net: stmmac: dwmac4: report Rx checksum errors in status

Propagate hardware checksum failures from the descriptor parser to the
caller.

Currently, dwmac4_wrback_get_rx_status() updates stats when the Rx
descriptor signals an IP header or payload checksum error, but it does
not reflect this in its return value. The higher-level stmmac_rx() code
therefore cannot tell that hardware checksum validation failed.

Set the csum_none flag in the returned status when either
RDES1_IP_HDR_ERROR or RDES1_IP_PAYLOAD_ERROR is present. This aligns
dwmac4 with enh_desc_coe_rdes0() and lets stmmac_rx() mark the skb as
CHECKSUM_NONE for software verification.

This is a preparatory step for disabling the hardware filter that drops
frames which do not pass checksum validation.

Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de>
Link: https://patch.msgid.link/20250818090217.2789521-3-o.rempel@pengutronix.de
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac4_descs.c b/drivers/net/ethernet/stmicro/stmmac/dwmac4_descs.c
index a5fb31eb0192f255698afffb44e9602b32c26314..aac68dc28dc1973429fa96aaa709b02ee39cd01a 100644 (file)
--- a/drivers/net/ethernet/stmicro/stmmac/dwmac4_descs.c
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac4_descs.c
@@ -110,16 +110,20 @@ static int dwmac4_wrback_get_rx_status(struct stmmac_extra_stats *x,
 
        message_type = (rdes1 & ERDES4_MSG_TYPE_MASK) >> 8;
 
-       if (rdes1 & RDES1_IP_HDR_ERROR)
+       if (rdes1 & RDES1_IP_HDR_ERROR) {
                x->ip_hdr_err++;
+               ret |= csum_none;
+       }
        if (rdes1 & RDES1_IP_CSUM_BYPASSED)
                x->ip_csum_bypassed++;
        if (rdes1 & RDES1_IPV4_HEADER)
                x->ipv4_pkt_rcvd++;
        if (rdes1 & RDES1_IPV6_HEADER)
                x->ipv6_pkt_rcvd++;
-       if (rdes1 & RDES1_IP_PAYLOAD_ERROR)
+       if (rdes1 & RDES1_IP_PAYLOAD_ERROR) {
                x->ip_payload_err++;
+               ret |= csum_none;
+       }
 
        if (message_type == RDES_EXT_NO_PTP)
                x->no_ptp_rx_msg_type_ext++;