git.oblomov.eu Git - linux-2.6/blob - drivers/infiniband/hw/cxgb3/cxio_hal.c

   1 /*
   2  * Copyright (c) 2006 Chelsio, Inc. All rights reserved.
   3  *
   4  * This software is available to you under a choice of one of two
   5  * licenses.  You may choose to be licensed under the terms of the GNU
   6  * General Public License (GPL) Version 2, available from the file
   7  * COPYING in the main directory of this source tree, or the
   8  * OpenIB.org BSD license below:
   9  *
  10  *     Redistribution and use in source and binary forms, with or
  11  *     without modification, are permitted provided that the following
  12  *     conditions are met:
  13  *
  14  *      - Redistributions of source code must retain the above
  15  *        copyright notice, this list of conditions and the following
  16  *        disclaimer.
  17  *
  18  *      - Redistributions in binary form must reproduce the above
  19  *        copyright notice, this list of conditions and the following
  20  *        disclaimer in the documentation and/or other materials
  21  *        provided with the distribution.
  22  *
  23  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  24  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  25  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  26  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  27  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  28  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  29  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  30  * SOFTWARE.
  31  */
  32 #include <asm/delay.h>
  33
  34 #include <linux/mutex.h>
  35 #include <linux/netdevice.h>
  36 #include <linux/sched.h>
  37 #include <linux/spinlock.h>
  38 #include <linux/pci.h>
  39 #include <linux/dma-mapping.h>
  40
  41 #include "cxio_resource.h"
  42 #include "cxio_hal.h"
  43 #include "cxgb3_offload.h"
  44 #include "sge_defs.h"
  45
  46 static LIST_HEAD(rdev_list);
  47 static cxio_hal_ev_callback_func_t cxio_ev_cb = NULL;
  48
  49 static struct cxio_rdev *cxio_hal_find_rdev_by_name(char *dev_name)
  50 {
  51         struct cxio_rdev *rdev;
  52
  53         list_for_each_entry(rdev, &rdev_list, entry)
  54                 if (!strcmp(rdev->dev_name, dev_name))
  55                         return rdev;
  56         return NULL;
  57 }
  58
  59 static struct cxio_rdev *cxio_hal_find_rdev_by_t3cdev(struct t3cdev *tdev)
  60 {
  61         struct cxio_rdev *rdev;
  62
  63         list_for_each_entry(rdev, &rdev_list, entry)
  64                 if (rdev->t3cdev_p == tdev)
  65                         return rdev;
  66         return NULL;
  67 }
  68
  69 int cxio_hal_cq_op(struct cxio_rdev *rdev_p, struct t3_cq *cq,
  70                    enum t3_cq_opcode op, u32 credit)
  71 {
  72         int ret;
  73         struct t3_cqe *cqe;
  74         u32 rptr;
  75
  76         struct rdma_cq_op setup;
  77         setup.id = cq->cqid;
  78         setup.credits = (op == CQ_CREDIT_UPDATE) ? credit : 0;
  79         setup.op = op;
  80         ret = rdev_p->t3cdev_p->ctl(rdev_p->t3cdev_p, RDMA_CQ_OP, &setup);
  81
  82         if ((ret < 0) || (op == CQ_CREDIT_UPDATE))
  83                 return ret;
  84
  85         /*
  86          * If the rearm returned an index other than our current index,
  87          * then there might be CQE's in flight (being DMA'd).  We must wait
  88          * here for them to complete or the consumer can miss a notification.
  89          */
  90         if (Q_PTR2IDX((cq->rptr), cq->size_log2) != ret) {
  91                 int i=0;
  92
  93                 rptr = cq->rptr;
  94
  95                 /*
  96                  * Keep the generation correct by bumping rptr until it
  97                  * matches the index returned by the rearm - 1.
  98                  */
  99                 while (Q_PTR2IDX((rptr+1), cq->size_log2) != ret)
 100                         rptr++;
 101
 102                 /*
 103                  * Now rptr is the index for the (last) cqe that was
 104                  * in-flight at the time the HW rearmed the CQ.  We
 105                  * spin until that CQE is valid.
 106                  */
 107                 cqe = cq->queue + Q_PTR2IDX(rptr, cq->size_log2);
 108                 while (!CQ_VLD_ENTRY(rptr, cq->size_log2, cqe)) {
 109                         udelay(1);
 110                         if (i++ > 1000000) {
 111                                 BUG_ON(1);
 112                                 printk(KERN_ERR "%s: stalled rnic\n",
 113                                        rdev_p->dev_name);
 114                                 return -EIO;
 115                         }
 116                 }
 117
 118                 return 1;
 119         }
 120
 121         return 0;
 122 }
 123
 124 static int cxio_hal_clear_cq_ctx(struct cxio_rdev *rdev_p, u32 cqid)
 125 {
 126         struct rdma_cq_setup setup;
 127         setup.id = cqid;
 128         setup.base_addr = 0;    /* NULL address */
 129         setup.size = 0;         /* disaable the CQ */
 130         setup.credits = 0;
 131         setup.credit_thres = 0;
 132         setup.ovfl_mode = 0;
 133         return (rdev_p->t3cdev_p->ctl(rdev_p->t3cdev_p, RDMA_CQ_SETUP, &setup));
 134 }
 135
 136 static int cxio_hal_clear_qp_ctx(struct cxio_rdev *rdev_p, u32 qpid)
 137 {
 138         u64 sge_cmd;
 139         struct t3_modify_qp_wr *wqe;
 140         struct sk_buff *skb = alloc_skb(sizeof(*wqe), GFP_KERNEL);
 141         if (!skb) {
 142                 PDBG("%s alloc_skb failed\n", __FUNCTION__);
 143                 return -ENOMEM;
 144         }
 145         wqe = (struct t3_modify_qp_wr *) skb_put(skb, sizeof(*wqe));
 146         memset(wqe, 0, sizeof(*wqe));
 147         build_fw_riwrh((struct fw_riwrh *) wqe, T3_WR_QP_MOD, 3, 0, qpid, 7);
 148         wqe->flags = cpu_to_be32(MODQP_WRITE_EC);
 149         sge_cmd = qpid << 8 | 3;
 150         wqe->sge_cmd = cpu_to_be64(sge_cmd);
 151         skb->priority = CPL_PRIORITY_CONTROL;
 152         return (cxgb3_ofld_send(rdev_p->t3cdev_p, skb));
 153 }
 154
 155 int cxio_create_cq(struct cxio_rdev *rdev_p, struct t3_cq *cq)
 156 {
 157         struct rdma_cq_setup setup;
 158         int size = (1UL << (cq->size_log2)) * sizeof(struct t3_cqe);
 159
 160         cq->cqid = cxio_hal_get_cqid(rdev_p->rscp);
 161         if (!cq->cqid)
 162                 return -ENOMEM;
 163         cq->sw_queue = kzalloc(size, GFP_KERNEL);
 164         if (!cq->sw_queue)
 165                 return -ENOMEM;
 166         cq->queue = dma_alloc_coherent(&(rdev_p->rnic_info.pdev->dev),
 167                                              (1UL << (cq->size_log2)) *
 168                                              sizeof(struct t3_cqe),
 169                                              &(cq->dma_addr), GFP_KERNEL);
 170         if (!cq->queue) {
 171                 kfree(cq->sw_queue);
 172                 return -ENOMEM;
 173         }
 174         pci_unmap_addr_set(cq, mapping, cq->dma_addr);
 175         memset(cq->queue, 0, size);
 176         setup.id = cq->cqid;
