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   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
  15 /* from cxgb3 LLD */
  16 #include "common.h"
  17 #include "t3_cpl.h"
  18 #include "t3cdev.h"
  19 #include "cxgb3_ctl_defs.h"
  20 #include "cxgb3_offload.h"
  21 #include "firmware_exports.h"
  22
  23 #include "cxgb3i_ddp.h"
  24
  25 #define DRV_MODULE_NAME         "cxgb3i_ddp"
  26 #define DRV_MODULE_VERSION      "1.0.0"
  27 #define DRV_MODULE_RELDATE      "Dec. 1, 2008"
  28
  29 static char version[] =
  30         "Chelsio S3xx iSCSI DDP " DRV_MODULE_NAME
  31         " v" DRV_MODULE_VERSION " (" DRV_MODULE_RELDATE ")\n";
  32
  33 MODULE_AUTHOR("Karen Xie <kxie@chelsio.com>");
  34 MODULE_DESCRIPTION("cxgb3i ddp pagepod manager");
  35 MODULE_LICENSE("GPL");
  36 MODULE_VERSION(DRV_MODULE_VERSION);
  37
  38 #define ddp_log_error(fmt...) printk(KERN_ERR "cxgb3i_ddp: ERR! " fmt)
  39 #define ddp_log_warn(fmt...)  printk(KERN_WARNING "cxgb3i_ddp: WARN! " fmt)
  40 #define ddp_log_info(fmt...)  printk(KERN_INFO "cxgb3i_ddp: " fmt)
  41
  42 #ifdef __DEBUG_CXGB3I_DDP__
  43 #define ddp_log_debug(fmt, args...) \
  44         printk(KERN_INFO "cxgb3i_ddp: %s - " fmt, __func__ , ## args)
  45 #else
  46 #define ddp_log_debug(fmt...)
  47 #endif
  48
  49 /*
  50  * iSCSI Direct Data Placement
  51  *
  52  * T3 h/w can directly place the iSCSI Data-In or Data-Out PDU's payload into
  53  * pre-posted final destination host-memory buffers based on the Initiator
  54  * Task Tag (ITT) in Data-In or Target Task Tag (TTT) in Data-Out PDUs.
  55  *
  56  * The host memory address is programmed into h/w in the format of pagepod
  57  * entries.
  58  * The location of the pagepod entry is encoded into ddp tag which is used or
  59  * is the base for ITT/TTT.
  60  */
  61
  62 #define DDP_PGIDX_MAX           4
  63 #define DDP_THRESHOLD   2048
  64 static unsigned char ddp_page_order[DDP_PGIDX_MAX] = {0, 1, 2, 4};
  65 static unsigned char ddp_page_shift[DDP_PGIDX_MAX] = {12, 13, 14, 16};
  66 static unsigned char page_idx = DDP_PGIDX_MAX;
  67
  68 static LIST_HEAD(cxgb3i_ddp_list);
  69 static DEFINE_RWLOCK(cxgb3i_ddp_rwlock);
  70
  71 /*
  72  * functions to program the pagepod in h/w
  73  */
  74 static inline void ulp_mem_io_set_hdr(struct sk_buff *skb, unsigned int addr)
  75 {
  76         struct ulp_mem_io *req = (struct ulp_mem_io *)skb->head;
  77
  78         req->wr.wr_lo = 0;
  79         req->wr.wr_hi = htonl(V_WR_OP(FW_WROPCODE_BYPASS));
  80         req->cmd_lock_addr = htonl(V_ULP_MEMIO_ADDR(addr >> 5) |
  81                                    V_ULPTX_CMD(ULP_MEM_WRITE));
  82         req->len = htonl(V_ULP_MEMIO_DATA_LEN(PPOD_SIZE >> 5) |
  83                          V_ULPTX_NFLITS((PPOD_SIZE >> 3) + 1));
  84 }
  85
  86 static int set_ddp_map(struct cxgb3i_ddp_info *ddp, struct pagepod_hdr *hdr,
  87                        unsigned int idx, unsigned int npods,
  88                        struct cxgb3i_gather_list *gl)
  89 {
  90         unsigned int pm_addr = (idx << PPOD_SIZE_SHIFT) + ddp->llimit;
  91         int i;
  92
  93         for (i = 0; i < npods; i++, idx++, pm_addr += PPOD_SIZE) {
  94                 struct sk_buff *skb = ddp->gl_skb[idx];
  95                 struct pagepod *ppod;
  96                 int j, pidx;
  97
  98                 /* hold on to the skb until we clear the ddp mapping */
  99                 skb_get(skb);
 100
 101                 ulp_mem_io_set_hdr(skb, pm_addr);
 102                 ppod = (struct pagepod *)
 103                        (skb->head + sizeof(struct ulp_mem_io));
 104                 memcpy(&(ppod->hdr), hdr, sizeof(struct pagepod));
 105                 for (pidx = 4 * i, j = 0; j < 5; ++j, ++pidx)
 106                         ppod->addr[j] = pidx < gl->nelem ?
