net-caif: add CAIF generic caif support functions
authorSjur Braendeland <sjur.brandeland@stericsson.com>
Tue, 30 Mar 2010 13:56:24 +0000 (13:56 +0000)
committerDavid S. Miller <davem@davemloft.net>
Wed, 31 Mar 2010 02:08:47 +0000 (19:08 -0700)
Support functions for the caif protocol stack:
cfcnfg.c        - CAIF Configuration Module used for
                  adding and removing drivers and connection
cfpkt_skbuff.c  - CAIF Packet layer (SKB helper functions)

Signed-off-by: Sjur Braendeland <sjur.brandeland@stericsson.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
net/caif/cfcnfg.c [new file with mode: 0644]
net/caif/cfpkt_skbuff.c [new file with mode: 0644]

diff --git a/net/caif/cfcnfg.c b/net/caif/cfcnfg.c
new file mode 100644 (file)
index 0000000..70a733d
--- /dev/null
@@ -0,0 +1,529 @@
+/*
+ * Copyright (C) ST-Ericsson AB 2010
+ * Author:     Sjur Brendeland/sjur.brandeland@stericsson.com
+ * License terms: GNU General Public License (GPL) version 2
+ */
+#include <linux/kernel.h>
+#include <linux/stddef.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 <linux/module.h>
+#include <asm/atomic.h>
+
+#define MAX_PHY_LAYERS 7
+#define PHY_NAME_LEN 20
+
+#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 {
+       /* 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;
+
+       /* Reference count, number of channels using the device */
+       int phy_ref_count;
+
+       /* Information about the physical device */
+       struct dev_info dev_info;
+};
+
+struct cfcnfg {
+       struct cflayer layer;
+       struct cflayer *ctrl;
+       struct cflayer *mux;
+       u8 last_phyid;
+       struct cfcnfg_phyinfo phy_layers[MAX_PHY_LAYERS];
+};
+
+static void cncfg_linkup_rsp(struct cflayer *layer, u8 linkid,
+                            enum cfctrl_srv serv, u8 phyid,
+                            struct cflayer *adapt_layer);
+static void cncfg_linkdestroy_rsp(struct cflayer *layer, u8 linkid,
+                                 struct cflayer *client_layer);
+static void cncfg_reject_rsp(struct cflayer *layer, u8 linkid,
+                            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;
+       /* Initiate this layer */
+       this = kmalloc(sizeof(struct cfcnfg), GFP_ATOMIC);
+       if (!this) {
+               pr_warning("CAIF: %s(): Out of memory\n", __func__);
+               return NULL;
+       }
+       memset(this, 0, sizeof(struct cfcnfg));
+       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 = cncfg_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 = cncfg_linkup_rsp;
+       resp->reject_rsp = cncfg_reject_rsp;
+
+       this->last_phyid = 1;
+
+       cfmuxl_set_uplayer(this->mux, this->ctrl, 0);
+       layer_set_dn(this->ctrl, this->mux);
+       layer_set_up(this->ctrl, this);
+       return this;
+out_of_mem:
+       pr_warning("CAIF: %s(): Out of memory\n", __func__);
+       kfree(this->mux);
+       kfree(this->ctrl);
+       kfree(this);
+       return NULL;
+}
+EXPORT_SYMBOL(cfcnfg_create);
+
+void cfcnfg_remove(struct cfcnfg *cfg)
+{
+       if (cfg) {
+               kfree(cfg->mux);
+               kfree(cfg->ctrl);
+               kfree(cfg);
+       }
+}
+
+static void cfctrl_resp_func(void)
+{
+}
+
+static void cfctrl_enum_resp(void)
+{
+}
+
+struct dev_info *cfcnfg_get_phyid(struct cfcnfg *cnfg,
+                                 enum cfcnfg_phy_preference phy_pref)
+{
+       u16 i;
+
+       /* Try to match with specified preference */
+       for (i = 1; i < MAX_PHY_LAYERS; i++) {
+               if (cnfg->phy_layers[i].id == i &&
+                    cnfg->phy_layers[i].pref == phy_pref &&
+                    cnfg->phy_layers[i].frm_layer != NULL) {
+                       caif_assert(cnfg->phy_layers != NULL);
+                       caif_assert(cnfg->phy_layers[i].id == i);
+                       return &cnfg->phy_layers[i].dev_info;
+               }
+       }
+       /* Otherwise just return something */
+       for (i = 1; i < MAX_PHY_LAYERS; i++) {
