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dcb: Add a subtool for the DCB buffer object
DCBNL buffer interfaces are an extension to the 802.1q DCB interfaces and
allow configuration of port headroom buffers.
Add a dcb subtool to allow showing and tweaking of buffer priority mapping
and buffer sizes. For example:
# dcb buf show dev eni1np1
prio-buffer 0:0 1:0 2:0 3:3 4:0 5:0 6:6 7:0
buffer-size 0:10000 1:0 2:0 3:70000 4:0 5:0 6:10000 7:0
total-size 221072
Signed-off-by: Petr Machata <me@pmachata.org>
Signed-off-by: David Ahern <dsahern@gmail.com>
This commit is contained in:
Petr Machata
David Ahern
parent
6567cb588b
commit
2e36f91000
@ -5,7 +5,7 @@ TARGETS :=
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ifeq ($(HAVE_MNL),y)
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DCBOBJ = dcb.o dcb_ets.o dcb_pfc.o
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DCBOBJ = dcb.o dcb_buffer.o dcb_ets.o dcb_pfc.o
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TARGETS += dcb
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endif
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@ -332,7 +332,7 @@ static void dcb_help(void)
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fprintf(stderr,
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"Usage: dcb [ OPTIONS ] OBJECT { COMMAND | help }\n"
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" dcb [ -f | --force ] { -b | --batch } filename [ -N | --Netns ] netnsname\n"
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"where OBJECT := { ets | pfc }\n"
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"where OBJECT := { buffer | ets | pfc }\n"
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" OPTIONS := [ -V | --Version | -i | --iec | -j | --json\n"
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" | -p | --pretty | -s | --statistics | -v | --verbose]\n");
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}
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@ -342,6 +342,8 @@ static int dcb_cmd(struct dcb *dcb, int argc, char **argv)
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if (!argc || matches(*argv, "help") == 0) {
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dcb_help();
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return 0;
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} else if (matches(*argv, "buffer") == 0) {
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return dcb_cmd_buffer(dcb, argc - 1, argv + 1);
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} else if (matches(*argv, "ets") == 0) {
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return dcb_cmd_ets(dcb, argc - 1, argv + 1);
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} else if (matches(*argv, "pfc") == 0) {
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@ -42,6 +42,10 @@ void dcb_print_array_on_off(const __u8 *array, size_t size);
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void dcb_print_array_kw(const __u8 *array, size_t array_size,
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const char *const kw[], size_t kw_size);
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/* dcb_buffer.c */
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int dcb_cmd_buffer(struct dcb *dcb, int argc, char **argv);
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/* dcb_ets.c */
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int dcb_cmd_ets(struct dcb *dcb, int argc, char **argv);
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235
dcb/dcb_buffer.c
Normal file
235
dcb/dcb_buffer.c
Normal file
@ -0,0 +1,235 @@
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// SPDX-License-Identifier: GPL-2.0+
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#include <errno.h>
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#include <inttypes.h>
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#include <stdio.h>
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#include <linux/dcbnl.h>
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#include "dcb.h"
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#include "utils.h"
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static void dcb_buffer_help_set(void)
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{
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fprintf(stderr,
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"Usage: dcb buffer set dev STRING\n"
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" [ prio-buffer PRIO-MAP ]\n"
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" [ buffer-size SIZE-MAP ]\n"
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"\n"
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" where PRIO-MAP := [ PRIO-MAP ] PRIO-MAPPING\n"
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" PRIO-MAPPING := { all | PRIO }:BUFFER\n"
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" SIZE-MAP := [ SIZE-MAP ] SIZE-MAPPING\n"
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" SIZE-MAPPING := { all | BUFFER }:INTEGER\n"
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" PRIO := { 0 .. 7 }\n"
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" BUFFER := { 0 .. 7 }\n"
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"\n"
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);
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}
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static void dcb_buffer_help_show(void)
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{
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fprintf(stderr,
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"Usage: dcb buffer show dev STRING\n"
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" [ prio-buffer ] [ buffer-size ] [ total-size ]\n"
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"\n"
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);
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}
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static void dcb_buffer_help(void)
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{
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fprintf(stderr,
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"Usage: dcb buffer help\n"
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"\n"
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);
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dcb_buffer_help_show();
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dcb_buffer_help_set();
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}
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static int dcb_buffer_parse_mapping_prio_buffer(__u32 key, char *value, void *data)
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{
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struct dcbnl_buffer *buffer = data;
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__u8 buf;
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if (get_u8(&buf, value, 0))
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return -EINVAL;
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return dcb_parse_mapping("PRIO", key, IEEE_8021Q_MAX_PRIORITIES - 1,
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"BUFFER", buf, DCBX_MAX_BUFFERS - 1,
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dcb_set_u8, buffer->prio2buffer);
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}
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static int dcb_buffer_parse_mapping_buffer_size(__u32 key, char *value, void *data)
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{
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struct dcbnl_buffer *buffer = data;
