| /* |
| * Copyright (C) ST-Ericsson AB 2010 |
| * Author: Sjur Brendeland/sjur.brandeland@stericsson.com |
| * License terms: GNU General Public License (GPL) version 2 |
| */ |
| |
| #define pr_fmt(fmt) KBUILD_MODNAME ":%s(): " fmt, __func__ |
| |
| #include <linux/kernel.h> |
| #include <linux/stddef.h> |
| #include <linux/slab.h> |
| #include <linux/netdevice.h> |
| #include <linux/module.h> |
| #include <net/caif/caif_layer.h> |
| #include <net/caif/cfpkt.h> |
| #include <net/caif/cfcnfg.h> |
| #include <net/caif/cfctrl.h> |
| #include <net/caif/cfmuxl.h> |
| #include <net/caif/cffrml.h> |
| #include <net/caif/cfserl.h> |
| #include <net/caif/cfsrvl.h> |
| #include <net/caif/caif_dev.h> |
| |
| #define container_obj(layr) container_of(layr, struct cfcnfg, layer) |
| |
| /* Information about CAIF physical interfaces held by Config Module in order |
| * to manage physical interfaces |
| */ |
| struct cfcnfg_phyinfo { |
| struct list_head node; |
| bool up; |
| |
| /* Pointer to the layer below the MUX (framing layer) */ |
| struct cflayer *frm_layer; |
| /* Pointer to the lowest actual physical layer */ |
| struct cflayer *phy_layer; |
| /* Unique identifier of the physical interface */ |
| unsigned int id; |
| /* Preference of the physical in interface */ |
| enum cfcnfg_phy_preference pref; |
| |
| /* Information about the physical device */ |
| struct dev_info dev_info; |
| |
| /* Interface index */ |
| int ifindex; |
| |
| /* Protocol head room added for CAIF link layer */ |
| int head_room; |
| |
| /* Use Start of frame checksum */ |
| bool use_fcs; |
| }; |
| |
| struct cfcnfg { |
| struct cflayer layer; |
| struct cflayer *ctrl; |
| struct cflayer *mux; |
| struct list_head phys; |
| struct mutex lock; |
| }; |
| |
| 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); |
| static void cfcnfg_reject_rsp(struct cflayer *layer, u8 channel_id, |
| struct cflayer *adapt_layer); |
| static void cfctrl_resp_func(void); |
| static void cfctrl_enum_resp(void); |
| |
| struct cfcnfg *cfcnfg_create(void) |
| { |
| struct cfcnfg *this; |
| struct cfctrl_rsp *resp; |
| |
| might_sleep(); |
| |
| /* Initiate this layer */ |
| this = kzalloc(sizeof(struct cfcnfg), GFP_ATOMIC); |
| if (!this) |
| return NULL; |
| this->mux = cfmuxl_create(); |
| if (!this->mux) |
| goto out_of_mem; |
| this->ctrl = cfctrl_create(); |
| if (!this->ctrl) |
| goto out_of_mem; |
| /* Initiate response functions */ |
| resp = cfctrl_get_respfuncs(this->ctrl); |
| resp->enum_rsp = cfctrl_enum_resp; |
| resp->linkerror_ind = cfctrl_resp_func; |
| resp->linkdestroy_rsp = cfcnfg_linkdestroy_rsp; |
| resp->sleep_rsp = cfctrl_resp_func; |
| resp->wake_rsp = cfctrl_resp_func; |
| resp->restart_rsp = cfctrl_resp_func; |
| resp->radioset_rsp = cfctrl_resp_func; |
| resp->linksetup_rsp = cfcnfg_linkup_rsp; |
| resp->reject_rsp = cfcnfg_reject_rsp; |
| INIT_LIST_HEAD(&this->phys); |
| |
| cfmuxl_set_uplayer(this->mux, this->ctrl, 0); |
| layer_set_dn(this->ctrl, this->mux); |
| layer_set_up(this->ctrl, this); |
| mutex_init(&this->lock); |
| |
| return this; |
| out_of_mem: |
| synchronize_rcu(); |
| |
| kfree(this->mux); |
| kfree(this->ctrl); |
| kfree(this); |
| return NULL; |
| } |
| |
