cxgb3i: suppot of different kernel page sizes
[linux-2.6.git] / 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                                           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 }