git://bbs.cooldavid.org / net-next-2.6.git / blame
| Commit | Line | Data |
|---|---|---|
| b482cd20 SB |
1 | /* |
| 2 | * Copyright (C) ST-Ericsson AB 2010 | |
| 3 | * Author: Sjur Brendeland/sjur.brandeland@stericsson.com | |
| 4 | * License terms: GNU General Public License (GPL) version 2 | |
| 5 | */ | |
| 6 | ||
| 7 | #include <linux/stddef.h> | |
| 8 | #include <linux/spinlock.h> | |
| 9 | #include <linux/slab.h> | |
| 10 | #include <net/caif/caif_layer.h> | |
| 11 | #include <net/caif/cfsrvl.h> | |
| 12 | #include <net/caif/cfpkt.h> | |
| 13 | ||
| 14 | #define container_obj(layr) ((struct cfsrvl *) layr) | |
| 15 | ||
| 16 | #define DGM_CMD_BIT 0x80 | |
| 17 | #define DGM_FLOW_OFF 0x81 | |
| 18 | #define DGM_FLOW_ON 0x80 | |
| 19 | #define DGM_CTRL_PKT_SIZE 1 | |
| 2aa40aef | 20 | #define DGM_MTU 1500 |
| b482cd20 SB |
21 | |
| 22 | static int cfdgml_receive(struct cflayer *layr, struct cfpkt *pkt); | |
| 23 | static int cfdgml_transmit(struct cflayer *layr, struct cfpkt *pkt); | |
| 24 | ||
| 25 | struct cflayer *cfdgml_create(u8 channel_id, struct dev_info *dev_info) | |
| 26 | { | |
| 27 | struct cfsrvl *dgm = kmalloc(sizeof(struct cfsrvl), GFP_ATOMIC); | |
| 28 | if (!dgm) { | |
| 29 | pr_warning("CAIF: %s(): Out of memory\n", __func__); | |
| 30 | return NULL; | |
| 31 | } | |
| 32 | caif_assert(offsetof(struct cfsrvl, layer) == 0); | |
| 33 | memset(dgm, 0, sizeof(struct cfsrvl)); | |
| b1c74247 | 34 | cfsrvl_init(dgm, channel_id, dev_info, true); |
| b482cd20 SB |
35 | dgm->layer.receive = cfdgml_receive; |
| 36 | dgm->layer.transmit = cfdgml_transmit; | |
| 37 | snprintf(dgm->layer.name, CAIF_LAYER_NAME_SZ - 1, "dgm%d", channel_id); | |
| 38 | dgm->layer.name[CAIF_LAYER_NAME_SZ - 1] = '\0'; | |
| 39 | return &dgm->layer; | |
| 40 | } | |
| 41 | ||
| 42 | static int cfdgml_receive(struct cflayer *layr, struct cfpkt *pkt) | |
| 43 | { | |
| 44 | u8 cmd = -1; | |
| 45 | u8 dgmhdr[3]; | |
| 46 | int ret; | |
| 47 | caif_assert(layr->up != NULL); | |
| 48 | caif_assert(layr->receive != NULL); | |
| 49 | caif_assert(layr->ctrlcmd != NULL); | |
| 50 | ||
| 51 | if (cfpkt_extr_head(pkt, &cmd, 1) < 0) { | |
| 52 | pr_err("CAIF: %s(): Packet is erroneous!\n", __func__); | |
| 53 | cfpkt_destroy(pkt); | |
| 54 | return -EPROTO; | |
| 55 | } | |
| 56 | ||
| 57 | if ((cmd & DGM_CMD_BIT) == 0) { | |
| 58 | if (cfpkt_extr_head(pkt, &dgmhdr, 3) < 0) { | |
| 59 | pr_err("CAIF: %s(): Packet is erroneous!\n", __func__); | |
| 60 | cfpkt_destroy(pkt); | |
| 61 | return -EPROTO; | |
| 62 | } | |
| 63 | ret = layr->up->receive(layr->up, pkt); | |
| 64 | return ret; | |
| 65 | } | |
| 66 | ||
| 67 | switch (cmd) { | |
| 68 | case DGM_FLOW_OFF: /* FLOW OFF */ | |
| 69 | layr->ctrlcmd(layr, CAIF_CTRLCMD_FLOW_OFF_IND, 0); | |
| 70 | cfpkt_destroy(pkt); | |
| 71 | return 0; | |
| 72 | case DGM_FLOW_ON: /* FLOW ON */ | |
| 73 | layr->ctrlcmd(layr, CAIF_CTRLCMD_FLOW_ON_IND, 0); | |
| 74 | cfpkt_destroy(pkt); | |
| 75 | return 0; | |
| 76 | default: | |
| 77 | cfpkt_destroy(pkt); | |
| 78 | pr_info("CAIF: %s(): Unknown datagram control %d (0x%x)\n", | |
| 79 | __func__, cmd, cmd); | |
| 80 | return -EPROTO; | |
| 81 | } | |
| 82 | } | |
| 83 | ||
| 84 | static int cfdgml_transmit(struct cflayer *layr, struct cfpkt *pkt) | |
| 85 | { | |
| 86 | u32 zero = 0; | |
| 87 | struct caif_payload_info *info; | |
| 88 | struct cfsrvl *service = container_obj(layr); | |
| 89 | int ret; | |
| 90 | if (!cfsrvl_ready(service, &ret)) | |
| 91 | return ret; | |
| 92 | ||
| 2aa40aef SB |
93 | /* STE Modem cannot handle more than 1500 bytes datagrams */ |
| 94 | if (cfpkt_getlen(pkt) > DGM_MTU) | |
| 95 | return -EMSGSIZE; | |
| 96 | ||
| b482cd20 SB |
97 | cfpkt_add_head(pkt, &zero, 4); |
| 98 | ||
| 99 | /* Add info for MUX-layer to route the packet out. */ | |
| 100 | info = cfpkt_info(pkt); | |
| 101 | info->channel_id = service->layer.id; | |
| 102 | /* To optimize alignment, we add up the size of CAIF header | |
| 103 | * before payload. | |
| 104 | */ | |
| 105 | info->hdr_len = 4; | |
| 106 | info->dev_info = &service->dev_info; | |
| 107 | ret = layr->dn->transmit(layr->dn, pkt); | |
| 108 | if (ret < 0) { | |
| 109 | u32 tmp32; | |
| 110 | cfpkt_extr_head(pkt, &tmp32, 4); | |
| 111 | } | |
| 112 | return ret; | |
| 113 | } |