[PATCH v4 20/31] net/ena/base: rework Rx ring submission queue

[<shaibran@amazon.com>]

From: Shai Brandes <shaibran@amazon.com>

RX ring submission queue descriptors are always located in host memory
This optimization replaces the generic update tail method with a
tailored method for host memory type descriptors to avoid unnecessary if
statement.

Signed-off-by: Shai Brandes <shaibran@amazon.com>
Reviewed-by: Amit Bernstein <amitbern@amazon.com>
---
 drivers/net/ena/base/ena_eth_com.c | 15 ++++++++++-----
 1 file changed, 10 insertions(+), 5 deletions(-)

diff --git a/drivers/net/ena/base/ena_eth_com.c b/drivers/net/ena/base/ena_eth_com.c
index f672df1001..ce25e60ac4 100644
--- a/drivers/net/ena/base/ena_eth_com.c
+++ b/drivers/net/ena/base/ena_eth_com.c
@@ -209,11 +209,8 @@ static int ena_com_sq_update_llq_tail(struct ena_com_io_sq *io_sq)
 	return ENA_COM_OK;
 }
 
-static int ena_com_sq_update_tail(struct ena_com_io_sq *io_sq)
+static int ena_com_sq_update_reqular_queue_tail(struct ena_com_io_sq *io_sq)
 {
-	if (io_sq->mem_queue_type == ENA_ADMIN_PLACEMENT_POLICY_DEV)
-		return ena_com_sq_update_llq_tail(io_sq);
-
 	io_sq->tail++;
 
 	/* Switch phase bit in case of wrap around */
@@ -223,6 +220,14 @@ static int ena_com_sq_update_tail(struct ena_com_io_sq *io_sq)
 	return ENA_COM_OK;
 }
 
+static int ena_com_sq_update_tail(struct ena_com_io_sq *io_sq)
+{
+	if (io_sq->mem_queue_type == ENA_ADMIN_PLACEMENT_POLICY_DEV)
+		return ena_com_sq_update_llq_tail(io_sq);
+
+	return ena_com_sq_update_reqular_queue_tail(io_sq);
+}
+
 static struct ena_eth_io_rx_cdesc_base *
 	ena_com_rx_cdesc_idx_to_ptr(struct ena_com_io_cq *io_cq, u16 idx)
 {
@@ -661,7 +666,7 @@ int ena_com_add_single_rx_desc(struct ena_com_io_sq *io_sq,
 	desc->buff_addr_hi =
 		((ena_buf->paddr & GENMASK_ULL(io_sq->dma_addr_bits - 1, 32)) >> 32);
 
-	return ena_com_sq_update_tail(io_sq);
+	return ena_com_sq_update_reqular_queue_tail(io_sq);
 }
 
 bool ena_com_cq_empty(struct ena_com_io_cq *io_cq)
-- 
2.17.1