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- // SPDX-License-Identifier: GPL-2.0-only
- #include "netlink.h"
- #include "common.h"
- struct rings_req_info {
- struct ethnl_req_info base;
- };
- struct rings_reply_data {
- struct ethnl_reply_data base;
- struct ethtool_ringparam ringparam;
- struct kernel_ethtool_ringparam kernel_ringparam;
- };
- #define RINGS_REPDATA(__reply_base) \
- container_of(__reply_base, struct rings_reply_data, base)
- const struct nla_policy ethnl_rings_get_policy[] = {
- [ETHTOOL_A_RINGS_HEADER] =
- NLA_POLICY_NESTED(ethnl_header_policy),
- };
- static int rings_prepare_data(const struct ethnl_req_info *req_base,
- struct ethnl_reply_data *reply_base,
- struct genl_info *info)
- {
- struct rings_reply_data *data = RINGS_REPDATA(reply_base);
- struct netlink_ext_ack *extack = info ? info->extack : NULL;
- struct net_device *dev = reply_base->dev;
- int ret;
- if (!dev->ethtool_ops->get_ringparam)
- return -EOPNOTSUPP;
- ret = ethnl_ops_begin(dev);
- if (ret < 0)
- return ret;
- dev->ethtool_ops->get_ringparam(dev, &data->ringparam,
- &data->kernel_ringparam, extack);
- ethnl_ops_complete(dev);
- return 0;
- }
- static int rings_reply_size(const struct ethnl_req_info *req_base,
- const struct ethnl_reply_data *reply_base)
- {
- return nla_total_size(sizeof(u32)) + /* _RINGS_RX_MAX */
- nla_total_size(sizeof(u32)) + /* _RINGS_RX_MINI_MAX */
- nla_total_size(sizeof(u32)) + /* _RINGS_RX_JUMBO_MAX */
- nla_total_size(sizeof(u32)) + /* _RINGS_TX_MAX */
- nla_total_size(sizeof(u32)) + /* _RINGS_RX */
- nla_total_size(sizeof(u32)) + /* _RINGS_RX_MINI */
- nla_total_size(sizeof(u32)) + /* _RINGS_RX_JUMBO */
- nla_total_size(sizeof(u32)) + /* _RINGS_TX */
- nla_total_size(sizeof(u32)) + /* _RINGS_RX_BUF_LEN */
- nla_total_size(sizeof(u8)) + /* _RINGS_TCP_DATA_SPLIT */
- nla_total_size(sizeof(u32) + /* _RINGS_CQE_SIZE */
- nla_total_size(sizeof(u8))); /* _RINGS_TX_PUSH */
- }
- static int rings_fill_reply(struct sk_buff *skb,
- const struct ethnl_req_info *req_base,
- const struct ethnl_reply_data *reply_base)
- {
- const struct rings_reply_data *data = RINGS_REPDATA(reply_base);
- const struct kernel_ethtool_ringparam *kr = &data->kernel_ringparam;
- const struct ethtool_ringparam *ringparam = &data->ringparam;
- WARN_ON(kr->tcp_data_split > ETHTOOL_TCP_DATA_SPLIT_ENABLED);
- if ((ringparam->rx_max_pending &&
- (nla_put_u32(skb, ETHTOOL_A_RINGS_RX_MAX,
- ringparam->rx_max_pending) ||
- nla_put_u32(skb, ETHTOOL_A_RINGS_RX,
- ringparam->rx_pending))) ||
- (ringparam->rx_mini_max_pending &&
- (nla_put_u32(skb, ETHTOOL_A_RINGS_RX_MINI_MAX,
- ringparam->rx_mini_max_pending) ||
- nla_put_u32(skb, ETHTOOL_A_RINGS_RX_MINI,
- ringparam->rx_mini_pending))) ||
- (ringparam->rx_jumbo_max_pending &&
- (nla_put_u32(skb, ETHTOOL_A_RINGS_RX_JUMBO_MAX,
- ringparam->rx_jumbo_max_pending) ||
- nla_put_u32(skb, ETHTOOL_A_RINGS_RX_JUMBO,
- ringparam->rx_jumbo_pending))) ||
- (ringparam->tx_max_pending &&
- (nla_put_u32(skb, ETHTOOL_A_RINGS_TX_MAX,
- ringparam->tx_max_pending) ||
- nla_put_u32(skb, ETHTOOL_A_RINGS_TX,
- ringparam->tx_pending))) ||
- (kr->rx_buf_len &&
- (nla_put_u32(skb, ETHTOOL_A_RINGS_RX_BUF_LEN, kr->rx_buf_len))) ||
- (kr->tcp_data_split &&
- (nla_put_u8(skb, ETHTOOL_A_RINGS_TCP_DATA_SPLIT,
- kr->tcp_data_split))) ||
- (kr->cqe_size &&
- (nla_put_u32(skb, ETHTOOL_A_RINGS_CQE_SIZE, kr->cqe_size))) ||
- nla_put_u8(skb, ETHTOOL_A_RINGS_TX_PUSH, !!kr->tx_push))
- return -EMSGSIZE;
- return 0;
- }
- const struct ethnl_request_ops ethnl_rings_request_ops = {
- .request_cmd = ETHTOOL_MSG_RINGS_GET,
- .reply_cmd = ETHTOOL_MSG_RINGS_GET_REPLY,
- .hdr_attr = ETHTOOL_A_RINGS_HEADER,
- .req_info_size = sizeof(struct rings_req_info),
- .reply_data_size = sizeof(struct rings_reply_data),
