diff options
Diffstat (limited to 'drivers/net')
| -rw-r--r-- | drivers/net/sfc/efx.c | 41 | ||||
| -rw-r--r-- | drivers/net/sfc/ethtool.c | 8 | ||||
| -rw-r--r-- | drivers/net/sfc/falcon.c | 11 | ||||
| -rw-r--r-- | drivers/net/sfc/net_driver.h | 2 |
4 files changed, 28 insertions, 34 deletions
diff --git a/drivers/net/sfc/efx.c b/drivers/net/sfc/efx.c index 862e4832f61..30951fb3d20 100644 --- a/drivers/net/sfc/efx.c +++ b/drivers/net/sfc/efx.c @@ -228,26 +228,20 @@ static int efx_poll(struct napi_struct *napi, int budget) if (channel->used_flags & EFX_USED_BY_RX && efx->irq_rx_adaptive && unlikely(++channel->irq_count == 1000)) { - unsigned old_irq_moderation = channel->irq_moderation; - if (unlikely(channel->irq_mod_score < irq_adapt_low_thresh)) { - channel->irq_moderation = - max_t(int, - channel->irq_moderation - - FALCON_IRQ_MOD_RESOLUTION, - FALCON_IRQ_MOD_RESOLUTION); + if (channel->irq_moderation > 1) { + channel->irq_moderation -= 1; + falcon_set_int_moderation(channel); + } } else if (unlikely(channel->irq_mod_score > irq_adapt_high_thresh)) { - channel->irq_moderation = - min(channel->irq_moderation + - FALCON_IRQ_MOD_RESOLUTION, - efx->irq_rx_moderation); + if (channel->irq_moderation < + efx->irq_rx_moderation) { + channel->irq_moderation += 1; + falcon_set_int_moderation(channel); + } } - - if (channel->irq_moderation != old_irq_moderation) - falcon_set_int_moderation(channel); - channel->irq_count = 0; channel->irq_mod_score = 0; } @@ -1220,22 +1214,33 @@ void efx_flush_queues(struct efx_nic *efx) * **************************************************************************/ +static unsigned irq_mod_ticks(int usecs, int resolution) +{ + if (usecs <= 0) + return 0; /* cannot receive interrupts ahead of time :-) */ + if (usecs < resolution) + return 1; /* never round down to 0 */ + return usecs / resolution; +} + /* Set interrupt moderation parameters */ void efx_init_irq_moderation(struct efx_nic *efx, int tx_usecs, int rx_usecs, bool rx_adaptive) { struct efx_tx_queue *tx_queue; struct efx_rx_queue *rx_queue; + unsigned tx_ticks = irq_mod_ticks(tx_usecs, FALCON_IRQ_MOD_RESOLUTION); + unsigned rx_ticks = irq_mod_ticks(rx_usecs, FALCON_IRQ_MOD_RESOLUTION); EFX_ASSERT_RESET_SERIALISED(efx); efx_for_each_tx_queue(tx_queue, efx) - tx_queue->channel->irq_moderation = tx_usecs; + tx_queue->channel->irq_moderation = tx_ticks; efx->irq_rx_adaptive = rx_adaptive; - efx->irq_rx_moderation = rx_usecs; + efx->irq_rx_moderation = rx_ticks; efx_for_each_rx_queue(rx_queue, efx) - rx_queue->channel->irq_moderation = rx_usecs; + rx_queue->channel->irq_moderation = rx_ticks; } /************************************************************************** diff --git a/drivers/net/sfc/ethtool.c b/drivers/net/sfc/ethtool.c index 45018f283ff..a313b61c8ff 100644 --- a/drivers/net/sfc/ethtool.c +++ b/drivers/net/sfc/ethtool.c @@ -618,6 +618,9 @@ static int efx_ethtool_get_coalesce(struct net_device *net_dev, coalesce->use_adaptive_rx_coalesce = efx->irq_rx_adaptive; coalesce->rx_coalesce_usecs_irq = efx->irq_rx_moderation; + coalesce->tx_coalesce_usecs_irq *= FALCON_IRQ_MOD_RESOLUTION; + coalesce->rx_coalesce_usecs_irq *= FALCON_IRQ_MOD_RESOLUTION; + return 0; } @@ -656,11 +659,6 @@ static int efx_ethtool_set_coalesce(struct net_device *net_dev, } efx_init_irq_moderation(efx, tx_usecs, rx_usecs, adaptive); - - /* Reset channel to pick up new moderation value. Note that - * this may change the value of the irq_moderation field - * (e.g. to allow for hardware timer granularity). - */ efx_for_each_channel(channel, efx) falcon_set_int_moderation(channel); diff --git a/drivers/net/sfc/falcon.c b/drivers/net/sfc/falcon.c index 1582df7aba7..e3c33fa06c8 100644 --- a/drivers/net/sfc/falcon.c +++ b/drivers/net/sfc/falcon.c @@ -1063,20 +1063,11 @@ void falcon_set_int_moderation(struct efx_channel *channel) /* Set timer register */ if (channel->irq_moderation) { - /* Round to resolution supported by hardware. The value we - * program is based at 0. So actual interrupt moderation - * achieved is ((x + 1) * res). - */ - channel->irq_moderation -= (channel->irq_moderation % - FALCON_IRQ_MOD_RESOLUTION); - if (channel->irq_moderation < FALCON_IRQ_MOD_RESOLUTION) - channel->irq_moderation = FALCON_IRQ_MOD_RESOLUTION; EFX_POPULATE_DWORD_2(timer_cmd, FRF_AB_TC_TIMER_MODE, FFE_BB_TIMER_MODE_INT_HLDOFF, FRF_AB_TC_TIMER_VAL, - channel->irq_moderation / - FALCON_IRQ_MOD_RESOLUTION - 1); + channel->irq_moderation - 1); } else { EFX_POPULATE_DWORD_2(timer_cmd, FRF_AB_TC_TIMER_MODE, diff --git a/drivers/net/sfc/net_driver.h b/drivers/net/sfc/net_driver.h index 25b793327c1..c8b6998d7fc 100644 --- a/drivers/net/sfc/net_driver.h +++ b/drivers/net/sfc/net_driver.h @@ -327,7 +327,7 @@ enum efx_rx_alloc_method { * @used_flags: Channel is used by net driver * @enabled: Channel enabled indicator * @irq: IRQ number (MSI and MSI-X only) - * @irq_moderation: IRQ moderation value (in us) + * @irq_moderation: IRQ moderation value (in hardware ticks) * @napi_dev: Net device used with NAPI * @napi_str: NAPI control structure * @reset_work: Scheduled reset work thread |