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caif: Disconnect without waiting for response 

Changes:
o Function cfcnfg_disconn_adapt_layer is changed to do asynchronous
  disconnect, not waiting for any response from the modem. Due to this
  the function cfcnfg_linkdestroy_rsp does nothing anymore.
o Because disconnect may take down a connection before a connect response
  is received the function cfcnfg_linkup_rsp is checking if the client is
  still waiting for the response, if not a disconnect request is sent to
  the modem.
o cfctrl is no longer keeping track of pending disconnect requests.
o Added function cfctrl_cancel_req, which is used for deleting a pending
  connect request if disconnect is done before connect response is received.
o Removed unused function cfctrl_insert_req2
o Added better handling of connect reject from modem.

Signed-off-by: Sjur Braendeland <sjur.brandeland@stericsson.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Sjur Braendeland 2010-04-28 08:54:37 +00:00 committed by David S. Miller
parent 5b20865675
commit 8d545c8f95
3 changed files with 111 additions and 146 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
include/net/caif/cfctrl.h
View File

@ -43,8 +43,7 @@ struct cfctrl_rsp {
void (*linksetup_rsp)(struct cflayer *layer, u8 linkid,
enum cfctrl_srv serv, u8 phyid,
struct cflayer *adapt_layer);
void (*linkdestroy_rsp)(struct cflayer *layer, u8 linkid,
struct cflayer *client_layer);
void (*linkdestroy_rsp)(struct cflayer *layer, u8 linkid);
void (*linkerror_ind)(void);
void (*enum_rsp)(void);
void (*sleep_rsp)(void);
@ -117,7 +116,7 @@ struct cfctrl {
};
void cfctrl_enum_req(struct cflayer *cfctrl, u8 physlinkid);
void cfctrl_linkup_request(struct cflayer *cfctrl,
int cfctrl_linkup_request(struct cflayer *cfctrl,
struct cfctrl_link_param *param,
struct cflayer *user_layer);
int cfctrl_linkdown_req(struct cflayer *cfctrl, u8 linkid,
@ -135,4 +134,6 @@ void cfctrl_insert_req(struct cfctrl *ctrl,
struct cfctrl_request_info *req);
struct cfctrl_request_info *cfctrl_remove_req(struct cfctrl *ctrl,
struct cfctrl_request_info *req);
void cfctrl_cancel_req(struct cflayer *layr, struct cflayer *adap_layer);
#endif /* CFCTRL_H_ */

155
net/caif/cfcnfg.c
View File

@ -54,8 +54,7 @@ struct cfcnfg {
static void cfcnfg_linkup_rsp(struct cflayer *layer, u8 channel_id,
enum cfctrl_srv serv, u8 phyid,
struct cflayer *adapt_layer);
static void cfcnfg_linkdestroy_rsp(struct cflayer *layer, u8 channel_id,
struct cflayer *client_layer);
static void cfcnfg_linkdestroy_rsp(struct cflayer *layer, u8 channel_id);
static void cfcnfg_reject_rsp(struct cflayer *layer, u8 channel_id,
struct cflayer *adapt_layer);
static void cfctrl_resp_func(void);
@ -175,73 +174,65 @@ int cfcnfg_get_named(struct cfcnfg *cnfg, char *name)
return 0;
}
/*
* NOTE: What happens on destroy failure:
* 1a) No response - Too early
* This will not happen because enumerate has already
* completed.
* 1b) No response - FATAL
* Not handled, but this should be a CAIF PROTOCOL ERROR
* Modem error, response is really expected - this
* case is not really handled.
* 2) O/E-bit indicate error
* Ignored - this link is destroyed anyway.
