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xsk: Add support for recvmsg() 

Add support for non-blocking recvmsg() to XDP sockets. Previously,
only sendmsg() was supported by XDP socket. Now, for symmetry and the
upcoming busy-polling support, recvmsg() is added.

Signed-off-by: Björn Töpel <bjorn.topel@intel.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Magnus Karlsson <magnus.karlsson@intel.com>
Link: https://lore.kernel.org/bpf/20201130185205.196029-4-bjorn.topel@gmail.com
This commit is contained in:
Björn Töpel 2020-11-30 19:51:58 +01:00 committed by Daniel Borkmann
parent 7c951cafc0
commit 45a8668184
1 changed files with 21 additions and 1 deletions
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22
net/xdp/xsk.c
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@ -531,6 +531,26 @@ static int xsk_sendmsg(struct socket *sock, struct msghdr *m, size_t total_len)
return __xsk_sendmsg(sk);
}
static int xsk_recvmsg(struct socket *sock, struct msghdr *m, size_t len, int flags)
{
bool need_wait = !(flags & MSG_DONTWAIT);
struct sock *sk = sock->sk;
struct xdp_sock *xs = xdp_sk(sk);
if (unlikely(!(xs->dev->flags & IFF_UP)))
return -ENETDOWN;
if (unlikely(!xs->rx))
return -ENOBUFS;
if (unlikely(!xsk_is_bound(xs)))
return -ENXIO;
if (unlikely(need_wait))
return -EOPNOTSUPP;
if (xs->pool->cached_need_wakeup & XDP_WAKEUP_RX && xs->zc)
return xsk_wakeup(xs, XDP_WAKEUP_RX);
return 0;
}
static __poll_t xsk_poll(struct file *file, struct socket *sock,
struct poll_table_struct *wait)
{
@ -1191,7 +1211,7 @@ static const struct proto_ops xsk_proto_ops = {
.setsockopt = xsk_setsockopt,
.getsockopt = xsk_getsockopt,
.sendmsg = xsk_sendmsg,
.recvmsg = sock_no_recvmsg,
.recvmsg = xsk_recvmsg,
.mmap = xsk_mmap,
.sendpage = sock_no_sendpage,
};