sfc: Remove efx_process_channel_now()
efx_process_channel_now() is unneeded since self-tests can rely on
normal NAPI polling. Remove it and all calls to it.
efx_channel::work_pending and efx_channel_processed() are also
unneeded (the latter being the same as efx_nic_eventq_read_ack()).
Signed-off-by: Ben Hutchings <bhutchings@solarflare.com>
diff --git a/drivers/net/ethernet/sfc/efx.c b/drivers/net/ethernet/sfc/efx.c
index c729688..2b2dba1 100644
--- a/drivers/net/ethernet/sfc/efx.c
+++ b/drivers/net/ethernet/sfc/efx.c
@@ -255,23 +255,6 @@
return spent;
}
-/* Mark channel as finished processing
- *
- * Note that since we will not receive further interrupts for this
- * channel before we finish processing and call the eventq_read_ack()
- * method, there is no need to use the interrupt hold-off timers.
- */
-static inline void efx_channel_processed(struct efx_channel *channel)
-{
- /* The interrupt handler for this channel may set work_pending
- * as soon as we acknowledge the events we've seen. Make sure
- * it's cleared before then. */
- channel->work_pending = false;
- smp_wmb();
-
- efx_nic_eventq_read_ack(channel);
-}
-
/* NAPI poll handler
*
* NAPI guarantees serialisation of polls of the same device, which
@@ -316,58 +299,16 @@
/* There is no race here; although napi_disable() will
* only wait for napi_complete(), this isn't a problem
- * since efx_channel_processed() will have no effect if
+ * since efx_nic_eventq_read_ack() will have no effect if
* interrupts have already been disabled.
*/
napi_complete(napi);
- efx_channel_processed(channel);
+ efx_nic_eventq_read_ack(channel);
}
return spent;
}
-/* Process the eventq of the specified channel immediately on this CPU
- *
- * Disable hardware generated interrupts, wait for any existing
- * processing to finish, then directly poll (and ack ) the eventq.
- * Finally reenable NAPI and interrupts.
- *
- * This is for use only during a loopback self-test. It must not
- * deliver any packets up the stack as this can result in deadlock.
- */
-void efx_process_channel_now(struct efx_channel *channel)
-{
- struct efx_nic *efx = channel->efx;
-
- BUG_ON(channel->channel >= efx->n_channels);
- BUG_ON(!channel->enabled);
- BUG_ON(!efx->loopback_selftest);
-
- /* Disable interrupts and wait for ISRs to complete */
- efx_nic_disable_interrupts(efx);
- if (efx->legacy_irq) {
- synchronize_irq(efx->legacy_irq);
- efx->legacy_irq_enabled = false;
- }
- if (channel->irq)
- synchronize_irq(channel->irq);
-
- /* Wait for any NAPI processing to complete */
- napi_disable(&channel->napi_str);
-
- /* Poll the channel */
- efx_process_channel(channel, channel->eventq_mask + 1);
-
- /* Ack the eventq. This may cause an interrupt to be generated
- * when they are reenabled */
- efx_channel_processed(channel);
-
- napi_enable(&channel->napi_str);
- if (efx->legacy_irq)
- efx->legacy_irq_enabled = true;
- efx_nic_enable_interrupts(efx);
-}
-
/* Create event queue
* Event queue memory allocations are done only once. If the channel
* is reset, the memory buffer will be reused; this guards against
@@ -407,11 +348,7 @@
netif_dbg(channel->efx, ifup, channel->efx->net_dev,
"chan %d start event queue\n", channel->channel);
- /* The interrupt handler for this channel may set work_pending
- * as soon as we enable it. Make sure it's cleared before
- * then. Similarly, make sure it sees the enabled flag set.
- */
- channel->work_pending = false;
+ /* Make sure the NAPI handler sees the enabled flag set */
channel->enabled = true;
smp_wmb();