linux-kernel - [PATCH net-next, 1/2] net: mana: Add handling of CQE_RX

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Message-Id: <1644014745-22261-2-git-send-email-haiyangz@microsoft.com>
Date:   Fri,  4 Feb 2022 14:45:44 -0800
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,
        sthemmin@...rosoft.com, paulros@...rosoft.com,
        shacharr@...rosoft.com, olaf@...fle.de, vkuznets@...hat.com,
        davem@...emloft.net, linux-kernel@...r.kernel.org
Subject: [PATCH net-next, 1/2] net: mana: Add handling of CQE_RX_TRUNCATED

The proper way to drop this kind of CQE is advancing rxq tail
without indicating the packet to the upper network layer.

Signed-off-by: Haiyang Zhang <haiyangz@...rosoft.com>
---
 drivers/net/ethernet/microsoft/mana/mana_en.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/microsoft/mana/mana_en.c b/drivers/net/ethernet/microsoft/mana/mana_en.c
index 69e791e6abc4..d2481a500654 100644
--- a/drivers/net/ethernet/microsoft/mana/mana_en.c
+++ b/drivers/net/ethernet/microsoft/mana/mana_en.c
@@ -1085,8 +1085,10 @@ static void mana_process_rx_cqe(struct mana_rxq *rxq, struct mana_cq *cq,
 		break;
 
 	case CQE_RX_TRUNCATED:
-		netdev_err(ndev, "Dropped a truncated packet\n");
-		return;
+		++ndev->stats.rx_dropped;
+		rxbuf_oob = &rxq->rx_oobs[rxq->buf_index];
+		netdev_warn_once(ndev, "Dropped a truncated packet\n");
+		goto drop;
 
 	case CQE_RX_COALESCED_4:
 		netdev_err(ndev, "RX coalescing is unsupported\n");
@@ -1154,6 +1156,7 @@ static void mana_process_rx_cqe(struct mana_rxq *rxq, struct mana_cq *cq,
 
 	mana_rx_skb(old_buf, oob, rxq);
 
+drop:
 	mana_move_wq_tail(rxq->gdma_rq, rxbuf_oob->wqe_inf.wqe_size_in_bu);
 
 	mana_post_pkt_rxq(rxq);
-- 
2.25.1