linux-kernel - [PATCH net, 1/3] net: mana: Fix TX CQE error handling

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Message-Id: <1695519107-24139-2-git-send-email-haiyangz@microsoft.com>
Date:   Sat, 23 Sep 2023 18:31:45 -0700
From:   Haiyang Zhang <haiyangz@...rosoft.com>
To:     linux-hyperv@...r.kernel.org, netdev@...r.kernel.org
Cc:     haiyangz@...rosoft.com, decui@...rosoft.com, kys@...rosoft.com,
        paulros@...rosoft.com, olaf@...fle.de, vkuznets@...hat.com,
        davem@...emloft.net, wei.liu@...nel.org, edumazet@...gle.com,
        kuba@...nel.org, pabeni@...hat.com, leon@...nel.org,
        longli@...rosoft.com, ssengar@...ux.microsoft.com,
        linux-rdma@...r.kernel.org, daniel@...earbox.net,
        john.fastabend@...il.com, bpf@...r.kernel.org, ast@...nel.org,
        sharmaajay@...rosoft.com, hawk@...nel.org, tglx@...utronix.de,
        shradhagupta@...ux.microsoft.com, linux-kernel@...r.kernel.org,
        stable@...r.kernel.org
Subject: [PATCH net, 1/3] 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, because we don't
need stack trace here.

Cc: stable@...r.kernel.org
Fixes: ca9c54d2d6a5 ("net: mana: Add a driver for Microsoft Azure Network Adapter (MANA)")
Signed-off-by: Haiyang Zhang <haiyangz@...rosoft.com>
---
 drivers/net/ethernet/microsoft/mana/mana_en.c | 18 +++++++++++-------
 1 file changed, 11 insertions(+), 7 deletions(-)

diff --git a/drivers/net/ethernet/microsoft/mana/mana_en.c b/drivers/net/ethernet/microsoft/mana/mana_en.c
index 4a16ebff3d1d..5cdcf7561b38 100644
--- 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))
-- 
2.25.1