// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (C) ST-Ericsson AB 2010
* Author: Sjur Brendeland
*/
#define pr_fmt(fmt) KBUILD_MODNAME ":%s(): " fmt, __func__
#include <linux/stddef.h>
#include <linux/spinlock.h>
#include <linux/slab.h>
#include <linux/pkt_sched.h>
#include <net/caif/caif_layer.h>
#include <net/caif/cfpkt.h>
#include <net/caif/cfctrl.h>
#define container_obj(layr) container_of(layr, struct cfctrl, serv.layer)
#define UTILITY_NAME_LENGTH 16
#define CFPKT_CTRL_PKT_LEN 20
#ifdef CAIF_NO_LOOP
static int handle_loop(struct cfctrl *ctrl,
int cmd, struct cfpkt *pkt){
return -1;
}
#else
static int handle_loop(struct cfctrl *ctrl,
int cmd, struct cfpkt *pkt);
#endif
static int cfctrl_recv(struct cflayer *layr, struct cfpkt *pkt);
static void cfctrl_ctrlcmd(struct cflayer *layr, enum caif_ctrlcmd ctrl,
int phyid);
struct cflayer *cfctrl_create(void)
{
struct dev_info dev_info;
struct cfctrl *this =
kzalloc(sizeof(struct cfctrl), GFP_ATOMIC);
if (!this)
return NULL;
caif_assert(offsetof(struct cfctrl, serv.layer) == 0);
memset(&dev_info, 0, sizeof(dev_info));
dev_info.id = 0xff;
cfsrvl_init(&this->serv, 0, &dev_info, false);
atomic_set(&this->req_seq_no, 1);
atomic_set(&this->rsp_seq_no, 1);
this->serv.layer.receive = cfctrl_recv;
sprintf(this->serv.layer.name, "ctrl");
this->serv.layer.ctrlcmd = cfctrl_ctrlcmd;
#ifndef CAIF_NO_LOOP
spin_lock_init(&this->loop_linkid_lock);
this->loop_linkid = 1;
#endif
spin_lock_init(&this->info_list_lock);
INIT_LIST_HEAD(&this->list);
return &this->serv.layer;
}
void cfctrl_remove(struct cflayer *layer)
{
struct cfctrl_request_info *p, *tmp;
struct cfctrl *ctrl = container_obj(layer);
spin_lock_bh(&ctrl->info_list_lock);
list_for_each_entry_safe(p, tmp, &ctrl->list, list) {
list_del(&p->list);
kfree(p);
}
spin_unlock_bh(&ctrl->info_list_lock);
kfree(layer);
}
static bool param_eq(const struct cfctrl_link_param *p1,
const struct cfctrl_link_param *p2)
{
bool eq =
p1->linktype == p2->linktype &&
p1->priority == p2->priority &&
p1->phyid == p2->phyid &&
p1->endpoint == p2->endpoint && p1->chtype == p2->chtype;
if (!eq)
return false;
switch (p1->linktype) {
case CFCTRL_SRV_VEI:
return true;
case CFCTRL_SRV_DATAGRAM:
return p1->u.datagram.connid == p2->u.datagram.connid;
case CFCTRL_SRV_RFM:
return
p1->u.rfm.connid == p2->u.rfm.connid &&
strcmp(p1->u.rfm.volume, p2->u.rfm.volume) == 0;
case CFCTRL_SRV_UTIL:
return
p1->u.utility.fifosize_kb == p2->u.utility.fifosize_kb
&& p1->u.utility.fifosize_bufs ==
p2->u.utility.fifosize_bufs
&& strcmp(p1->u.utility.name, p2->u.utility.name) == 0
&& p1->u.utility.paramlen == p2->u.utility.paramlen
&& memcmp(p1->u.utility.params, p2->u.utility.params,
p1->u.utility.paramlen) == 0;
case CFCTRL_SRV_VIDEO:
return p1->u.video.connid == p2->u.video.connid;
case CFCTRL_SRV_DBG:
return true;
case CFCTRL_SRV_DECM:
return false;
default:
return false;
}
return false;
}
static bool cfctrl_req_eq(const struct cfctrl_request_info *r1,
const struct cfctrl_request_info *r2)
{
if (r1->cmd != r2->cmd)
return false;
if (r1->cmd == CFCTRL_CMD_LINK_SETUP)
