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 #include <linux/slab.h>
  41 #include <net/net_namespace.h>
  42
  43 #include "cxio_resource.h"
  44 #include "cxio_hal.h"
  45 #include "cxgb3_offload.h"
  46 #include "sge_defs.h"
  47
  48 static LIST_HEAD(rdev_list);
  49 static cxio_hal_ev_callback_func_t cxio_ev_cb = NULL;
  50
  51 static struct cxio_rdev *cxio_hal_find_rdev_by_name(char *dev_name)
  52 {
  53         struct cxio_rdev *rdev;
  54
  55         list_for_each_entry(rdev, &rdev_list, entry)
  56                 if (!strcmp(rdev->dev_name, dev_name))
  57                         return rdev;
  58         return NULL;
  59 }
  60
  61 static struct cxio_rdev *cxio_hal_find_rdev_by_t3cdev(struct t3cdev *tdev)
  62 {
  63         struct cxio_rdev *rdev;
  64
  65         list_for_each_entry(rdev, &rdev_list, entry)
  66                 if (rdev->t3cdev_p == tdev)
  67                         return rdev;
  68         return NULL;
  69 }
  70
  71 int cxio_hal_cq_op(struct cxio_rdev *rdev_p, struct t3_cq *cq,
  72                    enum t3_cq_opcode op, u32 credit)
  73 {
  74         int ret;
  75         struct t3_cqe *cqe;
  76         u32 rptr;
  77
  78         struct rdma_cq_op setup;
  79         setup.id = cq->cqid;
  80         setup.credits = (op == CQ_CREDIT_UPDATE) ? credit : 0;
  81         setup.op = op;
  82         ret = rdev_p->t3cdev_p->ctl(rdev_p->t3cdev_p, RDMA_CQ_OP, &setup);
  83
  84         if ((ret < 0) || (op == CQ_CREDIT_UPDATE))
  85                 return ret;
  86
  87         /*
  88          * If the rearm returned an index other than our current index,
  89          * then there might be CQE's in flight (being DMA'd).  We must wait
  90          * here for them to complete or the consumer can miss a notification.
  91          */
  92         if (Q_PTR2IDX((cq->rptr), cq->size_log2) != ret) {
  93                 int i=0;
  94
  95                 rptr = cq->rptr;
  96
  97                 /*
  98                  * Keep the generation correct by bumping rptr until it
  99                  * matches the index returned by the rearm - 1.
 100                  */
 101                 while (Q_PTR2IDX((rptr+1), cq->size_log2) != ret)
 102                         rptr++;
 103
 104                 /*
 105                  * Now rptr is the index for the (last) cqe that was
 106                  * in-flight at the time the HW rearmed the CQ.  We
 107                  * spin until that CQE is valid.
 108                  */
 109                 cqe = cq->queue + Q_PTR2IDX(rptr, cq->size_log2);
 110                 while (!CQ_VLD_ENTRY(rptr, cq->size_log2, cqe)) {
 111                         udelay(1);
 112                         if (i++ > 1000000) {
 113                                 printk(KERN_ERR "%s: stalled rnic\n",
 114                                        rdev_p->dev_name);
 115                                 return -EIO;
 116                         }
 117                 }
 118
 119                 return 1;
 120         }
 121
 122         return 0;
 123 }
 124
 125 static int cxio_hal_clear_cq_ctx(struct cxio_rdev *rdev_p, u32 cqid)
 126 {
 127         struct rdma_cq_setup setup;
 128         setup.id = cqid;
 129         setup.base_addr = 0;    /* NULL address */
 130         setup.size = 0;         /* disaable the CQ */
 131         setup.credits = 0;
 132         setup.credit_thres = 0;
 133         setup.ovfl_mode = 0;
 134         return (rdev_p->t3cdev_p->ctl(rdev_p->t3cdev_p, RDMA_CQ_SETUP, &setup));
 135 }
 136
 137 static int cxio_hal_clear_qp_ctx(struct cxio_rdev *rdev_p, u32 qpid)
 138 {
 139         u64 sge_cmd;
 140         struct t3_modify_qp_wr *wqe;
 141         struct sk_buff *skb = alloc_skb(sizeof(*wqe), GFP_KERNEL);
 142         if (!skb) {
 143                 PDBG("%s alloc_skb failed\n", __func__);
 144                 return -ENOMEM;
 145         }
 146         wqe = (struct t3_modify_qp_wr *) skb_put(skb, sizeof(*wqe));
 147         memset(wqe, 0, sizeof(*wqe));
 148         build_fw_riwrh((struct fw_riwrh *) wqe, T3_WR_QP_MOD,
 149                        T3_COMPLETION_FLAG | T3_NOTIFY_FLAG, 0, qpid, 7,
 150                        T3_SOPEOP);
 151         wqe->flags = cpu_to_be32(MODQP_WRITE_EC);
 152         sge_cmd = qpid << 8 | 3;
 153         wqe->sge_cmd = cpu_to_be64(sge_cmd);
 154         skb->priority = CPL_PRIORITY_CONTROL;
 155         return iwch_cxgb3_ofld_send(rdev_p->t3cdev_p, skb);
 156 }
 157
 158 int cxio_create_cq(struct cxio_rdev *rdev_p, struct t3_cq *cq, int kernel)
 159 {
 160         struct rdma_cq_setup setup;
 161         int size = (1UL << (cq->size_log2)) * sizeof(struct t3_cqe);
 162
 163         size += 1; /* one extra page for storing cq-in-err state */
 164         cq->cqid = cxio_hal_get_cqid(rdev_p->rscp);
 165         if (!cq->cqid)
 166                 return -ENOMEM;
 167         if (kernel) {
 168                 cq->sw_queue = kzalloc(size, GFP_KERNEL);
 169                 if (!cq->sw_queue)
 170                         return -ENOMEM;
 171         }
 172         cq->queue = dma_alloc_coherent(&(rdev_p->rnic_info.pdev->dev), size,
 173                                              &(cq->dma_addr), GFP_KERNEL);
 174         if (!cq->queue) {
 175                 kfree(cq->sw_queue);
 176                 return -ENOMEM;
 177         }
 178         dma_unmap_addr_set(cq, mapping, cq->dma_addr);
 179         memset(cq->queue, 0, size);
 180         setup.id = cq->cqid;
 181         setup.base_addr = (u64) (cq->dma_addr);
 182         setup.size = 1UL << cq->size_log2;
 183         setup.credits = 65535;
 184         setup.credit_thres = 1;
 185         if (rdev_p->t3cdev_p->type != T3A)
 186                 setup.ovfl_mode = 0;
 187         else
 188                 setup.ovfl_mode = 1;
 189         return (rdev_p->t3cdev_p->ctl(rdev_p->t3cdev_p, RDMA_CQ_SETUP, &setup));
 190 }
 191
 192 int cxio_resize_cq(struct cxio_rdev *rdev_p, struct t3_cq *cq)
 193 {
 194         struct rdma_cq_setup setup;
 195         setup.id = cq->cqid;
 196         setup.base_addr = (u64) (cq->dma_addr);
 197         setup.size = 1UL << cq->size_log2;
 198         setup.credits = setup.size;
 199         setup.credit_thres = setup.size;        /* TBD: overflow recovery */
 200         setup.ovfl_mode = 1;
 201         return (rdev_p->t3cdev_p->ctl(rdev_p->t3cdev_p, RDMA_CQ_SETUP, &setup));
 202 }
 203
 204 static u32 get_qpid(struct cxio_rdev *rdev_p, struct cxio_ucontext *uctx)
 205 {
 206         struct cxio_qpid_list *entry;
 207         u32 qpid;
 208         int i;
 209
 210         mutex_lock(&uctx->lock);
 211         if (!list_empty(&uctx->qpids)) {
 212                 entry = list_entry(uctx->qpids.next, struct cxio_qpid_list,
 213                                    entry);
 214                 list_del(&entry->entry);
 215                 qpid = entry->qpid;
 216                 kfree(entry);
 217         } else {
 218                 qpid = cxio_hal_get_qpid(rdev_p->rscp);
 219                 if (!qpid)
 220                         goto out;
 221                 for (i = qpid+1; i & rdev_p->qpmask; i++) {
 222                         entry = kmalloc(sizeof *entry, GFP_KERNEL);
 223                         if (!entry)
 224                                 break;
 225                         entry->qpid = i;
 226                         list_add_tail(&entry->entry, &uctx->qpids);
 227                 }
 228         }
 229 out:
 230         mutex_unlock(&uctx->lock);
