net: move gso declarations and functions to their own files

Move declarations into include/net/gso.h and code into net/core/gso.c

Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Stanislav Fomichev <sdf@google.com>
Reviewed-by: Simon Horman <simon.horman@corigine.com>
Reviewed-by: David Ahern <dsahern@kernel.org>
Link: https://lore.kernel.org/r/20230608191738.3947077-1-edumazet@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

5 files changed, 112 insertions, 96 deletions

diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index c2f0c6002a84..2d6cb2bf2f05 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -4827,13 +4827,6 @@ int skb_crc32c_csum_help(struct sk_buff *skb);
 int skb_csum_hwoffload_help(struct sk_buff *skb,
 			    const netdev_features_t features);
 
-struct sk_buff *__skb_gso_segment(struct sk_buff *skb,
-				  netdev_features_t features, bool tx_path);
-struct sk_buff *skb_eth_gso_segment(struct sk_buff *skb,
-				    netdev_features_t features, __be16 type);
-struct sk_buff *skb_mac_gso_segment(struct sk_buff *skb,
-				    netdev_features_t features);
-
 struct netdev_bonding_info {
 	ifslave	slave;
 	ifbond	master;
@@ -4856,11 +4849,6 @@ static inline void ethtool_notify(struct net_device *dev, unsigned int cmd,
 }
 #endif
 
-static inline
-struct sk_buff *skb_gso_segment(struct sk_buff *skb, netdev_features_t features)
-{
-	return __skb_gso_segment(skb, features, true);
-}
 __be16 skb_network_protocol(struct sk_buff *skb, int *depth);
 
 static inline bool can_checksum_protocol(netdev_features_t features,
@@ -4987,6 +4975,7 @@ netdev_features_t passthru_features_check(struct sk_buff *skb,
 					  struct net_device *dev,
 					  netdev_features_t features);
 netdev_features_t netif_skb_features(struct sk_buff *skb);
+void skb_warn_bad_offload(const struct sk_buff *skb);
 
 static inline bool net_gso_ok(netdev_features_t features, int gso_type)
 {
@@ -5035,19 +5024,6 @@ void netif_set_tso_max_segs(struct net_device *dev, unsigned int segs);
 void netif_inherit_tso_max(struct net_device *to,
 			   const struct net_device *from);
 
-static inline void skb_gso_error_unwind(struct sk_buff *skb, __be16 protocol,
-					int pulled_hlen, u16 mac_offset,
-					int mac_len)
-{
-	skb->protocol = protocol;
-	skb->encapsulation = 1;
-	skb_push(skb, pulled_hlen);
-	skb_reset_transport_header(skb);
-	skb->mac_header = mac_offset;
-	skb->network_header = skb->mac_header + mac_len;
-	skb->mac_len = mac_len;
-}
-
 static inline bool netif_is_macsec(const struct net_device *dev)
 {
 	return dev->priv_flags & IFF_MACSEC;
diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index e2f48ddb2f7c..91ed66952580 100644
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -3974,8 +3974,6 @@ int skb_zerocopy(struct sk_buff *to, struct sk_buff *from,
 void skb_split(struct sk_buff *skb, struct sk_buff *skb1, const u32 len);
 int skb_shift(struct sk_buff *tgt, struct sk_buff *skb, int shiftlen);
 void skb_scrub_packet(struct sk_buff *skb, bool xnet);
-bool skb_gso_validate_network_len(const struct sk_buff *skb, unsigned int mtu);
-bool skb_gso_validate_mac_len(const struct sk_buff *skb, unsigned int len);
 struct sk_buff *skb_segment(struct sk_buff *skb, netdev_features_t features);
 struct sk_buff *skb_segment_list(struct sk_buff *skb, netdev_features_t features,
 				 unsigned int offset);
@@ -4841,75 +4839,6 @@ static inline struct sec_path *skb_sec_path(const struct sk_buff *skb)
 #endif
 }
 
