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Commit ac7686b9 authored by Atzm Watanabe's avatar Atzm Watanabe Committed by David S. Miller
Browse files

packet: doc: add documentation for VLAN TPID delivery 



Introduce TP_STATUS_VLAN_TPID_VALID bit into the documentation.

Signed-off-by: default avatarAtzm Watanabe <atzm@stratosphere.co.jp>
Acked-by: default avatarDaniel Borkmann <dborkman@redhat.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent ac0917f2

Documentation/networking/packet_mmap.txt

+7 −2
Original line number Diff line number Diff line
@@ -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