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SUNRPC: Simplify TCP receive code by switching to using iterators
Most of this code should also be reusable with other socket types. Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
This commit is contained in:
Trond Myklebust
parent
9d96acbc7f
commit
277e4ab7d5
@ -31,15 +31,16 @@ struct sock_xprt {
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* State of TCP reply receive
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*/
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struct {
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__be32 fraghdr,
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struct {
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__be32 fraghdr,
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xid,
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calldir;
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} __attribute__((packed));
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u32 offset,
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len;
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unsigned long copied,
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flags;
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unsigned long copied;
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} recv;
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/*
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@ -76,21 +77,9 @@ struct sock_xprt {
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void (*old_error_report)(struct sock *);
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};
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/*
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* TCP receive state flags
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*/
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#define TCP_RCV_LAST_FRAG (1UL << 0)
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#define TCP_RCV_COPY_FRAGHDR (1UL << 1)
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#define TCP_RCV_COPY_XID (1UL << 2)
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#define TCP_RCV_COPY_DATA (1UL << 3)
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#define TCP_RCV_READ_CALLDIR (1UL << 4)
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#define TCP_RCV_COPY_CALLDIR (1UL << 5)
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/*
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* TCP RPC flags
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*/
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#define TCP_RPC_REPLY (1UL << 6)
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#define XPRT_SOCK_CONNECTING 1U
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#define XPRT_SOCK_DATA_READY (2)
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#define XPRT_SOCK_UPD_TIMEOUT (3)
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@ -497,16 +497,6 @@ TRACE_EVENT(xs_tcp_data_ready,
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__get_str(port), __entry->err, __entry->total)
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);
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#define rpc_show_sock_xprt_flags(flags) \
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__print_flags(flags, "|", \
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{ TCP_RCV_LAST_FRAG, "TCP_RCV_LAST_FRAG" }, \
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{ TCP_RCV_COPY_FRAGHDR, "TCP_RCV_COPY_FRAGHDR" }, \
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{ TCP_RCV_COPY_XID, "TCP_RCV_COPY_XID" }, \
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{ TCP_RCV_COPY_DATA, "TCP_RCV_COPY_DATA" }, \
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{ TCP_RCV_READ_CALLDIR, "TCP_RCV_READ_CALLDIR" }, \
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{ TCP_RCV_COPY_CALLDIR, "TCP_RCV_COPY_CALLDIR" }, \
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{ TCP_RPC_REPLY, "TCP_RPC_REPLY" })
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TRACE_EVENT(xs_tcp_data_recv,
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TP_PROTO(struct sock_xprt *xs),
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@ -516,7 +506,6 @@ TRACE_EVENT(xs_tcp_data_recv,
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__string(addr, xs->xprt.address_strings[RPC_DISPLAY_ADDR])
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__string(port, xs->xprt.address_strings[RPC_DISPLAY_PORT])
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__field(u32, xid)
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__field(unsigned long, flags)
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__field(unsigned long, copied)
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__field(unsigned int, reclen)
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__field(unsigned long, offset)
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@ -526,15 +515,13 @@ TRACE_EVENT(xs_tcp_data_recv,
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__assign_str(addr, xs->xprt.address_strings[RPC_DISPLAY_ADDR]);
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__assign_str(port, xs->xprt.address_strings[RPC_DISPLAY_PORT]);
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__entry->xid = be32_to_cpu(xs->recv.xid);
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__entry->flags = xs->recv.flags;
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__entry->copied = xs->recv.copied;
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__entry->reclen = xs->recv.len;
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__entry->offset = xs->recv.offset;
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),
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TP_printk("peer=[%s]:%s xid=0x%08x flags=%s copied=%lu reclen=%u offset=%lu",
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TP_printk("peer=[%s]:%s xid=0x%08x copied=%lu reclen=%u offset=%lu",
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__get_str(addr), __get_str(port), __entry->xid,
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rpc_show_sock_xprt_flags(__entry->flags),
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__entry->copied, __entry->reclen, __entry->offset)
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);
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@ -47,13 +47,13 @@
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#include <net/checksum.h>
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#include <net/udp.h>
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#include <net/tcp.h>
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#include <linux/bvec.h>
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#include <linux/uio.h>
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#include <trace/events/sunrpc.h>
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#include "sunrpc.h"
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#define RPC_TCP_READ_CHUNK_SZ (3*512*1024)
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static void xs_close(struct rpc_xprt *xprt);
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static void xs_tcp_set_socket_timeouts(struct rpc_xprt *xprt,
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struct socket *sock);
