net: dsa: allow rcv() and xmit() to be optional

Allow rcv() and xmit() dsa driver ops to be optional in case a driver
does not care to mangle a packet as in U-Boot only one network port is
enabled at a time and thus no packet mangling is necessary.

Suggested-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Signed-off-by: Tim Harvey <tharvey@gateworks.com>
Reviewed-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Reviewed-by: Fabio Estevam <festevam@denx.de>
Signed-off-by: Tim Harvey <tharvey@gateworks.com>

diff --git a/net/dsa-uclass.c b/net/dsa-uclass.c
index 211a991cdd0dc3c25b77aae2ba842365b238885f..dd78e5744d58cff973a36e778320dd122566aef2 100644 (file)
--- a/net/dsa-uclass.c
+++ b/net/dsa-uclass.c
@@ -142,20 +142,22 @@ static int dsa_port_send(struct udevice *pdev, void *packet, int length)
        struct dsa_port_pdata *port_pdata;
        int err;
 
-       if (length + head + tail > PKTSIZE_ALIGN)
-               return -EINVAL;
+       if (ops->xmit) {
+               if (length + head + tail > PKTSIZE_ALIGN)
+                       return -EINVAL;
 
-       memset(dsa_packet_tmp, 0, head);
-       memset(dsa_packet_tmp + head + length, 0, tail);
-       memcpy(dsa_packet_tmp + head, packet, length);
-       length += head + tail;
-       /* copy back to preserve original buffer alignment */
-       memcpy(packet, dsa_packet_tmp, length);
+               memset(dsa_packet_tmp, 0, head);
+               memset(dsa_packet_tmp + head + length, 0, tail);
+               memcpy(dsa_packet_tmp + head, packet, length);
+               length += head + tail;
+               /* copy back to preserve original buffer alignment */
+               memcpy(packet, dsa_packet_tmp, length);
 
-       port_pdata = dev_get_parent_plat(pdev);
-       err = ops->xmit(dev, port_pdata->index, packet, length);
-       if (err)
-               return err;
+               port_pdata = dev_get_parent_plat(pdev);
+               err = ops->xmit(dev, port_pdata->index, packet, length);
+               if (err)
+                       return err;
+       }
 
        return eth_get_ops(master)->send(master, packet, length);
 }
@@ -172,7 +174,7 @@ static int dsa_port_recv(struct udevice *pdev, int flags, uchar **packetp)
        int length, port_index, err;
 
        length = eth_get_ops(master)->recv(master, flags, packetp);
-       if (length <= 0)
+       if (length <= 0 || !ops->rcv)
                return length;
 
        /*