X-Git-Url: http://git.droids-corp.org/?a=blobdiff_plain;f=lib%2Flibrte_power%2Fguest_channel.c;h=7b5926e5c45d03541bdc9ae26f708fb1bf3dab16;hb=9298fa5cacb4f9f38261094bb13ca4eac4220c81;hp=9cf7d2cb246ccd27533b4f82e737e7f29373aa70;hpb=b4b2f84a5970709e7fb060e3bcd4afb7c19b0121;p=dpdk.git

diff --git a/lib/librte_power/guest_channel.c b/lib/librte_power/guest_channel.c
index 9cf7d2cb24..7b5926e5c4 100644
--- a/lib/librte_power/guest_channel.c
+++ b/lib/librte_power/guest_channel.c
@@ -2,6 +2,7 @@
  * Copyright(c) 2010-2014 Intel Corporation
  */
 
+#include <glob.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <unistd.h>
@@ -10,6 +11,7 @@
 #include <fcntl.h>
 #include <string.h>
 #include <errno.h>
+#include <poll.h>
 
 
 #include <rte_log.h>
@@ -19,8 +21,36 @@
 
 #define RTE_LOGTYPE_GUEST_CHANNEL RTE_LOGTYPE_USER1
 
+/* Timeout for incoming message in milliseconds. */
+#define TIMEOUT 10
+
 static int global_fds[RTE_MAX_LCORE] = { [0 ... RTE_MAX_LCORE-1] = -1 };
 
+int
+guest_channel_host_check_exists(const char *path)
+{
+	char glob_path[PATH_MAX];
+	glob_t g;
+	int ret;
+
+	/* we cannot know in advance which cores have VM channels, so glob */
+	snprintf(glob_path, PATH_MAX, "%s.*", path);
+
+	ret = glob(glob_path, GLOB_NOSORT, NULL, &g);
+	if (ret != 0) {
+		/* couldn't read anything */
+		ret = 0;
+		goto out;
+	}
+
+	/* do we have at least one match? */
+	ret = g.gl_pathc > 0;
+
+out:
+	globfree(&g);
+	return ret;
+}
+
 int
 guest_channel_host_connect(const char *path, unsigned int lcore_id)
 {
@@ -125,6 +155,67 @@ int rte_power_guest_channel_send_msg(struct channel_packet *pkt,
 	return guest_channel_send_msg(pkt, lcore_id);
 }
 
+int power_guest_channel_read_msg(void *pkt,
+		size_t pkt_len,
+		unsigned int lcore_id)
+{
+	int ret;
+	struct pollfd fds;
+
+	if (pkt_len == 0 || pkt == NULL)
+		return -1;
+
+	fds.fd = global_fds[lcore_id];
+	fds.events = POLLIN;
+
+	ret = poll(&fds, 1, TIMEOUT);
+	if (ret == 0) {
+		RTE_LOG(DEBUG, GUEST_CHANNEL, "Timeout occurred during poll function.\n");
+		return -1;
+	} else if (ret < 0) {
+		RTE_LOG(ERR, GUEST_CHANNEL, "Error occurred during poll function: %s\n",
+				strerror(errno));
+		return -1;
+	}
+
+	if (lcore_id >= RTE_MAX_LCORE) {
+		RTE_LOG(ERR, GUEST_CHANNEL, "Channel(%u) is out of range 0...%d\n",
+				lcore_id, RTE_MAX_LCORE-1);
+		return -1;
+	}
+
+	if (global_fds[lcore_id] < 0) {
+		RTE_LOG(ERR, GUEST_CHANNEL, "Channel is not connected\n");
+		return -1;
+	}
+
+	while (pkt_len > 0) {
+		ret = read(global_fds[lcore_id],
+				pkt, pkt_len);
+
+		if (ret < 0) {
+			if (errno == EINTR)
+				continue;
+			return -1;
+		}
+
+		if (ret == 0) {
+			RTE_LOG(ERR, GUEST_CHANNEL, "Expected more data, but connection has been closed.\n");
+			return -1;
+		}
+		pkt = (char *)pkt + ret;
+		pkt_len -= ret;
+	}
+
+	return 0;
+}
+
+int rte_power_guest_channel_receive_msg(void *pkt,
+		size_t pkt_len,
+		unsigned int lcore_id)
+{
+	return power_guest_channel_read_msg(pkt, pkt_len, lcore_id);
+}
 
 void
 guest_channel_host_disconnect(unsigned int lcore_id)