, fip->sel_time);
}
out:
mutex_unlock(&fip->ctlr_mutex);
}
/**
* fcoe_ctlr_recv_els() - Handle an incoming FIP encapsulated ELS frame
* @fip: The FCoE controller which received the packet
* @skb: The received FIP packet
*/
static void fcoe_ctlr_recv_els(struct fcoe_ctlr *fip, struct sk_buff *skb)
{
struct fc_lport *lport = fip->lp;
struct fip_header *fiph;
struct fc_frame *fp = (struct fc_frame *)skb;
struct fc_frame_header *fh = NULL;
struct fip_desc *desc;
struct fip_encaps *els;
struct fcoe_fcf *sel;
struct fc_stats *stats;
enum fip_desc_type els_dtype = 0;
u8 els_op;
u8 sub;
u8 granted_mac[ETH_ALEN] = { 0 };
size_t els_len = 0;
size_t rlen;
size_t dlen;
u32 desc_mask = 0;
u32 desc_cnt = 0;
fiph = (struct fip_header *)skb->data;
sub = fiph->fip_subcode;
if (sub != FIP_SC_REQ && sub != FIP_SC_REP)
goto drop;
rlen = ntohs(fiph->fip_dl_len) * 4;
if (rlen + sizeof(*fiph) > skb->len)
goto drop;
desc = (struct fip_desc *)(fiph + 1);
while (rlen > 0) {
desc_cnt++;
dlen = desc->fip_dlen * FIP_BPW;
if (dlen < sizeof(*desc) || dlen > rlen)
goto drop;
/* Drop ELS if there are duplicate critical descriptors */
if (desc->fip_dtype < 32) {
if ((desc->fip_dtype != FIP_DT_MAC) &&
(desc_mask & 1U << desc->fip_dtype)) {
LIBFCOE_FIP_DBG(fip, "Duplicate Critical "
"Descriptors in FIP ELS\n");
goto drop;
}
desc_mask |= (1 << desc->fip_dtype);
}
switch (desc->fip_dtype) {
case FIP_DT_MAC:
sel = fip->sel_fcf;
if (desc_cnt == 1) {
LIBFCOE_FIP_DBG(fip, "FIP descriptors "
"received out of order\n");
goto drop;
}
/*
* Some switch implementations send two MAC descriptors,
* with first MAC(granted_mac) being the FPMA, and the
* second one(fcoe_mac) is used as destination address
* for sending/receiving FCoE packets. FIP traffic is
* sent using fip_mac. For regular switches, both
* fip_mac and fcoe_mac would be the same.
*/
if (desc_cnt == 2)
memcpy(granted_mac,
((struct fip_mac_desc *)desc)->fd_mac,
ETH_ALEN);
if (dlen != sizeof(struct fip_mac_desc))
goto len_err;
if ((desc_cnt == 3) && (sel))
memcpy(sel->fcoe_mac,
((struct fip_mac_desc *)desc)->fd_mac,
ETH_ALEN);
break;
case FIP_DT_FLOGI:
case FIP_DT_FDISC:
case FIP_DT_LOGO:
case FIP_DT_ELP:
if (desc_cnt != 1) {
LIBFCOE_FIP_DBG(fip, "FIP descriptors "
"received out of order\n");
goto drop;
}
if (fh)
goto drop;
if (dlen < sizeof(*els) + sizeof(*fh) + 1)
goto len_err;
els_len = dlen - sizeof(*els);
els = (struct fip_encaps *)desc;
fh = (struct fc_frame_header *)(els + 1);
els_dtype = desc->fip_dtype;
break;
default:
LIBFCOE_FIP_DBG(fip, "unexpected descriptor type %x "
"in FIP adv\n", desc->fip_dtype);
/* standard says ignore unknown descriptors >= 128 */
if (desc->fip_dtype < FIP_DT_NON_CRITICAL)
goto drop;
if (desc_cnt <= 2) {
LIBFCOE_FIP_DBG(fip, "FIP descriptors "
"received out of order\n");
goto drop;
}
break;
}
desc = (struct fip_desc *)((char *)desc + dlen);
rlen -= dlen;
}
if (!fh)
goto drop;
els_op = *(u8 *)(fh + 1);
if ((els_dtype == FIP_DT_FLOGI || els_dtype == FIP_DT_FDISC) &&
sub == FIP_SC_REP && fip->mode != FIP_MODE_VN2VN) {
if (els_op == ELS_LS_ACC) {
if (!is_valid_ether_addr(granted_mac)) {
LIBFCOE_FIP_DBG(fip,
"Invalid MAC address %pM in FIP ELS\n",
granted_mac);
goto drop;
}
memcpy(fr_cb(fp)->granted_mac, granted_mac, ETH_ALEN);
if (fip->flogi_oxid == ntohs(fh->fh_ox_id)) {
fip->flogi_oxid = FC_XID_UNKNOWN;
if (els_dtype == FIP_DT_FLOGI)
fcoe_ctlr_announce(fip);
}
} else if (els_dtype == FIP_DT_FLOGI &&
!fcoe_ctlr_flogi_retry(fip))
goto drop; /* retrying FLOGI so drop reject */
}
if ((desc_cnt == 0) || ((els_op != ELS_LS_RJT) &&
(!(1U << FIP_DT_MAC & desc_mask)))) {
LIBFCOE_FIP_DBG(fip, "Missing critical descriptors "
"in FIP ELS\n");
goto drop;
}
/*
* Convert skb into an fc_frame containing only the ELS.
*/
skb_pull(skb, (u8 *)fh - skb->data);
skb_trim(skb, els_len);
fp = (struct fc_frame *)skb;
fc_frame_init(fp);
fr_sof(fp) = FC_SOF_I3;
fr_eof(fp) = FC_EOF_T;
fr_dev(fp) = lport;
fr_encaps(fp) = els_dtype;
stats = per_cpu_ptr(lport->stats, get_cpu());
stats->RxFrames++;
stats->RxWords += skb->len / FIP_BPW;
put_cpu();
fc_exch_recv(lport, fp);
return;
len_err:
LIBFCOE_FIP_DBG(fip, "FIP length error in descriptor type %x len %zu\n",
desc->fip_dtype, dlen);
drop:
kfree_skb(skb);
}
/**
* fcoe_ctlr_recv_els() - Handle an incoming link reset frame
* @fip: The FCoE controller that received the frame
* @fh: The received FIP header
*
* There may be multiple VN_Port descriptors.
* The overall length has already been checked.
*/
static void fcoe_ctlr_recv_clr_vlink(struct fcoe_ctlr *fip,
struct sk_buff *skb)
{
struct fip_desc *desc;
struct fip_mac_desc *mp;
struct fip_wwn_desc *wp;
struct fip_vn_desc *vp;
size_t rlen;
size_t dlen;
struct fcoe_fcf *fcf = fip->sel_fcf;
struct fc_lport *lport = fip->lp;
struct fc_lport *vn_port = NULL;
u32 desc_mask;
int num_vlink_desc;
int reset_phys_port = 0;
struct fip_vn_desc **vlink_desc_arr = NULL;
struct fip_header *fh = (struct fip_header *)skb->data;
struct ethhdr *eh = eth_hdr(skb);
LIBFCOE_FIP_DBG(fip, "Clear Virtual Link received\n");
if (!fcf) {
/*
* We are yet to select best FCF, but we got CVL in the
* meantime. reset the ctlr and let it rediscover the FCF
*/
LIBFCOE_FIP_DBG(fip, "Resetting fcoe_ctlr as FCF has not been "
"selected yet\n");
mutex_lock(&fip->ctlr_mutex);
fcoe_ctlr_reset(fip);
mutex_unlock(&fip->ctlr_mutex);
return;
}
/*
* If we've selected an FCF check that the CVL is from there to avoid
* processing CVLs from an unexpected source. If it is from an
* unexpected source drop it on the floor.
*/
if (!ether_addr_equal(eh->h_source, fcf->fcf_mac)) {
LIBFCOE_FIP_DBG(fip, "Dropping CVL due to source address "
"mismatch with FCF src=%pM\n", eh->h_source);
return;
}
/*
* If we haven't logged into the fabric but receive a CVL we should
* reset everything and go back to solicitation.
*/
if (!lport->port_id) {
LIBFCOE_FIP_DBG(fip, "lport not logged in, resoliciting\n");
mutex_lock(&fip->ctlr_mutex);
fcoe_ctlr_reset(fip);
mutex_unlock(&fip->ctlr_mutex);
fc_lport_reset(fip->lp);
fcoe_ctlr_solicit(fip, NULL);
return;
}
/*
* mask of required descriptors. Validating each one clears its bit.
