[PATCH v2 07/10] iw_cxgb4: Add CQ management functions.

Steve Wise
2010-04-09T20:54:14Z

drivers/infiniband/hw/cxgb4/cq.c | 882 ++++++++++++++++++++++++++++++++++++++
1 files changed, 882 insertions(+), 0 deletions(-)
create mode 100644 drivers/infiniband/hw/cxgb4/cq.c

diff --git a/drivers/infiniband/hw/cxgb4/cq.c b/drivers/infiniband/hw/cxgb4/cq.c
new file mode 100644
index 0000000..6b4b6f0
--- /dev/null
+++ b/drivers/infiniband/hw/cxgb4/cq.c
@@ -0,0 +1,882 @@
+/*
+ * 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 "iw_cxgb4.h"
+
+static int destroy_cq(struct c4iw_rdev *rdev, struct t4_cq *cq,
+ struct c4iw_dev_ucontext *uctx)
+{
+ struct fw_ri_res_wr *res_wr;
+ struct fw_ri_res *res;
+ int wr_len;
+ struct c4iw_wr_wait wr_wait;
+ struct sk_buff *skb;
+ int ret;
+
+ wr_len = sizeof *res_wr + sizeof *res;
+ skb = alloc_skb(wr_len, GFP_KERNEL | __GFP_NOFAIL);
+ if (!skb)
+ return -ENOMEM;
+ set_wr_txq(skb, CPL_PRIORITY_CONTROL, 0);
+
+ res_wr = (struct fw_ri_res_wr *)__skb_put(skb, wr_len);
+ memset(res_wr, 0, wr_len);
+ res_wr->op_nres = cpu_to_be32(
+ FW_WR_OP(FW_RI_RES_WR) |
+ V_FW_RI_RES_WR_NRES(1) |
+ FW_WR_COMPL(1));
+ res_wr->len16_pkd = cpu_to_be32(DIV_ROUND_UP(wr_len, 16));
+ res_wr->cookie = (u64)&wr_wait;
+ 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_wait);
+ ret = c4iw_ofld_send(rdev, skb);
+ if (!ret) {
+ wait_event_timeout(wr_wait.wait, wr_wait.done, C4IW_WR_TO);
+ if (!wr_wait.done) {
+ printk(KERN_ERR MOD "Device %s not responding!\n",
+ pci_name(rdev->lldi.pdev));
+ rdev->flags = T4_FATAL_ERROR;
+ ret = -EIO;
+ } else
+ ret = wr_wait.ret;
+ }
+
+ kfree(cq->sw_queue);
+ dma_free_coherent(&(rdev->lldi.pdev->dev),
+ cq->memsize, cq->queue,
+ pci_unmap_addr(cq, mapping));
+ c4iw_put_cqid(rdev, cq->cqid, uctx);
+ return ret;
+}
+
+static int create_cq(struct c4iw_rdev *rdev, struct t4_cq *cq,
+ struct c4iw_dev_ucontext *uctx)
+{
+ struct fw_ri_res_wr *res_wr;
+ struct fw_ri_res *res;
+ int wr_len;
+ int user = (uctx != &rdev->uctx);
+ struct c4iw_wr_wait wr_wait;
+ int ret;
+ struct sk_buff *skb;
+
+ 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;
+ }
+ pci_unmap_addr_set(cq, mapping, cq->dma_addr);
+ memset(cq->queue, 0, cq->memsize);
+
+ /* build fw_ri_res_wr */
+ wr_len = sizeof *res_wr + sizeof *res;
+
+ skb = alloc_skb(wr_len, GFP_KERNEL | __GFP_NOFAIL);
+ if (!skb) {
+ ret = -ENOMEM;
+ goto err4;
+ }
+ set_wr_txq(skb, CPL_PRIORITY_CONTROL, 0);
+
+ res_wr = (struct fw_ri_res_wr *)__skb_put(skb, wr_len);
+ memset(res_wr, 0, wr_len);
+ res_wr->op_nres = cpu_to_be32(
+ FW_WR_OP(FW_RI_RES_WR) |
+ V_FW_RI_RES_WR_NRES(1) |
+ FW_WR_COMPL(1));
+ res_wr->len16_pkd = cpu_to_be32(DIV_ROUND_UP(wr_len, 16));
+ res_wr->cookie = (u64)&wr_wait;
+ 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(
+ V_FW_RI_RES_WR_IQANUS(0) |
