net/ethtool/rings.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2
   3 #include "netlink.h"
   4 #include "common.h"
   5
   6 struct rings_req_info {
   7         struct ethnl_req_info           base;
   8 };
   9
  10 struct rings_reply_data {
  11         struct ethnl_reply_data         base;
  12         struct ethtool_ringparam        ringparam;
  13         struct kernel_ethtool_ringparam kernel_ringparam;
  14 };
  15
  16 #define RINGS_REPDATA(__reply_base) \
  17         container_of(__reply_base, struct rings_reply_data, base)
  18
  19 const struct nla_policy ethnl_rings_get_policy[] = {
  20         [ETHTOOL_A_RINGS_HEADER]                =
  21                 NLA_POLICY_NESTED(ethnl_header_policy),
  22 };
  23
  24 static int rings_prepare_data(const struct ethnl_req_info *req_base,
  25                               struct ethnl_reply_data *reply_base,
  26                               struct genl_info *info)
  27 {
  28         struct rings_reply_data *data = RINGS_REPDATA(reply_base);
  29         struct netlink_ext_ack *extack = info ? info->extack : NULL;
  30         struct net_device *dev = reply_base->dev;
  31         int ret;
  32
  33         if (!dev->ethtool_ops->get_ringparam)
  34                 return -EOPNOTSUPP;
  35         ret = ethnl_ops_begin(dev);
  36         if (ret < 0)
  37                 return ret;
  38         dev->ethtool_ops->get_ringparam(dev, &data->ringparam,
  39                                         &data->kernel_ringparam, extack);
  40         ethnl_ops_complete(dev);
  41
  42         return 0;
  43 }
  44
  45 static int rings_reply_size(const struct ethnl_req_info *req_base,
  46                             const struct ethnl_reply_data *reply_base)
  47 {
  48         return nla_total_size(sizeof(u32)) +    /* _RINGS_RX_MAX */
  49                nla_total_size(sizeof(u32)) +    /* _RINGS_RX_MINI_MAX */
  50                nla_total_size(sizeof(u32)) +    /* _RINGS_RX_JUMBO_MAX */
  51                nla_total_size(sizeof(u32)) +    /* _RINGS_TX_MAX */
  52                nla_total_size(sizeof(u32)) +    /* _RINGS_RX */
  53                nla_total_size(sizeof(u32)) +    /* _RINGS_RX_MINI */
  54                nla_total_size(sizeof(u32)) +    /* _RINGS_RX_JUMBO */
  55                nla_total_size(sizeof(u32)) +    /* _RINGS_TX */
  56                nla_total_size(sizeof(u32));     /* _RINGS_RX_BUF_LEN */
  57 }
  58
  59 static int rings_fill_reply(struct sk_buff *skb,
  60                             const struct ethnl_req_info *req_base,
  61                             const struct ethnl_reply_data *reply_base)
  62 {
  63         const struct rings_reply_data *data = RINGS_REPDATA(reply_base);
  64         const struct kernel_ethtool_ringparam *kernel_ringparam = &data->kernel_ringparam;
  65         const struct ethtool_ringparam *ringparam = &data->ringparam;
  66
  67         if ((ringparam->rx_max_pending &&
  68              (nla_put_u32(skb, ETHTOOL_A_RINGS_RX_MAX,
  69                           ringparam->rx_max_pending) ||
  70               nla_put_u32(skb, ETHTOOL_A_RINGS_RX,
  71                           ringparam->rx_pending))) ||
  72             (ringparam->rx_mini_max_pending &&
  73              (nla_put_u32(skb, ETHTOOL_A_RINGS_RX_MINI_MAX,
  74                           ringparam->rx_mini_max_pending) ||
  75               nla_put_u32(skb, ETHTOOL_A_RINGS_RX_MINI,
  76                           ringparam->rx_mini_pending))) ||
  77             (ringparam->rx_jumbo_max_pending &&
  78              (nla_put_u32(skb, ETHTOOL_A_RINGS_RX_JUMBO_MAX,
  79                           ringparam->rx_jumbo_max_pending) ||
  80               nla_put_u32(skb, ETHTOOL_A_RINGS_RX_JUMBO,
  81                           ringparam->rx_jumbo_pending))) ||
  82             (ringparam->tx_max_pending &&
  83              (nla_put_u32(skb, ETHTOOL_A_RINGS_TX_MAX,
  84                           ringparam->tx_max_pending) ||
  85               nla_put_u32(skb, ETHTOOL_A_RINGS_TX,
  86                           ringparam->tx_pending)))  ||
  87             (kernel_ringparam->rx_buf_len &&
  88              (nla_put_u32(skb, ETHTOOL_A_RINGS_RX_BUF_LEN,
  89                           kernel_ringparam->rx_buf_len))))
  90                 return -EMSGSIZE;
  91
  92         return 0;
  93 }
  94
  95 const struct ethnl_request_ops ethnl_rings_request_ops = {
  96         .request_cmd            = ETHTOOL_MSG_RINGS_GET,
  97         .reply_cmd              = ETHTOOL_MSG_RINGS_GET_REPLY,
  98         .hdr_attr               = ETHTOOL_A_RINGS_HEADER,
