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 static LIST_HEAD(cxgb3i_ddp_list);
  70 static DEFINE_RWLOCK(cxgb3i_ddp_rwlock);
  71
  72 /*
  73  * functions to program the pagepod in h/w
  74  */
  75 static inline void ulp_mem_io_set_hdr(struct sk_buff *skb, unsigned int addr)
  76 {
  77         struct ulp_mem_io *req = (struct ulp_mem_io *)skb->head;
  78
  79         req->wr.wr_lo = 0;
  80         req->wr.wr_hi = htonl(V_WR_OP(FW_WROPCODE_BYPASS));
  81         req->cmd_lock_addr = htonl(V_ULP_MEMIO_ADDR(addr >> 5) |
  82                                    V_ULPTX_CMD(ULP_MEM_WRITE));
  83         req->len = htonl(V_ULP_MEMIO_DATA_LEN(PPOD_SIZE >> 5) |
  84                          V_ULPTX_NFLITS((PPOD_SIZE >> 3) + 1));
  85 }
  86
  87 static int set_ddp_map(struct cxgb3i_ddp_info *ddp, struct pagepod_hdr *hdr,
  88                        unsigned int idx, unsigned int npods,
  89                        struct cxgb3i_gather_list *gl)
  90 {
  91         unsigned int pm_addr = (idx << PPOD_SIZE_SHIFT) + ddp->llimit;
  92         int i;
  93
  94         for (i = 0; i < npods; i++, idx++, pm_addr += PPOD_SIZE) {
  95                 struct sk_buff *skb = ddp->gl_skb[idx];
  96                 struct pagepod *ppod;
  97                 int j, pidx;
  98
  99                 /* hold on to the skb until we clear the ddp mapping */
 100                 skb_get(skb);
 101
 102                 ulp_mem_io_set_hdr(skb, pm_addr);
 103                 ppod = (struct pagepod *)
 104                        (skb->head + sizeof(struct ulp_mem_io));
 105                 memcpy(&(ppod->hdr), hdr, sizeof(struct pagepod));
 106                 for (pidx = 4 * i, j = 0; j < 5; ++j, ++pidx)
 107                         ppod->addr[j] = pidx < gl->nelem ?
 108                                      cpu_to_be64(gl->phys_addr[pidx]) : 0UL;
 109
 110                 skb->priority = CPL_PRIORITY_CONTROL;
 111                 cxgb3_ofld_send(ddp->tdev, skb);
 112         }
 113         return 0;
 114 }
 115
 116 static int clear_ddp_map(struct cxgb3i_ddp_info *ddp, unsigned int idx,
 117                          unsigned int npods)
 118 {
 119         unsigned int pm_addr = (idx << PPOD_SIZE_SHIFT) + ddp->llimit;
 120         int i;
 121
 122         for (i = 0; i < npods; i++, idx++, pm_addr += PPOD_SIZE) {
 123                 struct sk_buff *skb = ddp->gl_skb[idx];
 124
 125                 ddp->gl_skb[idx] = NULL;
 126                 memset((skb->head + sizeof(struct ulp_mem_io)), 0, PPOD_SIZE);
 127                 ulp_mem_io_set_hdr(skb, pm_addr);
 128                 skb->priority = CPL_PRIORITY_CONTROL;
 129                 cxgb3_ofld_send(ddp->tdev, skb);
 130         }
 131         return 0;
 132 }
 133
 134 static inline int ddp_find_unused_entries(struct cxgb3i_ddp_info *ddp,
 135                                           int start, int max, int count,
 136                                           struct cxgb3i_gather_list *gl)
 137 {
 138         unsigned int i, j;
 139
 140         spin_lock(&ddp->map_lock);
 141         for (i = start; i <= max;) {
 142                 for (j = 0; j < count; j++) {
 143                         if (ddp->gl_map[i + j])
 144                                 break;
 145                 }
 146                 if (j == count) {
 147                         for (j = 0; j < count; j++)
 148                                 ddp->gl_map[i + j] = gl;
 149                         spin_unlock(&ddp->map_lock);
 150                         return i;
 151                 }
 152                 i += j + 1;
 153         }
 154         spin_unlock(&ddp->map_lock);
 155         return -EBUSY;
 156 }
 157
 158 static inline void ddp_unmark_entries(struct cxgb3i_ddp_info *ddp,
 159                                       int start, int count)
