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Date: Tue, 27 Jun 2017 11:29:17 -0500
From: "McCabe, Robert J" <Robert.McCabe@...kwellcollins.com>
To: netdev@...r.kernel.org
Cc: robert.mccabe@...kwellcollins.com,
"McCabe, Robert J" <Robert.McCabe@...kwellcollins.com>,
McCabe@...kwellcollins.com
Subject: [PATCH 1/1] tc: custom qdisc pkt size translation table
Added the "custom" linklayer qdisc stab option.
This allows the user to specify the pkt size translation
parameters from stdin.
Example:
tc qdisc add ... stab tsize 8 linklayer custom htb
Custom size table:
InputSizeStart -> IntputSizeEnd: Output Pkt Size
0 - 255: 400
256 - 511: 800
512 - 767: 1200
768 - 1023: 1600
1024 - 1279: 2000
1280 - 1535: 2400
1536 - 1791: 2800
1792 - 2047: 3200
Signed-off-by: McCabe, Robert J <Robert.McCabe@...kwellcollins.com>
---
include/linux/pkt_sched.h | 1 +
tc/tc_core.c | 51 +++++++++++++++++++++++++++++++++++++++++++++++
tc/tc_core.h | 2 +-
tc/tc_stab.c | 4 +++-
tc/tc_util.c | 5 +++++
5 files changed, 61 insertions(+), 2 deletions(-)
diff --git a/include/linux/pkt_sched.h b/include/linux/pkt_sched.h
index 099bf55..289bb81 100644
--- a/include/linux/pkt_sched.h
+++ b/include/linux/pkt_sched.h
@@ -82,6 +82,7 @@ enum tc_link_layer {
TC_LINKLAYER_UNAWARE, /* Indicate unaware old iproute2 util */
TC_LINKLAYER_ETHERNET,
TC_LINKLAYER_ATM,
+ TC_LINKLAYER_CUSTOM,
};
#define TC_LINKLAYER_MASK 0x0F /* limit use to lower 4 bits */
diff --git a/tc/tc_core.c b/tc/tc_core.c
index 821b741..fb04704 100644
--- a/tc/tc_core.c
+++ b/tc/tc_core.c
@@ -21,6 +21,7 @@
#include <netinet/in.h>
#include <arpa/inet.h>
#include <string.h>
+#include <assert.h>
#include "tc_core.h"
#include <linux/atm.h>
@@ -28,6 +29,16 @@
static double tick_in_usec = 1;
static double clock_factor = 1;
+struct size_table_entry {
+ unsigned int input_size_boundary_start;
+ unsigned int output_size_bytes;
+};
+
+//TODO: free
+static struct size_table_entry* custom_size_table = NULL;
+static int num_size_table_entries = 0;
+
+
int tc_core_time2big(unsigned int time)
{
__u64 t = time;
@@ -89,6 +100,23 @@ static unsigned int tc_align_to_atm(unsigned int size)
return linksize;
}
+static unsigned int tc_align_to_custom(unsigned int size)
+{
+ int i;
+
+ assert(custom_size_table != NULL);
+
+ for(i = num_size_table_entries -1; i >= 0 ; --i)
+ {
+ if(custom_size_table[i].input_size_boundary_start < size)
+ {
+ /* found it */
+ return custom_size_table[i].output_size_bytes;
+ }
+ }
+ return 0;
+}
+
static unsigned int tc_adjust_size(unsigned int sz, unsigned int mpu, enum link_layer linklayer)
{
if (sz < mpu)
@@ -97,6 +125,8 @@ static unsigned int tc_adjust_size(unsigned int sz, unsigned int mpu, enum link_
switch (linklayer) {
case LINKLAYER_ATM:
return tc_align_to_atm(sz);
+ case LINKLAYER_CUSTOM:
+ return tc_align_to_custom(sz);
case LINKLAYER_ETHERNET:
default:
/* No size adjustments on Ethernet */
@@ -185,6 +215,27 @@ int tc_calc_size_table(struct tc_sizespec *s, __u16 **stab)
if (!*stab)
return -1;
+ if(LINKLAYER_CUSTOM == linklayer)
+ {
+ custom_size_table = malloc(sizeof(struct size_table_entry)* s->tsize);
+ if(!custom_size_table)
+ return -1;
+ num_size_table_entries = s->tsize;
+
+ printf("Custom size table:\n");
+ printf("InputSizeStart -> IntputSizeEnd : Output Pkt Size\n");
+ for(i = 0; i <= s->tsize - 1; ++i)
+ {
+ printf("%d - %d: ", i << s->cell_log, ((i+1) << s->cell_log) - 1);
+ if(!scanf("%u", &custom_size_table[i].output_size_bytes))
+ {
+ fprintf(stderr, "Invalid custom stab table entry!\n");
+ return -1;
+ }
+
+ custom_size_table[i].input_size_boundary_start = i << s->cell_log;
+ }
+ }
again:
for (i = s->tsize - 1; i >= 0; i--) {
sz = tc_adjust_size((i + 1) << s->cell_log, s->mpu, linklayer);
diff --git a/tc/tc_core.h b/tc/tc_core.h
index 8a63b79..8e97222 100644
--- a/tc/tc_core.h
+++ b/tc/tc_core.h
@@ -10,9 +10,9 @@ enum link_layer {
LINKLAYER_UNSPEC,
LINKLAYER_ETHERNET,
LINKLAYER_ATM,
+ LINKLAYER_CUSTOM,
};
-
int tc_core_time2big(unsigned time);
unsigned tc_core_time2tick(unsigned time);
unsigned tc_core_tick2time(unsigned tick);
diff --git a/tc/tc_stab.c b/tc/tc_stab.c
index 1a0a3e3..8374c76 100644
--- a/tc/tc_stab.c
+++ b/tc/tc_stab.c
@@ -37,7 +37,9 @@ static void stab_help(void)
" tsize : how many slots should size table have {512}\n"
" mpu : minimum packet size used in rate computations\n"
" overhead : per-packet size overhead used in rate computations\n"
- " linklayer : adapting to a linklayer e.g. atm\n"
+ " linklayer : adapting to a linklayer e.g. ethernet, atm or custom\n"
+ " a \"custom\" linklayer reads size table entries from\n"
+ " stdin\n"
"Example: ... stab overhead 20 linklayer atm\n");
}
diff --git a/tc/tc_util.c b/tc/tc_util.c
index 24ca1f1..3ee1098 100644
--- a/tc/tc_util.c
+++ b/tc/tc_util.c
@@ -485,6 +485,8 @@ int get_linklayer(unsigned int *val, const char *arg)
res = LINKLAYER_ATM;
else if (matches(arg, "adsl") == 0)
res = LINKLAYER_ATM;
+ else if (matches(arg, "custom") == 0)
+ res = LINKLAYER_CUSTOM;
else
return -1; /* Indicate error */
@@ -504,6 +506,9 @@ void print_linklayer(char *buf, int len, unsigned int linklayer)
case LINKLAYER_ATM:
snprintf(buf, len, "%s", "atm");
return;
+ case LINKLAYER_CUSTOM:
+ snprintf(buf, len, "%s", "custom");
+ return;
default:
snprintf(buf, len, "%s", "unknown");
return;
--
2.7.4
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