 177         setup.base_addr = (u64) (cq->dma_addr);
 178         setup.size = 1UL << cq->size_log2;
 179         setup.credits = 65535;
 180         setup.credit_thres = 1;
 181         if (rdev_p->t3cdev_p->type == T3B)
 182                 setup.ovfl_mode = 0;
 183         else
 184                 setup.ovfl_mode = 1;
 185         return (rdev_p->t3cdev_p->ctl(rdev_p->t3cdev_p, RDMA_CQ_SETUP, &setup));
 186 }
 187
 188 int cxio_resize_cq(struct cxio_rdev *rdev_p, struct t3_cq *cq)
 189 {
 190         struct rdma_cq_setup setup;
 191         setup.id = cq->cqid;
 192         setup.base_addr = (u64) (cq->dma_addr);
 193         setup.size = 1UL << cq->size_log2;
 194         setup.credits = setup.size;
 195         setup.credit_thres = setup.size;        /* TBD: overflow recovery */
 196         setup.ovfl_mode = 1;
 197         return (rdev_p->t3cdev_p->ctl(rdev_p->t3cdev_p, RDMA_CQ_SETUP, &setup));
 198 }
 199
 200 static u32 get_qpid(struct cxio_rdev *rdev_p, struct cxio_ucontext *uctx)
 201 {
 202         struct cxio_qpid_list *entry;
 203         u32 qpid;
 204         int i;
 205
 206         mutex_lock(&uctx->lock);
 207         if (!list_empty(&uctx->qpids)) {
 208                 entry = list_entry(uctx->qpids.next, struct cxio_qpid_list,
 209                                    entry);
 210                 list_del(&entry->entry);
 211                 qpid = entry->qpid;
 212                 kfree(entry);
 213         } else {
 214                 qpid = cxio_hal_get_qpid(rdev_p->rscp);
 215                 if (!qpid)
 216                         goto out;
 217                 for (i = qpid+1; i & rdev_p->qpmask; i++) {
 218                         entry = kmalloc(sizeof *entry, GFP_KERNEL);
 219                         if (!entry)
 220                                 break;
 221                         entry->qpid = i;
 222                         list_add_tail(&entry->entry, &uctx->qpids);
 223                 }
 224         }
 225 out:
 226         mutex_unlock(&uctx->lock);
 227         PDBG("%s qpid 0x%x\n", __FUNCTION__, qpid);
 228         return qpid;
 229 }
 230
 231 static void put_qpid(struct cxio_rdev *rdev_p, u32 qpid,
 232                      struct cxio_ucontext *uctx)
 233 {
 234         struct cxio_qpid_list *entry;
 235
 236         entry = kmalloc(sizeof *entry, GFP_KERNEL);
 237         if (!entry)
 238                 return;
 239         PDBG("%s qpid 0x%x\n", __FUNCTION__, qpid);
 240         entry->qpid = qpid;
 241         mutex_lock(&uctx->lock);
 242         list_add_tail(&entry->entry, &uctx->qpids);
 243         mutex_unlock(&uctx->lock);
 244 }
 245
 246 void cxio_release_ucontext(struct cxio_rdev *rdev_p, struct cxio_ucontext *uctx)
 247 {
 248         struct list_head *pos, *nxt;
 249         struct cxio_qpid_list *entry;
 250
 251         mutex_lock(&uctx->lock);
 252         list_for_each_safe(pos, nxt, &uctx->qpids) {
 253                 entry = list_entry(pos, struct cxio_qpid_list, entry);
 254                 list_del_init(&entry->entry);
 255                 if (!(entry->qpid & rdev_p->qpmask))
 256                         cxio_hal_put_qpid(rdev_p->rscp, entry->qpid);
 257                 kfree(entry);
 258         }
 259         mutex_unlock(&uctx->lock);
 260 }
 261
 262 void cxio_init_ucontext(struct cxio_rdev *rdev_p, struct cxio_ucontext *uctx)
 263 {
 264         INIT_LIST_HEAD(&uctx->qpids);
 265         mutex_init(&uctx->lock);
 266 }
 267
 268 int cxio_create_qp(struct cxio_rdev *rdev_p, u32 kernel_domain,
 269                    struct t3_wq *wq, struct cxio_ucontext *uctx)
 270 {
 271         int depth = 1UL << wq->size_log2;
 272         int rqsize = 1UL << wq->rq_size_log2;
 273
 274         wq->qpid = get_qpid(rdev_p, uctx);
 275         if (!wq->qpid)
 276                 return -ENOMEM;
 277
 278         wq->rq = kzalloc(depth * sizeof(u64), GFP_KERNEL);
 279         if (!wq->rq)
 280                 goto err1;
 281
 282         wq->rq_addr = cxio_hal_rqtpool_alloc(rdev_p, rqsize);
 283         if (!wq->rq_addr)
 284                 goto err2;
 285
 286         wq->sq = kzalloc(depth * sizeof(struct t3_swsq), GFP_KERNEL);
 287         if (!wq->sq)
 288                 goto err3;
 289
 290         wq->queue = dma_alloc_coherent(&(rdev_p->rnic_info.pdev->dev),
 291                                              depth * sizeof(union t3_wr),
 292                                              &(wq->dma_addr), GFP_KERNEL);
 293         if (!wq->queue)
 294                 goto err4;
 295
 296         memset(wq->queue, 0, depth * sizeof(union t3_wr));
 297         pci_unmap_addr_set(wq, mapping, wq->dma_addr);
 298         wq->doorbell = (void __iomem *)rdev_p->rnic_info.kdb_addr;
 299         if (!kernel_domain)
 300                 wq->udb = (u64)rdev_p->rnic_info.udbell_physbase +
 301                                         (wq->qpid << rdev_p->qpshift);
 302         PDBG("%s qpid 0x%x doorbell 0x%p udb 0x%llx\n", __FUNCTION__,
 303              wq->qpid, wq->doorbell, (unsigned long long) wq->udb);
 304         return 0;
 305 err4:
 306         kfree(wq->sq);
 307 err3:
 308         cxio_hal_rqtpool_free(rdev_p, wq->rq_addr, rqsize);
 309 err2:
 310         kfree(wq->rq);
 311 err1:
 312         put_qpid(rdev_p, wq->qpid, uctx);
 313         return -ENOMEM;
 314 }
 315
 316 int cxio_destroy_cq(struct cxio_rdev *rdev_p, struct t3_cq *cq)
 317 {
 318         int err;
 319         err = cxio_hal_clear_cq_ctx(rdev_p, cq->cqid);
 320         kfree(cq->sw_queue);
 321         dma_free_coherent(&(rdev_p->rnic_info.pdev->dev),
 322                           (1UL << (cq->size_log2))
 323                           * sizeof(struct t3_cqe), cq->queue,
 324                           pci_unmap_addr(cq, mapping));
 325         cxio_hal_put_cqid(rdev_p->rscp, cq->cqid);
 326         return err;
 327 }
 328
 329 int cxio_destroy_qp(struct cxio_rdev *rdev_p, struct t3_wq *wq,
 330                     struct cxio_ucontext *uctx)
 331 {
 332         dma_free_coherent(&(rdev_p->rnic_info.pdev->dev),
 333                           (1UL << (wq->size_log2))
 334                           * sizeof(union t3_wr), wq->queue,
 335                           pci_unmap_addr(wq, mapping));
 336         kfree(wq->sq);
 337         cxio_hal_rqtpool_free(rdev_p, wq->rq_addr, (1UL << wq->rq_size_log2));
 338         kfree(wq->rq);
 339         put_qpid(rdev_p, wq->qpid, uctx);
 340         return 0;
 341 }
 342
 343 static void insert_recv_cqe(struct t3_wq *wq, struct t3_cq *cq)
 344 {
 345         struct t3_cqe cqe;
 346
 347         PDBG("%s wq %p cq %p sw_rptr 0x%x sw_wptr 0x%x\n", __FUNCTION__,
 348              wq, cq, cq->sw_rptr, cq->sw_wptr);
 349         memset(&cqe, 0, sizeof(cqe));
 350         cqe.header = cpu_to_be32(V_CQE_STATUS(TPT_ERR_SWFLUSH) |
 351                                  V_CQE_OPCODE(T3_SEND) |
 352                                  V_CQE_TYPE(0) |
 353                                  V_CQE_SWCQE(1) |
 354                                  V_CQE_QPID(wq->qpid) |
 355                                  V_CQE_GENBIT(Q_GENBIT(cq->sw_wptr,
