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authorBjörn Töpel <bjorn.topel@intel.com>2020-11-30 19:51:58 +0100
committerDaniel Borkmann <daniel@iogearbox.net>2020-12-01 00:09:25 +0100
commit45a86681844e375bef6f6add272ccc309bb6a08d (patch)
tree116b2330640badf0b63dbb42d928ce2c154a59a9 /net/xdp
parent7c951cafc0cb2e575f1d58677b95ac387ac0a5bd (diff)
downloadlinux-45a86681844e375bef6f6add272ccc309bb6a08d.tar.bz2
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
Diffstat (limited to 'net/xdp')
-rw-r--r--net/xdp/xsk.c22
1 files changed, 21 insertions, 1 deletions
diff --git a/net/xdp/xsk.c b/net/xdp/xsk.c
index 3e33cb6e68e6..1d1e0cd51a95 100644
--- a/net/xdp/xsk.c
+++ b/net/xdp/xsk.c
@@ -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,
};