This is a note to let you know that I've just added the patch titled
i40e: Fix ATR queue selection
to the 5.13-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
i40e-fix-atr-queue-selection.patch
and it can be found in the queue-5.13 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit f540f96d8e484113b229dc5e8a79837d5243abfa
Author: Arkadiusz Kubalewski <arkadiusz.kubalewski@xxxxxxxxx>
Date: Wed Aug 18 10:42:16 2021 -0700
i40e: Fix ATR queue selection
[ Upstream commit a222be597e316389f9f8c26033352c124ce93056 ]
Without this patch, ATR does not work. Receive/transmit uses queue
selection based on SW DCB hashing method.
If traffic classes are not configured for PF, then use
netdev_pick_tx function for selecting queue for packet transmission.
Instead of calling i40e_swdcb_skb_tx_hash, call netdev_pick_tx,
which ensures that packet is transmitted/received from CPU that is
running the application.
Reproduction steps:
1. Load i40e driver
2. Map each MSI interrupt of i40e port for each CPU
3. Disable ntuple, enable ATR i.e.:
ethtool -K $interface ntuple off
ethtool --set-priv-flags $interface flow-director-atr
4. Run application that is generating traffic and is bound to a
single CPU, i.e.:
taskset -c 9 netperf -H 1.1.1.1 -t TCP_RR -l 10
5. Observe behavior:
Application's traffic should be restricted to the CPU provided in
taskset.
Fixes: 89ec1f0886c1 ("i40e: Fix queue-to-TC mapping on Tx")
Signed-off-by: Przemyslaw Patynowski <przemyslawx.patynowski@xxxxxxxxx>
Signed-off-by: Arkadiusz Kubalewski <arkadiusz.kubalewski@xxxxxxxxx>
Tested-by: Dave Switzer <david.switzer@xxxxxxxxx>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@xxxxxxxxx>
Signed-off-by: Jakub Kicinski <kuba@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/net/ethernet/intel/i40e/i40e_txrx.c b/drivers/net/ethernet/intel/i40e/i40e_txrx.c
index 107fb472319e..b18ff0ed8527 100644
--- a/drivers/net/ethernet/intel/i40e/i40e_txrx.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_txrx.c
@@ -3665,8 +3665,7 @@ u16 i40e_lan_select_queue(struct net_device *netdev,
/* is DCB enabled at all? */
if (vsi->tc_config.numtc == 1)
- return i40e_swdcb_skb_tx_hash(netdev, skb,
- netdev->real_num_tx_queues);
+ return netdev_pick_tx(netdev, skb, sb_dev);
prio = skb->priority;
hw = &vsi->back->hw;
