batman-adv: Replace gw_reselect divisor with simple shift
The gw_factor is divided by BATADV_TQ_LOCAL_WINDOW_SIZE ** 2 * 64. But the rest of the calculation has nothing to do with the tq window size and therefore the calculation is just (tmp_gw_factor / (64 ** 3)). Replace it with a simple shift to avoid a costly 64-bit divide when the max_gw_factor is changed from u32 to u64. This type change is necessary to avoid an overflow bug. Signed-off-by: Sven Eckelmann <sven@narfation.org> Signed-off-by: Marek Lindner <mareklindner@neomailbox.ch> Signed-off-by: Antonio Quartulli <antonio@meshcoding.com>
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@ -154,14 +154,10 @@ batadv_gw_get_best_gw_node(struct batadv_priv *bat_priv)
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struct batadv_neigh_ifinfo *router_ifinfo;
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struct batadv_gw_node *gw_node, *curr_gw = NULL;
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uint32_t max_gw_factor = 0, tmp_gw_factor = 0;
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uint32_t gw_divisor;
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uint8_t max_tq = 0;
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uint8_t tq_avg;
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struct batadv_orig_node *orig_node;
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gw_divisor = BATADV_TQ_LOCAL_WINDOW_SIZE * BATADV_TQ_LOCAL_WINDOW_SIZE;
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gw_divisor *= 64;
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rcu_read_lock();
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hlist_for_each_entry_rcu(gw_node, &bat_priv->gw.list, list) {
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if (gw_node->deleted)
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@ -187,7 +183,7 @@ batadv_gw_get_best_gw_node(struct batadv_priv *bat_priv)
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tmp_gw_factor = tq_avg * tq_avg;
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tmp_gw_factor *= gw_node->bandwidth_down;
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tmp_gw_factor *= 100 * 100;
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tmp_gw_factor /= gw_divisor;
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tmp_gw_factor >>= 18;
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if ((tmp_gw_factor > max_gw_factor) ||
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((tmp_gw_factor == max_gw_factor) &&
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