 356                                                        cq->size_log2)));
 357         *(cq->sw_queue + Q_PTR2IDX(cq->sw_wptr, cq->size_log2)) = cqe;
 358         cq->sw_wptr++;
 359 }
 360
 361 void cxio_flush_rq(struct t3_wq *wq, struct t3_cq *cq, int count)
 362 {
 363         u32 ptr;
 364
 365         PDBG("%s wq %p cq %p\n", __FUNCTION__, wq, cq);
 366
 367         /* flush RQ */
 368         PDBG("%s rq_rptr %u rq_wptr %u skip count %u\n", __FUNCTION__,
 369             wq->rq_rptr, wq->rq_wptr, count);
 370         ptr = wq->rq_rptr + count;
 371         while (ptr++ != wq->rq_wptr)
 372                 insert_recv_cqe(wq, cq);
 373 }
 374
 375 static void insert_sq_cqe(struct t3_wq *wq, struct t3_cq *cq,
 376                           struct t3_swsq *sqp)
 377 {
 378         struct t3_cqe cqe;
 379
 380         PDBG("%s wq %p cq %p sw_rptr 0x%x sw_wptr 0x%x\n", __FUNCTION__,
 381              wq, cq, cq->sw_rptr, cq->sw_wptr);
 382         memset(&cqe, 0, sizeof(cqe));
 383         cqe.header = cpu_to_be32(V_CQE_STATUS(TPT_ERR_SWFLUSH) |
 384                                  V_CQE_OPCODE(sqp->opcode) |
 385                                  V_CQE_TYPE(1) |
 386                                  V_CQE_SWCQE(1) |
 387                                  V_CQE_QPID(wq->qpid) |
 388                                  V_CQE_GENBIT(Q_GENBIT(cq->sw_wptr,
 389                                                        cq->size_log2)));
 390         cqe.u.scqe.wrid_hi = sqp->sq_wptr;
 391
 392         *(cq->sw_queue + Q_PTR2IDX(cq->sw_wptr, cq->size_log2)) = cqe;
 393         cq->sw_wptr++;
 394 }
 395
 396 void cxio_flush_sq(struct t3_wq *wq, struct t3_cq *cq, int count)
 397 {
 398         __u32 ptr;
 399         struct t3_swsq *sqp = wq->sq + Q_PTR2IDX(wq->sq_rptr, wq->sq_size_log2);
 400
 401         ptr = wq->sq_rptr + count;
 402         sqp += count;
 403         while (ptr != wq->sq_wptr) {
 404                 insert_sq_cqe(wq, cq, sqp);
 405                 sqp++;
 406                 ptr++;
 407         }
 408 }
 409
 410 /*
 411  * Move all CQEs from the HWCQ into the SWCQ.
 412  */
 413 void cxio_flush_hw_cq(struct t3_cq *cq)
 414 {
 415         struct t3_cqe *cqe, *swcqe;
 416
 417         PDBG("%s cq %p cqid 0x%x\n", __FUNCTION__, cq, cq->cqid);
 418         cqe = cxio_next_hw_cqe(cq);
 419         while (cqe) {
 420                 PDBG("%s flushing hwcq rptr 0x%x to swcq wptr 0x%x\n",
 421                      __FUNCTION__, cq->rptr, cq->sw_wptr);
 422                 swcqe = cq->sw_queue + Q_PTR2IDX(cq->sw_wptr, cq->size_log2);
 423                 *swcqe = *cqe;
 424                 swcqe->header |= cpu_to_be32(V_CQE_SWCQE(1));
 425                 cq->sw_wptr++;
 426                 cq->rptr++;
 427                 cqe = cxio_next_hw_cqe(cq);
 428         }
 429 }
 430
 431 static int cqe_completes_wr(struct t3_cqe *cqe, struct t3_wq *wq)
 432 {
 433         if (CQE_OPCODE(*cqe) == T3_TERMINATE)
 434                 return 0;
 435
 436         if ((CQE_OPCODE(*cqe) == T3_RDMA_WRITE) && RQ_TYPE(*cqe))
 437                 return 0;
 438
 439         if ((CQE_OPCODE(*cqe) == T3_READ_RESP) && SQ_TYPE(*cqe))
 440                 return 0;
 441
 442         if ((CQE_OPCODE(*cqe) == T3_SEND) && RQ_TYPE(*cqe) &&
 443             Q_EMPTY(wq->rq_rptr, wq->rq_wptr))
 444                 return 0;
 445
 446         return 1;
 447 }
 448
 449 void cxio_count_scqes(struct t3_cq *cq, struct t3_wq *wq, int *count)
 450 {
 451         struct t3_cqe *cqe;
 452         u32 ptr;
 453
 454         *count = 0;
 455         ptr = cq->sw_rptr;
 456         while (!Q_EMPTY(ptr, cq->sw_wptr)) {
 457                 cqe = cq->sw_queue + (Q_PTR2IDX(ptr, cq->size_log2));
 458                 if ((SQ_TYPE(*cqe) || (CQE_OPCODE(*cqe) == T3_READ_RESP)) &&
 459                     (CQE_QPID(*cqe) == wq->qpid))
 460                         (*count)++;
 461                 ptr++;
 462         }
 463         PDBG("%s cq %p count %d\n", __FUNCTION__, cq, *count);
 464 }
 465
 466 void cxio_count_rcqes(struct t3_cq *cq, struct t3_wq *wq, int *count)
 467 {
 468         struct t3_cqe *cqe;
 469         u32 ptr;
 470
 471         *count = 0;
 472         PDBG("%s count zero %d\n", __FUNCTION__, *count);
 473         ptr = cq->sw_rptr;
 474         while (!Q_EMPTY(ptr, cq->sw_wptr)) {
 475                 cqe = cq->sw_queue + (Q_PTR2IDX(ptr, cq->size_log2));
 476                 if (RQ_TYPE(*cqe) && (CQE_OPCODE(*cqe) != T3_READ_RESP) &&
 477                     (CQE_QPID(*cqe) == wq->qpid) && cqe_completes_wr(cqe, wq))
 478                         (*count)++;
 479                 ptr++;
 480         }
 481         PDBG("%s cq %p count %d\n", __FUNCTION__, cq, *count);
 482 }
 483
 484 static int cxio_hal_init_ctrl_cq(struct cxio_rdev *rdev_p)
 485 {
 486         struct rdma_cq_setup setup;
 487         setup.id = 0;
 488         setup.base_addr = 0;    /* NULL address */
 489         setup.size = 1;         /* enable the CQ */
 490         setup.credits = 0;
 491
 492         /* force SGE to redirect to RspQ and interrupt */
 493         setup.credit_thres = 0;
 494         setup.ovfl_mode = 1;
 495         return (rdev_p->t3cdev_p->ctl(rdev_p->t3cdev_p, RDMA_CQ_SETUP, &setup));
 496 }
 497
 498 static int cxio_hal_init_ctrl_qp(struct cxio_rdev *rdev_p)
 499 {
 500         int err;
 501         u64 sge_cmd, ctx0, ctx1;
 502         u64 base_addr;
 503         struct t3_modify_qp_wr *wqe;
 504         struct sk_buff *skb;
 505
 506         skb = alloc_skb(sizeof(*wqe), GFP_KERNEL);
 507         if (!skb) {
 508                 PDBG("%s alloc_skb failed\n", __FUNCTION__);
 509                 return -ENOMEM;
 510         }
 511         err = cxio_hal_init_ctrl_cq(rdev_p);
 512         if (err) {
 513                 PDBG("%s err %d initializing ctrl_cq\n", __FUNCTION__, err);
 514                 goto err;
 515         }
 516         rdev_p->ctrl_qp.workq = dma_alloc_coherent(
 517                                         &(rdev_p->rnic_info.pdev->dev),
 518                                         (1 << T3_CTRL_QP_SIZE_LOG2) *
 519                                         sizeof(union t3_wr),
 520                                         &(rdev_p->ctrl_qp.dma_addr),
 521                                         GFP_KERNEL);
 522         if (!rdev_p->ctrl_qp.workq) {
 523                 PDBG("%s dma_alloc_coherent failed\n", __FUNCTION__);
 524                 err = -ENOMEM;
 525                 goto err;
 526         }
 527         pci_unmap_addr_set(&rdev_p->ctrl_qp, mapping,
 528                            rdev_p->ctrl_qp.dma_addr);
 529         rdev_p->ctrl_qp.doorbell = (void __iomem *)rdev_p->rnic_info.kdb_addr;
 530         memset(rdev_p->ctrl_qp.workq, 0,
 531                (1 << T3_CTRL_QP_SIZE_LOG2) * sizeof(union t3_wr));
 532
 533         mutex_init(&rdev_p->ctrl_qp.lock);
 534         init_waitqueue_head(&rdev_p->ctrl_qp.waitq);
 535
 536         /* update HW Ctrl QP context */
 537         base_addr = rdev_p->ctrl_qp.dma_addr;
 538         base_addr >>= 12;
