1a246b010SChuck Lever /* 2a246b010SChuck Lever * linux/net/sunrpc/xprtsock.c 3a246b010SChuck Lever * 4a246b010SChuck Lever * Client-side transport implementation for sockets. 5a246b010SChuck Lever * 6a246b010SChuck Lever * TCP callback races fixes (C) 1998 Red Hat Software <alan@redhat.com> 7a246b010SChuck Lever * TCP send fixes (C) 1998 Red Hat Software <alan@redhat.com> 8a246b010SChuck Lever * TCP NFS related read + write fixes 9a246b010SChuck Lever * (C) 1999 Dave Airlie, University of Limerick, Ireland <airlied@linux.ie> 10a246b010SChuck Lever * 11a246b010SChuck Lever * Rewrite of larges part of the code in order to stabilize TCP stuff. 12a246b010SChuck Lever * Fix behaviour when socket buffer is full. 13a246b010SChuck Lever * (C) 1999 Trond Myklebust <trond.myklebust@fys.uio.no> 1455aa4f58SChuck Lever * 1555aa4f58SChuck Lever * IP socket transport implementation, (C) 2005 Chuck Lever <cel@netapp.com> 16a246b010SChuck Lever */ 17a246b010SChuck Lever 18a246b010SChuck Lever #include <linux/types.h> 19a246b010SChuck Lever #include <linux/slab.h> 20a246b010SChuck Lever #include <linux/capability.h> 21a246b010SChuck Lever #include <linux/sched.h> 22a246b010SChuck Lever #include <linux/pagemap.h> 23a246b010SChuck Lever #include <linux/errno.h> 24a246b010SChuck Lever #include <linux/socket.h> 25a246b010SChuck Lever #include <linux/in.h> 26a246b010SChuck Lever #include <linux/net.h> 27a246b010SChuck Lever #include <linux/mm.h> 28a246b010SChuck Lever #include <linux/udp.h> 29a246b010SChuck Lever #include <linux/tcp.h> 30a246b010SChuck Lever #include <linux/sunrpc/clnt.h> 31a246b010SChuck Lever #include <linux/file.h> 32a246b010SChuck Lever 33a246b010SChuck Lever #include <net/sock.h> 34a246b010SChuck Lever #include <net/checksum.h> 35a246b010SChuck Lever #include <net/udp.h> 36a246b010SChuck Lever #include <net/tcp.h> 37a246b010SChuck Lever 389903cd1cSChuck Lever /* 39*c556b754SChuck Lever * xprtsock tunables 40*c556b754SChuck Lever */ 41*c556b754SChuck Lever unsigned int xprt_udp_slot_table_entries = RPC_DEF_SLOT_TABLE; 42*c556b754SChuck Lever unsigned int xprt_tcp_slot_table_entries = RPC_DEF_SLOT_TABLE; 43*c556b754SChuck Lever 44*c556b754SChuck Lever unsigned int xprt_min_resvport = RPC_DEF_MIN_RESVPORT; 45*c556b754SChuck Lever unsigned int xprt_max_resvport = RPC_DEF_MAX_RESVPORT; 46*c556b754SChuck Lever 47*c556b754SChuck Lever /* 48262965f5SChuck Lever * How many times to try sending a request on a socket before waiting 49262965f5SChuck Lever * for the socket buffer to clear. 50262965f5SChuck Lever */ 51262965f5SChuck Lever #define XS_SENDMSG_RETRY (10U) 52262965f5SChuck Lever 5303bf4b70SChuck Lever /* 5403bf4b70SChuck Lever * Time out for an RPC UDP socket connect. UDP socket connects are 5503bf4b70SChuck Lever * synchronous, but we set a timeout anyway in case of resource 5603bf4b70SChuck Lever * exhaustion on the local host. 5703bf4b70SChuck Lever */ 5803bf4b70SChuck Lever #define XS_UDP_CONN_TO (5U * HZ) 5903bf4b70SChuck Lever 6003bf4b70SChuck Lever /* 6103bf4b70SChuck Lever * Wait duration for an RPC TCP connection to be established. Solaris 6203bf4b70SChuck Lever * NFS over TCP uses 60 seconds, for example, which is in line with how 6303bf4b70SChuck Lever * long a server takes to reboot. 6403bf4b70SChuck Lever */ 6503bf4b70SChuck Lever #define XS_TCP_CONN_TO (60U * HZ) 6603bf4b70SChuck Lever 6703bf4b70SChuck Lever /* 6803bf4b70SChuck Lever * Wait duration for a reply from the RPC portmapper. 6903bf4b70SChuck Lever */ 7003bf4b70SChuck Lever #define XS_BIND_TO (60U * HZ) 7103bf4b70SChuck Lever 7203bf4b70SChuck Lever /* 7303bf4b70SChuck Lever * Delay if a UDP socket connect error occurs. This is most likely some 7403bf4b70SChuck Lever * kind of resource problem on the local host. 7503bf4b70SChuck Lever */ 7603bf4b70SChuck Lever #define XS_UDP_REEST_TO (2U * HZ) 7703bf4b70SChuck Lever 7803bf4b70SChuck Lever /* 7903bf4b70SChuck Lever * The reestablish timeout allows clients to delay for a bit before attempting 8003bf4b70SChuck Lever * to reconnect to a server that just dropped our connection. 8103bf4b70SChuck Lever * 8203bf4b70SChuck Lever * We implement an exponential backoff when trying to reestablish a TCP 8303bf4b70SChuck Lever * transport connection with the server. Some servers like to drop a TCP 8403bf4b70SChuck Lever * connection when they are overworked, so we start with a short timeout and 8503bf4b70SChuck Lever * increase over time if the server is down or not responding. 8603bf4b70SChuck Lever */ 8703bf4b70SChuck Lever #define XS_TCP_INIT_REEST_TO (3U * HZ) 8803bf4b70SChuck Lever #define XS_TCP_MAX_REEST_TO (5U * 60 * HZ) 8903bf4b70SChuck Lever 9003bf4b70SChuck Lever /* 9103bf4b70SChuck Lever * TCP idle timeout; client drops the transport socket if it is idle 9203bf4b70SChuck Lever * for this long. Note that we also timeout UDP sockets to prevent 9303bf4b70SChuck Lever * holding port numbers when there is no RPC traffic. 9403bf4b70SChuck Lever */ 9503bf4b70SChuck Lever #define XS_IDLE_DISC_TO (5U * 60 * HZ) 9603bf4b70SChuck Lever 97a246b010SChuck Lever #ifdef RPC_DEBUG 98a246b010SChuck Lever # undef RPC_DEBUG_DATA 999903cd1cSChuck Lever # define RPCDBG_FACILITY RPCDBG_TRANS 100a246b010SChuck Lever #endif 101a246b010SChuck Lever 102a246b010SChuck Lever #ifdef RPC_DEBUG_DATA 1039903cd1cSChuck Lever static void xs_pktdump(char *msg, u32 *packet, unsigned int count) 104a246b010SChuck Lever { 105a246b010SChuck Lever u8 *buf = (u8 *) packet; 106a246b010SChuck Lever int j; 107a246b010SChuck Lever 108a246b010SChuck Lever dprintk("RPC: %s\n", msg); 109a246b010SChuck Lever for (j = 0; j < count && j < 128; j += 4) { 110a246b010SChuck Lever if (!(j & 31)) { 111a246b010SChuck Lever if (j) 112a246b010SChuck Lever dprintk("\n"); 113a246b010SChuck Lever dprintk("0x%04x ", j); 114a246b010SChuck Lever } 115a246b010SChuck Lever dprintk("%02x%02x%02x%02x ", 116a246b010SChuck Lever buf[j], buf[j+1], buf[j+2], buf[j+3]); 117a246b010SChuck Lever } 118a246b010SChuck Lever dprintk("\n"); 119a246b010SChuck Lever } 120a246b010SChuck Lever #else 1219903cd1cSChuck Lever static inline void xs_pktdump(char *msg, u32 *packet, unsigned int count) 122a246b010SChuck Lever { 123a246b010SChuck Lever /* NOP */ 124a246b010SChuck Lever } 125a246b010SChuck Lever #endif 126a246b010SChuck Lever 127b4b5cc85SChuck Lever #define XS_SENDMSG_FLAGS (MSG_DONTWAIT | MSG_NOSIGNAL) 128b4b5cc85SChuck Lever 129b4b5cc85SChuck Lever static inline int xs_send_head(struct socket *sock, struct sockaddr *addr, int addrlen, struct xdr_buf *xdr, unsigned int base, unsigned int len) 130b4b5cc85SChuck Lever { 131b4b5cc85SChuck Lever struct kvec iov = { 132b4b5cc85SChuck Lever .iov_base = xdr->head[0].iov_base + base, 133b4b5cc85SChuck Lever .iov_len = len - base, 134b4b5cc85SChuck Lever }; 135b4b5cc85SChuck Lever struct msghdr msg = { 136b4b5cc85SChuck Lever .msg_name = addr, 137b4b5cc85SChuck Lever .msg_namelen = addrlen, 138b4b5cc85SChuck Lever .msg_flags = XS_SENDMSG_FLAGS, 139b4b5cc85SChuck Lever }; 140b4b5cc85SChuck Lever 141b4b5cc85SChuck Lever if (xdr->len > len) 142b4b5cc85SChuck Lever msg.msg_flags |= MSG_MORE; 143b4b5cc85SChuck Lever 144b4b5cc85SChuck Lever if (likely(iov.iov_len)) 145b4b5cc85SChuck Lever return kernel_sendmsg(sock, &msg, &iov, 1, iov.iov_len); 146b4b5cc85SChuck Lever return kernel_sendmsg(sock, &msg, NULL, 0, 0); 147b4b5cc85SChuck Lever } 148b4b5cc85SChuck Lever 149b4b5cc85SChuck Lever static int xs_send_tail(struct socket *sock, struct xdr_buf *xdr, unsigned int base, unsigned int len) 150b4b5cc85SChuck Lever { 151b4b5cc85SChuck Lever struct kvec iov = { 152b4b5cc85SChuck Lever .iov_base = xdr->tail[0].iov_base + base, 153b4b5cc85SChuck Lever .iov_len = len - base, 