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authorAtzm Watanabe <atzm@stratosphere.co.jp>2013-12-20 18:12:20 +0400
committerDavid S. Miller <davem@davemloft.net>2013-12-21 09:01:40 +0400
commitac7686b9698038cdf5148c9904db907448dceca4 (patch)
treeafc094555d3cf0fc17732cbf41b1c74586e7f83c /Documentation/networking/packet_mmap.txt
parentac0917f250c61ae1e395844ebd924db0e07d1f87 (diff)
downloadlinux-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.txt9
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