 107                                      cpu_to_be64(gl->phys_addr[pidx]) : 0UL;
 108
 109                 skb->priority = CPL_PRIORITY_CONTROL;
 110                 cxgb3_ofld_send(ddp->tdev, skb);
 111         }
 112         return 0;
 113 }
 114
 115 static int clear_ddp_map(struct cxgb3i_ddp_info *ddp, unsigned int idx,
 116                          unsigned int npods)
 117 {
 118         unsigned int pm_addr = (idx << PPOD_SIZE_SHIFT) + ddp->llimit;
 119         int i;
 120
 121         for (i = 0; i < npods; i++, idx++, pm_addr += PPOD_SIZE) {
 122                 struct sk_buff *skb = ddp->gl_skb[idx];
 123
 124                 ddp->gl_skb[idx] = NULL;
 125                 memset((skb->head + sizeof(struct ulp_mem_io)), 0, PPOD_SIZE);
 126                 ulp_mem_io_set_hdr(skb, pm_addr);
 127                 skb->priority = CPL_PRIORITY_CONTROL;
 128                 cxgb3_ofld_send(ddp->tdev, skb);
 129         }
 130         return 0;
 131 }
 132
 133 static inline int ddp_find_unused_entries(struct cxgb3i_ddp_info *ddp,
 134                                           int start, int max, int count,
 135                                           struct cxgb3i_gather_list *gl)
 136 {
 137         unsigned int i, j;
 138
 139         spin_lock(&ddp->map_lock);
 140         for (i = start; i <= max;) {
 141                 for (j = 0; j < count; j++) {
 142                         if (ddp->gl_map[i + j])
 143                                 break;
 144                 }
 145                 if (j == count) {
 146                         for (j = 0; j < count; j++)
 147                                 ddp->gl_map[i + j] = gl;
 148                         spin_unlock(&ddp->map_lock);
 149                         return i;
 150                 }
 151                 i += j + 1;
 152         }
 153         spin_unlock(&ddp->map_lock);
 154         return -EBUSY;
 155 }
 156
 157 static inline void ddp_unmark_entries(struct cxgb3i_ddp_info *ddp,
 158                                       int start, int count)
 159 {
 160         spin_lock(&ddp->map_lock);
 161         memset(&ddp->gl_map[start], 0,
 162                count * sizeof(struct cxgb3i_gather_list *));
 163         spin_unlock(&ddp->map_lock);
 164 }
 165
 166 static inline void ddp_free_gl_skb(struct cxgb3i_ddp_info *ddp,
 167                                    int idx, int count)
 168 {
 169         int i;
 170
 171         for (i = 0; i < count; i++, idx++)
 172                 if (ddp->gl_skb[idx]) {
 173                         kfree_skb(ddp->gl_skb[idx]);
 174                         ddp->gl_skb[idx] = NULL;
 175                 }
 176 }
 177
 178 static inline int ddp_alloc_gl_skb(struct cxgb3i_ddp_info *ddp, int idx,
 179                                    int count, gfp_t gfp)
 180 {
 181         int i;
 182
 183         for (i = 0; i < count; i++) {
 184                 struct sk_buff *skb = alloc_skb(sizeof(struct ulp_mem_io) +
 185                                                 PPOD_SIZE, gfp);
 186                 if (skb) {
 187                         ddp->gl_skb[idx + i] = skb;
 188                         skb_put(skb, sizeof(struct ulp_mem_io) + PPOD_SIZE);
 189                 } else {
 190                         ddp_free_gl_skb(ddp, idx, i);
 191                         return -ENOMEM;
 192                 }
 193         }
 194         return 0;
 195 }
 196
 197 /**
 198  * cxgb3i_ddp_find_page_index - return ddp page index for a given page size.
