| /* |
| * Copyright (c) 2014 Open Grid Computing, Inc. All rights reserved. |
| * Copyright (c) 2005-2007 Network Appliance, 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 BSD-type |
| * 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. |
| * |
| * Neither the name of the Network Appliance, Inc. nor the names of |
| * its contributors may be used to endorse or promote products |
| * derived from this software without specific prior written |
| * permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| * |
| * Author: Tom Tucker <tom@opengridcomputing.com> |
| */ |
| |
| #include <linux/sunrpc/svc_xprt.h> |
| #include <linux/sunrpc/addr.h> |
| #include <linux/sunrpc/debug.h> |
| #include <linux/sunrpc/rpc_rdma.h> |
| #include <linux/interrupt.h> |
| #include <linux/sched.h> |
| #include <linux/slab.h> |
| #include <linux/spinlock.h> |
| #include <linux/workqueue.h> |
| #include <rdma/ib_verbs.h> |
| #include <rdma/rdma_cm.h> |
| #include <linux/sunrpc/svc_rdma.h> |
| #include <linux/export.h> |
| #include "xprt_rdma.h" |
| |
| #define RPCDBG_FACILITY RPCDBG_SVCXPRT |
| |
| static struct svcxprt_rdma *rdma_create_xprt(struct svc_serv *, int); |
| static struct svc_xprt *svc_rdma_create(struct svc_serv *serv, |
| struct net *net, |
| struct sockaddr *sa, int salen, |
| int flags); |
| static struct svc_xprt *svc_rdma_accept(struct svc_xprt *xprt); |
| static void svc_rdma_release_rqst(struct svc_rqst *); |
| static void svc_rdma_detach(struct svc_xprt *xprt); |
| static void svc_rdma_free(struct svc_xprt *xprt); |
| static int svc_rdma_has_wspace(struct svc_xprt *xprt); |
| static int svc_rdma_secure_port(struct svc_rqst *); |
| static void svc_rdma_kill_temp_xprt(struct svc_xprt *); |
| |
| static struct svc_xprt_ops svc_rdma_ops = { |
| .xpo_create = svc_rdma_create, |
| .xpo_recvfrom = svc_rdma_recvfrom, |
| .xpo_sendto = svc_rdma_sendto, |
| .xpo_release_rqst = svc_rdma_release_rqst, |
| .xpo_detach = svc_rdma_detach, |
| .xpo_free = svc_rdma_free, |
| .xpo_prep_reply_hdr = svc_rdma_prep_reply_hdr, |
| .xpo_has_wspace = svc_rdma_has_wspace, |
| .xpo_accept = svc_rdma_accept, |
| .xpo_secure_port = svc_rdma_secure_port, |
| .xpo_kill_temp_xprt = svc_rdma_kill_temp_xprt, |
| }; |
| |
| struct svc_xprt_class svc_rdma_class = { |
| .xcl_name = "rdma", |
| .xcl_owner = THIS_MODULE, |
| .xcl_ops = &svc_rdma_ops, |
| .xcl_max_payload = RPCSVC_MAXPAYLOAD_RDMA, |
| .xcl_ident = XPRT_TRANSPORT_RDMA, |
| }; |
| |
| #if defined(CONFIG_SUNRPC_BACKCHANNEL) |
| static struct svc_xprt *svc_rdma_bc_create(struct svc_serv *, struct net *, |
| struct sockaddr *, int, int); |
| static void svc_rdma_bc_detach(struct svc_xprt *); |
| static void svc_rdma_bc_free(struct svc_xprt *); |
| |
| static struct svc_xprt_ops svc_rdma_bc_ops = { |
| .xpo_create = svc_rdma_bc_create, |
| .xpo_detach = svc_rdma_bc_detach, |
| .xpo_free = svc_rdma_bc_free, |
| .xpo_prep_reply_hdr = svc_rdma_prep_reply_hdr, |
| .xpo_secure_port = svc_rdma_secure_port, |
| }; |
| |
| struct svc_xprt_class svc_rdma_bc_class = { |
| .xcl_name = "rdma-bc", |
| .xcl_owner = THIS_MODULE, |
| .xcl_ops = &svc_rdma_bc_ops, |
| .xcl_max_payload = (1024 - RPCRDMA_HDRLEN_MIN) |
| }; |
| |
| static struct svc_xprt *svc_rdma_bc_create(struct svc_serv *serv, |
| struct net *net, |
| struct sockaddr *sa, int salen, |
| int flags) |
| { |
| struct svcxprt_rdma *cma_xprt; |
| struct svc_xprt *xprt; |
| |
| cma_xprt = rdma_create_xprt(serv, 0); |
| if (!cma_xprt) |
| return ERR_PTR(-ENOMEM); |
| xprt = &cma_xprt->sc_xprt; |
| |
| svc_xprt_init(net, &svc_rdma_bc_class, xprt, serv); |
| set_bit(XPT_CONG_CTRL, &xprt->xpt_flags); |
| serv->sv_bc_xprt = xprt; |
| |
| dprintk("svcrdma: %s(%p)\n", __func__, xprt); |
| return xprt; |
| } |
| |
| static void svc_rdma_bc_detach(struct svc_xprt *xprt) |
| { |
| dprintk("svcrdma: %s(%p)\n", __func__, xprt); |
| } |
| |
| static void svc_rdma_bc_free(struct svc_xprt *xprt) |
| { |
| struct svcxprt_rdma *rdma = |
| container_of(xprt, struct svcxprt_rdma, sc_xprt); |
| |
| dprintk("svcrdma: %s(%p)\n", __func__, xprt); |
| if (xprt) |
| kfree(rdma); |
| } |
| #endif /* CONFIG_SUNRPC_BACKCHANNEL */ |
| |
| static struct svc_rdma_op_ctxt *alloc_ctxt(struct svcxprt_rdma *xprt, |
| gfp_t flags) |
| { |
| struct svc_rdma_op_ctxt *ctxt; |
| |
| ctxt = kmalloc(sizeof(*ctxt), flags); |
| if (ctxt) { |
| ctxt->xprt = xprt; |
| INIT_LIST_HEAD(&ctxt->list); |
| } |
| return ctxt; |
| } |
| |
| static bool svc_rdma_prealloc_ctxts(struct svcxprt_rdma *xprt) |
| { |
| unsigned int i; |
| |
| /* Each RPC/RDMA credit can consume a number of send |
| * and receive WQEs. One ctxt is allocated for each. |
| */ |
| i = xprt->sc_sq_depth + xprt->sc_rq_depth; |
