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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 #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                                           unsigned int start, unsigned int max,
 124                                           unsigned int count,
 125                                           struct cxgb3i_gather_list *gl)
 126 {
 127         unsigned int i, j, k;
 128
 129         /* not enough entries */
 130         if ((max - start) < count)
 131                 return -EBUSY;
 132
 133         max -= count;
 134         spin_lock(&ddp->map_lock);
 135         for (i = start; i < max;) {
 136                 for (j = 0, k = i; j < count; j++, k++) {
 137                         if (ddp->gl_map[k])
 138                                 break;
 139                 }
 140                 if (j == count) {
 141                         for (j = 0, k = i; j < count; j++, k++)
 142                                 ddp->gl_map[k] = gl;
 143                         spin_unlock(&ddp->map_lock);
 144                         return i;
 145                 }
 146                 i += j + 1;
 147         }
 148         spin_unlock(&ddp->map_lock);
 149         return -EBUSY;
 150 }
 151
 152 static inline void ddp_unmark_entries(struct cxgb3i_ddp_info *ddp,
 153                                       int start, int count)
 154 {
 155         spin_lock(&ddp->map_lock);
 156         memset(&ddp->gl_map[start], 0,
 157                count * sizeof(struct cxgb3i_gather_list *));
 158         spin_unlock(&ddp->map_lock);
 159 }
 160
 161 static inline void ddp_free_gl_skb(struct cxgb3i_ddp_info *ddp,
 162                                    int idx, int count)
 163 {
 164         int i;
 165
 166         for (i = 0; i < count; i++, idx++)
 167                 if (ddp->gl_skb[idx]) {
 168                         kfree_skb(ddp->gl_skb[idx]);
 169                         ddp->gl_skb[idx] = NULL;
 170                 }
 171 }
 172
 173 static inline int ddp_alloc_gl_skb(struct cxgb3i_ddp_info *ddp, int idx,
 174                                    int count, gfp_t gfp)
 175 {
 176         int i;
 177
 178         for (i = 0; i < count; i++) {
 179                 struct sk_buff *skb = alloc_skb(sizeof(struct ulp_mem_io) +
 180                                                 PPOD_SIZE, gfp);
 181                 if (skb) {
 182                         ddp->gl_skb[idx + i] = skb;
 183                         skb_put(skb, sizeof(struct ulp_mem_io) + PPOD_SIZE);
 184                 } else {
 185                         ddp_free_gl_skb(ddp, idx, i);
 186                         return -ENOMEM;
 187                 }
 188         }
 189         return 0;
 190 }
 191
 192 /**
 193  * cxgb3i_ddp_find_page_index - return ddp page index for a given page size
 194  * @pgsz: page size
 195  * return the ddp page index, if no match is found return DDP_PGIDX_MAX.
 196  */
 197 int cxgb3i_ddp_find_page_index(unsigned long pgsz)
 198 {
 199         int i;
 200
 201         for (i = 0; i < DDP_PGIDX_MAX; i++) {
 202                 if (pgsz == (1UL << ddp_page_shift[i]))
 203                         return i;
 204         }
 205         ddp_log_debug("ddp page size 0x%lx not supported.\n", pgsz);
 206         return DDP_PGIDX_MAX;
 207 }
 208
 209 /**
 210  * cxgb3i_ddp_adjust_page_table - adjust page table with PAGE_SIZE
 211  * return the ddp page index, if no match is found return DDP_PGIDX_MAX.
