net/ena/base: optimize branch prediction

PATCH Superseded Shai Brandes 1 participant 1 message Oct 15, 2025 Network drivers

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Shai Brandes

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2025-10-15 07:17 UTC #0 lore raw

PATCH 19/21 net/ena/base: optimize branch prediction

Add likely/unlikely compiler hints to optimize conditional logic

Signed-off-by Shai Brandes <[email protected]>

Reviewed-by Amit Bernstein <[email protected]>

Reviewed-by Yosef Raisman <[email protected]>

---
 drivers/net/ena/base/ena_eth_com.c | 4 ++--
 drivers/net/ena/base/ena_eth_com.h | 2 +-
 2 files changed, 3 insertions(+), 3 deletions(-)

drivers/net/ena/base/ena_eth_com.c +2 -2

index 653df389c4..8a019b3451 100644
@@ -241,7 +241,7 @@ static void *get_tx_sq_desc(struct ena_com_io_sq *io_sq)
 {
 	void *tx_desc;
 
-	if (io_sq->mem_queue_type == ENA_ADMIN_PLACEMENT_POLICY_DEV)
+	if (likely(io_sq->mem_queue_type == ENA_ADMIN_PLACEMENT_POLICY_DEV))
 		return get_sq_desc_llq(io_sq);
 
 	tx_desc = get_sq_desc_regular_queue(io_sq);

@@ -291,7 +291,7 @@ static int ena_com_sq_update_reqular_queue_tail(struct ena_com_io_sq *io_sq)
 
 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)
+	if (likely(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);

drivers/net/ena/base/ena_eth_com.h +1 -1

index f25e26840d..1fc92ffb55 100644
@@ -110,7 +110,7 @@ static inline bool ena_com_sq_have_enough_space(struct ena_com_io_sq *io_sq,
 {
 	int temp;
 
-	if (io_sq->mem_queue_type == ENA_ADMIN_PLACEMENT_POLICY_HOST)
+	if (unlikely(io_sq->mem_queue_type == ENA_ADMIN_PLACEMENT_POLICY_HOST))
 		return ena_com_free_q_entries(io_sq) >= required_buffers;
 
 	/* This calculation doesn't need to be 100% accurate. So to reduce

Signature · 1 line

2.17.1