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 /* max. connections per adapter */
  48 #define CXGBI_MAX_CONN          16384
  49
  50 /* always allocate rooms for AHS */
  51 #define SKB_TX_ISCSI_PDU_HEADER_MAX     \
  52         (sizeof(struct iscsi_hdr) + ISCSI_MAX_AHS_SIZE)
  53
  54 #define ISCSI_PDU_NONPAYLOAD_LEN        312 /* bhs(48) + ahs(256) + digest(8)*/
  55
  56 /*
  57  * align pdu size to multiple of 512 for better performance
  58  */
  59 #define cxgbi_align_pdu_size(n) do { n = (n) & (~511); } while (0)
  60
  61 #define ULP2_MODE_ISCSI         2
  62
  63 #define ULP2_MAX_PKT_SIZE       16224
  64 #define ULP2_MAX_PDU_PAYLOAD    \
  65         (ULP2_MAX_PKT_SIZE - ISCSI_PDU_NONPAYLOAD_LEN)
  66
  67 /*
  68  * For iscsi connections HW may inserts digest bytes into the pdu. Those digest
  69  * bytes are not sent by the host but are part of the TCP payload and therefore
  70  * consume TCP sequence space.
  71  */
  72 static const unsigned int ulp2_extra_len[] = { 0, 4, 4, 8 };
  73 static inline unsigned int cxgbi_ulp_extra_len(int submode)
  74 {
  75         return ulp2_extra_len[submode & 3];
  76 }
  77
  78 /*
  79  * struct pagepod_hdr, pagepod - pagepod format
  80  */
  81
  82 #define CPL_RX_DDP_STATUS_DDP_SHIFT     16 /* ddp'able */
  83 #define CPL_RX_DDP_STATUS_PAD_SHIFT     19 /* pad error */
  84 #define CPL_RX_DDP_STATUS_HCRC_SHIFT    20 /* hcrc error */
  85 #define CPL_RX_DDP_STATUS_DCRC_SHIFT    21 /* dcrc error */
  86
  87 struct cxgbi_pagepod_hdr {
  88         u32 vld_tid;
  89         u32 pgsz_tag_clr;
  90         u32 max_offset;
  91         u32 page_offset;
  92         u64 rsvd;
  93 };
  94
  95 #define PPOD_PAGES_MAX                  4
  96 struct cxgbi_pagepod {
  97         struct cxgbi_pagepod_hdr hdr;
  98         u64 addr[PPOD_PAGES_MAX + 1];
  99 };
 100
 101 struct cxgbi_tag_format {
 102         unsigned char sw_bits;
 103         unsigned char rsvd_bits;
 104         unsigned char rsvd_shift;
 105         unsigned char filler[1];
 106         u32 rsvd_mask;
 107 };
 108
 109 struct cxgbi_gather_list {
 110         unsigned int tag;
 111         unsigned int length;
 112         unsigned int offset;
 113         unsigned int nelem;
 114         struct page **pages;
 115         dma_addr_t phys_addr[0];
 116 };
 117
 118 struct cxgbi_ddp_info {
 119         struct kref refcnt;
 120         struct cxgbi_device *cdev;
 121         struct pci_dev *pdev;
 122         unsigned int max_txsz;
 123         unsigned int max_rxsz;
 124         unsigned int llimit;
 125         unsigned int ulimit;
 126         unsigned int nppods;
 127         unsigned int idx_last;
 128         unsigned char idx_bits;
 129         unsigned char filler[3];
 130         unsigned int idx_mask;
 131         unsigned int rsvd_tag_mask;
 132         spinlock_t map_lock;
 133         struct cxgbi_gather_list **gl_map;
 134         struct sk_buff **gl_skb;
 135 };
 136
 137 #define DDP_PGIDX_MAX           4
 138 #define DDP_THRESHOLD           2048
 139
 140 #define PPOD_PAGES_SHIFT        2       /*  4 pages per pod */
 141
