drivers/scsi/cxgb3i/cxgb3i_ddp.c

   1 /*
   2  * cxgb3i_ddp.c: Chelsio S3xx iSCSI DDP Manager.
   3  *
   4  * Copyright (c) 2008 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  */
  12
  13 #include <linux/skbuff.h>
  14 #include <linux/scatterlist.h>
  15
  16 /* from cxgb3 LLD */
  17 #include "common.h"
  18 #include "t3_cpl.h"
  19 #include "t3cdev.h"
  20 #include "cxgb3_ctl_defs.h"
  21 #include "cxgb3_offload.h"
  22 #include "firmware_exports.h"
  23
  24 #include "cxgb3i_ddp.h"
  25
  26 #define DRV_MODULE_NAME         "cxgb3i_ddp"
  27 #define DRV_MODULE_VERSION      "1.0.0"
  28 #define DRV_MODULE_RELDATE      "Dec. 1, 2008"
  29
  30 static char version[] =
  31         "Chelsio S3xx iSCSI DDP " DRV_MODULE_NAME
  32         " v" DRV_MODULE_VERSION " (" DRV_MODULE_RELDATE ")\n";
  33
  34 MODULE_AUTHOR("Karen Xie <kxie@chelsio.com>");
  35 MODULE_DESCRIPTION("cxgb3i ddp pagepod manager");
  36 MODULE_LICENSE("GPL");
  37 MODULE_VERSION(DRV_MODULE_VERSION);
  38
  39 #define ddp_log_error(fmt...) printk(KERN_ERR "cxgb3i_ddp: ERR! " fmt)
  40 #define ddp_log_warn(fmt...)  printk(KERN_WARNING "cxgb3i_ddp: WARN! " fmt)
  41 #define ddp_log_info(fmt...)  printk(KERN_INFO "cxgb3i_ddp: " fmt)
  42
  43 #ifdef __DEBUG_CXGB3I_DDP__
  44 #define ddp_log_debug(fmt, args...) \
  45         printk(KERN_INFO "cxgb3i_ddp: %s - " fmt, __func__ , ## args)
  46 #else
  47 #define ddp_log_debug(fmt...)
  48 #endif
  49
  50 /*
  51  * iSCSI Direct Data Placement
  52  *
  53  * T3 h/w can directly place the iSCSI Data-In or Data-Out PDU's payload into
  54  * pre-posted final destination host-memory buffers based on the Initiator
  55  * Task Tag (ITT) in Data-In or Target Task Tag (TTT) in Data-Out PDUs.
  56  *
  57  * The host memory address is programmed into h/w in the format of pagepod
  58  * entries.
  59  * The location of the pagepod entry is encoded into ddp tag which is used or
  60  * is the base for ITT/TTT.
  61  */
  62
  63 #define DDP_PGIDX_MAX           4
  64 #define DDP_THRESHOLD   2048
  65 static unsigned char ddp_page_order[DDP_PGIDX_MAX] = {0, 1, 2, 4};
  66 static unsigned char ddp_page_shift[DDP_PGIDX_MAX] = {12, 13, 14, 16};
  67 static unsigned char page_idx = DDP_PGIDX_MAX;
  68
  69 /*
  70  * functions to program the pagepod in h/w
  71  */
  72 static inline void ulp_mem_io_set_hdr(struct sk_buff *skb, unsigned int addr)
  73 {
  74         struct ulp_mem_io *req = (struct ulp_mem_io *)skb->head;
  75
  76         req->wr.wr_lo = 0;
  77         req->wr.wr_hi = htonl(V_WR_OP(FW_WROPCODE_BYPASS));
  78         req->cmd_lock_addr = htonl(V_ULP_MEMIO_ADDR(addr >> 5) |
  79                                    V_ULPTX_CMD(ULP_MEM_WRITE));
  80         req->len = htonl(V_ULP_MEMIO_DATA_LEN(PPOD_SIZE >> 5) |
  81                          V_ULPTX_NFLITS((PPOD_SIZE >> 3) + 1));
  82 }
  83
  84 static int set_ddp_map(struct cxgb3i_ddp_info *ddp, struct pagepod_hdr *hdr,
  85                        unsigned int idx, unsigned int npods,
  86                        struct cxgb3i_gather_list *gl)
  87 {
  88         unsigned int pm_addr = (idx << PPOD_SIZE_SHIFT) + ddp->llimit;
  89         int i;
  90
  91         for (i = 0; i < npods; i++, idx++, pm_addr += PPOD_SIZE) {
  92                 struct sk_buff *skb = ddp->gl_skb[idx];
  93                 struct pagepod *ppod;
  94                 int j, pidx;
  95
  96                 /* hold on to the skb until we clear the ddp mapping */
  97                 skb_get(skb);
  98
  99                 ulp_mem_io_set_hdr(skb, pm_addr);
 100                 ppod = (struct pagepod *)
 101                        (skb->head + sizeof(struct ulp_mem_io));
 102                 memcpy(&(ppod->hdr), hdr, sizeof(struct pagepod));
 103                 for (pidx = 4 * i, j = 0; j < 5; ++j, ++pidx)
 104                         ppod->addr[j] = pidx < gl->nelem ?
