cregit-Linux how code gets into the kernel

Release 4.15 net/caif/cfdgml.c

Directory: net/caif
/*
 * 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 <net/caif/caif_layer.h>
#include <net/caif/cfsrvl.h>
#include <net/caif/cfpkt.h>



#define container_obj(layr) ((struct cfsrvl *) layr)


#define DGM_CMD_BIT  0x80

#define DGM_FLOW_OFF 0x81

#define DGM_FLOW_ON  0x80

#define DGM_MTU 1500

static int cfdgml_receive(struct cflayer *layr, struct cfpkt *pkt);
static int cfdgml_transmit(struct cflayer *layr, struct cfpkt *pkt);


struct cflayer *cfdgml_create(u8 channel_id, struct dev_info *dev_info) { struct cfsrvl *dgm = kzalloc(sizeof(struct cfsrvl), GFP_ATOMIC); if (!dgm) return NULL; caif_assert(offsetof(struct cfsrvl, layer) == 0); cfsrvl_init(dgm, channel_id, dev_info, true); dgm->layer.receive = cfdgml_receive; dgm->layer.transmit = cfdgml_transmit; snprintf(dgm->layer.name, CAIF_LAYER_NAME_SZ - 1, "dgm%d", channel_id); dgm->layer.name[CAIF_LAYER_NAME_SZ - 1] = '\0'; return &dgm->layer; }

Contributors

PersonTokensPropCommitsCommitProp
Sjur Brændeland11499.13%266.67%
Joe Perches10.87%133.33%
Total115100.00%3100.00%


static int cfdgml_receive(struct cflayer *layr, struct cfpkt *pkt) { u8 cmd = -1; u8 dgmhdr[3]; int ret; caif_assert(layr->up != NULL); caif_assert(layr->receive != NULL); caif_assert(layr->ctrlcmd != NULL); if (cfpkt_extr_head(pkt, &cmd, 1) < 0) { pr_err("Packet is erroneous!\n"); cfpkt_destroy(pkt); return -EPROTO; } if ((cmd & DGM_CMD_BIT) == 0) { if (cfpkt_extr_head(pkt, &dgmhdr, 3) < 0) { pr_err("Packet is erroneous!\n"); cfpkt_destroy(pkt); return -EPROTO; } ret = layr->up->receive(layr->up, pkt); return ret; } switch (cmd) { case DGM_FLOW_OFF: /* FLOW OFF */ layr->ctrlcmd(layr, CAIF_CTRLCMD_FLOW_OFF_IND, 0); cfpkt_destroy(pkt); return 0; case DGM_FLOW_ON: /* FLOW ON */ layr->ctrlcmd(layr, CAIF_CTRLCMD_FLOW_ON_IND, 0); cfpkt_destroy(pkt); return 0; default: cfpkt_destroy(pkt); pr_info("Unknown datagram control %d (0x%x)\n", cmd, cmd); return -EPROTO; } }

Contributors

PersonTokensPropCommitsCommitProp
Sjur Brændeland21698.63%150.00%
Joe Perches31.37%150.00%
Total219100.00%2100.00%


static int cfdgml_transmit(struct cflayer *layr, struct cfpkt *pkt) { u8 packet_type; u32 zero = 0; struct caif_payload_info *info; struct cfsrvl *service = container_obj(layr); int ret; if (!cfsrvl_ready(service, &ret)) { cfpkt_destroy(pkt); return ret; } /* STE Modem cannot handle more than 1500 bytes datagrams */ if (cfpkt_getlen(pkt) > DGM_MTU) { cfpkt_destroy(pkt); return -EMSGSIZE; } cfpkt_add_head(pkt, &zero, 3); packet_type = 0x08; /* B9 set - UNCLASSIFIED */ cfpkt_add_head(pkt, &packet_type, 1); /* Add info for MUX-layer to route the packet out. */ info = cfpkt_info(pkt); info->channel_id = service->layer.id; /* To optimize alignment, we add up the size of CAIF header * before payload. */ info->hdr_len = 4; info->dev_info = &service->dev_info; return layr->dn->transmit(layr->dn, pkt); }

Contributors

PersonTokensPropCommitsCommitProp
Sjur Brændeland14391.08%480.00%
Dmitry Tarnyagin148.92%120.00%
Total157100.00%5100.00%


Overall Contributors

PersonTokensPropCommitsCommitProp
Sjur Brændeland54595.61%666.67%
Dmitry Tarnyagin142.46%111.11%
Joe Perches111.93%222.22%
Total570100.00%9100.00%
Directory: net/caif
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