 199  * @pgsz: page size
 200  * return the ddp page index, if no match is found return DDP_PGIDX_MAX.
 201  */
 202 int cxgb3i_ddp_find_page_index(unsigned long pgsz)
 203 {
 204         int i;
 205
 206         for (i = 0; i < DDP_PGIDX_MAX; i++) {
 207                 if (pgsz == (1UL << ddp_page_shift[i]))
 208                         return i;
 209         }
 210         ddp_log_debug("ddp page size 0x%lx not supported.\n", pgsz);
 211         return DDP_PGIDX_MAX;
 212 }
 213 EXPORT_SYMBOL_GPL(cxgb3i_ddp_find_page_index);
 214
 215 static inline void ddp_gl_unmap(struct pci_dev *pdev,
 216                                 struct cxgb3i_gather_list *gl)
 217 {
 218         int i;
 219
 220         for (i = 0; i < gl->nelem; i++)
 221                 pci_unmap_page(pdev, gl->phys_addr[i], PAGE_SIZE,
 222                                PCI_DMA_FROMDEVICE);
 223 }
 224
 225 static inline int ddp_gl_map(struct pci_dev *pdev,
 226                              struct cxgb3i_gather_list *gl)
 227 {
 228         int i;
 229
 230         for (i = 0; i < gl->nelem; i++) {
 231                 gl->phys_addr[i] = pci_map_page(pdev, gl->pages[i], 0,
 232                                                 PAGE_SIZE,
 233                                                 PCI_DMA_FROMDEVICE);
 234                 if (unlikely(pci_dma_mapping_error(pdev, gl->phys_addr[i])))
 235                         goto unmap;
 236         }
 237
 238         return i;
 239
 240 unmap:
 241         if (i) {
 242                 unsigned int nelem = gl->nelem;
 243
 244                 gl->nelem = i;
 245                 ddp_gl_unmap(pdev, gl);
 246                 gl->nelem = nelem;
 247         }
 248         return -ENOMEM;
 249 }
 250
 251 /**
 252  * cxgb3i_ddp_make_gl - build ddp page buffer list
 253  * @xferlen: total buffer length
 254  * @sgl: page buffer scatter-gather list
 255  * @sgcnt: # of page buffers
 256  * @pdev: pci_dev, used for pci map
 257  * @gfp: allocation mode
 258  *
 259  * construct a ddp page buffer list from the scsi scattergather list.
 260  * coalesce buffers as much as possible, and obtain dma addresses for
 261  * each page.
 262  *
 263  * Return the cxgb3i_gather_list constructed from the page buffers if the
 264  * memory can be used for ddp. Return NULL otherwise.
 265  */
 266 struct cxgb3i_gather_list *cxgb3i_ddp_make_gl(unsigned int xferlen,
 267                                               struct scatterlist *sgl,
 268                                               unsigned int sgcnt,
 269                                               struct pci_dev *pdev,
 270                                               gfp_t gfp)
 271 {
 272         struct cxgb3i_gather_list *gl;
 273         struct scatterlist *sg = sgl;
 274         struct page *sgpage = sg_page(sg);
 275         unsigned int sglen = sg->length;
 276         unsigned int sgoffset = sg->offset;
 277         unsigned int npages = (xferlen + sgoffset + PAGE_SIZE - 1) >>
 278                               PAGE_SHIFT;
 279         int i = 1, j = 0;
 280
 281         if (xferlen < DDP_THRESHOLD) {
 282                 ddp_log_debug("xfer %u < threshold %u, no ddp.\n",
 283                               xferlen, DDP_THRESHOLD);
 284                 return NULL;
 285         }
 286
 287         gl = kzalloc(sizeof(struct cxgb3i_gather_list) +
 288                      npages * (sizeof(dma_addr_t) + sizeof(struct page *)),
 289                      gfp);
 290         if (!gl)
 291                 return NULL;
 292
 293         gl->pages = (struct page **)&gl->phys_addr[npages];
