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 ddp_log_error(fmt...) printk(KERN_ERR "cxgb3i_ddp: ERR! " fmt)
  27 #define ddp_log_warn(fmt...)  printk(KERN_WARNING "cxgb3i_ddp: WARN! " fmt)
  28 #define ddp_log_info(fmt...)  printk(KERN_INFO "cxgb3i_ddp: " fmt)
  29
  30 #ifdef __DEBUG_CXGB3I_DDP__
  31 #define ddp_log_debug(fmt, args...) \
  32         printk(KERN_INFO "cxgb3i_ddp: %s - " fmt, __func__ , ## args)
  33 #else
  34 #define ddp_log_debug(fmt...)
  35 #endif
  36
  37 /*
  38  * iSCSI Direct Data Placement
  39  *
  40  * T3 h/w can directly place the iSCSI Data-In or Data-Out PDU's payload into
  41  * pre-posted final destination host-memory buffers based on the Initiator
  42  * Task Tag (ITT) in Data-In or Target Task Tag (TTT) in Data-Out PDUs.
  43  *
  44  * The host memory address is programmed into h/w in the format of pagepod
  45  * entries.
  46  * The location of the pagepod entry is encoded into ddp tag which is used or
  47  * is the base for ITT/TTT.
  48  */
  49
  50 #define DDP_PGIDX_MAX           4
  51 #define DDP_THRESHOLD   2048
  52 static unsigned char ddp_page_order[DDP_PGIDX_MAX] = {0, 1, 2, 4};
  53 static unsigned char ddp_page_shift[DDP_PGIDX_MAX] = {12, 13, 14, 16};
  54 static unsigned char page_idx = DDP_PGIDX_MAX;
  55
  56 /*
  57  * functions to program the pagepod in h/w
  58  */
  59 static inline void ulp_mem_io_set_hdr(struct sk_buff *skb, unsigned int addr)
  60 {
  61         struct ulp_mem_io *req = (struct ulp_mem_io *)skb->head;
  62
  63         req->wr.wr_lo = 0;
  64         req->wr.wr_hi = htonl(V_WR_OP(FW_WROPCODE_BYPASS));
  65         req->cmd_lock_addr = htonl(V_ULP_MEMIO_ADDR(addr >> 5) |
  66                                    V_ULPTX_CMD(ULP_MEM_WRITE));
  67         req->len = htonl(V_ULP_MEMIO_DATA_LEN(PPOD_SIZE >> 5) |
  68                          V_ULPTX_NFLITS((PPOD_SIZE >> 3) + 1));
  69 }
  70
  71 static int set_ddp_map(struct cxgb3i_ddp_info *ddp, struct pagepod_hdr *hdr,
  72                        unsigned int idx, unsigned int npods,
  73                        struct cxgb3i_gather_list *gl)
  74 {
  75         unsigned int pm_addr = (idx << PPOD_SIZE_SHIFT) + ddp->llimit;
  76         int i;
  77
  78         for (i = 0; i < npods; i++, idx++, pm_addr += PPOD_SIZE) {
  79                 struct sk_buff *skb = ddp->gl_skb[idx];
  80                 struct pagepod *ppod;
  81                 int j, pidx;
  82
  83                 /* hold on to the skb until we clear the ddp mapping */
  84                 skb_get(skb);
  85
  86                 ulp_mem_io_set_hdr(skb, pm_addr);
  87                 ppod = (struct pagepod *)
  88                        (skb->head + sizeof(struct ulp_mem_io));
  89                 memcpy(&(ppod->hdr), hdr, sizeof(struct pagepod));
  90                 for (pidx = 4 * i, j = 0; j < 5; ++j, ++pidx)
  91                         ppod->addr[j] = pidx < gl->nelem ?
