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>
diff --git a/drivers/net/sfc/net_driver.h b/drivers/net/sfc/net_driver.h
index c652702..77b7ce4 100644
--- a/drivers/net/sfc/net_driver.h
+++ b/drivers/net/sfc/net_driver.h
@@ -938,19 +938,28 @@
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 @@
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)