[Intel-wired-lan] [iproute2-next v2 2/3] mnlg: add function to get CTRL_ATTR_MAXATTR value
Jacob Keller
jacob.e.keller at intel.com
Thu Jul 21 21:14:50 UTC 2022
Add a new function to extract the CTRL_ATTR_MAXATTR attribute of the
CTRL_CMD_GETFAMILY request. This will be used to allow reading the
maximum supported devlink attribute of the running kernel in an upcoming
change.
Signed-off-by: Jacob Keller <jacob.e.keller at intel.com>
---
devlink/mnlg.c | 56 ++++++++++++++++++++++++++++++++++++++++++++++++++
devlink/mnlg.h | 1 +
2 files changed, 57 insertions(+)
diff --git a/devlink/mnlg.c b/devlink/mnlg.c
index e6d92742c150..348c3ff5c959 100644
--- a/devlink/mnlg.c
+++ b/devlink/mnlg.c
@@ -41,6 +41,10 @@ struct group_info {
const char *name;
};
+struct family_info {
+ uint32_t max_attr;
+};
+
static int parse_mc_grps_cb(const struct nlattr *attr, void *data)
{
const struct nlattr **tb = data;
@@ -149,6 +153,58 @@ int mnlg_socket_group_add(struct mnlu_gen_socket *nlg, const char *group_name)
return 0;
}
+static int get_family_attr_cb(const struct nlattr *attr, void *data)
+{
+ const struct nlattr **tb = data;
+ int type = mnl_attr_get_type(attr);
+
+ if (mnl_attr_type_valid(attr, CTRL_ATTR_MAX) < 0)
+ return MNL_CB_ERROR;
+
+ tb[type] = attr;
+ return MNL_CB_OK;
+}
+
+static int get_family_cb(const struct nlmsghdr *nlh, void *data)
+{
+ struct family_info *family = data;
+ struct nlattr *tb[CTRL_ATTR_MAX + 1] = {};
+ struct genlmsghdr *genl = mnl_nlmsg_get_payload(nlh);
+
+ mnl_attr_parse(nlh, sizeof(*genl), get_family_attr_cb, tb);
+ if (!tb[CTRL_ATTR_MAXATTR])
+ return MNL_CB_ERROR;
+
+ family->max_attr = mnl_attr_get_u32(tb[CTRL_ATTR_MAXATTR]);
+
+ return MNL_CB_OK;
+}
+
+int mnlg_socket_get_max_attr(struct mnlu_gen_socket *nlg, uint32_t *max_attr)
+{
+ struct nlmsghdr *nlh;
+ struct family_info family;
+ int err;
+
+ nlh = _mnlu_gen_socket_cmd_prepare(nlg, CTRL_CMD_GETFAMILY,
+ NLM_F_REQUEST | NLM_F_ACK,
+ GENL_ID_CTRL, 1);
+
+ mnl_attr_put_u16(nlh, CTRL_ATTR_FAMILY_ID, nlg->family);
+
+ err = mnlg_socket_send(nlg, nlh);
+ if (err < 0)
+ return err;
+
+ err = mnlu_gen_socket_recv_run(nlg, get_family_cb, &family);
+ if (err < 0)
+ return err;
+
+ *max_attr = family.max_attr;
+
+ return 0;
+}
+
int mnlg_socket_get_fd(struct mnlu_gen_socket *nlg)
{
return mnl_socket_get_fd(nlg->nl);
diff --git a/devlink/mnlg.h b/devlink/mnlg.h
index 24aa17566a9b..6348ad45ed26 100644
--- a/devlink/mnlg.h
+++ b/devlink/mnlg.h
@@ -18,6 +18,7 @@ struct mnlu_gen_socket;
int mnlg_socket_send(struct mnlu_gen_socket *nlg, const struct nlmsghdr *nlh);
int mnlg_socket_group_add(struct mnlu_gen_socket *nlg, const char *group_name);
+int mnlg_socket_get_max_attr(struct mnlu_gen_socket *nlg, uint32_t *max_attr);
int mnlg_socket_get_fd(struct mnlu_gen_socket *nlg);
#endif /* _MNLG_H_ */
--
2.36.1
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