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@ -325,6 +325,323 @@ static void xs_free_peer_addresses(struct rpc_xprt *xprt)
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}
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}
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static size_t
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xs_alloc_sparse_pages(struct xdr_buf *buf, size_t want, gfp_t gfp)
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{
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size_t i,n;
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if (!(buf->flags & XDRBUF_SPARSE_PAGES))
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return want;
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if (want > buf->page_len)
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want = buf->page_len;
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n = (buf->page_base + want + PAGE_SIZE - 1) >> PAGE_SHIFT;
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for (i = 0; i < n; i++) {
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if (buf->pages[i])
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continue;
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buf->bvec[i].bv_page = buf->pages[i] = alloc_page(gfp);
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if (!buf->pages[i]) {
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buf->page_len = (i * PAGE_SIZE) - buf->page_base;
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return buf->page_len;
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}
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}
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return want;
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}
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static ssize_t
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xs_sock_recvmsg(struct socket *sock, struct msghdr *msg, int flags, size_t seek)
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{
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ssize_t ret;
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if (seek != 0)
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iov_iter_advance(&msg->msg_iter, seek);
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ret = sock_recvmsg(sock, msg, flags);
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return ret > 0 ? ret + seek : ret;
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}
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static ssize_t
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xs_read_kvec(struct socket *sock, struct msghdr *msg, int flags,
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struct kvec *kvec, size_t count, size_t seek)
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{
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iov_iter_kvec(&msg->msg_iter, READ | ITER_KVEC, kvec, 1, count);
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return xs_sock_recvmsg(sock, msg, flags, seek);
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}
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static ssize_t
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xs_read_bvec(struct socket *sock, struct msghdr *msg, int flags,
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struct bio_vec *bvec, unsigned long nr, size_t count,
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size_t seek)
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{
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iov_iter_bvec(&msg->msg_iter, READ | ITER_BVEC, bvec, nr, count);
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return xs_sock_recvmsg(sock, msg, flags, seek);
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}
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static ssize_t
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xs_read_discard(struct socket *sock, struct msghdr *msg, int flags,
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size_t count)
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{
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struct kvec kvec = { 0 };
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return xs_read_kvec(sock, msg, flags | MSG_TRUNC, &kvec, count, 0);
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}
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static ssize_t
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xs_read_xdr_buf(struct socket *sock, struct msghdr *msg, int flags,
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struct xdr_buf *buf, size_t count, size_t seek, size_t *read)
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{
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size_t want, seek_init = seek, offset = 0;
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ssize_t ret;
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if (seek < buf->head[0].iov_len) {
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want = min_t(size_t, count, buf->head[0].iov_len);
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ret = xs_read_kvec(sock, msg, flags, &buf->head[0], want, seek);
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if (ret <= 0)
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goto sock_err;
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offset += ret;
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if (offset == count || msg->msg_flags & (MSG_EOR|MSG_TRUNC))
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goto out;
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if (ret != want)
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goto eagain;
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seek = 0;
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} else {
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seek -= buf->head[0].iov_len;
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offset += buf->head[0].iov_len;
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}
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if (seek < buf->page_len) {
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want = xs_alloc_sparse_pages(buf,
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min_t(size_t, count - offset, buf->page_len),
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GFP_NOWAIT);
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ret = xs_read_bvec(sock, msg, flags, buf->bvec,
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xdr_buf_pagecount(buf),
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want + buf->page_base,
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seek + buf->page_base);
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if (ret <= 0)
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goto sock_err;
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offset += ret - buf->page_base;
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if (offset == count || msg->msg_flags & (MSG_EOR|MSG_TRUNC))
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goto out;
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if (ret != want)
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goto eagain;
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seek = 0;
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} else {
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seek -= buf->page_len;
