mdns: add configuration values for task priority, affinity and internal service timeouts

closes https://github.com/espressif/esp-idf/issues/4217

components/mdns/Kconfig

@@ -10,4 +10,52 @@ menu "mDNS"
             the maximum amount of services here. The valid value is from 1
             to 64.
 
+    config MDNS_TASK_PRIORITY
+        int "mDNS task priority"
+        range 1 255
+        default 1
+        help
+            Allows setting mDNS task priority. Please do not set the task priority
+            higher than priorities of system tasks. Compile time warning/error
+            would be emitted if the chosen task priority were too high.
+
+    choice MDNS_TASK_AFFINITY
+        prompt "mDNS task affinity"
+        default MDNS_TASK_AFFINITY_CPU0
+        help
+            Allows setting mDNS tasks affinity, i.e. whether the task is pinned to
+            CPU0, pinned to CPU1, or allowed to run on any CPU.
+
+        config MDNS_TASK_AFFINITY_NO_AFFINITY
+            bool "No affinity"
+        config MDNS_TASK_AFFINITY_CPU0
+            bool "CPU0"
+        config MDNS_TASK_AFFINITY_CPU1
+            bool "CPU1"
+            depends on !FREERTOS_UNICORE
+
+    endchoice
+
+    config MDNS_TASK_AFFINITY
+        hex
+        default FREERTOS_NO_AFFINITY if MDNS_TASK_AFFINITY_NO_AFFINITY
+        default 0x0 if MDNS_TASK_AFFINITY_CPU0
+        default 0x1 if MDNS_TASK_AFFINITY_CPU1
+
+    config MDNS_SERVICE_ADD_TIMEOUT_MS
+        int "mDNS adding service timeout (ms)"
+        range 10 30000
+        default 2000
+        help
+            Configures timeout for adding a new mDNS service. Adding a service
+            fails if could not be completed within this time.
+
+    config MDNS_TIMER_PERIOD_MS
+        int "mDNS timer period (ms)"
+        range 10 10000
+        default 100
+        help
+            Configures period of mDNS timer, which periodically transmits packets
+            and schedules mDNS searches.
+
 endmenu

components/mdns/mdns.c

@@ -17,6 +17,7 @@
 #include "mdns_networking.h"
 #include "esp_log.h"
 #include <string.h>
+#include <sys/param.h>
 
 #ifdef MDNS_ENABLE_DEBUG
 void mdns_debug_packet(const uint8_t * data, size_t len);
@@ -4095,7 +4096,8 @@ static esp_err_t _mdns_service_task_start(void)
         return ESP_FAIL;
     }
     if (!_mdns_service_task_handle) {
-        xTaskCreatePinnedToCore(_mdns_service_task, "mdns", MDNS_SERVICE_STACK_DEPTH, NULL, 1, (TaskHandle_t * const)(&_mdns_service_task_handle), 0);
+        xTaskCreatePinnedToCore(_mdns_service_task, "mdns", MDNS_SERVICE_STACK_DEPTH, NULL, MDNS_TASK_PRIORITY,
+                                (TaskHandle_t * const)(&_mdns_service_task_handle), MDNS_TASK_AFFINITY);
         if (!_mdns_service_task_handle) {
             _mdns_stop_timer();
             MDNS_SERVICE_UNLOCK();
@@ -4400,12 +4402,15 @@ esp_err_t mdns_service_add(const char * instance, const char * service, const ch
         return ESP_ERR_NO_MEM;
     }
 
-    uint8_t i = 0;
-    while (_mdns_get_service_item(service, proto) == NULL && i++ < 200) {
-        vTaskDelay(1);
-    }
-    if (i >= 200) {
-        return ESP_FAIL;
+    size_t start = xTaskGetTickCount();
+    size_t timeout_ticks = pdMS_TO_TICKS(MDNS_SERVICE_ADD_TIMEOUT_MS);
+    while (_mdns_get_service_item(service, proto) == NULL)
+    {
+        uint32_t expired = xTaskGetTickCount() - start;
+        if (expired >= timeout_ticks) {
+            return ESP_FAIL; // Timeout
+        }
+        vTaskDelay(MIN(10 / portTICK_RATE_MS, timeout_ticks - expired));
     }
 
     return ESP_OK;

components/mdns/private_include/mdns_private.h

@@ -56,6 +56,15 @@
 
 #define MDNS_SERVICE_PORT           5353                    // UDP port that the server runs on
 #define MDNS_SERVICE_STACK_DEPTH    4096                    // Stack size for the service thread
+#define MDNS_TASK_PRIORITY          CONFIG_MDNS_TASK_PRIORITY
+#if (MDNS_TASK_PRIORITY > ESP_TASK_PRIO_MAX)
+#error "mDNS task priority is higher than ESP_TASK_PRIO_MAX"
+#elif (MDNS_TASK_PRIORITY > ESP_TASKD_EVENT_PRIO)
+#warning "mDNS task priority is higher than ESP_TASKD_EVENT_PRIO, mDNS library might not work correctly"
+#endif
+#define MDNS_TASK_AFFINITY          CONFIG_MDNS_TASK_AFFINITY
+#define MDNS_SERVICE_ADD_TIMEOUT_MS CONFIG_MDNS_SERVICE_ADD_TIMEOUT_MS
+
 #define MDNS_PACKET_QUEUE_LEN       16                      // Maximum packets that can be queued for parsing
 #define MDNS_ACTION_QUEUE_LEN       16                      // Maximum actions pending to the server
 #define MDNS_TXT_MAX_LEN            1024                    // Maximum string length of text data in TXT record
@@ -82,7 +91,7 @@
 #define MDNS_SRV_PORT_OFFSET        4
 #define MDNS_SRV_FQDN_OFFSET        6
 
-#define MDNS_TIMER_PERIOD_US        100000
+#define MDNS_TIMER_PERIOD_US        (CONFIG_MDNS_TIMER_PERIOD_MS*1000)
 
 #define MDNS_SERVICE_LOCK()     xSemaphoreTake(_mdns_service_semaphore, portMAX_DELAY)
 #define MDNS_SERVICE_UNLOCK()   xSemaphoreGive(_mdns_service_semaphore)