-/* Keeps track of mac header offset relative to skb->head.
- * It is useful for TSO of Tunneling protocol. e.g. GRE.
- * For non-tunnel skb it points to skb_mac_header() and for
- * tunnel skb it points to outer mac header.
- * Keeps track of level of encapsulation of network headers.
- */
-struct skb_gso_cb {
-	union {
-		int	mac_offset;
-		int	data_offset;
-	};
-	int	encap_level;
-	__wsum	csum;
-	__u16	csum_start;
-};
-#define SKB_GSO_CB_OFFSET	32
-#define SKB_GSO_CB(skb) ((struct skb_gso_cb *)((skb)->cb + SKB_GSO_CB_OFFSET))
-
-static inline int skb_tnl_header_len(const struct sk_buff *inner_skb)
-{
-	return (skb_mac_header(inner_skb) - inner_skb->head) -
-		SKB_GSO_CB(inner_skb)->mac_offset;
-}
-
-static inline int gso_pskb_expand_head(struct sk_buff *skb, int extra)
-{
-	int new_headroom, headroom;
-	int ret;
-
-	headroom = skb_headroom(skb);
-	ret = pskb_expand_head(skb, extra, 0, GFP_ATOMIC);
-	if (ret)
-		return ret;
-
-	new_headroom = skb_headroom(skb);
-	SKB_GSO_CB(skb)->mac_offset += (new_headroom - headroom);
-	return 0;
-}
-
-static inline void gso_reset_checksum(struct sk_buff *skb, __wsum res)
-{
-	/* Do not update partial checksums if remote checksum is enabled. */
-	if (skb->remcsum_offload)
-		return;
-
-	SKB_GSO_CB(skb)->csum = res;
-	SKB_GSO_CB(skb)->csum_start = skb_checksum_start(skb) - skb->head;
-}
-
-/* Compute the checksum for a gso segment. First compute the checksum value
- * from the start of transport header to SKB_GSO_CB(skb)->csum_start, and
- * then add in skb->csum (checksum from csum_start to end of packet).
- * skb->csum and csum_start are then updated to reflect the checksum of the
- * resultant packet starting from the transport header-- the resultant checksum
- * is in the res argument (i.e. normally zero or ~ of checksum of a pseudo
- * header.
- */
-static inline __sum16 gso_make_checksum(struct sk_buff *skb, __wsum res)
-{
-	unsigned char *csum_start = skb_transport_header(skb);
-	int plen = (skb->head + SKB_GSO_CB(skb)->csum_start) - csum_start;
-	__wsum partial = SKB_GSO_CB(skb)->csum;
-
-	SKB_GSO_CB(skb)->csum = res;
-	SKB_GSO_CB(skb)->csum_start = csum_start - skb->head;
-
-	return csum_fold(csum_partial(csum_start, plen, partial));
-}
-
 static inline bool skb_is_gso(const struct sk_buff *skb)
 {
 	return skb_shinfo(skb)->gso_size;
diff --git a/include/net/gro.h b/include/net/gro.h
index 7b47dd6ce94f..75efa6fb8441 100644
--- a/include/net/gro.h
+++ b/include/net/gro.h
@@ -452,5 +452,6 @@ static inline void gro_normal_one(struct napi_struct *napi, struct sk_buff *skb,
 		gro_normal_list(napi);
 }
 
+extern struct list_head offload_base;
 