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offset += buf->page_len;
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}
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if (seek < buf->tail[0].iov_len) {
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want = min_t(size_t, count - offset, buf->tail[0].iov_len);
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ret = xs_read_kvec(sock, msg, flags, &buf->tail[0], want, seek);
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if (ret <= 0)
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goto sock_err;
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offset += ret;
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if (offset == count || msg->msg_flags & (MSG_EOR|MSG_TRUNC))
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goto out;
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if (ret != want)
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goto eagain;
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} else
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offset += buf->tail[0].iov_len;
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ret = -EMSGSIZE;
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msg->msg_flags |= MSG_TRUNC;
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out:
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*read = offset - seek_init;
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return ret;
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eagain:
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ret = -EAGAIN;
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goto out;
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sock_err:
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offset += seek;
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goto out;
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}
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static void
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xs_read_header(struct sock_xprt *transport, struct xdr_buf *buf)
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{
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if (!transport->recv.copied) {
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if (buf->head[0].iov_len >= transport->recv.offset)
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memcpy(buf->head[0].iov_base,
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&transport->recv.xid,
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transport->recv.offset);
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transport->recv.copied = transport->recv.offset;
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}
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}
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static bool
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xs_read_stream_request_done(struct sock_xprt *transport)
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{
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return transport->recv.fraghdr & cpu_to_be32(RPC_LAST_STREAM_FRAGMENT);
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}
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static ssize_t
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xs_read_stream_request(struct sock_xprt *transport, struct msghdr *msg,
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int flags, struct rpc_rqst *req)
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{
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struct xdr_buf *buf = &req->rq_private_buf;
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size_t want, read;
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ssize_t ret;
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xs_read_header(transport, buf);
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want = transport->recv.len - transport->recv.offset;
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ret = xs_read_xdr_buf(transport->sock, msg, flags, buf,
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transport->recv.copied + want, transport->recv.copied,
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&read);
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transport->recv.offset += read;
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transport->recv.copied += read;
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if (transport->recv.offset == transport->recv.len) {
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if (xs_read_stream_request_done(transport))
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msg->msg_flags |= MSG_EOR;
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return transport->recv.copied;
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}
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switch (ret) {
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case -EMSGSIZE:
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return transport->recv.copied;
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case 0:
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return -ESHUTDOWN;
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default:
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if (ret < 0)
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return ret;
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}
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return -EAGAIN;
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}
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static size_t
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xs_read_stream_headersize(bool isfrag)
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{
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if (isfrag)
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return sizeof(__be32);
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return 3 * sizeof(__be32);
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}
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static ssize_t
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xs_read_stream_header(struct sock_xprt *transport, struct msghdr *msg,
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int flags, size_t want, size_t seek)
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{
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struct kvec kvec = {
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.iov_base = &transport->recv.fraghdr,
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.iov_len = want,
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};
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return xs_read_kvec(transport->sock, msg, flags, &kvec, want, seek);
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}
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#if defined(CONFIG_SUNRPC_BACKCHANNEL)
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static ssize_t
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xs_read_stream_call(struct sock_xprt *transport, struct msghdr *msg, int flags)
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{
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struct rpc_xprt *xprt = &transport->xprt;
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struct rpc_rqst *req;
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ssize_t ret;