 105                                      cpu_to_be64(gl->phys_addr[pidx]) : 0UL;
 106
 107                 skb->priority = CPL_PRIORITY_CONTROL;
 108                 cxgb3_ofld_send(ddp->tdev, skb);
 109         }
 110         return 0;
 111 }
 112
 113 static void clear_ddp_map(struct cxgb3i_ddp_info *ddp, unsigned int tag,
 114                          unsigned int idx, unsigned int npods)
 115 {
 116         unsigned int pm_addr = (idx << PPOD_SIZE_SHIFT) + ddp->llimit;
 117         int i;
 118
 119         for (i = 0; i < npods; i++, idx++, pm_addr += PPOD_SIZE) {
 120                 struct sk_buff *skb = ddp->gl_skb[idx];
 121
 122                 if (!skb) {
 123                         ddp_log_error("ddp tag 0x%x, 0x%x, %d/%u, skb NULL.\n",
 124                                         tag, idx, i, npods);
 125                         continue;
 126                 }
 127                 ddp->gl_skb[idx] = NULL;
 128                 memset((skb->head + sizeof(struct ulp_mem_io)), 0, PPOD_SIZE);
 129                 ulp_mem_io_set_hdr(skb, pm_addr);
 130                 skb->priority = CPL_PRIORITY_CONTROL;
 131                 cxgb3_ofld_send(ddp->tdev, skb);
 132         }
 133 }
 134
 135 static inline int ddp_find_unused_entries(struct cxgb3i_ddp_info *ddp,
 136                                           int start, int max, int count,
 137                                           struct cxgb3i_gather_list *gl)
 138 {
 139         unsigned int i, j;
 140
 141         spin_lock(&ddp->map_lock);
 142         for (i = start; i <= max;) {
 143                 for (j = 0; j < count; j++) {
 144                         if (ddp->gl_map[i + j])
 145                                 break;
 146                 }
 147                 if (j == count) {
 148                         for (j = 0; j < count; j++)
 149                                 ddp->gl_map[i + j] = gl;
 150                         spin_unlock(&ddp->map_lock);
 151                         return i;
 152                 }
 153                 i += j + 1;
 154         }
 155         spin_unlock(&ddp->map_lock);
 156         return -EBUSY;
 157 }
 158
 159 static inline void ddp_unmark_entries(struct cxgb3i_ddp_info *ddp,
 160                                       int start, int count)
 161 {
 162         spin_lock(&ddp->map_lock);
 163         memset(&ddp->gl_map[start], 0,
 164                count * sizeof(struct cxgb3i_gather_list *));
 165         spin_unlock(&ddp->map_lock);
 166 }
 167
 168 static inline void ddp_free_gl_skb(struct cxgb3i_ddp_info *ddp,
 169                                    int idx, int count)
 170 {
 171         int i;
 172
 173         for (i = 0; i < count; i++, idx++)
 174                 if (ddp->gl_skb[idx]) {
 175                         kfree_skb(ddp->gl_skb[idx]);
 176                         ddp->gl_skb[idx] = NULL;
 177                 }
 178 }
 179
 180 static inline int ddp_alloc_gl_skb(struct cxgb3i_ddp_info *ddp, int idx,
 181                                    int count, gfp_t gfp)
 182 {
 183         int i;
 184
 185         for (i = 0; i < count; i++) {
 186                 struct sk_buff *skb = alloc_skb(sizeof(struct ulp_mem_io) +
 187                                                 PPOD_SIZE, gfp);
 188                 if (skb) {
 189                         ddp->gl_skb[idx + i] = skb;
 190                         skb_put(skb, sizeof(struct ulp_mem_io) + PPOD_SIZE);
 191                 } else {
 192                         ddp_free_gl_skb(ddp, idx, i);
 193                         return -ENOMEM;
 194                 }
 195         }
 196         return 0;
 197 }
 198
 199 /**
 200  * cxgb3i_ddp_find_page_index - return ddp page index for a given page size
 201  * @pgsz: page size
 202  * return the ddp page index, if no match is found return DDP_PGIDX_MAX.
