2 * Copyright (c) 2006 Chelsio, Inc. All rights reserved.
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:
10 * Redistribution and use in source and binary forms, with or
11 * without modification, are permitted provided that the following
14 * - Redistributions of source code must retain the above
15 * copyright notice, this list of conditions and the following
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.
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
32 #include <asm/delay.h>
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 <net/net_namespace.h>
42 #include "cxio_resource.h"
44 #include "cxgb3_offload.h"
47 static LIST_HEAD(rdev_list);
48 static cxio_hal_ev_callback_func_t cxio_ev_cb = NULL;
50 static struct cxio_rdev *cxio_hal_find_rdev_by_name(char *dev_name)
52 struct cxio_rdev *rdev;
54 list_for_each_entry(rdev, &rdev_list, entry)
55 if (!strcmp(rdev->dev_name, dev_name))
60 static struct cxio_rdev *cxio_hal_find_rdev_by_t3cdev(struct t3cdev *tdev)
62 struct cxio_rdev *rdev;
64 list_for_each_entry(rdev, &rdev_list, entry)
65 if (rdev->t3cdev_p == tdev)
70 int cxio_hal_cq_op(struct cxio_rdev *rdev_p, struct t3_cq *cq,
71 enum t3_cq_opcode op, u32 credit)
77 struct rdma_cq_op setup;
79 setup.credits = (op == CQ_CREDIT_UPDATE) ? credit : 0;
81 ret = rdev_p->t3cdev_p->ctl(rdev_p->t3cdev_p, RDMA_CQ_OP, &setup);
83 if ((ret < 0) || (op == CQ_CREDIT_UPDATE))
87 * If the rearm returned an index other than our current index,
88 * then there might be CQE's in flight (being DMA'd). We must wait
89 * here for them to complete or the consumer can miss a notification.
91 if (Q_PTR2IDX((cq->rptr), cq->size_log2) != ret) {
97 * Keep the generation correct by bumping rptr until it
98 * matches the index returned by the rearm - 1.
100 while (Q_PTR2IDX((rptr+1), cq->size_log2) != ret)
104 * Now rptr is the index for the (last) cqe that was
105 * in-flight at the time the HW rearmed the CQ. We
106 * spin until that CQE is valid.
108 cqe = cq->queue + Q_PTR2IDX(rptr, cq->size_log2);
109 while (!CQ_VLD_ENTRY(rptr, cq->size_log2, cqe)) {
112 printk(KERN_ERR "%s: stalled rnic\n",
124 static int cxio_hal_clear_cq_ctx(struct cxio_rdev *rdev_p, u32 cqid)
126 struct rdma_cq_setup setup;
128 setup.base_addr = 0; /* NULL address */
129 setup.size = 0; /* disaable the CQ */
131 setup.credit_thres = 0;
133 return (rdev_p->t3cdev_p->ctl(rdev_p->t3cdev_p, RDMA_CQ_SETUP, &setup));
136 static int cxio_hal_clear_qp_ctx(struct cxio_rdev *rdev_p, u32 qpid)
139 struct t3_modify_qp_wr *wqe;
140 struct sk_buff *skb = alloc_skb(sizeof(*wqe), GFP_KERNEL);
142 PDBG("%s alloc_skb failed\n", __func__);
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,
148 T3_COMPLETION_FLAG | T3_NOTIFY_FLAG, 0, qpid, 7,
150 wqe->flags = cpu_to_be32(MODQP_WRITE_EC);
151 sge_cmd = qpid << 8 | 3;
152 wqe->sge_cmd = cpu_to_be64(sge_cmd);
153 skb->priority = CPL_PRIORITY_CONTROL;
154 return iwch_cxgb3_ofld_send(rdev_p->t3cdev_p, skb);
157 int cxio_create_cq(struct cxio_rdev *rdev_p, struct t3_cq *cq, int kernel)
159 struct rdma_cq_setup setup;
160 int size = (1UL << (cq->size_log2)) * sizeof(struct t3_cqe);
162 cq->cqid = cxio_hal_get_cqid(rdev_p->rscp);
166 cq->sw_queue = kzalloc(size, GFP_KERNEL);
170 cq->queue = dma_alloc_coherent(&(rdev_p->rnic_info.pdev->dev), size,
171 &(cq->dma_addr), GFP_KERNEL);
176 pci_unmap_addr_set(cq, mapping, cq->dma_addr);
177 memset(cq->queue, 0, size);
179 setup.base_addr = (u64) (cq->dma_addr);
180 setup.size = 1UL << cq->size_log2;
181 setup.credits = 65535;
182 setup.credit_thres = 1;
183 if (rdev_p->t3cdev_p->type != T3A)
187 return (rdev_p->t3cdev_p->ctl(rdev_p->t3cdev_p, RDMA_CQ_SETUP, &setup));
190 int cxio_resize_cq(struct cxio_rdev *rdev_p, struct t3_cq *cq)
192 struct rdma_cq_setup setup;
194 setup.base_addr = (u64) (cq->dma_addr);
195 setup.size = 1UL << cq->size_log2;
196 setup.credits = setup.size;
197 setup.credit_thres = setup.size; /* TBD: overflow recovery */
199 return (rdev_p->t3cdev_p->ctl(rdev_p->t3cdev_p, RDMA_CQ_SETUP, &setup));
202 static u32 get_qpid(struct cxio_rdev *rdev_p, struct cxio_ucontext *uctx)
204 struct cxio_qpid_list *entry;
208 mutex_lock(&uctx->lock);
209 if (!list_empty(&uctx->qpids)) {
210 entry = list_entry(uctx->qpids.next, struct cxio_qpid_list,
212 list_del(&entry->entry);
216 qpid = cxio_hal_get_qpid(rdev_p->rscp);
219 for (i = qpid+1; i & rdev_p->qpmask; i++) {
