sfc: Add TX merged completion counter

Add a counter for TX merged completion events.

This is implemented in the common TX path, because the NIC event
handlers only know how many descriptors were completed, not how many
packets.

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

1 files changed, 3 insertions, 0 deletions

diff --git a/drivers/net/ethernet/sfc/tx.c b/drivers/net/ethernet/sfc/tx.c
index 4903c4f7f292..85ee647b28ad 100644
--- a/drivers/net/ethernet/sfc/tx.c
+++ b/drivers/net/ethernet/sfc/tx.c
@@ -437,6 +437,9 @@ void efx_xmit_done(struct efx_tx_queue *tx_queue, unsigned int index)
         efx_dequeue_buffers(tx_queue, index, &pkts_compl, &bytes_compl);
         netdev_tx_completed_queue(tx_queue->core_txq, pkts_compl, bytes_compl);
 
+        if (pkts_compl > 1)
+                ++tx_queue->merge_events;
+
         /* See if we need to restart the netif queue.  This memory
          * barrier ensures that we write read_count (inside
          * efx_dequeue_buffers()) before reading the queue status.