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packet_mmap: expose hw packet timestamps to network packet capture utilities

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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>
This commit is contained in:
Scott McMillan 2010-06-02 05:53:56 -07:00 • committed by David S. Miller
parent 7dad171c39
commit 614f60fa9d
3 changed files with 62 additions and 2 deletions
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1
include/linux/if_packet.h
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@ -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;