154b4b5cc85SChuck Lever }; 155b4b5cc85SChuck Lever struct msghdr msg = { 156b4b5cc85SChuck Lever .msg_flags = XS_SENDMSG_FLAGS, 157b4b5cc85SChuck Lever }; 158b4b5cc85SChuck Lever 159b4b5cc85SChuck Lever return kernel_sendmsg(sock, &msg, &iov, 1, iov.iov_len); 160b4b5cc85SChuck Lever } 161b4b5cc85SChuck Lever 1629903cd1cSChuck Lever /** 1639903cd1cSChuck Lever * xs_sendpages - write pages directly to a socket 1649903cd1cSChuck Lever * @sock: socket to send on 1659903cd1cSChuck Lever * @addr: UDP only -- address of destination 1669903cd1cSChuck Lever * @addrlen: UDP only -- length of destination address 1679903cd1cSChuck Lever * @xdr: buffer containing this request 1689903cd1cSChuck Lever * @base: starting position in the buffer 1699903cd1cSChuck Lever * 170a246b010SChuck Lever */ 171262965f5SChuck Lever static inline int xs_sendpages(struct socket *sock, struct sockaddr *addr, int addrlen, struct xdr_buf *xdr, unsigned int base) 172a246b010SChuck Lever { 173a246b010SChuck Lever struct page **ppage = xdr->pages; 174a246b010SChuck Lever unsigned int len, pglen = xdr->page_len; 175a246b010SChuck Lever int err, ret = 0; 176a246b010SChuck Lever ssize_t (*sendpage)(struct socket *, struct page *, int, size_t, int); 177a246b010SChuck Lever 178262965f5SChuck Lever if (unlikely(!sock)) 179262965f5SChuck Lever return -ENOTCONN; 180262965f5SChuck Lever 181262965f5SChuck Lever clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags); 182262965f5SChuck Lever 183a246b010SChuck Lever len = xdr->head[0].iov_len; 184a246b010SChuck Lever if (base < len || (addr != NULL && base == 0)) { 185b4b5cc85SChuck Lever err = xs_send_head(sock, addr, addrlen, xdr, base, len); 186a246b010SChuck Lever if (ret == 0) 187a246b010SChuck Lever ret = err; 188a246b010SChuck Lever else if (err > 0) 189a246b010SChuck Lever ret += err; 190b4b5cc85SChuck Lever if (err != (len - base)) 191a246b010SChuck Lever goto out; 192a246b010SChuck Lever base = 0; 193a246b010SChuck Lever } else 194a246b010SChuck Lever base -= len; 195a246b010SChuck Lever 196b4b5cc85SChuck Lever if (unlikely(pglen == 0)) 197a246b010SChuck Lever goto copy_tail; 198b4b5cc85SChuck Lever if (unlikely(base >= pglen)) { 199a246b010SChuck Lever base -= pglen; 200a246b010SChuck Lever goto copy_tail; 201a246b010SChuck Lever } 202a246b010SChuck Lever if (base || xdr->page_base) { 203a246b010SChuck Lever pglen -= base; 204a246b010SChuck Lever base += xdr->page_base; 205a246b010SChuck Lever ppage += base >> PAGE_CACHE_SHIFT; 206a246b010SChuck Lever base &= ~PAGE_CACHE_MASK; 207a246b010SChuck Lever } 208a246b010SChuck Lever 209a246b010SChuck Lever sendpage = sock->ops->sendpage ? : sock_no_sendpage; 210a246b010SChuck Lever do { 211b4b5cc85SChuck Lever int flags = XS_SENDMSG_FLAGS; 212a246b010SChuck Lever 213a246b010SChuck Lever len = PAGE_CACHE_SIZE; 214a246b010SChuck Lever if (base) 215a246b010SChuck Lever len -= base; 216a246b010SChuck Lever if (pglen < len) 217a246b010SChuck Lever len = pglen; 218a246b010SChuck Lever 219a246b010SChuck Lever if (pglen != len || xdr->tail[0].iov_len != 0) 220a246b010SChuck Lever flags |= MSG_MORE; 221a246b010SChuck Lever 222a246b010SChuck Lever /* Hmm... We might be dealing with highmem pages */ 223a246b010SChuck Lever if (PageHighMem(*ppage)) 224a246b010SChuck Lever sendpage = sock_no_sendpage; 225a246b010SChuck Lever err = sendpage(sock, *ppage, base, len, flags); 226a246b010SChuck Lever if (ret == 0) 227a246b010SChuck Lever ret = err; 228a246b010SChuck Lever else if (err > 0) 229a246b010SChuck Lever ret += err; 230a246b010SChuck Lever if (err != len) 231a246b010SChuck Lever goto out; 232a246b010SChuck Lever base = 0; 233a246b010SChuck Lever ppage++; 234a246b010SChuck Lever } while ((pglen -= len) != 0); 235a246b010SChuck Lever copy_tail: 236a246b010SChuck Lever len = xdr->tail[0].iov_len; 237a246b010SChuck Lever if (base < len) { 238b4b5cc85SChuck Lever err = xs_send_tail(sock, xdr, base, len); 239a246b010SChuck Lever if (ret == 0) 240a246b010SChuck Lever ret = err; 241a246b010SChuck Lever else if (err > 0) 242a246b010SChuck Lever ret += err; 243a246b010SChuck Lever } 244a246b010SChuck Lever out: 245a246b010SChuck Lever return ret; 246a246b010SChuck Lever } 247a246b010SChuck Lever 2489903cd1cSChuck Lever /** 249262965f5SChuck Lever * xs_nospace - place task on wait queue if transmit was incomplete 250262965f5SChuck Lever * @task: task to put to sleep 2519903cd1cSChuck Lever * 252a246b010SChuck Lever */ 253262965f5SChuck Lever static void xs_nospace(struct rpc_task *task) 254a246b010SChuck Lever { 255262965f5SChuck Lever struct rpc_rqst *req = task->tk_rqstp; 256262965f5SChuck Lever struct rpc_xprt *xprt = req->rq_xprt; 257a246b010SChuck Lever 258262965f5SChuck Lever dprintk("RPC: %4d xmit incomplete (%u left of %u)\n", 259262965f5SChuck Lever task->tk_pid, req->rq_slen - req->rq_bytes_sent, 260262965f5SChuck Lever req->rq_slen); 261a246b010SChuck Lever 262262965f5SChuck Lever if (test_bit(SOCK_ASYNC_NOSPACE, &xprt->sock->flags)) { 263262965f5SChuck Lever /* Protect against races with write_space */ 264262965f5SChuck Lever spin_lock_bh(&xprt->transport_lock); 265a246b010SChuck Lever 266262965f5SChuck Lever /* Don't race with disconnect */ 267262965f5SChuck Lever if (!xprt_connected(xprt)) 268262965f5SChuck Lever task->tk_status = -ENOTCONN; 269262965f5SChuck Lever else if (test_bit(SOCK_NOSPACE, &xprt->sock->flags)) 270262965f5SChuck Lever xprt_wait_for_buffer_space(task); 271a246b010SChuck Lever 272262965f5SChuck Lever spin_unlock_bh(&xprt->transport_lock); 273262965f5SChuck Lever } else 274262965f5SChuck Lever /* Keep holding the socket if it is blocked */ 275262965f5SChuck Lever rpc_delay(task, HZ>>4); 276a246b010SChuck Lever } 277a246b010SChuck Lever 2789903cd1cSChuck Lever /** 279262965f5SChuck Lever * xs_udp_send_request - write an RPC request to a UDP socket 2809903cd1cSChuck Lever * @task: address of RPC task that manages the state of an RPC request 2819903cd1cSChuck Lever * 2829903cd1cSChuck Lever * Return values: 2839903cd1cSChuck Lever * 0: The request has been sent 2849903cd1cSChuck Lever * EAGAIN: The socket was blocked, please call again later to 2859903cd1cSChuck Lever * complete the request 286262965f5SChuck Lever * ENOTCONN: Caller needs to invoke connect logic then call again 2879903cd1cSChuck Lever * other: Some other error occured, the request was not sent 2889903cd1cSChuck Lever */ 289262965f5SChuck Lever static int xs_udp_send_request(struct rpc_task *task) 290a246b010SChuck Lever { 291a246b010SChuck Lever struct rpc_rqst *req = task->tk_rqstp; 292a246b010SChuck Lever struct rpc_xprt *xprt = req->rq_xprt; 293262965f5SChuck Lever struct xdr_buf *xdr = &req->rq_snd_buf; 294262965f5SChuck Lever int status; 295262965f5SChuck Lever 296262965f5SChuck Lever xs_pktdump("packet data:", 297262965f5SChuck Lever req->rq_svec->iov_base, 298262965f5SChuck Lever req->rq_svec->iov_len); 299262965f5SChuck Lever 300262965f5SChuck Lever req->rq_xtime = jiffies; 301262965f5SChuck Lever status = xs_sendpages(xprt->sock, (struct sockaddr *) &xprt->addr, 302262965f5SChuck Lever sizeof(xprt->addr), xdr, req->rq_bytes_sent); 303262965f5SChuck Lever 304262965f5SChuck Lever dprintk("RPC: xs_udp_send_request(%u) = %d\n", 305262965f5SChuck Lever xdr->len - req->rq_bytes_sent, status); 306262965f5SChuck Lever 307262965f5SChuck Lever if (likely(status >= (int) req->rq_slen)) 308262965f5SChuck Lever return 0; 309262965f5SChuck Lever 310262965f5SChuck Lever /* Still some bytes left; set up for a retry later. */ 311262965f5SChuck Lever if (status > 0) 312262965f5SChuck Lever status = -EAGAIN; 313262965f5SChuck Lever 314262965f5SChuck Lever switch (status) { 315262965f5SChuck Lever case -ENETUNREACH: 316262965f5SChuck