From: Ben Hutchings Date: Mon, 5 Sep 2011 07:43:04 +0000 (+0000) Subject: sfc: Validate IRQ moderation parameters in efx_init_irq_moderation() X-Git-Tag: v3.2-rc1~129^2~282 X-Git-Url: https://git.openpandora.org/cgi-bin/gitweb.cgi?p=pandora-kernel.git;a=commitdiff_plain;h=9e393b3060ec4ed7e7c7c5de154e08e48c98f623;hp=a0c4faf5484b1fe38952d5b975f19e9f4b8f0f2b sfc: Validate IRQ moderation parameters in efx_init_irq_moderation() Add a range check, and move the check that RX and TX are consistent from efx_ethtool_set_coalesce(). Signed-off-by: Ben Hutchings Signed-off-by: David S. Miller --- diff --git a/drivers/net/ethernet/sfc/efx.c b/drivers/net/ethernet/sfc/efx.c index e0157c03d313..76dcadfaaa43 100644 --- a/drivers/net/ethernet/sfc/efx.c +++ b/drivers/net/ethernet/sfc/efx.c @@ -1357,7 +1357,8 @@ static int efx_probe_nic(struct efx_nic *efx) netif_set_real_num_rx_queues(efx->net_dev, efx->n_rx_channels); /* Initialise the interrupt moderation settings */ - efx_init_irq_moderation(efx, tx_irq_mod_usec, rx_irq_mod_usec, true); + efx_init_irq_moderation(efx, tx_irq_mod_usec, rx_irq_mod_usec, true, + true); return 0; @@ -1566,8 +1567,9 @@ static unsigned int irq_mod_ticks(unsigned int usecs, unsigned int resolution) } /* Set interrupt moderation parameters */ -void efx_init_irq_moderation(struct efx_nic *efx, unsigned int tx_usecs, - unsigned int rx_usecs, bool rx_adaptive) +int efx_init_irq_moderation(struct efx_nic *efx, unsigned int tx_usecs, + unsigned int rx_usecs, bool rx_adaptive, + bool rx_may_override_tx) { struct efx_channel *channel; unsigned tx_ticks = irq_mod_ticks(tx_usecs, EFX_IRQ_MOD_RESOLUTION); @@ -1575,6 +1577,16 @@ void efx_init_irq_moderation(struct efx_nic *efx, unsigned int tx_usecs, EFX_ASSERT_RESET_SERIALISED(efx); + if (tx_ticks > EFX_IRQ_MOD_MAX || rx_ticks > EFX_IRQ_MOD_MAX) + return -EINVAL; + + if (tx_ticks != rx_ticks && efx->tx_channel_offset == 0 && + !rx_may_override_tx) { + netif_err(efx, drv, efx->net_dev, "Channels are shared. " + "RX and TX IRQ moderation must be equal\n"); + return -EINVAL; + } + efx->irq_rx_adaptive = rx_adaptive; efx->irq_rx_moderation = rx_ticks; efx_for_each_channel(channel, efx) { @@ -1583,6 +1595,8 @@ void efx_init_irq_moderation(struct efx_nic *efx, unsigned int tx_usecs, else if (efx_channel_has_tx_queues(channel)) channel->irq_moderation = tx_ticks; } + + return 0; } void efx_get_irq_moderation(struct efx_nic *efx, unsigned int *tx_usecs, diff --git a/drivers/net/ethernet/sfc/efx.h b/drivers/net/ethernet/sfc/efx.h index 8ca68631fce5..442f4d0c247d 100644 --- a/drivers/net/ethernet/sfc/efx.h +++ b/drivers/net/ethernet/sfc/efx.h @@ -111,8 +111,9 @@ extern int efx_reset_up(struct efx_nic *efx, enum reset_type method, bool ok); /* Global */ extern void efx_schedule_reset(struct efx_nic *efx, enum reset_type type); -extern void efx_init_irq_moderation(struct efx_nic *efx, unsigned int tx_usecs, - unsigned int rx_usecs, bool rx_adaptive); +extern int efx_init_irq_moderation(struct efx_nic *efx, unsigned int tx_usecs, + unsigned int rx_usecs, bool