 294         gl->length = xferlen;
 295         gl->offset = sgoffset;
 296         gl->pages[0] = sgpage;
 297
 298         sg = sg_next(sg);
 299         while (sg) {
 300                 struct page *page = sg_page(sg);
 301
 302                 if (sgpage == page && sg->offset == sgoffset + sglen)
 303                         sglen += sg->length;
 304                 else {
 305                         /* make sure the sgl is fit for ddp:
 306                          * each has the same page size, and
 307                          * all of the middle pages are used completely
 308                          */
 309                         if ((j && sgoffset) ||
 310                             ((i != sgcnt - 1) &&
 311                              ((sglen + sgoffset) & ~PAGE_MASK)))
 312                                 goto error_out;
 313
 314                         j++;
 315                         if (j == gl->nelem || sg->offset)
 316                                 goto error_out;
 317                         gl->pages[j] = page;
 318                         sglen = sg->length;
 319                         sgoffset = sg->offset;
 320                         sgpage = page;
 321                 }
 322                 i++;
 323                 sg = sg_next(sg);
 324         }
 325         gl->nelem = ++j;
 326
 327         if (ddp_gl_map(pdev, gl) < 0)
 328                 goto error_out;
 329
 330         return gl;
 331
 332 error_out:
 333         kfree(gl);
 334         return NULL;
 335 }
 336 EXPORT_SYMBOL_GPL(cxgb3i_ddp_make_gl);
 337
 338 /**
 339  * cxgb3i_ddp_release_gl - release a page buffer list
 340  * @gl: a ddp page buffer list
 341  * @pdev: pci_dev used for pci_unmap
 342  * free a ddp page buffer list resulted from cxgb3i_ddp_make_gl().
 343  */
 344 void cxgb3i_ddp_release_gl(struct cxgb3i_gather_list *gl,
 345                            struct pci_dev *pdev)
 346 {
 347         ddp_gl_unmap(pdev, gl);
 348         kfree(gl);
 349 }
 350 EXPORT_SYMBOL_GPL(cxgb3i_ddp_release_gl);
 351
 352 /**
 353  * cxgb3i_ddp_tag_reserve - set up ddp for a data transfer
 354  * @tdev: t3cdev adapter
 355  * @tid: connection id
 356  * @tformat: tag format
 357  * @tagp: the s/w tag, if ddp setup is successful, it will be updated with
 358  *        ddp/hw tag
 359  * @gl: the page momory list
 360  * @gfp: allocation mode
 361  *
 362  * ddp setup for a given page buffer list and construct the ddp tag.
 363  * return 0 if success, < 0 otherwise.
 364  */
 365 int cxgb3i_ddp_tag_reserve(struct t3cdev *tdev, unsigned int tid,
 366                            struct cxgb3i_tag_format *tformat, u32 *tagp,
 367                            struct cxgb3i_gather_list *gl, gfp_t gfp)
 368 {
 369         struct cxgb3i_ddp_info *ddp = tdev->ulp_iscsi;
 370         struct pagepod_hdr hdr;
 371         unsigned int npods;
 372         int idx = -1, idx_max;
 373         int err = -ENOMEM;
 374         u32 sw_tag = *tagp;
 375         u32 tag;
 376
 377         if (page_idx >= DDP_PGIDX_MAX || !ddp || !gl || !gl->nelem ||
 378                 gl->length < DDP_THRESHOLD) {
 379                 ddp_log_debug("pgidx %u, xfer %u/%u, NO ddp.\n",
 380                               page_idx, gl->length, DDP_THRESHOLD);
 381                 return -EINVAL;
 382         }
 383
 384         npods = (gl->nelem + PPOD_PAGES_MAX - 1) >> PPOD_PAGES_SHIFT;
 385         idx_max = ddp->nppods - npods + 1;
 386
 387         if (ddp->idx_last == ddp->nppods)
 388                 idx = ddp_find_unused_entries(ddp, 0, idx_max, npods, gl);
 389         else {
