From: Richard Sanger <rsanger@wand.net.nz>
To: netdev@vger.kernel.org
Cc: Richard Sanger <rsanger@wand.net.nz>,
Daniel Borkmann <daniel@iogearbox.net>,
Willem de Bruijn <willemdebruijn.kernel@gmail.com>
Subject: [PATCH v2] net: packetmmap: fix only tx timestamp on request
Date: Wed, 12 May 2021 13:31:22 +1200 [thread overview]
Message-ID: <1620783082-28906-1-git-send-email-rsanger@wand.net.nz> (raw)
The packetmmap tx ring should only return timestamps if requested via
setsockopt PACKET_TIMESTAMP, as documented. This allows compatibility
with non-timestamp aware user-space code which checks
tp_status == TP_STATUS_AVAILABLE; not expecting additional timestamp
flags to be set in tp_status.
Fixes: b9c32fb27170 ("packet: if hw/sw ts enabled in rx/tx ring, report which ts we got")
Cc: Daniel Borkmann <daniel@iogearbox.net>
Cc: Willem de Bruijn <willemdebruijn.kernel@gmail.com>
Signed-off-by: Richard Sanger <rsanger@wand.net.nz>
---
net/packet/af_packet.c | 10 ++++++++--
1 file changed, 8 insertions(+), 2 deletions(-)
diff --git a/net/packet/af_packet.c b/net/packet/af_packet.c
index ba96db1..ae906eb 100644
--- a/net/packet/af_packet.c
+++ b/net/packet/af_packet.c
@@ -422,7 +422,8 @@ static __u32 tpacket_get_timestamp(struct sk_buff *skb, struct timespec64 *ts,
ktime_to_timespec64_cond(shhwtstamps->hwtstamp, ts))
return TP_STATUS_TS_RAW_HARDWARE;
- if (ktime_to_timespec64_cond(skb->tstamp, ts))
+ if ((flags & SOF_TIMESTAMPING_SOFTWARE) &&
+ ktime_to_timespec64_cond(skb->tstamp, ts))
return TP_STATUS_TS_SOFTWARE;
return 0;
@@ -2340,7 +2341,12 @@ static int tpacket_rcv(struct sk_buff *skb, struct net_device *dev,
skb_copy_bits(skb, 0, h.raw + macoff, snaplen);
- if (!(ts_status = tpacket_get_timestamp(skb, &ts, po->tp_tstamp)))
+ /* Always timestamp; prefer an existing software timestamp taken
+ * closer to the time of capture.
+ */
+ ts_status = tpacket_get_timestamp(skb, &ts,
+ po->tp_tstamp | SOF_TIMESTAMPING_SOFTWARE);
+ if (!ts_status)
ktime_get_real_ts64(&ts);
status |= ts_status;
--
2.7.4
next reply other threads:[~2021-05-12 1:32 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-05-12 1:31 Richard Sanger [this message]
2021-05-12 14:24 ` [PATCH v2] net: packetmmap: fix only tx timestamp on request Willem de Bruijn
2021-05-12 22:01 ` Richard Sanger
2021-05-12 21:10 ` patchwork-bot+netdevbpf
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