Patch "igc: Avoid transmit queue timeout for XDP" has been added to the 5.15-stable tree

[Sasha Levin <sashal@xxxxxxxxxx>]

This is a note to let you know that I've just added the patch titled

    igc: Avoid transmit queue timeout for XDP

to the 5.15-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:
     igc-avoid-transmit-queue-timeout-for-xdp.patch
and it can be found in the queue-5.15 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit fe08aa05703e772edfc3ad7fd2b01451a397da62
Author: Kurt Kanzenbach <kurt@xxxxxxxxxxxxx>
Date:   Wed Apr 12 09:36:11 2023 +0200

    igc: Avoid transmit queue timeout for XDP
    
    [ Upstream commit 95b681485563c64585de78662ee52d06b7fa47d9 ]
    
    High XDP load triggers the netdev watchdog:
    
    |NETDEV WATCHDOG: enp3s0 (igc): transmit queue 2 timed out
    
    The reason is the Tx queue transmission start (txq->trans_start) is not updated
    in XDP code path. Therefore, add it for all XDP transmission functions.
    
    Signed-off-by: Kurt Kanzenbach <kurt@xxxxxxxxxxxxx>
    Tested-by: Naama Meir <naamax.meir@xxxxxxxxxxxxxxx>
    Signed-off-by: Tony Nguyen <anthony.l.nguyen@xxxxxxxxx>
    Stable-dep-of: 78adb4bcf99e ("igc: Prevent garbled TX queue with XDP ZEROCOPY")
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/drivers/net/ethernet/intel/igc/igc_main.c b/drivers/net/ethernet/intel/igc/igc_main.c
index db48979cdecbc..6b747c7dc935f 100644
--- a/drivers/net/ethernet/intel/igc/igc_main.c
+++ b/drivers/net/ethernet/intel/igc/igc_main.c
@@ -2357,6 +2357,8 @@ static int igc_xdp_xmit_back(struct igc_adapter *adapter, struct xdp_buff *xdp)
 	nq = txring_txq(ring);
 
 	__netif_tx_lock(nq, cpu);
+	/* Avoid transmit queue timeout since we share it with the slow path */
+	txq_trans_cond_update(nq);
 	res = igc_xdp_init_tx_descriptor(ring, xdpf);
 	__netif_tx_unlock(nq);
 	return res;
@@ -2757,6 +2759,9 @@ static void igc_xdp_xmit_zc(struct igc_ring *ring)
 
 	__netif_tx_lock(nq, cpu);
 
+	/* Avoid transmit queue timeout since we share it with the slow path */
+	txq_trans_cond_update(nq);
+
 	budget = igc_desc_unused(ring);
 
 	while (xsk_tx_peek_desc(pool, &xdp_desc) && budget--) {
@@ -6251,6 +6256,9 @@ static int igc_xdp_xmit(struct net_device *dev, int num_frames,
 
 	__netif_tx_lock(nq, cpu);
 
+	/* Avoid transmit queue timeout since we share it with the slow path */
+	txq_trans_cond_update(nq);
+
 	drops = 0;
 	for (i = 0; i < num_frames; i++) {
 		int err;