drivers/scsi/cxgbi/libcxgbi.h

   1 /*
   2  * libcxgbi.h: Chelsio common library for T3/T4 iSCSI driver.
   3  *
   4  * Copyright (c) 2010-2015 Chelsio Communications, Inc.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation.
   9  *
  10  * Written by: Karen Xie (kxie@chelsio.com)
  11  * Written by: Rakesh Ranjan (rranjan@chelsio.com)
  12  */
  13
  14 #ifndef __LIBCXGBI_H__
  15 #define __LIBCXGBI_H__
  16
  17 #include <linux/kernel.h>
  18 #include <linux/errno.h>
  19 #include <linux/types.h>
  20 #include <linux/debugfs.h>
  21 #include <linux/list.h>
  22 #include <linux/netdevice.h>
  23 #include <linux/if_vlan.h>
  24 #include <linux/scatterlist.h>
  25 #include <linux/skbuff.h>
  26 #include <linux/vmalloc.h>
  27 #include <linux/version.h>
  28 #include <scsi/scsi_device.h>
  29 #include <scsi/libiscsi_tcp.h>
  30
  31 #include <libcxgb_ppm.h>
  32
  33 enum cxgbi_dbg_flag {
  34         CXGBI_DBG_ISCSI,
  35         CXGBI_DBG_DDP,
  36         CXGBI_DBG_TOE,
  37         CXGBI_DBG_SOCK,
  38
  39         CXGBI_DBG_PDU_TX,
  40         CXGBI_DBG_PDU_RX,
  41         CXGBI_DBG_DEV,
  42 };
  43
  44 #define log_debug(level, fmt, ...)      \
  45         do {    \
  46                 if (dbg_level & (level)) \
  47                         pr_info(fmt, ##__VA_ARGS__); \
  48         } while (0)
  49
  50 #define pr_info_ipaddr(fmt_trail,                                       \
  51                         addr1, addr2, args_trail...)                    \
  52 do {                                                                    \
  53         if (!((1 << CXGBI_DBG_SOCK) & dbg_level))                       \
  54                 break;                                                  \
  55         pr_info("%pISpc - %pISpc, " fmt_trail,                          \
  56                 addr1, addr2, args_trail);                              \
  57 } while (0)
  58
  59 /* max. connections per adapter */
  60 #define CXGBI_MAX_CONN          16384
  61
  62 /* always allocate rooms for AHS */
  63 #define SKB_TX_ISCSI_PDU_HEADER_MAX     \
  64         (sizeof(struct iscsi_hdr) + ISCSI_MAX_AHS_SIZE)
  65
  66 #define ISCSI_PDU_NONPAYLOAD_LEN        312 /* bhs(48) + ahs(256) + digest(8)*/
  67
  68 /*
  69  * align pdu size to multiple of 512 for better performance
  70  */
  71 #define cxgbi_align_pdu_size(n) do { n = (n) & (~511); } while (0)
  72
  73 #define ULP2_MODE_ISCSI         2
  74
  75 #define ULP2_MAX_PKT_SIZE       16224
  76 #define ULP2_MAX_PDU_PAYLOAD    \
  77         (ULP2_MAX_PKT_SIZE - ISCSI_PDU_NONPAYLOAD_LEN)
  78
  79 #define CXGBI_ULP2_MAX_ISO_PAYLOAD      65535
  80
  81 #define CXGBI_MAX_ISO_DATA_IN_SKB       \
  82         min_t(u32, MAX_SKB_FRAGS << PAGE_SHIFT, CXGBI_ULP2_MAX_ISO_PAYLOAD)
  83
  84 #define cxgbi_is_iso_config(csk)        ((csk)->cdev->skb_iso_txhdr)
  85 #define cxgbi_is_iso_disabled(csk)      ((csk)->disable_iso)
  86
  87 /*
  88  * For iscsi connections HW may inserts digest bytes into the pdu. Those digest
  89  * bytes are not sent by the host but are part of the TCP payload and therefore
  90  * consume TCP sequence space.
