[PATCH] libertas: Create sysfs entry for changing the mesh probe response limit

[Javier Cardona]

Dan,

On Wed, Dec 10, 2008 at 11:44 AM, Anna Neal <anna at cozybit.com> wrote:
> On Wed, Dec 10, 2008 at 9:03 AM, Dan Williams <dcbw at redhat.com> wrote:
>> On Tue, 2008-12-09 at 13:23 -0800, Anna Neal wrote:
>>> This patch adds the ability to change the number of probe response retries sent
>>> by the mesh interface.
>>>
>>> In dense networks it is recommended to change this value to zero to reduce
>>> traffic congestion.
>>
>> Does this sort of thing also apply to the mesh functionality in
>> mac80211?  Just trying to figure out if this is usb8388 mesh specific,
>> or general functionality.
>
> >From my understanding, this is specific to the usb8388 mesh. The mac80211
> mesh parameters are different and do not deal with probe responses
> directly.  The
> mac80211 parameters can be found here:
> http://o11s.org/trac/wiki/HOWTO#AdvancedTinkering

The parameter that the patch exposes to userspace controls how many
retries to use on probe responses when the mesh is enabled.  This
should not affect probe responses in ad-hoc mode.

The 11s draft does not introduce specific provisions for probe
responses issued by mesh points.  Therefore all probe responses,
regardless the STA's operating mode, should be transmitted with
dot11ShortRetryLimit retries.  Given it is o11s' goal to track the
standard,  we don't intend to implement anything similar to
prb_rsp_limit for mac80211.

Cheers,

Javier


>>> Signed-off-by: Anna Neal <anna at cozybit.com>
>>> Signed-off-by: Andrey Yurovsky <andrey at cozybit.com>
>>> ---
>>>  drivers/net/wireless/libertas/host.h |    1 +
>>>  drivers/net/wireless/libertas/main.c |   60 ++++++++++++++++++++++++++++++++++
>>>  2 files changed, 61 insertions(+), 0 deletions(-)
>>>
>>> diff --git a/drivers/net/wireless/libertas/host.h b/drivers/net/wireless/libertas/host.h
>>> index a17b778..277ff19 100644
>>> --- a/drivers/net/wireless/libertas/host.h
>>> +++ b/drivers/net/wireless/libertas/host.h
>>> @@ -245,6 +245,7 @@ enum cmd_mesh_access_opts {
>>>       CMD_ACT_MESH_GET_ROUTE_EXP,
>>>       CMD_ACT_MESH_SET_AUTOSTART_ENABLED,
>>>       CMD_ACT_MESH_GET_AUTOSTART_ENABLED,
>>> +     CMD_ACT_MESH_SET_GET_PRB_RSP_LIMIT = 17,
>>>  };
>>>
>>>  /* Define actions and types for CMD_MESH_CONFIG */
>>> diff --git a/drivers/net/wireless/libertas/main.c b/drivers/net/wireless/libertas/main.c
>>> index c320264..f7caef9 100644
>>> --- a/drivers/net/wireless/libertas/main.c
>>> +++ b/drivers/net/wireless/libertas/main.c
>>> @@ -257,6 +257,58 @@ static ssize_t lbs_anycast_set(struct device *dev,
>>>       return strlen(buf);
>>>  }
>>>
>>> +/**
>>> + * @brief Get function for sysfs attribute prb_rsp_limit
>>> + */
>>> +static ssize_t lbs_prb_rsp_limit_get(struct device *dev,
>>> +             struct device_attribute *attr, char *buf)
>>> +{
>>> +     struct lbs_private *priv = to_net_dev(dev)->priv;
>>> +     struct cmd_ds_mesh_access mesh_access;
>>> +     int ret;
>>> +     u32 retry_limit;
>>> +
>>> +     memset(&mesh_access, 0, sizeof(mesh_access));
>>> +     mesh_access.data[0] = cpu_to_le32(CMD_ACT_GET);
>>> +
>>> +     ret = lbs_mesh_access(priv, CMD_ACT_MESH_SET_GET_PRB_RSP_LIMIT,
>>> +                     &mesh_access);
>>> +     if (ret)
>>> +             return ret;
>>> +
>>> +     retry_limit = le32_to_cpu(mesh_access.data[1]);
>>> +     return snprintf(buf, 10, "%d\n", retry_limit);
>>> +}
>>> +
>>> +/**
>>> + * @brief Set function for sysfs attribute prb_rsp_limit
>>> + */
>>> +static ssize_t lbs_prb_rsp_limit_set(struct device *dev,
>>> +             struct device_attribute *attr, const char *buf, size_t count)
>>> +{
>>> +     struct lbs_private *priv = to_net_dev(dev)->priv;
>>> +     struct cmd_ds_mesh_access mesh_access;
>>> +     int ret;
>>> +     unsigned long retry_limit;
>>> +
>>> +     memset(&mesh_access, 0, sizeof(mesh_access));
>>> +     mesh_access.data[0] = cpu_to_le32(CMD_ACT_SET);
>>> +
>>> +     if (!strict_strtoul(buf, 10, &retry_limit))
>>> +             return -ENOTSUPP;
>>> +     if (retry_limit > 15)
>>> +             return -ENOTSUPP;
>>> +
>>> +     mesh_access.data[1] = cpu_to_le32(retry_limit);
>>> +
>>> +     ret = lbs_mesh_access(priv, CMD_ACT_MESH_SET_GET_PRB_RSP_LIMIT,
>>> +                     &mesh_access);
>>> +     if (ret)
>>> +             return ret;
>>> +
>>> +     return strlen(buf);
>>> +}
>>> +
>>>  static int lbs_add_rtap(struct lbs_private *priv);
>>>  static void lbs_remove_rtap(struct lbs_private *priv);
>>>  static int lbs_add_mesh(struct lbs_private *priv);
>>> @@ -375,8 +427,16 @@ static DEVICE_ATTR(lbs_mesh, 0644, lbs_mesh_get, lbs_mesh_set);
>>>   */
>>>  static DEVICE_ATTR(anycast_mask, 0644, lbs_anycast_get, lbs_anycast_set);
>>>
>>> +/**
>>> + * prb_rsp_limit attribute to be exported per mshX interface
>>> + * through sysfs (/sys/class/net/mshX/prb_rsp_limit)
>>> + */
>>> +static DEVICE_ATTR(prb_rsp_limit, 0644, lbs_prb_rsp_limit_get,
>>> +             lbs_prb_rsp_limit_set);
>>> +
>>>  static struct attribute *lbs_mesh_sysfs_entries[] = {
>>>       &dev_attr_anycast_mask.attr,
>>> +     &dev_attr_prb_rsp_limit.attr,
>>>       NULL,
>>>  };
>>>
>>
>>
>
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>



-- 
Javier Cardona
cozybit Inc.