  92                                      cpu_to_be64(gl->phys_addr[pidx]) : 0UL;
  93
  94                 skb->priority = CPL_PRIORITY_CONTROL;
  95                 cxgb3_ofld_send(ddp->tdev, skb);
  96         }
  97         return 0;
  98 }
  99
 100 static void clear_ddp_map(struct cxgb3i_ddp_info *ddp, unsigned int tag,
 101                          unsigned int idx, unsigned int npods)
 102 {
 103         unsigned int pm_addr = (idx << PPOD_SIZE_SHIFT) + ddp->llimit;
 104         int i;
 105
 106         for (i = 0; i < npods; i++, idx++, pm_addr += PPOD_SIZE) {
 107                 struct sk_buff *skb = ddp->gl_skb[idx];
 108
 109                 if (!skb) {
 110                         ddp_log_error("ddp tag 0x%x, 0x%x, %d/%u, skb NULL.\n",
 111                                         tag, idx, i, npods);
 112                         continue;
 113                 }
 114                 ddp->gl_skb[idx] = NULL;
 115                 memset((skb->head + sizeof(struct ulp_mem_io)), 0, PPOD_SIZE);
 116                 ulp_mem_io_set_hdr(skb, pm_addr);
 117                 skb->priority = CPL_PRIORITY_CONTROL;
 118                 cxgb3_ofld_send(ddp->tdev, skb);
 119         }
 120 }
 121
 122 static inline int ddp_find_unused_entries(struct cxgb3i_ddp_info *ddp,
 123                                           int start, int max, int count,
 124                                           struct cxgb3i_gather_list *gl)
 125 {
 126         unsigned int i, j;
 127
 128         spin_lock(&ddp->map_lock);
 129         for (i = start; i <= max;) {
 130                 for (j = 0; j < count; j++) {
 131                         if (ddp->gl_map[i + j])
 132                                 break;
 133                 }
 134                 if (j == count) {
 135                         for (j = 0; j < count; j++)
 136                                 ddp->gl_map[i + j] = gl;
 137                         spin_unlock(&ddp->map_lock);
 138                         return i;
 139                 }
 140                 i += j + 1;
 141         }
 142         spin_unlock(&ddp->map_lock);
 143         return -EBUSY;
 144 }
 145
 146 static inline void ddp_unmark_entries(struct cxgb3i_ddp_info *ddp,
 147                                       int start, int count)
 148 {
 149         spin_lock(&ddp->map_lock);
 150         memset(&ddp->gl_map[start], 0,
 151                count * sizeof(struct cxgb3i_gather_list *));
 152         spin_unlock(&ddp->map_lock);
 153 }
 154
 155 static inline void ddp_free_gl_skb(struct cxgb3i_ddp_info *ddp,
 156                                    int idx, int count)
 157 {
 158         int i;
 159
 160         for (i = 0; i < count; i++, idx++)
 161                 if (ddp->gl_skb[idx]) {
 162                         kfree_skb(ddp->gl_skb[idx]);
 163                         ddp->gl_skb[idx] = NULL;
 164                 }
 165 }
 166
 167 static inline int ddp_alloc_gl_skb(struct cxgb3i_ddp_info *ddp, int idx,
 168                                    int count, gfp_t gfp)
 169 {
 170         int i;
 171
 172         for (i = 0; i < count; i++) {
 173                 struct sk_buff *skb = alloc_skb(sizeof(struct ulp_mem_io) +
 174                                                 PPOD_SIZE, gfp);
 175                 if (skb) {
 176                         ddp->gl_skb[idx + i] = skb;
 177                         skb_put(skb, sizeof(struct ulp_mem_io) + PPOD_SIZE);
 178                 } else {
 179                         ddp_free_gl_skb(ddp, idx, i);
 180                         return -ENOMEM;
 181                 }
 182         }
 183         return 0;
 184 }
 185
 186 /**
 187  * cxgb3i_ddp_find_page_index - return ddp page index for a given page size
 188  * @pgsz: page size
 189  * return the ddp page index, if no match is found return DDP_PGIDX_MAX.
