blob: 401084a93544e71d7926248bb9a8ed490a008097 [file] [log] [blame]
/******************************************************************************
*
* Copyright (C) 1999-2012 Broadcom Corporation
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
******************************************************************************/
/******************************************************************************
*
* this file contains the functions relating to link management. A "link"
* is a connection between this device and another device. Only ACL links
* are managed.
*
******************************************************************************/
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include "gki.h"
#include "bt_types.h"
#include "hcimsgs.h"
#include "l2cdefs.h"
#include "l2c_int.h"
#include "l2c_api.h"
#include "btu.h"
#include "btm_api.h"
#include "btm_int.h"
static BOOLEAN l2c_link_send_to_lower (tL2C_LCB *p_lcb, BT_HDR *p_buf);
#define L2C_LINK_SEND_ACL_DATA(x) HCI_ACL_DATA_TO_LOWER((x))
#if (BLE_INCLUDED == TRUE)
#define L2C_LINK_SEND_BLE_ACL_DATA(x) HCI_BLE_ACL_DATA_TO_LOWER((x))
#endif
/*******************************************************************************
**
** Function l2c_link_hci_conn_req
**
** Description This function is called when an HCI Connection Request
** event is received.
**
** Returns TRUE, if accept conn
**
*******************************************************************************/
BOOLEAN l2c_link_hci_conn_req (BD_ADDR bd_addr)
{
tL2C_LCB *p_lcb;
tL2C_LCB *p_lcb_cur;
int xx;
BOOLEAN no_links;
/* See if we have a link control block for the remote device */
p_lcb = l2cu_find_lcb_by_bd_addr (bd_addr);
/* If we don't have one, create one and accept the connection. */
if (!p_lcb)
{
p_lcb = l2cu_allocate_lcb (bd_addr, FALSE);
if (!p_lcb)
{
btsnd_hcic_reject_conn (bd_addr, HCI_ERR_HOST_REJECT_RESOURCES);
L2CAP_TRACE_ERROR0 ("L2CAP failed to allocate LCB");
return FALSE;
}
no_links = TRUE;
/* If we already have connection, accept as a master */
for (xx = 0, p_lcb_cur = &l2cb.lcb_pool[0]; xx < MAX_L2CAP_LINKS; xx++, p_lcb_cur++)
{
if (p_lcb_cur == p_lcb)
continue;
if (p_lcb_cur->in_use)
{
no_links = FALSE;
p_lcb->link_role = HCI_ROLE_MASTER;
break;
}
}
if (no_links)
{
if (!btm_dev_support_switch (bd_addr))
p_lcb->link_role = HCI_ROLE_SLAVE;
else
p_lcb->link_role = l2cu_get_conn_role(p_lcb);
}
/* Tell the other side we accept the connection */
btsnd_hcic_accept_conn (bd_addr, p_lcb->link_role);
p_lcb->link_state = LST_CONNECTING;
/* Start a timer waiting for connect complete */
btu_start_timer (&p_lcb->timer_entry, BTU_TTYPE_L2CAP_LINK, L2CAP_LINK_CONNECT_TOUT);
return (TRUE);
}
/* We already had a link control block to the guy. Check what state it is in */
if ((p_lcb->link_state == LST_CONNECTING) || (p_lcb->link_state == LST_CONNECT_HOLDING))
{
/* Connection collision. Accept the connection anyways. */
if (!btm_dev_support_switch (bd_addr))
p_lcb->link_role = HCI_ROLE_SLAVE;
else
p_lcb->link_role = l2cu_get_conn_role(p_lcb);
btsnd_hcic_accept_conn (bd_addr, p_lcb->link_role);
p_lcb->link_state = LST_CONNECTING;
return (TRUE);
}
else if (p_lcb->link_state == LST_DISCONNECTING)
{
/* In disconnecting state, reject the connection. */
btsnd_hcic_reject_conn (bd_addr, HCI_ERR_HOST_REJECT_DEVICE);
}
else
{
L2CAP_TRACE_ERROR0 ("L2CAP got conn_req while connected");
}
return (FALSE);
}
/*******************************************************************************
**
** Function l2c_link_hci_conn_comp
**
** Description This function is called when an HCI Connection Complete
** event is received.
**
** Returns void
**
*******************************************************************************/
BOOLEAN l2c_link_hci_conn_comp (UINT8 status, UINT16 handle, BD_ADDR p_bda)
{
tL2C_CONN_INFO ci;
tL2C_LCB *p_lcb;
tL2C_CCB *p_ccb;
tBTM_SEC_DEV_REC *p_dev_info = NULL;
#if (defined(BTM_BUSY_LEVEL_CHANGE_INCLUDED) && BTM_BUSY_LEVEL_CHANGE_INCLUDED == TRUE)
btm_acl_update_busy_level (BTM_BLI_PAGE_DONE_EVT);
#endif
/* Save the parameters */
ci.status = status;
memcpy (ci.bd_addr, p_bda, BD_ADDR_LEN);
/* See if we have a link control block for the remote device */
p_lcb = l2cu_find_lcb_by_bd_addr (ci.bd_addr);
/* If we don't have one, this is an error */
if (!p_lcb)
{
L2CAP_TRACE_WARNING0 ("L2CAP got conn_comp for unknown BD_ADDR");
return (FALSE);
}
if (p_lcb->link_state != LST_CONNECTING)
{
L2CAP_TRACE_ERROR2 ("L2CAP got conn_comp in bad state: %d status: 0x%d", p_lcb->link_state, status);
if (status != HCI_SUCCESS)
l2c_link_hci_disc_comp (p_lcb->handle, status);
return (FALSE);
}
/* Save the handle */
p_lcb->handle = handle;
if (ci.status == HCI_SUCCESS)
{
/* Connected OK. Change state to connected */
p_lcb->link_state = LST_CONNECTED;
/* Get the peer information if the l2cap flow-control/rtrans is supported */
l2cu_send_peer_info_req (p_lcb, L2CAP_EXTENDED_FEATURES_INFO_TYPE);
/* Tell BTM Acl management about the link */
if ((p_dev_info = btm_find_dev (p_bda)) != NULL)
btm_acl_created (ci.bd_addr, p_dev_info->dev_class,
p_dev_info->sec_bd_name, handle,
p_lcb->link_role, FALSE);
else
btm_acl_created (ci.bd_addr, NULL, NULL, handle, p_lcb->link_role, FALSE);
/* If dedicated bonding do not process any further */
if (p_lcb->is_bonding)
{
if (l2cu_start_post_bond_timer(handle))
return (TRUE);
}
/* Update the timeouts in the hold queue */
l2c_process_held_packets(FALSE);
btu_stop_timer (&p_lcb->timer_entry);
/* For all channels, send the event through their FSMs */
for (p_ccb = p_lcb->ccb_queue.p_first_ccb; p_ccb; p_ccb = p_ccb->p_next_ccb)
{
l2c_csm_execute (p_ccb, L2CEVT_LP_CONNECT_CFM, &ci);
}
if (p_lcb->p_echo_rsp_cb)
{
l2cu_send_peer_echo_req (p_lcb, NULL, 0);
btu_start_timer (&p_lcb->timer_entry, BTU_TTYPE_L2CAP_LINK, L2CAP_ECHO_RSP_TOUT);
}
else if (!p_lcb->ccb_queue.p_first_ccb)
{
btu_start_timer (&p_lcb->timer_entry, BTU_TTYPE_L2CAP_LINK, L2CAP_LINK_STARTUP_TOUT);
}
}
/* Max number of acl connections. */
/* If there's an lcb disconnecting set this one to holding */
else if ((ci.status == HCI_ERR_MAX_NUM_OF_CONNECTIONS) && l2cu_lcb_disconnecting())
{
p_lcb->link_state = LST_CONNECT_HOLDING;
p_lcb->handle = HCI_INVALID_HANDLE;
}
else
{
/* Just in case app decides to try again in the callback context */
p_lcb->link_state = LST_DISCONNECTING;
/* Connection failed. For all channels, send the event through */
/* their FSMs. The CCBs should remove themselves from the LCB */
for (p_ccb = p_lcb->ccb_queue.p_first_ccb; p_ccb; )
{
tL2C_CCB *pn = p_ccb->p_next_ccb;
l2c_csm_execute (p_ccb, L2CEVT_LP_CONNECT_CFM_NEG, &ci);
p_ccb = pn;
}
p_lcb->disc_reason = status;
/* Release the LCB */
if (p_lcb->ccb_queue.p_first_ccb == NULL)
l2cu_release_lcb (p_lcb);
else /* there are any CCBs remaining */
{
if (ci.status == HCI_ERR_CONNECTION_EXISTS)
{
/* we are in collision situation, wait for connecttion request from controller */
p_lcb->link_state = LST_CONNECTING;
}
else
{
l2cu_create_conn(p_lcb);
}
}
}
return (TRUE);