| void cfcnfg_remove(struct cfcnfg *cfg) |
| { |
| might_sleep(); |
| if (cfg) { |
| synchronize_rcu(); |
| |
| kfree(cfg->mux); |
| cfctrl_remove(cfg->ctrl); |
| kfree(cfg); |
| } |
| } |
| |
| static void cfctrl_resp_func(void) |
| { |
| } |
| |
| static struct cfcnfg_phyinfo *cfcnfg_get_phyinfo_rcu(struct cfcnfg *cnfg, |
| u8 phyid) |
| { |
| struct cfcnfg_phyinfo *phy; |
| |
| list_for_each_entry_rcu(phy, &cnfg->phys, node) |
| if (phy->id == phyid) |
| return phy; |
| return NULL; |
| } |
| |
| static void cfctrl_enum_resp(void) |
| { |
| } |
| |
| static struct dev_info *cfcnfg_get_phyid(struct cfcnfg *cnfg, |
| enum cfcnfg_phy_preference phy_pref) |
| { |
| /* Try to match with specified preference */ |
| struct cfcnfg_phyinfo *phy; |
| |
| list_for_each_entry_rcu(phy, &cnfg->phys, node) { |
| if (phy->up && phy->pref == phy_pref && |
| phy->frm_layer != NULL) |
| |
| return &phy->dev_info; |
| } |
| |
| /* Otherwise just return something */ |
| list_for_each_entry_rcu(phy, &cnfg->phys, node) |
| if (phy->up) |
| return &phy->dev_info; |
| |
| return NULL; |
| } |
| |
| static int cfcnfg_get_id_from_ifi(struct cfcnfg *cnfg, int ifi) |
| { |
| struct cfcnfg_phyinfo *phy; |
| |
| list_for_each_entry_rcu(phy, &cnfg->phys, node) |
| if (phy->ifindex == ifi && phy->up) |
| return phy->id; |
| return -ENODEV; |
| } |
| |
| int caif_disconnect_client(struct net *net, struct cflayer *adap_layer) |
| { |
| u8 channel_id; |
| struct cfcnfg *cfg = get_cfcnfg(net); |
| |
| caif_assert(adap_layer != NULL); |
| cfctrl_cancel_req(cfg->ctrl, adap_layer); |
| channel_id = adap_layer->id; |
| if (channel_id != 0) { |
| struct cflayer *servl; |
| servl = cfmuxl_remove_uplayer(cfg->mux, channel_id); |
| cfctrl_linkdown_req(cfg->ctrl, channel_id, adap_layer); |
| if (servl != NULL) |
| layer_set_up(servl, NULL); |
| } else |
| pr_debug("nothing to disconnect\n"); |
| |
| /* Do RCU sync before initiating cleanup */ |
| synchronize_rcu(); |
| if (adap_layer->ctrlcmd != NULL) |
| adap_layer->ctrlcmd(adap_layer, CAIF_CTRLCMD_DEINIT_RSP, 0); |
| return 0; |
| |
| } |
| EXPORT_SYMBOL(caif_disconnect_client); |
| |
| static void cfcnfg_linkdestroy_rsp(struct cflayer *layer, u8 channel_id) |
| { |
| } |
| |
| static const int protohead[CFCTRL_SRV_MASK] = { |
| [CFCTRL_SRV_VEI] = 4, |
| [CFCTRL_SRV_DATAGRAM] = 7, |
| [CFCTRL_SRV_UTIL] = 4, |
| [CFCTRL_SRV_RFM] = 3, |
| [CFCTRL_SRV_DBG] = 3, |
| }; |
| |
| |
| static int caif_connect_req_to_link_param(struct cfcnfg *cnfg, |
| struct caif_connect_request *s, |
| struct cfctrl_link_param *l) |
| { |
| struct dev_info *dev_info; |
| enum cfcnfg_phy_preference pref; |
| int res; |
| |
| memset(l, 0, sizeof(*l)); |
| /* In caif protocol low value is high priority */ |
| l->priority = CAIF_PRIO_MAX - s->priority + 1; |
| |
| if (s->ifindex != 0) { |
| res = cfcnfg_get_id_from_ifi(cnfg, s->ifindex); |
| if (res < 0) |
| return res; |
| l->phyid = res; |
| } else { |
| switch (s->link_selector) { |
| case CAIF_LINK_HIGH_BANDW: |
| pref = CFPHYPREF_HIGH_BW; |
| break; |
| case CAIF_LINK_LOW_LATENCY: |
| pref = CFPHYPREF_LOW_LAT; |
| break; |
| default: |
| return -EINVAL; |
| } |
| dev_info = cfcnfg_get_phyid(cnfg, pref); |
| if (dev_info == NULL) |
| return -ENODEV; |
