+static int ipath_supports_subports(int user_swmajor, int user_swminor)
+{
+ /* no subport implementation prior to software version 1.3 */
+ return (user_swmajor > 1) || (user_swminor >= 3);
+}
+
+static int ipath_compatible_subports(int user_swmajor, int user_swminor)
+{
+ /* this code is written long-hand for clarity */
+ if (IPATH_USER_SWMAJOR != user_swmajor) {
+ /* no promise of compatibility if major mismatch */
+ return 0;
+ }
+ if (IPATH_USER_SWMAJOR == 1) {
+ switch (IPATH_USER_SWMINOR) {
+ case 0:
+ case 1:
+ case 2:
+ /* no subport implementation so cannot be compatible */
+ return 0;
+ case 3:
+ /* 3 is only compatible with itself */
+ return user_swminor == 3;
+ default:
+ /* >= 4 are compatible (or are expected to be) */
+ return user_swminor >= 4;
+ }
+ }
+ /* make no promises yet for future major versions */
+ return 0;
+}
+