}
/*******************************************************************************
**
** Function l2c_link_sec_comp
**
** Description This function is called when required security procedures
** are completed.
**
** Returns void
**
*******************************************************************************/
void l2c_link_sec_comp (BD_ADDR p_bda, void *p_ref_data, UINT8 status)
{
tL2C_CONN_INFO ci;
tL2C_LCB *p_lcb;
tL2C_CCB *p_ccb;
tL2C_CCB *p_next_ccb;
UINT8 event;
L2CAP_TRACE_DEBUG2 ("l2c_link_sec_comp: %d, 0x%x", status, p_ref_data);
if (status == BTM_SUCCESS_NO_SECURITY)
status = BTM_SUCCESS;
/* Save the parameters */
ci.status = status;
memcpy (ci.bd_addr, p_bda, BD_ADDR_LEN);
p_lcb = l2cu_find_lcb_by_bd_addr (p_bda);
/* If we don't have one, this is an error */
if (!p_lcb)
{
L2CAP_TRACE_WARNING0 ("L2CAP got sec_comp for unknown BD_ADDR");
return;
}
/* Match p_ccb with p_ref_data returned by sec manager */
for (p_ccb = p_lcb->ccb_queue.p_first_ccb; p_ccb; p_ccb = p_next_ccb)
{
p_next_ccb = p_ccb->p_next_ccb;
if (p_ccb == p_ref_data)
{
switch(status)
{
case BTM_SUCCESS:
L2CAP_TRACE_DEBUG1 ("ccb timer ticks: %u", p_ccb->timer_entry.ticks);
event = L2CEVT_SEC_COMP;
break;
case BTM_DELAY_CHECK:
/* start a timer - encryption change not received before L2CAP connect req */
btu_start_timer (&p_ccb->timer_entry, BTU_TTYPE_L2CAP_CHNL, L2CAP_DELAY_CHECK_SM4);
return;
default:
event = L2CEVT_SEC_COMP_NEG;
}
l2c_csm_execute (p_ccb, event, &ci);
break;
}
}
}
/*******************************************************************************
**
** Function l2c_link_hci_disc_comp
**
** Description This function is called when an HCI Disconnect Complete
** event is received.
**
** Returns TRUE if the link is known about, else FALSE
**
*******************************************************************************/
BOOLEAN l2c_link_hci_disc_comp (UINT16 handle, UINT8 reason)
{
tL2C_LCB *p_lcb;
tL2C_CCB *p_ccb;
BOOLEAN status = TRUE;
BOOLEAN lcb_is_free = TRUE;
/* See if we have a link control block for the connection */
p_lcb = l2cu_find_lcb_by_handle (handle);
/* If we don't have one, maybe an SCO link. Send to MM */
if (!p_lcb)
{
status = FALSE;
}
else
{
/* There can be a case when we rejected PIN code authentication */
/* otherwise save a new reason */
if (btm_cb.acl_disc_reason != HCI_ERR_HOST_REJECT_SECURITY)
btm_cb.acl_disc_reason = reason;
p_lcb->disc_reason = btm_cb.acl_disc_reason;
/* Just in case app decides to try again in the callback context */
p_lcb->link_state = LST_DISCONNECTING;
/* Link is disconnected. For all channels, send the event through */
/* their FSMs. The CCBs should remove themselves from the LCB */
for (p_ccb = p_lcb->ccb_queue.p_first_ccb; p_ccb; )
{
tL2C_CCB *pn = p_ccb->p_next_ccb;
/* Keep connect pending control block (if exists)
* Possible Race condition when a reconnect occurs
* on the channel during a disconnect of link. This
* ccb will be automatically retried after link disconnect
* arrives
*/
if (p_ccb != p_lcb->p_pending_ccb)
{
l2c_csm_execute (p_ccb, L2CEVT_LP_DISCONNECT_IND, &reason);
}
p_ccb = pn;
}
#if BTM_SCO_INCLUDED == TRUE
/* Tell SCO management to drop any SCOs on this ACL */
btm_sco_acl_removed (p_lcb->remote_bd_addr);
#endif
/* If waiting for disconnect and reconnect is pending start the reconnect now
race condition where layer above issued connect request on link that was
disconnecting
*/
if (p_lcb->ccb_queue.p_first_ccb != NULL)
{
#if (L2CAP_NUM_FIXED_CHNLS > 0)
/* If we are going to re-use the LCB without dropping it, release all fixed channels here */
int xx;
for (xx = 0; xx < L2CAP_NUM_FIXED_CHNLS; xx++)
{
if (p_lcb->p_fixed_ccbs[xx])
{
(*l2cb.fixed_reg[xx].pL2CA_FixedConn_Cb)(p_lcb->remote_bd_addr, FALSE, p_lcb->disc_reason);
l2cu_release_ccb (p_lcb->p_fixed_ccbs[xx]);
p_lcb->p_fixed_ccbs[xx] = NULL;
}
}
#endif
L2CAP_TRACE_DEBUG0("l2c_link_hci_disc_comp: Restarting pending ACL request");
if (l2cu_create_conn(p_lcb))
lcb_is_free = FALSE; /* still using this lcb */
}
p_lcb->p_pending_ccb = NULL;
/* Release the LCB */
if (lcb_is_free)
l2cu_release_lcb (p_lcb);
}
/* Now that we have a free acl connection, see if any lcbs are pending */
if (lcb_is_free && ((p_lcb = l2cu_find_lcb_by_state(LST_CONNECT_HOLDING)) != NULL))
{
/* we found one-- create a connection */
l2cu_create_conn(p_lcb);
}
return status;
