On 12/18/19 12:08 PM, Michael Grzeschik wrote:

Add DSA tag code for Microchip KSZ8863 switch.

Signed-off-by: Michael Grzeschik <redacted>
---

[snip]

+/* For ingress (Host -> KSZ8863), 1 byte is added before FCS.
+ * ---------------------------------------------------------------------------
+ * DA(6bytes)|SA(6bytes)|....|Data(nbytes)|tag0(1byte)|tag1(1byte)|FCS(4bytes)
+ * ---------------------------------------------------------------------------
+ * tag0[1,0] : represents port
+ *             (e.g. 0b00=addr-lookup 0b01=port1, 0b10=port2, 0b11=port1+port2)
+ * tag0[3,2] : bits two and three represent prioritization
+ *             (e.g. 0b00xx=prio0, 0b01xx=prio1, 0b10xx=prio2, 0b11xx=prio3)
+ *
+ * For egress (KSZ8873 -> Host), 1 byte is added before FCS.
+ * ---------------------------------------------------------------------------
+ * DA(6bytes)|SA(6bytes)|....|Data(nbytes)|tag0(1byte)|FCS(4bytes)
+ * ---------------------------------------------------------------------------
+ * tag0[0]   : zero-based value represents port
+ *             (eg, 0b0=port1, 0b1=port2)
+ */

And another way to define a tag, snowflake after snowflake... anyway:

Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
-- 
Florian