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packet: doc: add documentation for VLAN TPID delivery 

Introduce TP_STATUS_VLAN_TPID_VALID bit into the documentation.

Signed-off-by: Atzm Watanabe <atzm@stratosphere.co.jp>
Acked-by: Daniel Borkmann <dborkman@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Atzm Watanabe 2013-12-20 23:12:20 +09:00 committed by David S. Miller
parent ac0917f250
commit ac7686b969
1 changed files with 7 additions and 2 deletions
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9
Documentation/networking/packet_mmap.txt
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@ -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