  91  */
  92 static const unsigned int ulp2_extra_len[] = { 0, 4, 4, 8 };
  93 static inline unsigned int cxgbi_ulp_extra_len(int submode)
  94 {
  95         return ulp2_extra_len[submode & 3];
  96 }
  97
  98 #define CPL_RX_DDP_STATUS_DDP_SHIFT     16 /* ddp'able */
  99 #define CPL_RX_DDP_STATUS_PAD_SHIFT     19 /* pad error */
 100 #define CPL_RX_DDP_STATUS_HCRC_SHIFT    20 /* hcrc error */
 101 #define CPL_RX_DDP_STATUS_DCRC_SHIFT    21 /* dcrc error */
 102
 103 /*
 104  * sge_opaque_hdr -
 105  * Opaque version of structure the SGE stores at skb->head of TX_DATA packets
 106  * and for which we must reserve space.
 107  */
 108 struct sge_opaque_hdr {
 109         void *dev;
 110         dma_addr_t addr[MAX_SKB_FRAGS + 1];
 111 };
 112
 113 struct cxgbi_sock {
 114         struct cxgbi_device *cdev;
 115
 116         int tid;
 117         int atid;
 118         unsigned long flags;
 119         unsigned int mtu;
 120         unsigned short rss_qid;
 121         unsigned short txq_idx;
 122         unsigned short advmss;
 123         unsigned int tx_chan;
 124         unsigned int rx_chan;
 125         unsigned int mss_idx;
 126         unsigned int smac_idx;
 127         unsigned char port_id;
 128         int wr_max_cred;
 129         int wr_cred;
 130         int wr_una_cred;
 131 #ifdef CONFIG_CHELSIO_T4_DCB
 132         u8 dcb_priority;
 133 #endif
 134         unsigned char hcrc_len;
 135         unsigned char dcrc_len;
 136
 137         void *l2t;
 138         struct sk_buff *wr_pending_head;
 139         struct sk_buff *wr_pending_tail;
 140         struct sk_buff *cpl_close;
 141         struct sk_buff *cpl_abort_req;
 142         struct sk_buff *cpl_abort_rpl;
 143         struct sk_buff *skb_ulp_lhdr;
 144         spinlock_t lock;
 145         struct kref refcnt;
 146         unsigned int state;
 147         unsigned int csk_family;
 148         union {
 149                 struct sockaddr_in saddr;
 150                 struct sockaddr_in6 saddr6;
 151         };
 152         union {
 153                 struct sockaddr_in daddr;
 154                 struct sockaddr_in6 daddr6;
 155         };
 156         struct dst_entry *dst;
 157         struct sk_buff_head receive_queue;
 158         struct sk_buff_head write_queue;
 159         struct timer_list retry_timer;
 160         struct completion cmpl;
 161         int err;
 162         rwlock_t callback_lock;
 163         void *user_data;
 164
 165         u32 rcv_nxt;
 166         u32 copied_seq;
 167         u32 rcv_wup;
 168         u32 snd_nxt;
 169         u32 snd_una;
 170         u32 write_seq;
 171         u32 snd_win;
 172         u32 rcv_win;
 173
 174         bool disable_iso;
 175         u32 no_tx_credits;
 176         unsigned long prev_iso_ts;
 177 };
 178
 179 /*
 180  * connection states
 181  */
 182 enum cxgbi_sock_states{
 183         CTP_CLOSED,
 184         CTP_CONNECTING,
 185         CTP_ACTIVE_OPEN,
 186         CTP_ESTABLISHED,
 187         CTP_ACTIVE_CLOSE,
 188         CTP_PASSIVE_CLOSE,
 189         CTP_CLOSE_WAIT_1,
 190         CTP_CLOSE_WAIT_2,
 191         CTP_ABORTING,
 192 };
 193
 194 /*
 195  * Connection flags -- many to track some close related events.
