netdev - [PATCH net 1/2] net: enetc: correct the statistics of rx bytes

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date: Fri,  2 Jun 2023 17:46:58 +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 1/2] net: enetc: correct the statistics of rx bytes

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

The rx_bytes of struct net_device_stats should count the length of
ethernet frames excluding the FCS. However, there are two problems
with the rx_bytes statistics of the current enetc driver. one is
that the length of VLAN header is not counted if the VLAN extraction
feature is enabled. The other is that the length of L2 header is not
counted, because eth_type_trans() is invoked before updating rx_bytes
which will subtract the length of L2 header from skb->len.
BTW, the rx_bytes statistics of XDP path also have similar problem,
I will fix it in another patch.

Fixes: a800abd3ecb9 ("net: enetc: move skb creation into enetc_build_skb")
Signed-off-by: Wei Fang <wei.fang@....com>
---
 drivers/net/ethernet/freescale/enetc/enetc.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/freescale/enetc/enetc.c b/drivers/net/ethernet/freescale/enetc/enetc.c
index 3c4fa26f0f9b..d6c0f3f46c2a 100644
--- a/drivers/net/ethernet/freescale/enetc/enetc.c
+++ b/drivers/net/ethernet/freescale/enetc/enetc.c
@@ -1229,7 +1229,13 @@ static int enetc_clean_rx_ring(struct enetc_bdr *rx_ring,
 		if (!skb)
 			break;
 
-		rx_byte_cnt += skb->len;
+		/* 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 += skb->len + ETH_HLEN;
 		rx_frm_cnt++;
 
 		napi_gro_receive(napi, skb);
-- 
2.25.1