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SUNRPC: Refactor recvfrom path dealing with incomplete TCP receives 

Clean up: move exception processing out of the main path.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
This commit is contained in:
Chuck Lever 2020-05-20 12:29:13 -04:00
parent 7dae1dd726
commit 6be8c59491
2 changed files with 50 additions and 20 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

31
include/trace/events/sunrpc.h
View File

@ -1503,9 +1503,40 @@ DECLARE_EVENT_CLASS(svcsock_class,
DEFINE_SVCSOCK_EVENT(udp_send);
DEFINE_SVCSOCK_EVENT(tcp_send);
DEFINE_SVCSOCK_EVENT(tcp_recv);
DEFINE_SVCSOCK_EVENT(tcp_recv_eagain);
DEFINE_SVCSOCK_EVENT(tcp_recv_err);
DEFINE_SVCSOCK_EVENT(data_ready);
DEFINE_SVCSOCK_EVENT(write_space);
TRACE_EVENT(svcsock_tcp_recv_short,
TP_PROTO(
const struct svc_xprt *xprt,
u32 expected,
u32 received
),
TP_ARGS(xprt, expected, received),
TP_STRUCT__entry(
__field(u32, expected)
__field(u32, received)
__field(unsigned long, flags)
__string(addr, xprt->xpt_remotebuf)
),
TP_fast_assign(
__entry->expected = expected;
__entry->received = received;
__entry->flags = xprt->xpt_flags;
__assign_str(addr, xprt->xpt_remotebuf);
),
TP_printk("addr=%s flags=%s expected=%u received=%u",
__get_str(addr), show_svc_xprt_flags(__entry->flags),
__entry->expected, __entry->received
)
);
TRACE_EVENT(svcsock_tcp_state,
TP_PROTO(
const struct svc_xprt *xprt,

39
net/sunrpc/svcsock.c
View File

@ -968,23 +968,10 @@ static int svc_tcp_recvfrom(struct svc_rqst *rqstp)
svsk->sk_tcplen += len;
svsk->sk_datalen += len;
}
if (len != want || !svc_sock_final_rec(svsk)) {
svc_tcp_save_pages(svsk, rqstp);
if (len < 0 && len != -EAGAIN)
goto err_delete;
if (len == want)
svc_tcp_fragment_received(svsk);
else
dprintk("svc: incomplete TCP record (%d of %d)\n",
(int)(svsk->sk_tcplen - sizeof(rpc_fraghdr)),
svc_sock_reclen(svsk));
goto err_noclose;
}
if (svsk->sk_datalen < 8) {
svsk->sk_datalen = 0;
goto err_delete; /* client is nuts. */
}
if (len != want || !svc_sock_final_rec(svsk))
goto err_incomplete;
if (svsk->sk_datalen < 8)
goto err_nuts;
rqstp->rq_arg.len = svsk->sk_datalen;
rqstp->rq_arg.page_base = 0;
@ -1019,14 +1006,26 @@ static int svc_tcp_recvfrom(struct svc_rqst *rqstp)
return rqstp->rq_arg.len;
err_incomplete:
svc_tcp_save_pages(svsk, rqstp);
if (len < 0 && len != -EAGAIN)
goto err_delete;
if (len == want)
svc_tcp_fragment_received(svsk);
else
trace_svcsock_tcp_recv_short(&svsk->sk_xprt,
svc_sock_reclen(svsk),
svsk->sk_tcplen - sizeof(rpc_fraghdr));
goto err_noclose;
error:
if (len != -EAGAIN)
goto err_delete;
dprintk("RPC: TCP recvfrom got EAGAIN\n");
trace_svcsock_tcp_recv_eagain(&svsk->sk_xprt, 0);
return 0;
err_nuts:
svsk->sk_datalen = 0;
err_delete:
printk(KERN_NOTICE "%s: recvfrom returned errno %d\n",
svsk->sk_xprt.xpt_server->sv_name, -len);
trace_svcsock_tcp_recv_err(&svsk->sk_xprt, len);
set_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags);
err_noclose:
return 0; /* record not complete */