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net/caif/cfdgml.c
2.83 KB
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/* * Copyright (C) ST-Ericsson AB 2010 * Author: Sjur Brendeland/sjur.brandeland@stericsson.com * License terms: GNU General Public License (GPL) version 2 */ |
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#define pr_fmt(fmt) KBUILD_MODNAME ":%s(): " fmt, __func__ |
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#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> |
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#define container_obj(layr) ((struct cfsrvl *) layr) #define DGM_CMD_BIT 0x80 #define DGM_FLOW_OFF 0x81 #define DGM_FLOW_ON 0x80 |
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#define DGM_MTU 1500 |
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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) { |
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struct cfsrvl *dgm = kzalloc(sizeof(struct cfsrvl), GFP_ATOMIC); if (!dgm) |
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return NULL; |
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caif_assert(offsetof(struct cfsrvl, layer) == 0); |
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cfsrvl_init(dgm, channel_id, dev_info, true); |
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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; } 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) { |
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pr_err("Packet is erroneous! "); |
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cfpkt_destroy(pkt); return -EPROTO; } if ((cmd & DGM_CMD_BIT) == 0) { if (cfpkt_extr_head(pkt, &dgmhdr, 3) < 0) { |
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pr_err("Packet is erroneous! "); |
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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); |
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pr_info("Unknown datagram control %d (0x%x) ", cmd, cmd); |
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return -EPROTO; } } static int cfdgml_transmit(struct cflayer *layr, struct cfpkt *pkt) { |
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u8 packet_type; |
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u32 zero = 0; struct caif_payload_info *info; struct cfsrvl *service = container_obj(layr); int ret; if (!cfsrvl_ready(service, &ret)) return ret; |
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/* STE Modem cannot handle more than 1500 bytes datagrams */ if (cfpkt_getlen(pkt) > DGM_MTU) return -EMSGSIZE; |
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cfpkt_add_head(pkt, &zero, 3); packet_type = 0x08; /* B9 set - UNCLASSIFIED */ cfpkt_add_head(pkt, &packet_type, 1); |
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/* 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; |
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return layr->dn->transmit(layr->dn, pkt); |
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} |