 203  */
 204 int cxgb3i_ddp_find_page_index(unsigned long pgsz)
 205 {
 206         int i;
 207
 208         for (i = 0; i < DDP_PGIDX_MAX; i++) {
 209                 if (pgsz == (1UL << ddp_page_shift[i]))
 210                         return i;
 211         }
 212         ddp_log_debug("ddp page size 0x%lx not supported.\n", pgsz);
 213         return DDP_PGIDX_MAX;
 214 }
 215 EXPORT_SYMBOL_GPL(cxgb3i_ddp_find_page_index);
 216
 217 static inline void ddp_gl_unmap(struct pci_dev *pdev,
 218                                 struct cxgb3i_gather_list *gl)
 219 {
 220         int i;
 221
 222         for (i = 0; i < gl->nelem; i++)
 223                 pci_unmap_page(pdev, gl->phys_addr[i], PAGE_SIZE,
 224                                PCI_DMA_FROMDEVICE);
 225 }
 226
 227 static inline int ddp_gl_map(struct pci_dev *pdev,
 228                              struct cxgb3i_gather_list *gl)
 229 {
 230         int i;
 231
 232         for (i = 0; i < gl->nelem; i++) {
 233                 gl->phys_addr[i] = pci_map_page(pdev, gl->pages[i], 0,
 234                                                 PAGE_SIZE,
 235                                                 PCI_DMA_FROMDEVICE);
 236                 if (unlikely(pci_dma_mapping_error(pdev, gl->phys_addr[i])))
 237                         goto unmap;
 238         }
 239
 240         return i;
 241
 242 unmap:
 243         if (i) {
 244                 unsigned int nelem = gl->nelem;
 245
 246                 gl->nelem = i;
 247                 ddp_gl_unmap(pdev, gl);
 248                 gl->nelem = nelem;
 249         }
 250         return -ENOMEM;
 251 }
 252
 253 /**
 254  * cxgb3i_ddp_make_gl - build ddp page buffer list
 255  * @xferlen: total buffer length
 256  * @sgl: page buffer scatter-gather list
 257  * @sgcnt: # of page buffers
 258  * @pdev: pci_dev, used for pci map
 259  * @gfp: allocation mode
 260  *
 261  * construct a ddp page buffer list from the scsi scattergather list.
 262  * coalesce buffers as much as possible, and obtain dma addresses for
 263  * each page.
 264  *
 265  * Return the cxgb3i_gather_list constructed from the page buffers if the
 266  * memory can be used for ddp. Return NULL otherwise.
 267  */
 268 struct cxgb3i_gather_list *cxgb3i_ddp_make_gl(unsigned int xferlen,
 269                                               struct scatterlist *sgl,
 270                                               unsigned int sgcnt,
 271                                               struct pci_dev *pdev,
 272                                               gfp_t gfp)
 273 {
 274         struct cxgb3i_gather_list *gl;
 275         struct scatterlist *sg = sgl;
 276         struct page *sgpage = sg_page(sg);
 277         unsigned int sglen = sg->length;
 278         unsigned int sgoffset = sg->offset;
 279         unsigned int npages = (xferlen + sgoffset + PAGE_SIZE - 1) >>
 280                               PAGE_SHIFT;
 281         int i = 1, j = 0;
 282
 283         if (xferlen < DDP_THRESHOLD) {
 284                 ddp_log_debug("xfer %u < threshold %u, no ddp.\n",
 285                               xferlen, DDP_THRESHOLD);
 286                 return NULL;
 287         }
 288
 289         gl = kzalloc(sizeof(struct cxgb3i_gather_list) +
 290                      npages * (sizeof(dma_addr_t) + sizeof(struct page *)),
 291                      gfp);
 292         if (!gl)
 293                 return NULL;
 294
 295         gl->pages = (struct page **)&gl->phys_addr[npages];
 296         gl->length = xferlen;
 297         gl->offset = sgoffset;
 298         gl->pages[0] = sgpage;
