diff options
Diffstat (limited to 'net/sunrpc/xprtsock.c')
| -rw-r--r-- | net/sunrpc/xprtsock.c | 2925 |
1 files changed, 2399 insertions, 526 deletions
diff --git a/net/sunrpc/xprtsock.c b/net/sunrpc/xprtsock.c index 2e1529217e6..be8bbd5d65e 100644 --- a/net/sunrpc/xprtsock.c +++ b/net/sunrpc/xprtsock.c @@ -3,8 +3,8 @@ * * Client-side transport implementation for sockets. * - * TCP callback races fixes (C) 1998 Red Hat Software <alan@redhat.com> - * TCP send fixes (C) 1998 Red Hat Software <alan@redhat.com> + * TCP callback races fixes (C) 1998 Red Hat + * TCP send fixes (C) 1998 Red Hat * TCP NFS related read + write fixes * (C) 1999 Dave Airlie, University of Limerick, Ireland <airlied@linux.ie> * @@ -13,47 +13,148 @@ * (C) 1999 Trond Myklebust <trond.myklebust@fys.uio.no> * * IP socket transport implementation, (C) 2005 Chuck Lever <cel@netapp.com> + * + * IPv6 support contributed by Gilles Quillard, Bull Open Source, 2005. + * <gilles.quillard@bull.net> */ #include <linux/types.h> +#include <linux/string.h> #include <linux/slab.h> +#include <linux/module.h> #include <linux/capability.h> -#include <linux/sched.h> #include <linux/pagemap.h> #include <linux/errno.h> #include <linux/socket.h> #include <linux/in.h> #include <linux/net.h> #include <linux/mm.h> +#include <linux/un.h> #include <linux/udp.h> #include <linux/tcp.h> #include <linux/sunrpc/clnt.h> +#include <linux/sunrpc/addr.h> +#include <linux/sunrpc/sched.h> +#include <linux/sunrpc/svcsock.h> +#include <linux/sunrpc/xprtsock.h> #include <linux/file.h> +#ifdef CONFIG_SUNRPC_BACKCHANNEL +#include <linux/sunrpc/bc_xprt.h> +#endif #include <net/sock.h> #include <net/checksum.h> #include <net/udp.h> #include <net/tcp.h> +#include <trace/events/sunrpc.h> + +#include "sunrpc.h" + +static void xs_close(struct rpc_xprt *xprt); + /* - * How many times to try sending a request on a socket before waiting - * for the socket buffer to clear. + * xprtsock tunables */ -#define XS_SENDMSG_RETRY (10U) +static unsigned int xprt_udp_slot_table_entries = RPC_DEF_SLOT_TABLE; +static unsigned int xprt_tcp_slot_table_entries = RPC_MIN_SLOT_TABLE; +static unsigned int xprt_max_tcp_slot_table_entries = RPC_MAX_SLOT_TABLE; + +static unsigned int xprt_min_resvport = RPC_DEF_MIN_RESVPORT; +static unsigned int xprt_max_resvport = RPC_DEF_MAX_RESVPORT; + +#define XS_TCP_LINGER_TO (15U * HZ) +static unsigned int xs_tcp_fin_timeout __read_mostly = XS_TCP_LINGER_TO; /* - * Time out for an RPC UDP socket connect. UDP socket connects are - * synchronous, but we set a timeout anyway in case of resource - * exhaustion on the local host. + * We can register our own files under /proc/sys/sunrpc by + * calling register_sysctl_table() again. The files in that + * directory become the union of all files registered there. + * + * We simply need to make sure that we don't collide with + * someone else's file names! */ -#define XS_UDP_CONN_TO (5U * HZ) + +#ifdef RPC_DEBUG + +static unsigned int min_slot_table_size = RPC_MIN_SLOT_TABLE; +static unsigned int max_slot_table_size = RPC_MAX_SLOT_TABLE; +static unsigned int max_tcp_slot_table_limit = RPC_MAX_SLOT_TABLE_LIMIT; +static unsigned int xprt_min_resvport_limit = RPC_MIN_RESVPORT; +static unsigned int xprt_max_resvport_limit = RPC_MAX_RESVPORT; + +static struct ctl_table_header *sunrpc_table_header; /* - * Wait duration for an RPC TCP connection to be established. Solaris - * NFS over TCP uses 60 seconds, for example, which is in line with how - * long a server takes to reboot. + * FIXME: changing the UDP slot table size should also resize the UDP + * socket buffers for existing UDP transports */ -#define XS_TCP_CONN_TO (60U * HZ) +static struct ctl_table xs_tunables_table[] = { + { + .procname = "udp_slot_table_entries", + .data = &xprt_udp_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 = "tcp_slot_table_entries", + .data = &xprt_tcp_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 = "tcp_max_slot_table_entries", + .data = &xprt_max_tcp_slot_table_entries, + .maxlen = sizeof(unsigned int), + .mode = 0644, + .proc_handler = proc_dointvec_minmax, + .extra1 = &min_slot_table_size, + .extra2 = &max_tcp_slot_table_limit + }, + { + .procname = "min_resvport", + .data = &xprt_min_resvport, + .maxlen = sizeof(unsigned int), + .mode = 0644, + .proc_handler = proc_dointvec_minmax, + .extra1 = &xprt_min_resvport_limit, + .extra2 = &xprt_max_resvport_limit + }, + { + .procname = "max_resvport", + .data = &xprt_max_resvport, + .maxlen = sizeof(unsigned int), + .mode = 0644, + .proc_handler = proc_dointvec_minmax, + .extra1 = &xprt_min_resvport_limit, + .extra2 = &xprt_max_resvport_limit + }, + { + .procname = "tcp_fin_timeout", + .data = &xs_tcp_fin_timeout, + .maxlen = sizeof(xs_tcp_fin_timeout), + .mode = 0644, + .proc_handler = proc_dointvec_jiffies, + }, + { }, +}; + +static struct ctl_table sunrpc_table[] = { + { + .procname = "sunrpc", + .mode = 0555, + .child = xs_tunables_table + }, + { }, +}; + +#endif /* * Wait duration for a reply from the RPC portmapper. @@ -96,7 +197,7 @@ static void xs_pktdump(char *msg, u32 *packet, unsigned int count) u8 *buf = (u8 *) packet; int j; - dprintk("RPC: %s\n", msg); + dprintk("RPC: %s\n", msg); for (j = 0; j < count && j < 128; j += 4) { if (!(j & 31)) { if (j) @@ -115,39 +216,223 @@ static inline void xs_pktdump(char *msg, u32 *packet, unsigned int count) } #endif +struct sock_xprt { + struct rpc_xprt xprt; + + /* + * Network layer + */ + struct socket * sock; + struct sock * inet; + + /* + * State of TCP reply receive + */ + __be32 tcp_fraghdr, + tcp_xid, + tcp_calldir; + + u32 tcp_offset, + tcp_reclen; + + unsigned long tcp_copied, + tcp_flags; + + /* + * Connection of transports + */ + struct delayed_work connect_worker; + struct sockaddr_storage srcaddr; + unsigned short srcport; + + /* + * UDP socket buffer size parameters + */ + size_t rcvsize, + sndsize; + + /* + * Saved socket callback addresses + */ + void (*old_data_ready)(struct sock *); + void (*old_state_change)(struct sock *); + void (*old_write_space)(struct sock *); + void (*old_error_report)(struct sock *); +}; + +/* + * TCP receive state flags + */ +#define TCP_RCV_LAST_FRAG (1UL << 0) +#define TCP_RCV_COPY_FRAGHDR (1UL << 1) +#define TCP_RCV_COPY_XID (1UL << 2) +#define TCP_RCV_COPY_DATA (1UL << 3) +#define TCP_RCV_READ_CALLDIR (1UL << 4) +#define TCP_RCV_COPY_CALLDIR (1UL << 5) + +/* + * TCP RPC flags + */ +#define TCP_RPC_REPLY (1UL << 6) + +static inline struct rpc_xprt *xprt_from_sock(struct sock *sk) +{ + return (struct rpc_xprt *) sk->sk_user_data; +} + +static inline struct sockaddr *xs_addr(struct rpc_xprt *xprt) +{ + return (struct sockaddr *) &xprt->addr; +} + +static inline struct sockaddr_un *xs_addr_un(struct rpc_xprt *xprt) +{ + return (struct sockaddr_un *) &xprt->addr; +} + +static inline struct sockaddr_in *xs_addr_in(struct rpc_xprt *xprt) +{ + return (struct sockaddr_in *) &xprt->addr; +} + +static inline struct sockaddr_in6 *xs_addr_in6(struct rpc_xprt *xprt) +{ + return (struct sockaddr_in6 *) &xprt->addr; +} + +static void xs_format_common_peer_addresses(struct rpc_xprt *xprt) +{ + struct sockaddr *sap = xs_addr(xprt); + struct sockaddr_in6 *sin6; + struct sockaddr_in *sin; + struct sockaddr_un *sun; + char buf[128]; + + switch (sap->sa_family) { + case AF_LOCAL: + sun = xs_addr_un(xprt); + strlcpy(buf, sun->sun_path, sizeof(buf)); + xprt->address_strings[RPC_DISPLAY_ADDR] = + kstrdup(buf, GFP_KERNEL); + break; + case AF_INET: + (void)rpc_ntop(sap, buf, sizeof(buf)); + xprt->address_strings[RPC_DISPLAY_ADDR] = + kstrdup(buf, GFP_KERNEL); + sin = xs_addr_in(xprt); + snprintf(buf, sizeof(buf), "%08x", ntohl(sin->sin_addr.s_addr)); + break; + case AF_INET6: + (void)rpc_ntop(sap, buf, sizeof(buf)); + xprt->address_strings[RPC_DISPLAY_ADDR] = + kstrdup(buf, GFP_KERNEL); + sin6 = xs_addr_in6(xprt); + snprintf(buf, sizeof(buf), "%pi6", &sin6->sin6_addr); + break; + default: + BUG(); + } + + xprt->address_strings[RPC_DISPLAY_HEX_ADDR] = kstrdup(buf, GFP_KERNEL); +} + +static void xs_format_common_peer_ports(struct rpc_xprt *xprt) +{ + struct sockaddr *sap = xs_addr(xprt); + char buf[128]; + + snprintf(buf, sizeof(buf), "%u", rpc_get_port(sap)); + xprt->address_strings[RPC_DISPLAY_PORT] = kstrdup(buf, GFP_KERNEL); + + snprintf(buf, sizeof(buf), "%4hx", rpc_get_port(sap)); + xprt->address_strings[RPC_DISPLAY_HEX_PORT] = kstrdup(buf, GFP_KERNEL); +} + +static void xs_format_peer_addresses(struct rpc_xprt *xprt, + const char *protocol, + const char *netid) +{ + xprt->address_strings[RPC_DISPLAY_PROTO] = protocol; + xprt->address_strings[RPC_DISPLAY_NETID] = netid; + xs_format_common_peer_addresses(xprt); + xs_format_common_peer_ports(xprt); +} + +static void xs_update_peer_port(struct rpc_xprt *xprt) +{ + kfree(xprt->address_strings[RPC_DISPLAY_HEX_PORT]); + kfree(xprt->address_strings[RPC_DISPLAY_PORT]); + + xs_format_common_peer_ports(xprt); +} + +static void xs_free_peer_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]); + } +} + #define XS_SENDMSG_FLAGS (MSG_DONTWAIT | MSG_NOSIGNAL) -static inline int xs_send_head(struct socket *sock, struct sockaddr *addr, int addrlen, struct xdr_buf *xdr, unsigned int base, unsigned int len) +static int xs_send_kvec(struct socket *sock, struct sockaddr *addr, int addrlen, struct kvec *vec, unsigned int base, int more) { - struct kvec iov = { - .iov_base = xdr->head[0].iov_base + base, - .iov_len = len - base, - }; struct msghdr msg = { .msg_name = addr, .msg_namelen = addrlen, - .msg_flags = XS_SENDMSG_FLAGS, + .msg_flags = XS_SENDMSG_FLAGS | (more ? MSG_MORE : 0), + }; + struct kvec iov = { + .iov_base = vec->iov_base + base, + .iov_len = vec->iov_len - base, }; - if (xdr->len > len) - msg.msg_flags |= MSG_MORE; - - if (likely(iov.iov_len)) + if (iov.iov_len != 0) return kernel_sendmsg(sock, &msg, &iov, 1, iov.iov_len); return kernel_sendmsg(sock, &msg, NULL, 0, 0); } -static int xs_send_tail(struct socket *sock, struct xdr_buf *xdr, unsigned int base, unsigned int len) +static int xs_send_pagedata(struct socket *sock, struct xdr_buf *xdr, unsigned int base, int more, bool zerocopy) { - struct kvec iov = { - .iov_base = xdr->tail[0].iov_base + base, - .iov_len = len - base, - }; - struct msghdr msg = { - .msg_flags = XS_SENDMSG_FLAGS, - }; + ssize_t (*do_sendpage)(struct socket *sock, struct page *page, + int offset, size_t size, int flags); + struct page **ppage; + unsigned int remainder; + int err, sent = 0; + + remainder = xdr->page_len - base; + base += xdr->page_base; + ppage = xdr->pages + (base >> PAGE_SHIFT); + base &= ~PAGE_MASK; + do_sendpage = sock->ops->sendpage; + if (!zerocopy) + do_sendpage = sock_no_sendpage; + for(;;) { + unsigned int len = min_t(unsigned int, PAGE_SIZE - base, remainder); + int flags = XS_SENDMSG_FLAGS; - return kernel_sendmsg(sock, &msg, &iov, 1, iov.iov_len); + remainder -= len; + if (remainder != 0 || more) + flags |= MSG_MORE; + err = do_sendpage(sock, *ppage, base, len, flags); + if (remainder == 0 || err != len) + break; + sent += err; + ppage++; + base = 0; + } + if (sent == 0) + return err; + if (err > 0) + sent += err; + return sent; } /** @@ -157,83 +442,62 @@ static int xs_send_tail(struct socket *sock, struct xdr_buf *xdr, unsigned int b * @addrlen: UDP only -- length of destination address * @xdr: buffer containing this request * @base: starting position in the buffer + * @zerocopy: true if it is safe to use sendpage() * */ -static inline int xs_sendpages(struct socket *sock, struct sockaddr *addr, int addrlen, struct xdr_buf *xdr, unsigned int base) +static int xs_sendpages(struct socket *sock, struct sockaddr *addr, int addrlen, struct xdr_buf *xdr, unsigned int base, bool zerocopy) { - struct page **ppage = xdr->pages; - unsigned int len, pglen = xdr->page_len; - int err, ret = 0; - ssize_t (*sendpage)(struct socket *, struct page *, int, size_t, int); + unsigned int remainder = xdr->len - base; + int err, sent = 0; if (unlikely(!sock)) - return -ENOTCONN; + return -ENOTSOCK; clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags); + if (base != 0) { + addr = NULL; + addrlen = 0; + } - len = xdr->head[0].iov_len; - if (base < len || (addr != NULL && base == 0)) { - err = xs_send_head(sock, addr, addrlen, xdr, base, len); - if (ret == 0) - ret = err; - else if (err > 0) - ret += err; - if (err != (len - base)) + if (base < xdr->head[0].iov_len || addr != NULL) { + unsigned int len = xdr->head[0].iov_len - base; + remainder -= len; + err = xs_send_kvec(sock, addr, addrlen, &xdr->head[0], base, remainder != 0); + if (remainder == 0 || err != len) goto out; + sent += err; base = 0; } else - base -= len; + base -= xdr->head[0].iov_len; - if (unlikely(pglen == 0)) - goto copy_tail; - if (unlikely(base >= pglen)) { - base -= pglen; - goto copy_tail; - } - if (base || xdr->page_base) { - pglen -= base; - base += xdr->page_base; - ppage += base >> PAGE_CACHE_SHIFT; - base &= ~PAGE_CACHE_MASK; - } - - sendpage = sock->ops->sendpage ? : sock_no_sendpage; - do { - int flags = XS_SENDMSG_FLAGS; - - len = PAGE_CACHE_SIZE; - if (base) - len -= base; - if (pglen < len) - len = pglen; - - if (pglen != len || xdr->tail[0].iov_len != 0) - flags |= MSG_MORE; - - /* Hmm... We might be dealing with highmem pages */ - if (PageHighMem(*ppage)) - sendpage = sock_no_sendpage; - err = sendpage(sock, *ppage, base, len, flags); - if (ret == 0) - ret = err; - else if (err > 0) - ret += err; - if (err != len) + if (base < xdr->page_len) { + unsigned int len = xdr->page_len - base; + remainder -= len; + err = xs_send_pagedata(sock, xdr, base, remainder != 0, zerocopy); + if (remainder == 0 || err != len) goto out; + sent += err; base = 0; - ppage++; - } while ((pglen -= len) != 0); -copy_tail: - len = xdr->tail[0].iov_len; - if (base < len) { - err = xs_send_tail(sock, xdr, base, len); - if (ret == 0) - ret = err; - else if (err > 0) - ret += err; - } + } else + base -= xdr->page_len; + + if (base >= xdr->tail[0].iov_len) + return sent; + err = xs_send_kvec(sock, NULL, 0, &xdr->tail[0], base, 0); out: - return ret; + if (sent == 0) + return err; + if (err > 0) + sent += err; + return sent; +} + +static void xs_nospace_callback(struct rpc_task *task) +{ + struct sock_xprt *transport = container_of(task->tk_rqstp->rq_xprt, struct sock_xprt, xprt); + + transport->inet->sk_write_pending--; + clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags); } /** @@ -241,29 +505,107 @@ out: * @task: task to put to sleep * */ -static void xs_nospace(struct rpc_task *task) +static int xs_nospace(struct rpc_task *task) { struct rpc_rqst *req = task->tk_rqstp; struct rpc_xprt *xprt = req->rq_xprt; + struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); + struct sock *sk = transport->inet; + int ret = -EAGAIN; - dprintk("RPC: %4d xmit incomplete (%u left of %u)\n", + dprintk("RPC: %5u xmit incomplete (%u left of %u)\n", task->tk_pid, req->rq_slen - req->rq_bytes_sent, req->rq_slen); - if (test_bit(SOCK_ASYNC_NOSPACE, &xprt->sock->flags)) { - /* Protect against races with write_space */ - spin_lock_bh(&xprt->transport_lock); + /* Protect against races with write_space */ + spin_lock_bh(&xprt->transport_lock); + + /* Don't race with disconnect */ + if (xprt_connected(xprt)) { + if (test_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags)) { + /* + * Notify TCP that we're limited by the application + * window size + */ + set_bit(SOCK_NOSPACE, &transport->sock->flags); + sk->sk_write_pending++; + /* ...and wait for more buffer space */ + xprt_wait_for_buffer_space(task, xs_nospace_callback); + } + } else { + clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags); + ret = -ENOTCONN; + } - /* Don't race with disconnect */ - if (!xprt_connected(xprt)) - task->tk_status = -ENOTCONN; - else if (test_bit(SOCK_NOSPACE, &xprt->sock->flags)) - xprt_wait_for_buffer_space(task); + spin_unlock_bh(&xprt->transport_lock); - spin_unlock_bh(&xprt->transport_lock); - } else - /* Keep holding the socket if it is blocked */ - rpc_delay(task, HZ>>4); + /* Race breaker in case memory is freed before above code is called */ + sk->sk_write_space(sk); + return ret; +} + +/* + * Construct a stream transport record marker in @buf. + */ +static inline void xs_encode_stream_record_marker(struct xdr_buf *buf) +{ + u32 reclen = buf->len - sizeof(rpc_fraghdr); + rpc_fraghdr *base = buf->head[0].iov_base; + *base = cpu_to_be32(RPC_LAST_STREAM_FRAGMENT | reclen); +} + +/** + * xs_local_send_request - write an RPC request to an AF_LOCAL socket + * @task: RPC task that manages the state of an RPC request + * + * Return values: + * 0: The request has been sent + * EAGAIN: The socket was blocked, please call again later to + * complete the request + * ENOTCONN: Caller needs to invoke connect logic then call again + * other: Some other error occured, the request was not sent + */ +static int xs_local_send_request(struct rpc_task *task) +{ + struct rpc_rqst *req = task->tk_rqstp; + struct rpc_xprt *xprt = req->rq_xprt; + struct sock_xprt *transport = + container_of(xprt, struct sock_xprt, xprt); + struct xdr_buf *xdr = &req->rq_snd_buf; + int status; + + xs_encode_stream_record_marker(&req->rq_snd_buf); + + xs_pktdump("packet data:", + req->rq_svec->iov_base, req->rq_svec->iov_len); + + status = xs_sendpages(transport->sock, NULL, 0, + xdr, req->rq_bytes_sent, true); + dprintk("RPC: %s(%u) = %d\n", + __func__, xdr->len - req->rq_bytes_sent, status); + if (likely(status >= 0)) { + req->rq_bytes_sent += status; + req->rq_xmit_bytes_sent += status; + if (likely(req->rq_bytes_sent >= req->rq_slen)) { + req->rq_bytes_sent = 0; + return 0; + } + status = -EAGAIN; + } + + switch (status) { + case -EAGAIN: + status = xs_nospace(task); + break; + default: + dprintk("RPC: sendmsg returned unrecognized error %d\n", + -status); + case -EPIPE: + xs_close(xprt); + status = -ENOTCONN; + } + + return status; } /** @@ -275,12 +617,13 @@ static void xs_nospace(struct rpc_task *task) * EAGAIN: The socket was blocked, please call again later to * complete the request * ENOTCONN: Caller needs to invoke connect logic then call again - * other: Some other error occured, the request was not sent + * other: Some other error occurred, the request was not sent */ static int xs_udp_send_request(struct rpc_task *task) { struct rpc_rqst *req = task->tk_rqstp; struct rpc_xprt *xprt = req->rq_xprt; + struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); struct xdr_buf *xdr = &req->rq_snd_buf; int status; @@ -288,44 +631,62 @@ static int xs_udp_send_request(struct rpc_task *task) req->rq_svec->iov_base, req->rq_svec->iov_len); - req->rq_xtime = jiffies; - status = xs_sendpages(xprt->sock, (struct sockaddr *) &xprt->addr, - sizeof(xprt->addr), xdr, req->rq_bytes_sent); + if (!xprt_bound(xprt)) + return -ENOTCONN; + status = xs_sendpages(transport->sock, + xs_addr(xprt), + xprt->addrlen, xdr, + req->rq_bytes_sent, true); - dprintk("RPC: xs_udp_send_request(%u) = %d\n", + dprintk("RPC: xs_udp_send_request(%u) = %d\n", xdr->len - req->rq_bytes_sent, status); - if (likely(status >= (int) req->rq_slen)) - return 0; - - /* Still some bytes left; set up for a retry later. */ - if (status > 0) + if (status >= 0) { + req->rq_xmit_bytes_sent += status; + if (status >= req->rq_slen) + return 0; + /* Still some bytes left; set up for a retry later. */ status = -EAGAIN; + } switch (status) { - case -ENETUNREACH: - case -EPIPE: - case -ECONNREFUSED: - /* When the server has died, an ICMP port unreachable message - * prompts ECONNREFUSED. */ + case -ENOTSOCK: + status = -ENOTCONN; + /* Should we call xs_close() here? */ break; case -EAGAIN: - xs_nospace(task); + status = xs_nospace(task); break; default: - dprintk("RPC: sendmsg returned unrecognized error %d\n", + dprintk("RPC: sendmsg returned unrecognized error %d\n", -status); - break; + case -ENETUNREACH: + case -EPIPE: + case -ECONNREFUSED: + /* When the server has died, an ICMP port unreachable message + * prompts ECONNREFUSED. */ + clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags); } return status; } -static inline void xs_encode_tcp_record_marker(struct xdr_buf *buf) +/** + * xs_tcp_shutdown - gracefully shut down a TCP socket + * @xprt: transport + * + * Initiates a graceful shutdown of the TCP socket by calling the + * equivalent of shutdown(SHUT_WR); + */ +static void xs_tcp_shutdown(struct rpc_xprt *xprt) { - u32 reclen = buf->len - sizeof(rpc_fraghdr); - rpc_fraghdr *base = buf->head[0].iov_base; - *base = htonl(RPC_LAST_STREAM_FRAGMENT | reclen); + struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); + struct socket *sock = transport->sock; + + if (sock != NULL) { + kernel_sock_shutdown(sock, SHUT_WR); + trace_rpc_socket_shutdown(xprt, sock); + } } /** @@ -337,7 +698,7 @@ static inline void xs_encode_tcp_record_marker(struct xdr_buf *buf) * EAGAIN: The socket was blocked, please call again later to * complete the request * ENOTCONN: Caller needs to invoke connect logic then call again - * other: Some other error occured, the request was not sent + * other: Some other error occurred, the request was not sent * * XXX: In the case of soft timeouts, should we eventually give up * if sendmsg is not able to make progress? @@ -346,24 +707,32 @@ static int xs_tcp_send_request(struct rpc_task *task) { struct rpc_rqst *req = task->tk_rqstp; struct rpc_xprt *xprt = req->rq_xprt; + struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); struct xdr_buf *xdr = &req->rq_snd_buf; - int status, retry = 0; + bool zerocopy = true; + int status; - xs_encode_tcp_record_marker(&req->rq_snd_buf); + xs_encode_stream_record_marker(&req->rq_snd_buf); xs_pktdump("packet data:", req->rq_svec->iov_base, req->rq_svec->iov_len); + /* Don't use zero copy if this is a resend. If the RPC call + * completes while the socket holds a reference to the pages, + * then we may end up resending corrupted data. + */ + if (task->tk_flags & RPC_TASK_SENT) + zerocopy = false; /* Continue transmitting the packet/record. We must be careful * to cope with writespace callbacks arriving _after_ we have * called sendmsg(). */ while (1) { - req->rq_xtime = jiffies; - status = xs_sendpages(xprt->sock, NULL, 0, xdr, - req->rq_bytes_sent); + status = xs_sendpages(transport->sock, + NULL, 0, xdr, req->rq_bytes_sent, + zerocopy); - dprintk("RPC: xs_tcp_send_request(%u) = %d\n", + dprintk("RPC: xs_tcp_send_request(%u) = %d\n", xdr->len - req->rq_bytes_sent, status); if (unlikely(status < 0)) @@ -372,88 +741,269 @@ static int xs_tcp_send_request(struct rpc_task *task) /* If we've sent the entire packet, immediately * reset the count of bytes sent. */ req->rq_bytes_sent += status; + req->rq_xmit_bytes_sent += status; if (likely(req->rq_bytes_sent >= req->rq_slen)) { req->rq_bytes_sent = 0; return 0; } + if (status != 0) + continue; status = -EAGAIN; - if (retry++ > XS_SENDMSG_RETRY) - break; + break; } switch (status) { + case -ENOTSOCK: + status = -ENOTCONN; + /* Should we call xs_close() here? */ + break; case -EAGAIN: - xs_nospace(task); + status = xs_nospace(task); break; - case -ECONNREFUSED: + default: + dprintk("RPC: sendmsg returned unrecognized error %d\n", + -status); case -ECONNRESET: + xs_tcp_shutdown(xprt); + case -ECONNREFUSED: case -ENOTCONN: case -EPIPE: - status = -ENOTCONN; - break; - default: - dprintk("RPC: sendmsg returned unrecognized error %d\n", - -status); - xprt_disconnect(xprt); - break; + clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags); } return status; } /** - * xs_close - close a socket + * xs_tcp_release_xprt - clean up after a tcp transmission * @xprt: transport + * @task: rpc task * - * This is used when all requests are complete; ie, no DRC state remains - * on the server we want to save. + * This cleans up if an error causes us to abort the transmission of a request. + * In this case, the socket may need to be reset in order to avoid confusing + * the server. */ -static void xs_close(struct rpc_xprt *xprt) +static void xs_tcp_release_xprt(struct rpc_xprt *xprt, struct rpc_task *task) +{ + struct rpc_rqst *req; + + if (task != xprt->snd_task) + return; + if (task == NULL) + goto out_release; + req = task->tk_rqstp; + if (req == NULL) + goto out_release; + if (req->rq_bytes_sent == 0) + goto out_release; + if (req->rq_bytes_sent == req->rq_snd_buf.len) + goto out_release; + set_bit(XPRT_CLOSE_WAIT, &xprt->state); +out_release: + xprt_release_xprt(xprt, task); +} + +static void xs_save_old_callbacks(struct sock_xprt *transport, struct sock *sk) +{ + transport->old_data_ready = sk->sk_data_ready; + transport->old_state_change = sk->sk_state_change; + transport->old_write_space = sk->sk_write_space; + transport->old_error_report = sk->sk_error_report; +} + +static void xs_restore_old_callbacks(struct sock_xprt *transport, struct sock *sk) +{ + sk->sk_data_ready = transport->old_data_ready; + sk->sk_state_change = transport->old_state_change; + sk->sk_write_space = transport->old_write_space; + sk->sk_error_report = transport->old_error_report; +} + +/** + * xs_error_report - callback to handle TCP socket state errors + * @sk: socket + * + * Note: we don't call sock_error() since there may be a rpc_task + * using the socket, and so we don't want to clear sk->sk_err. + */ +static void xs_error_report(struct sock *sk) { - struct socket *sock = xprt->sock; - struct sock *sk = xprt->inet; + struct rpc_xprt *xprt; + int err; + + read_lock_bh(&sk->sk_callback_lock); + if (!