* 3) Not able to match on request
* Not handled, but this should be a CAIF PROTOCOL ERROR
* 4) Link-Error - (no response)
* Not handled, but this should be a CAIF PROTOCOL ERROR
*/
int cfcnfg_disconn_adapt_layer(struct cfcnfg *cnfg, struct cflayer *adap_layer)
{
u8 channel_id = 0;
int ret = 0;
struct cflayer *servl = NULL;
struct cfcnfg_phyinfo *phyinfo = NULL;
u8 phyid = 0;
caif_assert(adap_layer != NULL);
channel_id = adap_layer->id;
if (channel_id == 0) {
if (adap_layer->dn == NULL || channel_id == 0) {
pr_err("CAIF: %s():adap_layer->id is 0\n", __func__);
ret = -ENOTCONN;
goto end;
}
if (adap_layer->dn == NULL) {
pr_err("CAIF: %s():adap_layer->dn is NULL\n", __func__);
ret = -ENODEV;
servl = cfmuxl_remove_uplayer(cnfg->mux, channel_id);
if (servl == NULL)
goto end;
}
if (adap_layer->dn != NULL)
phyid = cfsrvl_getphyid(adap_layer->dn);
phyinfo = cfcnfg_get_phyinfo(cnfg, phyid);
if (phyinfo == NULL) {
pr_warning("CAIF: %s(): No interface to send disconnect to\n",
__func__);
ret = -ENODEV;
goto end;
}
if (phyinfo->id != phyid
|| phyinfo->phy_layer->id != phyid
|| phyinfo->frm_layer->id != phyid) {
pr_err("CAIF: %s(): Inconsistency in phy registration\n",
__func__);
layer_set_up(servl, NULL);
ret = cfctrl_linkdown_req(cnfg->ctrl, channel_id, adap_layer);
if (servl == NULL) {
pr_err("CAIF: %s(): PROTOCOL ERROR "
"- Error removing service_layer Channel_Id(%d)",
__func__, channel_id);
ret = -EINVAL;
goto end;
}
caif_assert(channel_id == servl->id);
if (adap_layer->dn != NULL) {
phyid = cfsrvl_getphyid(adap_layer->dn);
ret = cfctrl_linkdown_req(cnfg->ctrl, channel_id, adap_layer);
end:
phyinfo = cfcnfg_get_phyinfo(cnfg, phyid);
if (phyinfo == NULL) {
pr_warning("CAIF: %s(): "
"No interface to send disconnect to\n",
__func__);
ret = -ENODEV;
goto end;
}
if (phyinfo->id != phyid ||
phyinfo->phy_layer->id != phyid ||
phyinfo->frm_layer->id != phyid) {
pr_err("CAIF: %s(): "
"Inconsistency in phy registration\n",
__func__);
ret = -EINVAL;
goto end;
}
}
if (phyinfo != NULL && --phyinfo->phy_ref_count == 0 &&
phyinfo->phy_layer != NULL &&
phyinfo->phy_layer->modemcmd != NULL) {
phyinfo->phy_layer->modemcmd(phyinfo->phy_layer,
_CAIF_MODEMCMD_PHYIF_USELESS);
}
end:
cfsrvl_put(servl);
cfctrl_cancel_req(cnfg->ctrl, adap_layer);
if (adap_layer->ctrlcmd != NULL)
adap_layer->ctrlcmd(adap_layer, CAIF_CTRLCMD_DEINIT_RSP, 0);
return ret;
}
@ -254,69 +245,11 @@ void cfcnfg_release_adap_layer(struct cflayer *adap_layer)
}
EXPORT_SYMBOL(cfcnfg_release_adap_layer);
static void cfcnfg_linkdestroy_rsp(struct cflayer *layer, u8 channel_id,
struct cflayer *client_layer)
static void cfcnfg_linkdestroy_rsp(struct cflayer *layer, u8 channel_id)
{
struct cfcnfg *cnfg = container_obj(layer);
struct cflayer *servl;
/*
* 1) Remove service from the MUX layer. The MUX must
* guarante that no more payload sent "upwards" (receive)
*/
servl = cfmuxl_remove_uplayer(cnfg->mux, channel_id);
if (servl == NULL) {
pr_err("CAIF: %s(): PROTOCOL ERROR "
"- Error removing service_layer Channel_Id(%d)",
__func__, channel_id);
return;
}
caif_assert(channel_id == servl->id);
if (servl != client_layer && servl->up != client_layer) {
pr_err("CAIF: %s(): Error removing service_layer "
"Channel_Id(%d) %p %p",
__func__, channel_id, (void *) servl,
(void *) client_layer);
return;
}
/*
* 2) DEINIT_RSP must guarantee that no more packets are transmitted
* from client (adap_layer) when it returns.
