netdev - [PATCH net v2 3/3] iavf: send VLAN offloading caps once after VFR

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Date: Tue, 16 May 2023 10:36:10 -0700
From: Tony Nguyen <anthony.l.nguyen@...el.com>
To: davem@...emloft.net,
	kuba@...nel.org,
	pabeni@...hat.com,
	edumazet@...gle.com,
	netdev@...r.kernel.org
Cc: Ahmed Zaki <ahmed.zaki@...el.com>,
	anthony.l.nguyen@...el.com,
	Rafal Romanowski <rafal.romanowski@...el.com>,
	Leon Romanovsky <leonro@...dia.com>
Subject: [PATCH net v2 3/3] iavf: send VLAN offloading caps once after VFR

From: Ahmed Zaki <ahmed.zaki@...el.com>

When the user disables rxvlan offloading and then changes the number of
channels, all VLAN ports are unable to receive traffic.

Changing the number of channels triggers a VFR reset. During re-init, when
VIRTCHNL_OP_GET_OFFLOAD_VLAN_V2_CAPS is received, we do:
1 - set the IAVF_FLAG_SETUP_NETDEV_FEATURES flag
2 - call
    iavf_set_vlan_offload_features(adapter, 0, netdev->features);

The second step sends to the PF the __default__ features, in this case
aq_required |= IAVF_FLAG_AQ_ENABLE_CTAG_VLAN_STRIPPING

While the first step forces the watchdog task to call
netdev_update_features() ->  iavf_set_features() ->
iavf_set_vlan_offload_features(adapter, netdev->features, features).
Since the user disabled the "rxvlan", this sets:
aq_required |= IAVF_FLAG_AQ_DISABLE_CTAG_VLAN_STRIPPING

When we start processing the AQ commands, both flags are enabled. Since we
process DISABLE_XTAG first then ENABLE_XTAG, this results in the PF
enabling the rxvlan offload. This breaks all communications on the VLAN
net devices.

Fix by removing the call to iavf_set_vlan_offload_features() (second
step). Calling netdev_update_features() from watchdog task is enough for
both init and reset paths.

Fixes: 7598f4b40bd6 ("iavf: Move netdev_update_features() into watchdog task")
Signed-off-by: Ahmed Zaki <ahmed.zaki@...el.com>
Tested-by: Rafal Romanowski <rafal.romanowski@...el.com>
Reviewed-by: Leon Romanovsky <leonro@...dia.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@...el.com>
---
 drivers/net/ethernet/intel/iavf/iavf_virtchnl.c | 5 -----
 1 file changed, 5 deletions(-)

diff --git a/drivers/net/ethernet/intel/iavf/iavf_virtchnl.c b/drivers/net/ethernet/intel/iavf/iavf_virtchnl.c
index 9afbbdac3590..7c0578b5457b 100644
--- a/drivers/net/ethernet/intel/iavf/iavf_virtchnl.c
+++ b/drivers/net/ethernet/intel/iavf/iavf_virtchnl.c
@@ -2238,11 +2238,6 @@ void iavf_virtchnl_completion(struct iavf_adapter *adapter,
 		iavf_process_config(adapter);
 		adapter->flags |= IAVF_FLAG_SETUP_NETDEV_FEATURES;
 
-		/* Request VLAN offload settings */
-		if (VLAN_V2_ALLOWED(adapter))
-			iavf_set_vlan_offload_features(adapter, 0,
-						       netdev->features);
-
 		iavf_set_queue_vlan_tag_loc(adapter);
 
 		was_mac_changed = !ether_addr_equal(netdev->dev_addr,
-- 
2.38.1