}
/*******************************************************************************
**
** Function l2c_link_hci_qos_violation
**
** Description This function is called when an HCI QOS Violation
** event is received.
**
** Returns TRUE if the link is known about, else FALSE
**
*******************************************************************************/
BOOLEAN l2c_link_hci_qos_violation (UINT16 handle)
{
tL2C_LCB *p_lcb;
tL2C_CCB *p_ccb;
/* See if we have a link control block for the connection */
p_lcb = l2cu_find_lcb_by_handle (handle);
/* If we don't have one, maybe an SCO link. */
if (!p_lcb)
return (FALSE);
/* For all channels, tell the upper layer about it */
for (p_ccb = p_lcb->ccb_queue.p_first_ccb; p_ccb; p_ccb = p_ccb->p_next_ccb)
{
if (p_ccb->p_rcb->api.pL2CA_QoSViolationInd_Cb)
l2c_csm_execute (p_ccb, L2CEVT_LP_QOS_VIOLATION_IND, NULL);
}
return (TRUE);
}
/*******************************************************************************
**
** Function l2c_link_timeout
**
** Description This function is called when a link timer expires
**
** Returns void
**
*******************************************************************************/
void l2c_link_timeout (tL2C_LCB *p_lcb)
{
tL2C_CCB *p_ccb;
UINT16 timeout;
tBTM_STATUS rc;
L2CAP_TRACE_EVENT3 ("L2CAP - l2c_link_timeout() link state %d first CCB %p is_bonding:%d",
p_lcb->link_state, p_lcb->ccb_queue.p_first_ccb, p_lcb->is_bonding);
/* If link was connecting or disconnecting, clear all channels and drop the LCB */
if ((p_lcb->link_state == LST_CONNECTING_WAIT_SWITCH) ||
(p_lcb->link_state == LST_CONNECTING) ||
(p_lcb->link_state == LST_CONNECT_HOLDING) ||
(p_lcb->link_state == LST_DISCONNECTING))
{
p_lcb->p_pending_ccb = NULL;
/* For all channels, send a disconnect indication event through */
/* their FSMs. The CCBs should remove themselves from the LCB */
for (p_ccb = p_lcb->ccb_queue.p_first_ccb; p_ccb; )
{
tL2C_CCB *pn = p_ccb->p_next_ccb;
l2c_csm_execute (p_ccb, L2CEVT_LP_DISCONNECT_IND, NULL);
p_ccb = pn;
}
#if (BLE_INCLUDED == TRUE)
if (p_lcb->link_state == LST_CONNECTING &&
l2cb.is_ble_connecting == TRUE)
{
L2CA_CancelBleConnectReq(l2cb.ble_connecting_bda);
}
#endif
/* Release the LCB */
l2cu_release_lcb (p_lcb);
}
/* If link is connected, check for inactivity timeout */
if (p_lcb->link_state == LST_CONNECTED)
{
/* Check for ping outstanding */
if (p_lcb->p_echo_rsp_cb)
{
tL2CA_ECHO_RSP_CB *p_cb = p_lcb->p_echo_rsp_cb;
/* Zero out the callback in case app immediately calls us again */
p_lcb->p_echo_rsp_cb = NULL;
(*p_cb) (L2CAP_PING_RESULT_NO_RESP);
L2CAP_TRACE_WARNING0 ("L2CAP - ping timeout");
/* For all channels, send a disconnect indication event through */
/* their FSMs. The CCBs should remove themselves from the LCB */
for (p_ccb = p_lcb->ccb_queue.p_first_ccb; p_ccb; )
{
tL2C_CCB *pn = p_ccb->p_next_ccb;
l2c_csm_execute (p_ccb, L2CEVT_LP_DISCONNECT_IND, NULL);
p_ccb = pn;
}
}
/* If no channels in use, drop the link. */
if (!p_lcb->ccb_queue.p_first_ccb)
{
rc = btm_sec_disconnect (p_lcb->handle, HCI_ERR_PEER_USER);
if (rc == BTM_CMD_STORED)
{
/* Security Manager will take care of disconnecting, state will be updated at that time */
timeout = 0xFFFF;
}
else if (rc == BTM_CMD_STARTED)
{
p_lcb->link_state = LST_DISCONNECTING;
timeout = L2CAP_LINK_DISCONNECT_TOUT;
}
else if (rc == BTM_SUCCESS)
{
/* BTM SEC will make sure that link is release (probably after pairing is done) */
p_lcb->link_state = LST_DISCONNECTING;
timeout = 0xFFFF;
}
else if (rc == BTM_BUSY)
{
/* BTM is still executing security process. Let lcb stay as connected */
timeout = 0xFFFF;
}
else if ((p_lcb->is_bonding)
&& (btsnd_hcic_disconnect (p_lcb->handle, HCI_ERR_PEER_USER)))
{
p_lcb->link_state = LST_DISCONNECTING;
timeout = L2CAP_LINK_DISCONNECT_TOUT;
}
else
{
/* probably no buffer to send disconnect */
timeout = BT_1SEC_TIMEOUT;
}
if (timeout != 0xFFFF)
{
btu_start_timer (&p_lcb->timer_entry, BTU_TTYPE_L2CAP_LINK, timeout);
}
}
else
{
/* Check in case we were flow controlled */
l2c_link_check_send_pkts (p_lcb, NULL, NULL);
}
}
}
/*******************************************************************************
**
** Function l2c_info_timeout
**
** Description This function is called when an info request times out
**
** Returns void
**
*******************************************************************************/
void l2c_info_timeout (tL2C_LCB *p_lcb)
{
tL2C_CCB *p_ccb;
tL2C_CONN_INFO ci;
/* If we timed out waiting for info response, just continue using basic if allowed */
if (p_lcb->w4_info_rsp)
{
/* If waiting for security complete, restart the info response timer */
for (p_ccb = p_lcb->ccb_queue.p_first_ccb; p_ccb; p_ccb = p_ccb->p_next_ccb)
{
if ( (p_ccb->chnl_state == CST_ORIG_W4_SEC_COMP) || (p_ccb->chnl_state == CST_TERM_W4_SEC_COMP) )
{
btu_start_timer (&p_lcb->info_timer_entry, BTU_TTYPE_L2CAP_INFO, L2CAP_WAIT_INFO_RSP_TOUT);
return;
}
}
p_lcb->w4_info_rsp = FALSE;
/* If link is in process of being brought up */
if ((p_lcb->link_state != LST_DISCONNECTED) &&
(p_lcb->link_state != LST_DISCONNECTING))
{
/* Notify active channels that peer info is finished */
if (p_lcb->ccb_queue.p_first_ccb)
{
ci.status = HCI_SUCCESS;
memcpy (ci.bd_addr, p_lcb->remote_bd_addr, sizeof(BD_ADDR));
for (p_ccb = p_lcb->ccb_queue.p_first_ccb; p_ccb; p_ccb = p_ccb->p_next_ccb)
{
l2c_csm_execute (p_ccb, L2CEVT_L2CAP_INFO_RSP, &ci);
