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realtek-RTL8812AU/core/mesh/rtw_mesh_pathtbl.c

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/******************************************************************************
*
* Copyright(c) 2007 - 2017 Realtek Corporation.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of version 2 of the GNU General Public License as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
*****************************************************************************/
#define _RTW_MESH_PATHTBL_C_
#ifdef CONFIG_RTW_MESH
#include <drv_types.h>
#include <linux/jhash.h>
#ifdef PLATFORM_LINUX
#if (LINUX_VERSION_CODE >= KERNEL_VERSION(3, 0, 0))
static void rtw_mpath_free_rcu(struct rtw_mesh_path *mpath)
{
kfree_rcu(mpath, rcu);
rtw_mstat_update(MSTAT_TYPE_PHY, MSTAT_FREE, sizeof(struct rtw_mesh_path));
}
#else
static void rtw_mpath_free_rcu_callback(rtw_rcu_head *head)
{
struct rtw_mesh_path *mpath;
mpath = container_of(head, struct rtw_mesh_path, rcu);
rtw_mfree(mpath, sizeof(struct rtw_mesh_path));
}
static void rtw_mpath_free_rcu(struct rtw_mesh_path *mpath)
{
call_rcu(&mpath->rcu, rtw_mpath_free_rcu_callback);
}
#endif
#endif /* PLATFORM_LINUX */
static void rtw_mesh_path_free_rcu(struct rtw_mesh_table *tbl, struct rtw_mesh_path *mpath);
static u32 rtw_mesh_table_hash(const void *addr, u32 len, u32 seed)
{
/* Use last four bytes of hw addr as hash index */
return jhash_1word(*(u32 *)(addr+2), seed);
}
static const rtw_rhashtable_params rtw_mesh_rht_params = {
.nelem_hint = 2,
.automatic_shrinking = true,
.key_len = ETH_ALEN,
.key_offset = offsetof(struct rtw_mesh_path, dst),
.head_offset = offsetof(struct rtw_mesh_path, rhash),
.hashfn = rtw_mesh_table_hash,
};
static inline bool rtw_mpath_expired(struct rtw_mesh_path *mpath)
{
return (mpath->flags & RTW_MESH_PATH_ACTIVE) &&
rtw_time_after(rtw_get_current_time(), mpath->exp_time) &&
!(mpath->flags & RTW_MESH_PATH_FIXED);
}
static void rtw_mesh_path_rht_free(void *ptr, void *tblptr)
{
struct rtw_mesh_path *mpath = ptr;
struct rtw_mesh_table *tbl = tblptr;
rtw_mesh_path_free_rcu(tbl, mpath);
}
static struct rtw_mesh_table *rtw_mesh_table_alloc(void)
{
struct rtw_mesh_table *newtbl;
newtbl = rtw_malloc(sizeof(struct rtw_mesh_table));
if (!newtbl)
return NULL;
rtw_hlist_head_init(&newtbl->known_gates);
ATOMIC_SET(&newtbl->entries, 0);
_rtw_spinlock_init(&newtbl->gates_lock);
return newtbl;
}
static void rtw_mesh_table_free(struct rtw_mesh_table *tbl)
{
rtw_rhashtable_free_and_destroy(&tbl->rhead,
rtw_mesh_path_rht_free, tbl);
rtw_mfree(tbl, sizeof(struct rtw_mesh_table));
}
/**
*
* rtw_mesh_path_assign_nexthop - update mesh path next hop
*
* @mpath: mesh path to update
* @sta: next hop to assign
*
* Locking: mpath->state_lock must be held when calling this function
*/
void rtw_mesh_path_assign_nexthop(struct rtw_mesh_path *mpath, struct sta_info *sta)
{
struct xmit_frame *xframe;
_list *list, *head;
rtw_rcu_assign_pointer(mpath->next_hop, sta);
enter_critical_bh(&mpath->frame_queue.lock);
head = &mpath->frame_queue.queue;
list = get_next(head);
while (rtw_end_of_queue_search(head, list) == _FALSE) {
xframe = LIST_CONTAINOR(list, struct xmit_frame, list);
list = get_next(list);
_rtw_memcpy(xframe->attrib.ra, sta->cmn.mac_addr, ETH_ALEN);
}
exit_critical_bh(&mpath->frame_queue.lock);
}
static void rtw_prepare_for_gate(struct xmit_frame *xframe, char *dst_addr,
struct rtw_mesh_path *gate_mpath)
{
struct pkt_attrib *attrib = &xframe->attrib;
char *next_hop;
if (attrib->mesh_frame_mode == MESH_UCAST_DATA)
attrib->mesh_frame_mode = MESH_UCAST_PX_DATA;
/* update next hop */
rtw_rcu_read_lock();
next_hop = rtw_rcu_dereference(gate_mpath->next_hop)->cmn.mac_addr;
_rtw_memcpy(attrib->ra, next_hop, ETH_ALEN);
rtw_rcu_read_unlock();
_rtw_memcpy(attrib->mda, dst_addr, ETH_ALEN);
}
/**
*
* rtw_mesh_path_move_to_queue - Move or copy frames from one mpath queue to another
*
* This function is used to transfer or copy frames from an unresolved mpath to
* a gate mpath. The function also adds the Address Extension field and
* updates the next hop.
*
* If a frame already has an Address Extension field, only the next hop and
* destination addresses are updated.
*
* The gate mpath must be an active mpath with a valid mpath->next_hop.