 231         PDBG("%s qpid 0x%x\n", __func__, qpid);
 232         return qpid;
 233 }
 234
 235 static void put_qpid(struct cxio_rdev *rdev_p, u32 qpid,
 236                      struct cxio_ucontext *uctx)
 237 {
 238         struct cxio_qpid_list *entry;
 239
 240         entry = kmalloc(sizeof *entry, GFP_KERNEL);
 241         if (!entry)
 242                 return;
 243         PDBG("%s qpid 0x%x\n", __func__, qpid);
 244         entry->qpid = qpid;
 245         mutex_lock(&uctx->lock);
 246         list_add_tail(&entry->entry, &uctx->qpids);
 247         mutex_unlock(&uctx->lock);
 248 }
 249
 250 void cxio_release_ucontext(struct cxio_rdev *rdev_p, struct cxio_ucontext *uctx)
 251 {
 252         struct list_head *pos, *nxt;
 253         struct cxio_qpid_list *entry;
 254
 255         mutex_lock(&uctx->lock);
 256         list_for_each_safe(pos, nxt, &uctx->qpids) {
 257                 entry = list_entry(pos, struct cxio_qpid_list, entry);
 258                 list_del_init(&entry->entry);
 259                 if (!(entry->qpid & rdev_p->qpmask))
 260                         cxio_hal_put_qpid(rdev_p->rscp, entry->qpid);
 261                 kfree(entry);
 262         }
 263         mutex_unlock(&uctx->lock);
 264 }
 265
 266 void cxio_init_ucontext(struct cxio_rdev *rdev_p, struct cxio_ucontext *uctx)
 267 {
 268         INIT_LIST_HEAD(&uctx->qpids);
 269         mutex_init(&uctx->lock);
 270 }
 271
 272 int cxio_create_qp(struct cxio_rdev *rdev_p, u32 kernel_domain,
 273                    struct t3_wq *wq, struct cxio_ucontext *uctx)
 274 {
 275         int depth = 1UL << wq->size_log2;
 276         int rqsize = 1UL << wq->rq_size_log2;
 277
 278         wq->qpid = get_qpid(rdev_p, uctx);
 279         if (!wq->qpid)
 280                 return -ENOMEM;
 281
 282         wq->rq = kzalloc(depth * sizeof(struct t3_swrq), GFP_KERNEL);
 283         if (!wq->rq)
 284                 goto err1;
 285
 286         wq->rq_addr = cxio_hal_rqtpool_alloc(rdev_p, rqsize);
 287         if (!wq->rq_addr)
 288                 goto err2;
 289
 290         wq->sq = kzalloc(depth * sizeof(struct t3_swsq), GFP_KERNEL);
 291         if (!wq->sq)
 292                 goto err3;
 293
 294         wq->queue = dma_alloc_coherent(&(rdev_p->rnic_info.pdev->dev),
 295                                              depth * sizeof(union t3_wr),
 296                                              &(wq->dma_addr), GFP_KERNEL);
 297         if (!wq->queue)
 298                 goto err4;
 299
 300         memset(wq->queue, 0, depth * sizeof(union t3_wr));
 301         dma_unmap_addr_set(wq, mapping, wq->dma_addr);
 302         wq->doorbell = (void __iomem *)rdev_p->rnic_info.kdb_addr;
 303         if (!kernel_domain)
 304                 wq->udb = (u64)rdev_p->rnic_info.udbell_physbase +
 305                                         (wq->qpid << rdev_p->qpshift);
 306         wq->rdev = rdev_p;
 307         PDBG("%s qpid 0x%x doorbell 0x%p udb 0x%llx\n", __func__,
 308              wq->qpid, wq->doorbell, (unsigned long long) wq->udb);
 309         return 0;
 310 err4:
 311         kfree(wq->sq);
 312 err3:
 313         cxio_hal_rqtpool_free(rdev_p, wq->rq_addr, rqsize);
 314 err2:
 315         kfree(wq->rq);
 316 err1:
 317         put_qpid(rdev_p, wq->qpid, uctx);
 318         return -ENOMEM;
 319 }
 320
 321 int cxio_destroy_cq(struct cxio_rdev *rdev_p, struct t3_cq *cq)
 322 {
 323         int err;
 324         err = cxio_hal_clear_cq_ctx(rdev_p, cq->cqid);
 325         kfree(cq->sw_queue);
 326         dma_free_coherent(&(rdev_p->rnic_info.pdev->dev),
 327                           (1UL << (cq->size_log2))
 328                           * sizeof(struct t3_cqe), cq->queue,
 329                           dma_unmap_addr(cq, mapping));
 330         cxio_hal_put_cqid(rdev_p->rscp, cq->cqid);
 331         return err;
 332 }
 333
 334 int cxio_destroy_qp(struct cxio_rdev *rdev_p, struct t3_wq *wq,
 335                     struct cxio_ucontext *uctx)
 336 {
 337         dma_free_coherent(&(rdev_p->rnic_info.pdev->dev),
 338                           (1UL << (wq->size_log2))
 339                           * sizeof(union t3_wr), wq->queue,
 340                           dma_unmap_addr(wq, mapping));
 341         kfree(wq->sq);
 342         cxio_hal_rqtpool_free(rdev_p, wq->rq_addr, (1UL << wq->rq_size_log2));
 343         kfree(wq->rq);
 344         put_qpid(rdev_p, wq->qpid, uctx);
 345         return 0;
 346 }
 347
 348 static void insert_recv_cqe(struct t3_wq *wq, struct t3_cq *cq)
 349 {
 350         struct t3_cqe cqe;
 351
 352         PDBG("%s wq %p cq %p sw_rptr 0x%x sw_wptr 0x%x\n", __func__,
 353              wq, cq, cq->sw_rptr, cq->sw_wptr);
 354         memset(&cqe, 0, sizeof(cqe));
 355         cqe.header = cpu_to_be32(V_CQE_STATUS(TPT_ERR_SWFLUSH) |
 356                                  V_CQE_OPCODE(T3_SEND) |
 357                                  V_CQE_TYPE(0) |
 358                                  V_CQE_SWCQE(1) |
 359                                  V_CQE_QPID(wq->qpid) |
 360                                  V_CQE_GENBIT(Q_GENBIT(cq->sw_wptr,
 361                                                        cq->size_log2)));
 362         *(cq->sw_queue + Q_PTR2IDX(cq->sw_wptr, cq->size_log2)) = cqe;
 363         cq->sw_wptr++;
 364 }
 365
 366 int cxio_flush_rq(struct t3_wq *wq, struct t3_cq *cq, int count)
 367 {
 368         u32 ptr;
 369         int flushed = 0;
 370
 371         PDBG("%s wq %p cq %p\n", __func__, wq, cq);
 372
 373         /* flush RQ */
 374         PDBG("%s rq_rptr %u rq_wptr %u skip count %u\n", __func__,
 375             wq->rq_rptr, wq->rq_wptr, count);
 376         ptr = wq->rq_rptr + count;
 377         while (ptr++ != wq->rq_wptr) {
 378                 insert_recv_cqe(wq, cq);
 379                 flushed++;
 380         }
 381         return flushed;
 382 }
 383
 384 static void insert_sq_cqe(struct t3_wq *wq, struct t3_cq *cq,
 385                           struct t3_swsq *sqp)
 386 {
 387         struct t3_cqe cqe;
 388
 389         PDBG("%s wq %p cq %p sw_rptr 0x%x sw_wptr 0x%x\n", __func__,
 390              wq, cq, cq->sw_rptr, cq->sw_wptr);
 391         memset(&cqe, 0, sizeof(cqe));
 392         cqe.header = cpu_to_be32(V_CQE_STATUS(TPT_ERR_SWFLUSH) |
 393                                  V_CQE_OPCODE(sqp->opcode) |
 394                                  V_CQE_TYPE(1) |
 395                                  V_CQE_SWCQE(1) |
 396                                  V_CQE_QPID(wq->qpid) |
 397                                  V_CQE_GENBIT(Q_GENBIT(cq->sw_wptr,
 398                                                        cq->size_log2)));
 399         cqe.u.scqe.wrid_hi = sqp->sq_wptr;
 400
 401         *(cq->sw_queue + Q_PTR2IDX(cq->sw_wptr, cq->size_log2)) = cqe;
 402         cq->sw_wptr++;
 403 }
 404
 405 int cxio_flush_sq(struct t3_wq *wq, struct t3_cq *cq, int count)
 406 {
 407         __u32 ptr;
 408         int flushed = 0;
 409         struct t3_swsq *sqp = wq->sq + Q_PTR2IDX(wq->sq_rptr, wq->sq_size_log2);
 410
 411         ptr = wq->sq_rptr + count;
 412         sqp = wq->sq + Q_PTR2IDX(ptr, wq->sq_size_log2);
 413         while (ptr != wq->sq_wptr) {
 414                 sqp->signaled = 0;
 415                 insert_sq_cqe(wq, cq, sqp);
 416                 ptr++;
 417                 sqp = wq->sq + Q_PTR2IDX(ptr, wq->sq_size_log2);
 418                 flushed++;
 419         }
 420         return flushed;
 421 }
 422
 423 /*
 424  * Move all CQEs from the HWCQ into the SWCQ.