+ V_FW_RI_RES_WR_IQANUD(1) |
+ F_FW_RI_RES_WR_IQANDST |
+ V_FW_RI_RES_WR_IQANDSTINDEX(*rdev->lldi.rxq_ids));
+ res->u.cq.iqdroprss_to_iqesize = cpu_to_be16(
+ F_FW_RI_RES_WR_IQDROPRSS |
+ V_FW_RI_RES_WR_IQPCIECH(2) |
+ V_FW_RI_RES_WR_IQINTCNTTHRESH(0) |
+ F_FW_RI_RES_WR_IQO |
+ V_FW_RI_RES_WR_IQESIZE(1));
+ res->u.cq.iqsize = cpu_to_be16(cq->size);
+ res->u.cq.iqaddr = cpu_to_be64(cq->dma_addr);
+
+ c4iw_init_wr_wait(&wr_wait);
+
+ ret = c4iw_ofld_send(rdev, skb);
+ if (ret)
+ goto err4;
+ PDBG("%s wait_event wr_wait %p\n", __func__, &wr_wait);
+ wait_event_timeout(wr_wait.wait, wr_wait.done, C4IW_WR_TO);
+ if (!wr_wait.done) {
+ printk(KERN_ERR MOD "Device %s not responding!\n",
+ pci_name(rdev->lldi.pdev));
+ rdev->flags = T4_FATAL_ERROR;
+ ret = -EIO;
+ } else
+ ret = wr_wait.ret;
+ if (ret)
+ goto err4;
+
+ cq->gen = 1;
+ cq->gts = rdev->lldi.gts_reg;
+ cq->rdev = rdev;
+ if (user) {
+ cq->ugts = (u64)pci_resource_start(rdev->lldi.pdev, 2) +
+ (cq->cqid << rdev->cqshift);
+ cq->ugts &= PAGE_MASK;
+ }
+ return 0;
+err4:
+ dma_free_coherent(&rdev->lldi.pdev->dev, cq->memsize, cq->queue,
+ pci_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)
+{
+ struct t4_cqe cqe;
+
+ PDBG("%s wq %p cq %p sw_cidx %u sw_pidx %u\n", __func__,
+ wq, cq, cq->sw_cidx, cq->sw_pidx);
+ memset(&cqe, 0, sizeof(cqe));
+ cqe.header = cpu_to_be32(V_CQE_STATUS(T4_ERR_SWFLUSH) |
+ V_CQE_OPCODE(FW_RI_SEND) |
+ V_CQE_TYPE(0) |
+ V_CQE_SWCQE(1) |
+ V_CQE_QPID(wq->rq.qid));
+ cqe.bits_type_ts = cpu_to_be64(V_CQE_GENBIT((u64)cq->gen));
+ 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;
+
+ BUG_ON(in_use < 0);
+ PDBG("%s wq %p cq %p rq.in_use %u skip count %u\n", __func__,
+ wq, cq, wq->rq.in_use, count);
+ while (in_use--) {
+ insert_recv_cqe(wq, cq);
+ flushed++;
+ }
+ return flushed;
+}
+
+static void insert_sq_cqe(struct t4_wq *wq, struct t4_cq *cq,
+ struct t4_swsqe *swcqe)
+{
+ struct t4_cqe cqe;
+
+ PDBG("%s wq %p cq %p sw_cidx %u sw_pidx %u\n", __func__,
+ wq, cq, cq->sw_cidx, cq->sw_pidx);
+ memset(&cqe, 0, sizeof(cqe));
+ cqe.header = cpu_to_be32(V_CQE_STATUS(T4_ERR_SWFLUSH) |
+ V_CQE_OPCODE(swcqe->opcode) |
+ V_CQE_TYPE(1) |
+ V_CQE_SWCQE(1) |
+ V_CQE_QPID(wq->sq.qid));
+ CQE_WRID_SQ_IDX(&cqe) = swcqe->idx;
+ cqe.bits_type_ts = cpu_to_be64(V_CQE_GENBIT((u64)cq->gen));
+ cq->sw_queue[cq->sw_pidx] = cqe;
+ t4_swcq_produce(cq);
+}
+
+int c4iw_flush_sq(struct t4_wq *wq, struct t4_cq *cq, int count)
+{
+ int flushed = 0;
+ struct t4_swsqe *swsqe = &wq->sq.sw_sq[wq->sq.cidx + count];
+ int in_use = wq->sq.in_use - count;
+
+ BUG_ON(in_use < 0);
+ while (in_use--) {
+ swsqe->signaled = 0;
+ insert_sq_cqe(wq, cq, swsqe);
+ swsqe++;
+ if (swsqe == (wq->sq.sw_sq + wq->sq.size))
+ swsqe = wq->sq.sw_sq;
+ flushed++;
+ }
+ return flushed;
+}
+
+/*
+ * Move all CQEs from the HWCQ into the SWCQ.
