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packet: move hw/sw timestamp extraction into a small helper 

This patch introduces a small, internal helper function, that is used by
PF_PACKET. Based on the flags that are passed, it extracts the packet
timestamp in the receive path. This is merely a refactoring to remove
some duplicate code in tpacket_rcv(), to make it more readable, and to
enable others to use this function in PF_PACKET as well, e.g. for TX.

Signed-off-by: Daniel Borkmann <dborkman@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Daniel Borkmann 2013-04-16 01:29:11 +00:00 committed by David S. Miller
parent 6e94d1ef37
commit 4b457bdf1d
1 changed files with 23 additions and 34 deletions
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57
net/packet/af_packet.c
View File

@ -1657,6 +1657,26 @@ drop:
return 0;
}
static void tpacket_get_timestamp(struct sk_buff *skb, struct timespec *ts,
unsigned int flags)
{
struct skb_shared_hwtstamps *shhwtstamps = skb_hwtstamps(skb);
if (shhwtstamps) {
if ((flags & SOF_TIMESTAMPING_SYS_HARDWARE) &&
ktime_to_timespec_cond(shhwtstamps->syststamp, ts))
return;
if ((flags & SOF_TIMESTAMPING_RAW_HARDWARE) &&
ktime_to_timespec_cond(shhwtstamps->hwtstamp, ts))
return;
}
if (ktime_to_timespec_cond(skb->tstamp, ts))
return;
getnstimeofday(ts);
}
static int tpacket_rcv(struct sk_buff *skb, struct net_device *dev,
struct packet_type *pt, struct net_device *orig_dev)
{
@ -1670,9 +1690,7 @@ static int tpacket_rcv(struct sk_buff *skb, struct net_device *dev,
unsigned long status = TP_STATUS_USER;
unsigned short macoff, netoff, hdrlen;
struct sk_buff *copy_skb = NULL;
struct timeval tv;
struct timespec ts;
struct skb_shared_hwtstamps *shhwtstamps = skb_hwtstamps(skb);
if (skb->pkt_type == PACKET_LOOPBACK)
goto drop;
@ -1755,6 +1773,7 @@ static int tpacket_rcv(struct sk_buff *skb, struct net_device *dev,
spin_unlock(&sk->sk_receive_queue.lock);
skb_copy_bits(skb, 0, h.raw + macoff, snaplen);
tpacket_get_timestamp(skb, &ts, po->tp_tstamp);
switch (po->tp_version) {
case TPACKET_V1:
@ -1762,18 +1781,8 @@ static int tpacket_rcv(struct sk_buff *skb, struct net_device *dev,
h.h1->tp_snaplen = snaplen;
h.h1->tp_mac = macoff;
h.h1->tp_net = netoff;
if ((po->tp_tstamp & SOF_TIMESTAMPING_SYS_HARDWARE)
&& shhwtstamps->syststamp.tv64)
tv = ktime_to_timeval(shhwtstamps->syststamp);
else if ((po->tp_tstamp & SOF_TIMESTAMPING_RAW_HARDWARE)
&& shhwtstamps->hwtstamp.tv64)
tv = ktime_to_timeval(shhwtstamps->hwtstamp);
else if (skb->tstamp.tv64)
tv = ktime_to_timeval(skb->tstamp);
else
do_gettimeofday(&tv);
h.h1->tp_sec = tv.tv_sec;
h.h1->tp_usec = tv.tv_usec;
h.h1->tp_sec = ts.tv_sec;
h.h1->tp_usec = ts.tv_nsec / NSEC_PER_USEC;
hdrlen = sizeof(*h.h1);
break;
case TPACKET_V2:
@ -1781,16 +1790,6 @@ static int tpacket_rcv(struct sk_buff *skb, struct net_device *dev,
h.h2->tp_snaplen = snaplen;
h.h2->tp_mac = macoff;
h.h2->tp_net = netoff;
if ((po->tp_tstamp & SOF_TIMESTAMPING_SYS_HARDWARE)
&& shhwtstamps->syststamp.tv64)
ts = ktime_to_timespec(shhwtstamps->syststamp);
else if ((po->tp_tstamp & SOF_TIMESTAMPING_RAW_HARDWARE)
&& shhwtstamps->hwtstamp.tv64)
ts = ktime_to_timespec(shhwtstamps->hwtstamp);
else if (skb->tstamp.tv64)
ts = ktime_to_timespec(skb->tstamp);
else
getnstimeofday(&ts);
h.h2->tp_sec = ts.tv_sec;
h.h2->tp_nsec = ts.tv_nsec;
if (vlan_tx_tag_present(skb)) {
@ -1811,16 +1810,6 @@ static int tpacket_rcv(struct sk_buff *skb, struct net_device *dev,
h.h3->tp_snaplen = snaplen;
h.h3->tp_mac = macoff;
h.h3->tp_net = netoff;
if ((po->tp_tstamp & SOF_TIMESTAMPING_SYS_HARDWARE)
&& shhwtstamps->syststamp.tv64)
ts = ktime_to_timespec(shhwtstamps->syststamp);
else if ((po->tp_tstamp & SOF_TIMESTAMPING_RAW_HARDWARE)
&& shhwtstamps->hwtstamp.tv64)
ts = ktime_to_timespec(shhwtstamps->hwtstamp);
else if (skb->tstamp.tv64)
ts = ktime_to_timespec(skb->tstamp);
else
getnstimeofday(&ts);
h.h3->tp_sec = ts.tv_sec;
h.h3->tp_nsec = ts.tv_nsec;
hdrlen = sizeof(*h.h3);