netdev - [PATCH] packet: doc: add documentation for VLAN TPID delivery

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Date:	Fri, 20 Dec 2013 23:12:20 +0900
From:	Atzm Watanabe <atzm@...atosphere.co.jp>
To:	netdev@...r.kernel.org
Subject: [PATCH] packet: doc: add documentation for VLAN TPID delivery

Introduce TP_STATUS_VLAN_TPID_VALID bit into the documentation.

Signed-off-by: Atzm Watanabe <atzm@...atosphere.co.jp>
---
In the PACKET_MMAP, TP_STATUS_VLAN_VALID seems to be not
available in the V1, so I moved it into the V2.

 Documentation/networking/packet_mmap.txt | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/Documentation/networking/packet_mmap.txt b/Documentation/networking/packet_mmap.txt
index 4288ffa..723bf3d 100644
--- a/Documentation/networking/packet_mmap.txt
+++ b/Documentation/networking/packet_mmap.txt
@@ -517,8 +517,6 @@ where 'tpacket_version' can be TPACKET_V1 (default), TPACKET_V2, TPACKET_V3.
 TPACKET_V1:
 	- Default if not otherwise specified by setsockopt(2)
 	- RX_RING, TX_RING available
-	- VLAN metadata information available for packets
-	  (TP_STATUS_VLAN_VALID)
 
 TPACKET_V1 --> TPACKET_V2:
 	- Made 64 bit clean due to unsigned long usage in TPACKET_V1
@@ -526,6 +524,13 @@ TPACKET_V1 --> TPACKET_V2:
 	  userspace and the like
 	- Timestamp resolution in nanoseconds instead of microseconds
 	- RX_RING, TX_RING available
+	- VLAN metadata information available for packets
+	  (TP_STATUS_VLAN_VALID, TP_STATUS_VLAN_TPID_VALID),
+	  in the tpacket2_hdr structure:
+		- TP_STATUS_VLAN_VALID bit being set into the tp_status field indicates
+		  that the tp_vlan_tci field has valid VLAN TCI value
+		- TP_STATUS_VLAN_TPID_VALID bit being set into the tp_status field
+		  indicates that the tp_vlan_tpid field has valid VLAN TPID value
 	- How to switch to TPACKET_V2:
 		1. Replace struct tpacket_hdr by struct tpacket2_hdr
 		2. Query header len and save
-- 
1.8.1.5

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