+               if (cnfg->phy_layers[i].id == i) {
+                       caif_assert(cnfg->phy_layers != NULL);
+                       caif_assert(cnfg->phy_layers[i].id == i);
+                       return &cnfg->phy_layers[i].dev_info;
+               }
+       }
+
+       return NULL;
+}
+
+static struct cfcnfg_phyinfo *cfcnfg_get_phyinfo(struct cfcnfg *cnfg,
+                                                       u8 phyid)
+{
+       int i;
+       /* Try to match with specified preference */
+       for (i = 0; i < MAX_PHY_LAYERS; i++)
+               if (cnfg->phy_layers[i].frm_layer != NULL &&
+                   cnfg->phy_layers[i].id == phyid)
+                       return &cnfg->phy_layers[i];
+       return NULL;
+}
+
+int cfcnfg_get_named(struct cfcnfg *cnfg, char *name)
+{
+       int i;
+
+       /* Try to match with specified name */
+       for (i = 0; i < MAX_PHY_LAYERS; i++) {
+               if (cnfg->phy_layers[i].frm_layer != NULL
+                   && strcmp(cnfg->phy_layers[i].phy_layer->name,
+                             name) == 0)
+                       return cnfg->phy_layers[i].frm_layer->id;
+       }
+       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_del_adapt_layer(struct cfcnfg *cnfg, struct cflayer *adap_layer)
+{
+       u8 channel_id = 0;
+       int ret = 0;
+       struct cfcnfg_phyinfo *phyinfo = NULL;
+       u8 phyid = 0;
+
+       caif_assert(adap_layer != NULL);
+       channel_id = adap_layer->id;
+       if (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;
+               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__);
+               ret = -EINVAL;
+               goto end;
+       }
+
+       ret = cfctrl_linkdown_req(cnfg->ctrl, channel_id, adap_layer);
+
+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);
+       }
+       return ret;
+
+}
+EXPORT_SYMBOL(cfcnfg_del_adapt_layer);
+
+static void cncfg_linkdestroy_rsp(struct cflayer *layer, u8 linkid,
+                                 struct cflayer *client_layer)
+{
+       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, linkid);
+
+       if (servl == NULL) {
+               pr_err("CAIF: %s(): PROTOCOL ERROR "
+                      "- Error removing service_layer Linkid(%d)",
+                       __func__, linkid);
+               return;
+       }
+       caif_assert(linkid == servl->id);
+
+       if (servl != client_layer && servl->up != client_layer) {
+               pr_err("CAIF: %s(): Error removing service_layer "
+                      "Linkid(%d) %p %p",
+                       __func__, linkid, (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,
+                               struct cfctrl_link_param *param,
+                               struct cflayer *adap_layer)
+{
+       struct cflayer *frml;
+       if (adap_layer == NULL) {
+               pr_err("CAIF: %s(): adap_layer is zero", __func__);
+               return -EINVAL;
+       }
+       if (adap_layer->receive == NULL) {
+               pr_err("CAIF: %s(): adap_layer->receive is NULL", __func__);
+               return -EINVAL;
+       }
+       if (adap_layer->ctrlcmd == NULL) {
+               pr_err("CAIF: %s(): adap_layer->ctrlcmd == NULL", __func__);
+               return -EINVAL;
+       }
+       frml = cnfg->phy_layers[param->phyid].frm_layer;
+       if (frml == NULL) {
+               pr_err("CAIF: %s(): Specified PHY type does not exist!",
+                       __func__);
+               return -ENODEV;
+       }
+       caif_assert(param->phyid == cnfg->phy_layers[param->phyid].id);
+       caif_assert(cnfg->phy_layers[param->phyid].frm_layer->id ==
+                    param->phyid);
+       caif_assert(cnfg->phy_layers[param->phyid].phy_layer->id ==
+                    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;
+}
+EXPORT_SYMBOL(cfcnfg_add_adaptation_layer);
+
+static void cncfg_reject_rsp(struct cflayer *layer, u8 linkid,
+                            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
