drivers/scsi/cxgb3i/cxgb3i_offload.h

   1 /*
   2  * cxgb3i_offload.h: Chelsio S3xx iscsi offloaded tcp connection management
   3  *
   4  * Copyright (C) 2003-2008 Chelsio Communications.  All rights reserved.
   5  *
   6  * This program is distributed in the hope that it will be useful, but WITHOUT
   7  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
   8  * FITNESS FOR A PARTICULAR PURPOSE.  See the LICENSE file included in this
   9  * release for licensing terms and conditions.
  10  *
  11  * Written by:  Dimitris Michailidis (dm@chelsio.com)
  12  *              Karen Xie (kxie@chelsio.com)
  13  */
  14
  15 #ifndef _CXGB3I_OFFLOAD_H
  16 #define _CXGB3I_OFFLOAD_H
  17
  18 #include <linux/skbuff.h>
  19 #include <linux/in.h>
  20
  21 #include "common.h"
  22 #include "adapter.h"
  23 #include "t3cdev.h"
  24 #include "cxgb3_offload.h"
  25
  26 #define cxgb3i_log_error(fmt...) printk(KERN_ERR "cxgb3i: ERR! " fmt)
  27 #define cxgb3i_log_warn(fmt...)  printk(KERN_WARNING "cxgb3i: WARN! " fmt)
  28 #define cxgb3i_log_info(fmt...)  printk(KERN_INFO "cxgb3i: " fmt)
  29 #define cxgb3i_log_debug(fmt, args...) \
  30         printk(KERN_INFO "cxgb3i: %s - " fmt, __func__ , ## args)
  31
  32 /**
  33  * struct s3_conn - an iscsi tcp connection structure
  34  *
  35  * @dev:        net device of with connection
  36  * @cdev:       adapter t3cdev for net device
  37  * @flags:      see c3cn_flags below
  38  * @tid:        connection id assigned by the h/w
  39  * @qset:       queue set used by connection
  40  * @mss_idx:    Maximum Segment Size table index
  41  * @l2t:        ARP resolution entry for offload packets
  42  * @wr_max:     maximum in-flight writes
  43  * @wr_avail:   number of writes available
  44  * @wr_unacked: writes since last request for completion notification
  45  * @wr_pending_head: head of pending write queue
  46  * @wr_pending_tail: tail of pending write queue
  47  * @cpl_close:  skb for cpl_close_req
  48  * @cpl_abort_req: skb for cpl_abort_req
  49  * @cpl_abort_rpl: skb for cpl_abort_rpl
  50  * @lock:       connection status lock
  51  * @refcnt:     reference count on connection
  52  * @state:      connection state
  53  * @saddr:      source ip/port address
  54  * @daddr:      destination ip/port address
  55  * @dst_cache:  reference to destination route
  56  * @receive_queue: received PDUs
  57  * @write_queue: un-pushed pending writes
  58  * @retry_timer: retry timer for various operations
  59  * @err:        connection error status
  60  * @callback_lock: lock for opaque user context
  61  * @user_data:  opaque user context
  62  * @rcv_nxt:    next receive seq. #
  63  * @copied_seq: head of yet unread data
  64  * @rcv_wup:    rcv_nxt on last window update sent
  65  * @snd_nxt:    next sequence we send
  66  * @snd_una:    first byte we want an ack for
  67  * @write_seq:  tail+1 of data held in send buffer
  68  */
  69 struct s3_conn {
  70         struct net_device *dev;
  71         struct t3cdev *cdev;
  72         unsigned long flags;
  73         int tid;
  74         int qset;
  75         int mss_idx;
  76         struct l2t_entry *l2t;
  77         int wr_max;
  78         int wr_avail;
  79         int wr_unacked;
  80         struct sk_buff *wr_pending_head;
  81         struct sk_buff *wr_pending_tail;
  82         struct sk_buff *cpl_close;
  83         struct sk_buff *cpl_abort_req;
  84         struct sk_buff *cpl_abort_rpl;
  85         spinlock_t lock;
  86         atomic_t refcnt;
  87         volatile unsigned int state;
  88         struct sockaddr_in saddr;
  89         struct sockaddr_in daddr;
  90         struct dst_entry *dst_cache;
  91         struct sk_buff_head receive_queue;
  92         struct sk_buff_head write_queue;
  93         struct timer_list retry_timer;
  94         int err;
  95         rwlock_t callback_lock;
  96         void *user_data;
  97
  98         u32 rcv_nxt;
  99         u32 copied_seq;
 100         u32 rcv_wup;
 101         u32 snd_nxt;
 102         u32 snd_una;
 103         u32 write_seq;
 104 };
 105
 106 /*
 107  * connection state
 108  */
 109 enum conn_states {
 110         C3CN_STATE_CONNECTING = 1,
 111         C3CN_STATE_ESTABLISHED,
 112         C3CN_STATE_ACTIVE_CLOSE,
 113         C3CN_STATE_PASSIVE_CLOSE,
 114         C3CN_STATE_CLOSE_WAIT_1,
 115         C3CN_STATE_CLOSE_WAIT_2,
 116         C3CN_STATE_ABORTING,
 117         C3CN_STATE_CLOSED,
 118 };
 119
 120 static inline unsigned int c3cn_is_closing(const struct s3_conn *c3cn)
 121 {
 122         return c3cn->state >= C3CN_STATE_ACTIVE_CLOSE;
 123 }
 124 static inline unsigned int c3cn_is_established(const struct s3_conn *c3cn)
 125 {
 126         return c3cn->state == C3CN_STATE_ESTABLISHED;
 127 }
 128
 129 /*
 130  * Connection flags -- many to track some close related events.