 539         ctx0 = (V_EC_SIZE((1 << T3_CTRL_QP_SIZE_LOG2)) |
 540                 V_EC_BASE_LO((u32) base_addr & 0xffff));
 541         ctx0 <<= 32;
 542         ctx0 |= V_EC_CREDITS(FW_WR_NUM);
 543         base_addr >>= 16;
 544         ctx1 = (u32) base_addr;
 545         base_addr >>= 32;
 546         ctx1 |= ((u64) (V_EC_BASE_HI((u32) base_addr & 0xf) | V_EC_RESPQ(0) |
 547                         V_EC_TYPE(0) | V_EC_GEN(1) |
 548                         V_EC_UP_TOKEN(T3_CTL_QP_TID) | F_EC_VALID)) << 32;
 549         wqe = (struct t3_modify_qp_wr *) skb_put(skb, sizeof(*wqe));
 550         memset(wqe, 0, sizeof(*wqe));
 551         build_fw_riwrh((struct fw_riwrh *) wqe, T3_WR_QP_MOD, 0, 0,
 552                        T3_CTL_QP_TID, 7);
 553         wqe->flags = cpu_to_be32(MODQP_WRITE_EC);
 554         sge_cmd = (3ULL << 56) | FW_RI_SGEEC_START << 8 | 3;
 555         wqe->sge_cmd = cpu_to_be64(sge_cmd);
 556         wqe->ctx1 = cpu_to_be64(ctx1);
 557         wqe->ctx0 = cpu_to_be64(ctx0);
 558         PDBG("CtrlQP dma_addr 0x%llx workq %p size %d\n",
 559              (unsigned long long) rdev_p->ctrl_qp.dma_addr,
 560              rdev_p->ctrl_qp.workq, 1 << T3_CTRL_QP_SIZE_LOG2);
 561         skb->priority = CPL_PRIORITY_CONTROL;
 562         return (cxgb3_ofld_send(rdev_p->t3cdev_p, skb));
 563 err:
 564         kfree_skb(skb);
 565         return err;
 566 }
 567
 568 static int cxio_hal_destroy_ctrl_qp(struct cxio_rdev *rdev_p)
 569 {
 570         dma_free_coherent(&(rdev_p->rnic_info.pdev->dev),
 571                           (1UL << T3_CTRL_QP_SIZE_LOG2)
 572                           * sizeof(union t3_wr), rdev_p->ctrl_qp.workq,
 573                           pci_unmap_addr(&rdev_p->ctrl_qp, mapping));
 574         return cxio_hal_clear_qp_ctx(rdev_p, T3_CTRL_QP_ID);
 575 }
 576
 577 /* write len bytes of data into addr (32B aligned address)
 578  * If data is NULL, clear len byte of memory to zero.
 579  * caller aquires the ctrl_qp lock before the call
 580  */
 581 static int cxio_hal_ctrl_qp_write_mem(struct cxio_rdev *rdev_p, u32 addr,
 582                                       u32 len, void *data, int completion)
 583 {
 584         u32 i, nr_wqe, copy_len;
 585         u8 *copy_data;
 586         u8 wr_len, utx_len;     /* lenght in 8 byte flit */
 587         enum t3_wr_flags flag;
 588         __be64 *wqe;
 589         u64 utx_cmd;
 590         addr &= 0x7FFFFFF;
 591         nr_wqe = len % 96 ? len / 96 + 1 : len / 96;    /* 96B max per WQE */
 592         PDBG("%s wptr 0x%x rptr 0x%x len %d, nr_wqe %d data %p addr 0x%0x\n",
 593              __FUNCTION__, rdev_p->ctrl_qp.wptr, rdev_p->ctrl_qp.rptr, len,
 594              nr_wqe, data, addr);
 595         utx_len = 3;            /* in 32B unit */
 596         for (i = 0; i < nr_wqe; i++) {
 597                 if (Q_FULL(rdev_p->ctrl_qp.rptr, rdev_p->ctrl_qp.wptr,
 598                            T3_CTRL_QP_SIZE_LOG2)) {
 599                         PDBG("%s ctrl_qp full wtpr 0x%0x rptr 0x%0x, "
 600                              "wait for more space i %d\n", __FUNCTION__,
 601                              rdev_p->ctrl_qp.wptr, rdev_p->ctrl_qp.rptr, i);
 602                         if (wait_event_interruptible(rdev_p->ctrl_qp.waitq,
 603                                              !Q_FULL(rdev_p->ctrl_qp.rptr,
 604                                                      rdev_p->ctrl_qp.wptr,
 605                                                      T3_CTRL_QP_SIZE_LOG2))) {
 606                                 PDBG("%s ctrl_qp workq interrupted\n",
 607                                      __FUNCTION__);
 608                                 return -ERESTARTSYS;
 609                         }
 610                         PDBG("%s ctrl_qp wakeup, continue posting work request "
 611                              "i %d\n", __FUNCTION__, i);
 612                 }
 613                 wqe = (__be64 *)(rdev_p->ctrl_qp.workq + (rdev_p->ctrl_qp.wptr %
 614                                                 (1 << T3_CTRL_QP_SIZE_LOG2)));
 615                 flag = 0;
 616                 if (i == (nr_wqe - 1)) {
 617                         /* last WQE */
 618                         flag = completion ? T3_COMPLETION_FLAG : 0;
 619                         if (len % 32)
 620                                 utx_len = len / 32 + 1;
 621                         else
 622                                 utx_len = len / 32;
 623                 }
 624
 625                 /*
 626                  * Force a CQE to return the credit to the workq in case
 627                  * we posted more than half the max QP size of WRs
 628                  */
 629                 if ((i != 0) &&
 630                     (i % (((1 << T3_CTRL_QP_SIZE_LOG2)) >> 1) == 0)) {
 631                         flag = T3_COMPLETION_FLAG;
 632                         PDBG("%s force completion at i %d\n", __FUNCTION__, i);
 633                 }
 634
 635                 /* build the utx mem command */
 636                 wqe += (sizeof(struct t3_bypass_wr) >> 3);
 637                 utx_cmd = (T3_UTX_MEM_WRITE << 28) | (addr + i * 3);
 638                 utx_cmd <<= 32;
 639                 utx_cmd |= (utx_len << 28) | ((utx_len << 2) + 1);
 640                 *wqe = cpu_to_be64(utx_cmd);
 641                 wqe++;
 642                 copy_data = (u8 *) data + i * 96;
 643                 copy_len = len > 96 ? 96 : len;
 644
 645                 /* clear memory content if data is NULL */
 646                 if (data)
 647                         memcpy(wqe, copy_data, copy_len);
 648                 else
 649                         memset(wqe, 0, copy_len);
 650                 if (copy_len % 32)
 651                         memset(((u8 *) wqe) + copy_len, 0,
 652                                32 - (copy_len % 32));
 653                 wr_len = ((sizeof(struct t3_bypass_wr)) >> 3) + 1 +
 654                          (utx_len << 2);
 655                 wqe = (__be64 *)(rdev_p->ctrl_qp.workq + (rdev_p->ctrl_qp.wptr %
 656                               (1 << T3_CTRL_QP_SIZE_LOG2)));
 657
 658                 /* wptr in the WRID[31:0] */
 659                 ((union t3_wrid *)(wqe+1))->id0.low = rdev_p->ctrl_qp.wptr;
 660
 661                 /*
 662                  * This must be the last write with a memory barrier
 663                  * for the genbit
 664                  */
 665                 build_fw_riwrh((struct fw_riwrh *) wqe, T3_WR_BP, flag,
 666                                Q_GENBIT(rdev_p->ctrl_qp.wptr,
 667                                         T3_CTRL_QP_SIZE_LOG2), T3_CTRL_QP_ID,
 668                                wr_len);
 669                 if (flag == T3_COMPLETION_FLAG)
 670                         ring_doorbell(rdev_p->ctrl_qp.doorbell, T3_CTRL_QP_ID);
 671                 len -= 96;
 672                 rdev_p->ctrl_qp.wptr++;
 673         }
 674         return 0;
 675 }
 676
 677 /* IN: stag key, pdid, perm, zbva, to, len, page_size, pbl, and pbl_size
 678  * OUT: stag index, actual pbl_size, pbl_addr allocated.