 425  */
 426 void cxio_flush_hw_cq(struct t3_cq *cq)
 427 {
 428         struct t3_cqe *cqe, *swcqe;
 429
 430         PDBG("%s cq %p cqid 0x%x\n", __func__, cq, cq->cqid);
 431         cqe = cxio_next_hw_cqe(cq);
 432         while (cqe) {
 433                 PDBG("%s flushing hwcq rptr 0x%x to swcq wptr 0x%x\n",
 434                      __func__, cq->rptr, cq->sw_wptr);
 435                 swcqe = cq->sw_queue + Q_PTR2IDX(cq->sw_wptr, cq->size_log2);
 436                 *swcqe = *cqe;
 437                 swcqe->header |= cpu_to_be32(V_CQE_SWCQE(1));
 438                 cq->sw_wptr++;
 439                 cq->rptr++;
 440                 cqe = cxio_next_hw_cqe(cq);
 441         }
 442 }
 443
 444 static int cqe_completes_wr(struct t3_cqe *cqe, struct t3_wq *wq)
 445 {
 446         if (CQE_OPCODE(*cqe) == T3_TERMINATE)
 447                 return 0;
 448
 449         if ((CQE_OPCODE(*cqe) == T3_RDMA_WRITE) && RQ_TYPE(*cqe))
 450                 return 0;
 451
 452         if ((CQE_OPCODE(*cqe) == T3_READ_RESP) && SQ_TYPE(*cqe))
 453                 return 0;
 454
 455         if (CQE_SEND_OPCODE(*cqe) && RQ_TYPE(*cqe) &&
 456             Q_EMPTY(wq->rq_rptr, wq->rq_wptr))
 457                 return 0;
 458
 459         return 1;
 460 }
 461
 462 void cxio_count_scqes(struct t3_cq *cq, struct t3_wq *wq, int *count)
 463 {
 464         struct t3_cqe *cqe;
 465         u32 ptr;
 466
 467         *count = 0;
 468         ptr = cq->sw_rptr;
 469         while (!Q_EMPTY(ptr, cq->sw_wptr)) {
 470                 cqe = cq->sw_queue + (Q_PTR2IDX(ptr, cq->size_log2));
 471                 if ((SQ_TYPE(*cqe) ||
 472                      ((CQE_OPCODE(*cqe) == T3_READ_RESP) && wq->oldest_read)) &&
 473                     (CQE_QPID(*cqe) == wq->qpid))
 474                         (*count)++;
 475                 ptr++;
 476         }
 477         PDBG("%s cq %p count %d\n", __func__, cq, *count);
 478 }
 479
 480 void cxio_count_rcqes(struct t3_cq *cq, struct t3_wq *wq, int *count)
 481 {
 482         struct t3_cqe *cqe;
 483         u32 ptr;
 484
 485         *count = 0;
 486         PDBG("%s count zero %d\n", __func__, *count);
 487         ptr = cq->sw_rptr;
 488         while (!Q_EMPTY(ptr, cq->sw_wptr)) {
 489                 cqe = cq->sw_queue + (Q_PTR2IDX(ptr, cq->size_log2));
 490                 if (RQ_TYPE(*cqe) && (CQE_OPCODE(*cqe) != T3_READ_RESP) &&
 491                     (CQE_QPID(*cqe) == wq->qpid) && cqe_completes_wr(cqe, wq))
 492                         (*count)++;
 493                 ptr++;
 494         }
 495         PDBG("%s cq %p count %d\n", __func__, cq, *count);
 496 }
 497
 498 static int cxio_hal_init_ctrl_cq(struct cxio_rdev *rdev_p)
 499 {
 500         struct rdma_cq_setup setup;
 501         setup.id = 0;
 502         setup.base_addr = 0;    /* NULL address */
 503         setup.size = 1;         /* enable the CQ */
 504         setup.credits = 0;
 505
 506         /* force SGE to redirect to RspQ and interrupt */
 507         setup.credit_thres = 0;
 508         setup.ovfl_mode = 1;
 509         return (rdev_p->t3cdev_p->ctl(rdev_p->t3cdev_p, RDMA_CQ_SETUP, &setup));
 510 }
 511
 512 static int cxio_hal_init_ctrl_qp(struct cxio_rdev *rdev_p)
 513 {
 514         int err;
 515         u64 sge_cmd, ctx0, ctx1;
 516         u64 base_addr;
 517         struct t3_modify_qp_wr *wqe;
 518         struct sk_buff *skb;
 519
 520         skb = alloc_skb(sizeof(*wqe), GFP_KERNEL);
 521         if (!skb) {
 522                 PDBG("%s alloc_skb failed\n", __func__);
 523                 return -ENOMEM;
 524         }
 525         err = cxio_hal_init_ctrl_cq(rdev_p);
 526         if (err) {
 527                 PDBG("%s err %d initializing ctrl_cq\n", __func__, err);
 528                 goto err;
 529         }
 530         rdev_p->ctrl_qp.workq = dma_alloc_coherent(
 531                                         &(rdev_p->rnic_info.pdev->dev),
 532                                         (1 << T3_CTRL_QP_SIZE_LOG2) *
 533                                         sizeof(union t3_wr),
 534                                         &(rdev_p->ctrl_qp.dma_addr),
 535                                         GFP_KERNEL);
 536         if (!rdev_p->ctrl_qp.workq) {
 537                 PDBG("%s dma_alloc_coherent failed\n", __func__);
 538                 err = -ENOMEM;
 539                 goto err;
 540         }
 541         dma_unmap_addr_set(&rdev_p->ctrl_qp, mapping,
 542                            rdev_p->ctrl_qp.dma_addr);
 543         rdev_p->ctrl_qp.doorbell = (void __iomem *)rdev_p->rnic_info.kdb_addr;
 544         memset(rdev_p->ctrl_qp.workq, 0,
 545                (1 << T3_CTRL_QP_SIZE_LOG2) * sizeof(union t3_wr));
 546
 547         mutex_init(&rdev_p->ctrl_qp.lock);
 548         init_waitqueue_head(&rdev_p->ctrl_qp.waitq);
 549
 550         /* update HW Ctrl QP context */
 551         base_addr = rdev_p->ctrl_qp.dma_addr;
 552         base_addr >>= 12;
 553         ctx0 = (V_EC_SIZE((1 << T3_CTRL_QP_SIZE_LOG2)) |
 554                 V_EC_BASE_LO((u32) base_addr & 0xffff));
 555         ctx0 <<= 32;
 556         ctx0 |= V_EC_CREDITS(FW_WR_NUM);
 557         base_addr >>= 16;
 558         ctx1 = (u32) base_addr;
 559         base_addr >>= 32;
 560         ctx1 |= ((u64) (V_EC_BASE_HI((u32) base_addr & 0xf) | V_EC_RESPQ(0) |
 561                         V_EC_TYPE(0) | V_EC_GEN(1) |
 562                         V_EC_UP_TOKEN(T3_CTL_QP_TID) | F_EC_VALID)) << 32;
 563         wqe = (struct t3_modify_qp_wr *) skb_put(skb, sizeof(*wqe));
 564         memset(wqe, 0, sizeof(*wqe));
 565         build_fw_riwrh((struct fw_riwrh *) wqe, T3_WR_QP_MOD, 0, 0,
 566                        T3_CTL_QP_TID, 7, T3_SOPEOP);
 567         wqe->flags = cpu_to_be32(MODQP_WRITE_EC);
 568         sge_cmd = (3ULL << 56) | FW_RI_SGEEC_START << 8 | 3;
 569         wqe->sge_cmd = cpu_to_be64(sge_cmd);
 570         wqe->ctx1 = cpu_to_be64(ctx1);
 571         wqe->ctx0 = cpu_to_be64(ctx0);
 572         PDBG("CtrlQP dma_addr 0x%llx workq %p size %d\n",
 573              (unsigned long long) rdev_p->ctrl_qp.dma_addr,
 574              rdev_p->ctrl_qp.workq, 1 << T3_CTRL_QP_SIZE_LOG2);
 575         skb->priority = CPL_PRIORITY_CONTROL;
 576         return iwch_cxgb3_ofld_send(rdev_p->t3cdev_p, skb);
 577 err:
 578         kfree_skb(skb);
 579         return err;
 580 }
 581
 582 static int cxio_hal_destroy_ctrl_qp(struct cxio_rdev *rdev_p)
 583 {
 584         dma_free_coherent(&(rdev_p->rnic_info.pdev->dev),
 585                           (1UL << T3_CTRL_QP_SIZE_LOG2)
 586                           * sizeof(union t3_wr), rdev_p->ctrl_qp.workq,
 587                           dma_unmap_addr(&rdev_p->ctrl_qp, mapping));
 588         return cxio_hal_clear_qp_ctx(rdev_p, T3_CTRL_QP_ID);
 589 }
 590
 591 /* write len bytes of data into addr (32B aligned address)
 592  * If data is NULL, clear len byte of memory to zero.