| |
| while (i--) { |
| struct svc_rdma_op_ctxt *ctxt; |
| |
| ctxt = alloc_ctxt(xprt, GFP_KERNEL); |
| if (!ctxt) { |
| dprintk("svcrdma: No memory for RDMA ctxt\n"); |
| return false; |
| } |
| list_add(&ctxt->list, &xprt->sc_ctxts); |
| } |
| return true; |
| } |
| |
| struct svc_rdma_op_ctxt *svc_rdma_get_context(struct svcxprt_rdma *xprt) |
| { |
| struct svc_rdma_op_ctxt *ctxt = NULL; |
| |
| spin_lock(&xprt->sc_ctxt_lock); |
| xprt->sc_ctxt_used++; |
| if (list_empty(&xprt->sc_ctxts)) |
| goto out_empty; |
| |
| ctxt = list_first_entry(&xprt->sc_ctxts, |
| struct svc_rdma_op_ctxt, list); |
| list_del(&ctxt->list); |
| spin_unlock(&xprt->sc_ctxt_lock); |
| |
| out: |
| ctxt->count = 0; |
| ctxt->mapped_sges = 0; |
| ctxt->frmr = NULL; |
| return ctxt; |
| |
| out_empty: |
| /* Either pre-allocation missed the mark, or send |
| * queue accounting is broken. |
| */ |
| spin_unlock(&xprt->sc_ctxt_lock); |
| |
| ctxt = alloc_ctxt(xprt, GFP_NOIO); |
| if (ctxt) |
| goto out; |
| |
| spin_lock(&xprt->sc_ctxt_lock); |
| xprt->sc_ctxt_used--; |
| spin_unlock(&xprt->sc_ctxt_lock); |
| WARN_ONCE(1, "svcrdma: empty RDMA ctxt list?\n"); |
| return NULL; |
| } |
| |
| void svc_rdma_unmap_dma(struct svc_rdma_op_ctxt *ctxt) |
| { |
| struct svcxprt_rdma *xprt = ctxt->xprt; |
| struct ib_device *device = xprt->sc_cm_id->device; |
| u32 lkey = xprt->sc_pd->local_dma_lkey; |
| unsigned int i; |
| |
| for (i = 0; i < ctxt->mapped_sges; i++) { |
| /* |
| * Unmap the DMA addr in the SGE if the lkey matches |
| * the local_dma_lkey, otherwise, ignore it since it is |
| * an FRMR lkey and will be unmapped later when the |
| * last WR that uses it completes. |
| */ |
| if (ctxt->sge[i].lkey == lkey) |
| ib_dma_unmap_page(device, |
| ctxt->sge[i].addr, |
| ctxt->sge[i].length, |
| ctxt->direction); |
| } |
| ctxt->mapped_sges = 0; |
| } |
| |
| void svc_rdma_put_context(struct svc_rdma_op_ctxt *ctxt, int free_pages) |
| { |
| struct svcxprt_rdma *xprt = ctxt->xprt; |
| int i; |
| |
| if (free_pages) |
| for (i = 0; i < ctxt->count; i++) |
| put_page(ctxt->pages[i]); |
| |
| spin_lock(&xprt->sc_ctxt_lock); |
| xprt->sc_ctxt_used--; |
| list_add(&ctxt->list, &xprt->sc_ctxts); |
| spin_unlock(&xprt->sc_ctxt_lock); |
| } |
| |
| static void svc_rdma_destroy_ctxts(struct svcxprt_rdma *xprt) |
| { |
| while (!list_empty(&xprt->sc_ctxts)) { |
| struct svc_rdma_op_ctxt *ctxt; |
| |
| ctxt = list_first_entry(&xprt->sc_ctxts, |
| struct svc_rdma_op_ctxt, list); |
| list_del(&ctxt->list); |
| kfree(ctxt); |
| } |
| } |
| |
| /* QP event handler */ |
| static void qp_event_handler(struct ib_event *event, void *context) |
| { |
| struct svc_xprt *xprt = context; |
| |
| switch (event->event) { |
| /* These are considered benign events */ |
| case IB_EVENT_PATH_MIG: |
| case IB_EVENT_COMM_EST: |
| case IB_EVENT_SQ_DRAINED: |
| case IB_EVENT_QP_LAST_WQE_REACHED: |
| dprintk("svcrdma: QP event %s (%d) received for QP=%p\n", |
| ib_event_msg(event->event), event->event, |
| event->element.qp); |
| break; |
| /* These are considered fatal events */ |
| case IB_EVENT_PATH_MIG_ERR: |
| case IB_EVENT_QP_FATAL: |
| case IB_EVENT_QP_REQ_ERR: |
| case IB_EVENT_QP_ACCESS_ERR: |
| case IB_EVENT_DEVICE_FATAL: |
| default: |
| dprintk("svcrdma: QP ERROR event %s (%d) received for QP=%p, " |
| "closing transport\n", |
| ib_event_msg(event->event), event->event, |
| event->element.qp); |
| set_bit(XPT_CLOSE, &xprt->xpt_flags); |
| break; |
| } |
| } |
| |
| /** |
| * svc_rdma_wc_receive - Invoked by RDMA provider for each polled Receive WC |
| * @cq: completion queue |
| * @wc: completed WR |
| * |
| */ |
| static void svc_rdma_wc_receive(struct ib_cq *cq, struct ib_wc *wc) |
| { |
| struct svcxprt_rdma *xprt = cq->cq_context; |
| struct ib_cqe *cqe = wc->wr_cqe; |
| struct svc_rdma_op_ctxt *ctxt; |
| |
| /* WARNING: Only wc->wr_cqe and wc->status are reliable */ |
| ctxt = container_of(cqe, struct svc_rdma_op_ctxt, cqe); |
| svc_rdma_unmap_dma(ctxt); |
| |
| if (wc->status != IB_WC_SUCCESS) |
| goto flushed; |
| |
| /* All wc fields are now known to be valid */ |
| ctxt->byte_len = wc->byte_len; |
| spin_lock(&xprt->sc_rq_dto_lock); |
| list_add_tail(&ctxt->list, &xprt->sc_rq_dto_q); |
| spin_unlock(&xprt->sc_rq_dto_lock); |
| |
| set_bit(XPT_DATA, &xprt->sc_xprt.xpt_flags); |
| if (test_bit(RDMAXPRT_CONN_PENDING, &xprt->sc_flags)) |
| goto out; |
| svc_xprt_enqueue(&xprt->sc_xprt); |
| goto out; |
| |
| flushed: |
| if (wc->status != IB_WC_WR_FLUSH_ERR) |
| pr_warn("svcrdma: receive: %s (%u/0x%x)\n", |
| ib_wc_status_msg(wc->status), |
| wc->status, wc->vendor_err); |
| set_bit(XPT_CLOSE, &xprt->sc_xprt.xpt_flags); |
| svc_rdma_put_context(ctxt, 1); |
| |