220 entry = kmalloc(sizeof *entry, GFP_KERNEL);
224 list_add_tail(&entry->entry, &uctx->qpids);
228 mutex_unlock(&uctx->lock);
229 PDBG("%s qpid 0x%x\n", __func__, qpid);
233 static void put_qpid(struct cxio_rdev *rdev_p, u32 qpid,
234 struct cxio_ucontext *uctx)
236 struct cxio_qpid_list *entry;
238 entry = kmalloc(sizeof *entry, GFP_KERNEL);
241 PDBG("%s qpid 0x%x\n", __func__, qpid);
243 mutex_lock(&uctx->lock);
244 list_add_tail(&entry->entry, &uctx->qpids);
245 mutex_unlock(&uctx->lock);
248 void cxio_release_ucontext(struct cxio_rdev *rdev_p, struct cxio_ucontext *uctx)
250 struct list_head *pos, *nxt;
251 struct cxio_qpid_list *entry;
253 mutex_lock(&uctx->lock);
254 list_for_each_safe(pos, nxt, &uctx->qpids) {
255 entry = list_entry(pos, struct cxio_qpid_list, entry);
256 list_del_init(&entry->entry);
257 if (!(entry->qpid & rdev_p->qpmask))
258 cxio_hal_put_qpid(rdev_p->rscp, entry->qpid);
261 mutex_unlock(&uctx->lock);
264 void cxio_init_ucontext(struct cxio_rdev *rdev_p, struct cxio_ucontext *uctx)
266 INIT_LIST_HEAD(&uctx->qpids);
267 mutex_init(&uctx->lock);
270 int cxio_create_qp(struct cxio_rdev *rdev_p, u32 kernel_domain,
271 struct t3_wq *wq, struct cxio_ucontext *uctx)
273 int depth = 1UL << wq->size_log2;
274 int rqsize = 1UL << wq->rq_size_log2;
276 wq->qpid = get_qpid(rdev_p, uctx);
280 wq->rq = kzalloc(depth * sizeof(struct t3_swrq), GFP_KERNEL);
284 wq->rq_addr = cxio_hal_rqtpool_alloc(rdev_p, rqsize);
288 wq->sq = kzalloc(depth * sizeof(struct t3_swsq), GFP_KERNEL);
292 wq->queue = dma_alloc_coherent(&(rdev_p->rnic_info.pdev->dev),
293 depth * sizeof(union t3_wr),
294 &(wq->dma_addr), GFP_KERNEL);
298 memset(wq->queue, 0, depth * sizeof(union t3_wr));
299 pci_unmap_addr_set(wq, mapping, wq->dma_addr);
300 wq->doorbell = (void __iomem *)rdev_p->rnic_info.kdb_addr;
302 wq->udb = (u64)rdev_p->rnic_info.udbell_physbase +
303 (wq->qpid << rdev_p->qpshift);
305 PDBG("%s qpid 0x%x doorbell 0x%p udb 0x%llx\n", __func__,
306 wq->qpid, wq->doorbell, (unsigned long long) wq->udb);
311 cxio_hal_rqtpool_free(rdev_p, wq->rq_addr, rqsize);
315 put_qpid(rdev_p, wq->qpid, uctx);
319 int cxio_destroy_cq(struct cxio_rdev *rdev_p, struct t3_cq *cq)
322 err = cxio_hal_clear_cq_ctx(rdev_p, cq->cqid);
324 dma_free_coherent(&(rdev_p->rnic_info.pdev->dev),
325 (1UL << (cq->size_log2))
326 * sizeof(struct t3_cqe), cq->queue,
327 pci_unmap_addr(cq, mapping));
328 cxio_hal_put_cqid(rdev_p->rscp, cq->cqid);
332 int cxio_destroy_qp(struct cxio_rdev *rdev_p, struct t3_wq *wq,
333 struct cxio_ucontext *uctx)
335 dma_free_coherent(&(rdev_p->rnic_info.pdev->dev),
336 (1UL << (wq->size_log2))
337 * sizeof(union t3_wr), wq->queue,
338 pci_unmap_addr(wq, mapping));
340 cxio_hal_rqtpool_free(rdev_p, wq->rq_addr, (1UL << wq->rq_size_log2));
342 put_qpid(rdev_p, wq->qpid, uctx);
346 static void insert_recv_cqe(struct t3_wq *wq, struct t3_cq *cq)
350 PDBG("%s wq %p cq %p sw_rptr 0x%x sw_wptr 0x%x\n", __func__,
351 wq, cq, cq->sw_rptr, cq->sw_wptr);
352 memset(&cqe, 0, sizeof(cqe));
353 cqe.header = cpu_to_be32(V_CQE_STATUS(TPT_ERR_SWFLUSH) |
354 V_CQE_OPCODE(T3_SEND) |
357 V_CQE_QPID(wq->qpid) |
358 V_CQE_GENBIT(Q_GENBIT(cq->sw_wptr,
360 *(cq->sw_queue + Q_PTR2IDX(cq->sw_wptr, cq->size_log2)) = cqe;
364 int cxio_flush_rq(struct t3_wq *wq, struct t3_cq *cq, int count)
369 PDBG("%s wq %p cq %p\n", __func__, wq, cq);
372 PDBG("%s rq_rptr %u rq_wptr %u skip count %u\n", __func__,
373 wq->rq_rptr, wq->rq_wptr, count);
374 ptr = wq->rq_rptr + count;
375 while (ptr++ != wq->rq_wptr) {
376 insert_recv_cqe(wq, cq);
382 static void insert_sq_cqe(struct t3_wq *wq, struct t3_cq *cq,
387 PDBG("%s wq %p cq %p sw_rptr 0x%x sw_wptr 0x%x\n", __func__,
388 wq, cq, cq->sw_rptr, cq->sw_wptr);
389 memset(&cqe, 0, sizeof(cqe));
390 cqe.header = cpu_to_be32(V_CQE_STATUS(TPT_ERR_SWFLUSH) |
391 V_CQE_OPCODE(sqp->opcode) |
394 V_CQE_QPID(wq->qpid) |
395 V_CQE_GENBIT(Q_GENBIT(cq->sw_wptr,
397 cqe.u.scqe.wrid_hi = sqp->sq_wptr;
399 *(cq->sw_queue + Q_PTR2IDX(cq->sw_wptr, cq->size_log2)) = cqe;
403 int cxio_flush_sq(struct t3_wq *wq, struct t3_cq *cq, int count)
407 struct t3_swsq *sqp = wq->sq + Q_PTR2IDX(wq->sq_rptr, wq->sq_size_log2);
409 ptr = wq->sq_rptr + count;
410 sqp = wq->sq + Q_PTR2IDX(ptr, wq->sq_size_log2);
411 while (ptr != wq->sq_wptr) {
413 insert_sq_cqe(wq, cq, sqp);
415 sqp = wq->sq + Q_PTR2IDX(ptr, wq->sq_size_log2);
422 * Move all CQEs from the HWCQ into the SWCQ.
