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net_tc.c
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net_tc.c
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/*
* Copyright (c) 2018 Intel Corporation.
*
* SPDX-License-Identifier: Apache-2.0
*/
#include <zephyr/logging/log.h>
LOG_MODULE_REGISTER(net_tc, CONFIG_NET_TC_LOG_LEVEL);
#include <zephyr/kernel.h>
#include <string.h>
#include <zephyr/net/net_core.h>
#include <zephyr/net/net_pkt.h>
#include <zephyr/net/net_stats.h>
#include "net_private.h"
#include "net_stats.h"
#include "net_tc_mapping.h"
/* Template for thread name. The "xx" is either "TX" denoting transmit thread,
* or "RX" denoting receive thread. The "q[y]" denotes the traffic class queue
* where y indicates the traffic class id. The value of y can be from 0 to 7.
*/
#define MAX_NAME_LEN sizeof("xx_q[y]")
/* Stacks for TX work queue */
K_KERNEL_STACK_ARRAY_DEFINE(tx_stack, NET_TC_TX_COUNT,
CONFIG_NET_TX_STACK_SIZE);
/* Stacks for RX work queue */
K_KERNEL_STACK_ARRAY_DEFINE(rx_stack, NET_TC_RX_COUNT,
CONFIG_NET_RX_STACK_SIZE);
#if NET_TC_TX_COUNT > 0
static struct net_traffic_class tx_classes[NET_TC_TX_COUNT];
#endif
#if NET_TC_RX_COUNT > 0
static struct net_traffic_class rx_classes[NET_TC_RX_COUNT];
#endif
#if NET_TC_RX_COUNT > 0 || NET_TC_TX_COUNT > 0
static void submit_to_queue(struct k_fifo *queue, struct net_pkt *pkt)
{
k_fifo_put(queue, pkt);
}
#endif
bool net_tc_submit_to_tx_queue(uint8_t tc, struct net_pkt *pkt)
{
#if NET_TC_TX_COUNT > 0
net_pkt_set_tx_stats_tick(pkt, k_cycle_get_32());
submit_to_queue(&tx_classes[tc].fifo, pkt);
#else
ARG_UNUSED(tc);
ARG_UNUSED(pkt);
#endif
return true;
}
void net_tc_submit_to_rx_queue(uint8_t tc, struct net_pkt *pkt)
{
#if NET_TC_RX_COUNT > 0
net_pkt_set_rx_stats_tick(pkt, k_cycle_get_32());
submit_to_queue(&rx_classes[tc].fifo, pkt);
#else
ARG_UNUSED(tc);
ARG_UNUSED(pkt);
#endif
}
int net_tx_priority2tc(enum net_priority prio)
{
#if NET_TC_TX_COUNT > 0
if (prio > NET_PRIORITY_NC) {
/* Use default value suggested in 802.1Q */
prio = NET_PRIORITY_BE;
}
return tx_prio2tc_map[prio];
#else
ARG_UNUSED(prio);
return 0;
#endif
}
int net_rx_priority2tc(enum net_priority prio)
{
#if NET_TC_RX_COUNT > 0
if (prio > NET_PRIORITY_NC) {
/* Use default value suggested in 802.1Q */
prio = NET_PRIORITY_BE;
}
return rx_prio2tc_map[prio];
#else
ARG_UNUSED(prio);
return 0;
#endif
}
#if IS_ENABLED(CONFIG_NET_TC_THREAD_COOPERATIVE)
#define BASE_PRIO_TX (CONFIG_NET_TC_NUM_PRIORITIES - 1)
#else
#define BASE_PRIO_TX (CONFIG_NET_TC_TX_COUNT - 1)
#endif
#define PRIO_TX(i, _) (BASE_PRIO_TX - i)
#if IS_ENABLED(CONFIG_NET_TC_THREAD_COOPERATIVE)
#define BASE_PRIO_RX (CONFIG_NET_TC_NUM_PRIORITIES - 1)
#else
#define BASE_PRIO_RX (CONFIG_NET_TC_RX_COUNT - 1)
#endif
#define PRIO_RX(i, _) (BASE_PRIO_RX - i)
#if NET_TC_TX_COUNT > 0
/* Convert traffic class to thread priority */
static uint8_t tx_tc2thread(uint8_t tc)
{
/* Initial implementation just maps the traffic class to certain queue.