| l->phyid = dev_info->id; |
| } |
| switch (s->protocol) { |
| case CAIFPROTO_AT: |
| l->linktype = CFCTRL_SRV_VEI; |
| l->endpoint = (s->sockaddr.u.at.type >> 2) & 0x3; |
| l->chtype = s->sockaddr.u.at.type & 0x3; |
| break; |
| case CAIFPROTO_DATAGRAM: |
| l->linktype = CFCTRL_SRV_DATAGRAM; |
| l->chtype = 0x00; |
| l->u.datagram.connid = s->sockaddr.u.dgm.connection_id; |
| break; |
| case CAIFPROTO_DATAGRAM_LOOP: |
| l->linktype = CFCTRL_SRV_DATAGRAM; |
| l->chtype = 0x03; |
| l->endpoint = 0x00; |
| l->u.datagram.connid = s->sockaddr.u.dgm.connection_id; |
| break; |
| case CAIFPROTO_RFM: |
| l->linktype = CFCTRL_SRV_RFM; |
| l->u.datagram.connid = s->sockaddr.u.rfm.connection_id; |
| strncpy(l->u.rfm.volume, s->sockaddr.u.rfm.volume, |
| sizeof(l->u.rfm.volume)-1); |
| l->u.rfm.volume[sizeof(l->u.rfm.volume)-1] = 0; |
| break; |
| case CAIFPROTO_UTIL: |
| l->linktype = CFCTRL_SRV_UTIL; |
| l->endpoint = 0x00; |
| l->chtype = 0x00; |
| strncpy(l->u.utility.name, s->sockaddr.u.util.service, |
| sizeof(l->u.utility.name)-1); |
| l->u.utility.name[sizeof(l->u.utility.name)-1] = 0; |
| caif_assert(sizeof(l->u.utility.name) > 10); |
| l->u.utility.paramlen = s->param.size; |
| if (l->u.utility.paramlen > sizeof(l->u.utility.params)) |
| l->u.utility.paramlen = sizeof(l->u.utility.params); |
| |
| memcpy(l->u.utility.params, s->param.data, |
| l->u.utility.paramlen); |
| |
| break; |
| case CAIFPROTO_DEBUG: |
| l->linktype = CFCTRL_SRV_DBG; |
| l->endpoint = s->sockaddr.u.dbg.service; |
| l->chtype = s->sockaddr.u.dbg.type; |
| break; |
| default: |
| return -EINVAL; |
| } |
| return 0; |
| } |
| |
| int caif_connect_client(struct net *net, struct caif_connect_request *conn_req, |
| struct cflayer *adap_layer, int *ifindex, |
| int *proto_head, int *proto_tail) |
| { |
| struct cflayer *frml; |
| struct cfcnfg_phyinfo *phy; |
| int err; |
| struct cfctrl_link_param param; |
| struct cfcnfg *cfg = get_cfcnfg(net); |
| |
| rcu_read_lock(); |
| err = caif_connect_req_to_link_param(cfg, conn_req, ¶m); |
| if (err) |
| goto unlock; |
| |
| phy = cfcnfg_get_phyinfo_rcu(cfg, param.phyid); |
| if (!phy) { |
| err = -ENODEV; |
| goto unlock; |
| } |
| err = -EINVAL; |
| |
| if (adap_layer == NULL) { |
| pr_err("adap_layer is zero\n"); |
| goto unlock; |
| } |
| if (adap_layer->receive == NULL) { |
| pr_err("adap_layer->receive is NULL\n"); |
| goto unlock; |
| } |
| if (adap_layer->ctrlcmd == NULL) { |
| pr_err("adap_layer->ctrlcmd == NULL\n"); |
| goto unlock; |
| } |
| |
| err = -ENODEV; |
| frml = phy->frm_layer; |
| if (frml == NULL) { |
| pr_err("Specified PHY type does not exist!\n"); |
| goto unlock; |
| } |
| caif_assert(param.phyid == phy->id); |
| caif_assert(phy->frm_layer->id == |
| param.phyid); |
| caif_assert(phy->phy_layer->id == |
| param.phyid); |
| |
| *ifindex = phy->ifindex; |
| *proto_tail = 2; |
| *proto_head = protohead[param.linktype] + phy->head_room; |
| |
| rcu_read_unlock(); |
| |
| /* FIXME: ENUMERATE INITIALLY WHEN ACTIVATING PHYSICAL INTERFACE */ |
| cfctrl_enum_req(cfg->ctrl, param.phyid); |
| return cfctrl_linkup_request(cfg->ctrl, ¶m, adap_layer); |
| |
| unlock: |
| rcu_read_unlock(); |
| return err; |
| } |
| EXPORT_SYMBOL(caif_connect_client); |
