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net-caif: add CAIF generic caif support functions
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>
This commit is contained in:
Sjur Braendeland
David S. Miller
parent
b482cd2053
commit
15c9ac0c80
529
net/caif/cfcnfg.c
Normal file
529
net/caif/cfcnfg.c
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@ -0,0 +1,529 @@
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/*
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* Copyright (C) ST-Ericsson AB 2010
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* Author: Sjur Brendeland/sjur.brandeland@stericsson.com
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* License terms: GNU General Public License (GPL) version 2
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*/
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#include <linux/kernel.h>
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#include <linux/stddef.h>
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#include <net/caif/caif_layer.h>
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#include <net/caif/cfpkt.h>
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#include <net/caif/cfcnfg.h>
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#include <net/caif/cfctrl.h>
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#include <net/caif/cfmuxl.h>
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#include <net/caif/cffrml.h>
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#include <net/caif/cfserl.h>
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#include <net/caif/cfsrvl.h>
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#include <linux/module.h>
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#include <asm/atomic.h>
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#define MAX_PHY_LAYERS 7
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#define PHY_NAME_LEN 20
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#define container_obj(layr) container_of(layr, struct cfcnfg, layer)
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/* Information about CAIF physical interfaces held by Config Module in order
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* to manage physical interfaces
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*/
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struct cfcnfg_phyinfo {
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/* Pointer to the layer below the MUX (framing layer) */
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struct cflayer *frm_layer;
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/* Pointer to the lowest actual physical layer */
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struct cflayer *phy_layer;
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/* Unique identifier of the physical interface */
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unsigned int id;
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/* Preference of the physical in interface */
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enum cfcnfg_phy_preference pref;
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/* Reference count, number of channels using the device */
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int phy_ref_count;
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/* Information about the physical device */
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struct dev_info dev_info;
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};
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struct cfcnfg {
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struct cflayer layer;
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struct cflayer *ctrl;
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struct cflayer *mux;
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u8 last_phyid;
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struct cfcnfg_phyinfo phy_layers[MAX_PHY_LAYERS];
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};
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static void cncfg_linkup_rsp(struct cflayer *layer, u8 linkid,
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enum cfctrl_srv serv, u8 phyid,
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struct cflayer *adapt_layer);
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static void cncfg_linkdestroy_rsp(struct cflayer *layer, u8 linkid,
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struct cflayer *client_layer);
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static void cncfg_reject_rsp(struct cflayer *layer, u8 linkid,
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struct cflayer *adapt_layer);
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static void cfctrl_resp_func(void);
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static void cfctrl_enum_resp(void);
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struct cfcnfg *cfcnfg_create(void)
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{
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struct cfcnfg *this;
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struct cfctrl_rsp *resp;
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/* Initiate this layer */
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this = kmalloc(sizeof(struct cfcnfg), GFP_ATOMIC);
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if (!this) {
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pr_warning("CAIF: %s(): Out of memory\n", __func__);
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return NULL;
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}
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memset(this, 0, sizeof(struct cfcnfg));
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this->mux = cfmuxl_create();
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if (!this->mux)
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goto out_of_mem;
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this->ctrl = cfctrl_create();
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if (!this->ctrl)
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goto out_of_mem;
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/* Initiate response functions */
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resp = cfctrl_get_respfuncs(this->ctrl);
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resp->enum_rsp = cfctrl_enum_resp;
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resp->linkerror_ind = cfctrl_resp_func;
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resp->linkdestroy_rsp = cncfg_linkdestroy_rsp;
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resp->sleep_rsp = cfctrl_resp_func;
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resp->wake_rsp = cfctrl_resp_func;
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resp->restart_rsp = cfctrl_resp_func;
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resp->radioset_rsp = cfctrl_resp_func;
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resp->linksetup_rsp = cncfg_linkup_rsp;
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resp->reject_rsp = cncfg_reject_rsp;
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this->last_phyid = 1;
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cfmuxl_set_uplayer(this->mux, this->ctrl, 0);
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layer_set_dn(this->ctrl, this->mux);
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layer_set_up(this->ctrl, this);
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return this;
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out_of_mem:
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pr_warning("CAIF: %s(): Out of memory\n", __func__);
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kfree(this->mux);
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kfree(this->ctrl);
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kfree(this);
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return NULL;
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}
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EXPORT_SYMBOL(cfcnfg_create);