* If there are less queues than classes, then map them into
* some specific queue.
*
* Lower value in this table means higher thread priority. The
* value is used as a parameter to K_PRIO_COOP() or K_PRIO_PREEMPT()
* which converts it to actual thread priority.
*
* Higher traffic class value means higher priority queue. This means
* that thread_priorities[7] value should contain the highest priority
* for the TX queue handling thread.
*
* For example, if NET_TC_TX_COUNT = 8, which is the maximum number of
* traffic classes, then this priority array will contain following
* values if preemptive priorities are used:
* 7, 6, 5, 4, 3, 2, 1, 0
* and
* 14, 13, 12, 11, 10, 9, 8, 7
* if cooperative priorities are used.
*
* Then these will be converted to following thread priorities if
* CONFIG_NET_TC_THREAD_COOPERATIVE is enabled:
* -1, -2, -3, -4, -5, -6, -7, -8
*
* and if CONFIG_NET_TC_THREAD_PREEMPTIVE is enabled, following thread
* priorities are used:
* 7, 6, 5, 4, 3, 2, 1, 0
*
* This means that the lowest traffic class 1, will have the lowest
* cooperative priority -1 for coop priorities and 7 for preemptive
* priority.
*/
static const uint8_t thread_priorities[] = {
LISTIFY(NET_TC_TX_COUNT, PRIO_TX, (,))
};
BUILD_ASSERT(NET_TC_TX_COUNT <= CONFIG_NUM_COOP_PRIORITIES,
"Too many traffic classes");
NET_ASSERT(tc < ARRAY_SIZE(thread_priorities));
return thread_priorities[tc];
}
#endif
#if NET_TC_RX_COUNT > 0
/* Convert traffic class to thread priority */
static uint8_t rx_tc2thread(uint8_t tc)
{
static const uint8_t thread_priorities[] = {
LISTIFY(NET_TC_RX_COUNT, PRIO_RX, (,))
};
BUILD_ASSERT(NET_TC_RX_COUNT <= CONFIG_NUM_COOP_PRIORITIES,
"Too many traffic classes");
NET_ASSERT(tc < ARRAY_SIZE(thread_priorities));
return thread_priorities[tc];
}
#endif
#if defined(CONFIG_NET_STATISTICS)
/* Fixup the traffic class statistics so that "net stats" shell command will
* print output correctly.
*/
#if NET_TC_TX_COUNT > 0
static void tc_tx_stats_priority_setup(struct net_if *iface)
{
int i;
for (i = 0; i < 8; i++) {
net_stats_update_tc_sent_priority(iface, net_tx_priority2tc(i),
i);
}
}
#endif
#if NET_TC_RX_COUNT > 0
static void tc_rx_stats_priority_setup(struct net_if *iface)
{
int i;
for (i = 0; i < 8; i++) {
net_stats_update_tc_recv_priority(iface, net_rx_priority2tc(i),
i);
}
}
#endif
#if NET_TC_TX_COUNT > 0
static void net_tc_tx_stats_priority_setup(struct net_if *iface,
void *user_data)
{
ARG_UNUSED(user_data);
tc_tx_stats_priority_setup(iface);
}
#endif
#if NET_TC_RX_COUNT > 0
static void net_tc_rx_stats_priority_setup(struct net_if *iface,
void *user_data)
{
ARG_UNUSED(user_data);
tc_rx_stats_priority_setup(iface);
}
#endif
#endif
#if NET_TC_RX_COUNT > 0
static void tc_rx_handler(struct k_fifo *fifo)
{
struct net_pkt *pkt;
while (1) {
pkt = k_fifo_get(fifo, K_FOREVER);
if (pkt == NULL) {
continue;
}
net_process_rx_packet(pkt);
}
}
#endif
#if NET_TC_TX_COUNT > 0
static void tc_tx_handler(struct k_fifo *fifo)
{
struct net_pkt *pkt;
while (1) {
pkt = k_fifo_get(fifo, K_FOREVER);
if (pkt == NULL) {
continue;
}
net_process_tx_packet(pkt);
}
}
#endif
/* Create a fifo for each traffic class we are using. All the network
* traffic goes through these classes.
