static int cfrfml_transmit(struct cflayer *layr, struct cfpkt *pkt)
{
u8 tmp = 0;
int ret;
struct cfsrvl *service = container_obj(layr);
caif_assert(layr->dn != NULL);
caif_assert(layr->dn->transmit != NULL);
if (!cfsrvl_ready(service, &ret))
return ret;
if (!cfpkt_getlen(pkt) > CAIF_MAX_PAYLOAD_SIZE) {
pr_err("CAIF: %s():Packet too large - size=%d\n",
__func__, cfpkt_getlen(pkt));
return -EOVERFLOW;
}
if (cfpkt_add_head(pkt, &tmp, 1) < 0) {
pr_err("CAIF: %s(): Packet is erroneous!\n", __func__);
return -EPROTO;
}
/* Add info for MUX-layer to route the packet out. */
cfpkt_info(pkt)->channel_id = service->layer.id;
/*
* To optimize alignment, we add up the size of CAIF header before
* payload.
*/
cfpkt_info(pkt)->hdr_len = 1;
cfpkt_info(pkt)->dev_info = &service->dev_info;
ret = layr->dn->transmit(layr->dn, pkt);
if (ret < 0)
cfpkt_extr_head(pkt, &tmp, 1);
return ret;
}
static int cfvei_transmit(struct cflayer *layr, struct cfpkt *pkt)
{
u8 tmp = 0;
struct caif_payload_info *info;
int ret;
struct cfsrvl *service = container_obj(layr);
if (!cfsrvl_ready(service, &ret))
return ret;
caif_assert(layr->dn != NULL);
caif_assert(layr->dn->transmit != NULL);
if (cfpkt_getlen(pkt) > CAIF_MAX_PAYLOAD_SIZE) {
pr_warning("CAIF: %s(): Packet too large - size=%d\n",
__func__, cfpkt_getlen(pkt));
return -EOVERFLOW;
}
if (cfpkt_add_head(pkt, &tmp, 1) < 0) {
pr_err("CAIF: %s(): Packet is erroneous!\n", __func__);
return -EPROTO;
}
/* Add info-> for MUX-layer to route the packet out. */
info = cfpkt_info(pkt);
info->channel_id = service->layer.id;
info->hdr_len = 1;
info->dev_info = &service->dev_info;
ret = layr->dn->transmit(layr->dn, pkt);
if (ret < 0)
cfpkt_extr_head(pkt, &tmp, 1);
return ret;
}
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))
return ret;
/* STE Modem cannot handle more than 1500 bytes datagrams */
if (cfpkt_getlen(pkt) > DGM_MTU)
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);
}
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;
}
/* */
if (cfpkt_getlen(pkt) > DGM_MTU) {
cfpkt_destroy(pkt);
return -EMSGSIZE;
}
cfpkt_add_head(pkt, &zero, 3);
packet_type = 0x08; /* */
cfpkt_add_head(pkt, &packet_type, 1);
/* */
info = cfpkt_info(pkt);
info->channel_id = service->layer.id;
/*
*/
info->hdr_len = 4;
info->dev_info = &service->dev_info;
return layr->dn->transmit(layr->dn, pkt);
}
int cfpkt_setlen(struct cfpkt *pkt, u16 len)
{
struct sk_buff *skb = pkt_to_skb(pkt);
if (unlikely(is_erronous(pkt)))
return -EPROTO;
if (likely(len <= skb->len)) {
if (unlikely(skb->data_len))
___pskb_trim(skb, len);
else
skb_trim(skb, len);
return cfpkt_getlen(pkt);
}
/* Need to expand SKB */
if (unlikely(!cfpkt_pad_trail(pkt, len - skb->len)))
PKT_ERROR(pkt, "skb_pad_trail failed\n");
return cfpkt_getlen(pkt);
}
int cfpkt_iterate(struct cfpkt *pkt,
u16 (*iter_func)(u16, void *, u16),
u16 data)
{
/*
* Don't care about the performance hit of linearizing,
* Checksum should not be used on high-speed interfaces anyway.
*/
if (unlikely(is_erronous(pkt)))
return -EPROTO;
if (unlikely(skb_linearize(&pkt->skb) != 0)) {
PKT_ERROR(pkt, "linearize failed\n");
return -EPROTO;
}
return iter_func(data, pkt->skb.data, cfpkt_getlen(pkt));
}