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void cfcnfg_remove(struct cfcnfg *cfg)
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{
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if (cfg) {
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kfree(cfg->mux);
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kfree(cfg->ctrl);
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kfree(cfg);
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}
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}
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static void cfctrl_resp_func(void)
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{
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}
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static void cfctrl_enum_resp(void)
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{
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}
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struct dev_info *cfcnfg_get_phyid(struct cfcnfg *cnfg,
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enum cfcnfg_phy_preference phy_pref)
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{
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u16 i;
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/* Try to match with specified preference */
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for (i = 1; i < MAX_PHY_LAYERS; i++) {
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if (cnfg->phy_layers[i].id == i &&
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cnfg->phy_layers[i].pref == phy_pref &&
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cnfg->phy_layers[i].frm_layer != NULL) {
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caif_assert(cnfg->phy_layers != NULL);
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caif_assert(cnfg->phy_layers[i].id == i);
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return &cnfg->phy_layers[i].dev_info;
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}
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}
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/* Otherwise just return something */
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for (i = 1; i < MAX_PHY_LAYERS; i++) {
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if (cnfg->phy_layers[i].id == i) {
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caif_assert(cnfg->phy_layers != NULL);
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caif_assert(cnfg->phy_layers[i].id == i);
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return &cnfg->phy_layers[i].dev_info;
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}
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}
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return NULL;
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}
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static struct cfcnfg_phyinfo *cfcnfg_get_phyinfo(struct cfcnfg *cnfg,
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u8 phyid)
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{
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int i;
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/* Try to match with specified preference */
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for (i = 0; i < MAX_PHY_LAYERS; i++)
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if (cnfg->phy_layers[i].frm_layer != NULL &&
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cnfg->phy_layers[i].id == phyid)
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return &cnfg->phy_layers[i];
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return NULL;
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}
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int cfcnfg_get_named(struct cfcnfg *cnfg, char *name)
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{
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int i;
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/* Try to match with specified name */
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for (i = 0; i < MAX_PHY_LAYERS; i++) {
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if (cnfg->phy_layers[i].frm_layer != NULL
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&& strcmp(cnfg->phy_layers[i].phy_layer->name,
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name) == 0)
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return cnfg->phy_layers[i].frm_layer->id;
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}
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return 0;
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}
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/*
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* NOTE: What happens on destroy failure:
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* 1a) No response - Too early
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* This will not happen because enumerate has already
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* completed.
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* 1b) No response - FATAL
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* Not handled, but this should be a CAIF PROTOCOL ERROR
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* Modem error, response is really expected - this
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* case is not really handled.
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* 2) O/E-bit indicate error
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* Ignored - this link is destroyed anyway.
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* 3) Not able to match on request
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* Not handled, but this should be a CAIF PROTOCOL ERROR
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* 4) Link-Error - (no response)
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* Not handled, but this should be a CAIF PROTOCOL ERROR
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*/
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int cfcnfg_del_adapt_layer(struct cfcnfg *cnfg, struct cflayer *adap_layer)
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{
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u8 channel_id = 0;
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int ret = 0;
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struct cfcnfg_phyinfo *phyinfo = NULL;
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u8 phyid = 0;
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caif_assert(adap_layer != NULL);
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channel_id = adap_layer->id;
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if (channel_id == 0) {
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pr_err("CAIF: %s():adap_layer->id is 0\n", __func__);
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ret = -ENOTCONN;
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goto end;
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}
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if (adap_layer->dn == NULL) {
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pr_err("CAIF: %s():adap_layer->dn is NULL\n", __func__);
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ret = -ENODEV;
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goto end;
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}
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if (adap_layer->dn != NULL)
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phyid = cfsrvl_getphyid(adap_layer->dn);
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phyinfo = cfcnfg_get_phyinfo(cnfg, phyid);
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if (phyinfo == NULL) {
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pr_warning("CAIF: %s(): No interface to send disconnect to\n",
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__func__);
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ret = -ENODEV;
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goto end;
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}
