LU-9680 utils: add netlink infrastructure

[fs/lustre-release.git] / lnet / include / lnet / lib-types.h

diff --git a/lnet/include/lnet/lib-types.h b/lnet/include/lnet/lib-types.h
index 87867ad..d671fb0 100644 (file)
--- a/lnet/include/lnet/lib-types.h
+++ b/lnet/include/lnet/lib-types.h
@@ -46,7 +46,9 @@
 #include <linux/semaphore.h>
 #include <linux/types.h>
 #include <linux/kref.h>
+#include <net/genetlink.h>
 
+#include <uapi/linux/lnet/lnet-nl.h>
 #include <uapi/linux/lnet/lnet-dlc.h>
 #include <uapi/linux/lnet/lnetctl.h>
 #include <uapi/linux/lnet/nidstr.h>
@@ -1254,4 +1256,44 @@ struct lnet {
        struct list_head                ln_udsp_list;
 };
 
+static const struct nla_policy scalar_attr_policy[LN_SCALAR_CNT + 1] = {
+       [LN_SCALAR_ATTR_LIST]           = { .type = NLA_NESTED },
+       [LN_SCALAR_ATTR_LIST_SIZE]      = { .type = NLA_U16 },
+       [LN_SCALAR_ATTR_INDEX]          = { .type = NLA_U16 },
+       [LN_SCALAR_ATTR_NLA_TYPE]       = { .type = NLA_U16 },
+       [LN_SCALAR_ATTR_VALUE]          = { .type = NLA_STRING },
+       [LN_SCALAR_ATTR_KEY_FORMAT]     = { .type = NLA_U16 },
+};
+
+int lnet_genl_send_scalar_list(struct sk_buff *msg, u32 portid, u32 seq,
+                              const struct genl_family *family, int flags,
+                              u8 cmd, const struct ln_key_list *data[]);
+
+/* Special workaround for pre-4.19 kernels to send error messages
+ * from dumpit routines. Newer kernels will send message with
+ * NL_SET_ERR_MSG information by default if NETLINK_EXT_ACK is set.
+ */
+static inline int lnet_nl_send_error(struct sk_buff *msg, int portid, int seq,
+                                    int error)
+{
+#ifndef HAVE_NL_DUMP_WITH_EXT_ACK
+       struct nlmsghdr *nlh;
+
+       if (!error)
+               return 0;
+
+       nlh = nlmsg_put(msg, portid, seq, NLMSG_ERROR, sizeof(error), 0);
+       if (!nlh)
+               return -ENOMEM;
+#ifdef HAVE_NL_PARSE_WITH_EXT_ACK
+       netlink_ack(msg, nlh, error, NULL);
+#else
+       netlink_ack(msg, nlh, error);
+#endif
+       return nlmsg_len(nlh);
+#else
+       return error;
+#endif
+}
+
 #endif