 593  * caller acquires the ctrl_qp lock before the call
 594  */
 595 static int cxio_hal_ctrl_qp_write_mem(struct cxio_rdev *rdev_p, u32 addr,
 596                                       u32 len, void *data)
 597 {
 598         u32 i, nr_wqe, copy_len;
 599         u8 *copy_data;
 600         u8 wr_len, utx_len;     /* length in 8 byte flit */
 601         enum t3_wr_flags flag;
 602         __be64 *wqe;
 603         u64 utx_cmd;
 604         addr &= 0x7FFFFFF;
 605         nr_wqe = len % 96 ? len / 96 + 1 : len / 96;    /* 96B max per WQE */
 606         PDBG("%s wptr 0x%x rptr 0x%x len %d, nr_wqe %d data %p addr 0x%0x\n",
 607              __func__, rdev_p->ctrl_qp.wptr, rdev_p->ctrl_qp.rptr, len,
 608              nr_wqe, data, addr);
 609         utx_len = 3;            /* in 32B unit */
 610         for (i = 0; i < nr_wqe; i++) {
 611                 if (Q_FULL(rdev_p->ctrl_qp.rptr, rdev_p->ctrl_qp.wptr,
 612                            T3_CTRL_QP_SIZE_LOG2)) {
 613                         PDBG("%s ctrl_qp full wtpr 0x%0x rptr 0x%0x, "
 614                              "wait for more space i %d\n", __func__,
 615                              rdev_p->ctrl_qp.wptr, rdev_p->ctrl_qp.rptr, i);
 616                         if (wait_event_interruptible(rdev_p->ctrl_qp.waitq,
 617                                              !Q_FULL(rdev_p->ctrl_qp.rptr,
 618                                                      rdev_p->ctrl_qp.wptr,
 619                                                      T3_CTRL_QP_SIZE_LOG2))) {
 620                                 PDBG("%s ctrl_qp workq interrupted\n",
 621                                      __func__);
 622                                 return -ERESTARTSYS;
 623                         }
 624                         PDBG("%s ctrl_qp wakeup, continue posting work request "
 625                              "i %d\n", __func__, i);
 626                 }
 627                 wqe = (__be64 *)(rdev_p->ctrl_qp.workq + (rdev_p->ctrl_qp.wptr %
 628                                                 (1 << T3_CTRL_QP_SIZE_LOG2)));
 629                 flag = 0;
 630                 if (i == (nr_wqe - 1)) {
 631                         /* last WQE */
 632                         flag = T3_COMPLETION_FLAG;
 633                         if (len % 32)
 634                                 utx_len = len / 32 + 1;
 635                         else
 636                                 utx_len = len / 32;
 637                 }
 638
 639                 /*
 640                  * Force a CQE to return the credit to the workq in case
 641                  * we posted more than half the max QP size of WRs
 642                  */
 643                 if ((i != 0) &&
 644                     (i % (((1 << T3_CTRL_QP_SIZE_LOG2)) >> 1) == 0)) {
 645                         flag = T3_COMPLETION_FLAG;
 646                         PDBG("%s force completion at i %d\n", __func__, i);
 647                 }
 648
 649                 /* build the utx mem command */
 650                 wqe += (sizeof(struct t3_bypass_wr) >> 3);
 651                 utx_cmd = (T3_UTX_MEM_WRITE << 28) | (addr + i * 3);
 652                 utx_cmd <<= 32;
 653                 utx_cmd |= (utx_len << 28) | ((utx_len << 2) + 1);
 654                 *wqe = cpu_to_be64(utx_cmd);
 655                 wqe++;
 656                 copy_data = (u8 *) data + i * 96;
 657                 copy_len = len > 96 ? 96 : len;
 658
 659                 /* clear memory content if data is NULL */
 660                 if (data)
 661                         memcpy(wqe, copy_data, copy_len);
 662                 else
 663                         memset(wqe, 0, copy_len);
 664                 if (copy_len % 32)
 665                         memset(((u8 *) wqe) + copy_len, 0,
 666                                32 - (copy_len % 32));
 667                 wr_len = ((sizeof(struct t3_bypass_wr)) >> 3) + 1 +
 668                          (utx_len << 2);
 669                 wqe = (__be64 *)(rdev_p->ctrl_qp.workq + (rdev_p->ctrl_qp.wptr %
 670                               (1 << T3_CTRL_QP_SIZE_LOG2)));
 671
 672                 /* wptr in the WRID[31:0] */
 673                 ((union t3_wrid *)(wqe+1))->id0.low = rdev_p->ctrl_qp.wptr;
 674
 675                 /*
 676                  * This must be the last write with a memory barrier
 677                  * for the genbit
 678                  */
 679                 build_fw_riwrh((struct fw_riwrh *) wqe, T3_WR_BP, flag,
 680                                Q_GENBIT(rdev_p->ctrl_qp.wptr,
 681                                         T3_CTRL_QP_SIZE_LOG2), T3_CTRL_QP_ID,
 682                                wr_len, T3_SOPEOP);
 683                 if (flag == T3_COMPLETION_FLAG)
 684                         ring_doorbell(rdev_p->ctrl_qp.doorbell, T3_CTRL_QP_ID);
 685                 len -= 96;
 686                 rdev_p->ctrl_qp.wptr++;
 687         }
 688         return 0;
 689 }
 690
 691 /* IN: stag key, pdid, perm, zbva, to, len, page_size, pbl_size and pbl_addr
 692  * OUT: stag index
 693  * TBD: shared memory region support
 694  */
 695 static int __cxio_tpt_op(struct cxio_rdev *rdev_p, u32 reset_tpt_entry,
 696                          u32 *stag, u8 stag_state, u32 pdid,
 697                          enum tpt_mem_type type, enum tpt_mem_perm perm,
 698                          u32 zbva, u64 to, u32 len, u8 page_size,
 699                          u32 pbl_size, u32 pbl_addr)
 700 {
 701         int err;
 702         struct tpt_entry tpt;
 703         u32 stag_idx;
 704         u32 wptr;
 705
 706         if (cxio_fatal_error(rdev_p))
 707                 return -EIO;
 708
 709         stag_state = stag_state > 0;
 710         stag_idx = (*stag) >> 8;
 711
 712         if ((!reset_tpt_entry) && !(*stag != T3_STAG_UNSET)) {
 713                 stag_idx = cxio_hal_get_stag(rdev_p->rscp);
 714                 if (!stag_idx)
 715                         return -ENOMEM;
 716                 *stag = (stag_idx << 8) | ((*stag) & 0xFF);
 717         }
 718         PDBG("%s stag_state 0x%0x type 0x%0x pdid 0x%0x, stag_idx 0x%x\n",