Lever case -EPIPE: 317262965f5SChuck Lever case -ECONNREFUSED: 318262965f5SChuck Lever /* When the server has died, an ICMP port unreachable message 319262965f5SChuck Lever * prompts ECONNREFUSED. */ 320262965f5SChuck Lever break; 321262965f5SChuck Lever case -EAGAIN: 322262965f5SChuck Lever xs_nospace(task); 323262965f5SChuck Lever break; 324262965f5SChuck Lever default: 325262965f5SChuck Lever dprintk("RPC: sendmsg returned unrecognized error %d\n", 326262965f5SChuck Lever -status); 327262965f5SChuck Lever break; 328262965f5SChuck Lever } 329262965f5SChuck Lever 330262965f5SChuck Lever return status; 331262965f5SChuck Lever } 332262965f5SChuck Lever 333808012fbSChuck Lever static inline void xs_encode_tcp_record_marker(struct xdr_buf *buf) 334808012fbSChuck Lever { 335808012fbSChuck Lever u32 reclen = buf->len - sizeof(rpc_fraghdr); 336808012fbSChuck Lever rpc_fraghdr *base = buf->head[0].iov_base; 337808012fbSChuck Lever *base = htonl(RPC_LAST_STREAM_FRAGMENT | reclen); 338808012fbSChuck Lever } 339808012fbSChuck Lever 340262965f5SChuck Lever /** 341262965f5SChuck Lever * xs_tcp_send_request - write an RPC request to a TCP socket 342262965f5SChuck Lever * @task: address of RPC task that manages the state of an RPC request 343262965f5SChuck Lever * 344262965f5SChuck Lever * Return values: 345262965f5SChuck Lever * 0: The request has been sent 346262965f5SChuck Lever * EAGAIN: The socket was blocked, please call again later to 347262965f5SChuck Lever * complete the request 348262965f5SChuck Lever * ENOTCONN: Caller needs to invoke connect logic then call again 349262965f5SChuck Lever * other: Some other error occured, the request was not sent 350262965f5SChuck Lever * 351262965f5SChuck Lever * XXX: In the case of soft timeouts, should we eventually give up 352262965f5SChuck Lever * if sendmsg is not able to make progress? 353262965f5SChuck Lever */ 354262965f5SChuck Lever static int xs_tcp_send_request(struct rpc_task *task) 355262965f5SChuck Lever { 356262965f5SChuck Lever struct rpc_rqst *req = task->tk_rqstp; 357262965f5SChuck Lever struct rpc_xprt *xprt = req->rq_xprt; 358262965f5SChuck Lever struct xdr_buf *xdr = &req->rq_snd_buf; 359a246b010SChuck Lever int status, retry = 0; 360a246b010SChuck Lever 361808012fbSChuck Lever xs_encode_tcp_record_marker(&req->rq_snd_buf); 362262965f5SChuck Lever 363262965f5SChuck Lever xs_pktdump("packet data:", 364262965f5SChuck Lever req->rq_svec->iov_base, 365262965f5SChuck Lever req->rq_svec->iov_len); 366a246b010SChuck Lever 367a246b010SChuck Lever /* Continue transmitting the packet/record. We must be careful 368a246b010SChuck Lever * to cope with writespace callbacks arriving _after_ we have 369262965f5SChuck Lever * called sendmsg(). */ 370a246b010SChuck Lever while (1) { 371a246b010SChuck Lever req->rq_xtime = jiffies; 372262965f5SChuck Lever status = xs_sendpages(xprt->sock, NULL, 0, xdr, 373262965f5SChuck Lever req->rq_bytes_sent); 374a246b010SChuck Lever 375262965f5SChuck Lever dprintk("RPC: xs_tcp_send_request(%u) = %d\n", 376262965f5SChuck Lever xdr->len - req->rq_bytes_sent, status); 377262965f5SChuck Lever 378262965f5SChuck Lever if (unlikely(status < 0)) 379a246b010SChuck Lever break; 380a246b010SChuck Lever 381a246b010SChuck Lever /* If we've sent the entire packet, immediately 382a246b010SChuck Lever * reset the count of bytes sent. */ 383262965f5SChuck Lever req->rq_bytes_sent += status; 384262965f5SChuck Lever if (likely(req->rq_bytes_sent >= req->rq_slen)) { 385a246b010SChuck Lever req->rq_bytes_sent = 0; 386a246b010SChuck Lever return 0; 387a246b010SChuck Lever } 388262965f5SChuck Lever 389a246b010SChuck Lever status = -EAGAIN; 390262965f5SChuck Lever if (retry++ > XS_SENDMSG_RETRY) 391a246b010SChuck Lever break; 392a246b010SChuck Lever } 393a246b010SChuck Lever 394262965f5SChuck Lever switch (status) { 395262965f5SChuck Lever case -EAGAIN: 396262965f5SChuck Lever xs_nospace(task); 397262965f5SChuck Lever break; 398262965f5SChuck Lever case -ECONNREFUSED: 399262965f5SChuck Lever case -ECONNRESET: 400262965f5SChuck Lever case -ENOTCONN: 401262965f5SChuck Lever case -EPIPE: 402262965f5SChuck Lever status = -ENOTCONN; 403262965f5SChuck Lever break; 404262965f5SChuck Lever default: 405262965f5SChuck Lever dprintk("RPC: sendmsg returned unrecognized error %d\n", 406262965f5SChuck Lever -status); 40743118c29SChuck Lever xprt_disconnect(xprt); 408a246b010SChuck Lever break; 409a246b010SChuck Lever } 410a246b010SChuck Lever 411a246b010SChuck Lever return status; 412a246b010SChuck Lever } 413a246b010SChuck Lever 4149903cd1cSChuck Lever /** 4159903cd1cSChuck Lever * xs_close - close a socket 4169903cd1cSChuck Lever * @xprt: transport 4179903cd1cSChuck Lever * 4183167e12cSChuck Lever * This is used when all requests are complete; ie, no DRC state remains 4193167e12cSChuck Lever * on the server we want to save. 420a246b010SChuck Lever */ 4219903cd1cSChuck Lever static void xs_close(struct rpc_xprt *xprt) 422a246b010SChuck Lever { 423a246b010SChuck Lever struct socket *sock = xprt->sock; 424a246b010SChuck Lever struct sock *sk = xprt->inet; 425a246b010SChuck Lever 426a246b010SChuck Lever if (!sk) 427a246b010SChuck Lever return; 428a246b010SChuck Lever 4299903cd1cSChuck Lever dprintk("RPC: xs_close xprt %p\n", xprt); 4309903cd1cSChuck Lever 431a246b010SChuck Lever write_lock_bh(&sk->sk_callback_lock); 432a246b010SChuck Lever xprt->inet = NULL; 433a246b010SChuck Lever xprt->sock = NULL; 434a246b010SChuck Lever 435a246b010SChuck Lever sk->sk_user_data = NULL; 436a246b010SChuck Lever sk->sk_data_ready = xprt->old_data_ready; 437a246b010SChuck Lever sk->sk_state_change = xprt->old_state_change; 438a246b010SChuck Lever sk->sk_write_space = xprt->old_write_space; 439a246b010SChuck Lever write_unlock_bh(&sk->sk_callback_lock); 440a246b010SChuck Lever 441a246b010SChuck Lever sk->sk_no_check = 0; 442a246b010SChuck Lever 443a246b010SChuck Lever sock_release(sock); 444a246b010SChuck Lever } 445a246b010SChuck Lever 4469903cd1cSChuck Lever /** 4479903cd1cSChuck Lever * xs_destroy - prepare to shutdown a transport 4489903cd1cSChuck Lever * @xprt: doomed transport 4499903cd1cSChuck Lever * 4509903cd1cSChuck Lever */ 4519903cd1cSChuck Lever static void xs_destroy(struct rpc_xprt *xprt) 452a246b010SChuck Lever { 4539903cd1cSChuck Lever dprintk("RPC: xs_destroy xprt %p\n", xprt); 4549903cd1cSChuck Lever 45555aa4f58SChuck Lever cancel_delayed_work(&xprt->connect_worker); 456a246b010SChuck Lever flush_scheduled_work(); 457a246b010SChuck Lever 458a246b010SChuck Lever xprt_disconnect(xprt); 4599903cd1cSChuck Lever xs_close(xprt); 460a246b010SChuck Lever kfree(xprt->slot); 461a246b010SChuck Lever } 462a246b010SChuck Lever 4639903cd1cSChuck Lever static inline struct rpc_xprt *xprt_from_sock(struct sock *sk) 4649903cd1cSChuck Lever { 4659903cd1cSChuck Lever return (struct rpc_xprt *) sk->sk_user_data; 4669903cd1cSChuck Lever } 4679903cd1cSChuck Lever 4689903cd1cSChuck Lever /** 4699903cd1cSChuck Lever * xs_udp_data_ready - "data ready" callback for UDP sockets 4709903cd1cSChuck Lever * @sk: socket with data to read 4719903cd1cSChuck Lever * @len: how much data to read 4729903cd1cSChuck Lever * 473a246b010SChuck Lever */ 4749903cd1cSChuck Lever static void xs_udp_data_ready(struct sock *sk, int len) 475a246b010SChuck Lever { 476a246b010SChuck Lever struct rpc_task *task; 477a246b010SChuck Lever struct rpc_xprt *xprt; 478a246b010SChuck Lever struct rpc_rqst *rovr; 479a246b010SChuck Lever struct sk_buff *skb; 480a246b010SChuck Lever int err, repsize, copied; 481a246b010SChuck Lever u32 _xid, *xp; 482a246b010SChuck Lever 483a246b010SChuck Lever read_lock(&sk->sk_callback_lock); 4849903cd1cSChuck Lever dprintk("RPC: xs_udp_data_ready...