 390                 idx = ddp_find_unused_entries(ddp, ddp->idx_last + 1,
 391                                               idx_max, npods, gl);
 392                 if (idx < 0 && ddp->idx_last >= npods)
 393                         idx = ddp_find_unused_entries(ddp, 0,
 394                                                       ddp->idx_last - npods + 1,
 395                                                       npods, gl);
 396         }
 397         if (idx < 0) {
 398                 ddp_log_debug("xferlen %u, gl %u, npods %u NO DDP.\n",
 399                               gl->length, gl->nelem, npods);
 400                 return idx;
 401         }
 402
 403         err = ddp_alloc_gl_skb(ddp, idx, npods, gfp);
 404         if (err < 0)
 405                 goto unmark_entries;
 406
 407         tag = cxgb3i_ddp_tag_base(tformat, sw_tag);
 408         tag |= idx << PPOD_IDX_SHIFT;
 409
 410         hdr.rsvd = 0;
 411         hdr.vld_tid = htonl(F_PPOD_VALID | V_PPOD_TID(tid));
 412         hdr.pgsz_tag_clr = htonl(tag & ddp->rsvd_tag_mask);
 413         hdr.maxoffset = htonl(gl->length);
 414         hdr.pgoffset = htonl(gl->offset);
 415
 416         err = set_ddp_map(ddp, &hdr, idx, npods, gl);
 417         if (err < 0)
 418                 goto free_gl_skb;
 419
 420         ddp->idx_last = idx;
 421         ddp_log_debug("xfer %u, gl %u,%u, tid 0x%x, 0x%x -> 0x%x(%u,%u).\n",
 422                       gl->length, gl->nelem, gl->offset, tid, sw_tag, tag,
 423                       idx, npods);
 424         *tagp = tag;
 425         return 0;
 426
 427 free_gl_skb:
 428         ddp_free_gl_skb(ddp, idx, npods);
 429 unmark_entries:
 430         ddp_unmark_entries(ddp, idx, npods);
 431         return err;
 432 }
 433 EXPORT_SYMBOL_GPL(cxgb3i_ddp_tag_reserve);
 434
 435 /**
 436  * cxgb3i_ddp_tag_release - release a ddp tag
 437  * @tdev: t3cdev adapter
 438  * @tag: ddp tag
 439  * ddp cleanup for a given ddp tag and release all the resources held
 440  */
 441 void cxgb3i_ddp_tag_release(struct t3cdev *tdev, u32 tag)
 442 {
 443         struct cxgb3i_ddp_info *ddp = tdev->ulp_iscsi;
 444         u32 idx;
 445
 446         if (!ddp) {
 447                 ddp_log_error("release ddp tag 0x%x, ddp NULL.\n", tag);
 448                 return;
 449         }
 450
 451         idx = (tag >> PPOD_IDX_SHIFT) & ddp->idx_mask;
 452         if (idx < ddp->nppods) {
 453                 struct cxgb3i_gather_list *gl = ddp->gl_map[idx];
 454                 unsigned int npods;
 455
 456                 if (!gl) {
 457                         ddp_log_error("release ddp 0x%x, idx 0x%x, gl NULL.\n",
 458                                       tag, idx);
 459                         return;
 460                 }
 461                 npods = (gl->nelem + PPOD_PAGES_MAX - 1) >> PPOD_PAGES_SHIFT;
 462                 ddp_log_debug("ddp tag 0x%x, release idx 0x%x, npods %u.\n",
 463                               tag, idx, npods);
 464                 clear_ddp_map(ddp, idx, npods);
 465                 ddp_unmark_entries(ddp, idx, npods);
 466                 cxgb3i_ddp_release_gl(gl, ddp->pdev);
 467         } else
 468                 ddp_log_error("ddp tag 0x%x, idx 0x%x > max 0x%x.\n",
 469                               tag, idx, ddp->nppods);
 470 }
 471 EXPORT_SYMBOL_GPL(cxgb3i_ddp_tag_release);
 472
 473 static int setup_conn_pgidx(struct t3cdev *tdev, unsigned int tid, int pg_idx,
 474                             int reply)
 475 {
 476         struct sk_buff *skb = alloc_skb(sizeof(struct cpl_set_tcb_field),
 477                                         GFP_KERNEL);
