// SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause /* * Copyright (c) 2014-2017 Oracle. All rights reserved. * Copyright (c) 2003-2007 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. */ /* * transport.c * * This file contains the top-level implementation of an RPC RDMA * transport. * * Naming convention: functions beginning with xprt_ are part of the * transport switch. All others are RPC RDMA internal. */ #include #include #include #include #include #include #include "xprt_rdma.h" #include #if IS_ENABLED(CONFIG_SUNRPC_DEBUG) # define RPCDBG_FACILITY RPCDBG_TRANS #endif /* * tunables */ static unsigned int xprt_rdma_slot_table_entries = RPCRDMA_DEF_SLOT_TABLE; unsigned int xprt_rdma_max_inline_read = RPCRDMA_DEF_INLINE; static unsigned int xprt_rdma_max_inline_write = RPCRDMA_DEF_INLINE; unsigned int xprt_rdma_memreg_strategy = RPCRDMA_FRWR; int xprt_rdma_pad_optimize; #if IS_ENABLED(CONFIG_SUNRPC_DEBUG) static unsigned int min_slot_table_size = RPCRDMA_MIN_SLOT_TABLE; static unsigned int max_slot_table_size = RPCRDMA_MAX_SLOT_TABLE; static unsigned int min_inline_size = RPCRDMA_MIN_INLINE; static unsigned int max_inline_size = RPCRDMA_MAX_INLINE; static unsigned int zero; static unsigned int max_padding = PAGE_SIZE; static unsigned int min_memreg = RPCRDMA_BOUNCEBUFFERS; static unsigned int max_memreg = RPCRDMA_LAST - 1; static unsigned int dummy; static struct ctl_table_header *sunrpc_table_header; static struct ctl_table xr_tunables_table[] = { { .procname = "rdma_slot_table_entries", .data = &xprt_rdma_slot_table_entries, .maxlen = sizeof(unsigned int), .mode = 0644, .proc_handler = proc_dointvec_minmax, .extra1 = &min_slot_table_size, .extra2 = &max_slot_table_size }, { .procname = "rdma_max_inline_read", .data = &xprt_rdma_max_inline_read, .maxlen = sizeof(unsigned int), .mode = 0644, .proc_handler = proc_dointvec_minmax, .extra1 = &min_inline_size, .extra2 = &max_inline_size, }, { .procname = "rdma_max_inline_write", .data = &xprt_rdma_max_inline_write, .maxlen = sizeof(unsigned int), .mode = 0644, .proc_handler = proc_dointvec_minmax, .extra1 = &min_inline_size, .extra2 = &max_inline_size, }, { .procname = "rdma_inline_write_padding", .data = &dummy, .maxlen = sizeof(unsigned int), .mode = 0644, .proc_handler = proc_dointvec_minmax, .extra1 = &zero, .extra2 = &max_padding, }, { .procname = "rdma_memreg_strategy", .data = &xprt_rdma_memreg_strategy, .maxlen = sizeof(unsigned int), .mode = 0644, .proc_handler = proc_dointvec_minmax, .extra1 = &min_memreg, .extra2 = &max_memreg, }, { .procname = "rdma_pad_optimize", .data = &xprt_rdma_pad_optimize, .maxlen = sizeof(unsigned int), .mode = 0644, .proc_handler = proc_dointvec, }, { }, }; static struct ctl_table sunrpc_table[] = { { .procname = "sunrpc", .mode = 0555, .child = xr_tunables_table }, { }, }; #endif static const struct rpc_xprt_ops xprt_rdma_procs; static void xprt_rdma_format_addresses4(struct rpc_xprt *xprt, struct sockaddr *sap) { struct sockaddr_in *sin = (struct sockaddr_in *)sap; char buf[20]; snprintf(buf, sizeof(buf), "%08x", ntohl(sin->sin_addr.s_addr)); xprt->address_strings[RPC_DISPLAY_HEX_ADDR] = kstrdup(buf, GFP_KERNEL); xprt->address_strings[RPC_DISPLAY_NETID] = RPCBIND_NETID_RDMA; } static