 196  */
 197 enum cxgbi_sock_flags {
 198         CTPF_ABORT_RPL_RCVD,    /*received one ABORT_RPL_RSS message */
 199         CTPF_ABORT_REQ_RCVD,    /*received one ABORT_REQ_RSS message */
 200         CTPF_ABORT_RPL_PENDING, /* expecting an abort reply */
 201         CTPF_TX_DATA_SENT,      /* already sent a TX_DATA WR */
 202         CTPF_ACTIVE_CLOSE_NEEDED,/* need to be closed */
 203         CTPF_HAS_ATID,          /* reserved atid */
 204         CTPF_HAS_TID,           /* reserved hw tid */
 205         CTPF_OFFLOAD_DOWN,      /* offload function off */
 206         CTPF_LOGOUT_RSP_RCVD,   /* received logout response */
 207 };
 208
 209 struct cxgbi_skb_rx_cb {
 210         __u32 ddigest;
 211         __u32 pdulen;
 212 };
 213
 214 struct cxgbi_skb_tx_cb {
 215         void *handle;
 216         void *arp_err_handler;
 217         struct sk_buff *wr_next;
 218         u16 iscsi_hdr_len;
 219         u8 ulp_mode;
 220 };
 221
 222 enum cxgbi_skcb_flags {
 223         SKCBF_TX_NEED_HDR,      /* packet needs a header */
 224         SKCBF_TX_MEM_WRITE,     /* memory write */
 225         SKCBF_TX_FLAG_COMPL,    /* wr completion flag */
 226         SKCBF_RX_COALESCED,     /* received whole pdu */
 227         SKCBF_RX_HDR,           /* received pdu header */
 228         SKCBF_RX_DATA,          /* received pdu payload */
 229         SKCBF_RX_STATUS,        /* received ddp status */
 230         SKCBF_RX_ISCSI_COMPL,   /* received iscsi completion */
 231         SKCBF_RX_DATA_DDPD,     /* pdu payload ddp'd */
 232         SKCBF_RX_HCRC_ERR,      /* header digest error */
 233         SKCBF_RX_DCRC_ERR,      /* data digest error */
 234         SKCBF_RX_PAD_ERR,       /* padding byte error */
 235         SKCBF_TX_ISO,           /* iso cpl in tx skb */
 236 };
 237
 238 struct cxgbi_skb_cb {
 239         union {
 240                 struct cxgbi_skb_rx_cb rx;
 241                 struct cxgbi_skb_tx_cb tx;
 242         };
 243         unsigned long flags;
 244         unsigned int seq;
 245 };
 246
 247 #define CXGBI_SKB_CB(skb)       ((struct cxgbi_skb_cb *)&((skb)->cb[0]))
 248 #define cxgbi_skcb_flags(skb)           (CXGBI_SKB_CB(skb)->flags)
 249 #define cxgbi_skcb_tcp_seq(skb)         (CXGBI_SKB_CB(skb)->seq)
 250 #define cxgbi_skcb_rx_ddigest(skb)      (CXGBI_SKB_CB(skb)->rx.ddigest)
 251 #define cxgbi_skcb_rx_pdulen(skb)       (CXGBI_SKB_CB(skb)->rx.pdulen)
 252 #define cxgbi_skcb_tx_wr_next(skb)      (CXGBI_SKB_CB(skb)->tx.wr_next)
 253 #define cxgbi_skcb_tx_iscsi_hdrlen(skb) (CXGBI_SKB_CB(skb)->tx.iscsi_hdr_len)
 254 #define cxgbi_skcb_tx_ulp_mode(skb)     (CXGBI_SKB_CB(skb)->tx.ulp_mode)
 255
 256 static inline void cxgbi_skcb_set_flag(struct sk_buff *skb,
 257                                         enum cxgbi_skcb_flags flag)
 258 {
 259         __set_bit(flag, &(cxgbi_skcb_flags(skb)));
 260 }
 261
 262 static inline void cxgbi_skcb_clear_flag(struct sk_buff *skb,
 263                                         enum cxgbi_skcb_flags flag)
 264 {
 265         __clear_bit(flag, &(cxgbi_skcb_flags(skb)));
 266 }
 267
 268 static inline int cxgbi_skcb_test_flag(const struct sk_buff *skb,
 269                                        enum cxgbi_skcb_flags flag)
 270 {
 271         return test_bit(flag, &(cxgbi_skcb_flags(skb)));
 272 }
 273
 274 static inline void cxgbi_sock_set_flag(struct cxgbi_sock *csk,
 275                                         enum cxgbi_sock_flags flag)
 276 {
 277         __set_bit(flag, &csk->flags);
 278         log_debug(1 << CXGBI_DBG_SOCK,
 279                 "csk 0x%p,%u,0x%lx, bit %d.\n",
 280                 csk, csk->state, csk->flags, flag);
 281 }
 282
 283 static inline void cxgbi_sock_clear_flag(struct cxgbi_sock *csk,
 284                                         enum cxgbi_sock_flags flag)
 285 {
 286         __clear_bit(flag, &csk->flags);
 287         log_debug(1 << CXGBI_DBG_SOCK,
 288                 "csk 0x%p,%u,0x%lx, bit %d.\n",
