netdev - [PATCH net-next] net: veth: make PAGE_POOL

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Message-Id: <c9e132c3f08c456ad0462342bb0a104f0f8c0b24.1683622992.git.lorenzo@kernel.org>
Date: Tue,  9 May 2023 11:05:16 +0200
From: Lorenzo Bianconi <lorenzo@...nel.org>
To: netdev@...r.kernel.org
Cc: lorenzo.bianconi@...hat.com,
	bpf@...r.kernel.org,
	davem@...emloft.net,
	edumazet@...gle.com,
	kuba@...nel.org,
	pabeni@...hat.com,
	hawk@...nel.org,
	john.fastabend@...il.com,
	linyunsheng@...wei.com,
	ast@...nel.org,
	daniel@...earbox.net,
	jbenc@...hat.com
Subject: [PATCH net-next] net: veth: make PAGE_POOL_STATS optional

Since veth is very likely to be enabled and there are some drivers
(e.g. mlx5) where CONFIG_PAGE_POOL_STATS is optional, make
CONFIG_PAGE_POOL_STATS optional for veth too in order to keep it
optional when required.

Suggested-by: Jiri Benc <jbenc@...hat.com>
Signed-off-by: Lorenzo Bianconi <lorenzo@...nel.org>
---
 drivers/net/Kconfig |  1 -
 drivers/net/veth.c  | 24 +++++++++++++++++-------
 2 files changed, 17 insertions(+), 8 deletions(-)

diff --git a/drivers/net/Kconfig b/drivers/net/Kconfig
index d0a1ed216d15..368c6f5b327e 100644
--- a/drivers/net/Kconfig
+++ b/drivers/net/Kconfig
@@ -403,7 +403,6 @@ config TUN_VNET_CROSS_LE
 config VETH
 	tristate "Virtual ethernet pair device"
 	select PAGE_POOL
-	select PAGE_POOL_STATS
 	help
 	  This device is a local ethernet tunnel. Devices are created in pairs.
 	  When one end receives the packet it appears on its pair and vice
diff --git a/drivers/net/veth.c b/drivers/net/veth.c
index 3ae496011640..614f3e3efab0 100644
--- a/drivers/net/veth.c
+++ b/drivers/net/veth.c
@@ -176,12 +176,27 @@ static int veth_get_sset_count(struct net_device *dev, int sset)
 	}
 }
 
+static void veth_get_page_pool_stats(struct net_device *dev, u64 *data)
+{
+#ifdef CONFIG_PAGE_POOL_STATS
+	struct veth_priv *priv = netdev_priv(dev);
+	struct page_pool_stats pp_stats = {};
+	int i;
+
+	for (i = 0; i < dev->real_num_rx_queues; i++) {
+		if (!priv->rq[i].page_pool)
+			continue;
+		page_pool_get_stats(priv->rq[i].page_pool, &pp_stats);
+	}
+	page_pool_ethtool_stats_get(data, &pp_stats);
+#endif /* CONFIG_PAGE_POOL_STATS */
+}
+
 static void veth_get_ethtool_stats(struct net_device *dev,
 		struct ethtool_stats *stats, u64 *data)
 {
 	struct veth_priv *rcv_priv, *priv = netdev_priv(dev);
 	struct net_device *peer = rtnl_dereference(priv->peer);
-	struct page_pool_stats pp_stats = {};
 	int i, j, idx, pp_idx;
 
 	data[0] = peer ? peer->ifindex : 0;
@@ -225,12 +240,7 @@ static void veth_get_ethtool_stats(struct net_device *dev,
 	}
 
 page_pool_stats:
-	for (i = 0; i < dev->real_num_rx_queues; i++) {
-		if (!priv->rq[i].page_pool)
-			continue;
-		page_pool_get_stats(priv->rq[i].page_pool, &pp_stats);
-	}
-	page_pool_ethtool_stats_get(&data[pp_idx], &pp_stats);
+	veth_get_page_pool_stats(dev, &data[pp_idx]);
 }
 
 static void veth_get_channels(struct net_device *dev,
-- 
2.40.1