424 void cxio_flush_hw_cq(struct t3_cq *cq)
426 struct t3_cqe *cqe, *swcqe;
428 PDBG("%s cq %p cqid 0x%x\n", __func__, cq, cq->cqid);
429 cqe = cxio_next_hw_cqe(cq);
431 PDBG("%s flushing hwcq rptr 0x%x to swcq wptr 0x%x\n",
432 __func__, cq->rptr, cq->sw_wptr);
433 swcqe = cq->sw_queue + Q_PTR2IDX(cq->sw_wptr, cq->size_log2);
435 swcqe->header |= cpu_to_be32(V_CQE_SWCQE(1));
438 cqe = cxio_next_hw_cqe(cq);
442 static int cqe_completes_wr(struct t3_cqe *cqe, struct t3_wq *wq)
444 if (CQE_OPCODE(*cqe) == T3_TERMINATE)
447 if ((CQE_OPCODE(*cqe) == T3_RDMA_WRITE) && RQ_TYPE(*cqe))
450 if ((CQE_OPCODE(*cqe) == T3_READ_RESP) && SQ_TYPE(*cqe))
453 if (CQE_SEND_OPCODE(*cqe) && RQ_TYPE(*cqe) &&
454 Q_EMPTY(wq->rq_rptr, wq->rq_wptr))
460 void cxio_count_scqes(struct t3_cq *cq, struct t3_wq *wq, int *count)
467 while (!Q_EMPTY(ptr, cq->sw_wptr)) {
468 cqe = cq->sw_queue + (Q_PTR2IDX(ptr, cq->size_log2));
469 if ((SQ_TYPE(*cqe) ||
470 ((CQE_OPCODE(*cqe) == T3_READ_RESP) && wq->oldest_read)) &&
471 (CQE_QPID(*cqe) == wq->qpid))
475 PDBG("%s cq %p count %d\n", __func__, cq, *count);
478 void cxio_count_rcqes(struct t3_cq *cq, struct t3_wq *wq, int *count)
484 PDBG("%s count zero %d\n", __func__, *count);
486 while (!Q_EMPTY(ptr, cq->sw_wptr)) {
487 cqe = cq->sw_queue + (Q_PTR2IDX(ptr, cq->size_log2));
488 if (RQ_TYPE(*cqe) && (CQE_OPCODE(*cqe) != T3_READ_RESP) &&
489 (CQE_QPID(*cqe) == wq->qpid) && cqe_completes_wr(cqe, wq))
493 PDBG("%s cq %p count %d\n", __func__, cq, *count);
496 static int cxio_hal_init_ctrl_cq(struct cxio_rdev *rdev_p)
498 struct rdma_cq_setup setup;
500 setup.base_addr = 0; /* NULL address */
501 setup.size = 1; /* enable the CQ */
504 /* force SGE to redirect to RspQ and interrupt */
505 setup.credit_thres = 0;
507 return (rdev_p->t3cdev_p->ctl(rdev_p->t3cdev_p, RDMA_CQ_SETUP, &setup));
510 static int cxio_hal_init_ctrl_qp(struct cxio_rdev *rdev_p)
513 u64 sge_cmd, ctx0, ctx1;
515 struct t3_modify_qp_wr *wqe;
518 skb = alloc_skb(sizeof(*wqe), GFP_KERNEL);
520 PDBG("%s alloc_skb failed\n", __func__);
523 err = cxio_hal_init_ctrl_cq(rdev_p);
525 PDBG("%s err %d initializing ctrl_cq\n", __func__, err);
528 rdev_p->ctrl_qp.workq = dma_alloc_coherent(
529 &(rdev_p->rnic_info.pdev->dev),
530 (1 << T3_CTRL_QP_SIZE_LOG2) *
532 &(rdev_p->ctrl_qp.dma_addr),
534 if (!rdev_p->ctrl_qp.workq) {
535 PDBG("%s dma_alloc_coherent failed\n", __func__);
539 pci_unmap_addr_set(&rdev_p->ctrl_qp, mapping,
540 rdev_p->ctrl_qp.dma_addr);
541 rdev_p->ctrl_qp.doorbell = (void __iomem *)rdev_p->rnic_info.kdb_addr;
542 memset(rdev_p->ctrl_qp.workq, 0,
543 (1 << T3_CTRL_QP_SIZE_LOG2) * sizeof(union t3_wr));
545 mutex_init(&rdev_p->ctrl_qp.lock);
546 init_waitqueue_head(&rdev_p->ctrl_qp.waitq);
548 /* update HW Ctrl QP context */
549 base_addr = rdev_p->ctrl_qp.dma_addr;
551 ctx0 = (V_EC_SIZE((1 << T3_CTRL_QP_SIZE_LOG2)) |
552 V_EC_BASE_LO((u32) base_addr & 0xffff));
554 ctx0 |= V_EC_CREDITS(FW_WR_NUM);
556 ctx1 = (u32) base_addr;
558 ctx1 |= ((u64) (V_EC_BASE_HI((u32) base_addr & 0xf) | V_EC_RESPQ(0) |
559 V_EC_TYPE(0) | V_EC_GEN(1) |
560 V_EC_UP_TOKEN(T3_CTL_QP_TID) | F_EC_VALID)) << 32;
561 wqe = (struct t3_modify_qp_wr *) skb_put(skb, sizeof(*wqe));
562 memset(wqe, 0, sizeof(*wqe));
563 build_fw_riwrh((struct fw_riwrh *) wqe, T3_WR_QP_MOD, 0, 0,
564 T3_CTL_QP_TID, 7, T3_SOPEOP);
565 wqe->flags = cpu_to_be32(MODQP_WRITE_EC);
566 sge_cmd = (3ULL << 56) | FW_RI_SGEEC_START << 8 | 3;
567 wqe->sge_cmd = cpu_to_be64(sge_cmd);
568 wqe->ctx1 = cpu_to_be64(ctx1);
569 wqe->ctx0 = cpu_to_be64(ctx0);
570 PDBG("CtrlQP dma_addr 0x%llx workq %p size %d\n",
571 (unsigned long long) rdev_p->ctrl_qp.dma_addr,
572 rdev_p->ctrl_qp.workq, 1 << T3_CTRL_QP_SIZE_LOG2);
573 skb->priority = CPL_PRIORITY_CONTROL;
574 return iwch_cxgb3_ofld_send(rdev_p->t3cdev_p, skb);
580 static int cxio_hal_destroy_ctrl_qp(struct cxio_rdev *rdev_p)
582 dma_free_coherent(&(rdev_p->rnic_info.pdev->dev),
583 (1UL << T3_CTRL_QP_SIZE_LOG2)
584 * sizeof(union t3_wr), rdev_p->ctrl_qp.workq,
585 pci_unmap_addr(&rdev_p->ctrl_qp, mapping));
586 return cxio_hal_clear_qp_ctx(rdev_p, T3_CTRL_QP_ID);
589 /* write len bytes of data into addr (32B aligned address)
590 * If data is NULL, clear len byte of memory to zero.
