[PATCH 5.15 3/9] net: mana: Add handling of CQE_RX_TRUNCATED

Greg Kroah-Hartman
2022-06-23T17:51:19Z

From: Haiyang Zhang <haiyangz@microsoft.com>

commit e4b7621982d29f26ff4d39af389e5e675a4ffed4 upstream.

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/net/ethernet/microsoft/mana/mana_en.c | 7 +++++--
1 file changed, 5 insertions(+), 2 deletions(-)

--- a/drivers/net/ethernet/microsoft/mana/mana_en.c
+++ b/drivers/net/ethernet/microsoft/mana/mana_en.c
@@ -980,8 +980,10 @@ static void mana_process_rx_cqe(struct m
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");
@@ -1043,6 +1045,7 @@ static void mana_process_rx_cqe(struct m

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);