*/
if (servl->ctrlcmd == NULL) {
pr_err("CAIF: %s(): Error servl->ctrlcmd == NULL", __func__);
return;
}
servl->ctrlcmd(servl, CAIF_CTRLCMD_DEINIT_RSP, 0);
/* 3) It is now safe to destroy the service layer. */
cfservl_destroy(servl);
}
/*
* NOTE: What happens on linksetup failure:
* 1a) No response - Too early
* This will not happen because enumerate is secured
* before using interface.
* 1b) No response - FATAL
* Not handled, but this should be a CAIF PROTOCOL ERROR
* Modem error, response is really expected - this case is
* not really handled.
* 2) O/E-bit indicate error
* Handled in cnfg_reject_rsp
* 3) Not able to match on request
* Not handled, but this should be a CAIF PROTOCOL ERROR
* 4) Link-Error - (no response)
* Not handled, but this should be a CAIF PROTOCOL ERROR
*/
int
cfcnfg_add_adaptation_layer(struct cfcnfg *cnfg,
int cfcnfg_add_adaptation_layer(struct cfcnfg *cnfg,
struct cfctrl_link_param *param,
struct cflayer *adap_layer)
{
@ -346,8 +279,7 @@ cfcnfg_add_adaptation_layer(struct cfcnfg *cnfg,
param->phyid);
/* FIXME: ENUMERATE INITIALLY WHEN ACTIVATING PHYSICAL INTERFACE */
cfctrl_enum_req(cnfg->ctrl, param->phyid);
cfctrl_linkup_request(cnfg->ctrl, param, adap_layer);
return 0;
return cfctrl_linkup_request(cnfg->ctrl, param, adap_layer);
}
EXPORT_SYMBOL(cfcnfg_add_adaptation_layer);
@ -367,8 +299,10 @@ cfcnfg_linkup_rsp(struct cflayer *layer, u8 channel_id, enum cfctrl_srv serv,
struct cflayer *servicel = NULL;
struct cfcnfg_phyinfo *phyinfo;
if (adapt_layer == NULL) {
pr_err("CAIF: %s(): PROTOCOL ERROR "
"- LinkUp Request/Response did not match\n", __func__);
pr_debug("CAIF: %s(): link setup response "
"but no client exist, send linkdown back\n",
__func__);
cfctrl_linkdown_req(cnfg->ctrl, channel_id, NULL);
return;
}
@ -424,6 +358,7 @@ cfcnfg_linkup_rsp(struct cflayer *layer, u8 channel_id, enum cfctrl_srv serv,
cfmuxl_set_uplayer(cnfg->mux, servicel, channel_id);
layer_set_up(servicel, adapt_layer);
layer_set_dn(adapt_layer, servicel);
cfsrvl_get(servicel);
servicel->ctrlcmd(servicel, CAIF_CTRLCMD_INIT_RSP, 0);
}

95
net/caif/cfctrl.c
View File

@ -32,6 +32,7 @@ static void cfctrl_ctrlcmd(struct cflayer *layr, enum caif_ctrlcmd ctrl,
struct cflayer *cfctrl_create(void)
{
struct dev_info dev_info;
struct cfctrl *this =
kmalloc(sizeof(struct cfctrl), GFP_ATOMIC);
if (!this) {
@ -39,12 +40,13 @@ struct cflayer *cfctrl_create(void)
return NULL;
}
caif_assert(offsetof(struct cfctrl, serv.layer) == 0);
memset(&dev_info, 0, sizeof(dev_info));
dev_info.id = 0xff;
memset(this, 0, sizeof(*this));
cfsrvl_init(&this->serv, 0, &dev_info);
spin_lock_init(&this->info_list_lock);
atomic_set(&this->req_seq_no, 1);
atomic_set(&this->rsp_seq_no, 1);
this->serv.dev_info.id = 0xff;
this->serv.layer.id = 0;
this->serv.layer.receive = cfctrl_recv;
sprintf(this->serv.layer.name, "ctrl");
this->serv.layer.ctrlcmd = cfctrl_ctrlcmd;
@ -127,20 +129,6 @@ void cfctrl_insert_req(struct cfctrl *ctrl,