 478         struct cpl_set_tcb_field *req;
 479         u64 val = pg_idx < DDP_PGIDX_MAX ? pg_idx : 0;
 480
 481         if (!skb)
 482                 return -ENOMEM;
 483
 484         /* set up ulp submode and page size */
 485         req = (struct cpl_set_tcb_field *)skb_put(skb, sizeof(*req));
 486         req->wr.wr_hi = htonl(V_WR_OP(FW_WROPCODE_FORWARD));
 487         OPCODE_TID(req) = htonl(MK_OPCODE_TID(CPL_SET_TCB_FIELD, tid));
 488         req->reply = V_NO_REPLY(reply ? 0 : 1);
 489         req->cpu_idx = 0;
 490         req->word = htons(31);
 491         req->mask = cpu_to_be64(0xF0000000);
 492         req->val = cpu_to_be64(val << 28);
 493         skb->priority = CPL_PRIORITY_CONTROL;
 494
 495         cxgb3_ofld_send(tdev, skb);
 496         return 0;
 497 }
 498
 499 /**
 500  * cxgb3i_setup_conn_host_pagesize - setup the conn.'s ddp page size
 501  * @tdev: t3cdev adapter
 502  * @tid: connection id
 503  * @reply: request reply from h/w
 504  * set up the ddp page size based on the host PAGE_SIZE for a connection
 505  * identified by tid
 506  */
 507 int cxgb3i_setup_conn_host_pagesize(struct t3cdev *tdev, unsigned int tid,
 508                                     int reply)
 509 {
 510         return setup_conn_pgidx(tdev, tid, page_idx, reply);
 511 }
 512 EXPORT_SYMBOL_GPL(cxgb3i_setup_conn_host_pagesize);
 513
 514 /**
 515  * cxgb3i_setup_conn_pagesize - setup the conn.'s ddp page size
 516  * @tdev: t3cdev adapter
 517  * @tid: connection id
 518  * @reply: request reply from h/w
 519  * @pgsz: ddp page size
 520  * set up the ddp page size for a connection identified by tid
 521  */
 522 int cxgb3i_setup_conn_pagesize(struct t3cdev *tdev, unsigned int tid,
 523                                 int reply, unsigned long pgsz)
 524 {
 525         int pgidx = cxgb3i_ddp_find_page_index(pgsz);
 526
 527         return setup_conn_pgidx(tdev, tid, pgidx, reply);
 528 }
 529 EXPORT_SYMBOL_GPL(cxgb3i_setup_conn_pagesize);
 530
 531 /**
 532  * cxgb3i_setup_conn_digest - setup conn. digest setting
 533  * @tdev: t3cdev adapter
 534  * @tid: connection id
 535  * @hcrc: header digest enabled
 536  * @dcrc: data digest enabled
 537  * @reply: request reply from h/w
 538  * set up the iscsi digest settings for a connection identified by tid
 539  */
 540 int cxgb3i_setup_conn_digest(struct t3cdev *tdev, unsigned int tid,
 541                              int hcrc, int dcrc, int reply)
 542 {
 543         struct sk_buff *skb = alloc_skb(sizeof(struct cpl_set_tcb_field),
 544                                         GFP_KERNEL);
 545         struct cpl_set_tcb_field *req;
 546         u64 val = (hcrc ? 1 : 0) | (dcrc ? 2 : 0);
 547
 548         if (!skb)
 549                 return -ENOMEM;
 550
 551         /* set up ulp submode and page size */
 552         req = (struct cpl_set_tcb_field *)skb_put(skb, sizeof(*req));
 553         req->wr.wr_hi = htonl(V_WR_OP(FW_WROPCODE_FORWARD));
 554         OPCODE_TID(req) = htonl(MK_OPCODE_TID(CPL_SET_TCB_FIELD, tid));
 555         req->reply = V_NO_REPLY(reply ? 0 : 1);
 556         req->cpu_idx = 0;
 557         req->word = htons(31);
 558         req->mask = cpu_to_be64(0x0F000000);
 559         req->val = cpu_to_be64(val << 24);
 560         skb->priority = CPL_PRIORITY_CONTROL;
 561
 562         cxgb3_ofld_send(tdev, skb);
 563         return 0;
 564 }
 565 EXPORT_SYMBOL_GPL(cxgb3i_setup_conn_digest);
 566
 567 static int ddp_init(struct t3cdev *tdev)
 568 {
 569         struct cxgb3i_ddp_info *ddp;
 570         struct ulp_iscsi_info uinfo;
 571         unsigned int ppmax, bits;
 572         int i, err;
