linux-kernel - [PATCH net 2/2] net: enetc: correct rx

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Message-Id: <20230602094659.965523-3-wei.fang@nxp.com>
Date:   Fri,  2 Jun 2023 17:46:59 +0800
From:   wei.fang@....com
To:     claudiu.manoil@....com, vladimir.oltean@....com,
        davem@...emloft.net, edumazet@...gle.com, kuba@...nel.or,
        pabeni@...hat.com, ast@...nel.org, daniel@...earbox.net,
        hawk@...nel.org, john.fastabend@...il.com, netdev@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org
Subject: [PATCH net 2/2] net: enetc: correct rx_bytes statistics of XDP

From: Wei Fang <wei.fang@....com>

The rx_bytes statistics of XDP are always zero, because rx_byte_cnt
is not updated after it is initialized to 0. So fix it.

Fixes: d1b15102dd16 ("net: enetc: add support for XDP_DROP and XDP_PASS")
Signed-off-by: Wei Fang <wei.fang@....com>
---
 drivers/net/ethernet/freescale/enetc/enetc.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/drivers/net/ethernet/freescale/enetc/enetc.c b/drivers/net/ethernet/freescale/enetc/enetc.c
index d6c0f3f46c2a..9e1b2536e9a9 100644
--- a/drivers/net/ethernet/freescale/enetc/enetc.c
+++ b/drivers/net/ethernet/freescale/enetc/enetc.c
@@ -1571,6 +1571,14 @@ static int enetc_clean_rx_ring_xdp(struct enetc_bdr *rx_ring,
 		enetc_build_xdp_buff(rx_ring, bd_status, &rxbd, &i,
 				     &cleaned_cnt, &xdp_buff);
 
+		/* When set, the outer VLAN header is extracted and reported
+		 * in the receive buffer descriptor. So rx_byte_cnt should
+		 * add the length of the extracted VLAN header.
+		 */
+		if (bd_status & ENETC_RXBD_FLAG_VLAN)
+			rx_byte_cnt += VLAN_HLEN;
+		rx_byte_cnt += xdp_get_buff_len(&xdp_buff);
+
 		xdp_act = bpf_prog_run_xdp(prog, &xdp_buff);
 
 		switch (xdp_act) {
-- 
2.25.1