*
* @mpath: An active mpath the frames will be sent to (i.e. the gate)
* @from_mpath: The failed mpath
* @copy: When true, copy all the frames to the new mpath queue. When false,
* move them.
*/
static void rtw_mesh_path_move_to_queue(struct rtw_mesh_path *gate_mpath,
struct rtw_mesh_path *from_mpath,
bool copy)
{
struct xmit_frame *fskb;
_list *list, *head;
_list failq;
u32 failq_len;
_irqL flags;
if (rtw_warn_on(gate_mpath == from_mpath))
return;
if (rtw_warn_on(!gate_mpath->next_hop))
return;
_rtw_init_listhead(&failq);
_enter_critical_bh(&from_mpath->frame_queue.lock, &flags);
rtw_list_splice_init(&from_mpath->frame_queue.queue, &failq);
failq_len = from_mpath->frame_queue_len;
from_mpath->frame_queue_len = 0;
_exit_critical_bh(&from_mpath->frame_queue.lock, &flags);
head = &failq;
list = get_next(head);
while (rtw_end_of_queue_search(head, list) == _FALSE) {
if (gate_mpath->frame_queue_len >= RTW_MESH_FRAME_QUEUE_LEN) {
RTW_MPATH_DBG(FUNC_ADPT_FMT" mpath queue for gate %pM is full!\n"
, FUNC_ADPT_ARG(gate_mpath->adapter), gate_mpath->dst);
break;
}
fskb = LIST_CONTAINOR(list, struct xmit_frame, list);
list = get_next(list);
rtw_list_delete(&fskb->list);
failq_len--;
rtw_prepare_for_gate(fskb, gate_mpath->dst, gate_mpath);
_enter_critical_bh(&gate_mpath->frame_queue.lock, &flags);
rtw_list_insert_tail(&fskb->list, get_list_head(&gate_mpath->frame_queue));
gate_mpath->frame_queue_len++;
_exit_critical_bh(&gate_mpath->frame_queue.lock, &flags);
#if 0 /* TODO: copy */
skb = rtw_skb_copy(fskb);
if (rtw_warn_on(!skb))
break;
rtw_prepare_for_gate(skb, gate_mpath->dst, gate_mpath);
skb_queue_tail(&gate_mpath->frame_queue, skb);
if (copy)
continue;
__skb_unlink(fskb, &failq);
rtw_skb_free(fskb);
#endif
}
RTW_MPATH_DBG(FUNC_ADPT_FMT" mpath queue for gate %pM has %d frames\n"
, FUNC_ADPT_ARG(gate_mpath->adapter), gate_mpath->dst, gate_mpath->frame_queue_len);
if (!copy)
return;
_enter_critical_bh(&from_mpath->frame_queue.lock, &flags);
rtw_list_splice(&failq, &from_mpath->frame_queue.queue);
from_mpath->frame_queue_len += failq_len;
_exit_critical_bh(&from_mpath->frame_queue.lock, &flags);
}
static struct rtw_mesh_path *rtw_mpath_lookup(struct rtw_mesh_table *tbl, const u8 *dst)
{
struct rtw_mesh_path *mpath;
if (!tbl)
return NULL;
mpath = rtw_rhashtable_lookup_fast(&tbl->rhead, dst, rtw_mesh_rht_params);
if (mpath && rtw_mpath_expired(mpath)) {
enter_critical_bh(&mpath->state_lock);
mpath->flags &= ~RTW_MESH_PATH_ACTIVE;
exit_critical_bh(&mpath->state_lock);
}
return mpath;
}
/**
* rtw_mesh_path_lookup - look up a path in the mesh path table
* @sdata: local subif
* @dst: hardware address (ETH_ALEN length) of destination
*
* Returns: pointer to the mesh path structure, or NULL if not found
*
* Locking: must be called within a read rcu section.
*/
struct rtw_mesh_path *
rtw_mesh_path_lookup(_adapter *adapter, const u8 *dst)
{
return rtw_mpath_lookup(adapter->mesh_info.mesh_paths, dst);
}
struct rtw_mesh_path *
rtw_mpp_path_lookup(_adapter *adapter, const u8 *dst)
{
return rtw_mpath_lookup(adapter->mesh_info.mpp_paths, dst);
}
static struct rtw_mesh_path *
__rtw_mesh_path_lookup_by_idx(struct rtw_mesh_table *tbl, int idx)
{
int i = 0, ret;
struct rtw_mesh_path *mpath = NULL;
rtw_rhashtable_iter iter;
if (!tbl)
return NULL;
ret = rtw_rhashtable_walk_enter(&tbl->rhead, &iter);
if (ret)
return NULL;
ret = rtw_rhashtable_walk_start(&iter);
if (ret && ret != -EAGAIN)
goto err;
while ((mpath = rtw_rhashtable_walk_next(&iter))) {
if (IS_ERR(mpath) && PTR_ERR(mpath) == -EAGAIN)
continue;
if (IS_ERR(mpath))
break;
if (i++ == idx)
break;
}
err:
rtw_rhashtable_walk_stop(&iter);
rtw_rhashtable_walk_exit(&iter);
if (IS_ERR(mpath) || !mpath)
return NULL;
if (rtw_mpath_expired(mpath)) {
enter_critical_bh(&mpath->state_lock);
mpath->flags &= ~RTW_MESH_PATH_ACTIVE;
exit_critical_bh(&mpath->state_lock);
}
return mpath;
}
/**
* rtw_mesh_path_lookup_by_idx - look up a path in the mesh path table by its index
* @idx: index
* @sdata: local subif, or NULL for all entries
*
* Returns: pointer to the mesh path structure, or NULL if not found.