 573         static int vers_printed;
 574
 575         if (!vers_printed) {
 576                 printk(KERN_INFO "%s", version);
 577                 vers_printed = 1;
 578         }
 579
 580         err = tdev->ctl(tdev, ULP_ISCSI_GET_PARAMS, &uinfo);
 581         if (err < 0) {
 582                 ddp_log_error("%s, failed to get iscsi param err=%d.\n",
 583                                  tdev->name, err);
 584                 return err;
 585         }
 586
 587         ppmax = (uinfo.ulimit - uinfo.llimit + 1) >> PPOD_SIZE_SHIFT;
 588         bits = __ilog2_u32(ppmax) + 1;
 589         if (bits > PPOD_IDX_MAX_SIZE)
 590                 bits = PPOD_IDX_MAX_SIZE;
 591         ppmax = (1 << (bits - 1)) - 1;
 592
 593         ddp = cxgb3i_alloc_big_mem(sizeof(struct cxgb3i_ddp_info) +
 594                                    ppmax *
 595                                         (sizeof(struct cxgb3i_gather_list *) +
 596                                         sizeof(struct sk_buff *)),
 597                                    GFP_KERNEL);
 598         if (!ddp) {
 599                 ddp_log_warn("%s unable to alloc ddp 0x%d, ddp disabled.\n",
 600                              tdev->name, ppmax);
 601                 return 0;
 602         }
 603         ddp->gl_map = (struct cxgb3i_gather_list **)(ddp + 1);
 604         ddp->gl_skb = (struct sk_buff **)(((char *)ddp->gl_map) +
 605                                           ppmax *
 606                                           sizeof(struct cxgb3i_gather_list *));
 607         spin_lock_init(&ddp->map_lock);
 608
 609         ddp->tdev = tdev;
 610         ddp->pdev = uinfo.pdev;
 611         ddp->max_txsz = min_t(unsigned int, uinfo.max_txsz, ULP2_MAX_PKT_SIZE);
 612         ddp->max_rxsz = min_t(unsigned int, uinfo.max_rxsz, ULP2_MAX_PKT_SIZE);
 613         ddp->llimit = uinfo.llimit;
 614         ddp->ulimit = uinfo.ulimit;
 615         ddp->nppods = ppmax;
 616         ddp->idx_last = ppmax;
 617         ddp->idx_bits = bits;
 618         ddp->idx_mask = (1 << bits) - 1;
 619         ddp->rsvd_tag_mask = (1 << (bits + PPOD_IDX_SHIFT)) - 1;
 620
 621         uinfo.tagmask = ddp->idx_mask << PPOD_IDX_SHIFT;
 622         for (i = 0; i < DDP_PGIDX_MAX; i++)
 623                 uinfo.pgsz_factor[i] = ddp_page_order[i];
 624         uinfo.ulimit = uinfo.llimit + (ppmax << PPOD_SIZE_SHIFT);
 625
 626         err = tdev->ctl(tdev, ULP_ISCSI_SET_PARAMS, &uinfo);
 627         if (err < 0) {
 628                 ddp_log_warn("%s unable to set iscsi param err=%d, "
 629                               "ddp disabled.\n", tdev->name, err);
 630                 goto free_ddp_map;
 631         }
 632
 633         tdev->ulp_iscsi = ddp;
 634
 635         /* add to the list */
 636         write_lock(&cxgb3i_ddp_rwlock);
 637         list_add_tail(&ddp->list, &cxgb3i_ddp_list);
 638         write_unlock(&cxgb3i_ddp_rwlock);
 639
 640         ddp_log_info("nppods %u (0x%x ~ 0x%x), bits %u, mask 0x%x,0x%x "
 641                         "pkt %u,%u.\n",
 642                         ppmax, ddp->llimit, ddp->ulimit, ddp->idx_bits,
 643                         ddp->idx_mask, ddp->rsvd_tag_mask,
 644                         ddp->max_txsz, ddp->max_rxsz);
 645         return 0;
 646
 647 free_ddp_map:
 648         cxgb3i_free_big_mem(ddp);
 649         return err;
 650 }
 651
 652 /**
 653  * cxgb3i_adapter_ddp_init - initialize the adapter's ddp resource
 654  * @tdev: t3cdev adapter
 655  * @tformat: tag format
 656  * @txsz: max tx pkt size, filled in by this func.
 657  * @rxsz: max rx pkt size, filled in by this func.