(xprt = xprt_from_sock(sk))) + goto out; - if (!sk) + err = -sk->sk_err; + if (err == 0) + goto out; + dprintk("RPC: xs_error_report client %p, error=%d...\n", + xprt, -err); + trace_rpc_socket_error(xprt, sk->sk_socket, err); + xprt_wake_pending_tasks(xprt, err); + out: + read_unlock_bh(&sk->sk_callback_lock); +} + +static void xs_reset_transport(struct sock_xprt *transport) +{ + struct socket *sock = transport->sock; + struct sock *sk = transport->inet; + + if (sk == NULL) return; - dprintk("RPC: xs_close xprt %p\n", xprt); + transport->srcport = 0; write_lock_bh(&sk->sk_callback_lock); - xprt->inet = NULL; - xprt->sock = NULL; + transport->inet = NULL; + transport->sock = NULL; sk->sk_user_data = NULL; - sk->sk_data_ready = xprt->old_data_ready; - sk->sk_state_change = xprt->old_state_change; - sk->sk_write_space = xprt->old_write_space; - write_unlock_bh(&sk->sk_callback_lock); - sk->sk_no_check = 0; + xs_restore_old_callbacks(transport, sk); + write_unlock_bh(&sk->sk_callback_lock); + trace_rpc_socket_close(&transport->xprt, sock); sock_release(sock); } /** + * xs_close - close a socket + * @xprt: transport + * + * This is used when all requests are complete; ie, no DRC state remains + * on the server we want to save. + * + * The caller _must_ be holding XPRT_LOCKED in order to avoid issues with + * xs_reset_transport() zeroing the socket from underneath a writer. + */ +static void xs_close(struct rpc_xprt *xprt) +{ + struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); + + dprintk("RPC: xs_close xprt %p\n", xprt); + + cancel_delayed_work_sync(&transport->connect_worker); + + xs_reset_transport(transport); + xprt->reestablish_timeout = 0; + + smp_mb__before_atomic(); + clear_bit(XPRT_CONNECTION_ABORT, &xprt->state); + clear_bit(XPRT_CLOSE_WAIT, &xprt->state); + clear_bit(XPRT_CLOSING, &xprt->state); + smp_mb__after_atomic(); + xprt_disconnect_done(xprt); +} + +static void xs_tcp_close(struct rpc_xprt *xprt) +{ + if (test_and_clear_bit(XPRT_CONNECTION_CLOSE, &xprt->state)) + xs_close(xprt); + else + xs_tcp_shutdown(xprt); +} + +static void xs_xprt_free(struct rpc_xprt *xprt) +{ + xs_free_peer_addresses(xprt); + xprt_free(xprt); +} + +/** * xs_destroy - prepare to shutdown a transport * @xprt: doomed transport * */ static void xs_destroy(struct rpc_xprt *xprt) { - dprintk("RPC: xs_destroy xprt %p\n", xprt); + dprintk("RPC: xs_destroy xprt %p\n", xprt); - cancel_delayed_work(&xprt->connect_worker); - flush_scheduled_work(); - - xprt_disconnect(xprt); xs_close(xprt); - kfree(xprt->slot); + xs_xprt_free(xprt); + module_put(THIS_MODULE); } -static inline struct rpc_xprt *xprt_from_sock(struct sock *sk) +static int xs_local_copy_to_xdr(struct xdr_buf *xdr, struct sk_buff *skb) { - return (struct rpc_xprt *) sk->sk_user_data; + struct xdr_skb_reader desc = { + .skb = skb, + .offset = sizeof(rpc_fraghdr), + .count = skb->len - sizeof(rpc_fraghdr), + }; + + if (xdr_partial_copy_from_skb(xdr, 0, &desc, xdr_skb_read_bits) < 0) + return -1; + if (desc.count) + return -1; + return 0; +} + +/** + * xs_local_data_ready - "data ready" callback for AF_LOCAL sockets + * @sk: socket with data to read + * @len: how much data to read + * + * Currently this assumes we can read the whole reply in a single gulp. + */ +static void xs_local_data_ready(struct sock *sk) +{ + struct rpc_task *task; + struct rpc_xprt *xprt; + struct rpc_rqst *rovr; + struct sk_buff *skb; + int err, repsize, copied; + u32 _xid; + __be32 *xp; + + read_lock_bh(&sk->sk_callback_lock); + dprintk("RPC: %s...\n", __func__); + xprt = xprt_from_sock(sk); + if (xprt == NULL) + goto out; + + skb = skb_recv_datagram(sk, 0, 1, &err); + if (skb == NULL) + goto out; + + repsize = skb->len - sizeof(rpc_fraghdr); + if (repsize < 4) { + dprintk("RPC: impossible RPC reply size %d\n", repsize); + goto dropit; + } + + /* Copy the XID from the skb... */ + xp = skb_header_pointer(skb, sizeof(rpc_fraghdr), sizeof(_xid), &_xid); + if (xp == NULL) + goto dropit; + + /* Look up and lock the request corresponding to the given XID */ + spin_lock(&xprt->transport_lock); + rovr = xprt_lookup_rqst(xprt, *xp); + if (!rovr) + goto out_unlock; + task = rovr->rq_task; + + copied = rovr->rq_private_buf.buflen; + if (copied > repsize) + copied = repsize; + + if (xs_local_copy_to_xdr(&rovr->rq_private_buf, skb)) { + dprintk("RPC: sk_buff copy failed\n"); + goto out_unlock; + } + + xprt_complete_rqst(task, copied); + + out_unlock: + spin_unlock(&xprt->transport_lock); + dropit: + skb_free_datagram(sk, skb); + out: + read_unlock_bh(&sk->sk_callback_lock); } /** @@ -462,29 +1012,27 @@ static inline struct rpc_xprt *xprt_from_sock(struct sock *sk) * @len: how much data to read * */ -static void xs_udp_data_ready(struct sock *sk, int len) +static void xs_udp_data_ready(struct sock *sk) { struct rpc_task *task; struct rpc_xprt *xprt; struct rpc_rqst *rovr; struct sk_buff *skb; int err, repsize, copied; - u32 _xid, *xp; + u32 _xid; + __be32 *xp; - read_lock(&sk->sk_callback_lock); - dprintk("RPC: xs_udp_data_ready...\n"); + read_lock_bh(&sk->sk_callback_lock); + dprintk("RPC: xs_udp_data_ready...\n"); if (!(xprt = xprt_from_sock(sk))) goto out; if ((skb = skb_recv_datagram(sk, 0, 1, &err)) == NULL) goto out; - if (xprt->shutdown) - goto dropit; - repsize = skb->len - sizeof(struct udphdr); if (repsize < 4) { - dprintk("RPC: impossible RPC reply size %d!\n", repsize); + dprintk("RPC: impossible RPC reply size %d!\n", repsize); goto dropit; } @@ -505,14 +1053,14 @@ static void xs_udp_data_ready(struct sock *sk, int len) copied = repsize; /* Suck it into the iovec, verify checksum if not done by hw. */ - if (csum_partial_copy_to_xdr(&rovr->rq_private_buf, skb)) + if (csum_partial_copy_to_xdr(&rovr->rq_private_buf, skb)) { + UDPX_INC_STATS_BH(sk, UDP_MIB_INERRORS); goto out_unlock; + } - /* Something worked... */ - dst_confirm(skb->dst); + UDPX_INC_STATS_BH(sk, UDP_MIB_INDATAGRAMS); - xprt_adjust_cwnd(task, copied); - xprt_update_rtt(task); + xprt_adjust_cwnd(xprt, task, copied); xprt_complete_rqst(task, copied); out_unlock: @@ -520,213 +1068,364 @@ static void xs_udp_data_ready(struct sock *sk, int len) dropit: skb_free_datagram(sk, skb); out: - read_unlock(&sk->sk_callback_lock); + read_unlock_bh(&sk->sk_callback_lock); } -static inline size_t xs_tcp_copy_data(skb_reader_t *desc, void *p, size_t len) +/* + * Helper function to force a TCP close if the server is sending + * junk and/or it has put us in CLOSE_WAIT + */ +static void xs_tcp_force_close(struct rpc_xprt *xprt) { - if (len > desc->count) - len = desc->count; - if (skb_copy_bits(desc->skb, desc->offset, p, len)) { - dprintk("RPC: failed to copy %zu bytes from skb. %zu bytes remain\n", - len, desc->count); - return 0; - } - desc->offset += len; - desc->count -= len; - dprintk("RPC: copied %zu bytes from skb. %zu bytes remain\n", - len, desc->count); - return len; + set_bit(XPRT_CONNECTION_CLOSE, &xprt->state); + xprt_force_disconnect(xprt); } -static inline void xs_tcp_read_fraghdr(struct rpc_xprt *xprt, skb_reader_t *desc) +static inline void xs_tcp_read_fraghdr(struct rpc_xprt *xprt, struct xdr_skb_reader *desc) { + struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); size_t len, used; char *p; - p = ((char *) &xprt->tcp_recm) + xprt->tcp_offset; - len = sizeof(xprt->tcp_recm) - xprt->tcp_offset; - used = xs_tcp_copy_data(desc, p, len); - xprt->tcp_offset += used; + p = ((char *) &transport->tcp_fraghdr) + transport->tcp_offset; + len = sizeof(transport->tcp_fraghdr) - transport->tcp_offset; + used = xdr_skb_read_bits(desc, p, len); + transport->tcp_offset += used; if (used != len) return; - xprt->tcp_reclen = ntohl(xprt->tcp_recm); - if (xprt->tcp_reclen & RPC_LAST_STREAM_FRAGMENT) - xprt->tcp_flags |= XPRT_LAST_FRAG; + transport->tcp_reclen = ntohl(transport->tcp_fraghdr); + if (transport->tcp_reclen & RPC_LAST_STREAM_FRAGMENT) + transport->tcp_flags |= TCP_RCV_LAST_FRAG; else - xprt->tcp_flags &= ~XPRT_LAST_FRAG; - xprt->tcp_reclen &= RPC_FRAGMENT_SIZE_MASK; + transport->tcp_flags &= ~TCP_RCV_LAST_FRAG; + transport->tcp_reclen &= RPC_FRAGMENT_SIZE_MASK; - xprt->tcp_flags &= ~XPRT_COPY_RECM; - xprt->tcp_offset = 0; + transport->tcp_flags &= ~TCP_RCV_COPY_FRAGHDR; + transport->tcp_offset = 0; /* Sanity check of the record length */ - if (unlikely(xprt->tcp_reclen < 4)) { - dprintk("RPC: invalid TCP record fragment length\n"); - xprt_disconnect(xprt); + if (unlikely(transport->tcp_reclen < 8)) { + dprintk("RPC: invalid TCP record fragment length\n"); + xs_tcp_force_close(xprt); return; } - dprintk("RPC: reading TCP record fragment of length %d\n", - xprt->tcp_reclen); + dprintk("RPC: reading TCP record fragment of length %d\n", + transport->tcp_reclen); } -static void xs_tcp_check_recm(struct rpc_xprt *xprt) +static void xs_tcp_check_fraghdr(struct sock_xprt *transport) { - dprintk("RPC: xprt = %p, tcp_copied = %lu, tcp_offset = %u, tcp_reclen = %u, tcp_flags = %lx\n", - xprt, xprt->tcp_copied, xprt->tcp_offset, xprt->tcp_reclen, xprt->tcp_flags); - if (xprt->tcp_offset == xprt->tcp_reclen) { - xprt->tcp_flags |= XPRT_COPY_RECM; - xprt->tcp_offset = 0; - if (xprt->tcp_flags & XPRT_LAST_FRAG) { - xprt->tcp_flags &= ~XPRT_COPY_DATA; - xprt->tcp_flags |= XPRT_COPY_XID; - xprt->tcp_copied = 0; + if (transport->tcp_offset == transport->tcp_reclen) { + transport->tcp_flags |= TCP_RCV_COPY_FRAGHDR; + transport->tcp_offset = 0; + if (transport->tcp_flags & TCP_RCV_LAST_FRAG) { + transport->tcp_flags &= ~TCP_RCV_COPY_DATA; + transport->tcp_flags |= TCP_RCV_COPY_XID; + transport->tcp_copied = 0; } } } -static inline void xs_tcp_read_xid(struct rpc_xprt *xprt, skb_reader_t *desc) +static inline void xs_tcp_read_xid(struct sock_xprt *transport, struct xdr_skb_reader *desc) { size_t len, used; char *p; - len = sizeof(xprt->tcp_xid) - xprt->tcp_offset; - dprintk("RPC: reading XID (%Zu bytes)\n", len); - p = ((char *) &xprt->tcp_xid) + xprt->tcp_offset; - used = xs_tcp_copy_data(desc, p, len); - xprt->tcp_offset += used; + len = sizeof(transport->tcp_xid) - transport->tcp_offset; + dprintk("RPC: reading XID (%Zu bytes)\n", len); + p = ((char *) &transport->tcp_xid) + transport->tcp_offset; + used = xdr_skb_read_bits(desc, p, len); + transport->tcp_offset += used; if (used != len) return; - xprt->tcp_flags &= ~XPRT_COPY_XID; - xprt->tcp_flags |= XPRT_COPY_DATA; - xprt->tcp_copied = 4; - dprintk("RPC: reading reply for XID %08x\n", - ntohl(xprt->tcp_xid)); - xs_tcp_check_recm(xprt); + transport->tcp_flags &= ~TCP_RCV_COPY_XID; + transport->tcp_flags |= TCP_RCV_READ_CALLDIR; + transport->tcp_copied = 4; + dprintk("RPC: reading %s XID %08x\n", + (transport->tcp_flags & TCP_RPC_REPLY) ? "reply for" + : "request with", + ntohl(transport->tcp_xid)); + xs_tcp_check_fraghdr(transport); } -static inline void xs_tcp_read_request(struct rpc_xprt *xprt, skb_reader_t *desc) +static inline void xs_tcp_read_calldir(struct sock_xprt *transport, + struct xdr_skb_reader *desc) { - struct rpc_rqst *req; + size_t len, used; + u32 offset; + char *p; + + /* + * We want transport->tcp_offset to be 8 at the end of this routine + * (4 bytes for the xid and 4 bytes for the call/reply flag). + * When this function is called for the first time, + * transport->tcp_offset is 4 (after having already read the xid). + */ + offset = transport->tcp_offset - sizeof(transport->tcp_xid); + len = sizeof(transport->tcp_calldir) - offset; + dprintk("RPC: reading CALL/REPLY flag (%Zu bytes)\n", len); + p = ((char *) &transport->tcp_calldir) + offset; + used = xdr_skb_read_bits(desc, p, len); + transport->tcp_offset += used; + if (used != len) + return; + transport->tcp_flags &= ~TCP_RCV_READ_CALLDIR; + /* + * We don't yet have the XDR buffer, so we will write the calldir + * out after we get the buffer from the 'struct rpc_rqst' + */ + switch (ntohl(transport->tcp_calldir)) { + case RPC_REPLY: + transport->tcp_flags |= TCP_RCV_COPY_CALLDIR; + transport->tcp_flags |= TCP_RCV_COPY_DATA; + transport->tcp_flags |= TCP_RPC_REPLY; + break; + case RPC_CALL: + transport->tcp_flags |= TCP_RCV_COPY_CALLDIR; + transport->tcp_flags |= TCP_RCV_COPY_DATA; + transport->tcp_flags &= ~TCP_RPC_REPLY; + break; + default: + dprintk("RPC: invalid request message type\n"); + xs_tcp_force_close(&transport->xprt); + } + xs_tcp_check_fraghdr(transport); +} + +static inline void xs_tcp_read_common(struct rpc_xprt *xprt, + struct xdr_skb_reader *desc, + struct rpc_rqst *req) +{ + struct sock_xprt *transport = + container_of(xprt, struct sock_xprt, xprt); struct xdr_buf *rcvbuf; size_t len; ssize_t r; - /* Find and lock the request corresponding to this xid */ - spin_lock(&xprt->transport_lock); - req = xprt_lookup_rqst(xprt, xprt->tcp_xid); - if (!req) { - xprt->tcp_flags &= ~XPRT_COPY_DATA; - dprintk("RPC: XID %08x request not found!