 719              __func__, stag_state, type, pdid, stag_idx);
 720
 721         mutex_lock(&rdev_p->ctrl_qp.lock);
 722
 723         /* write TPT entry */
 724         if (reset_tpt_entry)
 725                 memset(&tpt, 0, sizeof(tpt));
 726         else {
 727                 tpt.valid_stag_pdid = cpu_to_be32(F_TPT_VALID |
 728                                 V_TPT_STAG_KEY((*stag) & M_TPT_STAG_KEY) |
 729                                 V_TPT_STAG_STATE(stag_state) |
 730                                 V_TPT_STAG_TYPE(type) | V_TPT_PDID(pdid));
 731                 BUG_ON(page_size >= 28);
 732                 tpt.flags_pagesize_qpid = cpu_to_be32(V_TPT_PERM(perm) |
 733                         ((perm & TPT_MW_BIND) ? F_TPT_MW_BIND_ENABLE : 0) |
 734                         V_TPT_ADDR_TYPE((zbva ? TPT_ZBTO : TPT_VATO)) |
 735                         V_TPT_PAGE_SIZE(page_size));
 736                 tpt.rsvd_pbl_addr = reset_tpt_entry ? 0 :
 737                                     cpu_to_be32(V_TPT_PBL_ADDR(PBL_OFF(rdev_p, pbl_addr)>>3));
 738                 tpt.len = cpu_to_be32(len);
 739                 tpt.va_hi = cpu_to_be32((u32) (to >> 32));
 740                 tpt.va_low_or_fbo = cpu_to_be32((u32) (to & 0xFFFFFFFFULL));
 741                 tpt.rsvd_bind_cnt_or_pstag = 0;
 742                 tpt.rsvd_pbl_size = reset_tpt_entry ? 0 :
 743                                   cpu_to_be32(V_TPT_PBL_SIZE(pbl_size >> 2));
 744         }
 745         err = cxio_hal_ctrl_qp_write_mem(rdev_p,
 746                                        stag_idx +
 747                                        (rdev_p->rnic_info.tpt_base >> 5),
 748                                        sizeof(tpt), &tpt);
 749
 750         /* release the stag index to free pool */
 751         if (reset_tpt_entry)
 752                 cxio_hal_put_stag(rdev_p->rscp, stag_idx);
 753
 754         wptr = rdev_p->ctrl_qp.wptr;
 755         mutex_unlock(&rdev_p->ctrl_qp.lock);
 756         if (!err)
 757                 if (wait_event_interruptible(rdev_p->ctrl_qp.waitq,
 758                                              SEQ32_GE(rdev_p->ctrl_qp.rptr,
 759                                                       wptr)))
 760                         return -ERESTARTSYS;
 761         return err;
 762 }
 763
 764 int cxio_write_pbl(struct cxio_rdev *rdev_p, __be64 *pbl,
 765                    u32 pbl_addr, u32 pbl_size)
 766 {
 767         u32 wptr;
 768         int err;
 769
 770         PDBG("%s *pdb_addr 0x%x, pbl_base 0x%x, pbl_size %d\n",
 771              __func__, pbl_addr, rdev_p->rnic_info.pbl_base,
 772              pbl_size);
 773
 774         mutex_lock(&rdev_p->ctrl_qp.lock);
 775         err = cxio_hal_ctrl_qp_write_mem(rdev_p, pbl_addr >> 5, pbl_size << 3,
 776                                          pbl);
 777         wptr = rdev_p->ctrl_qp.wptr;
 778         mutex_unlock(&rdev_p->ctrl_qp.lock);
 779         if (err)
 780                 return err;
 781
 782         if (wait_event_interruptible(rdev_p->ctrl_qp.waitq,
 783                                      SEQ32_GE(rdev_p->ctrl_qp.rptr,
 784                                               wptr)))
 785                 return -ERESTARTSYS;
 786
 787         return 0;
 788 }
 789
 790 int cxio_register_phys_mem(struct cxio_rdev *rdev_p, u32 *stag, u32 pdid,
 791                            enum tpt_mem_perm perm, u32 zbva, u64 to, u32 len,
 792                            u8 page_size, u32 pbl_size, u32 pbl_addr)
 793 {
 794         *stag = T3_STAG_UNSET;
 795         return __cxio_tpt_op(rdev_p, 0, stag, 1, pdid, TPT_NON_SHARED_MR, perm,
 796                              zbva, to, len, page_size, pbl_size, pbl_addr);
 797 }
 798
 799 int cxio_reregister_phys_mem(struct cxio_rdev *rdev_p, u32 *stag, u32 pdid,
 800                            enum tpt_mem_perm perm, u32 zbva, u64 to, u32 len,
 801                            u8 page_size, u32 pbl_size, u32 pbl_addr)
 802 {
 803         return __cxio_tpt_op(rdev_p, 0, stag, 1, pdid, TPT_NON_SHARED_MR, perm,
 804                              zbva, to, len, page_size, pbl_size, pbl_addr);
 805 }
 806
 807 int cxio_dereg_mem(struct cxio_rdev *rdev_p, u32 stag, u32 pbl_size,
 808                    u32 pbl_addr)
 809 {
 810         return __cxio_tpt_op(rdev_p, 1, &stag, 0, 0, 0, 0, 0, 0ULL, 0, 0,
 811                              pbl_size, pbl_addr);
 812 }
 813
 814 int cxio_allocate_window(struct cxio_rdev *rdev_p, u32 * stag, u32 pdid)
 815 {
 816         *stag = T3_STAG_UNSET;
 817         return __cxio_tpt_op(rdev_p, 0, stag, 0, pdid, TPT_MW, 0, 0, 0ULL, 0, 0,
 818                              0, 0);
 819 }
 820
 821 int cxio_deallocate_window(struct cxio_rdev *rdev_p, u32 stag)
 822 {
 823         return __cxio_tpt_op(rdev_p, 1, &stag, 0, 0, 0, 0, 0, 0ULL, 0, 0,
 824                              0, 0);
 825 }
 826
 827 int cxio_allocate_stag(struct cxio_rdev *rdev_p, u32 *stag, u32 pdid, u32 pbl_size, u32 pbl_addr)
 828 {
 829         *stag = T3_STAG_UNSET;
 830         return __cxio_tpt_op(rdev_p, 0, stag, 0, pdid, TPT_NON_SHARED_MR,
 831                              0, 0, 0ULL, 0, 0, pbl_size, pbl_addr);
 832 }
 833
 834 int cxio_rdma_init(struct cxio_rdev *rdev_p, struct t3_rdma_init_attr *attr)
 835 {
 836         struct t3_rdma_init_wr *wqe;
 837         struct sk_buff *skb = alloc_skb(sizeof(*wqe), GFP_ATOMIC);
 838         if (!skb)
 839                 return -ENOMEM;
 840         PDBG("%s rdev_p %p\n", __func__, rdev_p);
 841         wqe = (struct t3_rdma_init_wr *) __skb_put(skb, sizeof(*wqe));
 842         wqe->wrh.op_seop_flags = cpu_to_be32(V_FW_RIWR_OP(T3_WR_INIT));
 843         wqe->wrh.gen_tid_len = cpu_to_be32(V_FW_RIWR_TID(attr->tid) |
 844                                            V_FW_RIWR_LEN(sizeof(*wqe) >> 3));
 845         wqe->wrid.id1 = 0;
 846         wqe->qpid = cpu_to_be32(attr->qpid);
 847         wqe->pdid = cpu_to_be32(attr->pdid);
 848         wqe->scqid = cpu_to_be32(attr->scqid);
 849         wqe->rcqid = cpu_to_be32(attr->rcqid);
 850         wqe->rq_addr = cpu_to_be32(attr->rq_addr - rdev_p->rnic_info.rqt_base);
