net: tso: inline tso_count_descs()

tso_count_descs() is a small function doing simple calculation,
and tso_count_descs() is used in fast path, so inline it to
reduce the overhead of calls.

Signed-off-by: Yunsheng Lin <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Jakub Kicinski <[email protected]>

Author: Yunsheng Lin

include/net/tso.h

@@ -2,6 +2,7 @@
 #ifndef _TSO_H
 #define _TSO_H
 
+#include <linux/skbuff.h>
 #include <net/ip.h>
 
 #define TSO_HEADER_SIZE		256
@@ -16,7 +17,12 @@ struct tso_t {
 	u32	tcp_seq;
 };
 
-int tso_count_descs(const struct sk_buff *skb);
+/* Calculate the worst case buffer count */
+static inline int tso_count_descs(const struct sk_buff *skb)
+{
+	return skb_shinfo(skb)->gso_segs * 2 + skb_shinfo(skb)->nr_frags;
+}
+
 void tso_build_hdr(const struct sk_buff *skb, char *hdr, struct tso_t *tso,
 		   int size, bool is_last);
 void tso_build_data(const struct sk_buff *skb, struct tso_t *tso, int size);

net/core/tso.c

@@ -5,14 +5,6 @@
 #include <net/tso.h>
 #include <asm/unaligned.h>
 
-/* Calculate expected number of TX descriptors */
-int tso_count_descs(const struct sk_buff *skb)
-{
-	/* The Marvell Way */
-	return skb_shinfo(skb)->gso_segs * 2 + skb_shinfo(skb)->nr_frags;
-}
-EXPORT_SYMBOL(tso_count_descs);
-
 void tso_build_hdr(const struct sk_buff *skb, char *hdr, struct tso_t *tso,
 		   int size, bool is_last)
 {