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authorMichal Kubecek <mkubecek@suse.cz>2020-03-12 21:07:48 +0100
committerDavid S. Miller <davem@davemloft.net>2020-03-12 15:32:32 -0700
commit0524399d4612f5af38b8383680dde4df4bc4eea2 (patch)
tree51a18d7838cbc3afc02649894b5a18f7f99bfe5d /net/ethtool
parentf70bb06563ed07e4ba064f2785dba0bef96cd449 (diff)
downloadlinux-0524399d4612f5af38b8383680dde4df4bc4eea2.tar.bz2
ethtool: provide netdev features with FEATURES_GET request
Implement FEATURES_GET request to get network device features. These are traditionally available via ETHTOOL_GFEATURES ioctl request. v2: - style cleanup suggested by Jakub Kicinski Signed-off-by: Michal Kubecek <mkubecek@suse.cz> Reviewed-by: Jakub Kicinski <kuba@kernel.org> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ethtool')
-rw-r--r--net/ethtool/Makefile2
-rw-r--r--net/ethtool/common.h2
-rw-r--r--net/ethtool/features.c131
-rw-r--r--net/ethtool/ioctl.c2
-rw-r--r--net/ethtool/netlink.c8
-rw-r--r--net/ethtool/netlink.h1
6 files changed, 143 insertions, 3 deletions
diff --git a/net/ethtool/Makefile b/net/ethtool/Makefile
index 424545a4aaec..5be8c9ab26d1 100644
--- a/net/ethtool/Makefile
+++ b/net/ethtool/Makefile
@@ -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
+ linkstate.o debug.o wol.o features.o
diff --git a/net/ethtool/common.h b/net/ethtool/common.h
index 40ba74e0b9bb..7dc1163800a7 100644
--- a/net/ethtool/common.h
+++ b/net/ethtool/common.h
@@ -6,6 +6,8 @@
#include <linux/netdevice.h>
#include <linux/ethtool.h>
+#define ETHTOOL_DEV_FEATURE_WORDS DIV_ROUND_UP(NETDEV_FEATURE_COUNT, 32)
+
/* compose link mode index from speed, type and duplex */
#define ETHTOOL_LINK_MODE(speed, type, duplex) \
ETHTOOL_LINK_MODE_ ## speed ## base ## type ## _ ## duplex ## _BIT
diff --git a/net/ethtool/features.c b/net/ethtool/features.c
new file mode 100644
index 000000000000..a0cc2b969053
--- /dev/null
+++ b/net/ethtool/features.c
@@ -0,0 +1,131 @@
+// SPDX-License-Identifier: GPL-2.0-only
+
+#include "netlink.h"
+#include "common.h"
+#include "bitset.h"
+
+struct features_req_info {
+ struct ethnl_req_info base;
+};
+
+struct features_reply_data {
+ struct ethnl_reply_data base;
+ u32 hw[ETHTOOL_DEV_FEATURE_WORDS];
+ u32 wanted[ETHTOOL_DEV_FEATURE_WORDS];
+ u32 active[ETHTOOL_DEV_FEATURE_WORDS];
+ u32 nochange[ETHTOOL_DEV_FEATURE_WORDS];
+ u32 all[ETHTOOL_DEV_FEATURE_WORDS];
+};
+
+#define FEATURES_REPDATA(__reply_base) \
+ container_of(__reply_base, struct features_reply_data, base)
+
+static const struct nla_policy
+features_get_policy[ETHTOOL_A_FEATURES_MAX + 1] = {
+ [ETHTOOL_A_FEATURES_UNSPEC] = { .type = NLA_REJECT },
+ [ETHTOOL_A_FEATURES_HEADER] = { .type = NLA_NESTED },
+ [ETHTOOL_A_FEATURES_HW] = { .type = NLA_REJECT },
+ [ETHTOOL_A_FEATURES_WANTED] = { .type = NLA_REJECT },
+ [ETHTOOL_A_FEATURES_ACTIVE] = { .type = NLA_REJECT },
+ [ETHTOOL_A_FEATURES_NOCHANGE] = { .type = NLA_REJECT },
+};
+
+static void ethnl_features_to_bitmap32(u32 *dest, netdev_features_t src)
+{
+ unsigned int i;
+
+ for (i = 0; i < ETHTOOL_DEV_FEATURE_WORDS; i++)
+ dest[i] = src >> (32 * i);
+}
+
+static int features_prepare_data(const struct ethnl_req_info *req_base,
+ struct ethnl_reply_data *reply_base,
+ struct genl_info *info)
+{
+ struct features_reply_data *data = FEATURES_REPDATA(reply_base);
+ struct net_device *dev = reply_base->dev;
+ netdev_features_t all_features;
+
+ ethnl_features_to_bitmap32(data->hw, dev->hw_features);
+ ethnl_features_to_bitmap32(data->wanted, dev->wanted_features);
+ ethnl_features_to_bitmap32(data->active, dev->features);
+ ethnl_features_to_bitmap32(data->nochange, NETIF_F_NEVER_CHANGE);
+ all_features = GENMASK_ULL(NETDEV_FEATURE_COUNT - 1, 0);
+ ethnl_features_to_bitmap32(data->all, all_features);
+
+ return 0;
+}
+
+static int features_reply_size(const struct ethnl_req_info *req_base,
+ const struct ethnl_reply_data *reply_base)
+{