 142 #define PPOD_SIZE               sizeof(struct cxgbi_pagepod)  /*  64 */
 143 #define PPOD_SIZE_SHIFT         6
 144
 145 #define ULPMEM_DSGL_MAX_NPPODS  16      /*  1024/PPOD_SIZE */
 146 #define ULPMEM_IDATA_MAX_NPPODS 4       /*  256/PPOD_SIZE */
 147 #define PCIE_MEMWIN_MAX_NPPODS  16      /*  1024/PPOD_SIZE */
 148
 149 #define PPOD_COLOR_SHIFT        0
 150 #define PPOD_COLOR(x)           ((x) << PPOD_COLOR_SHIFT)
 151
 152 #define PPOD_IDX_SHIFT          6
 153 #define PPOD_IDX_MAX_SIZE       24
 154
 155 #define PPOD_TID_SHIFT          0
 156 #define PPOD_TID(x)             ((x) << PPOD_TID_SHIFT)
 157
 158 #define PPOD_TAG_SHIFT          6
 159 #define PPOD_TAG(x)             ((x) << PPOD_TAG_SHIFT)
 160
 161 #define PPOD_VALID_SHIFT        24
 162 #define PPOD_VALID(x)           ((x) << PPOD_VALID_SHIFT)
 163 #define PPOD_VALID_FLAG         PPOD_VALID(1U)
 164
 165 /*
 166  * sge_opaque_hdr -
 167  * Opaque version of structure the SGE stores at skb->head of TX_DATA packets
 168  * and for which we must reserve space.
 169  */
 170 struct sge_opaque_hdr {
 171         void *dev;
 172         dma_addr_t addr[MAX_SKB_FRAGS + 1];
 173 };
 174
 175 struct cxgbi_sock {
 176         struct cxgbi_device *cdev;
 177
 178         int tid;
 179         int atid;
 180         unsigned long flags;
 181         unsigned int mtu;
 182         unsigned short rss_qid;
 183         unsigned short txq_idx;
 184         unsigned short advmss;
 185         unsigned int tx_chan;
 186         unsigned int rx_chan;
 187         unsigned int mss_idx;
 188         unsigned int smac_idx;
 189         unsigned char port_id;
 190         int wr_max_cred;
 191         int wr_cred;
 192         int wr_una_cred;
 193         unsigned char hcrc_len;
 194         unsigned char dcrc_len;
 195
 196         void *l2t;
 197         struct sk_buff *wr_pending_head;
 198         struct sk_buff *wr_pending_tail;
 199         struct sk_buff *cpl_close;
 200         struct sk_buff *cpl_abort_req;
 201         struct sk_buff *cpl_abort_rpl;
 202         struct sk_buff *skb_ulp_lhdr;
 203         spinlock_t lock;
 204         struct kref refcnt;
 205         unsigned int state;
 206         struct sockaddr_in saddr;
 207         struct sockaddr_in daddr;
 208         struct dst_entry *dst;
 209         struct sk_buff_head receive_queue;
 210         struct sk_buff_head write_queue;
 211         struct timer_list retry_timer;
 212         int err;
 213         rwlock_t callback_lock;
 214         void *user_data;
 215
 216         u32 rcv_nxt;
 217         u32 copied_seq;
 218         u32 rcv_wup;
 219         u32 snd_nxt;
 220         u32 snd_una;
 221         u32 write_seq;
 222 };
 223
 224 /*
 225  * connection states
 226  */
 227 enum cxgbi_sock_states{
 228         CTP_CLOSED,
 229         CTP_CONNECTING,
 230         CTP_ACTIVE_OPEN,
 231         CTP_ESTABLISHED,
 232         CTP_ACTIVE_CLOSE,
 233         CTP_PASSIVE_CLOSE,
 234         CTP_CLOSE_WAIT_1,
 235         CTP_CLOSE_WAIT_2,
 236         CTP_ABORTING,
 237 };
 238
 239 /*
 240  * Connection flags -- many to track some close related events.
