[mirror_ubuntu-hirsute-kernel.git] / samples / bpf / hbm.c

// SPDX-License-Identifier: GPL-2.0
/* Copyright (c) 2019 Facebook
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of version 2 of the GNU General Public
 * License as published by the Free Software Foundation.
 *
 * Example program for Host Bandwidth Managment
 *
 * This program loads a cgroup skb BPF program to enforce cgroup output
 * (egress) or input (ingress) bandwidth limits.
 *
 * USAGE: hbm [-d] [-l] [-n <id>] [-r <rate>] [-s] [-t <secs>] [-w] [-h] [prog]
 *   Where:
 *    -d	Print BPF trace debug buffer
 *    -l	Also limit flows doing loopback
 *    -n <#>	To create cgroup \"/hbm#\" and attach prog
 *		Default is /hbm1
 *    --no_cn   Do not return cn notifications
 *    -r <rate>	Rate limit in Mbps
 *    -s	Get HBM stats (marked, dropped, etc.)
 *    -t <time>	Exit after specified seconds (default is 0)
 *    -w	Work conserving flag. cgroup can increase its bandwidth
 *		beyond the rate limit specified while there is available
 *		bandwidth. Current implementation assumes there is only
 *		NIC (eth0), but can be extended to support multiple NICs.
 *		Currrently only supported for egress.
 *    -h	Print this info
 *    prog	BPF program file name. Name defaults to hbm_out_kern.o
 */

#define _GNU_SOURCE

#include <stdio.h>
#include <stdlib.h>
#include <assert.h>
#include <sys/resource.h>
#include <sys/time.h>
#include <unistd.h>
#include <errno.h>
#include <fcntl.h>
#include <linux/unistd.h>
#include <linux/compiler.h>

#include <linux/bpf.h>
#include <bpf/bpf.h>
#include <getopt.h>

#include "bpf_rlimit.h"
#include "cgroup_helpers.h"
#include "hbm.h"
#include "bpf_util.h"
#include <bpf/libbpf.h>

bool outFlag = true;
int minRate = 1000;		/* cgroup rate limit in Mbps */
int rate = 1000;		/* can grow if rate conserving is enabled */
int dur = 1;
bool stats_flag;
bool loopback_flag;
bool debugFlag;
bool work_conserving_flag;
bool no_cn_flag;
bool edt_flag;

static void Usage(void);
static void read_trace_pipe2(void);
static void do_error(char *msg, bool errno_flag);

#define DEBUGFS "/sys/kernel/debug/tracing/"

static struct bpf_program *bpf_prog;
static struct bpf_object *obj;
static int queue_stats_fd;

static void read_trace_pipe2(void)
{
	int trace_fd;
	FILE *outf;
	char *outFname = "hbm_out.log";

	trace_fd = open(DEBUGFS "trace_pipe", O_RDONLY, 0);
	if (trace_fd < 0) {
		printf("Error opening trace_pipe\n");
		return;
	}

//	Future support of ingress
//	if (!outFlag)
//		outFname = "hbm_in.log";
	outf = fopen(outFname, "w");

	if (outf == NULL)
		printf("Error creating %s\n", outFname);

	while (1) {
		static char buf[4097];
		ssize_t sz;

		sz = read(trace_fd, buf, sizeof(buf) - 1);
		if (sz > 0) {
			buf[sz] = 0;
			puts(buf);
			if (outf != NULL) {
				fprintf(outf, "%s\n", buf);
				fflush(outf);
			}
		}
	}
}

static void do_error(char *msg, bool errno_flag)
{
	if (errno_flag)
		printf("ERROR: %s, errno: %d\n", msg, errno);
	else
		printf("ERROR: %s\n", msg);
	exit(1);
}

static int prog_load(char *prog)
{
	obj = bpf_object__open_file(prog, NULL);
	if (libbpf_get_error(obj)) {
		printf("ERROR: opening BPF object file failed\n");
		return 1;
	}

	/* load BPF program */
	if (bpf_object__load(obj)) {
		printf("ERROR: loading BPF object file failed\n");
		goto err;
	}

	bpf_prog = bpf_object__find_program_by_title(obj, "cgroup_skb/egress");
	if (!bpf_prog) {
		printf("ERROR: finding a prog in obj file failed\n");
		goto err;
	}

	queue_stats_fd = bpf_object__find_map_fd_by_name(obj, "queue_stats");
	if (queue_stats_fd < 0) {
		printf("ERROR: finding a map in obj file failed\n");
		goto err;
	}

	return 0;

err:
	bpf_object__close(obj);
	return 1;
}

static int run_bpf_prog(char *prog, int cg_id)
{
	struct hbm_queue_stats qstats = {0};
	char cg_dir[100], cg_pin_path[100];
	struct bpf_link *link = NULL;
	int key = 0;
	int cg1 = 0;
	int rc = 0;

	sprintf(cg_dir, "/hbm%d", cg_id);
	rc = prog_load(prog);
	if (rc != 0)
		return rc;