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if (phyinfo->id != phyid
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|| phyinfo->phy_layer->id != phyid
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|| phyinfo->frm_layer->id != phyid) {
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pr_err("CAIF: %s(): Inconsistency in phy registration\n",
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__func__);
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ret = -EINVAL;
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goto end;
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}
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ret = cfctrl_linkdown_req(cnfg->ctrl, channel_id, adap_layer);
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end:
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if (phyinfo != NULL && --phyinfo->phy_ref_count == 0 &&
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phyinfo->phy_layer != NULL &&
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phyinfo->phy_layer->modemcmd != NULL) {
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phyinfo->phy_layer->modemcmd(phyinfo->phy_layer,
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_CAIF_MODEMCMD_PHYIF_USELESS);
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}
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return ret;
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}
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EXPORT_SYMBOL(cfcnfg_del_adapt_layer);
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static void cncfg_linkdestroy_rsp(struct cflayer *layer, u8 linkid,
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struct cflayer *client_layer)
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{
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struct cfcnfg *cnfg = container_obj(layer);
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struct cflayer *servl;
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/*
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* 1) Remove service from the MUX layer. The MUX must
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* guarante that no more payload sent "upwards" (receive)
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*/
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servl = cfmuxl_remove_uplayer(cnfg->mux, linkid);
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if (servl == NULL) {
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pr_err("CAIF: %s(): PROTOCOL ERROR "
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"- Error removing service_layer Linkid(%d)",
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__func__, linkid);
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return;
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}
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caif_assert(linkid == servl->id);
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if (servl != client_layer && servl->up != client_layer) {
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pr_err("CAIF: %s(): Error removing service_layer "
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"Linkid(%d) %p %p",
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__func__, linkid, (void *) servl,
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(void *) client_layer);
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return;
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}
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/*
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* 2) DEINIT_RSP must guarantee that no more packets are transmitted
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* from client (adap_layer) when it returns.
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*/
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if (servl->ctrlcmd == NULL) {
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pr_err("CAIF: %s(): Error servl->ctrlcmd == NULL", __func__);
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return;
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}
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servl->ctrlcmd(servl, CAIF_CTRLCMD_DEINIT_RSP, 0);
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/* 3) It is now safe to destroy the service layer. */
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cfservl_destroy(servl);
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}
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/*
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* NOTE: What happens on linksetup failure:
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* 1a) No response - Too early
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* This will not happen because enumerate is secured
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* before using interface.
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* 1b) No response - FATAL
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* Not handled, but this should be a CAIF PROTOCOL ERROR
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* Modem error, response is really expected - this case is
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* not really handled.
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* 2) O/E-bit indicate error
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* Handled in cnfg_reject_rsp
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* 3) Not able to match on request
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* Not handled, but this should be a CAIF PROTOCOL ERROR
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* 4) Link-Error - (no response)
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* Not handled, but this should be a CAIF PROTOCOL ERROR
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*/
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int
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cfcnfg_add_adaptation_layer(struct cfcnfg *cnfg,
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struct cfctrl_link_param *param,
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struct cflayer *adap_layer)
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{
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struct cflayer *frml;
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if (adap_layer == NULL) {
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pr_err("CAIF: %s(): adap_layer is zero", __func__);
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return -EINVAL;
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}
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if (adap_layer->receive == NULL) {
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pr_err("CAIF: %s(): adap_layer->receive is NULL", __func__);
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return -EINVAL;
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}
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if (adap_layer->ctrlcmd == NULL) {
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pr_err("CAIF: %s(): adap_layer->ctrlcmd == NULL", __func__);
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return -EINVAL;
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}
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frml = cnfg->phy_layers[param->phyid].frm_layer;
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if (frml == NULL) {
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pr_err("CAIF: %s(): Specified PHY type does not exist!",
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__func__);
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return -ENODEV;
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}
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caif_assert(param->phyid == cnfg->phy_layers[param->phyid].id);
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caif_assert(cnfg->phy_layers[param->phyid].frm_layer->id ==
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param->phyid);
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caif_assert(cnfg->phy_layers[param->phyid].phy_layer->id ==
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param->phyid);