 160 {
 161         spin_lock(&ddp->map_lock);
 162         memset(&ddp->gl_map[start], 0,
 163                count * sizeof(struct cxgb3i_gather_list *));
 164         spin_unlock(&ddp->map_lock);
 165 }
 166
 167 static inline void ddp_free_gl_skb(struct cxgb3i_ddp_info *ddp,
 168                                    int idx, int count)
 169 {
 170         int i;
 171
 172         for (i = 0; i < count; i++, idx++)
 173                 if (ddp->gl_skb[idx]) {
 174                         kfree_skb(ddp->gl_skb[idx]);
 175                         ddp->gl_skb[idx] = NULL;
 176                 }
 177 }
 178
 179 static inline int ddp_alloc_gl_skb(struct cxgb3i_ddp_info *ddp, int idx,
 180                                    int count, gfp_t gfp)
 181 {
 182         int i;
 183
 184         for (i = 0; i < count; i++) {
 185                 struct sk_buff *skb = alloc_skb(sizeof(struct ulp_mem_io) +
 186                                                 PPOD_SIZE, gfp);
 187                 if (skb) {
 188                         ddp->gl_skb[idx + i] = skb;
 189                         skb_put(skb, sizeof(struct ulp_mem_io) + PPOD_SIZE);
 190                 } else {
 191                         ddp_free_gl_skb(ddp, idx, i);
 192                         return -ENOMEM;
 193                 }
 194         }
 195         return 0;
 196 }
 197
 198 /**
 199  * cxgb3i_ddp_find_page_index - return ddp page index for a given page size.
 200  * @pgsz: page size
 201  * return the ddp page index, if no match is found return DDP_PGIDX_MAX.
 202  */
 203 int cxgb3i_ddp_find_page_index(unsigned long pgsz)
 204 {
 205         int i;
 206
 207         for (i = 0; i < DDP_PGIDX_MAX; i++) {
 208                 if (pgsz == (1UL << ddp_page_shift[i]))
 209                         return i;
 210         }
 211         ddp_log_debug("ddp page size 0x%lx not supported.\n", pgsz);
 212         return DDP_PGIDX_MAX;
 213 }
 214 EXPORT_SYMBOL_GPL(cxgb3i_ddp_find_page_index);
 215
 216 static inline void ddp_gl_unmap(struct pci_dev *pdev,
 217                                 struct cxgb3i_gather_list *gl)
 218 {
 219         int i;
 220
 221         for (i = 0; i < gl->nelem; i++)
 222                 pci_unmap_page(pdev, gl->phys_addr[i], PAGE_SIZE,
 223                                PCI_DMA_FROMDEVICE);
 224 }
 225
 226 static inline int ddp_gl_map(struct pci_dev *pdev,
 227                              struct cxgb3i_gather_list *gl)
 228 {
 229         int i;
 230
 231         for (i = 0; i < gl->nelem; i++) {
 232                 gl->phys_addr[i] = pci_map_page(pdev, gl->pages[i], 0,
 233                                                 PAGE_SIZE,
 234                                                 PCI_DMA_FROMDEVICE);
 235                 if (unlikely(pci_dma_mapping_error(pdev, gl->phys_addr[i])))
 236                         goto unmap;
 237         }
 238
 239         return i;
 240
 241 unmap:
 242         if (i) {
 243                 unsigned int nelem = gl->nelem;
 244
 245                 gl->nelem = i;
 246                 ddp_gl_unmap(pdev, gl);
 247                 gl->nelem = nelem;
 248         }
 249         return -ENOMEM;
 250 }
 251
 252 /**
 253  * cxgb3i_ddp_make_gl - build ddp page buffer list
 254  * @xferlen: total buffer length
 255  * @sgl: page buffer scatter-gather list
 256  * @sgcnt: # of page buffers
 257  * @pdev: pci_dev, used for pci map
 258  * @gfp: allocation mode
 259  *
 260  * construct a ddp page buffer list from the scsi scattergather list.
 261  * coalesce buffers as much as possible, and obtain dma addresses for
 262  * each page.
 263  *
 264  * Return the cxgb3i_gather_list constructed from the page buffers if the
 265  * memory can be used for ddp. Return NULL otherwise.