 289                 csk, csk->state, csk->flags, flag);
 290 }
 291
 292 static inline int cxgbi_sock_flag(struct cxgbi_sock *csk,
 293                                 enum cxgbi_sock_flags flag)
 294 {
 295         if (csk == NULL)
 296                 return 0;
 297         return test_bit(flag, &csk->flags);
 298 }
 299
 300 static inline void cxgbi_sock_set_state(struct cxgbi_sock *csk, int state)
 301 {
 302         log_debug(1 << CXGBI_DBG_SOCK,
 303                 "csk 0x%p,%u,0x%lx, state -> %u.\n",
 304                 csk, csk->state, csk->flags, state);
 305         csk->state = state;
 306 }
 307
 308 static inline void cxgbi_sock_free(struct kref *kref)
 309 {
 310         struct cxgbi_sock *csk = container_of(kref,
 311                                                 struct cxgbi_sock,
 312                                                 refcnt);
 313         if (csk) {
 314                 log_debug(1 << CXGBI_DBG_SOCK,
 315                         "free csk 0x%p, state %u, flags 0x%lx\n",
 316                         csk, csk->state, csk->flags);
 317                 kfree(csk);
 318         }
 319 }
 320
 321 static inline void __cxgbi_sock_put(const char *fn, struct cxgbi_sock *csk)
 322 {
 323         log_debug(1 << CXGBI_DBG_SOCK,
 324                 "%s, put csk 0x%p, ref %u-1.\n",
 325                 fn, csk, kref_read(&csk->refcnt));
 326         kref_put(&csk->refcnt, cxgbi_sock_free);
 327 }
 328 #define cxgbi_sock_put(csk)     __cxgbi_sock_put(__func__, csk)
 329
 330 static inline void __cxgbi_sock_get(const char *fn, struct cxgbi_sock *csk)
 331 {
 332         log_debug(1 << CXGBI_DBG_SOCK,
 333                 "%s, get csk 0x%p, ref %u+1.\n",
 334                 fn, csk, kref_read(&csk->refcnt));
 335         kref_get(&csk->refcnt);
 336 }
 337 #define cxgbi_sock_get(csk)     __cxgbi_sock_get(__func__, csk)
 338
 339 static inline int cxgbi_sock_is_closing(struct cxgbi_sock *csk)
 340 {
 341         return csk->state >= CTP_ACTIVE_CLOSE;
 342 }
 343
 344 static inline int cxgbi_sock_is_established(struct cxgbi_sock *csk)
 345 {
 346         return csk->state == CTP_ESTABLISHED;
 347 }
 348
 349 static inline void cxgbi_sock_purge_write_queue(struct cxgbi_sock *csk)
 350 {
 351         struct sk_buff *skb;
 352
 353         while ((skb = __skb_dequeue(&csk->write_queue)))
 354                 __kfree_skb(skb);
 355 }
 356
 357 static inline unsigned int cxgbi_sock_compute_wscale(unsigned int win)
 358 {
 359         unsigned int wscale = 0;
 360
 361         while (wscale < 14 && (65535 << wscale) < win)
 362                 wscale++;
 363         return wscale;
 364 }
 365
 366 static inline struct sk_buff *alloc_wr(int wrlen, int dlen, gfp_t gfp)
 367 {
 368         struct sk_buff *skb = alloc_skb(wrlen + dlen, gfp);
 369
 370         if (skb) {
 371                 __skb_put(skb, wrlen);
 372                 memset(skb->head, 0, wrlen + dlen);
 373         } else
 374                 pr_info("alloc cpl wr skb %u+%u, OOM.\n", wrlen, dlen);
 375         return skb;
 376 }
 377
 378
 379 /*
 380  * The number of WRs needed for an skb depends on the number of fragments
 381  * in the skb and whether it has any payload in its main body.  This maps the
 382  * length of the gather list represented by an skb into the # of necessary WRs.
 383  * The extra two fragments are for iscsi bhs and payload padding.
 384  */
 385 #define SKB_WR_LIST_SIZE         (MAX_SKB_FRAGS + 2)
 386
 387 static inline void cxgbi_sock_reset_wr_list(struct cxgbi_sock *csk)
 388 {
 389         csk->wr_pending_head = csk->wr_pending_tail = NULL;
 390 }
 391
 392 static inline void cxgbi_sock_enqueue_wr(struct cxgbi_sock *csk,
 393                                           struct sk_buff *skb)
 394 {
 395         cxgbi_skcb_tx_wr_next(skb) = NULL;
 396         /*
 397          * We want to take an extra reference since both us and the driver
 398          * need to free the packet before it's really freed.
