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 (file)
--- a/drivers/net/ethernet/sfc/efx.c
+++ b/drivers/net/ethernet/sfc/efx.c
@@ -255,23 +255,6 @@ static int efx_process_channel(struct efx_channel *channel, int budget)
        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 @@ static int efx_poll(struct napi_struct *napi, int budget)
 
                /* 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 @@ static void efx_start_eventq(struct efx_channel *channel)
        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();
 

diff --git a/drivers/net/ethernet/sfc/efx.h b/drivers/net/ethernet/sfc/efx.h
index bdb30bb..09e633a 100644 (file)
--- a/drivers/net/ethernet/sfc/efx.h
+++ b/drivers/net/ethernet/sfc/efx.h
@@ -109,7 +109,6 @@ static inline void efx_filter_rfs_expire(struct efx_channel *channel) {}
 /* Channels */
 extern int efx_channel_dummy_op_int(struct efx_channel *channel);
 extern void efx_channel_dummy_op_void(struct efx_channel *channel);
-extern void efx_process_channel_now(struct efx_channel *channel);
 extern int
 efx_realloc_channels(struct efx_nic *efx, u32 rxq_entries, u32 txq_entries);
 
@@ -155,7 +154,6 @@ static inline void efx_schedule_channel(struct efx_channel *channel)
        netif_vdbg(channel->efx, intr, channel->efx->net_dev,
                   "channel %d scheduling NAPI poll on CPU%d\n",
                   channel->channel, raw_smp_processor_id());
-       channel->work_pending = true;
 
        napi_schedule(&channel->napi_str);
 }

diff --git a/drivers/net/ethernet/sfc/net_driver.h b/drivers/net/ethernet/sfc/net_driver.h
index ea64cd8..ad89d7d 100644 (file)
--- a/drivers/net/ethernet/sfc/net_driver.h
+++ b/drivers/net/ethernet/sfc/net_driver.h
@@ -361,7 +361,6 @@ enum efx_rx_alloc_method {
  * @irq_moderation: IRQ moderation value (in hardware ticks)
  * @napi_dev: Net device used with NAPI
  * @napi_str: NAPI control structure
- * @work_pending: Is work pending via NAPI?
  * @eventq: Event queue buffer
  * @eventq_mask: Event queue pointer mask
  * @eventq_read_ptr: Event queue read pointer
@@ -393,7 +392,6 @@ struct efx_channel {
        unsigned int irq_moderation;
        struct net_device *napi_dev;
        struct napi_struct napi_str;
-       bool work_pending;
        struct efx_special_buffer eventq;
        unsigned int eventq_mask;
        unsigned int eventq_read_ptr;

diff --git a/drivers/net/ethernet/sfc/selftest.c b/drivers/net/ethernet/sfc/selftest.c
index 2069f51..716cff9 100644 (file)
--- a/drivers/net/ethernet/sfc/selftest.c
+++ b/drivers/net/ethernet/sfc/selftest.c
@@ -447,14 +447,7 @@ static int efx_begin_loopback(struct efx_tx_queue *tx_queue)
 static int efx_poll_loopback(struct efx_nic *efx)
 {
        struct efx_loopback_state *state = efx->loopback_selftest;
-       struct efx_channel *channel;
 
-       /* NAPI polling is not enabled, so process channels
-        * synchronously */
-       efx_for_each_channel(channel, efx) {
-               if (channel->work_pending)
-                       efx_process_channel_now(channel);
-       }
        return atomic_read(&state->rx_good) == state->packet_count;
 }
 
@@ -586,10 +579,6 @@ static int efx_wait_for_link(struct efx_nic *efx)
                        mutex_lock(&efx->mac_lock);
                        efx->type->monitor(efx);
                        mutex_unlock(&efx->mac_lock);
-               } else {
-                       struct efx_channel *channel = efx_get_channel(efx, 0);
-                       if (channel->work_pending)
-                               efx_process_channel_now(channel);
                }
 
                mutex_lock(&efx->mac_lock);