 241  */
 242 enum cxgbi_sock_flags {
 243         CTPF_ABORT_RPL_RCVD,    /*received one ABORT_RPL_RSS message */
 244         CTPF_ABORT_REQ_RCVD,    /*received one ABORT_REQ_RSS message */
 245         CTPF_ABORT_RPL_PENDING, /* expecting an abort reply */
 246         CTPF_TX_DATA_SENT,      /* already sent a TX_DATA WR */
 247         CTPF_ACTIVE_CLOSE_NEEDED,/* need to be closed */
 248         CTPF_HAS_ATID,          /* reserved atid */
 249         CTPF_HAS_TID,           /* reserved hw tid */
 250         CTPF_OFFLOAD_DOWN,      /* offload function off */
 251 };
 252
 253 struct cxgbi_skb_rx_cb {
 254         __u32 ddigest;
 255         __u32 pdulen;
 256 };
 257
 258 struct cxgbi_skb_tx_cb {
 259         void *l2t;
 260         struct sk_buff *wr_next;
 261 };
 262
 263 enum cxgbi_skcb_flags {
 264         SKCBF_TX_NEED_HDR,      /* packet needs a header */
 265         SKCBF_RX_COALESCED,     /* received whole pdu */
 266         SKCBF_RX_HDR,           /* recieved pdu header */
 267         SKCBF_RX_DATA,          /* recieved pdu payload */
 268         SKCBF_RX_STATUS,        /* recieved ddp status */
 269         SKCBF_RX_DATA_DDPD,     /* pdu payload ddp'd */
 270         SKCBF_RX_HCRC_ERR,      /* header digest error */
 271         SKCBF_RX_DCRC_ERR,      /* data digest error */
 272         SKCBF_RX_PAD_ERR,       /* padding byte error */
 273 };
 274
 275 struct cxgbi_skb_cb {
 276         unsigned char ulp_mode;
 277         unsigned long flags;
 278         unsigned int seq;
 279         union {
 280                 struct cxgbi_skb_rx_cb rx;
 281                 struct cxgbi_skb_tx_cb tx;
 282         };
 283 };
 284
 285 #define CXGBI_SKB_CB(skb)       ((struct cxgbi_skb_cb *)&((skb)->cb[0]))
 286 #define cxgbi_skcb_flags(skb)           (CXGBI_SKB_CB(skb)->flags)
 287 #define cxgbi_skcb_ulp_mode(skb)        (CXGBI_SKB_CB(skb)->ulp_mode)
 288 #define cxgbi_skcb_tcp_seq(skb)         (CXGBI_SKB_CB(skb)->seq)
 289 #define cxgbi_skcb_rx_ddigest(skb)      (CXGBI_SKB_CB(skb)->rx.ddigest)
 290 #define cxgbi_skcb_rx_pdulen(skb)       (CXGBI_SKB_CB(skb)->rx.pdulen)
 291 #define cxgbi_skcb_tx_wr_next(skb)      (CXGBI_SKB_CB(skb)->tx.wr_next)
 292
 293 static inline void cxgbi_skcb_set_flag(struct sk_buff *skb,
 294                                         enum cxgbi_skcb_flags flag)
 295 {
 296         __set_bit(flag, &(cxgbi_skcb_flags(skb)));
 297 }
 298
 299 static inline void cxgbi_skcb_clear_flag(struct sk_buff *skb,
 300                                         enum cxgbi_skcb_flags flag)
 301 {
 302         __clear_bit(flag, &(cxgbi_skcb_flags(skb)));
 303 }
 304
 305 static inline int cxgbi_skcb_test_flag(struct sk_buff *skb,
 306                                         enum cxgbi_skcb_flags flag)
 307 {
 308         return test_bit(flag, &(cxgbi_skcb_flags(skb)));
 309 }
 310
 311 static inline void cxgbi_sock_set_flag(struct cxgbi_sock *csk,
 312                                         enum cxgbi_sock_flags flag)
 313 {
 314         __set_bit(flag, &csk->flags);
 315         log_debug(1 << CXGBI_DBG_SOCK,
 316                 "csk 0x%p,%u,0x%lx, bit %d.\n",
 317                 csk, csk->state, csk->flags, flag);
 318 }
 319
 320 static inline void cxgbi_sock_clear_flag(struct cxgbi_sock *csk,
 321                                         enum cxgbi_sock_flags flag)
 322 {
 323         __clear_bit(flag, &csk->flags);
 324         log_debug(1 << CXGBI_DBG_SOCK,
