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4f30974feb
Wire up policies for get commands in struct nla_policy of the ethtool family. Make use of genetlink code attr validation and parsing, as well as allow dumping policies to user space. For every ETHTOOL_MSG_*_GET: - add 'ethnl_' prefix to policy name - add extern declaration in net/ethtool/netlink.h - wire up the policy & attr in ethtool_genl_ops[]. - remove .request_policy and .max_attr from ethnl_request_ops. Obviously core only records the first "layer" of parsed attrs so we still need to parse the sub-attrs of the nested header attribute. v2: - merge of patches 1 and 2 from v1 - remove stray empty lines in ops - also remove .max_attr Signed-off-by: Jakub Kicinski <kuba@kernel.org> Signed-off-by: David S. Miller <davem@davemloft.net>
242 lines
7.8 KiB
C
242 lines
7.8 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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#include <net/xdp_sock_drv.h>
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#include "netlink.h"
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#include "common.h"
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struct channels_req_info {
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struct ethnl_req_info base;
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};
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struct channels_reply_data {
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struct ethnl_reply_data base;
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struct ethtool_channels channels;
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};
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#define CHANNELS_REPDATA(__reply_base) \
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container_of(__reply_base, struct channels_reply_data, base)
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const struct nla_policy
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ethnl_channels_get_policy[ETHTOOL_A_CHANNELS_MAX + 1] = {
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[ETHTOOL_A_CHANNELS_UNSPEC] = { .type = NLA_REJECT },
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[ETHTOOL_A_CHANNELS_HEADER] = { .type = NLA_NESTED },
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[ETHTOOL_A_CHANNELS_RX_MAX] = { .type = NLA_REJECT },
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[ETHTOOL_A_CHANNELS_TX_MAX] = { .type = NLA_REJECT },
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[ETHTOOL_A_CHANNELS_OTHER_MAX] = { .type = NLA_REJECT },
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[ETHTOOL_A_CHANNELS_COMBINED_MAX] = { .type = NLA_REJECT },
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[ETHTOOL_A_CHANNELS_RX_COUNT] = { .type = NLA_REJECT },
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[ETHTOOL_A_CHANNELS_TX_COUNT] = { .type = NLA_REJECT },
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[ETHTOOL_A_CHANNELS_OTHER_COUNT] = { .type = NLA_REJECT },
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[ETHTOOL_A_CHANNELS_COMBINED_COUNT] = { .type = NLA_REJECT },
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};
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static int channels_prepare_data(const struct ethnl_req_info *req_base,
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struct ethnl_reply_data *reply_base,
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struct genl_info *info)
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{
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struct channels_reply_data *data = CHANNELS_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_channels)
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return -EOPNOTSUPP;
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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_channels(dev, &data->channels);
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ethnl_ops_complete(dev);
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return 0;
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}
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static int channels_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)) + /* _CHANNELS_RX_MAX */
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nla_total_size(sizeof(u32)) + /* _CHANNELS_TX_MAX */
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nla_total_size(sizeof(u32)) + /* _CHANNELS_OTHER_MAX */
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nla_total_size(sizeof(u32)) + /* _CHANNELS_COMBINED_MAX */
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nla_total_size(sizeof(u32)) + /* _CHANNELS_RX_COUNT */
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nla_total_size(sizeof(u32)) + /* _CHANNELS_TX_COUNT */
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nla_total_size(sizeof(u32)) + /* _CHANNELS_OTHER_COUNT */
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nla_total_size(sizeof(u32)); /* _CHANNELS_COMBINED_COUNT */
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}
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static int channels_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 channels_reply_data *data = CHANNELS_REPDATA(reply_base);
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const struct ethtool_channels *channels = &data->channels;
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if ((channels->max_rx &&
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(nla_put_u32(skb, ETHTOOL_A_CHANNELS_RX_MAX,
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channels->max_rx) ||
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nla_put_u32(skb, ETHTOOL_A_CHANNELS_RX_COUNT,
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channels->rx_count))) ||
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(channels->max_tx &&
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(nla_put_u32(skb, ETHTOOL_A_CHANNELS_TX_MAX,
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channels->max_tx) ||
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nla_put_u32(skb, ETHTOOL_A_CHANNELS_TX_COUNT,
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channels->tx_count))) ||