*/
desc_mask = BIT(FIP_DT_MAC) | BIT(FIP_DT_NAME);
rlen = ntohs(fh->fip_dl_len) * FIP_BPW;
desc = (struct fip_desc *)(fh + 1);
/*
* Actually need to subtract 'sizeof(*mp) - sizeof(*wp)' from 'rlen'
* before determining max Vx_Port descriptor but a buggy FCF could have
* omitted either or both MAC Address and Name Identifier descriptors
*/
num_vlink_desc = rlen / sizeof(*vp);
if (num_vlink_desc)
vlink_desc_arr = kmalloc(sizeof(vp) * num_vlink_desc,
GFP_ATOMIC);
if (!vlink_desc_arr)
return;
num_vlink_desc = 0;
while (rlen >= sizeof(*desc)) {
dlen = desc->fip_dlen * FIP_BPW;
if (dlen > rlen)
goto err;
/* Drop CVL if there are duplicate critical descriptors */
if ((desc->fip_dtype < 32) &&
(desc->fip_dtype != FIP_DT_VN_ID) &&
!(desc_mask & 1U << desc->fip_dtype)) {
LIBFCOE_FIP_DBG(fip, "Duplicate Critical "
"Descriptors in FIP CVL\n");
goto err;
}
switch (desc->fip_dtype) {
case FIP_DT_MAC:
mp = (struct fip_mac_desc *)desc;
if (dlen < sizeof(*mp))
goto err;
if (!ether_addr_equal(mp->fd_mac, fcf->fcf_mac))
goto err;
desc_mask &= ~BIT(FIP_DT_MAC);
break;
case FIP_DT_NAME:
wp = (struct fip_wwn_desc *)desc;
if (dlen < sizeof(*wp))
goto err;
if (get_unaligned_be64(&wp->fd_wwn) != fcf->switch_name)
goto err;
desc_mask &= ~BIT(FIP_DT_NAME);
break;
case FIP_DT_VN_ID:
vp = (struct fip_vn_desc *)desc;
if (dlen < sizeof(*vp))
goto err;
vlink_desc_arr[num_vlink_desc++] = vp;
vn_port = fc_vport_id_lookup(lport,
ntoh24(vp->fd_fc_id));
if (vn_port && (vn_port == lport)) {
mutex_lock(&fip->ctlr_mutex);
per_cpu_ptr(lport->stats,
get_cpu())->VLinkFailureCount++;
put_cpu();
fcoe_ctlr_reset(fip);
mutex_unlock(&fip->ctlr_mutex);
}
break;
default:
/* standard says ignore unknown descriptors >= 128 */
if (desc->fip_dtype < FIP_DT_NON_CRITICAL)
goto err;
break;
}
desc = (struct fip_desc *)((char *)desc + dlen);
rlen -= dlen;
}
/*
* reset only if all required descriptors were present and valid.
*/
if (desc_mask)
LIBFCOE_FIP_DBG(fip, "missing descriptors mask %x\n",
desc_mask);
else if (!num_vlink_desc) {
LIBFCOE_FIP_DBG(fip, "CVL: no Vx_Port descriptor found\n");
/*
* No Vx_Port description. Clear all NPIV ports,
* followed by physical port
*/
mutex_lock(&fip->ctlr_mutex);
per_cpu_ptr(lport->stats, get_cpu())->VLinkFailureCount++;
put_cpu();
fcoe_ctlr_reset(fip);
mutex_unlock(&fip->ctlr_mutex);
mutex_lock(&lport->lp_mutex);
list_for_each_entry(vn_port, &lport->vports, list)
fc_lport_reset(vn_port);
mutex_unlock(&lport->lp_mutex);
fc_lport_reset(fip->lp);
fcoe_ctlr_solicit(fip, NULL);
} else {
int i;
LIBFCOE_FIP_DBG(fip, "performing Clear Virtual Link\n");
for (i = 0; i < num_vlink_desc; i++) {
vp = vlink_desc_arr[i];
vn_port = fc_vport_id_lookup(lport,
ntoh24(vp->fd_fc_id));
if (!vn_port)
continue;
/*
* 'port_id' is already validated, check MAC address and
* wwpn
*/
if (!ether_addr_equal(fip->get_src_addr(vn_port),
vp->fd_mac) ||
get_unaligned_be64(&vp->fd_wwpn) !=
vn_port->wwpn)
continue;
if (vn_port == lport)
/*
* Physical port, defer processing till all
* listed NPIV ports are cleared
*/
reset_phys_port = 1;
else /* NPIV port */
fc_lport_reset(vn_port);
}
if (reset_phys_port) {
fc_lport_reset(fip->lp);
fcoe_ctlr_solicit(fip, NULL);
}
}
err:
kfree(vlink_desc_arr);
}
/**
* fcoe_ctlr_recv() - Receive a FIP packet
* @fip: The FCoE controller that received the packet
* @skb: The received FIP packet
*
* This may be called from either NET_RX_SOFTIRQ or IRQ.
*/
void fcoe_ctlr_recv(struct fcoe_ctlr *fip, struct sk_buff *skb)
{
skb = skb_share_check(skb, GFP_ATOMIC);
if (!skb)
return;
skb_queue_tail(&fip->fip_recv_list, skb);
schedule_work(&fip->recv_work);
}
EXPORT_SYMBOL(fcoe_ctlr_recv);
/**
* fcoe_ctlr_recv_handler() - Receive a FIP frame
* @fip: The FCoE controller that received the frame
* @skb: The received FIP frame
*
* Returns non-zero if the frame is dropped.
*/
static int fcoe_ctlr_recv_handler(struct fcoe_ctlr *fip, struct sk_buff *skb)
{
struct fip_header *fiph;
struct ethhdr *eh;
enum fip_state state;
bool fip_vlan_resp = false;
u16 op;
u8 sub;
if (skb_linearize(skb))
goto drop;
if (skb->len < sizeof(*fiph))
goto drop;
eh = eth_hdr(skb);
if (fip->mode == FIP_MODE_VN2VN) {
if (!ether_addr_equal(eh->h_dest, fip->ctl_src_addr) &&
!ether_addr_equal(eh->h_dest, fcoe_all_vn2vn) &&
!ether_addr_equal(eh->h_dest, fcoe_all_p2p))
goto drop;
} else if (!ether_addr_equal(eh->h_dest, fip->ctl_src_addr) &&
!ether_addr_equal(eh->h_dest, fcoe_all_enode))
goto drop;
fiph = (struct fip_header *)skb->data;
op = ntohs(fiph->fip_op);
sub = fiph->fip_subcode;
if (FIP_VER_DECAPS(fiph->fip_ver) != FIP_VER)
goto drop;
if (ntohs(fiph->fip_dl_len) * FIP_BPW + sizeof(*fiph) > skb->len)
goto drop;
mutex_lock(&fip->ctlr_mutex);
state = fip->state;
if (state == FIP_ST_AUTO) {
fip->map_dest = 0;
fcoe_ctlr_set_state(fip, FIP_ST_ENABLED);
state = FIP_ST_ENABLED;
LIBFCOE_FIP_DBG(fip, "Using FIP mode\n");
}
fip_vlan_resp = fip->fip_resp;
mutex_unlock(&fip->ctlr_mutex);
if (fip->mode == FIP_MODE_VN2VN && op == FIP_OP_VN2VN)
return fcoe_ctlr_vn_recv(fip, skb);
if (fip_vlan_resp && op == FIP_OP_VLAN) {
LIBFCOE_FIP_DBG(fip, "fip vlan discovery\n");
return fcoe_ctlr_vlan_recv(fip, skb);
}
if (state != FIP_ST_ENABLED && state != FIP_ST_VNMP_UP &&
state != FIP_ST_VNMP_CLAIM)
goto drop;
if (op == FIP_OP_LS) {
fcoe_ctlr_recv_els(fip, skb); /* consumes skb */
return 0;
}
if (state != FIP_ST_ENABLED)
goto drop;
if (op == FIP_OP_DISC && sub == FIP_SC_ADV)
fcoe_ctlr_recv_adv(fip, skb);
else if (op == FIP_OP_CTRL && sub == FIP_SC_CLR_VLINK)
fcoe_ctlr_recv_clr_vlink(fip, skb);
kfree_skb(skb);
return 0;
drop:
kfree_skb(skb);
return -1;
}
/**
* fcoe_ctlr_select() - Select the best FCF (if possible)
* @fip: The FCoE controller
*
* Returns the selected FCF, or NULL if none are usable.
*
* If there are conflicting advertisements, no FCF can be chosen.
*
* If there is already a selected FCF, this will choose a better one or
* an equivalent one that hasn't already been sent a FLOGI.
*
* Called with lock held.
*/
static struct fcoe_fcf *fcoe_ctlr_select(struct fcoe_ctlr *fip)
{
struct fcoe_fcf *fcf;
struct fcoe_fcf *best = fip->sel_fcf;
list_for_each_entry(fcf, &fip->fcfs, list) {
LIBFCOE_FIP_DBG(fip, "consider FCF fab %16.16llx "
"VFID %d mac %pM map %x val %d "
"sent %u pri %u\n",
fcf->fabric_name, fcf->vfid, fcf->fcf_mac,
fcf->fc_map, fcoe_ctlr_mtu_valid(fcf),
fcf->flogi_sent, fcf->pri);
if (!fcoe_ctlr_fcf_usable(fcf)) {
LIBFCOE_FIP_DBG(fip, "FCF for fab %16.16llx "
"map %x %svalid %savailable\n",
fcf->fabric_name, fcf->fc_map,
(fcf->flags & FIP_FL_SOL) ? "" : "in",
(fcf->flags & FIP_FL_AVAIL) ?
"" : "un");
continue;
}
if (!best || fcf->pri < best->pri || best->flogi_sent)
best = fcf;
if (fcf->fabric_name != best->fabric_name ||
fcf->vfid != best->vfid ||
fcf->fc_map != best->fc_map) {
LIBFCOE_FIP_DBG(fip, "Conflicting fabric, VFID, "
"or FC-MAP\n");
return NULL;
}
}
fip->sel_fcf = best;
if (best) {
LIBFCOE_FIP_DBG(fip, "using FCF mac %pM\n", best->fcf_mac);
fip->port_ka_time = jiffies +
msecs_to_jiffies(FIP_VN_KA_PERIOD);
fip->ctlr_ka_time = jiffies + best->fka_period;
if (time_before(fip->ctlr_ka_time, fip->timer.expires))
mod_timer(&fip->timer, fip->ctlr_ka_time);
}
return best;
}
/**
* fcoe_ctlr_flogi_send_locked() - send FIP-encapsulated FLOGI to current FCF
* @fip: The FCoE controller
*
* Returns non-zero error if it could not be sent.
*
* Called with ctlr_mutex and ctlr_lock held.
* Caller must verify that fip->sel_fcf is not NULL.
*/
static int fcoe_ctlr_flogi_send_locked(struct fcoe_ctlr *fip)
{
struct sk_buff *skb;
struct sk_buff *skb_orig;
struct fc_frame_header *fh;
int error;
skb_orig = fip->flogi_req;
if (!skb_orig)
return -EINVAL;
/*
* Clone and send the FLOGI request. If clone fails, use original.
