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Release 4.11 net/caif/cffrml.c

Directory: net/caif
/*
 * CAIF Framing Layer.
 *
 * Copyright (C) ST-Ericsson AB 2010
 * Author:      Sjur Brendeland
 * License terms: GNU General Public License (GPL) version 2
 */


#define pr_fmt(fmt) KBUILD_MODNAME ":%s(): " fmt, __func__

#include <linux/stddef.h>
#include <linux/spinlock.h>
#include <linux/slab.h>
#include <linux/crc-ccitt.h>
#include <linux/netdevice.h>
#include <net/caif/caif_layer.h>
#include <net/caif/cfpkt.h>
#include <net/caif/cffrml.h>


#define container_obj(layr) container_of(layr, struct cffrml, layer)


struct cffrml {
	
struct cflayer layer;
	
bool dofcs;		/* !< FCS active */
	
int __percpu		*pcpu_refcnt;
};

static int cffrml_receive(struct cflayer *layr, struct cfpkt *pkt);
static int cffrml_transmit(struct cflayer *layr, struct cfpkt *pkt);
static void cffrml_ctrlcmd(struct cflayer *layr, enum caif_ctrlcmd ctrl,
			   int phyid);


static u32 cffrml_rcv_error;

static u32 cffrml_rcv_checsum_error;

struct cflayer *cffrml_create(u16 phyid, bool use_fcs) { struct cffrml *this = kzalloc(sizeof(struct cffrml), GFP_ATOMIC); if (!this) return NULL; this->pcpu_refcnt = alloc_percpu(int); if (this->pcpu_refcnt == NULL) { kfree(this); return NULL; } caif_assert(offsetof(struct cffrml, layer) == 0); this->layer.receive = cffrml_receive; this->layer.transmit = cffrml_transmit; this->layer.ctrlcmd = cffrml_ctrlcmd; snprintf(this->layer.name, CAIF_LAYER_NAME_SZ, "frm%d", phyid); this->dofcs = use_fcs; this->layer.id = phyid; return (struct cflayer *) this; }

Contributors

PersonTokensPropCommitsCommitProp
Sjur Brændeland13799.28%266.67%
Joe Perches10.72%133.33%
Total138100.00%3100.00%


void cffrml_free(struct cflayer *layer) { struct cffrml *this = container_obj(layer); free_percpu(this->pcpu_refcnt); kfree(layer); }

Contributors

PersonTokensPropCommitsCommitProp
Sjur Brændeland32100.00%1100.00%
Total32100.00%1100.00%


void cffrml_set_uplayer(struct cflayer *this, struct cflayer *up) { this->up = up; }

Contributors

PersonTokensPropCommitsCommitProp
Sjur Brændeland21100.00%1100.00%
Total21100.00%1100.00%


void cffrml_set_dnlayer(struct cflayer *this, struct cflayer *dn) { this->dn = dn; }

Contributors

PersonTokensPropCommitsCommitProp
Sjur Brændeland21100.00%1100.00%
Total21100.00%1100.00%


static u16 cffrml_checksum(u16 chks, void *buf, u16 len) { /* FIXME: FCS should be moved to glue in order to use OS-Specific * solutions */ return crc_ccitt(chks, buf, len); }

Contributors

PersonTokensPropCommitsCommitProp
Sjur Brændeland27100.00%1100.00%
Total27100.00%1100.00%