*
* Locking: must be called within a read rcu section.
*/
struct rtw_mesh_path *
rtw_mesh_path_lookup_by_idx(_adapter *adapter, int idx)
{
return __rtw_mesh_path_lookup_by_idx(adapter->mesh_info.mesh_paths, idx);
}
void dump_mpath(void *sel, _adapter *adapter)
{
struct rtw_mesh_path *mpath;
int idx = 0;
char dst[ETH_ALEN];
char next_hop[ETH_ALEN];
u32 sn, metric, qlen;
u32 exp_ms = 0, dto_ms;
u8 drty;
enum rtw_mesh_path_flags flags;
RTW_PRINT_SEL(sel, "%-17s %-17s %-10s %-10s %-4s %-6s %-6s %-4s flags\n"
, "dst", "next_hop", "sn", "metric", "qlen", "exp_ms", "dto_ms", "drty"
);
do {
rtw_rcu_read_lock();
mpath = rtw_mesh_path_lookup_by_idx(adapter, idx);
if (mpath) {
_rtw_memcpy(dst, mpath->dst, ETH_ALEN);
_rtw_memcpy(next_hop, mpath->next_hop->cmn.mac_addr, ETH_ALEN);
sn = mpath->sn;
metric = mpath->metric;
qlen = mpath->frame_queue_len;
if (rtw_time_after(mpath->exp_time, rtw_get_current_time()))
exp_ms = rtw_get_remaining_time_ms(mpath->exp_time);
dto_ms = rtw_systime_to_ms(mpath->discovery_timeout);
drty = mpath->discovery_retries;
flags = mpath->flags;
}
rtw_rcu_read_unlock();
if (mpath) {
RTW_PRINT_SEL(sel, MAC_FMT" "MAC_FMT" %10u %10u %4u %6u %6u %4u%s%s%s%s%s\n"
, MAC_ARG(dst), MAC_ARG(next_hop), sn, metric, qlen
, exp_ms < 999999 ? exp_ms : 999999
, dto_ms < 999999 ? dto_ms : 999999
, drty
, (flags & RTW_MESH_PATH_ACTIVE) ? " ACT" : ""
, (flags & RTW_MESH_PATH_RESOLVING) ? " RSVING" : ""
, (flags & RTW_MESH_PATH_SN_VALID) ? " SN_VALID" : ""
, (flags & RTW_MESH_PATH_FIXED) ? " FIXED" : ""
, (flags & RTW_MESH_PATH_RESOLVED) ? " RSVED" : ""
);
}
idx++;
} while (mpath);
}
/**
* rtw_mpp_path_lookup_by_idx - look up a path in the proxy path table by its index
* @idx: index
* @sdata: local subif, or NULL for all entries
*
* Returns: pointer to the proxy path structure, or NULL if not found.
*
* Locking: must be called within a read rcu section.
*/
struct rtw_mesh_path *
rtw_mpp_path_lookup_by_idx(_adapter *adapter, int idx)
{
return __rtw_mesh_path_lookup_by_idx(adapter->mesh_info.mpp_paths, idx);
}
/**
* rtw_mesh_path_add_gate - add the given mpath to a mesh gate to our path table
* @mpath: gate path to add to table
*/
int rtw_mesh_path_add_gate(struct rtw_mesh_path *mpath)
{
struct rtw_mesh_cfg *mcfg;
struct rtw_mesh_info *minfo;
struct rtw_mesh_table *tbl;
int err, ori_num_gates;
rtw_rcu_read_lock();
tbl = mpath->adapter->mesh_info.mesh_paths;
if (!tbl) {
err = -ENOENT;
goto err_rcu;
}
enter_critical_bh(&mpath->state_lock);
mcfg = &mpath->adapter->mesh_cfg;
mpath->gate_timeout = rtw_get_current_time() +
rtw_ms_to_systime(mcfg->path_gate_timeout_factor *
mpath->gate_ann_int);
if (mpath->is_gate) {
err = -EEXIST;
exit_critical_bh(&mpath->state_lock);
goto err_rcu;
}
minfo = &mpath->adapter->mesh_info;
mpath->is_gate = true;
_rtw_spinlock(&tbl->gates_lock);
ori_num_gates = minfo->num_gates;
minfo->num_gates++;
rtw_hlist_add_head_rcu(&mpath->gate_list, &tbl->known_gates);
if (ori_num_gates == 0
|| rtw_macaddr_is_larger(mpath->dst, minfo->max_addr_gate->dst)
) {
minfo->max_addr_gate = mpath;
minfo->max_addr_gate_is_larger_than_self =
rtw_macaddr_is_larger(mpath->dst, adapter_mac_addr(mpath->adapter));
}
_rtw_spinunlock(&tbl->gates_lock);
exit_critical_bh(&mpath->state_lock);
if (ori_num_gates == 0) {
update_beacon(mpath->adapter, WLAN_EID_MESH_CONFIG, NULL, _TRUE);
#if CONFIG_RTW_MESH_CTO_MGATE_CARRIER
if (!rtw_mesh_cto_mgate_required(mpath->adapter))