 299
 300         sg = sg_next(sg);
 301         while (sg) {
 302                 struct page *page = sg_page(sg);
 303
 304                 if (sgpage == page && sg->offset == sgoffset + sglen)
 305                         sglen += sg->length;
 306                 else {
 307                         /* make sure the sgl is fit for ddp:
 308                          * each has the same page size, and
 309                          * all of the middle pages are used completely
 310                          */
 311                         if ((j && sgoffset) ||
 312                             ((i != sgcnt - 1) &&
 313                              ((sglen + sgoffset) & ~PAGE_MASK)))
 314                                 goto error_out;
 315
 316                         j++;
 317                         if (j == gl->nelem || sg->offset)
 318                                 goto error_out;
 319                         gl->pages[j] = page;
 320                         sglen = sg->length;
 321                         sgoffset = sg->offset;
 322                         sgpage = page;
 323                 }
 324                 i++;
 325                 sg = sg_next(sg);
 326         }
 327         gl->nelem = ++j;
 328
 329         if (ddp_gl_map(pdev, gl) < 0)
 330                 goto error_out;
 331
 332         return gl;
 333
 334 error_out:
 335         kfree(gl);
 336         return NULL;
 337 }
 338 EXPORT_SYMBOL_GPL(cxgb3i_ddp_make_gl);
 339
 340 /**
 341  * cxgb3i_ddp_release_gl - release a page buffer list
 342  * @gl: a ddp page buffer list
 343  * @pdev: pci_dev used for pci_unmap
 344  * free a ddp page buffer list resulted from cxgb3i_ddp_make_gl().
 345  */
 346 void cxgb3i_ddp_release_gl(struct cxgb3i_gather_list *gl,
 347                            struct pci_dev *pdev)
 348 {
 349         ddp_gl_unmap(pdev, gl);
 350         kfree(gl);
 351 }
 352 EXPORT_SYMBOL_GPL(cxgb3i_ddp_release_gl);
 353
 354 /**
 355  * cxgb3i_ddp_tag_reserve - set up ddp for a data transfer
 356  * @tdev: t3cdev adapter
 357  * @tid: connection id
 358  * @tformat: tag format
 359  * @tagp: contains s/w tag initially, will be updated with ddp/hw tag
 360  * @gl: the page momory list
 361  * @gfp: allocation mode
 362  *
 363  * ddp setup for a given page buffer list and construct the ddp tag.
 364  * return 0 if success, < 0 otherwise.
 365  */
 366 int cxgb3i_ddp_tag_reserve(struct t3cdev *tdev, unsigned int tid,
 367                            struct cxgb3i_tag_format *tformat, u32 *tagp,
 368                            struct cxgb3i_gather_list *gl, gfp_t gfp)
 369 {
 370         struct cxgb3i_ddp_info *ddp = tdev->ulp_iscsi;
 371         struct pagepod_hdr hdr;
 372         unsigned int npods;
 373         int idx = -1, idx_max;
 374         int err = -ENOMEM;
 375         u32 sw_tag = *tagp;
 376         u32 tag;
 377
 378         if (page_idx >= DDP_PGIDX_MAX || !ddp || !gl || !gl->nelem ||
 379                 gl->length < DDP_THRESHOLD) {
 380                 ddp_log_debug("pgidx %u, xfer %u/%u, NO ddp.\n",
 381                               page_idx, gl->length, DDP_THRESHOLD);
 382                 return -EINVAL;
 383         }
 384
 385         npods = (gl->nelem + PPOD_PAGES_MAX - 1) >> PPOD_PAGES_SHIFT;
 386         idx_max = ddp->nppods - npods + 1;
 387
 388         if (ddp->idx_last == ddp->nppods)
 389                 idx = ddp_find_unused_entries(ddp, 0, idx_max, npods, gl);
 390         else {
 391                 idx = ddp_find_unused_entries(ddp, ddp->idx_last + 1,
 392                                               idx_max, npods, gl);
