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tap: Use a common function to start a new connection

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Merge code from tap_backend_init(), tap_sock_tun_init() and
tap_listen_handler() to set epoll_ref entry and to add it
to epollfd.

No functionality change

Signed-off-by: Laurent Vivier <lvivier@redhat.com>
Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
This commit is contained in:
Laurent Vivier 2024-12-09 17:54:49 +01:00 committed by Stefano Brivio
parent 8996d183c5
commit 2139ad33fc
1 changed files with 30 additions and 36 deletions
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66
tap.c
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@ -1255,6 +1255,33 @@ static void tap_sock_unix_init(const struct ctx *c)
epoll_ctl(c->epollfd, EPOLL_CTL_ADD, c->fd_tap_listen, &ev);
}
/**
* tap_start_connection() - start a new connection
* @c: Execution context
*/
static void tap_start_connection(const struct ctx *c)
{
struct epoll_event ev = { 0 };
union epoll_ref ref = { 0 };
ref.fd = c->fd_tap;
switch (c->mode) {
case MODE_PASST:
ref.type = EPOLL_TYPE_TAP_PASST;
break;
case MODE_PASTA:
ref.type = EPOLL_TYPE_TAP_PASTA;
break;
case MODE_VU:
ref.type = EPOLL_TYPE_VHOST_CMD;
break;
}
ev.events = EPOLLIN | EPOLLRDHUP;
ev.data.u64 = ref.u64;
epoll_ctl(c->epollfd, EPOLL_CTL_ADD, c->fd_tap, &ev);
}
/**
* tap_listen_handler() - Handle new connection on listening socket
* @c: Execution context
@ -1262,8 +1289,6 @@ static void tap_sock_unix_init(const struct ctx *c)
*/
void tap_listen_handler(struct ctx *c, uint32_t events)
{
struct epoll_event ev = { 0 };
union epoll_ref ref = { 0 };
int v = INT_MAX / 2;
struct ucred ucred;
socklen_t len;
@ -1302,14 +1327,7 @@ void tap_listen_handler(struct ctx *c, uint32_t events)
setsockopt(c->fd_tap, SOL_SOCKET, SO_SNDBUF, &v, sizeof(v)))
trace("tap: failed to set SO_SNDBUF to %i", v);
ref.fd = c->fd_tap;
if (c->mode == MODE_VU)
ref.type = EPOLL_TYPE_VHOST_CMD;
else
ref.type = EPOLL_TYPE_TAP_PASST;
ev.events = EPOLLIN | EPOLLRDHUP;
ev.data.u64 = ref.u64;
epoll_ctl(c->epollfd, EPOLL_CTL_ADD, c->fd_tap, &ev);
tap_start_connection(c);
}
/**
@ -1353,19 +1371,13 @@ static int tap_ns_tun(void *arg)
*/
static void tap_sock_tun_init(struct ctx *c)
{
union epoll_ref ref = { .type = EPOLL_TYPE_TAP_PASTA };
struct epoll_event ev = { 0 };
NS_CALL(tap_ns_tun, c);
if (c->fd_tap == -1)
die("Failed to set up tap device in namespace");
pasta_ns_conf(c);
ref.fd = c->fd_tap;
ev.events = EPOLLIN | EPOLLRDHUP;
ev.data.u64 = ref.u64;
epoll_ctl(c->epollfd, EPOLL_CTL_ADD, c->fd_tap, &ev);
tap_start_connection(c);
}
/**
@ -1399,26 +1411,8 @@ void tap_backend_init(struct ctx *c)
tap_sock_update_pool(pkt_buf, sizeof(pkt_buf));
if (c->fd_tap != -1) { /* Passed as --fd */
struct epoll_event ev = { 0 };
union epoll_ref ref;
ASSERT(c->one_off);
ref.fd = c->fd_tap;
switch (c->mode) {
case MODE_PASST:
ref.type = EPOLL_TYPE_TAP_PASST;
break;
case MODE_PASTA:
ref.type = EPOLL_TYPE_TAP_PASTA;
break;
case MODE_VU:
ref.type = EPOLL_TYPE_VHOST_CMD;
break;
}
ev.events = EPOLLIN | EPOLLRDHUP;
ev.data.u64 = ref.u64;
epoll_ctl(c->epollfd, EPOLL_CTL_ADD, c->fd_tap, &ev);
tap_start_connection(c);
return;
}