 679  * TBD: shared memory region support
 680  */
 681 static int __cxio_tpt_op(struct cxio_rdev *rdev_p, u32 reset_tpt_entry,
 682                          u32 *stag, u8 stag_state, u32 pdid,
 683                          enum tpt_mem_type type, enum tpt_mem_perm perm,
 684                          u32 zbva, u64 to, u32 len, u8 page_size, __be64 *pbl,
 685                          u32 *pbl_size, u32 *pbl_addr)
 686 {
 687         int err;
 688         struct tpt_entry tpt;
 689         u32 stag_idx;
 690         u32 wptr;
 691         int rereg = (*stag != T3_STAG_UNSET);
 692
 693         stag_state = stag_state > 0;
 694         stag_idx = (*stag) >> 8;
 695
 696         if ((!reset_tpt_entry) && !(*stag != T3_STAG_UNSET)) {
 697                 stag_idx = cxio_hal_get_stag(rdev_p->rscp);
 698                 if (!stag_idx)
 699                         return -ENOMEM;
 700                 *stag = (stag_idx << 8) | ((*stag) & 0xFF);
 701         }
 702         PDBG("%s stag_state 0x%0x type 0x%0x pdid 0x%0x, stag_idx 0x%x\n",
 703              __FUNCTION__, stag_state, type, pdid, stag_idx);
 704
 705         if (reset_tpt_entry)
 706                 cxio_hal_pblpool_free(rdev_p, *pbl_addr, *pbl_size << 3);
 707         else if (!rereg) {
 708                 *pbl_addr = cxio_hal_pblpool_alloc(rdev_p, *pbl_size << 3);
 709                 if (!*pbl_addr) {
 710                         return -ENOMEM;
 711                 }
 712         }
 713
 714         mutex_lock(&rdev_p->ctrl_qp.lock);
 715
 716         /* write PBL first if any - update pbl only if pbl list exist */
 717         if (pbl) {
 718
 719                 PDBG("%s *pdb_addr 0x%x, pbl_base 0x%x, pbl_size %d\n",
 720                      __FUNCTION__, *pbl_addr, rdev_p->rnic_info.pbl_base,
 721                      *pbl_size);
 722                 err = cxio_hal_ctrl_qp_write_mem(rdev_p,
 723                                 (*pbl_addr >> 5),
 724                                 (*pbl_size << 3), pbl, 0);
 725                 if (err)
 726                         goto ret;
 727         }
 728
 729         /* write TPT entry */
 730         if (reset_tpt_entry)
 731                 memset(&tpt, 0, sizeof(tpt));
 732         else {
 733                 tpt.valid_stag_pdid = cpu_to_be32(F_TPT_VALID |
 734                                 V_TPT_STAG_KEY((*stag) & M_TPT_STAG_KEY) |
 735                                 V_TPT_STAG_STATE(stag_state) |
 736                                 V_TPT_STAG_TYPE(type) | V_TPT_PDID(pdid));
 737                 BUG_ON(page_size >= 28);
 738                 tpt.flags_pagesize_qpid = cpu_to_be32(V_TPT_PERM(perm) |
 739                                 F_TPT_MW_BIND_ENABLE |
 740                                 V_TPT_ADDR_TYPE((zbva ? TPT_ZBTO : TPT_VATO)) |
 741                                 V_TPT_PAGE_SIZE(page_size));
 742                 tpt.rsvd_pbl_addr = reset_tpt_entry ? 0 :
 743                                     cpu_to_be32(V_TPT_PBL_ADDR(PBL_OFF(rdev_p, *pbl_addr)>>3));
 744                 tpt.len = cpu_to_be32(len);
 745                 tpt.va_hi = cpu_to_be32((u32) (to >> 32));
 746                 tpt.va_low_or_fbo = cpu_to_be32((u32) (to & 0xFFFFFFFFULL));
 747                 tpt.rsvd_bind_cnt_or_pstag = 0;
 748                 tpt.rsvd_pbl_size = reset_tpt_entry ? 0 :
 749                                   cpu_to_be32(V_TPT_PBL_SIZE((*pbl_size) >> 2));
 750         }
 751         err = cxio_hal_ctrl_qp_write_mem(rdev_p,
 752                                        stag_idx +
 753                                        (rdev_p->rnic_info.tpt_base >> 5),
 754                                        sizeof(tpt), &tpt, 1);
 755
 756         /* release the stag index to free pool */
 757         if (reset_tpt_entry)
 758                 cxio_hal_put_stag(rdev_p->rscp, stag_idx);
 759 ret:
 760         wptr = rdev_p->ctrl_qp.wptr;
 761         mutex_unlock(&rdev_p->ctrl_qp.lock);
 762         if (!err)
 763                 if (wait_event_interruptible(rdev_p->ctrl_qp.waitq,
 764                                              SEQ32_GE(rdev_p->ctrl_qp.rptr,
 765                                                       wptr)))
 766                         return -ERESTARTSYS;
 767         return err;
 768 }
 769
 770 int cxio_register_phys_mem(struct cxio_rdev *rdev_p, u32 *stag, u32 pdid,
 771                            enum tpt_mem_perm perm, u32 zbva, u64 to, u32 len,
 772                            u8 page_size, __be64 *pbl, u32 *pbl_size,
 773                            u32 *pbl_addr)
 774 {
 775         *stag = T3_STAG_UNSET;
 776         return __cxio_tpt_op(rdev_p, 0, stag, 1, pdid, TPT_NON_SHARED_MR, perm,
 777                              zbva, to, len, page_size, pbl, pbl_size, pbl_addr);
 778 }
 779
 780 int cxio_reregister_phys_mem(struct cxio_rdev *rdev_p, u32 *stag, u32 pdid,
 781                            enum tpt_mem_perm perm, u32 zbva, u64 to, u32 len,
 782                            u8 page_size, __be64 *pbl, u32 *pbl_size,
 783                            u32 *pbl_addr)
 784 {
 785         return __cxio_tpt_op(rdev_p, 0, stag, 1, pdid, TPT_NON_SHARED_MR, perm,
 786                              zbva, to, len, page_size, pbl, pbl_size, pbl_addr);
 787 }
 788
 789 int cxio_dereg_mem(struct cxio_rdev *rdev_p, u32 stag, u32 pbl_size,
 790                    u32 pbl_addr)
 791 {
 792         return __cxio_tpt_op(rdev_p, 1, &stag, 0, 0, 0, 0, 0, 0ULL, 0, 0, NULL,
 793                              &pbl_size, &pbl_addr);
 794 }
 795
 796 int cxio_allocate_window(struct cxio_rdev *rdev_p, u32 * stag, u32 pdid)
 797 {
 798         u32 pbl_size = 0;
 799         *stag = T3_STAG_UNSET;
 800         return __cxio_tpt_op(rdev_p, 0, stag, 0, pdid, TPT_MW, 0, 0, 0ULL, 0, 0,
 801                              NULL, &pbl_size, NULL);
 802 }
 803
 804 int cxio_deallocate_window(struct cxio_rdev *rdev_p, u32 stag)
 805 {
 806         return __cxio_tpt_op(rdev_p, 1, &stag, 0, 0, 0, 0, 0, 0ULL, 0, 0, NULL,
 807                              NULL, NULL);
 808 }
 809
