sfc: Allow DRV_GEN events to be used outside of selftests

Formerly, efx_test_eventq_irq() assumed it was the only user of
driver generated events. Allow it to interoperate with other users.

We can create more than 16 channels, so align event codes with
a multiple of 256 not 16.

Signed-off-by: Ben Hutchings <bhutchings@solarflare.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 10 insertions, 7 deletions

diff --git a/drivers/net/sfc/nic.c b/drivers/net/sfc/nic.c
index ec0bb80f5ae8..ca9cf1a33803 100644
--- a/drivers/net/sfc/nic.c
+++ b/drivers/net/sfc/nic.c
@@ -79,6 +79,10 @@ MODULE_PARM_DESC(rx_xon_thresh_bytes, "RX fifo XON threshold");
 /* Depth of RX flush request fifo */
 #define EFX_RX_FLUSH_COUNT 4
 
+/* Magic value for efx_generate_test_event() */
+#define EFX_CHANNEL_MAGIC(_channel)                     \
+        (0x00010100 + (_channel)->channel)
+
 /**************************************************************************
  *
  * Solarstorm hardware access
@@ -993,8 +997,10 @@ int efx_nic_process_eventq(struct efx_channel *channel, int budget)
                         }
                         break;
                 case FSE_AZ_EV_CODE_DRV_GEN_EV:
-                        channel->eventq_magic = EFX_QWORD_FIELD(
-                                event, FSF_AZ_DRV_GEN_EV_MAGIC);
+                        if (EFX_QWORD_FIELD(event, FSF_AZ_DRV_GEN_EV_MAGIC)
+                            == EFX_CHANNEL_MAGIC(channel))
+                                ++channel->magic_count;
+
                         EFX_LOG(channel->efx, "channel %d received generated "
                                 "event "EFX_QWORD_FMT"\n", channel->channel,
                                 EFX_QWORD_VAL(event));
@@ -1088,12 +1094,9 @@ void efx_nic_remove_eventq(struct efx_channel *channel)
 }
 
 
-/* Generates a test event on the event queue.  A subsequent call to
- * process_eventq() should pick up the event and place the value of
- * "magic" into channel->eventq_magic;
- */
-void efx_nic_generate_test_event(struct efx_channel *channel, unsigned int magic)
+void efx_nic_generate_test_event(struct efx_channel *channel)
 {
+        unsigned int magic = EFX_CHANNEL_MAGIC(channel);
         efx_qword_t test_event;
 
         EFX_POPULATE_QWORD_2(test_event, FSF_AZ_EV_CODE,