 393                 if (idx < 0 && ddp->idx_last >= npods)
 394                         idx = ddp_find_unused_entries(ddp, 0,
 395                                                       ddp->idx_last - npods + 1,
 396                                                       npods, gl);
 397         }
 398         if (idx < 0) {
 399                 ddp_log_debug("xferlen %u, gl %u, npods %u NO DDP.\n",
 400                               gl->length, gl->nelem, npods);
 401                 return idx;
 402         }
 403
 404         err = ddp_alloc_gl_skb(ddp, idx, npods, gfp);
 405         if (err < 0)
 406                 goto unmark_entries;
 407
 408         tag = cxgb3i_ddp_tag_base(tformat, sw_tag);
 409         tag |= idx << PPOD_IDX_SHIFT;
 410
 411         hdr.rsvd = 0;
 412         hdr.vld_tid = htonl(F_PPOD_VALID | V_PPOD_TID(tid));
 413         hdr.pgsz_tag_clr = htonl(tag & ddp->rsvd_tag_mask);
 414         hdr.maxoffset = htonl(gl->length);
 415         hdr.pgoffset = htonl(gl->offset);
 416
 417         err = set_ddp_map(ddp, &hdr, idx, npods, gl);
 418         if (err < 0)
 419                 goto free_gl_skb;
 420
 421         ddp->idx_last = idx;
 422         ddp_log_debug("xfer %u, gl %u,%u, tid 0x%x, 0x%x -> 0x%x(%u,%u).\n",
 423                       gl->length, gl->nelem, gl->offset, tid, sw_tag, tag,
 424                       idx, npods);
 425         *tagp = tag;
 426         return 0;
 427
 428 free_gl_skb:
 429         ddp_free_gl_skb(ddp, idx, npods);
 430 unmark_entries:
 431         ddp_unmark_entries(ddp, idx, npods);
 432         return err;
 433 }
 434 EXPORT_SYMBOL_GPL(cxgb3i_ddp_tag_reserve);
 435
 436 /**
 437  * cxgb3i_ddp_tag_release - release a ddp tag
 438  * @tdev: t3cdev adapter
 439  * @tag: ddp tag
 440  * ddp cleanup for a given ddp tag and release all the resources held
 441  */
 442 void cxgb3i_ddp_tag_release(struct t3cdev *tdev, u32 tag)
 443 {
 444         struct cxgb3i_ddp_info *ddp = tdev->ulp_iscsi;
 445         u32 idx;
 446
 447         if (!ddp) {
 448                 ddp_log_error("release ddp tag 0x%x, ddp NULL.\n", tag);
 449                 return;
 450         }
 451
 452         idx = (tag >> PPOD_IDX_SHIFT) & ddp->idx_mask;
 453         if (idx < ddp->nppods) {
 454                 struct cxgb3i_gather_list *gl = ddp->gl_map[idx];
 455                 unsigned int npods;
 456
 457                 if (!gl || !gl->nelem) {
 458                         ddp_log_error("release 0x%x, idx 0x%x, gl 0x%p, %u.\n",
 459                                       tag, idx, gl, gl ? gl->nelem : 0);
 460                         return;
 461                 }
 462                 npods = (gl->nelem + PPOD_PAGES_MAX - 1) >> PPOD_PAGES_SHIFT;
 463                 ddp_log_debug("ddp tag 0x%x, release idx 0x%x, npods %u.\n",
 464                               tag, idx, npods);
 465                 clear_ddp_map(ddp, tag, idx, npods);
 466                 ddp_unmark_entries(ddp, idx, npods);
 467                 cxgb3i_ddp_release_gl(gl, ddp->pdev);
 468         } else
 469                 ddp_log_error("ddp tag 0x%x, idx 0x%x > max 0x%x.\n",
 470                               tag, idx, ddp->nppods);
 471 }
 472 EXPORT_SYMBOL_GPL(cxgb3i_ddp_tag_release);
 473
 474 static int setup_conn_pgidx(struct t3cdev *tdev, unsigned int tid, int pg_idx,
 475                             int reply)
 476 {
 477         struct sk_buff *skb = alloc_skb(sizeof(struct cpl_set_tcb_field),
 478                                         GFP_KERNEL);
 479         struct cpl_set_tcb_field *req;
 480         u64 val = pg_idx < DDP_PGIDX_MAX ? pg_idx : 0;