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(channels->max_other &&
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(nla_put_u32(skb, ETHTOOL_A_CHANNELS_OTHER_MAX,
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channels->max_other) ||
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nla_put_u32(skb, ETHTOOL_A_CHANNELS_OTHER_COUNT,
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channels->other_count))) ||
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(channels->max_combined &&
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(nla_put_u32(skb, ETHTOOL_A_CHANNELS_COMBINED_MAX,
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channels->max_combined) ||
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nla_put_u32(skb, ETHTOOL_A_CHANNELS_COMBINED_COUNT,
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channels->combined_count))))
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return -EMSGSIZE;
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return 0;
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}
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const struct ethnl_request_ops ethnl_channels_request_ops = {
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.request_cmd = ETHTOOL_MSG_CHANNELS_GET,
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.reply_cmd = ETHTOOL_MSG_CHANNELS_GET_REPLY,
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.hdr_attr = ETHTOOL_A_CHANNELS_HEADER,
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.req_info_size = sizeof(struct channels_req_info),
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.reply_data_size = sizeof(struct channels_reply_data),
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.prepare_data = channels_prepare_data,
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.reply_size = channels_reply_size,
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.fill_reply = channels_fill_reply,
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};
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/* CHANNELS_SET */
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static const struct nla_policy
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channels_set_policy[ETHTOOL_A_CHANNELS_MAX + 1] = {
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[ETHTOOL_A_CHANNELS_UNSPEC] = { .type = NLA_REJECT },
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[ETHTOOL_A_CHANNELS_HEADER] = { .type = NLA_NESTED },
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[ETHTOOL_A_CHANNELS_RX_MAX] = { .type = NLA_REJECT },
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[ETHTOOL_A_CHANNELS_TX_MAX] = { .type = NLA_REJECT },
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[ETHTOOL_A_CHANNELS_OTHER_MAX] = { .type = NLA_REJECT },
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[ETHTOOL_A_CHANNELS_COMBINED_MAX] = { .type = NLA_REJECT },
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[ETHTOOL_A_CHANNELS_RX_COUNT] = { .type = NLA_U32 },
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[ETHTOOL_A_CHANNELS_TX_COUNT] = { .type = NLA_U32 },
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[ETHTOOL_A_CHANNELS_OTHER_COUNT] = { .type = NLA_U32 },
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[ETHTOOL_A_CHANNELS_COMBINED_COUNT] = { .type = NLA_U32 },
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};
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int ethnl_set_channels(struct sk_buff *skb, struct genl_info *info)
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{
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struct nlattr *tb[ETHTOOL_A_CHANNELS_MAX + 1];
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unsigned int from_channel, old_total, i;
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bool mod = false, mod_combined = false;
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struct ethtool_channels channels = {};
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struct ethnl_req_info req_info = {};
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const struct nlattr *err_attr;
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const struct ethtool_ops *ops;
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struct net_device *dev;
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u32 max_rx_in_use = 0;
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int ret;
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ret = nlmsg_parse(info->nlhdr, GENL_HDRLEN, tb,
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ETHTOOL_A_CHANNELS_MAX, channels_set_policy,
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info->extack);
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if (ret < 0)
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return ret;
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ret = ethnl_parse_header_dev_get(&req_info,
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tb[ETHTOOL_A_CHANNELS_HEADER],
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genl_info_net(info), info->extack,
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true);
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if (ret < 0)
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return ret;
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dev = req_info.dev;
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ops = dev->ethtool_ops;
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ret = -EOPNOTSUPP;
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if (!ops->get_channels || !ops->set_channels)
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goto out_dev;
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rtnl_lock();
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ret = ethnl_ops_begin(dev);
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if (ret < 0)
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goto out_rtnl;
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ops->get_channels(dev, &channels);
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old_total = channels.combined_count +
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max(channels.rx_count, channels.tx_count);
