From: Kurt Kanzenbach <kurt@xxxxxxxxxxxxx>
[ 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>
---
drivers/net/ethernet/intel/igc/igc_main.c | 8 ++++++++
1 file changed, 8 insertions(+)
diff --git a/drivers/net/ethernet/intel/igc/igc_main.c b/drivers/net/ethernet/intel/igc/igc_main.c
index 273941f90f066..ade4bde47c65a 100644
--- a/drivers/net/ethernet/intel/igc/igc_main.c
+++ b/drivers/net/ethernet/intel/igc/igc_main.c
@@ -2402,6 +2402,8 @@ 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;
@@ -2804,6 +2806,9 @@ 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--) {
@@ -6297,6 +6302,9 @@ 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;
--
2.39.2
