268 lines
6.3 KiB
C
268 lines
6.3 KiB
C
/*
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* Copyright (C) ST-Ericsson AB 2010
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* Author: Sjur Brendeland
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* License terms: GNU General Public License (GPL) version 2
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ":%s(): " fmt, __func__
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#include <linux/stddef.h>
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#include <linux/spinlock.h>
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#include <linux/slab.h>
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#include <linux/rculist.h>
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#include <net/caif/cfpkt.h>
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#include <net/caif/cfmuxl.h>
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#include <net/caif/cfsrvl.h>
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#include <net/caif/cffrml.h>
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#define container_obj(layr) container_of(layr, struct cfmuxl, layer)
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#define CAIF_CTRL_CHANNEL 0
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#define UP_CACHE_SIZE 8
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#define DN_CACHE_SIZE 8
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struct cfmuxl {
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struct cflayer layer;
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struct list_head srvl_list;
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struct list_head frml_list;
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struct cflayer *up_cache[UP_CACHE_SIZE];
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struct cflayer *dn_cache[DN_CACHE_SIZE];
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/*
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* Set when inserting or removing downwards layers.
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*/
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spinlock_t transmit_lock;
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/*
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* Set when inserting or removing upwards layers.
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*/
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spinlock_t receive_lock;
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};
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static int cfmuxl_receive(struct cflayer *layr, struct cfpkt *pkt);
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static int cfmuxl_transmit(struct cflayer *layr, struct cfpkt *pkt);
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static void cfmuxl_ctrlcmd(struct cflayer *layr, enum caif_ctrlcmd ctrl,
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int phyid);
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static struct cflayer *get_up(struct cfmuxl *muxl, u16 id);
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struct cflayer *cfmuxl_create(void)
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{
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struct cfmuxl *this = kzalloc(sizeof(struct cfmuxl), GFP_ATOMIC);
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if (!this)
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return NULL;
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this->layer.receive = cfmuxl_receive;
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this->layer.transmit = cfmuxl_transmit;
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this->layer.ctrlcmd = cfmuxl_ctrlcmd;
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INIT_LIST_HEAD(&this->srvl_list);
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INIT_LIST_HEAD(&this->frml_list);
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spin_lock_init(&this->transmit_lock);
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spin_lock_init(&this->receive_lock);
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snprintf(this->layer.name, CAIF_LAYER_NAME_SZ, "mux");
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return &this->layer;
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}
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int cfmuxl_set_dnlayer(struct cflayer *layr, struct cflayer *dn, u8 phyid)
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{
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struct cfmuxl *muxl = (struct cfmuxl *) layr;
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spin_lock_bh(&muxl->transmit_lock);
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list_add_rcu(&dn->node, &muxl->frml_list);
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spin_unlock_bh(&muxl->transmit_lock);
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return 0;
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}
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static struct cflayer *get_from_id(struct list_head *list, u16 id)
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{
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struct cflayer *lyr;
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list_for_each_entry_rcu(lyr, list, node) {
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if (lyr->id == id)
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return lyr;
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}
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return NULL;
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}
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int cfmuxl_set_uplayer(struct cflayer *layr, struct cflayer *up, u8 linkid)
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{
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struct cfmuxl *muxl = container_obj(layr);
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struct cflayer *old;
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spin_lock_bh(&muxl->receive_lock);
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/* Two entries with same id is wrong, so remove old layer from mux */
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old = get_from_id(&muxl->srvl_list, linkid);
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if (old != NULL)
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list_del_rcu(&old->node);
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list_add_rcu(&up->node, &muxl->srvl_list);
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spin_unlock_bh(&muxl->receive_lock);
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return 0;
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}
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struct cflayer *cfmuxl_remove_dnlayer(struct cflayer *layr, u8 phyid)
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{
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struct cfmuxl *muxl = container_obj(layr);
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struct cflayer *dn;
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int idx = phyid % DN_CACHE_SIZE;
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spin_lock_bh(&muxl->transmit_lock);
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RCU_INIT_POINTER(muxl->dn_cache[idx], NULL);
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dn = get_from_id(&muxl->frml_list, phyid);
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if (dn == NULL)
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goto out;
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list_del_rcu(&dn->node);
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caif_assert(dn != NULL);
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out:
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spin_unlock_bh(&muxl->transmit_lock);
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return dn;
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}
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static struct cflayer *get_up(struct cfmuxl *muxl, u16 id)
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{
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struct cflayer *up;
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int idx = id % UP_CACHE_SIZE;
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up = rcu_dereference(muxl->up_cache[idx]);
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if (up == NULL || up->id != id) {
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spin_lock_bh(&muxl->receive_lock);
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up = get_from_id(&muxl->srvl_list, id);
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rcu_assign_pointer(muxl->up_cache[idx], up);
