iproute2: cake: add 'mpu' minimum packet length support

Add 'mpu' minimum length packet size parameter for scheduling/bandwidth
accounting.

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

package/network/utils/iproute2/Makefile

@@ -9,7 +9,7 @@ include $(TOPDIR)/rules.mk
 
 PKG_NAME:=iproute2
 PKG_VERSION:=4.4.0
-PKG_RELEASE:=6
+PKG_RELEASE:=7
 
 PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.xz
 PKG_SOURCE_URL:=@KERNEL/linux/utils/net/iproute2

package/network/utils/iproute2/patches/950-add-cake-to-tc.patch

@@ -1,6 +1,6 @@
 --- a/include/linux/pkt_sched.h
 +++ b/include/linux/pkt_sched.h
-@@ -850,4 +850,59 @@ struct tc_pie_xstats {
+@@ -850,4 +850,60 @@ struct tc_pie_xstats {
  	__u32 maxq;             /* maximum queue size */
  	__u32 ecn_mark;         /* packets marked with ecn*/
  };
@@ -13,6 +13,7 @@
 +	TCA_CAKE_ATM,
 +	TCA_CAKE_FLOW_MODE,
 +	TCA_CAKE_OVERHEAD,
++	TCA_CAKE_MPU,
 +	TCA_CAKE_RTT,
 +	TCA_CAKE_TARGET,
 +	TCA_CAKE_AUTORATE,
@@ -72,7 +73,7 @@
  
 --- /dev/null
 +++ b/tc/q_cake.c
-@@ -0,0 +1,663 @@
+@@ -0,0 +1,686 @@
 +/*
 + * Common Applications Kept Enhanced  --  CAKE
 + *
@@ -130,7 +131,7 @@
 +	                "                [ rtt TIME | datacentre | lan | metro | regional | internet* | oceanic | satellite | interplanetary ]\n"
 +	                "                [ besteffort | precedence | diffserv8 | diffserv4 | diffserv-llt | diffserv3* ]\n"
 +	                "                [ flowblind | srchost | dsthost | hosts | flows | dual-srchost | dual-dsthost | triple-isolate* ] [ nat | nonat* ]\n"
-+	                "                [ ptm | atm | noatm* ] [ overhead N | conservative | raw* ]\n"
++	                "                [ ptm | atm | noatm* ] [ overhead N | conservative | raw* ] [ mpu N ]\n"
 +	                "                [ wash | nowash* ]\n"
 +	                "                [ memlimit LIMIT ]\n"
 +	                "    (* marks defaults)\n");
@@ -149,6 +150,7 @@
 +	bool overhead_set = false;
 +	bool overhead_override = false;
 +	int wash = -1;
++	int mpu = 0;
 +	int flowmode = -1;
 +	int nat = -1;
 +	int atm = -1;
@@ -332,6 +334,7 @@
 +			 * you may need to add vlan tag */
 +			overhead += 38;
 +			overhead_set = true;
++			mpu = 84;
 +
 +		/* Additional Ethernet-related overhead used by some ISPs */
 +		} else if (strcmp(*argv, "ether-vlan") == 0) {
@@ -347,6 +350,7 @@
 +			atm = 0;
 +			overhead += 18;
 +			overhead_set = true;
++			mpu = 64;
 +
 +		} else if (strcmp(*argv, "overhead") == 0) {
 +			char* p = NULL;
@@ -358,6 +362,15 @@
 +			}
 +			overhead_set = true;
 +
++		} else if (strcmp(*argv, "mpu") == 0) {
++			char* p = NULL;
++			NEXT_ARG();
++			mpu = strtol(*argv, &p, 10);
++			if(!p || *p || !*argv || mpu < 0 || mpu > 256) {
++				fprintf(stderr, "Illegal \"mpu\", valid range is 0 to 256\\n");
++				return -1;
++			}
++
 +		} else if (strcmp(*argv, "memlimit") == 0) {
 +			NEXT_ARG();
 +			if(get_size(&memlimit, *argv)) {
@@ -392,6 +405,8 @@
 +		unsigned zero = 0;
 +		addattr_l(n, 1024, TCA_CAKE_ETHERNET, &zero, sizeof(zero));
 +	}
++	if (mpu > 0)
++		addattr_l(n, 1024, TCA_CAKE_MPU, &mpu, sizeof(mpu));
 +	if (interval)
 +		addattr_l(n, 1024, TCA_CAKE_RTT, &interval, sizeof(interval));
 +	if (target)
@@ -420,6 +435,7 @@
 +	unsigned memlimit = 0;
 +	int overhead = 0;
 +	int ethernet = 0;
++	int mpu = 0;
 +	int atm = 0;
 +	int nat = 0;
 +	int autorate = 0;
@@ -525,6 +541,10 @@
 +	    RTA_PAYLOAD(tb[TCA_CAKE_OVERHEAD]) >= sizeof(__u32)) {
 +		overhead = rta_getattr_u32(tb[TCA_CAKE_OVERHEAD]);
 +	}
++	if (tb[TCA_CAKE_MPU] &&
++	    RTA_PAYLOAD(tb[TCA_CAKE_MPU]) >= sizeof(__u32)) {
++		mpu = rta_getattr_u32(tb[TCA_CAKE_MPU]);
++	}
 +	if (tb[TCA_CAKE_ETHERNET] &&
 +	    RTA_PAYLOAD(tb[TCA_CAKE_ETHERNET]) >= sizeof(__u32)) {
 +		ethernet = rta_getattr_u32(tb[TCA_CAKE_ETHERNET]);
@@ -558,6 +578,10 @@
 +			fprintf(f, "via-ethernet ");
 +	}
 +
++	if (mpu) {
++		fprintf(f, "mpu %d ", mpu);
++	}
++
 +	if (memlimit)
 +		fprintf(f, "memlimit %s", sprint_size(memlimit, b1));
 +