 212  */
 213 int cxgb3i_ddp_adjust_page_table(void)
 214 {
 215         int i;
 216         unsigned int base_order, order;
 217
 218         if (PAGE_SIZE < (1UL << ddp_page_shift[0])) {
 219                 ddp_log_info("PAGE_SIZE 0x%lx too small, min. 0x%lx.\n",
 220                                 PAGE_SIZE, 1UL << ddp_page_shift[0]);
 221                 return -EINVAL;
 222         }
 223
 224         base_order = get_order(1UL << ddp_page_shift[0]);
 225         order = get_order(1 << PAGE_SHIFT);
 226         for (i = 0; i < DDP_PGIDX_MAX; i++) {
 227                 /* first is the kernel page size, then just doubling the size */
 228                 ddp_page_order[i] = order - base_order + i;
 229                 ddp_page_shift[i] = PAGE_SHIFT + i;
 230         }
 231         return 0;
 232 }
 233
 234 static inline void ddp_gl_unmap(struct pci_dev *pdev,
 235                                 struct cxgb3i_gather_list *gl)
 236 {
 237         int i;
 238
 239         for (i = 0; i < gl->nelem; i++)
 240                 pci_unmap_page(pdev, gl->phys_addr[i], PAGE_SIZE,
 241                                PCI_DMA_FROMDEVICE);
 242 }
 243
 244 static inline int ddp_gl_map(struct pci_dev *pdev,
 245                              struct cxgb3i_gather_list *gl)
 246 {
 247         int i;
 248
 249         for (i = 0; i < gl->nelem; i++) {
 250                 gl->phys_addr[i] = pci_map_page(pdev, gl->pages[i], 0,
 251                                                 PAGE_SIZE,
 252                                                 PCI_DMA_FROMDEVICE);
 253                 if (unlikely(pci_dma_mapping_error(pdev, gl->phys_addr[i])))
 254                         goto unmap;
 255         }
 256
 257         return i;
 258
 259 unmap:
 260         if (i) {
 261                 unsigned int nelem = gl->nelem;
 262
 263                 gl->nelem = i;
 264                 ddp_gl_unmap(pdev, gl);
 265                 gl->nelem = nelem;
 266         }
 267         return -ENOMEM;
 268 }
 269
 270 /**
 271  * cxgb3i_ddp_make_gl - build ddp page buffer list
 272  * @xferlen: total buffer length
 273  * @sgl: page buffer scatter-gather list
 274  * @sgcnt: # of page buffers
 275  * @pdev: pci_dev, used for pci map
 276  * @gfp: allocation mode
 277  *
 278  * construct a ddp page buffer list from the scsi scattergather list.
 279  * coalesce buffers as much as possible, and obtain dma addresses for
 280  * each page.
 281  *
 282  * Return the cxgb3i_gather_list constructed from the page buffers if the
 283  * memory can be used for ddp. Return NULL otherwise.
 284  */
 285 struct cxgb3i_gather_list *cxgb3i_ddp_make_gl(unsigned int xferlen,
 286                                               struct scatterlist *sgl,
 287                                               unsigned int sgcnt,
 288                                               struct pci_dev *pdev,
 289                                               gfp_t gfp)
 290 {
 291         struct cxgb3i_gather_list *gl;
 292         struct scatterlist *sg = sgl;
 293         struct page *sgpage = sg_page(sg);
 294         unsigned int sglen = sg->length;
 295         unsigned int sgoffset = sg->offset;
 296         unsigned int npages = (xferlen + sgoffset + PAGE_SIZE - 1) >>
 297                               PAGE_SHIFT;
 298         int i = 1, j = 0;
 299
 300         if (xferlen < DDP_THRESHOLD) {
 301                 ddp_log_debug("xfer %u < threshold %u, no ddp.\n",
 302                               xferlen, DDP_THRESHOLD);
 303                 return NULL;
 304         }
 305
 306         gl = kzalloc(sizeof(struct cxgb3i_gather_list) +
 307                      npages * (sizeof(dma_addr_t) + sizeof(struct page *)),
 308                      gfp);
 309         if (!gl)
 310                 return NULL;
 311
 312         gl->pages = (struct page **)&gl->phys_addr[npages];
 313         gl->length = xferlen;
 314         gl->offset = sgoffset;
 315         gl->pages[0] = sgpage;
 316
 317         sg = sg_next(sg);
 318         while (sg) {
 319                 struct page *page = sg_page(sg);
 320
 321                 if (sgpage == page && sg->offset == sgoffset + sglen)
 322                         sglen += sg->length;
 323                 else {
 324                         /* make sure the sgl is fit for ddp:
 325                          * each has the same page size, and
 326                          * all of the middle pages are used completely
 327                          */
 328                         if ((j && sgoffset) ||
 329                             ((i != sgcnt - 1) &&
 330                              ((sglen + sgoffset) & ~PAGE_MASK)))
 331                                 goto error_out;
 332
 333                         j++;
 334                         if (j == gl->nelem || sg->offset)
 335                                 goto error_out;
 336                         gl->pages[j] = page;
 337                         sglen = sg->length;
 338                         sgoffset = sg->offset;
 339                         sgpage = page;
 340                 }
 341                 i++;
 342                 sg = sg_next(sg);
 343         }
 344         gl->nelem = ++j;
 345
 346         if (ddp_gl_map(pdev, gl) < 0)
 347                 goto error_out;
 348
 349         return gl;
 350
 351 error_out:
 352         kfree(gl);
 353         return NULL;
 354 }
 355
 356 /**
 357  * cxgb3i_ddp_release_gl - release a page buffer list
 358  * @gl: a ddp page buffer list
 359  * @pdev: pci_dev used for pci_unmap
 360  * free a ddp page buffer list resulted from cxgb3i_ddp_make_gl().