  99         .req_info_size          = sizeof(struct rings_req_info),
 100         .reply_data_size        = sizeof(struct rings_reply_data),
 101
 102         .prepare_data           = rings_prepare_data,
 103         .reply_size             = rings_reply_size,
 104         .fill_reply             = rings_fill_reply,
 105 };
 106
 107 /* RINGS_SET */
 108
 109 const struct nla_policy ethnl_rings_set_policy[] = {
 110         [ETHTOOL_A_RINGS_HEADER]                =
 111                 NLA_POLICY_NESTED(ethnl_header_policy),
 112         [ETHTOOL_A_RINGS_RX]                    = { .type = NLA_U32 },
 113         [ETHTOOL_A_RINGS_RX_MINI]               = { .type = NLA_U32 },
 114         [ETHTOOL_A_RINGS_RX_JUMBO]              = { .type = NLA_U32 },
 115         [ETHTOOL_A_RINGS_TX]                    = { .type = NLA_U32 },
 116         [ETHTOOL_A_RINGS_RX_BUF_LEN]            = NLA_POLICY_MIN(NLA_U32, 1),
 117 };
 118
 119 int ethnl_set_rings(struct sk_buff *skb, struct genl_info *info)
 120 {
 121         struct kernel_ethtool_ringparam kernel_ringparam = {};
 122         struct ethtool_ringparam ringparam = {};
 123         struct ethnl_req_info req_info = {};
 124         struct nlattr **tb = info->attrs;
 125         const struct nlattr *err_attr;
 126         const struct ethtool_ops *ops;
 127         struct net_device *dev;
 128         bool mod = false;
 129         int ret;
 130
 131         ret = ethnl_parse_header_dev_get(&req_info,
 132                                          tb[ETHTOOL_A_RINGS_HEADER],
 133                                          genl_info_net(info), info->extack,
 134                                          true);
 135         if (ret < 0)
 136                 return ret;
 137         dev = req_info.dev;
 138         ops = dev->ethtool_ops;
 139         ret = -EOPNOTSUPP;
 140         if (!ops->get_ringparam || !ops->set_ringparam)
 141                 goto out_dev;
 142
 143         rtnl_lock();
 144         ret = ethnl_ops_begin(dev);
 145         if (ret < 0)
 146                 goto out_rtnl;
 147         ops->get_ringparam(dev, &ringparam, &kernel_ringparam, info->extack);
 148
 149         ethnl_update_u32(&ringparam.rx_pending, tb[ETHTOOL_A_RINGS_RX], &mod);
 150         ethnl_update_u32(&ringparam.rx_mini_pending,
 151                          tb[ETHTOOL_A_RINGS_RX_MINI], &mod);
 152         ethnl_update_u32(&ringparam.rx_jumbo_pending,
 153                          tb[ETHTOOL_A_RINGS_RX_JUMBO], &mod);
 154         ethnl_update_u32(&ringparam.tx_pending, tb[ETHTOOL_A_RINGS_TX], &mod);
 155         ethnl_update_u32(&kernel_ringparam.rx_buf_len,
 156                          tb[ETHTOOL_A_RINGS_RX_BUF_LEN], &mod);
 157         ret = 0;
 158         if (!mod)
 159                 goto out_ops;
 160
 161         /* ensure new ring parameters are within limits */
 162         if (ringparam.rx_pending > ringparam.rx_max_pending)
 163                 err_attr = tb[ETHTOOL_A_RINGS_RX];
 164         else if (ringparam.rx_mini_pending > ringparam.rx_mini_max_pending)
 165                 err_attr = tb[ETHTOOL_A_RINGS_RX_MINI];
 166         else if (ringparam.rx_jumbo_pending > ringparam.rx_jumbo_max_pending)
 167                 err_attr = tb[ETHTOOL_A_RINGS_RX_JUMBO];
 168         else if (ringparam.tx_pending > ringparam.tx_max_pending)
 169                 err_attr = tb[ETHTOOL_A_RINGS_TX];
 170         else
 171                 err_attr = NULL;
 172         if (err_attr) {
 173                 ret = -EINVAL;
 174                 NL_SET_ERR_MSG_ATTR(info->extack, err_attr,
 175                                     "requested ring size exceeds maximum");
 176                 goto out_ops;
 177         }
 178
 179         if (kernel_ringparam.rx_buf_len != 0 &&
 180             !(ops->supported_ring_params & ETHTOOL_RING_USE_RX_BUF_LEN)) {
 181                 ret = -EOPNOTSUPP;
 182                 NL_SET_ERR_MSG_ATTR(info->extack,
 183                                     tb[ETHTOOL_A_RINGS_RX_BUF_LEN],
 184                                     "setting rx buf len not supported");
 185                 goto out_ops;
 186         }
 187
 188         ret = dev->ethtool_ops->set_ringparam(dev, &ringparam,
 189                                               &kernel_ringparam, info->extack);
 190         if (ret < 0)
 191                 goto out_ops;
 192         ethtool_notify(dev, ETHTOOL_MSG_RINGS_NTF, NULL);
 193
 194 out_ops:
 195         ethnl_ops_complete(dev);
 196 out_rtnl:
 197         rtnl_unlock();
 198 out_dev:
 199         ethnl_parse_header_dev_put(&req_info);
 200         return ret;
 201 }