diff options
Diffstat (limited to '')
| -rw-r--r-- | drivers/infiniband/hw/cxgb4/cq.c | 1184 |
1 files changed, 1184 insertions, 0 deletions
diff --git a/drivers/infiniband/hw/cxgb4/cq.c b/drivers/infiniband/hw/cxgb4/cq.c new file mode 100644 index 000000000..d6cfefc26 --- /dev/null +++ b/drivers/infiniband/hw/cxgb4/cq.c @@ -0,0 +1,1184 @@ +/* + * Copyright (c) 2009-2010 Chelsio, Inc. All rights reserved. + * + * This software is available to you under a choice of one of two + * licenses. You may choose to be licensed under the terms of the GNU + * General Public License (GPL) Version 2, available from the file + * COPYING in the main directory of this source tree, or the + * OpenIB.org BSD license below: + * + * Redistribution and use in source and binary forms, with or + * without modification, are permitted provided that the following + * conditions are met: + * + * - Redistributions of source code must retain the above + * copyright notice, this list of conditions and the following + * disclaimer. + * + * - Redistributions in binary form must reproduce the above + * copyright notice, this list of conditions and the following + * disclaimer in the documentation and/or other materials + * provided with the distribution. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, + * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF + * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND + * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS + * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN + * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN + * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE + * SOFTWARE. + */ + +#include <rdma/uverbs_ioctl.h> + +#include "iw_cxgb4.h" + +static void destroy_cq(struct c4iw_rdev *rdev, struct t4_cq *cq, + struct c4iw_dev_ucontext *uctx, struct sk_buff *skb, + struct c4iw_wr_wait *wr_waitp) +{ + struct fw_ri_res_wr *res_wr; + struct fw_ri_res *res; + int wr_len; + + wr_len = sizeof(*res_wr) + sizeof(*res); + set_wr_txq(skb, CPL_PRIORITY_CONTROL, 0); + + res_wr = __skb_put_zero(skb, wr_len); + res_wr->op_nres = cpu_to_be32( + FW_WR_OP_V(FW_RI_RES_WR) | + FW_RI_RES_WR_NRES_V(1) | + FW_WR_COMPL_F); + res_wr->len16_pkd = cpu_to_be32(DIV_ROUND_UP(wr_len, 16)); + res_wr->cookie = (uintptr_t)wr_waitp; + res = res_wr->res; + res->u.cq.restype = FW_RI_RES_TYPE_CQ; + res->u.cq.op = FW_RI_RES_OP_RESET; + res->u.cq.iqid = cpu_to_be32(cq->cqid); + + c4iw_init_wr_wait(wr_waitp); + c4iw_ref_send_wait(rdev, skb, wr_waitp, 0, 0, __func__); + + kfree(cq->sw_queue); + dma_free_coherent(&(rdev->lldi.pdev->dev), + cq->memsize, cq->queue, + dma_unmap_addr(cq, mapping)); + c4iw_put_cqid(rdev, cq->cqid, uctx); +} + +static int create_cq(struct c4iw_rdev *rdev, struct t4_cq *cq, + struct c4iw_dev_ucontext *uctx, + struct c4iw_wr_wait *wr_waitp) +{ + struct fw_ri_res_wr *res_wr; + struct fw_ri_res *res; + int wr_len; + int user = (uctx != &rdev->uctx); + int ret; + struct sk_buff *skb; + struct c4iw_ucontext *ucontext = NULL; + + if (user) + ucontext = container_of(uctx, struct c4iw_ucontext, uctx); + + cq->cqid = c4iw_get_cqid(rdev, uctx); + if (!cq->cqid) { + ret = -ENOMEM; + goto err1; + } + + if (!user) { + cq->sw_queue = kzalloc(cq->memsize, GFP_KERNEL); + if (!cq->sw_queue) { + ret = -ENOMEM; + goto err2; + } + } + cq->queue = dma_alloc_coherent(&rdev->lldi.pdev->dev, cq->memsize, + &cq->dma_addr, GFP_KERNEL); + if (!cq->queue) { + ret = -ENOMEM; + goto err3; + } + dma_unmap_addr_set(cq, mapping, cq->dma_addr); + + if (user && ucontext->is_32b_cqe) { + cq->qp_errp = &((struct t4_status_page *) + ((u8 *)cq->queue + (cq->size - 1) * + (sizeof(*cq->queue) / 2)))->qp_err; + } else { + cq->qp_errp = &((struct t4_status_page *) + ((u8 *)cq->queue + (cq->size - 1) * + sizeof(*cq->queue)))->qp_err; + } + + /* build fw_ri_res_wr */ + wr_len = sizeof(*res_wr) + sizeof(*res); + + skb = alloc_skb(wr_len, GFP_KERNEL); + if (!skb) { + ret = -ENOMEM; + goto err4; + } + set_wr_txq(skb, CPL_PRIORITY_CONTROL, 0); + + res_wr = __skb_put_zero(skb, wr_len); + res_wr->op_nres = cpu_to_be32( + FW_WR_OP_V(FW_RI_RES_WR) | + FW_RI_RES_WR_NRES_V(1) | + FW_WR_COMPL_F); + res_wr->len16_pkd = cpu_to_be32(DIV_ROUND_UP(wr_len, 16)); + res_wr->cookie = (uintptr_t)wr_waitp; + res = res_wr->res; + res->u.cq.restype = FW_RI_RES_TYPE_CQ; + res->u.cq.op = FW_RI_RES_OP_WRITE; + res->u.cq.iqid = cpu_to_be32(cq->cqid); + res->u.cq.iqandst_to_iqandstindex = cpu_to_be32( + FW_RI_RES_WR_IQANUS_V(0) | + FW_RI_RES_WR_IQANUD_V(1) | + FW_RI_RES_WR_IQANDST_F | + FW_RI_RES_WR_IQANDSTINDEX_V( + rdev->lldi.ciq_ids[cq->vector])); + res->u.cq.iqdroprss_to_iqesize = cpu_to_be16( + FW_RI_RES_WR_IQDROPRSS_F | + FW_RI_RES_WR_IQPCIECH_V(2) | + FW_RI_RES_WR_IQINTCNTTHRESH_V(0) | + FW_RI_RES_WR_IQO_F | + ((user && ucontext->is_32b_cqe) ? + FW_RI_RES_WR_IQESIZE_V(1) : + FW_RI_RES_WR_IQESIZE_V(2))); + res->u.cq.iqsize = cpu_to_be16(cq->size); + res->u.cq.iqaddr = cpu_to_be64(cq->dma_addr); + + c4iw_init_wr_wait(wr_waitp); + ret = c4iw_ref_send_wait(rdev, skb, wr_waitp, 0, 0, __func__); + if (ret) + goto err4; + + cq->gen = 1; + cq->gts = rdev->lldi.gts_reg; + cq->rdev = rdev; + + cq->bar2_va = c4iw_bar2_addrs(rdev, cq->cqid, CXGB4_BAR2_QTYPE_INGRESS, + &cq->bar2_qid, + user ? &cq->bar2_pa : NULL); + if (user && !cq->bar2_pa) { + pr_warn("%s: cqid %u not in BAR2 range\n", + pci_name(rdev->lldi.pdev), cq->cqid); + ret = -EINVAL; + goto err4; + } + return 0; +err4: + dma_free_coherent(&rdev->lldi.pdev->dev, cq->memsize, cq->queue, + dma_unmap_addr(cq, mapping)); +err3: + kfree(cq->sw_queue); +err2: + c4iw_put_cqid(rdev, cq->cqid, uctx); +err1: + return ret; +} + +static void insert_recv_cqe(struct t4_wq *wq, struct t4_cq *cq, u32 srqidx) +{ + struct t4_cqe cqe; + + pr_debug("wq %p cq %p sw_cidx %u sw_pidx %u\n", + wq, cq, cq->sw_cidx, cq->sw_pidx); + memset(&cqe, 0, sizeof(cqe)); + cqe.header = cpu_to_be32(CQE_STATUS_V(T4_ERR_SWFLUSH) | + CQE_OPCODE_V(FW_RI_SEND) | + CQE_TYPE_V(0) | + CQE_SWCQE_V(1) | + CQE_QPID_V(wq->sq.qid)); + cqe.bits_type_ts = cpu_to_be64(CQE_GENBIT_V((u64)cq->gen)); + if (srqidx) + cqe.u.srcqe.abs_rqe_idx = cpu_to_be32(srqidx); + cq->sw_queue[cq->sw_pidx] = cqe; + t4_swcq_produce(cq); +} + +int c4iw_flush_rq(struct t4_wq *wq, struct t4_cq *cq, int count) +{ + int flushed = 0; + int in_use = wq->rq.in_use - count; + + pr_debug("wq %p cq %p rq.in_use %u skip count %u\n", + wq, cq, wq->rq.in_use, count); + while (in_use--) { + insert_recv_cqe(wq, cq, 0); + flushed++; + } + return flushed; +} + +static void insert_sq_cqe(struct t4_wq *wq, struct t4_cq *cq, + struct t4_swsqe *swcqe) +{ + struct t4_cqe cqe; + + pr_debug("wq %p cq %p sw_cidx %u sw_pidx %u\n", + wq, cq, cq->sw_cidx, cq->sw_pidx); + memset(&cqe, 0, sizeof(cqe)); + cqe.header = cpu_to_be32(CQE_STATUS_V(T4_ERR_SWFLUSH) | + CQE_OPCODE_V(swcqe->opcode) | + CQE_TYPE_V(1) | + CQE_SWCQE_V(1) | + CQE_QPID_V(wq->sq.qid)); + CQE_WRID_SQ_IDX(&cqe) = swcqe->idx; + cqe.bits_type_ts = cpu_to_be64(CQE_GENBIT_V((u64)cq->gen)); + cq->sw_queue[cq->sw_pidx] = cqe; + t4_swcq_produce(cq); +} + +static void advance_oldest_read(struct t4_wq *wq); + +int c4iw_flush_sq(struct c4iw_qp *qhp) +{ + int flushed = 0; + struct t4_wq *wq = &qhp->wq; + struct c4iw_cq *chp = to_c4iw_cq(qhp->ibqp.send_cq); + struct t4_cq *cq = &chp->cq; + int idx; + struct t4_swsqe *swsqe; + + if (wq->sq.flush_cidx == -1) + wq->sq.flush_cidx = wq->sq.cidx; + idx = wq->sq.flush_cidx; + while (idx != wq->sq.pidx) { + swsqe = &wq->sq.sw_sq[idx]; + swsqe->flushed = 1; + insert_sq_cqe(wq, cq, swsqe); + if (wq->sq.oldest_read == swsqe) { + advance_oldest_read(wq); + } + flushed++; + if (++idx == wq->sq.size) + idx = 0; + } + wq->sq.flush_cidx += flushed; + if (wq->sq.flush_cidx >= wq->sq.size) + wq->sq.flush_cidx -= wq->sq.size; + return flushed; +} + +static void flush_completed_wrs(struct t4_wq *wq, struct t4_cq *cq) +{ + struct t4_swsqe *swsqe; + int cidx; + + if (wq->sq.flush_cidx == -1) + wq->sq.flush_cidx = wq->sq.cidx; + cidx = wq->sq.flush_cidx; + + while (cidx != wq->sq.pidx) { + swsqe = &wq->sq.sw_sq[cidx]; + if (!swsqe->signaled) { + if (++cidx == wq->sq.size) + cidx = 0; + } else if (swsqe->complete) { + + /* + * Insert this completed cqe into the swcq. + */ + pr_debug("moving cqe into swcq sq idx %u cq idx %u\n", + cidx, cq->sw_pidx); + swsqe->cqe.header |= htonl(CQE_SWCQE_V(1)); + cq->sw_queue[cq->sw_pidx] = swsqe->cqe; + t4_swcq_produce(cq); + swsqe->flushed = 1; + if (++cidx == wq->sq.size) + cidx = 0; + wq->sq.flush_cidx = cidx; + } else + break; + } +} + +static void create_read_req_cqe(struct t4_wq *wq, struct t4_cqe *hw_cqe, + struct t4_cqe *read_cqe) +{ + read_cqe->u.scqe.cidx = wq->sq.oldest_read->idx; + read_cqe->len = htonl(wq->sq.oldest_read->read_len); + read_cqe->header = htonl(CQE_QPID_V(CQE_QPID(hw_cqe)) | + CQE_SWCQE_V(SW_CQE(hw_cqe)) | + CQE_OPCODE_V(FW_RI_READ_REQ) | + CQE_TYPE_V(1)); + read_cqe->bits_type_ts = hw_cqe->bits_type_ts; +} + +static void advance_oldest_read(struct t4_wq *wq) +{ + + u32 rptr = wq->sq.oldest_read - wq->sq.sw_sq + 1; + + if (rptr == wq->sq.size) + rptr = 0; + while (rptr != wq->sq.pidx) { + wq->sq.oldest_read = &wq->sq.sw_sq[rptr]; + + if (wq->sq.oldest_read->opcode == FW_RI_READ_REQ) + return; + if (++rptr == wq->sq.size) + rptr = 0; + } + wq->sq.oldest_read = NULL; +} + +/* + * Move all CQEs from the HWCQ into the SWCQ. + * Deal with out-of-order and/or completions that complete + * prior unsignalled WRs. + */ +void c4iw_flush_hw_cq(struct c4iw_cq *chp, struct c4iw_qp *flush_qhp) +{ + struct t4_cqe *hw_cqe, *swcqe, read_cqe; + struct c4iw_qp *qhp; + struct t4_swsqe *swsqe; + int ret; + + pr_debug("cqid 0x%x\n", chp->cq.cqid); + ret = t4_next_hw_cqe(&chp->cq, &hw_cqe); + + /* + * This logic is similar to poll_cq(), but not quite the same + * unfortunately. Need to move pertinent HW CQEs to the SW CQ but + * also do any translation magic that poll_cq() normally does. + */ + while (!ret) { + qhp = get_qhp(chp->rhp, CQE_QPID(hw_cqe)); + + /* + * drop CQEs with no associated QP + */ + if (qhp == NULL) + goto next_cqe; + + if (flush_qhp != qhp) { + spin_lock(&qhp->lock); + + if (qhp->wq.flushed == 1) + goto next_cqe; + } + + if (CQE_OPCODE(hw_cqe) == FW_RI_TERMINATE) + goto next_cqe; + + if (CQE_OPCODE(hw_cqe) == FW_RI_READ_RESP) { + + /* If we have reached here because of async + * event or other error, and have egress error + * then drop + */ + if (CQE_TYPE(hw_cqe) == 1) + goto next_cqe; + + /* drop peer2peer RTR reads. + */ + if (CQE_WRID_STAG(hw_cqe) == 1) + goto next_cqe; + + /* + * Eat completions for unsignaled read WRs. + */ + if (!qhp->wq.sq.oldest_read->signaled) { + advance_oldest_read(&qhp->wq); + goto next_cqe; + } + + /* + * Don't write to the HWCQ, create a new read req CQE + * in local memory and move it into the swcq. + */ + create_read_req_cqe(&qhp->wq, hw_cqe, &read_cqe); + hw_cqe = &read_cqe; + advance_oldest_read(&qhp->wq); + } + + /* if its a SQ completion, then do the magic to move all the + * unsignaled and now in-order completions into the swcq. + */ + if (SQ_TYPE(hw_cqe)) { + swsqe = &qhp->wq.sq.sw_sq[CQE_WRID_SQ_IDX(hw_cqe)]; + swsqe->cqe = *hw_cqe; + swsqe->complete = 1; + flush_completed_wrs(&qhp->wq, &chp->cq); + } else { + swcqe = &chp->cq.sw_queue[chp->cq.sw_pidx]; + *swcqe = *hw_cqe; + swcqe->header |= cpu_to_be32(CQE_SWCQE_V(1)); + t4_swcq_produce(&chp->cq); + } +next_cqe: + t4_hwcq_consume(&chp->cq); + ret = t4_next_hw_cqe(&chp->cq, &hw_cqe); + if (qhp && flush_qhp != qhp) + spin_unlock(&qhp->lock); + } +} + +static int cqe_completes_wr(struct t4_cqe *cqe, struct t4_wq *wq) +{ + if (DRAIN_CQE(cqe)) { + WARN_ONCE(1, "Unexpected DRAIN CQE qp id %u!