[PATCH net-next v5 1/5] net: selftests: export packet creation helpers for driver use

[Raju Rangoju <Raju.Rangoju@amd.com>]

Export the network selftest packet creation infrastructure to allow
network drivers to reuse the existing selftest framework instead of
duplicating packet creation code.

Signed-off-by: Raju Rangoju <Raju.Rangoju@amd.com>
---
Changes since v4:
 - add inline keyword to static function in header file

Changes since v3:
 - add this patch to expose existing selftest framework for packet creation

 include/net/selftests.h | 45 ++++++++++++++++++++++++++++++++++++++
 net/core/selftests.c    | 48 ++++++-----------------------------------
 2 files changed, 52 insertions(+), 41 deletions(-)

diff --git a/include/net/selftests.h b/include/net/selftests.h
index e65e8d230d33..c36e07406ad4 100644
--- a/include/net/selftests.h
+++ b/include/net/selftests.h
@@ -3,9 +3,48 @@
 #define _NET_SELFTESTS
 
 #include <linux/ethtool.h>
+#include <linux/netdevice.h>
+
+struct net_packet_attrs {
+	const unsigned char *src;
+	const unsigned char *dst;
+	u32 ip_src;
+	u32 ip_dst;
+	bool tcp;
+	u16 sport;
+	u16 dport;
+	int timeout;
+	int size;
+	int max_size;
+	u8 id;
+	u16 queue_mapping;
+	bool bad_csum;
+};
+
+struct net_test_priv {
+	struct net_packet_attrs *packet;
+	struct packet_type pt;
+	struct completion comp;
+	int double_vlan;
+	int vlan_id;
+	int ok;
+};
+
+struct netsfhdr {
+	__be32 version;
+	__be64 magic;
+	u8 id;
+} __packed;
+
+#define NET_TEST_PKT_SIZE (sizeof(struct ethhdr) + sizeof(struct iphdr) + \
+			   sizeof(struct netsfhdr))
+#define NET_TEST_PKT_MAGIC	0xdeadcafecafedeadULL
+#define NET_LB_TIMEOUT		msecs_to_jiffies(200)
 
 #if IS_ENABLED(CONFIG_NET_SELFTESTS)
 
+struct sk_buff *net_test_get_skb(struct net_device *ndev, u8 id,
+				 struct net_packet_attrs *attr);
 void net_selftest(struct net_device *ndev, struct ethtool_test *etest,
 		  u64 *buf);
 int net_selftest_get_count(void);
@@ -13,6 +52,12 @@ void net_selftest_get_strings(u8 *data);
 
 #else
 
+static inline struct sk_buff *net_test_get_skb(struct net_device *ndev, u8 id,
+					       struct net_packet_attrs *attr)
+{
+	return NULL;
+}
+
 static inline void net_selftest(struct net_device *ndev, struct ethtool_test *etest,
 				u64 *buf)
 {
diff --git a/net/core/selftests.c b/net/core/selftests.c
index 3d79133a91a6..8b81feb82c4a 100644
--- a/net/core/selftests.c
+++ b/net/core/selftests.c
@@ -14,46 +14,10 @@
 #include <net/tcp.h>
 #include <net/udp.h>
 
-struct net_packet_attrs {
-	const unsigned char *src;
-	const unsigned char *dst;
-	u32 ip_src;
-	u32 ip_dst;
-	bool tcp;
-	u16 sport;
-	u16 dport;
-	int timeout;
-	int size;
-	int max_size;
-	u8 id;
-	u16 queue_mapping;
-	bool bad_csum;
-};
-
-struct net_test_priv {
-	struct net_packet_attrs *packet;
-	struct packet_type pt;
-	struct completion comp;
-	int double_vlan;
-	int vlan_id;
-	int ok;
-};
-
-struct netsfhdr {
-	__be32 version;
-	__be64 magic;
-	u8 id;
-} __packed;
-
 static u8 net_test_next_id;
 
-#define NET_TEST_PKT_SIZE (sizeof(struct ethhdr) + sizeof(struct iphdr) + \
-			   sizeof(struct netsfhdr))
-#define NET_TEST_PKT_MAGIC	0xdeadcafecafedeadULL
-#define NET_LB_TIMEOUT		msecs_to_jiffies(200)
-
-static struct sk_buff *net_test_get_skb(struct net_device *ndev,
-					struct net_packet_attrs *attr)
+struct sk_buff *net_test_get_skb(struct net_device *ndev, u8 id,
+				 struct net_packet_attrs *attr)
 {
 	struct sk_buff *skb = NULL;
 	struct udphdr *uhdr = NULL;
@@ -142,8 +106,8 @@ static struct sk_buff *net_test_get_skb(struct net_device *ndev,
 	shdr = skb_put(skb, sizeof(*shdr));
 	shdr->version = 0;
 	shdr->magic = cpu_to_be64(NET_TEST_PKT_MAGIC);
-	attr->id = net_test_next_id;
-	shdr->id = net_test_next_id++;
+	attr->id = id;
+	shdr->id = id;
 
 	if (attr->size) {
 		void *payload = skb_put(skb, attr->size);
@@ -190,6 +154,7 @@ static struct sk_buff *net_test_get_skb(struct net_device *ndev,
 
 	return skb;
 }
+EXPORT_SYMBOL_GPL(net_test_get_skb);
 
 static int net_test_loopback_validate(struct sk_buff *skb,
 				      struct net_device *ndev,
@@ -286,12 +251,13 @@ static int __net_test_loopback(struct net_device *ndev,
 	tpriv->packet = attr;
 	dev_add_pack(&tpriv->pt);
 
-	skb = net_test_get_skb(ndev, attr);
+	skb = net_test_get_skb(ndev, net_test_next_id, attr);
 	if (!skb) {
 		ret = -ENOMEM;
 		goto cleanup;
 	}
 
+	net_test_next_id++;
 	ret = dev_direct_xmit(skb, attr->queue_mapping);
 	if (ret < 0) {
 		goto cleanup;
-- 
2.34.1