return param_eq(&r1->param, &r2->param);
else
return r1->channel_id == r2->channel_id;
}
/* Insert request at the end */
static void cfctrl_insert_req(struct cfctrl *ctrl,
struct cfctrl_request_info *req)
{
spin_lock_bh(&ctrl->info_list_lock);
atomic_inc(&ctrl->req_seq_no);
req->sequence_no = atomic_read(&ctrl->req_seq_no);
list_add_tail(&req->list, &ctrl->list);
spin_unlock_bh(&ctrl->info_list_lock);
}
/* Compare and remove request */
static struct cfctrl_request_info *cfctrl_remove_req(struct cfctrl *ctrl,
struct cfctrl_request_info *req)
{
struct cfctrl_request_info *p, *tmp, *first;
first = list_first_entry(&ctrl->list, struct cfctrl_request_info, list);
list_for_each_entry_safe(p, tmp, &ctrl->list, list) {
if (cfctrl_req_eq(req, p)) {
if (p != first)
pr_warn("Requests are not received in order\n");
atomic_set(&ctrl->rsp_seq_no,
p->sequence_no);
list_del(&p->list);
goto out;
}
}
p = NULL;
out:
return p;
}
struct cfctrl_rsp *cfctrl_get_respfuncs(struct cflayer *layer)
{
struct cfctrl *this = container_obj(layer);
return &this->res;
}
static void init_info(struct caif_payload_info *info, struct cfctrl *cfctrl)
{
info->hdr_len = 0;
info->channel_id = cfctrl->serv.layer.id;
info->dev_info = &cfctrl->serv.dev_info;
}
void cfctrl_enum_req(struct cflayer *layer, u8 physlinkid)
{
struct cfpkt *pkt;
struct cfctrl *cfctrl = container_obj(layer);
struct cflayer *dn = cfctrl->serv.layer.dn;
if (!dn) {
pr_debug("not able to send enum request\n");
return;
}
pkt = cfpkt_create(CFPKT_CTRL_PKT_LEN);
if (!pkt)
return;
caif_assert(offsetof(struct cfctrl, serv.layer) == 0);
init_info(cfpkt_info(pkt), cfctrl);
cfpkt_info(pkt)->dev_info->id = physlinkid;
cfctrl->serv.dev_info.id = physlinkid;
cfpkt_addbdy(pkt, CFCTRL_CMD_ENUM);
cfpkt_addbdy(pkt, physlinkid);
cfpkt_set_prio(pkt, TC_PRIO_CONTROL);
dn->transmit(dn, pkt);
}
int cfctrl_linkup_request(struct cflayer *layer,
struct cfctrl_link_param *param,
struct cflayer *user_layer)
{
struct cfctrl *cfctrl = container_obj(layer);
struct cflayer *dn = cfctrl->serv.layer.dn;
char utility_name[UTILITY_NAME_LENGTH];
struct cfctrl_request_info *req;
struct cfpkt *pkt;
u32 tmp32;
u16 tmp16;
u8 tmp8;
int ret;
if (!dn) {
pr_debug("not able to send linkup request\n");
return -ENODEV;
}
if (cfctrl_cancel_req(layer, user_layer) > 0) {
/* Slight Paranoia, check if already connecting */
pr_err("Duplicate connect request for same client\n");
WARN_ON(1);
return -EALREADY;
}
pkt = cfpkt_create(CFPKT_CTRL_PKT_LEN);
if (!pkt)
return -ENOMEM;
cfpkt_addbdy(pkt, CFCTRL_CMD_LINK_SETUP);
cfpkt_addbdy(pkt, (param->chtype << 4) | param->linktype);
cfpkt_addbdy(pkt, (param->priority << 3) | param->phyid);
cfpkt_addbdy(pkt, param->endpoint & 0x03);
switch (param->linktype) {
case CFCTRL_SRV_VEI:
break;
case CFCTRL_SRV_VIDEO:
cfpkt_addbdy(pkt, (u8) param->u.video.connid);
break;
case CFCTRL_SRV_DBG:
break;
case CFCTRL_SRV_DATAGRAM:
tmp32 = cpu_to_le32(param->u.datagram.connid);
cfpkt_add_body(pkt, &tmp32, 4);
break;
case CFCTRL_SRV_RFM:
/* Construct a frame, convert DatagramConnectionID to network
* format long and copy it out...