 325                 "csk 0x%p,%u,0x%lx, bit %d.\n",
 326                 csk, csk->state, csk->flags, flag);
 327 }
 328
 329 static inline int cxgbi_sock_flag(struct cxgbi_sock *csk,
 330                                 enum cxgbi_sock_flags flag)
 331 {
 332         if (csk == NULL)
 333                 return 0;
 334         return test_bit(flag, &csk->flags);
 335 }
 336
 337 static inline void cxgbi_sock_set_state(struct cxgbi_sock *csk, int state)
 338 {
 339         log_debug(1 << CXGBI_DBG_SOCK,
 340                 "csk 0x%p,%u,0x%lx, state -> %u.\n",
 341                 csk, csk->state, csk->flags, state);
 342         csk->state = state;
 343 }
 344
 345 static inline void cxgbi_sock_free(struct kref *kref)
 346 {
 347         struct cxgbi_sock *csk = container_of(kref,
 348                                                 struct cxgbi_sock,
 349                                                 refcnt);
 350         if (csk) {
 351                 log_debug(1 << CXGBI_DBG_SOCK,
 352                         "free csk 0x%p, state %u, flags 0x%lx\n",
 353                         csk, csk->state, csk->flags);
 354                 kfree(csk);
 355         }
 356 }
 357
 358 static inline void __cxgbi_sock_put(const char *fn, struct cxgbi_sock *csk)
 359 {
 360         log_debug(1 << CXGBI_DBG_SOCK,
 361                 "%s, put csk 0x%p, ref %u-1.\n",
 362                 fn, csk, atomic_read(&csk->refcnt.refcount));
 363         kref_put(&csk->refcnt, cxgbi_sock_free);
 364 }
 365 #define cxgbi_sock_put(csk)     __cxgbi_sock_put(__func__, csk)
 366
 367 static inline void __cxgbi_sock_get(const char *fn, struct cxgbi_sock *csk)
 368 {
 369         log_debug(1 << CXGBI_DBG_SOCK,
 370                 "%s, get csk 0x%p, ref %u+1.\n",
 371                 fn, csk, atomic_read(&csk->refcnt.refcount));
 372         kref_get(&csk->refcnt);
 373 }
 374 #define cxgbi_sock_get(csk)     __cxgbi_sock_get(__func__, csk)
 375
 376 static inline int cxgbi_sock_is_closing(struct cxgbi_sock *csk)
 377 {
 378         return csk->state >= CTP_ACTIVE_CLOSE;
 379 }
 380
 381 static inline int cxgbi_sock_is_established(struct cxgbi_sock *csk)
 382 {
 383         return csk->state == CTP_ESTABLISHED;
 384 }
 385
 386 static inline void cxgbi_sock_purge_write_queue(struct cxgbi_sock *csk)
 387 {
 388         struct sk_buff *skb;
 389
 390         while ((skb = __skb_dequeue(&csk->write_queue)))
 391                 __kfree_skb(skb);
 392 }
 393
 394 static inline unsigned int cxgbi_sock_compute_wscale(unsigned int win)
 395 {
 396         unsigned int wscale = 0;
 397
 398         while (wscale < 14 && (65535 << wscale) < win)
 399                 wscale++;
 400         return wscale;
 401 }
 402
 403 static inline struct sk_buff *alloc_wr(int wrlen, int dlen, gfp_t gfp)
 404 {
 405         struct sk_buff *skb = alloc_skb(wrlen + dlen, gfp);
 406
 407         if (skb) {
 408                 __skb_put(skb, wrlen);
 409                 memset(skb->head, 0, wrlen + dlen);
 410         } else
 411                 pr_info("alloc cpl wr skb %u+%u, OOM.\n", wrlen, dlen);
 412         return skb;
 413 }
 414
 415
 416 /*
 417  * The number of WRs needed for an skb depends on the number of fragments
 418  * in the skb and whether it has any payload in its main body.  This maps the
 419  * length of the gather list represented by an skb into the # of necessary WRs.
