[dpdk-dev] [PATCH v9 16/20] ctrl_if: initialize netlink interface

Ferruh Yigit ferruh.yigit at intel.com
Fri Jun 30 18:51:36 CEST 2017


Initialize netlink sockets to exchange data between kernelspace.

Signed-off-by: Ferruh Yigit <ferruh.yigit at intel.com>
---
 lib/librte_ctrl_if/Makefile      |   2 +
 lib/librte_ctrl_if/rte_ctrl_if.c |   9 +++
 lib/librte_ctrl_if/rte_nl.c      | 158 +++++++++++++++++++++++++++++++++++++++
 lib/librte_ctrl_if/rte_nl.h      |  48 ++++++++++++
 4 files changed, 217 insertions(+)
 create mode 100644 lib/librte_ctrl_if/rte_nl.c
 create mode 100644 lib/librte_ctrl_if/rte_nl.h

diff --git a/lib/librte_ctrl_if/Makefile b/lib/librte_ctrl_if/Makefile
index c682af4c4..0da04f7d0 100644
--- a/lib/librte_ctrl_if/Makefile
+++ b/lib/librte_ctrl_if/Makefile
@@ -38,12 +38,14 @@ LIB = librte_ctrl_if.a
 
 CFLAGS += -O3
 CFLAGS += $(WERROR_FLAGS)
+LDLIBS += -lpthread
 
 EXPORT_MAP := rte_ctrl_if_version.map
 
 LIBABIVER := 1
 
 SRCS-$(CONFIG_RTE_LIBRTE_CTRL_IF) := rte_ctrl_if.c
+SRCS-$(CONFIG_RTE_LIBRTE_CTRL_IF) += rte_nl.c
 
 #
 # Export include files
diff --git a/lib/librte_ctrl_if/rte_ctrl_if.c b/lib/librte_ctrl_if/rte_ctrl_if.c
index 8b0718969..a26699be7 100644
--- a/lib/librte_ctrl_if/rte_ctrl_if.c
+++ b/lib/librte_ctrl_if/rte_ctrl_if.c
@@ -44,6 +44,7 @@
 
 #include <rte_log.h>
 #include "rte_ctrl_if.h"
+#include "rte_nl.h"
 
 #define NAMESZ 32
 #define IFNAME "dpdk"
@@ -95,6 +96,13 @@ control_interface_init(void)
 		return -1;
 	}
 
+	ret = control_interface_nl_init();
+	if (ret < 0) {
+		RTE_LOG(ERR, CTRL_IF, "Failed to initialize netlink\n");
+		close(unci_rtnl_fd);
+		unci_rtnl_fd = -1;
+	}
+
 	return ret;
 }
 
@@ -119,6 +127,7 @@ static void
 control_interface_release(void)
 {
 	close(unci_rtnl_fd);
+	control_interface_nl_release();
 }
 
