From 7a51384cc9f4145de352d266821b63f1bb0d46ff Mon Sep 17 00:00:00 2001 From: Daniel Borkmann Date: Tue, 23 Apr 2013 00:39:29 +0000 Subject: [PATCH] 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 Acked-by: Willem de Bruijn Signed-off-by: David S. Miller --- net/packet/af_packet.c | 50 +++++++++++++++++++++++++------------------------- 1 file changed, 25 insertions(+), 25 deletions(-) diff --git a/net/packet/af_packet.c b/net/packet/af_packet.c index ec8ea27..9d46a07 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); } -- 2.7.4