 #endif /* _NET_IPV6_GRO_H */
diff --git a/include/net/gso.h b/include/net/gso.h
new file mode 100644
index 000000000000..29975440cad5
--- /dev/null
+++ b/include/net/gso.h
@@ -0,0 +1,109 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+
+#ifndef _NET_GSO_H
+#define _NET_GSO_H
+
+#include <linux/skbuff.h>
+
+/* Keeps track of mac header offset relative to skb->head.
+ * It is useful for TSO of Tunneling protocol. e.g. GRE.
+ * For non-tunnel skb it points to skb_mac_header() and for
+ * tunnel skb it points to outer mac header.
+ * Keeps track of level of encapsulation of network headers.
+ */
+struct skb_gso_cb {
+	union {
+		int	mac_offset;
+		int	data_offset;
+	};
+	int	encap_level;
+	__wsum	csum;
+	__u16	csum_start;
+};
+#define SKB_GSO_CB_OFFSET	32
+#define SKB_GSO_CB(skb) ((struct skb_gso_cb *)((skb)->cb + SKB_GSO_CB_OFFSET))
+
+static inline int skb_tnl_header_len(const struct sk_buff *inner_skb)
+{
+	return (skb_mac_header(inner_skb) - inner_skb->head) -
+		SKB_GSO_CB(inner_skb)->mac_offset;
+}
+
+static inline int gso_pskb_expand_head(struct sk_buff *skb, int extra)
+{
+	int new_headroom, headroom;
+	int ret;
+
+	headroom = skb_headroom(skb);
+	ret = pskb_expand_head(skb, extra, 0, GFP_ATOMIC);
+	if (ret)
+		return ret;
+
+	new_headroom = skb_headroom(skb);
+	SKB_GSO_CB(skb)->mac_offset += (new_headroom - headroom);
+	return 0;
+}
+
+static inline void gso_reset_checksum(struct sk_buff *skb, __wsum res)
+{
+	/* Do not update partial checksums if remote checksum is enabled. */
+	if (skb->remcsum_offload)
+		return;
+
+	SKB_GSO_CB(skb)->csum = res;
+	SKB_GSO_CB(skb)->csum_start = skb_checksum_start(skb) - skb->head;
+}
+
+/* Compute the checksum for a gso segment. First compute the checksum value
+ * from the start of transport header to SKB_GSO_CB(skb)->csum_start, and
+ * then add in skb->csum (checksum from csum_start to end of packet).
+ * skb->csum and csum_start are then updated to reflect the checksum of the
+ * resultant packet starting from the transport header-- the resultant checksum
+ * is in the res argument (i.e. normally zero or ~ of checksum of a pseudo
+ * header.
+ */
+static inline __sum16 gso_make_checksum(struct sk_buff *skb, __wsum res)
+{
+	unsigned char *csum_start = skb_transport_header(skb);
+	int plen = (skb->head + SKB_GSO_CB(skb)->csum_start) - csum_start;
+	__wsum partial = SKB_GSO_CB(skb)->csum;
+
+	SKB_GSO_CB(skb)->csum = res;
+	SKB_GSO_CB(skb)->csum_start = csum_start - skb->head;
+
+	return csum_fold(csum_partial(csum_start, plen, partial));
+}
+
+struct sk_buff *__skb_gso_segment(struct sk_buff *skb,
+				  netdev_features_t features, bool tx_path);
+
+static inline struct sk_buff *skb_gso_segment(struct sk_buff *skb,
+					      netdev_features_t features)
+{
+	return __skb_gso_segment(skb, features, true);
+}
+
+struct sk_buff *skb_eth_gso_segment(struct sk_buff *skb,
+				    netdev_features_t features, __be16 type);
+
+struct sk_buff *skb_mac_gso_segment(struct sk_buff *skb,
+				    netdev_features_t features);
+
+bool skb_gso_validate_network_len(const struct sk_buff *skb, unsigned int mtu);
+
+bool skb_gso_validate_mac_len(const struct sk_buff *skb, unsigned int len);
+
+static inline void skb_gso_error_unwind(struct sk_buff *skb, __be16 protocol,
+					int pulled_hlen, u16 mac_offset,
+					int mac_len)
+{
+	skb->protocol = protocol;
+	skb->encapsulation = 1;
+	skb_push(skb, pulled_hlen);
+	skb_reset_transport_header(skb);
+	skb->mac_header = mac_offset;
+	skb->network_header = skb->mac_header + mac_len;
+	skb->mac_len = mac_len;
+}
+
+#endif /* _NET_GSO_H */
diff --git a/include/net/udp.h b/include/net/udp.h
index 4ed0b47c5582..e01340a27155 100644
--- a/include/net/udp.h
+++ b/include/net/udp.h
@@ -21,6 +21,7 @@
 #include <linux/list.h>
 #include <linux/bug.h>
 #include <net/inet_sock.h>
+#include <net/gso.h>
 #include <net/sock.h>
 #include <net/snmp.h>
 #include <net/ip.h>