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ethtool: provide channel counts with CHANNELS_GET request

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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>
This commit is contained in:
Michal Kubecek
2020-03-12 21:08:38 +01:00
committed by David S. Miller
parent bc9d1c995e
commit 0c84979c95
6 changed files with 169 additions and 2 deletions
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108
net/ethtool/channels.c Normal file
View File

@@ -0,0 +1,108 @@
// SPDX-License-Identifier: GPL-2.0-only
#include "netlink.h"
#include "common.h"
struct channels_req_info {
struct ethnl_req_info base;
};
struct channels_reply_data {
struct ethnl_reply_data base;
struct ethtool_channels channels;
};
#define CHANNELS_REPDATA(__reply_base) \
container_of(__reply_base, struct channels_reply_data, base)
static const struct nla_policy
channels_get_policy[ETHTOOL_A_CHANNELS_MAX + 1] = {
[ETHTOOL_A_CHANNELS_UNSPEC] = { .type = NLA_REJECT },
[ETHTOOL_A_CHANNELS_HEADER] = { .type = NLA_NESTED },
[ETHTOOL_A_CHANNELS_RX_MAX] = { .type = NLA_REJECT },
[ETHTOOL_A_CHANNELS_TX_MAX] = { .type = NLA_REJECT },
[ETHTOOL_A_CHANNELS_OTHER_MAX] = { .type = NLA_REJECT },
[ETHTOOL_A_CHANNELS_COMBINED_MAX] = { .type = NLA_REJECT },
[ETHTOOL_A_CHANNELS_RX_COUNT] = { .type = NLA_REJECT },
[ETHTOOL_A_CHANNELS_TX_COUNT] = { .type = NLA_REJECT },
[ETHTOOL_A_CHANNELS_OTHER_COUNT] = { .type = NLA_REJECT },
[ETHTOOL_A_CHANNELS_COMBINED_COUNT] = { .type = NLA_REJECT },
};
static int channels_prepare_data(const struct ethnl_req_info *req_base,
struct ethnl_reply_data *reply_base,
struct genl_info *info)
{
struct channels_reply_data *data = CHANNELS_REPDATA(reply_base);
struct net_device *dev = reply_base->dev;
int ret;
if (!dev->ethtool_ops->get_channels)
return -EOPNOTSUPP;
ret = ethnl_ops_begin(dev);
if (ret < 0)
return ret;
dev->ethtool_ops->get_channels(dev, &data->channels);
ethnl_ops_complete(dev);
return 0;
}
static int channels_reply_size(const struct ethnl_req_info *req_base,
const struct ethnl_reply_data *reply_base)
{
return nla_total_size(sizeof(u32)) + /* _CHANNELS_RX_MAX */
nla_total_size(sizeof(u32)) + /* _CHANNELS_TX_MAX */
nla_total_size(sizeof(u32)) + /* _CHANNELS_OTHER_MAX */
nla_total_size(sizeof(u32)) + /* _CHANNELS_COMBINED_MAX */
nla_total_size(sizeof(u32)) + /* _CHANNELS_RX_COUNT */
nla_total_size(sizeof(u32)) + /* _CHANNELS_TX_COUNT */
nla_total_size(sizeof(u32)) + /* _CHANNELS_OTHER_COUNT */
nla_total_size(sizeof(u32)); /* _CHANNELS_COMBINED_COUNT */
}
static int channels_fill_reply(struct sk_buff *skb,
const struct ethnl_req_info *req_base,
const struct ethnl_reply_data *reply_base)
{
const struct channels_reply_data *data = CHANNELS_REPDATA(reply_base);
const struct ethtool_channels *channels = &data->channels;
if ((channels->max_rx &&
(nla_put_u32(skb, ETHTOOL_A_CHANNELS_RX_MAX,
channels->max_rx) ||
nla_put_u32(skb, ETHTOOL_A_CHANNELS_RX_COUNT,
channels->rx_count))) ||
(channels->max_tx &&
(nla_put_u32(skb, ETHTOOL_A_CHANNELS_TX_MAX,
channels->max_tx) ||
nla_put_u32(skb, ETHTOOL_A_CHANNELS_TX_COUNT,
channels->tx_count))) ||
(channels->max_other &&
(nla_put_u32(skb, ETHTOOL_A_CHANNELS_OTHER_MAX,
channels->max_other) ||
nla_put_u32(skb, ETHTOOL_A_CHANNELS_OTHER_COUNT,
channels->other_count))) ||
(channels->max_combined &&
(nla_put_u32(skb, ETHTOOL_A_CHANNELS_COMBINED_MAX,
channels->max_combined) ||
nla_put_u32(skb, ETHTOOL_A_CHANNELS_COMBINED_COUNT,
channels->combined_count))))
return -EMSGSIZE;
return 0;
}
const struct ethnl_request_ops ethnl_channels_request_ops = {
.request_cmd = ETHTOOL_MSG_CHANNELS_GET,
.reply_cmd = ETHTOOL_MSG_CHANNELS_GET_REPLY,
.hdr_attr = ETHTOOL_A_CHANNELS_HEADER,
.max_attr = ETHTOOL_A_CHANNELS_MAX,
.req_info_size = sizeof(struct channels_req_info),
.reply_data_size = sizeof(struct channels_reply_data),
.request_policy = channels_get_policy,
.prepare_data = channels_prepare_data,
.reply_size = channels_reply_size,
.fill_reply = channels_fill_reply,
};