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unsigned int size;
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if (get_size(&size, value)) {
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fprintf(stderr, "%d:%s: Illegal value for buffer size\n", key, value);
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return -EINVAL;
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}
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return dcb_parse_mapping("BUFFER", key, DCBX_MAX_BUFFERS - 1,
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"INTEGER", size, -1,
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dcb_set_u32, buffer->buffer_size);
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}
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static void dcb_buffer_print_total_size(const struct dcbnl_buffer *buffer)
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{
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print_size(PRINT_ANY, "total_size", "total-size %s ", buffer->total_size);
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}
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static void dcb_buffer_print_prio_buffer(const struct dcbnl_buffer *buffer)
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{
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dcb_print_named_array("prio_buffer", "prio-buffer",
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buffer->prio2buffer, ARRAY_SIZE(buffer->prio2buffer),
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dcb_print_array_u8);
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}
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static void dcb_buffer_print_buffer_size(const struct dcbnl_buffer *buffer)
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{
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size_t size = ARRAY_SIZE(buffer->buffer_size);
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SPRINT_BUF(b);
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size_t i;
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open_json_array(PRINT_JSON, "buffer_size");
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print_string(PRINT_FP, NULL, "buffer-size ", NULL);
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for (i = 0; i < size; i++) {
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snprintf(b, sizeof(b), "%zd:%%s ", i);
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print_size(PRINT_ANY, NULL, b, buffer->buffer_size[i]);
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}
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close_json_array(PRINT_JSON, "buffer_size");
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}
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static void dcb_buffer_print(const struct dcbnl_buffer *buffer)
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{
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dcb_buffer_print_prio_buffer(buffer);
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print_nl();
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dcb_buffer_print_buffer_size(buffer);
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print_nl();
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dcb_buffer_print_total_size(buffer);
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print_nl();
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}
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static int dcb_buffer_get(struct dcb *dcb, const char *dev, struct dcbnl_buffer *buffer)
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{
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return dcb_get_attribute(dcb, dev, DCB_ATTR_DCB_BUFFER, buffer, sizeof(*buffer));
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}
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static int dcb_buffer_set(struct dcb *dcb, const char *dev, const struct dcbnl_buffer *buffer)
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{
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return dcb_set_attribute(dcb, dev, DCB_ATTR_DCB_BUFFER, buffer, sizeof(*buffer));
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}
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static int dcb_cmd_buffer_set(struct dcb *dcb, const char *dev, int argc, char **argv)
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{
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struct dcbnl_buffer buffer;
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int ret;
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if (!argc) {
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dcb_buffer_help_set();
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return 0;
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}
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ret = dcb_buffer_get(dcb, dev, &buffer);
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if (ret)
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return ret;
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do {
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if (matches(*argv, "help") == 0) {
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dcb_buffer_help_set();
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return 0;
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} else if (matches(*argv, "prio-buffer") == 0) {
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NEXT_ARG();
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ret = parse_mapping(&argc, &argv, true,
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&dcb_buffer_parse_mapping_prio_buffer, &buffer);
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if (ret) {
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fprintf(stderr, "Invalid priority mapping %s\n", *argv);
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return ret;
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}
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continue;
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} else if (matches(*argv, "buffer-size") == 0) {
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NEXT_ARG();
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ret = parse_mapping(&argc, &argv, true,
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&dcb_buffer_parse_mapping_buffer_size, &buffer);
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if (ret) {
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fprintf(stderr, "Invalid buffer size mapping %s\n", *argv);
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return ret;
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}
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continue;
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} else {
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fprintf(stderr, "What is \"%s\"?\n", *argv);
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dcb_buffer_help_set();
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return -EINVAL;
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}
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NEXT_ARG_FWD();
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} while (argc > 0);
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return dcb_buffer_set(dcb, dev, &buffer);
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}
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static int dcb_cmd_buffer_show(struct dcb *dcb, const char *dev, int argc, char **argv)
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{
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struct dcbnl_buffer buffer;