rtw_netif_carrier_on(mpath->adapter->pnetdev);
#endif
}
RTW_MPATH_DBG(
FUNC_ADPT_FMT" Mesh path: Recorded new gate: %pM. %d known gates\n",
FUNC_ADPT_ARG(mpath->adapter),
mpath->dst, mpath->adapter->mesh_info.num_gates);
err = 0;
err_rcu:
rtw_rcu_read_unlock();
return err;
}
/**
* rtw_mesh_gate_del - remove a mesh gate from the list of known gates
* @tbl: table which holds our list of known gates
* @mpath: gate mpath
*/
void rtw_mesh_gate_del(struct rtw_mesh_table *tbl, struct rtw_mesh_path *mpath)
{
struct rtw_mesh_cfg *mcfg;
struct rtw_mesh_info *minfo;
int ori_num_gates;
rtw_lockdep_assert_held(&mpath->state_lock);
if (!mpath->is_gate)
return;
mcfg = &mpath->adapter->mesh_cfg;
minfo = &mpath->adapter->mesh_info;
mpath->is_gate = false;
enter_critical_bh(&tbl->gates_lock);
rtw_hlist_del_rcu(&mpath->gate_list);
ori_num_gates = minfo->num_gates;
minfo->num_gates--;
if (ori_num_gates == 1) {
minfo->max_addr_gate = NULL;
minfo->max_addr_gate_is_larger_than_self = 0;
} else if (minfo->max_addr_gate == mpath) {
struct rtw_mesh_path *gate, *max_addr_gate = NULL;
rtw_hlist_node *node;
rtw_hlist_for_each_entry_rcu(gate, node, &tbl->known_gates, gate_list) {
if (!max_addr_gate || rtw_macaddr_is_larger(gate->dst, max_addr_gate->dst))
max_addr_gate = gate;
}
minfo->max_addr_gate = max_addr_gate;
minfo->max_addr_gate_is_larger_than_self =
rtw_macaddr_is_larger(max_addr_gate->dst, adapter_mac_addr(mpath->adapter));
}
exit_critical_bh(&tbl->gates_lock);
if (ori_num_gates == 1) {
update_beacon(mpath->adapter, WLAN_EID_MESH_CONFIG, NULL, _TRUE);
#if CONFIG_RTW_MESH_CTO_MGATE_CARRIER
if (rtw_mesh_cto_mgate_required(mpath->adapter))
rtw_netif_carrier_off(mpath->adapter->pnetdev);
#endif
}
RTW_MPATH_DBG(
FUNC_ADPT_FMT" Mesh path: Deleted gate: %pM. %d known gates\n",
FUNC_ADPT_ARG(mpath->adapter),
mpath->dst, mpath->adapter->mesh_info.num_gates);
}
/**
* rtw_mesh_gate_search - search a mesh gate from the list of known gates
* @tbl: table which holds our list of known gates
* @addr: address of gate
*/
bool rtw_mesh_gate_search(struct rtw_mesh_table *tbl, const u8 *addr)
{
struct rtw_mesh_path *gate;
rtw_hlist_node *node;
bool exist = 0;
rtw_rcu_read_lock();
rtw_hlist_for_each_entry_rcu(gate, node, &tbl->known_gates, gate_list) {
if (_rtw_memcmp(gate->dst, addr, ETH_ALEN) == _TRUE) {
exist = 1;
break;
}
}
rtw_rcu_read_unlock();
return exist;
}
/**
* rtw_mesh_gate_num - number of gates known to this interface
* @sdata: subif data
*/
int rtw_mesh_gate_num(_adapter *adapter)
{
return adapter->mesh_info.num_gates;
}
bool rtw_mesh_is_primary_gate(_adapter *adapter)
{
struct rtw_mesh_cfg *mcfg = &adapter->mesh_cfg;
struct rtw_mesh_info *minfo = &adapter->mesh_info;
return mcfg->dot11MeshGateAnnouncementProtocol
&& !minfo->max_addr_gate_is_larger_than_self;
}
void dump_known_gates(void *sel, _adapter *adapter)
{
struct rtw_mesh_info *minfo = &adapter->mesh_info;
struct rtw_mesh_table *tbl;
struct rtw_mesh_path *gate;
rtw_hlist_node *node;
if (!rtw_mesh_gate_num(adapter))
goto exit;
rtw_rcu_read_lock();
tbl = minfo->mesh_paths;
if (!tbl)
goto unlock;
RTW_PRINT_SEL(sel, "num:%d\n", rtw_mesh_gate_num(adapter));
rtw_hlist_for_each_entry_rcu(gate, node, &tbl->known_gates, gate_list) {
RTW_PRINT_SEL(sel, "%c"MAC_FMT"\n"
, gate == minfo->max_addr_gate ? '*' : ' '
, MAC_ARG(gate->dst));
}
unlock:
rtw_rcu_read_unlock();
exit:
return;
}
static
struct rtw_mesh_path *rtw_mesh_path_new(_adapter *adapter,
const u8 *dst)