 361  */
 362 void cxgb3i_ddp_release_gl(struct cxgb3i_gather_list *gl,
 363                            struct pci_dev *pdev)
 364 {
 365         ddp_gl_unmap(pdev, gl);
 366         kfree(gl);
 367 }
 368
 369 /**
 370  * cxgb3i_ddp_tag_reserve - set up ddp for a data transfer
 371  * @tdev: t3cdev adapter
 372  * @tid: connection id
 373  * @tformat: tag format
 374  * @tagp: contains s/w tag initially, will be updated with ddp/hw tag
 375  * @gl: the page momory list
 376  * @gfp: allocation mode
 377  *
 378  * ddp setup for a given page buffer list and construct the ddp tag.
 379  * return 0 if success, < 0 otherwise.
 380  */
 381 int cxgb3i_ddp_tag_reserve(struct t3cdev *tdev, unsigned int tid,
 382                            struct cxgb3i_tag_format *tformat, u32 *tagp,
 383                            struct cxgb3i_gather_list *gl, gfp_t gfp)
 384 {
 385         struct cxgb3i_ddp_info *ddp = tdev->ulp_iscsi;
 386         struct pagepod_hdr hdr;
 387         unsigned int npods;
 388         int idx = -1;
 389         int err = -ENOMEM;
 390         u32 sw_tag = *tagp;
 391         u32 tag;
 392
 393         if (page_idx >= DDP_PGIDX_MAX || !ddp || !gl || !gl->nelem ||
 394                 gl->length < DDP_THRESHOLD) {
 395                 ddp_log_debug("pgidx %u, xfer %u/%u, NO ddp.\n",
 396                               page_idx, gl->length, DDP_THRESHOLD);
 397                 return -EINVAL;
 398         }
 399
 400         npods = (gl->nelem + PPOD_PAGES_MAX - 1) >> PPOD_PAGES_SHIFT;
 401
 402         if (ddp->idx_last == ddp->nppods)
 403                 idx = ddp_find_unused_entries(ddp, 0, ddp->nppods, npods, gl);
 404         else {
 405                 idx = ddp_find_unused_entries(ddp, ddp->idx_last + 1,
 406                                               ddp->nppods, npods, gl);
 407                 if (idx < 0 && ddp->idx_last >= npods) {
 408                         idx = ddp_find_unused_entries(ddp, 0,
 409                                 min(ddp->idx_last + npods, ddp->nppods),
 410                                                       npods, gl);
 411                 }
 412         }
 413         if (idx < 0) {
 414                 ddp_log_debug("xferlen %u, gl %u, npods %u NO DDP.\n",
 415                               gl->length, gl->nelem, npods);
 416                 return idx;
 417         }
 418
 419         err = ddp_alloc_gl_skb(ddp, idx, npods, gfp);
 420         if (err < 0)
 421                 goto unmark_entries;
 422
 423         tag = cxgb3i_ddp_tag_base(tformat, sw_tag);
 424         tag |= idx << PPOD_IDX_SHIFT;
 425
 426         hdr.rsvd = 0;
 427         hdr.vld_tid = htonl(F_PPOD_VALID | V_PPOD_TID(tid));
 428         hdr.pgsz_tag_clr = htonl(tag & ddp->rsvd_tag_mask);
 429         hdr.maxoffset = htonl(gl->length);
 430         hdr.pgoffset = htonl(gl->offset);
 431
 432         err = set_ddp_map(ddp, &hdr, idx, npods, gl);
 433         if (err < 0)