+ */
+void c4iw_flush_hw_cq(struct t4_cq *cq)
+{
+ struct t4_cqe *cqe = NULL, *swcqe;
+ int ret;
+
+ PDBG("%s cq %p cqid 0x%x\n", __func__, cq, cq->cqid);
+ ret = t4_next_hw_cqe(cq, &cqe);
+ while (!ret) {
+ PDBG("%s flushing hwcq cidx 0x%x swcq pidx 0x%x\n",
+ __func__, cq->cidx, cq->sw_pidx);
+ swcqe = &cq->sw_queue[cq->sw_pidx];
+ *swcqe = *cqe;
+ swcqe->header |= cpu_to_be32(V_CQE_SWCQE(1));
+ t4_swcq_produce(cq);
+ t4_hwcq_consume(cq);
+ ret = t4_next_hw_cqe(cq, &cqe);
+ }
+}
+
+static int cqe_completes_wr(struct t4_cqe *cqe, struct t4_wq *wq)
+{
+ 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_scqes(struct t4_cq *cq, struct t4_wq *wq, int *count)
+{
+ struct t4_cqe *cqe;
+ u32 ptr;
+
+ *count = 0;
+ ptr = cq->sw_cidx;
+ while (ptr != cq->sw_pidx) {
+ cqe = &cq->sw_queue[ptr];
+ if ((SQ_TYPE(cqe) || ((CQE_OPCODE(cqe) == FW_RI_READ_RESP) &&
+ wq->sq.oldest_read)) &&
+ (CQE_QPID(cqe) == wq->sq.qid))
+ (*count)++;
+ if (++ptr == cq->size)
+ ptr = 0;
+ }
+ PDBG("%s cq %p count %d\n", __func__, cq, *count);
+}
+
+void c4iw_count_rcqes(struct t4_cq *cq, struct t4_wq *wq, int *count)
+{
+ struct t4_cqe *cqe;
+ u32 ptr;
+
+ *count = 0;
+ PDBG("%s count zero %d\n", __func__, *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->rq.qid) && cqe_completes_wr(cqe, wq))
+ (*count)++;
+ if (++ptr == cq->size)
+ ptr = 0;
+ }
+ PDBG("%s cq %p count %d\n", __func__, cq, *count);
+}
+
+static void flush_completed_wrs(struct t4_wq *wq, struct t4_cq *cq)
+{
+ struct t4_swsqe *swsqe;
+ u16 ptr = wq->sq.cidx;
+ int count = wq->sq.in_use;
+ int unsignaled = 0;
+
+ swsqe = &wq->sq.sw_sq[ptr];
+ while (count--)
+ if (!swsqe->signaled) {
+ if (++ptr == wq->sq.size)
+ ptr = 0;
+ swsqe = &wq->sq.sw_sq[ptr];
+ unsignaled++;
+ } else if (swsqe->complete) {
+
+ /*
+ * Insert this completed cqe into the swcq.
+ */
+ PDBG("%s moving cqe into swcq sq idx %u cq idx %u\n",
+ __func__, ptr, cq->sw_pidx);
+ swsqe->cqe.header |= htonl(V_CQE_SWCQE(1));
+ cq->sw_queue[cq->sw_pidx] = swsqe->cqe;
+ t4_swcq_produce(cq);
+ swsqe->signaled = 0;
+ wq->sq.in_use -= unsignaled;
+ break;
+ } 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 = cpu_to_be32(wq->sq.oldest_read->read_len);
+ read_cqe->header = htonl(V_CQE_QPID(CQE_QPID(hw_cqe)) |
+ V_CQE_SWCQE(SW_CQE(hw_cqe)) |
+ V_CQE_OPCODE(FW_RI_READ_REQ) |
+ V_CQE_TYPE(1));
+}
+
+/*
+ * Return a ptr to the next read wr in the SWSQ or NULL.
