[PATCH net-next v2] net: mana: Set default number of queues to 16

[Long Li <longli@microsoft.com>]

Set the default number of queues per vPort to MANA_DEF_NUM_QUEUES (16),
as 16 queues can achieve optimal throughput for typical workloads. The
actual number of queues may be lower if it exceeds the hardware reported
limit. Users can increase the number of queues up to max_queues via
ethtool if needed.

Signed-off-by: Long Li <longli@microsoft.com>
---
v2:
  - Updated commit message to clarify that the actual number of queues
    may be lower if it exceeds the hardware reported limit.

 drivers/net/ethernet/microsoft/mana/mana_en.c | 3 ++-
 include/net/mana/mana.h                       | 1 +
 2 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/microsoft/mana/mana_en.c b/drivers/net/ethernet/microsoft/mana/mana_en.c
index 49c65cc1697c..b39e8b920791 100644
--- a/drivers/net/ethernet/microsoft/mana/mana_en.c
+++ b/drivers/net/ethernet/microsoft/mana/mana_en.c
@@ -3357,7 +3357,8 @@ static int mana_probe_port(struct mana_context *ac, int port_idx,
 	apc->ac = ac;
 	apc->ndev = ndev;
 	apc->max_queues = gc->max_num_queues;
-	apc->num_queues = gc->max_num_queues;
+	/* Use MANA_DEF_NUM_QUEUES as default, still honoring the HW limit */
+	apc->num_queues = min(gc->max_num_queues, MANA_DEF_NUM_QUEUES);
 	apc->tx_queue_size = DEF_TX_BUFFERS_PER_QUEUE;
 	apc->rx_queue_size = DEF_RX_BUFFERS_PER_QUEUE;
 	apc->port_handle = INVALID_MANA_HANDLE;
diff --git a/include/net/mana/mana.h b/include/net/mana/mana.h
index 3336688fed5e..96d21cbbdee2 100644
--- a/include/net/mana/mana.h
+++ b/include/net/mana/mana.h
@@ -1007,6 +1007,7 @@ struct mana_deregister_filter_resp {
 #define STATISTICS_FLAGS_TX_ERRORS_GDMA_ERROR		0x0000000004000000
 
 #define MANA_MAX_NUM_QUEUES 64
+#define MANA_DEF_NUM_QUEUES 16
 
 #define MANA_SHORT_VPORT_OFFSET_MAX ((1U << 8) - 1)
 
-- 
2.43.0