+ const struct features_reply_data *data = FEATURES_REPDATA(reply_base);
+ bool compact = req_base->flags & ETHTOOL_FLAG_COMPACT_BITSETS;
+ unsigned int len = 0;
+ int ret;
+
+ ret = ethnl_bitset32_size(data->hw, data->all, NETDEV_FEATURE_COUNT,
+ netdev_features_strings, compact);
+ if (ret < 0)
+ return ret;
+ len += ret;
+ ret = ethnl_bitset32_size(data->wanted, NULL, NETDEV_FEATURE_COUNT,
+ netdev_features_strings, compact);
+ if (ret < 0)
+ return ret;
+ len += ret;
+ ret = ethnl_bitset32_size(data->active, NULL, NETDEV_FEATURE_COUNT,
+ netdev_features_strings, compact);
+ if (ret < 0)
+ return ret;
+ len += ret;
+ ret = ethnl_bitset32_size(data->nochange, NULL, NETDEV_FEATURE_COUNT,
+ netdev_features_strings, compact);
+ if (ret < 0)
+ return ret;
+ len += ret;
+
+ return len;
+}
+
+static int features_fill_reply(struct sk_buff *skb,
+ const struct ethnl_req_info *req_base,
+ const struct ethnl_reply_data *reply_base)
+{
+ const struct features_reply_data *data = FEATURES_REPDATA(reply_base);
+ bool compact = req_base->flags & ETHTOOL_FLAG_COMPACT_BITSETS;
+ int ret;
+
+ ret = ethnl_put_bitset32(skb, ETHTOOL_A_FEATURES_HW, data->hw,
+ data->all, NETDEV_FEATURE_COUNT,
+ netdev_features_strings, compact);
+ if (ret < 0)
+ return ret;
+ ret = ethnl_put_bitset32(skb, ETHTOOL_A_FEATURES_WANTED, data->wanted,
+ NULL, NETDEV_FEATURE_COUNT,
+ netdev_features_strings, compact);
+ if (ret < 0)
+ return ret;
+ ret = ethnl_put_bitset32(skb, ETHTOOL_A_FEATURES_ACTIVE, data->active,
+ NULL, NETDEV_FEATURE_COUNT,
+ netdev_features_strings, compact);
+ if (ret < 0)
+ return ret;
+ return ethnl_put_bitset32(skb, ETHTOOL_A_FEATURES_NOCHANGE,
+ data->nochange, NULL, NETDEV_FEATURE_COUNT,
+ netdev_features_strings, compact);
+}
+
+const struct ethnl_request_ops ethnl_features_request_ops = {
+ .request_cmd = ETHTOOL_MSG_FEATURES_GET,
+ .reply_cmd = ETHTOOL_MSG_FEATURES_GET_REPLY,
+ .hdr_attr = ETHTOOL_A_FEATURES_HEADER,
+ .max_attr = ETHTOOL_A_FEATURES_MAX,
+ .req_info_size = sizeof(struct features_req_info),
+ .reply_data_size = sizeof(struct features_reply_data),
+ .request_policy = features_get_policy,
+
+ .prepare_data = features_prepare_data,
+ .reply_size = features_reply_size,
+ .fill_reply = features_fill_reply,
+};
diff --git a/net/ethtool/ioctl.c b/net/ethtool/ioctl.c
index ae97c82c7052..45d1bf1764b7 100644
--- a/net/ethtool/ioctl.c
+++ b/net/ethtool/ioctl.c
@@ -56,8 +56,6 @@ EXPORT_SYMBOL(ethtool_op_get_ts_info);
/* Handlers for each ethtool command */
-#define ETHTOOL_DEV_FEATURE_WORDS ((NETDEV_FEATURE_COUNT + 31) / 32)
-
static int ethtool_get_features(struct net_device *dev, void __user *useraddr)
{
struct ethtool_gfeatures cmd = {
diff --git a/net/ethtool/netlink.c b/net/ethtool/netlink.c
index 8eca55122ef3..e451a75e9577 100644
--- a/net/ethtool/netlink.c
+++ b/net/ethtool/netlink.c
@@ -215,6 +215,7 @@ ethnl_default_requests[__ETHTOOL_MSG_USER_CNT] = {
[ETHTOOL_MSG_LINKSTATE_GET] = &ethnl_linkstate_request_ops,
[ETHTOOL_MSG_DEBUG_GET] = &ethnl_debug_request_ops,
[ETHTOOL_MSG_WOL_GET] = &ethnl_wol_request_ops,
+ [ETHTOOL_MSG_FEATURES_GET] = &ethnl_features_request_ops,
};
static struct ethnl_dump_ctx *ethnl_dump_context(struct netlink_callback *cb)
@@ -695,6 +696,13 @@ static const struct genl_ops ethtool_genl_ops[] = {
.flags = GENL_UNS_ADMIN_PERM,
.doit = ethnl_set_wol,
},
+ {
+ .cmd = ETHTOOL_MSG_FEATURES_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[] = {
diff --git a/net/ethtool/netlink.h b/net/ethtool/netlink.h
index 961708290074..be2325ea8493 100644
--- a/net/ethtool/netlink.h
+++ b/net/ethtool/netlink.h
@@ -337,6 +337,7 @@ extern const struct ethnl_request_ops ethnl_linkmodes_request_ops;
extern const struct ethnl_request_ops ethnl_linkstate_request_ops;
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;
int ethnl_set_linkinfo(struct sk_buff *skb, struct genl_info *info);
int ethnl_set_linkmodes(struct sk_buff *skb, struct genl_info *info);