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// SPDX-License-Identifier: GPL-2.0-only
#include "netlink.h"
#include "common.h"
struct rss_req_info {
struct ethnl_req_info base;
u32 rss_context;
};
struct rss_reply_data {
struct ethnl_reply_data base;
u32 indir_size;
u32 hkey_size;
u32 hfunc;
u32 *indir_table;
u8 *hkey;
};
#define RSS_REQINFO(__req_base) \
container_of(__req_base, struct rss_req_info, base)
#define RSS_REPDATA(__reply_base) \
container_of(__reply_base, struct rss_reply_data, base)
const struct nla_policy ethnl_rss_get_policy[] = {
[ETHTOOL_A_RSS_HEADER] = NLA_POLICY_NESTED(ethnl_header_policy),
[ETHTOOL_A_RSS_CONTEXT] = { .type = NLA_U32 },
};
static int
rss_parse_request(struct ethnl_req_info *req_info, struct nlattr **tb,
struct netlink_ext_ack *extack)
{
struct rss_req_info *request = RSS_REQINFO(req_info);
if (tb[ETHTOOL_A_RSS_CONTEXT])
request->rss_context = nla_get_u32(tb[ETHTOOL_A_RSS_CONTEXT]);
return 0;
}
static int
rss_prepare_data(const struct ethnl_req_info *req_base,
struct ethnl_reply_data *reply_base, struct genl_info *info)
{
struct rss_reply_data *data = RSS_REPDATA(reply_base);
struct rss_req_info *request = RSS_REQINFO(req_base);
struct net_device *dev = reply_base->dev;
const struct ethtool_ops *ops;
u32 total_size, indir_bytes;
u8 dev_hfunc = 0;
u8 *rss_config;
int ret;
ops = dev->ethtool_ops;
if (!ops->get_rxfh)
return -EOPNOTSUPP;
/* Some drivers don't handle rss_context */
if (request->rss_context && !ops->get_rxfh_context)
return -EOPNOTSUPP;
ret = ethnl_ops_begin(dev);
if (ret < 0)
return ret;
data->indir_size = 0;
data->hkey_size = 0;
if (ops->get_rxfh_indir_size)
data->indir_size = ops->get_rxfh_indir_size(dev);
if (ops->get_rxfh_key_size)
data->hkey_size = ops->get_rxfh_key_size(dev);
indir_bytes = data->indir_size * sizeof(u32);
total_size = indir_bytes + data->hkey_size;
rss_config = kzalloc(total_size, GFP_KERNEL);
if (!rss_config) {
ret = -ENOMEM;
goto out_ops;
}
if (data->indir_size)
data->indir_table = (u32 *)rss_config;
if (data->hkey_size)
data->hkey = rss_config + indir_bytes;
if (request->rss_context)
ret = ops->get_rxfh_context(dev, data->indir_table, data->hkey,
&dev_hfunc, request->rss_context);
else
ret = ops->get_rxfh(dev, data->indir_table, data->hkey,
&dev_hfunc);
if (ret)
goto out_ops;
data->hfunc = dev_hfunc;
out_ops:
ethnl_ops_complete(dev);
return ret;
}
static int
rss_reply_size(const struct ethnl_req_info *req_base,
const struct ethnl_reply_data *reply_base)
{
const struct rss_reply_data *data = RSS_REPDATA(reply_base);
int len;
len = nla_total_size(sizeof(u32)) + /* _RSS_HFUNC */
nla_total_size(sizeof(u32) * data->indir_size) + /* _RSS_INDIR */
nla_total_size(data->hkey_size); /* _RSS_HKEY */
return len;
}
static int
rss_fill_reply(struct sk_buff *skb, const struct ethnl_req_info *req_base,
const struct ethnl_reply_data *reply_base)
{
const struct rss_reply_data *data = RSS_REPDATA(reply_base);
if (nla_put_u32(skb, ETHTOOL_A_RSS_HFUNC, data->hfunc) ||
nla_put(skb, ETHTOOL_A_RSS_INDIR,
sizeof(u32) * data->indir_size, data->indir_table) ||
nla_put(skb, ETHTOOL_A_RSS_HKEY, data->hkey_size, data->hkey))
return -EMSGSIZE;
return 0;
}
static void rss_cleanup_data(struct ethnl_reply_data *reply_base)
{
const struct rss_reply_data *data = RSS_REPDATA(reply_base);
kfree(data->indir_table);
}
const struct ethnl_request_ops ethnl_rss_request_ops = {
.request_cmd = ETHTOOL_MSG_RSS_GET,
.reply_cmd = ETHTOOL_MSG_RSS_GET_REPLY,
.hdr_attr = ETHTOOL_A_RSS_HEADER,
.req_info_size = sizeof(struct rss_req_info),
.reply_data_size = sizeof(struct rss_reply_data),
.parse_request = rss_parse_request,
.prepare_data = rss_prepare_data,
.reply_size = rss_reply_size,
.fill_reply = rss_fill_reply,
.cleanup_data = rss_cleanup_data,
};
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