 266  */
 267 struct cxgb3i_gather_list *cxgb3i_ddp_make_gl(unsigned int xferlen,
 268                                               struct scatterlist *sgl,
 269                                               unsigned int sgcnt,
 270                                               struct pci_dev *pdev,
 271                                               gfp_t gfp)
 272 {
 273         struct cxgb3i_gather_list *gl;
 274         struct scatterlist *sg = sgl;
 275         struct page *sgpage = sg_page(sg);
 276         unsigned int sglen = sg->length;
 277         unsigned int sgoffset = sg->offset;
 278         unsigned int npages = (xferlen + sgoffset + PAGE_SIZE - 1) >>
 279                               PAGE_SHIFT;
 280         int i = 1, j = 0;
 281
 282         if (xferlen < DDP_THRESHOLD) {
 283                 ddp_log_debug("xfer %u < threshold %u, no ddp.\n",
 284                               xferlen, DDP_THRESHOLD);
 285                 return NULL;
 286         }
 287
 288         gl = kzalloc(sizeof(struct cxgb3i_gather_list) +
 289                      npages * (sizeof(dma_addr_t) + sizeof(struct page *)),
 290                      gfp);
 291         if (!gl)
 292                 return NULL;
 293
 294         gl->pages = (struct page **)&gl->phys_addr[npages];
 295         gl->length = xferlen;
 296         gl->offset = sgoffset;
 297         gl->pages[0] = sgpage;
 298
 299         sg = sg_next(sg);
 300         while (sg) {
 301                 struct page *page = sg_page(sg);
 302
 303                 if (sgpage == page && sg->offset == sgoffset + sglen)
 304                         sglen += sg->length;
 305                 else {
 306                         /* make sure the sgl is fit for ddp:
 307                          * each has the same page size, and
 308                          * all of the middle pages are used completely
 309                          */
 310                         if ((j && sgoffset) ||
 311                             ((i != sgcnt - 1) &&
 312                              ((sglen + sgoffset) & ~PAGE_MASK)))
 313                                 goto error_out;
 314
 315                         j++;
 316                         if (j == gl->nelem || sg->offset)
 317                                 goto error_out;
 318                         gl->pages[j] = page;
 319                         sglen = sg->length;
 320                         sgoffset = sg->offset;
 321                         sgpage = page;
 322                 }
 323                 i++;
 324                 sg = sg_next(sg);
 325         }
 326         gl->nelem = ++j;
 327
 328         if (ddp_gl_map(pdev, gl) < 0)
 329                 goto error_out;
 330
 331         return gl;
 332
 333 error_out:
 334         kfree(gl);
 335         return NULL;
 336 }
 337 EXPORT_SYMBOL_GPL(cxgb3i_ddp_make_gl);
 338
 339 /**
 340  * cxgb3i_ddp_release_gl - release a page buffer list
 341  * @gl: a ddp page buffer list
 342  * @pdev: pci_dev used for pci_unmap
 343  * free a ddp page buffer list resulted from cxgb3i_ddp_make_gl().
 344  */
 345 void cxgb3i_ddp_release_gl(struct cxgb3i_gather_list *gl,
 346                            struct pci_dev *pdev)
 347 {
 348         ddp_gl_unmap(pdev, gl);
 349         kfree(gl);
 350 }
 351 EXPORT_SYMBOL_GPL(cxgb3i_ddp_release_gl);
 352
 353 /**
 354  * cxgb3i_ddp_tag_reserve - set up ddp for a data transfer
 355  * @tdev: t3cdev adapter
 356  * @tid: connection id
 357  * @tformat: tag format
 358  * @tagp: the s/w tag, if ddp setup is successful, it will be updated with
 359  *        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) {
 458                         ddp_log_error("release ddp 0x%x, idx 0x%x, gl NULL.\n",
 459                                       tag, idx);
 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, 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 static int ddp_init(struct t3cdev *tdev)