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/* FIXME: ENUMERATE INITIALLY WHEN ACTIVATING PHYSICAL INTERFACE */
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cfctrl_enum_req(cnfg->ctrl, param->phyid);
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cfctrl_linkup_request(cnfg->ctrl, param, adap_layer);
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return 0;
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}
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EXPORT_SYMBOL(cfcnfg_add_adaptation_layer);
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static void cncfg_reject_rsp(struct cflayer *layer, u8 linkid,
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struct cflayer *adapt_layer)
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{
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if (adapt_layer != NULL && adapt_layer->ctrlcmd != NULL)
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adapt_layer->ctrlcmd(adapt_layer,
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CAIF_CTRLCMD_INIT_FAIL_RSP, 0);
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}
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static void
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cncfg_linkup_rsp(struct cflayer *layer, u8 linkid, enum cfctrl_srv serv,
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u8 phyid, struct cflayer *adapt_layer)
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{
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struct cfcnfg *cnfg = container_obj(layer);
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struct cflayer *servicel = NULL;
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struct cfcnfg_phyinfo *phyinfo;
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if (adapt_layer == NULL) {
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pr_err("CAIF: %s(): PROTOCOL ERROR "
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"- LinkUp Request/Response did not match\n", __func__);
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return;
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}
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caif_assert(cnfg != NULL);
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caif_assert(phyid != 0);
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phyinfo = &cnfg->phy_layers[phyid];
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caif_assert(phyinfo != NULL);
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caif_assert(phyinfo->id == phyid);
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caif_assert(phyinfo->phy_layer != NULL);
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caif_assert(phyinfo->phy_layer->id == phyid);
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if (phyinfo != NULL &&
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phyinfo->phy_ref_count++ == 0 &&
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phyinfo->phy_layer != NULL &&
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phyinfo->phy_layer->modemcmd != NULL) {
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caif_assert(phyinfo->phy_layer->id == phyid);
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phyinfo->phy_layer->modemcmd(phyinfo->phy_layer,
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_CAIF_MODEMCMD_PHYIF_USEFULL);
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}
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adapt_layer->id = linkid;
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switch (serv) {
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case CFCTRL_SRV_VEI:
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servicel = cfvei_create(linkid, &phyinfo->dev_info);
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break;
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case CFCTRL_SRV_DATAGRAM:
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servicel = cfdgml_create(linkid, &phyinfo->dev_info);
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break;
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case CFCTRL_SRV_RFM:
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servicel = cfrfml_create(linkid, &phyinfo->dev_info);
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break;
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case CFCTRL_SRV_UTIL:
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servicel = cfutill_create(linkid, &phyinfo->dev_info);
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break;
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case CFCTRL_SRV_VIDEO:
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servicel = cfvidl_create(linkid, &phyinfo->dev_info);
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break;
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case CFCTRL_SRV_DBG:
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servicel = cfdbgl_create(linkid, &phyinfo->dev_info);
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break;
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default:
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pr_err("CAIF: %s(): Protocol error. "
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"Link setup response - unknown channel type\n",
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__func__);
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return;
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}
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if (!servicel) {
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pr_warning("CAIF: %s(): Out of memory\n", __func__);
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return;
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}
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layer_set_dn(servicel, cnfg->mux);
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cfmuxl_set_uplayer(cnfg->mux, servicel, linkid);
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layer_set_up(servicel, adapt_layer);
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layer_set_dn(adapt_layer, servicel);
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servicel->ctrlcmd(servicel, CAIF_CTRLCMD_INIT_RSP, 0);
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}
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void
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cfcnfg_add_phy_layer(struct cfcnfg *cnfg, enum cfcnfg_phy_type phy_type,
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void *dev, struct cflayer *phy_layer, u16 *phyid,
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enum cfcnfg_phy_preference pref,
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bool fcs, bool stx)
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{
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struct cflayer *frml;
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struct cflayer *phy_driver = NULL;
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int i;
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if (cnfg->phy_layers[cnfg->last_phyid].frm_layer == NULL) {
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*phyid = cnfg->last_phyid;
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/* range: * 1..(MAX_PHY_LAYERS-1) */
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cnfg->last_phyid =
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(cnfg->last_phyid % (MAX_PHY_LAYERS - 1)) + 1;
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} else {
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*phyid = 0;
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for (i = 1; i < MAX_PHY_LAYERS; i++) {
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if (cnfg->phy_layers[i].frm_layer == NULL) {
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*phyid = i;
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break;
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||||
}
|
||||
}
|
||||
}
|
||||
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);
|
||||
571
net/caif/cfpkt_skbuff.c
Normal file
571
net/caif/cfpkt_skbuff.c
Normal file
@ -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);
|
||||
Loading…
Reference in New Issue
Block a user