+cncfg_linkup_rsp(struct cflayer *layer, u8 linkid, enum cfctrl_srv serv,
+                u8 phyid, struct cflayer *adapt_layer)
+{
+       struct cfcnfg *cnfg = container_obj(layer);
+       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__);
+               return;
+       }
+
+       caif_assert(cnfg != NULL);
+       caif_assert(phyid != 0);
+       phyinfo = &cnfg->phy_layers[phyid];
+       caif_assert(phyinfo != NULL);
+       caif_assert(phyinfo->id == phyid);
+       caif_assert(phyinfo->phy_layer != NULL);
+       caif_assert(phyinfo->phy_layer->id == phyid);
+
+       if (phyinfo != NULL &&
+           phyinfo->phy_ref_count++ == 0 &&
+           phyinfo->phy_layer != NULL &&
+           phyinfo->phy_layer->modemcmd != NULL) {
+               caif_assert(phyinfo->phy_layer->id == phyid);
+               phyinfo->phy_layer->modemcmd(phyinfo->phy_layer,
+                                            _CAIF_MODEMCMD_PHYIF_USEFULL);
+
+       }
+       adapt_layer->id = linkid;
+
+       switch (serv) {
+       case CFCTRL_SRV_VEI:
+               servicel = cfvei_create(linkid, &phyinfo->dev_info);
+               break;
+       case CFCTRL_SRV_DATAGRAM:
+               servicel = cfdgml_create(linkid, &phyinfo->dev_info);
+               break;
+       case CFCTRL_SRV_RFM:
+               servicel = cfrfml_create(linkid, &phyinfo->dev_info);
+               break;
+       case CFCTRL_SRV_UTIL:
+               servicel = cfutill_create(linkid, &phyinfo->dev_info);
+               break;
+       case CFCTRL_SRV_VIDEO:
+               servicel = cfvidl_create(linkid, &phyinfo->dev_info);
+               break;
+       case CFCTRL_SRV_DBG:
+               servicel = cfdbgl_create(linkid, &phyinfo->dev_info);
+               break;
+       default:
+               pr_err("CAIF: %s(): Protocol error. "
+                       "Link setup response - unknown channel type\n",
+                       __func__);
+               return;
+       }
+       if (!servicel) {
+               pr_warning("CAIF: %s(): Out of memory\n", __func__);
+               return;
+       }
+       layer_set_dn(servicel, cnfg->mux);
+       cfmuxl_set_uplayer(cnfg->mux, servicel, linkid);
+       layer_set_up(servicel, adapt_layer);
+       layer_set_dn(adapt_layer, servicel);
+       servicel->ctrlcmd(servicel, CAIF_CTRLCMD_INIT_RSP, 0);
+}
+
+void
+cfcnfg_add_phy_layer(struct cfcnfg *cnfg, enum cfcnfg_phy_type phy_type,
+                    void *dev, struct cflayer *phy_layer, u16 *phyid,
+                    enum cfcnfg_phy_preference pref,
+                    bool fcs, bool stx)
+{
+       struct cflayer *frml;
+       struct cflayer *phy_driver = NULL;
+       int i;
+
+
+       if (cnfg->phy_layers[cnfg->last_phyid].frm_layer == NULL) {
+               *phyid = cnfg->last_phyid;
+
+               /* range: * 1..(MAX_PHY_LAYERS-1) */
+               cnfg->last_phyid =
+                   (cnfg->last_phyid % (MAX_PHY_LAYERS - 1)) + 1;
+       } else {
+               *phyid = 0;
+               for (i = 1; i < MAX_PHY_LAYERS; i++) {
+                       if (cnfg->phy_layers[i].frm_layer == NULL) {
+                               *phyid = i;
+                               break;
+                       }
+               }
+       }
+       if (*phyid == 0) {
+               pr_err("CAIF: %s(): No Available PHY ID\n", __func__);
+               return;
+       }
+
+       switch (phy_type) {
+       case CFPHYTYPE_FRAG:
+               phy_driver =
+                   cfserl_create(CFPHYTYPE_FRAG, *phyid, stx);
+               if (!phy_driver) {
+                       pr_warning("CAIF: %s(): Out of memory\n", __func__);
+                       return;
+               }
+
+               break;
+       case CFPHYTYPE_CAIF:
+               phy_driver = NULL;
+               break;
+       default:
+               pr_err("CAIF: %s(): %d", __func__, phy_type);
+               return;
+               break;
+       }
+
+       phy_layer->id = *phyid;