 190  */
 191 int cxgb3i_ddp_find_page_index(unsigned long pgsz)
 192 {
 193         int i;
 194
 195         for (i = 0; i < DDP_PGIDX_MAX; i++) {
 196                 if (pgsz == (1UL << ddp_page_shift[i]))
 197                         return i;
 198         }
 199         ddp_log_debug("ddp page size 0x%lx not supported.\n", pgsz);
 200         return DDP_PGIDX_MAX;
 201 }
 202
 203 static inline void ddp_gl_unmap(struct pci_dev *pdev,
 204                                 struct cxgb3i_gather_list *gl)
 205 {
 206         int i;
 207
 208         for (i = 0; i < gl->nelem; i++)
 209                 pci_unmap_page(pdev, gl->phys_addr[i], PAGE_SIZE,
 210                                PCI_DMA_FROMDEVICE);
 211 }
 212
 213 static inline int ddp_gl_map(struct pci_dev *pdev,
 214                              struct cxgb3i_gather_list *gl)
 215 {
 216         int i;
 217
 218         for (i = 0; i < gl->nelem; i++) {
 219                 gl->phys_addr[i] = pci_map_page(pdev, gl->pages[i], 0,
 220                                                 PAGE_SIZE,
 221                                                 PCI_DMA_FROMDEVICE);
 222                 if (unlikely(pci_dma_mapping_error(pdev, gl->phys_addr[i])))
 223                         goto unmap;
 224         }
 225
 226         return i;
 227
 228 unmap:
 229         if (i) {
 230                 unsigned int nelem = gl->nelem;
 231
 232                 gl->nelem = i;
 233                 ddp_gl_unmap(pdev, gl);
 234                 gl->nelem = nelem;
 235         }
 236         return -ENOMEM;
 237 }
 238
 239 /**
 240  * cxgb3i_ddp_make_gl - build ddp page buffer list
 241  * @xferlen: total buffer length
 242  * @sgl: page buffer scatter-gather list
 243  * @sgcnt: # of page buffers
 244  * @pdev: pci_dev, used for pci map
 245  * @gfp: allocation mode
 246  *
 247  * construct a ddp page buffer list from the scsi scattergather list.
 248  * coalesce buffers as much as possible, and obtain dma addresses for
 249  * each page.
 250  *
 251  * Return the cxgb3i_gather_list constructed from the page buffers if the
 252  * memory can be used for ddp. Return NULL otherwise.
 253  */
 254 struct cxgb3i_gather_list *cxgb3i_ddp_make_gl(unsigned int xferlen,
 255                                               struct scatterlist *sgl,
 256                                               unsigned int sgcnt,
 257                                               struct pci_dev *pdev,
 258                                               gfp_t gfp)
 259 {
 260         struct cxgb3i_gather_list *gl;
 261         struct scatterlist *sg = sgl;
 262         struct page *sgpage = sg_page(sg);
 263         unsigned int sglen = sg->length;
 264         unsigned int sgoffset = sg->offset;
 265         unsigned int npages = (xferlen + sgoffset + PAGE_SIZE - 1) >>
 266                               PAGE_SHIFT;
 267         int i = 1, j = 0;
 268
 269         if (xferlen < DDP_THRESHOLD) {
 270                 ddp_log_debug("xfer %u < threshold %u, no ddp.\n",
 271                               xferlen, DDP_THRESHOLD);
 272                 return NULL;
 273         }
 274
 275         gl = kzalloc(sizeof(struct cxgb3i_gather_list) +
 276                      npages * (sizeof(dma_addr_t) + sizeof(struct page *)),
 277                      gfp);
 278         if (!gl)
 279                 return NULL;
 280
 281         gl->pages = (struct page **)&gl->phys_addr[npages];
 282         gl->length = xferlen;
 283         gl->offset = sgoffset;
 284         gl->pages[0] = sgpage;
 285
 286         sg = sg_next(sg);
 287         while (sg) {
 288                 struct page *page = sg_page(sg);
 289
 290                 if (sgpage == page && sg->offset == sgoffset + sglen)
 291                         sglen += sg->length;
 292                 else {
 293                         /* make sure the sgl is fit for ddp:
 294                          * each has the same page size, and
 295                          * all of the middle pages are used completely
 296                          */
 297                         if ((j && sgoffset) ||
 298                             ((i != sgcnt - 1) &&
 299                              ((sglen + sgoffset) & ~PAGE_MASK)))
 300                                 goto error_out;
 301
 302                         j++;
 303                         if (j == gl->nelem || sg->offset)
 304                                 goto error_out;
 305                         gl->pages[j] = page;
 306                         sglen = sg->length;
 307                         sgoffset = sg->offset;
 308                         sgpage = page;
 309                 }
 310                 i++;
 311                 sg = sg_next(sg);
 312         }
 313         gl->nelem = ++j;
 314
 315         if (ddp_gl_map(pdev, gl) < 0)
 316                 goto error_out;
 317
 318         return gl;
 319
 320 error_out:
 321         kfree(gl);
 322         return NULL;
 323 }
 324
 325 /**
 326  * cxgb3i_ddp_release_gl - release a page buffer list
 327  * @gl: a ddp page buffer list
 328  * @pdev: pci_dev used for pci_unmap
 329  * free a ddp page buffer list resulted from cxgb3i_ddp_make_gl().
