On Tue, 2012-02-28 at 17:04 -0800, Ashok Nagarajan wrote:
> Mesh peer links are established only if average rssi of the peer
> candidate satisfies the threshold. This is not in 802.11s specification
> but was requested by David Fulgham, an open80211s user. This is a way to avoid
> marginal peer links with stations that are barely within range.
>
> This patch adds a new mesh configuration parameter, mesh_rssi_threshold. This
> feature is supported only for hardwares that report signal in dBm.
>
> Signed-off-by: Ashok Nagarajan <ashok@xxxxxxxxxxx>
> Signed-off-by: Javier Cardona <javier@xxxxxxxxxxx>
> ---
> v3:
> use s32 instead of int32_t (Kalle Valo)
> Feature to be supported for devices reporting signal in dBm (Johannes)
Looks good, thanks.
> include/linux/nl80211.h | 5 +++++
> include/net/cfg80211.h | 1 +
> net/mac80211/cfg.c | 8 ++++++++
> net/mac80211/debugfs_netdev.c | 2 ++
> net/mac80211/mesh_plink.c | 16 +++++++++++++++-
> net/wireless/mesh.c | 3 +++
> net/wireless/nl80211.c | 5 +++++
> 7 files changed, 39 insertions(+), 1 deletions(-)
>
> diff --git a/include/linux/nl80211.h b/include/linux/nl80211.h
> index be35a68..38fda5e 100644
> --- a/include/linux/nl80211.h
> +++ b/include/linux/nl80211.h
> @@ -2112,6 +2112,10 @@ enum nl80211_mntr_flags {
> * @NL80211_MESHCONF_FORWARDING: set Mesh STA as forwarding or non-forwarding
> * or forwarding entity (default is TRUE - forwarding entity)
> *
> + * @NL80211_MESHCONF_RSSI_THRESHOLD: RSSI threshold in dBm. This specifies the
> + * threshold for average signal strength of candidate station to establish
> + * a peer link.
> + *
> * @NL80211_MESHCONF_ATTR_MAX: highest possible mesh configuration attribute
> *
> * @__NL80211_MESHCONF_ATTR_AFTER_LAST: internal use
> @@ -2137,6 +2141,7 @@ enum nl80211_meshconf_params {
> NL80211_MESHCONF_GATE_ANNOUNCEMENTS,
> NL80211_MESHCONF_HWMP_PERR_MIN_INTERVAL,
> NL80211_MESHCONF_FORWARDING,
> + NL80211_MESHCONF_RSSI_THRESHOLD,
>
> /* keep last */
> __NL80211_MESHCONF_ATTR_AFTER_LAST,
> diff --git a/include/net/cfg80211.h b/include/net/cfg80211.h
> index 755a770..4866a10 100644
> --- a/include/net/cfg80211.h
> +++ b/include/net/cfg80211.h
> @@ -809,6 +809,7 @@ struct mesh_config {
> * Still keeping the same nomenclature to be in sync with the spec. */
> bool dot11MeshGateAnnouncementProtocol;
> bool dot11MeshForwarding;
> + s32 rssi_threshold;
> };
>
> /**
> diff --git a/net/mac80211/cfg.c b/net/mac80211/cfg.c
> index f7eb25a..ef9bbb8 100644
> --- a/net/mac80211/cfg.c
> +++ b/net/mac80211/cfg.c
> @@ -1314,6 +1314,14 @@ static int ieee80211_update_mesh_config(struct wiphy *wiphy,
> }
> if (_chg_mesh_attr(NL80211_MESHCONF_FORWARDING, mask))
> conf->dot11MeshForwarding = nconf->dot11MeshForwarding;
> + if (_chg_mesh_attr(NL80211_MESHCONF_RSSI_THRESHOLD, mask)) {
> + /* our RSSI threshold implementation is supported only for
> + * devices that report signal in dBm.