591 * caller acquires the ctrl_qp lock before the call
593 static int cxio_hal_ctrl_qp_write_mem(struct cxio_rdev *rdev_p, u32 addr,
596 u32 i, nr_wqe, copy_len;
598 u8 wr_len, utx_len; /* length in 8 byte flit */
599 enum t3_wr_flags flag;
603 nr_wqe = len % 96 ? len / 96 + 1 : len / 96; /* 96B max per WQE */
604 PDBG("%s wptr 0x%x rptr 0x%x len %d, nr_wqe %d data %p addr 0x%0x\n",
605 __func__, rdev_p->ctrl_qp.wptr, rdev_p->ctrl_qp.rptr, len,
607 utx_len = 3; /* in 32B unit */
608 for (i = 0; i < nr_wqe; i++) {
609 if (Q_FULL(rdev_p->ctrl_qp.rptr, rdev_p->ctrl_qp.wptr,
610 T3_CTRL_QP_SIZE_LOG2)) {
611 PDBG("%s ctrl_qp full wtpr 0x%0x rptr 0x%0x, "
612 "wait for more space i %d\n", __func__,
613 rdev_p->ctrl_qp.wptr, rdev_p->ctrl_qp.rptr, i);
614 if (wait_event_interruptible(rdev_p->ctrl_qp.waitq,
615 !Q_FULL(rdev_p->ctrl_qp.rptr,
616 rdev_p->ctrl_qp.wptr,
617 T3_CTRL_QP_SIZE_LOG2))) {
618 PDBG("%s ctrl_qp workq interrupted\n",
622 PDBG("%s ctrl_qp wakeup, continue posting work request "
623 "i %d\n", __func__, i);
625 wqe = (__be64 *)(rdev_p->ctrl_qp.workq + (rdev_p->ctrl_qp.wptr %
626 (1 << T3_CTRL_QP_SIZE_LOG2)));
628 if (i == (nr_wqe - 1)) {
630 flag = T3_COMPLETION_FLAG;
632 utx_len = len / 32 + 1;
638 * Force a CQE to return the credit to the workq in case
639 * we posted more than half the max QP size of WRs
642 (i % (((1 << T3_CTRL_QP_SIZE_LOG2)) >> 1) == 0)) {
643 flag = T3_COMPLETION_FLAG;
644 PDBG("%s force completion at i %d\n", __func__, i);
647 /* build the utx mem command */
648 wqe += (sizeof(struct t3_bypass_wr) >> 3);
649 utx_cmd = (T3_UTX_MEM_WRITE << 28) | (addr + i * 3);
651 utx_cmd |= (utx_len << 28) | ((utx_len << 2) + 1);
652 *wqe = cpu_to_be64(utx_cmd);
654 copy_data = (u8 *) data + i * 96;
655 copy_len = len > 96 ? 96 : len;
657 /* clear memory content if data is NULL */
659 memcpy(wqe, copy_data, copy_len);
661 memset(wqe, 0, copy_len);
663 memset(((u8 *) wqe) + copy_len, 0,
664 32 - (copy_len % 32));
665 wr_len = ((sizeof(struct t3_bypass_wr)) >> 3) + 1 +
667 wqe = (__be64 *)(rdev_p->ctrl_qp.workq + (rdev_p->ctrl_qp.wptr %
668 (1 << T3_CTRL_QP_SIZE_LOG2)));
670 /* wptr in the WRID[31:0] */
671 ((union t3_wrid *)(wqe+1))->id0.low = rdev_p->ctrl_qp.wptr;
674 * This must be the last write with a memory barrier
677 build_fw_riwrh((struct fw_riwrh *) wqe, T3_WR_BP, flag,
678 Q_GENBIT(rdev_p->ctrl_qp.wptr,
679 T3_CTRL_QP_SIZE_LOG2), T3_CTRL_QP_ID,
681 if (flag == T3_COMPLETION_FLAG)
682 ring_doorbell(rdev_p->ctrl_qp.doorbell, T3_CTRL_QP_ID);
684 rdev_p->ctrl_qp.wptr++;
689 /* IN: stag key, pdid, perm, zbva, to, len, page_size, pbl_size and pbl_addr
691 * TBD: shared memory region support
693 static int __cxio_tpt_op(struct cxio_rdev *rdev_p, u32 reset_tpt_entry,
694 u32 *stag, u8 stag_state, u32 pdid,
695 enum tpt_mem_type type, enum tpt_mem_perm perm,
696 u32 zbva, u64 to, u32 len, u8 page_size,
697 u32 pbl_size, u32 pbl_addr)
700 struct tpt_entry tpt;
704 if (cxio_fatal_error(rdev_p))
707 stag_state = stag_state > 0;
708 stag_idx = (*stag) >> 8;
710 if ((!reset_tpt_entry) && !(*stag != T3_STAG_UNSET)) {
711 stag_idx = cxio_hal_get_stag(rdev_p->rscp);
714 *stag = (stag_idx << 8) | ((*stag) & 0xFF);
716 PDBG("%s stag_state 0x%0x type 0x%0x pdid 0x%0x, stag_idx 0x%x\n",
717 __func__, stag_state, type, pdid, stag_idx);
719 mutex_lock(&rdev_p->ctrl_qp.lock);
721 /* write TPT entry */
723 memset(&tpt, 0, sizeof(tpt));
725 tpt.valid_stag_pdid = cpu_to_be32(F_TPT_VALID |
726 V_TPT_STAG_KEY((*stag) & M_TPT_STAG_KEY) |
727 V_TPT_STAG_STATE(stag_state) |
728 V_TPT_STAG_TYPE(type) | V_TPT_PDID(pdid));
729 BUG_ON(page_size >= 28);
730 tpt.flags_pagesize_qpid = cpu_to_be32(V_TPT_PERM(perm) |
