diff options
author | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-05-05 14:13:36 -0700 |
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committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-05-05 14:13:36 -0700 |
commit | 68762f3d8e7ea644fae1f490f9850ebf462548bd (patch) | |
tree | 81be52e9ba33fc4d8aa5f569aaab77b5a34e09ab /net/mac80211/ieee80211_rate.c | |
parent | 4f7a307dc6e4d8bfeb56f7cf7231b08cb845687c (diff) | |
parent | 7544b0972c1fc1a0e6c54baa1f44c81019743daa (diff) |
Merge master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6
* master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6:
[TG3]: Add TG3_FLAG_SUPPORT_MSI flag.
[TG3]: Eliminate the TG3_FLAG_5701_REG_WRITE_BUG flag.
[TG3]: Eliminate the TG3_FLAG_GOT_SERDES_FLOWCTL flag.
[TG3]: Remove reset during MAC address changes.
[TG3]: WoL fixes.
[TG3]: Clear GPIO mask before storing.
[TG3]: Improve NVRAM sizing.
[TG3]: Fix TSO bugs.
[MAC80211]: Add maintainers entry for mac80211.
[MAC80211]: Add debugfs attributes.
[MAC80211]: Add mac80211 wireless stack.
[MAC80211]: Add generic include/linux/ieee80211.h
[NETLINK]: Remove references to process ID
[AF_IUCV]: Compile fix - adopt to skbuff changes.
Diffstat (limited to 'net/mac80211/ieee80211_rate.c')
-rw-r--r-- | net/mac80211/ieee80211_rate.c | 140 |
1 files changed, 140 insertions, 0 deletions
diff --git a/net/mac80211/ieee80211_rate.c b/net/mac80211/ieee80211_rate.c new file mode 100644 index 00000000000..16e850864b8 --- /dev/null +++ b/net/mac80211/ieee80211_rate.c @@ -0,0 +1,140 @@ +/* + * Copyright 2002-2005, Instant802 Networks, Inc. + * Copyright 2005-2006, Devicescape Software, Inc. + * Copyright (c) 2006 Jiri Benc <jbenc@suse.cz> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + +#include <linux/kernel.h> +#include "ieee80211_rate.h" +#include "ieee80211_i.h" + +struct rate_control_alg { + struct list_head list; + struct rate_control_ops *ops; +}; + +static LIST_HEAD(rate_ctrl_algs); +static DEFINE_MUTEX(rate_ctrl_mutex); + +int ieee80211_rate_control_register(struct rate_control_ops *ops) +{ + struct rate_control_alg *alg; + + alg = kmalloc(sizeof(*alg), GFP_KERNEL); + if (alg == NULL) { + return -ENOMEM; + } + memset(alg, 0, sizeof(*alg)); + alg->ops = ops; + + mutex_lock(&rate_ctrl_mutex); + list_add_tail(&alg->list, &rate_ctrl_algs); + mutex_unlock(&rate_ctrl_mutex); + + return 0; +} +EXPORT_SYMBOL(ieee80211_rate_control_register); + +void ieee80211_rate_control_unregister(struct rate_control_ops *ops) +{ + struct rate_control_alg *alg; + + mutex_lock(&rate_ctrl_mutex); + list_for_each_entry(alg, &rate_ctrl_algs, list) { + if (alg->ops == ops) { + list_del(&alg->list); + break; + } + } + mutex_unlock(&rate_ctrl_mutex); + kfree(alg); +} +EXPORT_SYMBOL(ieee80211_rate_control_unregister); + +static struct rate_control_ops * +ieee80211_try_rate_control_ops_get(const char *name) +{ + struct rate_control_alg *alg; + struct rate_control_ops *ops = NULL; + + mutex_lock(&rate_ctrl_mutex); + list_for_each_entry(alg, &rate_ctrl_algs, list) { + if (!name || !strcmp(alg->ops->name, name)) + if (try_module_get(alg->ops->module)) { + ops = alg->ops; + break; + } + } + mutex_unlock(&rate_ctrl_mutex); + return ops; +} + +/* Get the rate control algorithm. If `name' is NULL, get the first + * available algorithm. */ +static struct rate_control_ops * +ieee80211_rate_control_ops_get(const char *name) +{ + struct rate_control_ops *ops; + + ops = ieee80211_try_rate_control_ops_get(name); + if (!ops) { + request_module("rc80211_%s", name ? name : "default"); + ops = ieee80211_try_rate_control_ops_get(name); + } + return ops; +} + +static void ieee80211_rate_control_ops_put(struct rate_control_ops *ops) +{ + module_put(ops->module); +} + +struct rate_control_ref *rate_control_alloc(const char *name, + struct ieee80211_local *local) +{ + struct rate_control_ref *ref; + + ref = kmalloc(sizeof(struct rate_control_ref), GFP_KERNEL); + if (!ref) + goto fail_ref; + kref_init(&ref->kref); + ref->ops = ieee80211_rate_control_ops_get(name); + if (!ref->ops) + goto fail_ops; + ref->priv = ref->ops->alloc(local); + if (!ref->priv) + goto fail_priv; + return ref; + +fail_priv: + ieee80211_rate_control_ops_put(ref->ops); +fail_ops: + kfree(ref); +fail_ref: + return NULL; +} + +static void rate_control_release(struct kref *kref) +{ + struct rate_control_ref *ctrl_ref; + + ctrl_ref = container_of(kref, struct rate_control_ref, kref); + ctrl_ref->ops->free(ctrl_ref->priv); + ieee80211_rate_control_ops_put(ctrl_ref->ops); + kfree(ctrl_ref); +} + +struct rate_control_ref *rate_control_get(struct rate_control_ref *ref) +{ + kref_get(&ref->kref); + return ref; +} + +void rate_control_put(struct rate_control_ref *ref) +{ + kref_put(&ref->kref, rate_control_release); +} |