void xprt_rdma_format_addresses6(struct rpc_xprt *xprt, struct sockaddr *sap) { struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap; char buf[40]; snprintf(buf, sizeof(buf), "%pi6", &sin6->sin6_addr); xprt->address_strings[RPC_DISPLAY_HEX_ADDR] = kstrdup(buf, GFP_KERNEL); xprt->address_strings[RPC_DISPLAY_NETID] = RPCBIND_NETID_RDMA6; } void xprt_rdma_format_addresses(struct rpc_xprt *xprt, struct sockaddr *sap) { char buf[128]; switch (sap->sa_family) { case AF_INET: xprt_rdma_format_addresses4(xprt, sap); break; case AF_INET6: xprt_rdma_format_addresses6(xprt, sap); break; default: pr_err("rpcrdma: Unrecognized address family\n"); return; } (void)rpc_ntop(sap, buf, sizeof(buf)); xprt->address_strings[RPC_DISPLAY_ADDR] = kstrdup(buf, GFP_KERNEL); snprintf(buf, sizeof(buf), "%u", rpc_get_port(sap)); xprt->address_strings[RPC_DISPLAY_PORT] = kstrdup(buf, GFP_KERNEL); snprintf(buf, sizeof(buf), "%4hx", rpc_get_port(sap)); xprt->address_strings[RPC_DISPLAY_HEX_PORT] = kstrdup(buf, GFP_KERNEL); xprt->address_strings[RPC_DISPLAY_PROTO] = "rdma"; } void xprt_rdma_free_addresses(struct rpc_xprt *xprt) { unsigned int i; for (i = 0; i < RPC_DISPLAY_MAX; i++) switch (i) { case RPC_DISPLAY_PROTO: case RPC_DISPLAY_NETID: continue; default: kfree(xprt->address_strings[i]); } } void rpcrdma_conn_func(struct rpcrdma_ep *ep) { schedule_delayed_work(&ep->rep_connect_worker, 0); } void rpcrdma_connect_worker(struct work_struct *work) { struct rpcrdma_ep *ep = container_of(work, struct rpcrdma_ep, rep_connect_worker.work); struct rpcrdma_xprt *r_xprt = container_of(ep, struct rpcrdma_xprt, rx_ep); struct rpc_xprt *xprt = &r_xprt->rx_xprt; spin_lock_bh(&xprt->transport_lock); if (ep->rep_connected > 0) { if (!xprt_test_and_set_connected(xprt)) xprt_wake_pending_tasks(xprt, 0); } else { if (xprt_test_and_clear_connected(xprt)) xprt_wake_pending_tasks(xprt, -ENOTCONN); } spin_unlock_bh(&xprt->transport_lock); } static void xprt_rdma_connect_worker(struct work_struct *work) { struct rpcrdma_xprt *r_xprt = container_of(work, struct rpcrdma_xprt, rx_connect_worker.work); struct rpc_xprt *xprt = &r_xprt->rx_xprt; int rc = 0; xprt_clear_connected(xprt); rc = rpcrdma_ep_connect(&r_xprt->rx_ep, &r_xprt->rx_ia); if (rc) xprt_wake_pending_tasks(xprt, rc); xprt_clear_connecting(xprt); } static void xprt_rdma_inject_disconnect(struct rpc_xprt *xprt) { struct rpcrdma_xprt *r_xprt = container_of(xprt, struct rpcrdma_xprt, rx_xprt); trace_xprtrdma_inject_dsc(r_xprt); rdma_disconnect(r_xprt->rx_ia.ri_id); } /* * xprt_rdma_destroy * * Destroy the xprt. * Free all memory associated with the object, including its own. * NOTE: none of the *destroy methods free memory for their top-level * objects, even though they may have allocated it (they do free * private memory). It's up to the caller to handle it. In this * case (RDMA transport), all structure memory is inlined with the * struct rpcrdma_xprt. */ static void xprt_rdma_destroy(struct rpc_xprt *xprt) { struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(xprt); trace_xprtrdma_destroy(r_xprt); cancel_delayed_work_sync(&r_xprt->rx_connect_worker); xprt_clear_connected(xprt); rpcrdma_ep_destroy(&r_xprt->rx_ep, &r_xprt->rx_ia); rpcrdma_buffer_destroy(&r_xprt->rx_buf); rpcrdma_ia_close(&r_xprt->rx_ia); xprt_rdma_free_addresses(xprt); xprt_free(xprt); module_put(THIS_MODULE); } static const struct rpc_timeout xprt_rdma_default_timeout = { .to_initval = 60 * HZ, .to_maxval = 60 * HZ, }; /** * xprt_setup_rdma - Set up transport to use RDMA * * @args: rpc transport arguments */ static struct rpc_xprt * xprt_setup_rdma(struct xprt_create *args) { struct rpcrdma_create_data_internal cdata; struct rpc_xprt *xprt; struct rpcrdma_xprt *new_xprt; struct rpcrdma_ep *new_ep; struct sockaddr *sap; int rc; if (args->addrlen > sizeof(xprt->addr)) { dprintk("RPC: %s: address too large\n", __func__); return ERR_PTR(-EBADF); } xprt = xprt_alloc(args->net, sizeof(struct rpcrdma_xprt), 0, 0); if (xprt == NULL) { dprintk("RPC: %s: couldn't allocate rpcrdma_xprt\n", __func__); return ERR_PTR(-ENOMEM); } /* 60 second timeout, no retries */ xprt->timeout = &xprt_rdma_default_timeout; xprt->bind_timeout = RPCRDMA_BIND_TO; xprt->reestablish_timeout = RPCRDMA_INIT_REEST_TO; xprt->idle_timeout = RPCRDMA_IDLE_DISC_TO; xprt->resvport = 0; /* privileged port not needed */ xprt->tsh_size = 0; /* RPC-RDMA handles framing */ xprt->ops = &xprt_rdma_procs; /* * Set up RDMA-specific connect data. */ sap = args->dstaddr; /* Ensure xprt->addr holds valid server TCP (not RDMA) * address, for any side protocols which peek at it */ xprt->prot = IPPROTO_TCP; xprt->addrlen = args->addrlen; memcpy(&xprt->addr, sap, xprt->addrlen); if (rpc_get_port(sap)) xprt_set_bound(xprt); xprt_rdma_format_addresses(xprt, sap); cdata.max_requests = xprt_rdma_slot_table_entries; cdata.rsize = RPCRDMA_MAX_SEGS * PAGE_SIZE; /* RDMA write max */ cdata.wsize = RPCRDMA_MAX_SEGS * PAGE_SIZE; /* RDMA read max */ cdata.inline_wsize = xprt_rdma_max_inline_write; if (cdata.inline_wsize > cdata.wsize) cdata.inline_wsize = cdata.wsize; cdata.inline_rsize = xprt_rdma_max_inline_read; if (cdata.inline_rsize > cdata.rsize) cdata.inline_rsize = cdata.rsize; /* * Create new transport instance, which includes initialized * o ia * o endpoint * o buffers */ new_xprt = rpcx_to_rdmax(xprt); rc = rpcrdma_ia_open(new_xprt); if (rc) goto out1; /* * initialize and create ep */ new_xprt->rx_data = cdata; new_ep = &new_xprt->rx_ep; rc = rpcrdma_ep_create(&new_xprt->rx_ep, &new_xprt->rx_ia, &new_xprt->rx_data); if (rc) goto out2; rc = rpcrdma_buffer_create(new_xprt); if (rc) goto out3; INIT_DELAYED_WORK(&new_xprt->rx_connect_worker, xprt_rdma_connect_worker); xprt->max_payload = new_xprt->rx_ia.ri_ops->ro_maxpages(new_xprt); if (xprt->max_payload == 0) goto out4; xprt->max_payload <<= PAGE_SHIFT; dprintk("RPC: %s: transport data payload maximum: %zu bytes\n", __func__, xprt->max_payload); if (!try_module_get(THIS_MODULE)) goto out4; dprintk("RPC: %s: %s:%s\n", __func__, xprt->address_strings[RPC_DISPLAY_ADDR], xprt->address_strings[RPC_DISPLAY_PORT]); trace_xprtrdma_create(new_xprt); return xprt; out4: rpcrdma_buffer_destroy(&new_xprt->rx_buf); rc = -ENODEV; out3: rpcrdma_ep_destroy(new_ep, &new_xprt->rx_ia); out2: rpcrdma_ia_close(&new_xprt->rx_ia); out1: trace_xprtrdma_destroy(new_xprt); xprt_rdma_free_addresses(xprt); xprt_free(xprt); return ERR_PTR(rc); } /** * xprt_rdma_close - Close down RDMA connection * @xprt: generic transport to be closed * * Called during transport shutdown reconnect, or device * removal. Caller holds the transport's write lock. */ static void xprt_rdma_close(struct rpc_xprt *xprt) { struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(xprt); struct rpcrdma_ep *ep = &r_xprt->rx_ep; struct rpcrdma_ia *ia = &r_xprt->rx_ia; dprintk("RPC: %s: closing xprt %p\n", __func__, xprt); if (test_and_clear_bit(RPCRDMA_IAF_REMOVING, &ia->ri_flags)) { xprt_clear_connected(xprt); rpcrdma_ia_remove(ia); return; } if (ep->rep_connected == -ENODEV) return; if (ep->rep_connected > 0) xprt->reestablish_timeout = 0; xprt_disconnect_done(xprt); rpcrdma_ep_disconnect(ep, ia); /* Prepare @xprt for the next connection by reinitializing * its credit grant to one (see RFC 8166, Section 3.3.3). */ r_xprt->rx_buf.rb_credits = 1; xprt->cwnd = RPC_CWNDSHIFT; } /** * xprt_rdma_set_port - update server port with rpcbind result * @xprt: controlling RPC transport * @port: new port value * * Transport connect status is unchanged. */ static void xprt_rdma_set_port(struct rpc_xprt *xprt, u16 port) { struct sockaddr *sap = (struct sockaddr *)&xprt->addr; char buf[8]; dprintk("RPC: %s: setting port for xprt %p (%s:%s) to %u\n", __func__, xprt, xprt->address_strings[RPC_DISPLAY_ADDR], xprt->address_strings[RPC_DISPLAY_PORT], port); rpc_set_port(sap, port); kfree(xprt->address_strings[RPC_DISPLAY_PORT]); snprintf(buf, sizeof(buf), "%u", port); xprt->address_strings[RPC_DISPLAY_PORT] = kstrdup(buf, GFP_KERNEL); kfree(xprt->address_strings[RPC_DISPLAY_HEX_PORT]); snprintf(buf, sizeof(buf), "%4hx", port); xprt->address_strings[RPC_DISPLAY_HEX_PORT] = kstrdup(buf, GFP_KERNEL); } /** * xprt_rdma_timer - invoked when an RPC times out * @xprt: controlling RPC transport * @task: RPC task that timed out * * Invoked when the transport is still connected, but an RPC * retransmit timeout occurs. * * Since RDMA connections don't have a keep-alive, forcibly * disconnect and retry to connect. This drives full * detection of the network path, and retransmissions of * all pending RPCs. */ static void xprt_rdma_timer(struct rpc_xprt *xprt, struct rpc_task *task) { xprt_force_disconnect(xprt); } static void xprt_rdma_connect(struct rpc_xprt *xprt, struct rpc_task *task) { struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(xprt); if (r_xprt->rx_ep.rep_connected != 0) { /* Reconnect */ schedule_delayed_work(&r_xprt->rx_connect_worker, xprt->reestablish_timeout); xprt->reestablish_timeout <<= 1; if (xprt->reestablish_timeout > RPCRDMA_MAX_REEST_TO) xprt->reestablish_timeout = RPCRDMA_MAX_REEST_TO; else if (xprt->reestablish_timeout < RPCRDMA_INIT_REEST_TO) xprt->reestablish_timeout = RPCRDMA_INIT_REEST_TO; } else { schedule_delayed_work(&r_xprt->rx_connect_worker, 0); if (!RPC_IS_ASYNC(task)) flush_delayed_work(&r_xprt->rx_connect_worker); } } /** * xprt_rdma_alloc_slot - allocate an rpc_rqst * @xprt: controlling RPC