731 ((perm & TPT_MW_BIND) ? F_TPT_MW_BIND_ENABLE : 0) |
732 V_TPT_ADDR_TYPE((zbva ? TPT_ZBTO : TPT_VATO)) |
733 V_TPT_PAGE_SIZE(page_size));
734 tpt.rsvd_pbl_addr = reset_tpt_entry ? 0 :
735 cpu_to_be32(V_TPT_PBL_ADDR(PBL_OFF(rdev_p, pbl_addr)>>3));
736 tpt.len = cpu_to_be32(len);
737 tpt.va_hi = cpu_to_be32((u32) (to >> 32));
738 tpt.va_low_or_fbo = cpu_to_be32((u32) (to & 0xFFFFFFFFULL));
739 tpt.rsvd_bind_cnt_or_pstag = 0;
740 tpt.rsvd_pbl_size = reset_tpt_entry ? 0 :
741 cpu_to_be32(V_TPT_PBL_SIZE(pbl_size >> 2));
743 err = cxio_hal_ctrl_qp_write_mem(rdev_p,
745 (rdev_p->rnic_info.tpt_base >> 5),
748 /* release the stag index to free pool */
750 cxio_hal_put_stag(rdev_p->rscp, stag_idx);
752 wptr = rdev_p->ctrl_qp.wptr;
753 mutex_unlock(&rdev_p->ctrl_qp.lock);
755 if (wait_event_interruptible(rdev_p->ctrl_qp.waitq,
756 SEQ32_GE(rdev_p->ctrl_qp.rptr,
762 int cxio_write_pbl(struct cxio_rdev *rdev_p, __be64 *pbl,
763 u32 pbl_addr, u32 pbl_size)
768 PDBG("%s *pdb_addr 0x%x, pbl_base 0x%x, pbl_size %d\n",
769 __func__, pbl_addr, rdev_p->rnic_info.pbl_base,
772 mutex_lock(&rdev_p->ctrl_qp.lock);
773 err = cxio_hal_ctrl_qp_write_mem(rdev_p, pbl_addr >> 5, pbl_size << 3,
775 wptr = rdev_p->ctrl_qp.wptr;
776 mutex_unlock(&rdev_p->ctrl_qp.lock);
780 if (wait_event_interruptible(rdev_p->ctrl_qp.waitq,
781 SEQ32_GE(rdev_p->ctrl_qp.rptr,
788 int cxio_register_phys_mem(struct cxio_rdev *rdev_p, u32 *stag, u32 pdid,
789 enum tpt_mem_perm perm, u32 zbva, u64 to, u32 len,
790 u8 page_size, u32 pbl_size, u32 pbl_addr)
792 *stag = T3_STAG_UNSET;
793 return __cxio_tpt_op(rdev_p, 0, stag, 1, pdid, TPT_NON_SHARED_MR, perm,
794 zbva, to, len, page_size, pbl_size, pbl_addr);
797 int cxio_reregister_phys_mem(struct cxio_rdev *rdev_p, u32 *stag, u32 pdid,
798 enum tpt_mem_perm perm, u32 zbva, u64 to, u32 len,
799 u8 page_size, u32 pbl_size, u32 pbl_addr)
801 return __cxio_tpt_op(rdev_p, 0, stag, 1, pdid, TPT_NON_SHARED_MR, perm,
802 zbva, to, len, page_size, pbl_size, pbl_addr);
805 int cxio_dereg_mem(struct cxio_rdev *rdev_p, u32 stag, u32 pbl_size,
808 return __cxio_tpt_op(rdev_p, 1, &stag, 0, 0, 0, 0, 0, 0ULL, 0, 0,
812 int cxio_allocate_window(struct cxio_rdev *rdev_p, u32 * stag, u32 pdid)
814 *stag = T3_STAG_UNSET;
815 return __cxio_tpt_op(rdev_p, 0, stag, 0, pdid, TPT_MW, 0, 0, 0ULL, 0, 0,
819 int cxio_deallocate_window(struct cxio_rdev *rdev_p, u32 stag)
821 return __cxio_tpt_op(rdev_p, 1, &stag, 0, 0, 0, 0, 0, 0ULL, 0, 0,
825 int cxio_allocate_stag(struct cxio_rdev *rdev_p, u32 *stag, u32 pdid, u32 pbl_size, u32 pbl_addr)
827 *stag = T3_STAG_UNSET;
828 return __cxio_tpt_op(rdev_p, 0, stag, 0, pdid, TPT_NON_SHARED_MR,
829 0, 0, 0ULL, 0, 0, pbl_size, pbl_addr);
832 int cxio_rdma_init(struct cxio_rdev *rdev_p, struct t3_rdma_init_attr *attr)
834 struct t3_rdma_init_wr *wqe;
835 struct sk_buff *skb = alloc_skb(sizeof(*wqe), GFP_ATOMIC);
838 PDBG("%s rdev_p %p\n", __func__, rdev_p);
839 wqe = (struct t3_rdma_init_wr *) __skb_put(skb, sizeof(*wqe));
840 wqe->wrh.op_seop_flags = cpu_to_be32(V_FW_RIWR_OP(T3_WR_INIT));
841 wqe->wrh.gen_tid_len = cpu_to_be32(V_FW_RIWR_TID(attr->tid) |
842 V_FW_RIWR_LEN(sizeof(*wqe) >> 3));
844 wqe->qpid = cpu_to_be32(attr->qpid);
845 wqe->pdid = cpu_to_be32(attr->pdid);
846 wqe->scqid = cpu_to_be32(attr->scqid);
847 wqe->rcqid = cpu_to_be32(attr->rcqid);
848 wqe->rq_addr = cpu_to_be32(attr->rq_addr - rdev_p->rnic_info.rqt_base);
849 wqe->rq_size = cpu_to_be32(attr->rq_size);
850 wqe->mpaattrs = attr->mpaattrs;
851 wqe->qpcaps = attr->qpcaps;
852 wqe->ulpdu_size = cpu_to_be16(attr->tcp_emss);
853 wqe->rqe_count = cpu_to_be16(attr->rqe_count);