 330  */
 331 void cxgb3i_ddp_release_gl(struct cxgb3i_gather_list *gl,
 332                            struct pci_dev *pdev)
 333 {
 334         ddp_gl_unmap(pdev, gl);
 335         kfree(gl);
 336 }
 337
 338 /**
 339  * cxgb3i_ddp_tag_reserve - set up ddp for a data transfer
 340  * @tdev: t3cdev adapter
 341  * @tid: connection id
 342  * @tformat: tag format
 343  * @tagp: contains s/w tag initially, will be updated with ddp/hw tag
 344  * @gl: the page momory list
 345  * @gfp: allocation mode
 346  *
 347  * ddp setup for a given page buffer list and construct the ddp tag.
 348  * return 0 if success, < 0 otherwise.
 349  */
 350 int cxgb3i_ddp_tag_reserve(struct t3cdev *tdev, unsigned int tid,
 351                            struct cxgb3i_tag_format *tformat, u32 *tagp,
 352                            struct cxgb3i_gather_list *gl, gfp_t gfp)
 353 {
 354         struct cxgb3i_ddp_info *ddp = tdev->ulp_iscsi;
 355         struct pagepod_hdr hdr;
 356         unsigned int npods;
 357         int idx = -1, idx_max;
 358         int err = -ENOMEM;
 359         u32 sw_tag = *tagp;
 360         u32 tag;
 361
 362         if (page_idx >= DDP_PGIDX_MAX || !ddp || !gl || !gl->nelem ||
 363                 gl->length < DDP_THRESHOLD) {
 364                 ddp_log_debug("pgidx %u, xfer %u/%u, NO ddp.\n",
 365                               page_idx, gl->length, DDP_THRESHOLD);
 366                 return -EINVAL;
 367         }
 368
 369         npods = (gl->nelem + PPOD_PAGES_MAX - 1) >> PPOD_PAGES_SHIFT;
 370         idx_max = ddp->nppods - npods + 1;
 371
 372         if (ddp->idx_last == ddp->nppods)
 373                 idx = ddp_find_unused_entries(ddp, 0, idx_max, npods, gl);
 374         else {
 375                 idx = ddp_find_unused_entries(ddp, ddp->idx_last + 1,
 376                                               idx_max, npods, gl);
 377                 if (idx < 0 && ddp->idx_last >= npods)
 378                         idx = ddp_find_unused_entries(ddp, 0,
 379                                                       ddp->idx_last - npods + 1,
 380                                                       npods, gl);
 381         }
 382         if (idx < 0) {
 383                 ddp_log_debug("xferlen %u, gl %u, npods %u NO DDP.\n",
 384                               gl->length, gl->nelem, npods);
 385                 return idx;
 386         }
 387
 388         err = ddp_alloc_gl_skb(ddp, idx, npods, gfp);
 389         if (err < 0)
 390                 goto unmark_entries;
 391
 392         tag = cxgb3i_ddp_tag_base(tformat, sw_tag);
 393         tag |= idx << PPOD_IDX_SHIFT;
 394
 395         hdr.rsvd = 0;
 396         hdr.vld_tid = htonl(F_PPOD_VALID | V_PPOD_TID(tid));
 397         hdr.pgsz_tag_clr = htonl(tag & ddp->rsvd_tag_mask);
 398         hdr.maxoffset = htonl(gl->length);
 399         hdr.pgoffset = htonl(gl->offset);
 400
 401         err = set_ddp_map(ddp, &hdr, idx, npods, gl);