 851         wqe->rq_size = cpu_to_be32(attr->rq_size);
 852         wqe->mpaattrs = attr->mpaattrs;
 853         wqe->qpcaps = attr->qpcaps;
 854         wqe->ulpdu_size = cpu_to_be16(attr->tcp_emss);
 855         wqe->rqe_count = cpu_to_be16(attr->rqe_count);
 856         wqe->flags_rtr_type = cpu_to_be16(attr->flags |
 857                                           V_RTR_TYPE(attr->rtr_type) |
 858                                           V_CHAN(attr->chan));
 859         wqe->ord = cpu_to_be32(attr->ord);
 860         wqe->ird = cpu_to_be32(attr->ird);
 861         wqe->qp_dma_addr = cpu_to_be64(attr->qp_dma_addr);
 862         wqe->qp_dma_size = cpu_to_be32(attr->qp_dma_size);
 863         wqe->irs = cpu_to_be32(attr->irs);
 864         skb->priority = 0;      /* 0=>ToeQ; 1=>CtrlQ */
 865         return iwch_cxgb3_ofld_send(rdev_p->t3cdev_p, skb);
 866 }
 867
 868 void cxio_register_ev_cb(cxio_hal_ev_callback_func_t ev_cb)
 869 {
 870         cxio_ev_cb = ev_cb;
 871 }
 872
 873 void cxio_unregister_ev_cb(cxio_hal_ev_callback_func_t ev_cb)
 874 {
 875         cxio_ev_cb = NULL;
 876 }
 877
 878 static int cxio_hal_ev_handler(struct t3cdev *t3cdev_p, struct sk_buff *skb)
 879 {
 880         static int cnt;
 881         struct cxio_rdev *rdev_p = NULL;
 882         struct respQ_msg_t *rsp_msg = (struct respQ_msg_t *) skb->data;
 883         PDBG("%d: %s cq_id 0x%x cq_ptr 0x%x genbit %0x overflow %0x an %0x"
 884              " se %0x notify %0x cqbranch %0x creditth %0x\n",
 885              cnt, __func__, RSPQ_CQID(rsp_msg), RSPQ_CQPTR(rsp_msg),
 886              RSPQ_GENBIT(rsp_msg), RSPQ_OVERFLOW(rsp_msg), RSPQ_AN(rsp_msg),
 887              RSPQ_SE(rsp_msg), RSPQ_NOTIFY(rsp_msg), RSPQ_CQBRANCH(rsp_msg),
 888              RSPQ_CREDIT_THRESH(rsp_msg));
 889         PDBG("CQE: QPID 0x%0x genbit %0x type 0x%0x status 0x%0x opcode %d "
 890              "len 0x%0x wrid_hi_stag 0x%x wrid_low_msn 0x%x\n",
 891              CQE_QPID(rsp_msg->cqe), CQE_GENBIT(rsp_msg->cqe),
 892              CQE_TYPE(rsp_msg->cqe), CQE_STATUS(rsp_msg->cqe),
 893              CQE_OPCODE(rsp_msg->cqe), CQE_LEN(rsp_msg->cqe),
 894              CQE_WRID_HI(rsp_msg->cqe), CQE_WRID_LOW(rsp_msg->cqe));
 895         rdev_p = (struct cxio_rdev *)t3cdev_p->ulp;
 896         if (!rdev_p) {
 897                 PDBG("%s called by t3cdev %p with null ulp\n", __func__,
 898                      t3cdev_p);
 899                 return 0;
 900         }
 901         if (CQE_QPID(rsp_msg->cqe) == T3_CTRL_QP_ID) {
 902                 rdev_p->ctrl_qp.rptr = CQE_WRID_LOW(rsp_msg->cqe) + 1;
 903                 wake_up_interruptible(&rdev_p->ctrl_qp.waitq);
 904                 dev_kfree_skb_irq(skb);
 905         } else if (CQE_QPID(rsp_msg->cqe) == 0xfff8)
 906                 dev_kfree_skb_irq(skb);
 907         else if (cxio_ev_cb)
 908                 (*cxio_ev_cb) (rdev_p, skb);
 909         else
 910                 dev_kfree_skb_irq(skb);
 911         cnt++;
 912         return 0;
 913 }
 914
 915 /* Caller takes care of locking if needed */
 916 int cxio_rdev_open(struct cxio_rdev *rdev_p)
 917 {
 918         struct net_device *netdev_p = NULL;
 919         int err = 0;
 920         if (strlen(rdev_p->dev_name)) {
 921                 if (cxio_hal_find_rdev_by_name(rdev_p->dev_name)) {
 922                         return -EBUSY;
 923                 }
 924                 netdev_p = dev_get_by_name(&init_net, rdev_p->dev_name);
 925                 if (!netdev_p) {
 926                         return -EINVAL;
 927                 }
 928                 dev_put(netdev_p);
 929         } else if (rdev_p->t3cdev_p) {
 930                 if (cxio_hal_find_rdev_by_t3cdev(rdev_p->t3cdev_p)) {
 931                         return -EBUSY;
 932                 }
 933                 netdev_p = rdev_p->t3cdev_p->lldev;
 934                 strncpy(rdev_p->dev_name, rdev_p->t3cdev_p->name,
 935                         T3_MAX_DEV_NAME_LEN);
 936         } else {
 937                 PDBG("%s t3cdev_p or dev_name must be set\n", __func__);
 938                 return -EINVAL;
 939         }
 940
 941         list_add_tail(&rdev_p->entry, &rdev_list);
 942
 943         PDBG("%s opening rnic dev %s\n", __func__, rdev_p->dev_name);
 944         memset(&rdev_p->ctrl_qp, 0, sizeof(rdev_p->ctrl_qp));
 945         if (!rdev_p->t3cdev_p)
 946                 rdev_p->t3cdev_p = dev2t3cdev(netdev_p);
 947         rdev_p->t3cdev_p->ulp = (void *) rdev_p;
 948
 949         err = rdev_p->t3cdev_p->ctl(rdev_p->t3cdev_p, GET_EMBEDDED_INFO,
 950                                          &(rdev_p->fw_info));
 951         if (err) {
 952                 printk(KERN_ERR "%s t3cdev_p(%p)->ctl returned error %d.\n",
 953                      __func__, rdev_p->t3cdev_p, err);
 954                 goto err1;
 955         }
 956         if (G_FW_VERSION_MAJOR(rdev_p->fw_info.fw_vers) != CXIO_FW_MAJ) {
 957                 printk(KERN_ERR MOD "fatal firmware version mismatch: "
 958                        "need version %u but adapter has version %u\n",
 959                        CXIO_FW_MAJ,
 960                        G_FW_VERSION_MAJOR(rdev_p->fw_info.fw_vers));
 961                 err = -EINVAL;
 962                 goto err1;
 963         }
 964
 965         err = rdev_p->t3cdev_p->ctl(rdev_p->t3cdev_p, RDMA_GET_PARAMS,
 966                                          &(rdev_p->rnic_info));
 967         if (err) {
 968                 printk(KERN_ERR "%s t3cdev_p(%p)->ctl returned error %d.\n",
 969                      __func__, rdev_p->t3cdev_p, err);
 970                 goto err1;
 971         }
 972         err = rdev_p->t3cdev_p->ctl(rdev_p->t3cdev_p, GET_PORTS,
 973                                     &(rdev_p->port_info));
 974         if (err) {
 975                 printk(KERN_ERR "%s t3cdev_p(%p)->ctl returned error %d.\n",
 976                      __func__, rdev_p->t3cdev_p, err);
 977                 goto err1;
 978         }
 979
 980         /*
 981          * qpshift is the number of bits to shift the qpid left in order
 982          * to get the correct address of the doorbell for that qp.
