/* * 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 "xprt_rdma.h" #ifdef RPC_DEBUG # define RPCDBG_FACILITY RPCDBG_TRANS #endif MODULE_LICENSE("Dual BSD/GPL"); MODULE_DESCRIPTION("RPC/RDMA Transport for Linux kernel NFS"); MODULE_AUTHOR("Network Appliance, Inc."); /* * tunables */ static unsigned int xprt_rdma_slot_table_entries = RPCRDMA_DEF_SLOT_TABLE; static unsigned int xprt_rdma_max_inline_read = RPCRDMA_DEF_INLINE; static unsigned int xprt_rdma_max_inline_write = RPCRDMA_DEF_INLINE; static unsigned int xprt_rdma_inline_write_padding; static unsigned int xprt_rdma_memreg_strategy = RPCRDMA_FRMR; int xprt_rdma_pad_optimize = 0; #ifdef RPC_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 zero; static unsigned int max_padding = PAGE_SIZE; static unsigned int min_memreg = RPCRDMA_BOUNCEBUFFERS; static unsigned int max_memreg = RPCRDMA_LAST - 1; static struct ctl_table_header *sunrpc_table_header; static 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, }, { .procname = "rdma_max_inline_write", .data = &xprt_rdma_max_inline_write, .maxlen = sizeof(unsigned int), .mode = 0644, .proc_handler = proc_dointvec, }, { .procname = "rdma_inline_write_padding", .data = &xprt_rdma_inline_write_padding, .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 ctl_table sunrpc_table[] = { { .procname = "sunrpc", .mode = 0555, .child = xr_tunables_table }, { }, }; #endif static struct rpc_xprt_ops xprt_rdma_procs; /* forward reference */ static void xprt_rdma_format_addresses(struct rpc_xprt *xprt) { struct sockaddr *sap = (struct sockaddr *) &rpcx_to_rdmad(xprt).addr; struct sockaddr_in *sin = (struct sockaddr_in *)sap; char buf[64]; (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); xprt->address_strings[RPC_DISPLAY_PROTO] = "rdma"; snprintf(buf, sizeof(buf), "%08x", ntohl(sin->sin_addr.s_addr)); xprt->address_strings[RPC_DISPLAY_HEX_ADDR] = kstrdup(buf, GFP_KERNEL); snprintf(buf, sizeof(buf), "%4hx", rpc_get_port(sap)); xprt->address_strings[RPC_DISPLAY_HEX_PORT] = kstrdup(buf, GFP_KERNEL); /* netid */ xprt->address_strings[RPC_DISPLAY_NETID] = "rdma"; } static 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]); } } static void xprt_rdma_connect_worker(struct work_struct *work) { struct rpcrdma_xprt *r_xprt = container_of(work, struct rpcrdma_xprt, rdma_connect.work); struct rpc_xprt *xprt = &r_xprt->xprt; int rc = 0; if (!xprt->shutdown) { xprt_clear_connected(xprt); dprintk("RPC: %s: %sconnect\n", __func__, r_xprt->rx_ep.rep_connected != 0 ? "re" : ""); rc = rpcrdma_ep_connect(&r_xprt->rx_ep, &r_xprt->rx_ia); if (rc) goto out; } goto out_clear; out: xprt_wake_pending_tasks(xprt, rc); out_clear: dprintk("RPC: %s: exit\n", __func__); xprt_clear_connecting(xprt); } /* * 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); int rc; dprintk("RPC: %s: called\n", __func__); cancel_delayed_work_sync(&r_xprt->rdma_connect); xprt_clear_connected(xprt); rpcrdma_buffer_destroy(&r_xprt->rx_buf); rc = rpcrdma_ep_destroy(&r_xprt->rx_ep, &r_xprt->rx_ia); if (rc) dprintk("RPC: %s: rpcrdma_ep_destroy returned %i\n", __func__, rc); rpcrdma_ia_close(&r_xprt->rx_ia); xprt_rdma_free_addresses(xprt); xprt_free(xprt); dprintk("RPC: %s: returning\n", __func__); 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_in *sin; 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), xprt_rdma_slot_table_entries); 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 = (60U * HZ); xprt->reestablish_timeout = (5U * HZ); xprt->idle_timeout = (5U * 60 * HZ); xprt->resvport = 0; /* privileged port not needed */ xprt->tsh_size = 0; /* RPC-RDMA handles framing */ xprt->max_payload = RPCRDMA_MAX_DATA_SEGS * PAGE_SIZE; xprt->ops = &xprt_rdma_procs; /* * Set