2 * Copyright (c) 2003-2007 Network Appliance, Inc. All rights reserved.
4 * This software is available to you under a choice of one of two
5 * licenses. You may choose to be licensed under the terms of the GNU
6 * General Public License (GPL) Version 2, available from the file
7 * COPYING in the main directory of this source tree, or the BSD-type
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11 * modification, are permitted provided that the following conditions
14 * Redistributions of source code must retain the above copyright
15 * notice, this list of conditions and the following disclaimer.
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18 * copyright notice, this list of conditions and the following
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20 * with the distribution.
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23 * its contributors may be used to endorse or promote products
24 * derived from this software without specific prior written
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36 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
37 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
43 * This file contains the top-level implementation of an RPC RDMA
46 * Naming convention: functions beginning with xprt_ are part of the
47 * transport switch. All others are RPC RDMA internal.
50 #include <linux/module.h>
51 #include <linux/slab.h>
52 #include <linux/seq_file.h>
53 #include <linux/sunrpc/addr.h>
55 #include "xprt_rdma.h"
57 #if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
58 # define RPCDBG_FACILITY RPCDBG_TRANS
65 static unsigned int xprt_rdma_slot_table_entries = RPCRDMA_DEF_SLOT_TABLE;
66 static unsigned int xprt_rdma_max_inline_read = RPCRDMA_DEF_INLINE;
67 static unsigned int xprt_rdma_max_inline_write = RPCRDMA_DEF_INLINE;
68 static unsigned int xprt_rdma_inline_write_padding;
69 static unsigned int xprt_rdma_memreg_strategy = RPCRDMA_FRMR;
70 int xprt_rdma_pad_optimize = 1;
72 #if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
74 static unsigned int min_slot_table_size = RPCRDMA_MIN_SLOT_TABLE;
75 static unsigned int max_slot_table_size = RPCRDMA_MAX_SLOT_TABLE;
76 static unsigned int zero;
77 static unsigned int max_padding = PAGE_SIZE;
78 static unsigned int min_memreg = RPCRDMA_BOUNCEBUFFERS;
79 static unsigned int max_memreg = RPCRDMA_LAST - 1;
81 static struct ctl_table_header *sunrpc_table_header;
83 static struct ctl_table xr_tunables_table[] = {
85 .procname = "rdma_slot_table_entries",
86 .data = &xprt_rdma_slot_table_entries,
87 .maxlen = sizeof(unsigned int),
89 .proc_handler = proc_dointvec_minmax,
90 .extra1 = &min_slot_table_size,
91 .extra2 = &max_slot_table_size
94 .procname = "rdma_max_inline_read",
95 .data = &xprt_rdma_max_inline_read,
96 .maxlen = sizeof(unsigned int),
98 .proc_handler = proc_dointvec,
101 .procname = "rdma_max_inline_write",
102 .data = &xprt_rdma_max_inline_write,
103 .maxlen = sizeof(unsigned int),
105 .proc_handler = proc_dointvec,
108 .procname = "rdma_inline_write_padding",
109 .data = &xprt_rdma_inline_write_padding,
110 .maxlen = sizeof(unsigned int),
112 .proc_handler = proc_dointvec_minmax,
114 .extra2 = &max_padding,