 static int
diff --git a/lib/librte_ctrl_if/rte_nl.c b/lib/librte_ctrl_if/rte_nl.c
new file mode 100644
index 000000000..e88b3fc91
--- /dev/null
+++ b/lib/librte_ctrl_if/rte_nl.c
@@ -0,0 +1,158 @@
+/*-
+ *   BSD LICENSE
+ *
+ *   Copyright(c) 2017 Intel Corporation. All rights reserved.
+ *   All rights reserved.
+ *
+ *   Redistribution and use in source and binary forms, with or without
+ *   modification, are permitted provided that the following conditions
+ *   are met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ *       notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above copyright
+ *       notice, this list of conditions and the following disclaimer in
+ *       the documentation and/or other materials provided with the
+ *       distribution.
+ *     * Neither the name of Intel Corporation nor the names of its
+ *       contributors may be used to endorse or promote products derived
+ *       from this software without specific prior written permission.
+ *
+ *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ *   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ *   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ *   A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ *   OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ *   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ *   LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ *   DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ *   THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ *   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <string.h>
+#include <unistd.h>
+
+#include <sys/socket.h>
+#include <linux/netlink.h>
+
+#include <rte_spinlock.h>
+#include <rte_log.h>
+#include "rte_nl.h"
+#include "rte_ctrl_if.h"
+
+#define MAX_PAYLOAD sizeof(struct unci_nl_msg)
+
+struct ctrl_if_nl {
+	union {
+		struct nlmsghdr nlh;
+		uint8_t nlmsg[NLMSG_SPACE(MAX_PAYLOAD)];
+	};
+	struct msghdr msg;
+	struct iovec iov;
+	struct sockaddr_nl dest_addr;
+};
+
+static int sock_fd = -1;
+static pthread_t thread_id;
+
+static struct ctrl_if_nl nl_s;
+static struct ctrl_if_nl nl_r;
+
+static void *
+nl_recv(void *arg)
+{
+	int ret;
+
+	for (;;) {
+		ret = recvmsg(sock_fd, &nl_r.msg, 0);
+		if (ret < 0)
+			continue;
+
+		if ((unsigned int)ret < sizeof(struct unci_nl_msg)) {
+			RTE_LOG(WARNING, CTRL_IF,
+					"Received %d bytes, payload %zu\n",
+					ret, sizeof(struct unci_nl_msg));
+			continue;
+		}
+	}
+
+	return arg;
+}
+
+static void
+nl_setup_header(struct ctrl_if_nl *nl)
+{
+	nl->dest_addr.nl_family = AF_NETLINK;
+	nl->dest_addr.nl_pid = 0;   /*  For Linux Kernel */
+	nl->dest_addr.nl_groups = 0;
+
+	memset(nl->nlmsg, 0, NLMSG_SPACE(MAX_PAYLOAD));
+
+	/* Fill the netlink message header */
+	nl->nlh.nlmsg_len = NLMSG_LENGTH(MAX_PAYLOAD);
+	nl->nlh.nlmsg_pid = getpid();  /* self pid */
+	nl->nlh.nlmsg_flags = 0;
+
+	nl->iov.iov_base = (void *)nl->nlmsg;
+	nl->iov.iov_len = nl->nlh.nlmsg_len;
+	memset(&nl->msg, 0, sizeof(struct msghdr));
+	nl->msg.msg_name = (void *)&nl->dest_addr;
+	nl->msg.msg_namelen = sizeof(struct sockaddr_nl);
+	nl->msg.msg_iov = &nl->iov;
+	nl->msg.msg_iovlen = 1;
+}
+
+static int
+nl_socket_init(void)
+{
+	struct sockaddr_nl src_addr;
+	int fd;
+	int ret;
+
+	fd = socket(PF_NETLINK, SOCK_RAW, UNCI_NL_GRP);
+	if (fd < 0)
+		return -1;
+
+	src_addr.nl_family = AF_NETLINK;
+	src_addr.nl_pid = getpid();
+	ret = bind(fd, (struct sockaddr *)&src_addr, sizeof(src_addr));
+	if (ret) {
+		close(fd);
+		return -1;
+	}
+
+	nl_setup_header(&nl_s);
+	nl_setup_header(&nl_r);
+
+	return fd;
+}
+
+int
+control_interface_nl_init(void)
+{
+	int ret;
+
+	sock_fd = nl_socket_init();
+	if (sock_fd < 0) {
+		RTE_LOG(ERR, CTRL_IF, "Failed to initialize netlink socket\n");
+		return -1;
+	}
+
+	ret = pthread_create(&thread_id, NULL, nl_recv, NULL);
+	if (ret != 0) {
+		RTE_LOG(ERR, CTRL_IF, "Failed to create receive thread\n");
+		return -1;
+	}
+
+	return 0;
+}
+
+void
+control_interface_nl_release(void)
+{
+	pthread_cancel(thread_id);
+	pthread_join(thread_id, NULL);
+	close(sock_fd);
+}
diff --git a/lib/librte_ctrl_if/rte_nl.h b/lib/librte_ctrl_if/rte_nl.h
new file mode 100644
index 000000000..05a61e193
--- /dev/null
+++ b/lib/librte_ctrl_if/rte_nl.h
@@ -0,0 +1,48 @@
+/*-
+ *   BSD LICENSE
+ *
+ *   Copyright(c) 2017 Intel Corporation. All rights reserved.
+ *   All rights reserved.
+ *
+ *   Redistribution and use in source and binary forms, with or without
+ *   modification, are permitted provided that the following conditions
+ *   are met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ *       notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above copyright
+ *       notice, this list of conditions and the following disclaimer in
+ *       the documentation and/or other materials provided with the
+ *       distribution.
+ *     * Neither the name of Intel Corporation nor the names of its
+ *       contributors may be used to endorse or promote products derived
+ *       from this software without specific prior written permission.
+ *
+ *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ *   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ *   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ *   A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ *   OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ *   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ *   LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ *   DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ *   THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ *   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef _RTE_NL_H_
+#define _RTE_NL_H_
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+int control_interface_nl_init(void);
+void control_interface_nl_release(void);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* _RTE_NL_H_ */
-- 
2.13.0



More information about the dev mailing list