| out: |
| svc_xprt_put(&xprt->sc_xprt); |
| } |
| |
| static void svc_rdma_send_wc_common(struct svcxprt_rdma *xprt, |
| struct ib_wc *wc, |
| const char *opname) |
| { |
| if (wc->status != IB_WC_SUCCESS) |
| goto err; |
| |
| out: |
| atomic_inc(&xprt->sc_sq_avail); |
| wake_up(&xprt->sc_send_wait); |
| return; |
| |
| err: |
| set_bit(XPT_CLOSE, &xprt->sc_xprt.xpt_flags); |
| if (wc->status != IB_WC_WR_FLUSH_ERR) |
| pr_err("svcrdma: %s: %s (%u/0x%x)\n", |
| opname, ib_wc_status_msg(wc->status), |
| wc->status, wc->vendor_err); |
| goto out; |
| } |
| |
| static void svc_rdma_send_wc_common_put(struct ib_cq *cq, struct ib_wc *wc, |
| const char *opname) |
| { |
| struct svcxprt_rdma *xprt = cq->cq_context; |
| |
| svc_rdma_send_wc_common(xprt, wc, opname); |
| svc_xprt_put(&xprt->sc_xprt); |
| } |
| |
| /** |
| * svc_rdma_wc_send - Invoked by RDMA provider for each polled Send WC |
| * @cq: completion queue |
| * @wc: completed WR |
| * |
| */ |
| void svc_rdma_wc_send(struct ib_cq *cq, struct ib_wc *wc) |
| { |
| struct ib_cqe *cqe = wc->wr_cqe; |
| struct svc_rdma_op_ctxt *ctxt; |
| |
| svc_rdma_send_wc_common_put(cq, wc, "send"); |
| |
| ctxt = container_of(cqe, struct svc_rdma_op_ctxt, cqe); |
| svc_rdma_unmap_dma(ctxt); |
| svc_rdma_put_context(ctxt, 1); |
| } |
| |
| /** |
| * svc_rdma_wc_reg - Invoked by RDMA provider for each polled FASTREG WC |
| * @cq: completion queue |
| * @wc: completed WR |
| * |
| */ |
| void svc_rdma_wc_reg(struct ib_cq *cq, struct ib_wc *wc) |
| { |
| svc_rdma_send_wc_common_put(cq, wc, "fastreg"); |
| } |
| |
| /** |
| * svc_rdma_wc_read - Invoked by RDMA provider for each polled Read WC |
| * @cq: completion queue |
| * @wc: completed WR |
| * |
| */ |
| void svc_rdma_wc_read(struct ib_cq *cq, struct ib_wc *wc) |
| { |
| struct svcxprt_rdma *xprt = cq->cq_context; |
| struct ib_cqe *cqe = wc->wr_cqe; |
| struct svc_rdma_op_ctxt *ctxt; |
| |
| svc_rdma_send_wc_common(xprt, wc, "read"); |
| |
| ctxt = container_of(cqe, struct svc_rdma_op_ctxt, cqe); |
| svc_rdma_unmap_dma(ctxt); |
| svc_rdma_put_frmr(xprt, ctxt->frmr); |
| |
| if (test_bit(RDMACTXT_F_LAST_CTXT, &ctxt->flags)) { |
| struct svc_rdma_op_ctxt *read_hdr; |
| |
| read_hdr = ctxt->read_hdr; |
| spin_lock(&xprt->sc_rq_dto_lock); |
| list_add_tail(&read_hdr->list, |
| &xprt->sc_read_complete_q); |
| spin_unlock(&xprt->sc_rq_dto_lock); |
| |
| set_bit(XPT_DATA, &xprt->sc_xprt.xpt_flags); |
| svc_xprt_enqueue(&xprt->sc_xprt); |
| } |
| |
| svc_rdma_put_context(ctxt, 0); |
| svc_xprt_put(&xprt->sc_xprt); |
| } |
| |
| /** |
| * svc_rdma_wc_inv - Invoked by RDMA provider for each polled LOCAL_INV WC |
| * @cq: completion queue |
| * @wc: completed WR |
| * |
| */ |
| void svc_rdma_wc_inv(struct ib_cq *cq, struct ib_wc *wc) |
| { |
| svc_rdma_send_wc_common_put(cq, wc, "localInv"); |
| } |
| |
| static struct svcxprt_rdma *rdma_create_xprt(struct svc_serv *serv, |
| int listener) |
| { |
| struct svcxprt_rdma *cma_xprt = kzalloc(sizeof *cma_xprt, GFP_KERNEL); |
| |
| if (!cma_xprt) |
| return NULL; |
| svc_xprt_init(&init_net, &svc_rdma_class, &cma_xprt->sc_xprt, serv); |
| INIT_LIST_HEAD(&cma_xprt->sc_accept_q); |
| INIT_LIST_HEAD(&cma_xprt->sc_rq_dto_q); |
| INIT_LIST_HEAD(&cma_xprt->sc_read_complete_q); |
| INIT_LIST_HEAD(&cma_xprt->sc_frmr_q); |
| INIT_LIST_HEAD(&cma_xprt->sc_ctxts); |
| INIT_LIST_HEAD(&cma_xprt->sc_rw_ctxts); |
| init_waitqueue_head(&cma_xprt->sc_send_wait); |
| |
| spin_lock_init(&cma_xprt->sc_lock); |
| spin_lock_init(&cma_xprt->sc_rq_dto_lock); |
| spin_lock_init(&cma_xprt->sc_frmr_q_lock); |
| spin_lock_init(&cma_xprt->sc_ctxt_lock); |
| spin_lock_init(&cma_xprt->sc_rw_ctxt_lock); |
| |
| /* |
| * Note that this implies that the underlying transport support |
| * has some form of congestion control (see RFC 7530 section 3.1 |
| * paragraph 2). For now, we assume that all supported RDMA |
| * transports are suitable here. |
| */ |
| set_bit(XPT_CONG_CTRL, &cma_xprt->sc_xprt.xpt_flags); |
| |
| if (listener) |
| set_bit(XPT_LISTENER, &cma_xprt->sc_xprt.xpt_flags); |
| |
| return cma_xprt; |
| } |
| |
| int svc_rdma_post_recv(struct svcxprt_rdma *xprt, gfp_t flags) |
| { |
| struct ib_recv_wr recv_wr, *bad_recv_wr; |
| struct svc_rdma_op_ctxt *ctxt; |
| struct page *page; |
| dma_addr_t pa; |
| int sge_no; |
| int buflen; |
| int ret; |
| |
| ctxt = svc_rdma_get_context(xprt); |
| buflen = 0; |
| ctxt->direction = DMA_FROM_DEVICE; |
| ctxt->cqe.done = svc_rdma_wc_receive; |
| for (sge_no = 0; buflen < xprt->sc_max_req_size; sge_no++) { |
| if (sge_no >= xprt->sc_max_sge) { |
| pr_err("svcrdma: Too many sges (%d)\n", sge_no); |
| goto err_put_ctxt; |
| } |
| page = alloc_page(flags); |
| if (!page) |