transport * @task: RPC task requesting a fresh rpc_rqst * * tk_status values: * %0 if task->tk_rqstp points to a fresh rpc_rqst * %-EAGAIN if no rpc_rqst is available; queued on backlog */ static void xprt_rdma_alloc_slot(struct rpc_xprt *xprt, struct rpc_task *task) { struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(xprt); struct rpcrdma_req *req; req = rpcrdma_buffer_get(&r_xprt->rx_buf); if (!req) goto out_sleep; task->tk_rqstp = &req->rl_slot; task->tk_status = 0; return; out_sleep: rpc_sleep_on(&xprt->backlog, task, NULL); task->tk_status = -EAGAIN; } /** * xprt_rdma_free_slot - release an rpc_rqst * @xprt: controlling RPC transport * @rqst: rpc_rqst to release * */ static void xprt_rdma_free_slot(struct rpc_xprt *xprt, struct rpc_rqst *rqst) { memset(rqst, 0, sizeof(*rqst)); rpcrdma_buffer_put(rpcr_to_rdmar(rqst)); rpc_wake_up_next(&xprt->backlog); } static bool rpcrdma_get_sendbuf(struct rpcrdma_xprt *r_xprt, struct rpcrdma_req *req, size_t size, gfp_t flags) { struct rpcrdma_regbuf *rb; if (req->rl_sendbuf && rdmab_length(req->rl_sendbuf) >= size) return true; rb = rpcrdma_alloc_regbuf(size, DMA_TO_DEVICE, flags); if (IS_ERR(rb)) return false; rpcrdma_free_regbuf(req->rl_sendbuf); r_xprt->rx_stats.hardway_register_count += size; req->rl_sendbuf = rb; return true; } /* The rq_rcv_buf is used only if a Reply chunk is necessary. * The decision to use a Reply chunk is made later in * rpcrdma_marshal_req. This buffer is registered at that time. * * Otherwise, the associated RPC Reply arrives in a separate * Receive buffer, arbitrarily chosen by the HCA. The buffer * allocated here for the RPC Reply is not utilized in that * case. See rpcrdma_inline_fixup. * * A regbuf is used here to remember the buffer size. */ static bool rpcrdma_get_recvbuf(struct rpcrdma_xprt *r_xprt, struct rpcrdma_req *req, size_t size, gfp_t flags) { struct rpcrdma_regbuf *rb; if (req->rl_recvbuf && rdmab_length(req->rl_recvbuf) >= size) return true; rb = rpcrdma_alloc_regbuf(size, DMA_NONE, flags); if (IS_ERR(rb)) return false; rpcrdma_free_regbuf(req->rl_recvbuf); r_xprt->rx_stats.hardway_register_count += size; req->rl_recvbuf = rb; return true; } /** * xprt_rdma_allocate - allocate transport resources for an RPC * @task: RPC task * * Return values: * 0: Success; rq_buffer points to RPC buffer to use * ENOMEM: Out of memory, call again later * EIO: A permanent error occurred, do not retry * * The RDMA allocate/free functions need the task structure as a place * to hide the struct rpcrdma_req, which is necessary for the actual * send/recv sequence. * * xprt_rdma_allocate provides buffers that are already mapped for * DMA, and a local DMA lkey is provided for each. */ static int xprt_rdma_allocate(struct rpc_task *task) { struct rpc_rqst *rqst = task->tk_rqstp; struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(rqst->rq_xprt); struct rpcrdma_req *req = rpcr_to_rdmar(rqst); gfp_t flags; flags = RPCRDMA_DEF_GFP; if (RPC_IS_SWAPPER(task)) flags = __GFP_MEMALLOC | GFP_NOWAIT | __GFP_NOWARN; if (!rpcrdma_get_sendbuf(r_xprt, req, rqst->rq_callsize, flags)) goto out_fail; if (!rpcrdma_get_recvbuf(r_xprt, req, rqst->rq_rcvsize, flags)) goto