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| author | Scott McMillan <scott.a.mcmillan@intel.com> | 2010-06-02 05:53:56 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2010-06-02 05:53:56 -0700 |
| commit | 614f60fa9d73a9e8fdff3df83381907fea7c5649 (patch) | |
| tree | a1b7704393b7042242470db09d59944bca67ec51 /include/linux/if_packet.h | |
| parent | 7dad171c39dc83bd267c4f98d8b02d38e0d65596 (diff) | |
| download | linux-614f60fa9d73a9e8fdff3df83381907fea7c5649.tar.gz linux-614f60fa9d73a9e8fdff3df83381907fea7c5649.tar.bz2 linux-614f60fa9d73a9e8fdff3df83381907fea7c5649.zip | |
packet_mmap: expose hw packet timestamps to network packet capture utilities
This patch adds a setting, PACKET_TIMESTAMP, to specify the packet
timestamp source that is exported to capture utilities like tcpdump by
packet_mmap.
PACKET_TIMESTAMP accepts the same integer bit field as
SO_TIMESTAMPING. However, only the SOF_TIMESTAMPING_SYS_HARDWARE and
SOF_TIMESTAMPING_RAW_HARDWARE values are currently recognized by
PACKET_TIMESTAMP. SOF_TIMESTAMPING_SYS_HARDWARE takes precedence over
SOF_TIMESTAMPING_RAW_HARDWARE if both bits are set.
If PACKET_TIMESTAMP is not set, a software timestamp generated inside
the networking stack is used (the behavior before this setting was
added).
Signed-off-by: Scott McMillan <scott.a.mcmillan@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include/linux/if_packet.h')
| -rw-r--r-- | include/linux/if_packet.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/if_packet.h b/include/linux/if_packet.h index 6ac23ef1801a..72bfa5a034dd 100644 --- a/include/linux/if_packet.h +++ b/include/linux/if_packet.h @@ -48,6 +48,7 @@ struct sockaddr_ll { #define PACKET_LOSS 14 #define PACKET_VNET_HDR 15 #define PACKET_TX_TIMESTAMP 16 +#define PACKET_TIMESTAMP 17 struct tpacket_stats { unsigned int tp_packets; |