rx_adaptive, + bool rx_may_override_tx); extern void efx_get_irq_moderation(struct efx_nic *efx, unsigned int *tx_usecs, unsigned int *rx_usecs, bool *rx_adaptive); diff --git a/drivers/net/ethernet/sfc/ethtool.c b/drivers/net/ethernet/sfc/ethtool.c index 1cb6ed0a255c..98b363bb4a75 100644 --- a/drivers/net/ethernet/sfc/ethtool.c +++ b/drivers/net/ethernet/sfc/ethtool.c @@ -623,7 +623,8 @@ static int efx_ethtool_set_coalesce(struct net_device *net_dev, struct efx_nic *efx = netdev_priv(net_dev); struct efx_channel *channel; unsigned int tx_usecs, rx_usecs; - bool adaptive; + bool adaptive, rx_may_override_tx; + int rc; if (coalesce->use_adaptive_tx_coalesce) return -EINVAL; @@ -642,16 +643,14 @@ static int efx_ethtool_set_coalesce(struct net_device *net_dev, /* If channels are shared, TX IRQ moderation can be quietly * overridden unless it is changed from its old value. */ - if (efx->tx_channel_offset == 0 && - coalesce->tx_coalesce_usecs_irq != tx_usecs && - coalesce->tx_coalesce_usecs_irq != rx_usecs) { - netif_err(efx, drv, efx->net_dev, "Channels are shared. " - "RX and TX IRQ moderation must be equal\n"); - return -EINVAL; - } + rx_may_override_tx = coalesce->tx_coalesce_usecs_irq == tx_usecs; tx_usecs = coalesce->tx_coalesce_usecs_irq; - efx_init_irq_moderation(efx, tx_usecs, rx_usecs, adaptive); + rc = efx_init_irq_moderation(efx, tx_usecs, rx_usecs, adaptive, + rx_may_override_tx); + if (rc != 0) + return rc; + efx_for_each_channel(channel, efx) efx->type->push_irq_moderation(channel); diff --git a/drivers/net/ethernet/sfc/falcon.c b/drivers/net/ethernet/sfc/falcon.c index 94bf4aaf984d..4dd1748a19c6 100644 --- a/drivers/net/ethernet/sfc/falcon.c +++ b/drivers/net/ethernet/sfc/falcon.c @@ -104,6 +104,8 @@ static void falcon_push_irq_moderation(struct efx_channel *channel) efx_dword_t timer_cmd; struct efx_nic *efx = channel->efx; + BUILD_BUG_ON(EFX_IRQ_MOD_MAX > (1 << FRF_AB_TC_TIMER_VAL_WIDTH)); + /* Set timer register */ if (channel->irq_moderation) { EFX_POPULATE_DWORD_2(timer_cmd, diff --git a/drivers/net/ethernet/sfc/nic.h b/drivers/net/ethernet/sfc/nic.h index 4bd1f2839dfe..b5b288628c6b 100644 --- a/drivers/net/ethernet/sfc/nic.h +++ b/drivers/net/ethernet/sfc/nic.h @@ -204,7 +204,8 @@ extern irqreturn_t efx_nic_fatal_interrupt(struct efx_nic *efx); extern irqreturn_t falcon_legacy_interrupt_a1(int irq, void *dev_id); extern void falcon_irq_ack_a1(struct efx_nic *efx); -#define EFX_IRQ_MOD_RESOLUTION 5 +#define EFX_IRQ_MOD_RESOLUTION 5 +#define EFX_IRQ_MOD_MAX 0x1000 /* Global Resources */ extern int efx_nic_flush_queues(struct efx_nic *efx); diff --git a/drivers/net/ethernet/sfc/siena.c b/drivers/net/ethernet/sfc/siena.c index 5735e84c69de..4fdd148747b2 100644 --- a/drivers/net/ethernet/sfc/siena.c +++ b/drivers/net/ethernet/sfc/siena.c @@ -36,6 +36,8 @@ static void siena_push_irq_moderation(struct efx_channel *channel) { efx_dword_t timer_cmd; + BUILD_BUG_ON(EFX_IRQ_MOD_MAX > (1 << FRF_CZ_TC_TIMER_VAL_WIDTH)); + if (channel->irq_moderation) EFX_POPULATE_DWORD_2(timer_cmd, FRF_CZ_TC_TIMER_MODE,