diff options
author | Chuck Lever <chuck.lever@oracle.com> | 2020-03-02 21:19:54 +0100 |
---|---|---|
committer | Chuck Lever <chuck.lever@oracle.com> | 2020-03-16 17:04:33 +0100 |
commit | 9e55eef4ab1bf1810443bb3989a07a68e1f5d084 (patch) | |
tree | 29520495c647a180212e3837b8c7ddc923fee422 /net/sunrpc | |
parent | svcrdma: Avoid DMA mapping small RPC Replies (diff) | |
download | linux-9e55eef4ab1bf1810443bb3989a07a68e1f5d084.tar.xz linux-9e55eef4ab1bf1810443bb3989a07a68e1f5d084.zip |
SUNRPC: Refactor xs_sendpages()
Re-locate xs_sendpages() so that it can be shared with server code.
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Diffstat (limited to 'net/sunrpc')
-rw-r--r-- | net/sunrpc/socklib.c | 141 | ||||
-rw-r--r-- | net/sunrpc/socklib.h | 15 | ||||
-rw-r--r-- | net/sunrpc/svcsock.c | 1 | ||||
-rw-r--r-- | net/sunrpc/xprtsock.c | 149 |
4 files changed, 177 insertions, 129 deletions
diff --git a/net/sunrpc/socklib.c b/net/sunrpc/socklib.c index 1a864f1ed119..3fc8af8bb961 100644 --- a/net/sunrpc/socklib.c +++ b/net/sunrpc/socklib.c @@ -14,9 +14,24 @@ #include <linux/types.h> #include <linux/pagemap.h> #include <linux/udp.h> +#include <linux/sunrpc/msg_prot.h> #include <linux/sunrpc/xdr.h> #include <linux/export.h> +#include "socklib.h" + +/* + * Helper structure for copying from an sk_buff. + */ +struct xdr_skb_reader { + struct sk_buff *skb; + unsigned int offset; + size_t count; + __wsum csum; +}; + +typedef size_t (*xdr_skb_read_actor)(struct xdr_skb_reader *desc, void *to, + size_t len); /** * xdr_skb_read_bits - copy some data bits from skb to internal buffer @@ -186,3 +201,129 @@ no_checksum: return 0; } EXPORT_SYMBOL_GPL(csum_partial_copy_to_xdr); + +static inline int xprt_sendmsg(struct socket *sock, struct msghdr *msg, + size_t seek) +{ + if (seek) + iov_iter_advance(&msg->msg_iter, seek); + return sock_sendmsg(sock, msg); +} + +static int xprt_send_kvec(struct socket *sock, struct msghdr *msg, + struct kvec *vec, size_t seek) +{ + iov_iter_kvec(&msg->msg_iter, WRITE, vec, 1, vec->iov_len); + return xprt_sendmsg(sock, msg, seek); +} + +static int xprt_send_pagedata(struct socket *sock, struct msghdr *msg, + struct xdr_buf *xdr, size_t base) +{ + int err; + + err = xdr_alloc_bvec(xdr, GFP_KERNEL); + if (err < 0) + return err; + + iov_iter_bvec(&msg->msg_iter, WRITE, xdr->bvec, xdr_buf_pagecount(xdr), + xdr->page_len + xdr->page_base); + return xprt_sendmsg(sock, msg, base + xdr->page_base); +} + +/* Common case: + * - stream transport + * - sending from byte 0 of the message + * - the message is wholly contained in @xdr's head iovec + */ +static int xprt_send_rm_and_kvec(struct socket *sock, struct msghdr *msg, + rpc_fraghdr marker, struct kvec *vec, + size_t base) +{ + struct kvec iov[2] = { + [0] = { + .iov_base = &marker, + .iov_len = sizeof(marker) + }, + [1] = *vec, + }; + size_t len = iov[0].iov_len + iov[1].iov_len; + + iov_iter_kvec(&msg->msg_iter, WRITE, iov, 2, len); + return xprt_sendmsg(sock, msg, base); +} + +/** + * xprt_sock_sendmsg - write an xdr_buf directly to a socket + * @sock: open socket to send on + * @msg: socket message metadata + * @xdr: xdr_buf containing this request + * @base: starting position in the buffer + * @marker: stream record marker field + * @sent_p: return the total number of bytes successfully queued for sending + * + * Return values: + * On success, returns zero and fills in @sent_p. + * %-ENOTSOCK if @sock is not a struct socket. + */ +int xprt_sock_sendmsg(struct socket *sock, struct msghdr *msg, + struct xdr_buf *xdr, unsigned int base, + rpc_fraghdr marker, unsigned int *sent_p) +{ + unsigned int rmsize = marker ? sizeof(marker) : 0; + unsigned int remainder = rmsize + xdr->len - base; + unsigned int want; + int err = 0; + + *sent_p = 0; + + if (unlikely(!sock)) + return -ENOTSOCK; + + msg->msg_flags |= MSG_MORE; + want = xdr->head[0].iov_len + rmsize; + if (base < want) { + unsigned int len = want - base; + + remainder -= len; + if (remainder == 0) + msg->msg_flags &= ~MSG_MORE; + if (rmsize) + err = xprt_send_rm_and_kvec(sock, msg, marker, + &xdr->head[0], base); + else + err = xprt_send_kvec(sock, msg, &xdr->head[0], base); + if (remainder == 0 || err != len) + goto out; + *sent_p += err; + base = 0; + } else { + base -= want; + } + + if (base < xdr->page_len) { + unsigned int len = xdr->page_len - base; + + remainder -= len; + if (remainder == 0) + msg->msg_flags &= ~MSG_MORE; + err = xprt_send_pagedata(sock, msg, xdr, base); + if (remainder == 0 || err != len) + goto out; + *sent_p += err; + base = 0; + } else { + base -= xdr->page_len; + } + + if (base >= xdr->tail[0].iov_len) + return 0; + msg->msg_flags &= ~MSG_MORE; + err = xprt_send_kvec(sock, msg, &xdr->tail[0], base); +out: + if (err > 0) { + *sent_p += err; + err = 0; + } + return err; +} diff --git a/net/sunrpc/socklib.h b/net/sunrpc/socklib.h new file mode 100644 index 000000000000..c48114ad6f00 --- /dev/null +++ b/net/sunrpc/socklib.h @@ -0,0 +1,15 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Copyright (C) 1995-1997 Olaf Kirch <okir@monad.swb.de> + * Copyright (C) 2020, Oracle. + */ + +#ifndef _NET_SUNRPC_SOCKLIB_H_ +#define _NET_SUNRPC_SOCKLIB_H_ + +int csum_partial_copy_to_xdr(struct xdr_buf *xdr, struct sk_buff *skb); +int xprt_sock_sendmsg(struct socket *sock, struct msghdr *msg, + struct xdr_buf *xdr, unsigned int base, + rpc_fraghdr marker, unsigned int *sent_p); + +#endif /* _NET_SUNRPC_SOCKLIB_H_ */ diff --git a/net/sunrpc/svcsock.c b/net/sunrpc/svcsock.c index 758ab10690de..1cc5c224392b 100644 --- a/net/sunrpc/svcsock.c +++ b/net/sunrpc/svcsock.c @@ -55,6 +55,7 @@ #include <linux/sunrpc/stats.h> #include <linux/sunrpc/xprt.h> +#include "socklib.h" #include "sunrpc.h" #define RPCDBG_FACILITY RPCDBG_SVCXPRT diff --git a/net/sunrpc/xprtsock.c b/net/sunrpc/xprtsock.c index d86c664ea6af..1a7c0856c5b6 100644 --- a/net/sunrpc/xprtsock.c +++ b/net/sunrpc/xprtsock.c @@ -54,6 +54,7 @@ #include <trace/events/sunrpc.h> +#include "socklib.h" #include "sunrpc.h" static void xs_close(struct rpc_xprt *xprt); @@ -749,125 +750,6 @@ xs_stream_start_connect(struct sock_xprt *transport) #define XS_SENDMSG_FLAGS (MSG_DONTWAIT | MSG_NOSIGNAL) -static int xs_sendmsg(struct socket *sock, struct msghdr *msg, size_t seek) -{ - if (seek) - iov_iter_advance(&msg->msg_iter, seek); - return sock_sendmsg(sock, msg); -} - -static int xs_send_kvec(struct socket *sock, struct msghdr *msg, struct kvec *vec, size_t seek) -{ - iov_iter_kvec(&msg->msg_iter, WRITE, vec, 1, vec->iov_len); - return xs_sendmsg(sock, msg, seek); -} - -static int xs_send_pagedata(struct socket *sock, struct msghdr *msg, struct xdr_buf *xdr, size_t base) -{ - int err; - - err = xdr_alloc_bvec(xdr, GFP_KERNEL); - if (err < 0) - return err; - - iov_iter_bvec(&msg->msg_iter, WRITE, xdr->bvec, - xdr_buf_pagecount(xdr), - xdr->page_len + xdr->page_base); - return xs_sendmsg(sock, msg, base + xdr->page_base); -} - -#define xs_record_marker_len() sizeof(rpc_fraghdr) - -/* Common case: - * - stream transport - * - sending from byte 0 of the message - * - the message is wholly contained in @xdr's head iovec - */ -static int xs_send_rm_and_kvec(struct socket *sock, struct msghdr *msg, - rpc_fraghdr marker, struct kvec *vec, size_t base) -{ - struct kvec iov[2] = { - [0] = { - .iov_base = &marker, - .iov_len = sizeof(marker) - }, - [1] = *vec, - }; - size_t len = iov[0].iov_len + iov[1].iov_len; - - iov_iter_kvec(&msg->msg_iter, WRITE, iov, 2, len); - return xs_sendmsg(sock, msg, base); -} - -/** - * xs_sendpages - write pages directly to a socket - * @sock: socket to send on - * @addr: UDP only -- address of destination - * @addrlen: UDP only -- length of destination address - * @xdr: buffer containing this request - * @base: starting position in the buffer - * @rm: stream record marker field - * @sent_p: return the total number of bytes successfully queued for sending - * - */ -static int xs_sendpages(struct