| goto err_put_ctxt; |
| ctxt->pages[sge_no] = page; |
| pa = ib_dma_map_page(xprt->sc_cm_id->device, |
| page, 0, PAGE_SIZE, |
| DMA_FROM_DEVICE); |
| if (ib_dma_mapping_error(xprt->sc_cm_id->device, pa)) |
| goto err_put_ctxt; |
| svc_rdma_count_mappings(xprt, ctxt); |
| ctxt->sge[sge_no].addr = pa; |
| ctxt->sge[sge_no].length = PAGE_SIZE; |
| ctxt->sge[sge_no].lkey = xprt->sc_pd->local_dma_lkey; |
| ctxt->count = sge_no + 1; |
| buflen += PAGE_SIZE; |
| } |
| recv_wr.next = NULL; |
| recv_wr.sg_list = &ctxt->sge[0]; |
| recv_wr.num_sge = ctxt->count; |
| recv_wr.wr_cqe = &ctxt->cqe; |
| |
| svc_xprt_get(&xprt->sc_xprt); |
| ret = ib_post_recv(xprt->sc_qp, &recv_wr, &bad_recv_wr); |
| if (ret) { |
| svc_rdma_unmap_dma(ctxt); |
| svc_rdma_put_context(ctxt, 1); |
| svc_xprt_put(&xprt->sc_xprt); |
| } |
| return ret; |
| |
| err_put_ctxt: |
| svc_rdma_unmap_dma(ctxt); |
| svc_rdma_put_context(ctxt, 1); |
| return -ENOMEM; |
| } |
| |
| int svc_rdma_repost_recv(struct svcxprt_rdma *xprt, gfp_t flags) |
| { |
| int ret = 0; |
| |
| ret = svc_rdma_post_recv(xprt, flags); |
| if (ret) { |
| pr_err("svcrdma: could not post a receive buffer, err=%d.\n", |
| ret); |
| pr_err("svcrdma: closing transport %p.\n", xprt); |
| set_bit(XPT_CLOSE, &xprt->sc_xprt.xpt_flags); |
| ret = -ENOTCONN; |
| } |
| return ret; |
| } |
| |
| static void |
| svc_rdma_parse_connect_private(struct svcxprt_rdma *newxprt, |
| struct rdma_conn_param *param) |
| { |
| const struct rpcrdma_connect_private *pmsg = param->private_data; |
| |
| if (pmsg && |
| pmsg->cp_magic == rpcrdma_cmp_magic && |
| pmsg->cp_version == RPCRDMA_CMP_VERSION) { |
| newxprt->sc_snd_w_inv = pmsg->cp_flags & |
| RPCRDMA_CMP_F_SND_W_INV_OK; |
| |
| dprintk("svcrdma: client send_size %u, recv_size %u " |
| "remote inv %ssupported\n", |
| rpcrdma_decode_buffer_size(pmsg->cp_send_size), |
| rpcrdma_decode_buffer_size(pmsg->cp_recv_size), |
| newxprt->sc_snd_w_inv ? "" : "un"); |
| } |
| } |
| |
| /* |
| * This function handles the CONNECT_REQUEST event on a listening |
| * endpoint. It is passed the cma_id for the _new_ connection. The context in |
| * this cma_id is inherited from the listening cma_id and is the svc_xprt |
| * structure for the listening endpoint. |
| * |
| * This function creates a new xprt for the new connection and enqueues it on |
| * the accept queue for the listent xprt. When the listen thread is kicked, it |
| * will call the recvfrom method on the listen xprt which will accept the new |
| * connection. |
| */ |
| static void handle_connect_req(struct rdma_cm_id *new_cma_id, |
| struct rdma_conn_param *param) |
| { |
| struct svcxprt_rdma *listen_xprt = new_cma_id->context; |
| struct svcxprt_rdma *newxprt; |
| struct sockaddr *sa; |
| |
| /* Create a new transport */ |
| newxprt = rdma_create_xprt(listen_xprt->sc_xprt.xpt_server, 0); |
| if (!newxprt) { |
| dprintk("svcrdma: failed to create new transport\n"); |
| return; |
| } |
| newxprt->sc_cm_id = new_cma_id; |
| new_cma_id->context = newxprt; |
| dprintk("svcrdma: Creating newxprt=%p, cm_id=%p, listenxprt=%p\n", |
| newxprt, newxprt->sc_cm_id, listen_xprt); |
| svc_rdma_parse_connect_private(newxprt, param); |
| |
| /* Save client advertised inbound read limit for use later in accept. */ |
| newxprt->sc_ord = param->initiator_depth; |
| |
| /* Set the local and remote addresses in the transport */ |
| sa = (struct sockaddr *)&newxprt->sc_cm_id->route.addr.dst_addr; |
| svc_xprt_set_remote(&newxprt->sc_xprt, sa, svc_addr_len(sa)); |
| sa = (struct sockaddr *)&newxprt->sc_cm_id->route.addr.src_addr; |
| svc_xprt_set_local(&newxprt->sc_xprt, sa, svc_addr_len(sa)); |
| |
| /* |
| * Enqueue the new transport on the accept queue of the listening |
| * transport |
| */ |
| spin_lock_bh(&listen_xprt->sc_lock); |
| list_add_tail(&newxprt->sc_accept_q, &listen_xprt->sc_accept_q); |
| spin_unlock_bh(&listen_xprt->sc_lock); |
| |
| set_bit(XPT_CONN, &listen_xprt->sc_xprt.xpt_flags); |
| svc_xprt_enqueue(&listen_xprt->sc_xprt); |
| } |
| |
| /* |
| * Handles events generated on the listening endpoint. These events will be |
| * either be incoming connect requests or adapter removal events. |
| */ |
| static int rdma_listen_handler(struct rdma_cm_id *cma_id, |
| struct rdma_cm_event *event) |
| { |
| struct svcxprt_rdma *xprt = cma_id->context; |
| int ret = 0; |
| |
| switch (event->event) { |
| case RDMA_CM_EVENT_CONNECT_REQUEST: |
| dprintk("svcrdma: Connect request on cma_id=%p, xprt = %p, " |
| "event = %s (%d)\n", cma_id, cma_id->context, |
| rdma_event_msg(event->event), event->event); |
| handle_connect_req(cma_id, &event->param.conn); |
| break; |
| |
| case RDMA_CM_EVENT_ESTABLISHED: |