 420  * The extra two fragments are for iscsi bhs and payload padding.
 421  */
 422 #define SKB_WR_LIST_SIZE         (MAX_SKB_FRAGS + 2)
 423
 424 static inline void cxgbi_sock_reset_wr_list(struct cxgbi_sock *csk)
 425 {
 426         csk->wr_pending_head = csk->wr_pending_tail = NULL;
 427 }
 428
 429 static inline void cxgbi_sock_enqueue_wr(struct cxgbi_sock *csk,
 430                                           struct sk_buff *skb)
 431 {
 432         cxgbi_skcb_tx_wr_next(skb) = NULL;
 433         /*
 434          * We want to take an extra reference since both us and the driver
 435          * need to free the packet before it's really freed. We know there's
 436          * just one user currently so we use atomic_set rather than skb_get
 437          * to avoid the atomic op.
 438          */
 439         atomic_set(&skb->users, 2);
 440
 441         if (!csk->wr_pending_head)
 442                 csk->wr_pending_head = skb;
 443         else
 444                 cxgbi_skcb_tx_wr_next(csk->wr_pending_tail) = skb;
 445         csk->wr_pending_tail = skb;
 446 }
 447
 448 static inline int cxgbi_sock_count_pending_wrs(const struct cxgbi_sock *csk)
 449 {
 450         int n = 0;
 451         const struct sk_buff *skb = csk->wr_pending_head;
 452
 453         while (skb) {
 454                 n += skb->csum;
 455                 skb = cxgbi_skcb_tx_wr_next(skb);
 456         }
 457         return n;
 458 }
 459
 460 static inline struct sk_buff *cxgbi_sock_peek_wr(const struct cxgbi_sock *csk)
 461 {
 462         return csk->wr_pending_head;
 463 }
 464
 465 static inline struct sk_buff *cxgbi_sock_dequeue_wr(struct cxgbi_sock *csk)
 466 {
 467         struct sk_buff *skb = csk->wr_pending_head;
 468
 469         if (likely(skb)) {
 470                 csk->wr_pending_head = cxgbi_skcb_tx_wr_next(skb);
 471                 cxgbi_skcb_tx_wr_next(skb) = NULL;
 472         }
 473         return skb;
 474 }
 475
 476 void cxgbi_sock_check_wr_invariants(const struct cxgbi_sock *);
 477 void cxgbi_sock_purge_wr_queue(struct cxgbi_sock *);
 478 void cxgbi_sock_skb_entail(struct cxgbi_sock *, struct sk_buff *);
 479 void cxgbi_sock_fail_act_open(struct cxgbi_sock *, int);
 480 void cxgbi_sock_act_open_req_arp_failure(void *, struct sk_buff *);
 481 void cxgbi_sock_closed(struct cxgbi_sock *);
 482 void cxgbi_sock_established(struct cxgbi_sock *, unsigned int, unsigned int);
 483 void cxgbi_sock_rcv_abort_rpl(struct cxgbi_sock *);
 484 void cxgbi_sock_rcv_peer_close(struct cxgbi_sock *);
 485 void cxgbi_sock_rcv_close_conn_rpl(struct cxgbi_sock *, u32);
 486 void cxgbi_sock_rcv_wr_ack(struct cxgbi_sock *, unsigned int, unsigned int,
 487                                 int);
 488 unsigned int cxgbi_sock_select_mss(struct cxgbi_sock *, unsigned int);
 489 void cxgbi_sock_free_cpl_skbs(struct cxgbi_sock *);
 490
 491 struct cxgbi_hba {
 492         struct net_device *ndev;
 493         struct net_device *vdev;        /* vlan dev */
 494         struct Scsi_Host *shost;
 495         struct cxgbi_device *cdev;
 496         __be32 ipv4addr;
 497         unsigned char port_id;
 498 };
 499
 500 struct cxgbi_ports_map {
 501         unsigned int max_connect;
 502         unsigned int used;
 503         unsigned short sport_base;
 504         spinlock_t lock;