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ethnl_update_u32(&channels.rx_count, tb[ETHTOOL_A_CHANNELS_RX_COUNT],
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&mod);
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ethnl_update_u32(&channels.tx_count, tb[ETHTOOL_A_CHANNELS_TX_COUNT],
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&mod);
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ethnl_update_u32(&channels.other_count,
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tb[ETHTOOL_A_CHANNELS_OTHER_COUNT], &mod);
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ethnl_update_u32(&channels.combined_count,
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tb[ETHTOOL_A_CHANNELS_COMBINED_COUNT], &mod_combined);
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mod |= mod_combined;
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ret = 0;
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if (!mod)
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goto out_ops;
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/* ensure new channel counts are within limits */
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if (channels.rx_count > channels.max_rx)
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err_attr = tb[ETHTOOL_A_CHANNELS_RX_COUNT];
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else if (channels.tx_count > channels.max_tx)
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err_attr = tb[ETHTOOL_A_CHANNELS_TX_COUNT];
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else if (channels.other_count > channels.max_other)
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err_attr = tb[ETHTOOL_A_CHANNELS_OTHER_COUNT];
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else if (channels.combined_count > channels.max_combined)
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err_attr = tb[ETHTOOL_A_CHANNELS_COMBINED_COUNT];
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else
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err_attr = NULL;
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if (err_attr) {
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ret = -EINVAL;
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NL_SET_ERR_MSG_ATTR(info->extack, err_attr,
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"requested channel count exceeds maximum");
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goto out_ops;
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}
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/* ensure there is at least one RX and one TX channel */
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if (!channels.combined_count && !channels.rx_count)
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err_attr = tb[ETHTOOL_A_CHANNELS_RX_COUNT];
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else if (!channels.combined_count && !channels.tx_count)
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err_attr = tb[ETHTOOL_A_CHANNELS_TX_COUNT];
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else
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err_attr = NULL;
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if (err_attr) {
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if (mod_combined)
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err_attr = tb[ETHTOOL_A_CHANNELS_COMBINED_COUNT];
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ret = -EINVAL;
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NL_SET_ERR_MSG_ATTR(info->extack, err_attr, "requested channel counts would result in no RX or TX channel being configured");
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goto out_ops;
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}
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/* ensure the new Rx count fits within the configured Rx flow
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* indirection table settings
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*/
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if (netif_is_rxfh_configured(dev) &&
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!ethtool_get_max_rxfh_channel(dev, &max_rx_in_use) &&
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(channels.combined_count + channels.rx_count) <= max_rx_in_use) {
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GENL_SET_ERR_MSG(info, "requested channel counts are too low for existing indirection table settings");
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return -EINVAL;
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}
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/* Disabling channels, query zero-copy AF_XDP sockets */
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from_channel = channels.combined_count +
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min(channels.rx_count, channels.tx_count);
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for (i = from_channel; i < old_total; i++)
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if (xsk_get_pool_from_qid(dev, i)) {
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GENL_SET_ERR_MSG(info, "requested channel counts are too low for existing zerocopy AF_XDP sockets");
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return -EINVAL;
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}
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ret = dev->ethtool_ops->set_channels(dev, &channels);
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if (ret < 0)
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goto out_ops;
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ethtool_notify(dev, ETHTOOL_MSG_CHANNELS_NTF, NULL);
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out_ops:
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ethnl_ops_complete(dev);
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out_rtnl:
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rtnl_unlock();
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out_dev:
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dev_put(dev);
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return ret;
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}
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