[NET]: convert network timestamps to ktime_t
We currently use a special structure (struct skb_timeval) and plain
'struct timeval' to store packet timestamps in sk_buffs and struct
sock.
This has some drawbacks :
- Fixed resolution of micro second.
- Waste of space on 64bit platforms where sizeof(struct timeval)=16
I suggest using ktime_t that is a nice abstraction of high resolution
time services, currently capable of nanosecond resolution.
As sizeof(ktime_t) is 8 bytes, using ktime_t in 'struct sock' permits
a 8 byte shrink of this structure on 64bit architectures. Some other
structures also benefit from this size reduction (struct ipq in
ipv4/ip_fragment.c, struct frag_queue in ipv6/reassembly.c, ...)
Once this ktime infrastructure adopted, we can more easily provide
nanosecond resolution on top of it. (ioctl SIOCGSTAMPNS and/or
SO_TIMESTAMPNS/SCM_TIMESTAMPNS)
Note : this patch includes a bug correction in
compat_sock_get_timestamp() where a "err = 0;" was missing (so this
syscall returned -ENOENT instead of 0)
Signed-off-by: Eric Dumazet <dada1@cosmosbay.com>
CC: Stephen Hemminger <shemminger@linux-foundation.org>
CC: John find <linux.kernel@free.fr>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/netfilter/nfnetlink_queue.c b/net/netfilter/nfnetlink_queue.c
index d9ce4a7..cfbee39 100644
--- a/net/netfilter/nfnetlink_queue.c
+++ b/net/netfilter/nfnetlink_queue.c
@@ -495,11 +495,11 @@
NFA_PUT(skb, NFQA_HWADDR, sizeof(phw), &phw);
}
- if (entskb->tstamp.off_sec) {
+ if (entskb->tstamp.tv64) {
struct nfqnl_msg_packet_timestamp ts;
-
- ts.sec = cpu_to_be64(entskb->tstamp.off_sec);
- ts.usec = cpu_to_be64(entskb->tstamp.off_usec);
+ struct timeval tv = ktime_to_timeval(entskb->tstamp);
+ ts.sec = cpu_to_be64(tv.tv_sec);
+ ts.usec = cpu_to_be64(tv.tv_usec);
NFA_PUT(skb, NFQA_TIMESTAMP, sizeof(ts), &ts);
}