*/
skb = skb_clone(skb_orig, GFP_ATOMIC);
if (!skb) {
skb = skb_orig;
fip->flogi_req = NULL;
}
fh = (struct fc_frame_header *)skb->data;
error = fcoe_ctlr_encaps(fip, fip->lp, FIP_DT_FLOGI, skb,
ntoh24(fh->fh_d_id));
if (error) {
kfree_skb(skb);
return error;
}
fip->send(fip, skb);
fip->sel_fcf->flogi_sent = 1;
return 0;
}
/**
* fcoe_ctlr_flogi_retry() - resend FLOGI request to a new FCF if possible
* @fip: The FCoE controller
*
* Returns non-zero error code if there's no FLOGI request to retry or
* no alternate FCF available.
*/
static int fcoe_ctlr_flogi_retry(struct fcoe_ctlr *fip)
{
struct fcoe_fcf *fcf;
int error;
mutex_lock(&fip->ctlr_mutex);
spin_lock_bh(&fip->ctlr_lock);
LIBFCOE_FIP_DBG(fip, "re-sending FLOGI - reselect\n");
fcf = fcoe_ctlr_select(fip);
if (!fcf || fcf->flogi_sent) {
kfree_skb(fip->flogi_req);
fip->flogi_req = NULL;
error = -ENOENT;
} else {
fcoe_ctlr_solicit(fip, NULL);
error = fcoe_ctlr_flogi_send_locked(fip);
}
spin_unlock_bh(&fip->ctlr_lock);
mutex_unlock(&fip->ctlr_mutex);
return error;
}
/**
* fcoe_ctlr_flogi_send() - Handle sending of FIP FLOGI.
* @fip: The FCoE controller that timed out
*
* Done here because fcoe_ctlr_els_send() can't get mutex.
*
* Called with ctlr_mutex held. The caller must not hold ctlr_lock.
*/
static void fcoe_ctlr_flogi_send(struct fcoe_ctlr *fip)
{
struct fcoe_fcf *fcf;
spin_lock_bh(&fip->ctlr_lock);
fcf = fip->sel_fcf;
if (!fcf || !fip->flogi_req_send)
goto unlock;
LIBFCOE_FIP_DBG(fip, "sending FLOGI\n");
/*
* If this FLOGI is being sent due to a timeout retry
* to the same FCF as before, select a different FCF if possible.
*/
if (fcf->flogi_sent) {
LIBFCOE_FIP_DBG(fip, "sending FLOGI - reselect\n");
fcf = fcoe_ctlr_select(fip);
if (!fcf || fcf->flogi_sent) {
LIBFCOE_FIP_DBG(fip, "sending FLOGI - clearing\n");
list_for_each_entry(fcf, &fip->fcfs, list)
fcf->flogi_sent = 0;
fcf = fcoe_ctlr_select(fip);
}
}
if (fcf) {
fcoe_ctlr_flogi_send_locked(fip);
fip->flogi_req_send = 0;
} else /* XXX */
LIBFCOE_FIP_DBG(fip, "No FCF selected - defer send\n");
unlock:
spin_unlock_bh(&fip->ctlr_lock);
}
/**
* fcoe_ctlr_timeout() - FIP timeout handler
* @arg: The FCoE controller that timed out
*/
static void fcoe_ctlr_timeout(unsigned long arg)
{
struct fcoe_ctlr *fip = (struct fcoe_ctlr *)arg;
schedule_work(&fip->timer_work);
}
/**
* fcoe_ctlr_timer_work() - Worker thread function for timer work
* @work: Handle to a FCoE controller
*
* Ages FCFs. Triggers FCF selection if possible.
* Sends keep-alives and resets.
*/
static void fcoe_ctlr_timer_work(struct work_struct *work)
{
struct fcoe_ctlr *fip;
struct fc_lport *vport;
u8 *mac;
u8 reset = 0;
u8 send_ctlr_ka = 0;
u8 send_port_ka = 0;
struct fcoe_fcf *sel;
struct fcoe_fcf *fcf;
unsigned long next_timer;
fip = container_of(work, struct fcoe_ctlr, timer_work);
if (fip->mode == FIP_MODE_VN2VN)
return fcoe_ctlr_vn_timeout(fip);
mutex_lock(&fip->ctlr_mutex);
if (fip->state == FIP_ST_DISABLED) {
mutex_unlock(&fip->ctlr_mutex);
return;
}
fcf = fip->sel_fcf;
next_timer = fcoe_ctlr_age_fcfs(fip);
sel = fip->sel_fcf;
if (!sel && fip->sel_time) {
if (time_after_eq(jiffies, fip->sel_time)) {
sel = fcoe_ctlr_select(fip);
fip->sel_time = 0;
} else if (time_after(next_timer, fip->sel_time))
next_timer = fip->sel_time;
}
if (sel && fip->flogi_req_send)
fcoe_ctlr_flogi_send(fip);
else if (!sel && fcf)
reset = 1;
if (sel && !sel->fd_flags) {
if (time_after_eq(jiffies, fip->ctlr_ka_time)) {
fip->ctlr_ka_time = jiffies + sel->fka_period;
send_ctlr_ka = 1;
}
if (time_after(next_timer, fip->ctlr_ka_time))
next_timer = fip->ctlr_ka_time;
if (time_after_eq(jiffies, fip->port_ka_time)) {
fip->port_ka_time = jiffies +
msecs_to_jiffies(FIP_VN_KA_PERIOD);
send_port_ka = 1;
}
if (time_after(next_timer, fip->port_ka_time))
next_timer = fip->port_ka_time;
}
if (!list_empty(&fip->fcfs))
mod_timer(&fip->timer, next_timer);
mutex_unlock(&fip->ctlr_mutex);
if (reset) {
fc_lport_reset(fip->lp);
/* restart things with a solicitation */
fcoe_ctlr_solicit(fip, NULL);
}
if (send_ctlr_ka)
fcoe_ctlr_send_keep_alive(fip, NULL, 0, fip->ctl_src_addr);
if (send_port_ka) {
mutex_lock(&fip->lp->lp_mutex);
mac = fip->get_src_addr(fip->lp);
fcoe_ctlr_send_keep_alive(fip, fip->lp, 1, mac);
list_for_each_entry(vport, &fip->lp->vports, list) {
mac = fip->get_src_addr(vport);
fcoe_ctlr_send_keep_alive(fip, vport, 1, mac);
}
mutex_unlock(&fip->lp->lp_mutex);
}
}
/**
* fcoe_ctlr_recv_work() - Worker thread function for receiving FIP frames
* @recv_work: Handle to a FCoE controller
*/
static void fcoe_ctlr_recv_work(struct work_struct *recv_work)
{
struct fcoe_ctlr *fip;
struct sk_buff *skb;
fip = container_of(recv_work, struct fcoe_ctlr, recv_work);
while ((skb = skb_dequeue(&fip->fip_recv_list)))
fcoe_ctlr_recv_handler(fip, skb);
}
/**
* fcoe_ctlr_recv_flogi() - Snoop pre-FIP receipt of FLOGI response
* @fip: The FCoE controller
* @fp: The FC frame to snoop
*
* Snoop potential response to FLOGI or even incoming FLOGI.
*
* The caller has checked that we are waiting for login as indicated
* by fip->flogi_oxid != FC_XID_UNKNOWN.
*
* The caller is responsible for freeing the frame.
* Fill in the granted_mac address.
*
* Return non-zero if the frame should not be delivered to libfc.
*/
int fcoe_ctlr_recv_flogi(struct fcoe_ctlr *fip, struct fc_lport *lport,
struct fc_frame *fp)
{
struct fc_frame_header *fh;
u8 op;
u8 *sa;
sa = eth_hdr(&fp->skb)->h_source;
fh = fc_frame_header_get(fp);
if (fh->fh_type != FC_TYPE_ELS)
return 0;
op = fc_frame_payload_op(fp);
if (op == ELS_LS_ACC && fh->fh_r_ctl == FC_RCTL_ELS_REP &&
fip->flogi_oxid == ntohs(fh->fh_ox_id)) {
mutex_lock(&fip->ctlr_mutex);
if (fip->state != FIP_ST_AUTO && fip->state != FIP_ST_NON_FIP) {
mutex_unlock(&fip->ctlr_mutex);
return -EINVAL;
}
fcoe_ctlr_set_state(fip, FIP_ST_NON_FIP);
LIBFCOE_FIP_DBG(fip,
"received FLOGI LS_ACC using non-FIP mode\n");
/*
* FLOGI accepted.
* If the src mac addr is FC_OUI-based, then we mark the
* address_mode flag to use FC_OUI-based Ethernet DA.
* Otherwise we use the FCoE gateway addr
*/
if (ether_addr_equal(sa, (u8[6])FC_FCOE_FLOGI_MAC)) {
fcoe_ctlr_map_dest(fip);
} else {
memcpy(fip->dest_addr, sa, ETH_ALEN);
fip->map_dest = 0;
}
fip->flogi_oxid = FC_XID_UNKNOWN;
mutex_unlock(&fip->ctlr_mutex);
fc_fcoe_set_mac(fr_cb(fp)->granted_mac, fh->fh_d_id);
} else if (op == ELS_FLOGI && fh->fh_r_ctl == FC_RCTL_ELS_REQ && sa) {
/*
* Save source MAC for point-to-point responses.