 481
 482         if (!skb)
 483                 return -ENOMEM;
 484
 485         /* set up ulp submode and page size */
 486         req = (struct cpl_set_tcb_field *)skb_put(skb, sizeof(*req));
 487         req->wr.wr_hi = htonl(V_WR_OP(FW_WROPCODE_FORWARD));
 488         OPCODE_TID(req) = htonl(MK_OPCODE_TID(CPL_SET_TCB_FIELD, tid));
 489         req->reply = V_NO_REPLY(reply ? 0 : 1);
 490         req->cpu_idx = 0;
 491         req->word = htons(31);
 492         req->mask = cpu_to_be64(0xF0000000);
 493         req->val = cpu_to_be64(val << 28);
 494         skb->priority = CPL_PRIORITY_CONTROL;
 495
 496         cxgb3_ofld_send(tdev, skb);
 497         return 0;
 498 }
 499
 500 /**
 501  * cxgb3i_setup_conn_host_pagesize - setup the conn.'s ddp page size
 502  * @tdev: t3cdev adapter
 503  * @tid: connection id
 504  * @reply: request reply from h/w
 505  * set up the ddp page size based on the host PAGE_SIZE for a connection
 506  * identified by tid
 507  */
 508 int cxgb3i_setup_conn_host_pagesize(struct t3cdev *tdev, unsigned int tid,
 509                                     int reply)
 510 {
 511         return setup_conn_pgidx(tdev, tid, page_idx, reply);
 512 }
 513 EXPORT_SYMBOL_GPL(cxgb3i_setup_conn_host_pagesize);
 514
 515 /**
 516  * cxgb3i_setup_conn_pagesize - setup the conn.'s ddp page size
 517  * @tdev: t3cdev adapter
 518  * @tid: connection id
 519  * @reply: request reply from h/w
 520  * @pgsz: ddp page size
 521  * set up the ddp page size for a connection identified by tid
 522  */
 523 int cxgb3i_setup_conn_pagesize(struct t3cdev *tdev, unsigned int tid,
 524                                 int reply, unsigned long pgsz)
 525 {
 526         int pgidx = cxgb3i_ddp_find_page_index(pgsz);
 527
 528         return setup_conn_pgidx(tdev, tid, pgidx, reply);
 529 }
 530 EXPORT_SYMBOL_GPL(cxgb3i_setup_conn_pagesize);
 531
 532 /**
 533  * cxgb3i_setup_conn_digest - setup conn. digest setting
 534  * @tdev: t3cdev adapter
 535  * @tid: connection id
 536  * @hcrc: header digest enabled
 537  * @dcrc: data digest enabled
 538  * @reply: request reply from h/w
 539  * set up the iscsi digest settings for a connection identified by tid
 540  */
 541 int cxgb3i_setup_conn_digest(struct t3cdev *tdev, unsigned int tid,
 542                              int hcrc, int dcrc, int reply)
 543 {
 544         struct sk_buff *skb = alloc_skb(sizeof(struct cpl_set_tcb_field),
 545                                         GFP_KERNEL);
 546         struct cpl_set_tcb_field *req;
 547         u64 val = (hcrc ? 1 : 0) | (dcrc ? 2 : 0);
 548
 549         if (!skb)
 550                 return -ENOMEM;
 551
 552         /* set up ulp submode and page size */
 553         req = (struct cpl_set_tcb_field *)skb_put(skb, sizeof(*req));
 554         req->wr.wr_hi = htonl(V_WR_OP(FW_WROPCODE_FORWARD));
 555         OPCODE_TID(req) = htonl(MK_OPCODE_TID(CPL_SET_TCB_FIELD, tid));
 556         req->reply = V_NO_REPLY(reply ? 0 : 1);
 557         req->cpu_idx = 0;
 558         req->word = htons(31);
 559         req->mask = cpu_to_be64(0x0F000000);
 560         req->val = cpu_to_be64(val << 24);
 561         skb->priority = CPL_PRIORITY_CONTROL;
 562
 563         cxgb3_ofld_send(tdev, skb);
 564         return 0;
 565 }
 566 EXPORT_SYMBOL_GPL(cxgb3i_setup_conn_digest);
 567
 568
 569 /**
 570  * cxgb3i_adapter_ddp_info - read the adapter's ddp information
 571  * @tdev: t3cdev adapter
 572  * @tformat: tag format
 573  * @txsz: max tx pdu payload size, filled in by this func.
 574  * @rxsz: max rx pdu payload size, filled in by this func.