\n"); 4859903cd1cSChuck Lever if (!(xprt = xprt_from_sock(sk))) 486a246b010SChuck Lever goto out; 487a246b010SChuck Lever 488a246b010SChuck Lever if ((skb = skb_recv_datagram(sk, 0, 1, &err)) == NULL) 489a246b010SChuck Lever goto out; 490a246b010SChuck Lever 491a246b010SChuck Lever if (xprt->shutdown) 492a246b010SChuck Lever goto dropit; 493a246b010SChuck Lever 494a246b010SChuck Lever repsize = skb->len - sizeof(struct udphdr); 495a246b010SChuck Lever if (repsize < 4) { 4969903cd1cSChuck Lever dprintk("RPC: impossible RPC reply size %d!\n", repsize); 497a246b010SChuck Lever goto dropit; 498a246b010SChuck Lever } 499a246b010SChuck Lever 500a246b010SChuck Lever /* Copy the XID from the skb... */ 501a246b010SChuck Lever xp = skb_header_pointer(skb, sizeof(struct udphdr), 502a246b010SChuck Lever sizeof(_xid), &_xid); 503a246b010SChuck Lever if (xp == NULL) 504a246b010SChuck Lever goto dropit; 505a246b010SChuck Lever 506a246b010SChuck Lever /* Look up and lock the request corresponding to the given XID */ 5074a0f8c04SChuck Lever spin_lock(&xprt->transport_lock); 508a246b010SChuck Lever rovr = xprt_lookup_rqst(xprt, *xp); 509a246b010SChuck Lever if (!rovr) 510a246b010SChuck Lever goto out_unlock; 511a246b010SChuck Lever task = rovr->rq_task; 512a246b010SChuck Lever 513a246b010SChuck Lever if ((copied = rovr->rq_private_buf.buflen) > repsize) 514a246b010SChuck Lever copied = repsize; 515a246b010SChuck Lever 516a246b010SChuck Lever /* Suck it into the iovec, verify checksum if not done by hw. */ 517a246b010SChuck Lever if (csum_partial_copy_to_xdr(&rovr->rq_private_buf, skb)) 518a246b010SChuck Lever goto out_unlock; 519a246b010SChuck Lever 520a246b010SChuck Lever /* Something worked... */ 521a246b010SChuck Lever dst_confirm(skb->dst); 522a246b010SChuck Lever 5231570c1e4SChuck Lever xprt_adjust_cwnd(task, copied); 5241570c1e4SChuck Lever xprt_update_rtt(task); 5251570c1e4SChuck Lever xprt_complete_rqst(task, copied); 526a246b010SChuck Lever 527a246b010SChuck Lever out_unlock: 5284a0f8c04SChuck Lever spin_unlock(&xprt->transport_lock); 529a246b010SChuck Lever dropit: 530a246b010SChuck Lever skb_free_datagram(sk, skb); 531a246b010SChuck Lever out: 532a246b010SChuck Lever read_unlock(&sk->sk_callback_lock); 533a246b010SChuck Lever } 534a246b010SChuck Lever 5359903cd1cSChuck Lever static inline size_t xs_tcp_copy_data(skb_reader_t *desc, void *p, size_t len) 536a246b010SChuck Lever { 537a246b010SChuck Lever if (len > desc->count) 538a246b010SChuck Lever len = desc->count; 539a246b010SChuck Lever if (skb_copy_bits(desc->skb, desc->offset, p, len)) { 540a246b010SChuck Lever dprintk("RPC: failed to copy %zu bytes from skb. %zu bytes remain\n", 541a246b010SChuck Lever len, desc->count); 542a246b010SChuck Lever return 0; 543a246b010SChuck Lever } 544a246b010SChuck Lever desc->offset += len; 545a246b010SChuck Lever desc->count -= len; 546a246b010SChuck Lever dprintk("RPC: copied %zu bytes from skb. %zu bytes remain\n", 547a246b010SChuck Lever len, desc->count); 548a246b010SChuck Lever return len; 549a246b010SChuck Lever } 550a246b010SChuck Lever 5519903cd1cSChuck Lever static inline void xs_tcp_read_fraghdr(struct rpc_xprt *xprt, skb_reader_t *desc) 552a246b010SChuck Lever { 553a246b010SChuck Lever size_t len, used; 554a246b010SChuck Lever char *p; 555a246b010SChuck Lever 556a246b010SChuck Lever p = ((char *) &xprt->tcp_recm) + xprt->tcp_offset; 557a246b010SChuck Lever len = sizeof(xprt->tcp_recm) - xprt->tcp_offset; 5589903cd1cSChuck Lever used = xs_tcp_copy_data(desc, p, len); 559a246b010SChuck Lever xprt->tcp_offset += used; 560a246b010SChuck Lever if (used != len) 561a246b010SChuck Lever return; 562808012fbSChuck Lever 563a246b010SChuck Lever xprt->tcp_reclen = ntohl(xprt->tcp_recm); 564808012fbSChuck Lever if (xprt->tcp_reclen & RPC_LAST_STREAM_FRAGMENT) 565a246b010SChuck Lever xprt->tcp_flags |= XPRT_LAST_FRAG; 566a246b010SChuck Lever else 567a246b010SChuck Lever xprt->tcp_flags &= ~XPRT_LAST_FRAG; 568808012fbSChuck Lever xprt->tcp_reclen &= RPC_FRAGMENT_SIZE_MASK; 569808012fbSChuck Lever 570a246b010SChuck Lever xprt->tcp_flags &= ~XPRT_COPY_RECM; 571a246b010SChuck Lever xprt->tcp_offset = 0; 572808012fbSChuck Lever 573a246b010SChuck Lever /* Sanity check of the record length */ 574808012fbSChuck Lever if (unlikely(xprt->tcp_reclen < 4)) { 5759903cd1cSChuck Lever dprintk("RPC: invalid TCP record fragment length\n"); 576a246b010SChuck Lever xprt_disconnect(xprt); 5779903cd1cSChuck Lever return; 578a246b010SChuck Lever } 579a246b010SChuck Lever dprintk("RPC: reading TCP record fragment of length %d\n", 580a246b010SChuck Lever xprt->tcp_reclen); 581a246b010SChuck Lever } 582a246b010SChuck Lever 5839903cd1cSChuck Lever static void xs_tcp_check_recm(struct rpc_xprt *xprt) 584a246b010SChuck Lever { 585a246b010SChuck Lever dprintk("RPC: xprt = %p, tcp_copied = %lu, tcp_offset = %u, tcp_reclen = %u, tcp_flags = %lx\n", 586a246b010SChuck Lever xprt, xprt->tcp_copied, xprt->tcp_offset, xprt->tcp_reclen, xprt->tcp_flags); 587a246b010SChuck Lever if (xprt->tcp_offset == xprt->tcp_reclen) { 588a246b010SChuck Lever xprt->tcp_flags |= XPRT_COPY_RECM; 589a246b010SChuck Lever xprt->tcp_offset = 0; 590a246b010SChuck Lever if (xprt->tcp_flags & XPRT_LAST_FRAG) { 591a246b010SChuck Lever xprt->tcp_flags &= ~XPRT_COPY_DATA; 592a246b010SChuck Lever xprt->tcp_flags |= XPRT_COPY_XID; 593a246b010SChuck Lever xprt->tcp_copied = 0; 594a246b010SChuck Lever } 595a246b010SChuck Lever } 596a246b010SChuck Lever } 597a246b010SChuck Lever 5989903cd1cSChuck Lever static inline void xs_tcp_read_xid(struct rpc_xprt *xprt, skb_reader_t *desc) 599a246b010SChuck Lever { 600a246b010SChuck Lever size_t len, used; 601a246b010SChuck Lever char *p; 602a246b010SChuck Lever 603a246b010SChuck Lever len = sizeof(xprt->tcp_xid) - xprt->tcp_offset; 604a246b010SChuck Lever dprintk("RPC: reading XID (%Zu bytes)\n", len); 605a246b010SChuck Lever p = ((char *) &xprt->tcp_xid) + xprt->tcp_offset; 6069903cd1cSChuck Lever used = xs_tcp_copy_data(desc, p, len); 607a246b010SChuck Lever xprt->tcp_offset += used; 608a246b010SChuck Lever if (used != len) 609a246b010SChuck Lever return; 610a246b010SChuck Lever xprt->tcp_flags &= ~XPRT_COPY_XID; 611a246b010SChuck Lever xprt->tcp_flags |= XPRT_COPY_DATA; 612a246b010SChuck Lever xprt->tcp_copied = 4; 613a246b010SChuck Lever dprintk("RPC: reading reply for XID %08x\n", 614a246b010SChuck Lever ntohl(xprt->tcp_xid)); 6159903cd1cSChuck Lever xs_tcp_check_recm(xprt); 616a246b010SChuck Lever } 617a246b010SChuck Lever 6189903cd1cSChuck Lever static inline void xs_tcp_read_request(struct rpc_xprt *xprt, skb_reader_t *desc) 619a246b010SChuck Lever { 620a246b010SChuck Lever struct rpc_rqst *req; 621a246b010SChuck Lever struct xdr_buf *rcvbuf; 622a246b010SChuck Lever size_t len; 623a246b010SChuck Lever ssize_t r; 624a246b010SChuck Lever 625a246b010SChuck Lever /* Find and lock the request corresponding to this xid */ 6264a0f8c04SChuck Lever spin_lock(&xprt->transport_lock); 627a246b010SChuck Lever req = xprt_lookup_rqst(xprt, xprt->tcp_xid); 628a246b010SChuck Lever if (!req) { 629a246b010SChuck Lever xprt->tcp_flags &= ~XPRT_COPY_DATA; 630a246b010SChuck Lever dprintk("RPC: XID %08x request not found!