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spin_unlock_bh(&muxl->receive_lock);
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}
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return up;
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}
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static struct cflayer *get_dn(struct cfmuxl *muxl, struct dev_info *dev_info)
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{
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struct cflayer *dn;
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int idx = dev_info->id % DN_CACHE_SIZE;
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dn = rcu_dereference(muxl->dn_cache[idx]);
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if (dn == NULL || dn->id != dev_info->id) {
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spin_lock_bh(&muxl->transmit_lock);
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dn = get_from_id(&muxl->frml_list, dev_info->id);
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rcu_assign_pointer(muxl->dn_cache[idx], dn);
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spin_unlock_bh(&muxl->transmit_lock);
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}
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return dn;
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}
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struct cflayer *cfmuxl_remove_uplayer(struct cflayer *layr, u8 id)
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{
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struct cflayer *up;
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struct cfmuxl *muxl = container_obj(layr);
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int idx = id % UP_CACHE_SIZE;
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if (id == 0) {
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pr_warn("Trying to remove control layer\n");
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return NULL;
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}
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spin_lock_bh(&muxl->receive_lock);
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up = get_from_id(&muxl->srvl_list, id);
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if (up == NULL)
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goto out;
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RCU_INIT_POINTER(muxl->up_cache[idx], NULL);
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list_del_rcu(&up->node);
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out:
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spin_unlock_bh(&muxl->receive_lock);
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return up;
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}
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static int cfmuxl_receive(struct cflayer *layr, struct cfpkt *pkt)
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{
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int ret;
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struct cfmuxl *muxl = container_obj(layr);
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u8 id;
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struct cflayer *up;
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if (cfpkt_extr_head(pkt, &id, 1) < 0) {
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pr_err("erroneous Caif Packet\n");
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cfpkt_destroy(pkt);
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return -EPROTO;
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}
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rcu_read_lock();
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up = get_up(muxl, id);
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if (up == NULL) {
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pr_debug("Received data on unknown link ID = %d (0x%x)"
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" up == NULL", id, id);
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cfpkt_destroy(pkt);
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/*
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* Don't return ERROR, since modem misbehaves and sends out
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* flow on before linksetup response.
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*/
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rcu_read_unlock();
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return /* CFGLU_EPROT; */ 0;
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}
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/* We can't hold rcu_lock during receive, so take a ref count instead */
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cfsrvl_get(up);
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rcu_read_unlock();
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ret = up->receive(up, pkt);
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cfsrvl_put(up);
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return ret;
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}
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static int cfmuxl_transmit(struct cflayer *layr, struct cfpkt *pkt)
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{
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struct cfmuxl *muxl = container_obj(layr);
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int err;
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u8 linkid;
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struct cflayer *dn;
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struct caif_payload_info *info = cfpkt_info(pkt);
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BUG_ON(!info);
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rcu_read_lock();
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dn = get_dn(muxl, info->dev_info);
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if (dn == NULL) {
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pr_debug("Send data on unknown phy ID = %d (0x%x)\n",
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info->dev_info->id, info->dev_info->id);
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rcu_read_unlock();
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cfpkt_destroy(pkt);
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return -ENOTCONN;
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}
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info->hdr_len += 1;
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linkid = info->channel_id;
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cfpkt_add_head(pkt, &linkid, 1);
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/* We can't hold rcu_lock during receive, so take a ref count instead */
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cffrml_hold(dn);
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rcu_read_unlock();
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err = dn->transmit(dn, pkt);
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cffrml_put(dn);
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return err;
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}
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static void cfmuxl_ctrlcmd(struct cflayer *layr, enum caif_ctrlcmd ctrl,
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int phyid)
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{
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struct cfmuxl *muxl = container_obj(layr);
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struct cflayer *layer;
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rcu_read_lock();
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list_for_each_entry_rcu(layer, &muxl->srvl_list, node) {
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if (cfsrvl_phyid_match(layer, phyid) && layer->ctrlcmd) {
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if ((ctrl == _CAIF_CTRLCMD_PHYIF_DOWN_IND ||
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ctrl == CAIF_CTRLCMD_REMOTE_SHUTDOWN_IND) &&
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layer->id != 0)
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cfmuxl_remove_uplayer(layr, layer->id);
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/* NOTE: ctrlcmd is not allowed to block */
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layer->ctrlcmd(layer, ctrl, phyid);
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}
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}
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rcu_read_unlock();
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}
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