netdev - [Patch v1 net-next 08/10] net: ena: aggregate doorbell common operations into a function

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Message-ID: <20210608160118.3767932-9-shayagr@amazon.com>
Date:   Tue, 8 Jun 2021 19:01:16 +0300
From:   Shay Agroskin <shayagr@...zon.com>
To:     David Miller <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>, <netdev@...r.kernel.org>
CC:     Shay Agroskin <shayagr@...zon.com>,
        "Woodhouse, David" <dwmw@...zon.com>,
        "Machulsky, Zorik" <zorik@...zon.com>,
        "Matushevsky, Alexander" <matua@...zon.com>,
        Saeed Bshara <saeedb@...zon.com>,
        "Wilson, Matt" <msw@...zon.com>,
        "Liguori, Anthony" <aliguori@...zon.com>,
        "Bshara, Nafea" <nafea@...zon.com>,
        "Belgazal, Netanel" <netanel@...zon.com>,
        "Saidi, Ali" <alisaidi@...zon.com>,
        "Herrenschmidt, Benjamin" <benh@...zon.com>,
        "Kiyanovski, Arthur" <akiyano@...zon.com>,
        "Dagan, Noam" <ndagan@...zon.com>, Ido Segev <idose@...zon.com>
Subject: [Patch v1 net-next 08/10] net: ena: aggregate doorbell common operations into a function

The ena_ring_tx_doorbell() is introduced to call the doorbell and
increase the driver's corresponding stat.

Signed-off-by: Ido Segev <idose@...zon.com>
Signed-off-by: Shay Agroskin <shayagr@...zon.com>
---
 drivers/net/ethernet/amazon/ena/ena_netdev.c | 38 ++++++++++----------
 1 file changed, 18 insertions(+), 20 deletions(-)

diff --git a/drivers/net/ethernet/amazon/ena/ena_netdev.c b/drivers/net/ethernet/amazon/ena/ena_netdev.c
index 6e648b6882b7..37c839401c6c 100644
--- a/drivers/net/ethernet/amazon/ena/ena_netdev.c
+++ b/drivers/net/ethernet/amazon/ena/ena_netdev.c
@@ -86,6 +86,12 @@ static void ena_increase_stat(u64 *statp, u64 cnt,
 	u64_stats_update_end(syncp);
 }
 
+static void ena_ring_tx_doorbell(struct ena_ring *tx_ring)
+{
+	ena_com_write_sq_doorbell(tx_ring->ena_com_io_sq);
+	ena_increase_stat(&tx_ring->tx_stats.doorbells, 1, &tx_ring->syncp);
+}
+
 static void ena_tx_timeout(struct net_device *dev, unsigned int txqueue)
 {
 	struct ena_adapter *adapter = netdev_priv(dev);
@@ -144,7 +150,7 @@ static int ena_xmit_common(struct net_device *dev,
 		netif_dbg(adapter, tx_queued, dev,
 			  "llq tx max burst size of queue %d achieved, writing doorbell to send burst\n",
 			  ring->qid);
-		ena_com_write_sq_doorbell(ring->ena_com_io_sq);
+		ena_ring_tx_doorbell(ring);
 	}
 
 	/* prepare the packet's descriptors to dma engine */
@@ -313,14 +319,12 @@ static int ena_xdp_xmit_frame(struct ena_ring *xdp_ring,
 			     xdpf->len);
 	if (rc)
 		goto error_unmap_dma;
-	/* trigger the dma engine. ena_com_write_sq_doorbell()
-	 * has a mb
+
+	/* trigger the dma engine. ena_ring_tx_doorbell()
+	 * calls a memory barrier inside it.
 	 */
-	if (flags & XDP_XMIT_FLUSH) {
-		ena_com_write_sq_doorbell(xdp_ring->ena_com_io_sq);
-		ena_increase_stat(&xdp_ring->tx_stats.doorbells, 1,
-				  &xdp_ring->syncp);
-	}
+	if (flags & XDP_XMIT_FLUSH)
+		ena_ring_tx_doorbell(xdp_ring);
 
 	return rc;
 
@@ -361,11 +365,8 @@ static int ena_xdp_xmit(struct net_device *dev, int n,
 	}
 
 	/* Ring doorbell to make device aware of the packets */
-	if (flags & XDP_XMIT_FLUSH) {
-		ena_com_write_sq_doorbell(xdp_ring->ena_com_io_sq);
-		ena_increase_stat(&xdp_ring->tx_stats.doorbells, 1,
-				  &xdp_ring->syncp);
-	}
+	if (flags & XDP_XMIT_FLUSH)
+		ena_ring_tx_doorbell(xdp_ring);
 
 	spin_unlock(&xdp_ring->xdp_tx_lock);
 
@@ -3100,14 +3101,11 @@ static netdev_tx_t ena_start_xmit(struct sk_buff *skb, struct net_device *dev)
 		}
 	}
 
-	if (netif_xmit_stopped(txq) || !netdev_xmit_more()) {
-		/* trigger the dma engine. ena_com_write_sq_doorbell()
-		 * has a mb
+	if (netif_xmit_stopped(txq) || !netdev_xmit_more())
+		/* trigger the dma engine. ena_ring_tx_doorbell()
+		 * calls a memory barrier inside it.
 		 */
-		ena_com_write_sq_doorbell(tx_ring->ena_com_io_sq);
-		ena_increase_stat(&tx_ring->tx_stats.doorbells, 1,
-				  &tx_ring->syncp);
-	}
+		ena_ring_tx_doorbell(tx_ring);
 
 	return NETDEV_TX_OK;
 
-- 
2.25.1