| /* Accept complete */ |
| dprintk("svcrdma: Connection completed on LISTEN xprt=%p, " |
| "cm_id=%p\n", xprt, cma_id); |
| break; |
| |
| case RDMA_CM_EVENT_DEVICE_REMOVAL: |
| dprintk("svcrdma: Device removal xprt=%p, cm_id=%p\n", |
| xprt, cma_id); |
| if (xprt) |
| set_bit(XPT_CLOSE, &xprt->sc_xprt.xpt_flags); |
| break; |
| |
| default: |
| dprintk("svcrdma: Unexpected event on listening endpoint %p, " |
| "event = %s (%d)\n", cma_id, |
| rdma_event_msg(event->event), event->event); |
| break; |
| } |
| |
| return ret; |
| } |
| |
| static int rdma_cma_handler(struct rdma_cm_id *cma_id, |
| struct rdma_cm_event *event) |
| { |
| struct svc_xprt *xprt = cma_id->context; |
| struct svcxprt_rdma *rdma = |
| container_of(xprt, struct svcxprt_rdma, sc_xprt); |
| switch (event->event) { |
| case RDMA_CM_EVENT_ESTABLISHED: |
| /* Accept complete */ |
| svc_xprt_get(xprt); |
| dprintk("svcrdma: Connection completed on DTO xprt=%p, " |
| "cm_id=%p\n", xprt, cma_id); |
| clear_bit(RDMAXPRT_CONN_PENDING, &rdma->sc_flags); |
| svc_xprt_enqueue(xprt); |
| break; |
| case RDMA_CM_EVENT_DISCONNECTED: |
| dprintk("svcrdma: Disconnect on DTO xprt=%p, cm_id=%p\n", |
| xprt, cma_id); |
| if (xprt) { |
| set_bit(XPT_CLOSE, &xprt->xpt_flags); |
| svc_xprt_enqueue(xprt); |
| svc_xprt_put(xprt); |
| } |
| break; |
| case RDMA_CM_EVENT_DEVICE_REMOVAL: |
| dprintk("svcrdma: Device removal cma_id=%p, xprt = %p, " |
| "event = %s (%d)\n", cma_id, xprt, |
| rdma_event_msg(event->event), event->event); |
| if (xprt) { |
| set_bit(XPT_CLOSE, &xprt->xpt_flags); |
| svc_xprt_enqueue(xprt); |
| svc_xprt_put(xprt); |
| } |
| break; |
| default: |
| dprintk("svcrdma: Unexpected event on DTO endpoint %p, " |
| "event = %s (%d)\n", cma_id, |
| rdma_event_msg(event->event), event->event); |
| break; |
| } |
| return 0; |
| } |
| |
| /* |
| * Create a listening RDMA service endpoint. |
| */ |
| static struct svc_xprt *svc_rdma_create(struct svc_serv *serv, |
| struct net *net, |
| struct sockaddr *sa, int salen, |
| int flags) |
| { |
| struct rdma_cm_id *listen_id; |
| struct svcxprt_rdma *cma_xprt; |
| int ret; |
| |
| dprintk("svcrdma: Creating RDMA socket\n"); |
| if ((sa->sa_family != AF_INET) && (sa->sa_family != AF_INET6)) { |
| dprintk("svcrdma: Address family %d is not supported.\n", sa->sa_family); |
| return ERR_PTR(-EAFNOSUPPORT); |
| } |
| cma_xprt = rdma_create_xprt(serv, 1); |
| if (!cma_xprt) |
| return ERR_PTR(-ENOMEM); |
| |
| listen_id = rdma_create_id(&init_net, rdma_listen_handler, cma_xprt, |
| RDMA_PS_TCP, IB_QPT_RC); |
| if (IS_ERR(listen_id)) { |
| ret = PTR_ERR(listen_id); |
| dprintk("svcrdma: rdma_create_id failed = %d\n", ret); |
| goto err0; |
| } |
| |
| /* Allow both IPv4 and IPv6 sockets to bind a single port |
| * at the same time. |
| */ |
| #if IS_ENABLED(CONFIG_IPV6) |
| ret = rdma_set_afonly(listen_id, 1); |
| if (ret) { |
| dprintk("svcrdma: rdma_set_afonly failed = %d\n", ret); |
| goto err1; |
| } |
| #endif |
| ret = rdma_bind_addr(listen_id, sa); |
| if (ret) { |
| dprintk("svcrdma: rdma_bind_addr failed = %d\n", ret); |
| goto err1; |
| } |
| cma_xprt->sc_cm_id = listen_id; |
| |
| ret = rdma_listen(listen_id, RPCRDMA_LISTEN_BACKLOG); |
| if (ret) { |
| dprintk("svcrdma: rdma_listen failed = %d\n", ret); |
| goto err1; |
| } |
| |
| /* |
| * We need to use the address from the cm_id in case the |
| * caller specified 0 for the port number. |
| */ |
| sa = (struct sockaddr *)&cma_xprt->sc_cm_id->route.addr.src_addr; |
| svc_xprt_set_local(&cma_xprt->sc_xprt, sa, salen); |
| |
| return &cma_xprt->sc_xprt; |
| |
| err1: |
| rdma_destroy_id(listen_id); |
| err0: |
| kfree(cma_xprt); |
| return ERR_PTR(ret); |
| } |
| |
| static struct svc_rdma_fastreg_mr *rdma_alloc_frmr(struct svcxprt_rdma *xprt) |
| { |
| struct ib_mr *mr; |
| struct scatterlist *sg; |
| struct svc_rdma_fastreg_mr *frmr; |
| u32 num_sg; |
| |
| frmr = kmalloc(sizeof(*frmr), GFP_KERNEL); |
| if (!frmr) |
| goto err; |
| |
| num_sg = min_t(u32, RPCSVC_MAXPAGES, xprt->sc_frmr_pg_list_len); |
| mr = ib_alloc_mr(xprt->sc_pd, IB_MR_TYPE_MEM_REG, num_sg); |
| if (IS_ERR(mr)) |
| goto err_free_frmr; |
| |
| sg = kcalloc(RPCSVC_MAXPAGES, sizeof(*sg), GFP_KERNEL); |
| if (!sg) |
| goto err_free_mr; |
| |
| sg_init_table(sg, RPCSVC_MAXPAGES); |
| |
| frmr->mr = mr; |
| frmr->sg = sg; |
| INIT_LIST_HEAD(&frmr->frmr_list); |
| return frmr; |
| |
| err_free_mr: |
| ib_dereg_mr(mr); |
| err_free_frmr: |
| kfree(frmr); |
| err: |
| return ERR_PTR(-ENOMEM); |
| } |
| |
| static void rdma_dealloc_frmr_q(struct svcxprt_rdma *xprt) |
| { |
| struct svc_rdma_fastreg_mr *frmr; |
| |
| while (!list_empty(&xprt->sc_frmr_q)) { |
| frmr = list_entry(xprt->sc_frmr_q.next, |
