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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 | // SPDX-License-Identifier: GPL-2.0-only /* * Copyright (C) ST-Ericsson AB 2010 * Author: Sjur Brendeland */ #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, "dgm%d", channel_id); 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) { 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; } } 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); } |