udp, passt: Introduce socket packet buffer, avoid getsockname() for UDP

This is in preparation for scatter-gather IO on the UDP receive path:
save a getsockname() syscall by setting a flag if we get the numbering
of all bound sockets in a strict sequence (expected, in practice) and
repurpose the tap buffer to be also a socket receive buffer, passing
it down to protocol handlers.

Signed-off-by: Stefano Brivio <sbrivio@redhat.com>

1 files changed, 4 insertions, 1 deletions

diff --git a/tcp.c b/tcp.c
index df9508c..3c92d37 100644
--- a/tcp.c
+++ b/tcp.c
@@ -1402,14 +1402,17 @@ static void tcp_connect_finish(struct ctx *c, int s)
  * @c:		Execution context
  * @s:		File descriptor number for socket
  * @events:	epoll events bitmap
+ * @pkt_buf:	Buffer to receive packets, currently unused
  * @now:	Current timestamp
  */
-void tcp_sock_handler(struct ctx *c, int s, uint32_t events,
+void tcp_sock_handler(struct ctx *c, int s, uint32_t events, char *pkt_buf,
 		      struct timespec *now)
 {
 	socklen_t sl;
 	int accept;
 
+	(void)pkt_buf;
+
 	if (tc[s].s == LAST_ACK) {
 		tcp_send_to_tap(c, s, ACK, NULL, 0);
 		tcp_close_and_epoll_del(c, s);