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net/sfc: request MAC stats upload immediately on port start

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If MAC stats refresh is arranged to be done by periodic DMA,
the first DMA transaction is unlikely to occur right on the
port start; if the user tries to get stats right after port
start and before the transaction occurs, bogus figures will
be collected; a one-off stats upload on port start is a fix

Fixes: 1caab2f1e6 ("net/sfc: add basic statistics")
Cc: stable@dpdk.org

Signed-off-by: Ivan Malov <ivan.malov@oktetlabs.ru>
Signed-off-by: Andrew Rybchenko <arybchenko@solarflare.com>
This commit is contained in:
Ivan Malov 2017-07-08 16:16:55 +01:00 committed by Ferruh Yigit
parent 1a35dc877a
commit 3b257f7e6c
1 changed files with 13 additions and 0 deletions
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13
drivers/net/sfc/sfc_port.c
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@ -245,6 +245,18 @@ sfc_port_start(struct sfc_adapter *sa)
}
}
if ((port->mac_stats_update_period_ms != 0) &&
port->mac_stats_periodic_dma_supported) {
/*
* Request an explicit MAC stats upload immediately to
* preclude bogus figures readback if the user decides
* to read stats before periodic DMA is really started
*/
rc = efx_mac_stats_upload(sa->nic, &port->mac_stats_dma_mem);
if (rc != 0)
goto fail_mac_stats_upload;
}
sfc_log_init(sa, "disable MAC drain");
rc = efx_mac_drain(sa->nic, B_FALSE);
if (rc != 0)
@ -265,6 +277,7 @@ sfc_port_start(struct sfc_adapter *sa)
(void)efx_mac_stats_periodic(sa->nic, &port->mac_stats_dma_mem,
0, B_FALSE);
fail_mac_stats_upload:
fail_mac_stats_periodic:
fail_mcast_address_list_set:
fail_mac_filter_set: