[PATCH net-next v5 11/14] net: ethernet: cortina: Account RX buffer size in truesize

[Linus Walleij <linusw@kernel.org>]

gmac_rx() charges only the received payload length for each page fragment
attached to an skb. Each fragment pins a complete free queue DMA buffer, so
short packets understate their memory use to GRO and socket accounting.

Charge the full posted fragment size for every attached fragment. The skb
already accounts for its own head separately.

The issue was found by reviewing the RX fragment accounting. The series was
tested on a D-Link DIR-685 with media playback and ksmbd transfers under
ping load.

Assisted-by: LLM
Signed-off-by: Linus Walleij <linusw@kernel.org>
---
 drivers/net/ethernet/cortina/gemini.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/cortina/gemini.c b/drivers/net/ethernet/cortina/gemini.c
index 70aa418d7037..d4e90aa97d22 100644
--- a/drivers/net/ethernet/cortina/gemini.c
+++ b/drivers/net/ethernet/cortina/gemini.c
@@ -1862,7 +1862,7 @@ static unsigned int gmac_rx(struct net_device *netdev, unsigned int budget,
 		skb_fill_page_desc(skb, frag_nr, page, page_offs, frag_len);
 		skb->len += frag_len;
 		skb->data_len += frag_len;
-		skb->truesize += frag_len;
+		skb->truesize += freeq_frag_len;
 		frag_nr++;
 
 		if (!(word3.bits32 & EOF_BIT))

-- 
2.56.0