854 wqe->flags_rtr_type = cpu_to_be16(attr->flags |
855 V_RTR_TYPE(attr->rtr_type) |
857 wqe->ord = cpu_to_be32(attr->ord);
858 wqe->ird = cpu_to_be32(attr->ird);
859 wqe->qp_dma_addr = cpu_to_be64(attr->qp_dma_addr);
860 wqe->qp_dma_size = cpu_to_be32(attr->qp_dma_size);
861 wqe->irs = cpu_to_be32(attr->irs);
862 skb->priority = 0; /* 0=>ToeQ; 1=>CtrlQ */
863 return iwch_cxgb3_ofld_send(rdev_p->t3cdev_p, skb);
866 void cxio_register_ev_cb(cxio_hal_ev_callback_func_t ev_cb)
871 void cxio_unregister_ev_cb(cxio_hal_ev_callback_func_t ev_cb)
876 static int cxio_hal_ev_handler(struct t3cdev *t3cdev_p, struct sk_buff *skb)
879 struct cxio_rdev *rdev_p = NULL;
880 struct respQ_msg_t *rsp_msg = (struct respQ_msg_t *) skb->data;
881 PDBG("%d: %s cq_id 0x%x cq_ptr 0x%x genbit %0x overflow %0x an %0x"
882 " se %0x notify %0x cqbranch %0x creditth %0x\n",
883 cnt, __func__, RSPQ_CQID(rsp_msg), RSPQ_CQPTR(rsp_msg),
884 RSPQ_GENBIT(rsp_msg), RSPQ_OVERFLOW(rsp_msg), RSPQ_AN(rsp_msg),
885 RSPQ_SE(rsp_msg), RSPQ_NOTIFY(rsp_msg), RSPQ_CQBRANCH(rsp_msg),
886 RSPQ_CREDIT_THRESH(rsp_msg));
887 PDBG("CQE: QPID 0x%0x genbit %0x type 0x%0x status 0x%0x opcode %d "
888 "len 0x%0x wrid_hi_stag 0x%x wrid_low_msn 0x%x\n",
889 CQE_QPID(rsp_msg->cqe), CQE_GENBIT(rsp_msg->cqe),
890 CQE_TYPE(rsp_msg->cqe), CQE_STATUS(rsp_msg->cqe),
891 CQE_OPCODE(rsp_msg->cqe), CQE_LEN(rsp_msg->cqe),
892 CQE_WRID_HI(rsp_msg->cqe), CQE_WRID_LOW(rsp_msg->cqe));
893 rdev_p = (struct cxio_rdev *)t3cdev_p->ulp;
895 PDBG("%s called by t3cdev %p with null ulp\n", __func__,
899 if (CQE_QPID(rsp_msg->cqe) == T3_CTRL_QP_ID) {
900 rdev_p->ctrl_qp.rptr = CQE_WRID_LOW(rsp_msg->cqe) + 1;
901 wake_up_interruptible(&rdev_p->ctrl_qp.waitq);
902 dev_kfree_skb_irq(skb);
903 } else if (CQE_QPID(rsp_msg->cqe) == 0xfff8)
904 dev_kfree_skb_irq(skb);
906 (*cxio_ev_cb) (rdev_p, skb);
908 dev_kfree_skb_irq(skb);
913 /* Caller takes care of locking if needed */
914 int cxio_rdev_open(struct cxio_rdev *rdev_p)
916 struct net_device *netdev_p = NULL;
918 if (strlen(rdev_p->dev_name)) {
919 if (cxio_hal_find_rdev_by_name(rdev_p->dev_name)) {
922 netdev_p = dev_get_by_name(&init_net, rdev_p->dev_name);
927 } else if (rdev_p->t3cdev_p) {
928 if (cxio_hal_find_rdev_by_t3cdev(rdev_p->t3cdev_p)) {
931 netdev_p = rdev_p->t3cdev_p->lldev;
932 strncpy(rdev_p->dev_name, rdev_p->t3cdev_p->name,
933 T3_MAX_DEV_NAME_LEN);
935 PDBG("%s t3cdev_p or dev_name must be set\n", __func__);
939 list_add_tail(&rdev_p->entry, &rdev_list);
941 PDBG("%s opening rnic dev %s\n", __func__, rdev_p->dev_name);
942 memset(&rdev_p->ctrl_qp, 0, sizeof(rdev_p->ctrl_qp));
943 if (!rdev_p->t3cdev_p)
944 rdev_p->t3cdev_p = dev2t3cdev(netdev_p);
945 rdev_p->t3cdev_p->ulp = (void *) rdev_p;
947 err = rdev_p->t3cdev_p->ctl(rdev_p->t3cdev_p, GET_EMBEDDED_INFO,
950 printk(KERN_ERR "%s t3cdev_p(%p)->ctl returned error %d.\n",
951 __func__, rdev_p->t3cdev_p, err);
954 if (G_FW_VERSION_MAJOR(rdev_p->fw_info.fw_vers) != CXIO_FW_MAJ) {
955 printk(KERN_ERR MOD "fatal firmware version mismatch: "
956 "need version %u but adapter has version %u\n",
958 G_FW_VERSION_MAJOR(rdev_p->fw_info.fw_vers));
963 err = rdev_p->t3cdev_p->ctl(rdev_p->t3cdev_p, RDMA_GET_PARAMS,
964 &(rdev_p->rnic_info));
966 printk(KERN_ERR "%s t3cdev_p(%p)->ctl returned error %d.\n",
967 __func__, rdev_p->t3cdev_p, err);
970 err = rdev_p->t3cdev_p->ctl(rdev_p->t3cdev_p, GET_PORTS,
971 &(rdev_p->port_info));
973 printk(KERN_ERR "%s t3cdev_p(%p)->ctl returned error %d.\n",
974 __func__, rdev_p->t3cdev_p, err);
979 * qpshift is the number of bits to shift the qpid left in order
980 * to get the correct address of the doorbell for that qp.
