[PATCH 3/3] backport-include: deal with struct sock::sk_pacing_shift

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In kernel 4.15 the field sk_pacing_shift was introduced to allow
(wifi) drivers to change the behaviour of TSQ. In 4.16 a helper
function was added which mac80211 is using. So backport the helper
which is just a stub for kernels prior to 4.15.

Cc: Eric Dumazet <edumazet@xxxxxxxxxx>
Signed-off-by: Arend van Spriel <arend.vanspriel@xxxxxxxxxxxx>
As noted in the commit message this patch makes the helper function
an empty stub for kernels prior to 4.15, which introduced the field
sk_pacing_shift. Maybe it would be possible to accomplish similar
thing by modifying struct sk_buff::true_size, but I am not too familiar
with TSQ so I did not go there.

 backport/backport-include/net/sock.h | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/backport/backport-include/net/sock.h b/backport/backport-include/net/sock.h
index 89191f3..39bf008 100644
--- a/backport/backport-include/net/sock.h
+++ b/backport/backport-include/net/sock.h
@@ -63,4 +63,16 @@ static inline void sk_clear_bit(int nr, struct sock *sk)
 #endif /* < 4.5 */
+#define sk_pacing_shift_update LINUX_BACKPORT(sk_pacing_shift_update)
+static inline void sk_pacing_shift_update(struct sock *sk, int val)
+	if (!sk || !sk_fullsock(sk) || sk->sk_pacing_shift == val)
+		return;
+	sk->sk_pacing_shift = val;
+#endif /* >= 4.15 */
+#endif /* < 4.16 */
 #endif /* __BACKPORT_NET_SOCK_H */

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