[PATCH bpf v2 1/2] xsk: replace datagram_poll by sock_poll_wait

[Xuan Zhuo]

datagram_poll will judge the current socket status (EPOLLIN, EPOLLOUT)
based on the traditional socket information (eg: sk_wmem_alloc), but
this does not apply to xsk. So this patch uses sock_poll_wait instead of
datagram_poll, and the mask is calculated by xsk_poll.

Signed-off-by: Xuan Zhuo <xuanz...@linux.alibaba.com>
---
 net/xdp/xsk.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/net/xdp/xsk.c b/net/xdp/xsk.c
index b014197..0df8651 100644
--- a/net/xdp/xsk.c
+++ b/net/xdp/xsk.c
@@ -534,11 +534,13 @@ static int xsk_sendmsg(struct socket *sock, struct msghdr 
*m, size_t total_len)
 static __poll_t xsk_poll(struct file *file, struct socket *sock,
                             struct poll_table_struct *wait)
 {
-       __poll_t mask = datagram_poll(file, sock, wait);
+       __poll_t mask = 0;
        struct sock *sk = sock->sk;
        struct xdp_sock *xs = xdp_sk(sk);
        struct xsk_buff_pool *pool;
 
+       sock_poll_wait(file, sock, wait);
+
        if (unlikely(!xsk_is_bound(xs)))
                return mask;
 
-- 
1.8.3.1