Hi Andrew,
On Wednesday 05 April 2017 19:10:01 Andrew Lunn wrote:
> [...]
> > +static int lan9303_rcv(struct sk_buff *skb, struct net_device *dev,
> > + struct packet_type *pt, struct net_device *orig_dev)
> > +{
> > + u16 *lan9303_tag;
> > + struct dsa_switch_tree *dst = dev->dsa_ptr;
> > + struct dsa_switch *ds = dst->ds[0];
> > + unsigned int source_port;
> > +
> > + if (unlikely(!dst)) {
> > + dev_warn_ratelimited(&dev->dev, "Dropping packet, due to
> > missing switch tree device\n");
> > + goto out_drop;
> > + }
>
> By the time you get here, you have already dereferenced dst, in order
> to get ds. So this is pointless.
Ups! Thanks! Fixed in v2.
> > + lan9303_tag = (u16 *)(skb->data - 2);
> > +
> > + if (lan9303_tag[0] != htons(0x8100)) {
> > + dev_warn_ratelimited(&dev->dev, "Dropping packet due to invalid
> > VLAN marker\n");
> > + goto out_drop;
> > + }
>
> In the transmit function, you use ETH_P_8021Q, please do so here as
> well.
Done in v2.
> > + source_port = ntohs(lan9303_tag[1]) & 0x3;
> > +
> > + if (source_port >= DSA_MAX_PORTS) {
> > + dev_warn_ratelimited(&dev->dev, "Dropping packet due to invalid
> > source port\n");
> > + goto out_drop;
> > + }
>
> You can be more specific here. For this hardware, > 3 is invalid and
> should be dropped. If we later add other chips which have more ports,
> we can relax this check then.
Done in v2.
> > + /* remove the special VLAN tag between the MAC addresses
> > + * and the current ethertype field.
> > + */
> > + skb_pull_rcsum(skb, 2 + 2);
> > + memmove(skb->data - ETH_HLEN, skb->data - (ETH_HLEN + LAN9303_TAG_LEN),
> > + 2 * ETH_ALEN);
> > + skb_push(skb, ETH_HLEN);
>
> Do you need to do anything with the checksum here? Other tagging
> protocols do.
Don't know exactly what you are meaning here. For me it does the same like
the qca_tag_rcv() function in tag_qca.c does.
Juergen
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