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S2io: fix statistics flush after a MTU change 

On s2io driver, when you change the interface MTU, it invokes a card
reset, which flush some statistics.  This patch solves this problem, and
also set the net_device->stats as the default statistics structure,
instead of s2io_nic->stats.

To do that, s2io_nic->stats turned into a staging area, where is saved
statistics of the last hardware statistics query. So, the difference
between the current hardware statistics and s2io_nic->stats, is the
value that should be summed up, in order to get the correct statistics
value, even after a reset.

Signed-off-by: Breno Leitao <leitao@linux.vnet.ibm.com>
Signed-off-by: Jay Vosburgh <fubar@us.ibm.com>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
This commit is contained in:
Breno Leitao 2008-07-22 16:27:20 -03:00 committed by Jeff Garzik
parent c7b7b04206
commit dc56e634c8
1 changed files with 23 additions and 6 deletions
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29
drivers/net/s2io.c
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@ -3143,7 +3143,7 @@ static void tx_intr_handler(struct fifo_info *fifo_data)
pkt_cnt++;
/* Updating the statistics block */
nic->stats.tx_bytes += skb->len;
nic->dev->stats.tx_bytes += skb->len;
nic->mac_control.stats_info->sw_stat.mem_freed += skb->truesize;
dev_kfree_skb_irq(skb);
@ -4896,25 +4896,42 @@ static struct net_device_stats *s2io_get_stats(struct net_device *dev)
/* Configure Stats for immediate updt */
s2io_updt_stats(sp);
/* Using sp->stats as a staging area, because reset (due to mtu
change, for example) will clear some hardware counters */
dev->stats.tx_packets +=
le32_to_cpu(mac_control->stats_info->tmac_frms) -
sp->stats.tx_packets;
sp->stats.tx_packets =
le32_to_cpu(mac_control->stats_info->tmac_frms);
dev->stats.tx_errors +=
le32_to_cpu(mac_control->stats_info->tmac_any_err_frms) -
sp->stats.tx_errors;
sp->stats.tx_errors =
le32_to_cpu(mac_control->stats_info->tmac_any_err_frms);
dev->stats.rx_errors +=
le64_to_cpu(mac_control->stats_info->rmac_drop_frms) -
sp->stats.rx_errors;
sp->stats.rx_errors =
le64_to_cpu(mac_control->stats_info->rmac_drop_frms);
dev->stats.multicast =
le32_to_cpu(mac_control->stats_info->rmac_vld_mcst_frms) -
sp->stats.multicast;
sp->stats.multicast =
le32_to_cpu(mac_control->stats_info->rmac_vld_mcst_frms);
dev->stats.rx_length_errors =
le64_to_cpu(mac_control->stats_info->rmac_long_frms) -
sp->stats.rx_length_errors;
sp->stats.rx_length_errors =
le64_to_cpu(mac_control->stats_info->rmac_long_frms);
/* collect per-ring rx_packets and rx_bytes */
sp->stats.rx_packets = sp->stats.rx_bytes = 0;
dev->stats.rx_packets = dev->stats.rx_bytes = 0;
for (i = 0; i < config->rx_ring_num; i++) {
sp->stats.rx_packets += mac_control->rings[i].rx_packets;
sp->stats.rx_bytes += mac_control->rings[i].rx_bytes;
dev->stats.rx_packets += mac_control->rings[i].rx_packets;
dev->stats.rx_bytes += mac_control->rings[i].rx_bytes;
}
return (&sp->stats);
return (&dev->stats);
}
/**
@ -7419,7 +7436,7 @@ static int rx_osm_handler(struct ring_info *ring_data, struct RxD_t * rxdp)
if (err_mask != 0x5) {
DBG_PRINT(ERR_DBG, "%s: Rx error Value: 0x%x\n",
dev->name, err_mask);
sp->stats.rx_crc_errors++;
dev->stats.rx_crc_errors++;
sp->mac_control.stats_info->sw_stat.mem_freed
+= skb->truesize;
dev_kfree_skb(skb);