up RDMA-specific connect data. */ /* Put server RDMA address in local cdata */ memcpy(&cdata.addr, args->dstaddr, args->addrlen); /* 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, &cdata.addr, xprt->addrlen); sin = (struct sockaddr_in *)&cdata.addr; if (ntohs(sin->sin_port) != 0) xprt_set_bound(xprt); dprintk("RPC: %s: %pI4:%u\n", __func__, &sin->sin_addr.s_addr, ntohs(sin->sin_port)); /* Set max requests */ cdata.max_requests = xprt->max_reqs; /* Set some length limits */ 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; cdata.padding = xprt_rdma_inline_write_padding; /* * 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, (struct sockaddr *) &cdata.addr, xprt_rdma_memreg_strategy); if (rc) goto out1; /* * initialize and create ep */ new_xprt->rx_data = cdata; new_ep = &new_xprt->rx_ep; new_ep->rep_remote_addr = cdata.addr; rc = rpcrdma_ep_create(&new_xprt->rx_ep, &new_xprt->rx_ia, &new_xprt->rx_data); if (rc) goto out2; /* * Allocate pre-registered send and receive buffers for headers and * any inline data. Also specify any padding which will be provided * from a preregistered zero buffer. */ rc = rpcrdma_buffer_create(&new_xprt->rx_buf, new_ep, &new_xprt->rx_ia, &new_xprt->rx_data); if (rc) goto out3; /* * Register a callback for connection events. This is necessary because * connection loss notification is async. We also catch connection loss * when reaping receives. */ INIT_DELAYED_WORK(&new_xprt->rdma_connect, xprt_rdma_connect_worker); new_ep->rep_func = rpcrdma_conn_func; new_ep->rep_xprt = xprt; xprt_rdma_format_addresses(xprt); if (!try_module_get(THIS_MODULE)) goto out4; return xprt; out4: xprt_rdma_free_addresses(xprt); rc = -EINVAL; out3: (void) rpcrdma_ep_destroy(new_ep, &new_xprt->rx_ia); out2: rpcrdma_ia_close(&new_xprt->rx_ia); out1: xprt_free(xprt); return ERR_PTR(rc); } /* * Close a connection, during shutdown or timeout/reconnect */ static void xprt_rdma_close(struct rpc_xprt *xprt) { struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(xprt); dprintk("RPC: %s: closing\n", __func__); if (r_xprt->rx_ep.rep_connected > 0) xprt->reestablish_timeout = 0; xprt_disconnect_done(xprt); (void) rpcrdma_ep_disconnect(&r_xprt->rx_ep, &r_xprt->rx_ia); } static void xprt_rdma_set_port(struct rpc_xprt *xprt, u16 port) { struct sockaddr_in *sap; sap = (struct sockaddr_in *)&xprt->addr; sap->sin_port = htons(port); sap = (struct sockaddr_in *)&rpcx_to_rdmad(xprt).addr; sap->sin_port = htons(port); dprintk("RPC: %s: %u\n", __func__, port); } static void xprt_rdma_connect(struct rpc_task *task) { struct rpc_xprt *xprt = (struct rpc_xprt *)task->tk_xprt; struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(xprt); if (r_xprt->rx_ep.rep_connected != 0) { /* Reconnect */ schedule_delayed_work(&r_xprt->rdma_connect, xprt->reestablish_timeout); xprt->reestablish_timeout <<= 1; if (xprt->reestablish_timeout > (30 * HZ)) xprt->reestablish_timeout = (30 * HZ); else if (xprt->reestablish_timeout < (5 * HZ)) xprt->reestablish_timeout = (5 * HZ); } else { schedule_delayed_work(&r_xprt->rdma_connect, 0); if (!RPC_IS_ASYNC(task)) flush_delayed_work(&r_xprt->rdma_connect); } } static int xprt_rdma_reserve_xprt(struct rpc_xprt *xprt, struct rpc_task *task) { struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(xprt); int credits = atomic_read(&r_xprt->rx_buf.rb_credits); /* == RPC_CWNDSCALE @ init, but *after* setup */ if (r_xprt->rx_buf.rb_cwndscale == 0UL) { r_xprt->rx_buf.rb_cwndscale = xprt->cwnd; dprintk("RPC: %s: cwndscale %lu\n", __func__, r_xprt->rx_buf.rb_cwndscale); BUG_ON(r_xprt->rx_buf.rb_cwndscale <= 0); } xprt->cwnd = credits * r_xprt->rx_buf.rb_cwndscale; return xprt_reserve_xprt_cong(xprt, task); } /* * 