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Commit 7c2660b0 authored by Marcel Holtmann's avatar Marcel Holtmann Committed by David S. Miller
Browse files

[Bluetooth] Allow disabling of credit based flow control 



This patch adds the module parameter disable_cfc which can be used to
disable the credit based flow control. The credit based flow control
was introduced with the Bluetooth 1.1 specification and devices can
negotiate its support, but for testing purpose it is helpful to allow
disabling of it.

Signed-off-by: default avatarMarcel Holtmann <marcel@holtmann.org>
parent 0139418c

net/bluetooth/rfcomm/core.c

+13 −5
Original line number Diff line number Diff line
@@ -52,8 +52,9 @@ 
#define BT_DBG(D...)

#endif



#define VERSION "1.7"

#define VERSION "1.8"



static int disable_cfc = 0;

static unsigned int l2cap_mtu = RFCOMM_MAX_L2CAP_MTU;



static struct task_struct *rfcomm_thread;
@@ -533,7 +534,7 @@ static struct rfcomm_session *rfcomm_session_add(struct socket *sock, int state) 
	s->sock  = sock;



	s->mtu = RFCOMM_DEFAULT_MTU;

	s->cfc = RFCOMM_CFC_UNKNOWN;

	s->cfc = disable_cfc ? RFCOMM_CFC_DISABLED : RFCOMM_CFC_UNKNOWN;



	/* Do not increment module usage count for listening sessions.

	 * Otherwise we won't be able to unload the module. */
@@ -1222,14 +1223,18 @@ static int rfcomm_apply_pn(struct rfcomm_dlc *d, int cr, struct rfcomm_pn *pn) 
	BT_DBG("dlc %p state %ld dlci %d mtu %d fc 0x%x credits %d", 

			d, d->state, d->dlci, pn->mtu, pn->flow_ctrl, pn->credits);



	if (pn->flow_ctrl == 0xf0 || pn->flow_ctrl == 0xe0) {

		d->cfc = s->cfc = RFCOMM_CFC_ENABLED;

	if ((pn->flow_ctrl == 0xf0 && s->cfc != RFCOMM_CFC_DISABLED) ||

						pn->flow_ctrl == 0xe0) {

		d->cfc = RFCOMM_CFC_ENABLED;

		d->tx_credits = pn->credits;

	} else {

		d->cfc = s->cfc = RFCOMM_CFC_DISABLED;

		d->cfc = RFCOMM_CFC_DISABLED;

		set_bit(RFCOMM_TX_THROTTLED, &d->flags);

	}



	if (s->cfc == RFCOMM_CFC_UNKNOWN)

		s->cfc = d->cfc;



	d->priority = pn->priority;



	d->mtu = s->mtu = btohs(pn->mtu);
@@ -2073,6 +2078,9 @@ static void __exit rfcomm_exit(void) 
module_init(rfcomm_init);

module_exit(rfcomm_exit);



module_param(disable_cfc, bool, 0644);

MODULE_PARM_DESC(disable_cfc, "Disable credit based flow control");



module_param(l2cap_mtu, uint, 0644);

MODULE_PARM_DESC(l2cap_mtu, "Default MTU for the L2CAP connection");