drivers/scsi/cxgbi/libcxgbi.h

   1 /*
   2  * libcxgbi.h: Chelsio common library for T3/T4 iSCSI driver.
   3  *
   4  * Copyright (c) 2010 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 <scsi/scsi_device.h>
  28 #include <scsi/libiscsi_tcp.h>
  29
  30 enum cxgbi_dbg_flag {
  31         CXGBI_DBG_ISCSI,
  32         CXGBI_DBG_DDP,
  33         CXGBI_DBG_TOE,
  34         CXGBI_DBG_SOCK,
  35
  36         CXGBI_DBG_PDU_TX,
  37         CXGBI_DBG_PDU_RX,
  38         CXGBI_DBG_DEV,
  39 };
  40
  41 #define log_debug(level, fmt, ...)      \
  42         do {    \
  43                 if (dbg_level & (level)) \
  44                         pr_info(fmt, ##__VA_ARGS__); \
  45         } while (0)
  46
  47 #define pr_info_ipaddr(fmt_trail,                                       \
  48                         addr1, addr2, args_trail...)                    \
  49 do {                                                                    \
  50         if (!((1 << CXGBI_DBG_SOCK) & dbg_level))                       \
  51                 break;                                                  \
  52         pr_info("%pISpc - %pISpc, " fmt_trail,                          \
  53                 addr1, addr2, args_trail);                              \
  54 } while (0)
  55
  56 /* max. connections per adapter */
  57 #define CXGBI_MAX_CONN          16384
  58
  59 /* always allocate rooms for AHS */
  60 #define SKB_TX_ISCSI_PDU_HEADER_MAX     \
  61         (sizeof(struct iscsi_hdr) + ISCSI_MAX_AHS_SIZE)
  62
  63 #define ISCSI_PDU_NONPAYLOAD_LEN        312 /* bhs(48) + ahs(256) + digest(8)*/
  64
  65 /*
  66  * align pdu size to multiple of 512 for better performance
  67  */
  68 #define cxgbi_align_pdu_size(n) do { n = (n) & (~511); } while (0)
  69
  70 #define ULP2_MODE_ISCSI         2
  71
  72 #define ULP2_MAX_PKT_SIZE       16224
  73 #define ULP2_MAX_PDU_PAYLOAD    \
  74         (ULP2_MAX_PKT_SIZE - ISCSI_PDU_NONPAYLOAD_LEN)
  75
  76 /*
  77  * For iscsi connections HW may inserts digest bytes into the pdu. Those digest
  78  * bytes are not sent by the host but are part of the TCP payload and therefore
  79  * consume TCP sequence space.
  80  */
  81 static const unsigned int ulp2_extra_len[] = { 0, 4, 4, 8 };
  82 static inline unsigned int cxgbi_ulp_extra_len(int submode)
  83 {
  84         return ulp2_extra_len[submode & 3];
  85 }
  86
  87 /*
  88  * struct pagepod_hdr, pagepod - pagepod format
  89  */
  90
  91 #define CPL_RX_DDP_STATUS_DDP_SHIFT     16 /* ddp'able */
  92 #define CPL_RX_DDP_STATUS_PAD_SHIFT     19 /* pad error */
  93 #define CPL_RX_DDP_STATUS_HCRC_SHIFT    20 /* hcrc error */
  94 #define CPL_RX_DDP_STATUS_DCRC_SHIFT    21 /* dcrc error */
  95
  96 struct cxgbi_pagepod_hdr {
  97         u32 vld_tid;
  98         u32 pgsz_tag_clr;
  99         u32 max_offset;
 100         u32 page_offset;
 101         u64 rsvd;
 102 };
 103
 104 #define PPOD_PAGES_MAX                  4
 105 struct cxgbi_pagepod {
 106         struct cxgbi_pagepod_hdr hdr;
 107         u64 addr[PPOD_PAGES_MAX + 1];
 108 };
 109
 110 struct cxgbi_tag_format {
 111         unsigned char sw_bits;
 112         unsigned char rsvd_bits;
 113         unsigned char rsvd_shift;
 114         unsigned char filler[1];
 115         u32 rsvd_mask;
 116 };
 117
 118 struct cxgbi_gather_list {
 119         unsigned int tag;
 120         unsigned int length;
 121         unsigned int offset;
 122         unsigned int nelem;
 123         struct page **pages;
 124         dma_addr_t phys_addr[0];
 125 };
 126
 127 struct cxgbi_ddp_info {
 128         struct kref refcnt;
 129         struct cxgbi_device *cdev;
 130         struct pci_dev *pdev;
 131         unsigned int max_txsz;
 132         unsigned int max_rxsz;
 133         unsigned int llimit;
 134         unsigned int ulimit;
