sfc: Run event/IRQ self-test asynchronously when interface is brought up

Generate a test event on each event queue whenever the interface is
brought up, then after 1 second check that we have either handled a
test event or handled another IRQ for each event queue.

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 00e13ab..7683e53 100644 (file)
--- a/drivers/net/ethernet/sfc/efx.c
+++ b/drivers/net/ethernet/sfc/efx.c
@@ -25,6 +25,7 @@
 #include "net_driver.h"
 #include "efx.h"
 #include "nic.h"
+#include "selftest.h"
 
 #include "mcdi.h"
 #include "workarounds.h"
@@ -1564,8 +1565,9 @@ static void efx_start_all(struct efx_nic *efx)
  * since we're holding the rtnl_lock at this point. */
 static void efx_flush_all(struct efx_nic *efx)
 {
-       /* Make sure the hardware monitor is stopped */
+       /* Make sure the hardware monitor and event self-test are stopped */
        cancel_delayed_work_sync(&efx->monitor_work);
+       efx_selftest_async_cancel(efx);
        /* Stop scheduled port reconfigurations */
        cancel_work_sync(&efx->mac_work);
 }
@@ -1825,6 +1827,7 @@ static int efx_net_open(struct net_device *net_dev)
        efx_link_status_changed(efx);
 
        efx_start_all(efx);
+       efx_selftest_async_start(efx);
        return 0;
 }
 
@@ -2375,6 +2378,7 @@ static int efx_init_struct(struct efx_nic *efx, const struct efx_nic_type *type,
 #endif
        INIT_WORK(&efx->reset_work, efx_reset_work);
        INIT_DELAYED_WORK(&efx->monitor_work, efx_monitor);
+       INIT_DELAYED_WORK(&efx->selftest_work, efx_selftest_async_work);
        efx->pci_dev = pci_dev;
        efx->msg_enable = debug;
        efx->state = STATE_INIT;

diff --git a/drivers/net/ethernet/sfc/efx.h b/drivers/net/ethernet/sfc/efx.h
index 4debfe0..be8f915 100644 (file)
--- a/drivers/net/ethernet/sfc/efx.h
+++ b/drivers/net/ethernet/sfc/efx.h
@@ -148,7 +148,7 @@ static inline void efx_schedule_channel(struct efx_channel *channel)
 
 static inline void efx_schedule_channel_irq(struct efx_channel *channel)
 {
-       channel->last_irq_cpu = raw_smp_processor_id();
+       channel->event_test_cpu = raw_smp_processor_id();
        efx_schedule_channel(channel);
 }
 

diff --git a/drivers/net/ethernet/sfc/net_driver.h b/drivers/net/ethernet/sfc/net_driver.h
index 0b95505..27fe85f 100644 (file)
--- a/drivers/net/ethernet/sfc/net_driver.h
+++ b/drivers/net/ethernet/sfc/net_driver.h
@@ -325,7 +325,7 @@ enum efx_rx_alloc_method {
  * @eventq_mask: Event queue pointer mask
  * @eventq_read_ptr: Event queue read pointer
  * @last_eventq_read_ptr: Last event queue read pointer value.
- * @last_irq_cpu: Last CPU to handle interrupt for this channel
+ * @event_test_cpu: Last CPU to handle interrupt or test event for this channel
  * @irq_count: Number of IRQs since last adaptive moderation decision
  * @irq_mod_score: IRQ moderation score
  * @rx_alloc_level: Watermark based heuristic counter for pushing descriptors
@@ -356,8 +356,8 @@ struct efx_channel {
        unsigned int eventq_mask;
        unsigned int eventq_read_ptr;
        unsigned int last_eventq_read_ptr;
+       int event_test_cpu;
 
-       int last_irq_cpu;
        unsigned int irq_count;
        unsigned int irq_mod_score;
 #ifdef CONFIG_RFS_ACCEL
@@ -678,6 +678,7 @@ struct vfdi_status;
  * @irq_status: Interrupt status buffer
  * @irq_zero_count: Number of legacy IRQs seen with queue flags == 0
  * @irq_level: IRQ level/index for IRQs not triggered by an event queue
+ * @selftest_work: Work item for asynchronous self-test
  * @mtd_list: List of MTDs attached to the NIC
  * @nic_data: Hardware dependent state
  * @mac_lock: MAC access lock. Protects @port_enabled, @phy_mode,
@@ -791,6 +792,7 @@ struct efx_nic {
        struct efx_buffer irq_status;
        unsigned irq_zero_count;
        unsigned irq_level;
+       struct delayed_work selftest_work;
 