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/* Look up and lock the request corresponding to the given XID */
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req = xprt_lookup_bc_request(xprt, transport->recv.xid);
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if (!req) {
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printk(KERN_WARNING "Callback slot table overflowed\n");
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return -ESHUTDOWN;
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}
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ret = xs_read_stream_request(transport, msg, flags, req);
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if (msg->msg_flags & (MSG_EOR|MSG_TRUNC))
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xprt_complete_bc_request(req, ret);
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return ret;
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}
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#else /* CONFIG_SUNRPC_BACKCHANNEL */
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static ssize_t
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xs_read_stream_call(struct sock_xprt *transport, struct msghdr *msg, int flags)
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{
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return -ESHUTDOWN;
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}
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#endif /* CONFIG_SUNRPC_BACKCHANNEL */
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static ssize_t
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xs_read_stream_reply(struct sock_xprt *transport, struct msghdr *msg, int flags)
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{
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struct rpc_xprt *xprt = &transport->xprt;
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struct rpc_rqst *req;
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ssize_t ret = 0;
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/* Look up and lock the request corresponding to the given XID */
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spin_lock(&xprt->queue_lock);
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req = xprt_lookup_rqst(xprt, transport->recv.xid);
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if (!req) {
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msg->msg_flags |= MSG_TRUNC;
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goto out;
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}
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xprt_pin_rqst(req);
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spin_unlock(&xprt->queue_lock);
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ret = xs_read_stream_request(transport, msg, flags, req);
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spin_lock(&xprt->queue_lock);
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if (msg->msg_flags & (MSG_EOR|MSG_TRUNC))
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xprt_complete_rqst(req->rq_task, ret);
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xprt_unpin_rqst(req);
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out:
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spin_unlock(&xprt->queue_lock);
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return ret;
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}
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static ssize_t
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xs_read_stream(struct sock_xprt *transport, int flags)
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{
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struct msghdr msg = { 0 };
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size_t want, read = 0;
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ssize_t ret = 0;
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if (transport->recv.len == 0) {
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want = xs_read_stream_headersize(transport->recv.copied != 0);
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ret = xs_read_stream_header(transport, &msg, flags, want,
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transport->recv.offset);
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if (ret <= 0)
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goto out_err;
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transport->recv.offset = ret;
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if (ret != want) {
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ret = -EAGAIN;
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goto out_err;
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}
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transport->recv.len = be32_to_cpu(transport->recv.fraghdr) &
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RPC_FRAGMENT_SIZE_MASK;
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transport->recv.offset -= sizeof(transport->recv.fraghdr);
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read = ret;
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}
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switch (be32_to_cpu(transport->recv.calldir)) {
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case RPC_CALL:
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ret = xs_read_stream_call(transport, &msg, flags);
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break;
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case RPC_REPLY:
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ret = xs_read_stream_reply(transport, &msg, flags);
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}
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if (msg.msg_flags & MSG_TRUNC) {
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transport->recv.calldir = cpu_to_be32(-1);
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transport->recv.copied = -1;
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}
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if (ret < 0)
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goto out_err;
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read += ret;
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if (transport->recv.offset < transport->recv.len) {
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ret = xs_read_discard(transport->sock, &msg, flags,
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transport->recv.len - transport->recv.offset);
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if (ret <= 0)
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goto out_err;
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transport->recv.offset += ret;
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read += ret;
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if (transport->recv.offset != transport->recv.len)
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return -EAGAIN;
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}
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if (xs_read_stream_request_done(transport)) {
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trace_xs_tcp_data_recv(transport);
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transport->recv.copied = 0;
