net: add RX preprocessor support

Add callback for optional rx_preprocessor. This is needed to add DSA
switch support and demultiplex traffic received from different switch ports.

Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de>
Link: https://lore.barebox.org/20220413082205.429509-2-o.rempel@pengutronix.de
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

1 files changed, 11 insertions, 0 deletions

diff --git a/net/net.c b/net/net.c
index fdb9ab826c..0b8e4caa0e 100644
--- a/net/net.c
+++ b/net/net.c
@@ -708,6 +708,17 @@ int net_receive(struct eth_device *edev, unsigned char *pkt, int len)
 		goto out;
 	}
 
+	if (edev->rx_preprocessor) {
+		ret = edev->rx_preprocessor(edev, &pkt, &len);
+		if (ret == -ENOMSG)
+			return 0;
+		if (ret) {
+			pr_debug("%s: rx_preprocessor failed %pe\n", __func__,
+				 ERR_PTR(ret));
+			return ret;
+		}
+	}
+
 	switch (et_protlen) {
 	case PROT_ARP:
 		ret = net_handle_arp(edev, pkt, len);