Depending on the origin of the packets (and their SA), 802.11 + mesh headers
could be filled in differently. In order to properly deal with that, add a
new field to the lookup key, indicating the type (local, proxied or
forwarded). This can fix spurious packet drop issues that depend on the order
in which nodes/hosts communicate with each other.
Fixes: d5edb9ae8d56 ("wifi: mac80211: mesh fast xmit support")
Signed-off-by: Felix Fietkau <[email protected]>
---
net/mac80211/mesh.c | 8 +++++++-
net/mac80211/mesh.h | 31 ++++++++++++++++++++++++++++---
net/mac80211/mesh_pathtbl.c | 31 ++++++++++++++++++++++---------
net/mac80211/rx.c | 13 ++++++++++---
4 files changed, 67 insertions(+), 16 deletions(-)
diff --git a/net/mac80211/mesh.c b/net/mac80211/mesh.c
index 32475da98d73..cbc9b5e40cb3 100644
--- a/net/mac80211/mesh.c
+++ b/net/mac80211/mesh.c
@@ -747,6 +747,9 @@ bool ieee80211_mesh_xmit_fast(struct ieee80211_sub_if_data *sdata,
struct sk_buff *skb, u32 ctrl_flags)
{
struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
+ struct ieee80211_mesh_fast_tx_key key = {
+ .type = MESH_FAST_TX_TYPE_LOCAL
+ };
struct ieee80211_mesh_fast_tx *entry;
struct ieee80211s_hdr *meshhdr;
u8 sa[ETH_ALEN] __aligned(2);
@@ -782,7 +785,10 @@ bool ieee80211_mesh_xmit_fast(struct ieee80211_sub_if_data *sdata,
return false;
}
- entry = mesh_fast_tx_get(sdata, skb->data);
+ ether_addr_copy(key.addr, skb->data);
+ if (!ether_addr_equal(skb->data + ETH_ALEN, sdata->vif.addr))
+ key.type = MESH_FAST_TX_TYPE_PROXIED;
+ entry = mesh_fast_tx_get(sdata, &key);
if (!entry)
return false;
diff --git a/net/mac80211/mesh.h b/net/mac80211/mesh.h
index d913ce7ba72e..78645f73ad46 100644
--- a/net/mac80211/mesh.h
+++ b/net/mac80211/mesh.h
@@ -134,10 +134,34 @@ struct mesh_path {
#define MESH_FAST_TX_CACHE_THRESHOLD_SIZE 384
#define MESH_FAST_TX_CACHE_TIMEOUT 8000 /* msecs */
+/**
+ * enum ieee80211_mesh_fast_tx_type - cached mesh fast tx entry type
+ *
+ * @MESH_FAST_TX_TYPE_LOCAL: tx from the local vif address as SA
+ * @MESH_FAST_TX_TYPE_PROXIED: local tx with a different SA (e.g. bridged)
+ * @MESH_FAST_TX_TYPE_FORWARDED: forwarded from a different mesh point
+ */
+enum ieee80211_mesh_fast_tx_type {
+ MESH_FAST_TX_TYPE_LOCAL,
+ MESH_FAST_TX_TYPE_PROXIED,
+ MESH_FAST_TX_TYPE_FORWARDED,
+};
+
+/**
+ * struct ieee80211_mesh_fast_tx_key - cached mesh fast tx entry key
+ *
+ * @addr: The Ethernet DA for this entry
+ * @type: cache entry type
+ */
+struct ieee80211_mesh_fast_tx_key {
+ u8 addr[ETH_ALEN] __aligned(2);
+ enum ieee80211_mesh_fast_tx_type type;
+};
+
/**
* struct ieee80211_mesh_fast_tx - cached mesh fast tx entry
* @rhash: rhashtable pointer
- * @addr_key: The Ethernet DA which is the key for this entry
+ * @key: the lookup key for this cache entry
* @fast_tx: base fast_tx data
* @hdr: cached mesh and rfc1042 headers
* @hdrlen: length of mesh + rfc1042
@@ -148,7 +172,7 @@ struct mesh_path {
*/
struct ieee80211_mesh_fast_tx {
struct rhash_head rhash;
- u8 addr_key[ETH_ALEN] __aligned(2);
+ struct ieee80211_mesh_fast_tx_key key;
struct ieee80211_fast_tx fast_tx;
u8 hdr[sizeof(struct ieee80211s_hdr) + sizeof(rfc1042_header)];
@@ -334,7 +358,8 @@ void mesh_path_tx_root_frame(struct ieee80211_sub_if_data *sdata);
bool mesh_action_is_path_sel(struct ieee80211_mgmt *mgmt);
struct ieee80211_mesh_fast_tx *
-mesh_fast_tx_get(struct ieee80211_sub_if_data *sdata, const u8 *addr);
+mesh_fast_tx_get(struct ieee80211_sub_if_data *sdata,
+ struct ieee80211_mesh_fast_tx_key *key);
bool ieee80211_mesh_xmit_fast(struct ieee80211_sub_if_data *sdata,