 569 {
 570         struct cxgb3i_ddp_info *ddp;
 571         struct ulp_iscsi_info uinfo;
 572         unsigned int ppmax, bits;
 573         int i, err;
 574         static int vers_printed;
 575
 576         if (!vers_printed) {
 577                 printk(KERN_INFO "%s", version);
 578                 vers_printed = 1;
 579         }
 580
 581         err = tdev->ctl(tdev, ULP_ISCSI_GET_PARAMS, &uinfo);
 582         if (err < 0) {
 583                 ddp_log_error("%s, failed to get iscsi param err=%d.\n",
 584                                  tdev->name, err);
 585                 return err;
 586         }
 587
 588         ppmax = (uinfo.ulimit - uinfo.llimit + 1) >> PPOD_SIZE_SHIFT;
 589         bits = __ilog2_u32(ppmax) + 1;
 590         if (bits > PPOD_IDX_MAX_SIZE)
 591                 bits = PPOD_IDX_MAX_SIZE;
 592         ppmax = (1 << (bits - 1)) - 1;
 593
 594         ddp = cxgb3i_alloc_big_mem(sizeof(struct cxgb3i_ddp_info) +
 595                                    ppmax *
 596                                         (sizeof(struct cxgb3i_gather_list *) +
 597                                         sizeof(struct sk_buff *)),
 598                                    GFP_KERNEL);
 599         if (!ddp) {
 600                 ddp_log_warn("%s unable to alloc ddp 0x%d, ddp disabled.\n",
 601                              tdev->name, ppmax);
 602                 return 0;
 603         }
 604         ddp->gl_map = (struct cxgb3i_gather_list **)(ddp + 1);
 605         ddp->gl_skb = (struct sk_buff **)(((char *)ddp->gl_map) +
 606                                           ppmax *
 607                                           sizeof(struct cxgb3i_gather_list *));
 608         spin_lock_init(&ddp->map_lock);
 609
 610         ddp->tdev = tdev;
 611         ddp->pdev = uinfo.pdev;
 612         ddp->max_txsz = min_t(unsigned int, uinfo.max_txsz, ULP2_MAX_PKT_SIZE);
 613         ddp->max_rxsz = min_t(unsigned int, uinfo.max_rxsz, ULP2_MAX_PKT_SIZE);
 614         ddp->llimit = uinfo.llimit;
 615         ddp->ulimit = uinfo.ulimit;
 616         ddp->nppods = ppmax;
 617         ddp->idx_last = ppmax;
 618         ddp->idx_bits = bits;
 619         ddp->idx_mask = (1 << bits) - 1;
 620         ddp->rsvd_tag_mask = (1 << (bits + PPOD_IDX_SHIFT)) - 1;
 621
 622         uinfo.tagmask = ddp->idx_mask << PPOD_IDX_SHIFT;
 623         for (i = 0; i < DDP_PGIDX_MAX; i++)
 624                 uinfo.pgsz_factor[i] = ddp_page_order[i];
 625         uinfo.ulimit = uinfo.llimit + (ppmax << PPOD_SIZE_SHIFT);
 626
 627         err = tdev->ctl(tdev, ULP_ISCSI_SET_PARAMS, &uinfo);
 628         if (err < 0) {
 629                 ddp_log_warn("%s unable to set iscsi param err=%d, "
 630                               "ddp disabled.\n", tdev->name, err);
 631                 goto free_ddp_map;
 632         }
 633
 634         tdev->ulp_iscsi = ddp;
 635
 636         /* add to the list */
 637         write_lock(&cxgb3i_ddp_rwlock);
 638         list_add_tail(&ddp->list, &cxgb3i_ddp_list);
 639         write_unlock(&cxgb3i_ddp_rwlock);
 640
 641         ddp_log_info("nppods %u (0x%x ~ 0x%x), bits %u, mask 0x%x,0x%x "
 642                         "pkt %u/%u, %u/%u.\n",
 643                         ppmax, ddp->llimit, ddp->ulimit, ddp->idx_bits,
 644                         ddp->idx_mask, ddp->rsvd_tag_mask,
 645                         ddp->max_txsz, uinfo.max_txsz,
 646                         ddp->max_rxsz, uinfo.max_rxsz);
 647         return 0;
 648
 649 free_ddp_map:
 650         cxgb3i_free_big_mem(ddp);
 651         return err;
 652 }
 653
 654 /**
 655  * cxgb3i_adapter_ddp_init - initialize the adapter's ddp resource
 656  * @tdev: t3cdev adapter
 657  * @tformat: tag format
 658  * @txsz: max tx pdu payload size, filled in by this func.
 659  * @rxsz: max rx pdu payload size, filled in by this func.