socket *sock, struct sockaddr *addr, int addrlen, struct xdr_buf *xdr, unsigned int base, rpc_fraghdr rm, int *sent_p) -{ - struct msghdr msg = { - .msg_name = addr, - .msg_namelen = addrlen, - .msg_flags = XS_SENDMSG_FLAGS | MSG_MORE, - }; - unsigned int rmsize = rm ? sizeof(rm) : 0; - unsigned int remainder = rmsize + xdr->len - base; - unsigned int want; - int err = 0; - - if (unlikely(!sock)) - return -ENOTSOCK; - - want = xdr->head[0].iov_len + rmsize; - if (base < want) { - unsigned int len = want - base; - remainder -= len; - if (remainder == 0) - msg.msg_flags &= ~MSG_MORE; - if (rmsize) - err = xs_send_rm_and_kvec(sock, &msg, rm, - &xdr->head[0], base); - else - err = xs_send_kvec(sock, &msg, &xdr->head[0], base); - if (remainder == 0 || err != len) - goto out; - *sent_p += err; - base = 0; - } else - base -= want; - - if (base < xdr->page_len) { - unsigned int len = xdr->page_len - base; - remainder -= len; - if (remainder == 0) - msg.msg_flags &= ~MSG_MORE; - err = xs_send_pagedata(sock, &msg, xdr, base); - if (remainder == 0 || err != len) - goto out; - *sent_p += err; - base = 0; - } else - base -= xdr->page_len; - - if (base >= xdr->tail[0].iov_len) - return 0; - msg.msg_flags &= ~MSG_MORE; - err = xs_send_kvec(sock, &msg, &xdr->tail[0], base); -out: - if (err > 0) { - *sent_p += err; - err = 0; - } - return err; -} - /** * xs_nospace - handle transmit was incomplete * @req: pointer to RPC request @@ -959,8 +841,11 @@ static int xs_local_send_request(struct rpc_rqst *req) struct xdr_buf *xdr = &req->rq_snd_buf; rpc_fraghdr rm = xs_stream_record_marker(xdr); unsigned int msglen = rm ? req->rq_slen + sizeof(rm) : req->rq_slen; + struct msghdr msg = { + .msg_flags = XS_SENDMSG_FLAGS, + }; + unsigned int uninitialized_var(sent); int status; - int sent = 0; /* Close the stream if the previous transmission was incomplete */ if (xs_send_request_was_aborted(transport, req)) { @@ -972,8 +857,8 @@ static int xs_local_send_request(struct rpc_rqst *req) req->rq_svec->iov_base, req->rq_svec->iov_len); req->rq_xtime = ktime_get(); - status = xs_sendpages(transport->sock, NULL, 0, xdr, - transport->xmit.offset, rm, &sent); + status = xprt_sock_sendmsg(transport->sock, &msg, xdr, + transport->xmit.offset, rm, &sent); dprintk("RPC: %s(%u) = %d\n", __func__, xdr->len - transport->xmit.offset, status); @@ -1025,7 +910,12 @@ static int xs_udp_send_request(struct rpc_rqst *req) 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 sent = 0; + struct msghdr msg = { + .msg_name = xs_addr(xprt), + .msg_namelen = xprt->addrlen, + .msg_flags = XS_SENDMSG_FLAGS, + }; + unsigned int uninitialized_var(sent); int status; xs_pktdump("packet data:", @@ -1039,8 +929,7 @@ static int xs_udp_send_request(struct rpc_rqst *req) return -EBADSLT; req->rq_xtime = ktime_get(); - status = xs_sendpages(transport->sock, xs_addr(xprt), xprt->addrlen, - xdr, 0, 0, &sent); + status = xprt_sock_sendmsg(transport->sock, &msg, xdr, 0, 0, &sent); dprintk("RPC: xs_udp_send_request(%u) = %d\n", xdr->len, status); @@ -1106,9 +995,12 @@ static int xs_tcp_send_request(struct rpc_rqst *req) struct xdr_buf *xdr = &req->rq_snd_buf; rpc_fraghdr rm = xs_stream_record_marker(xdr); unsigned int msglen = rm ? req->rq_slen + sizeof(rm) : req->rq_slen; + struct msghdr msg = { + .msg_flags = XS_SENDMSG_FLAGS, + }; bool vm_wait = false; + unsigned int uninitialized_var(sent); int status; - int sent; /* Close the stream if the previous transmission was incomplete */ if (xs_send_request_was_aborted(transport, req)) { @@ -1129,9 +1021,8 @@ static int xs_tcp_send_request(struct rpc_rqst *req) * called sendmsg(). */ req->rq_xtime = ktime_get(); while (1) { - sent = 0; - status = xs_sendpages(transport->sock, NULL, 0, xdr, - transport->xmit.offset, rm, &sent); + status = xprt_sock_sendmsg(transport->sock, &msg, xdr, + transport->xmit.offset, rm, &sent); dprintk("RPC: xs_tcp_send_request(%u) = %d\n", xdr->len - transport->xmit.offset, status); |