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linux/drivers/scsi/cxgb3i/cxgb3i_offload.h
Karen Xie f62d0896e6 [SCSI] cxgb3i: Outgoing pdus need to observe skb's MAX_SKB_FRAGS 
Need to make sure the outgoing pdu can fit into a single skb.  When
calulating the max. outgoing pdu payload size, take into consideration
of
- data can be held in the skb's fragment list, assume 512 bytes per
  fragment, and
- data can be held in the headroom.

Signed-off-by: Karen Xie <kxie@chelsio.com>
Reviewed-by: Mike Christie <michaelc@cs.wisc.edu>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
2009-02-21 20:29:37 -06:00

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/*
* cxgb3i_offload.h: Chelsio S3xx iscsi offloaded tcp connection management
*
* Copyright (C) 2003-2008 Chelsio Communications. All rights reserved.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the LICENSE file included in this
* release for licensing terms and conditions.
*
* Written by: Dimitris Michailidis (dm@chelsio.com)
* Karen Xie (kxie@chelsio.com)
*/
#ifndef _CXGB3I_OFFLOAD_H
#define _CXGB3I_OFFLOAD_H
#include <linux/skbuff.h>
#include <net/tcp.h>
#include "common.h"
#include "adapter.h"
#include "t3cdev.h"
#include "cxgb3_offload.h"
#define cxgb3i_log_error(fmt...) printk(KERN_ERR "cxgb3i: ERR! " fmt)
#define cxgb3i_log_warn(fmt...) printk(KERN_WARNING "cxgb3i: WARN! " fmt)
#define cxgb3i_log_info(fmt...) printk(KERN_INFO "cxgb3i: " fmt)
#define cxgb3i_log_debug(fmt, args...) \
printk(KERN_INFO "cxgb3i: %s - " fmt, __func__ , ## args)
/**
* struct s3_conn - an iscsi tcp connection structure
*
* @dev: net device of with connection
* @cdev: adapter t3cdev for net device
* @flags: see c3cn_flags below
* @tid: connection id assigned by the h/w
* @qset: queue set used by connection
* @mss_idx: Maximum Segment Size table index
* @l2t: ARP resolution entry for offload packets
* @wr_max: maximum in-flight writes
* @wr_avail: number of writes available
* @wr_unacked: writes since last request for completion notification
* @wr_pending_head: head of pending write queue
* @wr_pending_tail: tail of pending write queue
* @cpl_close: skb for cpl_close_req
* @cpl_abort_req: skb for cpl_abort_req
* @cpl_abort_rpl: skb for cpl_abort_rpl
* @lock: connection status lock
* @refcnt: reference count on connection
* @state: connection state
* @saddr: source ip/port address
* @daddr: destination ip/port address
* @dst_cache: reference to destination route
* @receive_queue: received PDUs
* @write_queue: un-pushed pending writes
* @retry_timer: retry timer for various operations
* @err: connection error status
* @callback_lock: lock for opaque user context
* @user_data: opaque user context
* @rcv_nxt: next receive seq. #
* @copied_seq: head of yet unread data
* @rcv_wup: rcv_nxt on last window update sent
* @snd_nxt: next sequence we send
* @snd_una: first byte we want an ack for
* @write_seq: tail+1 of data held in send buffer
*/
struct s3_conn {
struct net_device *dev;
struct t3cdev *cdev;
unsigned long flags;
int tid;
int qset;
int mss_idx;
struct l2t_entry *l2t;
int wr_max;
int wr_avail;
int wr_unacked;
struct sk_buff *wr_pending_head;
struct sk_buff *wr_pending_tail;
struct sk_buff *cpl_close;
struct sk_buff *cpl_abort_req;
struct sk_buff *cpl_abort_rpl;
spinlock_t lock;
atomic_t refcnt;
volatile unsigned int state;
struct sockaddr_in saddr;
struct sockaddr_in daddr;
struct dst_entry *dst_cache;
struct sk_buff_head receive_queue;
struct sk_buff_head write_queue;
struct timer_list retry_timer;
int err;
rwlock_t callback_lock;
void *user_data;
u32 rcv_nxt;
u32 copied_seq;
u32 rcv_wup;
u32 snd_nxt;
u32 snd_una;
u32 write_seq;
};
/*
* connection state
*/
enum conn_states {
C3CN_STATE_CONNECTING = 1,
C3CN_STATE_ESTABLISHED,
C3CN_STATE_ACTIVE_CLOSE,
C3CN_STATE_PASSIVE_CLOSE,
C3CN_STATE_CLOSE_WAIT_1,
C3CN_STATE_CLOSE_WAIT_2,
C3CN_STATE_ABORTING,
C3CN_STATE_CLOSED,
};
static inline unsigned int c3cn_is_closing(const struct s3_conn *c3cn)
{
return c3cn->state >= C3CN_STATE_ACTIVE_CLOSE;
}
static inline unsigned int c3cn_is_established(const struct s3_conn *c3cn)
{
return c3cn->state == C3CN_STATE_ESTABLISHED;
}
/*
* Connection flags -- many to track some close related events.