\n", 631a246b010SChuck Lever ntohl(xprt->tcp_xid)); 6324a0f8c04SChuck Lever spin_unlock(&xprt->transport_lock); 633a246b010SChuck Lever return; 634a246b010SChuck Lever } 635a246b010SChuck Lever 636a246b010SChuck Lever rcvbuf = &req->rq_private_buf; 637a246b010SChuck Lever len = desc->count; 638a246b010SChuck Lever if (len > xprt->tcp_reclen - xprt->tcp_offset) { 639a246b010SChuck Lever skb_reader_t my_desc; 640a246b010SChuck Lever 641a246b010SChuck Lever len = xprt->tcp_reclen - xprt->tcp_offset; 642a246b010SChuck Lever memcpy(&my_desc, desc, sizeof(my_desc)); 643a246b010SChuck Lever my_desc.count = len; 644a246b010SChuck Lever r = xdr_partial_copy_from_skb(rcvbuf, xprt->tcp_copied, 6459903cd1cSChuck Lever &my_desc, xs_tcp_copy_data); 646a246b010SChuck Lever desc->count -= r; 647a246b010SChuck Lever desc->offset += r; 648a246b010SChuck Lever } else 649a246b010SChuck Lever r = xdr_partial_copy_from_skb(rcvbuf, xprt->tcp_copied, 6509903cd1cSChuck Lever desc, xs_tcp_copy_data); 651a246b010SChuck Lever 652a246b010SChuck Lever if (r > 0) { 653a246b010SChuck Lever xprt->tcp_copied += r; 654a246b010SChuck Lever xprt->tcp_offset += r; 655a246b010SChuck Lever } 656a246b010SChuck Lever if (r != len) { 657a246b010SChuck Lever /* Error when copying to the receive buffer, 658a246b010SChuck Lever * usually because we weren't able to allocate 659a246b010SChuck Lever * additional buffer pages. All we can do now 660a246b010SChuck Lever * is turn off XPRT_COPY_DATA, so the request 661a246b010SChuck Lever * will not receive any additional updates, 662a246b010SChuck Lever * and time out. 663a246b010SChuck Lever * Any remaining data from this record will 664a246b010SChuck Lever * be discarded. 665a246b010SChuck Lever */ 666a246b010SChuck Lever xprt->tcp_flags &= ~XPRT_COPY_DATA; 667a246b010SChuck Lever dprintk("RPC: XID %08x truncated request\n", 668a246b010SChuck Lever ntohl(xprt->tcp_xid)); 669a246b010SChuck Lever dprintk("RPC: xprt = %p, tcp_copied = %lu, tcp_offset = %u, tcp_reclen = %u\n", 670a246b010SChuck Lever xprt, xprt->tcp_copied, xprt->tcp_offset, xprt->tcp_reclen); 671a246b010SChuck Lever goto out; 672a246b010SChuck Lever } 673a246b010SChuck Lever 674a246b010SChuck Lever dprintk("RPC: XID %08x read %Zd bytes\n", 675a246b010SChuck Lever ntohl(xprt->tcp_xid), r); 676a246b010SChuck Lever dprintk("RPC: xprt = %p, tcp_copied = %lu, tcp_offset = %u, tcp_reclen = %u\n", 677a246b010SChuck Lever xprt, xprt->tcp_copied, xprt->tcp_offset, xprt->tcp_reclen); 678a246b010SChuck Lever 679a246b010SChuck Lever if (xprt->tcp_copied == req->rq_private_buf.buflen) 680a246b010SChuck Lever xprt->tcp_flags &= ~XPRT_COPY_DATA; 681a246b010SChuck Lever else if (xprt->tcp_offset == xprt->tcp_reclen) { 682a246b010SChuck Lever if (xprt->tcp_flags & XPRT_LAST_FRAG) 683a246b010SChuck Lever xprt->tcp_flags &= ~XPRT_COPY_DATA; 684a246b010SChuck Lever } 685a246b010SChuck Lever 686a246b010SChuck Lever out: 6871570c1e4SChuck Lever if (!(xprt->tcp_flags & XPRT_COPY_DATA)) 6881570c1e4SChuck Lever xprt_complete_rqst(req->rq_task, xprt->tcp_copied); 6894a0f8c04SChuck Lever spin_unlock(&xprt->transport_lock); 6909903cd1cSChuck Lever xs_tcp_check_recm(xprt); 691a246b010SChuck Lever } 692a246b010SChuck Lever 6939903cd1cSChuck Lever static inline void xs_tcp_read_discard(struct rpc_xprt *xprt, skb_reader_t *desc) 694a246b010SChuck Lever { 695a246b010SChuck Lever size_t len; 696a246b010SChuck Lever 697a246b010SChuck Lever len = xprt->tcp_reclen - xprt->tcp_offset; 698a246b010SChuck Lever if (len > desc->count) 699a246b010SChuck Lever len = desc->count; 700a246b010SChuck Lever desc->count -= len; 701a246b010SChuck Lever desc->offset += len; 702a246b010SChuck Lever xprt->tcp_offset += len; 703a246b010SChuck Lever dprintk("RPC: discarded %Zu bytes\n", len); 7049903cd1cSChuck Lever xs_tcp_check_recm(xprt); 705a246b010SChuck Lever } 706a246b010SChuck Lever 7079903cd1cSChuck Lever static int xs_tcp_data_recv(read_descriptor_t *rd_desc, struct sk_buff *skb, unsigned int offset, size_t len) 708a246b010SChuck Lever { 709a246b010SChuck Lever struct rpc_xprt *xprt = rd_desc->arg.data; 710a246b010SChuck Lever skb_reader_t desc = { 711a246b010SChuck Lever .skb = skb, 712a246b010SChuck Lever .offset = offset, 713a246b010SChuck Lever .count = len, 714a246b010SChuck Lever .csum = 0 715a246b010SChuck Lever }; 716a246b010SChuck Lever 7179903cd1cSChuck Lever dprintk("RPC: xs_tcp_data_recv started\n"); 718a246b010SChuck Lever do { 719a246b010SChuck Lever /* Read in a new fragment marker if necessary */ 720a246b010SChuck Lever /* Can we ever really expect to get completely empty fragments? */ 721a246b010SChuck Lever if (xprt->tcp_flags & XPRT_COPY_RECM) { 7229903cd1cSChuck Lever xs_tcp_read_fraghdr(xprt, &desc); 723a246b010SChuck Lever continue; 724a246b010SChuck Lever } 725a246b010SChuck Lever /* Read in the xid if necessary */ 726a246b010SChuck Lever if (xprt->tcp_flags & XPRT_COPY_XID) { 7279903cd1cSChuck Lever xs_tcp_read_xid(xprt, &desc); 728a246b010SChuck Lever continue; 729a246b010SChuck Lever } 730a246b010SChuck Lever /* Read in the request data */ 731a246b010SChuck Lever if (xprt->tcp_flags & XPRT_COPY_DATA) { 7329903cd1cSChuck Lever xs_tcp_read_request(xprt, &desc); 733a246b010SChuck Lever continue; 734a246b010SChuck Lever } 735a246b010SChuck Lever /* Skip over any trailing bytes on short reads */ 7369903cd1cSChuck Lever xs_tcp_read_discard(xprt, &desc); 737a246b010SChuck Lever } while (desc.count); 7389903cd1cSChuck Lever dprintk("RPC: xs_tcp_data_recv done\n"); 739a246b010SChuck Lever return len - desc.count; 740a246b010SChuck Lever } 741a246b010SChuck Lever 7429903cd1cSChuck Lever /** 7439903cd1cSChuck Lever * xs_tcp_data_ready - "data ready" callback for TCP sockets 7449903cd1cSChuck Lever * @sk: socket with data to read 7459903cd1cSChuck Lever * @bytes: how much data to read 7469903cd1cSChuck Lever * 7479903cd1cSChuck Lever */ 7489903cd1cSChuck Lever static void xs_tcp_data_ready(struct sock *sk, int bytes) 749a246b010SChuck Lever { 750a246b010SChuck Lever struct rpc_xprt *xprt; 751a246b010SChuck Lever read_descriptor_t rd_desc; 752a246b010SChuck Lever 753a246b010SChuck Lever read_lock(&sk->sk_callback_lock); 7549903cd1cSChuck Lever dprintk("RPC: xs_tcp_data_ready...\n"); 7559903cd1cSChuck Lever if (!(xprt = xprt_from_sock(sk))) 756a246b010SChuck Lever goto out; 757a246b010SChuck Lever if (xprt->shutdown) 758a246b010SChuck Lever goto out; 759a246b010SChuck Lever 7609903cd1cSChuck Lever /* We use rd_desc to pass struct xprt to xs_tcp_data_recv */ 761a246b010SChuck Lever rd_desc.arg.data = xprt; 762a246b010SChuck Lever rd_desc.count = 65536; 7639903cd1cSChuck Lever tcp_read_sock(sk, &rd_desc, xs_tcp_data_recv); 764a246b010SChuck Lever out: 765a246b010SChuck Lever read_unlock(&sk->sk_callback_lock); 766a246b010SChuck Lever } 767a246b010SChuck Lever 7689903cd1cSChuck Lever /** 7699903cd1cSChuck Lever * xs_tcp_state_change - callback to handle TCP socket state changes 7709903cd1cSChuck Lever * @sk: socket whose state has changed 7719903cd1cSChuck Lever * 7729903cd1cSChuck Lever */ 7739903cd1cSChuck Lever static void xs_tcp_state_change(struct sock *sk) 774a246b010SChuck Lever { 775a246b010SChuck Lever struct rpc_xprt *xprt; 776a246b010SChuck Lever 777a246b010SChuck Lever read_lock(&sk->sk_callback_lock); 778a246b010SChuck Lever if (!(xprt = xprt_from_sock(sk))) 779a246b010SChuck Lever goto out; 7809903cd1cSChuck Lever dprintk("RPC: xs_tcp_state_change client %p...