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Bluetooth: Move ACL fragmentation from bt_conn_send to tx fiber

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This way we're both able to properly utilize the fragments pool as
well as ensure that no two buffers for this connection end up being
fragmented into the tx_queue in an interleaved fashion (which would
just confuse the controller).

Change-Id: I3934cd3fbfc5e190d61475eb691a34a2df13ed74
Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>
This commit is contained in:
Johan Hedberg 2015-11-05 22:11:44 +02:00 • committed by Anas Nashif
commit 7a39d44577
1 changed files with 89 additions and 51 deletions
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160
net/bluetooth/conn.c
View file

@ -44,8 +44,8 @@
#endif
/* Pool for outgoing ACL fragments */
static struct nano_fifo frag;
static NET_BUF_POOL(frag_pool, 1, BT_L2CAP_BUF_SIZE(23), &frag, NULL, 0);
static struct nano_fifo frag_buf;
static NET_BUF_POOL(frag_pool, 1, BT_L2CAP_BUF_SIZE(23), &frag_buf, NULL, 0);
/* Pool for dummy buffers to wake up the tx fibers */
static struct nano_fifo dummy;
@ -323,11 +323,6 @@ void bt_conn_recv(struct bt_conn *conn, struct net_buf *buf, uint8_t flags)
void bt_conn_send(struct bt_conn *conn, struct net_buf *buf)
{
uint16_t len, remaining = buf->len;
struct bt_hci_acl_hdr *hdr;
struct nano_fifo frags;
uint8_t *ptr;
BT_DBG("conn handle %u buf len %u\n", conn->handle, buf->len);
if (conn->state != BT_CONN_CONNECTED) {
@ -336,42 +331,104 @@ void bt_conn_send(struct bt_conn *conn, struct net_buf *buf)
return;
}
nano_fifo_init(&frags);
len = min(remaining, bt_dev.le.mtu);
hdr = net_buf_push(buf, sizeof(*hdr));
hdr->handle = sys_cpu_to_le16(bt_acl_handle_pack(conn->handle,
BT_ACL_START_NO_FLUSH));
hdr->len = sys_cpu_to_le16(len);
buf->len -= remaining - len;
ptr = net_buf_tail(buf);
nano_fifo_put(&frags, buf);
remaining -= len;
while (remaining) {
buf = bt_conn_create_pdu(&frag, 0);
len = min(remaining, bt_dev.le.mtu);
/* Copy from original buffer */
memcpy(net_buf_add(buf, len), ptr, len);
ptr += len;
hdr = net_buf_push(buf, sizeof(*hdr));
hdr->handle = sys_cpu_to_le16(bt_acl_handle_pack(conn->handle,
BT_ACL_CONT));
hdr->len = sys_cpu_to_le16(len);
nano_fifo_put(&frags, buf);
remaining -= len;
}
while ((buf = nano_fifo_get(&frags))) {
nano_fifo_put(&conn->tx_queue, buf);
}
static bool send_frag(struct bt_conn *conn, struct net_buf *buf, uint8_t flags)
{
struct bt_hci_acl_hdr *hdr;
int err;
BT_DBG("conn %p buf %p len %u flags 0x%02x\n", conn, buf, buf->len,
flags);
/* Wait until the controller can accept ACL packets */
nano_fiber_sem_take_wait(&bt_dev.le.pkts_sem);
/* Check for disconnection while waiting for pkts_sem */
if (conn->state != BT_CONN_CONNECTED) {
nano_fiber_sem_give(&bt_dev.le.pkts_sem);
net_buf_unref(buf);
return false;
}
hdr = net_buf_push(buf, sizeof(*hdr));
hdr->handle = sys_cpu_to_le16(bt_acl_handle_pack(conn->handle, flags));
hdr->len = sys_cpu_to_le16(buf->len - sizeof(*hdr));
BT_DBG("passing buf %p len %u to driver\n", buf, buf->len);
err = bt_dev.drv->send(BT_ACL_OUT, buf);
if (err) {
BT_ERR("Unable to send to driver (err %d)\n", err);
nano_fiber_sem_give(&bt_dev.le.pkts_sem);
net_buf_unref(buf);
} else {
conn->pending_pkts++;
}
return true;
}
static struct net_buf *create_frag(struct bt_conn *conn)
{
struct net_buf *buf;
buf = bt_l2cap_create_pdu(&frag_buf);
if (conn->state != BT_CONN_CONNECTED) {
if (buf) {
net_buf_unref(buf);
}
return NULL;
}
return buf;
}
static bool send_buf(struct bt_conn *conn, struct net_buf *buf)
{
struct net_buf *frag;
BT_DBG("conn %p buf %p len %u\n", conn, buf, buf->len);
/* Send directly if the packet fits the ACL MTU */
if (buf->len <= bt_dev.le.mtu) {
return send_frag(conn, buf, BT_ACL_START_NO_FLUSH);
}
/* Create & enqueue first fragment */
frag = create_frag(conn);
if (!frag) {
return false;
}
memcpy(net_buf_add(frag, bt_dev.le.mtu), buf->data, bt_dev.le.mtu);
net_buf_pull(buf, bt_dev.le.mtu);
if (!send_frag(conn, frag, BT_ACL_START_NO_FLUSH)) {
return false;
}
/*
* Send the fragments. For the last one simply use the original
* buffer (which works since we've used net_buf_pull on it.
*/
while (buf->len > bt_dev.le.mtu) {
frag = create_frag(conn);
if (!frag) {
return false;
}
/* Copy from original buffer */
memcpy(net_buf_add(frag, bt_dev.le.mtu), buf->data,
bt_dev.le.mtu);
net_buf_pull(buf, bt_dev.le.mtu);
if (!send_frag(conn, frag, BT_ACL_CONT)) {
return false;
}
}
return send_frag(conn, buf, BT_ACL_CONT);
}
static void conn_tx_fiber(int arg1, int arg2)
@ -382,34 +439,15 @@ static void conn_tx_fiber(int arg1, int arg2)
BT_DBG("Started for handle %u\n", conn->handle);
while (conn->state == BT_CONN_CONNECTED) {
int err;
/* Wait until the controller can accept ACL packets */
BT_DBG("calling sem_take_wait\n");
nano_fiber_sem_take_wait(&bt_dev.le.pkts_sem);
/* check for disconnection */
if (conn->state != BT_CONN_CONNECTED) {
nano_fiber_sem_give(&bt_dev.le.pkts_sem);
break;
}
/* Get next ACL packet for connection */
buf = nano_fifo_get_wait(&conn->tx_queue);
if (conn->state != BT_CONN_CONNECTED) {
nano_fiber_sem_give(&bt_dev.le.pkts_sem);
net_buf_unref(buf);
break;
}
BT_DBG("passing buf %p len %u to driver\n", buf, buf->len);
err = bt_dev.drv->send(BT_ACL_OUT, buf);
if (err) {
BT_ERR("Unable to send to driver (err %d)\n", err);
nano_fiber_sem_give(&bt_dev.le.pkts_sem);
if (!send_buf(conn, buf)) {
net_buf_unref(buf);
} else {
conn->pending_pkts++;
}
}