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int ret;
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ret = dcb_buffer_get(dcb, dev, &buffer);
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if (ret)
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return ret;
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open_json_object(NULL);
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if (!argc) {
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dcb_buffer_print(&buffer);
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goto out;
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}
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do {
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if (matches(*argv, "help") == 0) {
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dcb_buffer_help_show();
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return 0;
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} else if (matches(*argv, "prio-buffer") == 0) {
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dcb_buffer_print_prio_buffer(&buffer);
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print_nl();
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} else if (matches(*argv, "buffer-size") == 0) {
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dcb_buffer_print_buffer_size(&buffer);
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print_nl();
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} else if (matches(*argv, "total-size") == 0) {
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dcb_buffer_print_total_size(&buffer);
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print_nl();
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} else {
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fprintf(stderr, "What is \"%s\"?\n", *argv);
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dcb_buffer_help_show();
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return -EINVAL;
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}
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NEXT_ARG_FWD();
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} while (argc > 0);
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out:
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close_json_object();
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return 0;
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}
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int dcb_cmd_buffer(struct dcb *dcb, int argc, char **argv)
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{
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if (!argc || matches(*argv, "help") == 0) {
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dcb_buffer_help();
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return 0;
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} else if (matches(*argv, "show") == 0) {
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NEXT_ARG_FWD();
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return dcb_cmd_parse_dev(dcb, argc, argv,
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dcb_cmd_buffer_show, dcb_buffer_help_show);
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} else if (matches(*argv, "set") == 0) {
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NEXT_ARG_FWD();
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return dcb_cmd_parse_dev(dcb, argc, argv,
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dcb_cmd_buffer_set, dcb_buffer_help_set);
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} else {
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fprintf(stderr, "What is \"%s\"?\n", *argv);
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dcb_buffer_help();
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return -EINVAL;
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}
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}
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126
man/man8/dcb-buffer.8
Normal file
126
man/man8/dcb-buffer.8
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@ -0,0 +1,126 @@
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.TH DCB-BUFFER 8 "12 November 2020" "iproute2" "Linux"
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.SH NAME
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dcb-buffer \- show / manipulate port buffer settings of
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the DCB (Data Center Bridging) subsystem
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.SH SYNOPSIS
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.sp
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.ad l
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.in +8
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.ti -8
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.B dcb
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.RI "[ " OPTIONS " ] "
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.B buffer
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.RI "{ " COMMAND " | " help " }"
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.sp
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.ti -8
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.B dcb buffer show dev
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.RI DEV
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.RB "[ " prio-buffer " ]"
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.RB "[ " buffer-size " ]"
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.RB "[ " total-size " ]"
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.ti -8
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.B dcb buffer set dev
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.RI DEV
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.RB "[ " prio-buffer " " \fIPRIO-MAP " ]"
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.RB "[ " buffer-size " " \fISIZE-MAP " ]"
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.ti -8
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.IR PRIO-MAP " := [ " PRIO-MAP " ] " PRIO-MAPPING
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.ti -8
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.IR PRIO-MAPPING " := { " PRIO " | " \fBall " }" \fB:\fIBUFFER\fR
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.ti -8
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.IR SIZE-MAP " := [ " SIZE-MAP " ] " SIZE-MAPPING
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.ti -8
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.IR SIZE-MAPPING " := { " BUFFER " | " \fBall " }" \fB:\fISIZE\fR
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.ti -8
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.IR PRIO " := { " \fB0\fR " .. " \fB7\fR " }"
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.ti -8
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.IR BUFFER " := { " \fB0\fR " .. " \fB7\fR " }"
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.ti -8
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.IR SIZE " := { " INTEGER " | " INTEGER\fBK\fR " | " INTEGER\fBM\fR " | " ... " }"
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.SH DESCRIPTION
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.B dcb buffer
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is used to configure assignment of traffic to port buffers based on traffic
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priority, and sizes of those buffers. It can be also used to inspect the current
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configuration, as well as total device memory that the port buffers take.