*/
tmp32 = cpu_to_le32(param->u.rfm.connid);
cfpkt_add_body(pkt, &tmp32, 4);
/* Add volume name, including zero termination... */
cfpkt_add_body(pkt, param->u.rfm.volume,
strlen(param->u.rfm.volume) + 1);
break;
case CFCTRL_SRV_UTIL:
tmp16 = cpu_to_le16(param->u.utility.fifosize_kb);
cfpkt_add_body(pkt, &tmp16, 2);
tmp16 = cpu_to_le16(param->u.utility.fifosize_bufs);
cfpkt_add_body(pkt, &tmp16, 2);
memset(utility_name, 0, sizeof(utility_name));
strscpy(utility_name, param->u.utility.name,
UTILITY_NAME_LENGTH);
cfpkt_add_body(pkt, utility_name, UTILITY_NAME_LENGTH);
tmp8 = param->u.utility.paramlen;
cfpkt_add_body(pkt, &tmp8, 1);
cfpkt_add_body(pkt, param->u.utility.params,
param->u.utility.paramlen);
break;
default:
pr_warn("Request setup of bad link type = %d\n",
param->linktype);
cfpkt_destroy(pkt);
return -EINVAL;
}
req = kzalloc(sizeof(*req), GFP_KERNEL);
if (!req) {
cfpkt_destroy(pkt);
return -ENOMEM;
}
req->client_layer = user_layer;
req->cmd = CFCTRL_CMD_LINK_SETUP;
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;
cfpkt_set_prio(pkt, TC_PRIO_CONTROL);
ret =
dn->transmit(dn, pkt);
if (ret < 0) {
int count;
count = cfctrl_cancel_req(&cfctrl->serv.layer,
user_layer);
if (count != 1) {
pr_err("Could not remove request (%d)", count);
return -ENODEV;
}
}
return 0;
}
int cfctrl_linkdown_req(struct cflayer *layer, u8 channelid,
struct cflayer *client)
{
int ret;
struct cfpkt *pkt;
struct cfctrl *cfctrl = container_obj(layer);
struct cflayer *dn = cfctrl->serv.layer.dn;
if (!dn) {
pr_debug("not able to send link-down request\n");
return -ENODEV;
}
pkt = cfpkt_create(CFPKT_CTRL_PKT_LEN);
if (!pkt)
return -ENOMEM;
cfpkt_addbdy(pkt, CFCTRL_CMD_LINK_DESTROY);
cfpkt_addbdy(pkt, channelid);
init_info(cfpkt_info(pkt), cfctrl);
cfpkt_set_prio(pkt, TC_PRIO_CONTROL);
ret =
dn->transmit(dn, pkt);
#ifndef CAIF_NO_LOOP
cfctrl->loop_linkused[channelid] = 0;
#endif
return ret;
}
int cfctrl_cancel_req(struct cflayer *layr, struct cflayer *adap_layer)
{
struct cfctrl_request_info *p, *tmp;
struct cfctrl *ctrl = container_obj(layr);
int found = 0;
spin_lock_bh(&ctrl->info_list_lock);
list_for_each_entry_safe(p, tmp, &ctrl->list, list) {
if (p->client_layer == adap_layer) {
list_del(&p->list);
kfree(p);
found++;
}
}
spin_unlock_bh(&ctrl->info_list_lock);
return found;
}
static int cfctrl_recv(struct cflayer *layer, struct cfpkt *pkt)
{
u8 cmdrsp;
u8 cmd;
int ret = -1;
u8 len;
u8 param[255];
u8 linkid = 0;
struct cfctrl *cfctrl = container_obj(layer);
struct cfctrl_request_info rsp, *req;
cmdrsp = cfpkt_extr_head_u8(pkt);
cmd = cmdrsp & CFCTRL_CMD_MASK;
if (cmd != CFCTRL_CMD_LINK_ERR
&& CFCTRL_RSP_BIT != (CFCTRL_RSP_BIT & cmdrsp)
&& CFCTRL_ERR_BIT != (CFCTRL_ERR_BIT & cmdrsp)) {
if (handle_loop(cfctrl, cmd, pkt) != 0)
cmdrsp |= CFCTRL_ERR_BIT;
}
switch (cmd) {
case CFCTRL_CMD_LINK_SETUP:
