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                               const 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 /* DEBUG_SET */
  67
  68 const struct nla_policy ethnl_debug_set_policy[] = {
  69         [ETHTOOL_A_DEBUG_HEADER]        =
  70                 NLA_POLICY_NESTED(ethnl_header_policy),
  71         [ETHTOOL_A_DEBUG_MSGMASK]       = { .type = NLA_NESTED },
  72 };
  73
  74 static int
  75 ethnl_set_debug_validate(struct ethnl_req_info *req_info,
  76                          struct genl_info *info)
  77 {
  78         const struct ethtool_ops *ops = req_info->dev->ethtool_ops;
  79
  80         return ops->get_msglevel && ops->set_msglevel ? 1 : -EOPNOTSUPP;
  81 }
  82
  83 static int
  84 ethnl_set_debug(struct ethnl_req_info *req_info, struct genl_info *info)
  85 {
  86         struct net_device *dev = req_info->dev;
  87         struct nlattr **tb = info->attrs;
  88         bool mod = false;
  89         u32 msg_mask;
  90         int ret;
  91
  92         msg_mask = dev->ethtool_ops->get_msglevel(dev);
  93         ret = ethnl_update_bitset32(&msg_mask, NETIF_MSG_CLASS_COUNT,
  94                                     tb[ETHTOOL_A_DEBUG_MSGMASK],
  95                                     netif_msg_class_names, info->extack, &mod);
  96         if (ret < 0 || !mod)
  97                 return ret;
  98
  99         dev->ethtool_ops->set_msglevel(dev, msg_mask);
 100         return 1;
 101 }
 102
 103 const struct ethnl_request_ops ethnl_debug_request_ops = {
 104         .request_cmd            = ETHTOOL_MSG_DEBUG_GET,
 105         .reply_cmd              = ETHTOOL_MSG_DEBUG_GET_REPLY,
 106         .hdr_attr               = ETHTOOL_A_DEBUG_HEADER,
 107         .req_info_size          = sizeof(struct debug_req_info),
 108         .reply_data_size        = sizeof(struct debug_reply_data),
 109
 110         .prepare_data           = debug_prepare_data,
 111         .reply_size             = debug_reply_size,
 112         .fill_reply             = debug_fill_reply,
 113
 114         .set_validate           = ethnl_set_debug_validate,
 115         .set                    = ethnl_set_debug,
 116         .set_ntf_cmd            = ETHTOOL_MSG_DEBUG_NTF,
 117 };