From 2ea4dc28a5bcec408e01a8772763871638a5ec79 Mon Sep 17 00:00:00 2001
From: Alexandre Rames <arames@solarflare.com>
Date: Fri, 8 Nov 2013 10:20:31 +0000
Subject: [PATCH] sfc: Stop/re-start PTP when stopping/starting the datapath.

This disables PTP when we bring the interface down to avoid getting
unmatched RX timestamp events, and tries to re-enable it when bringing
the interface up.

[bwh: Make efx_ptp_stop() safe on Falcon. Introduce
 efx_ptp_{start,stop}_datapath() functions; we'll expand them later.]

Fixes: 7c236c43b838 ('sfc: Add support for IEEE-1588 PTP')
Signed-off-by: Ben Hutchings <bhutchings@solarflare.com>
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