Repository : ssh://git@open-mesh.org/batman-adv
On branch : master
commit b7232de7e6638f500fadc9908cf6f35f9a6aa561 Author: Markus Pargmann mpa@pengutronix.de Date: Sun Jul 3 11:07:14 2016 +0200
batman-adv: iv_ogm, Reduce code duplication
The difference between tq1 and tq2 are calculated the same way in two separate functions.
This patch moves the common code to a seperate function 'batadv_iv_ogm_neigh_diff' which handles everything necessary. The other two functions can then handle errors and use the difference directly.
Signed-off-by: Markus Pargmann mpa@pengutronix.de [sven@narfation.org: rebased on current version, initialize return variable in batadv_iv_ogm_neigh_diff, add kerneldoc, convert to bool return type] Signed-off-by: Sven Eckelmann sven@narfation.org Signed-off-by: Marek Lindner mareklindner@neomailbox.ch
b7232de7e6638f500fadc9908cf6f35f9a6aa561 net/batman-adv/bat_iv_ogm.c | 77 +++++++++++++++++++++++++++------------------ 1 file changed, 47 insertions(+), 30 deletions(-)
diff --git a/net/batman-adv/bat_iv_ogm.c b/net/batman-adv/bat_iv_ogm.c index d04874f..57e0af9 100644 --- a/net/batman-adv/bat_iv_ogm.c +++ b/net/batman-adv/bat_iv_ogm.c @@ -2019,35 +2019,40 @@ static void batadv_iv_neigh_print(struct batadv_priv *bat_priv, }
/** - * batadv_iv_ogm_neigh_cmp - compare the metrics of two neighbors + * batadv_iv_ogm_neigh_diff - calculate tq difference of two neighbors * @neigh1: the first neighbor object of the comparison * @if_outgoing1: outgoing interface for the first neighbor * @neigh2: the second neighbor object of the comparison * @if_outgoing2: outgoing interface for the second neighbor + * @diff: pointer to integer receiving the calculated difference * - * Return: a value less, equal to or greater than 0 if the metric via neigh1 is - * lower, the same as or higher than the metric via neigh2 + * The content of *@diff is only valid when this function returns true. + * It is less, equal to or greater than 0 if the metric via neigh1 is lower, + * the same as or higher than the metric via neigh2 + * + * Return: true when the difference could be calculated, false otherwise */ -static int batadv_iv_ogm_neigh_cmp(struct batadv_neigh_node *neigh1, - struct batadv_hard_iface *if_outgoing1, - struct batadv_neigh_node *neigh2, - struct batadv_hard_iface *if_outgoing2) +static bool batadv_iv_ogm_neigh_diff(struct batadv_neigh_node *neigh1, + struct batadv_hard_iface *if_outgoing1, + struct batadv_neigh_node *neigh2, + struct batadv_hard_iface *if_outgoing2, + int *diff) { struct batadv_neigh_ifinfo *neigh1_ifinfo, *neigh2_ifinfo; u8 tq1, tq2; - int diff; + bool ret = true;
neigh1_ifinfo = batadv_neigh_ifinfo_get(neigh1, if_outgoing1); neigh2_ifinfo = batadv_neigh_ifinfo_get(neigh2, if_outgoing2);
if (!neigh1_ifinfo || !neigh2_ifinfo) { - diff = 0; + ret = false; goto out; }
tq1 = neigh1_ifinfo->bat_iv.tq_avg; tq2 = neigh2_ifinfo->bat_iv.tq_avg; - diff = tq1 - tq2; + *diff = (int)tq1 - (int)tq2;
out: if (neigh1_ifinfo) @@ -2055,6 +2060,32 @@ out: if (neigh2_ifinfo) batadv_neigh_ifinfo_put(neigh2_ifinfo);
+ return ret; +} + +/** + * batadv_iv_ogm_neigh_cmp - compare the metrics of two neighbors + * @neigh1: the first neighbor object of the comparison + * @if_outgoing1: outgoing interface for the first neighbor + * @neigh2: the second neighbor object of the comparison + * @if_outgoing2: outgoing interface for the second neighbor + * + * Return: a value less, equal to or greater than 0 if the metric via neigh1 is + * lower, the same as or higher than the metric via neigh2 + */ +static int batadv_iv_ogm_neigh_cmp(struct batadv_neigh_node *neigh1, + struct batadv_hard_iface *if_outgoing1, + struct batadv_neigh_node *neigh2, + struct batadv_hard_iface *if_outgoing2) +{ + bool ret; + int diff; + + ret = batadv_iv_ogm_neigh_diff(neigh1, if_outgoing1, neigh2, + if_outgoing2, &diff); + if (!ret) + return 0; + return diff; }
@@ -2075,29 +2106,15 @@ batadv_iv_ogm_neigh_is_sob(struct batadv_neigh_node *neigh1, struct batadv_neigh_node *neigh2, struct batadv_hard_iface *if_outgoing2) { - struct batadv_neigh_ifinfo *neigh1_ifinfo, *neigh2_ifinfo; - u8 tq1, tq2; bool ret; + int diff;
- neigh1_ifinfo = batadv_neigh_ifinfo_get(neigh1, if_outgoing1); - neigh2_ifinfo = batadv_neigh_ifinfo_get(neigh2, if_outgoing2); - - /* we can't say that the metric is better */ - if (!neigh1_ifinfo || !neigh2_ifinfo) { - ret = false; - goto out; - } - - tq1 = neigh1_ifinfo->bat_iv.tq_avg; - tq2 = neigh2_ifinfo->bat_iv.tq_avg; - ret = (tq1 - tq2) > -BATADV_TQ_SIMILARITY_THRESHOLD; - -out: - if (neigh1_ifinfo) - batadv_neigh_ifinfo_put(neigh1_ifinfo); - if (neigh2_ifinfo) - batadv_neigh_ifinfo_put(neigh2_ifinfo); + ret = batadv_iv_ogm_neigh_diff(neigh1, if_outgoing1, neigh2, + if_outgoing2, &diff); + if (!ret) + return false;
+ ret = diff > -BATADV_TQ_SIMILARITY_THRESHOLD; return ret; }