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linux/drivers/scsi/cxgb3i/cxgb3i_offload.h
Mike Christie 10eb0f013c [SCSI] iscsi: pass ep connect shost 
When we create the tcp/ip connection by calling ep_connect, we currently
just go by the routing table info.

I think there are two problems with this.

1. Some drivers do not have access to a routing table. Some drivers like
qla4xxx do not even know about other ports.

2. If you have two initiator ports on the same subnet, the user may have
set things up so that session1 was supposed to be run through port1. and
session2 was supposed to be run through port2. It looks like we could
end with both sessions going through one of the ports.

Fixes for cxgb3i from Karen Xie.

Signed-off-by: Mike Christie <michaelc@cs.wisc.edu>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
2009-05-23 15:44:09 -05:00

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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 <linux/in.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 */
C3CN_OFFLOAD_DOWN /* offload function off */
};
/**
* 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_next: next port
* @sport_conn: source port connection
*/
struct cxgb3i_sdev_data {
struct list_head list;
struct t3cdev *cdev;
struct cxgb3_client *client;
struct adap_ports ports;
spinlock_t lock;
unsigned int sport_next;
struct s3_conn *sport_conn[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 net_device *, 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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