| struct svc_rdma_fastreg_mr, frmr_list); |
| list_del_init(&frmr->frmr_list); |
| kfree(frmr->sg); |
| ib_dereg_mr(frmr->mr); |
| kfree(frmr); |
| } |
| } |
| |
| struct svc_rdma_fastreg_mr *svc_rdma_get_frmr(struct svcxprt_rdma *rdma) |
| { |
| struct svc_rdma_fastreg_mr *frmr = NULL; |
| |
| spin_lock(&rdma->sc_frmr_q_lock); |
| if (!list_empty(&rdma->sc_frmr_q)) { |
| frmr = list_entry(rdma->sc_frmr_q.next, |
| struct svc_rdma_fastreg_mr, frmr_list); |
| list_del_init(&frmr->frmr_list); |
| frmr->sg_nents = 0; |
| } |
| spin_unlock(&rdma->sc_frmr_q_lock); |
| if (frmr) |
| return frmr; |
| |
| return rdma_alloc_frmr(rdma); |
| } |
| |
| void svc_rdma_put_frmr(struct svcxprt_rdma *rdma, |
| struct svc_rdma_fastreg_mr *frmr) |
| { |
| if (frmr) { |
| ib_dma_unmap_sg(rdma->sc_cm_id->device, |
| frmr->sg, frmr->sg_nents, frmr->direction); |
| spin_lock(&rdma->sc_frmr_q_lock); |
| WARN_ON_ONCE(!list_empty(&frmr->frmr_list)); |
| list_add(&frmr->frmr_list, &rdma->sc_frmr_q); |
| spin_unlock(&rdma->sc_frmr_q_lock); |
| } |
| } |
| |
| /* |
| * This is the xpo_recvfrom function for listening endpoints. Its |
| * purpose is to accept incoming connections. The CMA callback handler |
| * has already created a new transport and attached it to the new CMA |
| * ID. |
| * |
| * There is a queue of pending connections hung on the listening |
| * transport. This queue contains the new svc_xprt structure. This |
| * function takes svc_xprt structures off the accept_q and completes |
| * the connection. |
| */ |
| static struct svc_xprt *svc_rdma_accept(struct svc_xprt *xprt) |
| { |
| struct svcxprt_rdma *listen_rdma; |
| struct svcxprt_rdma *newxprt = NULL; |
| struct rdma_conn_param conn_param; |
| struct rpcrdma_connect_private pmsg; |
| struct ib_qp_init_attr qp_attr; |
| struct ib_device *dev; |
| struct sockaddr *sap; |
| unsigned int i; |
| int ret = 0; |
| |
| listen_rdma = container_of(xprt, struct svcxprt_rdma, sc_xprt); |
| clear_bit(XPT_CONN, &xprt->xpt_flags); |
| /* Get the next entry off the accept list */ |
| spin_lock_bh(&listen_rdma->sc_lock); |
| if (!list_empty(&listen_rdma->sc_accept_q)) { |
| newxprt = list_entry(listen_rdma->sc_accept_q.next, |
| struct svcxprt_rdma, sc_accept_q); |
| list_del_init(&newxprt->sc_accept_q); |
| } |
| if (!list_empty(&listen_rdma->sc_accept_q)) |
| set_bit(XPT_CONN, &listen_rdma->sc_xprt.xpt_flags); |
| spin_unlock_bh(&listen_rdma->sc_lock); |
| if (!newxprt) |
| return NULL; |
| |
| dprintk("svcrdma: newxprt from accept queue = %p, cm_id=%p\n", |
| newxprt, newxprt->sc_cm_id); |
| |
| dev = newxprt->sc_cm_id->device; |
| newxprt->sc_port_num = newxprt->sc_cm_id->port_num; |
| |
| /* Qualify the transport resource defaults with the |
| * capabilities of this particular device */ |
| newxprt->sc_max_sge = min((size_t)dev->attrs.max_sge, |
| (size_t)RPCSVC_MAXPAGES); |
| newxprt->sc_max_sge_rd = min_t(size_t, dev->attrs.max_sge_rd, |
| RPCSVC_MAXPAGES); |
| newxprt->sc_max_req_size = svcrdma_max_req_size; |
| newxprt->sc_max_requests = min_t(u32, dev->attrs.max_qp_wr, |
| svcrdma_max_requests); |
| newxprt->sc_fc_credits = cpu_to_be32(newxprt->sc_max_requests); |
| newxprt->sc_max_bc_requests = min_t(u32, dev->attrs.max_qp_wr, |
| svcrdma_max_bc_requests); |
| newxprt->sc_rq_depth = newxprt->sc_max_requests + |
| newxprt->sc_max_bc_requests; |
| newxprt->sc_sq_depth = newxprt->sc_rq_depth; |
| atomic_set(&newxprt->sc_sq_avail, newxprt->sc_sq_depth); |
| |
| if (!svc_rdma_prealloc_ctxts(newxprt)) |
| goto errout; |
| |
| /* |
| * Limit ORD based on client limit, local device limit, and |
| * configured svcrdma limit. |
| */ |
| newxprt->sc_ord = min_t(size_t, dev->attrs.max_qp_rd_atom, newxprt->sc_ord); |
| newxprt->sc_ord = min_t(size_t, svcrdma_ord, newxprt->sc_ord); |
| |
| newxprt->sc_pd = ib_alloc_pd(dev, 0); |
| if (IS_ERR(newxprt->sc_pd)) { |
| dprintk("svcrdma: error creating PD for connect request\n"); |
| goto errout; |
| } |
| newxprt->sc_sq_cq = ib_alloc_cq(dev, newxprt, newxprt->sc_sq_depth, |
| 0, IB_POLL_WORKQUEUE); |
| if (IS_ERR(newxprt->sc_sq_cq)) { |
| dprintk("svcrdma: error creating SQ CQ for connect request\n"); |
| goto errout; |
| } |
| newxprt->sc_rq_cq = ib_alloc_cq(dev, newxprt, newxprt->sc_rq_depth, |
| 0, IB_POLL_WORKQUEUE); |
| if (IS_ERR(newxprt->sc_rq_cq)) { |
| dprintk("svcrdma: error creating RQ CQ for connect request\n"); |
| goto errout; |
| } |
| |
| memset(&qp_attr, 0, sizeof qp_attr); |
| qp_attr.event_handler = qp_event_handler; |
| qp_attr.qp_context = &newxprt->sc_xprt; |
| qp_attr.port_num = newxprt->sc_cm_id->port_num; |
| qp_attr.cap.max_rdma_ctxs = newxprt->sc_max_requests; |
| qp_attr.cap.max_send_wr = newxprt->sc_sq_depth; |