 135         unsigned int nppods;
 136         unsigned int idx_last;
 137         unsigned char idx_bits;
 138         unsigned char filler[3];
 139         unsigned int idx_mask;
 140         unsigned int rsvd_tag_mask;
 141         spinlock_t map_lock;
 142         struct cxgbi_gather_list **gl_map;
 143 };
 144
 145 #define DDP_PGIDX_MAX           4
 146 #define DDP_THRESHOLD           2048
 147
 148 #define PPOD_PAGES_SHIFT        2       /*  4 pages per pod */
 149
 150 #define PPOD_SIZE               sizeof(struct cxgbi_pagepod)  /*  64 */
 151 #define PPOD_SIZE_SHIFT         6
 152
 153 #define ULPMEM_DSGL_MAX_NPPODS  16      /*  1024/PPOD_SIZE */
 154 #define ULPMEM_IDATA_MAX_NPPODS 4       /*  256/PPOD_SIZE */
 155 #define PCIE_MEMWIN_MAX_NPPODS  16      /*  1024/PPOD_SIZE */
 156
 157 #define PPOD_COLOR_SHIFT        0
 158 #define PPOD_COLOR(x)           ((x) << PPOD_COLOR_SHIFT)
 159
 160 #define PPOD_IDX_SHIFT          6
 161 #define PPOD_IDX_MAX_SIZE       24
 162
 163 #define PPOD_TID_SHIFT          0
 164 #define PPOD_TID(x)             ((x) << PPOD_TID_SHIFT)
 165
 166 #define PPOD_TAG_SHIFT          6
 167 #define PPOD_TAG(x)             ((x) << PPOD_TAG_SHIFT)
 168
 169 #define PPOD_VALID_SHIFT        24
 170 #define PPOD_VALID(x)           ((x) << PPOD_VALID_SHIFT)
 171 #define PPOD_VALID_FLAG         PPOD_VALID(1U)
 172
 173 /*
 174  * sge_opaque_hdr -
 175  * Opaque version of structure the SGE stores at skb->head of TX_DATA packets
 176  * and for which we must reserve space.
 177  */
 178 struct sge_opaque_hdr {
 179         void *dev;
 180         dma_addr_t addr[MAX_SKB_FRAGS + 1];
 181 };
 182
 183 struct cxgbi_sock {
 184         struct cxgbi_device *cdev;
 185
 186         int tid;
 187         int atid;
 188         unsigned long flags;
 189         unsigned int mtu;
 190         unsigned short rss_qid;
 191         unsigned short txq_idx;
 192         unsigned short advmss;
 193         unsigned int tx_chan;
 194         unsigned int rx_chan;
 195         unsigned int mss_idx;
 196         unsigned int smac_idx;
 197         unsigned char port_id;
 198         int wr_max_cred;
 199         int wr_cred;
 200         int wr_una_cred;
 201         unsigned char hcrc_len;
 202         unsigned char dcrc_len;
 203
 204         void *l2t;
 205         struct sk_buff *wr_pending_head;
 206         struct sk_buff *wr_pending_tail;
 207         struct sk_buff *cpl_close;
 208         struct sk_buff *cpl_abort_req;
 209         struct sk_buff *cpl_abort_rpl;
 210         struct sk_buff *skb_ulp_lhdr;
 211         spinlock_t lock;
 212         struct kref refcnt;
 213         unsigned int state;
 214         unsigned int csk_family;
 215         union {
 216                 struct sockaddr_in saddr;
 217                 struct sockaddr_in6 saddr6;
 218         };
 219         union {
 220                 struct sockaddr_in daddr;
 221                 struct sockaddr_in6 daddr6;
 222         };
 223         struct dst_entry *dst;
 224         struct sk_buff_head receive_queue;
 225         struct sk_buff_head write_queue;
 226         struct timer_list retry_timer;
 227         int err;
 228         rwlock_t callback_lock;
 229         void *user_data;
 230
 231         u32 rcv_nxt;
 232         u32 copied_seq;
 233         u32 rcv_wup;
 234         u32 snd_nxt;
 235         u32 snd_una;
 236         u32 write_seq;
 237 };
 238
 239 /*
 240  * connection states
 241  */
 242 enum cxgbi_sock_states{
 243         CTP_CLOSED,
 244         CTP_CONNECTING,
 245         CTP_ACTIVE_OPEN,
 246         CTP_ESTABLISHED,
 247         CTP_ACTIVE_CLOSE,
 248         CTP_PASSIVE_CLOSE,
 249         CTP_CLOSE_WAIT_1,
 250         CTP_CLOSE_WAIT_2,
 251         CTP_ABORTING,
 252 };
 253
 254 /*
 255  * Connection flags -- many to track some close related events.
