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Bluetooth: L2CAP: Add dedicated pool for disconnect request

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This prevents disconnect request packets to not being sent due to lack
of buffers normally caused by flooding or congestion.

Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>
This commit is contained in:
Luiz Augusto von Dentz 2019-11-18 13:46:12 +02:00 • committed by Johan Hedberg
commit 5d26693d02
1 changed files with 12 additions and 1 deletions
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13
subsys/bluetooth/host/l2cap.c
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@ -50,6 +50,12 @@
#define L2CAP_CONN_TIMEOUT K_SECONDS(40) #define L2CAP_CONN_TIMEOUT K_SECONDS(40)
#define L2CAP_DISC_TIMEOUT K_SECONDS(2) #define L2CAP_DISC_TIMEOUT K_SECONDS(2)
/* Dedicated pool for disconnect buffers so they are guaranteed to be send
* even in case of data congestion due to flooding.
*/
NET_BUF_POOL_FIXED_DEFINE(disc_pool, 1,
BT_L2CAP_BUF_SIZE(CONFIG_BT_L2CAP_TX_MTU), NULL);
#if defined(CONFIG_BT_L2CAP_DYNAMIC_CHANNEL) #if defined(CONFIG_BT_L2CAP_DYNAMIC_CHANNEL)
/* Size of MTU is based on the maximum amount of data the buffer can hold /* Size of MTU is based on the maximum amount of data the buffer can hold
* excluding ACL and driver headers. * excluding ACL and driver headers.
@ -376,9 +382,14 @@ static struct net_buf *l2cap_create_le_sig_pdu(struct net_buf *buf,
u16_t len) u16_t len)
{ {
struct bt_l2cap_sig_hdr *hdr; struct bt_l2cap_sig_hdr *hdr;
struct net_buf_pool *pool = NULL;
if (code == BT_L2CAP_DISCONN_REQ) {
pool = &disc_pool;
}
/* Don't wait more than the minimum RTX timeout of 2 seconds */ /* Don't wait more than the minimum RTX timeout of 2 seconds */
buf = bt_l2cap_create_pdu_timeout(NULL, 0, K_SECONDS(2)); buf = bt_l2cap_create_pdu_timeout(pool, 0, K_SECONDS(2));
if (!buf) { if (!buf) {
/* If it was not possible to allocate a buffer within the /* If it was not possible to allocate a buffer within the
* timeout return NULL. * timeout return NULL.