 402         if (err < 0)
 403                 goto free_gl_skb;
 404
 405         ddp->idx_last = idx;
 406         ddp_log_debug("xfer %u, gl %u,%u, tid 0x%x, 0x%x -> 0x%x(%u,%u).\n",
 407                       gl->length, gl->nelem, gl->offset, tid, sw_tag, tag,
 408                       idx, npods);
 409         *tagp = tag;
 410         return 0;
 411
 412 free_gl_skb:
 413         ddp_free_gl_skb(ddp, idx, npods);
 414 unmark_entries:
 415         ddp_unmark_entries(ddp, idx, npods);
 416         return err;
 417 }
 418
 419 /**
 420  * cxgb3i_ddp_tag_release - release a ddp tag
 421  * @tdev: t3cdev adapter
 422  * @tag: ddp tag
 423  * ddp cleanup for a given ddp tag and release all the resources held
 424  */
 425 void cxgb3i_ddp_tag_release(struct t3cdev *tdev, u32 tag)
 426 {
 427         struct cxgb3i_ddp_info *ddp = tdev->ulp_iscsi;
 428         u32 idx;
 429
 430         if (!ddp) {
 431                 ddp_log_error("release ddp tag 0x%x, ddp NULL.\n", tag);
 432                 return;
 433         }
 434
 435         idx = (tag >> PPOD_IDX_SHIFT) & ddp->idx_mask;
 436         if (idx < ddp->nppods) {
 437                 struct cxgb3i_gather_list *gl = ddp->gl_map[idx];
 438                 unsigned int npods;
 439
 440                 if (!gl || !gl->nelem) {
 441                         ddp_log_error("release 0x%x, idx 0x%x, gl 0x%p, %u.\n",
 442                                       tag, idx, gl, gl ? gl->nelem : 0);
 443                         return;
 444                 }
 445                 npods = (gl->nelem + PPOD_PAGES_MAX - 1) >> PPOD_PAGES_SHIFT;
 446                 ddp_log_debug("ddp tag 0x%x, release idx 0x%x, npods %u.\n",
 447                               tag, idx, npods);
 448                 clear_ddp_map(ddp, tag, idx, npods);
 449                 ddp_unmark_entries(ddp, idx, npods);
 450                 cxgb3i_ddp_release_gl(gl, ddp->pdev);
 451         } else
 452                 ddp_log_error("ddp tag 0x%x, idx 0x%x > max 0x%x.\n",
 453                               tag, idx, ddp->nppods);
 454 }
 455
 456 static int setup_conn_pgidx(struct t3cdev *tdev, unsigned int tid, int pg_idx,
 457                             int reply)
 458 {
 459         struct sk_buff *skb = alloc_skb(sizeof(struct cpl_set_tcb_field),
 460                                         GFP_KERNEL);
 461         struct cpl_set_tcb_field *req;
 462         u64 val = pg_idx < DDP_PGIDX_MAX ? pg_idx : 0;
 463
 464         if (!skb)
 465                 return -ENOMEM;
 466
 467         /* set up ulp submode and page size */
 468         req = (struct cpl_set_tcb_field *)skb_put(skb, sizeof(*req));
 469         req->wr.wr_hi = htonl(V_WR_OP(FW_WROPCODE_FORWARD));
 470         OPCODE_TID(req) = htonl(MK_OPCODE_TID(CPL_SET_TCB_FIELD, tid));
 471         req->reply = V_NO_REPLY(reply ? 0 : 1);
 472         req->cpu_idx = 0;
 473         req->word = htons(31);
 474         req->mask = cpu_to_be64(0xF0000000);
