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iproute2: cake: support new operating modes

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There has been recent significant activity with the cake qdisc of late
Some of that effort is related to upstreaming to kernel & iproute2
mainline but we're not quite there yet.  This commit teaches tc how to
activate and interprete the latest cake operating modes, namely:

ingress mode: Instead of only counting packets that make it past the
shaper, include packets we've decided to drop as well, since they did
arrive with us on the link and took link capacity.
This mode is more suitable for shaping the ingress of a link
(e.g. from ISP) rather than the more normal egress.

ack-filter/ack-filter-aggressive: Filter excessive TCP ACKS.  Useful in
highly assymetric links (downstream v upstream capacity) where the
majority of upstream link capacity is occupied with ACKS for downstream
traffic.

Signed-off-by: Kevin Darbyshire-Bryant <ldir@darbyshire-bryant.me.uk>
This commit is contained in:
Kevin Darbyshire-Bryant 2017-12-15 16:19:22 +00:00 committed by John Crispin
parent 0589979f7b
commit a9940ca2d7
2 changed files with 129 additions and 50 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
package/network/utils/iproute2/Makefile
View File

@ -9,7 +9,7 @@ include $(TOPDIR)/rules.mk
PKG_NAME:=iproute2
PKG_VERSION:=4.14.1
PKG_RELEASE:=1
PKG_RELEASE:=2
PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.xz
PKG_SOURCE_URL:=@KERNEL/linux/utils/net/iproute2