	if (setup_cgroup_environment()) {
		printf("ERROR: setting cgroup environment\n");
		goto err;
	}
	cg1 = create_and_get_cgroup(cg_dir);
	if (!cg1) {
		printf("ERROR: create_and_get_cgroup\n");
		goto err;
	}
	if (join_cgroup(cg_dir)) {
		printf("ERROR: join_cgroup\n");
		goto err;
	}

	qstats.rate = rate;
	qstats.stats = stats_flag ? 1 : 0;
	qstats.loopback = loopback_flag ? 1 : 0;
	qstats.no_cn = no_cn_flag ? 1 : 0;
	if (bpf_map_update_elem(queue_stats_fd, &key, &qstats, BPF_ANY)) {
		printf("ERROR: Could not update map element\n");
		goto err;
	}

	if (!outFlag)
		bpf_program__set_expected_attach_type(bpf_prog, BPF_CGROUP_INET_INGRESS);

	link = bpf_program__attach_cgroup(bpf_prog, cg1);
	if (libbpf_get_error(link)) {
		fprintf(stderr, "ERROR: bpf_program__attach_cgroup failed\n");
		goto err;
	}

	sprintf(cg_pin_path, "/sys/fs/bpf/hbm%d", cg_id);
	rc = bpf_link__pin(link, cg_pin_path);
	if (rc < 0) {
		printf("ERROR: bpf_link__pin failed: %d\n", rc);
		goto err;
	}

	if (work_conserving_flag) {
		struct timeval t0, t_last, t_new;
		FILE *fin;
		unsigned long long last_eth_tx_bytes, new_eth_tx_bytes;
		signed long long last_cg_tx_bytes, new_cg_tx_bytes;
		signed long long delta_time, delta_bytes, delta_rate;
		int delta_ms;
#define DELTA_RATE_CHECK 10000		/* in us */
#define RATE_THRESHOLD 9500000000	/* 9.5 Gbps */

		bpf_map_lookup_elem(queue_stats_fd, &key, &qstats);
		if (gettimeofday(&t0, NULL) < 0)
			do_error("gettimeofday failed", true);
		t_last = t0;
		fin = fopen("/sys/class/net/eth0/statistics/tx_bytes", "r");
		if (fscanf(fin, "%llu", &last_eth_tx_bytes) != 1)
			do_error("fscanf fails", false);
		fclose(fin);
		last_cg_tx_bytes = qstats.bytes_total;
		while (true) {
			usleep(DELTA_RATE_CHECK);
			if (gettimeofday(&t_new, NULL) < 0)
				do_error("gettimeofday failed", true);
			delta_ms = (t_new.tv_sec - t0.tv_sec) * 1000 +
				(t_new.tv_usec - t0.tv_usec)/1000;
			if (delta_ms > dur * 1000)
				break;
			delta_time = (t_new.tv_sec - t_last.tv_sec) * 1000000 +
				(t_new.tv_usec - t_last.tv_usec);
			if (delta_time == 0)
				continue;
			t_last = t_new;
			fin = fopen("/sys/class/net/eth0/statistics/tx_bytes",
				    "r");
			if (fscanf(fin, "%llu", &new_eth_tx_bytes) != 1)
				do_error("fscanf fails", false);
			fclose(fin);
			printf("  new_eth_tx_bytes:%llu\n",
			       new_eth_tx_bytes);
			bpf_map_lookup_elem(queue_stats_fd, &key, &qstats);
			new_cg_tx_bytes = qstats.bytes_total;
			delta_bytes = new_eth_tx_bytes - last_eth_tx_bytes;
			last_eth_tx_bytes = new_eth_tx_bytes;
			delta_rate = (delta_bytes * 8000000) / delta_time;
			printf("%5d - eth_rate:%.1fGbps cg_rate:%.3fGbps",
			       delta_ms, delta_rate/1000000000.0,
			       rate/1000.0);
			if (delta_rate < RATE_THRESHOLD) {
				/* can increase cgroup rate limit, but first
				 * check if we are using the current limit.
				 * Currently increasing by 6.25%, unknown
				 * if that is the optimal rate.
				 */
				int rate_diff100;

				delta_bytes = new_cg_tx_bytes -
					last_cg_tx_bytes;
				last_cg_tx_bytes = new_cg_tx_bytes;
				delta_rate = (delta_bytes * 8000000) /
					delta_time;
				printf(" rate:%.3fGbps",
				       delta_rate/1000000000.0);
				rate_diff100 = (((long long)rate)*1000000 -
						     delta_rate) * 100 /
					(((long long) rate) * 1000000);
				printf("  rdiff:%d", rate_diff100);
				if (rate_diff100  <= 3) {
					rate += (rate >> 4);
					if (rate > RATE_THRESHOLD / 1000000)
						rate = RATE_THRESHOLD / 1000000;
					qstats.rate = rate;
					printf(" INC\n");
				} else {
					printf("\n");
				}
			} else {
				/* Need to decrease cgroup rate limit.
				 * Currently decreasing by 12.5%, unknown
				 * if that is optimal
				 */
				printf(" DEC\n");
				rate -= (rate >> 3);
				if (rate < minRate)
					rate = minRate;
				qstats.rate = rate;
			}
			if (bpf_map_update_elem(queue_stats_fd, &key, &qstats, BPF_ANY))
				do_error("update map element fails", false);
		}
	} else {
		sleep(dur);
	}
	// Get stats!
	if (stats_flag && bpf_map_lookup_elem(queue_stats_fd, &key, &qstats)) {
		char fname[100];
		FILE *fout;