 505         unsigned int next;
 506         struct cxgbi_sock **port_csk;
 507 };
 508
 509 #define CXGBI_FLAG_DEV_T3               0x1
 510 #define CXGBI_FLAG_DEV_T4               0x2
 511 #define CXGBI_FLAG_ADAPTER_RESET        0x4
 512 #define CXGBI_FLAG_IPV4_SET             0x10
 513 struct cxgbi_device {
 514         struct list_head list_head;
 515         unsigned int flags;
 516         struct net_device **ports;
 517         void *lldev;
 518         struct cxgbi_hba **hbas;
 519         const unsigned short *mtus;
 520         unsigned char nmtus;
 521         unsigned char nports;
 522         struct pci_dev *pdev;
 523         struct dentry *debugfs_root;
 524         struct iscsi_transport *itp;
 525
 526         unsigned int pfvf;
 527         unsigned int snd_win;
 528         unsigned int rcv_win;
 529         unsigned int rx_credit_thres;
 530         unsigned int skb_tx_rsvd;
 531         unsigned int skb_rx_extra;      /* for msg coalesced mode */
 532         unsigned int tx_max_size;
 533         unsigned int rx_max_size;
 534         struct cxgbi_ports_map pmap;
 535         struct cxgbi_tag_format tag_format;
 536         struct cxgbi_ddp_info *ddp;
 537
 538         void (*dev_ddp_cleanup)(struct cxgbi_device *);
 539         void (*csk_ddp_free_gl_skb)(struct cxgbi_ddp_info *, int, int);
 540         int (*csk_ddp_alloc_gl_skb)(struct cxgbi_ddp_info *, int, int, gfp_t);
 541         int (*csk_ddp_set)(struct cxgbi_sock *, struct cxgbi_pagepod_hdr *,
 542                                 unsigned int, unsigned int,
 543                                 struct cxgbi_gather_list *);
 544         void (*csk_ddp_clear)(struct cxgbi_hba *,
 545                                 unsigned int, unsigned int, unsigned int);
 546         int (*csk_ddp_setup_digest)(struct cxgbi_sock *,
 547                                 unsigned int, int, int, int);
 548         int (*csk_ddp_setup_pgidx)(struct cxgbi_sock *,
 549                                 unsigned int, int, bool);
 550
 551         void (*csk_release_offload_resources)(struct cxgbi_sock *);
 552         int (*csk_rx_pdu_ready)(struct cxgbi_sock *, struct sk_buff *);
 553         u32 (*csk_send_rx_credits)(struct cxgbi_sock *, u32);
 554         int (*csk_push_tx_frames)(struct cxgbi_sock *, int);
 555         void (*csk_send_abort_req)(struct cxgbi_sock *);
 556         void (*csk_send_close_req)(struct cxgbi_sock *);
 557         int (*csk_alloc_cpls)(struct cxgbi_sock *);
 558         int (*csk_init_act_open)(struct cxgbi_sock *);
 559
 560         void *dd_data;
 561 };
 562 #define cxgbi_cdev_priv(cdev)   ((cdev)->dd_data)
 563
 564 struct cxgbi_conn {
 565         struct cxgbi_endpoint *cep;
 566         struct iscsi_conn *iconn;
 567         struct cxgbi_hba *chba;
 568         u32 task_idx_bits;
 569 };
 570
 571 struct cxgbi_endpoint {
 572         struct cxgbi_conn *cconn;
 573         struct cxgbi_hba *chba;
 574         struct cxgbi_sock *csk;
 575 };
 576
 577 #define MAX_PDU_FRAGS   ((ULP2_MAX_PDU_PAYLOAD + 512 - 1) / 512)
 578 struct cxgbi_task_data {
 579         unsigned short nr_frags;
 580         skb_frag_t frags[MAX_PDU_FRAGS];
 581         struct sk_buff *skb;
 582         unsigned int offset;
 583         unsigned int count;
 584         unsigned int sgoffset;
