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authorPatrick Ohly <patrick.ohly@intel.com>2009-02-12 05:03:36 +0000
committerDavid S. Miller <davem@davemloft.net>2009-02-15 22:43:33 -0800
commitcb9eff097831007afb30d64373f29d99825d0068 (patch)
tree823a5668c6f4b3f577a1d4cc73b3df2d7e33c5c4 /include/linux/sockios.h
parenta75244c3d519fcb490ca2bf3f123c98017f1e8d0 (diff)
downloadtalos-op-linux-cb9eff097831007afb30d64373f29d99825d0068.tar.gz
talos-op-linux-cb9eff097831007afb30d64373f29d99825d0068.zip
net: new user space API for time stamping of incoming and outgoing packets
User space can request hardware and/or software time stamping. Reporting of the result(s) via a new control message is enabled separately for each field in the message because some of the fields may require additional computation and thus cause overhead. User space can tell the different kinds of time stamps apart and choose what suits its needs. When a TX timestamp operation is requested, the TX skb will be cloned and the clone will be time stamped (in hardware or software) and added to the socket error queue of the skb, if the skb has a socket associated with it. The actual TX timestamp will reach userspace as a RX timestamp on the cloned packet. If timestamping is requested and no timestamping is done in the device driver (potentially this may use hardware timestamping), it will be done in software after the device's start_hard_xmit routine. Signed-off-by: Patrick Ohly <patrick.ohly@intel.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include/linux/sockios.h')
-rw-r--r--include/linux/sockios.h3
1 files changed, 3 insertions, 0 deletions
diff --git a/include/linux/sockios.h b/include/linux/sockios.h
index abef7596655a..241f179347d9 100644
--- a/include/linux/sockios.h
+++ b/include/linux/sockios.h
@@ -122,6 +122,9 @@
#define SIOCBRADDIF 0x89a2 /* add interface to bridge */
#define SIOCBRDELIF 0x89a3 /* remove interface from bridge */
+/* hardware time stamping: parameters in linux/net_tstamp.h */
+#define SIOCSHWTSTAMP 0x89b0
+
/* Device private ioctl calls */
/*
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