 434                 goto free_gl_skb;
 435
 436         ddp->idx_last = idx;
 437         ddp_log_debug("xfer %u, gl %u,%u, tid 0x%x, 0x%x -> 0x%x(%u,%u).\n",
 438                       gl->length, gl->nelem, gl->offset, tid, sw_tag, tag,
 439                       idx, npods);
 440         *tagp = tag;
 441         return 0;
 442
 443 free_gl_skb:
 444         ddp_free_gl_skb(ddp, idx, npods);
 445 unmark_entries:
 446         ddp_unmark_entries(ddp, idx, npods);
 447         return err;
 448 }
 449
 450 /**
 451  * cxgb3i_ddp_tag_release - release a ddp tag
 452  * @tdev: t3cdev adapter
 453  * @tag: ddp tag
 454  * ddp cleanup for a given ddp tag and release all the resources held
 455  */
 456 void cxgb3i_ddp_tag_release(struct t3cdev *tdev, u32 tag)
 457 {
 458         struct cxgb3i_ddp_info *ddp = tdev->ulp_iscsi;
 459         u32 idx;
 460
 461         if (!ddp) {
 462                 ddp_log_error("release ddp tag 0x%x, ddp NULL.\n", tag);
 463                 return;
 464         }
 465
 466         idx = (tag >> PPOD_IDX_SHIFT) & ddp->idx_mask;
 467         if (idx < ddp->nppods) {
 468                 struct cxgb3i_gather_list *gl = ddp->gl_map[idx];
 469                 unsigned int npods;
 470
 471                 if (!gl || !gl->nelem) {
 472                         ddp_log_error("release 0x%x, idx 0x%x, gl 0x%p, %u.\n",
 473                                       tag, idx, gl, gl ? gl->nelem : 0);
 474                         return;
 475                 }
 476                 npods = (gl->nelem + PPOD_PAGES_MAX - 1) >> PPOD_PAGES_SHIFT;
 477                 ddp_log_debug("ddp tag 0x%x, release idx 0x%x, npods %u.\n",
 478                               tag, idx, npods);
 479                 clear_ddp_map(ddp, tag, idx, npods);
 480                 ddp_unmark_entries(ddp, idx, npods);
 481                 cxgb3i_ddp_release_gl(gl, ddp->pdev);
 482         } else
 483                 ddp_log_error("ddp tag 0x%x, idx 0x%x > max 0x%x.\n",
 484                               tag, idx, ddp->nppods);
 485 }
 486
 487 static int setup_conn_pgidx(struct t3cdev *tdev, unsigned int tid, int pg_idx,
 488                             int reply)
 489 {
 490         struct sk_buff *skb = alloc_skb(sizeof(struct cpl_set_tcb_field),
 491                                         GFP_KERNEL);
 492         struct cpl_set_tcb_field *req;
 493         u64 val = pg_idx < DDP_PGIDX_MAX ? pg_idx : 0;
 494
 495         if (!skb)
 496                 return -ENOMEM;
 497
 498         /* set up ulp submode and page size */
 499         req = (struct cpl_set_tcb_field *)skb_put(skb, sizeof(*req));
 500         req->wr.wr_hi = htonl(V_WR_OP(FW_WROPCODE_FORWARD));
 501         OPCODE_TID(req) = htonl(MK_OPCODE_TID(CPL_SET_TCB_FIELD, tid));
 502         req->reply = V_NO_REPLY(reply ? 0 : 1);
 503         req->cpu_idx = 0;
 504         req->word = htons(31);
 505         req->mask = cpu_to_be64(0xF0000000);