117 .procname = "rdma_memreg_strategy",
118 .data = &xprt_rdma_memreg_strategy,
119 .maxlen = sizeof(unsigned int),
121 .proc_handler = proc_dointvec_minmax,
122 .extra1 = &min_memreg,
123 .extra2 = &max_memreg,
126 .procname = "rdma_pad_optimize",
127 .data = &xprt_rdma_pad_optimize,
128 .maxlen = sizeof(unsigned int),
130 .proc_handler = proc_dointvec,
135 static struct ctl_table sunrpc_table[] = {
137 .procname = "sunrpc",
139 .child = xr_tunables_table
146 #define RPCRDMA_BIND_TO (60U * HZ)
147 #define RPCRDMA_INIT_REEST_TO (5U * HZ)
148 #define RPCRDMA_MAX_REEST_TO (30U * HZ)
149 #define RPCRDMA_IDLE_DISC_TO (5U * 60 * HZ)
151 static struct rpc_xprt_ops xprt_rdma_procs; /* forward reference */
154 xprt_rdma_format_addresses4(struct rpc_xprt *xprt, struct sockaddr *sap)
156 struct sockaddr_in *sin = (struct sockaddr_in *)sap;
159 snprintf(buf, sizeof(buf), "%08x", ntohl(sin->sin_addr.s_addr));
160 xprt->address_strings[RPC_DISPLAY_HEX_ADDR] = kstrdup(buf, GFP_KERNEL);
162 xprt->address_strings[RPC_DISPLAY_NETID] = RPCBIND_NETID_RDMA;
166 xprt_rdma_format_addresses6(struct rpc_xprt *xprt, struct sockaddr *sap)
168 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
171 snprintf(buf, sizeof(buf), "%pi6", &sin6->sin6_addr);
172 xprt->address_strings[RPC_DISPLAY_HEX_ADDR] = kstrdup(buf, GFP_KERNEL);
174 xprt->address_strings[RPC_DISPLAY_NETID] = RPCBIND_NETID_RDMA6;
178 xprt_rdma_format_addresses(struct rpc_xprt *xprt)
180 struct sockaddr *sap = (struct sockaddr *)
181 &rpcx_to_rdmad(xprt).addr;
184 switch (sap->sa_family) {
186 xprt_rdma_format_addresses4(xprt, sap);
189 xprt_rdma_format_addresses6(xprt, sap);
192 pr_err("rpcrdma: Unrecognized address family\n");
196 (void)rpc_ntop(sap, buf, sizeof(buf));
197 xprt->address_strings[RPC_DISPLAY_ADDR] = kstrdup(buf, GFP_KERNEL);
199 snprintf(buf, sizeof(buf), "%u", rpc_get_port(sap));
200 xprt->address_strings[RPC_DISPLAY_PORT] = kstrdup(buf, GFP_KERNEL);
202 snprintf(buf, sizeof(buf), "%4hx", rpc_get_port(sap));
203 xprt->address_strings[RPC_DISPLAY_HEX_PORT] = kstrdup(buf, GFP_KERNEL);
205 xprt->address_strings[RPC_DISPLAY_PROTO] = "rdma";
209 xprt_rdma_free_addresses(struct rpc_xprt *xprt)
213 for (i = 0; i < RPC_DISPLAY_MAX; i++)
215 case RPC_DISPLAY_PROTO:
216 case RPC_DISPLAY_NETID:
219 kfree(xprt->address_strings[i]);
224 xprt_rdma_connect_worker(struct work_struct *work)
226 struct rpcrdma_xprt *r_xprt = container_of(work, struct rpcrdma_xprt,
227 rx_connect_worker.work);
228 struct rpc_xprt *xprt = &r_xprt->rx_xprt;
231 xprt_clear_connected(xprt);
233 dprintk("RPC: %s: %sconnect\n", __func__,
234 r_xprt->rx_ep.rep_connected != 0 ? "re" : "");
235 rc = rpcrdma_ep_connect(&r_xprt->rx_ep, &r_xprt->rx_ia);
237 xprt_wake_pending_tasks(xprt, rc);
239 dprintk("RPC: %s: exit\n", __func__);
240 xprt_clear_connecting(xprt);
247 * Free all memory associated with the object, including its own.
248 * NOTE: none of the *destroy methods free memory for their top-level
249 * objects, even though they may have allocated it (they do free
250 * private memory). It's up to the caller to handle it. In this
251 * case (RDMA transport), all structure memory is inlined with the
252 * struct rpcrdma_xprt.