 256  */
 257 enum cxgbi_sock_flags {
 258         CTPF_ABORT_RPL_RCVD,    /*received one ABORT_RPL_RSS message */
 259         CTPF_ABORT_REQ_RCVD,    /*received one ABORT_REQ_RSS message */
 260         CTPF_ABORT_RPL_PENDING, /* expecting an abort reply */
 261         CTPF_TX_DATA_SENT,      /* already sent a TX_DATA WR */
 262         CTPF_ACTIVE_CLOSE_NEEDED,/* need to be closed */
 263         CTPF_HAS_ATID,          /* reserved atid */
 264         CTPF_HAS_TID,           /* reserved hw tid */
 265         CTPF_OFFLOAD_DOWN,      /* offload function off */
 266 };
 267
 268 struct cxgbi_skb_rx_cb {
 269         __u32 ddigest;
 270         __u32 pdulen;
 271 };
 272
 273 struct cxgbi_skb_tx_cb {
 274         void *l2t;
 275         struct sk_buff *wr_next;
 276 };
 277
 278 enum cxgbi_skcb_flags {
 279         SKCBF_TX_NEED_HDR,      /* packet needs a header */
 280         SKCBF_RX_COALESCED,     /* received whole pdu */
 281         SKCBF_RX_HDR,           /* received pdu header */
 282         SKCBF_RX_DATA,          /* received pdu payload */
 283         SKCBF_RX_STATUS,        /* received ddp status */
 284         SKCBF_RX_DATA_DDPD,     /* pdu payload ddp'd */
 285         SKCBF_RX_HCRC_ERR,      /* header digest error */
 286         SKCBF_RX_DCRC_ERR,      /* data digest error */
 287         SKCBF_RX_PAD_ERR,       /* padding byte error */
 288 };
 289
 290 struct cxgbi_skb_cb {
 291         unsigned char ulp_mode;
 292         unsigned long flags;
 293         unsigned int seq;
 294         union {
 295                 struct cxgbi_skb_rx_cb rx;
 296                 struct cxgbi_skb_tx_cb tx;
 297         };
 298 };
 299
 300 #define CXGBI_SKB_CB(skb)       ((struct cxgbi_skb_cb *)&((skb)->cb[0]))
 301 #define cxgbi_skcb_flags(skb)           (CXGBI_SKB_CB(skb)->flags)
 302 #define cxgbi_skcb_ulp_mode(skb)        (CXGBI_SKB_CB(skb)->ulp_mode)
 303 #define cxgbi_skcb_tcp_seq(skb)         (CXGBI_SKB_CB(skb)->seq)
 304 #define cxgbi_skcb_rx_ddigest(skb)      (CXGBI_SKB_CB(skb)->rx.ddigest)
 305 #define cxgbi_skcb_rx_pdulen(skb)       (CXGBI_SKB_CB(skb)->rx.pdulen)
 306 #define cxgbi_skcb_tx_wr_next(skb)      (CXGBI_SKB_CB(skb)->tx.wr_next)
 307
 308 static inline void cxgbi_skcb_set_flag(struct sk_buff *skb,
 309                                         enum cxgbi_skcb_flags flag)
 310 {
 311         __set_bit(flag, &(cxgbi_skcb_flags(skb)));
 312 }
 313
 314 static inline void cxgbi_skcb_clear_flag(struct sk_buff *skb,
 315                                         enum cxgbi_skcb_flags flag)
 316 {
 317         __clear_bit(flag, &(cxgbi_skcb_flags(skb)));
 318 }
 319
 320 static inline int cxgbi_skcb_test_flag(const struct sk_buff *skb,
 321                                        enum cxgbi_skcb_flags flag)
 322 {
 323         return test_bit(flag, &(cxgbi_skcb_flags(skb)));
 324 }
 325
 326 static inline void cxgbi_sock_set_flag(struct cxgbi_sock *csk,
 327                                         enum cxgbi_sock_flags flag)
 328 {
 329         __set_bit(flag, &csk->flags);
 330         log_debug(1 << CXGBI_DBG_SOCK,
 331                 "csk 0x%p,%u,0x%lx, bit %d.\n",
 332                 csk, csk->state, csk->flags, flag);
 333 }
 334
 335 static inline void cxgbi_sock_clear_flag(struct cxgbi_sock *csk,
 336                                         enum cxgbi_sock_flags flag)
 337 {
 338         __clear_bit(flag, &csk->flags);
