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Message-Id: <1620085579-5646-1-git-send-email-rsanger@wand.net.nz> Date: Tue, 4 May 2021 11:46:19 +1200 From: Richard Sanger <rsanger@...d.net.nz> To: netdev@...r.kernel.org Cc: Richard Sanger <rsanger@...d.net.nz> Subject: [PATCH] net: packetmmap: fix only tx timestamp on request The packetmmap tx ring should only return timestamps if requested, 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. Signed-off-by: Richard Sanger <rsanger@...d.net.nz> --- net/packet/af_packet.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-) diff --git a/net/packet/af_packet.c b/net/packet/af_packet.c index ba96db1..b69805e 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 +2341,10 @@ 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 */ + 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
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