 810 int cxio_rdma_init(struct cxio_rdev *rdev_p, struct t3_rdma_init_attr *attr)
 811 {
 812         struct t3_rdma_init_wr *wqe;
 813         struct sk_buff *skb = alloc_skb(sizeof(*wqe), GFP_ATOMIC);
 814         if (!skb)
 815                 return -ENOMEM;
 816         PDBG("%s rdev_p %p\n", __FUNCTION__, rdev_p);
 817         wqe = (struct t3_rdma_init_wr *) __skb_put(skb, sizeof(*wqe));
 818         wqe->wrh.op_seop_flags = cpu_to_be32(V_FW_RIWR_OP(T3_WR_INIT));
 819         wqe->wrh.gen_tid_len = cpu_to_be32(V_FW_RIWR_TID(attr->tid) |
 820                                            V_FW_RIWR_LEN(sizeof(*wqe) >> 3));
 821         wqe->wrid.id1 = 0;
 822         wqe->qpid = cpu_to_be32(attr->qpid);
 823         wqe->pdid = cpu_to_be32(attr->pdid);
 824         wqe->scqid = cpu_to_be32(attr->scqid);
 825         wqe->rcqid = cpu_to_be32(attr->rcqid);
 826         wqe->rq_addr = cpu_to_be32(attr->rq_addr - rdev_p->rnic_info.rqt_base);
 827         wqe->rq_size = cpu_to_be32(attr->rq_size);
 828         wqe->mpaattrs = attr->mpaattrs;
 829         wqe->qpcaps = attr->qpcaps;
 830         wqe->ulpdu_size = cpu_to_be16(attr->tcp_emss);
 831         wqe->flags = cpu_to_be32(attr->flags);
 832         wqe->ord = cpu_to_be32(attr->ord);
 833         wqe->ird = cpu_to_be32(attr->ird);
 834         wqe->qp_dma_addr = cpu_to_be64(attr->qp_dma_addr);
 835         wqe->qp_dma_size = cpu_to_be32(attr->qp_dma_size);
 836         wqe->irs = cpu_to_be32(attr->irs);
 837         skb->priority = 0;      /* 0=>ToeQ; 1=>CtrlQ */
 838         return (cxgb3_ofld_send(rdev_p->t3cdev_p, skb));
 839 }
 840
 841 void cxio_register_ev_cb(cxio_hal_ev_callback_func_t ev_cb)
 842 {
 843         cxio_ev_cb = ev_cb;
 844 }
 845
 846 void cxio_unregister_ev_cb(cxio_hal_ev_callback_func_t ev_cb)
 847 {
 848         cxio_ev_cb = NULL;
 849 }
 850
 851 static int cxio_hal_ev_handler(struct t3cdev *t3cdev_p, struct sk_buff *skb)
 852 {
 853         static int cnt;
 854         struct cxio_rdev *rdev_p = NULL;
 855         struct respQ_msg_t *rsp_msg = (struct respQ_msg_t *) skb->data;
 856         PDBG("%d: %s cq_id 0x%x cq_ptr 0x%x genbit %0x overflow %0x an %0x"
 857              " se %0x notify %0x cqbranch %0x creditth %0x\n",
 858              cnt, __FUNCTION__, RSPQ_CQID(rsp_msg), RSPQ_CQPTR(rsp_msg),
 859              RSPQ_GENBIT(rsp_msg), RSPQ_OVERFLOW(rsp_msg), RSPQ_AN(rsp_msg),
 860              RSPQ_SE(rsp_msg), RSPQ_NOTIFY(rsp_msg), RSPQ_CQBRANCH(rsp_msg),
 861              RSPQ_CREDIT_THRESH(rsp_msg));
 862         PDBG("CQE: QPID 0x%0x genbit %0x type 0x%0x status 0x%0x opcode %d "
 863              "len 0x%0x wrid_hi_stag 0x%x wrid_low_msn 0x%x\n",
 864              CQE_QPID(rsp_msg->cqe), CQE_GENBIT(rsp_msg->cqe),
 865              CQE_TYPE(rsp_msg->cqe), CQE_STATUS(rsp_msg->cqe),
 866              CQE_OPCODE(rsp_msg->cqe), CQE_LEN(rsp_msg->cqe),
 867              CQE_WRID_HI(rsp_msg->cqe), CQE_WRID_LOW(rsp_msg->cqe));
 868         rdev_p = (struct cxio_rdev *)t3cdev_p->ulp;
 869         if (!rdev_p) {
 870                 PDBG("%s called by t3cdev %p with null ulp\n", __FUNCTION__,
 871                      t3cdev_p);
 872                 return 0;
 873         }
 874         if (CQE_QPID(rsp_msg->cqe) == T3_CTRL_QP_ID) {
 875                 rdev_p->ctrl_qp.rptr = CQE_WRID_LOW(rsp_msg->cqe) + 1;
 876                 wake_up_interruptible(&rdev_p->ctrl_qp.waitq);
 877                 dev_kfree_skb_irq(skb);
 878         } else if (CQE_QPID(rsp_msg->cqe) == 0xfff8)
 879                 dev_kfree_skb_irq(skb);
 880         else if (cxio_ev_cb)
 881                 (*cxio_ev_cb) (rdev_p, skb);
 882         else
 883                 dev_kfree_skb_irq(skb);
 884         cnt++;
 885         return 0;
 886 }
 887
 888 /* Caller takes care of locking if needed */
 889 int cxio_rdev_open(struct cxio_rdev *rdev_p)
 890 {
 891         struct net_device *netdev_p = NULL;
 892         int err = 0;
 893         if (strlen(rdev_p->dev_name)) {
 894                 if (cxio_hal_find_rdev_by_name(rdev_p->dev_name)) {
 895                         return -EBUSY;
 896                 }
 897                 netdev_p = dev_get_by_name(rdev_p->dev_name);
 898                 if (!netdev_p) {
 899                         return -EINVAL;
 900                 }
 901                 dev_put(netdev_p);
 902         } else if (rdev_p->t3cdev_p) {
 903                 if (cxio_hal_find_rdev_by_t3cdev(rdev_p->t3cdev_p)) {
 904                         return -EBUSY;
 905                 }
 906                 netdev_p = rdev_p->t3cdev_p->lldev;
 907                 strncpy(rdev_p->dev_name, rdev_p->t3cdev_p->name,
 908                         T3_MAX_DEV_NAME_LEN);
 909         } else {
 910                 PDBG("%s t3cdev_p or dev_name must be set\n", __FUNCTION__);
 911                 return -EINVAL;
 912         }
 913
 914         list_add_tail(&rdev_p->entry, &rdev_list);
 915
 916         PDBG("%s opening rnic dev %s\n", __FUNCTION__, rdev_p->dev_name);
 917         memset(&rdev_p->ctrl_qp, 0, sizeof(rdev_p->ctrl_qp));
 918         if (!rdev_p->t3cdev_p)
 919                 rdev_p->t3cdev_p = dev2t3cdev(netdev_p);
 920         rdev_p->t3cdev_p->ulp = (void *) rdev_p;
 921         err = rdev_p->t3cdev_p->ctl(rdev_p->t3cdev_p, RDMA_GET_PARAMS,
 922                                          &(rdev_p->rnic_info));
 923         if (err) {
 924                 printk(KERN_ERR "%s t3cdev_p(%p)->ctl returned error %d.\n",
 925                      __FUNCTION__, rdev_p->t3cdev_p, err);
 926                 goto err1;
 927         }
 928         err = rdev_p->t3cdev_p->ctl(rdev_p->t3cdev_p, GET_PORTS,
 929                                     &(rdev_p->port_info));
 930         if (err) {
 931                 printk(KERN_ERR "%s t3cdev_p(%p)->ctl returned error %d.\n",
 932                      __FUNCTION__, rdev_p->t3cdev_p, err);
 933                 goto err1;
 934         }
 935
 936         /*
 937          * qpshift is the number of bits to shift the qpid left in order
 938          * to get the correct address of the doorbell for that qp.