+       cnfg->phy_layers[*phyid].pref = pref;
+       cnfg->phy_layers[*phyid].id = *phyid;
+       cnfg->phy_layers[*phyid].dev_info.id = *phyid;
+       cnfg->phy_layers[*phyid].dev_info.dev = dev;
+       cnfg->phy_layers[*phyid].phy_layer = phy_layer;
+       cnfg->phy_layers[*phyid].phy_ref_count = 0;
+       phy_layer->type = phy_type;
+       frml = cffrml_create(*phyid, fcs);
+       if (!frml) {
+               pr_warning("CAIF: %s(): Out of memory\n", __func__);
+               return;
+       }
+       cnfg->phy_layers[*phyid].frm_layer = frml;
+       cfmuxl_set_dnlayer(cnfg->mux, frml, *phyid);
+       layer_set_up(frml, cnfg->mux);
+
+       if (phy_driver != NULL) {
+               phy_driver->id = *phyid;
+               layer_set_dn(frml, phy_driver);
+               layer_set_up(phy_driver, frml);
+               layer_set_dn(phy_driver, phy_layer);
+               layer_set_up(phy_layer, phy_driver);
+       } else {
+               layer_set_dn(frml, phy_layer);
+               layer_set_up(phy_layer, frml);
+       }
+}
+EXPORT_SYMBOL(cfcnfg_add_phy_layer);
+
+int cfcnfg_del_phy_layer(struct cfcnfg *cnfg, struct cflayer *phy_layer)
+{
+       struct cflayer *frml, *frml_dn;
+       u16 phyid;
+       phyid = phy_layer->id;
+       caif_assert(phyid == cnfg->phy_layers[phyid].id);
+       caif_assert(phy_layer == cnfg->phy_layers[phyid].phy_layer);
+       caif_assert(phy_layer->id == phyid);
+       caif_assert(cnfg->phy_layers[phyid].frm_layer->id == phyid);
+
+       memset(&cnfg->phy_layers[phy_layer->id], 0,
+              sizeof(struct cfcnfg_phyinfo));
+       frml = cfmuxl_remove_dnlayer(cnfg->mux, phy_layer->id);
+       frml_dn = frml->dn;
+       cffrml_set_uplayer(frml, NULL);
+       cffrml_set_dnlayer(frml, NULL);
+       kfree(frml);
+
+       if (phy_layer != frml_dn) {
+               layer_set_up(frml_dn, NULL);
+               layer_set_dn(frml_dn, NULL);
+               kfree(frml_dn);
+       }
+       layer_set_up(phy_layer, NULL);
+       return 0;
+}
+EXPORT_SYMBOL(cfcnfg_del_phy_layer);
diff --git a/net/caif/cfpkt_skbuff.c b/net/caif/cfpkt_skbuff.c
new file mode 100644 (file)
index 0000000..83fff2f
--- /dev/null
@@ -0,0 +1,571 @@
+/*
+ * Copyright (C) ST-Ericsson AB 2010
+ * Author:     Sjur Brendeland/sjur.brandeland@stericsson.com
+ * License terms: GNU General Public License (GPL) version 2
+ */
+
+#include <linux/string.h>
+#include <linux/skbuff.h>
+#include <linux/hardirq.h>
+#include <net/caif/cfpkt.h>
+
+#define PKT_PREFIX CAIF_NEEDED_HEADROOM
+#define PKT_POSTFIX CAIF_NEEDED_TAILROOM
+#define PKT_LEN_WHEN_EXTENDING 128
+#define PKT_ERROR(pkt, errmsg) do {       \
+    cfpkt_priv(pkt)->erronous = true;     \
+    skb_reset_tail_pointer(&pkt->skb);    \
+    pr_warning("CAIF: " errmsg);\
+  } while (0)
+
+struct cfpktq {
+       struct sk_buff_head head;
+       atomic_t count;
+       /* Lock protects count updates */
+       spinlock_t lock;
+};
+
+/*
+ * net/caif/ is generic and does not
+ * understand SKB, so we do this typecast
+ */
+struct cfpkt {
+       struct sk_buff skb;
+};
+
+/* Private data inside SKB */
+struct cfpkt_priv_data {
+       struct dev_info dev_info;
+       bool erronous;
+};
+
+inline struct cfpkt_priv_data *cfpkt_priv(struct cfpkt *pkt)
+{
+       return (struct cfpkt_priv_data *) pkt->skb.cb;
+}
+
+inline bool is_erronous(struct cfpkt *pkt)
+{
+       return cfpkt_priv(pkt)->erronous;
+}
+
+inline struct sk_buff *pkt_to_skb(struct cfpkt *pkt)
+{
+       return &pkt->skb;
+}
+
+inline struct cfpkt *skb_to_pkt(struct sk_buff *skb)
+{
+       return (struct cfpkt *) skb;
+}
+
+
+struct cfpkt *cfpkt_fromnative(enum caif_direction dir, void *nativepkt)
+{
+       struct cfpkt *pkt = skb_to_pkt(nativepkt);
+       cfpkt_priv(pkt)->erronous = false;
+       return pkt;
+}
+EXPORT_SYMBOL(cfpkt_fromnative);
+
+void *cfpkt_tonative(struct cfpkt *pkt)
+{
+       return (void *) pkt;
+}
+EXPORT_SYMBOL(cfpkt_tonative);
+
+static struct cfpkt *cfpkt_create_pfx(u16 len, u16 pfx)
