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authorLinus Lüssing <ll@simonwunderlich.de>2020-06-17 10:30:33 +0300
committerJohannes Berg <johannes.berg@intel.com>2020-07-31 10:24:23 +0300
commite3718a611470d311a92c60d4eb535270b49a7108 (patch)
tree3e5daf705d3dfd6cc2a128623e0e4dbc897d8aac /net/wireless
parent2f1805ea209a146669e0b660633ed22f49e1dd49 (diff)
downloadlinux-e3718a611470d311a92c60d4eb535270b49a7108.tar.xz
cfg80211/mac80211: add mesh_param "mesh_nolearn" to skip path discovery
Currently, before being able to forward a packet between two 802.11s nodes, both a PLINK handshake is performed upon receiving a beacon and then later a PREQ/PREP exchange for path discovery is performed on demand upon receiving a data frame to forward. When running a mesh protocol on top of an 802.11s interface, like batman-adv, we do not need the multi-hop mesh routing capabilities of 802.11s and usually set mesh_fwding=0. However, even with mesh_fwding=0 the PREQ/PREP path discovery is still performed on demand. Even though in this scenario the next hop PREQ/PREP will determine is always the direct 11s neighbor node. The new mesh_nolearn parameter allows to skip the PREQ/PREP exchange in this scenario, leading to a reduced delay, reduced packet buffering and simplifies HWMP in general. mesh_nolearn is still rather conservative in that if the packet destination is not a direct 11s neighbor, it will fall back to PREQ/PREP path discovery. For normal, multi-hop 802.11s mesh routing it is usually not advisable to enable mesh_nolearn as a transmission to a direct but distant neighbor might be worse than reaching that same node via a more robust / higher throughput etc. multi-hop path. Cc: Sven Eckelmann <sven@narfation.org> Cc: Simon Wunderlich <sw@simonwunderlich.de> Signed-off-by: Linus Lüssing <ll@simonwunderlich.de> Link: https://lore.kernel.org/r/20200617073034.26149-1-linus.luessing@c0d3.blue [fix nl80211 policy to range 0/1 only] Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Diffstat (limited to 'net/wireless')
-rw-r--r--net/wireless/mesh.c1
-rw-r--r--net/wireless/nl80211.c7
-rw-r--r--net/wireless/trace.h4
3 files changed, 10 insertions, 2 deletions
diff --git a/net/wireless/mesh.c b/net/wireless/mesh.c
index eac5aa1419fc..e4e363138279 100644
--- a/net/wireless/mesh.c
+++ b/net/wireless/mesh.c
@@ -78,6 +78,7 @@ const struct mesh_config default_mesh_config = {
.power_mode = NL80211_MESH_POWER_ACTIVE,
.dot11MeshAwakeWindowDuration = MESH_DEFAULT_AWAKE_WINDOW,
.plink_timeout = MESH_DEFAULT_PLINK_TIMEOUT,
+ .dot11MeshNolearn = false,
};
const struct mesh_setup default_mesh_setup = {
diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c
index 6fdf818f66cf..257c06315464 100644
--- a/net/wireless/nl80211.c
+++ b/net/wireless/nl80211.c
@@ -6885,7 +6885,9 @@ static int nl80211_get_mesh_config(struct sk_buff *skb,
nla_put_u32(msg, NL80211_MESHCONF_PLINK_TIMEOUT,
cur_params.plink_timeout) ||
nla_put_u8(msg, NL80211_MESHCONF_CONNECTED_TO_GATE,
- cur_params.dot11MeshConnectedToMeshGate))
+ cur_params.dot11MeshConnectedToMeshGate) ||
+ nla_put_u8(msg, NL80211_MESHCONF_NOLEARN,
+ cur_params.dot11MeshNolearn))
goto nla_put_failure;
nla_nest_end(msg, pinfoattr);
genlmsg_end(msg, hdr);
@@ -6943,6 +6945,7 @@ nl80211_meshconf_params_policy[NL80211_MESHCONF_ATTR_MAX+1] = {
[NL80211_MESHCONF_AWAKE_WINDOW] = { .type = NLA_U16 },
[NL80211_MESHCONF_PLINK_TIMEOUT] = { .type = NLA_U32 },
[NL80211_MESHCONF_CONNECTED_TO_GATE] = NLA_POLICY_RANGE(NLA_U8, 0, 1),
+ [NL80211_MESHCONF_NOLEARN] = NLA_POLICY_RANGE(NLA_U8, 0, 1),
};
static const struct nla_policy
@@ -7094,6 +7097,8 @@ do { \
NL80211_MESHCONF_AWAKE_WINDOW, nla_get_u16);
FILL_IN_MESH_PARAM_IF_SET(tb, cfg, plink_timeout, mask,
NL80211_MESHCONF_PLINK_TIMEOUT, nla_get_u32);
+ FILL_IN_MESH_PARAM_IF_SET(tb, cfg, dot11MeshNolearn, mask,
+ NL80211_MESHCONF_NOLEARN, nla_get_u8);
if (mask_out)
*mask_out = mask;
diff --git a/net/wireless/trace.h b/net/wireless/trace.h
index b23cab016521..6e218a0acd4e 100644
--- a/net/wireless/trace.h
+++ b/net/wireless/trace.h
@@ -68,7 +68,8 @@
__field(u16, ht_opmode) \
__field(u32, dot11MeshHWMPactivePathToRootTimeout) \
__field(u16, dot11MeshHWMProotInterval) \
- __field(u16, dot11MeshHWMPconfirmationInterval)
+ __field(u16, dot11MeshHWMPconfirmationInterval) \
+ __field(bool, dot11MeshNolearn)
#define MESH_CFG_ASSIGN \
do { \
__entry->dot11MeshRetryTimeout = conf->dot11MeshRetryTimeout; \
@@ -109,6 +110,7 @@
conf->dot11MeshHWMProotInterval; \
__entry->dot11MeshHWMPconfirmationInterval = \
conf->dot11MeshHWMPconfirmationInterval; \
+ __entry->dot11MeshNolearn = conf->dot11MeshNolearn; \
} while (0)
#define CHAN_ENTRY __field(enum nl80211_band, band) \