 939          */
 940         cxio_init_ucontext(rdev_p, &rdev_p->uctx);
 941         rdev_p->qpshift = PAGE_SHIFT -
 942                           ilog2(65536 >>
 943                                     ilog2(rdev_p->rnic_info.udbell_len >>
 944                                               PAGE_SHIFT));
 945         rdev_p->qpnr = rdev_p->rnic_info.udbell_len >> PAGE_SHIFT;
 946         rdev_p->qpmask = (65536 >> ilog2(rdev_p->qpnr)) - 1;
 947         PDBG("%s rnic %s info: tpt_base 0x%0x tpt_top 0x%0x num stags %d "
 948              "pbl_base 0x%0x pbl_top 0x%0x rqt_base 0x%0x, rqt_top 0x%0x\n",
 949              __FUNCTION__, rdev_p->dev_name, rdev_p->rnic_info.tpt_base,
 950              rdev_p->rnic_info.tpt_top, cxio_num_stags(rdev_p),
 951              rdev_p->rnic_info.pbl_base,
 952              rdev_p->rnic_info.pbl_top, rdev_p->rnic_info.rqt_base,
 953              rdev_p->rnic_info.rqt_top);
 954         PDBG("udbell_len 0x%0x udbell_physbase 0x%lx kdb_addr %p qpshift %lu "
 955              "qpnr %d qpmask 0x%x\n",
 956              rdev_p->rnic_info.udbell_len,
 957              rdev_p->rnic_info.udbell_physbase, rdev_p->rnic_info.kdb_addr,
 958              rdev_p->qpshift, rdev_p->qpnr, rdev_p->qpmask);
 959
 960         err = cxio_hal_init_ctrl_qp(rdev_p);
 961         if (err) {
 962                 printk(KERN_ERR "%s error %d initializing ctrl_qp.\n",
 963                        __FUNCTION__, err);
 964                 goto err1;
 965         }
 966         err = cxio_hal_init_resource(rdev_p, cxio_num_stags(rdev_p), 0,
 967                                      0, T3_MAX_NUM_QP, T3_MAX_NUM_CQ,
 968                                      T3_MAX_NUM_PD);
 969         if (err) {
 970                 printk(KERN_ERR "%s error %d initializing hal resources.\n",
 971                        __FUNCTION__, err);
 972                 goto err2;
 973         }
 974         err = cxio_hal_pblpool_create(rdev_p);
 975         if (err) {
 976                 printk(KERN_ERR "%s error %d initializing pbl mem pool.\n",
 977                        __FUNCTION__, err);
 978                 goto err3;
 979         }
 980         err = cxio_hal_rqtpool_create(rdev_p);
 981         if (err) {
 982                 printk(KERN_ERR "%s error %d initializing rqt mem pool.\n",
 983                        __FUNCTION__, err);
 984                 goto err4;
 985         }
 986         return 0;
 987 err4:
 988         cxio_hal_pblpool_destroy(rdev_p);
 989 err3:
 990         cxio_hal_destroy_resource(rdev_p->rscp);
 991 err2:
 992         cxio_hal_destroy_ctrl_qp(rdev_p);
 993 err1:
 994         list_del(&rdev_p->entry);
 995         return err;
 996 }
 997
 998 void cxio_rdev_close(struct cxio_rdev *rdev_p)
 999 {
1000         if (rdev_p) {
1001                 cxio_hal_pblpool_destroy(rdev_p);
1002                 cxio_hal_rqtpool_destroy(rdev_p);
1003                 list_del(&rdev_p->entry);
1004                 rdev_p->t3cdev_p->ulp = NULL;
1005                 cxio_hal_destroy_ctrl_qp(rdev_p);
1006                 cxio_hal_destroy_resource(rdev_p->rscp);
1007         }
1008 }
1009
1010 int __init cxio_hal_init(void)
1011 {
1012         if (cxio_hal_init_rhdl_resource(T3_MAX_NUM_RI))
1013                 return -ENOMEM;
1014         t3_register_cpl_handler(CPL_ASYNC_NOTIF, cxio_hal_ev_handler);
1015         return 0;
1016 }
1017
1018 void __exit cxio_hal_exit(void)
1019 {
1020         struct cxio_rdev *rdev, *tmp;
1021
1022         t3_register_cpl_handler(CPL_ASYNC_NOTIF, NULL);
1023         list_for_each_entry_safe(rdev, tmp, &rdev_list, entry)
1024                 cxio_rdev_close(rdev);
1025         cxio_hal_destroy_rhdl_resource();
1026 }
1027
1028 static void flush_completed_wrs(struct t3_wq *wq, struct t3_cq *cq)
1029 {
1030         struct t3_swsq *sqp;
1031         __u32 ptr = wq->sq_rptr;
1032         int count = Q_COUNT(wq->sq_rptr, wq->sq_wptr);
1033
1034         sqp = wq->sq + Q_PTR2IDX(ptr, wq->sq_size_log2);
1035         while (count--)
1036                 if (!sqp->signaled) {
1037                         ptr++;
1038                         sqp = wq->sq + Q_PTR2IDX(ptr,  wq->sq_size_log2);
1039                 } else if (sqp->complete) {
1040
1041                         /*
1042                          * Insert this completed cqe into the swcq.
1043                          */
1044                         PDBG("%s moving cqe into swcq sq idx %ld cq idx %ld\n",
1045                              __FUNCTION__, Q_PTR2IDX(ptr,  wq->sq_size_log2),
1046                              Q_PTR2IDX(cq->sw_wptr, cq->size_log2));
1047                         sqp->cqe.header |= htonl(V_CQE_SWCQE(1));
1048                         *(cq->sw_queue + Q_PTR2IDX(cq->sw_wptr, cq->size_log2))
1049                                 = sqp->cqe;
1050                         cq->sw_wptr++;
1051                         sqp->signaled = 0;
1052                         break;
1053                 } else
1054                         break;
1055 }
1056
1057 static void create_read_req_cqe(struct t3_wq *wq, struct t3_cqe *hw_cqe,
1058                                 struct t3_cqe *read_cqe)
1059 {
1060         read_cqe->u.scqe.wrid_hi = wq->oldest_read->sq_wptr;
1061         read_cqe->len = wq->oldest_read->read_len;
1062         read_cqe->header = htonl(V_CQE_QPID(CQE_QPID(*hw_cqe)) |
1063                                  V_CQE_SWCQE(SW_CQE(*hw_cqe)) |
1064                                  V_CQE_OPCODE(T3_READ_REQ) |
1065                                  V_CQE_TYPE(1));
1066 }
1067
1068 /*
1069  * Return a ptr to the next read wr in the SWSQ or NULL.
1070  */
1071 static void advance_oldest_read(struct t3_wq *wq)
1072 {
1073
1074         u32 rptr = wq->oldest_read - wq->sq + 1;
1075         u32 wptr = Q_PTR2IDX(wq->sq_wptr, wq->sq_size_log2);
1076
1077         while (Q_PTR2IDX(rptr, wq->sq_size_log2) != wptr) {
1078                 wq->oldest_read = wq->sq + Q_PTR2IDX(rptr, wq->sq_size_log2);
1079
1080                 if (wq->oldest_read->opcode == T3_READ_REQ)
1081                         return;
1082                 rptr++;
1083         }
1084         wq->oldest_read = NULL;
1085 }
1086
1087 /*
1088  * cxio_poll_cq
1089  *
1090  * Caller must:
1091  *     check the validity of the first CQE,
1092  *     supply the wq assicated with the qpid.
1093  *
1094  * credit: cq credit to return to sge.
1095  * cqe_flushed: 1 iff the CQE is flushed.
