net: tso: constify tso_count_descs() and friends

skb argument of tso_count_descs(), tso_build_hdr() and tso_build_data() can be const.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/include/net/tso.h b/include/net/tso.h
index d9b0a14..32d9272 100644 (file)
--- a/include/net/tso.h
+++ b/include/net/tso.h
@@ -15,10 +15,10 @@ struct tso_t {
        u32     tcp_seq;
 };
 
-int tso_count_descs(struct sk_buff *skb);
-void tso_build_hdr(struct sk_buff *skb, char *hdr, struct tso_t *tso,
+int tso_count_descs(const struct sk_buff *skb);
+void tso_build_hdr(const struct sk_buff *skb, char *hdr, struct tso_t *tso,
                   int size, bool is_last);
-void tso_build_data(struct sk_buff *skb, struct tso_t *tso, int size);
+void tso_build_data(const struct sk_buff *skb, struct tso_t *tso, int size);
 void tso_start(struct sk_buff *skb, struct tso_t *tso);
 
 #endif /* _TSO_H */

diff --git a/net/core/tso.c b/net/core/tso.c
index d4d5c07..56487e3 100644 (file)
--- a/net/core/tso.c
+++ b/net/core/tso.c
@@ -6,14 +6,14 @@
 #include <asm/unaligned.h>
 
 /* Calculate expected number of TX descriptors */
-int tso_count_descs(struct sk_buff *skb)
+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(struct sk_buff *skb, char *hdr, struct tso_t *tso,
+void tso_build_hdr(const struct sk_buff *skb, char *hdr, struct tso_t *tso,
                   int size, bool is_last)
 {
        struct tcphdr *tcph;
@@ -44,7 +44,7 @@ void tso_build_hdr(struct sk_buff *skb, char *hdr, struct tso_t *tso,
 }
 EXPORT_SYMBOL(tso_build_hdr);
 
-void tso_build_data(struct sk_buff *skb, struct tso_t *tso, int size)
+void tso_build_data(const struct sk_buff *skb, struct tso_t *tso, int size)
 {
        tso->tcp_seq += size;
        tso->size -= size;