net: fec: cache statistics while device is down

Execution 'ethtool -S' on fec device that is down causes OOPS on Vybrid
board:

Unhandled fault: external abort on non-linefetch (0x1008) at 0xe0898200
pgd = ddecc000
[e0898200] *pgd=9e406811, *pte=400d1653, *ppte=400d1453
Internal error: : 1008 [#1] SMP ARM
...

Reason of OOPS is that fec_enet_get_ethtool_stats() accesses fec
registers while IPG clock is stopped by PM.

Fix that by caching statistics in fec_enet_private. Cache is initialized
at device probe time, and updated at statistics request time if device
is up, and also just before turning device off on down path.

Additional locking is not needed, since cached statistics is accessed
either before device is registered, or under rtnl_lock().

Signed-off-by: Nikita Yushchenko <nikita.yoush@cogentembedded.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Nikita Yushchenko 2016-11-29 09:44:51 +03:00 committed by David S. Miller
parent 17b463654f
commit 80cca775cd
2 changed files with 21 additions and 4 deletions

View File

@ -574,6 +574,8 @@ struct fec_enet_private {
unsigned int reload_period;
int pps_enable;
unsigned int next_counter;
u64 ethtool_stats[0];
};
void fec_ptp_init(struct platform_device *pdev);

View File

@ -2313,14 +2313,24 @@ static const struct fec_stat {
{ "IEEE_rx_octets_ok", IEEE_R_OCTETS_OK },
};
static void fec_enet_get_ethtool_stats(struct net_device *dev,
struct ethtool_stats *stats, u64 *data)
static void fec_enet_update_ethtool_stats(struct net_device *dev)
{
struct fec_enet_private *fep = netdev_priv(dev);
int i;
for (i = 0; i < ARRAY_SIZE(fec_stats); i++)
data[i] = readl(fep->hwp + fec_stats[i].offset);
fep->ethtool_stats[i] = readl(fep->hwp + fec_stats[i].offset);
}
static void fec_enet_get_ethtool_stats(struct net_device *dev,
struct ethtool_stats *stats, u64 *data)
{
struct fec_enet_private *fep = netdev_priv(dev);
if (netif_running(dev))
fec_enet_update_ethtool_stats(dev);
memcpy(data, fep->ethtool_stats, ARRAY_SIZE(fec_stats) * sizeof(u64));
}
static void fec_enet_get_strings(struct net_device *netdev,
@ -2874,6 +2884,8 @@ fec_enet_close(struct net_device *ndev)
if (fep->quirks & FEC_QUIRK_ERR006687)
imx6q_cpuidle_fec_irqs_unused();
fec_enet_update_ethtool_stats(ndev);
fec_enet_clk_enable(ndev, false);
pinctrl_pm_select_sleep_state(&fep->pdev->dev);
pm_runtime_mark_last_busy(&fep->pdev->dev);
@ -3180,6 +3192,8 @@ static int fec_enet_init(struct net_device *ndev)
fec_restart(ndev);
fec_enet_update_ethtool_stats(ndev);
return 0;
}
@ -3278,7 +3292,8 @@ fec_probe(struct platform_device *pdev)
fec_enet_get_queue_num(pdev, &num_tx_qs, &num_rx_qs);
/* Init network device */
ndev = alloc_etherdev_mqs(sizeof(struct fec_enet_private),
ndev = alloc_etherdev_mqs(sizeof(struct fec_enet_private) +
ARRAY_SIZE(fec_stats) * sizeof(u64),
num_tx_qs, num_rx_qs);
if (!ndev)
return -ENOMEM;