1096  * cqe: copy of the polled CQE.
1097  *
1098  * return value:
1099  *     0       CQE returned,
1100  *    -1       CQE skipped, try again.
1101  */
1102 int cxio_poll_cq(struct t3_wq *wq, struct t3_cq *cq, struct t3_cqe *cqe,
1103                      u8 *cqe_flushed, u64 *cookie, u32 *credit)
1104 {
1105         int ret = 0;
1106         struct t3_cqe *hw_cqe, read_cqe;
1107
1108         *cqe_flushed = 0;
1109         *credit = 0;
1110         hw_cqe = cxio_next_cqe(cq);
1111
1112         PDBG("%s CQE OOO %d qpid 0x%0x genbit %d type %d status 0x%0x"
1113              " opcode 0x%0x len 0x%0x wrid_hi_stag 0x%x wrid_low_msn 0x%x\n",
1114              __FUNCTION__, CQE_OOO(*hw_cqe), CQE_QPID(*hw_cqe),
1115              CQE_GENBIT(*hw_cqe), CQE_TYPE(*hw_cqe), CQE_STATUS(*hw_cqe),
1116              CQE_OPCODE(*hw_cqe), CQE_LEN(*hw_cqe), CQE_WRID_HI(*hw_cqe),
1117              CQE_WRID_LOW(*hw_cqe));
1118
1119         /*
1120          * skip cqe's not affiliated with a QP.
1121          */
1122         if (wq == NULL) {
1123                 ret = -1;
1124                 goto skip_cqe;
1125         }
1126
1127         /*
1128          * Gotta tweak READ completions:
1129          *      1) the cqe doesn't contain the sq_wptr from the wr.
1130          *      2) opcode not reflected from the wr.
1131          *      3) read_len not reflected from the wr.
1132          *      4) cq_type is RQ_TYPE not SQ_TYPE.
1133          */
1134         if (RQ_TYPE(*hw_cqe) && (CQE_OPCODE(*hw_cqe) == T3_READ_RESP)) {
1135
1136                 /*
1137                  * Don't write to the HWCQ, so create a new read req CQE
1138                  * in local memory.
1139                  */
1140                 create_read_req_cqe(wq, hw_cqe, &read_cqe);
1141                 hw_cqe = &read_cqe;
1142                 advance_oldest_read(wq);
1143         }
1144
1145         /*
1146          * T3A: Discard TERMINATE CQEs.
1147          */
1148         if (CQE_OPCODE(*hw_cqe) == T3_TERMINATE) {
1149                 ret = -1;
1150                 wq->error = 1;
1151                 goto skip_cqe;
1152         }
1153
1154         if (CQE_STATUS(*hw_cqe) || wq->error) {
1155                 *cqe_flushed = wq->error;
1156                 wq->error = 1;
1157
1158                 /*
1159                  * T3A inserts errors into the CQE.  We cannot return
1160                  * these as work completions.
1161                  */
1162                 /* incoming write failures */
1163                 if ((CQE_OPCODE(*hw_cqe) == T3_RDMA_WRITE)
1164                      && RQ_TYPE(*hw_cqe)) {
1165                         ret = -1;
1166                         goto skip_cqe;
1167                 }
1168                 /* incoming read request failures */
1169                 if ((CQE_OPCODE(*hw_cqe) == T3_READ_RESP) && SQ_TYPE(*hw_cqe)) {
1170                         ret = -1;
1171                         goto skip_cqe;
1172                 }
1173
1174                 /* incoming SEND with no receive posted failures */
1175                 if ((CQE_OPCODE(*hw_cqe) == T3_SEND) && RQ_TYPE(*hw_cqe) &&
1176                     Q_EMPTY(wq->rq_rptr, wq->rq_wptr)) {
1177                         ret = -1;
1178                         goto skip_cqe;
1179                 }
1180                 goto proc_cqe;
1181         }
1182
1183         /*
1184          * RECV completion.
1185          */
1186         if (RQ_TYPE(*hw_cqe)) {
1187
1188                 /*
1189                  * HW only validates 4 bits of MSN.  So we must validate that
1190                  * the MSN in the SEND is the next expected MSN.  If its not,
1191                  * then we complete this with TPT_ERR_MSN and mark the wq in
1192                  * error.
1193                  */
1194                 if (unlikely((CQE_WRID_MSN(*hw_cqe) != (wq->rq_rptr + 1)))) {
1195                         wq->error = 1;
1196                         hw_cqe->header |= htonl(V_CQE_STATUS(TPT_ERR_MSN));
1197                         goto proc_cqe;
1198                 }
1199                 goto proc_cqe;
1200         }
1201
1202         /*
1203          * If we get here its a send completion.
1204          *
1205          * Handle out of order completion. These get stuffed
1206          * in the SW SQ. Then the SW SQ is walked to move any
1207          * now in-order completions into the SW CQ.  This handles
1208          * 2 cases:
1209          *      1) reaping unsignaled WRs when the first subsequent
1210          *         signaled WR is completed.
1211          *      2) out of order read completions.
1212          */
1213         if (!SW_CQE(*hw_cqe) && (CQE_WRID_SQ_WPTR(*hw_cqe) != wq->sq_rptr)) {
1214                 struct t3_swsq *sqp;
1215
1216                 PDBG("%s out of order completion going in swsq at idx %ld\n",
1217                      __FUNCTION__,
1218                      Q_PTR2IDX(CQE_WRID_SQ_WPTR(*hw_cqe), wq->sq_size_log2));
1219                 sqp = wq->sq +
1220                       Q_PTR2IDX(CQE_WRID_SQ_WPTR(*hw_cqe), wq->sq_size_log2);
1221                 sqp->cqe = *hw_cqe;
1222                 sqp->complete = 1;
1223                 ret = -1;
1224                 goto flush_wq;
1225         }
1226
1227 proc_cqe:
1228         *cqe = *hw_cqe;
1229
1230         /*
1231          * Reap the associated WR(s) that are freed up with this
1232          * completion.
1233          */
1234         if (SQ_TYPE(*hw_cqe)) {
1235                 wq->sq_rptr = CQE_WRID_SQ_WPTR(*hw_cqe);
1236                 PDBG("%s completing sq idx %ld\n", __FUNCTION__,
1237                      Q_PTR2IDX(wq->sq_rptr, wq->sq_size_log2));
1238                 *cookie = (wq->sq +
1239                            Q_PTR2IDX(wq->sq_rptr, wq->sq_size_log2))->wr_id;
1240                 wq->sq_rptr++;
1241         } else {
1242                 PDBG("%s completing rq idx %ld\n", __FUNCTION__,
1243                      Q_PTR2IDX(wq->rq_rptr, wq->rq_size_log2));
1244                 *cookie = *(wq->rq + Q_PTR2IDX(wq->rq_rptr, wq->rq_size_log2));
1245                 wq->rq_rptr++;
1246         }
1247
1248 flush_wq:
1249         /*
1250          * Flush any completed cqes that are now in-order.
1251          */
1252         flush_completed_wrs(wq, cq);
1253
1254 skip_cqe:
1255         if (SW_CQE(*hw_cqe)) {
1256                 PDBG("%s cq %p cqid 0x%x skip sw cqe sw_rptr 0x%x\n",
1257                      __FUNCTION__, cq, cq->cqid, cq->sw_rptr);
1258                 ++cq->sw_rptr;
1259         } else {
1260                 PDBG("%s cq %p cqid 0x%x skip hw cqe rptr 0x%x\n",
1261                      __FUNCTION__, cq, cq->cqid, cq->rptr);
1262                 ++cq->rptr;
1263
1264                 /*
1265                  * T3A: compute credits.
1266                  */
1267                 if (((cq->rptr - cq->wptr) > (1 << (cq->size_log2 - 1)))
1268                     || ((cq->rptr - cq->wptr) >= 128)) {
1269                         *credit = cq->rptr - cq->wptr;
1270                         cq->wptr = cq->rptr;
1271                 }
1272         }
1273         return ret;
1274 }