982 cxio_init_ucontext(rdev_p, &rdev_p->uctx);
983 rdev_p->qpshift = PAGE_SHIFT -
985 ilog2(rdev_p->rnic_info.udbell_len >>
987 rdev_p->qpnr = rdev_p->rnic_info.udbell_len >> PAGE_SHIFT;
988 rdev_p->qpmask = (65536 >> ilog2(rdev_p->qpnr)) - 1;
989 PDBG("%s rnic %s info: tpt_base 0x%0x tpt_top 0x%0x num stags %d "
990 "pbl_base 0x%0x pbl_top 0x%0x rqt_base 0x%0x, rqt_top 0x%0x\n",
991 __func__, rdev_p->dev_name, rdev_p->rnic_info.tpt_base,
992 rdev_p->rnic_info.tpt_top, cxio_num_stags(rdev_p),
993 rdev_p->rnic_info.pbl_base,
994 rdev_p->rnic_info.pbl_top, rdev_p->rnic_info.rqt_base,
995 rdev_p->rnic_info.rqt_top);
996 PDBG("udbell_len 0x%0x udbell_physbase 0x%lx kdb_addr %p qpshift %lu "
997 "qpnr %d qpmask 0x%x\n",
998 rdev_p->rnic_info.udbell_len,
999 rdev_p->rnic_info.udbell_physbase, rdev_p->rnic_info.kdb_addr,
1000 rdev_p->qpshift, rdev_p->qpnr, rdev_p->qpmask);
1002 err = cxio_hal_init_ctrl_qp(rdev_p);
1004 printk(KERN_ERR "%s error %d initializing ctrl_qp.\n",
1008 err = cxio_hal_init_resource(rdev_p, cxio_num_stags(rdev_p), 0,
1009 0, T3_MAX_NUM_QP, T3_MAX_NUM_CQ,
1012 printk(KERN_ERR "%s error %d initializing hal resources.\n",
1016 err = cxio_hal_pblpool_create(rdev_p);
1018 printk(KERN_ERR "%s error %d initializing pbl mem pool.\n",
1022 err = cxio_hal_rqtpool_create(rdev_p);
1024 printk(KERN_ERR "%s error %d initializing rqt mem pool.\n",
1030 cxio_hal_pblpool_destroy(rdev_p);
1032 cxio_hal_destroy_resource(rdev_p->rscp);
1034 cxio_hal_destroy_ctrl_qp(rdev_p);
1036 rdev_p->t3cdev_p->ulp = NULL;
1037 list_del(&rdev_p->entry);
1041 void cxio_rdev_close(struct cxio_rdev *rdev_p)
1044 cxio_hal_pblpool_destroy(rdev_p);
1045 cxio_hal_rqtpool_destroy(rdev_p);
1046 list_del(&rdev_p->entry);
1047 cxio_hal_destroy_ctrl_qp(rdev_p);
1048 cxio_hal_destroy_resource(rdev_p->rscp);
1049 rdev_p->t3cdev_p->ulp = NULL;
1053 int __init cxio_hal_init(void)
1055 if (cxio_hal_init_rhdl_resource(T3_MAX_NUM_RI))
1057 t3_register_cpl_handler(CPL_ASYNC_NOTIF, cxio_hal_ev_handler);
1061 void __exit cxio_hal_exit(void)
1063 struct cxio_rdev *rdev, *tmp;
1065 t3_register_cpl_handler(CPL_ASYNC_NOTIF, NULL);
1066 list_for_each_entry_safe(rdev, tmp, &rdev_list, entry)
1067 cxio_rdev_close(rdev);
1068 cxio_hal_destroy_rhdl_resource();
1071 static void flush_completed_wrs(struct t3_wq *wq, struct t3_cq *cq)
1073 struct t3_swsq *sqp;
1074 __u32 ptr = wq->sq_rptr;
1075 int count = Q_COUNT(wq->sq_rptr, wq->sq_wptr);
1077 sqp = wq->sq + Q_PTR2IDX(ptr, wq->sq_size_log2);
1079 if (!sqp->signaled) {
1081 sqp = wq->sq + Q_PTR2IDX(ptr, wq->sq_size_log2);
1082 } else if (sqp->complete) {
1085 * Insert this completed cqe into the swcq.
1087 PDBG("%s moving cqe into swcq sq idx %ld cq idx %ld\n",
1088 __func__, Q_PTR2IDX(ptr, wq->sq_size_log2),
1089 Q_PTR2IDX(cq->sw_wptr, cq->size_log2));
1090 sqp->cqe.header |= htonl(V_CQE_SWCQE(1));
1091 *(cq->sw_queue + Q_PTR2IDX(cq->sw_wptr, cq->size_log2))
1100 static void create_read_req_cqe(struct t3_wq *wq, struct t3_cqe *hw_cqe,
1101 struct t3_cqe *read_cqe)
1103 read_cqe->u.scqe.wrid_hi = wq->oldest_read->sq_wptr;
1104 read_cqe->len = wq->oldest_read->read_len;
1105 read_cqe->header = htonl(V_CQE_QPID(CQE_QPID(*hw_cqe)) |
1106 V_CQE_SWCQE(SW_CQE(*hw_cqe)) |
1107 V_CQE_OPCODE(T3_READ_REQ) |
1112 * Return a ptr to the next read wr in the SWSQ or NULL.
1114 static void advance_oldest_read(struct t3_wq *wq)
1117 u32 rptr = wq->oldest_read - wq->sq + 1;
1118 u32 wptr = Q_PTR2IDX(wq->sq_wptr, wq->sq_size_log2);
1120 while (Q_PTR2IDX(rptr, wq->sq_size_log2) != wptr) {
1121 wq->oldest_read = wq->sq + Q_PTR2IDX(rptr, wq->sq_size_log2);
1123 if (wq->oldest_read->opcode == T3_READ_REQ)
1127 wq->oldest_read = NULL;
1134 * check the validity of the first CQE,
1135 * supply the wq assicated with the qpid.
1137 * credit: cq credit to return to sge.
1138 * cqe_flushed: 1 iff the CQE is flushed.
1139 * cqe: copy of the polled CQE.
1143 * -1 CQE skipped, try again.