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.SH PARAMETERS
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For read-write parameters, the following describes only the write direction,
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i.e. as used with the \fBset\fR command. For the \fBshow\fR command, the
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parameter name is to be used as a simple keyword without further arguments. This
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instructs the tool to show the value of a given parameter. When no parameters
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are given, the tool shows the complete buffer configuration.
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.TP
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.B total-size
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A read-only property that shows the total device memory taken up by port
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buffers. This might be more than a simple sum of individual buffer sizes if
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there are any hidden or internal buffers.
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.TP
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.B prio-buffer \fIPRIO-MAP
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\fIPRIO-MAP\fR uses the array parameter syntax, see
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.BR dcb (8)
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for details. Keys are priorities, values are buffer indices. For each priority
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sets a buffer where traffic with that priority is directed to.
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.TP
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.B buffer-size \fISIZE-MAP
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\fISIZE-MAP\fR uses the array parameter syntax, see
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.BR dcb (8)
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for details. Keys are buffer indices, values are sizes of that buffer in bytes.
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The sizes can use the notation documented in section PARAMETERS at
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.BR tc (8).
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Note that the size requested by the tool can be rounded or capped by the driver
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to satisfy the requirements of the device.
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.SH EXAMPLE & USAGE
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Configure the priomap in a one-to-one fashion:
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.P
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# dcb buffer set dev eth0 prio-buffer 0:0 1:1 2:2 3:3 4:4 5:5 6:6 7:7
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Set sizes of all buffers to 10KB, except for buffer 6, which will have the size
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1MB:
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.P
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# dcb buffer set dev eth0 buffer-size all:10K 6:1M
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Show what was set:
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.P
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# dcb buffer show dev eth0
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.br
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prio-buffer 0:0 1:1 2:2 3:3 4:4 5:5 6:6 7:7
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.br
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buffer-size 0:10Kb 1:10Kb 2:10Kb 3:10Kb 4:10Kb 5:10Kb 6:1Mb 7:10Kb
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.br
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total-size 1222Kb
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.SH EXIT STATUS
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Exit status is 0 if command was successful or a positive integer upon failure.
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.SH SEE ALSO
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.BR dcb (8)
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.SH REPORTING BUGS
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Report any bugs to the Network Developers mailing list
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.B <netdev@vger.kernel.org>
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where the development and maintenance is primarily done.
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You do not have to be subscribed to the list to send a message there.
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.SH AUTHOR
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Petr Machata <me@pmachata.org>
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@ -9,7 +9,7 @@ dcb \- show / manipulate DCB (Data Center Bridging) settings
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.ti -8
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.B dcb
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.RI "[ " OPTIONS " ] "
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.RB "{ " ets " | " pfc " }"
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.RB "{ " buffer " | " ets " | " pfc " }"
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.RI "{ " COMMAND " | " help " }"
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.sp
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@ -63,6 +63,10 @@ part of the "show" output.
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.SH OBJECTS
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.TP
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.B buffer
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- Configuration of port buffers
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.TP
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.B ets
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- Configuration of ETS (Enhanced Transmission Selection)
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@ -115,6 +119,7 @@ other values:
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Exit status is 0 if command was successful or a positive integer upon failure.
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.SH SEE ALSO
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.BR dcb-buffer (8),
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.BR dcb-ets (8),
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.BR dcb-pfc (8)
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.br
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