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udp: Merge vhost-user and "buf" listening socket paths

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udp_buf_listen_sock_data() and udp_vu_listen_sock_data() now have
effectively identical structure.  The forwarding functions used for flow
specific sockets (udp_buf_sock_to_tap(), udp_vu_sock_to_tap() and
udp_sock_to_sock()) also now take a number of datagrams.  This means we
can re-use them for the listening socket path, just passing '1' so they
handle a single datagram at a time.

This allows us to merge both the vhost-user and flow specific paths into
a single, simpler udp_listen_sock_data().

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 2025-04-04 21:15:37 +11:00 • committed by Stefano Brivio
parent 0304dd9c34
commit fc6ee68ad3
3 changed files with 10 additions and 80 deletions

27
udp.c
View file

@ -629,7 +629,7 @@ static int udp_sock_errs(const struct ctx *c, union epoll_ref ref)
*
* Return: 0 on success, -1 otherwise
*/
int udp_peek_addr(int s, union sockaddr_inany *src)
static int udp_peek_addr(int s, union sockaddr_inany *src)
{
struct msghdr msg = {
.msg_name = src,
@ -714,12 +714,12 @@ static void udp_buf_sock_to_tap(const struct ctx *c, int s, int n,
}
/**
* udp_buf_listen_sock_data() - Handle new data from socket
* udp_listen_sock_data() - Handle new data from listening socket
* @c: Execution context
* @ref: epoll reference
* @now: Current timestamp
*/
static void udp_buf_listen_sock_data(const struct ctx *c, union epoll_ref ref,
static void udp_listen_sock_data(const struct ctx *c, union epoll_ref ref,
const struct timespec *now)
{
union sockaddr_inany src;
@ -728,16 +728,13 @@ static void udp_buf_listen_sock_data(const struct ctx *c, union epoll_ref ref,
flow_sidx_t tosidx = udp_flow_from_sock(c, ref, &src, now);
uint8_t topif = pif_at_sidx(tosidx);
if (udp_sock_recv(c, ref.fd, udp_mh_recv, 1) <= 0)
break;
if (pif_is_socket(topif)) {
udp_splice_prepare(udp_mh_recv, 0);
udp_splice_send(c, 0, 1, tosidx);
udp_sock_to_sock(c, ref.fd, 1, tosidx);
} else if (topif == PIF_TAP) {
udp_tap_prepare(udp_mh_recv, 0, flowside_at_sidx(tosidx),
false);
tap_send_frames(c, &udp_l2_iov[0][0], UDP_NUM_IOVS, 1);
if (c->mode == MODE_VU)
udp_vu_sock_to_tap(c, ref.fd, 1, tosidx);
else
udp_buf_sock_to_tap(c, ref.fd, 1, tosidx);
} else if (flow_sidx_valid(tosidx)) {
flow_sidx_t fromsidx = flow_sidx_opposite(tosidx);
struct udp_flow *uflow = udp_at_sidx(tosidx);
@ -772,12 +769,8 @@ void udp_listen_sock_handler(const struct ctx *c,
}
}
if (events & EPOLLIN) {
if (c->mode == MODE_VU)
udp_vu_listen_sock_data(c, ref, now);
else
udp_buf_listen_sock_data(c, ref, now);
}
if (events & EPOLLIN)
udp_listen_sock_data(c, ref, now);
}
/**

1
udp_internal.h
View file

@ -30,6 +30,5 @@ size_t udp_update_hdr4(struct iphdr *ip4h, struct udp_payload_t *bp,
size_t udp_update_hdr6(struct ipv6hdr *ip6h, struct udp_payload_t *bp,
const struct flowside *toside, size_t dlen,
bool no_udp_csum);
int udp_peek_addr(int s, union sockaddr_inany *src);
#endif /* UDP_INTERNAL_H */

62
udp_vu.c
View file

@ -191,68 +191,6 @@ static void udp_vu_csum(const struct flowside *toside, int iov_used)
}
}
/**
* udp_vu_listen_sock_data() - Handle new data from socket
* @c: Execution context
* @ref: epoll reference
* @now: Current timestamp
*/
void udp_vu_listen_sock_data(const struct ctx *c, union epoll_ref ref,
const struct timespec *now)
{
struct vu_dev *vdev = c->vdev;
struct vu_virtq *vq = &vdev->vq[VHOST_USER_RX_QUEUE];
int i;
for (i = 0; i < UDP_MAX_FRAMES; i++) {
const struct flowside *toside;
union sockaddr_inany s_in;
flow_sidx_t sidx;
uint8_t pif;
ssize_t dlen;
int iov_used;
bool v6;
if (udp_peek_addr(ref.fd, &s_in) < 0)
break;
sidx = udp_flow_from_sock(c, ref, &s_in, now);
pif = pif_at_sidx(sidx);
if (pif != PIF_TAP) {
if (flow_sidx_valid(sidx)) {
flow_sidx_t fromsidx = flow_sidx_opposite(sidx);
struct udp_flow *uflow = udp_at_sidx(sidx);
flow_err(uflow,
"No support for forwarding UDP from %s to %s",
pif_name(pif_at_sidx(fromsidx)),
pif_name(pif));
} else {
debug("Discarding 1 datagram without flow");
}
continue;
}
toside = flowside_at_sidx(sidx);
v6 = !(inany_v4(&toside->eaddr) && inany_v4(&toside->oaddr));
iov_used = udp_vu_sock_recv(c, ref.fd, v6, &dlen);
if (iov_used <= 0)
break;
udp_vu_prepare(c, toside, dlen);
if (*c->pcap) {
udp_vu_csum(toside, iov_used);
pcap_iov(iov_vu, iov_used,
sizeof(struct virtio_net_hdr_mrg_rxbuf));
}
vu_flush(vdev, vq, elem, iov_used);
}
}
/**
* udp_vu_sock_to_tap() - Forward datagrams from socket to tap
* @c: Execution context