diff mbox series

[iwl-next,v1,8/8] igc: SW pad preemptible frames for correct mCRC calculation

Message ID 20250428060225.1306986-9-faizal.abdul.rahim@linux.intel.com
State Changes Requested
Headers show
Series igc: harmonize queue priority and add preemptible queue support | expand

Commit Message

Abdul Rahim, Faizal April 28, 2025, 6:02 a.m. UTC 
From: Chwee-Lin Choong <chwee.lin.choong@intel.com>

A hardware-padded frame transmitted from the preemptible queue
results in an incorrect mCRC computation by hardware, as the
padding bytes are not included in the mCRC calculation.

To address this, manually pad frames in preemptible queues to a
minimum length of 60 bytes using skb_padto() before transmission.
This ensures that the hardware includes the padding bytes in the
mCRC computation, producing a correct mCRC value.

Signed-off-by: Chwee-Lin Choong <chwee.lin.choong@intel.com>
Signed-off-by: Faizal Rahim <faizal.abdul.rahim@linux.intel.com>
---
 drivers/net/ethernet/intel/igc/igc_main.c | 9 +++++++++
 1 file changed, 9 insertions(+)
diff mbox series

Patch

diff --git a/drivers/net/ethernet/intel/igc/igc_main.c b/drivers/net/ethernet/intel/igc/igc_main.c
index 6b14b0d165f0..d495aee58601 100644
--- a/drivers/net/ethernet/intel/igc/igc_main.c
+++ b/drivers/net/ethernet/intel/igc/igc_main.c
@@ -1685,6 +1685,15 @@  static netdev_tx_t igc_xmit_frame_ring(struct sk_buff *skb,
 	first->tx_flags = tx_flags;
 	first->protocol = protocol;
 
+	/* For preemptible queue, manually pad the skb so that HW includes
+	 * padding bytes in mCRC calculation
+	 */
+	if (tx_ring->preemptible && skb->len < ETH_ZLEN) {
+		if (skb_padto(skb, ETH_ZLEN))
+			goto out_drop;
+		skb_put(skb, ETH_ZLEN - skb->len);
+	}
+
 	tso = igc_tso(tx_ring, first, launch_time, first_flag, &hdr_len);
 	if (tso < 0)
 		goto out_drop;