[PATCH 5.13 081/127] i40e: Fix ATR queue selection

Sasha Levin
2021-08-24T17:01:41Z

From: Arkadiusz Kubalewski <arkadiusz.kubalewski@intel.com>

[ 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@intel.com>
Signed-off-by: Arkadiusz Kubalewski <arkadiusz.kubalewski@intel.com>
Tested-by: Dave Switzer <david.switzer@intel.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/net/ethernet/intel/i40e/i40e_txrx.c | 3 +--
1 file changed, 1 insertion(+), 2 deletions(-)

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;
--
2.30.2