| |
| static void cfcnfg_reject_rsp(struct cflayer *layer, u8 channel_id, |
| struct cflayer *adapt_layer) |
| { |
| if (adapt_layer != NULL && adapt_layer->ctrlcmd != NULL) |
| adapt_layer->ctrlcmd(adapt_layer, |
| CAIF_CTRLCMD_INIT_FAIL_RSP, 0); |
| } |
| |
| static void |
| cfcnfg_linkup_rsp(struct cflayer *layer, u8 channel_id, enum cfctrl_srv serv, |
| u8 phyid, struct cflayer *adapt_layer) |
| { |
| struct cfcnfg *cnfg = container_obj(layer); |
| struct cflayer *servicel = NULL; |
| struct cfcnfg_phyinfo *phyinfo; |
| struct net_device *netdev; |
| |
| if (channel_id == 0) { |
| pr_warn("received channel_id zero\n"); |
| if (adapt_layer != NULL && adapt_layer->ctrlcmd != NULL) |
| adapt_layer->ctrlcmd(adapt_layer, |
| CAIF_CTRLCMD_INIT_FAIL_RSP, 0); |
| return; |
| } |
| |
| rcu_read_lock(); |
| |
| if (adapt_layer == NULL) { |
| pr_debug("link setup response but no client exist," |
| "send linkdown back\n"); |
| cfctrl_linkdown_req(cnfg->ctrl, channel_id, NULL); |
| goto unlock; |
| } |
| |
| caif_assert(cnfg != NULL); |
| caif_assert(phyid != 0); |
| |
| phyinfo = cfcnfg_get_phyinfo_rcu(cnfg, phyid); |
| if (phyinfo == NULL) { |
| pr_err("ERROR: Link Layer Device disappeared" |
| "while connecting\n"); |
| goto unlock; |
| } |
| |
| caif_assert(phyinfo != NULL); |
| caif_assert(phyinfo->id == phyid); |
| caif_assert(phyinfo->phy_layer != NULL); |
| caif_assert(phyinfo->phy_layer->id == phyid); |
| |
| adapt_layer->id = channel_id; |
| |
| switch (serv) { |
| case CFCTRL_SRV_VEI: |
| servicel = cfvei_create(channel_id, &phyinfo->dev_info); |
| break; |
| case CFCTRL_SRV_DATAGRAM: |
| servicel = cfdgml_create(channel_id, |
| &phyinfo->dev_info); |
| break; |
| case CFCTRL_SRV_RFM: |
| netdev = phyinfo->dev_info.dev; |
| servicel = cfrfml_create(channel_id, &phyinfo->dev_info, |
| netdev->mtu); |
| break; |
| case CFCTRL_SRV_UTIL: |
| servicel = cfutill_create(channel_id, &phyinfo->dev_info); |
| break; |
| case CFCTRL_SRV_VIDEO: |
| servicel = cfvidl_create(channel_id, &phyinfo->dev_info); |
| break; |
| case CFCTRL_SRV_DBG: |
| servicel = cfdbgl_create(channel_id, &phyinfo->dev_info); |
| break; |
| default: |
| pr_err("Protocol error. Link setup response " |
| "- unknown channel type\n"); |
| goto unlock; |
| } |
| if (!servicel) |
| goto unlock; |
| layer_set_dn(servicel, cnfg->mux); |
| cfmuxl_set_uplayer(cnfg->mux, servicel, channel_id); |
| layer_set_up(servicel, adapt_layer); |
| layer_set_dn(adapt_layer, servicel); |
| |
| rcu_read_unlock(); |
| |
| servicel->ctrlcmd(servicel, CAIF_CTRLCMD_INIT_RSP, 0); |
| return; |
| unlock: |
| rcu_read_unlock(); |
| } |
| |
| void |
| cfcnfg_add_phy_layer(struct cfcnfg *cnfg, |
| struct net_device *dev, struct cflayer *phy_layer, |
| enum cfcnfg_phy_preference pref, |
| struct cflayer *link_support, |
| bool fcs, int head_room) |
| { |
| struct cflayer *frml; |
| struct cfcnfg_phyinfo *phyinfo = NULL; |
| int i; |
| u8 phyid; |
| |
| mutex_lock(&cnfg->lock); |
| |
| /* CAIF protocol allow maximum 6 link-layers */ |
| for (i = 0; i < 7; i++) { |
| phyid = (dev->ifindex + i) & 0x7; |
| if (phyid == 0) |
| continue; |
| if (cfcnfg_get_phyinfo_rcu(cnfg, phyid) == NULL) |
| goto got_phyid; |
| } |
