| // 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 <linux/module.h> |
| #include <linux/slab.h> |
| #include <linux/seq_file.h> |
| #include <linux/smp.h> |
| |
| #include <linux/sunrpc/addr.h> |
| #include <linux/sunrpc/svc_rdma.h> |
| |
| #include "xprt_rdma.h" |
| #include <trace/events/rpcrdma.h> |
| |
| #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->stat.connect_count++; |
| xprt->stat.connect_time += (long)jiffies - |
| xprt->stat.connect_start; |
| 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_ASYNC(task)) |
| flags = GFP_NOWAIT | __GFP_NOWARN; |
| if (RPC_IS_SWAPPER(task)) |
| flags |= __GFP_MEMALLOC; |
| |
| 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, |
| .netid = { "rdma", "rdma6", "" }, |
| }; |
| |
| 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; |
| } |