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                nla_total_size(sizeof(u8))  +    /* _RINGS_TCP_DATA_SPLIT */
  58                nla_total_size(sizeof(u32));     /* _RINGS_CQE_SIZE */
  59 }
  60
  61 static int rings_fill_reply(struct sk_buff *skb,
  62                             const struct ethnl_req_info *req_base,
  63                             const struct ethnl_reply_data *reply_base)
  64 {
  65         const struct rings_reply_data *data = RINGS_REPDATA(reply_base);
  66         const struct kernel_ethtool_ringparam *kr = &data->kernel_ringparam;
  67         const struct ethtool_ringparam *ringparam = &data->ringparam;
  68
  69         WARN_ON(kr->tcp_data_split > ETHTOOL_TCP_DATA_SPLIT_ENABLED);
  70
  71         if ((ringparam->rx_max_pending &&
  72              (nla_put_u32(skb, ETHTOOL_A_RINGS_RX_MAX,
  73                           ringparam->rx_max_pending) ||
  74               nla_put_u32(skb, ETHTOOL_A_RINGS_RX,
  75                           ringparam->rx_pending))) ||
  76             (ringparam->rx_mini_max_pending &&
  77              (nla_put_u32(skb, ETHTOOL_A_RINGS_RX_MINI_MAX,
  78                           ringparam->rx_mini_max_pending) ||
  79               nla_put_u32(skb, ETHTOOL_A_RINGS_RX_MINI,
  80                           ringparam->rx_mini_pending))) ||
  81             (ringparam->rx_jumbo_max_pending &&
  82              (nla_put_u32(skb, ETHTOOL_A_RINGS_RX_JUMBO_MAX,
  83                           ringparam->rx_jumbo_max_pending) ||
  84               nla_put_u32(skb, ETHTOOL_A_RINGS_RX_JUMBO,
  85                           ringparam->rx_jumbo_pending))) ||
  86             (ringparam->tx_max_pending &&
  87              (nla_put_u32(skb, ETHTOOL_A_RINGS_TX_MAX,
  88                           ringparam->tx_max_pending) ||
  89               nla_put_u32(skb, ETHTOOL_A_RINGS_TX,
  90                           ringparam->tx_pending)))  ||
  91             (kr->rx_buf_len &&
  92              (nla_put_u32(skb, ETHTOOL_A_RINGS_RX_BUF_LEN, kr->rx_buf_len))) ||
  93             (kr->tcp_data_split &&
  94              (nla_put_u8(skb, ETHTOOL_A_RINGS_TCP_DATA_SPLIT,
  95                          kr->tcp_data_split))) ||
  96             (kr->cqe_size &&
  97              (nla_put_u32(skb, ETHTOOL_A_RINGS_CQE_SIZE, kr->cqe_size))))
  98                 return -EMSGSIZE;
  99
 100         return 0;
 101 }
 102
 103 const struct ethnl_request_ops ethnl_rings_request_ops = {
 104         .request_cmd            = ETHTOOL_MSG_RINGS_GET,
 105         .reply_cmd              = ETHTOOL_MSG_RINGS_GET_REPLY,
 106         .hdr_attr               = ETHTOOL_A_RINGS_HEADER,
 107         .req_info_size          = sizeof(struct rings_req_info),
 108         .reply_data_size        = sizeof(struct rings_reply_data),
 109
 110         .prepare_data           = rings_prepare_data,
 111         .reply_size             = rings_reply_size,
 112         .fill_reply             = rings_fill_reply,
 113 };
 114
 115 /* RINGS_SET */
 116
 117 const struct nla_policy ethnl_rings_set_policy[] = {
 118         [ETHTOOL_A_RINGS_HEADER]                =
 119                 NLA_POLICY_NESTED(ethnl_header_policy),
 120         [ETHTOOL_A_RINGS_RX]                    = { .type = NLA_U32 },
 121         [ETHTOOL_A_RINGS_RX_MINI]               = { .type = NLA_U32 },
 122         [ETHTOOL_A_RINGS_RX_JUMBO]              = { .type = NLA_U32 },
 123         [ETHTOOL_A_RINGS_TX]                    = { .type = NLA_U32 },
 124         [ETHTOOL_A_RINGS_RX_BUF_LEN]            = NLA_POLICY_MIN(NLA_U32, 1),
 125         [ETHTOOL_A_RINGS_CQE_SIZE]              = NLA_POLICY_MIN(NLA_U32, 1),
 126 };
 127
 128 int ethnl_set_rings(struct sk_buff *skb, struct genl_info *info)
 129 {
 130         struct kernel_ethtool_ringparam kernel_ringparam = {};
 131         struct ethtool_ringparam ringparam = {};
 132         struct ethnl_req_info req_info = {};
 133         struct nlattr **tb = info->attrs;