97
package/network/utils/iproute2/patches/950-add-cake-to-tc.patch
View File

@ -76,7 +76,7 @@
TCMODULES += e_bpf.o
--- /dev/null
+++ b/tc/q_cake.c
@@ -0,0 +1,692 @@
@@ -0,0 +1,771 @@
+/*
+ * Common Applications Kept Enhanced -- CAKE
+ *
@ -140,9 +140,10 @@
+" dual-srchost | dual-dsthost | triple-isolate* ]\n"
+" [ nat | nonat* ]\n"
+" [ wash | nowash * ]\n"
+" [ ack-filter | ack-filter-aggressive | no-ack-filter * ]\n"
+" [ memlimit LIMIT ]\n"
+" [ ptm | atm | noatm* ] [ overhead N | conservative | raw* ]\n"
+" [ mpu N ]\n"
+" [ mpu N ] [ ingress | egress* ]\n"
+" (* marks defaults)\n");
+}
+
@ -158,12 +159,14 @@
+ int overhead = 0;
+ bool overhead_set = false;
+ bool overhead_override = false;
+ int wash = -1;
+ int mpu = 0;
+ int flowmode = -1;
+ int nat = -1;
+ int atm = -1;
+ int autorate = -1;
+ int wash = -1;
+ int ingress = -1;
+ int ack_filter = -1;
+ struct rtattr *tail;
+
+ while (argc > 0) {
@ -317,12 +320,22 @@
+ /* Typical VDSL2 framing schemes, both over PTM */
+ /* PTM has 64b/65b coding which absorbs some bandwidth */
+ } else if (strcmp(*argv, "pppoe-ptm") == 0) {
+ /* 2B PPP + 6B PPPoE + 6B dest MAC + 6B src MAC
+ * + 2B ethertype + 4B Frame Check Sequence
+ * + 1B Start of Frame (S) + 1B End of Frame (Ck)
+ * + 2B TC-CRC (PTM-FCS) = 30B
+ */
+ atm = 2;
+ overhead += 27;
+ overhead += 30;
+ overhead_set = true;
+ } else if (strcmp(*argv, "bridged-ptm") == 0) {
+ /* 6B dest MAC + 6B src MAC + 2B ethertype
+ * + 4B Frame Check Sequence
+ * + 1B Start of Frame (S) + 1B End of Frame (Ck)
+ * + 2B TC-CRC (PTM-FCS) = 22B
+ */
+ atm = 2;
+ overhead += 19;
+ overhead += 22;
+ overhead_set = true;
+
+ } else if (strcmp(*argv, "via-ethernet") == 0) {
@ -335,9 +348,27 @@
+ * that automatically, and is thus ignored.
+ *
+ * It would be deleted entirely, but it appears in the
+ * stats output when the automatic compensation is active.
+ * stats output when the automatic compensation is
+ * active.
+ */
+
+ } else if (strcmp(*argv, "total_overhead") == 0) {
+ /*
+ * This is the overhead cake accounts for; added here so
+ * that cake's "tc -s qdisc" output can be directly
+ * pasted into the tc command to instantate a new cake..
+ */
+ NEXT_ARG();
+
+ } else if (strcmp(*argv, "hard_header_len") == 0) {
+ /*
+ * This is the overhead the kernel automatically
+ * accounted for; added here so that cake's "tc -s
+ * qdisc" output can be directly pasted into the tc
+ * command to instantiate a new cake..
+ */
+ NEXT_ARG();
+
+ } else if (strcmp(*argv, "ethernet") == 0) {
+ /* ethernet pre-amble & interframe gap & FCS
+ * you may need to add vlan tag */
@ -353,7 +384,7 @@
+
+ /*
+ * DOCSIS cable shapers account for Ethernet frame with FCS,
+ * but not interframe gap nor preamble.
+ * but not interframe gap or preamble.
+ */
+ } else if (strcmp(*argv, "docsis") == 0) {
+ atm = 0;
@ -380,6 +411,18 @@
+ return -1;
+ }
+
+ } else if (strcmp(*argv, "ingress") == 0) {
+ ingress = 1;
+ } else if (strcmp(*argv, "egress") == 0) {
+ ingress = 0;
+
+ } else if (strcmp(*argv, "no-ack-filter") == 0) {
+ ack_filter = 0;
+ } else if (strcmp(*argv, "ack-filter") == 0) {
+ ack_filter = 0x0200;
+ } else if (strcmp(*argv, "ack-filter-aggressive") == 0) {
+ ack_filter = 0x0600;
+
+ } else if (strcmp(*argv, "memlimit") == 0) {
+ NEXT_ARG();
+ if(get_size(&memlimit, *argv)) {
@ -428,6 +471,10 @@
+ addattr_l(n, 1024, TCA_CAKE_NAT, &nat, sizeof(nat));
+ if (wash != -1)
+ addattr_l(n, 1024, TCA_CAKE_WASH, &wash, sizeof(wash));
+ if (ingress != -1)
+ addattr_l(n, 1024, TCA_CAKE_INGRESS, &ingress, sizeof(ingress));
+ if (ack_filter != -1)
+ addattr_l(n, 1024, TCA_CAKE_ACK_FILTER, &ack_filter, sizeof(ack_filter));
+
+ tail->rta_len = (void *) NLMSG_TAIL(n) - (void *) tail;
+ return 0;
@ -449,6 +496,8 @@
+ int nat = 0;
+ int autorate = 0;
+ int wash = 0;
+ int ingress = 0;
+ int ack_filter = 0;
+ SPRINT_BUF(b1);
+ SPRINT_BUF(b2);
+
@ -554,6 +603,14 @@
+ RTA_PAYLOAD(tb[TCA_CAKE_MPU]) >= sizeof(__u32)) {
+ mpu = rta_getattr_u32(tb[TCA_CAKE_MPU]);
+ }
+ if (tb[TCA_CAKE_INGRESS] &&
+ RTA_PAYLOAD(tb[TCA_CAKE_INGRESS]) >= sizeof(__u32)) {
+ ingress = rta_getattr_u32(tb[TCA_CAKE_INGRESS]);
+ }
+ if (tb[TCA_CAKE_ACK_FILTER] &&
+ RTA_PAYLOAD(tb[TCA_CAKE_ACK_FILTER]) >= sizeof(__u32)) {
+ ack_filter = rta_getattr_u32(tb[TCA_CAKE_ACK_FILTER]);
+ }
+ if (tb[TCA_CAKE_ETHERNET] &&
+ RTA_PAYLOAD(tb[TCA_CAKE_ETHERNET]) >= sizeof(__u32)) {
+ ethernet = rta_getattr_u32(tb[TCA_CAKE_ETHERNET]);
@ -566,6 +623,14 @@
+ if (wash)
+ fprintf(f,"wash ");
+
+ if (ingress)
+ fprintf(f,"ingress ");
+
+ if (ack_filter == 0x0600)
+ fprintf(f,"ack-filter-aggressive ");
+ else if (ack_filter)
+ fprintf(f,"ack-filter ");
+
+ if (interval)
+ fprintf(f, "rtt %s ", sprint_time(interval, b2));
+
@ -581,12 +646,19 @@
+
+ fprintf(f, "overhead %d ", overhead);
+
+ // This is actually the *amount* of automatic compensation, but we only report
+ // its presence as a boolean for now.
+ /* This is actually the *amount* of automatic compensation, but
+ * we only report its presence as a boolean for now.
+ */
+ if (ethernet)
+ fprintf(f, "via-ethernet ");
+ }
+
+ /* unconditionally report the overhead and hard_header_len overhead the
+ * kernel added automatically
+ */
+ fprintf(f, "total_overhead %d ", overhead);
+ fprintf(f, "hard_header_len %d ", ethernet);
+
+ if (mpu) {
+ fprintf(f, "mpu %d ", mpu);
+ }
@ -736,6 +808,13 @@
+ fprintf(f, " %12u", stnc->ecn_marked[i].packets);
+ fprintf(f, "\n");
+
+ if(stnc->version >= 5) {
+ fprintf(f, " ack_drop");
+ for(i=0; i < stnc->tin_cnt; i++)
+ fprintf(f, " %12u", stnc->ack_drops[i].packets);
+ fprintf(f, "\n");
+ }
+
+ fprintf(f, " sp_flows");
+ for(i=0; i < stnc->tin_cnt; i++)
+ fprintf(f, " %12u", stnc->sparse_flows[i]);