spin_unlock(&ctrl->info_list_lock);
}
static void cfctrl_insert_req2(struct cfctrl *ctrl, enum cfctrl_cmd cmd,
u8 linkid, struct cflayer *user_layer)
{
struct cfctrl_request_info *req = kmalloc(sizeof(*req), GFP_KERNEL);
if (!req) {
pr_warning("CAIF: %s(): Out of memory\n", __func__);
return;
}
req->client_layer = user_layer;
req->cmd = cmd;
req->channel_id = linkid;
cfctrl_insert_req(ctrl, req);
}
/* Compare and remove request */
struct cfctrl_request_info *cfctrl_remove_req(struct cfctrl *ctrl,
struct cfctrl_request_info *req)
@ -234,7 +222,7 @@ void cfctrl_enum_req(struct cflayer *layer, u8 physlinkid)
}
}
void cfctrl_linkup_request(struct cflayer *layer,
int cfctrl_linkup_request(struct cflayer *layer,
struct cfctrl_link_param *param,
struct cflayer *user_layer)
{
@ -248,7 +236,7 @@ void cfctrl_linkup_request(struct cflayer *layer,
struct cfpkt *pkt = cfpkt_create(CFPKT_CTRL_PKT_LEN);
if (!pkt) {
pr_warning("CAIF: %s(): Out of memory\n", __func__);
return;
return -ENOMEM;
}
cfpkt_addbdy(pkt, CFCTRL_CMD_LINK_SETUP);
cfpkt_addbdy(pkt, (param->chtype << 4) + param->linktype);
@ -294,11 +282,12 @@ void cfctrl_linkup_request(struct cflayer *layer,
default:
pr_warning("CAIF: %s():Request setup of bad link type = %d\n",
__func__, param->linktype);
return -EINVAL;
}
req = kmalloc(sizeof(*req), GFP_KERNEL);
if (!req) {
pr_warning("CAIF: %s(): Out of memory\n", __func__);
return;
return -ENOMEM;
}
memset(req, 0, sizeof(*req));
req->client_layer = user_layer;
@ -306,6 +295,11 @@ void cfctrl_linkup_request(struct cflayer *layer,
req->param = *param;
cfctrl_insert_req(cfctrl, req);
init_info(cfpkt_info(pkt), cfctrl);
/*
* NOTE:Always send linkup and linkdown request on the same
* device as the payload. Otherwise old queued up payload
* might arrive with the newly allocated channel ID.
*/
cfpkt_info(pkt)->dev_info->id = param->phyid;
ret =
cfctrl->serv.layer.dn->transmit(cfctrl->serv.layer.dn, pkt);
@ -313,7 +307,9 @@ void cfctrl_linkup_request(struct cflayer *layer,
pr_err("CAIF: %s(): Could not transmit linksetup request\n",
__func__);
cfpkt_destroy(pkt);
return -ENODEV;
}
return 0;
}
int cfctrl_linkdown_req(struct cflayer *layer, u8 channelid,
@ -326,7 +322,6 @@ int cfctrl_linkdown_req(struct cflayer *layer, u8 channelid,
pr_warning("CAIF: %s(): Out of memory\n", __func__);
return -ENOMEM;
}
cfctrl_insert_req2(cfctrl, CFCTRL_CMD_LINK_DESTROY, channelid, client);
cfpkt_addbdy(pkt, CFCTRL_CMD_LINK_DESTROY);
cfpkt_addbdy(pkt, channelid);
init_info(cfpkt_info(pkt), cfctrl);
@ -392,6 +387,38 @@ void cfctrl_getstartreason_req(struct cflayer *layer)
}
void cfctrl_cancel_req(struct cflayer *layr, struct cflayer *adap_layer)
{
struct cfctrl_request_info *p, *req;
struct cfctrl *ctrl = container_obj(layr);
spin_lock(&ctrl->info_list_lock);
if (ctrl->first_req == NULL) {
spin_unlock(&ctrl->info_list_lock);
return;
}
if (ctrl->first_req->client_layer == adap_layer) {
req = ctrl->first_req;
ctrl->first_req = ctrl->first_req->next;
kfree(req);