\n", - ntohl(xprt->tcp_xid)); - spin_unlock(&xprt->transport_lock); - return; + rcvbuf = &req->rq_private_buf; + + if (transport->tcp_flags & TCP_RCV_COPY_CALLDIR) { + /* + * Save the RPC direction in the XDR buffer + */ + memcpy(rcvbuf->head[0].iov_base + transport->tcp_copied, + &transport->tcp_calldir, + sizeof(transport->tcp_calldir)); + transport->tcp_copied += sizeof(transport->tcp_calldir); + transport->tcp_flags &= ~TCP_RCV_COPY_CALLDIR; } - rcvbuf = &req->rq_private_buf; len = desc->count; - if (len > xprt->tcp_reclen - xprt->tcp_offset) { - skb_reader_t my_desc; + if (len > transport->tcp_reclen - transport->tcp_offset) { + struct xdr_skb_reader my_desc; - len = xprt->tcp_reclen - xprt->tcp_offset; + len = transport->tcp_reclen - transport->tcp_offset; memcpy(&my_desc, desc, sizeof(my_desc)); my_desc.count = len; - r = xdr_partial_copy_from_skb(rcvbuf, xprt->tcp_copied, - &my_desc, xs_tcp_copy_data); + r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied, + &my_desc, xdr_skb_read_bits); desc->count -= r; desc->offset += r; } else - r = xdr_partial_copy_from_skb(rcvbuf, xprt->tcp_copied, - desc, xs_tcp_copy_data); + r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied, + desc, xdr_skb_read_bits); if (r > 0) { - xprt->tcp_copied += r; - xprt->tcp_offset += r; + transport->tcp_copied += r; + transport->tcp_offset += r; } if (r != len) { /* Error when copying to the receive buffer, * usually because we weren't able to allocate * additional buffer pages. All we can do now - * is turn off XPRT_COPY_DATA, so the request + * is turn off TCP_RCV_COPY_DATA, so the request * will not receive any additional updates, * and time out. * Any remaining data from this record will * be discarded. */ - xprt->tcp_flags &= ~XPRT_COPY_DATA; - dprintk("RPC: XID %08x truncated request\n", - ntohl(xprt->tcp_xid)); - dprintk("RPC: xprt = %p, tcp_copied = %lu, tcp_offset = %u, tcp_reclen = %u\n", - xprt, xprt->tcp_copied, xprt->tcp_offset, xprt->tcp_reclen); - goto out; + transport->tcp_flags &= ~TCP_RCV_COPY_DATA; + dprintk("RPC: XID %08x truncated request\n", + ntohl(transport->tcp_xid)); + dprintk("RPC: xprt = %p, tcp_copied = %lu, " + "tcp_offset = %u, tcp_reclen = %u\n", + xprt, transport->tcp_copied, + transport->tcp_offset, transport->tcp_reclen); + return; } - dprintk("RPC: XID %08x read %Zd bytes\n", - ntohl(xprt->tcp_xid), r); - dprintk("RPC: xprt = %p, tcp_copied = %lu, tcp_offset = %u, tcp_reclen = %u\n", - xprt, xprt->tcp_copied, xprt->tcp_offset, xprt->tcp_reclen); + dprintk("RPC: XID %08x read %Zd bytes\n", + ntohl(transport->tcp_xid), r); + dprintk("RPC: xprt = %p, tcp_copied = %lu, tcp_offset = %u, " + "tcp_reclen = %u\n", xprt, transport->tcp_copied, + transport->tcp_offset, transport->tcp_reclen); + + if (transport->tcp_copied == req->rq_private_buf.buflen) + transport->tcp_flags &= ~TCP_RCV_COPY_DATA; + else if (transport->tcp_offset == transport->tcp_reclen) { + if (transport->tcp_flags & TCP_RCV_LAST_FRAG) + transport->tcp_flags &= ~TCP_RCV_COPY_DATA; + } +} - if (xprt->tcp_copied == req->rq_private_buf.buflen) - xprt->tcp_flags &= ~XPRT_COPY_DATA; - else if (xprt->tcp_offset == xprt->tcp_reclen) { - if (xprt->tcp_flags & XPRT_LAST_FRAG) - xprt->tcp_flags &= ~XPRT_COPY_DATA; +/* + * Finds the request corresponding to the RPC xid and invokes the common + * tcp read code to read the data. + */ +static inline int xs_tcp_read_reply(struct rpc_xprt *xprt, + struct xdr_skb_reader *desc) +{ + struct sock_xprt *transport = + container_of(xprt, struct sock_xprt, xprt); + struct rpc_rqst *req; + + dprintk("RPC: read reply XID %08x\n", ntohl(transport->tcp_xid)); + + /* Find and lock the request corresponding to this xid */ + spin_lock(&xprt->transport_lock); + req = xprt_lookup_rqst(xprt, transport->tcp_xid); + if (!req) { + dprintk("RPC: XID %08x request not found!\n", + ntohl(transport->tcp_xid)); + spin_unlock(&xprt->transport_lock); + return -1; } -out: - if (!(xprt->tcp_flags & XPRT_COPY_DATA)) - xprt_complete_rqst(req->rq_task, xprt->tcp_copied); + xs_tcp_read_common(xprt, desc, req); + + if (!(transport->tcp_flags & TCP_RCV_COPY_DATA)) + xprt_complete_rqst(req->rq_task, transport->tcp_copied); + + spin_unlock(&xprt->transport_lock); + return 0; +} + +#if defined(CONFIG_SUNRPC_BACKCHANNEL) +/* + * Obtains an rpc_rqst previously allocated and invokes the common + * tcp read code to read the data. The result is placed in the callback + * queue. + * If we're unable to obtain the rpc_rqst we schedule the closing of the + * connection and return -1. + */ +static int xs_tcp_read_callback(struct rpc_xprt *xprt, + struct xdr_skb_reader *desc) +{ + struct sock_xprt *transport = + container_of(xprt, struct sock_xprt, xprt); + struct rpc_rqst *req; + + /* Look up and lock the request corresponding to the given XID */ + spin_lock(&xprt->transport_lock); + req = xprt_lookup_bc_request(xprt, transport->tcp_xid); + if (req == NULL) { + spin_unlock(&xprt->transport_lock); + printk(KERN_WARNING "Callback slot table overflowed\n"); + xprt_force_disconnect(xprt); + return -1; + } + + dprintk("RPC: read callback XID %08x\n", ntohl(req->rq_xid)); + xs_tcp_read_common(xprt, desc, req); + + if (!(transport->tcp_flags & TCP_RCV_COPY_DATA)) + xprt_complete_bc_request(req, transport->tcp_copied); spin_unlock(&xprt->transport_lock); - xs_tcp_check_recm(xprt); + + return 0; } -static inline void xs_tcp_read_discard(struct rpc_xprt *xprt, skb_reader_t *desc) +static inline int _xs_tcp_read_data(struct rpc_xprt *xprt, + struct xdr_skb_reader *desc) +{ + struct sock_xprt *transport = + container_of(xprt, struct sock_xprt, xprt); + + return (transport->tcp_flags & TCP_RPC_REPLY) ? + xs_tcp_read_reply(xprt, desc) : + xs_tcp_read_callback(xprt, desc); +} +#else +static inline int _xs_tcp_read_data(struct rpc_xprt *xprt, + struct xdr_skb_reader *desc) +{ + return xs_tcp_read_reply(xprt, desc); +} +#endif /* CONFIG_SUNRPC_BACKCHANNEL */ + +/* + * Read data off the transport. This can be either an RPC_CALL or an + * RPC_REPLY. Relay the processing to helper functions. + */ +static void xs_tcp_read_data(struct rpc_xprt *xprt, + struct xdr_skb_reader *desc) +{ + struct sock_xprt *transport = + container_of(xprt, struct sock_xprt, xprt); + + if (_xs_tcp_read_data(xprt, desc) == 0) + xs_tcp_check_fraghdr(transport); + else { + /* + * The transport_lock protects the request handling. + * There's no need to hold it to update the tcp_flags. + */ + transport->tcp_flags &= ~TCP_RCV_COPY_DATA; + } +} + +static inline void xs_tcp_read_discard(struct sock_xprt *transport, struct xdr_skb_reader *desc) { size_t len; - len = xprt->tcp_reclen - xprt->tcp_offset; + len = transport->tcp_reclen - transport->tcp_offset; if (len > desc->count) len = desc->count; desc->count -= len; desc->offset += len; - xprt->tcp_offset += len; - dprintk("RPC: discarded %Zu bytes\n", len); - xs_tcp_check_recm(xprt); + transport->tcp_offset += len; + dprintk("RPC: discarded %Zu bytes\n", len); + xs_tcp_check_fraghdr(transport); } static int xs_tcp_data_recv(read_descriptor_t *rd_desc, struct sk_buff *skb, unsigned int offset, size_t len) { struct rpc_xprt *xprt = rd_desc->arg.data; - skb_reader_t desc = { + struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); + struct xdr_skb_reader desc = { .skb = skb, .offset = offset, .count = len, - .csum = 0 }; - dprintk("RPC: xs_tcp_data_recv started\n"); + dprintk("RPC: xs_tcp_data_recv started\n"); do { /* Read in a new fragment marker if necessary */ /* Can we ever really expect to get completely empty fragments? */ - if (xprt->tcp_flags & XPRT_COPY_RECM) { + if (transport->tcp_flags & TCP_RCV_COPY_FRAGHDR) { xs_tcp_read_fraghdr(xprt, &desc); continue; } /* Read in the xid if necessary */ - if (xprt->tcp_flags & XPRT_COPY_XID) { - xs_tcp_read_xid(xprt, &desc); + if (transport->tcp_flags & TCP_RCV_COPY_XID) { + xs_tcp_read_xid(transport, &desc); + continue; + } + /* Read in the call/reply flag */ + if (transport->tcp_flags & TCP_RCV_READ_CALLDIR) { + xs_tcp_read_calldir(transport, &desc); continue; } /* Read in the request data */ - if (xprt->tcp_flags & XPRT_COPY_DATA) { - xs_tcp_read_request(xprt, &desc); + if (transport->tcp_flags & TCP_RCV_COPY_DATA) { + xs_tcp_read_data(xprt, &desc); continue; } /* Skip over any trailing bytes on short reads */ - xs_tcp_read_discard(xprt, &desc); + xs_tcp_read_discard(transport, &desc); } while (desc.count); - dprintk("RPC: xs_tcp_data_recv done\n"); + dprintk("RPC: xs_tcp_data_recv done\n"); return len - desc.count; } @@ -736,24 +1435,79 @@ static int xs_tcp_data_recv(read_descriptor_t *rd_desc, struct sk_buff *skb, uns * @bytes: how much data to read * */ -static void xs_tcp_data_ready(struct sock *sk, int bytes) +static void xs_tcp_data_ready(struct sock *sk) { struct rpc_xprt *xprt; read_descriptor_t rd_desc; + int read; - read_lock(&sk->sk_callback_lock); - dprintk("RPC: xs_tcp_data_ready...\n"); + dprintk("RPC: xs_tcp_data_ready...\n"); + + read_lock_bh(&sk->sk_callback_lock); if (!(xprt = xprt_from_sock(sk))) goto out; - if (xprt->shutdown) - goto out; + /* Any data means we had a useful conversation, so + * the we don't need to delay the next reconnect + */ + if (xprt->reestablish_timeout) + xprt->reestablish_timeout = 0; /* We use rd_desc to pass struct xprt to xs_tcp_data_recv */ rd_desc.arg.data = xprt; - rd_desc.count = 65536; - tcp_read_sock(sk, &rd_desc, xs_tcp_data_recv); + do { + rd_desc.count = 65536; + read = tcp_read_sock(sk, &rd_desc, xs_tcp_data_recv); + } while (read > 0); out: - read_unlock(&sk->sk_callback_lock); + read_unlock_bh(&sk->sk_callback_lock); +} + +/* + * Do the equivalent of linger/linger2 handling for dealing with + * broken servers that don't close the socket in a timely + * fashion + */ +static void xs_tcp_schedule_linger_timeout(struct rpc_xprt *xprt, + unsigned long timeout) +{ + struct sock_xprt *transport; + + if (xprt_test_and_set_connecting(xprt)) + return; + set_bit(XPRT_CONNECTION_ABORT, &xprt->state); + transport = container_of(xprt, struct sock_xprt, xprt); + queue_delayed_work(rpciod_workqueue, &transport->connect_worker, + timeout); +} + +static void xs_tcp_cancel_linger_timeout(struct rpc_xprt *xprt) +{ + struct sock_xprt *transport; + + transport = container_of(xprt, struct sock_xprt, xprt); + + if (!test_bit(XPRT_CONNECTION_ABORT, &xprt->state) || + !cancel_delayed_work(&transport->connect_worker)) + return; + clear_bit(XPRT_CONNECTION_ABORT, &xprt->state); + xprt_clear_connecting(xprt); +} + +static void xs_sock_reset_connection_flags(struct rpc_xprt *xprt) +{ + smp_mb__before_atomic(); + clear_bit(XPRT_CONNECTION_ABORT, &xprt->state); + clear_bit(XPRT_CONNECTION_CLOSE, &xprt->state); + clear_bit(XPRT_CLOSE_WAIT, &xprt->state); + clear_bit(XPRT_CLOSING, &xprt->state); + smp_mb__after_atomic(); +} + +static void xs_sock_mark_closed(struct rpc_xprt *xprt) +{ + xs_sock_reset_connection_flags(xprt); + /* Mark transport as closed and wake up all pending tasks */ + xprt_disconnect_done(xprt); } /** @@ -765,38 +1519,90 @@ static void xs_tcp_state_change(struct sock *sk) { struct rpc_xprt *xprt; - read_lock(&sk->sk_callback_lock); + read_lock_bh(&sk->sk_callback_lock); if (!