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