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}
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transport->recv.offset = 0;
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transport->recv.len = 0;
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return read;
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out_err:
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switch (ret) {
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case 0:
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case -ESHUTDOWN:
|
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xprt_force_disconnect(&transport->xprt);
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return -ESHUTDOWN;
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}
|
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return ret;
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}
|
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|
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#define XS_SENDMSG_FLAGS (MSG_DONTWAIT | MSG_NOSIGNAL)
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|
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static int xs_send_kvec(struct socket *sock, struct sockaddr *addr, int addrlen, struct kvec *vec, unsigned int base, int more)
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@ -484,6 +801,12 @@ static int xs_nospace(struct rpc_rqst *req)
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return ret;
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}
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|
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static void
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xs_stream_prepare_request(struct rpc_rqst *req)
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{
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req->rq_task->tk_status = xdr_alloc_bvec(&req->rq_rcv_buf, GFP_NOIO);
|
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}
|
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|
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/*
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* Determine if the previous message in the stream was aborted before it
|
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* could complete transmission.
|
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@ -1157,263 +1480,7 @@ static void xs_tcp_force_close(struct rpc_xprt *xprt)
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xprt_force_disconnect(xprt);
|
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}
|
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|
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static inline void xs_tcp_read_fraghdr(struct rpc_xprt *xprt, struct xdr_skb_reader *desc)
|
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{
|
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struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
|
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size_t len, used;
|
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char *p;
|
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|
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p = ((char *) &transport->recv.fraghdr) + transport->recv.offset;
|
||||
len = sizeof(transport->recv.fraghdr) - transport->recv.offset;
|
||||
used = xdr_skb_read_bits(desc, p, len);
|
||||
transport->recv.offset += used;
|
||||
if (used != len)
|
||||
return;
|
||||
|
||||
transport->recv.len = ntohl(transport->recv.fraghdr);
|
||||
if (transport->recv.len & RPC_LAST_STREAM_FRAGMENT)
|
||||
transport->recv.flags |= TCP_RCV_LAST_FRAG;
|
||||
else
|
||||
transport->recv.flags &= ~TCP_RCV_LAST_FRAG;
|
||||
transport->recv.len &= RPC_FRAGMENT_SIZE_MASK;
|
||||
|
||||
transport->recv.flags &= ~TCP_RCV_COPY_FRAGHDR;
|
||||
transport->recv.offset = 0;
|
||||
|
||||
/* Sanity check of the record length */
|
||||
if (unlikely(transport->recv.len < 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",
|
||||
transport->recv.len);
|
||||
}
|
||||
|
||||
static void xs_tcp_check_fraghdr(struct sock_xprt *transport)
|
||||
{
|
||||
if (transport->recv.offset == transport->recv.len) {
|
||||
transport->recv.flags |= TCP_RCV_COPY_FRAGHDR;
|
||||
transport->recv.offset = 0;
|
||||
if (transport->recv.flags & TCP_RCV_LAST_FRAG) {
|
||||
transport->recv.flags &= ~TCP_RCV_COPY_DATA;
|
||||
transport->recv.flags |= TCP_RCV_COPY_XID;
|
||||
transport->recv.copied = 0;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
static inline void xs_tcp_read_xid(struct sock_xprt *transport, struct xdr_skb_reader *desc)
|
||||
{
|
||||
size_t len, used;
|
||||
char *p;
|
||||
|
||||
len = sizeof(transport->recv.xid) - transport->recv.offset;
|
||||
dprintk("RPC: reading XID (%zu bytes)\n", len);
|
||||
p = ((char *) &transport->recv.xid) + transport->recv.offset;
|
||||
used = xdr_skb_read_bits(desc, p, len);
|
||||
transport->recv.offset += used;
|
||||
if (used != len)
|
||||
return;
|
||||
transport->recv.flags &= ~TCP_RCV_COPY_XID;
|
||||
transport->recv.flags |= TCP_RCV_READ_CALLDIR;
|
||||
transport->recv.copied = 4;
|
||||
dprintk("RPC: reading %s XID %08x\n",
|
||||
(transport->recv.flags & TCP_RPC_REPLY) ? "reply for"
|
||||
: "request with",
|
||||
ntohl(transport->recv.xid));
|
||||
xs_tcp_check_fraghdr(transport);
|
||||
}
|
||||
|
||||
static inline void xs_tcp_read_calldir(struct sock_xprt *transport,
|
||||
struct xdr_skb_reader *desc)
|
||||
{
|
||||
size_t len, used;
|
||||
u32 offset;
|
||||
char *p;
|
||||
|
||||
/*
|
||||
* We want transport->recv.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->recv.offset is 4 (after having already read the xid).
|
||||
*/
|
||||
offset = transport->recv.offset - sizeof(transport->recv.xid);
|
||||
len = sizeof(transport->recv.calldir) - offset;
|
||||
dprintk("RPC: reading CALL/REPLY flag (%zu bytes)\n", len);
|
||||
p = ((char *) &transport->recv.calldir) + offset;
|
||||
used = xdr_skb_read_bits(desc, p, len);
|
||||
transport->recv.offset += used;
|
||||
if (used != len)
|
||||
return;
|
||||
transport->recv.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->recv.calldir)) {
|
||||
case RPC_REPLY:
|
||||
transport->recv.flags |= TCP_RCV_COPY_CALLDIR;
|
||||
transport->recv.flags |= TCP_RCV_COPY_DATA;
|
||||
transport->recv.flags |= TCP_RPC_REPLY;
|
||||
break;
|
||||
case RPC_CALL:
|
||||
transport->recv.flags |= TCP_RCV_COPY_CALLDIR;
|
||||
transport->recv.flags |= TCP_RCV_COPY_DATA;
|
||||
transport->recv.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;
|
||||
|
||||
rcvbuf = &req->rq_private_buf;
|
||||
|
||||
if (transport->recv.flags & TCP_RCV_COPY_CALLDIR) {
|
||||
/*
|
||||
* Save the RPC direction in the XDR buffer
|
||||
*/
|
||||
memcpy(rcvbuf->head[0].iov_base + transport->recv.copied,
|
||||
&transport->recv.calldir,
|
||||
sizeof(transport->recv.calldir));
|
||||
transport->recv.copied += sizeof(transport->recv.calldir);
|
||||
transport->recv.flags &= ~TCP_RCV_COPY_CALLDIR;
|
||||
}
|
||||
|
||||
len = desc->count;
|
||||
if (len > transport->recv.len - transport->recv.offset)
|
||||
desc->count = transport->recv.len - transport->recv.offset;
|
||||
r = xdr_partial_copy_from_skb(rcvbuf, transport->recv.copied,
|
||||
desc, xdr_skb_read_bits);
|
||||
|
||||
if (desc->count) {
|
||||
/* 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 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.
