From: Andreas Fenkart <andreas.fenkart@xxxxxxxxxxxxxxxxxxx>
Rotate bss prio list, so the bss next to the one served, will come first
in the list of bss' with equal priority. This way we pick bss nodes in a
round robin fashion. Using list rotation instead of a cur ptr simplifies
iteration to calling list_for_each_entry. List rotation is done via
list_move, where the head itself is temporarily removed and then
re-inserted after the bss just served.
Signed-off-by: Andreas Fenkart <andreas.fenkart@xxxxxxxxxxxxxxxxxxx>
Acked-by: Bing Zhao <bzhao@xxxxxxxxxxx>
---
drivers/net/wireless/mwifiex/11n_aggr.c | 6 --
drivers/net/wireless/mwifiex/init.c | 21 ++------
drivers/net/wireless/mwifiex/wmm.c | 79 +++++++++----------------------
3 files changed, 29 insertions(+), 77 deletions(-)
diff --git a/drivers/net/wireless/mwifiex/11n_aggr.c b/drivers/net/wireless/mwifiex/11n_aggr.c
index c6d7451..a78e065 100644
--- a/drivers/net/wireless/mwifiex/11n_aggr.c
+++ b/drivers/net/wireless/mwifiex/11n_aggr.c
@@ -297,12 +297,6 @@ mwifiex_11n_aggregate_pkt(struct mwifiex_private *priv,
}
if (ret != -EBUSY) {
mwifiex_rotate_priolists(priv, pra_list, ptrindex);
- /* Now bss_prio_cur pointer points to next node */
- adapter->bss_prio_tbl[priv->bss_priority].bss_prio_cur =
- list_first_entry(
- &adapter->bss_prio_tbl[priv->bss_priority]
- .bss_prio_cur->list,
- struct mwifiex_bss_prio_node, list);
}
return 0;
diff --git a/drivers/net/wireless/mwifiex/init.c b/drivers/net/wireless/mwifiex/init.c
index 42d7f0a..9f44fda 100644
--- a/drivers/net/wireless/mwifiex/init.c
+++ b/drivers/net/wireless/mwifiex/init.c
@@ -44,8 +44,6 @@ static int mwifiex_add_bss_prio_tbl(struct mwifiex_private *priv)
bss_prio->priv = priv;
INIT_LIST_HEAD(&bss_prio->list);
- if (!tbl[priv->bss_priority].bss_prio_cur)
- tbl[priv->bss_priority].bss_prio_cur = bss_prio;
spin_lock_irqsave(&tbl[priv->bss_priority].bss_prio_lock, flags);
list_add_tail(&bss_prio->list, &tbl[priv->bss_priority].bss_prio_head);
@@ -525,7 +523,6 @@ int mwifiex_init_lock_list(struct mwifiex_adapter *adapter)
for (i = 0; i < adapter->priv_num; ++i) {
INIT_LIST_HEAD(&adapter->bss_prio_tbl[i].bss_prio_head);
- adapter->bss_prio_tbl[i].bss_prio_cur = NULL;
spin_lock_init(&adapter->bss_prio_tbl[i].bss_prio_lock);
}
@@ -625,42 +622,36 @@ static void mwifiex_delete_bss_prio_tbl(struct mwifiex_private *priv)
{
int i;
struct mwifiex_adapter *adapter = priv->adapter;
- struct mwifiex_bss_prio_node *bssprio_node, *tmp_node, **cur;
+ struct mwifiex_bss_prio_node *bssprio_node, *tmp_node;
struct list_head *head;
spinlock_t *lock; /* bss priority lock */
unsigned long flags;
for (i = 0; i < adapter->priv_num; ++i) {
head = &adapter->bss_prio_tbl[i].bss_prio_head;
- cur = &adapter->bss_prio_tbl[i].bss_prio_cur;
lock = &adapter->bss_prio_tbl[i].bss_prio_lock;
dev_dbg(adapter->dev, "info: delete BSS priority table,"
" bss_type = %d, bss_num = %d, i = %d,"
- " head = %p, cur = %p\n",
- priv->bss_type, priv->bss_num, i, head, *cur);
- if (*cur) {
+ " head = %p\n",
+ priv->bss_type, priv->bss_num, i, head);
+
+ {
spin_lock_irqsave(lock, flags);
if (list_empty(head)) {
spin_unlock_irqrestore(lock, flags);
continue;
}
- bssprio_node = list_first_entry(head,
- struct mwifiex_bss_prio_node, list);
- spin_unlock_irqrestore(lock, flags);
-
list_for_each_entry_safe(bssprio_node, tmp_node, head,
list) {
if (bssprio_node->priv == priv) {
dev_dbg(adapter->dev, "info: Delete "
"node %p, next = %p\n",
bssprio_node, tmp_node);
- spin_lock_irqsave(lock, flags);
list_del(&bssprio_node->list);
- spin_unlock_irqrestore(lock, flags);
kfree(bssprio_node);
}
}
- *cur = (struct mwifiex_bss_prio_node *)head;
+ spin_unlock_irqrestore(lock, flags);
}
}
}
diff --git a/drivers/net/wireless/mwifiex/wmm.c b/drivers/net/wireless/mwifiex/wmm.c
index b48e03c..4be3d33 100644
--- a/drivers/net/wireless/mwifiex/wmm.c
+++ b/drivers/net/wireless/mwifiex/wmm.c
@@ -878,37 +878,25 @@ mwifiex_wmm_get_highest_priolist_ptr(struct mwifiex_adapter *adapter,
{
struct mwifiex_private *priv_tmp;
struct mwifiex_ra_list_tbl *ptr;
- struct mwifiex_bss_prio_node *bssprio_node, *bssprio_head;
struct mwifiex_tid_tbl *tid_ptr;
atomic_t *hqp;
unsigned long flags_bss, flags_ra;