255 xprt_rdma_destroy(struct rpc_xprt *xprt)
257 struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(xprt);
259 dprintk("RPC: %s: called\n", __func__);
261 cancel_delayed_work_sync(&r_xprt->rx_connect_worker);
263 xprt_clear_connected(xprt);
265 rpcrdma_buffer_destroy(&r_xprt->rx_buf);
266 rpcrdma_ep_destroy(&r_xprt->rx_ep, &r_xprt->rx_ia);
267 rpcrdma_ia_close(&r_xprt->rx_ia);
269 xprt_rdma_free_addresses(xprt);
273 dprintk("RPC: %s: returning\n", __func__);
275 module_put(THIS_MODULE);
278 static const struct rpc_timeout xprt_rdma_default_timeout = {
279 .to_initval = 60 * HZ,
280 .to_maxval = 60 * HZ,
284 * xprt_setup_rdma - Set up transport to use RDMA
286 * @args: rpc transport arguments
288 static struct rpc_xprt *
289 xprt_setup_rdma(struct xprt_create *args)
291 struct rpcrdma_create_data_internal cdata;
292 struct rpc_xprt *xprt;
293 struct rpcrdma_xprt *new_xprt;
294 struct rpcrdma_ep *new_ep;
295 struct sockaddr_in *sin;
298 if (args->addrlen > sizeof(xprt->addr)) {
299 dprintk("RPC: %s: address too large\n", __func__);
300 return ERR_PTR(-EBADF);
303 xprt = xprt_alloc(args->net, sizeof(struct rpcrdma_xprt),
304 xprt_rdma_slot_table_entries,
305 xprt_rdma_slot_table_entries);
307 dprintk("RPC: %s: couldn't allocate rpcrdma_xprt\n",
309 return ERR_PTR(-ENOMEM);
312 /* 60 second timeout, no retries */
313 xprt->timeout = &xprt_rdma_default_timeout;
314 xprt->bind_timeout = RPCRDMA_BIND_TO;
315 xprt->reestablish_timeout = RPCRDMA_INIT_REEST_TO;
316 xprt->idle_timeout = RPCRDMA_IDLE_DISC_TO;
318 xprt->resvport = 0; /* privileged port not needed */
319 xprt->tsh_size = 0; /* RPC-RDMA handles framing */
320 xprt->ops = &xprt_rdma_procs;
323 * Set up RDMA-specific connect data.
326 /* Put server RDMA address in local cdata */
327 memcpy(&cdata.addr, args->dstaddr, args->addrlen);
329 /* Ensure xprt->addr holds valid server TCP (not RDMA)
330 * address, for any side protocols which peek at it */
331 xprt->prot = IPPROTO_TCP;
332 xprt->addrlen = args->addrlen;
333 memcpy(&xprt->addr, &cdata.addr, xprt->addrlen);
335 sin = (struct sockaddr_in *)&cdata.addr;
336 if (ntohs(sin->sin_port) != 0)
337 xprt_set_bound(xprt);
339 dprintk("RPC: %s: %pI4:%u\n",
340 __func__, &sin->sin_addr.s_addr, ntohs(sin->sin_port));
342 /* Set max requests */
343 cdata.max_requests = xprt->max_reqs;
345 /* Set some length limits */
346 cdata.rsize = RPCRDMA_MAX_SEGS * PAGE_SIZE; /* RDMA write max */
347 cdata.wsize = RPCRDMA_MAX_SEGS * PAGE_SIZE; /* RDMA read max */
349 cdata.inline_wsize = xprt_rdma_max_inline_write;
350 if (cdata.inline_wsize > cdata.wsize)
351 cdata.inline_wsize = cdata.wsize;
353 cdata.inline_rsize = xprt_rdma_max_inline_read;
354 if (cdata.inline_rsize > cdata.rsize)
355 cdata.inline_rsize = cdata.rsize;
357 cdata.padding = xprt_rdma_inline_write_padding;
360 * Create new transport instance, which includes initialized
366 new_xprt = rpcx_to_rdmax(xprt);
368 rc = rpcrdma_ia_open(new_xprt, (struct sockaddr *) &cdata.addr,
369 xprt_rdma_memreg_strategy);
374 * initialize and create ep
376 new_xprt->rx_data = cdata;
377 new_ep = &new_xprt->rx_ep;
378 new_ep->rep_remote_addr = cdata.addr;
380 rc = rpcrdma_ep_create(&new_xprt->rx_ep,
381 &new_xprt->rx_ia, &new_xprt->rx_data);
386 * Allocate pre-registered send and receive buffers for headers and
387 * any inline data. Also specify any padding which will be provided
388 * from a preregistered zero buffer.
