From: Haiyang Zhang <haiyangz@microsoft.com>

Date: Fri, 4 Feb 2022 14:45:44 -0800

Patch-mainline: v5.18-rc1

Subject: net: mana: Add handling of CQE_RX_TRUNCATED

Git-commit: e4b7621982d29f26ff4d39af389e5e675a4ffed4

References: bsc#1195651

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@microsoft.com>

Reviewed-by: Dexuan Cui <decui@microsoft.com>

Signed-off-by: David S. Miller <davem@davemloft.net>

Acked-by: Olaf Hering <ohering@suse.de>

---

 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

--- 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);