int i, j;
+ /* check the BSS with highest priority first */
for (j = adapter->priv_num - 1; j >= 0; --j) {
spin_lock_irqsave(&adapter->bss_prio_tbl[j].bss_prio_lock,
flags_bss);
- if (list_empty(&adapter->bss_prio_tbl[j].bss_prio_head))
- goto skip_prio_tbl;
-
- if (adapter->bss_prio_tbl[j].bss_prio_cur ==
- (struct mwifiex_bss_prio_node *)
- &adapter->bss_prio_tbl[j].bss_prio_head) {
- adapter->bss_prio_tbl[j].bss_prio_cur =
- list_first_entry(&adapter->bss_prio_tbl[j]
- .bss_prio_head,
- struct mwifiex_bss_prio_node,
- list);
- }
-
- bssprio_node = adapter->bss_prio_tbl[j].bss_prio_cur;
- bssprio_head = bssprio_node;
+ /* iterate over BSS with the equal priority */
+ list_for_each_entry(adapter->bss_prio_tbl[j].bss_prio_cur,
+ &adapter->bss_prio_tbl[j].bss_prio_head,
+ list) {
- do {
- priv_tmp = bssprio_node->priv;
+ priv_tmp = adapter->bss_prio_tbl[j].bss_prio_cur->priv;
if (atomic_read(&priv_tmp->wmm.tx_pkts_queued) == 0)
- goto skip_bss;
+ continue;
/* iterate over the WMM queues of the BSS */
hqp = &priv_tmp->wmm.highest_queued_prio;
@@ -933,24 +921,8 @@ mwifiex_wmm_get_highest_priolist_ptr(struct mwifiex_adapter *adapter,
ra_list_spinlock,
flags_ra);
}
+ }
-skip_bss:
- /* Get next bss priority node */
- bssprio_node = list_first_entry(&bssprio_node->list,
- struct mwifiex_bss_prio_node,
- list);
-
- if (bssprio_node ==
- (struct mwifiex_bss_prio_node *)
- &adapter->bss_prio_tbl[j].bss_prio_head)
- /* Get next bss priority node */
- bssprio_node = list_first_entry(
- &bssprio_node->list,
- struct mwifiex_bss_prio_node,
- list);
- } while (bssprio_node != bssprio_head);
-
-skip_prio_tbl:
spin_unlock_irqrestore(&adapter->bss_prio_tbl[j].bss_prio_lock,
flags_bss);
}
@@ -971,12 +943,12 @@ found:
return ptr;
}
-/* This functions rotates ra lists so packets are picked in round robin
- * fashion.
+/* This functions rotates ra and bss lists so packets are picked round robin.
*
* After a packet is successfully transmitted, rotate the ra list, so the ra
* next to the one transmitted, will come first in the list. This way we pick
- * the ra in a round robin fashion.
+ * the ra' in a round robin fashion. Same applies to bss nodes of equal
+ * priority.
*
* Function also increments wmm.packets_out counter.
*/
@@ -984,17 +956,24 @@ void mwifiex_rotate_priolists(struct mwifiex_private *priv,
struct mwifiex_ra_list_tbl *ra,
int tid)
{
+ struct mwifiex_adapter *adapter = priv->adapter;
+ struct mwifiex_bss_prio_tbl *tbl = adapter->bss_prio_tbl;
struct mwifiex_tid_tbl *tid_ptr = &priv->wmm.tid_tbl_ptr[tid];
unsigned long flags;
+ spin_lock_irqsave(&tbl[priv->bss_priority].bss_prio_lock, flags);
+ /*
+ * dirty trick: we remove 'head' temporarily and reinsert it after
+ * curr bss node. imagine list to stay fixed while head is moved
+ */
+ list_move(&tbl[priv->bss_priority].bss_prio_head,
+ &tbl[priv->bss_priority].bss_prio_cur->list);
+ spin_unlock_irqrestore(&tbl[priv->bss_priority].bss_prio_lock, flags);
+
spin_lock_irqsave(&priv->wmm.ra_list_spinlock, flags);
if (mwifiex_is_ralist_valid(priv, ra, tid)) {
priv->wmm.packets_out[tid]++;
- /*
- * dirty trick: we remove 'head' temporarily and reinsert it
- * after curr bss node. imagine list to stay fixed while only
- * head is moved
- */
+ /* same as above */
list_move(&tid_ptr->ra_list, &ra->list);
}
spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock, flags);
@@ -1087,12 +1066,6 @@ mwifiex_send_single_packet(struct mwifiex_private *priv,
ra_list_flags);
} else {
mwifiex_rotate_priolists(priv, ptr, ptr_index);
- adapter->bss_prio_tbl[priv->bss_priority].bss_prio_cur =
- list_first_entry(
- &adapter->bss_prio_tbl[priv->bss_priority]
- .bss_prio_cur->list,
- struct mwifiex_bss_prio_node,
- list);
atomic_dec(&priv->wmm.tx_pkts_queued);
}
}
@@ -1198,12 +1171,6 @@ mwifiex_send_processed_packet(struct mwifiex_private *priv,
}
if (ret != -EBUSY) {
mwifiex_rotate_priolists(priv, ptr, ptr_index);
- adapter->bss_prio_tbl[priv->bss_priority].bss_prio_cur =
- list_first_entry(
- &adapter->bss_prio_tbl[priv->bss_priority]
- .bss_prio_cur->list,
- struct mwifiex_bss_prio_node,
- list);
atomic_dec(&priv->wmm.tx_pkts_queued);
}
}
--
1.7.0.2
--
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