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linux/net/ethtool/rings.c
Jie Wang bde292c07b net: ethtool: move checks before rtnl_lock() in ethnl_set_rings 
Currently these two checks in ethnl_set_rings are added after rtnl_lock()
which will do useless works if the request is invalid.

So this patch moves these checks before the rtnl_lock() to avoid these
costs.

Signed-off-by: Jie Wang <wangjie125@huawei.com>
Signed-off-by: Guangbin Huang <huangguangbin2@huawei.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2022-04-15 11:41:45 -07:00

235 lines
7.5 KiB
C
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// SPDX-License-Identifier: GPL-2.0-only
#include "netlink.h"
#include "common.h"
struct rings_req_info {
struct ethnl_req_info base;
};
struct rings_reply_data {
struct ethnl_reply_data base;
struct ethtool_ringparam ringparam;
struct kernel_ethtool_ringparam kernel_ringparam;
};
#define RINGS_REPDATA(__reply_base) \
container_of(__reply_base, struct rings_reply_data, base)
const struct nla_policy ethnl_rings_get_policy[] = {
[ETHTOOL_A_RINGS_HEADER] =
NLA_POLICY_NESTED(ethnl_header_policy),
};
static int rings_prepare_data(const struct ethnl_req_info *req_base,
struct ethnl_reply_data *reply_base,
struct genl_info *info)
{
struct rings_reply_data *data = RINGS_REPDATA(reply_base);
struct netlink_ext_ack *extack = info ? info->extack : NULL;
struct net_device *dev = reply_base->dev;
int ret;
if (!dev->ethtool_ops->get_ringparam)
return -EOPNOTSUPP;
ret = ethnl_ops_begin(dev);
if (ret < 0)
return ret;
dev->ethtool_ops->get_ringparam(dev, &data->ringparam,
&data->kernel_ringparam, extack);
ethnl_ops_complete(dev);
return 0;
}
static int rings_reply_size(const struct ethnl_req_info *req_base,
const struct ethnl_reply_data *reply_base)
{
return nla_total_size(sizeof(u32)) + /* _RINGS_RX_MAX */
nla_total_size(sizeof(u32)) + /* _RINGS_RX_MINI_MAX */
nla_total_size(sizeof(u32)) + /* _RINGS_RX_JUMBO_MAX */
nla_total_size(sizeof(u32)) + /* _RINGS_TX_MAX */
nla_total_size(sizeof(u32)) + /* _RINGS_RX */
nla_total_size(sizeof(u32)) + /* _RINGS_RX_MINI */
nla_total_size(sizeof(u32)) + /* _RINGS_RX_JUMBO */
nla_total_size(sizeof(u32)) + /* _RINGS_TX */
nla_total_size(sizeof(u32)) + /* _RINGS_RX_BUF_LEN */
nla_total_size(sizeof(u8)) + /* _RINGS_TCP_DATA_SPLIT */
nla_total_size(sizeof(u32) + /* _RINGS_CQE_SIZE */
nla_total_size(sizeof(u8))); /* _RINGS_TX_PUSH */
}
static int rings_fill_reply(struct sk_buff *skb,
const struct ethnl_req_info *req_base,
const struct ethnl_reply_data *reply_base)
{
const struct rings_reply_data *data = RINGS_REPDATA(reply_base);
const struct kernel_ethtool_ringparam *kr = &data->kernel_ringparam;
const struct ethtool_ringparam *ringparam = &data->ringparam;
WARN_ON(kr->tcp_data_split > ETHTOOL_TCP_DATA_SPLIT_ENABLED);
if ((ringparam->rx_max_pending &&
(nla_put_u32(skb, ETHTOOL_A_RINGS_RX_MAX,
ringparam->rx_max_pending) ||
nla_put_u32(skb, ETHTOOL_A_RINGS_RX,
ringparam->rx_pending))) ||
(ringparam->rx_mini_max_pending &&
(nla_put_u32(skb, ETHTOOL_A_RINGS_RX_MINI_MAX,
ringparam->rx_mini_max_pending) ||
nla_put_u32(skb, ETHTOOL_A_RINGS_RX_MINI,
ringparam->rx_mini_pending))) ||
(ringparam->rx_jumbo_max_pending &&
(nla_put_u32(skb, ETHTOOL_A_RINGS_RX_JUMBO_MAX,
ringparam->rx_jumbo_max_pending) ||
nla_put_u32(skb, ETHTOOL_A_RINGS_RX_JUMBO,
ringparam->rx_jumbo_pending))) ||
(ringparam->tx_max_pending &&
(nla_put_u32(skb, ETHTOOL_A_RINGS_TX_MAX,
ringparam->tx_max_pending) ||
nla_put_u32(skb, ETHTOOL_A_RINGS_TX,
ringparam->tx_pending))) ||
(kr->rx_buf_len &&
(nla_put_u32(skb, ETHTOOL_A_RINGS_RX_BUF_LEN, kr->rx_buf_len))) ||
(kr->tcp_data_split &&
(nla_put_u8(skb, ETHTOOL_A_RINGS_TCP_DATA_SPLIT,
kr->tcp_data_split))) ||
(kr->cqe_size &&
(nla_put_u32(skb, ETHTOOL_A_RINGS_CQE_SIZE, kr->cqe_size))) ||
nla_put_u8(skb, ETHTOOL_A_RINGS_TX_PUSH, !!kr->tx_push))
return -EMSGSIZE;
