How to get the timestamp of linux kernel?

how to get the timetamp for the linux kernel?

• int netif_rx(struct sk_buff *skb) { if(skb -> stamp.tv_sec ==0) do_gettimeofday(&skb->stamp); } the above api is the receiver side api, which receives the data from the sender. I want to calculate t he time when it receives the data and store it in a buffer. the above api at line number 2993 is available in kernel source code at: /linux/net/core/dev.c but I am getting ERROR: as struct sk_buff has no member named stamp. http://lxr.free-electrons.com/source/include/linux/skbuff.h Could someone please help me : how to get the timestamp for linux kernel. Later I changed my code to : int netif_rx(struct sk_buff *skb) { if(skb -> tstamp.off_sec ==0) do_gettimeofday(&skb->tstamp); } now I am getting error as : ktime_t has no memeber named "tv_sec". struct timeval but argument is of type unio ktime_t.

• Answer:

  sk_buff->tstamp is variable of ktime_t type. do_gettimeofday sets time to variable of struct timeval. You have different types here and so you need a conversion. A simple one would be: int netif_rx(struct sk_buff *skb) { if(skb -> tstamp.off_sec ==0) { struct timespec now; getnstimeofday(&now); skb->tstamp = timespec_to_ktime(now); } }