 399          */
 400         skb_get(skb);
 401
 402         if (!csk->wr_pending_head)
 403                 csk->wr_pending_head = skb;
 404         else
 405                 cxgbi_skcb_tx_wr_next(csk->wr_pending_tail) = skb;
 406         csk->wr_pending_tail = skb;
 407 }
 408
 409 static inline int cxgbi_sock_count_pending_wrs(const struct cxgbi_sock *csk)
 410 {
 411         int n = 0;
 412         const struct sk_buff *skb = csk->wr_pending_head;
 413
 414         while (skb) {
 415                 n += skb->csum;
 416                 skb = cxgbi_skcb_tx_wr_next(skb);
 417         }
 418         return n;
 419 }
 420
 421 static inline struct sk_buff *cxgbi_sock_peek_wr(const struct cxgbi_sock *csk)
 422 {
 423         return csk->wr_pending_head;
 424 }
 425
 426 static inline struct sk_buff *cxgbi_sock_dequeue_wr(struct cxgbi_sock *csk)
 427 {
 428         struct sk_buff *skb = csk->wr_pending_head;
 429
 430         if (likely(skb)) {
 431                 csk->wr_pending_head = cxgbi_skcb_tx_wr_next(skb);
 432                 cxgbi_skcb_tx_wr_next(skb) = NULL;
 433         }
 434         return skb;
 435 }
 436
 437 void cxgbi_sock_check_wr_invariants(const struct cxgbi_sock *);
 438 void cxgbi_sock_purge_wr_queue(struct cxgbi_sock *);
 439 void cxgbi_sock_skb_entail(struct cxgbi_sock *, struct sk_buff *);
 440 void cxgbi_sock_fail_act_open(struct cxgbi_sock *, int);
 441 void cxgbi_sock_act_open_req_arp_failure(void *, struct sk_buff *);
 442 void cxgbi_sock_closed(struct cxgbi_sock *);
 443 void cxgbi_sock_established(struct cxgbi_sock *, unsigned int, unsigned int);
 444 void cxgbi_sock_rcv_abort_rpl(struct cxgbi_sock *);
 445 void cxgbi_sock_rcv_peer_close(struct cxgbi_sock *);
 446 void cxgbi_sock_rcv_close_conn_rpl(struct cxgbi_sock *, u32);
 447 void cxgbi_sock_rcv_wr_ack(struct cxgbi_sock *, unsigned int, unsigned int,
 448                                 int);
 449 unsigned int cxgbi_sock_select_mss(struct cxgbi_sock *, unsigned int);
 450 void cxgbi_sock_free_cpl_skbs(struct cxgbi_sock *);
 451
 452 struct cxgbi_hba {
 453         struct net_device *ndev;
 454         struct net_device *vdev;        /* vlan dev */
 455         struct Scsi_Host *shost;
 456         struct cxgbi_device *cdev;
 457         __be32 ipv4addr;
 458         unsigned char port_id;
 459 };
 460
 461 struct cxgbi_ports_map {
 462         unsigned int max_connect;
 463         unsigned int used;
 464         unsigned short sport_base;
 465         spinlock_t lock;
 466         unsigned int next;
 467         struct cxgbi_sock **port_csk;
 468 };
 469
 470 #define CXGBI_FLAG_DEV_T3               0x1
 471 #define CXGBI_FLAG_DEV_T4               0x2
 472 #define CXGBI_FLAG_ADAPTER_RESET        0x4
 473 #define CXGBI_FLAG_IPV4_SET             0x10
 474 #define CXGBI_FLAG_USE_PPOD_OFLDQ       0x40
 475 #define CXGBI_FLAG_DDP_OFF              0x100
 476 #define CXGBI_FLAG_DEV_ISO_OFF          0x400
 477
 478 struct cxgbi_device {
 479         struct list_head list_head;
 480         struct list_head rcu_node;
 481         unsigned int flags;
 482         struct net_device **ports;
 483         void *lldev;
 484         struct cxgbi_hba **hbas;
 485         const unsigned short *mtus;
 486         unsigned char nmtus;
 487         unsigned char nports;
 488         struct pci_dev *pdev;
 489         struct dentry *debugfs_root;
 490         struct iscsi_transport *itp;
 491         struct module *owner;
 492
 493         unsigned int pfvf;
 494         unsigned int rx_credit_thres;
