]> git.proxmox.com Git - mirror_ubuntu-hirsute-kernel.git/commitdiff
ethtool: add default notification handler
authorMichal Kubecek <mkubecek@suse.cz>
Fri, 27 Dec 2019 14:55:58 +0000 (15:55 +0100)
committerDavid S. Miller <davem@davemloft.net>
Sat, 28 Dec 2019 00:40:02 +0000 (16:40 -0800)
The ethtool netlink notifications have the same format as related GET
replies so that if generic GET handling framework is used to process GET
requests, its callbacks and instance of struct get_request_ops can be
also used to compose corresponding notification message.

Provide function ethnl_std_notify() to be used as notification handler in
ethnl_notify_handlers table.

Signed-off-by: Michal Kubecek <mkubecek@suse.cz>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
net/ethtool/netlink.c
net/ethtool/netlink.h

index 7867425956f69b12af94ab355bddd6856e337c89..057b67f8ba8ca42d34aa327a3194336fde3ddcf6 100644 (file)
@@ -7,6 +7,7 @@
 static struct genl_family ethtool_genl_family;
 
 static bool ethnl_ok __read_mostly;
+static u32 ethnl_bcast_seq;
 
 static const struct nla_policy ethnl_header_policy[ETHTOOL_A_HEADER_MAX + 1] = {
        [ETHTOOL_A_HEADER_UNSPEC]       = { .type = NLA_REJECT },
@@ -171,6 +172,18 @@ err:
        return NULL;
 }
 
+static void *ethnl_bcastmsg_put(struct sk_buff *skb, u8 cmd)
+{
+       return genlmsg_put(skb, 0, ++ethnl_bcast_seq, &ethtool_genl_family, 0,
+                          cmd);
+}
+
+static int ethnl_multicast(struct sk_buff *skb, struct net_device *dev)
+{
+       return genlmsg_multicast_netns(&ethtool_genl_family, dev_net(dev), skb,
+                                      0, ETHNL_MCGRP_MONITOR, GFP_KERNEL);
+}
+
 /* GET request helpers */
 
 /**
@@ -494,6 +507,82 @@ static int ethnl_default_done(struct netlink_callback *cb)
        return 0;
 }
 
+static const struct ethnl_request_ops *
+ethnl_default_notify_ops[ETHTOOL_MSG_KERNEL_MAX + 1] = {
+};
+
+/* default notification handler */
+static void ethnl_default_notify(struct net_device *dev, unsigned int cmd,
+                                const void *data)
+{
+       struct ethnl_reply_data *reply_data;
+       const struct ethnl_request_ops *ops;
+       struct ethnl_req_info *req_info;
+       struct sk_buff *skb;
+       void *reply_payload;
+       int reply_len;
+       int ret;
+
+       if (WARN_ONCE(cmd > ETHTOOL_MSG_KERNEL_MAX ||
+                     !ethnl_default_notify_ops[cmd],
+                     "unexpected notification type %u\n", cmd))
+               return;
+       ops = ethnl_default_notify_ops[cmd];
+       req_info = kzalloc(ops->req_info_size, GFP_KERNEL);
+       if (!req_info)
+               return;
+       reply_data = kmalloc(ops->reply_data_size, GFP_KERNEL);
+       if (!reply_data) {
+               kfree(req_info);
+               return;
+       }
+
+       req_info->dev = dev;
+       req_info->flags |= ETHTOOL_FLAG_COMPACT_BITSETS;
+
+       ethnl_init_reply_data(reply_data, ops, dev);
+       ret = ops->prepare_data(req_info, reply_data, NULL);
+       if (ret < 0)
+               goto err_cleanup;
+       reply_len = ops->reply_size(req_info, reply_data);
+       if (ret < 0)
+               goto err_cleanup;
+       ret = -ENOMEM;
+       skb = genlmsg_new(reply_len, GFP_KERNEL);
+       if (!skb)
+               goto err_cleanup;
+       reply_payload = ethnl_bcastmsg_put(skb, cmd);
+       if (!reply_payload)
+               goto err_skb;
+       ret = ethnl_fill_reply_header(skb, dev, ops->hdr_attr);
+       if (ret < 0)
+               goto err_msg;
+       ret = ops->fill_reply(skb, req_info, reply_data);
+       if (ret < 0)
+               goto err_msg;
+       if (ops->cleanup_data)
+               ops->cleanup_data(reply_data);
+
+       genlmsg_end(skb, reply_payload);
+       kfree(reply_data);
+       kfree(req_info);
+       ethnl_multicast(skb, dev);
+       return;
+
+err_msg:
+       WARN_ONCE(ret == -EMSGSIZE,
+                 "calculated message payload length (%d) not sufficient\n",
+                 reply_len);
+err_skb:
+       nlmsg_free(skb);
+err_cleanup:
+       if (ops->cleanup_data)
+               ops->cleanup_data(reply_data);
+       kfree(reply_data);
+       kfree(req_info);
+       return;
+}
+
 /* notifications */
 
 typedef void (*ethnl_notify_handler_t)(struct net_device *dev, unsigned int cmd,
index bbe5fe60a023b649d096c778b556f80979b67de4..5d56d7779a0608e72a4c83c8a83cf043db76ec52 100644 (file)
@@ -300,7 +300,9 @@ static inline void ethnl_ops_complete(struct net_device *dev)
  * unified infrastructure. When used, a pointer to an instance of this
  * structure is to be added to &ethnl_default_requests array and generic
  * handlers ethnl_default_doit(), ethnl_default_dumpit(),
- * ethnl_default_start() and ethnl_default_done() used in @ethtool_genl_ops.
+ * ethnl_default_start() and ethnl_default_done() used in @ethtool_genl_ops;
+ * ethnl_default_notify() can be used in @ethnl_notify_handlers to send
+ * notifications of the corresponding type.
  */
 struct ethnl_request_ops {
        u8                      request_cmd;