struct sk_buff *skb, u32 ctrl_flags);
void mesh_fast_tx_cache(struct ieee80211_sub_if_data *sdata,
diff --git a/net/mac80211/mesh_pathtbl.c b/net/mac80211/mesh_pathtbl.c
index 91b55d6a68b9..437199270fa0 100644
--- a/net/mac80211/mesh_pathtbl.c
+++ b/net/mac80211/mesh_pathtbl.c
@@ -37,8 +37,8 @@ static const struct rhashtable_params mesh_rht_params = {
static const struct rhashtable_params fast_tx_rht_params = {
.nelem_hint = 10,
.automatic_shrinking = true,
- .key_len = ETH_ALEN,
- .key_offset = offsetof(struct ieee80211_mesh_fast_tx, addr_key),
+ .key_len = sizeof(struct ieee80211_mesh_fast_tx_key),
+ .key_offset = offsetof(struct ieee80211_mesh_fast_tx, key),
.head_offset = offsetof(struct ieee80211_mesh_fast_tx, rhash),
.hashfn = mesh_table_hash,
};
@@ -431,20 +431,21 @@ static void mesh_fast_tx_entry_free(struct mesh_tx_cache *cache,
}
struct ieee80211_mesh_fast_tx *
-mesh_fast_tx_get(struct ieee80211_sub_if_data *sdata, const u8 *addr)
+mesh_fast_tx_get(struct ieee80211_sub_if_data *sdata,
+ struct ieee80211_mesh_fast_tx_key *key)
{
struct ieee80211_mesh_fast_tx *entry;
struct mesh_tx_cache *cache;
cache = &sdata->u.mesh.tx_cache;
- entry = rhashtable_lookup(&cache->rht, addr, fast_tx_rht_params);
+ entry = rhashtable_lookup(&cache->rht, key, fast_tx_rht_params);
if (!entry)
return NULL;
if (!(entry->mpath->flags & MESH_PATH_ACTIVE) ||
mpath_expired(entry->mpath)) {
spin_lock_bh(&cache->walk_lock);
- entry = rhashtable_lookup(&cache->rht, addr, fast_tx_rht_params);
+ entry = rhashtable_lookup(&cache->rht, key, fast_tx_rht_params);
if (entry)
mesh_fast_tx_entry_free(cache, entry);
spin_unlock_bh(&cache->walk_lock);
@@ -489,18 +490,24 @@ void mesh_fast_tx_cache(struct ieee80211_sub_if_data *sdata,
if (!sta)
return;
+ build.key.type = MESH_FAST_TX_TYPE_LOCAL;
if ((meshhdr->flags & MESH_FLAGS_AE) == MESH_FLAGS_AE_A5_A6) {
/* This is required to keep the mppath alive */
mppath = mpp_path_lookup(sdata, meshhdr->eaddr1);
if (!mppath)
return;
build.mppath = mppath;
+ if (!ether_addr_equal(meshhdr->eaddr2, sdata->vif.addr))
+ build.key.type = MESH_FAST_TX_TYPE_PROXIED;
} else if (ieee80211_has_a4(hdr->frame_control)) {
mppath = mpath;
} else {
return;
}
+ if (!ether_addr_equal(hdr->addr4, sdata->vif.addr))
+ build.key.type = MESH_FAST_TX_TYPE_FORWARDED;
+
/* rate limit, in case fast xmit can't be enabled */
if (mppath->fast_tx_check == jiffies)
return;
@@ -547,7 +554,7 @@ void mesh_fast_tx_cache(struct ieee80211_sub_if_data *sdata,
}
}
- memcpy(build.addr_key, mppath->dst, ETH_ALEN);
+ memcpy(build.key.addr, mppath->dst, ETH_ALEN);
build.timestamp = jiffies;
build.fast_tx.band = info->band;
build.fast_tx.da_offs = offsetof(struct ieee80211_hdr, addr3);
@@ -646,12 +653,18 @@ void mesh_fast_tx_flush_addr(struct ieee80211_sub_if_data *sdata,
const u8 *addr)
{
struct mesh_tx_cache *cache = &sdata->u.mesh.tx_cache;
+ struct ieee80211_mesh_fast_tx_key key = {};
struct ieee80211_mesh_fast_tx *entry;
+ int i;
+ ether_addr_copy(key.addr, addr);
spin_lock_bh(&cache->walk_lock);
- entry = rhashtable_lookup_fast(&cache->rht, addr, fast_tx_rht_params);
- if (entry)
- mesh_fast_tx_entry_free(cache, entry);
+ for (i = MESH_FAST_TX_TYPE_LOCAL; i < MESH_FAST_TX_TYPE_FORWARDED; i++) {
+ key.type = i;
+ entry = rhashtable_lookup_fast(&cache->rht, &key, fast_tx_rht_params);
+ if (entry)
+ mesh_fast_tx_entry_free(cache, entry);
+ }
spin_unlock_bh(&cache->walk_lock);
}
diff --git a/net/mac80211/rx.c b/net/mac80211/rx.c
index 685185dc04f9..6e24864f9a40 100644
--- a/net/mac80211/rx.c
+++ b/net/mac80211/rx.c
