From: Aya Levin ayal@nvidia.com
stable inclusion from stable-5.10.68 commit 0ab9981fa0c5f1ded9a70b44d9c003e549068e7a bugzilla: 182671 https://gitee.com/openeuler/kernel/issues/I4EWUH
Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=...
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commit e50e711351bdc656a8e6ca1022b4293cae8dcd59 upstream.
Turn udp_tunnel_nic work-queue to an ordered work-queue. This queue holds the UDP-tunnel configuration commands of the different netdevs. When the netdevs are functions of the same NIC the order of execution may be crucial.
Problem example: NIC with 2 PFs, both PFs declare offload quota of up to 3 UDP-ports. $ifconfig eth2 1.1.1.1/16 up
$ip link add eth2_19503 type vxlan id 5049 remote 1.1.1.2 dev eth2 dstport 19053 $ip link set dev eth2_19503 up
$ip link add eth2_19504 type vxlan id 5049 remote 1.1.1.3 dev eth2 dstport 19054 $ip link set dev eth2_19504 up
$ip link add eth2_19505 type vxlan id 5049 remote 1.1.1.4 dev eth2 dstport 19055 $ip link set dev eth2_19505 up
$ip link add eth2_19506 type vxlan id 5049 remote 1.1.1.5 dev eth2 dstport 19056 $ip link set dev eth2_19506 up
NIC RX port offload infrastructure offloads the first 3 UDP-ports (on all devices which sets NETIF_F_RX_UDP_TUNNEL_PORT feature) and not UDP-port 19056. So both PFs gets this offload configuration.
$ip link set dev eth2_19504 down
This triggers udp-tunnel-core to remove the UDP-port 19504 from offload-ports-list and offload UDP-port 19056 instead.
In this scenario it is important that the UDP-port of 19504 will be removed from both PFs before trying to add UDP-port 19056. The NIC can stop offloading a UDP-port only when all references are removed. Otherwise the NIC may report exceeding of the offload quota.
Fixes: cc4e3835eff4 ("udp_tunnel: add central NIC RX port offload infrastructure") Signed-off-by: Aya Levin ayal@nvidia.com Reviewed-by: Tariq Toukan tariqt@nvidia.com Signed-off-by: David S. Miller davem@davemloft.net Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org Signed-off-by: Chen Jun chenjun102@huawei.com Acked-by: Weilong Chen chenweilong@huawei.com
Signed-off-by: Chen Jun chenjun102@huawei.com --- net/ipv4/udp_tunnel_nic.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/net/ipv4/udp_tunnel_nic.c b/net/ipv4/udp_tunnel_nic.c index 0d122edc368d..b91003538d87 100644 --- a/net/ipv4/udp_tunnel_nic.c +++ b/net/ipv4/udp_tunnel_nic.c @@ -935,7 +935,7 @@ static int __init udp_tunnel_nic_init_module(void) { int err;
- udp_tunnel_nic_workqueue = alloc_workqueue("udp_tunnel_nic", 0, 0); + udp_tunnel_nic_workqueue = alloc_ordered_workqueue("udp_tunnel_nic", 0); if (!udp_tunnel_nic_workqueue) return -ENOMEM;