1 // SPDX-License-Identifier: GPL-2.0-only
5  * Copyright (C) ST-Ericsson AB 2010
14 #include <linux/crc-ccitt.h>
40 	this->pcpu_refcnt = alloc_percpu(int);  in cffrml_create()
41 	if (this->pcpu_refcnt == NULL) {  in cffrml_create()
48 	this->layer.receive = cffrml_receive;  in cffrml_create()
49 	this->layer.transmit = cffrml_transmit;  in cffrml_create()
50 	this->layer.ctrlcmd = cffrml_ctrlcmd;  in cffrml_create()
51 	snprintf(this->layer.name, CAIF_LAYER_NAME_SZ, "frm%d", phyid);  in cffrml_create()
52 	this->dofcs = use_fcs;  in cffrml_create()
53 	this->layer.id = phyid;  in cffrml_create()
60 	free_percpu(this->pcpu_refcnt);  in cffrml_free()
66 	this->up = up;  in cffrml_set_uplayer()
71 	this->dn = dn;  in cffrml_set_dnlayer()
76 	/* FIXME: FCS should be moved to glue in order to use OS-Specific  in cffrml_checksum()
95 	if (!this->dofcs)  in cffrml_receive()
96 		len -= 2;  in cffrml_receive()
102 		return -EPROTO;  in cffrml_receive()
105 	 * Don't do extract if FCS is false, rather do setlen - then we don't  in cffrml_receive()
106 	 * get a cache-miss.  in cffrml_receive()
108 	if (this->dofcs) {  in cffrml_receive()
118 			return -EILSEQ;  in cffrml_receive()
125 		return -EPROTO;  in cffrml_receive()
128 	if (layr->up == NULL) {  in cffrml_receive()
131 		return -EINVAL;  in cffrml_receive()
134 	return layr->up->receive(layr->up, pkt);  in cffrml_receive()
144 	if (this->dofcs) {  in cffrml_transmit()
154 	cfpkt_info(pkt)->hdr_len += 2;  in cffrml_transmit()
158 		return -EPROTO;  in cffrml_transmit()
161 	if (layr->dn == NULL) {  in cffrml_transmit()
163 		return -ENODEV;  in cffrml_transmit()
166 	return layr->dn->transmit(layr->dn, pkt);  in cffrml_transmit()
172 	if (layr->up && layr->up->ctrlcmd)  in cffrml_ctrlcmd()
173 		layr->up->ctrlcmd(layr->up, ctrl, layr->id);  in cffrml_ctrlcmd()
179 	if (layr != NULL && this->pcpu_refcnt != NULL)  in cffrml_put()
180 		this_cpu_dec(*this->pcpu_refcnt);  in cffrml_put()
186 	if (layr != NULL && this->pcpu_refcnt != NULL)  in cffrml_hold()
187 		this_cpu_inc(*this->pcpu_refcnt);  in cffrml_hold()
195 		refcnt += *per_cpu_ptr(this->pcpu_refcnt, i);  in cffrml_refcnt_read()