@@ -2763,7 +2763,10 @@ ieee80211_rx_mesh_fast_forward(struct ieee80211_sub_if_data *sdata,
struct sk_buff *skb, int hdrlen)
{
struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
- struct ieee80211_mesh_fast_tx *entry = NULL;
+ struct ieee80211_mesh_fast_tx_key key = {
+ .type = MESH_FAST_TX_TYPE_FORWARDED
+ };
+ struct ieee80211_mesh_fast_tx *entry;
struct ieee80211s_hdr *mesh_hdr;
struct tid_ampdu_tx *tid_tx;
struct sta_info *sta;
@@ -2772,9 +2775,13 @@ ieee80211_rx_mesh_fast_forward(struct ieee80211_sub_if_data *sdata,
mesh_hdr = (struct ieee80211s_hdr *)(skb->data + sizeof(eth));
if ((mesh_hdr->flags & MESH_FLAGS_AE) == MESH_FLAGS_AE_A5_A6)
- entry = mesh_fast_tx_get(sdata, mesh_hdr->eaddr1);
+ ether_addr_copy(key.addr, mesh_hdr->eaddr1);
else if (!(mesh_hdr->flags & MESH_FLAGS_AE))
- entry = mesh_fast_tx_get(sdata, skb->data);
+ ether_addr_copy(key.addr, skb->data);
+ else
+ return false;
+
+ entry = mesh_fast_tx_get(sdata, &key);
if (!entry)
return false;
--
2.44.0
On Fri, 2024-04-12 at 14:06 +0200, Felix Fietkau wrote:
>
> +struct ieee80211_mesh_fast_tx_key {
> + u8 addr[ETH_ALEN] __aligned(2);
> + enum ieee80211_mesh_fast_tx_type type;
> +};
Does it make sense to hash a bunch of zeroes there if the compiler
allocates more than a single byte for "type"? It's uglier, but maybe
makes more sense to not do that? There's also padding in there in that
case.
> @@ -646,12 +653,18 @@ void mesh_fast_tx_flush_addr(struct ieee80211_sub_if_data *sdata,
> const u8 *addr)
> {
> struct mesh_tx_cache *cache = &sdata->u.mesh.tx_cache;
> + struct ieee80211_mesh_fast_tx_key key = {};
> struct ieee80211_mesh_fast_tx *entry;
> + int i;
>
> + ether_addr_copy(key.addr, addr);
> spin_lock_bh(&cache->walk_lock);
> - entry = rhashtable_lookup_fast(&cache->rht, addr, fast_tx_rht_params);
> - if (entry)
> - mesh_fast_tx_entry_free(cache, entry);
> + for (i = MESH_FAST_TX_TYPE_LOCAL; i < MESH_FAST_TX_TYPE_FORWARDED; i++) {
Seems that should be "i <= ...FORWARDED".
Maybe better then to add a NUM_MESH_FAST_TX_TYPES or so to the enum and
then use "i < NUM_MESH_FAST_TX_TYPES", so new additions won't have to
update this, if they ever happen.
johannes
On 12.04.24 14:55, Johannes Berg wrote:
> On Fri, 2024-04-12 at 14:06 +0200, Felix Fietkau wrote:
>>
>> +struct ieee80211_mesh_fast_tx_key {
>> + u8 addr[ETH_ALEN] __aligned(2);
>> + enum ieee80211_mesh_fast_tx_type type;
>> +};
>
> Does it make sense to hash a bunch of zeroes there if the compiler
> allocates more than a single byte for "type"? It's uglier, but maybe
> makes more sense to not do that? There's also padding in there in that
> case.
Good point. I will change the type to u16 to make the size explicit and
make the struct size a multiple of 4 for faster hashing.
>> @@ -646,12 +653,18 @@ void mesh_fast_tx_flush_addr(struct ieee80211_sub_if_data *sdata,
>> const u8 *addr)
>> {
>> struct mesh_tx_cache *cache = &sdata->u.mesh.tx_cache;
>> + struct ieee80211_mesh_fast_tx_key key = {};
>> struct ieee80211_mesh_fast_tx *entry;
>> + int i;
>>
>> + ether_addr_copy(key.addr, addr);
>> spin_lock_bh(&cache->walk_lock);
>> - entry = rhashtable_lookup_fast(&cache->rht, addr, fast_tx_rht_params);
>> - if (entry)
>> - mesh_fast_tx_entry_free(cache, entry);
>> + for (i = MESH_FAST_TX_TYPE_LOCAL; i < MESH_FAST_TX_TYPE_FORWARDED; i++) {
>
> Seems that should be "i <= ...FORWARDED".
>
> Maybe better then to add a NUM_MESH_FAST_TX_TYPES or so to the enum and
> then use "i < NUM_MESH_FAST_TX_TYPES", so new additions won't have to
> update this, if they ever happen.
Will do, thanks.
- Felix