|
||||
*/
|
||||
transport->recv.flags &= ~TCP_RCV_COPY_DATA;
|
||||
dprintk("RPC: XID %08x truncated request\n",
|
||||
ntohl(transport->recv.xid));
|
||||
dprintk("RPC: xprt = %p, recv.copied = %lu, "
|
||||
"recv.offset = %u, recv.len = %u\n",
|
||||
xprt, transport->recv.copied,
|
||||
transport->recv.offset, transport->recv.len);
|
||||
return;
|
||||
}
|
||||
|
||||
transport->recv.copied += r;
|
||||
transport->recv.offset += r;
|
||||
desc->count = len - r;
|
||||
|
||||
dprintk("RPC: XID %08x read %zd bytes\n",
|
||||
ntohl(transport->recv.xid), r);
|
||||
dprintk("RPC: xprt = %p, recv.copied = %lu, recv.offset = %u, "
|
||||
"recv.len = %u\n", xprt, transport->recv.copied,
|
||||
transport->recv.offset, transport->recv.len);
|
||||
|
||||
if (transport->recv.copied == req->rq_private_buf.buflen)
|
||||
transport->recv.flags &= ~TCP_RCV_COPY_DATA;
|
||||
else if (transport->recv.offset == transport->recv.len) {
|
||||
if (transport->recv.flags & TCP_RCV_LAST_FRAG)
|
||||
transport->recv.flags &= ~TCP_RCV_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->recv.xid));
|
||||
|
||||
/* Find and lock the request corresponding to this xid */
|
||||
spin_lock(&xprt->queue_lock);
|
||||
req = xprt_lookup_rqst(xprt, transport->recv.xid);
|
||||
if (!req) {
|
||||
dprintk("RPC: XID %08x request not found!\n",
|
||||
ntohl(transport->recv.xid));
|
||||
spin_unlock(&xprt->queue_lock);
|
||||
return -1;
|
||||
}
|
||||
xprt_pin_rqst(req);
|
||||
spin_unlock(&xprt->queue_lock);
|
||||
|
||||
xs_tcp_read_common(xprt, desc, req);
|
||||
|
||||
spin_lock(&xprt->queue_lock);
|
||||
if (!(transport->recv.flags & TCP_RCV_COPY_DATA))
|
||||
xprt_complete_rqst(req->rq_task, transport->recv.copied);
|
||||
xprt_unpin_rqst(req);
|
||||
spin_unlock(&xprt->queue_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 the request corresponding to the given XID */
|
||||
req = xprt_lookup_bc_request(xprt, transport->recv.xid);
|
||||
if (req == NULL) {
|
||||
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->recv.flags & TCP_RCV_COPY_DATA))
|
||||
xprt_complete_bc_request(req, transport->recv.copied);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
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->recv.flags & TCP_RPC_REPLY) ?
|
||||
xs_tcp_read_reply(xprt, desc) :
|
||||
xs_tcp_read_callback(xprt, desc);
|
||||
}
|
||||
|
||||
static int xs_tcp_bc_up(struct svc_serv *serv, struct net *net)
|
||||
{
|
||||
int ret;
|
||||
@ -1429,106 +1496,14 @@ static size_t xs_tcp_bc_maxpayload(struct rpc_xprt *xprt)
|
||||
{
|
||||
return PAGE_SIZE;
|
||||
}
|
||||
#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 recv.flags.