\n", wq->sq.qid); + return 0; + } + + if (CQE_OPCODE(cqe) == FW_RI_TERMINATE) + return 0; + + if ((CQE_OPCODE(cqe) == FW_RI_RDMA_WRITE) && RQ_TYPE(cqe)) + return 0; + + if ((CQE_OPCODE(cqe) == FW_RI_READ_RESP) && SQ_TYPE(cqe)) + return 0; + + if (CQE_SEND_OPCODE(cqe) && RQ_TYPE(cqe) && t4_rq_empty(wq)) + return 0; + return 1; +} + +void c4iw_count_rcqes(struct t4_cq *cq, struct t4_wq *wq, int *count) +{ + struct t4_cqe *cqe; + u32 ptr; + + *count = 0; + pr_debug("count zero %d\n", *count); + ptr = cq->sw_cidx; + while (ptr != cq->sw_pidx) { + cqe = &cq->sw_queue[ptr]; + if (RQ_TYPE(cqe) && (CQE_OPCODE(cqe) != FW_RI_READ_RESP) && + (CQE_QPID(cqe) == wq->sq.qid) && cqe_completes_wr(cqe, wq)) + (*count)++; + if (++ptr == cq->size) + ptr = 0; + } + pr_debug("cq %p count %d\n", cq, *count); +} + +static void post_pending_srq_wrs(struct t4_srq *srq) +{ + struct t4_srq_pending_wr *pwr; + u16 idx = 0; + + while (srq->pending_in_use) { + pwr = &srq->pending_wrs[srq->pending_cidx]; + srq->sw_rq[srq->pidx].wr_id = pwr->wr_id; + srq->sw_rq[srq->pidx].valid = 1; + + pr_debug("%s posting pending cidx %u pidx %u wq_pidx %u in_use %u rq_size %u wr_id %llx\n", + __func__, + srq->cidx, srq->pidx, srq->wq_pidx, + srq->in_use, srq->size, + (unsigned long long)pwr->wr_id); + + c4iw_copy_wr_to_srq(srq, &pwr->wqe, pwr->len16); + t4_srq_consume_pending_wr(srq); + t4_srq_produce(srq, pwr->len16); + idx += DIV_ROUND_UP(pwr->len16 * 16, T4_EQ_ENTRY_SIZE); + } + + if (idx) { + t4_ring_srq_db(srq, idx, pwr->len16, &pwr->wqe); + srq->queue[srq->size].status.host_wq_pidx = + srq->wq_pidx; + } +} + +static u64 reap_srq_cqe(struct t4_cqe *hw_cqe, struct t4_srq *srq) +{ + int rel_idx = CQE_ABS_RQE_IDX(hw_cqe) - srq->rqt_abs_idx; + u64 wr_id; + + srq->sw_rq[rel_idx].valid = 0; + wr_id = srq->sw_rq[rel_idx].wr_id; + + if (rel_idx == srq->cidx) { + pr_debug("%s in order cqe rel_idx %u cidx %u pidx %u wq_pidx %u in_use %u rq_size %u wr_id %llx\n", + __func__, rel_idx, srq->cidx, srq->pidx, + srq->wq_pidx, srq->in_use, srq->size, + (unsigned long long)srq->sw_rq[rel_idx].wr_id); + t4_srq_consume(srq); + while (srq->ooo_count && !srq->sw_rq[srq->cidx].valid) { + pr_debug("%s eat ooo cidx %u pidx %u wq_pidx %u in_use %u rq_size %u ooo_count %u wr_id %llx\n", + __func__, srq->cidx, srq->pidx, + srq->wq_pidx, srq->in_use, + srq->size, srq->ooo_count, + (unsigned long long) + srq->sw_rq[srq->cidx].wr_id); + t4_srq_consume_ooo(srq); + } + if (srq->ooo_count == 0 && srq->pending_in_use) + post_pending_srq_wrs(srq); + } else { + pr_debug("%s ooo cqe rel_idx %u cidx %u pidx %u wq_pidx %u in_use %u rq_size %u ooo_count %u wr_id %llx\n", + __func__, rel_idx, srq->cidx, + srq->pidx, srq->wq_pidx, + srq->in_use, srq->size, + srq->ooo_count, + (unsigned long long)srq->sw_rq[rel_idx].wr_id); + t4_srq_produce_ooo(srq); + } + return wr_id; +} + +/* + * poll_cq + * + * Caller must: + * check the validity of the first CQE, + * supply the wq assicated with the qpid. + * + * credit: cq credit to return to sge. + * cqe_flushed: 1 iff the CQE is flushed. + * cqe: copy of the polled CQE. + * + * return value: + * 0 CQE returned ok. + * -EAGAIN CQE skipped, try again. + * -EOVERFLOW CQ overflow detected. + */ +static int poll_cq(struct t4_wq *wq, struct t4_cq *cq, struct t4_cqe *cqe, + u8 *cqe_flushed, u64 *cookie, u32 *credit, + struct t4_srq *srq) +{ + int ret = 0; + struct t4_cqe *hw_cqe, read_cqe; + + *cqe_flushed = 0; + *credit = 0; + ret = t4_next_cqe(cq, &hw_cqe); + if (ret) + return ret; + + pr_debug("CQE OVF %u qpid 0x%0x genbit %u type %u status 0x%0x opcode 0x%0x len 0x%0x wrid_hi_stag 0x%x wrid_low_msn 