		if (!outFlag)
			sprintf(fname, "hbm.%d.in", cg_id);
		else
			sprintf(fname, "hbm.%d.out", cg_id);
		fout = fopen(fname, "w");
		fprintf(fout, "id:%d\n", cg_id);
		fprintf(fout, "ERROR: Could not lookup queue_stats\n");
	} else if (stats_flag && qstats.lastPacketTime >
		   qstats.firstPacketTime) {
		long long delta_us = (qstats.lastPacketTime -
				      qstats.firstPacketTime)/1000;
		unsigned int rate_mbps = ((qstats.bytes_total -
					   qstats.bytes_dropped) * 8 /
					  delta_us);
		double percent_pkts, percent_bytes;
		char fname[100];
		FILE *fout;
		int k;
		static const char *returnValNames[] = {
			"DROP_PKT",
			"ALLOW_PKT",
			"DROP_PKT_CWR",
			"ALLOW_PKT_CWR"
		};
#define RET_VAL_COUNT 4

// Future support of ingress
//		if (!outFlag)
//			sprintf(fname, "hbm.%d.in", cg_id);
//		else
		sprintf(fname, "hbm.%d.out", cg_id);
		fout = fopen(fname, "w");
		fprintf(fout, "id:%d\n", cg_id);
		fprintf(fout, "rate_mbps:%d\n", rate_mbps);
		fprintf(fout, "duration:%.1f secs\n",
			(qstats.lastPacketTime - qstats.firstPacketTime) /
			1000000000.0);
		fprintf(fout, "packets:%d\n", (int)qstats.pkts_total);
		fprintf(fout, "bytes_MB:%d\n", (int)(qstats.bytes_total /
						     1000000));
		fprintf(fout, "pkts_dropped:%d\n", (int)qstats.pkts_dropped);
		fprintf(fout, "bytes_dropped_MB:%d\n",
			(int)(qstats.bytes_dropped /
						       1000000));
		// Marked Pkts and Bytes
		percent_pkts = (qstats.pkts_marked * 100.0) /
			(qstats.pkts_total + 1);
		percent_bytes = (qstats.bytes_marked * 100.0) /
			(qstats.bytes_total + 1);
		fprintf(fout, "pkts_marked_percent:%6.2f\n", percent_pkts);
		fprintf(fout, "bytes_marked_percent:%6.2f\n", percent_bytes);

		// Dropped Pkts and Bytes
		percent_pkts = (qstats.pkts_dropped * 100.0) /
			(qstats.pkts_total + 1);
		percent_bytes = (qstats.bytes_dropped * 100.0) /
			(qstats.bytes_total + 1);
		fprintf(fout, "pkts_dropped_percent:%6.2f\n", percent_pkts);
		fprintf(fout, "bytes_dropped_percent:%6.2f\n", percent_bytes);

		// ECN CE markings
		percent_pkts = (qstats.pkts_ecn_ce * 100.0) /
			(qstats.pkts_total + 1);
		fprintf(fout, "pkts_ecn_ce:%6.2f (%d)\n", percent_pkts,
			(int)qstats.pkts_ecn_ce);

		// Average cwnd
		fprintf(fout, "avg cwnd:%d\n",
			(int)(qstats.sum_cwnd / (qstats.sum_cwnd_cnt + 1)));
		// Average rtt
		fprintf(fout, "avg rtt:%d\n",
			(int)(qstats.sum_rtt / (qstats.pkts_total + 1)));
		// Average credit
		if (edt_flag)
			fprintf(fout, "avg credit_ms:%.03f\n",
				(qstats.sum_credit /
				 (qstats.pkts_total + 1.0)) / 1000000.0);
		else
			fprintf(fout, "avg credit:%d\n",
				(int)(qstats.sum_credit /
				      (1500 * ((int)qstats.pkts_total ) + 1)));

