Messages in this thread | | | Subject | Re: [PATCH net-next 2/3] net: dsa: mediatek: combine MediaTek tag with VLAN tag | From | Sean Wang <> | Date | Tue, 12 Dec 2017 16:40:34 +0800 |
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On Tue, 2017-12-12 at 09:28 +0100, Andrew Lunn wrote: > On Tue, Dec 12, 2017 at 03:21:21PM +0800, Sean Wang wrote: > > On Thu, 2017-12-07 at 16:30 +0100, Andrew Lunn wrote: > > > > @@ -25,20 +28,37 @@ static struct sk_buff *mtk_tag_xmit(struct sk_buff *skb, > > > > { > > > > struct dsa_port *dp = dsa_slave_to_port(dev); > > > > u8 *mtk_tag; > > > > + bool is_vlan_skb = true; > > > > > > .. > > > > > > > + /* Mark tag attribute on special tag insertion to notify hardware > > > > + * whether that's a combined special tag with 802.1Q header. > > > > + */ > > > > + mtk_tag[0] = is_vlan_skb ? MTK_HDR_XMIT_TAGGED_TPID_8100 : > > > > + MTK_HDR_XMIT_UNTAGGED; > > > > mtk_tag[1] = (1 << dp->index) & MTK_HDR_XMIT_DP_BIT_MASK; > > > > - mtk_tag[2] = 0; > > > > - mtk_tag[3] = 0; > > > > + > > > > + /* Tag control information is kept for 802.1Q */ > > > > + if (!is_vlan_skb) { > > > > + mtk_tag[2] = 0; > > > > + mtk_tag[3] = 0; > > > > + } > > > > > > > > return skb; > > > > } > > > > > > Hi Sean > > > > > > So you can mark a packet for egress. What about ingress? How do you > > > know the VLAN/PORT combination for packets the CPU receives? I would > > > of expected a similar change to mtk_tag_rcv(). > > > > > > Andrew > > > > Hi, Andrew > > > > It's unnecessary for extra handling in mtk_tag_rcv() when VLAN tag is > > present since it is able to put the VLAN tag after the special tag and > > then follow the existing way to parse. > > Hi Sean > > O.K. Please mention this in the commit message. Since it was something > i was expecting, it should be documented why it is not needed. > > Thanks > Andrew
Sure. I will add this in the commit message.
Sean
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