 585 };
 586 #define iscsi_task_cxgbi_data(task) \
 587         ((task)->dd_data + sizeof(struct iscsi_tcp_task))
 588
 589 static inline int cxgbi_is_ddp_tag(struct cxgbi_tag_format *tformat, u32 tag)
 590 {
 591         return !(tag & (1 << (tformat->rsvd_bits + tformat->rsvd_shift - 1)));
 592 }
 593
 594 static inline int cxgbi_sw_tag_usable(struct cxgbi_tag_format *tformat,
 595                                         u32 sw_tag)
 596 {
 597         sw_tag >>= (32 - tformat->rsvd_bits);
 598         return !sw_tag;
 599 }
 600
 601 static inline u32 cxgbi_set_non_ddp_tag(struct cxgbi_tag_format *tformat,
 602                                         u32 sw_tag)
 603 {
 604         unsigned char shift = tformat->rsvd_bits + tformat->rsvd_shift - 1;
 605         u32 mask = (1 << shift) - 1;
 606
 607         if (sw_tag && (sw_tag & ~mask)) {
 608                 u32 v1 = sw_tag & ((1 << shift) - 1);
 609                 u32 v2 = (sw_tag >> (shift - 1)) << shift;
 610
 611                 return v2 | v1 | 1 << shift;
 612         }
 613
 614         return sw_tag | 1 << shift;
 615 }
 616
 617 static inline u32 cxgbi_ddp_tag_base(struct cxgbi_tag_format *tformat,
 618                                         u32 sw_tag)
 619 {
 620         u32 mask = (1 << tformat->rsvd_shift) - 1;
 621
 622         if (sw_tag && (sw_tag & ~mask)) {
 623                 u32 v1 = sw_tag & mask;
 624                 u32 v2 = sw_tag >> tformat->rsvd_shift;
 625
 626                 v2 <<= tformat->rsvd_bits + tformat->rsvd_shift;
 627
 628                 return v2 | v1;
 629         }
 630
 631         return sw_tag;
 632 }
 633
 634 static inline u32 cxgbi_tag_rsvd_bits(struct cxgbi_tag_format *tformat,
 635                                         u32 tag)
 636 {
 637         if (cxgbi_is_ddp_tag(tformat, tag))
 638                 return (tag >> tformat->rsvd_shift) & tformat->rsvd_mask;
 639
 640         return 0;
 641 }
 642
 643 static inline u32 cxgbi_tag_nonrsvd_bits(struct cxgbi_tag_format *tformat,
 644                                         u32 tag)
 645 {
 646         unsigned char shift = tformat->rsvd_bits + tformat->rsvd_shift - 1;
 647         u32 v1, v2;
 648
 649         if (cxgbi_is_ddp_tag(tformat, tag)) {
 650                 v1 = tag & ((1 << tformat->rsvd_shift) - 1);
 651                 v2 = (tag >> (shift + 1)) << tformat->rsvd_shift;
 652         } else {
 653                 u32 mask = (1 << shift) - 1;
 654                 tag &= ~(1 << shift);
 655                 v1 = tag & mask;
 656                 v2 = (tag >> 1) & ~mask;
 657         }
 658         return v1 | v2;
 659 }
 660
 661 static inline void *cxgbi_alloc_big_mem(unsigned int size,
 662                                         gfp_t gfp)
 663 {
 664         void *p = kmalloc(size, gfp);
 665         if (!p)
 666                 p = vmalloc(size);
 667         if (p)
 668                 memset(p, 0, size);
 669         return p;
 670 }
 671
 672 static inline void cxgbi_free_big_mem(void *addr)
 673 {
 674         if (is_vmalloc_addr(addr))
 675                 vfree(addr);
 676         else
 677                 kfree(addr);
 678 }
 679
 680 static inline void cxgbi_set_iscsi_ipv4(struct cxgbi_hba *chba, __be32 ipaddr)
 681 {