 506         req->val = cpu_to_be64(val << 28);
 507         skb->priority = CPL_PRIORITY_CONTROL;
 508
 509         cxgb3_ofld_send(tdev, skb);
 510         return 0;
 511 }
 512
 513 /**
 514  * cxgb3i_setup_conn_host_pagesize - setup the conn.'s ddp page size
 515  * @tdev: t3cdev adapter
 516  * @tid: connection id
 517  * @reply: request reply from h/w
 518  * set up the ddp page size based on the host PAGE_SIZE for a connection
 519  * identified by tid
 520  */
 521 int cxgb3i_setup_conn_host_pagesize(struct t3cdev *tdev, unsigned int tid,
 522                                     int reply)
 523 {
 524         return setup_conn_pgidx(tdev, tid, page_idx, reply);
 525 }
 526
 527 /**
 528  * cxgb3i_setup_conn_pagesize - setup the conn.'s ddp page size
 529  * @tdev: t3cdev adapter
 530  * @tid: connection id
 531  * @reply: request reply from h/w
 532  * @pgsz: ddp page size
 533  * set up the ddp page size for a connection identified by tid
 534  */
 535 int cxgb3i_setup_conn_pagesize(struct t3cdev *tdev, unsigned int tid,
 536                                 int reply, unsigned long pgsz)
 537 {
 538         int pgidx = cxgb3i_ddp_find_page_index(pgsz);
 539
 540         return setup_conn_pgidx(tdev, tid, pgidx, reply);
 541 }
 542
 543 /**
 544  * cxgb3i_setup_conn_digest - setup conn. digest setting
 545  * @tdev: t3cdev adapter
 546  * @tid: connection id
 547  * @hcrc: header digest enabled
 548  * @dcrc: data digest enabled
 549  * @reply: request reply from h/w
 550  * set up the iscsi digest settings for a connection identified by tid
 551  */
 552 int cxgb3i_setup_conn_digest(struct t3cdev *tdev, unsigned int tid,
 553                              int hcrc, int dcrc, int reply)
 554 {
 555         struct sk_buff *skb = alloc_skb(sizeof(struct cpl_set_tcb_field),
 556                                         GFP_KERNEL);
 557         struct cpl_set_tcb_field *req;
 558         u64 val = (hcrc ? 1 : 0) | (dcrc ? 2 : 0);
 559
 560         if (!skb)
 561                 return -ENOMEM;
 562
 563         /* set up ulp submode and page size */
 564         req = (struct cpl_set_tcb_field *)skb_put(skb, sizeof(*req));
 565         req->wr.wr_hi = htonl(V_WR_OP(FW_WROPCODE_FORWARD));
 566         OPCODE_TID(req) = htonl(MK_OPCODE_TID(CPL_SET_TCB_FIELD, tid));
 567         req->reply = V_NO_REPLY(reply ? 0 : 1);
 568         req->cpu_idx = 0;
 569         req->word = htons(31);
 570         req->mask = cpu_to_be64(0x0F000000);
 571         req->val = cpu_to_be64(val << 24);
 572         skb->priority = CPL_PRIORITY_CONTROL;
 573
 574         cxgb3_ofld_send(tdev, skb);
 575         return 0;
 576 }
 577
 578
 579 /**
 580  * cxgb3i_adapter_ddp_info - read the adapter's ddp information
 581  * @tdev: t3cdev adapter
 582  * @tformat: tag format
 583  * @txsz: max tx pdu payload size, filled in by this func.
 584  * @rxsz: max rx pdu payload size, filled in by this func.
