From: Johannes Berg <johannes.berg@xxxxxxxxx>
Allow debug builds to configure the station hash table maximum
size in order to run with hash collisions in limited scenarios
such as hwsim testing. The default remains 0 which effectively
means no limit.
Signed-off-by: Johannes Berg <johannes.berg@xxxxxxxxx>
---
net/mac80211/Kconfig | 10 ++++++++++
net/mac80211/sta_info.c | 1 +
2 files changed, 11 insertions(+)
diff --git a/net/mac80211/Kconfig b/net/mac80211/Kconfig
index 64a012a0c6e5..5f698d4ec53b 100644
--- a/net/mac80211/Kconfig
+++ b/net/mac80211/Kconfig
@@ -305,3 +305,13 @@ config MAC80211_DEBUG_COUNTERS
and show them in debugfs.
If unsure, say N.
+
+config MAC80211_STA_HASH_MAX_SIZE
+ int "Station hash table maximum size" if MAC80211_DEBUG_MENU
+ default 0
+ ---help---
+ Setting this option to a low value (e.g. 4) allows testing the
+ hash table with collisions relatively deterministically (just
+ connect more stations than the number selected here.)
+
+ If unsure, leave the default of 0.
diff --git a/net/mac80211/sta_info.c b/net/mac80211/sta_info.c
index 737730abba6d..aec15d746aea 100644
--- a/net/mac80211/sta_info.c
+++ b/net/mac80211/sta_info.c
@@ -70,6 +70,7 @@ static const struct rhashtable_params sta_rht_params = {
.key_offset = offsetof(struct sta_info, sta.addr),
.key_len = ETH_ALEN,
.hashfn = sta_addr_hash,
+ .max_size = CONFIG_MAC80211_STA_HASH_MAX_SIZE,
};
/* Caller must hold local->sta_mtx */
--
2.1.4
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