net: aquantia: Update hw counters on hw init

On very first start we should read out current HW counter values
to make diff based calculations later.
This also should be done each time NIC gets down/up or wakes up
after sleep state. We reset link state explicitly to prevent diffs
from being summed this first time.
Signed-off-by: Igor Russkikh <igor.russkikh@aquantia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/aquantia/atlantic/hw_atl/hw_atl_a0.c

@@ -344,6 +344,10 @@ static int hw_atl_a0_hw_init(struct aq_hw_s *self,
 	hw_atl_a0_hw_rss_set(self, &aq_nic_cfg->aq_rss);
 	hw_atl_a0_hw_rss_hash_set(self, &aq_nic_cfg->aq_rss);
 
+	/* Reset link status and read out initial hardware counters */
+	self->aq_link_status.mbps = 0;
+	hw_atl_utils_update_stats(self);
+
 	err = aq_hw_err_from_flags(self);
 	if (err < 0)
 		goto err_exit;

drivers/net/ethernet/aquantia/atlantic/hw_atl/hw_atl_b0.c

@@ -397,6 +397,10 @@ static int hw_atl_b0_hw_init(struct aq_hw_s *self,
 	 */
 	aq_hw_write_reg(self, tx_dma_total_req_limit_adr, 24);
 
+	/* Reset link status and read out initial hardware counters */
+	self->aq_link_status.mbps = 0;
+	hw_atl_utils_update_stats(self);
+
 	err = aq_hw_err_from_flags(self);
 	if (err < 0)
 		goto err_exit;