netdev - [RFC PATCH net-next 1/2] net: dcb: add new pcp selector to app object

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Message-ID: <20220908120442.3069771-2-daniel.machon@microchip.com>
Date:   Thu, 8 Sep 2022 14:04:41 +0200
From:   Daniel Machon <daniel.machon@...rochip.com>
To:     <netdev@...r.kernel.org>
CC:     <Allan.Nielsen@...rochip.com>, <UNGLinuxDriver@...rochip.com>,
        <maxime.chevallier@...tlin.com>, <vladimir.oltean@....com>,
        <petrm@...dia.com>, <kuba@...nel.org>, <vinicius.gomes@...el.com>,
        <thomas.petazzoni@...tlin.com>,
        Daniel Machon <daniel.machon@...rochip.com>
Subject: [RFC PATCH net-next 1/2] net: dcb: add new pcp selector to app object

Add new PCP selector for the 8021Qaz APP managed object.

The purpose of adding the PCP selector, is to be able to offload
PCP-based queue classification to the 8021Q Priority Code Point table,
see 6.9.3 of IEEE Std 802.1Q-2018.

PCP and DEI is encoded in the protocol field as 8*dei+pcp, so that a
mapping of PCP 2 and DEI 1 to priority 3 is encoded as {255, 10, 3}.

While PCP is not a standard 8021Qaz selector, it seems very convenient
to add it to the APP object, as this is where similar priority mapping
is handled, and it perfectly fits the {selector, protocol, priority}
triplet.

Signed-off-by: Daniel Machon <daniel.machon@...rochip.com>
---
 include/uapi/linux/dcbnl.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/include/uapi/linux/dcbnl.h b/include/uapi/linux/dcbnl.h
index a791a94013a6..8eab16e5bc13 100644
--- a/include/uapi/linux/dcbnl.h
+++ b/include/uapi/linux/dcbnl.h
@@ -217,6 +217,7 @@ struct cee_pfc {
 #define IEEE_8021QAZ_APP_SEL_DGRAM	3
 #define IEEE_8021QAZ_APP_SEL_ANY	4
 #define IEEE_8021QAZ_APP_SEL_DSCP       5
+#define IEEE_8021QAZ_APP_SEL_PCP	255

 /* This structure contains the IEEE 802.1Qaz APP managed object. This
  * object is also used for the CEE std as well.
-- 
2.34.1