		// Return values stats
		for (k = 0; k < RET_VAL_COUNT; k++) {
			percent_pkts = (qstats.returnValCount[k] * 100.0) /
				(qstats.pkts_total + 1);
			fprintf(fout, "%s:%6.2f (%d)\n", returnValNames[k],
				percent_pkts, (int)qstats.returnValCount[k]);
		}
		fclose(fout);
	}

	if (debugFlag)
		read_trace_pipe2();
	goto cleanup;

err:
	rc = 1;

cleanup:
	bpf_link__destroy(link);
	bpf_object__close(obj);

	if (cg1 != -1)
		close(cg1);

	if (rc != 0)
		cleanup_cgroup_environment();
	return rc;
}

static void Usage(void)
{
	printf("This program loads a cgroup skb BPF program to enforce\n"
	       "cgroup output (egress) bandwidth limits.\n\n"
	       "USAGE: hbm [-o] [-d]  [-l] [-n <id>] [--no_cn] [-r <rate>]\n"
	       "           [-s] [-t <secs>] [-w] [-h] [prog]\n"
	       "  Where:\n"
	       "    -o         indicates egress direction (default)\n"
	       "    -d         print BPF trace debug buffer\n"
	       "    --edt      use fq's Earliest Departure Time\n"
	       "    -l         also limit flows using loopback\n"
	       "    -n <#>     to create cgroup \"/hbm#\" and attach prog\n"
	       "               Default is /hbm1\n"
	       "    --no_cn    disable CN notifications\n"
	       "    -r <rate>  Rate in Mbps\n"
	       "    -s         Update HBM stats\n"
	       "    -t <time>  Exit after specified seconds (default is 0)\n"
	       "    -w	       Work conserving flag. cgroup can increase\n"
	       "               bandwidth beyond the rate limit specified\n"
	       "               while there is available bandwidth. Current\n"
	       "               implementation assumes there is only eth0\n"
	       "               but can be extended to support multiple NICs\n"
	       "    -h         print this info\n"
	       "    prog       BPF program file name. Name defaults to\n"
	       "                 hbm_out_kern.o\n");
}

int main(int argc, char **argv)
{
	char *prog = "hbm_out_kern.o";
	int  k;
	int cg_id = 1;
	char *optstring = "iodln:r:st:wh";
	struct option loptions[] = {
		{"no_cn", 0, NULL, 1},
		{"edt", 0, NULL, 2},
		{NULL, 0, NULL, 0}
	};

	while ((k = getopt_long(argc, argv, optstring, loptions, NULL)) != -1) {
		switch (k) {
		case 1:
			no_cn_flag = true;
			break;
		case 2:
			prog = "hbm_edt_kern.o";
			edt_flag = true;
			break;
		case'o':
			break;
		case 'd':
			debugFlag = true;
			break;
		case 'l':
			loopback_flag = true;
			break;
		case 'n':
			cg_id = atoi(optarg);
			break;
		case 'r':
			minRate = atoi(optarg) * 1.024;
			rate = minRate;
			break;
		case 's':
			stats_flag = true;
			break;
		case 't':
			dur = atoi(optarg);
			break;
		case 'w':
			work_conserving_flag = true;
			break;
		case '?':
			if (optopt == 'n' || optopt == 'r' || optopt == 't')
				fprintf(stderr,
					"Option -%c requires an argument.\n\n",
					optopt);
		case 'h':
			__fallthrough;
		default:
			Usage();
			return 0;
		}
	}

	if (optind < argc)
		prog = argv[optind];
	printf("HBM prog: %s\n", prog != NULL ? prog : "NULL");