+{
+       struct sk_buff *skb;
+
+       if (likely(in_interrupt()))
+               skb = alloc_skb(len + pfx, GFP_ATOMIC);
+       else
+               skb = alloc_skb(len + pfx, GFP_KERNEL);
+
+       if (unlikely(skb == NULL))
+               return NULL;
+
+       skb_reserve(skb, pfx);
+       return skb_to_pkt(skb);
+}
+
+inline struct cfpkt *cfpkt_create(u16 len)
+{
+       return cfpkt_create_pfx(len + PKT_POSTFIX, PKT_PREFIX);
+}
+EXPORT_SYMBOL(cfpkt_create);
+
+void cfpkt_destroy(struct cfpkt *pkt)
+{
+       struct sk_buff *skb = pkt_to_skb(pkt);
+       kfree_skb(skb);
+}
+EXPORT_SYMBOL(cfpkt_destroy);
+
+inline bool cfpkt_more(struct cfpkt *pkt)
+{
+       struct sk_buff *skb = pkt_to_skb(pkt);
+       return skb->len > 0;
+}
+EXPORT_SYMBOL(cfpkt_more);
+
+int cfpkt_peek_head(struct cfpkt *pkt, void *data, u16 len)
+{
+       struct sk_buff *skb = pkt_to_skb(pkt);
+       if (skb_headlen(skb) >= len) {
+               memcpy(data, skb->data, len);
+               return 0;
+       }
+       return !cfpkt_extr_head(pkt, data, len) &&
+           !cfpkt_add_head(pkt, data, len);
+}
+EXPORT_SYMBOL(cfpkt_peek_head);
+
+int cfpkt_extr_head(struct cfpkt *pkt, void *data, u16 len)
+{
+       struct sk_buff *skb = pkt_to_skb(pkt);
+       u8 *from;
+       if (unlikely(is_erronous(pkt)))
+               return -EPROTO;
+
+       if (unlikely(len > skb->len)) {
+               PKT_ERROR(pkt, "cfpkt_extr_head read beyond end of packet\n");
+               return -EPROTO;
+       }
+
+       if (unlikely(len > skb_headlen(skb))) {
+               if (unlikely(skb_linearize(skb) != 0)) {
+                       PKT_ERROR(pkt, "cfpkt_extr_head linearize failed\n");
+                       return -EPROTO;
+               }
+       }
+       from = skb_pull(skb, len);
+       from -= len;
+       memcpy(data, from, len);
+       return 0;
+}
+EXPORT_SYMBOL(cfpkt_extr_head);
+
+int cfpkt_extr_trail(struct cfpkt *pkt, void *dta, u16 len)
+{
+       struct sk_buff *skb = pkt_to_skb(pkt);
+       u8 *data = dta;
+       u8 *from;
+       if (unlikely(is_erronous(pkt)))
+               return -EPROTO;
+
+       if (unlikely(skb_linearize(skb) != 0)) {
+               PKT_ERROR(pkt, "cfpkt_extr_trail linearize failed\n");
+               return -EPROTO;
+       }
+       if (unlikely(skb->data + len > skb_tail_pointer(skb))) {
+               PKT_ERROR(pkt, "cfpkt_extr_trail read beyond end of packet\n");
+               return -EPROTO;
+       }
+       from = skb_tail_pointer(skb) - len;
+       skb_trim(skb, skb->len - len);
+       memcpy(data, from, len);
+       return 0;
+}
+EXPORT_SYMBOL(cfpkt_extr_trail);
+
+int cfpkt_pad_trail(struct cfpkt *pkt, u16 len)
+{
+       return cfpkt_add_body(pkt, NULL, len);
+}
+EXPORT_SYMBOL(cfpkt_pad_trail);
+
+int cfpkt_add_body(struct cfpkt *pkt, const void *data, u16 len)
+{
+       struct sk_buff *skb = pkt_to_skb(pkt);
+       struct sk_buff *lastskb;
+       u8 *to;
+       u16 addlen = 0;
+
+
+       if (unlikely(is_erronous(pkt)))
+               return -EPROTO;
+
+       lastskb = skb;
+
+       /* Check whether we need to add space at the tail */
+       if (unlikely(skb_tailroom(skb) < len)) {
+               if (likely(len < PKT_LEN_WHEN_EXTENDING))
+                       addlen = PKT_LEN_WHEN_EXTENDING;
+               else
+                       addlen = len;
+       }
+
+       /* Check whether we need to change the SKB before writing to the tail */
+       if (unlikely((addlen > 0) || skb_cloned(skb) || skb_shared(skb))) {
+
+               /* Make sure data is writable */
+               if (unlikely(skb_cow_data(skb, addlen, &lastskb) < 0)) {
+                       PKT_ERROR(pkt, "cfpkt_add_body: cow failed\n");
+                       return -EPROTO;
+               }
+               /*
+                * Is the SKB non-linear after skb_cow_data()? If so, we are
+                * going to add data to the last SKB, so we need to adjust
+                * lengths of the top SKB.