}
}
}
}
}
/*******************************************************************************
**
** Function l2c_link_adjust_allocation
**
** Description This function is called when a link is created or removed
** to calculate the amount of packets each link may send to
** the HCI without an ack coming back.
**
** Currently, this is a simple allocation, dividing the
** number of Controller Packets by the number of links. In
** the future, QOS configuration should be examined.
**
** Returns void
**
*******************************************************************************/
void l2c_link_adjust_allocation (void)
{
UINT16 qq, yy, qq_remainder;
tL2C_LCB *p_lcb;
UINT16 hi_quota, low_quota;
UINT16 num_lowpri_links = 0;
UINT16 num_hipri_links = 0;
UINT16 controller_xmit_quota = l2cb.num_lm_acl_bufs;
UINT16 high_pri_link_quota = L2CAP_HIGH_PRI_MIN_XMIT_QUOTA_A;
/* If no links active, nothing to do. */
if (l2cb.num_links_active == 0)
{
l2cb.controller_xmit_window = l2cb.num_lm_acl_bufs;
l2cb.round_robin_quota = l2cb.round_robin_unacked = 0;
return;
}
/* First, count the links */
for (yy = 0, p_lcb = &l2cb.lcb_pool[0]; yy < MAX_L2CAP_LINKS; yy++, p_lcb++)
{
if (p_lcb->in_use)
{
if (p_lcb->acl_priority == L2CAP_PRIORITY_HIGH)
num_hipri_links++;
else
num_lowpri_links++;
}
}
/* now adjust high priority link quota */
low_quota = num_lowpri_links ? 1 : 0;
while ( (num_hipri_links * high_pri_link_quota + low_quota) > controller_xmit_quota )
high_pri_link_quota--;
/* Work out the xmit quota and buffer quota high and low priorities */
hi_quota = num_hipri_links * high_pri_link_quota;
low_quota = (hi_quota < controller_xmit_quota) ? controller_xmit_quota - hi_quota : 1;
/* Work out and save the HCI xmit quota for each low priority link */
/* If each low priority link cannot have at least one buffer */
if (num_lowpri_links > low_quota)
{
l2cb.round_robin_quota = low_quota;
qq = qq_remainder = 0;
}
/* If each low priority link can have at least one buffer */
else if (num_lowpri_links > 0)
{
l2cb.round_robin_quota = 0;
l2cb.round_robin_unacked = 0;
qq = low_quota / num_lowpri_links;
qq_remainder = low_quota % num_lowpri_links;
}
/* If no low priority link */
else
{
l2cb.round_robin_quota = 0;
l2cb.round_robin_unacked = 0;
qq = qq_remainder = 0;
}
L2CAP_TRACE_EVENT5 ("l2c_link_adjust_allocation num_hipri: %u num_lowpri: %u low_quota: %u round_robin_quota: %u qq: %u",
num_hipri_links, num_lowpri_links, low_quota,
l2cb.round_robin_quota, qq);
/* Now, assign the quotas to each link */
for (yy = 0, p_lcb = &l2cb.lcb_pool[0]; yy < MAX_L2CAP_LINKS; yy++, p_lcb++)
{
if (p_lcb->in_use)
{
if (p_lcb->acl_priority == L2CAP_PRIORITY_HIGH)
{
p_lcb->link_xmit_quota = high_pri_link_quota;
}
else
{
/* Safety check in case we switched to round-robin with something outstanding */
/* if sent_not_acked is added into round_robin_unacked then don't add it again */
/* l2cap keeps updating sent_not_acked for exiting from round robin */
if (( p_lcb->link_xmit_quota > 0 )&&( qq == 0 ))
l2cb.round_robin_unacked += p_lcb->sent_not_acked;
p_lcb->link_xmit_quota = qq;
if (qq_remainder > 0)
{
p_lcb->link_xmit_quota++;
qq_remainder--;
}
}
#if L2CAP_HOST_FLOW_CTRL
p_lcb->link_ack_thresh = L2CAP_HOST_FC_ACL_BUFS / l2cb.num_links_active;
#endif
L2CAP_TRACE_EVENT3 ("l2c_link_adjust_allocation LCB %d Priority: %d XmitQuota: %d",
yy, p_lcb->acl_priority, p_lcb->link_xmit_quota);
L2CAP_TRACE_EVENT2 (" SentNotAcked: %d RRUnacked: %d",
p_lcb->sent_not_acked, l2cb.round_robin_unacked);
/* There is a special case where we have readjusted the link quotas and */
/* this link may have sent anything but some other link sent packets so */
/* so we may need a timer to kick off this link's transmissions. */
if ( (p_lcb->link_state == LST_CONNECTED)
&& (p_lcb->link_xmit_data_q.count)
&& (p_lcb->sent_not_acked < p_lcb->link_xmit_quota) )
btu_start_timer (&p_lcb->timer_entry, BTU_TTYPE_L2CAP_LINK, L2CAP_LINK_FLOW_CONTROL_TOUT);
}
}
}
/*******************************************************************************
**
** Function l2c_link_adjust_chnl_allocation
**
** Description This function is called to calculate the amount of packets each
** non-F&EC channel may have outstanding.
**
** Currently, this is a simple allocation, dividing the number
** of packets allocated to the link by the number of channels. In
** the future, QOS configuration should be examined.
**
** Returns void
**
*******************************************************************************/
void l2c_link_adjust_chnl_allocation (void)
{
tL2C_CCB *p_ccb;
UINT8 xx;
UINT16 weighted_chnls[GKI_NUM_TOTAL_BUF_POOLS];
UINT16 quota_per_weighted_chnls[GKI_NUM_TOTAL_BUF_POOLS];
UINT16 reserved_buff[GKI_NUM_TOTAL_BUF_POOLS];
L2CAP_TRACE_DEBUG0 ("l2c_link_adjust_chnl_allocation");
/* initialize variables */
for (xx = 0; xx < GKI_NUM_TOTAL_BUF_POOLS; xx++ )
{
weighted_chnls[xx] = 0;
reserved_buff[xx] = 0;
}
/* add up all of tx and rx data rate requirement */
/* channel required higher data rate will get more buffer quota */
for (xx = 0; xx < MAX_L2CAP_CHANNELS; xx++)
{
p_ccb = l2cb.ccb_pool + xx;
if (!p_ccb->in_use)
continue;
if (p_ccb->peer_cfg.fcr.mode != L2CAP_FCR_BASIC_MODE)
{
weighted_chnls[p_ccb->ertm_info.user_tx_pool_id] += p_ccb->tx_data_rate;
weighted_chnls[p_ccb->ertm_info.user_rx_pool_id] += p_ccb->rx_data_rate;
if (p_ccb->ertm_info.fcr_tx_pool_id == HCI_ACL_POOL_ID)
{
/* reserve buffers only for wait_for_ack_q to maximize throughput */
/* retrans_q will work based on buffer status */
reserved_buff[HCI_ACL_POOL_ID] += p_ccb->peer_cfg.fcr.tx_win_sz;
}
if (p_ccb->ertm_info.fcr_rx_pool_id == HCI_ACL_POOL_ID)
{
/* reserve buffers for srej_rcv_hold_q */
reserved_buff[HCI_ACL_POOL_ID] += p_ccb->peer_cfg.fcr.tx_win_sz;
}
}
else
{
/* low data rate is 1, medium is 2, high is 3 and no traffic is 0 */
weighted_chnls[HCI_ACL_POOL_ID] += p_ccb->tx_data_rate + p_ccb->rx_data_rate;
}
}
/* get unit quota per pool */
for (xx = 0; xx < GKI_NUM_TOTAL_BUF_POOLS; xx++ )
{
if ( weighted_chnls[xx] > 0 )
{
if (GKI_poolcount(xx) > reserved_buff[xx])
quota_per_weighted_chnls[xx] = ((GKI_poolcount(xx) - reserved_buff[xx])/weighted_chnls[xx]) + 1;
else
quota_per_weighted_chnls[xx] = 1;
L2CAP_TRACE_DEBUG5 ("POOL ID:%d, GKI_poolcount = %d, reserved_buff = %d, weighted_chnls = %d, quota_per_weighted_chnls = %d",
xx, GKI_poolcount(xx), reserved_buff[xx], weighted_chnls[xx], quota_per_weighted_chnls[xx] );
}
else
quota_per_weighted_chnls[xx] = 0;
}
/* assign buffer quota to each channel based on its data rate requirement */
for (xx = 0; xx < MAX_L2CAP_CHANNELS; xx++)
{
p_ccb = l2cb.ccb_pool + xx;
if (!p_ccb->in_use)
continue;
if (p_ccb->peer_cfg.fcr.mode != L2CAP_FCR_BASIC_MODE)
{
p_ccb->buff_quota = quota_per_weighted_chnls[p_ccb->ertm_info.user_tx_pool_id] * p_ccb->tx_data_rate;
L2CAP_TRACE_EVENT6 ("CID:0x%04x FCR Mode:%u UserTxPool:%u Priority:%u TxDataRate:%u Quota:%u",
p_ccb->local_cid, p_ccb->peer_cfg.fcr.mode, p_ccb->ertm_info.user_tx_pool_id,
p_ccb->ccb_priority, p_ccb->tx_data_rate, p_ccb->buff_quota);
}
else
{
p_ccb->buff_quota = quota_per_weighted_chnls[HCI_ACL_POOL_ID] * p_ccb->tx_data_rate;
L2CAP_TRACE_EVENT4 ("CID:0x%04x Priority:%u TxDataRate:%u Quota:%u",
p_ccb->local_cid,
p_ccb->ccb_priority, p_ccb->tx_data_rate, p_ccb->buff_quota);
}
/* quota may be change so check congestion */
l2cu_check_channel_congestion (p_ccb);
