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50d7371071
Follow up commit 9690ae6042 ("ethtool: add header/data split
indication") and add the set part of Ethtool's header split, i.e.
ability to enable/disable header split via the Ethtool Netlink
interface. This might be helpful to optimize the setup for particular
workloads, for example, to avoid XDP frags, and so on.
A driver should advertise ``ETHTOOL_RING_USE_TCP_DATA_SPLIT`` in its
ops->supported_ring_params to allow doing that. "Unknown" passed from
the userspace when the header split is supported means the driver is
free to choose the preferred state.
Reviewed-by: Przemek Kitszel <przemyslaw.kitszel@intel.com>
Signed-off-by: Alexander Lobakin <aleksander.lobakin@intel.com>
Link: https://lore.kernel.org/r/20231212142752.935000-2-aleksander.lobakin@intel.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
273 lines
9.4 KiB
C
273 lines
9.4 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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#include "netlink.h"
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#include "common.h"
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struct rings_req_info {
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struct ethnl_req_info base;
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};
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struct rings_reply_data {
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struct ethnl_reply_data base;
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struct ethtool_ringparam ringparam;
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struct kernel_ethtool_ringparam kernel_ringparam;
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u32 supported_ring_params;
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};
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#define RINGS_REPDATA(__reply_base) \
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container_of(__reply_base, struct rings_reply_data, base)
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const struct nla_policy ethnl_rings_get_policy[] = {
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[ETHTOOL_A_RINGS_HEADER] =
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NLA_POLICY_NESTED(ethnl_header_policy),
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};
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static int rings_prepare_data(const struct ethnl_req_info *req_base,
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struct ethnl_reply_data *reply_base,
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const struct genl_info *info)
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{
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struct rings_reply_data *data = RINGS_REPDATA(reply_base);
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struct net_device *dev = reply_base->dev;
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int ret;
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if (!dev->ethtool_ops->get_ringparam)
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return -EOPNOTSUPP;
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data->supported_ring_params = dev->ethtool_ops->supported_ring_params;
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ret = ethnl_ops_begin(dev);
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if (ret < 0)
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return ret;
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dev->ethtool_ops->get_ringparam(dev, &data->ringparam,
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&data->kernel_ringparam, info->extack);
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ethnl_ops_complete(dev);
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return 0;
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}
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static int rings_reply_size(const struct ethnl_req_info *req_base,
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const struct ethnl_reply_data *reply_base)
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{
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return nla_total_size(sizeof(u32)) + /* _RINGS_RX_MAX */
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nla_total_size(sizeof(u32)) + /* _RINGS_RX_MINI_MAX */
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nla_total_size(sizeof(u32)) + /* _RINGS_RX_JUMBO_MAX */
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nla_total_size(sizeof(u32)) + /* _RINGS_TX_MAX */
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nla_total_size(sizeof(u32)) + /* _RINGS_RX */
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nla_total_size(sizeof(u32)) + /* _RINGS_RX_MINI */
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nla_total_size(sizeof(u32)) + /* _RINGS_RX_JUMBO */
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nla_total_size(sizeof(u32)) + /* _RINGS_TX */
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nla_total_size(sizeof(u32)) + /* _RINGS_RX_BUF_LEN */
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nla_total_size(sizeof(u8)) + /* _RINGS_TCP_DATA_SPLIT */
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nla_total_size(sizeof(u32) + /* _RINGS_CQE_SIZE */
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nla_total_size(sizeof(u8)) + /* _RINGS_TX_PUSH */
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nla_total_size(sizeof(u8))) + /* _RINGS_RX_PUSH */
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nla_total_size(sizeof(u32)) + /* _RINGS_TX_PUSH_BUF_LEN */
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nla_total_size(sizeof(u32)); /* _RINGS_TX_PUSH_BUF_LEN_MAX */
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}
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static int rings_fill_reply(struct sk_buff *skb,
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const struct ethnl_req_info *req_base,
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const struct ethnl_reply_data *reply_base)
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{
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const struct rings_reply_data *data = RINGS_REPDATA(reply_base);
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const struct kernel_ethtool_ringparam *kr = &data->kernel_ringparam;
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const struct ethtool_ringparam *ringparam = &data->ringparam;
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u32 supported_ring_params = data->supported_ring_params;
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WARN_ON(kr->tcp_data_split > ETHTOOL_TCP_DATA_SPLIT_ENABLED);
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if ((ringparam->rx_max_pending &&
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(nla_put_u32(skb, ETHTOOL_A_RINGS_RX_MAX,
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ringparam->rx_max_pending) ||
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nla_put_u32(skb, ETHTOOL_A_RINGS_RX,
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ringparam->rx_pending))) ||
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(ringparam->rx_mini_max_pending &&
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(nla_put_u32(skb, ETHTOOL_A_RINGS_RX_MINI_MAX,
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ringparam->rx_mini_max_pending) ||
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nla_put_u32(skb, ETHTOOL_A_RINGS_RX_MINI,
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ringparam->rx_mini_pending))) ||
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(ringparam->rx_jumbo_max_pending &&
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(nla_put_u32(skb, ETHTOOL_A_RINGS_RX_JUMBO_MAX,
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ringparam->rx_jumbo_max_pending) ||
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nla_put_u32(skb, ETHTOOL_A_RINGS_RX_JUMBO,
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ringparam->rx_jumbo_pending))) ||
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(ringparam->tx_max_pending &&
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(nla_put_u32(skb, ETHTOOL_A_RINGS_TX_MAX,
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ringparam->tx_max_pending) ||
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nla_put_u32(skb, ETHTOOL_A_RINGS_TX,
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ringparam->tx_pending))) ||
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(kr->rx_buf_len &&
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(nla_put_u32(skb, ETHTOOL_A_RINGS_RX_BUF_LEN, kr->rx_buf_len))) ||
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(kr->tcp_data_split &&
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(nla_put_u8(skb, ETHTOOL_A_RINGS_TCP_DATA_SPLIT,
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kr->tcp_data_split))) ||
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(kr->cqe_size &&
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(nla_put_u32(skb, ETHTOOL_A_RINGS_CQE_SIZE, kr->cqe_size))) ||
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nla_put_u8(skb, ETHTOOL_A_RINGS_TX_PUSH, !!kr->tx_push) ||
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nla_put_u8(skb, ETHTOOL_A_RINGS_RX_PUSH, !!kr->rx_push) ||
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((supported_ring_params & ETHTOOL_RING_USE_TX_PUSH_BUF_LEN) &&
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(nla_put_u32(skb, ETHTOOL_A_RINGS_TX_PUSH_BUF_LEN_MAX,
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kr->tx_push_buf_max_len) ||
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nla_put_u32(skb, ETHTOOL_A_RINGS_TX_PUSH_BUF_LEN,
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kr->tx_push_buf_len))))
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return -EMSGSIZE;
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return 0;
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}
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/* RINGS_SET */
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const struct nla_policy ethnl_rings_set_policy[] = {
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[ETHTOOL_A_RINGS_HEADER] =
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NLA_POLICY_NESTED(ethnl_header_policy),
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[ETHTOOL_A_RINGS_RX] = { .type = NLA_U32 },
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[ETHTOOL_A_RINGS_RX_MINI] = { .type = NLA_U32 },
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[ETHTOOL_A_RINGS_RX_JUMBO] = { .type = NLA_U32 },
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[ETHTOOL_A_RINGS_TX] = { .type = NLA_U32 },
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[ETHTOOL_A_RINGS_RX_BUF_LEN] = NLA_POLICY_MIN(NLA_U32, 1),
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[ETHTOOL_A_RINGS_TCP_DATA_SPLIT] =
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NLA_POLICY_MAX(NLA_U8, ETHTOOL_TCP_DATA_SPLIT_ENABLED),
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[ETHTOOL_A_RINGS_CQE_SIZE] = NLA_POLICY_MIN(NLA_U32, 1),
