Bluetooth: make use of connection number to optimize the scheduler

This checks if there is any existing connection according to its type
before start iterating in the list and immediately stop iterating when
reaching the number of connections.

Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>
Signed-off-by: Gustavo F. Padovan <padovan@profusion.mobi>

diff --git a/include/net/bluetooth/hci_core.h b/include/net/bluetooth/hci_core.h
index 8f441b8b2963d685330d8981263b5d8454a0acb5..e2ba4d6b4190d24abda77a640aedb8878d042356 100644 (file)
--- a/include/net/bluetooth/hci_core.h
+++ b/include/net/bluetooth/hci_core.h
@@ -395,6 +395,22 @@ static inline void hci_conn_hash_del(struct hci_dev *hdev, struct hci_conn *c)
        }
 }
 
+static inline unsigned int hci_conn_num(struct hci_dev *hdev, __u8 type)
+{
+       struct hci_conn_hash *h = &hdev->conn_hash;
+       switch (type) {
+       case ACL_LINK:
+               return h->acl_num;
+       case LE_LINK:
+               return h->le_num;
+       case SCO_LINK:
+       case ESCO_LINK:
+               return h->sco_num;
+       default:
+               return 0;
+       }
+}
+
 static inline struct hci_conn *hci_conn_hash_lookup_handle(struct hci_dev *hdev,
                                                                __u16 handle)
 {

diff --git a/net/bluetooth/hci_core.c b/net/bluetooth/hci_core.c
index 56943add45cc44707167f4877e27fe5630b00c95..1d2068322728a92a4c1b4735d895fc2891c1b773 100644 (file)
--- a/net/bluetooth/hci_core.c
+++ b/net/bluetooth/hci_core.c
@@ -2074,6 +2074,9 @@ static inline struct hci_conn *hci_low_sent(struct hci_dev *hdev, __u8 type, int
                        min  = c->sent;
                        conn = c;
                }
+
+               if (hci_conn_num(hdev, type) == num)
+                       break;
        }
 
        if (conn) {
@@ -2131,6 +2134,9 @@ static inline void hci_sched_acl(struct hci_dev *hdev)
 
        BT_DBG("%s", hdev->name);
 
+       if (!hci_conn_num(hdev, ACL_LINK))
+               return;
+
        if (!test_bit(HCI_RAW, &hdev->flags)) {
                /* ACL tx timeout must be longer than maximum
                 * link supervision timeout (40.9 seconds) */
@@ -2162,6 +2168,9 @@ static inline void hci_sched_sco(struct hci_dev *hdev)
 
        BT_DBG("%s", hdev->name);
 
+       if (!hci_conn_num(hdev, SCO_LINK))
+               return;
+
        while (hdev->sco_cnt && (conn = hci_low_sent(hdev, SCO_LINK, &quote))) {
                while (quote-- && (skb = skb_dequeue(&conn->data_q))) {
                        BT_DBG("skb %p len %d", skb, skb->len);
@@ -2182,6 +2191,9 @@ static inline void hci_sched_esco(struct hci_dev *hdev)
 
        BT_DBG("%s", hdev->name);
 
+       if (!hci_conn_num(hdev, ESCO_LINK))
+               return;
+
        while (hdev->sco_cnt && (conn = hci_low_sent(hdev, ESCO_LINK, &quote))) {
                while (quote-- && (skb = skb_dequeue(&conn->data_q))) {
                        BT_DBG("skb %p len %d", skb, skb->len);
@@ -2202,6 +2214,9 @@ static inline void hci_sched_le(struct hci_dev *hdev)
 
        BT_DBG("%s", hdev->name);
 
+       if (!hci_conn_num(hdev, LE_LINK))
+               return;
+
        if (!test_bit(HCI_RAW, &hdev->flags)) {
                /* LE tx timeout must be longer than maximum
                 * link supervision timeout (40.9 seconds) */