 983          */
 984         cxio_init_ucontext(rdev_p, &rdev_p->uctx);
 985         rdev_p->qpshift = PAGE_SHIFT -
 986                           ilog2(65536 >>
 987                                     ilog2(rdev_p->rnic_info.udbell_len >>
 988                                               PAGE_SHIFT));
 989         rdev_p->qpnr = rdev_p->rnic_info.udbell_len >> PAGE_SHIFT;
 990         rdev_p->qpmask = (65536 >> ilog2(rdev_p->qpnr)) - 1;
 991         PDBG("%s rnic %s info: tpt_base 0x%0x tpt_top 0x%0x num stags %d "
 992              "pbl_base 0x%0x pbl_top 0x%0x rqt_base 0x%0x, rqt_top 0x%0x\n",
 993              __func__, rdev_p->dev_name, rdev_p->rnic_info.tpt_base,
 994              rdev_p->rnic_info.tpt_top, cxio_num_stags(rdev_p),
 995              rdev_p->rnic_info.pbl_base,
 996              rdev_p->rnic_info.pbl_top, rdev_p->rnic_info.rqt_base,
 997              rdev_p->rnic_info.rqt_top);
 998         PDBG("udbell_len 0x%0x udbell_physbase 0x%lx kdb_addr %p qpshift %lu "
 999              "qpnr %d qpmask 0x%x\n",
1000              rdev_p->rnic_info.udbell_len,
1001              rdev_p->rnic_info.udbell_physbase, rdev_p->rnic_info.kdb_addr,
1002              rdev_p->qpshift, rdev_p->qpnr, rdev_p->qpmask);
1003
1004         err = cxio_hal_init_ctrl_qp(rdev_p);
1005         if (err) {
1006                 printk(KERN_ERR "%s error %d initializing ctrl_qp.\n",
1007                        __func__, err);
1008                 goto err1;
1009         }
1010         err = cxio_hal_init_resource(rdev_p, cxio_num_stags(rdev_p), 0,
1011                                      0, T3_MAX_NUM_QP, T3_MAX_NUM_CQ,
1012                                      T3_MAX_NUM_PD);
1013         if (err) {
1014                 printk(KERN_ERR "%s error %d initializing hal resources.\n",
1015                        __func__, err);
1016                 goto err2;
1017         }
1018         err = cxio_hal_pblpool_create(rdev_p);
1019         if (err) {
1020                 printk(KERN_ERR "%s error %d initializing pbl mem pool.\n",
1021                        __func__, err);
1022                 goto err3;
1023         }
1024         err = cxio_hal_rqtpool_create(rdev_p);
1025         if (err) {
1026                 printk(KERN_ERR "%s error %d initializing rqt mem pool.\n",
1027                        __func__, err);
1028                 goto err4;
1029         }
1030         return 0;
1031 err4:
1032         cxio_hal_pblpool_destroy(rdev_p);
1033 err3:
1034         cxio_hal_destroy_resource(rdev_p->rscp);
1035 err2:
1036         cxio_hal_destroy_ctrl_qp(rdev_p);
1037 err1:
1038         rdev_p->t3cdev_p->ulp = NULL;
1039         list_del(&rdev_p->entry);
1040         return err;
1041 }
1042
1043 void cxio_rdev_close(struct cxio_rdev *rdev_p)
1044 {
1045         if (rdev_p) {
1046                 cxio_hal_pblpool_destroy(rdev_p);
1047                 cxio_hal_rqtpool_destroy(rdev_p);
1048                 list_del(&rdev_p->entry);
1049                 cxio_hal_destroy_ctrl_qp(rdev_p);
1050                 cxio_hal_destroy_resource(rdev_p->rscp);
1051                 rdev_p->t3cdev_p->ulp = NULL;
1052         }
1053 }
1054
1055 int __init cxio_hal_init(void)
1056 {
1057         if (cxio_hal_init_rhdl_resource(T3_MAX_NUM_RI))
1058                 return -ENOMEM;
1059         t3_register_cpl_handler(CPL_ASYNC_NOTIF, cxio_hal_ev_handler);
1060         return 0;
1061 }
1062
1063 void __exit cxio_hal_exit(void)
1064 {
1065         struct cxio_rdev *rdev, *tmp;
1066
1067         t3_register_cpl_handler(CPL_ASYNC_NOTIF, NULL);
1068         list_for_each_entry_safe(rdev, tmp, &rdev_list, entry)
1069                 cxio_rdev_close(rdev);
1070         cxio_hal_destroy_rhdl_resource();
1071 }
1072
1073 static void flush_completed_wrs(struct t3_wq *wq, struct t3_cq *cq)
1074 {
1075         struct t3_swsq *sqp;
1076         __u32 ptr = wq->sq_rptr;
1077         int count = Q_COUNT(wq->sq_rptr, wq->sq_wptr);
1078
1079         sqp = wq->sq + Q_PTR2IDX(ptr, wq->sq_size_log2);
1080         while (count--)
1081                 if (!sqp->signaled) {
1082                         ptr++;
1083                         sqp = wq->sq + Q_PTR2IDX(ptr,  wq->sq_size_log2);
1084                 } else if (sqp->complete) {
1085
1086                         /*
1087                          * Insert this completed cqe into the swcq.
1088                          */
1089                         PDBG("%s moving cqe into swcq sq idx %ld cq idx %ld\n",
1090                              __func__, Q_PTR2IDX(ptr,  wq->sq_size_log2),
1091                              Q_PTR2IDX(cq->sw_wptr, cq->size_log2));
1092                         sqp->cqe.header |= htonl(V_CQE_SWCQE(1));
1093                         *(cq->sw_queue + Q_PTR2IDX(cq->sw_wptr, cq->size_log2))
1094                                 = sqp->cqe;
1095                         cq->sw_wptr++;
1096                         sqp->signaled = 0;
1097                         break;
1098                 } else
1099                         break;
1100 }
1101
1102 static void create_read_req_cqe(struct t3_wq *wq, struct t3_cqe *hw_cqe,
1103                                 struct t3_cqe *read_cqe)
1104 {
1105         read_cqe->u.scqe.wrid_hi = wq->oldest_read->sq_wptr;
1106         read_cqe->len = wq->oldest_read->read_len;
1107         read_cqe->header = htonl(V_CQE_QPID(CQE_QPID(*hw_cqe)) |
1108                                  V_CQE_SWCQE(SW_CQE(*hw_cqe)) |
1109                                  V_CQE_OPCODE(T3_READ_REQ) |
1110                                  V_CQE_TYPE(1));
1111 }
1112
1113 /*
1114  * Return a ptr to the next read wr in the SWSQ or NULL.
1115  */
1116 static void advance_oldest_read(struct t3_wq *wq)
1117 {
1118
1119         u32 rptr = wq->oldest_read - wq->sq + 1;
1120         u32 wptr = Q_PTR2IDX(wq->sq_wptr, wq->sq_size_log2);
1121
1122         while (Q_PTR2IDX(rptr, wq->sq_size_log2) != wptr) {
1123                 wq->oldest_read = wq->sq + Q_PTR2IDX(rptr, wq->sq_size_log2);
1124
1125                 if (wq->oldest_read->opcode == T3_READ_REQ)
1126                         return;
1127                 rptr++;
1128         }
1129         wq->oldest_read = NULL;
1130 }
1131
1132 /*
1133  * cxio_poll_cq
1134  *
1135  * Caller must:
1136  *     check the validity of the first CQE,
1137  *     supply the wq assicated with the qpid.
1138  *
1139  * credit: cq credit to return to sge.
1140  * cqe_flushed: 1 iff the CQE is flushed.
1141  * cqe: copy of the polled CQE.
1142  *
1143  * return value:
1144  *     0       CQE returned,
1145  *    -1       CQE skipped, try again.
1146  */
1147 int cxio_poll_cq(struct t3_wq *wq, struct t3_cq *cq, struct t3_cqe *cqe,
1148                      u8 *cqe_flushed, u64 *cookie, u32 *credit)
1149 {
1150         int ret = 0;
1151         struct t3_cqe *hw_cqe, read_cqe;
1152
1153         *cqe_flushed = 0;
1154         *credit = 0;
1155         hw_cqe = cxio_next_cqe(cq);
1156
1157         PDBG("%s CQE OOO %d qpid 0x%0x genbit %d type %d status 0x%0x"
1158              " opcode 0x%0x len 0x%0x wrid_hi_stag 0x%x wrid_low_msn 0x%x\n",
1159              __func__, CQE_OOO(*hw_cqe), CQE_QPID(*hw_cqe),
1160              CQE_GENBIT(*hw_cqe), CQE_TYPE(*hw_cqe), CQE_STATUS(*hw_cqe),
1161              CQE_OPCODE(*hw_cqe), CQE_LEN(*hw_cqe), CQE_WRID_HI(*hw_cqe),
1162              CQE_WRID_LOW(*hw_cqe));
1163
1164         /*
1165          * skip cqe's not affiliated with a QP.