{
struct rtw_mesh_path *new_mpath;
new_mpath = rtw_zmalloc(sizeof(struct rtw_mesh_path));
if (!new_mpath)
return NULL;
_rtw_memcpy(new_mpath->dst, dst, ETH_ALEN);
_rtw_memset(new_mpath->rann_snd_addr, 0xFF, ETH_ALEN);
new_mpath->is_root = false;
new_mpath->adapter = adapter;
new_mpath->flags = 0;
new_mpath->gate_asked = false;
_rtw_init_queue(&new_mpath->frame_queue);
new_mpath->frame_queue_len = 0;
new_mpath->exp_time = rtw_get_current_time();
_rtw_spinlock_init(&new_mpath->state_lock);
rtw_init_timer(&new_mpath->timer, adapter, rtw_mesh_path_timer, new_mpath);
return new_mpath;
}
/**
* rtw_mesh_path_add - allocate and add a new path to the mesh path table
* @dst: destination address of the path (ETH_ALEN length)
* @sdata: local subif
*
* Returns: 0 on success
*
* State: the initial state of the new path is set to 0
*/
struct rtw_mesh_path *rtw_mesh_path_add(_adapter *adapter,
const u8 *dst)
{
struct rtw_mesh_table *tbl = adapter->mesh_info.mesh_paths;
struct rtw_mesh_path *mpath, *new_mpath;
int ret;
if (!tbl)
return ERR_PTR(-ENOTSUPP);
if (_rtw_memcmp(dst, adapter_mac_addr(adapter), ETH_ALEN) == _TRUE)
/* never add ourselves as neighbours */
return ERR_PTR(-ENOTSUPP);
if (is_multicast_mac_addr(dst))
return ERR_PTR(-ENOTSUPP);
if (ATOMIC_INC_UNLESS(&adapter->mesh_info.mpaths, RTW_MESH_MAX_MPATHS) == 0)
return ERR_PTR(-ENOSPC);
new_mpath = rtw_mesh_path_new(adapter, dst);
if (!new_mpath)
return ERR_PTR(-ENOMEM);
do {
ret = rtw_rhashtable_lookup_insert_fast(&tbl->rhead,
&new_mpath->rhash,
rtw_mesh_rht_params);
if (ret == -EEXIST)
mpath = rtw_rhashtable_lookup_fast(&tbl->rhead,
dst,
rtw_mesh_rht_params);
} while (unlikely(ret == -EEXIST && !mpath));
if (ret && ret != -EEXIST)
return ERR_PTR(ret);
/* At this point either new_mpath was added, or we found a
* matching entry already in the table; in the latter case
* free the unnecessary new entry.
*/
if (ret == -EEXIST) {
rtw_mfree(new_mpath, sizeof(struct rtw_mesh_path));
new_mpath = mpath;
}
adapter->mesh_info.mesh_paths_generation++;
return new_mpath;
}
int rtw_mpp_path_add(_adapter *adapter,
const u8 *dst, const u8 *mpp)
{
struct rtw_mesh_table *tbl = adapter->mesh_info.mpp_paths;
struct rtw_mesh_path *new_mpath;
int ret;
if (!tbl)
return -ENOTSUPP;
if (_rtw_memcmp(dst, adapter_mac_addr(adapter), ETH_ALEN) == _TRUE)
/* never add ourselves as neighbours */
return -ENOTSUPP;
if (is_multicast_mac_addr(dst))
return -ENOTSUPP;
new_mpath = rtw_mesh_path_new(adapter, dst);
if (!new_mpath)
return -ENOMEM;
_rtw_memcpy(new_mpath->mpp, mpp, ETH_ALEN);
ret = rtw_rhashtable_lookup_insert_fast(&tbl->rhead,
&new_mpath->rhash,
rtw_mesh_rht_params);
adapter->mesh_info.mpp_paths_generation++;
return ret;
}
void dump_mpp(void *sel, _adapter *adapter)
{
struct rtw_mesh_path *mpath;
int idx = 0;
char dst[ETH_ALEN];
char mpp[ETH_ALEN];
RTW_PRINT_SEL(sel, "%-17s %-17s\n", "dst", "mpp");
do {
rtw_rcu_read_lock();
mpath = rtw_mpp_path_lookup_by_idx(adapter, idx);
if (mpath) {
_rtw_memcpy(dst, mpath->dst, ETH_ALEN);
_rtw_memcpy(mpp, mpath->mpp, ETH_ALEN);
}
rtw_rcu_read_unlock();
if (mpath) {
RTW_PRINT_SEL(sel, MAC_FMT" "MAC_FMT"\n"
, MAC_ARG(dst), MAC_ARG(mpp));
}
idx++;
} while (mpath);
}
/**
* rtw_mesh_plink_broken - deactivates paths and sends perr when a link breaks
*
* @sta: broken peer link
*
* This function must be called from the rate control algorithm if enough
* delivery errors suggest that a peer link is no longer usable.