*/
mutex_lock(&fip->ctlr_mutex);
if (fip->state == FIP_ST_AUTO || fip->state == FIP_ST_NON_FIP) {
memcpy(fip->dest_addr, sa, ETH_ALEN);
fip->map_dest = 0;
if (fip->state == FIP_ST_AUTO)
LIBFCOE_FIP_DBG(fip, "received non-FIP FLOGI. "
"Setting non-FIP mode\n");
fcoe_ctlr_set_state(fip, FIP_ST_NON_FIP);
}
mutex_unlock(&fip->ctlr_mutex);
}
return 0;
}
EXPORT_SYMBOL(fcoe_ctlr_recv_flogi);
/**
* fcoe_wwn_from_mac() - Converts a 48-bit IEEE MAC address to a 64-bit FC WWN
* @mac: The MAC address to convert
* @scheme: The scheme to use when converting
* @port: The port indicator for converting
*
* Returns: u64 fc world wide name
*/
u64 fcoe_wwn_from_mac(unsigned char mac[MAX_ADDR_LEN],
unsigned int scheme, unsigned int port)
{
u64 wwn;
u64 host_mac;
/* The MAC is in NO, so flip only the low 48 bits */
host_mac = ((u64) mac[0] << 40) |
((u64) mac[1] << 32) |
((u64) mac[2] << 24) |
((u64) mac[3] << 16) |
((u64) mac[4] << 8) |
(u64) mac[5];
WARN_ON(host_mac >= (1ULL << 48));
wwn = host_mac | ((u64) scheme << 60);
switch (scheme) {
case 1:
WARN_ON(port != 0);
break;
case 2:
WARN_ON(port >= 0xfff);
wwn |= (u64) port << 48;
break;
default:
WARN_ON(1);
break;
}
return wwn;
}
EXPORT_SYMBOL_GPL(fcoe_wwn_from_mac);
/**
* fcoe_ctlr_rport() - return the fcoe_rport for a given fc_rport_priv
* @rdata: libfc remote port
*/
static inline struct fcoe_rport *fcoe_ctlr_rport(struct fc_rport_priv *rdata)
{
return (struct fcoe_rport *)(rdata + 1);
}
/**
* fcoe_ctlr_vn_send() - Send a FIP VN2VN Probe Request or Reply.
* @fip: The FCoE controller
* @sub: sub-opcode for probe request, reply, or advertisement.
* @dest: The destination Ethernet MAC address
* @min_len: minimum size of the Ethernet payload to be sent
*/
static void fcoe_ctlr_vn_send(struct fcoe_ctlr *fip,
enum fip_vn2vn_subcode sub,
const u8 *dest, size_t min_len)
{
struct sk_buff *skb;
struct fip_vn2vn_probe_frame {
struct ethhdr eth;
struct fip_header fip;
struct fip_mac_desc mac;
struct fip_wwn_desc wwnn;
struct fip_vn_desc vn;
} __packed * frame;
struct fip_fc4_feat *ff;
struct fip_size_desc *size;
u32 fcp_feat;
size_t len;
size_t dlen;
len = sizeof(*frame);
dlen = 0;
if (sub == FIP_SC_VN_CLAIM_NOTIFY || sub == FIP_SC_VN_CLAIM_REP) {
dlen = sizeof(struct fip_fc4_feat) +
sizeof(struct fip_size_desc);
len += dlen;
}
dlen += sizeof(frame->mac) + sizeof(frame->wwnn) + sizeof(frame->vn);
len = max(len, min_len + sizeof(struct ethhdr));
skb = dev_alloc_skb(len);
if (!skb)
return;
frame = (struct fip_vn2vn_probe_frame *)skb->data;
memset(frame, 0, len);
memcpy(frame->eth.h_dest, dest, ETH_ALEN);
if (sub == FIP_SC_VN_BEACON) {
hton24(frame->eth.h_source, FIP_VN_FC_MAP);
hton24(frame->eth.h_source + 3, fip->port_id);
} else {
memcpy(frame->eth.h_source, fip->ctl_src_addr, ETH_ALEN);
}
frame->eth.h_proto = htons(ETH_P_FIP);
frame->fip.fip_ver = FIP_VER_ENCAPS(FIP_VER);
frame->fip.fip_op = htons(FIP_OP_VN2VN);
frame->fip.fip_subcode = sub;
frame->fip.fip_dl_len = htons(dlen / FIP_BPW);
frame->mac.fd_desc.fip_dtype = FIP_DT_MAC;
frame->mac.fd_desc.fip_dlen = sizeof(frame->mac) / FIP_BPW;
memcpy(frame->mac.fd_mac, fip->ctl_src_addr, ETH_ALEN);
frame->wwnn.fd_desc.fip_dtype = FIP_DT_NAME;
frame->wwnn.fd_desc.fip_dlen = sizeof(frame->wwnn) / FIP_BPW;
put_unaligned_be64(fip->lp->wwnn, &frame->wwnn.fd_wwn);
frame->vn.fd_desc.fip_dtype = FIP_DT_VN_ID;
frame->vn.fd_desc.fip_dlen = sizeof(frame->vn) / FIP_BPW;
hton24(frame->vn.fd_mac, FIP_VN_FC_MAP);
hton24(frame->vn.fd_mac + 3, fip->port_id);
hton24(frame->vn.fd_fc_id, fip->port_id);
put_unaligned_be64(fip->lp->wwpn, &frame->vn.fd_wwpn);
/*
* For claims, add FC-4 features.
* TBD: Add interface to get fc-4 types and features from libfc.
*/
if (sub == FIP_SC_VN_CLAIM_NOTIFY || sub == FIP_SC_VN_CLAIM_REP) {
ff = (struct fip_fc4_feat *)(frame + 1);
ff->fd_desc.fip_dtype = FIP_DT_FC4F;
ff->fd_desc.fip_dlen = sizeof(*ff) / FIP_BPW;
ff->fd_fts = fip->lp->fcts;
fcp_feat = 0;
if (fip->lp->service_params & FCP_SPPF_INIT_FCN)
fcp_feat |= FCP_FEAT_INIT;
if (fip->lp->service_params & FCP_SPPF_TARG_FCN)
fcp_feat |= FCP_FEAT_TARG;
fcp_feat <<= (FC_TYPE_FCP * 4) % 32;
ff->fd_ff.fd_feat[FC_TYPE_FCP * 4 / 32] = htonl(fcp_feat);
size = (struct fip_size_desc *)(ff + 1);
size->fd_desc.fip_dtype = FIP_DT_FCOE_SIZE;
size->fd_desc.fip_dlen = sizeof(*size) / FIP_BPW;
size->fd_size = htons(fcoe_ctlr_fcoe_size(fip));
}
skb_put(skb, len);
skb->protocol = htons(ETH_P_FIP);
skb->priority = fip->priority;
skb_reset_mac_header(skb);
skb_reset_network_header(skb);
fip->send(fip, skb);
}
/**
* fcoe_ctlr_vn_rport_callback - Event handler for rport events.
* @lport: The lport which is receiving the event
* @rdata: remote port private data
* @event: The event that occurred
*
* Locking Note: The rport lock must not be held when calling this function.
*/
static void fcoe_ctlr_vn_rport_callback(struct fc_lport *lport,
struct fc_rport_priv *rdata,
enum fc_rport_event event)
{
struct fcoe_ctlr *fip = lport->disc.priv;
struct fcoe_rport *frport = fcoe_ctlr_rport(rdata);
LIBFCOE_FIP_DBG(fip, "vn_rport_callback %x event %d\n",
rdata->ids.port_id, event);
mutex_lock(&fip->ctlr_mutex);
switch (event) {
case RPORT_EV_READY:
frport->login_count = 0;
break;
case RPORT_EV_LOGO:
case RPORT_EV_FAILED:
case RPORT_EV_STOP:
frport->login_count++;
if (frport->login_count > FCOE_CTLR_VN2VN_LOGIN_LIMIT) {
LIBFCOE_FIP_DBG(fip,
"rport FLOGI limited port_id %6.6x\n",
rdata->ids.port_id);
fc_rport_logoff(rdata);
}
break;
default:
break;
}
mutex_unlock(&fip->ctlr_mutex);
}
static struct fc_rport_operations fcoe_ctlr_vn_rport_ops = {
.event_callback = fcoe_ctlr_vn_rport_callback,
};
/**
* fcoe_ctlr_disc_stop_locked() - stop discovery in VN2VN mode
* @fip: The FCoE controller
*
* Called with ctlr_mutex held.
*/
static void fcoe_ctlr_disc_stop_locked(struct fc_lport *lport)
{
struct fc_rport_priv *rdata;
rcu_read_lock();
list_for_each_entry_rcu(rdata, &lport->disc.rports, peers) {
if (kref_get_unless_zero(&rdata->kref)) {
fc_rport_logoff(rdata);
kref_put(&rdata->kref, fc_rport_destroy);
}
}
rcu_read_unlock();
mutex_lock(&lport->disc.disc_mutex);
lport->disc.disc_callback = NULL;
mutex_unlock(&lport->disc.disc_mutex);
}
/**
* fcoe_ctlr_disc_stop() - stop discovery in VN2VN mode
* @fip: The FCoE controller
*
* Called through the local port template for discovery.
* Called without the ctlr_mutex held.
*/
static void fcoe_ctlr_disc_stop(struct fc_lport *lport)
{
struct fcoe_ctlr *fip = lport->disc.priv;
mutex_lock(&fip->ctlr_mutex);
fcoe_ctlr_disc_stop_locked(lport);
mutex_unlock(&fip->ctlr_mutex);
}
/**
* fcoe_ctlr_disc_stop_final() - stop discovery for shutdown in VN2VN mode
* @fip: The FCoE controller
*
* Called through the local port template for discovery.
* Called without the ctlr_mutex held.
*/
static void fcoe_ctlr_disc_stop_final(struct fc_lport *lport)
{
fcoe_ctlr_disc_stop(lport);
fc_rport_flush_queue();
synchronize_rcu();
}
/**
* fcoe_ctlr_vn_restart() - VN2VN probe restart with new port_id
* @fip: The FCoE controller
*
* Called with fcoe_ctlr lock held.