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. For this reason, the recv buffers are attached to send * buffers for portions of the RPC. Note that the RPC layer allocates * both send and receive buffers in the same call. We may register * the receive buffer portion when using reply chunks. */ static void * xprt_rdma_allocate(struct rpc_task *task, size_t size) { struct rpc_xprt *xprt = task->tk_xprt; struct rpcrdma_req *req, *nreq; req = rpcrdma_buffer_get(&rpcx_to_rdmax(xprt)->rx_buf); BUG_ON(NULL == req); if (size > req->rl_size) { dprintk("RPC: %s: size %zd too large for buffer[%zd]: " "prog %d vers %d proc %d\n", __func__, size, req->rl_size, task->tk_client->cl_prog, task->tk_client->cl_vers, task->tk_msg.rpc_proc->p_proc); /* * Outgoing length shortage. Our inline write max must have * been configured to perform direct i/o. * * This is therefore a large metadata operation, and the * allocate call was made on the maximum possible message, * e.g. containing long filename(s) or symlink data. In * fact, while these metadata operations *might* carry * large outgoing payloads, they rarely *do*. However, we * have to commit to the request here, so reallocate and * register it now. The data path will never require this * reallocation. * * If the allocation or registration fails, the RPC framework * will (doggedly) retry. */ if (rpcx_to_rdmax(xprt)->rx_ia.ri_memreg_strategy == RPCRDMA_BOUNCEBUFFERS) { /* forced to "pure inline" */ dprintk("RPC: %s: too much data (%zd) for inline " "(r/w max %d/%d)\n", __func__, size, rpcx_to_rdmad(xprt).inline_rsize, rpcx_to_rdmad(xprt).inline_wsize); size = req->rl_size; rpc_exit(task, -EIO); /* fail the operation */ rpcx_to_rdmax(xprt)->rx_stats.failed_marshal_count++; goto out; } if (task->tk_flags & RPC_TASK_SWAPPER) nreq = kmalloc(sizeof *req + size, GFP_ATOMIC); else nreq = kmalloc(sizeof *req + size, GFP_NOFS); if (nreq == NULL) goto outfail; if (rpcrdma_register_internal(&rpcx_to_rdmax(xprt)->rx_ia, nreq->rl_base, size + sizeof(struct rpcrdma_req) - offsetof(struct rpcrdma_req, rl_base), &nreq->rl_handle, &nreq->rl_iov)) { kfree(nreq); goto outfail; } rpcx_to_rdmax(xprt)->rx_stats.hardway_register_count += size; nreq->rl_size = size; nreq->rl_niovs = 0; nreq->rl_nchunks = 0; nreq->rl_buffer = (struct rpcrdma_buffer *)req; nreq->rl_reply = req->rl_reply; memcpy(nreq->rl_segments, req->rl_segments, sizeof nreq->rl_segments); /* flag the swap with an unused field */ nreq->rl_iov.length = 0; req->rl_reply = NULL; req = nreq; } dprintk("RPC: %s: size %zd, request 0x%p\n", __func__, size, req); out: req->rl_connect_cookie = 0; /* our reserved value */ return req->rl_xdr_buf; outfail: rpcrdma_buffer_put(req); rpcx_to_rdmax(xprt)->rx_stats.failed_marshal_count++; return NULL; } /* * This function returns all RDMA resources to the pool. */ static void xprt_rdma_free(void *buffer) { struct rpcrdma_req *req; struct rpcrdma_xprt *r_xprt; struct rpcrdma_rep *rep; int i; if (buffer == NULL) return; req = container_of(buffer, struct rpcrdma_req, rl_xdr_buf[0]); if (req->rl_iov.length == 0) { /* see allocate above */ r_xprt = container_of(((struct rpcrdma_req *) req->rl_buffer)->rl_buffer, struct rpcrdma_xprt, rx_buf); } else r_xprt = container_of(req->rl_buffer, struct rpcrdma_xprt, rx_buf); rep = req->rl_reply; dprintk("RPC: %s: called on 0x%p%s\n", __func__, rep, (rep && rep->rr_func) ? " (with waiter)" : ""); /* * Finish the deregistration. When using mw bind, this was * begun in rpcrdma_reply_handler(). In all other modes, we * do it here, in thread context. The process is considered * complete when the rr_func vector becomes NULL - this * was put in place during