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Date: Mon, 05 Sep 2011 18:43:04 +0100
From: Ben Hutchings <bhutchings@...arflare.com>
To: David Miller <davem@...emloft.net>
Cc: netdev@...r.kernel.org, linux-net-drivers@...arflare.com,
Ripduman Sohan <ripduman.sohan@...cam.ac.uk>
Subject: [PATCH net-next 4/5] 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 <bhutchings@...arflare.com>
---
drivers/net/ethernet/sfc/efx.c | 20 +++++++++++++++++---
drivers/net/ethernet/sfc/efx.h | 5 +++--
drivers/net/ethernet/sfc/ethtool.c | 17 ++++++++---------
drivers/net/ethernet/sfc/falcon.c | 2 ++
drivers/net/ethernet/sfc/nic.h | 3 ++-
drivers/net/ethernet/sfc/siena.c | 2 ++
6 files changed, 34 insertions(+), 15 deletions(-)
diff --git a/drivers/net/ethernet/sfc/efx.c b/drivers/net/ethernet/sfc/efx.c
index e0157c0..76dcadf 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 8ca6863..442f4d0 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 1cb6ed0..98b363b 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 94bf4aa..4dd1748 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 4bd1f28..b5b2886 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 5735e84..4fdd148 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,
--
1.7.4.4
--
Ben Hutchings, Staff Engineer, Solarflare
Not speaking for my employer; that's the marketing department's job.
They asked us to note that Solarflare product names are trademarked.
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