 475         req->val = cpu_to_be64(val << 28);
 476         skb->priority = CPL_PRIORITY_CONTROL;
 477
 478         cxgb3_ofld_send(tdev, skb);
 479         return 0;
 480 }
 481
 482 /**
 483  * cxgb3i_setup_conn_host_pagesize - setup the conn.'s ddp page size
 484  * @tdev: t3cdev adapter
 485  * @tid: connection id
 486  * @reply: request reply from h/w
 487  * set up the ddp page size based on the host PAGE_SIZE for a connection
 488  * identified by tid
 489  */
 490 int cxgb3i_setup_conn_host_pagesize(struct t3cdev *tdev, unsigned int tid,
 491                                     int reply)
 492 {
 493         return setup_conn_pgidx(tdev, tid, page_idx, reply);
 494 }
 495
 496 /**
 497  * cxgb3i_setup_conn_pagesize - setup the conn.'s ddp page size
 498  * @tdev: t3cdev adapter
 499  * @tid: connection id
 500  * @reply: request reply from h/w
 501  * @pgsz: ddp page size
 502  * set up the ddp page size for a connection identified by tid
 503  */
 504 int cxgb3i_setup_conn_pagesize(struct t3cdev *tdev, unsigned int tid,
 505                                 int reply, unsigned long pgsz)
 506 {
 507         int pgidx = cxgb3i_ddp_find_page_index(pgsz);
 508
 509         return setup_conn_pgidx(tdev, tid, pgidx, reply);
 510 }
 511
 512 /**
 513  * cxgb3i_setup_conn_digest - setup conn. digest setting
 514  * @tdev: t3cdev adapter
 515  * @tid: connection id
 516  * @hcrc: header digest enabled
 517  * @dcrc: data digest enabled
 518  * @reply: request reply from h/w
 519  * set up the iscsi digest settings for a connection identified by tid
 520  */
 521 int cxgb3i_setup_conn_digest(struct t3cdev *tdev, unsigned int tid,
 522                              int hcrc, int dcrc, int reply)
 523 {
 524         struct sk_buff *skb = alloc_skb(sizeof(struct cpl_set_tcb_field),
 525                                         GFP_KERNEL);
 526         struct cpl_set_tcb_field *req;
 527         u64 val = (hcrc ? 1 : 0) | (dcrc ? 2 : 0);
 528
 529         if (!skb)
 530                 return -ENOMEM;
 531
 532         /* set up ulp submode and page size */
 533         req = (struct cpl_set_tcb_field *)skb_put(skb, sizeof(*req));
 534         req->wr.wr_hi = htonl(V_WR_OP(FW_WROPCODE_FORWARD));
 535         OPCODE_TID(req) = htonl(MK_OPCODE_TID(CPL_SET_TCB_FIELD, tid));
 536         req->reply = V_NO_REPLY(reply ? 0 : 1);
 537         req->cpu_idx = 0;
 538         req->word = htons(31);
 539         req->mask = cpu_to_be64(0x0F000000);
 540         req->val = cpu_to_be64(val << 24);
 541         skb->priority = CPL_PRIORITY_CONTROL;
 542
 543         cxgb3_ofld_send(tdev, skb);
 544         return 0;
 545 }
 546
 547
 548 /**
 549  * cxgb3i_adapter_ddp_info - read the adapter's ddp information
 550  * @tdev: t3cdev adapter
 551  * @tformat: tag format
 552  * @txsz: max tx pdu payload size, filled in by this func.
 553  * @rxsz: max rx pdu payload size, filled in by this func.
