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mac80211: make station hash table max_size configurable

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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>
This commit is contained in:
Johannes Berg 2015-04-23 17:26:06 +02:00
parent 80616c0db8
commit ebd82b39bf
2 changed files with 11 additions and 0 deletions
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10
net/mac80211/Kconfig
View File

@ -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.

1
net/mac80211/sta_info.c
View File

@ -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 */