 339         log_debug(1 << CXGBI_DBG_SOCK,
 340                 "csk 0x%p,%u,0x%lx, bit %d.\n",
 341                 csk, csk->state, csk->flags, flag);
 342 }
 343
 344 static inline int cxgbi_sock_flag(struct cxgbi_sock *csk,
 345                                 enum cxgbi_sock_flags flag)
 346 {
 347         if (csk == NULL)
 348                 return 0;
 349         return test_bit(flag, &csk->flags);
 350 }
 351
 352 static inline void cxgbi_sock_set_state(struct cxgbi_sock *csk, int state)
 353 {
 354         log_debug(1 << CXGBI_DBG_SOCK,
 355                 "csk 0x%p,%u,0x%lx, state -> %u.\n",
 356                 csk, csk->state, csk->flags, state);
 357         csk->state = state;
 358 }
 359
 360 static inline void cxgbi_sock_free(struct kref *kref)
 361 {
 362         struct cxgbi_sock *csk = container_of(kref,
 363                                                 struct cxgbi_sock,
 364                                                 refcnt);
 365         if (csk) {
 366                 log_debug(1 << CXGBI_DBG_SOCK,
 367                         "free csk 0x%p, state %u, flags 0x%lx\n",
 368                         csk, csk->state, csk->flags);
 369                 kfree(csk);
 370         }
 371 }
 372
 373 static inline void __cxgbi_sock_put(const char *fn, struct cxgbi_sock *csk)
 374 {
 375         log_debug(1 << CXGBI_DBG_SOCK,
 376                 "%s, put csk 0x%p, ref %u-1.\n",
 377                 fn, csk, atomic_read(&csk->refcnt.refcount));
 378         kref_put(&csk->refcnt, cxgbi_sock_free);
 379 }
 380 #define cxgbi_sock_put(csk)     __cxgbi_sock_put(__func__, csk)
 381
 382 static inline void __cxgbi_sock_get(const char *fn, struct cxgbi_sock *csk)
 383 {
 384         log_debug(1 << CXGBI_DBG_SOCK,
 385                 "%s, get csk 0x%p, ref %u+1.\n",
 386                 fn, csk, atomic_read(&csk->refcnt.refcount));
 387         kref_get(&csk->refcnt);
 388 }
 389 #define cxgbi_sock_get(csk)     __cxgbi_sock_get(__func__, csk)
 390
 391 static inline int cxgbi_sock_is_closing(struct cxgbi_sock *csk)
 392 {
 393         return csk->state >= CTP_ACTIVE_CLOSE;
 394 }
 395
 396 static inline int cxgbi_sock_is_established(struct cxgbi_sock *csk)
 397 {
 398         return csk->state == CTP_ESTABLISHED;
 399 }
 400
 401 static inline void cxgbi_sock_purge_write_queue(struct cxgbi_sock *csk)
 402 {
 403         struct sk_buff *skb;
 404
 405         while ((skb = __skb_dequeue(&csk->write_queue)))
 406                 __kfree_skb(skb);
 407 }
 408
 409 static inline unsigned int cxgbi_sock_compute_wscale(unsigned int win)
 410 {
 411         unsigned int wscale = 0;
 412
 413         while (wscale < 14 && (65535 << wscale) < win)
 414                 wscale++;
 415         return wscale;
 416 }
 417
 418 static inline struct sk_buff *alloc_wr(int wrlen, int dlen, gfp_t gfp)
 419 {
 420         struct sk_buff *skb = alloc_skb(wrlen + dlen, gfp);
 421
 422         if (skb) {
 423                 __skb_put(skb, wrlen);
 424                 memset(skb->head, 0, wrlen + dlen);
 425         } else
 426                 pr_info("alloc cpl wr skb %u+%u, OOM.\n", wrlen, dlen);
 427         return skb;
 428 }
 429
 430
 431 /*
 432  * The number of WRs needed for an skb depends on the number of fragments
 433  * in the skb and whether it has any payload in its main body.  This maps the
 434  * length of the gather list represented by an skb into the # of necessary WRs.