+ */
+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;
+}
+
+/*
+ * 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)
+{
+ 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;
+
+ PDBG("%s 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",
+ __func__, 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;
+ }
+
+ /*
+ * 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 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 (!wq->sq.oldest_read) {
+ if (CQE_STATUS(hw_cqe))
+ t4_set_wq_in_error(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 = t4_wq_in_error(wq);
+ t4_set_wq_in_error(wq);
+ goto proc_cqe;
+ }
+
+ /*
+ * 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 (t4_rq_empty(wq)) {
+ t4_set_wq_in_error(wq);
+ ret = -EAGAIN;
+ goto skip_cqe;
+ }
+ if (unlikely((CQE_WRID_MSN(hw_cqe) != (wq->rq.msn)))) {
+ t4_set_wq_in_error(wq);
+ hw_cqe->header |= htonl(V_CQE_STATUS(T4_ERR_MSN));
+ goto proc_cqe;
+ }
+ 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;
+
+ PDBG("%s out of order completion going in sw_sq at idx %u\n",
+ __func__, 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)) {
+ wq->sq.cidx = CQE_WRID_SQ_IDX(hw_cqe);
+ PDBG("%s completing sq idx %u\n", __func__, wq->sq.cidx);
+ *cookie = wq->sq.sw_sq[wq->sq.cidx].wr_id;
+ t4_sq_consume(wq);
+ } else {
+ PDBG("%s completing rq idx %u\n", __func__, wq->rq.cidx);
+ *cookie = wq->rq.sw_rq[wq->rq.cidx].wr_id;
+ BUG_ON(t4_rq_empty(wq));
+ t4_rq_consume(wq);
+ }
+
+flush_wq:
+ /*
+ * Flush any completed cqes that are now in-order.
+ */
+ flush_completed_wrs(wq, cq);
+
+skip_cqe:
+ if (SW_CQE(hw_cqe)) {
+ PDBG("%s cq %p cqid 0x%x skip sw cqe cidx %u\n",
+ __func__, cq, cq->cqid, cq->sw_cidx);
+ t4_swcq_consume(cq);
+ } else {
+ PDBG("%s cq %p cqid 0x%x skip hw cqe cidx %u\n",
+ __func__, cq, cq->cqid, cq->cidx);
+ t4_hwcq_consume(cq);
+ }
+ 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_qp *qhp = NULL;
+ struct t4_cqe cqe = {0, 0}, *rd_cqe;
+ struct t4_wq *wq;
+ u32 credit = 0;
+ u8 cqe_flushed;
+ u64 cookie = 0;
+ 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)
+ wq = NULL;
+ else {
+ spin_lock(&qhp->lock);
+ wq = &(qhp->wq);
+ }
+ ret = poll_cq(wq, &(chp->cq), &cqe, &cqe_flushed, &cookie, &credit);
+ if (ret)
+ goto out;
+
+ wc->wr_id = cookie;
+ wc->qp = &qhp->ibqp;
+ wc->vendor_err = CQE_STATUS(&cqe);
+ wc->wc_flags = 0;
+
+ PDBG("%s qpid 0x%x type %d opcode %d status 0x%x len %u wrid hi 0x%x "
+ "lo 0x%x cookie 0x%llx\n", __func__, 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;
+ wc->opcode = IB_WC_RECV;
+ if (CQE_OPCODE(&cqe) == FW_RI_SEND_WITH_INV ||
+ CQE_OPCODE(&cqe) == FW_RI_SEND_WITH_SE_INV) {
+ wc->ex.invalidate_rkey = CQE_WRID_STAG(&cqe);
+ wc->wc_flags |= IB_WC_WITH_INVALIDATE;
+ }
+ } else {
+ switch (CQE_OPCODE(&cqe)) {
+ 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_BIND_MW:
+ wc->opcode = IB_WC_BIND_MW;
+ break;
+
+ case FW_RI_LOCAL_INV:
+ wc->opcode = IB_WC_LOCAL_INV;
+ break;
+ case FW_RI_FAST_REGISTER:
+ wc->opcode = IB_WC_FAST_REG_MR;
+ break;
+ default:
+ printk(KERN_ERR MOD "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:
+ wc->status = IB_WC_FATAL_ERR;
+ break;
+ case T4_ERR_SWFLUSH:
+ wc->status = IB_WC_WR_FLUSH_ERR;
+ break;
+ default:
+ printk(KERN_ERR MOD
+ "Unexpected cqe_status 0x%x for QPID=0x%0x\n",
