kmod-sched-cake: don't gso fixup on fixed kernels

Kernels 4.14.73 & 4.9.140 include the gso fixup fix, so cake
doesn't need to do it.  Let's not waste cpu cycles by doing it in
cake which could be really important on cpu constrained devices.

Signed-off-by: Kevin Darbyshire-Bryant <ldir@darbyshire-bryant.me.uk>

package/kernel/kmod-sched-cake/Makefile

@@ -9,7 +9,7 @@ include $(TOPDIR)/rules.mk
 include $(INCLUDE_DIR)/kernel.mk
 
 PKG_NAME:=sched-cake
-PKG_RELEASE:=1
+PKG_RELEASE:=2
 
 PKG_SOURCE_PROTO:=git
 PKG_SOURCE_URL:=https://github.com/dtaht/sch_cake.git

package/kernel/kmod-sched-cake/patches/100-remove-skb-max-fix-on-fixed-kernels.patch

@@ -0,0 +1,22 @@
+--- a/sch_cake.c
++++ b/sch_cake.c
+@@ -1799,13 +1799,18 @@ static s32 cake_enqueue(struct sk_buff *
+ 			cobalt_set_enqueue_time(segs, now);
+ 			get_cobalt_cb(segs)->adjusted_len = cake_overhead(q,
+ 									  segs);
+-
++#if !((LINUX_VERSION_CODE >= KERNEL_VERSION(3, 18, 124) && LINUX_VERSION_CODE < KERNEL_VERSION(3, 19, 0)) || \
++      (LINUX_VERSION_CODE >= KERNEL_VERSION(4,  4, 159) && LINUX_VERSION_CODE < KERNEL_VERSION(4,  5, 0)) || \
++      (LINUX_VERSION_CODE >= KERNEL_VERSION(4,  9, 130) && LINUX_VERSION_CODE < KERNEL_VERSION(4, 10, 0)) || \
++      (LINUX_VERSION_CODE >= KERNEL_VERSION(4, 14,  73) && LINUX_VERSION_CODE < KERNEL_VERSION(4, 15, 0)) || \
++      (LINUX_VERSION_CODE >= KERNEL_VERSION(4, 18,  11)))
+ 			/* For encapsulated packets, the mac_len may not be set
+ 			 * correctly after GSO split. Fix this by resetting it;
+ 			 * if skb_gso_segment() already does this correctly,
+ 			 * this is will just recalculate the current value.
+ 			 */
+ 			skb_reset_mac_len(skb);
++#endif
+ 
+ 			flow_queue_add(flow, segs);
+