}
}
/*******************************************************************************
**
** Function l2c_link_processs_num_bufs
**
** Description This function is called when a "controller buffer size"
** event is first received from the controller. It updates
** the L2CAP values.
**
** Returns void
**
*******************************************************************************/
void l2c_link_processs_num_bufs (UINT16 num_lm_acl_bufs)
{
l2cb.num_lm_acl_bufs = l2cb.controller_xmit_window = num_lm_acl_bufs;
}
/*******************************************************************************
**
** Function l2c_link_pkts_rcvd
**
** Description This function is called from the HCI transport when it is time
** tto send a "Host ready for packets" command. This is only when
** host to controller flow control is used. If fills in the arrays
** of numbers of packets and handles.
**
** Returns count of number of entries filled in
**
*******************************************************************************/
UINT8 l2c_link_pkts_rcvd (UINT16 *num_pkts, UINT16 *handles)
{
UINT8 num_found = 0;
#if (L2CAP_HOST_FLOW_CTRL == TRUE)
int xx;
tL2C_LCB *p_lcb = &l2cb.lcb_pool[0];
for (xx = 0; xx < MAX_L2CAP_LINKS; xx++, p_lcb++)
{
if ((p_lcb->in_use) && (p_lcb->link_pkts_unacked))
{
num_pkts[num_found] = p_lcb->link_pkts_unacked;
handles[num_found] = p_lcb->handle;
p_lcb->link_pkts_unacked = 0;
num_found++;
}
}
#endif
return (num_found);
}
/*******************************************************************************
**
** Function l2c_link_role_changed
**
** Description This function is called whan a link's master/slave role change
** event is received. It simply updates the link control block.
**
** Returns void
**
*******************************************************************************/
void l2c_link_role_changed (BD_ADDR bd_addr, UINT8 new_role, UINT8 hci_status)
{
tL2C_LCB *p_lcb;
int xx;
/* Make sure not called from HCI Command Status (bd_addr and new_role are invalid) */
if (bd_addr)
{
/* If here came form hci role change event */
p_lcb = l2cu_find_lcb_by_bd_addr (bd_addr);
if (p_lcb)
{
p_lcb->link_role = new_role;
/* Reset high priority link if needed */
if (hci_status == HCI_SUCCESS)
l2cu_set_acl_priority(bd_addr, p_lcb->acl_priority, TRUE);
}
}
/* Check if any LCB was waiting for switch to be completed */
for (xx = 0, p_lcb = &l2cb.lcb_pool[0]; xx < MAX_L2CAP_LINKS; xx++, p_lcb++)
{
if ((p_lcb->in_use) && (p_lcb->link_state == LST_CONNECTING_WAIT_SWITCH))
{
l2cu_create_conn_after_switch (p_lcb);
}
}
}
/*******************************************************************************
**
** Function l2c_pin_code_request
**
** Description This function is called whan a pin-code request is received
** on a connection. If there are no channels active yet on the
** link, it extends the link first connection timer. Make sure
** that inactivity timer is not extended if PIN code happens
** to be after last ccb released.
**
** Returns void
**
*******************************************************************************/
void l2c_pin_code_request (BD_ADDR bd_addr)
{
tL2C_LCB *p_lcb = l2cu_find_lcb_by_bd_addr (bd_addr);
if ( (p_lcb) && (!p_lcb->ccb_queue.p_first_ccb) )
{
btu_start_timer (&p_lcb->timer_entry, BTU_TTYPE_L2CAP_LINK, L2CAP_LINK_CONNECT_TOUT_EXT);
}
}
#if ((BTM_PWR_MGR_INCLUDED == TRUE) && L2CAP_WAKE_PARKED_LINK == TRUE)
/*******************************************************************************
**
** Function l2c_link_check_power_mode
**
** Description This function is called to check power mode.
**
** Returns TRUE if link is going to be active from park
** FALSE if nothing to send or not in park mode
**
*******************************************************************************/
BOOLEAN l2c_link_check_power_mode (tL2C_LCB *p_lcb)
{
tBTM_PM_MODE mode;
tBTM_PM_PWR_MD pm;
tL2C_CCB *p_ccb;
BOOLEAN need_to_active = FALSE;
/*
* We only switch park to active only if we have unsent packets
*/
if ( p_lcb->link_xmit_data_q.count == 0 )
{
for (p_ccb = p_lcb->ccb_queue.p_first_ccb; p_ccb; p_ccb = p_ccb->p_next_ccb)
{
if (p_ccb->xmit_hold_q.count != 0)
{
need_to_active = TRUE;
break;
}
}
}
else
need_to_active = TRUE;
/* if we have packets to send */
if ( need_to_active )
{
/* check power mode */
if (BTM_ReadPowerMode(p_lcb->remote_bd_addr, &mode) == BTM_SUCCESS)
{
/*
if ( mode == BTM_PM_MD_PARK )
{
L2CAP_TRACE_DEBUG1 ("LCB(0x%x) is in park mode", p_lcb->handle);
// Coverity:
// FALSE-POSITIVE error from Coverity test tool. Please do NOT remove following comment.
