sfc: Encapsulate access to efx_{channel,nic}::last_irq_cpu in self-test

Cleanup in preparation for doing an event test on ifup.

Signed-off-by: Ben Hutchings <bhutchings@solarflare.com>

3 files changed, 21 insertions, 14 deletions

diff --git a/drivers/net/ethernet/sfc/nic.c b/drivers/net/ethernet/sfc/nic.c
index 5da8af5e7501..4c47b7569145 100644
--- a/drivers/net/ethernet/sfc/nic.c
+++ b/drivers/net/ethernet/sfc/nic.c
@@ -1332,8 +1332,10 @@ void efx_nic_remove_eventq(struct efx_channel *channel)
 }
 
 
-void efx_nic_generate_test_event(struct efx_channel *channel)
+void efx_nic_event_test_start(struct efx_channel *channel)
 {
+        channel->last_irq_cpu = -1;
+        smp_wmb();
         efx_magic_event(channel, EFX_CHANNEL_MAGIC_TEST(channel));
 }
 
@@ -1382,8 +1384,10 @@ void efx_nic_disable_interrupts(struct efx_nic *efx)
  * Interrupt must already have been enabled, otherwise nasty things
  * may happen.
  */
-void efx_nic_generate_interrupt(struct efx_nic *efx)
+void efx_nic_irq_test_start(struct efx_nic *efx)
 {
+        efx->last_irq_cpu = -1;
+        smp_wmb();
         efx_nic_interrupts(efx, true, true);
 }
 
diff --git a/drivers/net/ethernet/sfc/nic.h b/drivers/net/ethernet/sfc/nic.h
index ac12f7f7f35b..e0e8596f4d10 100644
--- a/drivers/net/ethernet/sfc/nic.h
+++ b/drivers/net/ethernet/sfc/nic.h
@@ -301,14 +301,23 @@ extern void falcon_update_stats_xmac(struct efx_nic *efx);
 /* Interrupts and test events */
 extern int efx_nic_init_interrupt(struct efx_nic *efx);
 extern void efx_nic_enable_interrupts(struct efx_nic *efx);
-extern void efx_nic_generate_test_event(struct efx_channel *channel);
-extern void efx_nic_generate_interrupt(struct efx_nic *efx);
+extern void efx_nic_event_test_start(struct efx_channel *channel);
+extern void efx_nic_irq_test_start(struct efx_nic *efx);
 extern void efx_nic_disable_interrupts(struct efx_nic *efx);
 extern void efx_nic_fini_interrupt(struct efx_nic *efx);
 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);
 
+static inline int efx_nic_event_test_irq_cpu(struct efx_channel *channel)
+{
+        return ACCESS_ONCE(channel->last_irq_cpu);
+}
+static inline int efx_nic_irq_test_irq_cpu(struct efx_nic *efx)
+{
+        return ACCESS_ONCE(efx->last_irq_cpu);
+}
+
 /* Global Resources */
 extern int efx_nic_flush_queues(struct efx_nic *efx);
 extern void falcon_start_nic_stats(struct efx_nic *efx);
diff --git a/drivers/net/ethernet/sfc/selftest.c b/drivers/net/ethernet/sfc/selftest.c
index e4b4c8a3abc6..aa4ab53cac57 100644
--- a/drivers/net/ethernet/sfc/selftest.c
+++ b/drivers/net/ethernet/sfc/selftest.c
@@ -149,11 +149,7 @@ static int efx_test_interrupts(struct efx_nic *efx,
         netif_dbg(efx, drv, efx->net_dev, "testing interrupts\n");
         tests->interrupt = -1;
 
-        /* Reset interrupt flag */
-        efx->last_irq_cpu = -1;
-        smp_wmb();
-
-        efx_nic_generate_interrupt(efx);
+        efx_nic_irq_test_start(efx);
         timeout = jiffies + IRQ_TIMEOUT;
         wait = 1;
 
@@ -161,7 +157,7 @@ static int efx_test_interrupts(struct efx_nic *efx,
         netif_dbg(efx, drv, efx->net_dev, "waiting for test interrupt\n");
         do {
                 schedule_timeout_uninterruptible(wait);
-                cpu = ACCESS_ONCE(efx->last_irq_cpu);
+                cpu = efx_nic_irq_test_irq_cpu(efx);
                 if (cpu >= 0)
                         goto success;
                 wait *= 2;
@@ -192,9 +188,7 @@ static int efx_test_eventq_irq(struct efx_nic *efx,
                 read_ptr[channel->channel] = channel->eventq_read_ptr;
                 set_bit(channel->channel, &dma_pend);
                 set_bit(channel->channel, &int_pend);
-                channel->last_irq_cpu = -1;
-                smp_wmb();
-                efx_nic_generate_test_event(channel);
+                efx_nic_event_test_start(channel);
         }
 
         timeout = jiffies + IRQ_TIMEOUT;
@@ -216,7 +210,7 @@ static int efx_test_eventq_irq(struct efx_nic *efx,
                         } else {
                                 if (efx_nic_event_present(channel))
                                         clear_bit(channel->channel, &dma_pend);
-                                if (ACCESS_ONCE(channel->last_irq_cpu) >= 0)
+                                if (efx_nic_event_test_irq_cpu(channel) >= 0)
                                         clear_bit(channel->channel, &int_pend);
                         }
                         napi_enable(&channel->napi_str);