 658  * initialize the ddp pagepod manager for a given adapter if needed and
 659  * setup the tag format for a given iscsi entity
 660  */
 661 int cxgb3i_adapter_ddp_init(struct t3cdev *tdev,
 662                             struct cxgb3i_tag_format *tformat,
 663                             unsigned int *txsz, unsigned int *rxsz)
 664 {
 665         struct cxgb3i_ddp_info *ddp;
 666         unsigned char idx_bits;
 667
 668         if (!tformat)
 669                 return -EINVAL;
 670
 671         if (!tdev->ulp_iscsi) {
 672                 int err = ddp_init(tdev);
 673                 if (err < 0)
 674                         return err;
 675         }
 676         ddp = (struct cxgb3i_ddp_info *)tdev->ulp_iscsi;
 677
 678         idx_bits = 32 - tformat->sw_bits;
 679         tformat->rsvd_bits = ddp->idx_bits;
 680         tformat->rsvd_shift = PPOD_IDX_SHIFT;
 681         tformat->rsvd_mask = (1 << tformat->rsvd_bits) - 1;
 682
 683         ddp_log_info("tag format: sw %u, rsvd %u,%u, mask 0x%x.\n",
 684                       tformat->sw_bits, tformat->rsvd_bits,
 685                       tformat->rsvd_shift, tformat->rsvd_mask);
 686
 687         *txsz = ddp->max_txsz;
 688         *rxsz = ddp->max_rxsz;
 689         ddp_log_info("ddp max pkt size: %u, %u.\n",
 690                      ddp->max_txsz, ddp->max_rxsz);
 691         return 0;
 692 }
 693 EXPORT_SYMBOL_GPL(cxgb3i_adapter_ddp_init);
 694
 695 static void ddp_release(struct cxgb3i_ddp_info *ddp)
 696 {
 697         int i = 0;
 698         struct t3cdev *tdev = ddp->tdev;
 699
 700         tdev->ulp_iscsi = NULL;
 701         while (i < ddp->nppods) {
 702                 struct cxgb3i_gather_list *gl = ddp->gl_map[i];
 703                 if (gl) {
 704                         int npods = (gl->nelem + PPOD_PAGES_MAX - 1)
 705                                      >> PPOD_PAGES_SHIFT;
 706
 707                         kfree(gl);
 708                         ddp_free_gl_skb(ddp, i, npods);
 709                 } else
 710                         i++;
 711         }
 712         cxgb3i_free_big_mem(ddp);
 713 }
 714
 715 /**
 716  * cxgb3i_adapter_ddp_cleanup - release the adapter's ddp resource
 717  * @tdev: t3cdev adapter
 718  * release all the resource held by the ddp pagepod manager for a given
 719  * adapter if needed
 720  */
 721 void cxgb3i_adapter_ddp_cleanup(struct t3cdev *tdev)
 722 {
 723         struct cxgb3i_ddp_info *ddp;
 724
 725         /* remove from the list */
 726         write_lock(&cxgb3i_ddp_rwlock);
 727         list_for_each_entry(ddp, &cxgb3i_ddp_list, list) {
 728                 if (ddp->tdev == tdev) {
 729                         list_del(&ddp->list);
 730                         break;
 731                 }
 732         }
 733         write_unlock(&cxgb3i_ddp_rwlock);
 734
 735         if (ddp)
 736                 ddp_release(ddp);
 737 }
 738 EXPORT_SYMBOL_GPL(cxgb3i_adapter_ddp_cleanup);
 739
 740 /**
 741  * cxgb3i_ddp_init_module - module init entry point
 742  * initialize any driver wide global data structures
 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         return 0;
 750 }
 751
 752 /**
 753  * cxgb3i_ddp_exit_module - module cleanup/exit entry point
 754  * go through the ddp list and release any resource held.
 755  */
 756 static void __exit cxgb3i_ddp_exit_module(void)
 757 {
 758         struct cxgb3i_ddp_info *ddp;
 759
 760         /* release all ddp manager if there is any */
 761         write_lock(&cxgb3i_ddp_rwlock);
 762         list_for_each_entry(ddp, &cxgb3i_ddp_list, list) {
 763                 list_del(&ddp->list);
 764                 ddp_release(ddp);
 765         }
 766         write_unlock(&cxgb3i_ddp_rwlock);
 767 }
 768
 769 module_init(cxgb3i_ddp_init_module);
 770 module_exit(cxgb3i_ddp_exit_module);