// coverity[uninit_use_in_call] False-positive: setting the mode to BTM_PM_MD_ACTIVE only uses settings.mode
the other data members of tBTM_PM_PWR_MD are ignored
memset((void*)&pm, 0, sizeof(pm));
pm.mode = BTM_PM_MD_ACTIVE;
BTM_SetPowerMode(BTM_PM_SET_ONLY_ID, p_lcb->remote_bd_addr, &pm);
btu_start_timer (&p_lcb->timer_entry,
BTU_TTYPE_L2CAP_LINK, L2CAP_WAIT_UNPARK_TOUT);
return TRUE;
}
*/
if ( mode == BTM_PM_STS_PENDING )
{
L2CAP_TRACE_DEBUG1 ("LCB(0x%x) is in PM pending state", p_lcb->handle);
btu_start_timer (&p_lcb->timer_entry,
BTU_TTYPE_L2CAP_LINK, L2CAP_WAIT_UNPARK_TOUT);
return TRUE;
}
}
}
return FALSE;
}
#endif /* ((BTM_PWR_MGR_INCLUDED == TRUE) && L2CAP_WAKE_PARKED_LINK == TRUE) */
/*******************************************************************************
**
** Function l2c_link_check_send_pkts
**
** Description This function is called to check if it can send packets
** to the Host Controller. It may be passed the address of
** a packet to send.
**
** Returns void
**
*******************************************************************************/
void l2c_link_check_send_pkts (tL2C_LCB *p_lcb, tL2C_CCB *p_ccb, BT_HDR *p_buf)
{
int xx;
BOOLEAN single_write = FALSE;
/* Save the channel ID for faster counting */
if (p_buf)
{
if (p_ccb != NULL)
{
p_buf->event = p_ccb->local_cid;
single_write = TRUE;
}
else
p_buf->event = 0;
p_buf->layer_specific = 0;
GKI_enqueue (&p_lcb->link_xmit_data_q, p_buf);
if (p_lcb->link_xmit_quota == 0)
l2cb.check_round_robin = TRUE;
}
/* If this is called from uncongested callback context break recursive calling.
** This LCB will be served when receiving number of completed packet event.
*/
if (l2cb.is_cong_cback_context)
return;
/* If we are in a scenario where there are not enough buffers for each link to
** have at least 1, then do a round-robin for all the LCBs
*/
if ( (p_lcb == NULL) || (p_lcb->link_xmit_quota == 0) )
{
if (p_lcb == NULL)
p_lcb = l2cb.lcb_pool;
else if (!single_write)
p_lcb++;
/* Loop through, starting at the next */
for (xx = 0; xx < MAX_L2CAP_LINKS; xx++, p_lcb++)
{
/* If controller window is full, nothing to do */
if ( (l2cb.controller_xmit_window == 0
#if (BLE_INCLUDED == TRUE)
&& !p_lcb->is_ble_link
#endif
)
#if (BLE_INCLUDED == TRUE)
|| (p_lcb->is_ble_link && l2cb.controller_le_xmit_window == 0 )
#endif
|| (l2cb.round_robin_unacked >= l2cb.round_robin_quota) )
break;
/* Check for wraparound */
if (p_lcb == &l2cb.lcb_pool[MAX_L2CAP_LINKS])
p_lcb = &l2cb.lcb_pool[0];
if ( (!p_lcb->in_use)
|| (p_lcb->partial_segment_being_sent)
|| (p_lcb->link_state != LST_CONNECTED)
|| (p_lcb->link_xmit_quota != 0)
|| (L2C_LINK_CHECK_POWER_MODE (p_lcb)) )
continue;
/* See if we can send anything from the Link Queue */
if ((p_buf = (BT_HDR *)GKI_dequeue (&p_lcb->link_xmit_data_q)) != NULL)
{
l2c_link_send_to_lower (p_lcb, p_buf);
}
else if (single_write)
{
/* If only doing one write, break out */
break;
}
/* If nothing on the link queue, check the channel queue */
else if ((p_buf = l2cu_get_next_buffer_to_send (p_lcb)) != NULL)
{
l2c_link_send_to_lower (p_lcb, p_buf);
}
}
/* If we finished without using up our quota, no need for a safety check */
#if (BLE_INCLUDED == TRUE)
if ( ((l2cb.controller_xmit_window > 0 && !p_lcb->is_ble_link) ||
(l2cb.controller_le_xmit_window > 0 && p_lcb->is_ble_link))
&& (l2cb.round_robin_unacked < l2cb.round_robin_quota) )
#else
if ( (l2cb.controller_xmit_window > 0)
&& (l2cb.round_robin_unacked < l2cb.round_robin_quota) )
#endif
l2cb.check_round_robin = FALSE;
}
else /* if this is not round-robin service */
{
/* If a partial segment is being sent, can't send anything else */
if ( (p_lcb->partial_segment_being_sent)
|| (p_lcb->link_state != LST_CONNECTED)
|| (L2C_LINK_CHECK_POWER_MODE (p_lcb)) )
return;
/* See if we can send anything from the link queue */
#if (BLE_INCLUDED == TRUE)
while ( ((l2cb.controller_xmit_window != 0 && !p_lcb->is_ble_link) ||
(l2cb.controller_le_xmit_window != 0 && p_lcb->is_ble_link))
&& (p_lcb->sent_not_acked < p_lcb->link_xmit_quota))
#else
while ( (l2cb.controller_xmit_window != 0)
&& (p_lcb->sent_not_acked < p_lcb->link_xmit_quota))
#endif
{
if ((p_buf = (BT_HDR *)GKI_dequeue (&p_lcb->link_xmit_data_q)) == NULL)
break;
if (!l2c_link_send_to_lower (p_lcb, p_buf))
break;
}
if (!single_write)
{
/* See if we can send anything for any channel */
#if (BLE_INCLUDED == TRUE)
while ( ((l2cb.controller_xmit_window != 0 && !p_lcb->is_ble_link) ||
(l2cb.controller_le_xmit_window != 0 && p_lcb->is_ble_link))
&& (p_lcb->sent_not_acked < p_lcb->link_xmit_quota))
#else
while ((l2cb.controller_xmit_window != 0) && (p_lcb->sent_not_acked < p_lcb->link_xmit_quota))
#endif
{
if ((p_buf = l2cu_get_next_buffer_to_send (p_lcb)) == NULL)
break;
if (!l2c_link_send_to_lower (p_lcb, p_buf))
break;
}
}
/* There is a special case where we have readjusted the link quotas and */
/* this link may have sent anything but some other link sent packets so */
/* so we may need a timer to kick off this link's transmissions. */
if ( (p_lcb->link_xmit_data_q.count) && (p_lcb->sent_not_acked < p_lcb->link_xmit_quota) )
btu_start_timer (&p_lcb->timer_entry, BTU_TTYPE_L2CAP_LINK, L2CAP_LINK_FLOW_CONTROL_TOUT);
}
}
/*******************************************************************************
**
** Function l2c_link_send_to_lower
**
** Description This function queues the buffer for HCI transmission
**
** Returns TRUE for success, FALSE for fail
**
*******************************************************************************/
static BOOLEAN l2c_link_send_to_lower (tL2C_LCB *p_lcb, BT_HDR *p_buf)