- .prepare_data = rings_prepare_data,
- .reply_size = rings_reply_size,
- .fill_reply = rings_fill_reply,
- };
- /* RINGS_SET */
- const struct nla_policy ethnl_rings_set_policy[] = {
- [ETHTOOL_A_RINGS_HEADER] =
- NLA_POLICY_NESTED(ethnl_header_policy),
- [ETHTOOL_A_RINGS_RX] = { .type = NLA_U32 },
- [ETHTOOL_A_RINGS_RX_MINI] = { .type = NLA_U32 },
- [ETHTOOL_A_RINGS_RX_JUMBO] = { .type = NLA_U32 },
- [ETHTOOL_A_RINGS_TX] = { .type = NLA_U32 },
- [ETHTOOL_A_RINGS_RX_BUF_LEN] = NLA_POLICY_MIN(NLA_U32, 1),
- [ETHTOOL_A_RINGS_CQE_SIZE] = NLA_POLICY_MIN(NLA_U32, 1),
- [ETHTOOL_A_RINGS_TX_PUSH] = NLA_POLICY_MAX(NLA_U8, 1),
- };
- int ethnl_set_rings(struct sk_buff *skb, struct genl_info *info)
- {
- struct kernel_ethtool_ringparam kernel_ringparam = {};
- struct ethtool_ringparam ringparam = {};
- struct ethnl_req_info req_info = {};
- struct nlattr **tb = info->attrs;
- const struct nlattr *err_attr;
- const struct ethtool_ops *ops;
- struct net_device *dev;
- bool mod = false;
- int ret;
- ret = ethnl_parse_header_dev_get(&req_info,
- tb[ETHTOOL_A_RINGS_HEADER],
- genl_info_net(info), info->extack,
- true);
- if (ret < 0)
- return ret;
- dev = req_info.dev;
- ops = dev->ethtool_ops;
- ret = -EOPNOTSUPP;
- if (!ops->get_ringparam || !ops->set_ringparam)
- goto out_dev;
- if (tb[ETHTOOL_A_RINGS_RX_BUF_LEN] &&
- !(ops->supported_ring_params & ETHTOOL_RING_USE_RX_BUF_LEN)) {
- ret = -EOPNOTSUPP;
- NL_SET_ERR_MSG_ATTR(info->extack,
- tb[ETHTOOL_A_RINGS_RX_BUF_LEN],
- "setting rx buf len not supported");
- goto out_dev;
- }
- if (tb[ETHTOOL_A_RINGS_CQE_SIZE] &&
- !(ops->supported_ring_params & ETHTOOL_RING_USE_CQE_SIZE)) {
- ret = -EOPNOTSUPP;
- NL_SET_ERR_MSG_ATTR(info->extack,
- tb[ETHTOOL_A_RINGS_CQE_SIZE],
- "setting cqe size not supported");
- goto out_dev;
- }
- if (tb[ETHTOOL_A_RINGS_TX_PUSH] &&
- !(ops->supported_ring_params & ETHTOOL_RING_USE_TX_PUSH)) {
- ret = -EOPNOTSUPP;
- NL_SET_ERR_MSG_ATTR(info->extack,
- tb[ETHTOOL_A_RINGS_TX_PUSH],
- "setting tx push not supported");
- goto out_dev;
- }
- rtnl_lock();
- ret = ethnl_ops_begin(dev);
- if (ret < 0)
- goto out_rtnl;
- ops->get_ringparam(dev, &ringparam, &kernel_ringparam, info->extack);
- ethnl_update_u32(&ringparam.rx_pending, tb[ETHTOOL_A_RINGS_RX], &mod);
- ethnl_update_u32(&ringparam.rx_mini_pending,
- tb[ETHTOOL_A_RINGS_RX_MINI], &mod);
- ethnl_update_u32(&ringparam.rx_jumbo_pending,
- tb[ETHTOOL_A_RINGS_RX_JUMBO], &mod);
- ethnl_update_u32(&ringparam.tx_pending, tb[ETHTOOL_A_RINGS_TX], &mod);
- ethnl_update_u32(&kernel_ringparam.rx_buf_len,
- tb[ETHTOOL_A_RINGS_RX_BUF_LEN], &mod);
- ethnl_update_u32(&kernel_ringparam.cqe_size,
- tb[ETHTOOL_A_RINGS_CQE_SIZE], &mod);
- ethnl_update_u8(&kernel_ringparam.tx_push,
- tb[ETHTOOL_A_RINGS_TX_PUSH], &mod);
- ret = 0;
- if (!mod)
- goto out_ops;
- /* ensure new ring parameters are within limits */
- if (ringparam.rx_pending > ringparam.rx_max_pending)
- err_attr = tb[ETHTOOL_A_RINGS_RX];
- else if (ringparam.rx_mini_pending > ringparam.rx_mini_max_pending)
- err_attr = tb[ETHTOOL_A_RINGS_RX_MINI];
- else if (ringparam.rx_jumbo_pending > ringparam.rx_jumbo_max_pending)
- err_attr = tb[ETHTOOL_A_RINGS_RX_JUMBO];
- else if (ringparam.tx_pending > ringparam.tx_max_pending)
- err_attr = tb[ETHTOOL_A_RINGS_TX];
- else
- err_attr = NULL;
- if (err_attr) {
- ret = -EINVAL;
- NL_SET_ERR_MSG_ATTR(info->extack, err_attr,
- "requested ring size exceeds maximum");
- goto out_ops;
- }
- ret = dev->ethtool_ops->set_ringparam(dev, &ringparam,
- &kernel_ringparam, info->extack);
- if (ret < 0)
- goto out_ops;
- ethtool_notify(dev, ETHTOOL_MSG_RINGS_NTF, NULL);
- out_ops:
- ethnl_ops_complete(dev);
- out_rtnl:
- rtnl_unlock();
- out_dev:
- ethnl_parse_header_dev_put(&req_info);
- return ret;
- }
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