 #ifdef CONFIG_SFC_MTD
        struct list_head mtd_list;

diff --git a/drivers/net/ethernet/sfc/nic.c b/drivers/net/ethernet/sfc/nic.c
index 4c47b75..4a9a5be 100644 (file)
--- a/drivers/net/ethernet/sfc/nic.c
+++ b/drivers/net/ethernet/sfc/nic.c
@@ -1083,7 +1083,7 @@ efx_handle_generated_event(struct efx_channel *channel, efx_qword_t *event)
        code = _EFX_CHANNEL_MAGIC_CODE(magic);
 
        if (magic == EFX_CHANNEL_MAGIC_TEST(channel)) {
-               /* ignore */
+               channel->event_test_cpu = raw_smp_processor_id();
        } else if (rx_queue && magic == EFX_CHANNEL_MAGIC_FILL(rx_queue)) {
                /* The queue must be empty, so we won't receive any rx
                 * events, so efx_process_channel() won't refill the
@@ -1334,7 +1334,7 @@ void efx_nic_remove_eventq(struct efx_channel *channel)
 
 void efx_nic_event_test_start(struct efx_channel *channel)
 {
-       channel->last_irq_cpu = -1;
+       channel->event_test_cpu = -1;
        smp_wmb();
        efx_magic_event(channel, EFX_CHANNEL_MAGIC_TEST(channel));
 }

diff --git a/drivers/net/ethernet/sfc/nic.h b/drivers/net/ethernet/sfc/nic.h
index e0e8596..f46e2ce 100644 (file)
--- a/drivers/net/ethernet/sfc/nic.h
+++ b/drivers/net/ethernet/sfc/nic.h
@@ -311,7 +311,7 @@ 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);
+       return ACCESS_ONCE(channel->event_test_cpu);
 }
 static inline int efx_nic_irq_test_irq_cpu(struct efx_nic *efx)
 {

diff --git a/drivers/net/ethernet/sfc/selftest.c b/drivers/net/ethernet/sfc/selftest.c
index aa4ab53..de4c006 100644 (file)
--- a/drivers/net/ethernet/sfc/selftest.c
+++ b/drivers/net/ethernet/sfc/selftest.c
@@ -702,6 +702,8 @@ int efx_selftest(struct efx_nic *efx, struct efx_self_tests *tests,
        enum reset_type reset_method = RESET_TYPE_INVISIBLE;
        int rc_test = 0, rc_reset = 0, rc;
 
+       efx_selftest_async_cancel(efx);
+
        /* Online (i.e. non-disruptive) testing
         * This checks interrupt generation, event delivery and PHY presence. */
 
@@ -794,3 +796,36 @@ int efx_selftest(struct efx_nic *efx, struct efx_self_tests *tests,
        return rc_test;
 }
 
+void efx_selftest_async_start(struct efx_nic *efx)
+{
+       struct efx_channel *channel;
+
+       efx_for_each_channel(channel, efx)
+               efx_nic_event_test_start(channel);
+       schedule_delayed_work(&efx->selftest_work, IRQ_TIMEOUT);
+}
+
+void efx_selftest_async_cancel(struct efx_nic *efx)
+{
+       cancel_delayed_work_sync(&efx->selftest_work);
+}
+
+void efx_selftest_async_work(struct work_struct *data)
+{
+       struct efx_nic *efx = container_of(data, struct efx_nic,
+                                          selftest_work.work);
+       struct efx_channel *channel;
+       int cpu;
+
+       efx_for_each_channel(channel, efx) {
+               cpu = efx_nic_event_test_irq_cpu(channel);
+               if (cpu < 0)
+                       netif_err(efx, ifup, efx->net_dev,
+                                 "channel %d failed to trigger an interrupt\n",
+                                 channel->channel);
+               else
+                       netif_dbg(efx, ifup, efx->net_dev,
+                                 "channel %d triggered interrupt on CPU %d\n",
+                                 channel->channel, cpu);
+       }
+}

diff --git a/drivers/net/ethernet/sfc/selftest.h b/drivers/net/ethernet/sfc/selftest.h
index 87abe2a..aed24b7 100644 (file)
--- a/drivers/net/ethernet/sfc/selftest.h
+++ b/drivers/net/ethernet/sfc/selftest.h
@@ -48,5 +48,8 @@ extern void efx_loopback_rx_packet(struct efx_nic *efx,
 extern int efx_selftest(struct efx_nic *efx,
                        struct efx_self_tests *tests,
                        unsigned flags);
+extern void efx_selftest_async_start(struct efx_nic *efx);
+extern void efx_selftest_async_cancel(struct efx_nic *efx);
+extern void efx_selftest_async_work(struct work_struct *data);
 
 #endif /* EFX_SELFTEST_H */