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[ETHTOOL_A_RINGS_TX_PUSH] = NLA_POLICY_MAX(NLA_U8, 1),
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[ETHTOOL_A_RINGS_RX_PUSH] = NLA_POLICY_MAX(NLA_U8, 1),
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[ETHTOOL_A_RINGS_TX_PUSH_BUF_LEN] = { .type = NLA_U32 },
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};
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static int
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ethnl_set_rings_validate(struct ethnl_req_info *req_info,
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struct genl_info *info)
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{
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const struct ethtool_ops *ops = req_info->dev->ethtool_ops;
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struct nlattr **tb = info->attrs;
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if (tb[ETHTOOL_A_RINGS_RX_BUF_LEN] &&
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!(ops->supported_ring_params & ETHTOOL_RING_USE_RX_BUF_LEN)) {
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NL_SET_ERR_MSG_ATTR(info->extack,
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tb[ETHTOOL_A_RINGS_RX_BUF_LEN],
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"setting rx buf len not supported");
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return -EOPNOTSUPP;
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}
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if (tb[ETHTOOL_A_RINGS_TCP_DATA_SPLIT] &&
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!(ops->supported_ring_params & ETHTOOL_RING_USE_TCP_DATA_SPLIT)) {
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NL_SET_ERR_MSG_ATTR(info->extack,
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tb[ETHTOOL_A_RINGS_TCP_DATA_SPLIT],
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"setting TCP data split is not supported");
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return -EOPNOTSUPP;
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}
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if (tb[ETHTOOL_A_RINGS_CQE_SIZE] &&
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!(ops->supported_ring_params & ETHTOOL_RING_USE_CQE_SIZE)) {
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NL_SET_ERR_MSG_ATTR(info->extack,
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tb[ETHTOOL_A_RINGS_CQE_SIZE],
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"setting cqe size not supported");
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return -EOPNOTSUPP;
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}
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if (tb[ETHTOOL_A_RINGS_TX_PUSH] &&
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!(ops->supported_ring_params & ETHTOOL_RING_USE_TX_PUSH)) {
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NL_SET_ERR_MSG_ATTR(info->extack,
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tb[ETHTOOL_A_RINGS_TX_PUSH],
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"setting tx push not supported");
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return -EOPNOTSUPP;
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}
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if (tb[ETHTOOL_A_RINGS_RX_PUSH] &&
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!(ops->supported_ring_params & ETHTOOL_RING_USE_RX_PUSH)) {
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NL_SET_ERR_MSG_ATTR(info->extack,
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tb[ETHTOOL_A_RINGS_RX_PUSH],
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"setting rx push not supported");
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return -EOPNOTSUPP;
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}
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if (tb[ETHTOOL_A_RINGS_TX_PUSH_BUF_LEN] &&
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!(ops->supported_ring_params & ETHTOOL_RING_USE_TX_PUSH_BUF_LEN)) {
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NL_SET_ERR_MSG_ATTR(info->extack,
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tb[ETHTOOL_A_RINGS_TX_PUSH_BUF_LEN],
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"setting tx push buf len is not supported");
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return -EOPNOTSUPP;
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}
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return ops->get_ringparam && ops->set_ringparam ? 1 : -EOPNOTSUPP;
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}
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static int
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ethnl_set_rings(struct ethnl_req_info *req_info, struct genl_info *info)
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{
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struct kernel_ethtool_ringparam kernel_ringparam = {};
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struct ethtool_ringparam ringparam = {};
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struct net_device *dev = req_info->dev;
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struct nlattr **tb = info->attrs;
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const struct nlattr *err_attr;
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bool mod = false;
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int ret;
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dev->ethtool_ops->get_ringparam(dev, &ringparam,
