gazelle/0103-add-thread-select-path.patch

From b61caf98b117313d1c2d59c1954d494901adcb73 Mon Sep 17 00:00:00 2001
From: wu-changsheng <wuchangsheng2@huawei.com>
Date: Sat, 8 Oct 2022 20:39:48 +0800
Subject: [PATCH 19/21] add thread select path

---
 src/lstack/api/lstack_wrap.c  | 14 ++++++---
 src/lstack/core/lstack_init.c | 54 +++++++++++++++++++++++++++++++++++
 2 files changed, 64 insertions(+), 4 deletions(-)

diff --git a/src/lstack/api/lstack_wrap.c b/src/lstack/api/lstack_wrap.c
index 296906e..d88513b 100644
--- a/src/lstack/api/lstack_wrap.c
+++ b/src/lstack/api/lstack_wrap.c
@@ -42,9 +42,11 @@ enum KERNEL_LWIP_PATH {
     PATH_UNKNOW,
 };
 
+bool select_thread_path(void);
+
 static enum KERNEL_LWIP_PATH select_path(int fd)
 {
-    if (posix_api == NULL) {
+    if (unlikely(posix_api == NULL)) {
         /* posix api maybe call before gazelle init */
         if (posix_api_init() != 0) {
             LSTACK_PRE_LOG(LSTACK_ERR, "posix_api_init failed\n");
@@ -52,6 +54,10 @@ static enum KERNEL_LWIP_PATH select_path(int fd)
         return PATH_KERNEL;
     }
 
+    if (!select_thread_path()) {
+        return PATH_KERNEL;
+    }
+
     if (unlikely(posix_api->ues_posix)) {
         return PATH_KERNEL;
     }
@@ -93,7 +99,7 @@ static inline int32_t do_epoll_create(int32_t size)
 
 static inline int32_t do_epoll_ctl(int32_t epfd, int32_t op, int32_t fd, struct epoll_event* event)
 {
-    if (unlikely(posix_api->ues_posix)) {
+    if (unlikely(posix_api->ues_posix) || !select_thread_path()) {
         return posix_api->epoll_ctl_fn(epfd, op, fd, event);
     }
 
@@ -102,7 +108,7 @@ static inline int32_t do_epoll_ctl(int32_t epfd, int32_t op, int32_t fd, struct
 
 static inline int32_t do_epoll_wait(int32_t epfd, struct epoll_event* events, int32_t maxevents, int32_t timeout)
 {
-    if (unlikely(posix_api->ues_posix)) {
+    if (unlikely(posix_api->ues_posix) || !select_thread_path()) {
         return posix_api->epoll_wait_fn(epfd, events, maxevents, timeout);
     }
 
@@ -369,7 +375,7 @@ static int32_t do_poll(struct pollfd *fds, nfds_t nfds, int32_t timeout)
         GAZELLE_RETURN(EINVAL);
     }
 
-    if (unlikely(posix_api->ues_posix) || nfds == 0) {
+    if (unlikely(posix_api->ues_posix) || nfds == 0 || !select_thread_path()) {
         return posix_api->poll_fn(fds, nfds, timeout);
     }
 
diff --git a/src/lstack/core/lstack_init.c b/src/lstack/core/lstack_init.c
index b1c69e6..f647b8e 100644
--- a/src/lstack/core/lstack_init.c
+++ b/src/lstack/core/lstack_init.c
@@ -48,8 +48,10 @@
 #define LSTACK_SO_NAME              "liblstack.so"
 #define LSTACK_PRELOAD_NAME_LEN     PATH_MAX
 #define LSTACK_PRELOAD_ENV_PROC     "GAZELLE_BIND_PROCNAME"
+#define LSTACK_ENV_THREAD           "GAZELLE_THREAD_NAME"
 
 static volatile bool g_init_fail = false;
+static PER_THREAD int32_t g_thread_path = -1;
 
 void set_init_fail(void)
 {
@@ -64,14 +66,34 @@ bool get_init_fail(void)
 struct lstack_preload {
     int32_t preload_switch;
     char env_procname[LSTACK_PRELOAD_NAME_LEN];
+    bool get_thread_name;
+    char env_threadname[LSTACK_PRELOAD_NAME_LEN];
 };
 static struct lstack_preload g_preload_info = {0};
 
+static void get_select_thread_name(void)
+{
+    g_preload_info.get_thread_name = true;
+
+    char *enval = NULL;
+    enval = getenv(LSTACK_ENV_THREAD);
+    if (enval == NULL) {
+        return;
+    }
+    if (strcpy_s(g_preload_info.env_threadname, LSTACK_PRELOAD_NAME_LEN, enval) != EOK) {
+        return;
+    }
+
+    LSTACK_PRE_LOG(LSTACK_INFO, "thread name=%s ok\n", g_preload_info.env_threadname);
+}
+
 static int32_t preload_info_init(void)
 {
     char *enval = NULL;
 
     g_preload_info.preload_switch = 0;
+    
+    get_select_thread_name();
 
     enval = getenv(LSTACK_PRELOAD_ENV_SYS);
     if (enval == NULL) {
@@ -91,9 +113,41 @@ static int32_t preload_info_init(void)
     }
 
     g_preload_info.preload_switch = 1;
+    LSTACK_PRE_LOG(LSTACK_INFO, "LD_PRELOAD ok\n");
     return 0;
 }
 
+bool select_thread_path(void)
+{
+    if (g_thread_path >= 0) {
+        return g_thread_path;
+    }
+
+    if (!g_preload_info.get_thread_name) {
+        get_select_thread_name();
+    }
+
+    /* not set GAZELLE_THREAD_NAME, select all thread */
+    if (g_preload_info.env_threadname[0] == '\0') {
+        g_thread_path = 1;
+        return true;
+    }
+
+    char thread_name[PATH_MAX] = {0};
+    if (pthread_getname_np(pthread_self(), thread_name, PATH_MAX) != 0) {
+        g_thread_path = 0;
+        return false;
+    }
+
+    if (strstr(thread_name, g_preload_info.env_threadname) == NULL) {
+        g_thread_path = 0;
+        return false;
+    }
+
+    g_thread_path = 1;
+    return true;
+}
+
 static int32_t check_process_conflict(void)
 {
     int32_t ret;
-- 
2.23.0