+                */
+               if (lastskb != skb) {
+                       pr_warning("CAIF: %s(): Packet is non-linear\n",
+                                  __func__);
+                       skb->len += len;
+                       skb->data_len += len;
+               }
+       }
+
+       /* All set to put the last SKB and optionally write data there. */
+       to = skb_put(lastskb, len);
+       if (likely(data))
+               memcpy(to, data, len);
+       return 0;
+}
+EXPORT_SYMBOL(cfpkt_add_body);
+
+inline int cfpkt_addbdy(struct cfpkt *pkt, u8 data)
+{
+       return cfpkt_add_body(pkt, &data, 1);
+}
+EXPORT_SYMBOL(cfpkt_addbdy);
+
+int cfpkt_add_head(struct cfpkt *pkt, const void *data2, u16 len)
+{
+       struct sk_buff *skb = pkt_to_skb(pkt);
+       struct sk_buff *lastskb;
+       u8 *to;
+       const u8 *data = data2;
+       if (unlikely(is_erronous(pkt)))
+               return -EPROTO;
+       if (unlikely(skb_headroom(skb) < len)) {
+               PKT_ERROR(pkt, "cfpkt_add_head: no headroom\n");
+               return -EPROTO;
+       }
+
+       /* Make sure data is writable */
+       if (unlikely(skb_cow_data(skb, 0, &lastskb) < 0)) {
+               PKT_ERROR(pkt, "cfpkt_add_head: cow failed\n");
+               return -EPROTO;
+       }
+
+       to = skb_push(skb, len);
+       memcpy(to, data, len);
+       return 0;
+}
+EXPORT_SYMBOL(cfpkt_add_head);
+
+inline int cfpkt_add_trail(struct cfpkt *pkt, const void *data, u16 len)
+{
+       return cfpkt_add_body(pkt, data, len);
+}
+EXPORT_SYMBOL(cfpkt_add_trail);
+
+inline u16 cfpkt_getlen(struct cfpkt *pkt)
+{
+       struct sk_buff *skb = pkt_to_skb(pkt);
+       return skb->len;
+}
+EXPORT_SYMBOL(cfpkt_getlen);
+
+inline u16 cfpkt_iterate(struct cfpkt *pkt,
+                           u16 (*iter_func)(u16, void *, u16),
+                           u16 data)
+{
+       /*
+        * Don't care about the performance hit of linearizing,
+        * Checksum should not be used on high-speed interfaces anyway.
+        */
+       if (unlikely(is_erronous(pkt)))
+               return -EPROTO;
+       if (unlikely(skb_linearize(&pkt->skb) != 0)) {
+               PKT_ERROR(pkt, "cfpkt_iterate: linearize failed\n");
+               return -EPROTO;
+       }
+       return iter_func(data, pkt->skb.data, cfpkt_getlen(pkt));
+}
+EXPORT_SYMBOL(cfpkt_iterate);
+
+int cfpkt_setlen(struct cfpkt *pkt, u16 len)
+{
+       struct sk_buff *skb = pkt_to_skb(pkt);
+
+
+       if (unlikely(is_erronous(pkt)))
+               return -EPROTO;
+
+       if (likely(len <= skb->len)) {
+               if (unlikely(skb->data_len))
+                       ___pskb_trim(skb, len);
+               else
+                       skb_trim(skb, len);
+
+                       return cfpkt_getlen(pkt);
+       }
+
+       /* Need to expand SKB */
+       if (unlikely(!cfpkt_pad_trail(pkt, len - skb->len)))
+               PKT_ERROR(pkt, "cfpkt_setlen: skb_pad_trail failed\n");
+
+       return cfpkt_getlen(pkt);
+}
+EXPORT_SYMBOL(cfpkt_setlen);
+
+struct cfpkt *cfpkt_create_uplink(const unsigned char *data, unsigned int len)
+{
+       struct cfpkt *pkt = cfpkt_create_pfx(len + PKT_POSTFIX, PKT_PREFIX);
+       if (unlikely(data != NULL))
+               cfpkt_add_body(pkt, data, len);
+       return pkt;
+}
+EXPORT_SYMBOL(cfpkt_create_uplink);
+
+struct cfpkt *cfpkt_append(struct cfpkt *dstpkt,
+                            struct cfpkt *addpkt,
+                            u16 expectlen)
+{
+       struct sk_buff *dst = pkt_to_skb(dstpkt);
+       struct sk_buff *add = pkt_to_skb(addpkt);
+       u16 addlen = skb_headlen(add);