390 rc = rpcrdma_buffer_create(new_xprt);
395 * Register a callback for connection events. This is necessary because
396 * connection loss notification is async. We also catch connection loss
397 * when reaping receives.
399 INIT_DELAYED_WORK(&new_xprt->rx_connect_worker,
400 xprt_rdma_connect_worker);
402 xprt_rdma_format_addresses(xprt);
403 xprt->max_payload = new_xprt->rx_ia.ri_ops->ro_maxpages(new_xprt);
404 if (xprt->max_payload == 0)
406 xprt->max_payload <<= PAGE_SHIFT;
407 dprintk("RPC: %s: transport data payload maximum: %zu bytes\n",
408 __func__, xprt->max_payload);
410 if (!try_module_get(THIS_MODULE))
416 xprt_rdma_free_addresses(xprt);
419 rpcrdma_ep_destroy(new_ep, &new_xprt->rx_ia);
421 rpcrdma_ia_close(&new_xprt->rx_ia);
428 * Close a connection, during shutdown or timeout/reconnect
431 xprt_rdma_close(struct rpc_xprt *xprt)
433 struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(xprt);
435 dprintk("RPC: %s: closing\n", __func__);
436 if (r_xprt->rx_ep.rep_connected > 0)
437 xprt->reestablish_timeout = 0;
438 xprt_disconnect_done(xprt);
439 rpcrdma_ep_disconnect(&r_xprt->rx_ep, &r_xprt->rx_ia);
443 xprt_rdma_set_port(struct rpc_xprt *xprt, u16 port)
445 struct sockaddr_in *sap;
447 sap = (struct sockaddr_in *)&xprt->addr;
448 sap->sin_port = htons(port);
449 sap = (struct sockaddr_in *)&rpcx_to_rdmad(xprt).addr;
450 sap->sin_port = htons(port);
451 dprintk("RPC: %s: %u\n", __func__, port);
455 xprt_rdma_connect(struct rpc_xprt *xprt, struct rpc_task *task)
457 struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(xprt);
459 if (r_xprt->rx_ep.rep_connected != 0) {
461 schedule_delayed_work(&r_xprt->rx_connect_worker,
462 xprt->reestablish_timeout);
463 xprt->reestablish_timeout <<= 1;
464 if (xprt->reestablish_timeout > RPCRDMA_MAX_REEST_TO)
465 xprt->reestablish_timeout = RPCRDMA_MAX_REEST_TO;
466 else if (xprt->reestablish_timeout < RPCRDMA_INIT_REEST_TO)
467 xprt->reestablish_timeout = RPCRDMA_INIT_REEST_TO;
469 schedule_delayed_work(&r_xprt->rx_connect_worker, 0);
470 if (!RPC_IS_ASYNC(task))
471 flush_delayed_work(&r_xprt->rx_connect_worker);
476 * The RDMA allocate/free functions need the task structure as a place
477 * to hide the struct rpcrdma_req, which is necessary for the actual send/recv
480 * The RPC layer allocates both send and receive buffers in the same call
481 * (rq_send_buf and rq_rcv_buf are both part of a single contiguous buffer).
482 * We may register rq_rcv_buf when using reply chunks.
