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| author | Atzm Watanabe <atzm@stratosphere.co.jp> | 2013-12-20 18:12:20 +0400 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2013-12-21 09:01:40 +0400 |
| commit | ac7686b9698038cdf5148c9904db907448dceca4 (patch) | |
| tree | afc094555d3cf0fc17732cbf41b1c74586e7f83c /Documentation/networking/packet_mmap.txt | |
| parent | ac0917f250c61ae1e395844ebd924db0e07d1f87 (diff) | |
| download | linux-ac7686b9698038cdf5148c9904db907448dceca4.tar.xz | |
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>
Diffstat (limited to 'Documentation/networking/packet_mmap.txt')
| -rw-r--r-- | Documentation/networking/packet_mmap.txt | 9 |
1 files changed, 7 insertions, 2 deletions
diff --git a/Documentation/networking/packet_mmap.txt b/Documentation/networking/packet_mmap.txt index 4288ffafba9f..723bf3d33a6e 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 |