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113 lines
2.8 KiB
113 lines
2.8 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* Copyright (C) ST-Ericsson AB 2010 |
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* Author: Sjur Brendeland |
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*/ |
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#define pr_fmt(fmt) KBUILD_MODNAME ":%s(): " fmt, __func__ |
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#include <linux/stddef.h> |
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#include <linux/spinlock.h> |
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#include <linux/slab.h> |
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#include <net/caif/caif_layer.h> |
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#include <net/caif/cfsrvl.h> |
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#include <net/caif/cfpkt.h> |
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#define container_obj(layr) ((struct cfsrvl *) layr) |
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#define DGM_CMD_BIT 0x80 |
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#define DGM_FLOW_OFF 0x81 |
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#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); |
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static int cfdgml_transmit(struct cflayer *layr, struct cfpkt *pkt); |
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struct cflayer *cfdgml_create(u8 channel_id, struct dev_info *dev_info) |
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{ |
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struct cfsrvl *dgm = kzalloc(sizeof(struct cfsrvl), GFP_ATOMIC); |
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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; |
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dgm->layer.transmit = cfdgml_transmit; |
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snprintf(dgm->layer.name, CAIF_LAYER_NAME_SZ, "dgm%d", channel_id); |
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return &dgm->layer; |
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} |
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static int cfdgml_receive(struct cflayer *layr, struct cfpkt *pkt) |
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{ |
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u8 cmd = -1; |
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u8 dgmhdr[3]; |
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int ret; |
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caif_assert(layr->up != NULL); |
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caif_assert(layr->receive != NULL); |
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caif_assert(layr->ctrlcmd != NULL); |
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if (cfpkt_extr_head(pkt, &cmd, 1) < 0) { |
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pr_err("Packet is erroneous!\n"); |
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cfpkt_destroy(pkt); |
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return -EPROTO; |
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} |
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if ((cmd & DGM_CMD_BIT) == 0) { |
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if (cfpkt_extr_head(pkt, &dgmhdr, 3) < 0) { |
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pr_err("Packet is erroneous!\n"); |
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cfpkt_destroy(pkt); |
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return -EPROTO; |
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} |
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ret = layr->up->receive(layr->up, pkt); |
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return ret; |
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} |
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switch (cmd) { |
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case DGM_FLOW_OFF: /* FLOW OFF */ |
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layr->ctrlcmd(layr, CAIF_CTRLCMD_FLOW_OFF_IND, 0); |
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cfpkt_destroy(pkt); |
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return 0; |
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case DGM_FLOW_ON: /* FLOW ON */ |
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layr->ctrlcmd(layr, CAIF_CTRLCMD_FLOW_ON_IND, 0); |
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cfpkt_destroy(pkt); |
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return 0; |
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default: |
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cfpkt_destroy(pkt); |
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pr_info("Unknown datagram control %d (0x%x)\n", cmd, cmd); |
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return -EPROTO; |
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} |
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} |
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static int cfdgml_transmit(struct cflayer *layr, struct cfpkt *pkt) |
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{ |
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u8 packet_type; |
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u32 zero = 0; |
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struct caif_payload_info *info; |
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struct cfsrvl *service = container_obj(layr); |
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int ret; |
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if (!cfsrvl_ready(service, &ret)) { |
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cfpkt_destroy(pkt); |
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return ret; |
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} |
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/* STE Modem cannot handle more than 1500 bytes datagrams */ |
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if (cfpkt_getlen(pkt) > DGM_MTU) { |
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cfpkt_destroy(pkt); |
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return -EMSGSIZE; |
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} |
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cfpkt_add_head(pkt, &zero, 3); |
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packet_type = 0x08; /* B9 set - UNCLASSIFIED */ |
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cfpkt_add_head(pkt, &packet_type, 1); |
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/* Add info for MUX-layer to route the packet out. */ |
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info = cfpkt_info(pkt); |
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info->channel_id = service->layer.id; |
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/* To optimize alignment, we add up the size of CAIF header |
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* before payload. |
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*/ |
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info->hdr_len = 4; |
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info->dev_info = &service->dev_info; |
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return layr->dn->transmit(layr->dn, pkt); |
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}
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