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sfc: Fix interface statistics running backward

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Some interface statistics are computed in such a way that they can
sometimes decrease (and even underflow).  Since the computed value
will never be greater than the true value, we fix this by only storing
the computed value when it increases.

Signed-off-by: Ben Hutchings <bhutchings@solarflare.com>
This commit is contained in:
Ben Hutchings 2012-07-04 22:25:07 +01:00
parent d4f2cecce1
commit b7f514af7d
3 changed files with 28 additions and 10 deletions
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12
drivers/net/ethernet/sfc/falcon_xmac.c
View file

@ -341,12 +341,12 @@ void falcon_update_stats_xmac(struct efx_nic *efx)
FALCON_STAT(efx, XgTxIpSrcErrPkt, tx_ip_src_error);
/* Update derived statistics */
mac_stats->tx_good_bytes =
(mac_stats->tx_bytes - mac_stats->tx_bad_bytes -
mac_stats->tx_control * 64);
mac_stats->rx_bad_bytes =
(mac_stats->rx_bytes - mac_stats->rx_good_bytes -
mac_stats->rx_control * 64);
efx_update_diff_stat(&mac_stats->tx_good_bytes,
mac_stats->tx_bytes - mac_stats->tx_bad_bytes -
mac_stats->tx_control * 64);
efx_update_diff_stat(&mac_stats->rx_bad_bytes,
mac_stats->rx_bytes - mac_stats->rx_good_bytes -
mac_stats->rx_control * 64);
}
void falcon_poll_xmac(struct efx_nic *efx)

18
drivers/net/ethernet/sfc/nic.h
View file

@ -294,6 +294,24 @@ extern bool falcon_xmac_check_fault(struct efx_nic *efx);
extern int falcon_reconfigure_xmac(struct efx_nic *efx);
extern void falcon_update_stats_xmac(struct efx_nic *efx);
/* Some statistics are computed as A - B where A and B each increase
* linearly with some hardware counter(s) and the counters are read
* asynchronously. If the counters contributing to B are always read
* after those contributing to A, the computed value may be lower than
* the true value by some variable amount, and may decrease between
* subsequent computations.
*
* We should never allow statistics to decrease or to exceed the true
* value. Since the computed value will never be greater than the
* true value, we can achieve this by only storing the computed value
* when it increases.
*/
static inline void efx_update_diff_stat(u64 *stat, u64 diff)
{
if ((s64)(diff - *stat) > 0)
*stat = diff;
}
/* Interrupts and test events */
extern int efx_nic_init_interrupt(struct efx_nic *efx);
extern void efx_nic_enable_interrupts(struct efx_nic *efx);

8
drivers/net/ethernet/sfc/siena.c
View file

@ -458,8 +458,8 @@ static int siena_try_update_nic_stats(struct efx_nic *efx)
MAC_STAT(tx_bytes, TX_BYTES);
MAC_STAT(tx_bad_bytes, TX_BAD_BYTES);
mac_stats->tx_good_bytes = (mac_stats->tx_bytes -
mac_stats->tx_bad_bytes);
efx_update_diff_stat(&mac_stats->tx_good_bytes,
mac_stats->tx_bytes - mac_stats->tx_bad_bytes);
MAC_STAT(tx_packets, TX_PKTS);
MAC_STAT(tx_bad, TX_BAD_FCS_PKTS);
MAC_STAT(tx_pause, TX_PAUSE_PKTS);
@ -492,8 +492,8 @@ static int siena_try_update_nic_stats(struct efx_nic *efx)
MAC_STAT(tx_ip_src_error, TX_IP_SRC_ERR_PKTS);
MAC_STAT(rx_bytes, RX_BYTES);
MAC_STAT(rx_bad_bytes, RX_BAD_BYTES);
mac_stats->rx_good_bytes = (mac_stats->rx_bytes -
mac_stats->rx_bad_bytes);
efx_update_diff_stat(&mac_stats->rx_good_bytes,
mac_stats->rx_bytes - mac_stats->rx_bad_bytes);
MAC_STAT(rx_packets, RX_PKTS);
MAC_STAT(rx_good, RX_GOOD_PKTS);
MAC_STAT(rx_bad, RX_BAD_FCS_PKTS);