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White Rabbit Switch - Software
Commit 96f442db authored by Grzegorz Daniluk's avatar Grzegorz Daniluk Committed by Adam Wujek
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userspace: adding wrs_throttling tool to configure Rx b/w throttling in NIC HDL

parent e24fbdd1
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userspace/include/fpga_io.h
View file @ 96f442db
......@@ -38,6 +38,9 @@
/* Endpoint */
#define FPGA_BASE_EP0 0x30000
/* NIC */
#define FPGA_BASE_NIC 0x20000
extern volatile uint8_t *_fpga_base_virt; /* libwr/fpga_io.c */
#define FPGA_BASE_ADDR _fpga_base_virt
......
userspace/tools/.gitignore
View file @ 96f442db
......@@ -24,3 +24,4 @@ mkpasswd
wrs_status_led
wrs_sfp_dump
wrs_pps_control
wrs_throttling
userspace/tools/Makefile
View file @ 96f442db
......@@ -9,6 +9,7 @@ TOOLS += wrs_checkcfg
TOOLS += wrs_status_led
TOOLS += mkpasswd
TOOLS += wrs_sfp_dump
TOOLS += wrs_throttling
PPSI_CONFIG = ../ppsi/include/generated/autoconf.h
WR_INSTALL_ROOT ?= /usr/lib/white-rabbit
......
userspace/tools/wrs_throttling.c 0 → 100644
View file @ 96f442db
/*
* Copyright (c) 2016, CERN
*
* Author: Grzegorz Daniluk <grzegorz.daniluk@cern.ch>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
#include <stdio.h>
#include <getopt.h>
#include <inttypes.h>
#include <stddef.h>
#include <unistd.h>
#include <stdlib.h>
#include <sys/stat.h>
#include <libwr/switch_hw.h>
#include <libwr/wrs-msg.h>
#include <fpga_io.h>
#include <regs/nic-regs.h>
#define nic_write(reg, val) \
_fpga_writel(FPGA_BASE_NIC + offsetof(struct NIC_WB, reg), val)
#define nic_read(reg) \
_fpga_readl(FPGA_BASE_NIC + offsetof(struct NIC_WB, reg))
#define MAX_THR 65535 /* b/w thr in HDL is 16-bit value in KB/s */
#define MIN_THR 2
static char *prgname;
void enable_throttling(int en)
{
uint32_t val;
val = nic_read(CR);
if (en) {
val |= NIC_CR_RXTHR_EN;
printf("NIC bandwidth throttling enabled\n");
} else {
val &= (~NIC_CR_RXTHR_EN);
printf("NIC bandwidth throttling disabled\n");
}
nic_write(CR, val);
}
void print_bw(int print_bps)
{
uint32_t bw;
/* first we read the b/w in Bytes/s */
bw = nic_read(RXBW);
if (print_bps)
printf("NIC Rx bandwidth: %u B/s\n", bw);
else
printf("NIC Rx bandwidth: %.3f KB/s\n", bw/1024.0);
}
int set_thr(unsigned thr)
{
if (thr > MAX_THR || thr < MIN_THR)
return -1;
printf("Setting NIC Rx bandwidth threshold: %u KB/s\n", thr);
nic_write(MAXRXBW, thr);
return 0;
}
void print_settings(void)
{
uint32_t en;
en = nic_read(CR) & NIC_CR_RXTHR_EN;
printf("Current settings:\n");
printf("Throttling: %s\n", en ? "enabled" : "disabled");
printf("Max bandwidth: %u KB/s\n", nic_read(MAXRXBW));
}
void print_help(char *prgname)
{
printf("wrs_throttling. Commit %s, built on " __DATE__ "\n",
__GIT_VER__);
printf("usage: %s <options>\n", prgname);
printf(" -h Show this help message\n"
" -b Print current b/w in B/s (KB/s by default)\n"
" -l Endless loop mode. Prints the current b/w "
"every 1 s\n"
" -t <KB/s> Set maximum NIC Rx bandwidth to <KB/s>\n"
" -d Disable b/w throttling in NIC\n"
" -s Print current settings of the throttling\n");
}
int main(int argc, char *argv[])
{
int c = 0;
int print_bps = 0; /* print current b/w in Bytes/s */
int loop_mode = 0; /* prints current b/w every 1s */
prgname = argv[0];
wrs_msg_init(argc, argv);
if (shw_fpga_mmap_init() < 0) {
pr_error("%s: Can't access device memory\n", prgname);
exit(1);
}
while ((c = getopt(argc, argv, "hbt:lds")) != -1) {
switch (c) {
case 'b':
/* print current b/w in B/s */
print_bps = 1;
break;
case 't':
/* set b/w threshold */
if (set_thr(atoi(optarg)) != -1) {
enable_throttling(1);
} else {
pr_error("Threshold outside allowed range "
"<%d; %d>\n", MIN_THR, MAX_THR);
}
break;
case 'd':
/* disable b/w throttling */
enable_throttling(0);
break;
case 'l':
loop_mode = 1;
break;
case 's':
print_settings();
break;
case 'h':
default:
print_help(prgname);
exit(1);
}
}
/* do actual printing */
print_bw(print_bps);
while (loop_mode) {
sleep(1);
print_bw(print_bps);
}
return 0;
}
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