[PATCH v5 01/14] net: add RX preprocessor support

[Oleksij Rempel]

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 at pengutronix.de>
---
 include/net.h |  3 +++
 net/net.c     | 11 +++++++++++
 2 files changed, 14 insertions(+)

diff --git a/include/net.h b/include/net.h
index aad28e4f4c..ca9b6cd61e 100644
--- a/include/net.h
+++ b/include/net.h
@@ -44,9 +44,12 @@ struct eth_device {
 	void (*halt) (struct eth_device*);
 	int  (*get_ethaddr) (struct eth_device*, u8 adr[6]);
 	int  (*set_ethaddr) (struct eth_device*, const unsigned char *adr);
+	int  (*rx_preprocessor) (struct eth_device*, unsigned char **packet,
+				 int *length);
 
 	struct eth_device *next;
 	void *priv;
+	void *rx_preprocessor_priv;
 
 	/* phy device may attach itself for hardware timestamping */
 	struct phy_device *phydev;
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);
-- 
2.30.2