+ CQE_STATUS(&cqe), CQE_QPID(&cqe));
+ ret = -EINVAL;
+ }
+ }
+out:
+ if (wq)
+ spin_unlock(&qhp->lock);
+ 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 c4iw_cq *chp;
+ struct c4iw_ucontext *ucontext;
+
+ PDBG("%s ib_cq %p\n", __func__, ib_cq);
+ chp = to_c4iw_cq(ib_cq);
+
+ remove_handle(chp->rhp, &chp->rhp->cqidr, chp->cq.cqid);
+ atomic_dec(&chp->refcnt);
+ wait_event(chp->wait, !atomic_read(&chp->refcnt));
+
+ ucontext = ib_cq->uobject ? to_c4iw_ucontext(ib_cq->uobject->context)
+ : NULL;
+ destroy_cq(&chp->rhp->rdev, &chp->cq,
+ ucontext ? &ucontext->uctx : &chp->cq.rdev->uctx);
+ kfree(chp);
+ return 0;
+}
+
+struct ib_cq *c4iw_create_cq(struct ib_device *ibdev, int entries,
+ int vector, struct ib_ucontext *ib_context,
+ struct ib_udata *udata)
+{
+ struct c4iw_dev *rhp;
+ struct c4iw_cq *chp;
+ struct c4iw_create_cq_resp uresp;
+ struct c4iw_ucontext *ucontext = NULL;
+ int ret;
+ size_t memsize;
+ struct c4iw_mm_entry *mm, *mm2;
+
+ PDBG("%s ib_dev %p entries %d\n", __func__, ibdev, entries);
+
+ rhp = to_c4iw_dev(ibdev);
+
+ chp = kzalloc(sizeof(*chp), GFP_KERNEL);
+ if (!chp)
+ return ERR_PTR(-ENOMEM);
+
+ if (ib_context)
+ ucontext = to_c4iw_ucontext(ib_context);
+
+ /* account for the status page. */
+ entries++;
+
+ /*
+ * entries must be multiple of 16 for HW.
+ */
+ entries = roundup(entries, 16);
+ memsize = entries * sizeof *chp->cq.queue;
+
+ /*
+ * memsize must be a multiple of the page size if its a user cq.
+ */
+ if (ucontext)
+ memsize = roundup(memsize, PAGE_SIZE);
+ chp->cq.size = entries;
+ chp->cq.memsize = memsize;
+
+ ret = create_cq(&rhp->rdev, &chp->cq,
+ ucontext ? &ucontext->uctx : &rhp->rdev.uctx);
+ if (ret)
+ goto err1;
+
+ chp->rhp = rhp;
+ chp->cq.size--; /* status page */
+ chp->ibcq.cqe = chp->cq.size;
+ spin_lock_init(&chp->lock);
+ atomic_set(&chp->refcnt, 1);
+ init_waitqueue_head(&chp->wait);
+ ret = insert_handle(rhp, &rhp->cqidr, chp, chp->cq.cqid);
+ if (ret)
+ goto err2;
+
+ if (ucontext) {
+ mm = kmalloc(sizeof *mm, GFP_KERNEL);
+ if (!mm)
+ goto err3;
+ mm2 = kmalloc(sizeof *mm2, GFP_KERNEL);
+ if (!mm2)
+ goto err4;
+
+ 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;
+ spin_unlock(&ucontext->mmap_lock);
+ ret = ib_copy_to_udata(udata, &uresp, sizeof uresp);
+ if (ret)
+ goto err5;
+
+ 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.ugts;
+ mm2->len = PAGE_SIZE;
+ insert_mmap(ucontext, mm2);
+ }
+ PDBG("%s cqid 0x%0x chp %p size %u memsize %lu, dma_addr 0x%0llx\n",
+ __func__, chp->cq.cqid, chp, chp->cq.size,
+ chp->cq.memsize,
+ (unsigned long long) chp->cq.dma_addr);
+ return &chp->ibcq;
+err5:
+ kfree(mm2);
+err4:
+ kfree(mm);
+err3:
+ remove_handle(rhp, &rhp->cqidr, chp->cq.cqid);
+err2:
+ destroy_cq(&chp->rhp->rdev, &chp->cq,
+ ucontext ? &ucontext->uctx : &rhp->rdev.uctx);
+err1:
+ kfree(chp);
+ return ERR_PTR(ret);
+}
+
+int c4iw_resize_cq(struct ib_cq *cq, int cqe, struct ib_udata *udata)
+{
+ return -ENOSYS;
+}
+
+int c4iw_arm_cq(struct ib_cq *ibcq, enum ib_cq_notify_flags flags)
+{
+ struct c4iw_cq *chp;
+ int ret;
+ unsigned long flag;
+
+ chp = to_c4iw_cq(ibcq);
+ spin_lock_irqsave(&chp->lock, flag);
+ ret = t4_arm_cq(&chp->cq,
+ (flags & IB_CQ_SOLICITED_MASK) == IB_CQ_SOLICITED);
+ spin_unlock_irqrestore(&chp->lock, flag);
+ if (ret && !(flags & IB_CQ_REPORT_MISSED_EVENTS))
+ ret = 0;