(xprt = xprt_from_sock(sk))) goto out; - dprintk("RPC: xs_tcp_state_change client %p...\n", xprt); - dprintk("RPC: state %x conn %d dead %d zapped %d\n", - sk->sk_state, xprt_connected(xprt), - sock_flag(sk, SOCK_DEAD), - sock_flag(sk, SOCK_ZAPPED)); - + dprintk("RPC: xs_tcp_state_change client %p...\n", xprt); + dprintk("RPC: state %x conn %d dead %d zapped %d sk_shutdown %d\n", + sk->sk_state, xprt_connected(xprt), + sock_flag(sk, SOCK_DEAD), + sock_flag(sk, SOCK_ZAPPED), + sk->sk_shutdown); + + trace_rpc_socket_state_change(xprt, sk->sk_socket); switch (sk->sk_state) { case TCP_ESTABLISHED: - spin_lock_bh(&xprt->transport_lock); + spin_lock(&xprt->transport_lock); if (!xprt_test_and_set_connected(xprt)) { + struct sock_xprt *transport = container_of(xprt, + struct sock_xprt, xprt); + /* Reset TCP record info */ - xprt->tcp_offset = 0; - xprt->tcp_reclen = 0; - xprt->tcp_copied = 0; - xprt->tcp_flags = XPRT_COPY_RECM | XPRT_COPY_XID; - xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; - xprt_wake_pending_tasks(xprt, 0); + transport->tcp_offset = 0; + transport->tcp_reclen = 0; + transport->tcp_copied = 0; + transport->tcp_flags = + TCP_RCV_COPY_FRAGHDR | TCP_RCV_COPY_XID; + xprt->connect_cookie++; + + xprt_wake_pending_tasks(xprt, -EAGAIN); } - spin_unlock_bh(&xprt->transport_lock); + spin_unlock(&xprt->transport_lock); break; - case TCP_SYN_SENT: - case TCP_SYN_RECV: + case TCP_FIN_WAIT1: + /* The client initiated a shutdown of the socket */ + xprt->connect_cookie++; + xprt->reestablish_timeout = 0; + set_bit(XPRT_CLOSING, &xprt->state); + smp_mb__before_atomic(); + clear_bit(XPRT_CONNECTED, &xprt->state); + clear_bit(XPRT_CLOSE_WAIT, &xprt->state); + smp_mb__after_atomic(); + xs_tcp_schedule_linger_timeout(xprt, xs_tcp_fin_timeout); break; - default: - xprt_disconnect(xprt); + case TCP_CLOSE_WAIT: + /* The server initiated a shutdown of the socket */ + xprt->connect_cookie++; + clear_bit(XPRT_CONNECTED, &xprt->state); + xs_tcp_force_close(xprt); + case TCP_CLOSING: + /* + * If the server closed down the connection, make sure that + * we back off before reconnecting + */ + if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO) + xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; + break; + case TCP_LAST_ACK: + set_bit(XPRT_CLOSING, &xprt->state); + xs_tcp_schedule_linger_timeout(xprt, xs_tcp_fin_timeout); + smp_mb__before_atomic(); + clear_bit(XPRT_CONNECTED, &xprt->state); + smp_mb__after_atomic(); break; + case TCP_CLOSE: + xs_tcp_cancel_linger_timeout(xprt); + xs_sock_mark_closed(xprt); } out: - read_unlock(&sk->sk_callback_lock); + read_unlock_bh(&sk->sk_callback_lock); +} + +static void xs_write_space(struct sock *sk) +{ + struct socket *sock; + struct rpc_xprt *xprt; + + if (unlikely(!(sock = sk->sk_socket))) + return; + clear_bit(SOCK_NOSPACE, &sock->flags); + + if (unlikely(!(xprt = xprt_from_sock(sk)))) + return; + if (test_and_clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags) == 0) + return; + + xprt_write_space(xprt); } /** @@ -811,25 +1617,13 @@ static void xs_tcp_state_change(struct sock *sk) */ static void xs_udp_write_space(struct sock *sk) { - read_lock(&sk->sk_callback_lock); + read_lock_bh(&sk->sk_callback_lock); /* from net/core/sock.c:sock_def_write_space */ - if (sock_writeable(sk)) { - struct socket *sock; - struct rpc_xprt *xprt; + if (sock_writeable(sk)) + xs_write_space(sk); - if (unlikely(!(sock = sk->sk_socket))) - goto out; - if (unlikely(!(xprt = xprt_from_sock(sk)))) - goto out; - if (unlikely(!test_and_clear_bit(SOCK_NOSPACE, &sock->flags))) - goto out; - - xprt_write_space(xprt); - } - - out: - read_unlock(&sk->sk_callback_lock); + read_unlock_bh(&sk->sk_callback_lock); } /** @@ -844,38 +1638,27 @@ static void xs_udp_write_space(struct sock *sk) */ static void xs_tcp_write_space(struct sock *sk) { - read_lock(&sk->sk_callback_lock); + read_lock_bh(&sk->sk_callback_lock); /* from net/core/stream.c:sk_stream_write_space */ - if (sk_stream_wspace(sk) >= sk_stream_min_wspace(sk)) { - struct socket *sock; - struct rpc_xprt *xprt; - - if (unlikely(!(sock = sk->sk_socket))) - goto out; - if (unlikely(!(xprt = xprt_from_sock(sk)))) - goto out; - if (unlikely(!test_and_clear_bit(SOCK_NOSPACE, &sock->flags))) - goto out; + if (sk_stream_is_writeable(sk)) + xs_write_space(sk); - xprt_write_space(xprt); - } - - out: - read_unlock(&sk->sk_callback_lock); + read_unlock_bh(&sk->sk_callback_lock); } static void xs_udp_do_set_buffer_size(struct rpc_xprt *xprt) { - struct sock *sk = xprt->inet; + struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); + struct sock *sk = transport->inet; - if (xprt->rcvsize) { + if (transport->rcvsize) { sk->sk_userlocks |= SOCK_RCVBUF_LOCK; - sk->sk_rcvbuf = xprt->rcvsize * xprt->max_reqs * 2; + sk->sk_rcvbuf = transport->rcvsize * xprt->max_reqs * 2; } - if (xprt->sndsize) { + if (transport->sndsize) { sk->sk_userlocks |= SOCK_SNDBUF_LOCK; - sk->sk_sndbuf = xprt->sndsize * xprt->max_reqs * 2; + sk->sk_sndbuf = transport->sndsize * xprt->max_reqs * 2; sk->sk_write_space(sk); } } @@ -890,12 +1673,14 @@ static void xs_udp_do_set_buffer_size(struct rpc_xprt *xprt) */ static void xs_udp_set_buffer_size(struct rpc_xprt *xprt, size_t sndsize, size_t rcvsize) { - xprt->sndsize = 0; + struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); + + transport->sndsize = 0; if (sndsize) - xprt->sndsize = sndsize + 1024; - xprt->rcvsize = 0; + transport->sndsize = sndsize + 1024; + transport->rcvsize = 0; if (rcvsize) - xprt->rcvsize = rcvsize + 1024; + transport->rcvsize = rcvsize + 1024; xs_udp_do_set_buffer_size(xprt); } @@ -906,108 +1691,416 @@ static void xs_udp_set_buffer_size(struct rpc_xprt *xprt, size_t sndsize, size_t * * Adjust the congestion window after a retransmit timeout has occurred. */ -static void xs_udp_timer(struct rpc_task *task) +static void xs_udp_timer(struct rpc_xprt *xprt, struct rpc_task *task) { - xprt_adjust_cwnd(task, -ETIMEDOUT); + xprt_adjust_cwnd(xprt, task, -ETIMEDOUT); } -static int xs_bindresvport(struct rpc_xprt *xprt, struct socket *sock) +static unsigned short xs_get_random_port(void) { - struct sockaddr_in myaddr = { - .sin_family = AF_INET, - }; - int err; - unsigned short port = xprt->port; + unsigned short range = xprt_max_resvport - xprt_min_resvport; + unsigned short rand = (unsigned short) prandom_u32() % range; + return rand + xprt_min_resvport; +} + +/** + * xs_set_port - reset the port number in the remote endpoint address + * @xprt: generic transport + * @port: new port number + * + */ +static void xs_set_port(struct rpc_xprt *xprt, unsigned short port) +{ + dprintk("RPC: setting port for xprt %p to %u\n", xprt, port); + + rpc_set_port(xs_addr(xprt), port); + xs_update_peer_port(xprt); +} + +static unsigned short xs_get_srcport(struct sock_xprt *transport) +{ + unsigned short port = transport->srcport; + + if (port == 0 && transport->xprt.resvport) + port = xs_get_random_port(); + return port; +} +static unsigned short xs_next_srcport(struct sock_xprt *transport, unsigned short port) +{ + if (transport->srcport != 0) + transport->srcport = 0; + if (!transport->xprt.resvport) + return 0; + if (port <= xprt_min_resvport || port > xprt_max_resvport) + return xprt_max_resvport; + return --port; +} +static int xs_bind(struct sock_xprt *transport, struct socket *sock) +{ + struct sockaddr_storage myaddr; + int err, nloop = 0; + unsigned short port = xs_get_srcport(transport); + unsigned short last; + + memcpy(&myaddr, &transport->srcaddr, transport->xprt.addrlen); do { - myaddr.sin_port = htons(port); - err = sock->ops->bind(sock, (struct sockaddr *) &myaddr, - sizeof(myaddr)); + rpc_set_port((struct sockaddr *)&myaddr, port); + err = kernel_bind(sock, (struct sockaddr *)&myaddr, + transport->xprt.addrlen); + if (port == 0) + break; if (err == 0) { - xprt->port = port; - dprintk("RPC: xs_bindresvport bound to port %u\n", - port); - return 0; + transport->srcport = port; + break; } - if (port <= xprt_min_resvport) - port = xprt_max_resvport; - else - port--; - } while (err == -EADDRINUSE && port != xprt->port); - - dprintk("RPC: can't bind to reserved port (%d).\n", -err); + last = port; + port = xs_next_srcport(transport, port); + if (port > last) + nloop++; + } while (err == -EADDRINUSE && nloop != 2); + + if (myaddr.ss_family == AF_INET) + dprintk("RPC: %s %pI4:%u: %s (%d)\n", __func__, + &((struct sockaddr_in *)&myaddr)->sin_addr, + port, err ? "failed" : "ok", err); + else + dprintk("RPC: %s %pI6:%u: %s (%d)\n", __func__, + &((struct sockaddr_in6 *)&myaddr)->sin6_addr, + port, err ? "failed" : "ok", err); return err; } -/** - * xs_udp_connect_worker - set up a UDP socket - * @args: RPC transport to connect - * - * Invoked by a work queue tasklet. +/* + * We don't support autobind on AF_LOCAL sockets */ -static void xs_udp_connect_worker(void *args) +static void xs_local_rpcbind(struct rpc_task *task) { - struct rpc_xprt *xprt = (struct rpc_xprt *) args; - struct socket *sock = xprt->sock; - int err, status = -EIO; + rcu_read_lock(); + xprt_set_bound(rcu_dereference(task->tk_client->cl_xprt)); + rcu_read_unlock(); +} - if (xprt->shutdown || xprt->addr.sin_port == 0) - goto out; +static void xs_local_set_port(struct rpc_xprt *xprt, unsigned short port) +{ +} - dprintk("RPC: xs_udp_connect_worker for xprt %p\n", xprt); +#ifdef CONFIG_DEBUG_LOCK_ALLOC +static struct lock_class_key xs_key[2]; +static struct lock_class_key xs_slock_key[2]; - /* Start by resetting any existing state */ - xs_close(xprt); +static inline void xs_reclassify_socketu(struct socket *sock) +{ + struct sock *sk = sock->sk; + + sock_lock_init_class_and_name(sk, "slock-AF_LOCAL-RPC", + &xs_slock_key[1], "sk_lock-AF_LOCAL-RPC", &xs_key[1]); +} - if ((err = sock_create_kern(PF_INET, SOCK_DGRAM, IPPROTO_UDP, &sock)) < 0) { - dprintk("RPC: can't create UDP transport socket (%d).\n", -err); +static inline void xs_reclassify_socket4(struct socket *sock) +{ + struct sock *sk = sock->sk; + + sock_lock_init_class_and_name(sk, "slock-AF_INET-RPC", + &xs_slock_key[0], "sk_lock-AF_INET-RPC", &xs_key[0]); +} + +static inline void xs_reclassify_socket6(struct socket *sock) +{ + struct sock *sk = sock->sk; + + sock_lock_init_class_and_name(sk, "slock-AF_INET6-RPC", + &xs_slock_key[1], "sk_lock-AF_INET6-RPC", &xs_key[1]); +} + +static inline void xs_reclassify_socket(int family, struct socket *sock) +{ + WARN_ON_ONCE(sock_owned_by_user(sock->sk)); + if (sock_owned_by_user(sock->sk)) + return; + + switch (family) { + case AF_LOCAL: + xs_reclassify_socketu(sock); + break; + case AF_INET: + xs_reclassify_socket4(sock); + break; + case AF_INET6: + xs_reclassify_socket6(sock); + break; + } +} +#else +static inline void xs_reclassify_socketu(struct socket *sock) +{ +} + +static inline void xs_reclassify_socket4(struct socket *sock) +{ +} + +static inline void xs_reclassify_socket6(struct socket *sock) +{ +} + +static inline void xs_reclassify_socket(int family, struct socket *sock) +{ +} +#endif + +static void xs_dummy_setup_socket(struct work_struct *work) +{ +} + +static struct socket *xs_create_sock(struct rpc_xprt *xprt, + struct sock_xprt *transport, int family, int type, int protocol) +{ + struct socket *sock; + int err; + + err = __sock_create(xprt->xprt_net, family, type, protocol, &sock, 1); + if (err < 0) { + dprintk("RPC: can't create %d transport socket (%d).