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&kernel_ringparam, info->extack);
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ethnl_update_u32(&ringparam.rx_pending, tb[ETHTOOL_A_RINGS_RX], &mod);
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ethnl_update_u32(&ringparam.rx_mini_pending,
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tb[ETHTOOL_A_RINGS_RX_MINI], &mod);
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ethnl_update_u32(&ringparam.rx_jumbo_pending,
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tb[ETHTOOL_A_RINGS_RX_JUMBO], &mod);
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ethnl_update_u32(&ringparam.tx_pending, tb[ETHTOOL_A_RINGS_TX], &mod);
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ethnl_update_u32(&kernel_ringparam.rx_buf_len,
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tb[ETHTOOL_A_RINGS_RX_BUF_LEN], &mod);
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ethnl_update_u8(&kernel_ringparam.tcp_data_split,
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tb[ETHTOOL_A_RINGS_TCP_DATA_SPLIT], &mod);
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ethnl_update_u32(&kernel_ringparam.cqe_size,
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tb[ETHTOOL_A_RINGS_CQE_SIZE], &mod);
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ethnl_update_u8(&kernel_ringparam.tx_push,
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tb[ETHTOOL_A_RINGS_TX_PUSH], &mod);
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ethnl_update_u8(&kernel_ringparam.rx_push,
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tb[ETHTOOL_A_RINGS_RX_PUSH], &mod);
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ethnl_update_u32(&kernel_ringparam.tx_push_buf_len,
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tb[ETHTOOL_A_RINGS_TX_PUSH_BUF_LEN], &mod);
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if (!mod)
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return 0;
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/* ensure new ring parameters are within limits */
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if (ringparam.rx_pending > ringparam.rx_max_pending)
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err_attr = tb[ETHTOOL_A_RINGS_RX];
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else if (ringparam.rx_mini_pending > ringparam.rx_mini_max_pending)
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err_attr = tb[ETHTOOL_A_RINGS_RX_MINI];
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else if (ringparam.rx_jumbo_pending > ringparam.rx_jumbo_max_pending)
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err_attr = tb[ETHTOOL_A_RINGS_RX_JUMBO];
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else if (ringparam.tx_pending > ringparam.tx_max_pending)
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err_attr = tb[ETHTOOL_A_RINGS_TX];
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else
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err_attr = NULL;
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if (err_attr) {
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NL_SET_ERR_MSG_ATTR(info->extack, err_attr,
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"requested ring size exceeds maximum");
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return -EINVAL;
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}
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if (kernel_ringparam.tx_push_buf_len > kernel_ringparam.tx_push_buf_max_len) {
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NL_SET_ERR_MSG_ATTR_FMT(info->extack, tb[ETHTOOL_A_RINGS_TX_PUSH_BUF_LEN],
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"Requested TX push buffer exceeds the maximum of %u",
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kernel_ringparam.tx_push_buf_max_len);
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return -EINVAL;
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}
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ret = dev->ethtool_ops->set_ringparam(dev, &ringparam,
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&kernel_ringparam, info->extack);
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return ret < 0 ? ret : 1;
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}
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const struct ethnl_request_ops ethnl_rings_request_ops = {
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.request_cmd = ETHTOOL_MSG_RINGS_GET,
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.reply_cmd = ETHTOOL_MSG_RINGS_GET_REPLY,
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.hdr_attr = ETHTOOL_A_RINGS_HEADER,
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.req_info_size = sizeof(struct rings_req_info),
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.reply_data_size = sizeof(struct rings_reply_data),
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.prepare_data = rings_prepare_data,
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.reply_size = rings_reply_size,
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.fill_reply = rings_fill_reply,
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.set_validate = ethnl_set_rings_validate,
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.set = ethnl_set_rings,
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.set_ntf_cmd = ETHTOOL_MSG_RINGS_NTF,
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};
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