*/
static void fcoe_ctlr_vn_restart(struct fcoe_ctlr *fip)
{
unsigned long wait;
u32 port_id;
fcoe_ctlr_disc_stop_locked(fip->lp);
/*
* Get proposed port ID.
* If this is the first try after link up, use any previous port_id.
* If there was none, use the low bits of the port_name.
* On subsequent tries, get the next random one.
* Don't use reserved IDs, use another non-zero value, just as random.
*/
port_id = fip->port_id;
if (fip->probe_tries)
port_id = prandom_u32_state(&fip->rnd_state) & 0xffff;
else if (!port_id)
port_id = fip->lp->wwpn & 0xffff;
if (!port_id || port_id == 0xffff)
port_id = 1;
fip->port_id = port_id;
if (fip->probe_tries < FIP_VN_RLIM_COUNT) {
fip->probe_tries++;
wait = prandom_u32() % FIP_VN_PROBE_WAIT;
} else
wait = FIP_VN_RLIM_INT;
mod_timer(&fip->timer, jiffies + msecs_to_jiffies(wait));
fcoe_ctlr_set_state(fip, FIP_ST_VNMP_START);
}
/**
* fcoe_ctlr_vn_start() - Start in VN2VN mode
* @fip: The FCoE controller
*
* Called with fcoe_ctlr lock held.
*/
static void fcoe_ctlr_vn_start(struct fcoe_ctlr *fip)
{
fip->probe_tries = 0;
prandom_seed_state(&fip->rnd_state, fip->lp->wwpn);
fcoe_ctlr_vn_restart(fip);
}
/**
* fcoe_ctlr_vn_parse - parse probe request or response
* @fip: The FCoE controller
* @skb: incoming packet
* @rdata: buffer for resulting parsed VN entry plus fcoe_rport
*
* Returns non-zero error number on error.
* Does not consume the packet.
*/
static int fcoe_ctlr_vn_parse(struct fcoe_ctlr *fip,
struct sk_buff *skb,
struct fc_rport_priv *rdata)
{
struct fip_header *fiph;
struct fip_desc *desc = NULL;
struct fip_mac_desc *macd = NULL;
struct fip_wwn_desc *wwn = NULL;
struct fip_vn_desc *vn = NULL;
struct fip_size_desc *size = NULL;
struct fcoe_rport *frport;
size_t rlen;
size_t dlen;
u32 desc_mask = 0;
u32 dtype;
u8 sub;
memset(rdata, 0, sizeof(*rdata) + sizeof(*frport));
frport = fcoe_ctlr_rport(rdata);
fiph = (struct fip_header *)skb->data;
frport->flags = ntohs(fiph->fip_flags);
sub = fiph->fip_subcode;
switch (sub) {
case FIP_SC_VN_PROBE_REQ:
case FIP_SC_VN_PROBE_REP:
case FIP_SC_VN_BEACON:
desc_mask = BIT(FIP_DT_MAC) | BIT(FIP_DT_NAME) |
BIT(FIP_DT_VN_ID);
break;
case FIP_SC_VN_CLAIM_NOTIFY:
case FIP_SC_VN_CLAIM_REP:
desc_mask = BIT(FIP_DT_MAC) | BIT(FIP_DT_NAME) |
BIT(FIP_DT_VN_ID) | BIT(FIP_DT_FC4F) |
BIT(FIP_DT_FCOE_SIZE);
break;
default:
LIBFCOE_FIP_DBG(fip, "vn_parse unknown subcode %u\n", sub);
return -EINVAL;
}
rlen = ntohs(fiph->fip_dl_len) * 4;
if (rlen + sizeof(*fiph) > skb->len)
return -EINVAL;
desc = (struct fip_desc *)(fiph + 1);
while (rlen > 0) {
dlen = desc->fip_dlen * FIP_BPW;
if (dlen < sizeof(*desc) || dlen > rlen)
return -EINVAL;
dtype = desc->fip_dtype;
if (dtype < 32) {
if (!(desc_mask & BIT(dtype))) {
LIBFCOE_FIP_DBG(fip,
"unexpected or duplicated desc "
"desc type %u in "
"FIP VN2VN subtype %u\n",
dtype, sub);
return -EINVAL;
}
desc_mask &= ~BIT(dtype);
}
switch (dtype) {
case FIP_DT_MAC:
if (dlen != sizeof(struct fip_mac_desc))
goto len_err;
macd = (struct fip_mac_desc *)desc;
if (!is_valid_ether_addr(macd->fd_mac)) {
LIBFCOE_FIP_DBG(fip,
"Invalid MAC addr %pM in FIP VN2VN\n",
macd->fd_mac);
return -EINVAL;
}
memcpy(frport->enode_mac, macd->fd_mac, ETH_ALEN);
break;
case FIP_DT_NAME:
if (dlen != sizeof(struct fip_wwn_desc))
goto len_err;
wwn = (struct fip_wwn_desc *)desc;
rdata->ids.node_name = get_unaligned_be64(&wwn->fd_wwn);
break;
case FIP_DT_VN_ID:
if (dlen != sizeof(struct fip_vn_desc))
goto len_err;
vn = (struct fip_vn_desc *)desc;
memcpy(frport->vn_mac, vn->fd_mac, ETH_ALEN);
rdata->ids.port_id = ntoh24(vn->fd_fc_id);
rdata->ids.port_name = get_unaligned_be64(&vn->fd_wwpn);
break;
case FIP_DT_FC4F:
if (dlen != sizeof(struct fip_fc4_feat))
goto len_err;
break;
case FIP_DT_FCOE_SIZE:
if (dlen != sizeof(struct fip_size_desc))
goto len_err;
size = (struct fip_size_desc *)desc;
frport->fcoe_len = ntohs(size->fd_size);
break;
default:
LIBFCOE_FIP_DBG(fip, "unexpected descriptor type %x "
"in FIP probe\n", dtype);
/* standard says ignore unknown descriptors >= 128 */
if (dtype < FIP_DT_NON_CRITICAL)
return -EINVAL;
break;
}
desc = (struct fip_desc *)((char *)desc + dlen);
rlen -= dlen;
}
return 0;
len_err:
LIBFCOE_FIP_DBG(fip, "FIP length error in descriptor type %x len %zu\n",
dtype, dlen);
return -EINVAL;
}
/**
* fcoe_ctlr_vn_send_claim() - send multicast FIP VN2VN Claim Notification.
* @fip: The FCoE controller
*
* Called with ctlr_mutex held.
*/
static void fcoe_ctlr_vn_send_claim(struct fcoe_ctlr *fip)
{
fcoe_ctlr_vn_send(fip, FIP_SC_VN_CLAIM_NOTIFY, fcoe_all_vn2vn, 0);
fip->sol_time = jiffies;
}
/**
* fcoe_ctlr_vn_probe_req() - handle incoming VN2VN probe request.
* @fip: The FCoE controller
* @rdata: parsed remote port with frport from the probe request
*
* Called with ctlr_mutex held.
*/
static void fcoe_ctlr_vn_probe_req(struct fcoe_ctlr *fip,
struct fc_rport_priv *rdata)
{
struct fcoe_rport *frport = fcoe_ctlr_rport(rdata);
if (rdata->ids.port_id != fip->port_id)
return;
switch (fip->state) {
case FIP_ST_VNMP_CLAIM:
case FIP_ST_VNMP_UP:
LIBFCOE_FIP_DBG(fip, "vn_probe_req: send reply, state %x\n",
fip->state);
fcoe_ctlr_vn_send(fip, FIP_SC_VN_PROBE_REP,
frport->enode_mac, 0);
break;
case FIP_ST_VNMP_PROBE1:
case FIP_ST_VNMP_PROBE2:
/*
* Decide whether to reply to the Probe.
* Our selected address is never a "recorded" one, so
* only reply if our WWPN is greater and the
* Probe's REC bit is not set.
* If we don't reply, we will change our address.
*/
if (fip->lp->wwpn > rdata->ids.port_name &&
!(frport->flags & FIP_FL_REC_OR_P2P)) {
LIBFCOE_FIP_DBG(fip, "vn_probe_req: "
"port_id collision\n");
fcoe_ctlr_vn_send(fip, FIP_SC_VN_PROBE_REP,
frport->enode_mac, 0);
break;
}
/* fall through */
case FIP_ST_VNMP_START:
LIBFCOE_FIP_DBG(fip, "vn_probe_req: "
"restart VN2VN negotiation\n");
fcoe_ctlr_vn_restart(fip);
break;
default:
LIBFCOE_FIP_DBG(fip, "vn_probe_req: ignore state %x\n",
fip->state);
break;
}
}
/**
* fcoe_ctlr_vn_probe_reply() - handle incoming VN2VN probe reply.
* @fip: The FCoE controller
* @rdata: parsed remote port with frport from the probe request
*
* Called with ctlr_mutex held.
*/
static void fcoe_ctlr_vn_probe_reply(struct fcoe_ctlr *fip,
struct fc_rport_priv *rdata)
{
if (rdata->ids.port_id != fip->port_id)
return;
switch (fip->state) {
case FIP_ST_VNMP_START:
case FIP_ST_VNMP_PROBE1:
case FIP_ST_VNMP_PROBE2:
case FIP_ST_VNMP_CLAIM:
LIBFCOE_FIP_DBG(fip, "vn_probe_reply: restart state %x\n",
fip->state);
fcoe_ctlr_vn_restart(fip);
break;
case FIP_ST_VNMP_UP:
LIBFCOE_FIP_DBG(fip, "vn_probe_reply: send claim notify\n");
fcoe_ctlr_vn_send_claim(fip);
break;
default:
break;
}
}
/**
* fcoe_ctlr_vn_add() - Add a VN2VN entry to the list, based on a claim reply.
* @fip: The FCoE controller
* @new: newly-parsed remote port with frport as a template for new rdata
*
* Called with ctlr_mutex held.
