netdev - [PATCH v4 bpf-next 03/10] ice: check DD bit on Rx descriptor rather than (EOP

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Date:   Thu, 16 Jun 2022 20:06:02 +0200
From:   Maciej Fijalkowski <maciej.fijalkowski@...el.com>
To:     bpf@...r.kernel.org, ast@...nel.org, daniel@...earbox.net
Cc:     netdev@...r.kernel.org, magnus.karlsson@...el.com,
        bjorn@...nel.org, kuba@...nel.org,
        Maciej Fijalkowski <maciej.fijalkowski@...el.com>
Subject: [PATCH v4 bpf-next 03/10] ice: check DD bit on Rx descriptor rather than (EOP | RS)

Tx side sets EOP and RS bits on descriptors to indicate that a
particular descriptor is the last one and needs to generate an irq when
it was sent. These bits should not be checked on completion path
regardless whether it's the Tx or the Rx. DD bit serves this purpose and
it indicates that a particular descriptor is either for Rx or was
successfully Txed.

Look at DD bit being set in ice_lbtest_receive_frames() instead of EOP
and RS pair.

Signed-off-by: Maciej Fijalkowski <maciej.fijalkowski@...el.com>
---
 drivers/net/ethernet/intel/ice/ice_ethtool.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/intel/ice/ice_ethtool.c b/drivers/net/ethernet/intel/ice/ice_ethtool.c
index 1e71b70f0e52..b6275a29fa0d 100644
--- a/drivers/net/ethernet/intel/ice/ice_ethtool.c
+++ b/drivers/net/ethernet/intel/ice/ice_ethtool.c
@@ -658,7 +658,7 @@ static int ice_lbtest_receive_frames(struct ice_rx_ring *rx_ring)
 		rx_desc = ICE_RX_DESC(rx_ring, i);
 
 		if (!(rx_desc->wb.status_error0 &
-		    cpu_to_le16(ICE_TX_DESC_CMD_EOP | ICE_TX_DESC_CMD_RS)))
+		    cpu_to_le16(BIT(ICE_RX_FLEX_DESC_STATUS0_DD_S))))
 			continue;
 
 		rx_buf = &rx_ring->rx_buf[i];
-- 
2.27.0