/*

 * Copyright (c) 2005 Christophe Varoqui

 * Copyright (c) 2005 Edward Goggin, EMC

 */

#include "checkers.h"

#include "vector.h"

#include "structs.h"

#include "switchgroup.h"

void path_group_prio_update(struct pathgroup *pgp)

{

	int i;

	int priority = 0;

	int marginal = 0;

	struct path * pp;

	pgp->enabled_paths = 0;

	if (!pgp->paths) {

		pgp->priority = 0;

		return;

	}

	vector_foreach_slot (pgp->paths, pp, i) {

		if (pp->marginal)

			marginal++;

		if (pp->state == PATH_UP ||

		    pp->state == PATH_GHOST) {

			priority += pp->priority;

			pgp->enabled_paths++;

		}

	}

	if (pgp->enabled_paths)

		pgp->priority = priority / pgp->enabled_paths;

	else

		pgp->priority = 0;

	if (marginal && marginal == i)

		pgp->marginal = 1;

}

int select_path_group(struct multipath *mpp)

{

	int i;

	int normal_pgp = 0;

	int max_priority = 0;

	int bestpg = 1;

	int max_enabled_paths = 1;

	struct pathgroup * pgp;

	if (!mpp->pg)

		return 1;

	vector_foreach_slot (mpp->pg, pgp, i) {

		if (!pgp->paths)

			continue;

		path_group_prio_update(pgp);

		if (pgp->marginal && normal_pgp)

			continue;

		if (pgp->enabled_paths) {

			if (!pgp->marginal && !normal_pgp) {

				normal_pgp = 1;

				max_priority = pgp->priority;

				max_enabled_paths = pgp->enabled_paths;

				bestpg = i + 1;

			} else if (pgp->priority > max_priority) {

				max_priority = pgp->priority;

				max_enabled_paths = pgp->enabled_paths;

				bestpg = i + 1;

			} else if (pgp->priority == max_priority) {

				if (pgp->enabled_paths > max_enabled_paths) {

					max_enabled_paths = pgp->enabled_paths;

					bestpg = i + 1;

				}

			}

		}

	}

	return bestpg;

}