 134         const struct nlattr *err_attr;
 135         const struct ethtool_ops *ops;
 136         struct net_device *dev;
 137         bool mod = false;
 138         int ret;
 139
 140         ret = ethnl_parse_header_dev_get(&req_info,
 141                                          tb[ETHTOOL_A_RINGS_HEADER],
 142                                          genl_info_net(info), info->extack,
 143                                          true);
 144         if (ret < 0)
 145                 return ret;
 146         dev = req_info.dev;
 147         ops = dev->ethtool_ops;
 148         ret = -EOPNOTSUPP;
 149         if (!ops->get_ringparam || !ops->set_ringparam)
 150                 goto out_dev;
 151
 152         rtnl_lock();
 153         ret = ethnl_ops_begin(dev);
 154         if (ret < 0)
 155                 goto out_rtnl;
 156         ops->get_ringparam(dev, &ringparam, &kernel_ringparam, info->extack);
 157
 158         ethnl_update_u32(&ringparam.rx_pending, tb[ETHTOOL_A_RINGS_RX], &mod);
 159         ethnl_update_u32(&ringparam.rx_mini_pending,
 160                          tb[ETHTOOL_A_RINGS_RX_MINI], &mod);
 161         ethnl_update_u32(&ringparam.rx_jumbo_pending,
 162                          tb[ETHTOOL_A_RINGS_RX_JUMBO], &mod);
 163         ethnl_update_u32(&ringparam.tx_pending, tb[ETHTOOL_A_RINGS_TX], &mod);
 164         ethnl_update_u32(&kernel_ringparam.rx_buf_len,
 165                          tb[ETHTOOL_A_RINGS_RX_BUF_LEN], &mod);
 166         ethnl_update_u32(&kernel_ringparam.cqe_size,
 167                          tb[ETHTOOL_A_RINGS_CQE_SIZE], &mod);
 168         ret = 0;
 169         if (!mod)
 170                 goto out_ops;
 171
 172         /* ensure new ring parameters are within limits */
 173         if (ringparam.rx_pending > ringparam.rx_max_pending)
 174                 err_attr = tb[ETHTOOL_A_RINGS_RX];
 175         else if (ringparam.rx_mini_pending > ringparam.rx_mini_max_pending)
 176                 err_attr = tb[ETHTOOL_A_RINGS_RX_MINI];
 177         else if (ringparam.rx_jumbo_pending > ringparam.rx_jumbo_max_pending)
 178                 err_attr = tb[ETHTOOL_A_RINGS_RX_JUMBO];
 179         else if (ringparam.tx_pending > ringparam.tx_max_pending)
 180                 err_attr = tb[ETHTOOL_A_RINGS_TX];
 181         else
 182                 err_attr = NULL;
 183         if (err_attr) {
 184                 ret = -EINVAL;
 185                 NL_SET_ERR_MSG_ATTR(info->extack, err_attr,
 186                                     "requested ring size exceeds maximum");
 187                 goto out_ops;
 188         }
 189
 190         if (kernel_ringparam.rx_buf_len != 0 &&
 191             !(ops->supported_ring_params & ETHTOOL_RING_USE_RX_BUF_LEN)) {
 192                 ret = -EOPNOTSUPP;
 193                 NL_SET_ERR_MSG_ATTR(info->extack,
 194                                     tb[ETHTOOL_A_RINGS_RX_BUF_LEN],
 195                                     "setting rx buf len not supported");
 196                 goto out_ops;
 197         }
 198
 199         if (kernel_ringparam.cqe_size &&
 200             !(ops->supported_ring_params & ETHTOOL_RING_USE_CQE_SIZE)) {
 201                 ret = -EOPNOTSUPP;
 202                 NL_SET_ERR_MSG_ATTR(info->extack,
 203                                     tb[ETHTOOL_A_RINGS_CQE_SIZE],
 204                                     "setting cqe size not supported");
 205                 goto out_ops;
 206         }
 207
 208         ret = dev->ethtool_ops->set_ringparam(dev, &ringparam,
 209                                               &kernel_ringparam, info->extack);
 210         if (ret < 0)
 211                 goto out_ops;
 212         ethtool_notify(dev, ETHTOOL_MSG_RINGS_NTF, NULL);
 213
 214 out_ops:
 215         ethnl_ops_complete(dev);
 216 out_rtnl:
 217         rtnl_unlock();
 218 out_dev:
 219         ethnl_parse_header_dev_put(&req_info);
 220         return ret;
 221 }