	return run_bpf_prog(prog, cg_id);
}
Commit	Line	Data
a1270fe9	1	// SPDX-License-Identifier: GPL-2.0
	2	/* Copyright (c) 2019 Facebook
	3	*
	4	* This program is free software; you can redistribute it and/or
	5	* modify it under the terms of version 2 of the GNU General Public
	6	* License as published by the Free Software Foundation.
	7	*
	8	* Example program for Host Bandwidth Managment
	9	*
	10	* This program loads a cgroup skb BPF program to enforce cgroup output
	11	* (egress) or input (ingress) bandwidth limits.
	12	*
	13	* USAGE: hbm [-d] [-l] [-n <id>] [-r <rate>] [-s] [-t <secs>] [-w] [-h] [prog]
	14	* Where:
	15	* -d Print BPF trace debug buffer
	16	* -l Also limit flows doing loopback
	17	* -n <#> To create cgroup \"/hbm#\" and attach prog
	18	* Default is /hbm1
ffd81558	19	* --no_cn Do not return cn notifications
a1270fe9	20	* -r <rate> Rate limit in Mbps
a1270fe9	21	* -s Get HBM stats (marked, dropped, etc.)
5b4f21b2	22	* -t <time> Exit after specified seconds (default is 0)
a1270fe9	23	* -w Work conserving flag. cgroup can increase its bandwidth
	24	* beyond the rate limit specified while there is available
	25	* bandwidth. Current implementation assumes there is only
	26	* NIC (eth0), but can be extended to support multiple NICs.
	27	* Currrently only supported for egress.
	28	* -h Print this info
	29	* prog BPF program file name. Name defaults to hbm_out_kern.o
	30	*/
	31
	32	#define _GNU_SOURCE
	33
	34	#include <stdio.h>
	35	#include <stdlib.h>
	36	#include <assert.h>
	37	#include <sys/resource.h>
	38	#include <sys/time.h>
	39	#include <unistd.h>
	40	#include <errno.h>
	41	#include <fcntl.h>
	42	#include <linux/unistd.h>
544d6adf	43	#include <linux/compiler.h>
a1270fe9	44
	45	#include <linux/bpf.h>
	46	#include <bpf/bpf.h>
ffd81558	47	#include <getopt.h>
a1270fe9	48
a1270fe9	49	#include "bpf_rlimit.h"
	50	#include "cgroup_helpers.h"
	51	#include "hbm.h"
	52	#include "bpf_util.h"
7cf245a3	53	#include <bpf/libbpf.h>
a1270fe9	54
	55	bool outFlag = true;
	56	int minRate = 1000; /* cgroup rate limit in Mbps */
	57	int rate = 1000; /* can grow if rate conserving is enabled */
	58	int dur = 1;
	59	bool stats_flag;
	60	bool loopback_flag;
	61	bool debugFlag;
	62	bool work_conserving_flag;
ffd81558	63	bool no_cn_flag;
71634d7f	64	bool edt_flag;
a1270fe9	65
	66	static void Usage(void);
	67	static void read_trace_pipe2(void);
	68	static void do_error(char *msg, bool errno_flag);
	69
	70	#define DEBUGFS "/sys/kernel/debug/tracing/"
	71
c5815ac7 DL	72	static struct bpf_program *bpf_prog;
	73	static struct bpf_object *obj;
	74	static int queue_stats_fd;
a1270fe9	75
	76	static void read_trace_pipe2(void)
	77	{
	78	int trace_fd;
	79	FILE *outf;
	80	char *outFname = "hbm_out.log";
	81
	82	trace_fd = open(DEBUGFS "trace_pipe", O_RDONLY, 0);
	83	if (trace_fd < 0) {
	84	printf("Error opening trace_pipe\n");
	85	return;
	86	}
	87
	88	// Future support of ingress
	89	// if (!outFlag)
	90	// outFname = "hbm_in.log";
	91	outf = fopen(outFname, "w");
	92
	93	if (outf == NULL)
	94	printf("Error creating %s\n", outFname);
	95
	96	while (1) {
	97	static char buf[4097];
	98	ssize_t sz;
	99
	100	sz = read(trace_fd, buf, sizeof(buf) - 1);
	101	if (sz > 0) {
	102	buf[sz] = 0;
	103	puts(buf);
	104	if (outf != NULL) {
	105	fprintf(outf, "%s\n", buf);
	106	fflush(outf);
	107	}
	108	}
	109	}
	110	}
	111
	112	static void do_error(char *msg, bool errno_flag)
	113	{
	114	if (errno_flag)
	115	printf("ERROR: %s, errno: %d\n", msg, errno);
	116	else
	117	printf("ERROR: %s\n", msg);
	118	exit(1);
	119	}
	120
	121	static int prog_load(char *prog)
	122	{
c5815ac7 DL	123	obj = bpf_object__open_file(prog, NULL);
	124	if (libbpf_get_error(obj)) {
	125	printf("ERROR: opening BPF object file failed\n");
a1270fe9	126	return 1;
a1270fe9	127	}
c5815ac7 DL	128
	129	/* load BPF program */
	130	if (bpf_object__load(obj)) {
	131	printf("ERROR: loading BPF object file failed\n");