return 0;
}
const struct ethnl_request_ops ethnl_rings_request_ops = {
.request_cmd = ETHTOOL_MSG_RINGS_GET,
.reply_cmd = ETHTOOL_MSG_RINGS_GET_REPLY,
.hdr_attr = ETHTOOL_A_RINGS_HEADER,
.req_info_size = sizeof(struct rings_req_info),
.reply_data_size = sizeof(struct rings_reply_data),
.prepare_data = rings_prepare_data,
.reply_size = rings_reply_size,
.fill_reply = rings_fill_reply,
};
/* RINGS_SET */
const struct nla_policy ethnl_rings_set_policy[] = {
[ETHTOOL_A_RINGS_HEADER] =
NLA_POLICY_NESTED(ethnl_header_policy),
[ETHTOOL_A_RINGS_RX] = { .type = NLA_U32 },
[ETHTOOL_A_RINGS_RX_MINI] = { .type = NLA_U32 },
[ETHTOOL_A_RINGS_RX_JUMBO] = { .type = NLA_U32 },
[ETHTOOL_A_RINGS_TX] = { .type = NLA_U32 },
[ETHTOOL_A_RINGS_RX_BUF_LEN] = NLA_POLICY_MIN(NLA_U32, 1),
[ETHTOOL_A_RINGS_CQE_SIZE] = NLA_POLICY_MIN(NLA_U32, 1),
[ETHTOOL_A_RINGS_TX_PUSH] = NLA_POLICY_MAX(NLA_U8, 1),
};
int ethnl_set_rings(struct sk_buff *skb, struct genl_info *info)
{
struct kernel_ethtool_ringparam kernel_ringparam = {};
struct ethtool_ringparam ringparam = {};
struct ethnl_req_info req_info = {};
struct nlattr **tb = info->attrs;
const struct nlattr *err_attr;
const struct ethtool_ops *ops;
struct net_device *dev;
bool mod = false;
int ret;
ret = ethnl_parse_header_dev_get(&req_info,
tb[ETHTOOL_A_RINGS_HEADER],
genl_info_net(info), info->extack,
true);
if (ret < 0)
return ret;
dev = req_info.dev;
ops = dev->ethtool_ops;
ret = -EOPNOTSUPP;
if (!ops->get_ringparam || !ops->set_ringparam)
goto out_dev;
if (tb[ETHTOOL_A_RINGS_RX_BUF_LEN] &&
!(ops->supported_ring_params & ETHTOOL_RING_USE_RX_BUF_LEN)) {
ret = -EOPNOTSUPP;
NL_SET_ERR_MSG_ATTR(info->extack,
tb[ETHTOOL_A_RINGS_RX_BUF_LEN],
"setting rx buf len not supported");
goto out_dev;
}
if (tb[ETHTOOL_A_RINGS_CQE_SIZE] &&
!(ops->supported_ring_params & ETHTOOL_RING_USE_CQE_SIZE)) {
ret = -EOPNOTSUPP;
NL_SET_ERR_MSG_ATTR(info->extack,
tb[ETHTOOL_A_RINGS_CQE_SIZE],
"setting cqe size not supported");
goto out_dev;
}
if (tb[ETHTOOL_A_RINGS_TX_PUSH] &&
!(ops->supported_ring_params & ETHTOOL_RING_USE_TX_PUSH)) {
ret = -EOPNOTSUPP;
NL_SET_ERR_MSG_ATTR(info->extack,
tb[ETHTOOL_A_RINGS_TX_PUSH],
"setting tx push not supported");
goto out_dev;
}
rtnl_lock();
ret = ethnl_ops_begin(dev);
if (ret < 0)
goto out_rtnl;
ops->get_ringparam(dev, &ringparam, &kernel_ringparam, info->extack);
ethnl_update_u32(&ringparam.rx_pending, tb[ETHTOOL_A_RINGS_RX], &mod);
ethnl_update_u32(&ringparam.rx_mini_pending,
tb[ETHTOOL_A_RINGS_RX_MINI], &mod);
ethnl_update_u32(&ringparam.rx_jumbo_pending,
tb[ETHTOOL_A_RINGS_RX_JUMBO], &mod);
ethnl_update_u32(&ringparam.tx_pending, tb[ETHTOOL_A_RINGS_TX], &mod);
ethnl_update_u32(&kernel_ringparam.rx_buf_len,
tb[ETHTOOL_A_RINGS_RX_BUF_LEN], &mod);
ethnl_update_u32(&kernel_ringparam.cqe_size,
tb[ETHTOOL_A_RINGS_CQE_SIZE], &mod);
ethnl_update_u8(&kernel_ringparam.tx_push,
tb[ETHTOOL_A_RINGS_TX_PUSH], &mod);
ret = 0;
if (!mod)
goto out_ops;
/* ensure new ring parameters are within limits */
if (ringparam.rx_pending > ringparam.rx_max_pending)
err_attr = tb[ETHTOOL_A_RINGS_RX];
else if (ringparam.rx_mini_pending > ringparam.rx_mini_max_pending)
err_attr = tb[ETHTOOL_A_RINGS_RX_MINI];
else if (ringparam.rx_jumbo_pending > ringparam.rx_jumbo_max_pending)
err_attr = tb[ETHTOOL_A_RINGS_RX_JUMBO];
else if (ringparam.tx_pending > ringparam.tx_max_pending)
err_attr = tb[ETHTOOL_A_RINGS_TX];
else
err_attr = NULL;
if (err_attr) {
ret = -EINVAL;
NL_SET_ERR_MSG_ATTR(info->extack, err_attr,
"requested ring size exceeds maximum");
goto out_ops;
}
ret = dev->ethtool_ops->set_ringparam(dev, &ringparam,
&kernel_ringparam, info->extack);
if (ret < 0)
goto out_ops;
ethtool_notify(dev, ETHTOOL_MSG_RINGS_NTF, NULL);
out_ops:
ethnl_ops_complete(dev);
out_rtnl:
rtnl_unlock();
out_dev:
ethnl_parse_header_dev_put(&req_info);
return ret;
}
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