+       u16 neededtailspace;
+       struct sk_buff *tmp;
+       u16 dstlen;
+       u16 createlen;
+       if (unlikely(is_erronous(dstpkt) || is_erronous(addpkt))) {
+               cfpkt_destroy(addpkt);
+               return dstpkt;
+       }
+       if (expectlen > addlen)
+               neededtailspace = expectlen;
+       else
+               neededtailspace = addlen;
+
+       if (dst->tail + neededtailspace > dst->end) {
+               /* Create a dumplicate of 'dst' with more tail space */
+               dstlen = skb_headlen(dst);
+               createlen = dstlen + neededtailspace;
+               tmp = pkt_to_skb(
+                       cfpkt_create(createlen + PKT_PREFIX + PKT_POSTFIX));
+               if (!tmp)
+                       return NULL;
+               skb_set_tail_pointer(tmp, dstlen);
+               tmp->len = dstlen;
+               memcpy(tmp->data, dst->data, dstlen);
+               cfpkt_destroy(dstpkt);
+               dst = tmp;
+       }
+       memcpy(skb_tail_pointer(dst), add->data, skb_headlen(add));
+       cfpkt_destroy(addpkt);
+       dst->tail += addlen;
+       dst->len += addlen;
+       return skb_to_pkt(dst);
+}
+EXPORT_SYMBOL(cfpkt_append);
+
+struct cfpkt *cfpkt_split(struct cfpkt *pkt, u16 pos)
+{
+       struct sk_buff *skb2;
+       struct sk_buff *skb = pkt_to_skb(pkt);
+       u8 *split = skb->data + pos;
+       u16 len2nd = skb_tail_pointer(skb) - split;
+
+       if (unlikely(is_erronous(pkt)))
+               return NULL;
+
+       if (skb->data + pos > skb_tail_pointer(skb)) {
+               PKT_ERROR(pkt,
+                         "cfpkt_split: trying to split beyond end of packet");
+               return NULL;
+       }
+
+       /* Create a new packet for the second part of the data */
+       skb2 = pkt_to_skb(
+               cfpkt_create_pfx(len2nd + PKT_PREFIX + PKT_POSTFIX,
+                                PKT_PREFIX));
+
+       if (skb2 == NULL)
+               return NULL;
+
+       /* Reduce the length of the original packet */
+       skb_set_tail_pointer(skb, pos);
+       skb->len = pos;
+
+       memcpy(skb2->data, split, len2nd);
+       skb2->tail += len2nd;
+       skb2->len += len2nd;
+       return skb_to_pkt(skb2);
+}
+EXPORT_SYMBOL(cfpkt_split);
+
+char *cfpkt_log_pkt(struct cfpkt *pkt, char *buf, int buflen)
+{
+       struct sk_buff *skb = pkt_to_skb(pkt);
+       char *p = buf;
+       int i;
+
+       /*
+        * Sanity check buffer length, it needs to be at least as large as
+        * the header info: ~=50+ bytes
+        */
+       if (buflen < 50)
+               return NULL;
+
+       snprintf(buf, buflen, "%s: pkt:%p len:%ld(%ld+%ld) {%ld,%ld} data: [",
+               is_erronous(pkt) ? "ERRONOUS-SKB" :
+                (skb->data_len != 0 ? "COMPLEX-SKB" : "SKB"),
+                skb,
+                (long) skb->len,
+                (long) (skb_tail_pointer(skb) - skb->data),
+                (long) skb->data_len,
+                (long) (skb->data - skb->head),
+                (long) (skb_tail_pointer(skb) - skb->head));
+       p = buf + strlen(buf);
+
+       for (i = 0; i < skb_tail_pointer(skb) - skb->data && i < 300; i++) {
+               if (p > buf + buflen - 10) {
+                       sprintf(p, "...");
+                       p = buf + strlen(buf);
+                       break;
+               }
+               sprintf(p, "%02x,", skb->data[i]);
+               p = buf + strlen(buf);
+       }
+       sprintf(p, "]\n");
+       return buf;
+}
+EXPORT_SYMBOL(cfpkt_log_pkt);
+
+int cfpkt_raw_append(struct cfpkt *pkt, void **buf, unsigned int buflen)