1145 int cxio_poll_cq(struct t3_wq *wq, struct t3_cq *cq, struct t3_cqe *cqe,
1146 u8 *cqe_flushed, u64 *cookie, u32 *credit)
1149 struct t3_cqe *hw_cqe, read_cqe;
1153 hw_cqe = cxio_next_cqe(cq);
1155 PDBG("%s CQE OOO %d qpid 0x%0x genbit %d type %d status 0x%0x"
1156 " opcode 0x%0x len 0x%0x wrid_hi_stag 0x%x wrid_low_msn 0x%x\n",
1157 __func__, CQE_OOO(*hw_cqe), CQE_QPID(*hw_cqe),
1158 CQE_GENBIT(*hw_cqe), CQE_TYPE(*hw_cqe), CQE_STATUS(*hw_cqe),
1159 CQE_OPCODE(*hw_cqe), CQE_LEN(*hw_cqe), CQE_WRID_HI(*hw_cqe),
1160 CQE_WRID_LOW(*hw_cqe));
1163 * skip cqe's not affiliated with a QP.
1171 * Gotta tweak READ completions:
1172 * 1) the cqe doesn't contain the sq_wptr from the wr.
1173 * 2) opcode not reflected from the wr.
1174 * 3) read_len not reflected from the wr.
1175 * 4) cq_type is RQ_TYPE not SQ_TYPE.
1177 if (RQ_TYPE(*hw_cqe) && (CQE_OPCODE(*hw_cqe) == T3_READ_RESP)) {
1180 * If this is an unsolicited read response, then the read
1181 * was generated by the kernel driver as part of peer-2-peer
1182 * connection setup. So ignore the completion.
1184 if (!wq->oldest_read) {
1185 if (CQE_STATUS(*hw_cqe))
1192 * Don't write to the HWCQ, so create a new read req CQE
1195 create_read_req_cqe(wq, hw_cqe, &read_cqe);
1197 advance_oldest_read(wq);
1201 * T3A: Discard TERMINATE CQEs.
1203 if (CQE_OPCODE(*hw_cqe) == T3_TERMINATE) {
1209 if (CQE_STATUS(*hw_cqe) || wq->error) {
1210 *cqe_flushed = wq->error;
1214 * T3A inserts errors into the CQE. We cannot return
1215 * these as work completions.
1217 /* incoming write failures */
1218 if ((CQE_OPCODE(*hw_cqe) == T3_RDMA_WRITE)
1219 && RQ_TYPE(*hw_cqe)) {
1223 /* incoming read request failures */
1224 if ((CQE_OPCODE(*hw_cqe) == T3_READ_RESP) && SQ_TYPE(*hw_cqe)) {
1229 /* incoming SEND with no receive posted failures */
1230 if (CQE_SEND_OPCODE(*hw_cqe) && RQ_TYPE(*hw_cqe) &&
1231 Q_EMPTY(wq->rq_rptr, wq->rq_wptr)) {
1235 BUG_ON((*cqe_flushed == 0) && !SW_CQE(*hw_cqe));
1242 if (RQ_TYPE(*hw_cqe)) {
1245 * HW only validates 4 bits of MSN. So we must validate that
1246 * the MSN in the SEND is the next expected MSN. If its not,
1247 * then we complete this with TPT_ERR_MSN and mark the wq in
1251 if (Q_EMPTY(wq->rq_rptr, wq->rq_wptr)) {
1257 if (unlikely((CQE_WRID_MSN(*hw_cqe) != (wq->rq_rptr + 1)))) {
1259 hw_cqe->header |= htonl(V_CQE_STATUS(TPT_ERR_MSN));
1266 * If we get here its a send completion.
1268 * Handle out of order completion. These get stuffed
1269 * in the SW SQ. Then the SW SQ is walked to move any
1270 * now in-order completions into the SW CQ. This handles
1272 * 1) reaping unsignaled WRs when the first subsequent
1273 * signaled WR is completed.
1274 * 2) out of order read completions.
1276 if (!SW_CQE(*hw_cqe) && (CQE_WRID_SQ_WPTR(*hw_cqe) != wq->sq_rptr)) {
1277 struct t3_swsq *sqp;
1279 PDBG("%s out of order completion going in swsq at idx %ld\n",
1281 Q_PTR2IDX(CQE_WRID_SQ_WPTR(*hw_cqe), wq->sq_size_log2));
1283 Q_PTR2IDX(CQE_WRID_SQ_WPTR(*hw_cqe), wq->sq_size_log2);
1294 * Reap the associated WR(s) that are freed up with this
1297 if (SQ_TYPE(*hw_cqe)) {
1298 wq->sq_rptr = CQE_WRID_SQ_WPTR(*hw_cqe);
1299 PDBG("%s completing sq idx %ld\n", __func__,
1300 Q_PTR2IDX(wq->sq_rptr, wq->sq_size_log2));
1301 *cookie = wq->sq[Q_PTR2IDX(wq->sq_rptr, wq->sq_size_log2)].wr_id;
1304 PDBG("%s completing rq idx %ld\n", __func__,
1305 Q_PTR2IDX(wq->rq_rptr, wq->rq_size_log2));
1306 *cookie = wq->rq[Q_PTR2IDX(wq->rq_rptr, wq->rq_size_log2)].wr_id;
1307 if (wq->rq[Q_PTR2IDX(wq->rq_rptr, wq->rq_size_log2)].pbl_addr)
1308 cxio_hal_pblpool_free(wq->rdev,
1309 wq->rq[Q_PTR2IDX(wq->rq_rptr,
1310 wq->rq_size_log2)].pbl_addr, T3_STAG0_PBL_SIZE);
1311 BUG_ON(Q_EMPTY(wq->rq_rptr, wq->rq_wptr));
1317 * Flush any completed cqes that are now in-order.
1319 flush_completed_wrs(wq, cq);
1322 if (SW_CQE(*hw_cqe)) {
1323 PDBG("%s cq %p cqid 0x%x skip sw cqe sw_rptr 0x%x\n",
1324 __func__, cq, cq->cqid, cq->sw_rptr);
1327 PDBG("%s cq %p cqid 0x%x skip hw cqe rptr 0x%x\n",
1328 __func__, cq, cq->cqid, cq->rptr);
1332 * T3A: compute credits.
1334 if (((cq->rptr - cq->wptr) > (1 << (cq->size_log2 - 1)))
1335 || ((cq->rptr - cq->wptr) >= 128)) {
1336 *credit = cq->rptr - cq->wptr;
1337 cq->wptr = cq->rptr;