*/
void rtw_mesh_plink_broken(struct sta_info *sta)
{
_adapter *adapter = sta->padapter;
struct rtw_mesh_table *tbl = adapter->mesh_info.mesh_paths;
static const u8 bcast[ETH_ALEN] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff};
struct rtw_mesh_path *mpath;
rtw_rhashtable_iter iter;
int ret;
if (!tbl)
return;
ret = rtw_rhashtable_walk_enter(&tbl->rhead, &iter);
if (ret)
return;
ret = rtw_rhashtable_walk_start(&iter);
if (ret && ret != -EAGAIN)
goto out;
while ((mpath = rtw_rhashtable_walk_next(&iter))) {
if (IS_ERR(mpath) && PTR_ERR(mpath) == -EAGAIN)
continue;
if (IS_ERR(mpath))
break;
if (rtw_rcu_access_pointer(mpath->next_hop) == sta &&
mpath->flags & RTW_MESH_PATH_ACTIVE &&
!(mpath->flags & RTW_MESH_PATH_FIXED)) {
enter_critical_bh(&mpath->state_lock);
mpath->flags &= ~RTW_MESH_PATH_ACTIVE;
++mpath->sn;
exit_critical_bh(&mpath->state_lock);
rtw_mesh_path_error_tx(adapter,
adapter->mesh_cfg.element_ttl,
mpath->dst, mpath->sn,
WLAN_REASON_MESH_PATH_DEST_UNREACHABLE, bcast);
}
}
out:
rtw_rhashtable_walk_stop(&iter);
rtw_rhashtable_walk_exit(&iter);
}
static void rtw_mesh_path_free_rcu(struct rtw_mesh_table *tbl,
struct rtw_mesh_path *mpath)
{
_adapter *adapter = mpath->adapter;
enter_critical_bh(&mpath->state_lock);
mpath->flags |= RTW_MESH_PATH_RESOLVING | RTW_MESH_PATH_DELETED;
rtw_mesh_gate_del(tbl, mpath);
exit_critical_bh(&mpath->state_lock);
_cancel_timer_ex(&mpath->timer);
ATOMIC_DEC(&adapter->mesh_info.mpaths);
ATOMIC_DEC(&tbl->entries);
_rtw_spinlock_free(&mpath->state_lock);
rtw_mesh_path_flush_pending(mpath);
rtw_mpath_free_rcu(mpath);
}
static void __rtw_mesh_path_del(struct rtw_mesh_table *tbl, struct rtw_mesh_path *mpath)
{
rtw_rhashtable_remove_fast(&tbl->rhead, &mpath->rhash, rtw_mesh_rht_params);
rtw_mesh_path_free_rcu(tbl, mpath);
}
/**
* rtw_mesh_path_flush_by_nexthop - Deletes mesh paths if their next hop matches
*
* @sta: mesh peer to match
*
* RCU notes: this function is called when a mesh plink transitions from
* PLINK_ESTAB to any other state, since PLINK_ESTAB state is the only one that
* allows path creation. This will happen before the sta can be freed (because
* sta_info_destroy() calls this) so any reader in a rcu read block will be
* protected against the plink disappearing.
*/
void rtw_mesh_path_flush_by_nexthop(struct sta_info *sta)
{
_adapter *adapter = sta->padapter;
struct rtw_mesh_table *tbl = adapter->mesh_info.mesh_paths;
struct rtw_mesh_path *mpath;
rtw_rhashtable_iter iter;
int ret;
if (!tbl)
return;
ret = rtw_rhashtable_walk_enter(&tbl->rhead, &iter);
if (ret)
return;
ret = rtw_rhashtable_walk_start(&iter);
if (ret && ret != -EAGAIN)
goto out;
while ((mpath = rtw_rhashtable_walk_next(&iter))) {
if (IS_ERR(mpath) && PTR_ERR(mpath) == -EAGAIN)
continue;
if (IS_ERR(mpath))
break;
if (rtw_rcu_access_pointer(mpath->next_hop) == sta)
__rtw_mesh_path_del(tbl, mpath);
}
out:
rtw_rhashtable_walk_stop(&iter);
rtw_rhashtable_walk_exit(&iter);
}
static void rtw_mpp_flush_by_proxy(_adapter *adapter,
const u8 *proxy)
{
struct rtw_mesh_table *tbl = adapter->mesh_info.mpp_paths;
struct rtw_mesh_path *mpath;
rtw_rhashtable_iter iter;
int ret;
if (!tbl)
return;
ret = rtw_rhashtable_walk_enter(&tbl->rhead, &iter);
if (ret)
return;
ret = rtw_rhashtable_walk_start(&iter);
if (ret && ret != -EAGAIN)
goto out;
while ((mpath = rtw_rhashtable_walk_next(&iter))) {
if (IS_ERR(mpath) && PTR_ERR(mpath) == -EAGAIN)
continue;
if (IS_ERR(mpath))
break;
if (_rtw_memcmp(mpath->mpp, proxy, ETH_ALEN) == _TRUE)
__rtw_mesh_path_del(tbl, mpath);
}
out:
rtw_rhashtable_walk_stop(&iter);
rtw_rhashtable_walk_exit(&iter);
}
static void rtw_table_flush_by_iface(struct rtw_mesh_table *tbl)
{
struct rtw_mesh_path *mpath;
rtw_rhashtable_iter iter;
int ret;
if (!tbl)
return;
ret = rtw_rhashtable_walk_enter(&tbl->rhead, &iter);
if (ret)
return;
ret = rtw_rhashtable_walk_start(&iter);
if (ret && ret != -EAGAIN)
goto out;
while ((mpath = rtw_rhashtable_walk_next(&iter))) {
if (IS_ERR(mpath) && PTR_ERR(mpath) == -EAGAIN)
continue;
if (IS_ERR(mpath))
break;
__rtw_mesh_path_del(tbl, mpath);
}
out:
rtw_rhashtable_walk_stop(&iter);
rtw_rhashtable_walk_exit(&iter);
}
/**
* rtw_mesh_path_flush_by_iface - Deletes all mesh paths associated with a given iface
*
* This function deletes both mesh paths as well as mesh portal paths.