 435  * The extra two fragments are for iscsi bhs and payload padding.
 436  */
 437 #define SKB_WR_LIST_SIZE         (MAX_SKB_FRAGS + 2)
 438
 439 static inline void cxgbi_sock_reset_wr_list(struct cxgbi_sock *csk)
 440 {
 441         csk->wr_pending_head = csk->wr_pending_tail = NULL;
 442 }
 443
 444 static inline void cxgbi_sock_enqueue_wr(struct cxgbi_sock *csk,
 445                                           struct sk_buff *skb)
 446 {
 447         cxgbi_skcb_tx_wr_next(skb) = NULL;
 448         /*
 449          * We want to take an extra reference since both us and the driver
 450          * need to free the packet before it's really freed. We know there's
 451          * just one user currently so we use atomic_set rather than skb_get
 452          * to avoid the atomic op.
 453          */
 454         atomic_set(&skb->users, 2);
 455
 456         if (!csk->wr_pending_head)
 457                 csk->wr_pending_head = skb;
 458         else
 459                 cxgbi_skcb_tx_wr_next(csk->wr_pending_tail) = skb;
 460         csk->wr_pending_tail = skb;
 461 }
 462
 463 static inline int cxgbi_sock_count_pending_wrs(const struct cxgbi_sock *csk)
 464 {
 465         int n = 0;
 466         const struct sk_buff *skb = csk->wr_pending_head;
 467
 468         while (skb) {
 469                 n += skb->csum;
 470                 skb = cxgbi_skcb_tx_wr_next(skb);
 471         }
 472         return n;
 473 }
 474
 475 static inline struct sk_buff *cxgbi_sock_peek_wr(const struct cxgbi_sock *csk)
 476 {
 477         return csk->wr_pending_head;
 478 }
 479
 480 static inline struct sk_buff *cxgbi_sock_dequeue_wr(struct cxgbi_sock *csk)
 481 {
 482         struct sk_buff *skb = csk->wr_pending_head;
 483
 484         if (likely(skb)) {
 485                 csk->wr_pending_head = cxgbi_skcb_tx_wr_next(skb);
 486                 cxgbi_skcb_tx_wr_next(skb) = NULL;
 487         }
 488         return skb;
 489 }
 490
 491 void cxgbi_sock_check_wr_invariants(const struct cxgbi_sock *);
 492 void cxgbi_sock_purge_wr_queue(struct cxgbi_sock *);
 493 void cxgbi_sock_skb_entail(struct cxgbi_sock *, struct sk_buff *);
 494 void cxgbi_sock_fail_act_open(struct cxgbi_sock *, int);
 495 void cxgbi_sock_act_open_req_arp_failure(void *, struct sk_buff *);
 496 void cxgbi_sock_closed(struct cxgbi_sock *);
 497 void cxgbi_sock_established(struct cxgbi_sock *, unsigned int, unsigned int);
 498 void cxgbi_sock_rcv_abort_rpl(struct cxgbi_sock *);
 499 void cxgbi_sock_rcv_peer_close(struct cxgbi_sock *);
 500 void cxgbi_sock_rcv_close_conn_rpl(struct cxgbi_sock *, u32);
 501 void cxgbi_sock_rcv_wr_ack(struct cxgbi_sock *, unsigned int, unsigned int,
 502                                 int);
 503 unsigned int cxgbi_sock_select_mss(struct cxgbi_sock *, unsigned int);
 504 void cxgbi_sock_free_cpl_skbs(struct cxgbi_sock *);
 505
 506 struct cxgbi_hba {
 507         struct net_device *ndev;
 508         struct net_device *vdev;        /* vlan dev */
 509         struct Scsi_Host *shost;
 510         struct cxgbi_device *cdev;
 511         __be32 ipv4addr;
 512         unsigned char port_id;
 513 };
 514
 515 struct cxgbi_ports_map {
 516         unsigned int max_connect;
 517         unsigned int used;
 518         unsigned short sport_base;
 519         spinlock_t lock;
