LXR linux/net/ethtool/pause.c

   1// SPDX-License-Identifier: GPL-2.0-only
   2
   3#include "netlink.h"
   4#include "common.h"
   5
   6struct pause_req_info {
   7        struct ethnl_req_info           base;
   8};
   9
  10struct pause_reply_data {
  11        struct ethnl_reply_data         base;
  12        struct ethtool_pauseparam       pauseparam;
  13};
  14
  15#define PAUSE_REPDATA(__reply_base) \
  16        container_of(__reply_base, struct pause_reply_data, base)
  17
  18static const struct nla_policy
  19pause_get_policy[ETHTOOL_A_PAUSE_MAX + 1] = {
  20        [ETHTOOL_A_PAUSE_UNSPEC]                = { .type = NLA_REJECT },
  21        [ETHTOOL_A_PAUSE_HEADER]                = { .type = NLA_NESTED },
  22        [ETHTOOL_A_PAUSE_AUTONEG]               = { .type = NLA_REJECT },
  23        [ETHTOOL_A_PAUSE_RX]                    = { .type = NLA_REJECT },
  24        [ETHTOOL_A_PAUSE_TX]                    = { .type = NLA_REJECT },
  25};
  26
  27static int pause_prepare_data(const struct ethnl_req_info *req_base,
  28                              struct ethnl_reply_data *reply_base,
  29                              struct genl_info *info)
  30{
  31        struct pause_reply_data *data = PAUSE_REPDATA(reply_base);
  32        struct net_device *dev = reply_base->dev;
  33        int ret;
  34
  35        if (!dev->ethtool_ops->get_pauseparam)
  36                return -EOPNOTSUPP;
  37        ret = ethnl_ops_begin(dev);
  38        if (ret < 0)
  39                return ret;
  40        dev->ethtool_ops->get_pauseparam(dev, &data->pauseparam);
  41        ethnl_ops_complete(dev);
  42
  43        return 0;
  44}
  45
  46static int pause_reply_size(const struct ethnl_req_info *req_base,
  47                            const struct ethnl_reply_data *reply_base)
  48{
  49        return nla_total_size(sizeof(u8)) +     /* _PAUSE_AUTONEG */
  50                nla_total_size(sizeof(u8)) +    /* _PAUSE_RX */
  51                nla_total_size(sizeof(u8));     /* _PAUSE_TX */
  52}
  53
  54static int pause_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 pause_reply_data *data = PAUSE_REPDATA(reply_base);
  59        const struct ethtool_pauseparam *pauseparam = &data->pauseparam;
  60
  61        if (nla_put_u8(skb, ETHTOOL_A_PAUSE_AUTONEG, !!pauseparam->autoneg) ||
  62            nla_put_u8(skb, ETHTOOL_A_PAUSE_RX, !!pauseparam->rx_pause) ||
  63            nla_put_u8(skb, ETHTOOL_A_PAUSE_TX, !!pauseparam->tx_pause))
  64                return -EMSGSIZE;
  65
  66        return 0;
  67}
  68
  69const struct ethnl_request_ops ethnl_pause_request_ops = {
  70        .request_cmd            = ETHTOOL_MSG_PAUSE_GET,
  71        .reply_cmd              = ETHTOOL_MSG_PAUSE_GET_REPLY,
  72        .hdr_attr               = ETHTOOL_A_PAUSE_HEADER,
  73        .max_attr               = ETHTOOL_A_PAUSE_MAX,
  74        .req_info_size          = sizeof(struct pause_req_info),
  75        .reply_data_size        = sizeof(struct pause_reply_data),
  76        .request_policy         = pause_get_policy,
  77
  78        .prepare_data           = pause_prepare_data,
  79        .reply_size             = pause_reply_size,
  80        .fill_reply             = pause_fill_reply,
  81};
  82
  83/* PAUSE_SET */
  84
  85static const struct nla_policy
  86pause_set_policy[ETHTOOL_A_PAUSE_MAX + 1] = {
  87        [ETHTOOL_A_PAUSE_UNSPEC]                = { .type = NLA_REJECT },
  88        [ETHTOOL_A_PAUSE_HEADER]                = { .type = NLA_NESTED },
  89        [ETHTOOL_A_PAUSE_AUTONEG]               = { .type = NLA_U8 },
  90        [ETHTOOL_A_PAUSE_RX]                    = { .type = NLA_U8 },
  91        [ETHTOOL_A_PAUSE_TX]                    = { .type = NLA_U8 },
  92};
  93
  94int ethnl_set_pause(struct sk_buff *skb, struct genl_info *info)
  95{
  96        struct nlattr *tb[ETHTOOL_A_PAUSE_MAX + 1];
  97        struct ethtool_pauseparam params = {};
  98        struct ethnl_req_info req_info = {};
  99        const struct ethtool_ops *ops;
 100        struct net_device *dev;
 101        bool mod = false;
 102        int ret;
 103
 104        ret = nlmsg_parse(info->nlhdr, GENL_HDRLEN, tb, ETHTOOL_A_PAUSE_MAX,
 105                          pause_set_policy, info->extack);
 106        if (ret < 0)
 107                return ret;
 108        ret = ethnl_parse_header_dev_get(&req_info,
 109                                         tb[ETHTOOL_A_PAUSE_HEADER],
 110                                         genl_info_net(info), info->extack,
 111                                         true);
 112        if (ret < 0)
 113                return ret;
 114        dev = req_info.dev;
 115        ops = dev->ethtool_ops;
 116        ret = -EOPNOTSUPP;
 117        if (!ops->get_pauseparam || !ops->set_pauseparam)
 118                goto out_dev;
 119
 120        rtnl_lock();
 121        ret = ethnl_ops_begin(dev);
 122        if (ret < 0)
 123                goto out_rtnl;
 124        ops->get_pauseparam(dev, &params);
 125
 126        ethnl_update_bool32(&params.autoneg, tb[ETHTOOL_A_PAUSE_AUTONEG], &mod);
 127        ethnl_update_bool32(&params.rx_pause, tb[ETHTOOL_A_PAUSE_RX], &mod);
 128        ethnl_update_bool32(&params.tx_pause, tb[ETHTOOL_A_PAUSE_TX], &mod);
 129        ret = 0;
 130        if (!mod)
 131                goto out_ops;
 132
 133        ret = dev->ethtool_ops->set_pauseparam(dev, &params);
 134        if (ret < 0)
 135                goto out_ops;
 136        ethtool_notify(dev, ETHTOOL_MSG_PAUSE_NTF, NULL);
 137
 138out_ops:
 139        ethnl_ops_complete(dev);
 140out_rtnl:
 141        rtnl_unlock();
 142out_dev:
 143        dev_put(dev);
 144        return ret;
 145}
 146