	132	goto err;
a1270fe9	133	}
a1270fe9	134
c5815ac7 DL	135	bpf_prog = bpf_object__find_program_by_title(obj, "cgroup_skb/egress");
	136	if (!bpf_prog) {
	137	printf("ERROR: finding a prog in obj file failed\n");
	138	goto err;
a1270fe9	139	}
a1270fe9	140
c5815ac7 DL	141	queue_stats_fd = bpf_object__find_map_fd_by_name(obj, "queue_stats");
	142	if (queue_stats_fd < 0) {
	143	printf("ERROR: finding a map in obj file failed\n");
	144	goto err;
	145	}
	146
	147	return 0;
	148
	149	err:
	150	bpf_object__close(obj);
	151	return 1;
a1270fe9	152	}
	153
	154	static int run_bpf_prog(char *prog, int cg_id)
	155	{
c5815ac7 DL	156	struct hbm_queue_stats qstats = {0};
	157	char cg_dir[100], cg_pin_path[100];
	158	struct bpf_link *link = NULL;
a1270fe9	159	int key = 0;
a1270fe9	160	int cg1 = 0;
c5815ac7	161	int rc = 0;
a1270fe9	162
a1270fe9	163	sprintf(cg_dir, "/hbm%d", cg_id);
c5815ac7 DL	164	rc = prog_load(prog);
	165	if (rc != 0)
	166	return rc;
a1270fe9	167
	168	if (setup_cgroup_environment()) {
	169	printf("ERROR: setting cgroup environment\n");
	170	goto err;
	171	}
	172	cg1 = create_and_get_cgroup(cg_dir);
	173	if (!cg1) {
	174	printf("ERROR: create_and_get_cgroup\n");
	175	goto err;
	176	}
	177	if (join_cgroup(cg_dir)) {
	178	printf("ERROR: join_cgroup\n");
	179	goto err;
	180	}
	181
	182	qstats.rate = rate;
	183	qstats.stats = stats_flag ? 1 : 0;
	184	qstats.loopback = loopback_flag ? 1 : 0;
ffd81558	185	qstats.no_cn = no_cn_flag ? 1 : 0;
c5815ac7	186	if (bpf_map_update_elem(queue_stats_fd, &key, &qstats, BPF_ANY)) {
a1270fe9	187	printf("ERROR: Could not update map element\n");
	188	goto err;
	189	}
	190
	191	if (!outFlag)
c5815ac7 DL	192	bpf_program__set_expected_attach_type(bpf_prog, BPF_CGROUP_INET_INGRESS);
	193
	194	link = bpf_program__attach_cgroup(bpf_prog, cg1);
	195	if (libbpf_get_error(link)) {
	196	fprintf(stderr, "ERROR: bpf_program__attach_cgroup failed\n");
	197	goto err;
	198	}
	199
	200	sprintf(cg_pin_path, "/sys/fs/bpf/hbm%d", cg_id);
	201	rc = bpf_link__pin(link, cg_pin_path);
	202	if (rc < 0) {
	203	printf("ERROR: bpf_link__pin failed: %d\n", rc);
a1270fe9	204	goto err;
	205	}
	206
	207	if (work_conserving_flag) {
	208	struct timeval t0, t_last, t_new;
	209	FILE *fin;
	210	unsigned long long last_eth_tx_bytes, new_eth_tx_bytes;
	211	signed long long last_cg_tx_bytes, new_cg_tx_bytes;
	212	signed long long delta_time, delta_bytes, delta_rate;
	213	int delta_ms;
	214	#define DELTA_RATE_CHECK 10000 /* in us */
	215	#define RATE_THRESHOLD 9500000000 /* 9.5 Gbps */
	216
c5815ac7	217	bpf_map_lookup_elem(queue_stats_fd, &key, &qstats);
a1270fe9	218	if (gettimeofday(&t0, NULL) < 0)
	219	do_error("gettimeofday failed", true);
	220	t_last = t0;
	221	fin = fopen("/sys/class/net/eth0/statistics/tx_bytes", "r");
	222	if (fscanf(fin, "%llu", &last_eth_tx_bytes) != 1)
	223	do_error("fscanf fails", false);
	224	fclose(fin);
	225	last_cg_tx_bytes = qstats.bytes_total;
	226	while (true) {
	227	usleep(DELTA_RATE_CHECK);
	228	if (gettimeofday(&t_new, NULL) < 0)
	229	do_error("gettimeofday failed", true);
	230	delta_ms = (t_new.tv_sec - t0.tv_sec) * 1000 +
	231	(t_new.tv_usec - t0.tv_usec)/1000;
	232	if (delta_ms > dur * 1000)
	233	break;
	234	delta_time = (t_new.tv_sec - t_last.tv_sec) * 1000000 +
	235	(t_new.tv_usec - t_last.tv_usec);
	236	if (delta_time == 0)
	237	continue;
	238	t_last = t_new;
	239	fin = fopen("/sys/class/net/eth0/statistics/tx_bytes",
	240	"r");
	241	if (fscanf(fin, "%llu", &new_eth_tx_bytes) != 1)
	242	do_error("fscanf fails", false);
	243	fclose(fin);
	244	printf(" new_eth_tx_bytes:%llu\n",
	245	new_eth_tx_bytes);
c5815ac7	246	bpf_map_lookup_elem(queue_stats_fd, &key, &qstats);
a1270fe9	247	new_cg_tx_bytes = qstats.bytes_total;
	248	delta_bytes = new_eth_tx_bytes - last_eth_tx_bytes;
	249	last_eth_tx_bytes = new_eth_tx_bytes;
	250	delta_rate = (delta_bytes * 8000000) / delta_time;