*/
static void fcoe_ctlr_vn_add(struct fcoe_ctlr *fip, struct fc_rport_priv *new)
{
struct fc_lport *lport = fip->lp;
struct fc_rport_priv *rdata;
struct fc_rport_identifiers *ids;
struct fcoe_rport *frport;
u32 port_id;
port_id = new->ids.port_id;
if (port_id == fip->port_id)
return;
mutex_lock(&lport->disc.disc_mutex);
rdata = fc_rport_create(lport, port_id);
if (!rdata) {
mutex_unlock(&lport->disc.disc_mutex);
return;
}
mutex_lock(&rdata->rp_mutex);
mutex_unlock(&lport->disc.disc_mutex);
rdata->ops = &fcoe_ctlr_vn_rport_ops;
rdata->disc_id = lport->disc.disc_id;
ids = &rdata->ids;
if ((ids->port_name != -1 && ids->port_name != new->ids.port_name) ||
(ids->node_name != -1 && ids->node_name != new->ids.node_name)) {
mutex_unlock(&rdata->rp_mutex);
LIBFCOE_FIP_DBG(fip, "vn_add rport logoff %6.6x\n", port_id);
fc_rport_logoff(rdata);
mutex_lock(&rdata->rp_mutex);
}
ids->port_name = new->ids.port_name;
ids->node_name = new->ids.node_name;
mutex_unlock(&rdata->rp_mutex);
frport = fcoe_ctlr_rport(rdata);
LIBFCOE_FIP_DBG(fip, "vn_add rport %6.6x %s state %d\n",
port_id, frport->fcoe_len ? "old" : "new",
rdata->rp_state);
*frport = *fcoe_ctlr_rport(new);
frport->time = 0;
}
/**
* fcoe_ctlr_vn_lookup() - Find VN remote port's MAC address
* @fip: The FCoE controller
* @port_id: The port_id of the remote VN_node
* @mac: buffer which will hold the VN_NODE destination MAC address, if found.
*
* Returns non-zero error if no remote port found.
*/
static int fcoe_ctlr_vn_lookup(struct fcoe_ctlr *fip, u32 port_id, u8 *mac)
{
struct fc_lport *lport = fip->lp;
struct fc_rport_priv *rdata;
struct fcoe_rport *frport;
int ret = -1;
rdata = fc_rport_lookup(lport, port_id);
if (rdata) {
frport = fcoe_ctlr_rport(rdata);
memcpy(mac, frport->enode_mac, ETH_ALEN);
ret = 0;
kref_put(&rdata->kref, fc_rport_destroy);
}
return ret;
}
/**
* fcoe_ctlr_vn_claim_notify() - handle received FIP VN2VN Claim Notification
* @fip: The FCoE controller
* @new: newly-parsed remote port with frport as a template for new rdata
*
* Called with ctlr_mutex held.
*/
static void fcoe_ctlr_vn_claim_notify(struct fcoe_ctlr *fip,
struct fc_rport_priv *new)
{
struct fcoe_rport *frport = fcoe_ctlr_rport(new);
if (frport->flags & FIP_FL_REC_OR_P2P) {
LIBFCOE_FIP_DBG(fip, "send probe req for P2P/REC\n");
fcoe_ctlr_vn_send(fip, FIP_SC_VN_PROBE_REQ, fcoe_all_vn2vn, 0);
return;
}
switch (fip->state) {
case FIP_ST_VNMP_START:
case FIP_ST_VNMP_PROBE1:
case FIP_ST_VNMP_PROBE2:
if (new->ids.port_id == fip->port_id) {
LIBFCOE_FIP_DBG(fip, "vn_claim_notify: "
"restart, state %d\n",
fip->state);
fcoe_ctlr_vn_restart(fip);
}
break;
case FIP_ST_VNMP_CLAIM:
case FIP_ST_VNMP_UP:
if (new->ids.port_id == fip->port_id) {
if (new->ids.port_name > fip->lp->wwpn) {
LIBFCOE_FIP_DBG(fip, "vn_claim_notify: "
"restart, port_id collision\n");
fcoe_ctlr_vn_restart(fip);
break;
}
LIBFCOE_FIP_DBG(fip, "vn_claim_notify: "
"send claim notify\n");
fcoe_ctlr_vn_send_claim(fip);
break;
}
LIBFCOE_FIP_DBG(fip, "vn_claim_notify: send reply to %x\n",
new->ids.port_id);
fcoe_ctlr_vn_send(fip, FIP_SC_VN_CLAIM_REP, frport->enode_mac,
min((u32)frport->fcoe_len,
fcoe_ctlr_fcoe_size(fip)));
fcoe_ctlr_vn_add(fip, new);
break;
default:
LIBFCOE_FIP_DBG(fip, "vn_claim_notify: "
"ignoring claim from %x\n", new->ids.port_id);
break;
}
}
/**
* fcoe_ctlr_vn_claim_resp() - handle received Claim Response
* @fip: The FCoE controller that received the frame
* @new: newly-parsed remote port with frport from the Claim Response
*
* Called with ctlr_mutex held.
*/
static void fcoe_ctlr_vn_claim_resp(struct fcoe_ctlr *fip,
struct fc_rport_priv *new)
{
LIBFCOE_FIP_DBG(fip, "claim resp from from rport %x - state %s\n",
new->ids.port_id, fcoe_ctlr_state(fip->state));
if (fip->state == FIP_ST_VNMP_UP || fip->state == FIP_ST_VNMP_CLAIM)
fcoe_ctlr_vn_add(fip, new);
}
/**
* fcoe_ctlr_vn_beacon() - handle received beacon.
* @fip: The FCoE controller that received the frame
* @new: newly-parsed remote port with frport from the Beacon
*
* Called with ctlr_mutex held.
*/
static void fcoe_ctlr_vn_beacon(struct fcoe_ctlr *fip,
struct fc_rport_priv *new)
{
struct fc_lport *lport = fip->lp;
struct fc_rport_priv *rdata;
struct fcoe_rport *frport;
frport = fcoe_ctlr_rport(new);
if (frport->flags & FIP_FL_REC_OR_P2P) {
LIBFCOE_FIP_DBG(fip, "p2p beacon while in vn2vn mode\n");
fcoe_ctlr_vn_send(fip, FIP_SC_VN_PROBE_REQ, fcoe_all_vn2vn, 0);
return;
}
rdata = fc_rport_lookup(lport, new->ids.port_id);
if (rdata) {
if (rdata->ids.node_name == new->ids.node_name &&
rdata->ids.port_name == new->ids.port_name) {
frport = fcoe_ctlr_rport(rdata);
LIBFCOE_FIP_DBG(fip, "beacon from rport %x\n",
rdata->ids.port_id);
if (!frport->time && fip->state == FIP_ST_VNMP_UP) {
LIBFCOE_FIP_DBG(fip, "beacon expired "
"for rport %x\n",
rdata->ids.port_id);
fc_rport_login(rdata);
}
frport->time = jiffies;
}
kref_put(&rdata->kref, fc_rport_destroy);
return;
}
if (fip->state != FIP_ST_VNMP_UP)
return;
/*
* Beacon from a new neighbor.
* Send a claim notify if one hasn't been sent recently.
* Don't add the neighbor yet.
*/
LIBFCOE_FIP_DBG(fip, "beacon from new rport %x. sending claim notify\n",
new->ids.port_id);
if (time_after(jiffies,
fip->sol_time + msecs_to_jiffies(FIP_VN_ANN_WAIT)))
fcoe_ctlr_vn_send_claim(fip);
}
/**
* fcoe_ctlr_vn_age() - Check for VN_ports without recent beacons
* @fip: The FCoE controller
*
* Called with ctlr_mutex held.
* Called only in state FIP_ST_VNMP_UP.
* Returns the soonest time for next age-out or a time far in the future.
*/
static unsigned long fcoe_ctlr_vn_age(struct fcoe_ctlr *fip)
{
struct fc_lport *lport = fip->lp;
struct fc_rport_priv *rdata;
struct fcoe_rport *frport;
unsigned long next_time;
unsigned long deadline;
next_time = jiffies + msecs_to_jiffies(FIP_VN_BEACON_INT * 10);
rcu_read_lock();
list_for_each_entry_rcu(rdata, &lport->disc.rports, peers) {
if (!kref_get_unless_zero(&rdata->kref))
continue;
frport = fcoe_ctlr_rport(rdata);
if (!frport->time) {
kref_put(&rdata->kref, fc_rport_destroy);
continue;
}
deadline = frport->time +
msecs_to_jiffies(FIP_VN_BEACON_INT * 25 / 10);
if (time_after_eq(jiffies, deadline)) {
frport->time = 0;
LIBFCOE_FIP_DBG(fip,
"port %16.16llx fc_id %6.6x beacon expired\n",
rdata->ids.port_name, rdata->ids.port_id);
fc_rport_logoff(rdata);
} else if (time_before(deadline, next_time))
next_time = deadline;
kref_put(&rdata->kref, fc_rport_destroy);
}
rcu_read_unlock();
return next_time;
}
/**
* fcoe_ctlr_vn_recv() - Receive a FIP frame
* @fip: The FCoE controller that received the frame
* @skb: The received FIP frame
*
* Returns non-zero if the frame is dropped.
* Always consumes the frame.