0x%x\n", + CQE_OVFBIT(hw_cqe), CQE_QPID(hw_cqe), + CQE_GENBIT(hw_cqe), CQE_TYPE(hw_cqe), CQE_STATUS(hw_cqe), + CQE_OPCODE(hw_cqe), CQE_LEN(hw_cqe), CQE_WRID_HI(hw_cqe), + CQE_WRID_LOW(hw_cqe)); + + /* + * skip cqe's not affiliated with a QP. + */ + if (wq == NULL) { + ret = -EAGAIN; + goto skip_cqe; + } + + /* + * skip hw cqe's if the wq is flushed. + */ + if (wq->flushed && !SW_CQE(hw_cqe)) { + ret = -EAGAIN; + goto skip_cqe; + } + + /* + * skip TERMINATE cqes... + */ + if (CQE_OPCODE(hw_cqe) == FW_RI_TERMINATE) { + ret = -EAGAIN; + goto skip_cqe; + } + + /* + * Special cqe for drain WR completions... + */ + if (DRAIN_CQE(hw_cqe)) { + *cookie = CQE_DRAIN_COOKIE(hw_cqe); + *cqe = *hw_cqe; + goto skip_cqe; + } + + /* + * Gotta tweak READ completions: + * 1) the cqe doesn't contain the sq_wptr from the wr. + * 2) opcode not reflected from the wr. + * 3) read_len not reflected from the wr. + * 4) cq_type is RQ_TYPE not SQ_TYPE. + */ + if (RQ_TYPE(hw_cqe) && (CQE_OPCODE(hw_cqe) == FW_RI_READ_RESP)) { + + /* If we have reached here because of async + * event or other error, and have egress error + * then drop + */ + if (CQE_TYPE(hw_cqe) == 1) { + if (CQE_STATUS(hw_cqe)) + t4_set_wq_in_error(wq, 0); + ret = -EAGAIN; + goto skip_cqe; + } + + /* If this is an unsolicited read response, then the read + * was generated by the kernel driver as part of peer-2-peer + * connection setup. So ignore the completion. + */ + if (CQE_WRID_STAG(hw_cqe) == 1) { + if (CQE_STATUS(hw_cqe)) + t4_set_wq_in_error(wq, 0); + ret = -EAGAIN; + goto skip_cqe; + } + + /* + * Eat completions for unsignaled read WRs. + */ + if (!wq->sq.oldest_read->signaled) { + advance_oldest_read(wq); + ret = -EAGAIN; + goto skip_cqe; + } + + /* + * Don't write to the HWCQ, so create a new read req CQE + * in local memory. + */ + create_read_req_cqe(wq, hw_cqe, &read_cqe); + hw_cqe = &read_cqe; + advance_oldest_read(wq); + } + + if (CQE_STATUS(hw_cqe) || t4_wq_in_error(wq)) { + *cqe_flushed = (CQE_STATUS(hw_cqe) == T4_ERR_SWFLUSH); + t4_set_wq_in_error(wq, 0); + } + + /* + * RECV completion. + */ + if (RQ_TYPE(hw_cqe)) { + + /* + * HW only validates 4 bits of MSN. So we must validate that + * the MSN in the SEND is the next expected MSN. If its not, + * then we complete this with T4_ERR_MSN and mark the wq in + * error. + */ + if (unlikely(!CQE_STATUS(hw_cqe) && + CQE_WRID_MSN(hw_cqe) != wq->rq.msn)) { + t4_set_wq_in_error(wq, 0); + hw_cqe->header |= cpu_to_be32(CQE_STATUS_V(T4_ERR_MSN)); + } + goto proc_cqe; + } + + /* + * If we get here its a send completion. + * + * Handle out of order completion. These get stuffed + * in the SW SQ. Then the SW SQ is walked to move any + * now in-order completions into the SW CQ. This handles + * 2 cases: + * 1) reaping unsignaled WRs when the first subsequent + * signaled WR is completed. + * 2) out of order read completions. + */ + if (!SW_CQE(hw_cqe) && (CQE_WRID_SQ_IDX(hw_cqe) != wq->sq.cidx)) { + struct t4_swsqe *swsqe; + + pr_debug("out of order completion going in sw_sq at idx %u\n", + CQE_WRID_SQ_IDX(hw_cqe)); + swsqe = &wq->sq.sw_sq[CQE_WRID_SQ_IDX(hw_cqe)]; + swsqe->cqe = *hw_cqe; + swsqe->complete = 1; + ret = -EAGAIN; + goto flush_wq; + } + +proc_cqe: + *cqe = *hw_cqe; + + /* + * Reap the associated WR(s) that are freed up with this + * completion. + */ + if (SQ_TYPE(hw_cqe)) { + int idx = CQE_WRID_SQ_IDX(hw_cqe); + + /* + * Account for any unsignaled completions completed by + * this signaled completion. In this case, cidx points + * to the first unsignaled one, and idx points to the + * signaled one. So adjust in_use based on this delta. + * if this is not completing any unsigned wrs, then the + * delta will be 0. Handle wrapping also! + */ + if (idx < wq->sq.cidx) + wq->sq.in_use -= wq->sq.size + idx - wq->sq.cidx; + else + wq->sq.in_use -= idx - wq->sq.cidx; + + wq->sq.cidx = (uint16_t)idx; + pr_debug("completing sq idx %u\n", wq->sq.cidx); + *cookie = wq->sq.sw_sq[wq->sq.cidx].wr_id; + if (c4iw_wr_log) + c4iw_log_wr_stats(wq, hw_cqe); + t4_sq_consume(wq); + } else { + if (!srq) { + pr_debug("completing rq idx %u\n", wq->rq.cidx); + *cookie = wq->rq.sw_rq[wq->rq.cidx].wr_id; + if (c4iw_wr_log) + c4iw_log_wr_stats(wq, hw_cqe); + t4_rq_consume(wq); + } else { + *cookie = reap_srq_cqe(hw_cqe, srq); + } + wq->rq.msn++; + goto skip_cqe; + } + +flush_wq: + /* + * Flush any completed cqes that are now in-order. + */ + flush_completed_wrs(wq, cq); + +skip_cqe: + if (SW_CQE(hw_cqe)) { + pr_debug("cq %p cqid 0x%x skip sw cqe cidx %u\n", + cq, cq->cqid, cq->sw_cidx); + t4_swcq_consume(cq); + } else { + pr_debug("cq %p cqid 0x%x skip hw cqe cidx %u\n", + cq, cq->cqid, cq->cidx); + t4_hwcq_consume(cq); + } + return ret; +} + +static int __c4iw_poll_cq_one(struct c4iw_cq *chp, struct c4iw_qp *qhp, + struct ib_wc *wc, struct c4iw_srq *srq) +{ + struct t4_cqe cqe; + struct t4_wq *wq = qhp ? &qhp->wq : NULL; + u32 credit = 0; + u8 cqe_flushed; + u64 cookie = 0; + int ret; + + ret = poll_cq(wq, &(chp->cq), &cqe, &cqe_flushed, &cookie, &credit, + srq ? &srq->wq : NULL); + if (ret) + goto out; + + wc->wr_id = cookie; + wc->qp = qhp ? &qhp->ibqp : NULL; + wc->vendor_err = CQE_STATUS(&cqe); + wc->wc_flags = 0; + + /* + * Simulate a SRQ_LIMIT_REACHED HW notification if required. + */ + if (srq && !(srq->flags & T4_SRQ_LIMIT_SUPPORT) && srq->armed && + srq->wq.in_use < srq->srq_limit) + c4iw_dispatch_srq_limit_reached_event(srq); + + pr_debug("qpid 0x%x type %d opcode %d status 0x%x len %u wrid hi 0x%x lo 0x%x cookie 0x%llx\n", + CQE_QPID(&cqe), + CQE_TYPE(&cqe), CQE_OPCODE(&cqe), + CQE_STATUS(&cqe), CQE_LEN(&cqe), + CQE_WRID_HI(&cqe), CQE_WRID_LOW(&cqe), + (unsigned long long)cookie); + + if (CQE_TYPE(&cqe) == 0) { + if (!CQE_STATUS(&cqe)) + wc->byte_len = CQE_LEN(&cqe); + else + wc->byte_len = 0; + + switch (CQE_OPCODE(&cqe)) { + case FW_RI_SEND: + wc->opcode = IB_WC_RECV; + break; + case FW_RI_SEND_WITH_INV: + case FW_RI_SEND_WITH_SE_INV: + wc->opcode = IB_WC_RECV; + wc->ex.invalidate_rkey = CQE_WRID_STAG(&cqe); + wc->wc_flags |= IB_WC_WITH_INVALIDATE; + c4iw_invalidate_mr(qhp->rhp, wc->ex.invalidate_rkey); + break; + case FW_RI_WRITE_IMMEDIATE: + wc->opcode = IB_WC_RECV_RDMA_WITH_IMM; + wc->ex.imm_data = CQE_IMM_DATA(&cqe); + wc->wc_flags |= IB_WC_WITH_IMM; + break; + default: + pr_err("Unexpected opcode %d in the CQE received for QPID=0x%0x\n", + CQE_OPCODE(&cqe), CQE_QPID(&cqe)); + ret = -EINVAL; + goto out; + } + } else { + switch (CQE_OPCODE(&cqe)) { + case FW_RI_WRITE_IMMEDIATE: + case FW_RI_RDMA_WRITE: + wc->opcode = IB_WC_RDMA_WRITE; + break; + case FW_RI_READ_REQ: + wc->opcode = IB_WC_RDMA_READ; + wc->byte_len = CQE_LEN(&cqe); + break; + case FW_RI_SEND_WITH_INV: + case FW_RI_SEND_WITH_SE_INV: + wc->opcode = IB_WC_SEND; + wc->wc_flags |= IB_WC_WITH_INVALIDATE; + break; + case FW_RI_SEND: + case FW_RI_SEND_WITH_SE: + wc->opcode = IB_WC_SEND; + break; + + case FW_RI_LOCAL_INV: + wc->opcode = IB_WC_LOCAL_INV; + break; + case FW_RI_FAST_REGISTER: + wc->opcode = IB_WC_REG_MR; + + /* Invalidate the MR if the fastreg failed */ + if (CQE_STATUS(&cqe) != T4_ERR_SUCCESS) + c4iw_invalidate_mr(qhp->rhp, + CQE_WRID_FR_STAG(&cqe)); + break; + default: + pr_err("Unexpected opcode %d in the CQE received for QPID=0x%0x\n", + CQE_OPCODE(&cqe), CQE_QPID(&cqe)); + ret = -EINVAL; + goto out; + } + } + + if (cqe_flushed) + wc->status = IB_WC_WR_FLUSH_ERR; + else { + + switch (CQE_STATUS(&cqe)) { + case T4_ERR_SUCCESS: + wc->status = IB_WC_SUCCESS; + break; + case T4_ERR_STAG: + wc->status = IB_WC_LOC_ACCESS_ERR; + break; + case T4_ERR_PDID: + wc->status = IB_WC_LOC_PROT_ERR; + break; + case T4_ERR_QPID: + case T4_ERR_ACCESS: + wc->status = IB_WC_LOC_ACCESS_ERR; + break; + case