	251	printf("%5d - eth_rate:%.1fGbps cg_rate:%.3fGbps",
	252	delta_ms, delta_rate/1000000000.0,
	253	rate/1000.0);
	254	if (delta_rate < RATE_THRESHOLD) {
	255	/* can increase cgroup rate limit, but first
	256	* check if we are using the current limit.
	257	* Currently increasing by 6.25%, unknown
	258	* if that is the optimal rate.
	259	*/
	260	int rate_diff100;
	261
	262	delta_bytes = new_cg_tx_bytes -
	263	last_cg_tx_bytes;
	264	last_cg_tx_bytes = new_cg_tx_bytes;
	265	delta_rate = (delta_bytes * 8000000) /
	266	delta_time;
	267	printf(" rate:%.3fGbps",
	268	delta_rate/1000000000.0);
	269	rate_diff100 = (((long long)rate)*1000000 -
	270	delta_rate) * 100 /
	271	(((long long) rate) * 1000000);
	272	printf(" rdiff:%d", rate_diff100);
	273	if (rate_diff100 <= 3) {
	274	rate += (rate >> 4);
	275	if (rate > RATE_THRESHOLD / 1000000)
	276	rate = RATE_THRESHOLD / 1000000;
	277	qstats.rate = rate;
	278	printf(" INC\n");
	279	} else {
	280	printf("\n");
	281	}
	282	} else {
	283	/* Need to decrease cgroup rate limit.
	284	* Currently decreasing by 12.5%, unknown
	285	* if that is optimal
	286	*/
	287	printf(" DEC\n");
	288	rate -= (rate >> 3);
	289	if (rate < minRate)
	290	rate = minRate;
	291	qstats.rate = rate;
	292	}
c5815ac7	293	if (bpf_map_update_elem(queue_stats_fd, &key, &qstats, BPF_ANY))
a1270fe9	294	do_error("update map element fails", false);
	295	}
	296	} else {
	297	sleep(dur);
	298	}
	299	// Get stats!
c5815ac7	300	if (stats_flag && bpf_map_lookup_elem(queue_stats_fd, &key, &qstats)) {
a1270fe9	301	char fname[100];
	302	FILE *fout;
	303
	304	if (!outFlag)
	305	sprintf(fname, "hbm.%d.in", cg_id);
	306	else
	307	sprintf(fname, "hbm.%d.out", cg_id);
	308	fout = fopen(fname, "w");
	309	fprintf(fout, "id:%d\n", cg_id);
	310	fprintf(fout, "ERROR: Could not lookup queue_stats\n");
	311	} else if (stats_flag && qstats.lastPacketTime >
	312	qstats.firstPacketTime) {
	313	long long delta_us = (qstats.lastPacketTime -
	314	qstats.firstPacketTime)/1000;
	315	unsigned int rate_mbps = ((qstats.bytes_total -
	316	qstats.bytes_dropped) * 8 /
	317	delta_us);
	318	double percent_pkts, percent_bytes;
	319	char fname[100];
	320	FILE *fout;
d58c6f72	321	int k;
	322	static const char *returnValNames[] = {
	323	"DROP_PKT",
	324	"ALLOW_PKT",
	325	"DROP_PKT_CWR",
	326	"ALLOW_PKT_CWR"
	327	};
	328	#define RET_VAL_COUNT 4
a1270fe9	329
	330	// Future support of ingress
	331	// if (!outFlag)
	332	// sprintf(fname, "hbm.%d.in", cg_id);
	333	// else
	334	sprintf(fname, "hbm.%d.out", cg_id);
	335	fout = fopen(fname, "w");
	336	fprintf(fout, "id:%d\n", cg_id);
	337	fprintf(fout, "rate_mbps:%d\n", rate_mbps);
	338	fprintf(fout, "duration:%.1f secs\n",
	339	(qstats.lastPacketTime - qstats.firstPacketTime) /
	340	1000000000.0);
	341	fprintf(fout, "packets:%d\n", (int)qstats.pkts_total);
	342	fprintf(fout, "bytes_MB:%d\n", (int)(qstats.bytes_total /
	343	1000000));
	344	fprintf(fout, "pkts_dropped:%d\n", (int)qstats.pkts_dropped);
	345	fprintf(fout, "bytes_dropped_MB:%d\n",
	346	(int)(qstats.bytes_dropped /
	347	1000000));
	348	// Marked Pkts and Bytes
	349	percent_pkts = (qstats.pkts_marked * 100.0) /
	350	(qstats.pkts_total + 1);
	351	percent_bytes = (qstats.bytes_marked * 100.0) /
	352	(qstats.bytes_total + 1);
	353	fprintf(fout, "pkts_marked_percent:%6.2f\n", percent_pkts);
	354	fprintf(fout, "bytes_marked_percent:%6.2f\n", percent_bytes);
	355
	356	// Dropped Pkts and Bytes
	357	percent_pkts = (qstats.pkts_dropped * 100.0) /
	358	(qstats.pkts_total + 1);
	359	percent_bytes = (qstats.bytes_dropped * 100.0) /
	360	(qstats.bytes_total + 1);
	361	fprintf(fout, "pkts_dropped_percent:%6.2f\n", percent_pkts);
	362	fprintf(fout, "bytes_dropped_percent:%6.2f\n", percent_bytes);
d58c6f72	363
	364	// ECN CE markings
	365	percent_pkts = (qstats.pkts_ecn_ce * 100.0) /
	366	(qstats.pkts_total + 1);
	367	fprintf(fout, "pkts_ecn_ce:%6.2f (%d)\n", percent_pkts,
	368	(int)qstats.pkts_ecn_ce);