\n", xprt); 781a246b010SChuck Lever dprintk("RPC: state %x conn %d dead %d zapped %d\n", 782a246b010SChuck Lever sk->sk_state, xprt_connected(xprt), 783a246b010SChuck Lever sock_flag(sk, SOCK_DEAD), 784a246b010SChuck Lever sock_flag(sk, SOCK_ZAPPED)); 785a246b010SChuck Lever 786a246b010SChuck Lever switch (sk->sk_state) { 787a246b010SChuck Lever case TCP_ESTABLISHED: 7884a0f8c04SChuck Lever spin_lock_bh(&xprt->transport_lock); 789a246b010SChuck Lever if (!xprt_test_and_set_connected(xprt)) { 790a246b010SChuck Lever /* Reset TCP record info */ 791a246b010SChuck Lever xprt->tcp_offset = 0; 792a246b010SChuck Lever xprt->tcp_reclen = 0; 793a246b010SChuck Lever xprt->tcp_copied = 0; 794a246b010SChuck Lever xprt->tcp_flags = XPRT_COPY_RECM | XPRT_COPY_XID; 79503bf4b70SChuck Lever xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; 79644fbac22SChuck Lever xprt_wake_pending_tasks(xprt, 0); 797a246b010SChuck Lever } 7984a0f8c04SChuck Lever spin_unlock_bh(&xprt->transport_lock); 799a246b010SChuck Lever break; 800a246b010SChuck Lever case TCP_SYN_SENT: 801a246b010SChuck Lever case TCP_SYN_RECV: 802a246b010SChuck Lever break; 803a246b010SChuck Lever default: 804a246b010SChuck Lever xprt_disconnect(xprt); 805a246b010SChuck Lever break; 806a246b010SChuck Lever } 807a246b010SChuck Lever out: 808a246b010SChuck Lever read_unlock(&sk->sk_callback_lock); 809a246b010SChuck Lever } 810a246b010SChuck Lever 8119903cd1cSChuck Lever /** 812c7b2cae8SChuck Lever * xs_udp_write_space - callback invoked when socket buffer space 813c7b2cae8SChuck Lever * becomes available 8149903cd1cSChuck Lever * @sk: socket whose state has changed 8159903cd1cSChuck Lever * 816a246b010SChuck Lever * Called when more output buffer space is available for this socket. 817a246b010SChuck Lever * We try not to wake our writers until they can make "significant" 818c7b2cae8SChuck Lever * progress, otherwise we'll waste resources thrashing kernel_sendmsg 819a246b010SChuck Lever * with a bunch of small requests. 820a246b010SChuck Lever */ 821c7b2cae8SChuck Lever static void xs_udp_write_space(struct sock *sk) 822a246b010SChuck Lever { 823a246b010SChuck Lever read_lock(&sk->sk_callback_lock); 824c7b2cae8SChuck Lever 825c7b2cae8SChuck Lever /* from net/core/sock.c:sock_def_write_space */ 826c7b2cae8SChuck Lever if (sock_writeable(sk)) { 827c7b2cae8SChuck Lever struct socket *sock; 828c7b2cae8SChuck Lever struct rpc_xprt *xprt; 829c7b2cae8SChuck Lever 830c7b2cae8SChuck Lever if (unlikely(!(sock = sk->sk_socket))) 831a246b010SChuck Lever goto out; 832c7b2cae8SChuck Lever if (unlikely(!(xprt = xprt_from_sock(sk)))) 833c7b2cae8SChuck Lever goto out; 834c7b2cae8SChuck Lever if (unlikely(!test_and_clear_bit(SOCK_NOSPACE, &sock->flags))) 835a246b010SChuck Lever goto out; 836a246b010SChuck Lever 837c7b2cae8SChuck Lever xprt_write_space(xprt); 838a246b010SChuck Lever } 839a246b010SChuck Lever 840c7b2cae8SChuck Lever out: 841c7b2cae8SChuck Lever read_unlock(&sk->sk_callback_lock); 842c7b2cae8SChuck Lever } 843c7b2cae8SChuck Lever 844c7b2cae8SChuck Lever /** 845c7b2cae8SChuck Lever * xs_tcp_write_space - callback invoked when socket buffer space 846c7b2cae8SChuck Lever * becomes available 847c7b2cae8SChuck Lever * @sk: socket whose state has changed 848c7b2cae8SChuck Lever * 849c7b2cae8SChuck Lever * Called when more output buffer space is available for this socket. 850c7b2cae8SChuck Lever * We try not to wake our writers until they can make "significant" 851c7b2cae8SChuck Lever * progress, otherwise we'll waste resources thrashing kernel_sendmsg 852c7b2cae8SChuck Lever * with a bunch of small requests. 853c7b2cae8SChuck Lever */ 854c7b2cae8SChuck Lever static void xs_tcp_write_space(struct sock *sk) 855c7b2cae8SChuck Lever { 856c7b2cae8SChuck Lever read_lock(&sk->sk_callback_lock); 857c7b2cae8SChuck Lever 858c7b2cae8SChuck Lever /* from net/core/stream.c:sk_stream_write_space */ 859c7b2cae8SChuck Lever if (sk_stream_wspace(sk) >= sk_stream_min_wspace(sk)) { 860c7b2cae8SChuck Lever struct socket *sock; 861c7b2cae8SChuck Lever struct rpc_xprt *xprt; 862c7b2cae8SChuck Lever 863c7b2cae8SChuck Lever if (unlikely(!(sock = sk->sk_socket))) 864c7b2cae8SChuck Lever goto out; 865c7b2cae8SChuck Lever if (unlikely(!(xprt = xprt_from_sock(sk)))) 866c7b2cae8SChuck Lever goto out; 867c7b2cae8SChuck Lever if (unlikely(!test_and_clear_bit(SOCK_NOSPACE, &sock->flags))) 868a246b010SChuck Lever goto out; 869a246b010SChuck Lever 870c7b2cae8SChuck Lever xprt_write_space(xprt); 871c7b2cae8SChuck Lever } 872c7b2cae8SChuck Lever 873a246b010SChuck Lever out: 874a246b010SChuck Lever read_unlock(&sk->sk_callback_lock); 875a246b010SChuck Lever } 876a246b010SChuck Lever 877470056c2SChuck Lever static void xs_udp_do_set_buffer_size(struct rpc_xprt *xprt) 878a246b010SChuck Lever { 879a246b010SChuck Lever struct sock *sk = xprt->inet; 880a246b010SChuck Lever 881a246b010SChuck Lever if (xprt->rcvsize) { 882a246b010SChuck Lever sk->sk_userlocks |= SOCK_RCVBUF_LOCK; 883a246b010SChuck Lever sk->sk_rcvbuf = xprt->rcvsize * xprt->max_reqs * 2; 884a246b010SChuck Lever } 885a246b010SChuck Lever if (xprt->sndsize) { 886a246b010SChuck Lever sk->sk_userlocks |= SOCK_SNDBUF_LOCK; 887a246b010SChuck Lever sk->sk_sndbuf = xprt->sndsize * xprt->max_reqs * 2; 888a246b010SChuck Lever sk->sk_write_space(sk); 889a246b010SChuck Lever } 890a246b010SChuck Lever } 891a246b010SChuck Lever 89243118c29SChuck Lever /** 893470056c2SChuck Lever * xs_udp_set_buffer_size - set send and receive limits 89443118c29SChuck Lever * @xprt: generic transport 895470056c2SChuck Lever * @sndsize: requested size of send buffer, in bytes 896470056c2SChuck Lever * @rcvsize: requested size of receive buffer, in bytes 89743118c29SChuck Lever * 898470056c2SChuck Lever * Set socket send and receive buffer size limits. 89943118c29SChuck Lever */ 900470056c2SChuck Lever static void xs_udp_set_buffer_size(struct rpc_xprt *xprt, size_t sndsize, size_t rcvsize) 90143118c29SChuck Lever { 902470056c2SChuck Lever xprt->sndsize = 0; 903470056c2SChuck Lever if (sndsize) 904470056c2SChuck Lever xprt->sndsize = sndsize + 1024; 905470056c2SChuck Lever xprt->rcvsize = 0; 906470056c2SChuck Lever if (rcvsize) 907470056c2SChuck Lever xprt->rcvsize = rcvsize + 1024; 908470056c2SChuck Lever 909470056c2SChuck Lever xs_udp_do_set_buffer_size(xprt); 91043118c29SChuck Lever } 91143118c29SChuck Lever 91246c0ee8bSChuck Lever /** 91346c0ee8bSChuck Lever * xs_udp_timer - called when a retransmit timeout occurs on a UDP transport 91446c0ee8bSChuck Lever * @task: task that timed out 91546c0ee8bSChuck Lever * 91646c0ee8bSChuck Lever * Adjust the congestion window after a retransmit timeout has occurred. 91746c0ee8bSChuck Lever */ 91846c0ee8bSChuck Lever static void xs_udp_timer(struct rpc_task *task) 91946c0ee8bSChuck Lever { 92046c0ee8bSChuck Lever xprt_adjust_cwnd(task, -ETIMEDOUT); 92146c0ee8bSChuck Lever } 92246c0ee8bSChuck Lever 9239903cd1cSChuck Lever static int xs_bindresvport(struct rpc_xprt *xprt, struct socket *sock) 924a246b010SChuck Lever { 925a246b010SChuck Lever struct sockaddr_in myaddr = { 926a246b010SChuck Lever .sin_family = AF_INET, 927a246b010SChuck Lever }; 928529b33c6SChuck Lever int err; 929529b33c6SChuck Lever unsigned short port = xprt->port; 930a246b010SChuck Lever 931a246b010SChuck Lever do { 932a246b010SChuck Lever myaddr.sin_port = htons(port); 933a246b010SChuck Lever err = sock->ops->bind(sock, (struct sockaddr *) &myaddr, 934a246b010SChuck Lever sizeof(myaddr)); 935a246b010SChuck Lever if (err == 0) { 936a246b010SChuck Lever xprt->port = port; 9379903cd1cSChuck Lever dprintk("RPC: xs_bindresvport bound to port %u\n", 9389903cd1cSChuck Lever port); 939a246b010SChuck Lever return 0; 940a246b010SChuck Lever } 941529b33c6SChuck Lever if (port <= xprt_min_resvport) 942529b33c6SChuck Lever port = xprt_max_resvport; 943529b33c6SChuck Lever else 944529b33c6SChuck Lever port--; 945a246b010SChuck Lever } while (err == -EADDRINUSE && port != xprt->port); 946a246b010SChuck Lever 9479903cd1cSChuck Lever dprintk("RPC: can't bind to reserved port (%d).\n", -err); 948a246b010SChuck Lever return err; 949a246b010SChuck Lever } 950a246b010SChuck Lever 9519903cd1cSChuck Lever /** 952b0d93ad5SChuck Lever * xs_udp_connect_worker - set up a UDP socket 9539903cd1cSChuck Lever * @args: RPC transport to connect 9549903cd1cSChuck Lever * 9559903cd1cSChuck Lever * Invoked by a work queue tasklet. 