{
UINT16 num_segs;
UINT16 xmit_window, acl_data_size;
#if (BLE_INCLUDED == TRUE)
if ((!p_lcb->is_ble_link && (p_buf->len <= btu_cb.hcit_acl_pkt_size)) ||
(p_lcb->is_ble_link && (p_buf->len <= btu_cb.hcit_ble_acl_pkt_size)))
#else
if (p_buf->len <= btu_cb.hcit_acl_pkt_size)
#endif
{
if (p_lcb->link_xmit_quota == 0)
l2cb.round_robin_unacked++;
p_lcb->sent_not_acked++;
p_buf->layer_specific = 0;
#if (BLE_INCLUDED == TRUE)
if (p_lcb->is_ble_link)
{
l2cb.controller_le_xmit_window--;
L2C_LINK_SEND_BLE_ACL_DATA (p_buf);
}
else
#endif
{
l2cb.controller_xmit_window--;
L2C_LINK_SEND_ACL_DATA (p_buf);
}
}
else
{
#if BLE_INCLUDED == TRUE
if (p_lcb->is_ble_link)
{
acl_data_size = btu_cb.hcit_ble_acl_data_size;
xmit_window = l2cb.controller_le_xmit_window;
}
else
#endif
{
acl_data_size = btu_cb.hcit_acl_data_size;
xmit_window = l2cb.controller_xmit_window;
}
num_segs = (p_buf->len - HCI_DATA_PREAMBLE_SIZE + acl_data_size - 1) / acl_data_size;
/* If doing round-robin, then only 1 segment each time */
if (p_lcb->link_xmit_quota == 0)
{
num_segs = 1;
p_lcb->partial_segment_being_sent = TRUE;
}
else
{
/* Multi-segment packet. Make sure it can fit */
if (num_segs > xmit_window)
{
num_segs = xmit_window;
p_lcb->partial_segment_being_sent = TRUE;
}
if (num_segs > (p_lcb->link_xmit_quota - p_lcb->sent_not_acked))
{
num_segs = (p_lcb->link_xmit_quota - p_lcb->sent_not_acked);
p_lcb->partial_segment_being_sent = TRUE;
}
}
p_buf->layer_specific = num_segs;
#if BLE_INCLUDED == TRUE
if (p_lcb->is_ble_link)
{
l2cb.controller_le_xmit_window -= num_segs;
}
else
#endif
l2cb.controller_xmit_window -= num_segs;
if (p_lcb->link_xmit_quota == 0)
l2cb.round_robin_unacked += num_segs;
p_lcb->sent_not_acked += num_segs;
#if BLE_INCLUDED == TRUE
if (p_lcb->is_ble_link)
{
L2C_LINK_SEND_BLE_ACL_DATA(p_buf);
}
else
#endif
{
L2C_LINK_SEND_ACL_DATA (p_buf);
}
}
#if (L2CAP_HCI_FLOW_CONTROL_DEBUG == TRUE)
#if (BLE_INCLUDED == TRUE)
if (p_lcb->is_ble_link)
{
L2CAP_TRACE_DEBUG6 ("TotalWin=%d,Hndl=0x%x,Quota=%d,Unack=%d,RRQuota=%d,RRUnack=%d",
l2cb.controller_le_xmit_window,
p_lcb->handle,
p_lcb->link_xmit_quota, p_lcb->sent_not_acked,
l2cb.round_robin_quota, l2cb.round_robin_unacked);
}
else
#endif
{
L2CAP_TRACE_DEBUG6 ("TotalWin=%d,Hndl=0x%x,Quota=%d,Unack=%d,RRQuota=%d,RRUnack=%d",
l2cb.controller_xmit_window,
p_lcb->handle,
p_lcb->link_xmit_quota, p_lcb->sent_not_acked,
l2cb.round_robin_quota, l2cb.round_robin_unacked);
}
#endif
return TRUE;
}
/*******************************************************************************
**
** Function l2c_link_process_num_completed_pkts
**
** Description This function is called when a "number-of-completed-packets"
** event is received from the controller. It updates all the
** LCB transmit counts.
**
** Returns void
**
*******************************************************************************/
void l2c_link_process_num_completed_pkts (UINT8 *p)
{
UINT8 num_handles, xx;
UINT16 handle;
UINT16 num_sent;
tL2C_LCB *p_lcb;
STREAM_TO_UINT8 (num_handles, p);
for (xx = 0; xx < num_handles; xx++)
{
STREAM_TO_UINT16 (handle, p);
STREAM_TO_UINT16 (num_sent, p);
p_lcb = l2cu_find_lcb_by_handle (handle);
/* Callback for number of completed packet event */
/* Originally designed for [3DSG] */
if((p_lcb != NULL) && (p_lcb->p_nocp_cb))
{
L2CAP_TRACE_DEBUG0 ("L2CAP - calling NoCP callback");
(*p_lcb->p_nocp_cb)(p_lcb->remote_bd_addr);
}
#if (BLE_INCLUDED == TRUE)
if (p_lcb && p_lcb->is_ble_link)
l2cb.controller_le_xmit_window += num_sent;
else
#endif
{
/* Maintain the total window to the controller */
l2cb.controller_xmit_window += num_sent;
}
if (p_lcb)
{
/* If doing round-robin, adjust communal counts */
if (p_lcb->link_xmit_quota == 0)
{
/* Don't go negative */
if (l2cb.round_robin_unacked > num_sent)
l2cb.round_robin_unacked -= num_sent;
else
l2cb.round_robin_unacked = 0;
}
/* Don't go negative */
if (p_lcb->sent_not_acked > num_sent)
p_lcb->sent_not_acked -= num_sent;
else
p_lcb->sent_not_acked = 0;
l2c_link_check_send_pkts (p_lcb, NULL, NULL);
/* If we were doing round-robin for low priority links, check 'em */
if ( (p_lcb->acl_priority == L2CAP_PRIORITY_HIGH)
&& (l2cb.check_round_robin)
&& (l2cb.round_robin_unacked < l2cb.round_robin_quota) )
{
l2c_link_check_send_pkts (NULL, NULL, NULL);
}
}
#if (L2CAP_HCI_FLOW_CONTROL_DEBUG == TRUE)
if (p_lcb)
{
#if (BLE_INCLUDED == TRUE)
if (p_lcb->is_ble_link)
{
L2CAP_TRACE_DEBUG5 ("TotalWin=%d,LinkUnack(0x%x)=%d,RRCheck=%d,RRUnack=%d",
l2cb.controller_le_xmit_window,
p_lcb->handle, p_lcb->sent_not_acked,
l2cb.check_round_robin, l2cb.round_robin_unacked);
}
else
#endif
{
L2CAP_TRACE_DEBUG5 ("TotalWin=%d,LinkUnack(0x%x)=%d,RRCheck=%d,RRUnack=%d",
l2cb.controller_xmit_window,
p_lcb->handle, p_lcb->sent_not_acked,
l2cb.check_round_robin, l2cb.round_robin_unacked);
}
}
else
{
#if (BLE_INCLUDED == TRUE)
L2CAP_TRACE_DEBUG5 ("TotalWin=%d LE_Win: %d, Handle=0x%x, RRCheck=%d, RRUnack=%d",
l2cb.controller_xmit_window,
l2cb.controller_le_xmit_window,
handle,
l2cb.check_round_robin, l2cb.round_robin_unacked);
#else
L2CAP_TRACE_DEBUG4 ("TotalWin=%d Handle=0x%x RRCheck=%d RRUnack=%d",
l2cb.controller_xmit_window,
handle,
l2cb.check_round_robin, l2cb.round_robin_unacked);
#endif
}
#endif
}
#if (defined(HCILP_INCLUDED) && HCILP_INCLUDED == TRUE)
/* only full stack can enable sleep mode */
btu_check_bt_sleep ();