 131  */
 132 enum c3cn_flags {
 133         C3CN_ABORT_RPL_RCVD,    /* received one ABORT_RPL_RSS message */
 134         C3CN_ABORT_REQ_RCVD,    /* received one ABORT_REQ_RSS message */
 135         C3CN_ABORT_RPL_PENDING, /* expecting an abort reply */
 136         C3CN_TX_DATA_SENT,      /* already sent a TX_DATA WR */
 137         C3CN_ACTIVE_CLOSE_NEEDED,       /* need to be closed */
 138         C3CN_OFFLOAD_DOWN       /* offload function off */
 139 };
 140
 141 /**
 142  * cxgb3i_sdev_data - Per adapter data.
 143  * Linked off of each Ethernet device port on the adapter.
 144  * Also available via the t3cdev structure since we have pointers to our port
 145  * net_device's there ...
 146  *
 147  * @list:       list head to link elements
 148  * @cdev:       t3cdev adapter
 149  * @client:     CPL client pointer
 150  * @ports:      array of adapter ports
 151  * @sport_next: next port
 152  * @sport_conn: source port connection
 153  */
 154 struct cxgb3i_sdev_data {
 155         struct list_head list;
 156         struct t3cdev *cdev;
 157         struct cxgb3_client *client;
 158         struct adap_ports ports;
 159         spinlock_t lock;
 160         unsigned int sport_next;
 161         struct s3_conn *sport_conn[0];
 162 };
 163 #define NDEV2CDATA(ndev) (*(struct cxgb3i_sdev_data **)&(ndev)->ec_ptr)
 164 #define CXGB3_SDEV_DATA(cdev) NDEV2CDATA((cdev)->lldev)
 165
 166 void cxgb3i_sdev_cleanup(void);
 167 int cxgb3i_sdev_init(cxgb3_cpl_handler_func *);
 168 void cxgb3i_sdev_add(struct t3cdev *, struct cxgb3_client *);
 169 void cxgb3i_sdev_remove(struct t3cdev *);
 170
 171 struct s3_conn *cxgb3i_c3cn_create(void);
 172 int cxgb3i_c3cn_connect(struct net_device *, struct s3_conn *,
 173                         struct sockaddr_in *);
 174 void cxgb3i_c3cn_rx_credits(struct s3_conn *, int);
 175 int cxgb3i_c3cn_send_pdus(struct s3_conn *, struct sk_buff *);
 176 void cxgb3i_c3cn_release(struct s3_conn *);
 177
 178 /**
 179  * cxgb3_skb_cb - control block for received pdu state and ULP mode management.
 180  *
 181  * @flag:       see C3CB_FLAG_* below
 182  * @ulp_mode:   ULP mode/submode of sk_buff
 183  * @seq:        tcp sequence number
 184  */
 185 struct cxgb3_skb_rx_cb {
 186         __u32 ddigest;                  /* data digest */
 187         __u32 pdulen;                   /* recovered pdu length */
 188 };
 189
 190 struct cxgb3_skb_tx_cb {
 191         struct sk_buff *wr_next;        /* next wr */
 192 };
 193
 194 struct cxgb3_skb_cb {
 195         __u8 flags;
 196         __u8 ulp_mode;
 197         __u32 seq;
 198         union {
 199                 struct cxgb3_skb_rx_cb rx;
 200                 struct cxgb3_skb_tx_cb tx;
 201         };
 202 };
 203
 204 #define CXGB3_SKB_CB(skb)       ((struct cxgb3_skb_cb *)&((skb)->cb[0]))
 205 #define skb_flags(skb)          (CXGB3_SKB_CB(skb)->flags)
 206 #define skb_ulp_mode(skb)       (CXGB3_SKB_CB(skb)->ulp_mode)
 207 #define skb_tcp_seq(skb)        (CXGB3_SKB_CB(skb)->seq)
 208 #define skb_rx_ddigest(skb)     (CXGB3_SKB_CB(skb)->rx.ddigest)
 209 #define skb_rx_pdulen(skb)      (CXGB3_SKB_CB(skb)->rx.pdulen)
 210 #define skb_tx_wr_next(skb)     (CXGB3_SKB_CB(skb)->tx.wr_next)
 211
 212 enum c3cb_flags {
 213         C3CB_FLAG_NEED_HDR = 1 << 0,    /* packet needs a TX_DATA_WR header */
 214         C3CB_FLAG_NO_APPEND = 1 << 1,   /* don't grow this skb */
 215         C3CB_FLAG_COMPL = 1 << 2,       /* request WR completion */
 216 };
 217
 218 /**
 219  * sge_opaque_hdr -
 220  * Opaque version of structure the SGE stores at skb->head of TX_DATA packets
 221  * and for which we must reserve space.
 222  */
 223 struct sge_opaque_hdr {
 224         void *dev;
 225         dma_addr_t addr[MAX_SKB_FRAGS + 1];
 226 };
 227
 228 /* for TX: a skb must have a headroom of at least TX_HEADER_LEN bytes */
 229 #define TX_HEADER_LEN \
 230                 (sizeof(struct tx_data_wr) + sizeof(struct sge_opaque_hdr))
 231 #define SKB_TX_HEADROOM         SKB_MAX_HEAD(TX_HEADER_LEN)
 232
 233 /*
 234  * get and set private ip for iscsi traffic
 235  */
 236 #define cxgb3i_get_private_ipv4addr(ndev) \
 237         (((struct port_info *)(netdev_priv(ndev)))->iscsi_ipv4addr)
 238 #define cxgb3i_set_private_ipv4addr(ndev, addr) \
 239         (((struct port_info *)(netdev_priv(ndev)))->iscsi_ipv4addr) = addr
 240
 241 /* max. connections per adapter */
 242 #define CXGB3I_MAX_CONN         16384
 243 #endif /* _CXGB3_OFFLOAD_H */