| qp_attr.cap.max_recv_wr = newxprt->sc_rq_depth; |
| qp_attr.cap.max_send_sge = newxprt->sc_max_sge; |
| qp_attr.cap.max_recv_sge = newxprt->sc_max_sge; |
| qp_attr.sq_sig_type = IB_SIGNAL_REQ_WR; |
| qp_attr.qp_type = IB_QPT_RC; |
| qp_attr.send_cq = newxprt->sc_sq_cq; |
| qp_attr.recv_cq = newxprt->sc_rq_cq; |
| dprintk("svcrdma: newxprt->sc_cm_id=%p, newxprt->sc_pd=%p\n", |
| newxprt->sc_cm_id, newxprt->sc_pd); |
| dprintk(" cap.max_send_wr = %d, cap.max_recv_wr = %d\n", |
| qp_attr.cap.max_send_wr, qp_attr.cap.max_recv_wr); |
| dprintk(" cap.max_send_sge = %d, cap.max_recv_sge = %d\n", |
| qp_attr.cap.max_send_sge, qp_attr.cap.max_recv_sge); |
| |
| ret = rdma_create_qp(newxprt->sc_cm_id, newxprt->sc_pd, &qp_attr); |
| if (ret) { |
| dprintk("svcrdma: failed to create QP, ret=%d\n", ret); |
| goto errout; |
| } |
| newxprt->sc_qp = newxprt->sc_cm_id->qp; |
| |
| /* |
| * Use the most secure set of MR resources based on the |
| * transport type and available memory management features in |
| * the device. Here's the table implemented below: |
| * |
| * Fast Global DMA Remote WR |
| * Reg LKEY MR Access |
| * Sup'd Sup'd Needed Needed |
| * |
| * IWARP N N Y Y |
| * N Y Y Y |
| * Y N Y N |
| * Y Y N - |
| * |
| * IB N N Y N |
| * N Y N - |
| * Y N Y N |
| * Y Y N - |
| * |
| * NB: iWARP requires remote write access for the data sink |
| * of an RDMA_READ. IB does not. |
| */ |
| newxprt->sc_reader = rdma_read_chunk_lcl; |
| if (dev->attrs.device_cap_flags & IB_DEVICE_MEM_MGT_EXTENSIONS) { |
| newxprt->sc_frmr_pg_list_len = |
| dev->attrs.max_fast_reg_page_list_len; |
| newxprt->sc_dev_caps |= SVCRDMA_DEVCAP_FAST_REG; |
| newxprt->sc_reader = rdma_read_chunk_frmr; |
| } else |
| newxprt->sc_snd_w_inv = false; |
| |
| /* |
| * Determine if a DMA MR is required and if so, what privs are required |
| */ |
| if (!rdma_protocol_iwarp(dev, newxprt->sc_cm_id->port_num) && |
| !rdma_ib_or_roce(dev, newxprt->sc_cm_id->port_num)) |
| goto errout; |
| |
| if (rdma_protocol_iwarp(dev, newxprt->sc_cm_id->port_num)) |
| newxprt->sc_dev_caps |= SVCRDMA_DEVCAP_READ_W_INV; |
| |
| /* Post receive buffers */ |
| for (i = 0; i < newxprt->sc_max_requests; i++) { |
| ret = svc_rdma_post_recv(newxprt, GFP_KERNEL); |
| if (ret) { |
| dprintk("svcrdma: failure posting receive buffers\n"); |
| goto errout; |
| } |
| } |
| |
| /* Swap out the handler */ |
| newxprt->sc_cm_id->event_handler = rdma_cma_handler; |
| |
| /* Construct RDMA-CM private message */ |
| pmsg.cp_magic = rpcrdma_cmp_magic; |
| pmsg.cp_version = RPCRDMA_CMP_VERSION; |
| pmsg.cp_flags = 0; |
| pmsg.cp_send_size = pmsg.cp_recv_size = |
| rpcrdma_encode_buffer_size(newxprt->sc_max_req_size); |
| |
| /* Accept Connection */ |
| set_bit(RDMAXPRT_CONN_PENDING, &newxprt->sc_flags); |
| memset(&conn_param, 0, sizeof conn_param); |
| conn_param.responder_resources = 0; |
| conn_param.initiator_depth = newxprt->sc_ord; |
| conn_param.private_data = &pmsg; |
| conn_param.private_data_len = sizeof(pmsg); |
| ret = rdma_accept(newxprt->sc_cm_id, &conn_param); |
| if (ret) { |
| dprintk("svcrdma: failed to accept new connection, ret=%d\n", |
| ret); |
| goto errout; |
| } |
| |
| dprintk("svcrdma: new connection %p accepted:\n", newxprt); |
| sap = (struct sockaddr *)&newxprt->sc_cm_id->route.addr.src_addr; |
| dprintk(" local address : %pIS:%u\n", sap, rpc_get_port(sap)); |
| sap = (struct sockaddr *)&newxprt->sc_cm_id->route.addr.dst_addr; |
| dprintk(" remote address : %pIS:%u\n", sap, rpc_get_port(sap)); |
| dprintk(" max_sge : %d\n", newxprt->sc_max_sge); |
| dprintk(" max_sge_rd : %d\n", newxprt->sc_max_sge_rd); |
| dprintk(" sq_depth : %d\n", newxprt->sc_sq_depth); |
| dprintk(" max_requests : %d\n", newxprt->sc_max_requests); |
| dprintk(" ord : %d\n", newxprt->sc_ord); |
| |
| return &newxprt->sc_xprt; |
| |
| errout: |
| dprintk("svcrdma: failure accepting new connection rc=%d.\n", ret); |
| /* Take a reference in case the DTO handler runs */ |
| svc_xprt_get(&newxprt->sc_xprt); |
| if (newxprt->sc_qp && !IS_ERR(newxprt->sc_qp)) |
| ib_destroy_qp(newxprt->sc_qp); |
| rdma_destroy_id(newxprt->sc_cm_id); |
| /* This call to put will destroy the transport */ |
| svc_xprt_put(&newxprt->sc_xprt); |
| return NULL; |
| } |
| |
| static void svc_rdma_release_rqst(struct svc_rqst *rqstp) |
| { |
| } |
| |
| /* |
| * When connected, an svc_xprt has at least two references: |
| * |
| * - A reference held by the cm_id between the ESTABLISHED and |
| * DISCONNECTED events. If the remote peer disconnected first, this |
| * reference could be gone. |
| * |
| * - A reference held by the svc_recv code that called this function |
| * as part of close processing. |
| * |
