Subject: [PATCH v2 net-next 04/11] net: ena: Introduce total_tx_size field in ena_tx_buffer struct

From: <[email-masked]>
Date: Mon, 1 Jan 2024 19:08:48 +0000

From: David Arinzon <[email-masked]>

To avoid de-referencing skb or xdp_frame when we poll for TX completion
(where they might not be in the cache), save the total TX packet size in
the ena_tx_buffer object representing the packet.

Also the 'print_once' field's type was changed from u32 to u8 to allow
adding the 'total_tx_size' without changing the total size of the
struct.

Signed-off-by: Shay Agroskin <[email-masked]>
Signed-off-by: David Arinzon <[email-masked]>
---
 drivers/net/ethernet/amazon/ena/ena_netdev.c | 3 ++-
 drivers/net/ethernet/amazon/ena/ena_netdev.h | 4 +++-
 2 files changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/amazon/ena/ena_netdev.c b/drivers/net/ethernet/amazon/ena/ena_netdev.c
index b7f300b..3c84259 100644
--- a/drivers/net/ethernet/amazon/ena/ena_netdev.c
+++ b/drivers/net/ethernet/amazon/ena/ena_netdev.c
@@ -130,6 +130,7 @@ int ena_xmit_common(struct ena_adapter *adapter,
 	u64_stats_update_end(&ring->syncp);
 
 	tx_info->tx_descs = nb_hw_desc;
+	tx_info->total_tx_size = bytes;
 	tx_info->last_jiffies = jiffies;
 	tx_info->print_once = 0;
 
@@ -842,7 +843,7 @@ static int ena_clean_tx_irq(struct ena_ring *tx_ring, u32 budget)
 			  "tx_poll: q %d skb %p completed\n", tx_ring->qid,
 			  skb);
 
-		tx_bytes += skb->len;
+		tx_bytes += tx_info->total_tx_size;
 		dev_kfree_skb(skb);
 		tx_pkts++;
 		total_done += tx_info->tx_descs;
diff --git a/drivers/net/ethernet/amazon/ena/ena_netdev.h b/drivers/net/ethernet/amazon/ena/ena_netdev.h
index 78a4dee..d3fc03f 100644
--- a/drivers/net/ethernet/amazon/ena/ena_netdev.h
+++ b/drivers/net/ethernet/amazon/ena/ena_netdev.h
@@ -145,12 +145,14 @@ struct ena_tx_buffer {
 	/* num of buffers used by this skb */
 	u32 num_of_bufs;
 
+	/* Total size of all buffers in bytes */
+	u32 total_tx_size;
 
 	/* Indicate if bufs[0] map the linear data of the skb. */
 	u8 map_linear_data;
 
 	/* Used for detect missing tx packets to limit the number of prints */
-	u32 print_once;
+	u8 print_once;
 	/* Save the last jiffies to detect missing tx packets
 	 *
 	 * sets to non zero value on ena_start_xmit and set to zero on
-- 
2.40.1