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-rw-r--r--net/caif/cfcnfg.c612
1 files changed, 612 insertions, 0 deletions
diff --git a/net/caif/cfcnfg.c b/net/caif/cfcnfg.c
new file mode 100644
index 000000000..52509e185
--- /dev/null
+++ b/net/caif/cfcnfg.c
@@ -0,0 +1,612 @@
+// 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/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;
+ strscpy(l->u.rfm.volume, s->sockaddr.u.rfm.volume,
+ sizeof(l->u.rfm.volume));
+ break;
+ case CAIFPROTO_UTIL:
+ l->linktype = CFCTRL_SRV_UTIL;
+ l->endpoint = 0x00;
+ l->chtype = 0x00;
+ strscpy(l->u.utility.name, s->sockaddr.u.util.service,
+ sizeof(l->u.utility.name));
+ 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, &param);
+ 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, &param, 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();
+}
+
+int
+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, res = 0;
+ 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");
+ res = -EEXIST;
+ goto out;
+
+got_phyid:
+ phyinfo = kzalloc(sizeof(struct cfcnfg_phyinfo), GFP_ATOMIC);
+ if (!phyinfo) {
+ res = -ENOMEM;
+ goto out;
+ }
+
+ 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) {
+ res = -ENOMEM;
+ 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 res;
+
+out_err:
+ kfree(phyinfo);
+ mutex_unlock(&cnfg->lock);
+ return res;
+}
+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);
generated by cgit v1.2.3 (git 2.39.1) at 2024-05-24 15:14:03 +0000