 520         unsigned int next;
 521         struct cxgbi_sock **port_csk;
 522 };
 523
 524 #define CXGBI_FLAG_DEV_T3               0x1
 525 #define CXGBI_FLAG_DEV_T4               0x2
 526 #define CXGBI_FLAG_ADAPTER_RESET        0x4
 527 #define CXGBI_FLAG_IPV4_SET             0x10
 528 struct cxgbi_device {
 529         struct list_head list_head;
 530         struct list_head rcu_node;
 531         unsigned int flags;
 532         struct net_device **ports;
 533         void *lldev;
 534         struct cxgbi_hba **hbas;
 535         const unsigned short *mtus;
 536         unsigned char nmtus;
 537         unsigned char nports;
 538         struct pci_dev *pdev;
 539         struct dentry *debugfs_root;
 540         struct iscsi_transport *itp;
 541
 542         unsigned int pfvf;
 543         unsigned int snd_win;
 544         unsigned int rcv_win;
 545         unsigned int rx_credit_thres;
 546         unsigned int skb_tx_rsvd;
 547         unsigned int skb_rx_extra;      /* for msg coalesced mode */
 548         unsigned int tx_max_size;
 549         unsigned int rx_max_size;
 550         struct cxgbi_ports_map pmap;
 551         struct cxgbi_tag_format tag_format;
 552         struct cxgbi_ddp_info *ddp;
 553
 554         void (*dev_ddp_cleanup)(struct cxgbi_device *);
 555         int (*csk_ddp_set)(struct cxgbi_sock *, struct cxgbi_pagepod_hdr *,
 556                                 unsigned int, unsigned int,
 557                                 struct cxgbi_gather_list *);
 558         void (*csk_ddp_clear)(struct cxgbi_hba *,
 559                                 unsigned int, unsigned int, unsigned int);
 560         int (*csk_ddp_setup_digest)(struct cxgbi_sock *,
 561                                 unsigned int, int, int, int);
 562         int (*csk_ddp_setup_pgidx)(struct cxgbi_sock *,
 563                                 unsigned int, int, bool);
 564
 565         void (*csk_release_offload_resources)(struct cxgbi_sock *);
 566         int (*csk_rx_pdu_ready)(struct cxgbi_sock *, struct sk_buff *);
 567         u32 (*csk_send_rx_credits)(struct cxgbi_sock *, u32);
 568         int (*csk_push_tx_frames)(struct cxgbi_sock *, int);
 569         void (*csk_send_abort_req)(struct cxgbi_sock *);
 570         void (*csk_send_close_req)(struct cxgbi_sock *);
 571         int (*csk_alloc_cpls)(struct cxgbi_sock *);
 572         int (*csk_init_act_open)(struct cxgbi_sock *);
 573
 574         void *dd_data;
 575 };
 576 #define cxgbi_cdev_priv(cdev)   ((cdev)->dd_data)
 577
 578 struct cxgbi_conn {
 579         struct cxgbi_endpoint *cep;
 580         struct iscsi_conn *iconn;
 581         struct cxgbi_hba *chba;
 582         u32 task_idx_bits;
 583 };
 584
 585 struct cxgbi_endpoint {
 586         struct cxgbi_conn *cconn;
 587         struct cxgbi_hba *chba;
 588         struct cxgbi_sock *csk;
 589 };
 590
 591 #define MAX_PDU_FRAGS   ((ULP2_MAX_PDU_PAYLOAD + 512 - 1) / 512)
 592 struct cxgbi_task_data {
 593         unsigned short nr_frags;
 594         struct page_frag frags[MAX_PDU_FRAGS];
 595         struct sk_buff *skb;
 596         unsigned int offset;
 597         unsigned int count;
 598         unsigned int sgoffset;
 599 };
 600 #define iscsi_task_cxgbi_data(task) \
 601         ((task)->dd_data + sizeof(struct iscsi_tcp_task))