{
enum cfctrl_srv serv;
enum cfctrl_srv servtype;
u8 endpoint;
u8 physlinkid;
u8 prio;
u8 tmp;
u8 *cp;
int i;
struct cfctrl_link_param linkparam;
memset(&linkparam, 0, sizeof(linkparam));
tmp = cfpkt_extr_head_u8(pkt);
serv = tmp & CFCTRL_SRV_MASK;
linkparam.linktype = serv;
servtype = tmp >> 4;
linkparam.chtype = servtype;
tmp = cfpkt_extr_head_u8(pkt);
physlinkid = tmp & 0x07;
prio = tmp >> 3;
linkparam.priority = prio;
linkparam.phyid = physlinkid;
endpoint = cfpkt_extr_head_u8(pkt);
linkparam.endpoint = endpoint & 0x03;
switch (serv) {
case CFCTRL_SRV_VEI:
case CFCTRL_SRV_DBG:
if (CFCTRL_ERR_BIT & cmdrsp)
break;
/* Link ID */
linkid = cfpkt_extr_head_u8(pkt);
break;
case CFCTRL_SRV_VIDEO:
tmp = cfpkt_extr_head_u8(pkt);
linkparam.u.video.connid = tmp;
if (CFCTRL_ERR_BIT & cmdrsp)
break;
/* Link ID */
linkid = cfpkt_extr_head_u8(pkt);
break;
case CFCTRL_SRV_DATAGRAM:
linkparam.u.datagram.connid =
cfpkt_extr_head_u32(pkt);
if (CFCTRL_ERR_BIT & cmdrsp)
break;
/* Link ID */
linkid = cfpkt_extr_head_u8(pkt);
break;
case CFCTRL_SRV_RFM:
/* Construct a frame, convert
* DatagramConnectionID
* to network format long and copy it out...
*/
linkparam.u.rfm.connid =
cfpkt_extr_head_u32(pkt);
cp = (u8 *) linkparam.u.rfm.volume;
for (tmp = cfpkt_extr_head_u8(pkt);
cfpkt_more(pkt) && tmp != '\0';
tmp = cfpkt_extr_head_u8(pkt))
*cp++ = tmp;
*cp = '\0';
if (CFCTRL_ERR_BIT & cmdrsp)
break;
/* Link ID */
linkid = cfpkt_extr_head_u8(pkt);
break;
case CFCTRL_SRV_UTIL:
/* Construct a frame, convert
* DatagramConnectionID
* to network format long and copy it out...
*/
/* Fifosize KB */
linkparam.u.utility.fifosize_kb =
cfpkt_extr_head_u16(pkt);
/* Fifosize bufs */
linkparam.u.utility.fifosize_bufs =
cfpkt_extr_head_u16(pkt);
/* name */
cp = (u8 *) linkparam.u.utility.name;
caif_assert(sizeof(linkparam.u.utility.name)
>= UTILITY_NAME_LENGTH);
for (i = 0;
i < UTILITY_NAME_LENGTH
&& cfpkt_more(pkt); i++) {
tmp = cfpkt_extr_head_u8(pkt);
*cp++ = tmp;
}
/* Length */
len = cfpkt_extr_head_u8(pkt);
linkparam.u.utility.paramlen = len;
/* Param Data */
cp = linkparam.u.utility.params;
while (cfpkt_more(pkt) && len--) {
tmp = cfpkt_extr_head_u8(pkt);
*cp++ = tmp;
}
if (CFCTRL_ERR_BIT & cmdrsp)
break;
/* Link ID */
linkid = cfpkt_extr_head_u8(pkt);
/* Length */
len = cfpkt_extr_head_u8(pkt);
/* Param Data */
cfpkt_extr_head(pkt, ¶m, len);
break;
default:
pr_warn("Request setup, invalid type (%d)\n",
serv);
goto error;
}
rsp.cmd = cmd;
rsp.param = linkparam;
spin_lock_bh(&cfctrl->info_list_lock);
req = cfctrl_remove_req(cfctrl, &rsp);
if (CFCTRL_ERR_BIT == (CFCTRL_ERR_BIT & cmdrsp) ||
cfpkt_erroneous(pkt)) {
pr_err("Invalid O/E bit or parse error "
"on CAIF control channel\n");
cfctrl->res.reject_rsp(cfctrl->serv.layer.up,
0,
req ? req->client_layer
: NULL);
} else {
cfctrl->res.linksetup_rsp(cfctrl->serv.
