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authorJohannes Berg <johannes.berg@intel.com>2015-04-23 18:26:06 +0300
committerJohannes Berg <johannes.berg@intel.com>2015-04-23 18:26:06 +0300
commitebd82b39bf11b38b0b50919c8d4386706b26bff7 (patch)
tree9c147b4d7aedac7bd49b6bcf5ca3d45915c2090c /net/mac80211
parent80616c0db8a26f030be78fea39f7c880c4263e55 (diff)
downloadlinux-ebd82b39bf11b38b0b50919c8d4386706b26bff7.tar.xz
mac80211: make station hash table max_size configurable
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@intel.com>
Diffstat (limited to 'net/mac80211')
-rw-r--r--net/mac80211/Kconfig10
-rw-r--r--net/mac80211/sta_info.c1
2 files changed, 11 insertions, 0 deletions
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 */