From: Arthur Kiyanovski <akiyano@amazon.com>
Date: Thu, 11 Oct 2018 11:26:16 +0300
Subject: [PATCH 02/19] net: ena: minor performance improvement
Origin: https://git.kernel.org/linus/0e575f8542d1f4d74df30b5a9ba419c5373d01a1

Reduce fastpath overhead by making ena_com_tx_comp_req_id_get() inline.
Also move it to ena_eth_com.h file with its dependency function
ena_com_cq_inc_head().

Signed-off-by: Arthur Kiyanovski <akiyano@amazon.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---
 drivers/net/ethernet/amazon/ena/ena_eth_com.c | 43 -----------------
 drivers/net/ethernet/amazon/ena/ena_eth_com.h | 46 ++++++++++++++++++-
 2 files changed, 44 insertions(+), 45 deletions(-)

Index: linux/drivers/net/ethernet/amazon/ena/ena_eth_com.c
===================================================================
--- linux.orig/drivers/net/ethernet/amazon/ena/ena_eth_com.c
+++ linux/drivers/net/ethernet/amazon/ena/ena_eth_com.c
@@ -59,15 +59,6 @@ static inline struct ena_eth_io_rx_cdesc
 	return cdesc;
 }
 
-static inline void ena_com_cq_inc_head(struct ena_com_io_cq *io_cq)
-{
-	io_cq->head++;
-
-	/* Switch phase bit in case of wrap around */
-	if (unlikely((io_cq->head & (io_cq->q_depth - 1)) == 0))
-		io_cq->phase ^= 1;
-}
-
 static inline void *get_sq_desc(struct ena_com_io_sq *io_sq)
 {
 	u16 tail_masked;
@@ -476,40 +467,6 @@ int ena_com_add_single_rx_desc(struct en
 
 	return 0;
 }
-
-int ena_com_tx_comp_req_id_get(struct ena_com_io_cq *io_cq, u16 *req_id)
-{
-	u8 expected_phase, cdesc_phase;
-	struct ena_eth_io_tx_cdesc *cdesc;
-	u16 masked_head;
-
-	masked_head = io_cq->head & (io_cq->q_depth - 1);
-	expected_phase = io_cq->phase;
-
-	cdesc = (struct ena_eth_io_tx_cdesc *)
-		((uintptr_t)io_cq->cdesc_addr.virt_addr +
-		(masked_head * io_cq->cdesc_entry_size_in_bytes));
-
-	/* When the current completion descriptor phase isn't the same as the
-	 * expected, it mean that the device still didn't update
-	 * this completion.
-	 */
-	cdesc_phase = READ_ONCE(cdesc->flags) & ENA_ETH_IO_TX_CDESC_PHASE_MASK;
-	if (cdesc_phase != expected_phase)
-		return -EAGAIN;
-
-	dma_rmb();
-	if (unlikely(cdesc->req_id >= io_cq->q_depth)) {
-		pr_err("Invalid req id %d\n", cdesc->req_id);
-		return -EINVAL;
-	}
-
-	ena_com_cq_inc_head(io_cq);
-
-	*req_id = READ_ONCE(cdesc->req_id);
-
-	return 0;
-}
 
 bool ena_com_cq_empty(struct ena_com_io_cq *io_cq)
 {
Index: linux/drivers/net/ethernet/amazon/ena/ena_eth_com.h
===================================================================
--- linux.orig/drivers/net/ethernet/amazon/ena/ena_eth_com.h
+++ linux/drivers/net/ethernet/amazon/ena/ena_eth_com.h
@@ -86,8 +86,6 @@ int ena_com_add_single_rx_desc(struct en
 			       struct ena_com_buf *ena_buf,
 			       u16 req_id);
 
-int ena_com_tx_comp_req_id_get(struct ena_com_io_cq *io_cq, u16 *req_id);
-
 bool ena_com_cq_empty(struct ena_com_io_cq *io_cq);
 
 static inline void ena_com_unmask_intr(struct ena_com_io_cq *io_cq,
@@ -159,4 +157,48 @@ static inline void ena_com_comp_ack(stru
 	io_sq->next_to_comp += elem;
 }
 
+static inline void ena_com_cq_inc_head(struct ena_com_io_cq *io_cq)
+{
+	io_cq->head++;
+
+	/* Switch phase bit in case of wrap around */
+	if (unlikely((io_cq->head & (io_cq->q_depth - 1)) == 0))
+		io_cq->phase ^= 1;
+}
+
+static inline int ena_com_tx_comp_req_id_get(struct ena_com_io_cq *io_cq,
+					     u16 *req_id)
+{
+	u8 expected_phase, cdesc_phase;
+	struct ena_eth_io_tx_cdesc *cdesc;
+	u16 masked_head;
+
+	masked_head = io_cq->head & (io_cq->q_depth - 1);
+	expected_phase = io_cq->phase;
+
+	cdesc = (struct ena_eth_io_tx_cdesc *)
+		((uintptr_t)io_cq->cdesc_addr.virt_addr +
+		(masked_head * io_cq->cdesc_entry_size_in_bytes));
+
+	/* When the current completion descriptor phase isn't the same as the
+	 * expected, it mean that the device still didn't update
+	 * this completion.
+	 */
+	cdesc_phase = READ_ONCE(cdesc->flags) & ENA_ETH_IO_TX_CDESC_PHASE_MASK;
+	if (cdesc_phase != expected_phase)
+		return -EAGAIN;
+
+	dma_rmb();
+
+	*req_id = READ_ONCE(cdesc->req_id);
+	if (unlikely(*req_id >= io_cq->q_depth)) {
+		pr_err("Invalid req id %d\n", cdesc->req_id);
+		return -EINVAL;
+	}
+
+	ena_com_cq_inc_head(io_cq);
+
+	return 0;
+}
+
 #endif /* ENA_ETH_COM_H_ */