 575  * setup the tag format for a given iscsi entity
 576  */
 577 int cxgb3i_adapter_ddp_info(struct t3cdev *tdev,
 578                             struct cxgb3i_tag_format *tformat,
 579                             unsigned int *txsz, unsigned int *rxsz)
 580 {
 581         struct cxgb3i_ddp_info *ddp;
 582         unsigned char idx_bits;
 583
 584         if (!tformat)
 585                 return -EINVAL;
 586
 587         if (!tdev->ulp_iscsi)
 588                 return -EINVAL;
 589
 590         ddp = (struct cxgb3i_ddp_info *)tdev->ulp_iscsi;
 591
 592         idx_bits = 32 - tformat->sw_bits;
 593         tformat->rsvd_bits = ddp->idx_bits;
 594         tformat->rsvd_shift = PPOD_IDX_SHIFT;
 595         tformat->rsvd_mask = (1 << tformat->rsvd_bits) - 1;
 596
 597         ddp_log_info("tag format: sw %u, rsvd %u,%u, mask 0x%x.\n",
 598                       tformat->sw_bits, tformat->rsvd_bits,
 599                       tformat->rsvd_shift, tformat->rsvd_mask);
 600
 601         *txsz = min_t(unsigned int, ULP2_MAX_PDU_PAYLOAD,
 602                         ddp->max_txsz - ISCSI_PDU_NONPAYLOAD_LEN);
 603         *rxsz = min_t(unsigned int, ULP2_MAX_PDU_PAYLOAD,
 604                         ddp->max_rxsz - ISCSI_PDU_NONPAYLOAD_LEN);
 605         ddp_log_info("max payload size: %u/%u, %u/%u.\n",
 606                      *txsz, ddp->max_txsz, *rxsz, ddp->max_rxsz);
 607         return 0;
 608 }
 609 EXPORT_SYMBOL_GPL(cxgb3i_adapter_ddp_info);
 610
 611 /**
 612  * ddp_release - release the cxgb3 adapter's ddp resource
 613  * @tdev: t3cdev adapter
 614  * release all the resource held by the ddp pagepod manager for a given
 615  * adapter if needed
 616  */
 617 static void ddp_release(struct t3cdev *tdev)
 618 {
 619         int i = 0;
 620         struct cxgb3i_ddp_info *ddp = (struct cxgb3i_ddp_info *)tdev->ulp_iscsi;
 621
 622         ddp_log_info("t3dev 0x%p, release ddp 0x%p.\n", tdev, ddp);
 623
 624         if (ddp) {
 625                 tdev->ulp_iscsi = NULL;
 626                 while (i < ddp->nppods) {
 627                         struct cxgb3i_gather_list *gl = ddp->gl_map[i];
 628                         if (gl) {
 629                                 int npods = (gl->nelem + PPOD_PAGES_MAX - 1)
 630                                                 >> PPOD_PAGES_SHIFT;
 631                                 ddp_log_info("t3dev 0x%p, ddp %d + %d.\n",
 632                                                 tdev, i, npods);
 633                                 kfree(gl);
 634                                 ddp_free_gl_skb(ddp, i, npods);
 635                                 i += npods;
 636                         } else
 637                                 i++;
 638                 }
 639                 cxgb3i_free_big_mem(ddp);
 640         }
 641 }
 642
 643 /**
 644  * ddp_init - initialize the cxgb3 adapter's ddp resource
 645  * @tdev: t3cdev adapter
 646  * initialize the ddp pagepod manager for a given adapter
 647  */
 648 static void ddp_init(struct t3cdev *tdev)
 649 {
 650         struct cxgb3i_ddp_info *ddp;
 651         struct ulp_iscsi_info uinfo;
 652         unsigned int ppmax, bits;
 653         int i, err;
 654         static int vers_printed;
 655
 656         if (tdev->ulp_iscsi) {
 657                 ddp_log_warn("t3dev 0x%p, ddp 0x%p already set up.\n",
 658                                 tdev, tdev->ulp_iscsi);
 659                 return;
 660         }
 661
 662         if (!vers_printed) {
 663                 printk(KERN_INFO "%s", version);
 664                 vers_printed = 1;
 665         }
 666
 667         err = tdev->ctl(tdev, ULP_ISCSI_GET_PARAMS, &uinfo);
 668         if (err < 0) {
 669                 ddp_log_error("%s, failed to get iscsi param err=%d.\n",
 670                                  tdev->name, err);