 682         if (chba->cdev->flags & CXGBI_FLAG_IPV4_SET)
 683                 chba->ipv4addr = ipaddr;
 684         else
 685                 pr_info("set iscsi ipv4 NOT supported, using %s ipv4.\n",
 686                         chba->ndev->name);
 687 }
 688
 689 static inline __be32 cxgbi_get_iscsi_ipv4(struct cxgbi_hba *chba)
 690 {
 691         return chba->ipv4addr;
 692 }
 693
 694 struct cxgbi_device *cxgbi_device_register(unsigned int, unsigned int);
 695 void cxgbi_device_unregister(struct cxgbi_device *);
 696 void cxgbi_device_unregister_all(unsigned int flag);
 697 struct cxgbi_device *cxgbi_device_find_by_lldev(void *);
 698 int cxgbi_hbas_add(struct cxgbi_device *, unsigned int, unsigned int,
 699                         struct scsi_host_template *,
 700                         struct scsi_transport_template *);
 701 void cxgbi_hbas_remove(struct cxgbi_device *);
 702
 703 int cxgbi_device_portmap_create(struct cxgbi_device *cdev, unsigned int base,
 704                         unsigned int max_conn);
 705 void cxgbi_device_portmap_cleanup(struct cxgbi_device *cdev);
 706
 707 void cxgbi_conn_tx_open(struct cxgbi_sock *);
 708 void cxgbi_conn_pdu_ready(struct cxgbi_sock *);
 709 int cxgbi_conn_alloc_pdu(struct iscsi_task *, u8);
 710 int cxgbi_conn_init_pdu(struct iscsi_task *, unsigned int , unsigned int);
 711 int cxgbi_conn_xmit_pdu(struct iscsi_task *);
 712
 713 void cxgbi_cleanup_task(struct iscsi_task *task);
 714
 715 void cxgbi_get_conn_stats(struct iscsi_cls_conn *, struct iscsi_stats *);
 716 int cxgbi_set_conn_param(struct iscsi_cls_conn *,
 717                         enum iscsi_param, char *, int);
 718 int cxgbi_get_conn_param(struct iscsi_cls_conn *, enum iscsi_param, char *);
 719 struct iscsi_cls_conn *cxgbi_create_conn(struct iscsi_cls_session *, u32);
 720 int cxgbi_bind_conn(struct iscsi_cls_session *,
 721                         struct iscsi_cls_conn *, u64, int);
 722 void cxgbi_destroy_session(struct iscsi_cls_session *);
 723 struct iscsi_cls_session *cxgbi_create_session(struct iscsi_endpoint *,
 724                         u16, u16, u32);
 725 int cxgbi_set_host_param(struct Scsi_Host *,
 726                         enum iscsi_host_param, char *, int);
 727 int cxgbi_get_host_param(struct Scsi_Host *, enum iscsi_host_param, char *);
 728 struct iscsi_endpoint *cxgbi_ep_connect(struct Scsi_Host *,
 729                         struct sockaddr *, int);
 730 int cxgbi_ep_poll(struct iscsi_endpoint *, int);
 731 void cxgbi_ep_disconnect(struct iscsi_endpoint *);
 732
 733 int cxgbi_iscsi_init(struct iscsi_transport *,
 734                         struct scsi_transport_template **);
 735 void cxgbi_iscsi_cleanup(struct iscsi_transport *,
 736                         struct scsi_transport_template **);
 737 void cxgbi_parse_pdu_itt(struct iscsi_conn *, itt_t, int *, int *);
 738 int cxgbi_ddp_init(struct cxgbi_device *, unsigned int, unsigned int,
 739                         unsigned int, unsigned int);
 740 int cxgbi_ddp_cleanup(struct cxgbi_device *);
 741 void cxgbi_ddp_page_size_factor(int *);
 742 void cxgbi_ddp_ppod_clear(struct cxgbi_pagepod *);
 743 void cxgbi_ddp_ppod_set(struct cxgbi_pagepod *, struct cxgbi_pagepod_hdr *,
 744                         struct cxgbi_gather_list *, unsigned int);
 745 #endif  /*__LIBCXGBI_H__*/