\n", + protocol, -err); goto out; } + xs_reclassify_socket(family, sock); - if (xprt->resvport && xs_bindresvport(xprt, sock) < 0) { + err = xs_bind(transport, sock); + if (err) { sock_release(sock); goto out; } - if (!xprt->inet) { + return sock; +out: + return ERR_PTR(err); +} + +static int xs_local_finish_connecting(struct rpc_xprt *xprt, + struct socket *sock) +{ + struct sock_xprt *transport = container_of(xprt, struct sock_xprt, + xprt); + + if (!transport->inet) { struct sock *sk = sock->sk; write_lock_bh(&sk->sk_callback_lock); + xs_save_old_callbacks(transport, sk); + + sk->sk_user_data = xprt; + sk->sk_data_ready = xs_local_data_ready; + sk->sk_write_space = xs_udp_write_space; + sk->sk_error_report = xs_error_report; + sk->sk_allocation = GFP_ATOMIC; + + xprt_clear_connected(xprt); + + /* Reset to new socket */ + transport->sock = sock; + transport->inet = sk; + + write_unlock_bh(&sk->sk_callback_lock); + } + + /* Tell the socket layer to start connecting... */ + xprt->stat.connect_count++; + xprt->stat.connect_start = jiffies; + return kernel_connect(sock, xs_addr(xprt), xprt->addrlen, 0); +} + +/** + * xs_local_setup_socket - create AF_LOCAL socket, connect to a local endpoint + * @xprt: RPC transport to connect + * @transport: socket transport to connect + * @create_sock: function to create a socket of the correct type + */ +static int xs_local_setup_socket(struct sock_xprt *transport) +{ + struct rpc_xprt *xprt = &transport->xprt; + struct socket *sock; + int status = -EIO; + + current->flags |= PF_FSTRANS; + + clear_bit(XPRT_CONNECTION_ABORT, &xprt->state); + status = __sock_create(xprt->xprt_net, AF_LOCAL, + SOCK_STREAM, 0, &sock, 1); + if (status < 0) { + dprintk("RPC: can't create AF_LOCAL " + "transport socket (%d).\n", -status); + goto out; + } + xs_reclassify_socketu(sock); + + dprintk("RPC: worker connecting xprt %p via AF_LOCAL to %s\n", + xprt, xprt->address_strings[RPC_DISPLAY_ADDR]); + + status = xs_local_finish_connecting(xprt, sock); + trace_rpc_socket_connect(xprt, sock, status); + switch (status) { + case 0: + dprintk("RPC: xprt %p connected to %s\n", + xprt, xprt->address_strings[RPC_DISPLAY_ADDR]); + xprt_set_connected(xprt); + break; + case -ENOENT: + dprintk("RPC: xprt %p: socket %s does not exist\n", + xprt, xprt->address_strings[RPC_DISPLAY_ADDR]); + break; + case -ECONNREFUSED: + dprintk("RPC: xprt %p: connection refused for %s\n", + xprt, xprt->address_strings[RPC_DISPLAY_ADDR]); + break; + default: + printk(KERN_ERR "%s: unhandled error (%d) connecting to %s\n", + __func__, -status, + xprt->address_strings[RPC_DISPLAY_ADDR]); + } + +out: + xprt_clear_connecting(xprt); + xprt_wake_pending_tasks(xprt, status); + current->flags &= ~PF_FSTRANS; + return status; +} + +static void xs_local_connect(struct rpc_xprt *xprt, struct rpc_task *task) +{ + struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); + int ret; + + if (RPC_IS_ASYNC(task)) { + /* + * We want the AF_LOCAL connect to be resolved in the + * filesystem namespace of the process making the rpc + * call. Thus we connect synchronously. + * + * If we want to support asynchronous AF_LOCAL calls, + * we'll need to figure out how to pass a namespace to + * connect. + */ + rpc_exit(task, -ENOTCONN); + return; + } + ret = xs_local_setup_socket(transport); + if (ret && !RPC_IS_SOFTCONN(task)) + msleep_interruptible(15000); +} + +#ifdef CONFIG_SUNRPC_SWAP +static void xs_set_memalloc(struct rpc_xprt *xprt) +{ + struct sock_xprt *transport = container_of(xprt, struct sock_xprt, + xprt); + + if (xprt->swapper) + sk_set_memalloc(transport->inet); +} + +/** + * xs_swapper - Tag this transport as being used for swap. + * @xprt: transport to tag + * @enable: enable/disable + * + */ +int xs_swapper(struct rpc_xprt *xprt, int enable) +{ + struct sock_xprt *transport = container_of(xprt, struct sock_xprt, + xprt); + int err = 0; + + if (enable) { + xprt->swapper++; + xs_set_memalloc(xprt); + } else if (xprt->swapper) { + xprt->swapper--; + sk_clear_memalloc(transport->inet); + } + + return err; +} +EXPORT_SYMBOL_GPL(xs_swapper); +#else +static void xs_set_memalloc(struct rpc_xprt *xprt) +{ +} +#endif + +static void xs_udp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock) +{ + struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); + + if (!transport->inet) { + struct sock *sk = sock->sk; + + write_lock_bh(&sk->sk_callback_lock); + + xs_save_old_callbacks(transport, sk); + sk->sk_user_data = xprt; - xprt->old_data_ready = sk->sk_data_ready; - xprt->old_state_change = sk->sk_state_change; - xprt->old_write_space = sk->sk_write_space; sk->sk_data_ready = xs_udp_data_ready; sk->sk_write_space = xs_udp_write_space; - sk->sk_no_check = UDP_CSUM_NORCV; + sk->sk_allocation = GFP_ATOMIC; xprt_set_connected(xprt); /* Reset to new socket */ - xprt->sock = sock; - xprt->inet = sk; + transport->sock = sock; + transport->inet = sk; + + xs_set_memalloc(xprt); write_unlock_bh(&sk->sk_callback_lock); } xs_udp_do_set_buffer_size(xprt); +} + +static void xs_udp_setup_socket(struct work_struct *work) +{ + struct sock_xprt *transport = + container_of(work, struct sock_xprt, connect_worker.work); + struct rpc_xprt *xprt = &transport->xprt; + struct socket *sock = transport->sock; + int status = -EIO; + + current->flags |= PF_FSTRANS; + + /* Start by resetting any existing state */ + xs_reset_transport(transport); + sock = xs_create_sock(xprt, transport, + xs_addr(xprt)->sa_family, SOCK_DGRAM, IPPROTO_UDP); + if (IS_ERR(sock)) + goto out; + + dprintk("RPC: worker connecting xprt %p via %s to " + "%s (port %s)\n", xprt, + xprt->address_strings[RPC_DISPLAY_PROTO], + xprt->address_strings[RPC_DISPLAY_ADDR], + xprt->address_strings[RPC_DISPLAY_PORT]); + + xs_udp_finish_connecting(xprt, sock); + trace_rpc_socket_connect(xprt, sock, 0); status = 0; out: - xprt_wake_pending_tasks(xprt, status); xprt_clear_connecting(xprt); + xprt_wake_pending_tasks(xprt, status); + current->flags &= ~PF_FSTRANS; } /* * We need to preserve the port number so the reply cache on the server can * find our cached RPC replies when we get around to reconnecting. */ -static void xs_tcp_reuse_connection(struct rpc_xprt *xprt) +static void xs_abort_connection(struct sock_xprt *transport) { int result; - struct socket *sock = xprt->sock; struct sockaddr any; - dprintk("RPC: disconnecting xprt %p to reuse port\n", xprt); + dprintk("RPC: disconnecting xprt %p to reuse port\n", transport); /* * Disconnect the transport socket by doing a connect operation @@ -1015,56 +2108,71 @@ static void xs_tcp_reuse_connection(struct rpc_xprt *xprt) */ memset(&any, 0, sizeof(any)); any.sa_family = AF_UNSPEC; - result = sock->ops->connect(sock, &any, sizeof(any), 0); - if (result) - dprintk("RPC: AF_UNSPEC connect return code %d\n", - result); + result = kernel_connect(transport->sock, &any, sizeof(any), 0); + trace_rpc_socket_reset_connection(&transport->xprt, + transport->sock, result); + if (!result) + xs_sock_reset_connection_flags(&transport->xprt); + dprintk("RPC: AF_UNSPEC connect return code %d\n", result); } -/** - * xs_tcp_connect_worker - connect a TCP socket to a remote endpoint - * @args: RPC transport to connect - * - * Invoked by a work queue tasklet. - */ -static void xs_tcp_connect_worker(void *args) +static void xs_tcp_reuse_connection(struct sock_xprt *transport) { - struct rpc_xprt *xprt = (struct rpc_xprt *)args; - struct socket *sock = xprt->sock; - int err, status = -EIO; + unsigned int state = transport->inet->sk_state; - if (xprt->shutdown || xprt->addr.sin_port == 0) - goto out; - - dprintk("RPC: xs_tcp_connect_worker for xprt %p\n", xprt); - - if (!xprt->sock) { - /* start from scratch */ - if ((err = sock_create_kern(PF_INET, SOCK_STREAM, IPPROTO_TCP, &sock)) < 0) { - dprintk("RPC: can't create TCP transport socket (%d).\n", -err); - goto out; - } + if (state == TCP_CLOSE && transport->sock->state == SS_UNCONNECTED) { + /* we don't need to abort the connection if the socket + * hasn't undergone a shutdown + */ + if (transport->inet->sk_shutdown == 0) + return; + dprintk("RPC: %s: TCP_CLOSEd and sk_shutdown set to %d\n", + __func__, transport->inet->sk_shutdown); + } + if ((1 << state) & (TCPF_ESTABLISHED|TCPF_SYN_SENT)) { + /* we don't need to abort the connection if the socket + * hasn't undergone a shutdown + */ + if (transport->inet->sk_shutdown == 0) + return; + dprintk("RPC: %s: ESTABLISHED/SYN_SENT " + "sk_shutdown set to %d\n", + __func__, transport->inet->sk_shutdown); + } + xs_abort_connection(transport); +} - if (xprt->resvport && xs_bindresvport(xprt, sock) < 0) { - sock_release(sock); - goto out; - } - } else - /* "close" the socket, preserving the local port */ - xs_tcp_reuse_connection(xprt); +static int xs_tcp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock) +{ + struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); + int ret = -ENOTCONN; - if (!xprt->inet) { + if (!transport->inet) { struct sock *sk = sock->sk; + unsigned int keepidle = xprt->timeout->to_initval / HZ; + unsigned int keepcnt = xprt->timeout->to_retries + 1; + unsigned int opt_on = 1; + + /* TCP Keepalive options */ + kernel_setsockopt(sock, SOL_SOCKET, SO_KEEPALIVE, + (char *)&opt_on, sizeof(opt_on)); + kernel_setsockopt(sock, SOL_TCP, TCP_KEEPIDLE, + (char *)&keepidle, sizeof(keepidle)); + kernel_setsockopt(sock, SOL_TCP, TCP_KEEPINTVL, + (char *)&keepidle, sizeof(keepidle)); + kernel_setsockopt(sock, SOL_TCP, TCP_KEEPCNT, + (char *)&keepcnt, sizeof(keepcnt)); write_lock_bh(&sk->sk_callback_lock); + xs_save_old_callbacks(transport, sk); + sk->sk_user_data = xprt; - xprt->old_data_ready = sk->sk_data_ready; - xprt->old_state_change = sk->sk_state_change; - xprt->old_write_space = sk->sk_write_space; sk->sk_data_ready = xs_tcp_data_ready; sk->sk_state_change = xs_tcp_state_change; sk->sk_write_space = xs_tcp_write_space; + sk->sk_error_report = xs_error_report; + sk->sk_allocation = GFP_ATOMIC; /* socket options */ sk->sk_userlocks |= SOCK_BINDPORT_LOCK; @@ -1075,40 +2183,118 @@ static void xs_tcp_connect_worker(void *args) xprt_clear_connected(xprt); /* Reset to new socket */ - xprt->sock = sock; - xprt->inet = sk; + transport->sock = sock; + transport->inet = sk; write_unlock_bh(&sk->sk_callback_lock); } + if (!xprt_bound(xprt)) + goto out; + + xs_set_memalloc(xprt); + /* Tell the socket layer to start connecting... */ - status = sock->ops->connect(sock, (struct sockaddr *) &xprt->addr, - sizeof(xprt->addr), O_NONBLOCK); - dprintk("RPC: %p connect status %d connected %d sock state %d\n", - xprt, -status, xprt_connected(xprt), sock->sk->sk_state); - if (status < 0) { - switch (status) { - case -EINPROGRESS: - case -EALREADY: - goto out_clear; - case -ECONNREFUSED: - case -ECONNRESET: - /* retry with existing socket, after a delay */ - break; - default: - /* get rid of existing socket, and retry */ - xs_close(xprt); - break; + xprt->stat.connect_count++; + xprt->stat.connect_start = jiffies; + ret = kernel_connect(sock, xs_addr(xprt), xprt->addrlen, O_NONBLOCK); + switch (ret) { + case 0: + case -EINPROGRESS: + /* SYN_SENT! */ + if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO) + xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; + } +out: + return ret; +} + +/** + * xs_tcp_setup_socket - create a TCP socket and connect to a remote endpoint + * @xprt: RPC transport to connect + * @transport: socket transport to connect + * @create_sock: function to create a socket of the correct type + * + * Invoked by a work queue tasklet. + */ +static void xs_tcp_setup_socket(struct work_struct *work) +{ + struct sock_xprt *transport = + container_of(work, struct sock_xprt, connect_worker.work); + struct socket *sock = transport->sock; + struct rpc_xprt *xprt = &transport->xprt; + int status = -EIO; + + current->flags |= PF_FSTRANS; + + if (!sock) { + clear_bit(XPRT_CONNECTION_ABORT, &xprt->state); + sock = xs_create_sock(xprt, transport, + xs_addr(xprt)->sa_family, SOCK_STREAM, IPPROTO_TCP); + if (IS_ERR(sock)) { + status = PTR_ERR(sock); + goto out; } + } else { + int abort_and_exit; + + abort_and_exit = test_and_clear_bit(XPRT_CONNECTION_ABORT, + &xprt->state); + /* "close" the socket, preserving the local port */ + xs_tcp_reuse_connection(transport); + + if (abort_and_exit) + goto out_eagain; + } + + dprintk("RPC: worker connecting xprt %p via %s to " + "%s (port %s)\n", xprt, + xprt->address_strings[RPC_DISPLAY_PROTO], + xprt->address_strings[RPC_DISPLAY_ADDR], + xprt->address_strings[RPC_DISPLAY_PORT]); + + status = xs_tcp_finish_connecting(xprt, sock); + trace_rpc_socket_connect(xprt, sock, status); + dprintk("RPC: %p connect status %d connected %d sock state %d\n", + xprt, -status, xprt_connected(xprt), + sock->sk->sk_state); + switch (status) { + default: + printk("%s: connect returned unhandled error %d\n", + __func__, status); + case -EADDRNOTAVAIL: + /* We're probably in TIME_WAIT. Get rid of existing socket, + * and retry + */ + xs_tcp_force_close(xprt); + break; + case 0: + case -EINPROGRESS: + case -EALREADY: + xprt_clear_connecting(xprt); + current->flags &= ~PF_FSTRANS; + return; + case -EINVAL: + /* Happens, for instance, if the user specified a link + * local IPv6 address without a scope-id. + */ + case -ECONNREFUSED: + case -ECONNRESET: + case -ENETUNREACH: + /* retry with existing socket, after a delay */ + goto out; } +out_eagain: + status = -EAGAIN; out: - xprt_wake_pending_tasks(xprt, status); -out_clear: xprt_clear_connecting(xprt); + xprt_wake_pending_tasks(xprt, status); + current->flags &= ~PF_FSTRANS; } /** * xs_connect - connect a socket to a remote endpoint + * @xprt: pointer to transport structure * @task: address of RPC task that manages state of connect request * * TCP: If the remote end dropped the connection, delay reconnecting. @@ -1120,133 +2306,820 @@ out_clear: * If a UDP socket connect fails, the delay behavior here prevents * retry floods (hard mounts). */ -static void xs_connect(struct rpc_task *task) +static void xs_connect(struct rpc_xprt *xprt, struct rpc_task *task) { - struct rpc_xprt *xprt = task->tk_xprt; + struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); - if (xprt_test_and_set_connecting(xprt)) - return; - - if (xprt->sock != NULL) { - dprintk("RPC: xs_connect delayed xprt %p for %lu seconds\n", + if (transport->sock != NULL && !RPC_IS_SOFTCONN(task)) { + dprintk("RPC: xs_connect delayed xprt %p for %lu " + "seconds\n", xprt, xprt->reestablish_timeout / HZ); - schedule_delayed_work(&xprt->connect_worker, - xprt->reestablish_timeout); + queue_delayed_work(rpciod_workqueue, + &transport->connect_worker, + xprt->reestablish_timeout); xprt->reestablish_timeout <<= 1; + if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO) + xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; if (xprt->reestablish_timeout > XS_TCP_MAX_REEST_TO) xprt->reestablish_timeout = XS_TCP_MAX_REEST_TO; } else { - dprintk("RPC: xs_connect scheduled xprt %p\n", xprt); - schedule_work(&xprt->connect_worker); + dprintk("RPC: xs_connect scheduled xprt %p\n", xprt); + queue_delayed_work(rpciod_workqueue, + &transport->connect_worker, 0); + } +} + +/** + * xs_local_print_stats - display AF_LOCAL socket-specifc stats + * @xprt: rpc_xprt struct containing statistics + * @seq: output file + * + */ +static void xs_local_print_stats(struct rpc_xprt *xprt, struct seq_file *seq) +{ + long idle_time = 0; + + if (xprt_connected(xprt)) + idle_time = (long)(jiffies - xprt->last_used) / HZ; + + seq_printf(seq, "\txprt:\tlocal %lu %lu %lu %ld %lu %lu %lu " + "%llu %llu %lu %llu %llu\n", + 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, + xprt->stat.max_slots, + xprt->stat.sending_u, + xprt->stat.pending_u); +} - /* flush_scheduled_work can sleep... */ - if (!RPC_IS_ASYNC(task)) - flush_scheduled_work(); +/** + * xs_udp_print_stats - display UDP socket-specifc stats + * @xprt: rpc_xprt struct containing statistics + * @seq: output file + * + */ +static void xs_udp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq) +{ + struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); + + seq_printf(seq, "\txprt:\tudp %u %lu %lu %lu %lu %llu %llu " + "%lu %llu %llu\n", + transport->srcport, + xprt->stat.bind_count, + xprt->stat.sends, + xprt->stat.recvs, + xprt->stat.bad_xids, + xprt->stat.req_u, + xprt->stat.bklog_u, + xprt->stat.max_slots, + xprt->stat.sending_u, + xprt->stat.pending_u); +} + +/** + * xs_tcp_print_stats - display TCP socket-specifc stats + * @xprt: rpc_xprt struct containing statistics + * @seq: output file + * + */ +static void xs_tcp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq) +{ + struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); + long idle_time = 0; + + if (xprt_connected(xprt)) + idle_time = (long)(jiffies - xprt->last_used) / HZ; + + seq_printf(seq, "\txprt:\ttcp %u %lu %lu %lu %ld %lu %lu %lu " + "%llu %llu %lu %llu %llu\n", + transport->srcport, + 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, + xprt->stat.max_slots, + xprt->stat.sending_u, + xprt->stat.pending_u); +} + +/* + * Allocate a bunch of pages for a scratch buffer for the rpc code. The reason + * we allocate pages instead doing a kmalloc like rpc_malloc is because we want + * to use the server side send routines. + */ +static void *bc_malloc(struct rpc_task *task, size_t size) +{ + struct page *page; + struct rpc_buffer *buf; + + WARN_ON_ONCE(size > PAGE_SIZE - sizeof(struct rpc_buffer)); + if (size > PAGE_SIZE - sizeof(struct rpc_buffer)) + return NULL; + + page = alloc_page(GFP_KERNEL); + if (!page) + return NULL; + + buf = page_address(page); + buf->len = PAGE_SIZE; + + return buf->data; +} + +/* + * Free the space allocated in the bc_alloc routine + */ +static void bc_free(void *buffer) +{ + struct rpc_buffer *buf; + + if (!buffer) + return; + + buf = container_of(buffer, struct rpc_buffer, data); + free_page((unsigned long)buf); +} + +/* + * Use the svc_sock to send the callback. Must be called with svsk->sk_mutex + * held. Borrows heavily from svc_tcp_sendto and xs_tcp_send_request. + */ +static int bc_sendto(struct rpc_rqst *req) +{ + int len; + struct xdr_buf *xbufp = &req->rq_snd_buf; + struct rpc_xprt *xprt = req->rq_xprt; + struct sock_xprt *transport = + container_of(xprt, struct sock_xprt, xprt); + struct socket *sock = transport->sock; + unsigned long headoff; + unsigned long tailoff; + + xs_encode_stream_record_marker(xbufp); + + tailoff = (unsigned long)xbufp->tail[0].iov_base & ~PAGE_MASK; + headoff = (unsigned long)xbufp->head[0].iov_base & ~PAGE_MASK; + len = svc_send_common(sock, xbufp, + virt_to_page(xbufp->head[0].iov_base), headoff, + xbufp->tail[0].iov_base, tailoff); + + if (len != xbufp->len) { + printk(KERN_NOTICE "Error sending entire callback!\n"); + len = -EAGAIN; + } + + return len; +} + +/* + * The send routine. Borrows from svc_send + */ +static int bc_send_request(struct rpc_task *task) +{ + struct rpc_rqst *req = task->tk_rqstp; + struct svc_xprt *xprt; + u32 len; + + dprintk("sending request with xid: %08x\n", ntohl(req->rq_xid)); + /* + * Get the server socket associated with this callback xprt + */ + xprt = req->rq_xprt->bc_xprt; + + /* + * Grab the mutex to serialize data as the connection is shared + * with the fore channel + */ + if (!mutex_trylock(&xprt->xpt_mutex)) { + rpc_sleep_on(&xprt->xpt_bc_pending, task, NULL); + if (!mutex_trylock(&xprt->xpt_mutex)) + return -EAGAIN; + rpc_wake_up_queued_task(&xprt->xpt_bc_pending, task); } + if (test_bit(XPT_DEAD, &xprt->xpt_flags)) + len = -ENOTCONN; + else + len = bc_sendto(req); + mutex_unlock(&xprt->xpt_mutex); + + if (len > 0) + len = 0; + + return len; +} + +/* + * The close routine. Since this is client initiated, we do nothing + */ + +static void bc_close(struct rpc_xprt *xprt) +{ +} + +/* + * The xprt destroy routine. Again, because this connection is client + * initiated, we do nothing + */ + +static void bc_destroy(struct rpc_xprt *xprt) +{ + dprintk("RPC: bc_destroy xprt %p\n", xprt); + + xs_xprt_free(xprt); + module_put(THIS_MODULE); } +static struct rpc_xprt_ops xs_local_ops = { + .reserve_xprt = xprt_reserve_xprt, + .release_xprt = xs_tcp_release_xprt, + .alloc_slot = xprt_alloc_slot, + .rpcbind = xs_local_rpcbind, + .set_port = xs_local_set_port, + .connect = xs_local_connect, + .buf_alloc = rpc_malloc, + .buf_free = rpc_free, + .send_request = xs_local_send_request, + .set_retrans_timeout = xprt_set_retrans_timeout_def, + .close = xs_close, + .destroy = xs_destroy, + .print_stats = xs_local_print_stats, +}; + static struct rpc_xprt_ops xs_udp_ops = { .set_buffer_size = xs_udp_set_buffer_size, .reserve_xprt = xprt_reserve_xprt_cong, .release_xprt = xprt_release_xprt_cong, + .alloc_slot = xprt_alloc_slot, + .rpcbind = rpcb_getport_async, + .set_port = xs_set_port, .connect = xs_connect, + .buf_alloc = rpc_malloc, + .buf_free = rpc_free, .send_request = xs_udp_send_request, .set_retrans_timeout = xprt_set_retrans_timeout_rtt, .timer = xs_udp_timer, .release_request = xprt_release_rqst_cong, .close = xs_close, .destroy = xs_destroy, + .print_stats = xs_udp_print_stats, }; static struct rpc_xprt_ops xs_tcp_ops = { .reserve_xprt = xprt_reserve_xprt, - .release_xprt = xprt_release_xprt, + .release_xprt = xs_tcp_release_xprt, + .alloc_slot = xprt_lock_and_alloc_slot, + .rpcbind = rpcb_getport_async, + .set_port = xs_set_port, .connect = xs_connect, + .buf_alloc = rpc_malloc, + .buf_free = rpc_free, .send_request = xs_tcp_send_request, .set_retrans_timeout = xprt_set_retrans_timeout_def, - .close = xs_close, + .close = xs_tcp_close, .destroy = xs_destroy, + .print_stats = xs_tcp_print_stats, +}; + +/* + * The rpc_xprt_ops for the server backchannel + */ + +static struct rpc_xprt_ops bc_tcp_ops = { + .reserve_xprt = xprt_reserve_xprt, + .release_xprt = xprt_release_xprt, + .alloc_slot = xprt_alloc_slot, + .buf_alloc = bc_malloc, + .buf_free = bc_free, + .send_request = bc_send_request, + .set_retrans_timeout = xprt_set_retrans_timeout_def, + .close = bc_close, + .destroy = bc_destroy, + .print_stats = xs_tcp_print_stats, +}; + +static int xs_init_anyaddr(const int family, struct sockaddr *sap) +{ + static const struct sockaddr_in sin = { + .sin_family = AF_INET, + .sin_addr.s_addr = htonl(INADDR_ANY), + }; + static const struct sockaddr_in6 sin6 = { + .sin6_family = AF_INET6, + .sin6_addr = IN6ADDR_ANY_INIT, + }; + + switch (family) { + case AF_LOCAL: + break; + case AF_INET: + memcpy(sap, &sin, sizeof(sin)); + break; + case AF_INET6: + memcpy(sap, &sin6, sizeof(sin6)); + break; + default: + dprintk("RPC: %s: Bad address family\n", __func__); + return -EAFNOSUPPORT; + } + return 0; +} + +static struct rpc_xprt *xs_setup_xprt(struct xprt_create *args, + unsigned int slot_table_size, + unsigned int max_slot_table_size) +{ + struct rpc_xprt *xprt; + struct sock_xprt *new; + + if (args->addrlen > sizeof(xprt->addr)) { + dprintk("RPC: xs_setup_xprt: address too large\n"); + return ERR_PTR(-EBADF); + } + + xprt = xprt_alloc(args->net, sizeof(*new), slot_table_size, + max_slot_table_size); + if (xprt == NULL) { + dprintk("RPC: xs_setup_xprt: couldn't allocate " + "rpc_xprt\n"); + return ERR_PTR(-ENOMEM); + } + + new = container_of(xprt, struct sock_xprt, xprt); + memcpy(&xprt->addr, args->dstaddr, args->addrlen); + xprt->addrlen = args->addrlen; + if (args->srcaddr) + memcpy(&new->srcaddr, args->srcaddr, args->addrlen); + else { + int err; + err = xs_init_anyaddr(args->dstaddr->sa_family, + (struct sockaddr *)&new->srcaddr); + if (err != 0) { + xprt_free(xprt); + return ERR_PTR(err); + } + } + + return xprt; +} + +static const struct rpc_timeout xs_local_default_timeout = { + .to_initval = 10 * HZ, + .to_maxval = 10 * HZ, + .to_retries = 2, }; /** - * xs_setup_udp - Set up transport to use a UDP socket - * @xprt: transport to set up - * @to: timeout parameters + * xs_setup_local - Set up transport to use an AF_LOCAL socket + * @args: rpc transport creation arguments * + * AF_LOCAL is a "tpi_cots_ord" transport, just like TCP */ -int xs_setup_udp(struct rpc_xprt *xprt, struct rpc_timeout *to) +static struct rpc_xprt *xs_setup_local(struct xprt_create *args) { - size_t slot_table_size; + struct sockaddr_un *sun = (struct sockaddr_un *)args->dstaddr; + struct sock_xprt *transport; + struct rpc_xprt *xprt; + struct rpc_xprt *ret; + + xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries, + xprt_max_tcp_slot_table_entries); + if (IS_ERR(xprt)) + return xprt; + transport = container_of(xprt, struct sock_xprt, xprt); + + xprt->prot = 0; + xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32); + xprt->max_payload = RPC_MAX_FRAGMENT_SIZE; + + xprt->bind_timeout = XS_BIND_TO; + xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; + xprt->idle_timeout = XS_IDLE_DISC_TO; + + xprt->ops = &xs_local_ops; + xprt->timeout = &xs_local_default_timeout; + + INIT_DELAYED_WORK(&transport->connect_worker, + xs_dummy_setup_socket); + + switch (sun->sun_family) { + case AF_LOCAL: + if (sun->sun_path[0] != '/') { + dprintk("RPC: bad AF_LOCAL address: %s\n", + sun->sun_path); + ret = ERR_PTR(-EINVAL); + goto out_err; + } + xprt_set_bound(xprt); + xs_format_peer_addresses(xprt, "local", RPCBIND_NETID_LOCAL); + ret = ERR_PTR(xs_local_setup_socket(transport)); + if (ret) + goto out_err; + break; + default: + ret = ERR_PTR(-EAFNOSUPPORT); + goto out_err; + } + + dprintk("RPC: set up xprt to %s via AF_LOCAL\n", + xprt->address_strings[RPC_DISPLAY_ADDR]); - dprintk("RPC: setting up udp-ipv4 transport...