 585  * setup the tag format for a given iscsi entity
 586  */
 587 int cxgb3i_adapter_ddp_info(struct t3cdev *tdev,
 588                             struct cxgb3i_tag_format *tformat,
 589                             unsigned int *txsz, unsigned int *rxsz)
 590 {
 591         struct cxgb3i_ddp_info *ddp;
 592         unsigned char idx_bits;
 593
 594         if (!tformat)
 595                 return -EINVAL;
 596
 597         if (!tdev->ulp_iscsi)
 598                 return -EINVAL;
 599
 600         ddp = (struct cxgb3i_ddp_info *)tdev->ulp_iscsi;
 601
 602         idx_bits = 32 - tformat->sw_bits;
 603         tformat->rsvd_bits = ddp->idx_bits;
 604         tformat->rsvd_shift = PPOD_IDX_SHIFT;
 605         tformat->rsvd_mask = (1 << tformat->rsvd_bits) - 1;
 606
 607         ddp_log_info("tag format: sw %u, rsvd %u,%u, mask 0x%x.\n",
 608                       tformat->sw_bits, tformat->rsvd_bits,
 609                       tformat->rsvd_shift, tformat->rsvd_mask);
 610
 611         *txsz = min_t(unsigned int, ULP2_MAX_PDU_PAYLOAD,
 612                         ddp->max_txsz - ISCSI_PDU_NONPAYLOAD_LEN);
 613         *rxsz = min_t(unsigned int, ULP2_MAX_PDU_PAYLOAD,
 614                         ddp->max_rxsz - ISCSI_PDU_NONPAYLOAD_LEN);
 615         ddp_log_info("max payload size: %u/%u, %u/%u.\n",
 616                      *txsz, ddp->max_txsz, *rxsz, ddp->max_rxsz);
 617         return 0;
 618 }
 619
 620 /**
 621  * cxgb3i_ddp_cleanup - release the cxgb3 adapter's ddp resource
 622  * @tdev: t3cdev adapter
 623  * release all the resource held by the ddp pagepod manager for a given
 624  * adapter if needed
 625  */
 626
 627 static void ddp_cleanup(struct kref *kref)
 628 {
 629         struct cxgb3i_ddp_info *ddp = container_of(kref,
 630                                                 struct cxgb3i_ddp_info,
 631                                                 refcnt);
 632         int i = 0;
 633
 634         ddp_log_info("kref release ddp 0x%p, t3dev 0x%p.\n", ddp, ddp->tdev);
 635
 636         ddp->tdev->ulp_iscsi = NULL;
 637         while (i < ddp->nppods) {
 638                 struct cxgb3i_gather_list *gl = ddp->gl_map[i];
 639                 if (gl) {
 640                         int npods = (gl->nelem + PPOD_PAGES_MAX - 1)
 641                                         >> PPOD_PAGES_SHIFT;
 642                         ddp_log_info("t3dev 0x%p, ddp %d + %d.\n",
 643                                         ddp->tdev, i, npods);
 644                         kfree(gl);
 645                         ddp_free_gl_skb(ddp, i, npods);
 646                         i += npods;
 647                 } else
 648                         i++;
 649         }
 650         cxgb3i_free_big_mem(ddp);
 651 }
 652
 653 void cxgb3i_ddp_cleanup(struct t3cdev *tdev)
 654 {
 655         struct cxgb3i_ddp_info *ddp = (struct cxgb3i_ddp_info *)tdev->ulp_iscsi;
 656
 657         ddp_log_info("t3dev 0x%p, release ddp 0x%p.\n", tdev, ddp);
 658         if (ddp)
 659                 kref_put(&ddp->refcnt, ddp_cleanup);
 660 }
 661
 662 /**
 663  * ddp_init - initialize the cxgb3 adapter's ddp resource
 664  * @tdev: t3cdev adapter
 665  * initialize the ddp pagepod manager for a given adapter
 666  */
 667 static void ddp_init(struct t3cdev *tdev)
 668 {
 669         struct cxgb3i_ddp_info *ddp = tdev->ulp_iscsi;
 670         struct ulp_iscsi_info uinfo;
 671         unsigned int ppmax, bits;
 672         int i, err;
 673
 674         if (ddp) {
 675                 kref_get(&ddp->refcnt);
 676                 ddp_log_warn("t3dev 0x%p, ddp 0x%p already set up.\n",
 677                                 tdev, tdev->ulp_iscsi);
 678                 return;
 679         }
 680
 681         err = tdev->ctl(tdev, ULP_ISCSI_GET_PARAMS, &uinfo);
 682         if (err < 0) {
 683                 ddp_log_error("%s, failed to get iscsi param err=%d.\n",
