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authorDaniel Borkmann <dborkman@redhat.com>2013-04-23 04:39:29 +0400
committerDavid S. Miller <davem@davemloft.net>2013-04-25 09:22:22 +0400
commit7a51384cc9f4145de352d266821b63f1bb0d46ff (patch)
treedf7b1de730a738dd537fba17b6e17aec509d812e /net/packet
parent2e31396fa14be50a98c5d2b00416ebd74d381c1f (diff)
downloadlinux-7a51384cc9f4145de352d266821b63f1bb0d46ff.tar.xz
packet: enable hardware tx timestamping on tpacket ring
Currently, we only have software timestamping for the TX ring buffer path, but this limitation stems rather from the implementation. By just reusing tpacket_get_timestamp(), we can also allow hardware timestamping just as in the RX path. Signed-off-by: Daniel Borkmann <dborkman@redhat.com> Acked-by: Willem de Bruijn <willemb@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/packet')
-rw-r--r--net/packet/af_packet.c50
1 files changed, 25 insertions, 25 deletions
diff --git a/net/packet/af_packet.c b/net/packet/af_packet.c
index ec8ea27733ac..9d46a07a15c0 100644
--- a/net/packet/af_packet.c
+++ b/net/packet/af_packet.c
@@ -339,14 +339,33 @@ static int __packet_get_status(struct packet_sock *po, void *frame)
}
}
+static bool 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 true;
+ if ((flags & SOF_TIMESTAMPING_RAW_HARDWARE) &&
+ ktime_to_timespec_cond(shhwtstamps->hwtstamp, ts))
+ return true;
+ }
+
+ if (ktime_to_timespec_cond(skb->tstamp, ts))
+ return true;
+
+ return false;
+}
+
static void __packet_set_timestamp(struct packet_sock *po, void *frame,
- ktime_t tstamp)
+ struct sk_buff *skb)
{
union tpacket_uhdr h;
struct timespec ts;
- if (!ktime_to_timespec_cond(tstamp, &ts) ||
- !sock_flag(&po->sk, SOCK_TIMESTAMPING_SOFTWARE))
+ if (!tpacket_get_timestamp(skb, &ts, po->tp_tstamp))
return;
h.raw = frame;
@@ -1688,26 +1707,6 @@ 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)
{
@@ -1804,7 +1803,8 @@ 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);
+ if (!tpacket_get_timestamp(skb, &ts, po->tp_tstamp))
+ getnstimeofday(&ts);
switch (po->tp_version) {
case TPACKET_V1:
@@ -1908,7 +1908,7 @@ static void tpacket_destruct_skb(struct sk_buff *skb)
ph = skb_shinfo(skb)->destructor_arg;
BUG_ON(atomic_read(&po->tx_ring.pending) == 0);
atomic_dec(&po->tx_ring.pending);
- __packet_set_timestamp(po, ph, skb->tstamp);
+ __packet_set_timestamp(po, ph, skb);
__packet_set_status(po, ph, TP_STATUS_AVAILABLE);
}