956a246b010SChuck Lever */ 957b0d93ad5SChuck Lever static void xs_udp_connect_worker(void *args) 958a246b010SChuck Lever { 959a246b010SChuck Lever struct rpc_xprt *xprt = (struct rpc_xprt *) args; 960a246b010SChuck Lever struct socket *sock = xprt->sock; 961b0d93ad5SChuck Lever int err, status = -EIO; 962a246b010SChuck Lever 963a246b010SChuck Lever if (xprt->shutdown || xprt->addr.sin_port == 0) 964a246b010SChuck Lever goto out; 965a246b010SChuck Lever 966b0d93ad5SChuck Lever dprintk("RPC: xs_udp_connect_worker for xprt %p\n", xprt); 9679903cd1cSChuck Lever 968b0d93ad5SChuck Lever /* Start by resetting any existing state */ 9699903cd1cSChuck Lever xs_close(xprt); 970b0d93ad5SChuck Lever 971b0d93ad5SChuck Lever if ((err = sock_create_kern(PF_INET, SOCK_DGRAM, IPPROTO_UDP, &sock)) < 0) { 972b0d93ad5SChuck Lever dprintk("RPC: can't create UDP transport socket (%d).\n", -err); 973a246b010SChuck Lever goto out; 974a246b010SChuck Lever } 975a246b010SChuck Lever 976b0d93ad5SChuck Lever if (xprt->resvport && xs_bindresvport(xprt, sock) < 0) { 977b0d93ad5SChuck Lever sock_release(sock); 978b0d93ad5SChuck Lever goto out; 979b0d93ad5SChuck Lever } 980b0d93ad5SChuck Lever 981b0d93ad5SChuck Lever if (!xprt->inet) { 982b0d93ad5SChuck Lever struct sock *sk = sock->sk; 983b0d93ad5SChuck Lever 984b0d93ad5SChuck Lever write_lock_bh(&sk->sk_callback_lock); 985b0d93ad5SChuck Lever 986b0d93ad5SChuck Lever sk->sk_user_data = xprt; 987b0d93ad5SChuck Lever xprt->old_data_ready = sk->sk_data_ready; 988b0d93ad5SChuck Lever xprt->old_state_change = sk->sk_state_change; 989b0d93ad5SChuck Lever xprt->old_write_space = sk->sk_write_space; 990b0d93ad5SChuck Lever sk->sk_data_ready = xs_udp_data_ready; 991b0d93ad5SChuck Lever sk->sk_write_space = xs_udp_write_space; 992b0d93ad5SChuck Lever sk->sk_no_check = UDP_CSUM_NORCV; 993b0d93ad5SChuck Lever 994b0d93ad5SChuck Lever xprt_set_connected(xprt); 995b0d93ad5SChuck Lever 996b0d93ad5SChuck Lever /* Reset to new socket */ 997b0d93ad5SChuck Lever xprt->sock = sock; 998b0d93ad5SChuck Lever xprt->inet = sk; 999b0d93ad5SChuck Lever 1000b0d93ad5SChuck Lever write_unlock_bh(&sk->sk_callback_lock); 1001b0d93ad5SChuck Lever } 1002470056c2SChuck Lever xs_udp_do_set_buffer_size(xprt); 1003a246b010SChuck Lever status = 0; 1004b0d93ad5SChuck Lever out: 1005b0d93ad5SChuck Lever xprt_wake_pending_tasks(xprt, status); 1006b0d93ad5SChuck Lever xprt_clear_connecting(xprt); 1007b0d93ad5SChuck Lever } 1008b0d93ad5SChuck Lever 10093167e12cSChuck Lever /* 10103167e12cSChuck Lever * We need to preserve the port number so the reply cache on the server can 10113167e12cSChuck Lever * find our cached RPC replies when we get around to reconnecting. 10123167e12cSChuck Lever */ 10133167e12cSChuck Lever static void xs_tcp_reuse_connection(struct rpc_xprt *xprt) 10143167e12cSChuck Lever { 10153167e12cSChuck Lever int result; 10163167e12cSChuck Lever struct socket *sock = xprt->sock; 10173167e12cSChuck Lever struct sockaddr any; 10183167e12cSChuck Lever 10193167e12cSChuck Lever dprintk("RPC: disconnecting xprt %p to reuse port\n", xprt); 10203167e12cSChuck Lever 10213167e12cSChuck Lever /* 10223167e12cSChuck Lever * Disconnect the transport socket by doing a connect operation 10233167e12cSChuck Lever * with AF_UNSPEC. This should return immediately... 10243167e12cSChuck Lever */ 10253167e12cSChuck Lever memset(&any, 0, sizeof(any)); 10263167e12cSChuck Lever any.sa_family = AF_UNSPEC; 10273167e12cSChuck Lever result = sock->ops->connect(sock, &any, sizeof(any), 0); 10283167e12cSChuck Lever if (result) 10293167e12cSChuck Lever dprintk("RPC: AF_UNSPEC connect return code %d\n", 10303167e12cSChuck Lever result); 10313167e12cSChuck Lever } 10323167e12cSChuck Lever 1033b0d93ad5SChuck Lever /** 1034b0d93ad5SChuck Lever * xs_tcp_connect_worker - connect a TCP socket to a remote endpoint 1035b0d93ad5SChuck Lever * @args: RPC transport to connect 1036b0d93ad5SChuck Lever * 1037b0d93ad5SChuck Lever * Invoked by a work queue tasklet. 1038b0d93ad5SChuck Lever */ 1039b0d93ad5SChuck Lever static void xs_tcp_connect_worker(void *args) 1040b0d93ad5SChuck Lever { 1041b0d93ad5SChuck Lever struct rpc_xprt *xprt = (struct rpc_xprt *)args; 1042b0d93ad5SChuck Lever struct socket *sock = xprt->sock; 1043b0d93ad5SChuck Lever int err, status = -EIO; 1044b0d93ad5SChuck Lever 1045b0d93ad5SChuck Lever if (xprt->shutdown || xprt->addr.sin_port == 0) 1046a246b010SChuck Lever goto out; 1047a246b010SChuck Lever 1048b0d93ad5SChuck Lever dprintk("RPC: xs_tcp_connect_worker for xprt %p\n", xprt); 1049b0d93ad5SChuck Lever 10503167e12cSChuck Lever if (!xprt->sock) { 10513167e12cSChuck Lever /* start from scratch */ 1052b0d93ad5SChuck Lever if ((err = sock_create_kern(PF_INET, SOCK_STREAM, IPPROTO_TCP, &sock)) < 0) { 1053b0d93ad5SChuck Lever dprintk("RPC: can't create TCP transport socket (%d).\n", -err); 1054b0d93ad5SChuck Lever goto out; 1055b0d93ad5SChuck Lever } 1056b0d93ad5SChuck Lever 1057b0d93ad5SChuck Lever if (xprt->resvport && xs_bindresvport(xprt, sock) < 0) { 1058b0d93ad5SChuck Lever sock_release(sock); 1059b0d93ad5SChuck Lever goto out; 1060b0d93ad5SChuck Lever } 10613167e12cSChuck Lever } else 10623167e12cSChuck Lever /* "close" the socket, preserving the local port */ 10633167e12cSChuck Lever xs_tcp_reuse_connection(xprt); 1064b0d93ad5SChuck Lever 1065b0d93ad5SChuck Lever if (!xprt->inet) { 1066b0d93ad5SChuck Lever struct sock *sk = sock->sk; 1067b0d93ad5SChuck Lever 1068b0d93ad5SChuck Lever write_lock_bh(&sk->sk_callback_lock); 1069b0d93ad5SChuck Lever 1070b0d93ad5SChuck Lever sk->sk_user_data = xprt; 1071b0d93ad5SChuck Lever xprt->old_data_ready = sk->sk_data_ready; 1072b0d93ad5SChuck Lever xprt->old_state_change = sk->sk_state_change; 1073b0d93ad5SChuck Lever xprt->old_write_space = sk->sk_write_space; 1074b0d93ad5SChuck Lever sk->sk_data_ready = xs_tcp_data_ready; 1075b0d93ad5SChuck Lever sk->sk_state_change = xs_tcp_state_change; 1076b0d93ad5SChuck Lever sk->sk_write_space = xs_tcp_write_space; 10773167e12cSChuck Lever 10783167e12cSChuck Lever /* socket options */ 10793167e12cSChuck Lever sk->sk_userlocks |= SOCK_BINDPORT_LOCK; 10803167e12cSChuck Lever sock_reset_flag(sk, SOCK_LINGER); 10813167e12cSChuck Lever tcp_sk(sk)->linger2 = 0; 10823167e12cSChuck Lever tcp_sk(sk)->nonagle |= TCP_NAGLE_OFF; 1083b0d93ad5SChuck Lever 1084b0d93ad5SChuck Lever xprt_clear_connected(xprt); 1085b0d93ad5SChuck Lever 1086b0d93ad5SChuck Lever /* Reset to new socket */ 1087b0d93ad5SChuck Lever xprt->sock = sock; 1088b0d93ad5SChuck Lever xprt->inet = sk; 1089b0d93ad5SChuck Lever 1090b0d93ad5SChuck Lever write_unlock_bh(&sk->sk_callback_lock); 1091b0d93ad5SChuck Lever } 1092b0d93ad5SChuck Lever 1093b0d93ad5SChuck Lever /* Tell the socket layer to start connecting... */ 1094a246b010SChuck Lever status = sock->ops->connect(sock, (struct sockaddr *) &xprt->addr, 1095a246b010SChuck Lever sizeof(xprt->addr), O_NONBLOCK); 1096a246b010SChuck Lever dprintk("RPC: %p connect status %d connected %d sock state %d\n", 1097a246b010SChuck Lever xprt, -status, xprt_connected(xprt), sock->sk->sk_state); 1098a246b010SChuck Lever if (status < 0) { 1099a246b010SChuck Lever switch (status) { 1100a246b010SChuck Lever case -EINPROGRESS: 1101a246b010SChuck Lever case -EALREADY: 1102a246b010SChuck Lever goto out_clear; 11033167e12cSChuck Lever case -ECONNREFUSED: 11043167e12cSChuck Lever case -ECONNRESET: 11053167e12cSChuck Lever /* retry with existing socket, after a delay */ 11063167e12cSChuck Lever break; 11073167e12cSChuck Lever default: 11083167e12cSChuck Lever /* get rid of existing socket, and retry */ 11093167e12cSChuck Lever xs_close(xprt); 11103167e12cSChuck Lever break; 1111a246b010SChuck Lever } 1112a246b010SChuck Lever } 1113a246b010SChuck Lever out: 111444fbac22SChuck Lever xprt_wake_pending_tasks(xprt, status); 1115a246b010SChuck Lever out_clear: 11162226feb6SChuck Lever xprt_clear_connecting(xprt); 1117a246b010SChuck Lever } 1118a246b010SChuck Lever 11199903cd1cSChuck Lever /** 11209903cd1cSChuck Lever * xs_connect - connect a socket to a remote endpoint 11219903cd1cSChuck Lever * @task: address of RPC task that manages state of connect request 11229903cd1cSChuck Lever * 11239903cd1cSChuck Lever * TCP: If the remote end dropped the connection, delay reconnecting. 