 554  * setup the tag format for a given iscsi entity
 555  */
 556 int cxgb3i_adapter_ddp_info(struct t3cdev *tdev,
 557                             struct cxgb3i_tag_format *tformat,
 558                             unsigned int *txsz, unsigned int *rxsz)
 559 {
 560         struct cxgb3i_ddp_info *ddp;
 561         unsigned char idx_bits;
 562
 563         if (!tformat)
 564                 return -EINVAL;
 565
 566         if (!tdev->ulp_iscsi)
 567                 return -EINVAL;
 568
 569         ddp = (struct cxgb3i_ddp_info *)tdev->ulp_iscsi;
 570
 571         idx_bits = 32 - tformat->sw_bits;
 572         tformat->rsvd_bits = ddp->idx_bits;
 573         tformat->rsvd_shift = PPOD_IDX_SHIFT;
 574         tformat->rsvd_mask = (1 << tformat->rsvd_bits) - 1;
 575
 576         ddp_log_info("tag format: sw %u, rsvd %u,%u, mask 0x%x.\n",
 577                       tformat->sw_bits, tformat->rsvd_bits,
 578                       tformat->rsvd_shift, tformat->rsvd_mask);
 579
 580         *txsz = min_t(unsigned int, ULP2_MAX_PDU_PAYLOAD,
 581                         ddp->max_txsz - ISCSI_PDU_NONPAYLOAD_LEN);
 582         *rxsz = min_t(unsigned int, ULP2_MAX_PDU_PAYLOAD,
 583                         ddp->max_rxsz - ISCSI_PDU_NONPAYLOAD_LEN);
 584         ddp_log_info("max payload size: %u/%u, %u/%u.\n",
 585                      *txsz, ddp->max_txsz, *rxsz, ddp->max_rxsz);
 586         return 0;
 587 }
 588
 589 /**
 590  * cxgb3i_ddp_cleanup - release the cxgb3 adapter's ddp resource
 591  * @tdev: t3cdev adapter
 592  * release all the resource held by the ddp pagepod manager for a given
 593  * adapter if needed
 594  */
 595 void cxgb3i_ddp_cleanup(struct t3cdev *tdev)
 596 {
 597         int i = 0;
 598         struct cxgb3i_ddp_info *ddp = (struct cxgb3i_ddp_info *)tdev->ulp_iscsi;
 599
 600         ddp_log_info("t3dev 0x%p, release ddp 0x%p.\n", tdev, ddp);
 601
 602         if (ddp) {
 603                 tdev->ulp_iscsi = NULL;
 604                 while (i < ddp->nppods) {
 605                         struct cxgb3i_gather_list *gl = ddp->gl_map[i];
 606                         if (gl) {
 607                                 int npods = (gl->nelem + PPOD_PAGES_MAX - 1)
 608                                                 >> PPOD_PAGES_SHIFT;
 609                                 ddp_log_info("t3dev 0x%p, ddp %d + %d.\n",
 610                                                 tdev, i, npods);
 611                                 kfree(gl);
 612                                 ddp_free_gl_skb(ddp, i, npods);
 613                                 i += npods;
 614                         } else
 615                                 i++;
 616                 }
 617                 cxgb3i_free_big_mem(ddp);
 618         }
 619 }
 620
 621 /**
 622  * ddp_init - initialize the cxgb3 adapter's ddp resource
 623  * @tdev: t3cdev adapter
 624  * initialize the ddp pagepod manager for a given adapter
 625  */
 626 static void ddp_init(struct t3cdev *tdev)
 627 {
 628         struct cxgb3i_ddp_info *ddp;
 629         struct ulp_iscsi_info uinfo;
 630         unsigned int ppmax, bits;
 631         int i, err;
 632
 633         if (tdev->ulp_iscsi) {
 634                 ddp_log_warn("t3dev 0x%p, ddp 0x%p already set up.\n",
 635                                 tdev, tdev->ulp_iscsi);
 636                 return;
 637         }
 638
