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ethtool: provide private flags with PRIVFLAGS_GET request
Implement PRIVFLAGS_GET request to get private flags for a network device. These are traditionally available via ETHTOOL_GPFLAGS ioctl request. Signed-off-by: Michal Kubecek <[email protected]> Reviewed-by: Jakub Kicinski <[email protected]> Signed-off-by: David S. Miller <[email protected]>
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Original file line number | Diff line number | Diff line change |
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// SPDX-License-Identifier: GPL-2.0-only | ||
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#include "netlink.h" | ||
#include "common.h" | ||
#include "bitset.h" | ||
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struct privflags_req_info { | ||
struct ethnl_req_info base; | ||
}; | ||
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struct privflags_reply_data { | ||
struct ethnl_reply_data base; | ||
const char (*priv_flag_names)[ETH_GSTRING_LEN]; | ||
unsigned int n_priv_flags; | ||
u32 priv_flags; | ||
}; | ||
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#define PRIVFLAGS_REPDATA(__reply_base) \ | ||
container_of(__reply_base, struct privflags_reply_data, base) | ||
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static const struct nla_policy | ||
privflags_get_policy[ETHTOOL_A_PRIVFLAGS_MAX + 1] = { | ||
[ETHTOOL_A_PRIVFLAGS_UNSPEC] = { .type = NLA_REJECT }, | ||
[ETHTOOL_A_PRIVFLAGS_HEADER] = { .type = NLA_NESTED }, | ||
[ETHTOOL_A_PRIVFLAGS_FLAGS] = { .type = NLA_REJECT }, | ||
}; | ||
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static int ethnl_get_priv_flags_info(struct net_device *dev, | ||
unsigned int *count, | ||
const char (**names)[ETH_GSTRING_LEN]) | ||
{ | ||
const struct ethtool_ops *ops = dev->ethtool_ops; | ||
int nflags; | ||
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nflags = ops->get_sset_count(dev, ETH_SS_PRIV_FLAGS); | ||
if (nflags < 0) | ||
return nflags; | ||
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if (names) { | ||
*names = kcalloc(nflags, ETH_GSTRING_LEN, GFP_KERNEL); | ||
if (!*names) | ||
return -ENOMEM; | ||
ops->get_strings(dev, ETH_SS_PRIV_FLAGS, (u8 *)*names); | ||
} | ||
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/* We can pass more than 32 private flags to userspace via netlink but | ||
* we cannot get more with ethtool_ops::get_priv_flags(). Note that we | ||
* must not adjust nflags before allocating the space for flag names | ||
* as the buffer must be large enough for all flags. | ||
*/ | ||
if (WARN_ONCE(nflags > 32, | ||
"device %s reports more than 32 private flags (%d)\n", | ||
netdev_name(dev), nflags)) | ||
nflags = 32; | ||
*count = nflags; | ||
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return 0; | ||
} | ||
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static int privflags_prepare_data(const struct ethnl_req_info *req_base, | ||
struct ethnl_reply_data *reply_base, | ||
struct genl_info *info) | ||
{ | ||
struct privflags_reply_data *data = PRIVFLAGS_REPDATA(reply_base); | ||
struct net_device *dev = reply_base->dev; | ||
const char (*names)[ETH_GSTRING_LEN]; | ||
const struct ethtool_ops *ops; | ||
unsigned int nflags; | ||
int ret; | ||
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ops = dev->ethtool_ops; | ||
if (!ops->get_priv_flags || !ops->get_sset_count || !ops->get_strings) | ||
return -EOPNOTSUPP; | ||
ret = ethnl_ops_begin(dev); | ||
if (ret < 0) | ||
return ret; | ||
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ret = ethnl_get_priv_flags_info(dev, &nflags, &names); | ||
if (ret < 0) | ||
goto out_ops; | ||
data->priv_flags = ops->get_priv_flags(dev); | ||
data->priv_flag_names = names; | ||
data->n_priv_flags = nflags; | ||
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out_ops: | ||
ethnl_ops_complete(dev); | ||
return ret; | ||
} | ||
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static int privflags_reply_size(const struct ethnl_req_info *req_base, | ||
const struct ethnl_reply_data *reply_base) | ||
{ | ||
const struct privflags_reply_data *data = PRIVFLAGS_REPDATA(reply_base); | ||
bool compact = req_base->flags & ETHTOOL_FLAG_COMPACT_BITSETS; | ||
const u32 all_flags = ~(u32)0 >> (32 - data->n_priv_flags); | ||
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return ethnl_bitset32_size(&data->priv_flags, &all_flags, | ||
data->n_priv_flags, | ||
data->priv_flag_names, compact); | ||
} | ||
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static int privflags_fill_reply(struct sk_buff *skb, | ||
const struct ethnl_req_info *req_base, | ||
const struct ethnl_reply_data *reply_base) | ||
{ | ||
const struct privflags_reply_data *data = PRIVFLAGS_REPDATA(reply_base); | ||
bool compact = req_base->flags & ETHTOOL_FLAG_COMPACT_BITSETS; | ||
const u32 all_flags = ~(u32)0 >> (32 - data->n_priv_flags); | ||
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return ethnl_put_bitset32(skb, ETHTOOL_A_PRIVFLAGS_FLAGS, | ||
&data->priv_flags, &all_flags, | ||
data->n_priv_flags, data->priv_flag_names, | ||
compact); | ||
} | ||
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static void privflags_cleanup_data(struct ethnl_reply_data *reply_data) | ||
{ | ||
struct privflags_reply_data *data = PRIVFLAGS_REPDATA(reply_data); | ||
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kfree(data->priv_flag_names); | ||
} | ||
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const struct ethnl_request_ops ethnl_privflags_request_ops = { | ||
.request_cmd = ETHTOOL_MSG_PRIVFLAGS_GET, | ||
.reply_cmd = ETHTOOL_MSG_PRIVFLAGS_GET_REPLY, | ||
.hdr_attr = ETHTOOL_A_PRIVFLAGS_HEADER, | ||
.max_attr = ETHTOOL_A_PRIVFLAGS_MAX, | ||
.req_info_size = sizeof(struct privflags_req_info), | ||
.reply_data_size = sizeof(struct privflags_reply_data), | ||
.request_policy = privflags_get_policy, | ||
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.prepare_data = privflags_prepare_data, | ||
.reply_size = privflags_reply_size, | ||
.fill_reply = privflags_fill_reply, | ||
.cleanup_data = privflags_cleanup_data, | ||
}; |