 495         unsigned int skb_tx_rsvd;
 496         u32 skb_iso_txhdr;
 497         unsigned int skb_rx_extra;      /* for msg coalesced mode */
 498         unsigned int tx_max_size;
 499         unsigned int rx_max_size;
 500         unsigned int rxq_idx_cntr;
 501         struct cxgbi_ports_map pmap;
 502
 503         void (*dev_ddp_cleanup)(struct cxgbi_device *);
 504         struct cxgbi_ppm* (*cdev2ppm)(struct cxgbi_device *);
 505         int (*csk_ddp_set_map)(struct cxgbi_ppm *, struct cxgbi_sock *,
 506                                struct cxgbi_task_tag_info *);
 507         void (*csk_ddp_clear_map)(struct cxgbi_device *cdev,
 508                                   struct cxgbi_ppm *,
 509                                   struct cxgbi_task_tag_info *);
 510         int (*csk_ddp_setup_digest)(struct cxgbi_sock *,
 511                                     unsigned int, int, int);
 512         int (*csk_ddp_setup_pgidx)(struct cxgbi_sock *,
 513                                    unsigned int, int);
 514
 515         void (*csk_release_offload_resources)(struct cxgbi_sock *);
 516         int (*csk_rx_pdu_ready)(struct cxgbi_sock *, struct sk_buff *);
 517         u32 (*csk_send_rx_credits)(struct cxgbi_sock *, u32);
 518         int (*csk_push_tx_frames)(struct cxgbi_sock *, int);
 519         void (*csk_send_abort_req)(struct cxgbi_sock *);
 520         void (*csk_send_close_req)(struct cxgbi_sock *);
 521         int (*csk_alloc_cpls)(struct cxgbi_sock *);
 522         int (*csk_init_act_open)(struct cxgbi_sock *);
 523
 524         void *dd_data;
 525 };
 526 #define cxgbi_cdev_priv(cdev)   ((cdev)->dd_data)
 527
 528 struct cxgbi_conn {
 529         struct cxgbi_endpoint *cep;
 530         struct iscsi_conn *iconn;
 531         struct cxgbi_hba *chba;
 532         u32 task_idx_bits;
 533         unsigned int ddp_full;
 534         unsigned int ddp_tag_full;
 535 };
 536
 537 struct cxgbi_endpoint {
 538         struct cxgbi_conn *cconn;
 539         struct cxgbi_hba *chba;
 540         struct cxgbi_sock *csk;
 541 };
 542
 543 struct cxgbi_task_data {
 544 #define CXGBI_TASK_SGL_CHECKED  0x1
 545 #define CXGBI_TASK_SGL_COPY     0x2
 546         u8 flags;
 547         unsigned short nr_frags;
 548         struct page_frag frags[MAX_SKB_FRAGS];
 549         struct sk_buff *skb;
 550         unsigned int dlen;
 551         unsigned int offset;
 552         unsigned int count;
 553         unsigned int sgoffset;
 554         u32 total_count;
 555         u32 total_offset;
 556         u32 max_xmit_dlength;
 557         struct cxgbi_task_tag_info ttinfo;
 558 };
 559 #define iscsi_task_cxgbi_data(task) \
 560         ((task)->dd_data + sizeof(struct iscsi_tcp_task))
 561
 562 struct cxgbi_iso_info {
 563 #define CXGBI_ISO_INFO_FSLICE           0x1
 564 #define CXGBI_ISO_INFO_LSLICE           0x2
 565 #define CXGBI_ISO_INFO_IMM_ENABLE       0x4
 566         u8 flags;
 567         u8 op;
 568         u8 ahs;
 569         u8 num_pdu;
 570         u32 mpdu;
 571         u32 burst_size;
 572         u32 len;
 573         u32 segment_offset;
 574         u32 datasn_offset;
 575         u32 buffer_offset;
 576 };
 577
 578 static inline void cxgbi_set_iscsi_ipv4(struct cxgbi_hba *chba, __be32 ipaddr)
 579 {
 580         if (chba->cdev->flags & CXGBI_FLAG_IPV4_SET)
 581                 chba->ipv4addr = ipaddr;
 582         else
 583                 pr_info("set iscsi ipv4 NOT supported, using %s ipv4.\n",
 584                         chba->ndev->name);
 585 }
 586