485 xprt_rdma_allocate(struct rpc_task *task, size_t size)
487 struct rpc_xprt *xprt = task->tk_rqstp->rq_xprt;
488 struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(xprt);
489 struct rpcrdma_regbuf *rb;
490 struct rpcrdma_req *req;
494 req = rpcrdma_buffer_get(&r_xprt->rx_buf);
498 flags = GFP_NOIO | __GFP_NOWARN;
499 if (RPC_IS_SWAPPER(task))
500 flags = __GFP_MEMALLOC | GFP_NOWAIT | __GFP_NOWARN;
502 if (req->rl_rdmabuf == NULL)
504 if (req->rl_sendbuf == NULL)
506 if (size > req->rl_sendbuf->rg_size)
510 dprintk("RPC: %s: size %zd, request 0x%p\n", __func__, size, req);
511 req->rl_connect_cookie = 0; /* our reserved value */
512 return req->rl_sendbuf->rg_base;
515 min_size = RPCRDMA_INLINE_WRITE_THRESHOLD(task->tk_rqstp);
516 rb = rpcrdma_alloc_regbuf(&r_xprt->rx_ia, min_size, flags);
519 req->rl_rdmabuf = rb;
522 /* XDR encoding and RPC/RDMA marshaling of this request has not
523 * yet occurred. Thus a lower bound is needed to prevent buffer
524 * overrun during marshaling.
526 * RPC/RDMA marshaling may choose to send payload bearing ops
527 * inline, if the result is smaller than the inline threshold.
528 * The value of the "size" argument accounts for header
529 * requirements but not for the payload in these cases.
531 * Likewise, allocate enough space to receive a reply up to the
532 * size of the inline threshold.
534 * It's unlikely that both the send header and the received
535 * reply will be large, but slush is provided here to allow
536 * flexibility when marshaling.
538 min_size = RPCRDMA_INLINE_READ_THRESHOLD(task->tk_rqstp);
539 min_size += RPCRDMA_INLINE_WRITE_THRESHOLD(task->tk_rqstp);
543 rb = rpcrdma_alloc_regbuf(&r_xprt->rx_ia, size, flags);
548 r_xprt->rx_stats.hardway_register_count += size;
549 rpcrdma_free_regbuf(&r_xprt->rx_ia, req->rl_sendbuf);
550 req->rl_sendbuf = rb;
554 rpcrdma_buffer_put(req);
555 r_xprt->rx_stats.failed_marshal_count++;
560 * This function returns all RDMA resources to the pool.
563 xprt_rdma_free(void *buffer)
565 struct rpcrdma_req *req;
566 struct rpcrdma_xprt *r_xprt;
567 struct rpcrdma_regbuf *rb;
573 rb = container_of(buffer, struct rpcrdma_regbuf, rg_base[0]);
575 r_xprt = container_of(req->rl_buffer, struct rpcrdma_xprt, rx_buf);
577 dprintk("RPC: %s: called on 0x%p\n", __func__, req->rl_reply);
579 for (i = 0; req->rl_nchunks;) {
581 i += r_xprt->rx_ia.ri_ops->ro_unmap(r_xprt,
582 &req->rl_segments[i]);
585 rpcrdma_buffer_put(req);
589 * send_request invokes the meat of RPC RDMA. It must do the following:
590 * 1. Marshal the RPC request into an RPC RDMA request, which means
591 * putting a header in front of data, and creating IOVs for RDMA
592 * from those in the request.
593 * 2. In marshaling, detect opportunities for RDMA, and use them.
594 * 3. Post a recv message to set up asynch completion, then send
595 * the request (rpcrdma_ep_post).
596 * 4. No partial sends are possible in the RPC-RDMA protocol (as in UDP).