*/
static int fcoe_ctlr_vn_recv(struct fcoe_ctlr *fip, struct sk_buff *skb)
{
struct fip_header *fiph;
enum fip_vn2vn_subcode sub;
struct {
struct fc_rport_priv rdata;
struct fcoe_rport frport;
} buf;
int rc, vlan_id = 0;
fiph = (struct fip_header *)skb->data;
sub = fiph->fip_subcode;
if (fip->lp->vlan)
vlan_id = skb_vlan_tag_get_id(skb);
if (vlan_id && vlan_id != fip->lp->vlan) {
LIBFCOE_FIP_DBG(fip, "vn_recv drop frame sub %x vlan %d\n",
sub, vlan_id);
rc = -EAGAIN;
goto drop;
}
rc = fcoe_ctlr_vn_parse(fip, skb, &buf.rdata);
if (rc) {
LIBFCOE_FIP_DBG(fip, "vn_recv vn_parse error %d\n", rc);
goto drop;
}
mutex_lock(&fip->ctlr_mutex);
switch (sub) {
case FIP_SC_VN_PROBE_REQ:
fcoe_ctlr_vn_probe_req(fip, &buf.rdata);
break;
case FIP_SC_VN_PROBE_REP:
fcoe_ctlr_vn_probe_reply(fip, &buf.rdata);
break;
case FIP_SC_VN_CLAIM_NOTIFY:
fcoe_ctlr_vn_claim_notify(fip, &buf.rdata);
break;
case FIP_SC_VN_CLAIM_REP:
fcoe_ctlr_vn_claim_resp(fip, &buf.rdata);
break;
case FIP_SC_VN_BEACON:
fcoe_ctlr_vn_beacon(fip, &buf.rdata);
break;
default:
LIBFCOE_FIP_DBG(fip, "vn_recv unknown subcode %d\n", sub);
rc = -1;
break;
}
mutex_unlock(&fip->ctlr_mutex);
drop:
kfree_skb(skb);
return rc;
}
/**
* fcoe_ctlr_vlan_parse - parse vlan discovery request or response
* @fip: The FCoE controller
* @skb: incoming packet
* @rdata: buffer for resulting parsed VLAN entry plus fcoe_rport
*
* Returns non-zero error number on error.
* Does not consume the packet.
*/
static int fcoe_ctlr_vlan_parse(struct fcoe_ctlr *fip,
struct sk_buff *skb,
struct fc_rport_priv *rdata)
{
struct fip_header *fiph;
struct fip_desc *desc = NULL;
struct fip_mac_desc *macd = NULL;
struct fip_wwn_desc *wwn = NULL;
struct fcoe_rport *frport;
size_t rlen;
size_t dlen;
u32 desc_mask = 0;
u32 dtype;
u8 sub;
memset(rdata, 0, sizeof(*rdata) + sizeof(*frport));
frport = fcoe_ctlr_rport(rdata);
fiph = (struct fip_header *)skb->data;
frport->flags = ntohs(fiph->fip_flags);
sub = fiph->fip_subcode;
switch (sub) {
case FIP_SC_VL_REQ:
desc_mask = BIT(FIP_DT_MAC) | BIT(FIP_DT_NAME);
break;
default:
LIBFCOE_FIP_DBG(fip, "vn_parse unknown subcode %u\n", sub);
return -EINVAL;
}
rlen = ntohs(fiph->fip_dl_len) * 4;
if (rlen + sizeof(*fiph) > skb->len)
return -EINVAL;
desc = (struct fip_desc *)(fiph + 1);
while (rlen > 0) {
dlen = desc->fip_dlen * FIP_BPW;
if (dlen < sizeof(*desc) || dlen > rlen)
return -EINVAL;
dtype = desc->fip_dtype;
if (dtype < 32) {
if (!(desc_mask & BIT(dtype))) {
LIBFCOE_FIP_DBG(fip,
"unexpected or duplicated desc "
"desc type %u in "
"FIP VN2VN subtype %u\n",
dtype, sub);
return -EINVAL;
}
desc_mask &= ~BIT(dtype);
}
switch (dtype) {
case FIP_DT_MAC:
if (dlen != sizeof(struct fip_mac_desc))
goto len_err;
macd = (struct fip_mac_desc *)desc;
if (!is_valid_ether_addr(macd->fd_mac)) {
LIBFCOE_FIP_DBG(fip,
"Invalid MAC addr %pM in FIP VN2VN\n",
macd->fd_mac);
return -EINVAL;
}
memcpy(frport->enode_mac, macd->fd_mac, ETH_ALEN);
break;
case FIP_DT_NAME:
if (dlen != sizeof(struct fip_wwn_desc))
goto len_err;
wwn = (struct fip_wwn_desc *)desc;
rdata->ids.node_name = get_unaligned_be64(&wwn->fd_wwn);
break;
default:
LIBFCOE_FIP_DBG(fip, "unexpected descriptor type %x "
"in FIP probe\n", dtype);
/* standard says ignore unknown descriptors >= 128 */
if (dtype < FIP_DT_NON_CRITICAL)
return -EINVAL;
break;
}
desc = (struct fip_desc *)((char *)desc + dlen);
rlen -= dlen;
}
return 0;
len_err:
LIBFCOE_FIP_DBG(fip, "FIP length error in descriptor type %x len %zu\n",
dtype, dlen);
return -EINVAL;
}
/**
* fcoe_ctlr_vlan_send() - Send a FIP VLAN Notification
* @fip: The FCoE controller
* @sub: sub-opcode for vlan notification or vn2vn vlan notification
* @dest: The destination Ethernet MAC address
* @min_len: minimum size of the Ethernet payload to be sent
*/
static void fcoe_ctlr_vlan_send(struct fcoe_ctlr *fip,
enum fip_vlan_subcode sub,
const u8 *dest)
{
struct sk_buff *skb;
struct fip_vlan_notify_frame {
struct ethhdr eth;
struct fip_header fip;
struct fip_mac_desc mac;
struct fip_vlan_desc vlan;
} __packed * frame;
size_t len;
size_t dlen;
len = sizeof(*frame);
dlen = sizeof(frame->mac) + sizeof(frame->vlan);
len = max(len, sizeof(struct ethhdr));
skb = dev_alloc_skb(len);
if (!skb)
return;
LIBFCOE_FIP_DBG(fip, "fip %s vlan notification, vlan %d\n",
fip->mode == FIP_MODE_VN2VN ? "vn2vn" : "fcf",
fip->lp->vlan);
frame = (struct fip_vlan_notify_frame *)skb->data;
memset(frame, 0, len);
memcpy(frame->eth.h_dest, dest, ETH_ALEN);
memcpy(frame->eth.h_source, fip->ctl_src_addr, ETH_ALEN);
frame->eth.h_proto = htons(ETH_P_FIP);
frame->fip.fip_ver = FIP_VER_ENCAPS(FIP_VER);
frame->fip.fip_op = htons(FIP_OP_VLAN);
frame->fip.fip_subcode = sub;
frame->fip.fip_dl_len = htons(dlen / FIP_BPW);
frame->mac.fd_desc.fip_dtype = FIP_DT_MAC;
frame->mac.fd_desc.fip_dlen = sizeof(frame->mac) / FIP_BPW;
memcpy(frame->mac.fd_mac, fip->ctl_src_addr, ETH_ALEN);
frame->vlan.fd_desc.fip_dtype = FIP_DT_VLAN;
frame->vlan.fd_desc.fip_dlen = sizeof(frame->vlan) / FIP_BPW;
put_unaligned_be16(fip->lp->vlan, &frame->vlan.fd_vlan);
skb_put(skb, len);
skb->protocol = htons(ETH_P_FIP);
skb->priority = fip->priority;
skb_reset_mac_header(skb);
skb_reset_network_header(skb);
fip->send(fip, skb);
}
/**
* fcoe_ctlr_vlan_disk_reply() - send FIP VLAN Discovery Notification.
* @fip: The FCoE controller
*
* Called with ctlr_mutex held.
*/
static void fcoe_ctlr_vlan_disc_reply(struct fcoe_ctlr *fip,
struct fc_rport_priv *rdata)
{
struct fcoe_rport *frport = fcoe_ctlr_rport(rdata);
enum fip_vlan_subcode sub = FIP_SC_VL_NOTE;
if (fip->mode == FIP_MODE_VN2VN)
sub = FIP_SC_VL_VN2VN_NOTE;
fcoe_ctlr_vlan_send(fip, sub, frport->enode_mac);
}
/**
* fcoe_ctlr_vlan_recv - vlan request receive handler for VN2VN mode.
* @lport: The local port
* @fp: The received frame
*
*/
static int fcoe_ctlr_vlan_recv(struct fcoe_ctlr *fip, struct sk_buff *skb)
{
struct fip_header *fiph;
enum fip_vlan_subcode sub;
struct {
struct fc_rport_priv rdata;
struct fcoe_rport frport;
} buf;
int rc;
fiph = (struct fip_header *)skb->data;
sub = fiph->fip_subcode;
rc = fcoe_ctlr_vlan_parse(fip, skb, &buf.rdata);
if (rc) {
LIBFCOE_FIP_DBG(fip, "vlan_recv vlan_parse error %d\n", rc);
goto drop;
}
mutex_lock(&fip->ctlr_mutex);
if (sub == FIP_SC_VL_REQ)
fcoe_ctlr_vlan_disc_reply(fip, &buf.rdata);
mutex_unlock(&fip->ctlr_mutex);
drop:
kfree_skb(skb);
return rc;
}
/**
* fcoe_ctlr_disc_recv - discovery receive handler for VN2VN mode.
* @lport: The local port
* @fp: The received frame
*
* This should never be called since we don't see RSCNs or other
* fabric-generated ELSes.
*/
static void fcoe_ctlr_disc_recv(struct fc_lport *lport, struct fc_frame *fp)
{
struct fc_seq_els_data rjt_data;
rjt_data.reason = ELS_RJT_UNSUP;
rjt_data.explan = ELS_EXPL_NONE;
fc_seq_els_rsp_send(fp, ELS_LS_RJT, &rjt_data);
fc_frame_free(fp);
}
/**
* fcoe_ctlr_disc_recv - start discovery for VN2VN mode.
* @fip: The FCoE controller
*
* This sets a flag indicating that remote ports should be created
* and started for the peers we discover. We use the disc_callback
* pointer as that flag. Peers already discovered are created here.