out_fail; rqst->rq_buffer = req->rl_sendbuf->rg_base; rqst->rq_rbuffer = req->rl_recvbuf->rg_base; trace_xprtrdma_allocate(task, req); return 0; out_fail: trace_xprtrdma_allocate(task, NULL); return -ENOMEM; } /** * xprt_rdma_free - release resources allocated by xprt_rdma_allocate * @task: RPC task * * Caller guarantees rqst->rq_buffer is non-NULL. */ static void xprt_rdma_free(struct rpc_task *task) { struct rpc_rqst *rqst = task->tk_rqstp; struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(rqst->rq_xprt); struct rpcrdma_req *req = rpcr_to_rdmar(rqst); if (test_bit(RPCRDMA_REQ_F_PENDING, &req->rl_flags)) rpcrdma_release_rqst(r_xprt, req); trace_xprtrdma_rpc_done(task, req); } /** * xprt_rdma_send_request - marshal and send an RPC request * @task: RPC task with an RPC message in rq_snd_buf * * Caller holds the transport's write lock. * * Returns: * %0 if the RPC message has been sent * %-ENOTCONN if the caller should reconnect and call again * %-EAGAIN if the caller should call again * %-ENOBUFS if the caller should call again after a delay * %-EIO if a permanent error occurred and the request was not * sent. Do not try to send this message again. */ static int xprt_rdma_send_request(struct rpc_task *task) { struct rpc_rqst *rqst = task->tk_rqstp; struct rpc_xprt *xprt = rqst->rq_xprt; struct rpcrdma_req *req = rpcr_to_rdmar(rqst); struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(xprt); int rc = 0; #if defined(CONFIG_SUNRPC_BACKCHANNEL) if (unlikely(!rqst->rq_buffer)) return xprt_rdma_bc_send_reply(rqst); #endif /* CONFIG_SUNRPC_BACKCHANNEL */ if (!xprt_connected(xprt)) goto drop_connection; rc = rpcrdma_marshal_req(r_xprt, rqst); if (rc < 0) goto failed_marshal; /* Must suppress retransmit to maintain credits */ if (rqst->rq_connect_cookie == xprt->connect_cookie) goto drop_connection; rqst->rq_xtime = ktime_get(); __set_bit(RPCRDMA_REQ_F_PENDING, &req->rl_flags); if (rpcrdma_ep_post(&r_xprt->rx_ia, &r_xprt->rx_ep, req)) goto drop_connection; rqst->rq_xmit_bytes_sent += rqst->rq_snd_buf.len; rqst->rq_bytes_sent = 0; /* An RPC with no reply will throw off credit accounting, * so drop the connection to reset the credit grant. */ if (!rpc_reply_expected(task)) goto drop_connection; return 0; failed_marshal: if (rc != -ENOTCONN) return rc; drop_connection: xprt_disconnect_done(xprt); return -ENOTCONN; /* implies disconnect */ } void xprt_rdma_print_stats(struct rpc_xprt *xprt, struct seq_file *seq) { struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(xprt); long idle_time = 0; if (xprt_connected(xprt)) idle_time = (long)(jiffies - xprt->last_used) / HZ; seq_puts(seq, "\txprt:\trdma "); seq_printf(seq, "%u %lu %lu %lu %ld %lu %lu %lu %llu %llu ", 0, /* need a local port? */ xprt->stat.bind_count, xprt->stat.connect_count, xprt->stat.connect_time, idle_time, xprt->stat.sends, xprt->stat.recvs, xprt->stat.bad_xids, xprt->stat.req_u, xprt->stat.bklog_u); seq_printf(seq, "%lu %lu %lu %llu %llu %llu %llu %lu %lu %lu %lu ", r_xprt->rx_stats.read_chunk_count, r_xprt->rx_stats.write_chunk_count, r_xprt->rx_stats.reply_chunk_count, r_xprt->rx_stats.total_rdma_request, r_xprt->rx_stats.total_rdma_reply, r_xprt->rx_stats.pullup_copy_count, r_xprt->rx_stats.fixup_copy_count, r_xprt->rx_stats.hardway_register_count, r_xprt->rx_stats.failed_marshal_count, r_xprt->rx_stats.bad_reply_count, r_xprt->rx_stats.nomsg_call_count); seq_printf(seq, "%lu %lu %lu %lu %lu %lu\n", r_xprt->rx_stats.mrs_recovered, r_xprt->rx_stats.mrs_orphaned, r_xprt->rx_stats.mrs_allocated, r_xprt->rx_stats.local_inv_needed, r_xprt->rx_stats.empty_sendctx_q, r_xprt->rx_stats.reply_waits_for_send); } static int xprt_rdma_enable_swap(struct rpc_xprt *xprt) { return 0; } static void xprt_rdma_disable_swap(struct rpc_xprt *xprt) { } /* * Plumbing for rpc transport switch and kernel module */ static const struct rpc_xprt_ops xprt_rdma_procs = { .reserve_xprt = xprt_reserve_xprt_cong, .release_xprt = xprt_release_xprt_cong, /* sunrpc/xprt.c */ .alloc_slot = xprt_rdma_alloc_slot, .free_slot = xprt_rdma_free_slot, .release_request = xprt_release_rqst_cong, /* ditto */ .set_retrans_timeout = xprt_set_retrans_timeout_def, /* ditto */ .timer = xprt_rdma_timer, .rpcbind = rpcb_getport_async, /* sunrpc/rpcb_clnt.c */ .set_port = xprt_rdma_set_port, .connect = xprt_rdma_connect, .buf_alloc = xprt_rdma_allocate, .buf_free = xprt_rdma_free, .send_request = xprt_rdma_send_request, .close = xprt_rdma_close, .destroy = xprt_rdma_destroy, .print_stats = xprt_rdma_print_stats, .enable_swap = xprt_rdma_enable_swap, .disable_swap = xprt_rdma_disable_swap, .inject_disconnect = xprt_rdma_inject_disconnect, #if defined(CONFIG_SUNRPC_BACKCHANNEL) .bc_setup = xprt_rdma_bc_setup, .bc_up = xprt_rdma_bc_up, .bc_maxpayload = xprt_rdma_bc_maxpayload, .bc_free_rqst = xprt_rdma_bc_free_rqst, .bc_destroy = xprt_rdma_bc_destroy, #endif }; static struct xprt_class xprt_rdma = { .list = LIST_HEAD_INIT(xprt_rdma.list), .name = "rdma", .owner = THIS_MODULE, .ident = XPRT_TRANSPORT_RDMA, .setup = xprt_setup_rdma, }; void xprt_rdma_cleanup(void) { int rc; dprintk("RPCRDMA Module Removed, deregister RPC RDMA transport\n"); #if IS_ENABLED(CONFIG_SUNRPC_DEBUG) if (sunrpc_table_header) { unregister_sysctl_table(sunrpc_table_header); sunrpc_table_header = NULL; } #endif rc = xprt_unregister_transport(&xprt_rdma); if (rc) dprintk("RPC: %s: xprt_unregister returned %i\n", __func__, rc); rpcrdma_destroy_wq(); rc = xprt_unregister_transport(&xprt_rdma_bc); if (rc) dprintk("RPC: %s: xprt_unregister(bc) returned %i\n", __func__, rc); } int xprt_rdma_init(void) { int rc; rc = rpcrdma_alloc_wq(); if (rc) return rc; rc = xprt_register_transport(&xprt_rdma); if (rc) { rpcrdma_destroy_wq(); return rc; } rc = xprt_register_transport(&xprt_rdma_bc); if (rc) { xprt_unregister_transport(&xprt_rdma); rpcrdma_destroy_wq(); return rc; } dprintk("RPCRDMA Module Init, register RPC RDMA transport\n"); dprintk("Defaults:\n"); dprintk("\tSlots %d\n" "\tMaxInlineRead %d\n\tMaxInlineWrite %d\n", xprt_rdma_slot_table_entries, xprt_rdma_max_inline_read, xprt_rdma_max_inline_write); dprintk("\tPadding 0\n\tMemreg %d\n", xprt_rdma_memreg_strategy); #if IS_ENABLED(CONFIG_SUNRPC_DEBUG) if (!sunrpc_table_header) sunrpc_table_header = register_sysctl_table(sunrpc_table); #endif return 0; }