 602
 603 static inline int cxgbi_is_ddp_tag(struct cxgbi_tag_format *tformat, u32 tag)
 604 {
 605         return !(tag & (1 << (tformat->rsvd_bits + tformat->rsvd_shift - 1)));
 606 }
 607
 608 static inline int cxgbi_sw_tag_usable(struct cxgbi_tag_format *tformat,
 609                                         u32 sw_tag)
 610 {
 611         sw_tag >>= (32 - tformat->rsvd_bits);
 612         return !sw_tag;
 613 }
 614
 615 static inline u32 cxgbi_set_non_ddp_tag(struct cxgbi_tag_format *tformat,
 616                                         u32 sw_tag)
 617 {
 618         unsigned char shift = tformat->rsvd_bits + tformat->rsvd_shift - 1;
 619         u32 mask = (1 << shift) - 1;
 620
 621         if (sw_tag && (sw_tag & ~mask)) {
 622                 u32 v1 = sw_tag & ((1 << shift) - 1);
 623                 u32 v2 = (sw_tag >> (shift - 1)) << shift;
 624
 625                 return v2 | v1 | 1 << shift;
 626         }
 627
 628         return sw_tag | 1 << shift;
 629 }
 630
 631 static inline u32 cxgbi_ddp_tag_base(struct cxgbi_tag_format *tformat,
 632                                         u32 sw_tag)
 633 {
 634         u32 mask = (1 << tformat->rsvd_shift) - 1;
 635
 636         if (sw_tag && (sw_tag & ~mask)) {
 637                 u32 v1 = sw_tag & mask;
 638                 u32 v2 = sw_tag >> tformat->rsvd_shift;
 639
 640                 v2 <<= tformat->rsvd_bits + tformat->rsvd_shift;
 641
 642                 return v2 | v1;
 643         }
 644
 645         return sw_tag;
 646 }
 647
 648 static inline u32 cxgbi_tag_rsvd_bits(struct cxgbi_tag_format *tformat,
 649                                         u32 tag)
 650 {
 651         if (cxgbi_is_ddp_tag(tformat, tag))
 652                 return (tag >> tformat->rsvd_shift) & tformat->rsvd_mask;
 653
 654         return 0;
 655 }
 656
 657 static inline u32 cxgbi_tag_nonrsvd_bits(struct cxgbi_tag_format *tformat,
 658                                         u32 tag)
 659 {
 660         unsigned char shift = tformat->rsvd_bits + tformat->rsvd_shift - 1;
 661         u32 v1, v2;
 662
 663         if (cxgbi_is_ddp_tag(tformat, tag)) {
 664                 v1 = tag & ((1 << tformat->rsvd_shift) - 1);
 665                 v2 = (tag >> (shift + 1)) << tformat->rsvd_shift;
 666         } else {
 667                 u32 mask = (1 << shift) - 1;
 668                 tag &= ~(1 << shift);
 669                 v1 = tag & mask;
 670                 v2 = (tag >> 1) & ~mask;
 671         }
 672         return v1 | v2;
 673 }
 674
 675 static inline void *cxgbi_alloc_big_mem(unsigned int size,
 676                                         gfp_t gfp)
 677 {
 678         void *p = kzalloc(size, gfp | __GFP_NOWARN);
 679
 680         if (!p)
 681                 p = vzalloc(size);
 682
 683         return p;
 684 }
 685
 686 static inline void cxgbi_free_big_mem(void *addr)
 687 {
 688         if (is_vmalloc_addr(addr))
 689                 vfree(addr);
 690         else
 691                 kfree(addr);
 692 }
 693
 694 static inline void cxgbi_set_iscsi_ipv4(struct cxgbi_hba *chba, __be32 ipaddr)
 695 {
 696         if (chba->cdev->flags & CXGBI_FLAG_IPV4_SET)
 697                 chba->ipv4addr = ipaddr;
 698         else
 699                 pr_info("set iscsi ipv4 NOT supported, using %s ipv4.\n",