1166          */
1167         if (wq == NULL) {
1168                 ret = -1;
1169                 goto skip_cqe;
1170         }
1171
1172         /*
1173          * Gotta tweak READ completions:
1174          *      1) the cqe doesn't contain the sq_wptr from the wr.
1175          *      2) opcode not reflected from the wr.
1176          *      3) read_len not reflected from the wr.
1177          *      4) cq_type is RQ_TYPE not SQ_TYPE.
1178          */
1179         if (RQ_TYPE(*hw_cqe) && (CQE_OPCODE(*hw_cqe) == T3_READ_RESP)) {
1180
1181                 /*
1182                  * If this is an unsolicited read response, then the read
1183                  * was generated by the kernel driver as part of peer-2-peer
1184                  * connection setup.  So ignore the completion.
1185                  */
1186                 if (!wq->oldest_read) {
1187                         if (CQE_STATUS(*hw_cqe))
1188                                 wq->error = 1;
1189                         ret = -1;
1190                         goto skip_cqe;
1191                 }
1192
1193                 /*
1194                  * Don't write to the HWCQ, so create a new read req CQE
1195                  * in local memory.
1196                  */
1197                 create_read_req_cqe(wq, hw_cqe, &read_cqe);
1198                 hw_cqe = &read_cqe;
1199                 advance_oldest_read(wq);
1200         }
1201
1202         /*
1203          * T3A: Discard TERMINATE CQEs.
1204          */
1205         if (CQE_OPCODE(*hw_cqe) == T3_TERMINATE) {
1206                 ret = -1;
1207                 wq->error = 1;
1208                 goto skip_cqe;
1209         }
1210
1211         if (CQE_STATUS(*hw_cqe) || wq->error) {
1212                 *cqe_flushed = wq->error;
1213                 wq->error = 1;
1214
1215                 /*
1216                  * T3A inserts errors into the CQE.  We cannot return
1217                  * these as work completions.
1218                  */
1219                 /* incoming write failures */
1220                 if ((CQE_OPCODE(*hw_cqe) == T3_RDMA_WRITE)
1221                      && RQ_TYPE(*hw_cqe)) {
1222                         ret = -1;
1223                         goto skip_cqe;
1224                 }
1225                 /* incoming read request failures */
1226                 if ((CQE_OPCODE(*hw_cqe) == T3_READ_RESP) && SQ_TYPE(*hw_cqe)) {
1227                         ret = -1;
1228                         goto skip_cqe;
1229                 }
1230
1231                 /* incoming SEND with no receive posted failures */
1232                 if (CQE_SEND_OPCODE(*hw_cqe) && RQ_TYPE(*hw_cqe) &&
1233                     Q_EMPTY(wq->rq_rptr, wq->rq_wptr)) {
1234                         ret = -1;
1235                         goto skip_cqe;
1236                 }
1237                 BUG_ON((*cqe_flushed == 0) && !SW_CQE(*hw_cqe));
1238                 goto proc_cqe;
1239         }
1240
1241         /*
1242          * RECV completion.
1243          */
1244         if (RQ_TYPE(*hw_cqe)) {
1245
1246                 /*
1247                  * HW only validates 4 bits of MSN.  So we must validate that
1248                  * the MSN in the SEND is the next expected MSN.  If its not,
1249                  * then we complete this with TPT_ERR_MSN and mark the wq in
1250                  * error.
1251                  */
1252
1253                 if (Q_EMPTY(wq->rq_rptr, wq->rq_wptr)) {
1254                         wq->error = 1;
1255                         ret = -1;
1256                         goto skip_cqe;
1257                 }
1258
1259                 if (unlikely((CQE_WRID_MSN(*hw_cqe) != (wq->rq_rptr + 1)))) {
1260                         wq->error = 1;
1261                         hw_cqe->header |= htonl(V_CQE_STATUS(TPT_ERR_MSN));
1262                         goto proc_cqe;
1263                 }
1264                 goto proc_cqe;
1265         }
1266
1267         /*
1268          * If we get here its a send completion.
1269          *
1270          * Handle out of order completion. These get stuffed
1271          * in the SW SQ. Then the SW SQ is walked to move any
1272          * now in-order completions into the SW CQ.  This handles
1273          * 2 cases:
1274          *      1) reaping unsignaled WRs when the first subsequent
1275          *         signaled WR is completed.
1276          *      2) out of order read completions.
1277          */
1278         if (!SW_CQE(*hw_cqe) && (CQE_WRID_SQ_WPTR(*hw_cqe) != wq->sq_rptr)) {
1279                 struct t3_swsq *sqp;
1280
1281                 PDBG("%s out of order completion going in swsq at idx %ld\n",
1282                      __func__,
1283                      Q_PTR2IDX(CQE_WRID_SQ_WPTR(*hw_cqe), wq->sq_size_log2));
1284                 sqp = wq->sq +
1285                       Q_PTR2IDX(CQE_WRID_SQ_WPTR(*hw_cqe), wq->sq_size_log2);
1286                 sqp->cqe = *hw_cqe;
1287                 sqp->complete = 1;
1288                 ret = -1;
1289                 goto flush_wq;
1290         }
1291
1292 proc_cqe:
1293         *cqe = *hw_cqe;
1294
1295         /*
1296          * Reap the associated WR(s) that are freed up with this
1297          * completion.
1298          */
1299         if (SQ_TYPE(*hw_cqe)) {
1300                 wq->sq_rptr = CQE_WRID_SQ_WPTR(*hw_cqe);
1301                 PDBG("%s completing sq idx %ld\n", __func__,
1302                      Q_PTR2IDX(wq->sq_rptr, wq->sq_size_log2));
1303                 *cookie = wq->sq[Q_PTR2IDX(wq->sq_rptr, wq->sq_size_log2)].wr_id;
1304                 wq->sq_rptr++;
1305         } else {
1306                 PDBG("%s completing rq idx %ld\n", __func__,
1307                      Q_PTR2IDX(wq->rq_rptr, wq->rq_size_log2));
1308                 *cookie = wq->rq[Q_PTR2IDX(wq->rq_rptr, wq->rq_size_log2)].wr_id;
1309                 if (wq->rq[Q_PTR2IDX(wq->rq_rptr, wq->rq_size_log2)].pbl_addr)
1310                         cxio_hal_pblpool_free(wq->rdev,
1311                                 wq->rq[Q_PTR2IDX(wq->rq_rptr,
1312                                 wq->rq_size_log2)].pbl_addr, T3_STAG0_PBL_SIZE);
1313                 BUG_ON(Q_EMPTY(wq->rq_rptr, wq->rq_wptr));
1314                 wq->rq_rptr++;
1315         }
1316
1317 flush_wq:
1318         /*
1319          * Flush any completed cqes that are now in-order.
1320          */
1321         flush_completed_wrs(wq, cq);
1322
1323 skip_cqe:
1324         if (SW_CQE(*hw_cqe)) {
1325                 PDBG("%s cq %p cqid 0x%x skip sw cqe sw_rptr 0x%x\n",
1326                      __func__, cq, cq->cqid, cq->sw_rptr);
1327                 ++cq->sw_rptr;
1328         } else {
1329                 PDBG("%s cq %p cqid 0x%x skip hw cqe rptr 0x%x\n",
1330                      __func__, cq, cq->cqid, cq->rptr);
1331                 ++cq->rptr;
1332
1333                 /*
1334                  * T3A: compute credits.
1335                  */
1336                 if (((cq->rptr - cq->wptr) > (1 << (cq->size_log2 - 1)))
1337                     || ((cq->rptr - cq->wptr) >= 128)) {
1338                         *credit = cq->rptr - cq->wptr;
1339                         cq->wptr = cq->rptr;
1340                 }
1341         }
1342         return ret;
1343 }