| pr_warn("Too many CAIF Link Layers (max 6)\n"); |
| goto out; |
| |
| got_phyid: |
| phyinfo = kzalloc(sizeof(struct cfcnfg_phyinfo), GFP_ATOMIC); |
| if (!phyinfo) |
| goto out_err; |
| |
| phy_layer->id = phyid; |
| phyinfo->pref = pref; |
| phyinfo->id = phyid; |
| phyinfo->dev_info.id = phyid; |
| phyinfo->dev_info.dev = dev; |
| phyinfo->phy_layer = phy_layer; |
| phyinfo->ifindex = dev->ifindex; |
| phyinfo->head_room = head_room; |
| phyinfo->use_fcs = fcs; |
| |
| frml = cffrml_create(phyid, fcs); |
| |
| if (!frml) |
| goto out_err; |
| phyinfo->frm_layer = frml; |
| layer_set_up(frml, cnfg->mux); |
| |
| if (link_support != NULL) { |
| link_support->id = phyid; |
| layer_set_dn(frml, link_support); |
| layer_set_up(link_support, frml); |
| layer_set_dn(link_support, phy_layer); |
| layer_set_up(phy_layer, link_support); |
| } else { |
| layer_set_dn(frml, phy_layer); |
| layer_set_up(phy_layer, frml); |
| } |
| |
| list_add_rcu(&phyinfo->node, &cnfg->phys); |
| out: |
| mutex_unlock(&cnfg->lock); |
| return; |
| |
| out_err: |
| kfree(phyinfo); |
| mutex_unlock(&cnfg->lock); |
| } |
| EXPORT_SYMBOL(cfcnfg_add_phy_layer); |
| |
| int cfcnfg_set_phy_state(struct cfcnfg *cnfg, struct cflayer *phy_layer, |
| bool up) |
| { |
| struct cfcnfg_phyinfo *phyinfo; |
| |
| rcu_read_lock(); |
| phyinfo = cfcnfg_get_phyinfo_rcu(cnfg, phy_layer->id); |
| if (phyinfo == NULL) { |
| rcu_read_unlock(); |
| return -ENODEV; |
| } |
| |
| if (phyinfo->up == up) { |
| rcu_read_unlock(); |
| return 0; |
| } |
| phyinfo->up = up; |
| |
| if (up) { |
| cffrml_hold(phyinfo->frm_layer); |
| cfmuxl_set_dnlayer(cnfg->mux, phyinfo->frm_layer, |
| phy_layer->id); |
| } else { |
| cfmuxl_remove_dnlayer(cnfg->mux, phy_layer->id); |
| cffrml_put(phyinfo->frm_layer); |
| } |
| |
| rcu_read_unlock(); |
| return 0; |
| } |
| EXPORT_SYMBOL(cfcnfg_set_phy_state); |
| |
| int cfcnfg_del_phy_layer(struct cfcnfg *cnfg, struct cflayer *phy_layer) |
| { |
| struct cflayer *frml, *frml_dn; |
| u16 phyid; |
| struct cfcnfg_phyinfo *phyinfo; |
| |
| might_sleep(); |
| |
| mutex_lock(&cnfg->lock); |
| |
| phyid = phy_layer->id; |
| phyinfo = cfcnfg_get_phyinfo_rcu(cnfg, phyid); |
| |
| if (phyinfo == NULL) { |
| mutex_unlock(&cnfg->lock); |
| return 0; |
| } |
| caif_assert(phyid == phyinfo->id); |
| caif_assert(phy_layer == phyinfo->phy_layer); |
| caif_assert(phy_layer->id == phyid); |
| caif_assert(phyinfo->frm_layer->id == phyid); |
| |
| list_del_rcu(&phyinfo->node); |
| synchronize_rcu(); |
| |
| /* Fail if reference count is not zero */ |
| if (cffrml_refcnt_read(phyinfo->frm_layer) != 0) { |
| pr_info("Wait for device inuse\n"); |
| list_add_rcu(&phyinfo->node, &cnfg->phys); |
| mutex_unlock(&cnfg->lock); |
| return -EAGAIN; |
| } |
| |
| frml = phyinfo->frm_layer; |
| frml_dn = frml->dn; |
| cffrml_set_uplayer(frml, NULL); |
| cffrml_set_dnlayer(frml, NULL); |
| if (phy_layer != frml_dn) { |
| layer_set_up(frml_dn, NULL); |
| layer_set_dn(frml_dn, NULL); |
| } |
| layer_set_up(phy_layer, NULL); |
| |
| if (phyinfo->phy_layer != frml_dn) |
| kfree(frml_dn); |
| |
| cffrml_free(frml); |
| kfree(phyinfo); |
| mutex_unlock(&cnfg->lock); |
| |
| return 0; |
| } |
| EXPORT_SYMBOL(cfcnfg_del_phy_layer); |