112403bf4b70SChuck Lever * 112503bf4b70SChuck Lever * UDP socket connects are synchronous, but we use a work queue anyway 112603bf4b70SChuck Lever * to guarantee that even unprivileged user processes can set up a 112703bf4b70SChuck Lever * socket on a privileged port. 112803bf4b70SChuck Lever * 112903bf4b70SChuck Lever * If a UDP socket connect fails, the delay behavior here prevents 113003bf4b70SChuck Lever * retry floods (hard mounts). 11319903cd1cSChuck Lever */ 11329903cd1cSChuck Lever static void xs_connect(struct rpc_task *task) 1133a246b010SChuck Lever { 1134a246b010SChuck Lever struct rpc_xprt *xprt = task->tk_xprt; 1135a246b010SChuck Lever 1136b0d93ad5SChuck Lever if (xprt_test_and_set_connecting(xprt)) 1137b0d93ad5SChuck Lever return; 1138b0d93ad5SChuck Lever 11399903cd1cSChuck Lever if (xprt->sock != NULL) { 114003bf4b70SChuck Lever dprintk("RPC: xs_connect delayed xprt %p for %lu seconds\n", 114103bf4b70SChuck Lever xprt, xprt->reestablish_timeout / HZ); 114255aa4f58SChuck Lever schedule_delayed_work(&xprt->connect_worker, 114303bf4b70SChuck Lever xprt->reestablish_timeout); 114403bf4b70SChuck Lever xprt->reestablish_timeout <<= 1; 114503bf4b70SChuck Lever if (xprt->reestablish_timeout > XS_TCP_MAX_REEST_TO) 114603bf4b70SChuck Lever xprt->reestablish_timeout = XS_TCP_MAX_REEST_TO; 11479903cd1cSChuck Lever } else { 11489903cd1cSChuck Lever dprintk("RPC: xs_connect scheduled xprt %p\n", xprt); 114955aa4f58SChuck Lever schedule_work(&xprt->connect_worker); 1150b0d93ad5SChuck Lever 1151a246b010SChuck Lever /* flush_scheduled_work can sleep... */ 1152a246b010SChuck Lever if (!RPC_IS_ASYNC(task)) 1153a246b010SChuck Lever flush_scheduled_work(); 1154a246b010SChuck Lever } 1155a246b010SChuck Lever } 1156a246b010SChuck Lever 1157262965f5SChuck Lever static struct rpc_xprt_ops xs_udp_ops = { 115843118c29SChuck Lever .set_buffer_size = xs_udp_set_buffer_size, 115912a80469SChuck Lever .reserve_xprt = xprt_reserve_xprt_cong, 116049e9a890SChuck Lever .release_xprt = xprt_release_xprt_cong, 11619903cd1cSChuck Lever .connect = xs_connect, 1162262965f5SChuck Lever .send_request = xs_udp_send_request, 1163fe3aca29SChuck Lever .set_retrans_timeout = xprt_set_retrans_timeout_rtt, 116446c0ee8bSChuck Lever .timer = xs_udp_timer, 1165a58dd398SChuck Lever .release_request = xprt_release_rqst_cong, 1166262965f5SChuck Lever .close = xs_close, 1167262965f5SChuck Lever .destroy = xs_destroy, 1168262965f5SChuck Lever }; 1169262965f5SChuck Lever 1170262965f5SChuck Lever static struct rpc_xprt_ops xs_tcp_ops = { 117112a80469SChuck Lever .reserve_xprt = xprt_reserve_xprt, 117249e9a890SChuck Lever .release_xprt = xprt_release_xprt, 1173262965f5SChuck Lever .connect = xs_connect, 1174262965f5SChuck Lever .send_request = xs_tcp_send_request, 1175fe3aca29SChuck Lever .set_retrans_timeout = xprt_set_retrans_timeout_def, 11769903cd1cSChuck Lever .close = xs_close, 11779903cd1cSChuck Lever .destroy = xs_destroy, 1178a246b010SChuck Lever }; 1179a246b010SChuck Lever 11809903cd1cSChuck Lever /** 11819903cd1cSChuck Lever * xs_setup_udp - Set up transport to use a UDP socket 11829903cd1cSChuck Lever * @xprt: transport to set up 11839903cd1cSChuck Lever * @to: timeout parameters 11849903cd1cSChuck Lever * 11859903cd1cSChuck Lever */ 1186a246b010SChuck Lever int xs_setup_udp(struct rpc_xprt *xprt, struct rpc_timeout *to) 1187a246b010SChuck Lever { 1188a246b010SChuck Lever size_t slot_table_size; 1189a246b010SChuck Lever 1190a246b010SChuck Lever dprintk("RPC: setting up udp-ipv4 transport...\n"); 1191a246b010SChuck Lever 1192a246b010SChuck Lever xprt->max_reqs = xprt_udp_slot_table_entries; 1193a246b010SChuck Lever slot_table_size = xprt->max_reqs * sizeof(xprt->slot[0]); 1194a246b010SChuck Lever xprt->slot = kmalloc(slot_table_size, GFP_KERNEL); 1195a246b010SChuck Lever if (xprt->slot == NULL) 1196a246b010SChuck Lever return -ENOMEM; 1197a246b010SChuck Lever memset(xprt->slot, 0, slot_table_size); 1198a246b010SChuck Lever 1199a246b010SChuck Lever xprt->prot = IPPROTO_UDP; 1200529b33c6SChuck Lever xprt->port = xprt_max_resvport; 1201808012fbSChuck Lever xprt->tsh_size = 0; 1202a246b010SChuck Lever xprt->resvport = capable(CAP_NET_BIND_SERVICE) ? 1 : 0; 1203a246b010SChuck Lever /* XXX: header size can vary due to auth type, IPv6, etc. */ 1204a246b010SChuck Lever xprt->max_payload = (1U << 16) - (MAX_HEADER << 3); 1205a246b010SChuck Lever 1206b0d93ad5SChuck Lever INIT_WORK(&xprt->connect_worker, xs_udp_connect_worker, xprt); 120703bf4b70SChuck Lever xprt->bind_timeout = XS_BIND_TO; 120803bf4b70SChuck Lever xprt->connect_timeout = XS_UDP_CONN_TO; 120903bf4b70SChuck Lever xprt->reestablish_timeout = XS_UDP_REEST_TO; 121003bf4b70SChuck Lever xprt->idle_timeout = XS_IDLE_DISC_TO; 1211a246b010SChuck Lever 1212262965f5SChuck Lever xprt->ops = &xs_udp_ops; 1213a246b010SChuck Lever 1214a246b010SChuck Lever if (to) 1215a246b010SChuck Lever xprt->timeout = *to; 1216a246b010SChuck Lever else 12179903cd1cSChuck Lever xprt_set_timeout(&xprt->timeout, 5, 5 * HZ); 1218a246b010SChuck Lever 1219a246b010SChuck Lever return 0; 1220a246b010SChuck Lever } 1221a246b010SChuck Lever 12229903cd1cSChuck Lever /** 12239903cd1cSChuck Lever * xs_setup_tcp - Set up transport to use a TCP socket 12249903cd1cSChuck Lever * @xprt: transport to set up 12259903cd1cSChuck Lever * @to: timeout parameters 12269903cd1cSChuck Lever * 12279903cd1cSChuck Lever */ 1228a246b010SChuck Lever int xs_setup_tcp(struct rpc_xprt *xprt, struct rpc_timeout *to) 1229a246b010SChuck Lever { 1230a246b010SChuck Lever size_t slot_table_size; 1231a246b010SChuck Lever 1232a246b010SChuck Lever dprintk("RPC: setting up tcp-ipv4 transport...\n"); 1233a246b010SChuck Lever 1234a246b010SChuck Lever xprt->max_reqs = xprt_tcp_slot_table_entries; 1235a246b010SChuck Lever slot_table_size = xprt->max_reqs * sizeof(xprt->slot[0]); 1236a246b010SChuck Lever xprt->slot = kmalloc(slot_table_size, GFP_KERNEL); 1237a246b010SChuck Lever if (xprt->slot == NULL) 1238a246b010SChuck Lever return -ENOMEM; 1239a246b010SChuck Lever memset(xprt->slot, 0, slot_table_size); 1240a246b010SChuck Lever 1241a246b010SChuck Lever xprt->prot = IPPROTO_TCP; 1242529b33c6SChuck Lever xprt->port = xprt_max_resvport; 1243808012fbSChuck Lever xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32); 1244a246b010SChuck Lever xprt->resvport = capable(CAP_NET_BIND_SERVICE) ? 1 : 0; 1245808012fbSChuck Lever xprt->max_payload = RPC_MAX_FRAGMENT_SIZE; 1246a246b010SChuck Lever 1247b0d93ad5SChuck Lever INIT_WORK(&xprt->connect_worker, xs_tcp_connect_worker, xprt); 124803bf4b70SChuck Lever xprt->bind_timeout = XS_BIND_TO; 124903bf4b70SChuck Lever xprt->connect_timeout = XS_TCP_CONN_TO; 125003bf4b70SChuck Lever xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; 125103bf4b70SChuck Lever xprt->idle_timeout = XS_IDLE_DISC_TO; 1252a246b010SChuck Lever 1253262965f5SChuck Lever xprt->ops = &xs_tcp_ops; 1254a246b010SChuck Lever 1255a246b010SChuck Lever if (to) 1256a246b010SChuck Lever xprt->timeout = *to; 1257a246b010SChuck Lever else 12589903cd1cSChuck Lever xprt_set_timeout(&xprt->timeout, 2, 60 * HZ); 1259a246b010SChuck Lever 1260a246b010SChuck Lever return 0; 1261a246b010SChuck Lever } 1262