rpcrdma_reply_handler() - the wait * call below will not block if the dereg is "done". If * interrupted, our framework will clean up. */ for (i = 0; req->rl_nchunks;) { --req->rl_nchunks; i += rpcrdma_deregister_external( &req->rl_segments[i], r_xprt, NULL); } if (rep && wait_event_interruptible(rep->rr_unbind, !rep->rr_func)) { rep->rr_func = NULL; /* abandon the callback */ req->rl_reply = NULL; } if (req->rl_iov.length == 0) { /* see allocate above */ struct rpcrdma_req *oreq = (struct rpcrdma_req *)req->rl_buffer; oreq->rl_reply = req->rl_reply; (void) rpcrdma_deregister_internal(&r_xprt->rx_ia, req->rl_handle, &req->rl_iov); kfree(req); req = oreq; } /* Put back request+reply buffers */ rpcrdma_buffer_put(req); } /* * send_request invokes the meat of RPC RDMA. It must do the following: * 1. Marshal the RPC request into an RPC RDMA request, which means * putting a header in front of data, and creating IOVs for RDMA * from those in the request. * 2. In marshaling, detect opportunities for RDMA, and use them. * 3. Post a recv message to set up asynch completion, then send * the request (rpcrdma_ep_post). * 4. No partial sends are possible in the RPC-RDMA protocol (as in UDP). */ static int xprt_rdma_send_request(struct rpc_task *task) { struct rpc_rqst *rqst = task->tk_rqstp; struct rpc_xprt *xprt = task->tk_xprt; struct rpcrdma_req *req = rpcr_to_rdmar(rqst); struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(xprt); /* marshal the send itself */ if (req->rl_niovs == 0 && rpcrdma_marshal_req(rqst) != 0) { r_xprt->rx_stats.failed_marshal_count++; dprintk("RPC: %s: rpcrdma_marshal_req failed\n", __func__); return -EIO; } if (req->rl_reply == NULL) /* e.g. reconnection */ rpcrdma_recv_buffer_get(req); if (req->rl_reply) { req->rl_reply->rr_func = rpcrdma_reply_handler; /* this need only be done once, but... */ req->rl_reply->rr_xprt = xprt; } /* Must suppress retransmit to maintain credits */ if (req->rl_connect_cookie == xprt->connect_cookie) goto drop_connection; req->rl_connect_cookie = xprt->connect_cookie; 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; return 0; drop_connection: xprt_disconnect_done(xprt); return -ENOTCONN; /* implies disconnect */ } static 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_printf(seq, "\txprt:\trdma %u %lu %lu %lu %ld %lu %lu %lu %Lu %Lu " "%lu %lu %lu %Lu %Lu %Lu %Lu %lu %lu %lu\n", 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, 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); } /* * Plumbing for rpc transport switch and kernel module */ static struct rpc_xprt_ops xprt_rdma_procs = { .reserve_xprt = xprt_rdma_reserve_xprt, .release_xprt = xprt_release_xprt_cong, /* sunrpc/xprt.c */ .release_request = xprt_release_rqst_cong, /* ditto */ .set_retrans_timeout = xprt_set_retrans_timeout_def, /* ditto */ .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 }; 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, }; static void __exit xprt_rdma_cleanup(void) { int rc; dprintk(KERN_INFO "RPCRDMA Module Removed, deregister RPC RDMA transport\n"); #ifdef RPC_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); } static int __init xprt_rdma_init(void) { int rc; rc = xprt_register_transport(&xprt_rdma); if (rc) return rc; dprintk(KERN_INFO "RPCRDMA Module Init, register RPC RDMA transport\n"); dprintk(KERN_INFO "Defaults:\n"); dprintk(KERN_INFO "\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(KERN_INFO "\tPadding %d\n\tMemreg %d\n", xprt_rdma_inline_write_padding, xprt_rdma_memreg_strategy); #ifdef RPC_DEBUG if (!sunrpc_table_header) sunrpc_table_header = register_sysctl_table(sunrpc_table); #endif return 0; } module_init(xprt_rdma_init); module_exit(xprt_rdma_cleanup);