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authorEric Dumazet <dada1@cosmosbay.com>2007-04-20 03:16:32 +0400
committerDavid S. Miller <davem@sunset.davemloft.net>2007-04-26 09:23:34 +0400
commitb7aa0bf70c4afb9e38be25f5c0922498d0f8684c (patch)
tree4bc9d61031f4eb40d73887d6bde09e7d6bf2b259 /net/packet
parent3927f2e8f9afa3424bb51ca81f7abac01ffd0005 (diff)
downloadlinux-b7aa0bf70c4afb9e38be25f5c0922498d0f8684c.tar.xz
[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/packet')
-rw-r--r--net/packet/af_packet.c8
1 files changed, 5 insertions, 3 deletions
diff --git a/net/packet/af_packet.c b/net/packet/af_packet.c
index 28d47e8f2873..f9866a8456a1 100644
--- a/net/packet/af_packet.c
+++ b/net/packet/af_packet.c
@@ -582,6 +582,7 @@ static int tpacket_rcv(struct sk_buff *skb, struct net_device *dev, struct packe
unsigned long status = TP_STATUS_LOSING|TP_STATUS_USER;
unsigned short macoff, netoff;
struct sk_buff *copy_skb = NULL;
+ struct timeval tv;
if (skb->pkt_type == PACKET_LOOPBACK)
goto drop;
@@ -656,12 +657,13 @@ static int tpacket_rcv(struct sk_buff *skb, struct net_device *dev, struct packe
h->tp_snaplen = snaplen;
h->tp_mac = macoff;
h->tp_net = netoff;
- if (skb->tstamp.off_sec == 0) {
+ if (skb->tstamp.tv64 == 0) {
__net_timestamp(skb);
sock_enable_timestamp(sk);
}
- h->tp_sec = skb->tstamp.off_sec;
- h->tp_usec = skb->tstamp.off_usec;
+ tv = ktime_to_timeval(skb->tstamp);
+ h->tp_sec = tv.tv_sec;
+ h->tp_usec = tv.tv_usec;
sll = (struct sockaddr_ll*)((u8*)h + TPACKET_ALIGN(sizeof(*h)));
sll->sll_halen = 0;