600 xprt_rdma_send_request(struct rpc_task *task)
602 struct rpc_rqst *rqst = task->tk_rqstp;
603 struct rpc_xprt *xprt = rqst->rq_xprt;
604 struct rpcrdma_req *req = rpcr_to_rdmar(rqst);
605 struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(xprt);
608 rc = rpcrdma_marshal_req(rqst);
612 if (req->rl_reply == NULL) /* e.g. reconnection */
613 rpcrdma_recv_buffer_get(req);
616 req->rl_reply->rr_func = rpcrdma_reply_handler;
617 /* this need only be done once, but... */
618 req->rl_reply->rr_xprt = xprt;
621 /* Must suppress retransmit to maintain credits */
622 if (req->rl_connect_cookie == xprt->connect_cookie)
623 goto drop_connection;
624 req->rl_connect_cookie = xprt->connect_cookie;
626 if (rpcrdma_ep_post(&r_xprt->rx_ia, &r_xprt->rx_ep, req))
627 goto drop_connection;
629 rqst->rq_xmit_bytes_sent += rqst->rq_snd_buf.len;
630 rqst->rq_bytes_sent = 0;
634 r_xprt->rx_stats.failed_marshal_count++;
635 dprintk("RPC: %s: rpcrdma_marshal_req failed, status %i\n",
640 xprt_disconnect_done(xprt);
641 return -ENOTCONN; /* implies disconnect */
644 static void xprt_rdma_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
646 struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(xprt);
649 if (xprt_connected(xprt))
650 idle_time = (long)(jiffies - xprt->last_used) / HZ;
653 "\txprt:\trdma %u %lu %lu %lu %ld %lu %lu %lu %Lu %Lu "
654 "%lu %lu %lu %Lu %Lu %Lu %Lu %lu %lu %lu\n",
656 0, /* need a local port? */
657 xprt->stat.bind_count,
658 xprt->stat.connect_count,
659 xprt->stat.connect_time,
667 r_xprt->rx_stats.read_chunk_count,
668 r_xprt->rx_stats.write_chunk_count,
669 r_xprt->rx_stats.reply_chunk_count,
670 r_xprt->rx_stats.total_rdma_request,
671 r_xprt->rx_stats.total_rdma_reply,
672 r_xprt->rx_stats.pullup_copy_count,
673 r_xprt->rx_stats.fixup_copy_count,
674 r_xprt->rx_stats.hardway_register_count,
675 r_xprt->rx_stats.failed_marshal_count,
676 r_xprt->rx_stats.bad_reply_count);
680 * Plumbing for rpc transport switch and kernel module
683 static struct rpc_xprt_ops xprt_rdma_procs = {
684 .reserve_xprt = xprt_reserve_xprt_cong,
685 .release_xprt = xprt_release_xprt_cong, /* sunrpc/xprt.c */
686 .alloc_slot = xprt_alloc_slot,
687 .release_request = xprt_release_rqst_cong, /* ditto */
688 .set_retrans_timeout = xprt_set_retrans_timeout_def, /* ditto */
689 .rpcbind = rpcb_getport_async, /* sunrpc/rpcb_clnt.c */
690 .set_port = xprt_rdma_set_port,
691 .connect = xprt_rdma_connect,
692 .buf_alloc = xprt_rdma_allocate,
693 .buf_free = xprt_rdma_free,
694 .send_request = xprt_rdma_send_request,
695 .close = xprt_rdma_close,
696 .destroy = xprt_rdma_destroy,
697 .print_stats = xprt_rdma_print_stats
700 static struct xprt_class xprt_rdma = {
701 .list = LIST_HEAD_INIT(xprt_rdma.list),
703 .owner = THIS_MODULE,
704 .ident = XPRT_TRANSPORT_RDMA,
705 .setup = xprt_setup_rdma,
708 void xprt_rdma_cleanup(void)
712 dprintk("RPCRDMA Module Removed, deregister RPC RDMA transport\n");
713 #if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
714 if (sunrpc_table_header) {
715 unregister_sysctl_table(sunrpc_table_header);
716 sunrpc_table_header = NULL;
719 rc = xprt_unregister_transport(&xprt_rdma);
721 dprintk("RPC: %s: xprt_unregister returned %i\n",
725 int xprt_rdma_init(void)
729 rc = xprt_register_transport(&xprt_rdma);
734 dprintk("RPCRDMA Module Init, register RPC RDMA transport\n");
736 dprintk("Defaults:\n");
737 dprintk("\tSlots %d\n"
738 "\tMaxInlineRead %d\n\tMaxInlineWrite %d\n",
739 xprt_rdma_slot_table_entries,
740 xprt_rdma_max_inline_read, xprt_rdma_max_inline_write);
741 dprintk("\tPadding %d\n\tMemreg %d\n",
742 xprt_rdma_inline_write_padding, xprt_rdma_memreg_strategy);
744 #if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
745 if (!sunrpc_table_header)
746 sunrpc_table_header = register_sysctl_table(sunrpc_table);