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ethtool: provide ring sizes with RINGS_GET request

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Implement RINGS_GET request to get ring sizes of a network device. These
are traditionally available via ETHTOOL_GRINGPARAM ioctl request.

Omit attributes for ring types which are not supported by driver or device
(zero reported for maximum).

v2: (all suggested by Jakub Kicinski)
  - minor cleanup in rings_prepare_data()
  - more descriptive rings_reply_size()
  - omit attributes with zero max size

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 21:08:23 +01:00
committed by David S. Miller
parent 111dcba3c6
commit e4a1717b67
6 changed files with 168 additions and 2 deletions
Download Patch File Download Diff File Expand all files Collapse all files

2
net/ethtool/Makefile
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@@ -5,4 +5,4 @@ obj-y += ioctl.o common.o
obj-$(CONFIG_ETHTOOL_NETLINK) += ethtool_nl.o
ethtool_nl-y := netlink.o bitset.o strset.o linkinfo.o linkmodes.o \
linkstate.o debug.o wol.o features.o privflags.o
linkstate.o debug.o wol.o features.o privflags.o rings.o

8
net/ethtool/netlink.c
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@@ -217,6 +217,7 @@ ethnl_default_requests[__ETHTOOL_MSG_USER_CNT] = {
[ETHTOOL_MSG_WOL_GET] = &ethnl_wol_request_ops,
[ETHTOOL_MSG_FEATURES_GET] = &ethnl_features_request_ops,
[ETHTOOL_MSG_PRIVFLAGS_GET] = &ethnl_privflags_request_ops,
[ETHTOOL_MSG_RINGS_GET] = &ethnl_rings_request_ops,
};
static struct ethnl_dump_ctx *ethnl_dump_context(struct netlink_callback *cb)
@@ -748,6 +749,13 @@ static const struct genl_ops ethtool_genl_ops[] = {
.flags = GENL_UNS_ADMIN_PERM,
.doit = ethnl_set_privflags,
},
{
.cmd = ETHTOOL_MSG_RINGS_GET,
.doit = ethnl_default_doit,
.start = ethnl_default_start,
.dumpit = ethnl_default_dumpit,
.done = ethnl_default_done,
},
};
static const struct genl_multicast_group ethtool_nl_mcgrps[] = {

1
net/ethtool/netlink.h
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@@ -339,6 +339,7 @@ extern const struct ethnl_request_ops ethnl_debug_request_ops;
extern const struct ethnl_request_ops ethnl_wol_request_ops;
extern const struct ethnl_request_ops ethnl_features_request_ops;
extern const struct ethnl_request_ops ethnl_privflags_request_ops;
extern const struct ethnl_request_ops ethnl_rings_request_ops;
int ethnl_set_linkinfo(struct sk_buff *skb, struct genl_info *info);
int ethnl_set_linkmodes(struct sk_buff *skb, struct genl_info *info);

108
net/ethtool/rings.c Normal file
View File

@@ -0,0 +1,108 @@
// 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;
};
#define RINGS_REPDATA(__reply_base) \
container_of(__reply_base, struct rings_reply_data, base)
static const struct nla_policy
rings_get_policy[ETHTOOL_A_RINGS_MAX + 1] = {
[ETHTOOL_A_RINGS_UNSPEC] = { .type = NLA_REJECT },
[ETHTOOL_A_RINGS_HEADER] = { .type = NLA_NESTED },
[ETHTOOL_A_RINGS_RX_MAX] = { .type = NLA_REJECT },
[ETHTOOL_A_RINGS_RX_MINI_MAX] = { .type = NLA_REJECT },
[ETHTOOL_A_RINGS_RX_JUMBO_MAX] = { .type = NLA_REJECT },
[ETHTOOL_A_RINGS_TX_MAX] = { .type = NLA_REJECT },
[ETHTOOL_A_RINGS_RX] = { .type = NLA_REJECT },
[ETHTOOL_A_RINGS_RX_MINI] = { .type = NLA_REJECT },
[ETHTOOL_A_RINGS_RX_JUMBO] = { .type = NLA_REJECT },
[ETHTOOL_A_RINGS_TX] = { .type = NLA_REJECT },
};
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 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);
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 */
}
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 ethtool_ringparam *ringparam = &data->ringparam;
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))))
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,
.max_attr = ETHTOOL_A_RINGS_MAX,
.req_info_size = sizeof(struct rings_req_info),
.reply_data_size = sizeof(struct rings_reply_data),
.request_policy = rings_get_policy,
.prepare_data = rings_prepare_data,
.reply_size = rings_reply_size,
.fill_reply = rings_fill_reply,
};