static int cffrml_receive(struct cflayer *layr, struct cfpkt *pkt) { u16 tmp; u16 len; u16 hdrchks; int pktchks; struct cffrml *this; this = container_obj(layr); cfpkt_extr_head(pkt, &tmp, 2); len = le16_to_cpu(tmp); /* Subtract for FCS on length if FCS is not used. */ if (!this->dofcs) len -= 2; if (cfpkt_setlen(pkt, len) < 0) { ++cffrml_rcv_error; pr_err("Framing length error (%d)\n", len); cfpkt_destroy(pkt); return -EPROTO; } /* * Don't do extract if FCS is false, rather do setlen - then we don't * get a cache-miss. */ if (this->dofcs) { cfpkt_extr_trail(pkt, &tmp, 2); hdrchks = le16_to_cpu(tmp); pktchks = cfpkt_iterate(pkt, cffrml_checksum, 0xffff); if (pktchks != hdrchks) { cfpkt_add_trail(pkt, &tmp, 2); ++cffrml_rcv_error; ++cffrml_rcv_checsum_error; pr_info("Frame checksum error (0x%x != 0x%x)\n", hdrchks, pktchks); return -EILSEQ; } } if (cfpkt_erroneous(pkt)) { ++cffrml_rcv_error; pr_err("Packet is erroneous!\n"); cfpkt_destroy(pkt); return -EPROTO; } if (layr->up == NULL) { pr_err("Layr up is missing!\n"); cfpkt_destroy(pkt); return -EINVAL; } return layr->up->receive(layr->up, pkt); }

Contributors

PersonTokensPropCommitsCommitProp
Sjur Brændeland23598.33%250.00%
Joe Perches31.26%125.00%
Dan Carpenter10.42%125.00%
Total239100.00%4100.00%


static int cffrml_transmit(struct cflayer *layr, struct cfpkt *pkt) { u16 chks; u16 len; __le16 data; struct cffrml *this = container_obj(layr); if (this->dofcs) { chks = cfpkt_iterate(pkt, cffrml_checksum, 0xffff); data = cpu_to_le16(chks); cfpkt_add_trail(pkt, &data, 2); } else { cfpkt_pad_trail(pkt, 2); } len = cfpkt_getlen(pkt); data = cpu_to_le16(len); cfpkt_add_head(pkt, &data, 2); cfpkt_info(pkt)->hdr_len += 2; if (cfpkt_erroneous(pkt)) { pr_err("Packet is erroneous!\n"); cfpkt_destroy(pkt); return -EPROTO; } if (layr->dn == NULL) { cfpkt_destroy(pkt); return -ENODEV; } return layr->dn->transmit(layr->dn, pkt); }

Contributors

PersonTokensPropCommitsCommitProp
Sjur Brændeland16295.29%360.00%
Dan Carpenter74.12%120.00%
Joe Perches10.59%120.00%
Total170100.00%5100.00%


static void cffrml_ctrlcmd(struct cflayer *layr, enum caif_ctrlcmd ctrl, int phyid) { if (layr->up && layr->up->ctrlcmd) layr->up->ctrlcmd(layr->up, ctrl, layr->id); }

Contributors

PersonTokensPropCommitsCommitProp
Sjur Brændeland47100.00%2100.00%
Total47100.00%2100.00%


void cffrml_put(struct cflayer *layr) { struct cffrml *this = container_obj(layr); if (layr != NULL && this->pcpu_refcnt != NULL) this_cpu_dec(*this->pcpu_refcnt); }

Contributors

PersonTokensPropCommitsCommitProp
Sjur Brændeland3997.50%266.67%
Christoph Lameter12.50%133.33%
Total40100.00%3100.00%


void cffrml_hold(struct cflayer *layr) { struct cffrml *this = container_obj(layr); if (layr != NULL && this->pcpu_refcnt != NULL) this_cpu_inc(*this->pcpu_refcnt); }

Contributors

PersonTokensPropCommitsCommitProp
Sjur Brændeland3997.50%266.67%
Christoph Lameter12.50%133.33%
Total40100.00%3100.00%


int cffrml_refcnt_read(struct cflayer *layr) { int i, refcnt = 0; struct cffrml *this = container_obj(layr); for_each_possible_cpu(i) refcnt += *per_cpu_ptr(this->pcpu_refcnt, i); return refcnt; }

Contributors

PersonTokensPropCommitsCommitProp
Sjur Brændeland46100.00%1100.00%
Total46100.00%1100.00%


Overall Contributors

PersonTokensPropCommitsCommitProp
Sjur Brændeland91197.64%654.55%
Joe Perches121.29%218.18%
Dan Carpenter80.86%218.18%
Christoph Lameter20.21%19.09%
Total933100.00%11100.00%
Directory: net/caif
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