layer.up, linkid,
serv, physlinkid,
req ? req->
client_layer : NULL);
}
kfree(req);
spin_unlock_bh(&cfctrl->info_list_lock);
}
break;
case CFCTRL_CMD_LINK_DESTROY:
linkid = cfpkt_extr_head_u8(pkt);
cfctrl->res.linkdestroy_rsp(cfctrl->serv.layer.up, linkid);
break;
case CFCTRL_CMD_LINK_ERR:
pr_err("Frame Error Indication received\n");
cfctrl->res.linkerror_ind();
break;
case CFCTRL_CMD_ENUM:
cfctrl->res.enum_rsp();
break;
case CFCTRL_CMD_SLEEP:
cfctrl->res.sleep_rsp();
break;
case CFCTRL_CMD_WAKE:
cfctrl->res.wake_rsp();
break;
case CFCTRL_CMD_LINK_RECONF:
cfctrl->res.restart_rsp();
break;
case CFCTRL_CMD_RADIO_SET:
cfctrl->res.radioset_rsp();
break;
default:
pr_err("Unrecognized Control Frame\n");
goto error;
}
ret = 0;
error:
cfpkt_destroy(pkt);
return ret;
}
static void cfctrl_ctrlcmd(struct cflayer *layr, enum caif_ctrlcmd ctrl,
int phyid)
{
struct cfctrl *this = container_obj(layr);
switch (ctrl) {
case _CAIF_CTRLCMD_PHYIF_FLOW_OFF_IND:
case CAIF_CTRLCMD_FLOW_OFF_IND:
spin_lock_bh(&this->info_list_lock);
if (!list_empty(&this->list))
pr_debug("Received flow off in control layer\n");
spin_unlock_bh(&this->info_list_lock);
break;
case _CAIF_CTRLCMD_PHYIF_DOWN_IND: {
struct cfctrl_request_info *p, *tmp;
/* Find all connect request and report failure */
spin_lock_bh(&this->info_list_lock);
list_for_each_entry_safe(p, tmp, &this->list, list) {
if (p->param.phyid == phyid) {
list_del(&p->list);
p->client_layer->ctrlcmd(p->client_layer,
CAIF_CTRLCMD_INIT_FAIL_RSP,
phyid);
kfree(p);
}
}
spin_unlock_bh(&this->info_list_lock);
break;
}
default:
break;
}
}
#ifndef CAIF_NO_LOOP
static int handle_loop(struct cfctrl *ctrl, int cmd, struct cfpkt *pkt)
{
static int last_linkid;
static int dec;
u8 linkid, linktype, tmp;
switch (cmd) {
case CFCTRL_CMD_LINK_SETUP:
spin_lock_bh(&ctrl->loop_linkid_lock);
if (!dec) {
for (linkid = last_linkid + 1; linkid < 254; linkid++)
if (!ctrl->loop_linkused[linkid])
goto found;
}
dec = 1;
for (linkid = last_linkid - 1; linkid > 1; linkid--)
if (!ctrl->loop_linkused[linkid])
goto found;
spin_unlock_bh(&ctrl->loop_linkid_lock);
return -1;
found:
if (linkid < 10)
dec = 0;
if (!ctrl->loop_linkused[linkid])
ctrl->loop_linkused[linkid] = 1;
last_linkid = linkid;
cfpkt_add_trail(pkt, &linkid, 1);
spin_unlock_bh(&ctrl->loop_linkid_lock);
cfpkt_peek_head(pkt, &linktype, 1);
if (linktype == CFCTRL_SRV_UTIL) {
tmp = 0x01;
cfpkt_add_trail(pkt, &tmp, 1);
cfpkt_add_trail(pkt, &tmp, 1);
}
break;
case CFCTRL_CMD_LINK_DESTROY:
spin_lock_bh(&ctrl->loop_linkid_lock);
cfpkt_peek_head(pkt, &linkid, 1);
ctrl->loop_linkused[linkid] = 0;
spin_unlock_bh(&ctrl->loop_linkid_lock);
break;
default:
break;
}
return 0;
}
#endif
