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authorLinus Lüssing <linus.luessing@c0d3.blue>2020-06-01 23:35:22 +0300
committerSimon Wunderlich <sw@simonwunderlich.de>2020-06-26 11:37:11 +0300
commit3bda14d09dc5789a895ab02b7dcfcec19b0a65b3 (patch)
tree2f10916db38855a459d381cfc00c0eeecb0ada66 /net/batman-adv/bat_iv_ogm.c
parentbccb48c89fe3c09f1cbb7c8612e31f5daa1d4541 (diff)
downloadlinux-3bda14d09dc5789a895ab02b7dcfcec19b0a65b3.tar.xz
batman-adv: Introduce a configurable per interface hop penalty
In some setups multiple hard interfaces with similar link qualities or throughput values are available. But people have expressed the desire to consider one of them as a backup only. Some creative solutions are currently in use: Such people are configuring multiple batman-adv mesh/soft interfaces, wire them together with some veth pairs and then tune the hop penalty to achieve an effect similar to a tunable per interface hop penalty. This patch introduces a new, configurable, per hard interface hop penalty to simplify such setups. Signed-off-by: Linus Lüssing <linus.luessing@c0d3.blue> Signed-off-by: Sven Eckelmann <sven@narfation.org> Signed-off-by: Simon Wunderlich <sw@simonwunderlich.de>
Diffstat (limited to 'net/batman-adv/bat_iv_ogm.c')
-rw-r--r--net/batman-adv/bat_iv_ogm.c17
1 files changed, 9 insertions, 8 deletions
diff --git a/net/batman-adv/bat_iv_ogm.c b/net/batman-adv/bat_iv_ogm.c
index 5b3a41983156..a4faf5f904d9 100644
--- a/net/batman-adv/bat_iv_ogm.c
+++ b/net/batman-adv/bat_iv_ogm.c
@@ -1075,10 +1075,10 @@ static bool batadv_iv_ogm_calc_tq(struct batadv_orig_node *orig_node,
struct batadv_neigh_ifinfo *neigh_ifinfo;
u8 total_count;
u8 orig_eq_count, neigh_rq_count, neigh_rq_inv, tq_own;
+ unsigned int tq_iface_hop_penalty = BATADV_TQ_MAX_VALUE;
unsigned int neigh_rq_inv_cube, neigh_rq_max_cube;
unsigned int tq_asym_penalty, inv_asym_penalty;
unsigned int combined_tq;
- unsigned int tq_iface_penalty;
bool ret = false;
/* find corresponding one hop neighbor */
@@ -1157,31 +1157,32 @@ static bool batadv_iv_ogm_calc_tq(struct batadv_orig_node *orig_node,
inv_asym_penalty = BATADV_TQ_MAX_VALUE * neigh_rq_inv_cube;
inv_asym_penalty /= neigh_rq_max_cube;
tq_asym_penalty = BATADV_TQ_MAX_VALUE - inv_asym_penalty;
+ tq_iface_hop_penalty -= atomic_read(&if_incoming->hop_penalty);
/* penalize if the OGM is forwarded on the same interface. WiFi
* interfaces and other half duplex devices suffer from throughput
* drops as they can't send and receive at the same time.
*/
- tq_iface_penalty = BATADV_TQ_MAX_VALUE;
if (if_outgoing && if_incoming == if_outgoing &&
batadv_is_wifi_hardif(if_outgoing))
- tq_iface_penalty = batadv_hop_penalty(BATADV_TQ_MAX_VALUE,
- bat_priv);
+ tq_iface_hop_penalty = batadv_hop_penalty(tq_iface_hop_penalty,
+ bat_priv);
combined_tq = batadv_ogm_packet->tq *
tq_own *
tq_asym_penalty *
- tq_iface_penalty;
+ tq_iface_hop_penalty;
combined_tq /= BATADV_TQ_MAX_VALUE *
BATADV_TQ_MAX_VALUE *
BATADV_TQ_MAX_VALUE;
batadv_ogm_packet->tq = combined_tq;
batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
- "bidirectional: orig = %pM neigh = %pM => own_bcast = %2i, real recv = %2i, local tq: %3i, asym_penalty: %3i, iface_penalty: %3i, total tq: %3i, if_incoming = %s, if_outgoing = %s\n",
+ "bidirectional: orig = %pM neigh = %pM => own_bcast = %2i, real recv = %2i, local tq: %3i, asym_penalty: %3i, iface_hop_penalty: %3i, total tq: %3i, if_incoming = %s, if_outgoing = %s\n",
orig_node->orig, orig_neigh_node->orig, total_count,
- neigh_rq_count, tq_own, tq_asym_penalty, tq_iface_penalty,
- batadv_ogm_packet->tq, if_incoming->net_dev->name,
+ neigh_rq_count, tq_own, tq_asym_penalty,
+ tq_iface_hop_penalty, batadv_ogm_packet->tq,
+ if_incoming->net_dev->name,
if_outgoing ? if_outgoing->net_dev->name : "DEFAULT");
/* if link has the minimum required transmission quality