*/
enum c3cn_flags {
C3CN_ABORT_RPL_RCVD, /* received one ABORT_RPL_RSS message */
C3CN_ABORT_REQ_RCVD, /* received one ABORT_REQ_RSS message */
C3CN_ABORT_RPL_PENDING, /* expecting an abort reply */
C3CN_TX_DATA_SENT, /* already sent a TX_DATA WR */
C3CN_ACTIVE_CLOSE_NEEDED, /* need to be closed */
};
/**
* cxgb3i_sdev_data - Per adapter data.
* Linked off of each Ethernet device port on the adapter.
* Also available via the t3cdev structure since we have pointers to our port
* net_device's there ...
*
* @list: list head to link elements
* @cdev: t3cdev adapter
* @client: CPL client pointer
* @ports: array of adapter ports
* @sport_map_next: next index into the port map
* @sport_map: source port map
*/
struct cxgb3i_sdev_data {
struct list_head list;
struct t3cdev *cdev;
struct cxgb3_client *client;
struct adap_ports ports;
unsigned int sport_map_next;
unsigned long sport_map[0];
};
#define NDEV2CDATA(ndev) (*(struct cxgb3i_sdev_data **)&(ndev)->ec_ptr)
#define CXGB3_SDEV_DATA(cdev) NDEV2CDATA((cdev)->lldev)
void cxgb3i_sdev_cleanup(void);
int cxgb3i_sdev_init(cxgb3_cpl_handler_func *);
void cxgb3i_sdev_add(struct t3cdev *, struct cxgb3_client *);
void cxgb3i_sdev_remove(struct t3cdev *);
struct s3_conn *cxgb3i_c3cn_create(void);
int cxgb3i_c3cn_connect(struct s3_conn *, struct sockaddr_in *);
void cxgb3i_c3cn_rx_credits(struct s3_conn *, int);
int cxgb3i_c3cn_send_pdus(struct s3_conn *, struct sk_buff *);
void cxgb3i_c3cn_release(struct s3_conn *);
/**
* cxgb3_skb_cb - control block for received pdu state and ULP mode management.
*
* @flag: see C3CB_FLAG_* below
* @ulp_mode: ULP mode/submode of sk_buff
* @seq: tcp sequence number
*/
struct cxgb3_skb_rx_cb {
__u32 ddigest; /* data digest */
__u32 pdulen; /* recovered pdu length */
};
struct cxgb3_skb_tx_cb {
struct sk_buff *wr_next; /* next wr */
};
struct cxgb3_skb_cb {
__u8 flags;
__u8 ulp_mode;
__u32 seq;
union {
struct cxgb3_skb_rx_cb rx;
struct cxgb3_skb_tx_cb tx;
};
};
#define CXGB3_SKB_CB(skb) ((struct cxgb3_skb_cb *)&((skb)->cb[0]))
#define skb_flags(skb) (CXGB3_SKB_CB(skb)->flags)
#define skb_ulp_mode(skb) (CXGB3_SKB_CB(skb)->ulp_mode)
#define skb_tcp_seq(skb) (CXGB3_SKB_CB(skb)->seq)
#define skb_rx_ddigest(skb) (CXGB3_SKB_CB(skb)->rx.ddigest)
#define skb_rx_pdulen(skb) (CXGB3_SKB_CB(skb)->rx.pdulen)
#define skb_tx_wr_next(skb) (CXGB3_SKB_CB(skb)->tx.wr_next)
enum c3cb_flags {
C3CB_FLAG_NEED_HDR = 1 << 0, /* packet needs a TX_DATA_WR header */
C3CB_FLAG_NO_APPEND = 1 << 1, /* don't grow this skb */
C3CB_FLAG_COMPL = 1 << 2, /* request WR completion */
};
/**
* sge_opaque_hdr -
* Opaque version of structure the SGE stores at skb->head of TX_DATA packets
* and for which we must reserve space.
*/
struct sge_opaque_hdr {
void *dev;
dma_addr_t addr[MAX_SKB_FRAGS + 1];
};
/* for TX: a skb must have a headroom of at least TX_HEADER_LEN bytes */
#define TX_HEADER_LEN \
(sizeof(struct tx_data_wr) + sizeof(struct sge_opaque_hdr))
#define SKB_TX_HEADROOM SKB_MAX_HEAD(TX_HEADER_LEN)
/*
* get and set private ip for iscsi traffic
*/
#define cxgb3i_get_private_ipv4addr(ndev) \
(((struct port_info *)(netdev_priv(ndev)))->iscsi_ipv4addr)
#define cxgb3i_set_private_ipv4addr(ndev, addr) \
(((struct port_info *)(netdev_priv(ndev)))->iscsi_ipv4addr) = addr
/* max. connections per adapter */
#define CXGB3I_MAX_CONN 16384
#endif /* _CXGB3_OFFLOAD_H */
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