From: Jan Sokolowski <jan.sokolowski@intel.com>
Date: Wed, 20 Feb 2019 15:20:14 +0000
Subject: ixgbe: don't do any AF_XDP zero-copy transmit if netif is not OK
Patch-mainline: v5.0-rc8
Git-commit: c685c69fba71462c3f9f6a1fb6151cded6c74d42
References: bsc#1113994 FATE#326315 FATE#326317

An issue has been found while testing zero-copy XDP that
causes a reset to be triggered. As it takes some time to
turn the carrier on after setting zc, and we already
start trying to transmit some packets, watchdog considers
this as an erroneous state and triggers a reset.

Don't do any work if netif carrier is not OK.

Fixes: 8221c5eba8c13 (ixgbe: add AF_XDP zero-copy Tx support)
Signed-off-by: Jan Sokolowski <jan.sokolowski@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
 drivers/net/ethernet/intel/ixgbe/ixgbe_xsk.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/drivers/net/ethernet/intel/ixgbe/ixgbe_xsk.c
+++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_xsk.c
@@ -642,7 +642,8 @@ static bool ixgbe_xmit_zc(struct ixgbe_r
 	dma_addr_t dma;
 
 	while (budget-- > 0) {
-		if (unlikely(!ixgbe_desc_unused(xdp_ring))) {
+		if (unlikely(!ixgbe_desc_unused(xdp_ring)) ||
+		    !netif_carrier_ok(xdp_ring->netdev)) {
 			work_done = false;
 			break;
 		}