}
p = ctrl->first_req;
while (p != NULL && p->next != NULL) {
if (p->next->client_layer == adap_layer) {
req = p->next;
p->next = p->next->next;
kfree(p->next);
}
p = p->next;
}
spin_unlock(&ctrl->info_list_lock);
}
static int cfctrl_recv(struct cflayer *layer, struct cfpkt *pkt)
{
u8 cmdrsp;
@ -409,11 +436,8 @@ static int cfctrl_recv(struct cflayer *layer, struct cfpkt *pkt)
cmd = cmdrsp & CFCTRL_CMD_MASK;
if (cmd != CFCTRL_CMD_LINK_ERR
&& CFCTRL_RSP_BIT != (CFCTRL_RSP_BIT & cmdrsp)) {
if (handle_loop(cfctrl, cmd, pkt) == CAIF_FAILURE) {
pr_info("CAIF: %s() CAIF Protocol error:"
"Response bit not set\n", __func__);
goto error;
}
if (handle_loop(cfctrl, cmd, pkt) == CAIF_FAILURE)
cmdrsp |= CFCTRL_ERR_BIT;
}
switch (cmd) {
@ -451,12 +475,16 @@ static int cfctrl_recv(struct cflayer *layer, struct cfpkt *pkt)
switch (serv) {
case CFCTRL_SRV_VEI:
case CFCTRL_SRV_DBG:
if (CFCTRL_ERR_BIT & cmdrsp)
break;
/* Link ID */
cfpkt_extr_head(pkt, &linkid, 1);
break;
case CFCTRL_SRV_VIDEO:
cfpkt_extr_head(pkt, &tmp, 1);
linkparam.u.video.connid = tmp;
if (CFCTRL_ERR_BIT & cmdrsp)
break;
/* Link ID */
cfpkt_extr_head(pkt, &linkid, 1);
break;
@ -465,6 +493,8 @@ static int cfctrl_recv(struct cflayer *layer, struct cfpkt *pkt)
cfpkt_extr_head(pkt, &tmp32, 4);
linkparam.u.datagram.connid =
le32_to_cpu(tmp32);
if (CFCTRL_ERR_BIT & cmdrsp)
break;
/* Link ID */
cfpkt_extr_head(pkt, &linkid, 1);
break;
@ -483,6 +513,8 @@ static int cfctrl_recv(struct cflayer *layer, struct cfpkt *pkt)
*cp++ = tmp;
*cp = '\0';
if (CFCTRL_ERR_BIT & cmdrsp)
break;
/* Link ID */
cfpkt_extr_head(pkt, &linkid, 1);
@ -519,6 +551,8 @@ static int cfctrl_recv(struct cflayer *layer, struct cfpkt *pkt)
cfpkt_extr_head(pkt, &tmp, 1);
*cp++ = tmp;
}
if (CFCTRL_ERR_BIT & cmdrsp)
break;
/* Link ID */
cfpkt_extr_head(pkt, &linkid, 1);
/* Length */
@ -560,13 +594,7 @@ static int cfctrl_recv(struct cflayer *layer, struct cfpkt *pkt)
break;
case CFCTRL_CMD_LINK_DESTROY:
cfpkt_extr_head(pkt, &linkid, 1);
rsp.cmd = cmd;
rsp.channel_id = linkid;
req = cfctrl_remove_req(cfctrl, &rsp);
cfctrl->res.linkdestroy_rsp(cfctrl->serv.layer.up, linkid,
req ? req->client_layer : NULL);
if (req != NULL)
kfree(req);
cfctrl->res.linkdestroy_rsp(cfctrl->serv.layer.up, linkid);
break;
case CFCTRL_CMD_LINK_ERR:
pr_err("CAIF: %s(): Frame Error Indication received\n",
@ -608,7 +636,7 @@ static void cfctrl_ctrlcmd(struct cflayer *layr, enum caif_ctrlcmd ctrl,
case CAIF_CTRLCMD_FLOW_OFF_IND:
spin_lock(&this->info_list_lock);
if (this->first_req != NULL) {
pr_warning("CAIF: %s(): Received flow off in "
pr_debug("CAIF: %s(): Received flow off in "
"control layer", __func__);
}
spin_unlock(&this->info_list_lock);
@ -633,6 +661,7 @@ static int handle_loop(struct cfctrl *ctrl, int cmd, struct cfpkt *pkt)
if (!ctrl->loop_linkused[linkid])
goto found;
spin_unlock(&ctrl->loop_linkid_lock);
pr_err("CAIF: %s(): Out of link-ids\n", __func__);
return -EINVAL;
found:
if (!ctrl->loop_linkused[linkid])