 700                         chba->ndev->name);
 701 }
 702
 703 struct cxgbi_device *cxgbi_device_register(unsigned int, unsigned int);
 704 void cxgbi_device_unregister(struct cxgbi_device *);
 705 void cxgbi_device_unregister_all(unsigned int flag);
 706 struct cxgbi_device *cxgbi_device_find_by_lldev(void *);
 707 struct cxgbi_device *cxgbi_device_find_by_netdev(struct net_device *, int *);
 708 struct cxgbi_device *cxgbi_device_find_by_netdev_rcu(struct net_device *,
 709                                                      int *);
 710 int cxgbi_hbas_add(struct cxgbi_device *, u64, unsigned int,
 711                         struct scsi_host_template *,
 712                         struct scsi_transport_template *);
 713 void cxgbi_hbas_remove(struct cxgbi_device *);
 714
 715 int cxgbi_device_portmap_create(struct cxgbi_device *cdev, unsigned int base,
 716                         unsigned int max_conn);
 717 void cxgbi_device_portmap_cleanup(struct cxgbi_device *cdev);
 718
 719 void cxgbi_conn_tx_open(struct cxgbi_sock *);
 720 void cxgbi_conn_pdu_ready(struct cxgbi_sock *);
 721 int cxgbi_conn_alloc_pdu(struct iscsi_task *, u8);
 722 int cxgbi_conn_init_pdu(struct iscsi_task *, unsigned int , unsigned int);
 723 int cxgbi_conn_xmit_pdu(struct iscsi_task *);
 724
 725 void cxgbi_cleanup_task(struct iscsi_task *task);
 726
 727 umode_t cxgbi_attr_is_visible(int param_type, int param);
 728 void cxgbi_get_conn_stats(struct iscsi_cls_conn *, struct iscsi_stats *);
 729 int cxgbi_set_conn_param(struct iscsi_cls_conn *,
 730                         enum iscsi_param, char *, int);
 731 int cxgbi_get_ep_param(struct iscsi_endpoint *ep, enum iscsi_param, char *);
 732 struct iscsi_cls_conn *cxgbi_create_conn(struct iscsi_cls_session *, u32);
 733 int cxgbi_bind_conn(struct iscsi_cls_session *,
 734                         struct iscsi_cls_conn *, u64, int);
 735 void cxgbi_destroy_session(struct iscsi_cls_session *);
 736 struct iscsi_cls_session *cxgbi_create_session(struct iscsi_endpoint *,
 737                         u16, u16, u32);
 738 int cxgbi_set_host_param(struct Scsi_Host *,
 739                         enum iscsi_host_param, char *, int);
 740 int cxgbi_get_host_param(struct Scsi_Host *, enum iscsi_host_param, char *);
 741 struct iscsi_endpoint *cxgbi_ep_connect(struct Scsi_Host *,
 742                         struct sockaddr *, int);
 743 int cxgbi_ep_poll(struct iscsi_endpoint *, int);
 744 void cxgbi_ep_disconnect(struct iscsi_endpoint *);
 745
 746 int cxgbi_iscsi_init(struct iscsi_transport *,
 747                         struct scsi_transport_template **);
 748 void cxgbi_iscsi_cleanup(struct iscsi_transport *,
 749                         struct scsi_transport_template **);
 750 void cxgbi_parse_pdu_itt(struct iscsi_conn *, itt_t, int *, int *);
 751 int cxgbi_ddp_init(struct cxgbi_device *, unsigned int, unsigned int,
 752                         unsigned int, unsigned int);
 753 int cxgbi_ddp_cleanup(struct cxgbi_device *);
 754 void cxgbi_ddp_page_size_factor(int *);
 755 void cxgbi_ddp_ppod_clear(struct cxgbi_pagepod *);
 756 void cxgbi_ddp_ppod_set(struct cxgbi_pagepod *, struct cxgbi_pagepod_hdr *,
 757                         struct cxgbi_gather_list *, unsigned int);
 758 #endif  /*__LIBCXGBI_H__*/