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Message-Id: <20190115005009.16025-2-jakub.kicinski@netronome.com>
Date: Mon, 14 Jan 2019 16:50:03 -0800
From: Jakub Kicinski <jakub.kicinski@...ronome.com>
To: davem@...emloft.net
Cc: netdev@...r.kernel.org, oss-drivers@...ronome.com,
jiri@...nulli.us, Jakub Kicinski <jakub.kicinski@...ronome.com>
Subject: [RFC net-next 1/6] devlink: add device information API
ethtool -i has served us well for a long time, but its showing
its limitations more and more. The device information should
also be reported per device not per-netdev.
Lay foundation for a simple devlink-based ethtool -i replacement.
Add device serial number as initial piece of information exposed
via this standard API.
Signed-off-by: Jakub Kicinski <jakub.kicinski@...ronome.com>
---
include/net/devlink.h | 2 +
include/uapi/linux/devlink.h | 4 ++
net/core/devlink.c | 112 +++++++++++++++++++++++++++++++++++
3 files changed, 118 insertions(+)
diff --git a/include/net/devlink.h b/include/net/devlink.h
index 67f4293bc970..4358c111ce83 100644
--- a/include/net/devlink.h
+++ b/include/net/devlink.h
@@ -475,6 +475,8 @@ struct devlink_ops {
int (*eswitch_encap_mode_get)(struct devlink *devlink, u8 *p_encap_mode);
int (*eswitch_encap_mode_set)(struct devlink *devlink, u8 encap_mode,
struct netlink_ext_ack *extack);
+ int (*serial_get)(struct devlink *devlink, u8 *buf, size_t buf_len,
+ size_t *len, struct netlink_ext_ack *extack);
};
static inline void *devlink_priv(struct devlink *devlink)
diff --git a/include/uapi/linux/devlink.h b/include/uapi/linux/devlink.h
index 6e52d3660654..760c9c360330 100644
--- a/include/uapi/linux/devlink.h
+++ b/include/uapi/linux/devlink.h
@@ -89,6 +89,8 @@ enum devlink_command {
DEVLINK_CMD_REGION_DEL,
DEVLINK_CMD_REGION_READ,
+ DEVLINK_CMD_INFO_GET,
+
/* add new commands above here */
__DEVLINK_CMD_MAX,
DEVLINK_CMD_MAX = __DEVLINK_CMD_MAX - 1
@@ -285,6 +287,8 @@ enum devlink_attr {
DEVLINK_ATTR_REGION_CHUNK_ADDR, /* u64 */
DEVLINK_ATTR_REGION_CHUNK_LEN, /* u64 */
+ DEVLINK_ATTR_INFO_SERIAL_NUMBER, /* binary */
+
/* add new attributes above here, update the policy in devlink.c */
__DEVLINK_ATTR_MAX,
diff --git a/net/core/devlink.c b/net/core/devlink.c
index abb0da9d7b4b..55b7b006df28 100644
--- a/net/core/devlink.c
+++ b/net/core/devlink.c
@@ -3597,6 +3597,110 @@ static int devlink_nl_cmd_region_read_dumpit(struct sk_buff *skb,
return 0;
}
+static int devlink_nl_info_sn_fill(struct sk_buff *msg, struct devlink *devlink,
+ struct netlink_ext_ack *extack)
+{
+ unsigned char sn[32];
+ size_t len = 0;
+ int err;
+
+ if (!devlink->ops->serial_get)
+ return 0;
+
+ err = devlink->ops->serial_get(devlink, sn, ARRAY_SIZE(sn), &len,
+ extack);
+ if (err)
+ return err;
+
+ return nla_put(msg, DEVLINK_ATTR_INFO_SERIAL_NUMBER, len, sn);
+}
+
+static int
+devlink_nl_info_fill(struct sk_buff *msg, struct devlink *devlink,
+ enum devlink_command cmd, u32 portid,
+ u32 seq, int flags, struct netlink_ext_ack *extack)
+{
+ void *hdr;
+ int err;
+
+ hdr = genlmsg_put(msg, portid, seq, &devlink_nl_family, flags, cmd);
+ if (!hdr)
+ return -EMSGSIZE;
+
+ err = -EMSGSIZE;
+ if (devlink_nl_put_handle(msg, devlink))
+ goto err_cancel_msg;
+
+ err = devlink_nl_info_sn_fill(msg, devlink, extack);
+ if (err)
+ goto err_cancel_msg;
+
+ genlmsg_end(msg, hdr);
+ return 0;
+
+err_cancel_msg:
+ genlmsg_cancel(msg, hdr);
+ return err;
+}
+
+static int devlink_nl_cmd_info_get_doit(struct sk_buff *skb,
+ struct genl_info *info)
+{
+ struct devlink *devlink = info->user_ptr[0];
+ struct sk_buff *msg;
+ int err;
+
+ if (!devlink->ops || !devlink->ops->serial_get)
+ return -EOPNOTSUPP;
+
+ msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
+ if (!msg)
+ return -ENOMEM;
+
+ err = devlink_nl_info_fill(msg, devlink, DEVLINK_CMD_INFO_GET,
+ info->snd_portid, info->snd_seq, 0,
+ info->extack);
+ if (err) {
+ nlmsg_free(msg);
+ return err;
+ }
+
+ return genlmsg_reply(msg, info);
+}
+
+static int devlink_nl_cmd_info_get_dumpit(struct sk_buff *msg,
+ struct netlink_callback *cb)
+{
+ struct devlink *devlink;
+ int start = cb->args[0];
+ int idx = 0;
+ int err;
+
+ mutex_lock(&devlink_mutex);
+ list_for_each_entry(devlink, &devlink_list, list) {
+ if (!net_eq(devlink_net(devlink), sock_net(msg->sk)))
+ continue;
+ if (idx < start) {
+ idx++;
+ continue;
+ }
+
+ mutex_lock(&devlink->lock);
+ err = devlink_nl_info_fill(msg, devlink, DEVLINK_CMD_INFO_GET,
+ NETLINK_CB(cb->skb).portid,
+ cb->nlh->nlmsg_seq, NLM_F_MULTI,
+ cb->extack);
+ mutex_unlock(&devlink->lock);
+ if (err)
+ break;
+ idx++;
+ }
+ mutex_unlock(&devlink_mutex);
+
+ cb->args[0] = idx;
+ return msg->len;
+}
+
static const struct nla_policy devlink_nl_policy[DEVLINK_ATTR_MAX + 1] = {
[DEVLINK_ATTR_BUS_NAME] = { .type = NLA_NUL_STRING },
[DEVLINK_ATTR_DEV_NAME] = { .type = NLA_NUL_STRING },
@@ -3842,6 +3946,14 @@ static const struct genl_ops devlink_nl_ops[] = {
.flags = GENL_ADMIN_PERM,
.internal_flags = DEVLINK_NL_FLAG_NEED_DEVLINK,
},
+ {
+ .cmd = DEVLINK_CMD_INFO_GET,
+ .doit = devlink_nl_cmd_info_get_doit,
+ .dumpit = devlink_nl_cmd_info_get_dumpit,
+ .policy = devlink_nl_policy,
+ .internal_flags = DEVLINK_NL_FLAG_NEED_DEVLINK,
+ /* can be retrieved by unprivileged users */
+ },
};
static struct genl_family devlink_nl_family __ro_after_init = {
--
2.19.2
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