+{
+       struct sk_buff *skb = pkt_to_skb(pkt);
+       struct sk_buff *lastskb;
+
+       caif_assert(buf != NULL);
+       if (unlikely(is_erronous(pkt)))
+               return -EPROTO;
+       /* Make sure SKB is writable */
+       if (unlikely(skb_cow_data(skb, 0, &lastskb) < 0)) {
+               PKT_ERROR(pkt, "cfpkt_raw_append: skb_cow_data failed\n");
+               return -EPROTO;
+       }
+
+       if (unlikely(skb_linearize(skb) != 0)) {
+               PKT_ERROR(pkt, "cfpkt_raw_append: linearize failed\n");
+               return -EPROTO;
+       }
+
+       if (unlikely(skb_tailroom(skb) < buflen)) {
+               PKT_ERROR(pkt, "cfpkt_raw_append: buffer too short - failed\n");
+               return -EPROTO;
+       }
+
+       *buf = skb_put(skb, buflen);
+       return 1;
+}
+EXPORT_SYMBOL(cfpkt_raw_append);
+
+int cfpkt_raw_extract(struct cfpkt *pkt, void **buf, unsigned int buflen)
+{
+       struct sk_buff *skb = pkt_to_skb(pkt);
+
+       caif_assert(buf != NULL);
+       if (unlikely(is_erronous(pkt)))
+               return -EPROTO;
+
+       if (unlikely(buflen > skb->len)) {
+               PKT_ERROR(pkt, "cfpkt_raw_extract: buflen too large "
+                               "- failed\n");
+               return -EPROTO;
+       }
+
+       if (unlikely(buflen > skb_headlen(skb))) {
+               if (unlikely(skb_linearize(skb) != 0)) {
+                       PKT_ERROR(pkt, "cfpkt_raw_extract: linearize failed\n");
+                       return -EPROTO;
+               }
+       }
+
+       *buf = skb->data;
+       skb_pull(skb, buflen);
+
+       return 1;
+}
+EXPORT_SYMBOL(cfpkt_raw_extract);
+
+inline bool cfpkt_erroneous(struct cfpkt *pkt)
+{
+       return cfpkt_priv(pkt)->erronous;
+}
+EXPORT_SYMBOL(cfpkt_erroneous);
+
+struct cfpktq *cfpktq_create(void)
+{
+       struct cfpktq *q = kmalloc(sizeof(struct cfpktq), GFP_ATOMIC);
+       if (!q)
+               return NULL;
+       skb_queue_head_init(&q->head);
+       atomic_set(&q->count, 0);
+       spin_lock_init(&q->lock);
+       return q;
+}
+EXPORT_SYMBOL(cfpktq_create);
+
+void cfpkt_queue(struct cfpktq *pktq, struct cfpkt *pkt, unsigned short prio)
+{
+       atomic_inc(&pktq->count);
+       spin_lock(&pktq->lock);
+       skb_queue_tail(&pktq->head, pkt_to_skb(pkt));
+       spin_unlock(&pktq->lock);
+
+}
+EXPORT_SYMBOL(cfpkt_queue);
+
+struct cfpkt *cfpkt_qpeek(struct cfpktq *pktq)
+{
+       struct cfpkt *tmp;
+       spin_lock(&pktq->lock);
+       tmp = skb_to_pkt(skb_peek(&pktq->head));
+       spin_unlock(&pktq->lock);
+       return tmp;
+}
+EXPORT_SYMBOL(cfpkt_qpeek);
+
+struct cfpkt *cfpkt_dequeue(struct cfpktq *pktq)
+{
+       struct cfpkt *pkt;
+       spin_lock(&pktq->lock);
+       pkt = skb_to_pkt(skb_dequeue(&pktq->head));
+       if (pkt) {
+               atomic_dec(&pktq->count);
+               caif_assert(atomic_read(&pktq->count) >= 0);
+       }
+       spin_unlock(&pktq->lock);
+       return pkt;
+}
+EXPORT_SYMBOL(cfpkt_dequeue);
+
+int cfpkt_qcount(struct cfpktq *pktq)
+{
+       return atomic_read(&pktq->count);
+}
+EXPORT_SYMBOL(cfpkt_qcount);
+
+struct cfpkt *cfpkt_clone_release(struct cfpkt *pkt)
+{
+       struct cfpkt *clone;
+       clone  = skb_to_pkt(skb_clone(pkt_to_skb(pkt), GFP_ATOMIC));
+       /* Free original packet. */
+       cfpkt_destroy(pkt);
+       if (!clone)
+               return NULL;
+       return clone;
+}
+EXPORT_SYMBOL(cfpkt_clone_release);
+
+struct caif_payload_info *cfpkt_info(struct cfpkt *pkt)
+{
+       return (struct caif_payload_info *)&pkt_to_skb(pkt)->cb;
+}
+EXPORT_SYMBOL(cfpkt_info);