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| author | Eric Dumazet <dada1@cosmosbay.com> | 2007-04-19 16:16:32 -0700 |
|---|---|---|
| committer | David S. Miller <davem@sunset.davemloft.net> | 2007-04-25 22:23:34 -0700 |
| commit | b7aa0bf70c4afb9e38be25f5c0922498d0f8684c (patch) | |
| tree | 4bc9d61031f4eb40d73887d6bde09e7d6bf2b259 /net/sunrpc | |
| parent | 3927f2e8f9afa3424bb51ca81f7abac01ffd0005 (diff) | |
| download | linux-b7aa0bf70c4afb9e38be25f5c0922498d0f8684c.tar.gz linux-b7aa0bf70c4afb9e38be25f5c0922498d0f8684c.tar.bz2 linux-b7aa0bf70c4afb9e38be25f5c0922498d0f8684c.zip | |
[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>
Diffstat (limited to 'net/sunrpc')
| -rw-r--r-- | net/sunrpc/svcsock.c | 10 |
1 files changed, 3 insertions, 7 deletions
diff --git a/net/sunrpc/svcsock.c b/net/sunrpc/svcsock.c index 2772fee93881..22f61aee4824 100644 --- a/net/sunrpc/svcsock.c +++ b/net/sunrpc/svcsock.c @@ -798,16 +798,12 @@ svc_udp_recvfrom(struct svc_rqst *rqstp) dprintk("svc: recvfrom returned error %d\n", -err); } rqstp->rq_addrlen = sizeof(rqstp->rq_addr); - if (skb->tstamp.off_sec == 0) { - struct timeval tv; - - tv.tv_sec = xtime.tv_sec; - tv.tv_usec = xtime.tv_nsec / NSEC_PER_USEC; - skb_set_timestamp(skb, &tv); + if (skb->tstamp.tv64 == 0) { + skb->tstamp = ktime_get_real(); /* Don't enable netstamp, sunrpc doesn't need that much accuracy */ } - skb_get_timestamp(skb, &svsk->sk_sk->sk_stamp); + svsk->sk_sk->sk_stamp = skb->tstamp; set_bit(SK_DATA, &svsk->sk_flags); /* there may be more data... */ /* |