 639         err = tdev->ctl(tdev, ULP_ISCSI_GET_PARAMS, &uinfo);
 640         if (err < 0) {
 641                 ddp_log_error("%s, failed to get iscsi param err=%d.\n",
 642                                  tdev->name, err);
 643                 return;
 644         }
 645
 646         ppmax = (uinfo.ulimit - uinfo.llimit + 1) >> PPOD_SIZE_SHIFT;
 647         bits = __ilog2_u32(ppmax) + 1;
 648         if (bits > PPOD_IDX_MAX_SIZE)
 649                 bits = PPOD_IDX_MAX_SIZE;
 650         ppmax = (1 << (bits - 1)) - 1;
 651
 652         ddp = cxgb3i_alloc_big_mem(sizeof(struct cxgb3i_ddp_info) +
 653                                    ppmax *
 654                                         (sizeof(struct cxgb3i_gather_list *) +
 655                                         sizeof(struct sk_buff *)),
 656                                    GFP_KERNEL);
 657         if (!ddp) {
 658                 ddp_log_warn("%s unable to alloc ddp 0x%d, ddp disabled.\n",
 659                              tdev->name, ppmax);
 660                 return;
 661         }
 662         ddp->gl_map = (struct cxgb3i_gather_list **)(ddp + 1);
 663         ddp->gl_skb = (struct sk_buff **)(((char *)ddp->gl_map) +
 664                                           ppmax *
 665                                           sizeof(struct cxgb3i_gather_list *));
 666         spin_lock_init(&ddp->map_lock);
 667
 668         ddp->tdev = tdev;
 669         ddp->pdev = uinfo.pdev;
 670         ddp->max_txsz = min_t(unsigned int, uinfo.max_txsz, ULP2_MAX_PKT_SIZE);
 671         ddp->max_rxsz = min_t(unsigned int, uinfo.max_rxsz, ULP2_MAX_PKT_SIZE);
 672         ddp->llimit = uinfo.llimit;
 673         ddp->ulimit = uinfo.ulimit;
 674         ddp->nppods = ppmax;
 675         ddp->idx_last = ppmax;
 676         ddp->idx_bits = bits;
 677         ddp->idx_mask = (1 << bits) - 1;
 678         ddp->rsvd_tag_mask = (1 << (bits + PPOD_IDX_SHIFT)) - 1;
 679
 680         uinfo.tagmask = ddp->idx_mask << PPOD_IDX_SHIFT;
 681         for (i = 0; i < DDP_PGIDX_MAX; i++)
 682                 uinfo.pgsz_factor[i] = ddp_page_order[i];
 683         uinfo.ulimit = uinfo.llimit + (ppmax << PPOD_SIZE_SHIFT);
 684
 685         err = tdev->ctl(tdev, ULP_ISCSI_SET_PARAMS, &uinfo);
 686         if (err < 0) {
 687                 ddp_log_warn("%s unable to set iscsi param err=%d, "
 688                               "ddp disabled.\n", tdev->name, err);
 689                 goto free_ddp_map;
 690         }
 691
 692         tdev->ulp_iscsi = ddp;
 693
 694         ddp_log_info("tdev 0x%p, nppods %u, bits %u, mask 0x%x,0x%x pkt %u/%u,"
 695                         " %u/%u.\n",
 696                         tdev, ppmax, ddp->idx_bits, ddp->idx_mask,
 697                         ddp->rsvd_tag_mask, ddp->max_txsz, uinfo.max_txsz,
 698                         ddp->max_rxsz, uinfo.max_rxsz);
 699         return;
 700
 701 free_ddp_map:
 702         cxgb3i_free_big_mem(ddp);
 703 }
 704
 705 /**
 706  * cxgb3i_ddp_init - initialize ddp functions
 707  */
 708 void cxgb3i_ddp_init(struct t3cdev *tdev)
 709 {
 710         if (page_idx == DDP_PGIDX_MAX) {
 711                 page_idx = cxgb3i_ddp_find_page_index(PAGE_SIZE);
 712                 ddp_log_info("system PAGE_SIZE %lu, ddp idx %u.\n",
 713                                 PAGE_SIZE, page_idx);
 714         }
 715         ddp_init(tdev);
 716 }