*
* @sdata: interface data to match
*
*/
void rtw_mesh_path_flush_by_iface(_adapter *adapter)
{
rtw_table_flush_by_iface(adapter->mesh_info.mesh_paths);
rtw_table_flush_by_iface(adapter->mesh_info.mpp_paths);
}
/**
* rtw_table_path_del - delete a path from the mesh or mpp table
*
* @tbl: mesh or mpp path table
* @sdata: local subif
* @addr: dst address (ETH_ALEN length)
*
* Returns: 0 if successful
*/
static int rtw_table_path_del(struct rtw_mesh_table *tbl,
const u8 *addr)
{
struct rtw_mesh_path *mpath;
if (!tbl)
return -ENXIO;
rtw_rcu_read_lock();
mpath = rtw_rhashtable_lookup_fast(&tbl->rhead, addr, rtw_mesh_rht_params);
if (!mpath) {
rtw_rcu_read_unlock();
return -ENXIO;
}
__rtw_mesh_path_del(tbl, mpath);
rtw_rcu_read_unlock();
return 0;
}
/**
* rtw_mesh_path_del - delete a mesh path from the table
*
* @addr: dst address (ETH_ALEN length)
* @sdata: local subif
*
* Returns: 0 if successful
*/
int rtw_mesh_path_del(_adapter *adapter, const u8 *addr)
{
int err;
/* flush relevant mpp entries first */
rtw_mpp_flush_by_proxy(adapter, addr);
err = rtw_table_path_del(adapter->mesh_info.mesh_paths, addr);
adapter->mesh_info.mesh_paths_generation++;
return err;
}
/**
* rtw_mesh_path_tx_pending - sends pending frames in a mesh path queue
*
* @mpath: mesh path to activate
*
* Locking: the state_lock of the mpath structure must NOT be held when calling
* this function.
*/
void rtw_mesh_path_tx_pending(struct rtw_mesh_path *mpath)
{
if (mpath->flags & RTW_MESH_PATH_ACTIVE) {
struct rtw_mesh_info *minfo = &mpath->adapter->mesh_info;
_list q;
u32 q_len = 0;
_rtw_init_listhead(&q);
/* move to local queue */
enter_critical_bh(&mpath->frame_queue.lock);
if (mpath->frame_queue_len) {
rtw_list_splice_init(&mpath->frame_queue.queue, &q);
q_len = mpath->frame_queue_len;
mpath->frame_queue_len = 0;
}
exit_critical_bh(&mpath->frame_queue.lock);
if (q_len) {
/* move to mpath_tx_queue */
enter_critical_bh(&minfo->mpath_tx_queue.lock);
rtw_list_splice_tail(&q, &minfo->mpath_tx_queue.queue);
minfo->mpath_tx_queue_len += q_len;
exit_critical_bh(&minfo->mpath_tx_queue.lock);
/* schedule mpath_tx_tasklet */
tasklet_hi_schedule(&minfo->mpath_tx_tasklet);
}
}
}
/**
* rtw_mesh_path_send_to_gates - sends pending frames to all known mesh gates
*
* @mpath: mesh path whose queue will be emptied
*
* If there is only one gate, the frames are transferred from the failed mpath
* queue to that gate's queue. If there are more than one gates, the frames
* are copied from each gate to the next. After frames are copied, the
* mpath queues are emptied onto the transmission queue.
*/
int rtw_mesh_path_send_to_gates(struct rtw_mesh_path *mpath)
{
_adapter *adapter = mpath->adapter;
struct rtw_mesh_table *tbl;
struct rtw_mesh_path *from_mpath = mpath;
struct rtw_mesh_path *gate;
bool copy = false;
rtw_hlist_node *node;
tbl = adapter->mesh_info.mesh_paths;
if (!tbl)
return 0;
rtw_rcu_read_lock();
rtw_hlist_for_each_entry_rcu(gate, node, &tbl->known_gates, gate_list) {
if (gate->flags & RTW_MESH_PATH_ACTIVE) {
RTW_MPATH_DBG(FUNC_ADPT_FMT" Forwarding to %pM\n",
FUNC_ADPT_ARG(adapter), gate->dst);
rtw_mesh_path_move_to_queue(gate, from_mpath, copy);
from_mpath = gate;
copy = true;
} else {
RTW_MPATH_DBG(
FUNC_ADPT_FMT" Not forwarding to %pM (flags %#x)\n",
FUNC_ADPT_ARG(adapter), gate->dst, gate->flags);
}
}
rtw_hlist_for_each_entry_rcu(gate, node, &tbl->known_gates, gate_list) {
RTW_MPATH_DBG(FUNC_ADPT_FMT" Sending to %pM\n",
FUNC_ADPT_ARG(adapter), gate->dst);
rtw_mesh_path_tx_pending(gate);
}
rtw_rcu_read_unlock();
return (from_mpath == mpath) ? -EHOSTUNREACH : 0;
}
/**
* rtw_mesh_path_discard_frame - discard a frame whose path could not be resolved
*
* @skb: frame to discard
* @sdata: network subif the frame was to be sent through
*
* Locking: the function must me called within a rcu_read_lock region
*/
void rtw_mesh_path_discard_frame(_adapter *adapter,
struct xmit_frame *xframe)
{
rtw_free_xmitframe(&adapter->xmitpriv, xframe);
adapter->mesh_info.mshstats.dropped_frames_no_route++;
}
/**
* rtw_mesh_path_flush_pending - free the pending queue of a mesh path
*
* @mpath: mesh path whose queue has to be freed
