LU-9480 lnet: add sanity checks on ping-related constants

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

diff --git a/lnet/include/uapi/linux/lnet/lnet-types.h b/lnet/include/uapi/linux/lnet/lnet-types.h
index 520f8ff..a80cc73 100644 (file)
--- a/lnet/include/uapi/linux/lnet/lnet-types.h
+++ b/lnet/include/uapi/linux/lnet/lnet-types.h
@@ -241,6 +241,50 @@ typedef struct lnet_counters {
 #define LNET_NI_STATUS_DOWN    0xdeadface
 #define LNET_NI_STATUS_INVALID 0x00000000
 
+struct lnet_ni_status {
+       lnet_nid_t ns_nid;
+       __u32      ns_status;
+       __u32      ns_unused;
+} WIRE_ATTR;
+
+/*
+ * NB: value of these features equal to LNET_PROTO_PING_VERSION_x
+ * of old LNet, so there shouldn't be any compatibility issue
+ */
+#define LNET_PING_FEAT_INVAL           (0)             /* no feature */
+#define LNET_PING_FEAT_BASE            (1 << 0)        /* just a ping */
+#define LNET_PING_FEAT_NI_STATUS       (1 << 1)        /* return NI status */
+#define LNET_PING_FEAT_RTE_DISABLED    (1 << 2)        /* Routing enabled */
+#define LNET_PING_FEAT_MULTI_RAIL      (1 << 3)        /* Multi-Rail aware */
+#define LNET_PING_FEAT_DISCOVERY       (1 << 4)        /* Supports Discovery */
+
+/*
+ * All ping feature bits fit to hit the wire.
+ * In lnet_assert_wire_constants() this is compared against its open-coded
+ * value, and in lnet_ping_target_update() it is used to verify that no
+ * unknown bits have been set.
+ * New feature bits can be added, just be aware that this does change the
+ * over-the-wire protocol.
+ */
+#define LNET_PING_FEAT_BITS            (LNET_PING_FEAT_BASE | \
+                                        LNET_PING_FEAT_NI_STATUS | \
+                                        LNET_PING_FEAT_RTE_DISABLED | \
+                                        LNET_PING_FEAT_MULTI_RAIL | \
+                                        LNET_PING_FEAT_DISCOVERY)
+
+struct lnet_ping_info {
+       __u32                   pi_magic;
+       __u32                   pi_features;
+       lnet_pid_t              pi_pid;
+       __u32                   pi_nnis;
+       struct lnet_ni_status   pi_ni[0];
+} WIRE_ATTR;
+
+#define LNET_PING_INFO_SIZE(NNIDS) \
+       offsetof(struct lnet_ping_info, pi_ni[NNIDS])
+#define LNET_PING_INFO_LONI(PINFO)     ((PINFO)->pi_ni[0].ns_nid)
+#define LNET_PING_INFO_SEQNO(PINFO)    ((PINFO)->pi_ni[0].ns_status)
+
 /*
  * This is a hard-coded limit on the number of interfaces supported by
  * the interface bonding implemented by the ksocknal LND. It must be