add Fix-ATR-queue-selection.patch.

Fix-ATR-queue-selection.patch

@@ -0,0 +1,58 @@
+From a222be597e316389f9f8c26033352c124ce93056 Mon Sep 17 00:00:00 2001
+From: Arkadiusz Kubalewski <arkadiusz.kubalewski@intel.com>
+Date: Wed, 18 Aug 2021 10:42:16 -0700
+Subject: i40e: Fix ATR queue selection
+
+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>
+
+Reference:https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=a222be597e316389f9f8c26033352c124ce93056
+Conflicting:Replaced some interface for adapting to the current kernel
+---
+ drivers/net/ethernet/intel/i40e/i40e_txrx.c | 3 +--
+ 1 file changed, 1 insertion(+), 2 deletions(-)
+
+(limited to 'drivers/net/ethernet/intel/i40e')
+
+diff --git a/drivers/net/ethernet/intel/i40e/i40e_txrx.c b/drivers/net/ethernet/intel/i40e/i40e_txrx.c
+index 3f25bd8c4924e..10a83e5385c70 100644
+--- a/drivers/net/ethernet/intel/i40e/i40e_txrx.c
++++ b/drivers/net/ethernet/intel/i40e/i40e_txrx.c
+@@ -3663,8 +3663,7 @@ 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 fallback(netdev, skb, sb_dev);
+ 
+ 	prio = skb->priority;
+ 	hw = &vsi->back->hw;
+-- 
+cgit 1.2.3-1.el7