*
* The lport lock is held during this call. The callback must be done
* later, without holding either the lport or discovery locks.
* The fcoe_ctlr lock may also be held during this call.
*/
static void fcoe_ctlr_disc_start(void (*callback)(struct fc_lport *,
enum fc_disc_event),
struct fc_lport *lport)
{
struct fc_disc *disc = &lport->disc;
struct fcoe_ctlr *fip = disc->priv;
mutex_lock(&disc->disc_mutex);
disc->disc_callback = callback;
disc->disc_id = (disc->disc_id + 2) | 1;
disc->pending = 1;
schedule_work(&fip->timer_work);
mutex_unlock(&disc->disc_mutex);
}
/**
* fcoe_ctlr_vn_disc() - report FIP VN_port discovery results after claim state.
* @fip: The FCoE controller
*
* Starts the FLOGI and PLOGI login process to each discovered rport for which
* we've received at least one beacon.
* Performs the discovery complete callback.
*/
static void fcoe_ctlr_vn_disc(struct fcoe_ctlr *fip)
{
struct fc_lport *lport = fip->lp;
struct fc_disc *disc = &lport->disc;
struct fc_rport_priv *rdata;
struct fcoe_rport *frport;
void (*callback)(struct fc_lport *, enum fc_disc_event);
mutex_lock(&disc->disc_mutex);
callback = disc->pending ? disc->disc_callback : NULL;
disc->pending = 0;
mutex_unlock(&disc->disc_mutex);
rcu_read_lock();
list_for_each_entry_rcu(rdata, &disc->rports, peers) {
if (!kref_get_unless_zero(&rdata->kref))
continue;
frport = fcoe_ctlr_rport(rdata);
if (frport->time)
fc_rport_login(rdata);
kref_put(&rdata->kref, fc_rport_destroy);
}
rcu_read_unlock();
if (callback)
callback(lport, DISC_EV_SUCCESS);
}
/**
* fcoe_ctlr_vn_timeout - timer work function for VN2VN mode.
* @fip: The FCoE controller
*/
static void fcoe_ctlr_vn_timeout(struct fcoe_ctlr *fip)
{
unsigned long next_time;
u8 mac[ETH_ALEN];
u32 new_port_id = 0;
mutex_lock(&fip->ctlr_mutex);
switch (fip->state) {
case FIP_ST_VNMP_START:
fcoe_ctlr_set_state(fip, FIP_ST_VNMP_PROBE1);
LIBFCOE_FIP_DBG(fip, "vn_timeout: send 1st probe request\n");
fcoe_ctlr_vn_send(fip, FIP_SC_VN_PROBE_REQ, fcoe_all_vn2vn, 0);
next_time = jiffies + msecs_to_jiffies(FIP_VN_PROBE_WAIT);
break;
case FIP_ST_VNMP_PROBE1:
fcoe_ctlr_set_state(fip, FIP_ST_VNMP_PROBE2);
LIBFCOE_FIP_DBG(fip, "vn_timeout: send 2nd probe request\n");
fcoe_ctlr_vn_send(fip, FIP_SC_VN_PROBE_REQ, fcoe_all_vn2vn, 0);
next_time = jiffies + msecs_to_jiffies(FIP_VN_ANN_WAIT);
break;
case FIP_ST_VNMP_PROBE2:
fcoe_ctlr_set_state(fip, FIP_ST_VNMP_CLAIM);
new_port_id = fip->port_id;
hton24(mac, FIP_VN_FC_MAP);
hton24(mac + 3, new_port_id);
fcoe_ctlr_map_dest(fip);
fip->update_mac(fip->lp, mac);
LIBFCOE_FIP_DBG(fip, "vn_timeout: send claim notify\n");
fcoe_ctlr_vn_send_claim(fip);
next_time = jiffies + msecs_to_jiffies(FIP_VN_ANN_WAIT);
break;
case FIP_ST_VNMP_CLAIM:
/*
* This may be invoked either by starting discovery so don't
* go to the next state unless it's been long enough.
*/
next_time = fip->sol_time + msecs_to_jiffies(FIP_VN_ANN_WAIT);
if (time_after_eq(jiffies, next_time)) {
fcoe_ctlr_set_state(fip, FIP_ST_VNMP_UP);
LIBFCOE_FIP_DBG(fip, "vn_timeout: send vn2vn beacon\n");
fcoe_ctlr_vn_send(fip, FIP_SC_VN_BEACON,
fcoe_all_vn2vn, 0);
next_time = jiffies + msecs_to_jiffies(FIP_VN_ANN_WAIT);
fip->port_ka_time = next_time;
}
fcoe_ctlr_vn_disc(fip);
break;
case FIP_ST_VNMP_UP:
next_time = fcoe_ctlr_vn_age(fip);
if (time_after_eq(jiffies, fip->port_ka_time)) {
LIBFCOE_FIP_DBG(fip, "vn_timeout: send vn2vn beacon\n");
fcoe_ctlr_vn_send(fip, FIP_SC_VN_BEACON,
fcoe_all_vn2vn, 0);
fip->port_ka_time = jiffies +
msecs_to_jiffies(FIP_VN_BEACON_INT +
(prandom_u32() % FIP_VN_BEACON_FUZZ));
}
if (time_before(fip->port_ka_time, next_time))
next_time = fip->port_ka_time;
break;
case FIP_ST_LINK_WAIT:
goto unlock;
default:
WARN(1, "unexpected state %d\n", fip->state);
goto unlock;
}
mod_timer(&fip->timer, next_time);
unlock:
mutex_unlock(&fip->ctlr_mutex);
/* If port ID is new, notify local port after dropping ctlr_mutex */
if (new_port_id)
fc_lport_set_local_id(fip->lp, new_port_id);
}
/**
* fcoe_ctlr_mode_set() - Set or reset the ctlr's mode
* @lport: The local port to be (re)configured
* @fip: The FCoE controller whose mode is changing
* @fip_mode: The new fip mode
*
* Note that the we shouldn't be changing the libfc discovery settings
* (fc_disc_config) while an lport is going through the libfc state
* machine. The mode can only be changed when a fcoe_ctlr device is
* disabled, so that should ensure that this routine is only called
* when nothing is happening.
*/
static void fcoe_ctlr_mode_set(struct fc_lport *lport, struct fcoe_ctlr *fip,
enum fip_mode fip_mode)
{
void *priv;
WARN_ON(lport->state != LPORT_ST_RESET &&
lport->state != LPORT_ST_DISABLED);
if (fip_mode == FIP_MODE_VN2VN) {
lport->rport_priv_size = sizeof(struct fcoe_rport);
lport->point_to_multipoint = 1;
lport->tt.disc_recv_req = fcoe_ctlr_disc_recv;
lport->tt.disc_start = fcoe_ctlr_disc_start;
lport->tt.disc_stop = fcoe_ctlr_disc_stop;
lport->tt.disc_stop_final = fcoe_ctlr_disc_stop_final;
priv = fip;
} else {
lport->rport_priv_size = 0;
lport->point_to_multipoint = 0;
lport->tt.disc_recv_req = NULL;
lport->tt.disc_start = NULL;
lport->tt.disc_stop = NULL;
lport->tt.disc_stop_final = NULL;
priv = lport;
}
fc_disc_config(lport, priv);
}
/**
* fcoe_libfc_config() - Sets up libfc related properties for local port
* @lport: The local port to configure libfc for
* @fip: The FCoE controller in use by the local port
* @tt: The libfc function template
* @init_fcp: If non-zero, the FCP portion of libfc should be initialized
*
* Returns : 0 for success
*/
int fcoe_libfc_config(struct fc_lport *lport, struct fcoe_ctlr *fip,
const struct libfc_function_template *tt, int init_fcp)
{
/* Set the function pointers set by the LLDD */
memcpy(&lport->tt, tt, sizeof(*tt));
if (init_fcp && fc_fcp_init(lport))
return -ENOMEM;
fc_exch_init(lport);
fc_elsct_init(lport);
fc_lport_init(lport);
fc_disc_init(lport);
fcoe_ctlr_mode_set(lport, fip, fip->mode);
return 0;
}
EXPORT_SYMBOL_GPL(fcoe_libfc_config);
void fcoe_fcf_get_selected(struct fcoe_fcf_device *fcf_dev)
{
struct fcoe_ctlr_device *ctlr_dev = fcoe_fcf_dev_to_ctlr_dev(fcf_dev);
struct fcoe_ctlr *fip = fcoe_ctlr_device_priv(ctlr_dev);
struct fcoe_fcf *fcf;
mutex_lock(&fip->ctlr_mutex);
mutex_lock(&ctlr_dev->lock);
fcf = fcoe_fcf_device_priv(fcf_dev);
if (fcf)
fcf_dev->selected = (fcf == fip->sel_fcf) ? 1 : 0;
else
fcf_dev->selected = 0;
mutex_unlock(&ctlr_dev->lock);
mutex_unlock(&fip->ctlr_mutex);
}
EXPORT_SYMBOL(fcoe_fcf_get_selected);
void fcoe_ctlr_set_fip_mode(struct fcoe_ctlr_device *ctlr_dev)
{
struct fcoe_ctlr *ctlr = fcoe_ctlr_device_priv(ctlr_dev);
struct fc_lport *lport = ctlr->lp;
mutex_lock(&ctlr->ctlr_mutex);
switch (ctlr_dev->mode) {
case FIP_CONN_TYPE_VN2VN:
ctlr->mode = FIP_MODE_VN2VN;
break;
case FIP_CONN_TYPE_FABRIC:
default:
ctlr->mode = FIP_MODE_FABRIC;
break;
}
mutex_unlock(&ctlr->ctlr_mutex);
fcoe_ctlr_mode_set(lport, ctlr, ctlr->mode);
}
EXPORT_SYMBOL(fcoe_ctlr_set_fip_mode);
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