From: guodeqing <geffrey.guo@huawei.com>
To: wensong@linux-vs.org
Cc: horms@verge.net.au, ja@ssi.bg, pablo@netfilter.org,
kadlec@netfilter.org, fw@strlen.de, davem@davemloft.net,
kuba@kernel.org, netdev@vger.kernel.org,
lvs-devel@vger.kernel.org, netfilter-devel@vger.kernel.org,
geffrey.guo@huawei.com
Subject: [PATCH,v2] ipvs: fix the connection sync failed in some cases
Date: Thu, 16 Jul 2020 16:12:08 +0800 [thread overview]
Message-ID: <1594887128-7453-1-git-send-email-geffrey.guo@huawei.com> (raw)
The sync_thread_backup only checks sk_receive_queue is empty or not,
there is a situation which cannot sync the connection entries when
sk_receive_queue is empty and sk_rmem_alloc is larger than sk_rcvbuf,
the sync packets are dropped in __udp_enqueue_schedule_skb, this is
because the packets in reader_queue is not read, so the rmem is
not reclaimed.
Here I add the check of whether the reader_queue of the udp sock is
empty or not to solve this problem.
Fixes: 2276f58ac589 ("udp: use a separate rx queue for packet reception")
Reported-by: zhouxudong <zhouxudong8@huawei.com>
Signed-off-by: guodeqing <geffrey.guo@huawei.com>
---
net/netfilter/ipvs/ip_vs_sync.c | 12 ++++++++----
1 file changed, 8 insertions(+), 4 deletions(-)
diff --git a/net/netfilter/ipvs/ip_vs_sync.c b/net/netfilter/ipvs/ip_vs_sync.c
index 605e0f6..2b8abbf 100644
--- a/net/netfilter/ipvs/ip_vs_sync.c
+++ b/net/netfilter/ipvs/ip_vs_sync.c
@@ -1717,6 +1717,8 @@ static int sync_thread_backup(void *data)
{
struct ip_vs_sync_thread_data *tinfo = data;
struct netns_ipvs *ipvs = tinfo->ipvs;
+ struct sock *sk = tinfo->sock->sk;
+ struct udp_sock *up = udp_sk(sk);
int len;
pr_info("sync thread started: state = BACKUP, mcast_ifn = %s, "
@@ -1724,12 +1726,14 @@ static int sync_thread_backup(void *data)
ipvs->bcfg.mcast_ifn, ipvs->bcfg.syncid, tinfo->id);
while (!kthread_should_stop()) {
- wait_event_interruptible(*sk_sleep(tinfo->sock->sk),
- !skb_queue_empty(&tinfo->sock->sk->sk_receive_queue)
- || kthread_should_stop());
+ wait_event_interruptible(*sk_sleep(sk),
+ !skb_queue_empty_lockless(&sk->sk_receive_queue) ||
+ !skb_queue_empty_lockless(&up->reader_queue) ||
+ kthread_should_stop());
/* do we have data now? */
- while (!skb_queue_empty(&(tinfo->sock->sk->sk_receive_queue))) {
+ while (!skb_queue_empty_lockless(&sk->sk_receive_queue) ||
+ !skb_queue_empty_lockless(&up->reader_queue)) {
len = ip_vs_receive(tinfo->sock, tinfo->buf,
ipvs->bcfg.sync_maxlen);
if (len <= 0) {
--
2.7.4
next reply other threads:[~2020-07-16 8:12 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-07-16 8:12 guodeqing [this message]
2020-07-19 6:08 ` [PATCH,v2] ipvs: fix the connection sync failed in some cases Julian Anastasov
2020-07-21 23:23 ` Pablo Neira Ayuso
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