netdev - [PATCH net-next 09/13] sfc: Reset driver's MAC stats after MC reboot seen

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Message-ID: <1354336993.2640.48.camel@bwh-desktop.uk.solarflarecom.com>
Date:	Sat, 1 Dec 2012 04:43:13 +0000
From:	Ben Hutchings <bhutchings@...arflare.com>
To:	David Miller <davem@...emloft.net>
CC:	<netdev@...r.kernel.org>, <linux-net-drivers@...arflare.com>
Subject: [PATCH net-next 09/13] sfc: Reset driver's MAC stats after MC
 reboot seen

If the MC reboots then the stats it reports to us will have been
reset.  We need to reset ours to get efx_update_diff_stat() working
properly.

(Ideally we would maintain stats across the reboot, but as this should
only happen immediately after a firmware upgrade it's not really worth
the trouble.)

Signed-off-by: Ben Hutchings <bhutchings@...arflare.com>
---
 drivers/net/ethernet/sfc/mcdi.c |    9 ++++++++-
 1 files changed, 8 insertions(+), 1 deletions(-)

diff --git a/drivers/net/ethernet/sfc/mcdi.c b/drivers/net/ethernet/sfc/mcdi.c
index e1967fb..3ef71a0 100644
--- a/drivers/net/ethernet/sfc/mcdi.c
+++ b/drivers/net/ethernet/sfc/mcdi.c
@@ -207,7 +207,9 @@ out:
 	return 0;
 }
 
-/* Test and clear MC-rebooted flag for this port/function */
+/* Test and clear MC-rebooted flag for this port/function; reset
+ * software state as necessary.
+ */
 int efx_mcdi_poll_reboot(struct efx_nic *efx)
 {
 	unsigned int addr = FR_CZ_MC_TREG_SMEM + MCDI_STATUS(efx);
@@ -223,6 +225,11 @@ int efx_mcdi_poll_reboot(struct efx_nic *efx)
 	if (value == 0)
 		return 0;
 
+	/* MAC statistics have been cleared on the NIC; clear our copy
+	 * so that efx_update_diff_stat() can continue to work.
+	 */
+	memset(&efx->mac_stats, 0, sizeof(efx->mac_stats));
+
 	EFX_ZERO_DWORD(reg);
 	efx_writed(efx, &reg, addr);
 
-- 
1.7.7.6



-- 
Ben Hutchings, Staff Engineer, Solarflare
Not speaking for my employer; that's the marketing department's job.
They asked us to note that Solarflare product names are trademarked.

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