linux-kernel - [PATCH bpf v2 1/2] xsk: replace datagram_poll by sock_poll

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Message-Id: <01f59423cad1b634fe704fe238a0038fd74df3ba.1606285978.git.xuanzhuo@linux.alibaba.com>
Date:   Wed, 25 Nov 2020 14:48:56 +0800
From:   Xuan Zhuo <xuanzhuo@...ux.alibaba.com>
To:     magnus.karlsson@...il.com
Cc:     Björn Töpel <bjorn.topel@...el.com>,
        Magnus Karlsson <magnus.karlsson@...el.com>,
        Jonathan Lemon <jonathan.lemon@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Jesper Dangaard Brouer <hawk@...nel.org>,
        John Fastabend <john.fastabend@...il.com>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        Andrii Nakryiko <andrii@...nel.org>,
        KP Singh <kpsingh@...omium.org>,
        netdev@...r.kernel.org (open list:XDP SOCKETS (AF_XDP)),
        bpf@...r.kernel.org (open list:XDP SOCKETS (AF_XDP)),
        linux-kernel@...r.kernel.org (open list)
Subject: [PATCH bpf v2 1/2] xsk: replace datagram_poll by sock_poll_wait

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 <xuanzhuo@...ux.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