support writev/readv socket api, fix epollout and tcp timestamp issue

Author: bluenet13

ans/ans_main.c

@@ -936,7 +936,7 @@ int main(int argc, char **argv)
     printf("core mask: %x, sockets number:%d, lcore number:%d \n", ans_user_conf.lcore_mask, ans_user_conf.socket_nb, ans_user_conf.lcore_nb);
 
     printf("start to init ans \n");
-    init_conf.max_sock_conn = ans_user_conf.lcore_nb * 64 * 1024;
+    init_conf.max_sock_conn = ans_user_conf.lcore_nb * 128 * 1024;
 
     init_conf.lcore_mask = ans_user_conf.lcore_mask;
     for(i = 0 ; i < MAX_NB_SOCKETS; i++)

librte_ans/librte_ans.a

@@ -134,6 +134,19 @@ ssize_t anssock_send(int sockfd, const void *buf, size_t len, int flags);
  */
 ssize_t anssock_write(int fd, const void *buf, size_t count);
 
+/**
+ *  Writes iovcnt buffers of data described by iov to the file associated with the file descriptor fd ("gather output").
+ *  Write user data via socket. This is nonblocking function, so shall check EAGAIN.
+ *
+ * @param       
+ * @param 
+ *
+ * @return  
+ *  On success, these calls return the number of characters sent.  On error, -1 is returned, and errno is set appropriately.
+ *   If errno is EAGAIN, no buffer for sending data.
+ */
+ssize_t anssock_writev(int fd, const struct iovec *iov, int iovcnt);
+
 /**
  * Receive user data from socket. This function is designed as nonblocking function, so shall not set socket as nonblocking and work with epoll.
  *
@@ -173,6 +186,19 @@ ssize_t anssock_recv(int sockfd, void *buf, size_t len, int flags);
  */ 
 ssize_t anssock_read(int fd, void *buf, size_t count);
 
+
+/**
+ * Reads iovcnt buffers from the file associated with the file descriptor fd into the buffers described by iov ("scatter input").
+ *
+ * @param       
+ * @param 
+ *
+ * @return  
+ *  These calls return the number of bytes received, or -1 if an error occurred.  In the event of an error, errno is set to indicate the error.  
+ *  If errno is EAGAIN, no data are present to be received.
+ */ 
+ssize_t anssock_readv(int fd, const struct iovec *iov, int iovcnt);
+
 /**
  * Listen for connections on a socket
  *