*
* Locking: the function must me called within a rcu_read_lock region
*/
void rtw_mesh_path_flush_pending(struct rtw_mesh_path *mpath)
{
struct xmit_frame *xframe;
_list *list, *head;
_list tmp;
_rtw_init_listhead(&tmp);
enter_critical_bh(&mpath->frame_queue.lock);
rtw_list_splice_init(&mpath->frame_queue.queue, &tmp);
mpath->frame_queue_len = 0;
exit_critical_bh(&mpath->frame_queue.lock);
head = &tmp;
list = get_next(head);
while (rtw_end_of_queue_search(head, list) == _FALSE) {
xframe = LIST_CONTAINOR(list, struct xmit_frame, list);
list = get_next(list);
rtw_list_delete(&xframe->list);
rtw_mesh_path_discard_frame(mpath->adapter, xframe);
}
}
/**
* rtw_mesh_path_fix_nexthop - force a specific next hop for a mesh path
*
* @mpath: the mesh path to modify
* @next_hop: the next hop to force
*
* Locking: this function must be called holding mpath->state_lock
*/
void rtw_mesh_path_fix_nexthop(struct rtw_mesh_path *mpath, struct sta_info *next_hop)
{
enter_critical_bh(&mpath->state_lock);
rtw_mesh_path_assign_nexthop(mpath, next_hop);
mpath->sn = 0xffff;
mpath->metric = 0;
mpath->hop_count = 0;
mpath->exp_time = 0;
mpath->flags = RTW_MESH_PATH_FIXED | RTW_MESH_PATH_SN_VALID;
rtw_mesh_path_activate(mpath);
exit_critical_bh(&mpath->state_lock);
rtw_ewma_err_rate_init(&next_hop->metrics.err_rate);
/* init it at a low value - 0 start is tricky */
rtw_ewma_err_rate_add(&next_hop->metrics.err_rate, 1);
rtw_mesh_path_tx_pending(mpath);
}
int rtw_mesh_pathtbl_init(_adapter *adapter)
{
struct rtw_mesh_table *tbl_path, *tbl_mpp;
int ret;
tbl_path = rtw_mesh_table_alloc();
if (!tbl_path)
return -ENOMEM;
tbl_mpp = rtw_mesh_table_alloc();
if (!tbl_mpp) {
ret = -ENOMEM;
goto free_path;
}
rtw_rhashtable_init(&tbl_path->rhead, &rtw_mesh_rht_params);
rtw_rhashtable_init(&tbl_mpp->rhead, &rtw_mesh_rht_params);
adapter->mesh_info.mesh_paths = tbl_path;
adapter->mesh_info.mpp_paths = tbl_mpp;
return 0;
free_path:
rtw_mesh_table_free(tbl_path);
return ret;
}
static
void rtw_mesh_path_tbl_expire(_adapter *adapter,
struct rtw_mesh_table *tbl)
{
struct rtw_mesh_path *mpath;
rtw_rhashtable_iter iter;
int ret;
if (!tbl)
return;
ret = rtw_rhashtable_walk_enter(&tbl->rhead, &iter);
if (ret)
return;
ret = rtw_rhashtable_walk_start(&iter);
if (ret && ret != -EAGAIN)
goto out;
while ((mpath = rtw_rhashtable_walk_next(&iter))) {
if (IS_ERR(mpath) && PTR_ERR(mpath) == -EAGAIN)
continue;
if (IS_ERR(mpath))
break;
if ((!(mpath->flags & RTW_MESH_PATH_RESOLVING)) &&
(!(mpath->flags & RTW_MESH_PATH_FIXED)) &&
rtw_time_after(rtw_get_current_time(), mpath->exp_time + RTW_MESH_PATH_EXPIRE))
__rtw_mesh_path_del(tbl, mpath);
if (mpath->is_gate && /* need not to deal with non-gate case */
rtw_time_after(rtw_get_current_time(), mpath->gate_timeout)) {
RTW_MPATH_DBG(FUNC_ADPT_FMT"mpath [%pM] expired systime is %lu systime is %lu\n",
FUNC_ADPT_ARG(adapter), mpath->dst,
mpath->gate_timeout, rtw_get_current_time());
enter_critical_bh(&mpath->state_lock);
if (mpath->gate_asked) { /* asked gate before */
rtw_mesh_gate_del(tbl, mpath);
exit_critical_bh(&mpath->state_lock);
} else {
mpath->gate_asked = true;
mpath->gate_timeout = rtw_get_current_time() + rtw_ms_to_systime(mpath->gate_ann_int);
exit_critical_bh(&mpath->state_lock);
rtw_mesh_queue_preq(mpath, RTW_PREQ_Q_F_START | RTW_PREQ_Q_F_REFRESH);
RTW_MPATH_DBG(FUNC_ADPT_FMT"mpath [%pM] ask mesh gate existence (is_root=%d)\n",
FUNC_ADPT_ARG(adapter), mpath->dst, mpath->is_root);
}
}
}
out:
rtw_rhashtable_walk_stop(&iter);
rtw_rhashtable_walk_exit(&iter);
}
void rtw_mesh_path_expire(_adapter *adapter)
{
rtw_mesh_path_tbl_expire(adapter, adapter->mesh_info.mesh_paths);
rtw_mesh_path_tbl_expire(adapter, adapter->mesh_info.mpp_paths);
}
void rtw_mesh_pathtbl_unregister(_adapter *adapter)
{
if (adapter->mesh_info.mesh_paths) {
rtw_mesh_table_free(adapter->mesh_info.mesh_paths);
adapter->mesh_info.mesh_paths = NULL;
}
if (adapter->mesh_info.mpp_paths) {
rtw_mesh_table_free(adapter->mesh_info.mpp_paths);
adapter->mesh_info.mpp_paths = NULL;
}
}
#endif /* CONFIG_RTW_MESH */
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