#endif
}
/*******************************************************************************
**
** Function l2cap_link_chk_pkt_start
**
** Description This function is called from the HCI transport when the first
** 4 bytes of an HCI ACL packet have been received. It checks if the
** packet is the next segment of a fragmented L2CAP message. If it
** is, and the length is OK, it returns the address of the
** starting L2CAP message segment buffer.
**
** Returns the address of the receive buffer HCIT should use
** (CR419: Modified to return NULL in case of error.)
**
** NOTE This assumes that the L2CAP MTU size is less than the size
** of an HCI ACL buffer, so the maximum L2CAP message will fit
** into one buffer.
**
*******************************************************************************/
BT_HDR *l2cap_link_chk_pkt_start (BT_HDR *p_cur_buf)
{
UINT8 *p;
UINT16 handle;
UINT16 hci_len;
UINT16 pkt_type;
tL2C_LCB *p_lcb;
BT_HDR * p_return_buf; /* CR419: To avoid returning from too many places */
if (p_cur_buf)
{
p = (UINT8 *)(p_cur_buf + 1) + p_cur_buf->offset;
}
else
{
return (NULL);
}
/* L2CAP expects all rcvd packets to have a layer-specific value of 0 */
p_cur_buf->layer_specific = 0;
STREAM_TO_UINT16 (handle, p);
STREAM_TO_UINT16 (hci_len, p);
pkt_type = HCID_GET_EVENT (handle);
handle = HCID_GET_HANDLE (handle);
l2cb.p_cur_hcit_lcb = NULL;
/* Find the link that is associated with this handle */
p_lcb = l2cu_find_lcb_by_handle (handle);
/* If no link for this handle, nothing to do. */
if (!p_lcb)
return (p_cur_buf) ;
if (pkt_type == L2CAP_PKT_START) /*** START PACKET ***/
{
/* Start of packet. If we were in the middle of receiving */
/* a packet, it is incomplete. Drop it. */
if (p_lcb->p_hcit_rcv_acl)
{
L2CAP_TRACE_WARNING0 ("L2CAP - dropping incomplete pkt");
GKI_freebuf (p_lcb->p_hcit_rcv_acl);
p_lcb->p_hcit_rcv_acl = NULL;
}
/* Save the active buffer address in the LCB */
if ((p_return_buf = p_cur_buf) != NULL)
{
p_lcb->p_hcit_rcv_acl = p_return_buf;
l2cb.p_cur_hcit_lcb = p_lcb;
}
}
else /*** CONTINUATION PACKET ***/
{
/* Packet continuation. Check if we were expecting it */
if (p_lcb->p_hcit_rcv_acl)
{
UINT16 total_len;
BT_HDR *p_base_buf = p_lcb->p_hcit_rcv_acl;
UINT8 *p_f = (UINT8 *)(p_base_buf + 1) + p_base_buf->offset + 2;
STREAM_TO_UINT16 (total_len, p_f);
/* We were expecting the CONTINUATION packet. If length fits, it can go in the */
/* current buffer. */
if ((total_len + hci_len) <= (L2CAP_MTU_SIZE + HCI_DATA_PREAMBLE_SIZE))
{
/* GKI_freebuf (p_cur_buf); CR419:Do not free it yet */
p_return_buf = p_lcb->p_hcit_rcv_acl; /* CR419: return base buffer */
l2cb.p_cur_hcit_lcb = p_lcb;
if ((p_cur_buf->len > HCI_DATA_PREAMBLE_SIZE))
{
UINT8 * p = (UINT8 *)(p_cur_buf + 1)
+ p_cur_buf->offset
+ HCI_DATA_PREAMBLE_SIZE;
UINT8 * p1 = (UINT8 *)(p_return_buf + 1)
+ p_return_buf->offset
+ p_return_buf->len;
/* Copy data from new buffer into base buffer then update the data */
/* count in the base buffer accordingly. */
memcpy (p1, p, p_cur_buf->len - HCI_DATA_PREAMBLE_SIZE);
p_return_buf->len += (p_cur_buf->len - HCI_DATA_PREAMBLE_SIZE);
}
GKI_freebuf (p_cur_buf);
p_cur_buf = NULL;
/* Update HCI header of first segment (base buffer) with new length */
total_len += hci_len;
p_f = (UINT8 *)(p_base_buf + 1) + p_base_buf->offset + 2;
UINT16_TO_STREAM (p_f, total_len);
}
else
{
/* Packet too long. Drop the base packet */
L2CAP_TRACE_WARNING3 ("L2CAP - dropping too long pkt BufLen: %d total_len: %d hci_len: %d",
p_lcb->p_hcit_rcv_acl->len, total_len, hci_len);
GKI_freebuf (p_lcb->p_hcit_rcv_acl);
p_lcb->p_hcit_rcv_acl = NULL;
p_return_buf = NULL ; /* Can't hold onto it any more */
}
}
else /*** NEITHER START OR CONTINUATION PACKET ***/
{
p_return_buf = NULL ;
}
}
if (p_return_buf == NULL) /* if error is indicated.. */
{
if (p_cur_buf != NULL) /* ..drop input buffer */
GKI_freebuf(p_cur_buf); /* (if present) */
}
return (p_return_buf);
}
/*******************************************************************************
**
** Function l2cap_link_chk_pkt_end
**
** Description This function is called from the HCI transport when the last
** byte of an HCI ACL packet has been received. It checks if the
** L2CAP message is complete, i.e. no more continuation packets
** are expected.
**
** Returns TRUE if message complete, FALSE if continuation expected
**
*******************************************************************************/
BOOLEAN l2cap_link_chk_pkt_end (void)
{
UINT8 *p;
BT_HDR *p_buf;
UINT16 l2cap_len;
tL2C_LCB *p_lcb;
/* If link or buffer pointer not set up, let main line handle it */
if (((p_lcb = l2cb.p_cur_hcit_lcb) == NULL) || ((p_buf = p_lcb->p_hcit_rcv_acl) == NULL))
return (TRUE);
/* Point to the L2CAP length */
p = (UINT8 *)(p_buf + 1) + p_buf->offset + HCI_DATA_PREAMBLE_SIZE;
STREAM_TO_UINT16 (l2cap_len, p);
/* If the L2CAP length has not been reached, tell HCIT not to send this buffer to BTU */
if (l2cap_len > (p_buf->len - (HCI_DATA_PREAMBLE_SIZE + L2CAP_PKT_OVERHEAD)))
{
return (FALSE);
}
else
{
p_lcb->p_hcit_rcv_acl = NULL;
return (TRUE);
}
}
/*******************************************************************************
**
** Function l2c_link_segments_xmitted
**
** Description This function is called from the HCI Interface when an ACL
** data packet segment is transmitted.
**
** Returns void
**
*******************************************************************************/
void l2c_link_segments_xmitted (BT_HDR *p_msg)
{
UINT8 *p = (UINT8 *)(p_msg + 1) + p_msg->offset;
UINT16 handle;
tL2C_LCB *p_lcb;
/* Extract the handle */
STREAM_TO_UINT16 (handle, p);
handle = HCID_GET_HANDLE (handle);
/* Find the LCB based on the handle */
if ((p_lcb = l2cu_find_lcb_by_handle (handle)) == NULL)
{
L2CAP_TRACE_WARNING1 ("L2CAP - rcvd segment complete, unknown handle: %d", handle);
GKI_freebuf (p_msg);
return;
}
if (p_lcb->link_state == LST_CONNECTED)
{
/* Enqueue the buffer to the head of the transmit queue, and see */
/* if we can transmit anything more. */
GKI_enqueue_head (&p_lcb->link_xmit_data_q, p_msg);
p_lcb->partial_segment_being_sent = FALSE;
l2c_link_check_send_pkts (p_lcb, NULL, NULL);
}
else
GKI_freebuf (p_msg);
}