| * At a minimum one references should still be held. |
| */ |
| static void svc_rdma_detach(struct svc_xprt *xprt) |
| { |
| struct svcxprt_rdma *rdma = |
| container_of(xprt, struct svcxprt_rdma, sc_xprt); |
| dprintk("svc: svc_rdma_detach(%p)\n", xprt); |
| |
| /* Disconnect and flush posted WQE */ |
| rdma_disconnect(rdma->sc_cm_id); |
| } |
| |
| static void __svc_rdma_free(struct work_struct *work) |
| { |
| struct svcxprt_rdma *rdma = |
| container_of(work, struct svcxprt_rdma, sc_work); |
| struct svc_xprt *xprt = &rdma->sc_xprt; |
| |
| dprintk("svcrdma: %s(%p)\n", __func__, rdma); |
| |
| if (rdma->sc_qp && !IS_ERR(rdma->sc_qp)) |
| ib_drain_qp(rdma->sc_qp); |
| |
| /* We should only be called from kref_put */ |
| if (kref_read(&xprt->xpt_ref) != 0) |
| pr_err("svcrdma: sc_xprt still in use? (%d)\n", |
| kref_read(&xprt->xpt_ref)); |
| |
| /* |
| * Destroy queued, but not processed read completions. Note |
| * that this cleanup has to be done before destroying the |
| * cm_id because the device ptr is needed to unmap the dma in |
| * svc_rdma_put_context. |
| */ |
| while (!list_empty(&rdma->sc_read_complete_q)) { |
| struct svc_rdma_op_ctxt *ctxt; |
| ctxt = list_first_entry(&rdma->sc_read_complete_q, |
| struct svc_rdma_op_ctxt, list); |
| list_del(&ctxt->list); |
| svc_rdma_put_context(ctxt, 1); |
| } |
| |
| /* Destroy queued, but not processed recv completions */ |
| while (!list_empty(&rdma->sc_rq_dto_q)) { |
| struct svc_rdma_op_ctxt *ctxt; |
| ctxt = list_first_entry(&rdma->sc_rq_dto_q, |
| struct svc_rdma_op_ctxt, list); |
| list_del(&ctxt->list); |
| svc_rdma_put_context(ctxt, 1); |
| } |
| |
| /* Warn if we leaked a resource or under-referenced */ |
| if (rdma->sc_ctxt_used != 0) |
| pr_err("svcrdma: ctxt still in use? (%d)\n", |
| rdma->sc_ctxt_used); |
| |
| /* Final put of backchannel client transport */ |
| if (xprt->xpt_bc_xprt) { |
| xprt_put(xprt->xpt_bc_xprt); |
| xprt->xpt_bc_xprt = NULL; |
| } |
| |
| rdma_dealloc_frmr_q(rdma); |
| svc_rdma_destroy_rw_ctxts(rdma); |
| svc_rdma_destroy_ctxts(rdma); |
| |
| /* Destroy the QP if present (not a listener) */ |
| if (rdma->sc_qp && !IS_ERR(rdma->sc_qp)) |
| ib_destroy_qp(rdma->sc_qp); |
| |
| if (rdma->sc_sq_cq && !IS_ERR(rdma->sc_sq_cq)) |
| ib_free_cq(rdma->sc_sq_cq); |
| |
| if (rdma->sc_rq_cq && !IS_ERR(rdma->sc_rq_cq)) |
| ib_free_cq(rdma->sc_rq_cq); |
| |
| if (rdma->sc_pd && !IS_ERR(rdma->sc_pd)) |
| ib_dealloc_pd(rdma->sc_pd); |
| |
| /* Destroy the CM ID */ |
| rdma_destroy_id(rdma->sc_cm_id); |
| |
| kfree(rdma); |
| } |
| |
| static void svc_rdma_free(struct svc_xprt *xprt) |
| { |
| struct svcxprt_rdma *rdma = |
| container_of(xprt, struct svcxprt_rdma, sc_xprt); |
| INIT_WORK(&rdma->sc_work, __svc_rdma_free); |
| queue_work(svc_rdma_wq, &rdma->sc_work); |
| } |
| |
| static int svc_rdma_has_wspace(struct svc_xprt *xprt) |
| { |
| struct svcxprt_rdma *rdma = |
| container_of(xprt, struct svcxprt_rdma, sc_xprt); |
| |
| /* |
| * If there are already waiters on the SQ, |
| * return false. |
| */ |
| if (waitqueue_active(&rdma->sc_send_wait)) |
| return 0; |
| |
| /* Otherwise return true. */ |
| return 1; |
| } |
| |
| static int svc_rdma_secure_port(struct svc_rqst *rqstp) |
| { |
| return 1; |
| } |
| |
| static void svc_rdma_kill_temp_xprt(struct svc_xprt *xprt) |
| { |
| } |
| |
| int svc_rdma_send(struct svcxprt_rdma *xprt, struct ib_send_wr *wr) |
| { |
| struct ib_send_wr *bad_wr, *n_wr; |
| int wr_count; |
| int i; |
| int ret; |
| |
| if (test_bit(XPT_CLOSE, &xprt->sc_xprt.xpt_flags)) |
| return -ENOTCONN; |
| |
| wr_count = 1; |
| for (n_wr = wr->next; n_wr; n_wr = n_wr->next) |
| wr_count++; |
| |
| /* If the SQ is full, wait until an SQ entry is available */ |
| while (1) { |
| if ((atomic_sub_return(wr_count, &xprt->sc_sq_avail) < 0)) { |
| atomic_inc(&rdma_stat_sq_starve); |
| |
| /* Wait until SQ WR available if SQ still full */ |
| atomic_add(wr_count, &xprt->sc_sq_avail); |
| wait_event(xprt->sc_send_wait, |
| atomic_read(&xprt->sc_sq_avail) > wr_count); |
| if (test_bit(XPT_CLOSE, &xprt->sc_xprt.xpt_flags)) |
| return -ENOTCONN; |
| continue; |
| } |
| /* Take a transport ref for each WR posted */ |
| for (i = 0; i < wr_count; i++) |
| svc_xprt_get(&xprt->sc_xprt); |
| |
| /* Bump used SQ WR count and post */ |
| ret = ib_post_send(xprt->sc_qp, wr, &bad_wr); |
| if (ret) { |
| set_bit(XPT_CLOSE, &xprt->sc_xprt.xpt_flags); |
| for (i = 0; i < wr_count; i ++) |
| svc_xprt_put(&xprt->sc_xprt); |
| dprintk("svcrdma: failed to post SQ WR rc=%d\n", ret); |
| dprintk(" sc_sq_avail=%d, sc_sq_depth=%d\n", |
| atomic_read(&xprt->sc_sq_avail), |
| xprt->sc_sq_depth); |
| wake_up(&xprt->sc_send_wait); |
| } |
| break; |
| } |
| return ret; |
| } |