 587 struct cxgbi_device *cxgbi_device_register(unsigned int, unsigned int);
 588 void cxgbi_device_unregister(struct cxgbi_device *);
 589 void cxgbi_device_unregister_all(unsigned int flag);
 590 struct cxgbi_device *cxgbi_device_find_by_lldev(void *);
 591 struct cxgbi_device *cxgbi_device_find_by_netdev(struct net_device *, int *);
 592 struct cxgbi_device *cxgbi_device_find_by_netdev_rcu(struct net_device *,
 593                                                      int *);
 594 int cxgbi_hbas_add(struct cxgbi_device *, u64, unsigned int,
 595                         struct scsi_host_template *,
 596                         struct scsi_transport_template *);
 597 void cxgbi_hbas_remove(struct cxgbi_device *);
 598
 599 int cxgbi_device_portmap_create(struct cxgbi_device *cdev, unsigned int base,
 600                         unsigned int max_conn);
 601 void cxgbi_device_portmap_cleanup(struct cxgbi_device *cdev);
 602
 603 void cxgbi_conn_tx_open(struct cxgbi_sock *);
 604 void cxgbi_conn_pdu_ready(struct cxgbi_sock *);
 605 int cxgbi_conn_alloc_pdu(struct iscsi_task *, u8);
 606 int cxgbi_conn_init_pdu(struct iscsi_task *, unsigned int , unsigned int);
 607 int cxgbi_conn_xmit_pdu(struct iscsi_task *);
 608
 609 void cxgbi_cleanup_task(struct iscsi_task *task);
 610
 611 umode_t cxgbi_attr_is_visible(int param_type, int param);
 612 void cxgbi_get_conn_stats(struct iscsi_cls_conn *, struct iscsi_stats *);
 613 int cxgbi_set_conn_param(struct iscsi_cls_conn *,
 614                         enum iscsi_param, char *, int);
 615 int cxgbi_get_ep_param(struct iscsi_endpoint *ep, enum iscsi_param, char *);
 616 struct iscsi_cls_conn *cxgbi_create_conn(struct iscsi_cls_session *, u32);
 617 int cxgbi_bind_conn(struct iscsi_cls_session *,
 618                         struct iscsi_cls_conn *, u64, int);
 619 void cxgbi_destroy_session(struct iscsi_cls_session *);
 620 struct iscsi_cls_session *cxgbi_create_session(struct iscsi_endpoint *,
 621                         u16, u16, u32);
 622 int cxgbi_set_host_param(struct Scsi_Host *,
 623                         enum iscsi_host_param, char *, int);
 624 int cxgbi_get_host_param(struct Scsi_Host *, enum iscsi_host_param, char *);
 625 struct iscsi_endpoint *cxgbi_ep_connect(struct Scsi_Host *,
 626                         struct sockaddr *, int);
 627 int cxgbi_ep_poll(struct iscsi_endpoint *, int);
 628 void cxgbi_ep_disconnect(struct iscsi_endpoint *);
 629
 630 int cxgbi_iscsi_init(struct iscsi_transport *,
 631                         struct scsi_transport_template **);
 632 void cxgbi_iscsi_cleanup(struct iscsi_transport *,
 633                         struct scsi_transport_template **);
 634 void cxgbi_parse_pdu_itt(struct iscsi_conn *, itt_t, int *, int *);
 635 int cxgbi_ddp_init(struct cxgbi_device *, unsigned int, unsigned int,
 636                         unsigned int, unsigned int);
 637 int cxgbi_ddp_cleanup(struct cxgbi_device *);
 638 void cxgbi_ddp_page_size_factor(int *);
 639 void cxgbi_ddp_set_one_ppod(struct cxgbi_pagepod *,
 640                             struct cxgbi_task_tag_info *,
 641                             struct scatterlist **sg_pp, unsigned int *sg_off);
 642 int cxgbi_ddp_ppm_setup(void **ppm_pp, struct cxgbi_device *cdev,
 643                         struct cxgbi_tag_format *tformat,
 644                         unsigned int iscsi_size, unsigned int llimit,
 645                         unsigned int start, unsigned int rsvd_factor,
 646                         unsigned int edram_start, unsigned int edram_size);
 647 #endif  /*__LIBCXGBI_H__*/