net/ethtool/debug.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2
   3 #include "netlink.h"
   4 #include "common.h"
   5 #include "bitset.h"
   6
   7 struct debug_req_info {
   8         struct ethnl_req_info           base;
   9 };
  10
  11 struct debug_reply_data {
  12         struct ethnl_reply_data         base;
  13         u32                             msg_mask;
  14 };
  15
  16 #define DEBUG_REPDATA(__reply_base) \
  17         container_of(__reply_base, struct debug_reply_data, base)
  18
  19 const struct nla_policy ethnl_debug_get_policy[] = {
  20         [ETHTOOL_A_DEBUG_HEADER]        =
  21                 NLA_POLICY_NESTED(ethnl_header_policy),
  22 };
  23
  24 static int debug_prepare_data(const struct ethnl_req_info *req_base,
  25                               struct ethnl_reply_data *reply_base,
  26                               struct genl_info *info)
  27 {
  28         struct debug_reply_data *data = DEBUG_REPDATA(reply_base);
  29         struct net_device *dev = reply_base->dev;
  30         int ret;
  31
  32         if (!dev->ethtool_ops->get_msglevel)
  33                 return -EOPNOTSUPP;
  34
  35         ret = ethnl_ops_begin(dev);
  36         if (ret < 0)
  37                 return ret;
  38         data->msg_mask = dev->ethtool_ops->get_msglevel(dev);
  39         ethnl_ops_complete(dev);
  40
  41         return 0;
  42 }
  43
  44 static int debug_reply_size(const struct ethnl_req_info *req_base,
  45                             const struct ethnl_reply_data *reply_base)
  46 {
  47         const struct debug_reply_data *data = DEBUG_REPDATA(reply_base);
  48         bool compact = req_base->flags & ETHTOOL_FLAG_COMPACT_BITSETS;
  49
  50         return ethnl_bitset32_size(&data->msg_mask, NULL, NETIF_MSG_CLASS_COUNT,
  51                                    netif_msg_class_names, compact);
  52 }
  53
  54 static int debug_fill_reply(struct sk_buff *skb,
  55                             const struct ethnl_req_info *req_base,
  56                             const struct ethnl_reply_data *reply_base)
  57 {
  58         const struct debug_reply_data *data = DEBUG_REPDATA(reply_base);
  59         bool compact = req_base->flags & ETHTOOL_FLAG_COMPACT_BITSETS;
  60
  61         return ethnl_put_bitset32(skb, ETHTOOL_A_DEBUG_MSGMASK, &data->msg_mask,
  62                                   NULL, NETIF_MSG_CLASS_COUNT,
  63                                   netif_msg_class_names, compact);
  64 }
  65
  66 const struct ethnl_request_ops ethnl_debug_request_ops = {
  67         .request_cmd            = ETHTOOL_MSG_DEBUG_GET,
  68         .reply_cmd              = ETHTOOL_MSG_DEBUG_GET_REPLY,
  69         .hdr_attr               = ETHTOOL_A_DEBUG_HEADER,
  70         .req_info_size          = sizeof(struct debug_req_info),
  71         .reply_data_size        = sizeof(struct debug_reply_data),
  72
  73         .prepare_data           = debug_prepare_data,
  74         .reply_size             = debug_reply_size,
  75         .fill_reply             = debug_fill_reply,
  76 };
  77
  78 /* DEBUG_SET */
  79
  80 const struct nla_policy ethnl_debug_set_policy[] = {
  81         [ETHTOOL_A_DEBUG_HEADER]        =
  82                 NLA_POLICY_NESTED(ethnl_header_policy),
  83         [ETHTOOL_A_DEBUG_MSGMASK]       = { .type = NLA_NESTED },
  84 };
  85
  86 int ethnl_set_debug(struct sk_buff *skb, struct genl_info *info)
  87 {
  88         struct ethnl_req_info req_info = {};
  89         struct nlattr **tb = info->attrs;
  90         struct net_device *dev;
  91         bool mod = false;
  92         u32 msg_mask;
  93         int ret;
  94
  95         ret = ethnl_parse_header_dev_get(&req_info,
  96                                          tb[ETHTOOL_A_DEBUG_HEADER],
  97                                          genl_info_net(info), info->extack,
  98                                          true);
  99         if (ret < 0)
 100                 return ret;
 101         dev = req_info.dev;
 102         ret = -EOPNOTSUPP;
 103         if (!dev->ethtool_ops->get_msglevel || !dev->ethtool_ops->set_msglevel)
 104                 goto out_dev;
 105
 106         rtnl_lock();
 107         ret = ethnl_ops_begin(dev);
 108         if (ret < 0)
 109                 goto out_rtnl;
 110
 111         msg_mask = dev->ethtool_ops->get_msglevel(dev);
 112         ret = ethnl_update_bitset32(&msg_mask, NETIF_MSG_CLASS_COUNT,
 113                                     tb[ETHTOOL_A_DEBUG_MSGMASK],
 114                                     netif_msg_class_names, info->extack, &mod);
 115         if (ret < 0 || !mod)
 116                 goto out_ops;
 117
 118         dev->ethtool_ops->set_msglevel(dev, msg_mask);
 119         ethtool_notify(dev, ETHTOOL_MSG_DEBUG_NTF, NULL);
 120
 121 out_ops:
 122         ethnl_ops_complete(dev);
 123 out_rtnl:
 124         rtnl_unlock();
 125 out_dev:
 126         dev_put(dev);
 127         return ret;
 128 }