 684                                  tdev->name, err);
 685                 return;
 686         }
 687
 688         ppmax = (uinfo.ulimit - uinfo.llimit + 1) >> PPOD_SIZE_SHIFT;
 689         bits = __ilog2_u32(ppmax) + 1;
 690         if (bits > PPOD_IDX_MAX_SIZE)
 691                 bits = PPOD_IDX_MAX_SIZE;
 692         ppmax = (1 << (bits - 1)) - 1;
 693
 694         ddp = cxgb3i_alloc_big_mem(sizeof(struct cxgb3i_ddp_info) +
 695                                    ppmax *
 696                                         (sizeof(struct cxgb3i_gather_list *) +
 697                                         sizeof(struct sk_buff *)),
 698                                    GFP_KERNEL);
 699         if (!ddp) {
 700                 ddp_log_warn("%s unable to alloc ddp 0x%d, ddp disabled.\n",
 701                              tdev->name, ppmax);
 702                 return;
 703         }
 704         ddp->gl_map = (struct cxgb3i_gather_list **)(ddp + 1);
 705         ddp->gl_skb = (struct sk_buff **)(((char *)ddp->gl_map) +
 706                                           ppmax *
 707                                           sizeof(struct cxgb3i_gather_list *));
 708         spin_lock_init(&ddp->map_lock);
 709         kref_init(&ddp->refcnt);
 710
 711         ddp->tdev = tdev;
 712         ddp->pdev = uinfo.pdev;
 713         ddp->max_txsz = min_t(unsigned int, uinfo.max_txsz, ULP2_MAX_PKT_SIZE);
 714         ddp->max_rxsz = min_t(unsigned int, uinfo.max_rxsz, ULP2_MAX_PKT_SIZE);
 715         ddp->llimit = uinfo.llimit;
 716         ddp->ulimit = uinfo.ulimit;
 717         ddp->nppods = ppmax;
 718         ddp->idx_last = ppmax;
 719         ddp->idx_bits = bits;
 720         ddp->idx_mask = (1 << bits) - 1;
 721         ddp->rsvd_tag_mask = (1 << (bits + PPOD_IDX_SHIFT)) - 1;
 722
 723         uinfo.tagmask = ddp->idx_mask << PPOD_IDX_SHIFT;
 724         for (i = 0; i < DDP_PGIDX_MAX; i++)
 725                 uinfo.pgsz_factor[i] = ddp_page_order[i];
 726         uinfo.ulimit = uinfo.llimit + (ppmax << PPOD_SIZE_SHIFT);
 727
 728         err = tdev->ctl(tdev, ULP_ISCSI_SET_PARAMS, &uinfo);
 729         if (err < 0) {
 730                 ddp_log_warn("%s unable to set iscsi param err=%d, "
 731                               "ddp disabled.\n", tdev->name, err);
 732                 goto free_ddp_map;
 733         }
 734
 735         tdev->ulp_iscsi = ddp;
 736
 737         ddp_log_info("tdev 0x%p, nppods %u, bits %u, mask 0x%x,0x%x pkt %u/%u,"
 738                         " %u/%u.\n",
 739                         tdev, ppmax, ddp->idx_bits, ddp->idx_mask,
 740                         ddp->rsvd_tag_mask, ddp->max_txsz, uinfo.max_txsz,
 741                         ddp->max_rxsz, uinfo.max_rxsz);
 742         return;
 743
 744 free_ddp_map:
 745         cxgb3i_free_big_mem(ddp);
 746 }
 747
 748 /**
 749  * cxgb3i_ddp_init - initialize ddp functions
 750  */
 751 void cxgb3i_ddp_init(struct t3cdev *tdev)
 752 {
 753         if (page_idx == DDP_PGIDX_MAX) {
 754                 page_idx = cxgb3i_ddp_find_page_index(PAGE_SIZE);
 755
 756                 if (page_idx == DDP_PGIDX_MAX) {
 757                         ddp_log_info("system PAGE_SIZE %lu, update hw.\n",
 758                                         PAGE_SIZE);
 759                         if (cxgb3i_ddp_adjust_page_table() < 0) {
 760                                 ddp_log_info("PAGE_SIZE %lu, ddp disabled.\n",
 761                                                 PAGE_SIZE);
 762                                 return;
 763                         }
 764                         page_idx = cxgb3i_ddp_find_page_index(PAGE_SIZE);
 765                 }
 766                 ddp_log_info("system PAGE_SIZE %lu, ddp idx %u.\n",
 767                                 PAGE_SIZE, page_idx);
 768         }
 769         ddp_init(tdev);
 770 }