*/
void net_tc_tx_init(void)
{
#if NET_TC_TX_COUNT == 0
NET_DBG("No %s thread created", "TX");
return;
#else
int i;
BUILD_ASSERT(NET_TC_TX_COUNT >= 0);
#if defined(CONFIG_NET_STATISTICS)
net_if_foreach(net_tc_tx_stats_priority_setup, NULL);
#endif
for (i = 0; i < NET_TC_TX_COUNT; i++) {
uint8_t thread_priority;
int priority;
k_tid_t tid;
thread_priority = tx_tc2thread(i);
priority = IS_ENABLED(CONFIG_NET_TC_THREAD_COOPERATIVE) ?
K_PRIO_COOP(thread_priority) :
K_PRIO_PREEMPT(thread_priority);
NET_DBG("[%d] Starting TX handler %p stack size %zd "
"prio %d %s(%d)", i,
&tx_classes[i].handler,
K_KERNEL_STACK_SIZEOF(tx_stack[i]),
thread_priority,
IS_ENABLED(CONFIG_NET_TC_THREAD_COOPERATIVE) ?
"coop" : "preempt",
priority);
k_fifo_init(&tx_classes[i].fifo);
tid = k_thread_create(&tx_classes[i].handler, tx_stack[i],
K_KERNEL_STACK_SIZEOF(tx_stack[i]),
(k_thread_entry_t)tc_tx_handler,
&tx_classes[i].fifo, NULL, NULL,
priority, 0, K_FOREVER);
if (!tid) {
NET_ERR("Cannot create TC handler thread %d", i);
continue;
}
if (IS_ENABLED(CONFIG_THREAD_NAME)) {
char name[MAX_NAME_LEN];
snprintk(name, sizeof(name), "tx_q[%d]", i);
k_thread_name_set(tid, name);
}
k_thread_start(tid);
}
#endif
}
void net_tc_rx_init(void)
{
#if NET_TC_RX_COUNT == 0
NET_DBG("No %s thread created", "RX");
return;
#else
int i;
BUILD_ASSERT(NET_TC_RX_COUNT >= 0);
#if defined(CONFIG_NET_STATISTICS)
net_if_foreach(net_tc_rx_stats_priority_setup, NULL);
#endif
for (i = 0; i < NET_TC_RX_COUNT; i++) {
uint8_t thread_priority;
int priority;
k_tid_t tid;
thread_priority = rx_tc2thread(i);
priority = IS_ENABLED(CONFIG_NET_TC_THREAD_COOPERATIVE) ?
K_PRIO_COOP(thread_priority) :
K_PRIO_PREEMPT(thread_priority);
NET_DBG("[%d] Starting RX handler %p stack size %zd "
"prio %d %s(%d)", i,
&rx_classes[i].handler,
K_KERNEL_STACK_SIZEOF(rx_stack[i]),
thread_priority,
IS_ENABLED(CONFIG_NET_TC_THREAD_COOPERATIVE) ?
"coop" : "preempt",
priority);
k_fifo_init(&rx_classes[i].fifo);
tid = k_thread_create(&rx_classes[i].handler, rx_stack[i],
K_KERNEL_STACK_SIZEOF(rx_stack[i]),
(k_thread_entry_t)tc_rx_handler,
&rx_classes[i].fifo, NULL, NULL,
priority, 0, K_FOREVER);
if (!tid) {
NET_ERR("Cannot create TC handler thread %d", i);
continue;
}
if (IS_ENABLED(CONFIG_THREAD_NAME)) {
char name[MAX_NAME_LEN];
snprintk(name, sizeof(name), "rx_q[%d]", i);
k_thread_name_set(tid, name);
}
k_thread_start(tid);
}
#endif
}