> + */
> + if (!(sdata->local->hw.flags & IEEE80211_HW_SIGNAL_DBM))
> + return -ENOTSUPP;
> + conf->rssi_threshold = nconf->rssi_threshold;
> + }
> return 0;
> }
>
> diff --git a/net/mac80211/debugfs_netdev.c b/net/mac80211/debugfs_netdev.c
> index 510ed1d..9f484d8 100644
> --- a/net/mac80211/debugfs_netdev.c
> +++ b/net/mac80211/debugfs_netdev.c
> @@ -443,6 +443,7 @@ IEEE80211_IF_FILE(dot11MeshGateAnnouncementProtocol,
> IEEE80211_IF_FILE(dot11MeshHWMPRannInterval,
> u.mesh.mshcfg.dot11MeshHWMPRannInterval, DEC);
> IEEE80211_IF_FILE(dot11MeshForwarding, u.mesh.mshcfg.dot11MeshForwarding, DEC);
> +IEEE80211_IF_FILE(rssi_threshold, u.mesh.mshcfg.rssi_threshold, DEC);
> #endif
>
>
> @@ -581,6 +582,7 @@ static void add_mesh_config(struct ieee80211_sub_if_data *sdata)
> MESHPARAMS_ADD(dot11MeshHWMPRootMode);
> MESHPARAMS_ADD(dot11MeshHWMPRannInterval);
> MESHPARAMS_ADD(dot11MeshGateAnnouncementProtocol);
> + MESHPARAMS_ADD(rssi_threshold);
> #undef MESHPARAMS_ADD
> }
> #endif
> diff --git a/net/mac80211/mesh_plink.c b/net/mac80211/mesh_plink.c
> index 8806e5e..80ce527 100644
> --- a/net/mac80211/mesh_plink.c
> +++ b/net/mac80211/mesh_plink.c
> @@ -31,6 +31,11 @@
> #define dot11MeshHoldingTimeout(s) (s->u.mesh.mshcfg.dot11MeshHoldingTimeout)
> #define dot11MeshMaxPeerLinks(s) (s->u.mesh.mshcfg.dot11MeshMaxPeerLinks)
>
> +#define sta_meets_rssi_threshold(sta, sdata) \
> + (sdata->u.mesh.mshcfg.rssi_threshold == 0 ||\
> + (s8) -ewma_read(&sta->avg_signal) > \
> + sdata->u.mesh.mshcfg.rssi_threshold)
> +
> enum plink_event {
> PLINK_UNDEFINED,
> OPN_ACPT,
> @@ -301,7 +306,8 @@ void mesh_neighbour_update(u8 *hw_addr, u32 rates,
> if (mesh_peer_accepts_plinks(elems) &&
> sta->plink_state == NL80211_PLINK_LISTEN &&
> sdata->u.mesh.accepting_plinks &&
> - sdata->u.mesh.mshcfg.auto_open_plinks)
> + sdata->u.mesh.mshcfg.auto_open_plinks &&
> + sta_meets_rssi_threshold(sta, sdata))
> mesh_plink_open(sta);
>
> rcu_read_unlock();
> @@ -531,6 +537,14 @@ void mesh_rx_plink_frame(struct ieee80211_sub_if_data *sdata, struct ieee80211_m
> return;
> }
>
> + if (ftype == WLAN_SP_MESH_PEERING_OPEN &&
> + !sta_meets_rssi_threshold(sta, sdata)) {
> + mpl_dbg("Mesh plink: %pM does not meet rssi threshold\n",
> + sta->sta.addr);
> + rcu_read_unlock();
> + return;
> + }
> +
> if (sta && !test_sta_flag(sta, WLAN_STA_AUTH)) {
> mpl_dbg("Mesh plink: Action frame from non-authed peer\n");
> rcu_read_unlock();
> diff --git a/net/wireless/mesh.c b/net/wireless/mesh.c
> index 9d3e3b6..ba21ab2 100644
> --- a/net/wireless/mesh.c
> +++ b/net/wireless/mesh.c
> @@ -23,6 +23,8 @@
> #define MESH_PERR_MIN_INT 100
> #define MESH_DIAM_TRAVERSAL_TIME 50
>
> +#define MESH_RSSI_THRESHOLD 0
> +
> /*
> * A path will be refreshed if it is used PATH_REFRESH_TIME milliseconds
> * before timing out. This way it will remain ACTIVE and no data frames
> @@ -56,6 +58,7 @@ const struct mesh_config default_mesh_config = {
> .dot11MeshHWMPRannInterval = MESH_RANN_INTERVAL,
> .dot11MeshGateAnnouncementProtocol = false,
> .dot11MeshForwarding = true,
> + .rssi_threshold = MESH_RSSI_THRESHOLD,
> };
>
> const struct mesh_setup default_mesh_setup = {
> diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c
> index 1998c36..25a470a 100644
> --- a/net/wireless/nl80211.c
> +++ b/net/wireless/nl80211.c
> @@ -3290,6 +3290,8 @@ static int nl80211_get_mesh_config(struct sk_buff *skb,
> cur_params.dot11MeshGateAnnouncementProtocol);
> NLA_PUT_U8(msg, NL80211_MESHCONF_FORWARDING,
> cur_params.dot11MeshForwarding);
> + NLA_PUT_U32(msg, NL80211_MESHCONF_RSSI_THRESHOLD,
> + cur_params.rssi_threshold);
> nla_nest_end(msg, pinfoattr);
> genlmsg_end(msg, hdr);
> return genlmsg_reply(msg, info);
> @@ -3322,6 +3324,7 @@ static const struct nla_policy nl80211_meshconf_params_policy[NL80211_MESHCONF_A
> [NL80211_MESHCONF_HWMP_RANN_INTERVAL] = { .type = NLA_U16 },
> [NL80211_MESHCONF_GATE_ANNOUNCEMENTS] = { .type = NLA_U8 },
> [NL80211_MESHCONF_FORWARDING] = { .type = NLA_U8 },
> + [NL80211_MESHCONF_RSSI_THRESHOLD] = { .type = NLA_U32},
> };
>
> static const struct nla_policy
> @@ -3413,6 +3416,8 @@ do {\
> nla_get_u8);
> FILL_IN_MESH_PARAM_IF_SET(tb, cfg, dot11MeshForwarding,
> mask, NL80211_MESHCONF_FORWARDING, nla_get_u8);
> + FILL_IN_MESH_PARAM_IF_SET(tb, cfg, rssi_threshold,
> + mask, NL80211_MESHCONF_RSSI_THRESHOLD, nla_get_u32);
> if (mask_out)
> *mask_out = mask;
>
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