[dpdk-dev] [PATCH v3] net/i40e: issue with ADD VLAN from Guest

[Souvik Dey <sodey@rbbn.com>]

Reset the configuration of vlan strip that would be change
by the pf kernel driver when adding vlan from vf.
Application cannot use rte_eth_dev_set_vlan_offload() to set
the VLAN_STRIP, as this will only work for the first time when
original and current config mismatch, but for all subsequent call
it will be ignored.

Signed-off-by: Souvik Dey <sodey@rbbn.com>
---
v3:
* Changed the error log in case vlan strip command fails
as per the latest comment.
---
v2:
* Simplied the commit log.
* goto err; is not required as it has only one more return path
and there is no cleanup required apart from just return err.
* Updated the comment start from /* -> /**
* Changed the error log in case vlan strip command fails.
---

 drivers/net/i40e/i40e_ethdev_vf.c | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/drivers/net/i40e/i40e_ethdev_vf.c b/drivers/net/i40e/i40e_ethdev_vf.c
index c26b036..2faee1d 100644
--- a/drivers/net/i40e/i40e_ethdev_vf.c
+++ b/drivers/net/i40e/i40e_ethdev_vf.c
@@ -1078,8 +1078,18 @@ i40evf_add_vlan(struct rte_eth_dev *dev, uint16_t vlanid)
 	args.out_buffer = vf->aq_resp;
 	args.out_size = I40E_AQ_BUF_SZ;
 	err = i40evf_execute_vf_cmd(dev, &args);
-	if (err)
+	if (err) {
 		PMD_DRV_LOG(ERR, "fail to execute command OP_ADD_VLAN");
+		return err;
+	}
+	/**
+	 * In linux kernel driver on receiving ADD_VLAN it enables
+	 * VLAN_STRIP by default. So reconfigure the vlan_offload
+	 * as it was done by the app earlier.
+	 */
+	err = i40evf_vlan_offload_set(dev, ETH_VLAN_STRIP_MASK);
+	if (err)
+		PMD_DRV_LOG(ERR, "fail to set vlan_strip");
 
 	return err;
 }
-- 
2.9.3.windows.1