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https://github.com/torvalds/linux
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0c84979c95
Implement CHANNELS_GET request to get channel counts of a network device. These are traditionally available via ETHTOOL_GCHANNELS ioctl request. Omit attributes for channel types which are not supported by driver or device (zero reported for maximum). v2: (all suggested by Jakub Kicinski) - minor cleanup in channels_prepare_data() - more descriptive channels_reply_size() - omit attributes with zero max count Signed-off-by: Michal Kubecek <mkubecek@suse.cz> Reviewed-by: Jakub Kicinski <kuba@kernel.org> Signed-off-by: David S. Miller <davem@davemloft.net>
109 lines
3.7 KiB
C
109 lines
3.7 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 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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static const struct nla_policy
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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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.max_attr = ETHTOOL_A_CHANNELS_MAX,
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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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.request_policy = channels_get_policy,
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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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