|
||||
*/
|
||||
transport->recv.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 = transport->recv.len - transport->recv.offset;
|
||||
if (len > desc->count)
|
||||
len = desc->count;
|
||||
desc->count -= len;
|
||||
desc->offset += len;
|
||||
transport->recv.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;
|
||||
struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
|
||||
struct xdr_skb_reader desc = {
|
||||
.skb = skb,
|
||||
.offset = offset,
|
||||
.count = len,
|
||||
};
|
||||
size_t ret;
|
||||
|
||||
dprintk("RPC: xs_tcp_data_recv started\n");
|
||||
do {
|
||||
trace_xs_tcp_data_recv(transport);
|
||||
/* Read in a new fragment marker if necessary */
|
||||
/* Can we ever really expect to get completely empty fragments? */
|
||||
if (transport->recv.flags & TCP_RCV_COPY_FRAGHDR) {
|
||||
xs_tcp_read_fraghdr(xprt, &desc);
|
||||
continue;
|
||||
}
|
||||
/* Read in the xid if necessary */
|
||||
if (transport->recv.flags & TCP_RCV_COPY_XID) {
|
||||
xs_tcp_read_xid(transport, &desc);
|
||||
continue;
|
||||
}
|
||||
/* Read in the call/reply flag */
|
||||
if (transport->recv.flags & TCP_RCV_READ_CALLDIR) {
|
||||
xs_tcp_read_calldir(transport, &desc);
|
||||
continue;
|
||||
}
|
||||
/* Read in the request data */
|
||||
if (transport->recv.flags & TCP_RCV_COPY_DATA) {
|
||||
xs_tcp_read_data(xprt, &desc);
|
||||
continue;
|
||||
}
|
||||
/* Skip over any trailing bytes on short reads */
|
||||
xs_tcp_read_discard(transport, &desc);
|
||||
} while (desc.count);
|
||||
ret = len - desc.count;
|
||||
if (ret < rd_desc->count)
|
||||
rd_desc->count -= ret;
|
||||
else
|
||||
rd_desc->count = 0;
|
||||
trace_xs_tcp_data_recv(transport);
|
||||
dprintk("RPC: xs_tcp_data_recv done\n");
|
||||
return ret;
|
||||
}
|
||||
|
||||
static void xs_tcp_data_receive(struct sock_xprt *transport)
|
||||
{
|
||||
struct rpc_xprt *xprt = &transport->xprt;
|
||||
struct sock *sk;
|
||||
read_descriptor_t rd_desc = {
|
||||
.arg.data = xprt,
|
||||
};
|
||||
unsigned long total = 0;
|
||||
int read = 0;
|
||||
size_t read = 0;
|
||||
ssize_t ret = 0;
|
||||
|
||||
restart:
|
||||
mutex_lock(&transport->recv_mutex);
|
||||
@ -1536,18 +1511,12 @@ restart:
|
||||
if (sk == NULL)
|
||||
goto out;
|
||||
|
||||
/* We use rd_desc to pass struct xprt to xs_tcp_data_recv */
|
||||
for (;;) {
|
||||
rd_desc.count = RPC_TCP_READ_CHUNK_SZ;
|
||||
lock_sock(sk);
|
||||
read = tcp_read_sock(sk, &rd_desc, xs_tcp_data_recv);
|
||||
if (rd_desc.count != 0 || read < 0) {
|
||||
clear_bit(XPRT_SOCK_DATA_READY, &transport->sock_state);
|
||||
release_sock(sk);
|
||||
clear_bit(XPRT_SOCK_DATA_READY, &transport->sock_state);
|
||||
ret = xs_read_stream(transport, MSG_DONTWAIT | MSG_NOSIGNAL);
|
||||
if (ret < 0)
|
||||
break;
|
||||
}
|
||||
release_sock(sk);
|
||||
total += read;
|
||||
read += ret;
|
||||
if (need_resched()) {
|
||||
mutex_unlock(&transport->recv_mutex);
|
||||
cond_resched();
|
||||
@ -1558,7 +1527,7 @@ restart:
|
||||
queue_work(xprtiod_workqueue, &transport->recv_worker);
|
||||
out:
|
||||
mutex_unlock(&transport->recv_mutex);
|
||||
trace_xs_tcp_data_ready(xprt, read, total);
|
||||
trace_xs_tcp_data_ready(xprt, ret, read);
|
||||
}
|
||||
|
||||
static void xs_tcp_data_receive_workfn(struct work_struct *work)
|
||||
@ -2380,7 +2349,6 @@ static int xs_tcp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock)
|
||||
transport->recv.offset = 0;
|
||||
transport->recv.len = 0;
|
||||
transport->recv.copied = 0;
|
||||
transport->recv.flags = TCP_RCV_COPY_FRAGHDR | TCP_RCV_COPY_XID;
|
||||
transport->xmit.offset = 0;
|
||||
|
||||
/* Tell the socket layer to start connecting... */
|
||||
@ -2802,6 +2770,7 @@ static const struct rpc_xprt_ops xs_tcp_ops = {
|
||||
.connect = xs_connect,
|
||||
.buf_alloc = rpc_malloc,
|
||||
.buf_free = rpc_free,
|
||||
.prepare_request = xs_stream_prepare_request,
|
||||
.send_request = xs_tcp_send_request,
|
||||
.set_retrans_timeout = xprt_set_retrans_timeout_def,
|
||||
.close = xs_tcp_shutdown,
|
||||
|
||||
Loading…
Reference in New Issue
Block a user