 660  * initialize the ddp pagepod manager for a given adapter if needed and
 661  * setup the tag format for a given iscsi entity
 662  */
 663 int cxgb3i_adapter_ddp_init(struct t3cdev *tdev,
 664                             struct cxgb3i_tag_format *tformat,
 665                             unsigned int *txsz, unsigned int *rxsz)
 666 {
 667         struct cxgb3i_ddp_info *ddp;
 668         unsigned char idx_bits;
 669
 670         if (!tformat)
 671                 return -EINVAL;
 672
 673         if (!tdev->ulp_iscsi) {
 674                 int err = ddp_init(tdev);
 675                 if (err < 0)
 676                         return err;
 677         }
 678         ddp = (struct cxgb3i_ddp_info *)tdev->ulp_iscsi;
 679
 680         idx_bits = 32 - tformat->sw_bits;
 681         tformat->rsvd_bits = ddp->idx_bits;
 682         tformat->rsvd_shift = PPOD_IDX_SHIFT;
 683         tformat->rsvd_mask = (1 << tformat->rsvd_bits) - 1;
 684
 685         ddp_log_info("tag format: sw %u, rsvd %u,%u, mask 0x%x.\n",
 686                       tformat->sw_bits, tformat->rsvd_bits,
 687                       tformat->rsvd_shift, tformat->rsvd_mask);
 688
 689         *txsz = min_t(unsigned int, ULP2_MAX_PDU_PAYLOAD,
 690                         ddp->max_txsz - ISCSI_PDU_NONPAYLOAD_LEN);
 691         *rxsz = min_t(unsigned int, ULP2_MAX_PDU_PAYLOAD,
 692                         ddp->max_rxsz - ISCSI_PDU_NONPAYLOAD_LEN);
 693         ddp_log_info("max payload size: %u/%u, %u/%u.\n",
 694                      *txsz, ddp->max_txsz, *rxsz, ddp->max_rxsz);
 695         return 0;
 696 }
 697 EXPORT_SYMBOL_GPL(cxgb3i_adapter_ddp_init);
 698
 699 static void ddp_release(struct cxgb3i_ddp_info *ddp)
 700 {
 701         int i = 0;
 702         struct t3cdev *tdev = ddp->tdev;
 703
 704         tdev->ulp_iscsi = NULL;
 705         while (i < ddp->nppods) {
 706                 struct cxgb3i_gather_list *gl = ddp->gl_map[i];
 707                 if (gl) {
 708                         int npods = (gl->nelem + PPOD_PAGES_MAX - 1)
 709                                      >> PPOD_PAGES_SHIFT;
 710
 711                         kfree(gl);
 712                         ddp_free_gl_skb(ddp, i, npods);
 713                 } else
 714                         i++;
 715         }
 716         cxgb3i_free_big_mem(ddp);
 717 }
 718
 719 /**
 720  * cxgb3i_adapter_ddp_cleanup - release the adapter's ddp resource
 721  * @tdev: t3cdev adapter
 722  * release all the resource held by the ddp pagepod manager for a given
 723  * adapter if needed
 724  */
 725 void cxgb3i_adapter_ddp_cleanup(struct t3cdev *tdev)
 726 {
 727         struct cxgb3i_ddp_info *ddp;
 728
 729         /* remove from the list */
 730         write_lock(&cxgb3i_ddp_rwlock);
 731         list_for_each_entry(ddp, &cxgb3i_ddp_list, list) {
 732                 if (ddp->tdev == tdev) {
 733                         list_del(&ddp->list);
 734                         break;
 735                 }
 736         }
 737         write_unlock(&cxgb3i_ddp_rwlock);
 738
 739         if (ddp)
 740                 ddp_release(ddp);
 741 }
 742 EXPORT_SYMBOL_GPL(cxgb3i_adapter_ddp_cleanup);
 743
 744 /**
 745  * cxgb3i_ddp_init_module - module init entry point
 746  * initialize any driver wide global data structures
 747  */
 748 static int __init cxgb3i_ddp_init_module(void)
 749 {
 750         page_idx = cxgb3i_ddp_find_page_index(PAGE_SIZE);
 751         ddp_log_info("system PAGE_SIZE %lu, ddp idx %u.\n",
 752                      PAGE_SIZE, page_idx);
 753         return 0;
 754 }
 755
 756 /**
 757  * cxgb3i_ddp_exit_module - module cleanup/exit entry point
 758  * go through the ddp list and release any resource held.
 759  */
 760 static void __exit cxgb3i_ddp_exit_module(void)
 761 {
 762         struct cxgb3i_ddp_info *ddp;
 763
 764         /* release all ddp manager if there is any */
 765         write_lock(&cxgb3i_ddp_rwlock);
 766         list_for_each_entry(ddp, &cxgb3i_ddp_list, list) {
 767                 list_del(&ddp->list);
 768                 ddp_release(ddp);
 769         }
 770         write_unlock(&cxgb3i_ddp_rwlock);
 771 }
 772
 773 module_init(cxgb3i_ddp_init_module);
 774 module_exit(cxgb3i_ddp_exit_module);