netdev - [RFC PATCH net-next 08/11] net: enetc: increment rx_byte

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Date:   Mon,  6 Feb 2023 12:08:34 +0200
From:   Vladimir Oltean <vladimir.oltean@....com>
To:     netdev@...r.kernel.org
Cc:     "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Claudiu Manoil <claudiu.manoil@....com>,
        Björn Töpel <bjorn@...nel.org>,
        Magnus Karlsson <magnus.karlsson@...el.com>,
        Maciej Fijalkowski <maciej.fijalkowski@...el.com>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Jesper Dangaard Brouer <hawk@...nel.org>,
        John Fastabend <john.fastabend@...il.com>, bpf@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [RFC PATCH net-next 08/11] net: enetc: increment rx_byte_cnt for XDP data path

v->rx_ring.stats.bytes is apparently only used for interrupt coalescing,
not for printing to ethtool -S. I am unable to find a functional problem
caused by the lack of updating this counter, but it is updated from the
stack NAPI poll routine, so update it from the XDP one too.

Signed-off-by: Vladimir Oltean <vladimir.oltean@....com>
---
 drivers/net/ethernet/freescale/enetc/enetc.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/freescale/enetc/enetc.c b/drivers/net/ethernet/freescale/enetc/enetc.c
index fe6a3a531a0a..e4552acf762c 100644
--- a/drivers/net/ethernet/freescale/enetc/enetc.c
+++ b/drivers/net/ethernet/freescale/enetc/enetc.c
@@ -1461,7 +1461,8 @@ static void enetc_add_rx_buff_to_xdp(struct enetc_bdr *rx_ring, int i,
 
 static void enetc_build_xdp_buff(struct enetc_bdr *rx_ring, u32 bd_status,
 				 union enetc_rx_bd **rxbd, int *i,
-				 int *buffs_missing, struct xdp_buff *xdp_buff)
+				 int *buffs_missing, struct xdp_buff *xdp_buff,
+				 int *rx_byte_cnt)
 {
 	u16 size = le16_to_cpu((*rxbd)->r.buf_len);
 
@@ -1469,6 +1470,7 @@ static void enetc_build_xdp_buff(struct enetc_bdr *rx_ring, u32 bd_status,
 
 	enetc_map_rx_buff_to_xdp(rx_ring, *i, xdp_buff, size);
 	(*buffs_missing)++;
+	(*rx_byte_cnt) += size;
 	enetc_rxbd_next(rx_ring, rxbd, i);
 
 	/* not last BD in frame? */
@@ -1483,6 +1485,7 @@ static void enetc_build_xdp_buff(struct enetc_bdr *rx_ring, u32 bd_status,
 
 		enetc_add_rx_buff_to_xdp(rx_ring, *i, size, xdp_buff);
 		(*buffs_missing)++;
+		(*rx_byte_cnt) += size;
 		enetc_rxbd_next(rx_ring, rxbd, i);
 	}
 }
@@ -1571,7 +1574,7 @@ static int enetc_clean_rx_ring_xdp(struct enetc_bdr *rx_ring,
 		orig_i = i;
 
 		enetc_build_xdp_buff(rx_ring, bd_status, &rxbd, &i,
-				     &buffs_missing, &xdp_buff);
+				     &buffs_missing, &xdp_buff, &rx_byte_cnt);
 
 		xdp_act = bpf_prog_run_xdp(prog, &xdp_buff);
 
-- 
2.34.1