Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / drivers / staging / gdm72xx / netlink_k.c

diff --git a/kernel/drivers/staging/gdm72xx/netlink_k.c b/kernel/drivers/staging/gdm72xx/netlink_k.c
new file mode 100644 (file)
index 0000000..9d78bfc
--- /dev/null
+++ b/kernel/drivers/staging/gdm72xx/netlink_k.c
@@ -0,0 +1,156 @@
+/*
+ * Copyright (c) 2012 GCT Semiconductor, Inc. All rights reserved.
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/module.h>
+#include <linux/etherdevice.h>
+#include <net/netlink.h>
+#include <asm/byteorder.h>
+#include <net/sock.h>
+#include "netlink_k.h"
+
+#if !defined(NLMSG_HDRLEN)
+#define NLMSG_HDRLEN    ((int) NLMSG_ALIGN(sizeof(struct nlmsghdr)))
+#endif
+
+#define ND_MAX_GROUP                   30
+#define ND_IFINDEX_LEN                 sizeof(int)
+#define ND_NLMSG_SPACE(len)            (nlmsg_total_size(len) + ND_IFINDEX_LEN)
+#define ND_NLMSG_DATA(nlh) \
+       ((void *)((char *)nlmsg_data(nlh) + ND_IFINDEX_LEN))
+#define ND_NLMSG_S_LEN(len)            (len+ND_IFINDEX_LEN)
+#define ND_NLMSG_R_LEN(nlh)            (nlh->nlmsg_len-ND_IFINDEX_LEN)
+#define ND_NLMSG_IFIDX(nlh)            nlmsg_data(nlh)
+#define ND_MAX_MSG_LEN                 8096
+
+#if defined(DEFINE_MUTEX)
+static DEFINE_MUTEX(netlink_mutex);
+#else
+static struct semaphore netlink_mutex;
+#define mutex_lock(x)          down(x)
+#define mutex_unlock(x)                up(x)
+#endif
+
+static void (*rcv_cb)(struct net_device *dev, u16 type, void *msg, int len);
+
+static void netlink_rcv_cb(struct sk_buff *skb)
+{
+       struct nlmsghdr *nlh;
+       struct net_device *dev;
+       u32 mlen;
+       void *msg;
+       int ifindex;
+
+       if (skb->len >= NLMSG_HDRLEN) {
+               nlh = (struct nlmsghdr *)skb->data;
+
+               if (skb->len < nlh->nlmsg_len ||
+                   nlh->nlmsg_len > ND_MAX_MSG_LEN) {
+                       netdev_err(skb->dev, "Invalid length (%d,%d)\n",
+                                  skb->len, nlh->nlmsg_len);
+                       return;
+               }
+
+               memcpy(&ifindex, ND_NLMSG_IFIDX(nlh), ND_IFINDEX_LEN);
+               msg = ND_NLMSG_DATA(nlh);
+               mlen = ND_NLMSG_R_LEN(nlh);
+
+               if (rcv_cb) {
+                       dev = dev_get_by_index(&init_net, ifindex);
+                       if (dev) {
+                               rcv_cb(dev, nlh->nlmsg_type, msg, mlen);
+                               dev_put(dev);
+                       } else
+                               netdev_err(skb->dev,
+                                          "dev_get_by_index(%d) is not found.\n",
+                                          ifindex);
+               } else {
+                       netdev_err(skb->dev, "Unregistered Callback\n");
+               }
+       }
+}
+
+static void netlink_rcv(struct sk_buff *skb)
+{
+       mutex_lock(&netlink_mutex);
+       netlink_rcv_cb(skb);
+       mutex_unlock(&netlink_mutex);
+}
+
+struct sock *netlink_init(int unit, void (*cb)(struct net_device *dev, u16 type,
+                                              void *msg, int len))
+{
+       struct sock *sock;
+       struct netlink_kernel_cfg cfg = {
+               .input  = netlink_rcv,
+       };
+
+#if !defined(DEFINE_MUTEX)
+       init_MUTEX(&netlink_mutex);
+#endif
+
+       sock = netlink_kernel_create(&init_net, unit, &cfg);
+
+       if (sock)
+               rcv_cb = cb;
+
+       return sock;
+}
+
+void netlink_exit(struct sock *sock)
+{
+       netlink_kernel_release(sock);
+}
+
+int netlink_send(struct sock *sock, int group, u16 type, void *msg, int len)
+{
+       static u32 seq;
+       struct sk_buff *skb = NULL;
+       struct nlmsghdr *nlh;
+       int ret = 0;
+
+       if (group > ND_MAX_GROUP) {
+               pr_err("Group %d is invalied.\n", group);
+               pr_err("Valid group is 0 ~ %d.\n", ND_MAX_GROUP);
+               return -EINVAL;
+       }
+
+       skb = nlmsg_new(len, GFP_ATOMIC);
+       if (!skb) {
+               pr_err("netlink_broadcast ret=%d\n", ret);
+               return -ENOMEM;
+       }
+
+       seq++;
+       nlh = nlmsg_put(skb, 0, seq, type, len, 0);
+       if (!nlh) {
+               kfree_skb(skb);
+               return -EMSGSIZE;
+       }
+       memcpy(nlmsg_data(nlh), msg, len);
+
+       NETLINK_CB(skb).portid = 0;
+       NETLINK_CB(skb).dst_group = 0;
+
+       ret = netlink_broadcast(sock, skb, 0, group+1, GFP_ATOMIC);
+
+       if (!ret)
+               return len;
+       if (ret != -ESRCH) {
+               pr_err("netlink_broadcast g=%d, t=%d, l=%d, r=%d\n",
+                      group, type, len, ret);
+       }
+       ret = 0;
+       return ret;
+}