[dpdk-dev] [PATCH] net/i40e: solve vf vlan strip

[Qiming Chen <chenqiming_huawei@163.com>]

Kernel PF+DPDK VF mode, after vf adds vlan, the test result shows that the
vlan received from vf has been stripped.

The patch solves the problem that the kernel i40e.ko driver strips the vlan
by default after vf adds vlan. Determine whether to strip vlan through
the DEV_RX_OFFLOAD_VLAN_STRIP mask bit in rxmode.offload.

Environmental information:
1) dpdk 19.11
2) Kernel PF i40e.ko: 2.7.12
3) Firmware: 6.01 0x800034a3 1.1747.0

I did not use testpmd to test vlan filter, but write Demo for testing
based on the following deployment:
1) x710 nic, use 2 PFs, each PF virtualizes 1 VF
2) 2 pf connected with fiber optic cable
3) 2 vf are hard to pass through to the VM
4) In vm, dpdk takes over the vf port,
5) One port is used as the sending port, and the other port is used as
the receiving port, e.g. xmit portid is 0, rx portid is 1

Use the default configuration for port 0 as the sender, and configure
port 1 as the receiving port as follows:
1) rte_eth_dev_set_vlan_offload(1, ETH_VLAN_FILTER_OFFLOAD)
2) rte_eth_dev_vlan_filter(1, 100, 1)

Do the following tests:
Demo constructs a message with vlan 100 to be sent from port 0, and found
that the vlan header of the message received from port 1 was stripped.

Signed-off-by: Qiming Chen <chenqiming_huawei@163.com>
---
 drivers/net/i40e/i40e_ethdev_vf.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/net/i40e/i40e_ethdev_vf.c b/drivers/net/i40e/i40e_ethdev_vf.c
index 625981048a..e0208f4c35 100644
--- a/drivers/net/i40e/i40e_ethdev_vf.c
+++ b/drivers/net/i40e/i40e_ethdev_vf.c
@@ -1852,11 +1852,15 @@ static int
 i40evf_vlan_filter_set(struct rte_eth_dev *dev, uint16_t vlan_id, int on)
 {
 	int ret;
+	struct rte_eth_conf *dev_conf = &dev->data->dev_conf;
 
-	if (on)
+	if (on) {
 		ret = i40evf_add_vlan(dev, vlan_id);
-	else
+		if ((dev_conf->rxmode.offloads & DEV_RX_OFFLOAD_VLAN_STRIP) != DEV_RX_OFFLOAD_VLAN_STRIP)
+			i40evf_disable_vlan_strip(dev);
+	} else {
 		ret = i40evf_del_vlan(dev,vlan_id);
+	}
 
 	return ret;
 }
-- 
2.30.1.windows.1