netdev - [PATCH net-next] bareudp: Added attribute to enable & disable rx metadata collection

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Message-Id: <1593366503-2831-1-git-send-email-martinvarghesenokia@gmail.com>
Date:   Sun, 28 Jun 2020 23:18:23 +0530
From:   Martin Varghese <martinvarghesenokia@...il.com>
To:     netdev@...r.kernel.org, davem@...emloft.net
Cc:     Martin <martin.varghese@...ia.com>
Subject: [PATCH net-next] bareudp: Added attribute to enable & disable rx metadata collection

From: Martin <martin.varghese@...ia.com>

Metadata need not be collected in receive if the packet from bareudp
device is not targeted to openvswitch.

Signed-off-by: Martin <martin.varghese@...ia.com>
---
 Documentation/networking/bareudp.rst |  6 ++++--
 drivers/net/bareudp.c                | 23 +++++++++++++++++------
 include/net/bareudp.h                |  1 +
 include/uapi/linux/if_link.h         |  1 +
 4 files changed, 23 insertions(+), 8 deletions(-)

diff --git a/Documentation/networking/bareudp.rst b/Documentation/networking/bareudp.rst
index 465a8b2..0e00636 100644
--- a/Documentation/networking/bareudp.rst
+++ b/Documentation/networking/bareudp.rst
@@ -48,5 +48,7 @@ enabled.
 The bareudp device could be used along with OVS or flower filter in TC.
 The OVS or TC flower layer must set the tunnel information in SKB dst field before
 sending packet buffer to the bareudp device for transmission. On reception the
-bareudp device extracts and stores the tunnel information in SKB dst field before
-passing the packet buffer to the network stack.
+bareudp device decapsulates the udp header and passes the inner packet to the
+network stack. If RX_COLLECT_METADATA flag is enabled in the device the tunnel
+information will be stored in the SKB dst field before the packet buffer is
+passed to the network stack.
diff --git a/drivers/net/bareudp.c b/drivers/net/bareudp.c
index 3dd46cd..108a8ca 100644
--- a/drivers/net/bareudp.c
+++ b/drivers/net/bareudp.c
@@ -46,6 +46,7 @@ struct bareudp_dev {
 	__be16             port;
 	u16	           sport_min;
 	bool               multi_proto_mode;
+	bool               rx_collect_metadata;
 	struct socket      __rcu *sock;
 	struct list_head   next;        /* bareudp node  on namespace list */
 	struct gro_cells   gro_cells;
@@ -125,13 +126,14 @@ static int bareudp_udp_encap_recv(struct sock *sk, struct sk_buff *skb)
 		bareudp->dev->stats.rx_dropped++;
 		goto drop;
 	}
-
-	tun_dst = udp_tun_rx_dst(skb, family, TUNNEL_KEY, 0, 0);
-	if (!tun_dst) {
-		bareudp->dev->stats.rx_dropped++;
-		goto drop;
+	if (bareudp->rx_collect_metadata) {
+		tun_dst = udp_tun_rx_dst(skb, family, TUNNEL_KEY, 0, 0);
+		if (!tun_dst) {
+			bareudp->dev->stats.rx_dropped++;
+			goto drop;
+		}
+		skb_dst_set(skb, &tun_dst->dst);
 	}
-	skb_dst_set(skb, &tun_dst->dst);
 	skb->dev = bareudp->dev;
 	oiph = skb_network_header(skb);
 	skb_reset_network_header(skb);
@@ -575,6 +577,9 @@ static int bareudp2info(struct nlattr *data[], struct bareudp_conf *conf,
 	if (data[IFLA_BAREUDP_MULTIPROTO_MODE])
 		conf->multi_proto_mode = true;
 
+	if (data[IFLA_BAREUDP_RX_COLLECT_METADATA])
+		conf->rx_collect_metadata = true;
+
 	return 0;
 }
 
@@ -612,6 +617,8 @@ static int bareudp_configure(struct net *net, struct net_device *dev,
 	bareudp->ethertype = conf->ethertype;
 	bareudp->sport_min = conf->sport_min;
 	bareudp->multi_proto_mode = conf->multi_proto_mode;
+	bareudp->rx_collect_metadata = conf->rx_collect_metadata;
+
 	err = register_netdevice(dev);
 	if (err)
 		return err;
@@ -669,6 +676,7 @@ static size_t bareudp_get_size(const struct net_device *dev)
 		nla_total_size(sizeof(__be16)) +  /* IFLA_BAREUDP_ETHERTYPE */
 		nla_total_size(sizeof(__u16))  +  /* IFLA_BAREUDP_SRCPORT_MIN */
 		nla_total_size(0)              +  /* IFLA_BAREUDP_MULTIPROTO_MODE */
+		nla_total_size(0)              +  /* IFLA_BAREUDP_RX_COLLECT_METADATA */
 		0;
 }
 
@@ -685,6 +693,9 @@ static int bareudp_fill_info(struct sk_buff *skb, const struct net_device *dev)
 	if (bareudp->multi_proto_mode &&
 	    nla_put_flag(skb, IFLA_BAREUDP_MULTIPROTO_MODE))
 		goto nla_put_failure;
+	if (bareudp->rx_collect_metadata &&
+	    nla_put_flag(skb, IFLA_BAREUDP_RX_COLLECT_METADATA))
+		goto nla_put_failure;
 
 	return 0;
 
diff --git a/include/net/bareudp.h b/include/net/bareudp.h
index dc65a0d..3dd5f9a 100644
--- a/include/net/bareudp.h
+++ b/include/net/bareudp.h
@@ -12,6 +12,7 @@ struct bareudp_conf {
 	__be16 port;
 	u16 sport_min;
 	bool multi_proto_mode;
+	bool rx_collect_metadata;
 };
 
 struct net_device *bareudp_dev_create(struct net *net, const char *name,
diff --git a/include/uapi/linux/if_link.h b/include/uapi/linux/if_link.h
index a009365..cc185a0 100644
--- a/include/uapi/linux/if_link.h
+++ b/include/uapi/linux/if_link.h
@@ -600,6 +600,7 @@ enum {
 	IFLA_BAREUDP_ETHERTYPE,
 	IFLA_BAREUDP_SRCPORT_MIN,
 	IFLA_BAREUDP_MULTIPROTO_MODE,
+	IFLA_BAREUDP_RX_COLLECT_METADATA,
 	__IFLA_BAREUDP_MAX
 };
 
-- 
1.8.3.1