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tcp_splice: Improve error reporting on connect path

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This makes a number of changes to improve error reporting while
connecting a new spliced socket:
* We use flow_err() and similar functions so all messages include info
   on which specific flow was affected
 * We use strerror() to interpret raw error values
 * We now report errors on connection (at "trace" level, since this would
   allow spamming the logs)
 * We also look up and report some details on EPOLLERR events, which can
   include connection errors, since we use a non-blocking connect().  Again
   we use "trace" level since this can spam the logs.

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
This commit is contained in:
David Gibson 2024-02-28 22:25:14 +11:00 committed by Stefano Brivio
parent f0e2a6b8c9
commit 4c2d923b12
1 changed files with 17 additions and 2 deletions
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19
tcp_splice.c
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@ -367,8 +367,11 @@ static int tcp_splice_connect(const struct ctx *c, struct tcp_splice_conn *conn,
}
if (connect(conn->s[1], sa, sl)) {
if (errno != EINPROGRESS)
if (errno != EINPROGRESS) {
flow_trace(conn, "Couldn't connect socket for splice: %s",
strerror(errno));
return -errno;
}
conn_event(c, conn, SPLICE_CONNECT);
} else {
@ -484,8 +487,20 @@ void tcp_splice_sock_handler(struct ctx *c, union epoll_ref ref,
if (conn->events == SPLICE_CLOSED)
return;
if (events & EPOLLERR)
if (events & EPOLLERR) {
int err, rc;
socklen_t sl = sizeof(err);
rc = getsockopt(ref.fd, SOL_SOCKET, SO_ERROR, &err, &sl);
if (rc)
flow_err(conn, "Error retrieving SO_ERROR: %s",
strerror(errno));
else
flow_trace(conn, "Error event on socket: %s",
strerror(err));
goto close;
}
if (conn->events == SPLICE_CONNECT) {
if (!(events & EPOLLOUT))