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authorBen Hutchings <bhutchings@solarflare.com>2011-02-07 23:04:38 +0000
committerBen Hutchings <bhutchings@solarflare.com>2011-02-15 19:45:34 +0000
commit525da9072c28df815bff64bf00f3b11ab88face8 (patch)
tree0649a1fff4d110796dd7f22168c9413cd8eb5caa /drivers/net/sfc
parent60031fcc17057e21566ed34ba23e93fffda1aa27 (diff)
sfc: Distinguish queue lookup from test for queue existence
efx_channel_get_{rx,tx}_queue() currently return NULL if the channel isn't used for traffic in that direction. In most cases this is a bug, but some callers rely on it as an existence test. Add existence test functions efx_channel_has_{rx_queue,tx_queues}() and use them as appropriate. Change efx_channel_get_{rx,tx}_queue() to assert that the requested queue exists. Remove now-redundant initialisation from efx_set_channels(). Signed-off-by: Ben Hutchings <bhutchings@solarflare.com>
Diffstat (limited to 'drivers/net/sfc')
-rw-r--r--drivers/net/sfc/efx.c17
-rw-r--r--drivers/net/sfc/ethtool.c6
-rw-r--r--drivers/net/sfc/net_driver.h39
3 files changed, 33 insertions, 29 deletions
diff --git a/drivers/net/sfc/efx.c b/drivers/net/sfc/efx.c
index c559bc372fc..6189d306601 100644
--- a/drivers/net/sfc/efx.c
+++ b/drivers/net/sfc/efx.c
@@ -1271,21 +1271,8 @@ static void efx_remove_interrupts(struct efx_nic *efx)
static void efx_set_channels(struct efx_nic *efx)
{
- struct efx_channel *channel;
- struct efx_tx_queue *tx_queue;
-
efx->tx_channel_offset =
separate_tx_channels ? efx->n_channels - efx->n_tx_channels : 0;
-
- /* Channel pointers were set in efx_init_struct() but we now
- * need to clear them for TX queues in any RX-only channels. */
- efx_for_each_channel(channel, efx) {
- if (channel->channel - efx->tx_channel_offset >=
- efx->n_tx_channels) {
- efx_for_each_channel_tx_queue(tx_queue, channel)
- tx_queue->channel = NULL;
- }
- }
}
static int efx_probe_nic(struct efx_nic *efx)
@@ -1531,9 +1518,9 @@ void efx_init_irq_moderation(struct efx_nic *efx, int tx_usecs, int rx_usecs,
efx->irq_rx_adaptive = rx_adaptive;
efx->irq_rx_moderation = rx_ticks;
efx_for_each_channel(channel, efx) {
- if (efx_channel_get_rx_queue(channel))
+ if (efx_channel_has_rx_queue(channel))
channel->irq_moderation = rx_ticks;
- else if (efx_channel_get_tx_queue(channel, 0))
+ else if (efx_channel_has_tx_queues(channel))
channel->irq_moderation = tx_ticks;
}
}
diff --git a/drivers/net/sfc/ethtool.c b/drivers/net/sfc/ethtool.c
index 713969accdb..272cfe724e1 100644
--- a/drivers/net/sfc/ethtool.c
+++ b/drivers/net/sfc/ethtool.c
@@ -631,7 +631,7 @@ static int efx_ethtool_get_coalesce(struct net_device *net_dev,
/* Find lowest IRQ moderation across all used TX queues */
coalesce->tx_coalesce_usecs_irq = ~((u32) 0);
efx_for_each_channel(channel, efx) {
- if (!efx_channel_get_tx_queue(channel, 0))
+ if (!efx_channel_has_tx_queues(channel))
continue;
if (channel->irq_moderation < coalesce->tx_coalesce_usecs_irq) {
if (channel->channel < efx->n_rx_channels)
@@ -676,8 +676,8 @@ static int efx_ethtool_set_coalesce(struct net_device *net_dev,
/* If the channel is shared only allow RX parameters to be set */
efx_for_each_channel(channel, efx) {
- if (efx_channel_get_rx_queue(channel) &&
- efx_channel_get_tx_queue(channel, 0) &&
+ if (efx_channel_has_rx_queue(channel) &&
+ efx_channel_has_tx_queues(channel) &&
tx_usecs) {
netif_err(efx, drv, efx->net_dev, "Channel is shared. "
"Only RX coalescing may be set\n");
diff --git a/drivers/net/sfc/net_driver.h b/drivers/net/sfc/net_driver.h
index c65270241d2..77b7ce45151 100644
--- a/drivers/net/sfc/net_driver.h
+++ b/drivers/net/sfc/net_driver.h
@@ -938,19 +938,28 @@ efx_get_tx_queue(struct efx_nic *efx, unsigned index, unsigned type)
return &efx->channel[efx->tx_channel_offset + index]->tx_queue[type];
}
+static inline bool efx_channel_has_tx_queues(struct efx_channel *channel)
+{
+ return channel->channel - channel->efx->tx_channel_offset <
+ channel->efx->n_tx_channels;
+}
+
static inline struct efx_tx_queue *
efx_channel_get_tx_queue(struct efx_channel *channel, unsigned type)
{
- struct efx_tx_queue *tx_queue = channel->tx_queue;
- EFX_BUG_ON_PARANOID(type >= EFX_TXQ_TYPES);
- return tx_queue->channel ? tx_queue + type : NULL;
+ EFX_BUG_ON_PARANOID(!efx_channel_has_tx_queues(channel) ||
+ type >= EFX_TXQ_TYPES);
+ return &channel->tx_queue[type];
}
/* Iterate over all TX queues belonging to a channel */
#define efx_for_each_channel_tx_queue(_tx_queue, _channel) \
- for (_tx_queue = efx_channel_get_tx_queue(channel, 0); \
- _tx_queue && _tx_queue < (_channel)->tx_queue + EFX_TXQ_TYPES; \
- _tx_queue++)
+ if (!efx_channel_has_tx_queues(_channel)) \
+ ; \
+ else \
+ for (_tx_queue = (_channel)->tx_queue; \
+ _tx_queue < (_channel)->tx_queue + EFX_TXQ_TYPES; \
+ _tx_queue++)
static inline struct efx_rx_queue *
efx_get_rx_queue(struct efx_nic *efx, unsigned index)
@@ -959,18 +968,26 @@ efx_get_rx_queue(struct efx_nic *efx, unsigned index)
return &efx->channel[index]->rx_queue;
}
+static inline bool efx_channel_has_rx_queue(struct efx_channel *channel)
+{
+ return channel->channel < channel->efx->n_rx_channels;
+}
+
static inline struct efx_rx_queue *
efx_channel_get_rx_queue(struct efx_channel *channel)
{
- return channel->channel < channel->efx->n_rx_channels ?
- &channel->rx_queue : NULL;
+ EFX_BUG_ON_PARANOID(!efx_channel_has_rx_queue(channel));
+ return &channel->rx_queue;
}
/* Iterate over all RX queues belonging to a channel */
#define efx_for_each_channel_rx_queue(_rx_queue, _channel) \
- for (_rx_queue = efx_channel_get_rx_queue(channel); \
- _rx_queue; \
- _rx_queue = NULL)
+ if (!efx_channel_has_rx_queue(_channel)) \
+ ; \
+ else \
+ for (_rx_queue = &(_channel)->rx_queue; \
+ _rx_queue; \
+ _rx_queue = NULL)
static inline struct efx_channel *
efx_rx_queue_channel(struct efx_rx_queue *rx_queue)