net: mana: Fix TX CQE error handling

For an unknown TX CQE error type (probably from a newer hardware),
still free the SKB, update the queue tail, etc., otherwise the
accounting will be wrong.

Also, TX errors can be triggered by injecting corrupted packets, so
replace the WARN_ONCE to ratelimited error logging.

Cc: stable@vger.kernel.org
Fixes: ca9c54d2d6a5 ("net: mana: Add a driver for Microsoft Azure Network Adapter (MANA)")
Signed-off-by: Haiyang Zhang <haiyangz@microsoft.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Reviewed-by: Shradha Gupta <shradhagupta@linux.microsoft.com>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>

diff --git a/drivers/net/ethernet/microsoft/mana/mana_en.c b/drivers/net/ethernet/microsoft/mana/mana_en.c
index 4a16ebff3d1d532a2a79f982b297a8bfd71f1fb4..5cdcf7561b38bbc89db79c2eeef6b6c067c1f4c2 100644 (file)
--- a/drivers/net/ethernet/microsoft/mana/mana_en.c
+++ b/drivers/net/ethernet/microsoft/mana/mana_en.c
@@ -1317,19 +1317,23 @@ static void mana_poll_tx_cq(struct mana_cq *cq)
                case CQE_TX_VPORT_IDX_OUT_OF_RANGE:
                case CQE_TX_VPORT_DISABLED:
                case CQE_TX_VLAN_TAGGING_VIOLATION:
-                       WARN_ONCE(1, "TX: CQE error %d: ignored.\n",
-                                 cqe_oob->cqe_hdr.cqe_type);
+                       if (net_ratelimit())
+                               netdev_err(ndev, "TX: CQE error %d\n",
+                                          cqe_oob->cqe_hdr.cqe_type);
+
                        apc->eth_stats.tx_cqe_err++;
                        break;
 
                default:
-                       /* If the CQE type is unexpected, log an error, assert,
-                        * and go through the error path.
+                       /* If the CQE type is unknown, log an error,
+                        * and still free the SKB, update tail, etc.
                         */
-                       WARN_ONCE(1, "TX: Unexpected CQE type %d: HW BUG?\n",
-                                 cqe_oob->cqe_hdr.cqe_type);
+                       if (net_ratelimit())
+                               netdev_err(ndev, "TX: unknown CQE type %d\n",
+                                          cqe_oob->cqe_hdr.cqe_type);
+
                        apc->eth_stats.tx_cqe_unknown_type++;
-                       return;
+                       break;
                }
 
                if (WARN_ON_ONCE(txq->gdma_txq_id != completions[i].wq_num))