 671                 return;
 672         }
 673
 674         ppmax = (uinfo.ulimit - uinfo.llimit + 1) >> PPOD_SIZE_SHIFT;
 675         bits = __ilog2_u32(ppmax) + 1;
 676         if (bits > PPOD_IDX_MAX_SIZE)
 677                 bits = PPOD_IDX_MAX_SIZE;
 678         ppmax = (1 << (bits - 1)) - 1;
 679
 680         ddp = cxgb3i_alloc_big_mem(sizeof(struct cxgb3i_ddp_info) +
 681                                    ppmax *
 682                                         (sizeof(struct cxgb3i_gather_list *) +
 683                                         sizeof(struct sk_buff *)),
 684                                    GFP_KERNEL);
 685         if (!ddp) {
 686                 ddp_log_warn("%s unable to alloc ddp 0x%d, ddp disabled.\n",
 687                              tdev->name, ppmax);
 688                 return;
 689         }
 690         ddp->gl_map = (struct cxgb3i_gather_list **)(ddp + 1);
 691         ddp->gl_skb = (struct sk_buff **)(((char *)ddp->gl_map) +
 692                                           ppmax *
 693                                           sizeof(struct cxgb3i_gather_list *));
 694         spin_lock_init(&ddp->map_lock);
 695
 696         ddp->tdev = tdev;
 697         ddp->pdev = uinfo.pdev;
 698         ddp->max_txsz = min_t(unsigned int, uinfo.max_txsz, ULP2_MAX_PKT_SIZE);
 699         ddp->max_rxsz = min_t(unsigned int, uinfo.max_rxsz, ULP2_MAX_PKT_SIZE);
 700         ddp->llimit = uinfo.llimit;
 701         ddp->ulimit = uinfo.ulimit;
 702         ddp->nppods = ppmax;
 703         ddp->idx_last = ppmax;
 704         ddp->idx_bits = bits;
 705         ddp->idx_mask = (1 << bits) - 1;
 706         ddp->rsvd_tag_mask = (1 << (bits + PPOD_IDX_SHIFT)) - 1;
 707
 708         uinfo.tagmask = ddp->idx_mask << PPOD_IDX_SHIFT;
 709         for (i = 0; i < DDP_PGIDX_MAX; i++)
 710                 uinfo.pgsz_factor[i] = ddp_page_order[i];
 711         uinfo.ulimit = uinfo.llimit + (ppmax << PPOD_SIZE_SHIFT);
 712
 713         err = tdev->ctl(tdev, ULP_ISCSI_SET_PARAMS, &uinfo);
 714         if (err < 0) {
 715                 ddp_log_warn("%s unable to set iscsi param err=%d, "
 716                               "ddp disabled.\n", tdev->name, err);
 717                 goto free_ddp_map;
 718         }
 719
 720         tdev->ulp_iscsi = ddp;
 721
 722         ddp_log_info("tdev 0x%p, nppods %u, bits %u, mask 0x%x,0x%x pkt %u/%u,"
 723                         " %u/%u.\n",
 724                         tdev, ppmax, ddp->idx_bits, ddp->idx_mask,
 725                         ddp->rsvd_tag_mask, ddp->max_txsz, uinfo.max_txsz,
 726                         ddp->max_rxsz, uinfo.max_rxsz);
 727         return;
 728
 729 free_ddp_map:
 730         cxgb3i_free_big_mem(ddp);
 731 }
 732
 733 static struct cxgb3_client t3c_ddp_client = {
 734         .name = "iscsiddp_cxgb3",
 735         .add = ddp_init,
 736         .remove = ddp_release,
 737 };
 738
 739 /**
 740  * cxgb3i_ddp_init_module - module init entry point
 741  * initialize any driver wide global data structures and register with the
 742  * cxgb3 module
 743  */
 744 static int __init cxgb3i_ddp_init_module(void)
 745 {
 746         page_idx = cxgb3i_ddp_find_page_index(PAGE_SIZE);
 747         ddp_log_info("system PAGE_SIZE %lu, ddp idx %u.\n",
 748                      PAGE_SIZE, page_idx);
 749
 750         cxgb3_register_client(&t3c_ddp_client);
 751         return 0;
 752 }
 753
 754 /**
 755  * cxgb3i_ddp_exit_module - module cleanup/exit entry point
 756  * go through the ddp list, unregister with the cxgb3 module and release
 757  * any resource held.
 758  */
 759 static void __exit cxgb3i_ddp_exit_module(void)
 760 {
 761         cxgb3_unregister_client(&t3c_ddp_client);
 762 }
 763
 764 module_init(cxgb3i_ddp_init_module);
 765 module_exit(cxgb3i_ddp_exit_module);