\n"); + if (try_module_get(THIS_MODULE)) + return xprt; + ret = ERR_PTR(-EINVAL); +out_err: + xs_xprt_free(xprt); + return ret; +} - xprt->max_reqs = xprt_udp_slot_table_entries; - slot_table_size = xprt->max_reqs * sizeof(xprt->slot[0]); - xprt->slot = kmalloc(slot_table_size, GFP_KERNEL); - if (xprt->slot == NULL) - return -ENOMEM; - memset(xprt->slot, 0, slot_table_size); +static const struct rpc_timeout xs_udp_default_timeout = { + .to_initval = 5 * HZ, + .to_maxval = 30 * HZ, + .to_increment = 5 * HZ, + .to_retries = 5, +}; + +/** + * xs_setup_udp - Set up transport to use a UDP socket + * @args: rpc transport creation arguments + * + */ +static struct rpc_xprt *xs_setup_udp(struct xprt_create *args) +{ + struct sockaddr *addr = args->dstaddr; + struct rpc_xprt *xprt; + struct sock_xprt *transport; + struct rpc_xprt *ret; + + xprt = xs_setup_xprt(args, xprt_udp_slot_table_entries, + xprt_udp_slot_table_entries); + if (IS_ERR(xprt)) + return xprt; + transport = container_of(xprt, struct sock_xprt, xprt); xprt->prot = IPPROTO_UDP; - xprt->port = xprt_max_resvport; xprt->tsh_size = 0; - xprt->resvport = capable(CAP_NET_BIND_SERVICE) ? 1 : 0; /* XXX: header size can vary due to auth type, IPv6, etc. */ xprt->max_payload = (1U << 16) - (MAX_HEADER << 3); - INIT_WORK(&xprt->connect_worker, xs_udp_connect_worker, xprt); xprt->bind_timeout = XS_BIND_TO; - xprt->connect_timeout = XS_UDP_CONN_TO; xprt->reestablish_timeout = XS_UDP_REEST_TO; xprt->idle_timeout = XS_IDLE_DISC_TO; xprt->ops = &xs_udp_ops; - if (to) - xprt->timeout = *to; - else - xprt_set_timeout(&xprt->timeout, 5, 5 * HZ); + xprt->timeout = &xs_udp_default_timeout; - return 0; + switch (addr->sa_family) { + case AF_INET: + if (((struct sockaddr_in *)addr)->sin_port != htons(0)) + xprt_set_bound(xprt); + + INIT_DELAYED_WORK(&transport->connect_worker, + xs_udp_setup_socket); + xs_format_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP); + break; + case AF_INET6: + if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0)) + xprt_set_bound(xprt); + + INIT_DELAYED_WORK(&transport->connect_worker, + xs_udp_setup_socket); + xs_format_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP6); + break; + default: + ret = ERR_PTR(-EAFNOSUPPORT); + goto out_err; + } + + if (xprt_bound(xprt)) + dprintk("RPC: set up xprt to %s (port %s) via %s\n", + xprt->address_strings[RPC_DISPLAY_ADDR], + xprt->address_strings[RPC_DISPLAY_PORT], + xprt->address_strings[RPC_DISPLAY_PROTO]); + else + dprintk("RPC: set up xprt to %s (autobind) via %s\n", + xprt->address_strings[RPC_DISPLAY_ADDR], + xprt->address_strings[RPC_DISPLAY_PROTO]); + + if (try_module_get(THIS_MODULE)) + return xprt; + ret = ERR_PTR(-EINVAL); +out_err: + xs_xprt_free(xprt); + return ret; } +static const struct rpc_timeout xs_tcp_default_timeout = { + .to_initval = 60 * HZ, + .to_maxval = 60 * HZ, + .to_retries = 2, +}; + /** * xs_setup_tcp - Set up transport to use a TCP socket - * @xprt: transport to set up - * @to: timeout parameters + * @args: rpc transport creation arguments * */ -int xs_setup_tcp(struct rpc_xprt *xprt, struct rpc_timeout *to) +static struct rpc_xprt *xs_setup_tcp(struct xprt_create *args) { - size_t slot_table_size; + struct sockaddr *addr = args->dstaddr; + struct rpc_xprt *xprt; + struct sock_xprt *transport; + struct rpc_xprt *ret; + unsigned int max_slot_table_size = xprt_max_tcp_slot_table_entries; - dprintk("RPC: setting up tcp-ipv4 transport...\n"); + if (args->flags & XPRT_CREATE_INFINITE_SLOTS) + max_slot_table_size = RPC_MAX_SLOT_TABLE_LIMIT; - xprt->max_reqs = xprt_tcp_slot_table_entries; - slot_table_size = xprt->max_reqs * sizeof(xprt->slot[0]); - xprt->slot = kmalloc(slot_table_size, GFP_KERNEL); - if (xprt->slot == NULL) - return -ENOMEM; - memset(xprt->slot, 0, slot_table_size); + xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries, + max_slot_table_size); + if (IS_ERR(xprt)) + return xprt; + transport = container_of(xprt, struct sock_xprt, xprt); xprt->prot = IPPROTO_TCP; - xprt->port = xprt_max_resvport; xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32); - xprt->resvport = capable(CAP_NET_BIND_SERVICE) ? 1 : 0; xprt->max_payload = RPC_MAX_FRAGMENT_SIZE; - INIT_WORK(&xprt->connect_worker, xs_tcp_connect_worker, xprt); xprt->bind_timeout = XS_BIND_TO; - xprt->connect_timeout = XS_TCP_CONN_TO; xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; xprt->idle_timeout = XS_IDLE_DISC_TO; xprt->ops = &xs_tcp_ops; + xprt->timeout = &xs_tcp_default_timeout; + + switch (addr->sa_family) { + case AF_INET: + if (((struct sockaddr_in *)addr)->sin_port != htons(0)) + xprt_set_bound(xprt); + + INIT_DELAYED_WORK(&transport->connect_worker, + xs_tcp_setup_socket); + xs_format_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP); + break; + case AF_INET6: + if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0)) + xprt_set_bound(xprt); + + INIT_DELAYED_WORK(&transport->connect_worker, + xs_tcp_setup_socket); + xs_format_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP6); + break; + default: + ret = ERR_PTR(-EAFNOSUPPORT); + goto out_err; + } - if (to) - xprt->timeout = *to; + if (xprt_bound(xprt)) + dprintk("RPC: set up xprt to %s (port %s) via %s\n", + xprt->address_strings[RPC_DISPLAY_ADDR], + xprt->address_strings[RPC_DISPLAY_PORT], + xprt->address_strings[RPC_DISPLAY_PROTO]); else - xprt_set_timeout(&xprt->timeout, 2, 60 * HZ); + dprintk("RPC: set up xprt to %s (autobind) via %s\n", + xprt->address_strings[RPC_DISPLAY_ADDR], + xprt->address_strings[RPC_DISPLAY_PROTO]); + + if (try_module_get(THIS_MODULE)) + return xprt; + ret = ERR_PTR(-EINVAL); +out_err: + xs_xprt_free(xprt); + return ret; +} + +/** + * xs_setup_bc_tcp - Set up transport to use a TCP backchannel socket + * @args: rpc transport creation arguments + * + */ +static struct rpc_xprt *xs_setup_bc_tcp(struct xprt_create *args) +{ + struct sockaddr *addr = args->dstaddr; + struct rpc_xprt *xprt; + struct sock_xprt *transport; + struct svc_sock *bc_sock; + struct rpc_xprt *ret; + + xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries, + xprt_tcp_slot_table_entries); + if (IS_ERR(xprt)) + return xprt; + transport = container_of(xprt, struct sock_xprt, xprt); + + xprt->prot = IPPROTO_TCP; + xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32); + xprt->max_payload = RPC_MAX_FRAGMENT_SIZE; + xprt->timeout = &xs_tcp_default_timeout; + + /* backchannel */ + xprt_set_bound(xprt); + xprt->bind_timeout = 0; + xprt->reestablish_timeout = 0; + xprt->idle_timeout = 0; + + xprt->ops = &bc_tcp_ops; + + switch (addr->sa_family) { + case AF_INET: + xs_format_peer_addresses(xprt, "tcp", + RPCBIND_NETID_TCP); + break; + case AF_INET6: + xs_format_peer_addresses(xprt, "tcp", + RPCBIND_NETID_TCP6); + break; + default: + ret = ERR_PTR(-EAFNOSUPPORT); + goto out_err; + } + + dprintk("RPC: set up xprt to %s (port %s) via %s\n", + xprt->address_strings[RPC_DISPLAY_ADDR], + xprt->address_strings[RPC_DISPLAY_PORT], + xprt->address_strings[RPC_DISPLAY_PROTO]); + + /* + * Once we've associated a backchannel xprt with a connection, + * we want to keep it around as long as the connection lasts, + * in case we need to start using it for a backchannel again; + * this reference won't be dropped until bc_xprt is destroyed. + */ + xprt_get(xprt); + args->bc_xprt->xpt_bc_xprt = xprt; + xprt->bc_xprt = args->bc_xprt; + bc_sock = container_of(args->bc_xprt, struct svc_sock, sk_xprt); + transport->sock = bc_sock->sk_sock; + transport->inet = bc_sock->sk_sk; + /* + * Since we don't want connections for the backchannel, we set + * the xprt status to connected + */ + xprt_set_connected(xprt); + + if (try_module_get(THIS_MODULE)) + return xprt; + + args->bc_xprt->xpt_bc_xprt = NULL; + xprt_put(xprt); + ret = ERR_PTR(-EINVAL); +out_err: + xs_xprt_free(xprt); + return ret; +} + +static struct xprt_class xs_local_transport = { + .list = LIST_HEAD_INIT(xs_local_transport.list), + .name = "named UNIX socket", + .owner = THIS_MODULE, + .ident = XPRT_TRANSPORT_LOCAL, + .setup = xs_setup_local, +}; + +static struct xprt_class xs_udp_transport = { + .list = LIST_HEAD_INIT(xs_udp_transport.list), + .name = "udp", + .owner = THIS_MODULE, + .ident = XPRT_TRANSPORT_UDP, + .setup = xs_setup_udp, +}; + +static struct xprt_class xs_tcp_transport = { + .list = LIST_HEAD_INIT(xs_tcp_transport.list), + .name = "tcp", + .owner = THIS_MODULE, + .ident = XPRT_TRANSPORT_TCP, + .setup = xs_setup_tcp, +}; + +static struct xprt_class xs_bc_tcp_transport = { + .list = LIST_HEAD_INIT(xs_bc_tcp_transport.list), + .name = "tcp NFSv4.1 backchannel", + .owner = THIS_MODULE, + .ident = XPRT_TRANSPORT_BC_TCP, + .setup = xs_setup_bc_tcp, +}; + +/** + * init_socket_xprt - set up xprtsock's sysctls, register with RPC client + * + */ +int init_socket_xprt(void) +{ +#ifdef RPC_DEBUG + if (!sunrpc_table_header) + sunrpc_table_header = register_sysctl_table(sunrpc_table); +#endif + + xprt_register_transport(&xs_local_transport); + xprt_register_transport(&xs_udp_transport); + xprt_register_transport(&xs_tcp_transport); + xprt_register_transport(&xs_bc_tcp_transport); + + return 0; +} + +/** + * cleanup_socket_xprt - remove xprtsock's sysctls, unregister + * + */ +void cleanup_socket_xprt(void) +{ +#ifdef RPC_DEBUG + if (sunrpc_table_header) { + unregister_sysctl_table(sunrpc_table_header); + sunrpc_table_header = NULL; + } +#endif + + xprt_unregister_transport(&xs_local_transport); + xprt_unregister_transport(&xs_udp_transport); + xprt_unregister_transport(&xs_tcp_transport); + xprt_unregister_transport(&xs_bc_tcp_transport); +} + +static int param_set_uint_minmax(const char *val, + const struct kernel_param *kp, + unsigned int min, unsigned int max) +{ + unsigned long num; + int ret; + + if (!val) + return -EINVAL; + ret = strict_strtoul(val, 0, &num); + if (ret == -EINVAL || num < min || num > max) + return -EINVAL; + *((unsigned int *)kp->arg) = num; return 0; } + +static int param_set_portnr(const char *val, const struct kernel_param *kp) +{ + return param_set_uint_minmax(val, kp, + RPC_MIN_RESVPORT, + RPC_MAX_RESVPORT); +} + +static struct kernel_param_ops param_ops_portnr = { + .set = param_set_portnr, + .get = param_get_uint, +}; + +#define param_check_portnr(name, p) \ + __param_check(name, p, unsigned int); + +module_param_named(min_resvport, xprt_min_resvport, portnr, 0644); +module_param_named(max_resvport, xprt_max_resvport, portnr, 0644); + +static int param_set_slot_table_size(const char *val, + const struct kernel_param *kp) +{ + return param_set_uint_minmax(val, kp, + RPC_MIN_SLOT_TABLE, + RPC_MAX_SLOT_TABLE); +} + +static struct kernel_param_ops param_ops_slot_table_size = { + .set = param_set_slot_table_size, + .get = param_get_uint, +}; + +#define param_check_slot_table_size(name, p) \ + __param_check(name, p, unsigned int); + +static int param_set_max_slot_table_size(const char *val, + const struct kernel_param *kp) +{ + return param_set_uint_minmax(val, kp, + RPC_MIN_SLOT_TABLE, + RPC_MAX_SLOT_TABLE_LIMIT); +} + +static struct kernel_param_ops param_ops_max_slot_table_size = { + .set = param_set_max_slot_table_size, + .get = param_get_uint, +}; + +#define param_check_max_slot_table_size(name, p) \ + __param_check(name, p, unsigned int); + +module_param_named(tcp_slot_table_entries, xprt_tcp_slot_table_entries, + slot_table_size, 0644); +module_param_named(tcp_max_slot_table_entries, xprt_max_tcp_slot_table_entries, + max_slot_table_size, 0644); +module_param_named(udp_slot_table_entries, xprt_udp_slot_table_entries, + slot_table_size, 0644); + |