netdev - [PATCH net-next v1 1/7] igb: clear out tstamp after sending the packet.

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Message-Id: <1559065608-27888-2-git-send-email-vedang.patel@intel.com>
Date:   Tue, 28 May 2019 10:46:42 -0700
From:   Vedang Patel <vedang.patel@...el.com>
To:     netdev@...r.kernel.org
Cc:     jeffrey.t.kirsher@...el.com, davem@...emloft.net, jhs@...atatu.com,
        xiyou.wangcong@...il.com, jiri@...nulli.us,
        intel-wired-lan@...ts.osuosl.org, vinicius.gomes@...el.com,
        l@...ileo.org, Vedang Patel <vedang.patel@...el.com>
Subject: [PATCH net-next v1 1/7] igb: clear out tstamp after sending the packet.

skb->tstamp is being used at multiple places. On the transmit side, it
is used to determine the launchtime of the packet. It is also used to
determine the software timestamp after the packet has been transmitted.

So, clear out the tstamp value after it has been read so that we do not
report false software timestamp on the receive side.

Signed-off-by: Vedang Patel <vedang.patel@...el.com>
---
 drivers/net/ethernet/intel/igb/igb_main.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/net/ethernet/intel/igb/igb_main.c b/drivers/net/ethernet/intel/igb/igb_main.c
index 39f33afc479c..005c1693efc8 100644
--- a/drivers/net/ethernet/intel/igb/igb_main.c
+++ b/drivers/net/ethernet/intel/igb/igb_main.c
@@ -5687,6 +5687,7 @@ static void igb_tx_ctxtdesc(struct igb_ring *tx_ring,
 	 */
 	if (tx_ring->launchtime_enable) {
 		ts = ns_to_timespec64(first->skb->tstamp);
+		first->skb->tstamp = 0;
 		context_desc->seqnum_seed = cpu_to_le32(ts.tv_nsec / 32);
 	} else {
 		context_desc->seqnum_seed = 0;
-- 
2.17.0