T4_ERR_WRAP: + wc->status = IB_WC_GENERAL_ERR; + break; + case T4_ERR_BOUND: + wc->status = IB_WC_LOC_LEN_ERR; + break; + case T4_ERR_INVALIDATE_SHARED_MR: + case T4_ERR_INVALIDATE_MR_WITH_MW_BOUND: + wc->status = IB_WC_MW_BIND_ERR; + break; + case T4_ERR_CRC: + case T4_ERR_MARKER: + case T4_ERR_PDU_LEN_ERR: + case T4_ERR_OUT_OF_RQE: + case T4_ERR_DDP_VERSION: + case T4_ERR_RDMA_VERSION: + case T4_ERR_DDP_QUEUE_NUM: + case T4_ERR_MSN: + case T4_ERR_TBIT: + case T4_ERR_MO: + case T4_ERR_MSN_RANGE: + case T4_ERR_IRD_OVERFLOW: + case T4_ERR_OPCODE: + case T4_ERR_INTERNAL_ERR: + wc->status = IB_WC_FATAL_ERR; + break; + case T4_ERR_SWFLUSH: + wc->status = IB_WC_WR_FLUSH_ERR; + break; + default: + pr_err("Unexpected cqe_status 0x%x for QPID=0x%0x\n", + CQE_STATUS(&cqe), CQE_QPID(&cqe)); + wc->status = IB_WC_FATAL_ERR; + } + } +out: + return ret; +} + +/* + * Get one cq entry from c4iw and map it to openib. + * + * Returns: + * 0 cqe returned + * -ENODATA EMPTY; + * -EAGAIN caller must try again + * any other -errno fatal error + */ +static int c4iw_poll_cq_one(struct c4iw_cq *chp, struct ib_wc *wc) +{ + struct c4iw_srq *srq = NULL; + struct c4iw_qp *qhp = NULL; + struct t4_cqe *rd_cqe; + int ret; + + ret = t4_next_cqe(&chp->cq, &rd_cqe); + + if (ret) + return ret; + + qhp = get_qhp(chp->rhp, CQE_QPID(rd_cqe)); + if (qhp) { + spin_lock(&qhp->lock); + srq = qhp->srq; + if (srq) + spin_lock(&srq->lock); + ret = __c4iw_poll_cq_one(chp, qhp, wc, srq); + spin_unlock(&qhp->lock); + if (srq) + spin_unlock(&srq->lock); + } else { + ret = __c4iw_poll_cq_one(chp, NULL, wc, NULL); + } + return ret; +} + +int c4iw_poll_cq(struct ib_cq *ibcq, int num_entries, struct ib_wc *wc) +{ + struct c4iw_cq *chp; + unsigned long flags; + int npolled; + int err = 0; + + chp = to_c4iw_cq(ibcq); + + spin_lock_irqsave(&chp->lock, flags); + for (npolled = 0; npolled < num_entries; ++npolled) { + do { + err = c4iw_poll_cq_one(chp, wc + npolled); + } while (err == -EAGAIN); + if (err) + break; + } + spin_unlock_irqrestore(&chp->lock, flags); + return !err || err == -ENODATA ? npolled : err; +} + +int c4iw_destroy_cq(struct ib_cq *ib_cq, struct ib_udata *udata) +{ + struct c4iw_cq *chp; + struct c4iw_ucontext *ucontext; + + pr_debug("ib_cq %p\n", ib_cq); + chp = to_c4iw_cq(ib_cq); + + xa_erase_irq(&chp->rhp->cqs, chp->cq.cqid); + atomic_dec(&chp->refcnt); + wait_event(chp->wait, !atomic_read(&chp->refcnt)); + + ucontext = rdma_udata_to_drv_context(udata, struct c4iw_ucontext, + ibucontext); + destroy_cq(&chp->rhp->rdev, &chp->cq, + ucontext ? &ucontext->uctx : &chp->cq.rdev->uctx, + chp->destroy_skb, chp->wr_waitp); + c4iw_put_wr_wait(chp->wr_waitp); + return 0; +} + +int c4iw_create_cq(struct ib_cq *ibcq, const struct ib_cq_init_attr *attr, + struct ib_udata *udata) +{ + struct ib_device *ibdev = ibcq->device; + int entries = attr->cqe; + int vector = attr->comp_vector; + struct c4iw_dev *rhp = to_c4iw_dev(ibcq->device); + struct c4iw_cq *chp = to_c4iw_cq(ibcq); + struct c4iw_create_cq ucmd; + struct c4iw_create_cq_resp uresp; + int ret, wr_len; + size_t memsize, hwentries; + struct c4iw_mm_entry *mm, *mm2; + struct c4iw_ucontext *ucontext = rdma_udata_to_drv_context( + udata, struct c4iw_ucontext, ibucontext); + + pr_debug("ib_dev %p entries %d\n", ibdev, entries); + if (attr->flags) + return -EINVAL; + + if (entries < 1 || entries > ibdev->attrs.max_cqe) + return -EINVAL; + + if (vector >= rhp->rdev.lldi.nciq) + return -EINVAL; + + if (udata) { + if (udata->inlen < sizeof(ucmd)) + ucontext->is_32b_cqe = 1; + } + + chp->wr_waitp = c4iw_alloc_wr_wait(GFP_KERNEL); + if (!chp->wr_waitp) { + ret = -ENOMEM; + goto err_free_chp; + } + c4iw_init_wr_wait(chp->wr_waitp); + + wr_len = sizeof(struct fw_ri_res_wr) + sizeof(struct fw_ri_res); + chp->destroy_skb = alloc_skb(wr_len, GFP_KERNEL); + if (!chp->destroy_skb) { + ret = -ENOMEM; + goto err_free_wr_wait; + } + + /* account for the status page. */ + entries++; + + /* IQ needs one extra entry to differentiate full vs empty. */ + entries++; + + /* + * entries must be multiple of 16 for HW. + */ + entries = roundup(entries, 16); + + /* + * Make actual HW queue 2x to avoid cdix_inc overflows. + */ + hwentries = min(entries * 2, rhp->rdev.hw_queue.t4_max_iq_size); + + /* + * Make HW queue at least 64 entries so GTS updates aren't too + * frequent. + */ + if (hwentries < 64) + hwentries = 64; + + memsize = hwentries * ((ucontext && ucontext->is_32b_cqe) ? + (sizeof(*chp->cq.queue) / 2) : sizeof(*chp->cq.queue)); + + /* + * memsize must be a multiple of the page size if its a user cq. + */ + if (udata) + memsize = roundup(memsize, PAGE_SIZE); + + chp->cq.size = hwentries; + chp->cq.memsize = memsize; + chp->cq.vector = vector; + + ret = create_cq(&rhp->rdev, &chp->cq, + ucontext ? &ucontext->uctx : &rhp->rdev.uctx, + chp->wr_waitp); + if (ret) + goto err_free_skb; + + chp->rhp = rhp; + chp->cq.size--; /* status page */ + chp->ibcq.cqe = entries - 2; + spin_lock_init(&chp->lock); + spin_lock_init(&chp->comp_handler_lock); + atomic_set(&chp->refcnt, 1); + init_waitqueue_head(&chp->wait); + ret = xa_insert_irq(&rhp->cqs, chp->cq.cqid, chp, GFP_KERNEL); + if (ret) + goto err_destroy_cq; + + if (ucontext) { + ret = -ENOMEM; + mm = kmalloc(sizeof(*mm), GFP_KERNEL); + if (!mm) + goto err_remove_handle; + mm2 = kmalloc(sizeof(*mm2), GFP_KERNEL); + if (!mm2) + goto err_free_mm; + + memset(&uresp, 0, sizeof(uresp)); + uresp.qid_mask = rhp->rdev.cqmask; + uresp.cqid = chp->cq.cqid; + uresp.size = chp->cq.size; + uresp.memsize = chp->cq.memsize; + spin_lock(&ucontext->mmap_lock); + uresp.key = ucontext->key; + ucontext->key += PAGE_SIZE; + uresp.gts_key = ucontext->key; + ucontext->key += PAGE_SIZE; + /* communicate to the userspace that + * kernel driver supports 64B CQE + */ + uresp.flags |= C4IW_64B_CQE; + + spin_unlock(&ucontext->mmap_lock); + ret = ib_copy_to_udata(udata, &uresp, + ucontext->is_32b_cqe ? + sizeof(uresp) - sizeof(uresp.flags) : + sizeof(uresp)); + if (ret) + goto err_free_mm2; + + mm->key = uresp.key; + mm->addr = virt_to_phys(chp->cq.queue); + mm->len = chp->cq.memsize; + insert_mmap(ucontext, mm); + + mm2->key = uresp.gts_key; + mm2->addr = chp->cq.bar2_pa; + mm2->len = PAGE_SIZE; + insert_mmap(ucontext, mm2); + } + + pr_debug("cqid 0x%0x chp %p size %u memsize %zu, dma_addr %pad\n", + chp->cq.cqid, chp, chp->cq.size, chp->cq.memsize, + &chp->cq.dma_addr); + return 0; +err_free_mm2: + kfree(mm2); +err_free_mm: + kfree(mm); +err_remove_handle: + xa_erase_irq(&rhp->cqs, chp->cq.cqid); +err_destroy_cq: + destroy_cq(&chp->rhp->rdev, &chp->cq, + ucontext ? &ucontext->uctx : &rhp->rdev.uctx, + chp->destroy_skb, chp->wr_waitp); +err_free_skb: + kfree_skb(chp->destroy_skb); +err_free_wr_wait: + c4iw_put_wr_wait(chp->wr_waitp); +err_free_chp: + return ret; +} + +int c4iw_arm_cq(struct ib_cq *ibcq, enum ib_cq_notify_flags flags) +{ + struct c4iw_cq *chp; + int ret = 0; + unsigned long flag; + + chp = to_c4iw_cq(ibcq); + spin_lock_irqsave(&chp->lock, flag); + t4_arm_cq(&chp->cq, + (flags & IB_CQ_SOLICITED_MASK) == IB_CQ_SOLICITED); + if (flags & IB_CQ_REPORT_MISSED_EVENTS) + ret = t4_cq_notempty(&chp->cq); + spin_unlock_irqrestore(&chp->lock, flag); + return ret; +} + +void c4iw_flush_srqidx(struct c4iw_qp *qhp, u32 srqidx) +{ + struct c4iw_cq *rchp = to_c4iw_cq(qhp->ibqp.recv_cq); + unsigned long flag; + + /* locking heirarchy: cq lock first, then qp lock. */ + spin_lock_irqsave(&rchp->lock, flag); + spin_lock(&qhp->lock); + + /* create a SRQ RECV CQE for srqidx */ + insert_recv_cqe(&qhp->wq, &rchp->cq, srqidx); + + spin_unlock(&qhp->lock); + spin_unlock_irqrestore(&rchp->lock, flag); +} |