	369
	370	// Average cwnd
	371	fprintf(fout, "avg cwnd:%d\n",
	372	(int)(qstats.sum_cwnd / (qstats.sum_cwnd_cnt + 1)));
	373	// Average rtt
	374	fprintf(fout, "avg rtt:%d\n",
	375	(int)(qstats.sum_rtt / (qstats.pkts_total + 1)));
	376	// Average credit
71634d7f	377	if (edt_flag)
	378	fprintf(fout, "avg credit_ms:%.03f\n",
	379	(qstats.sum_credit /
	380	(qstats.pkts_total + 1.0)) / 1000000.0);
	381	else
	382	fprintf(fout, "avg credit:%d\n",
	383	(int)(qstats.sum_credit /
	384	(1500 * ((int)qstats.pkts_total ) + 1)));
d58c6f72	385
	386	// Return values stats
	387	for (k = 0; k < RET_VAL_COUNT; k++) {
	388	percent_pkts = (qstats.returnValCount[k] * 100.0) /
	389	(qstats.pkts_total + 1);
	390	fprintf(fout, "%s:%6.2f (%d)\n", returnValNames[k],
	391	percent_pkts, (int)qstats.returnValCount[k]);
	392	}
a1270fe9	393	fclose(fout);
	394	}
	395
	396	if (debugFlag)
	397	read_trace_pipe2();
c5815ac7 DL	398	goto cleanup;
c5815ac7 DL	399
a1270fe9	400	err:
	401	rc = 1;
	402
c5815ac7 DL	403	cleanup:
	404	bpf_link__destroy(link);
	405	bpf_object__close(obj);
	406
	407	if (cg1 != -1)
a1270fe9	408	close(cg1);
a1270fe9	409
c5815ac7 DL	410	if (rc != 0)
c5815ac7 DL	411	cleanup_cgroup_environment();
a1270fe9	412	return rc;
	413	}
	414
	415	static void Usage(void)
	416	{
	417	printf("This program loads a cgroup skb BPF program to enforce\n"
	418	"cgroup output (egress) bandwidth limits.\n\n"
ffd81558	419	"USAGE: hbm [-o] [-d] [-l] [-n <id>] [--no_cn] [-r <rate>]\n"
ffd81558	420	" [-s] [-t <secs>] [-w] [-h] [prog]\n"
a1270fe9	421	" Where:\n"
	422	" -o indicates egress direction (default)\n"
	423	" -d print BPF trace debug buffer\n"
71634d7f	424	" --edt use fq's Earliest Departure Time\n"
a1270fe9	425	" -l also limit flows using loopback\n"
	426	" -n <#> to create cgroup \"/hbm#\" and attach prog\n"
	427	" Default is /hbm1\n"
2ed99339	428	" --no_cn disable CN notifications\n"
a1270fe9	429	" -r <rate> Rate in Mbps\n"
a1270fe9	430	" -s Update HBM stats\n"
5b4f21b2	431	" -t <time> Exit after specified seconds (default is 0)\n"
a1270fe9	432	" -w Work conserving flag. cgroup can increase\n"
	433	" bandwidth beyond the rate limit specified\n"
	434	" while there is available bandwidth. Current\n"
	435	" implementation assumes there is only eth0\n"
	436	" but can be extended to support multiple NICs\n"
	437	" -h print this info\n"
	438	" prog BPF program file name. Name defaults to\n"
	439	" hbm_out_kern.o\n");
	440	}
	441
	442	int main(int argc, char **argv)
	443	{
	444	char *prog = "hbm_out_kern.o";
	445	int k;
	446	int cg_id = 1;
	447	char *optstring = "iodln:r:st:wh";
ffd81558	448	struct option loptions[] = {
ffd81558	449	{"no_cn", 0, NULL, 1},
71634d7f	450	{"edt", 0, NULL, 2},
ffd81558	451	{NULL, 0, NULL, 0}
ffd81558	452	};
a1270fe9	453
ffd81558	454	while ((k = getopt_long(argc, argv, optstring, loptions, NULL)) != -1) {
a1270fe9	455	switch (k) {
ffd81558	456	case 1:
	457	no_cn_flag = true;
	458	break;
71634d7f	459	case 2:
	460	prog = "hbm_edt_kern.o";
	461	edt_flag = true;
	462	break;
a1270fe9	463	case'o':
	464	break;
	465	case 'd':
	466	debugFlag = true;
	467	break;
	468	case 'l':
	469	loopback_flag = true;
	470	break;
	471	case 'n':
	472	cg_id = atoi(optarg);
	473	break;
	474	case 'r':
	475	minRate = atoi(optarg) * 1.024;
	476	rate = minRate;
	477	break;
	478	case 's':
	479	stats_flag = true;
	480	break;
	481	case 't':
	482	dur = atoi(optarg);
	483	break;
	484	case 'w':
	485	work_conserving_flag = true;
	486	break;
	487	case '?':
	488	if (optopt == 'n' \|\| optopt == 'r' \|\| optopt == 't')
	489	fprintf(stderr,
	490	"Option -%c requires an argument.\n\n",
	491	optopt);
	492	case 'h':
544d6adf	493	__fallthrough;
a1270fe9	494	default:
	495	Usage();
	496	return 0;
	497	}
	498	}
	499
	500	if (optind < argc)
	501	prog = argv[optind];
	502	printf("HBM prog: %s\n", prog != NULL ? prog : "NULL");
	503
	504	return run_bpf_prog(prog, cg_id);
	505	}