static int sipc4_check_data(struct sipc4_rx_data *data, char *buf, int rest)
{
struct net_device *dev = data->dev;
struct sk_buff *skb = data->skb;
struct sipc_rx_hdr *hdr = data->rx_hdr;
int head_size = sipc4_get_header_size(data->format);
int data_size = sipc4_get_hdlc_size(hdr->hdr, data->format) - head_size;
int alloc_size = data_size;
int len;
struct sk_buff *skb_new;
int err;
if (!skb) {
switch (data->format) {
case SIPC4_RFS:
/* Send the RFS header to RILD*/
alloc_size = sipc_min(data_size, rest) + head_size;
skb = sipc4_alloc_skb(dev, alloc_size);
if (unlikely(!skb))
return -ENOMEM;
memcpy(skb_put(skb, head_size), hdr->hdr, head_size);
break;
default:
skb = sipc4_alloc_skb(dev, alloc_size);
if (unlikely(!skb))
return -ENOMEM;
break;
}
data->skb = skb;
} else {
switch (data->format) {
case SIPC4_RFS:
alloc_size = sipc_min(data_size - hdr->flag_len, rest);
skb_new = sipc4_alloc_skb(data->dev, alloc_size);
if (unlikely(!skb_new))
return -ENOMEM;
err = sipc4_hdlc_format_rx(data);
if (err < 0) {
dev_kfree_skb_any(skb_new);
return err;
}
skb = data->skb = skb_new;
break;
default:
/* do noting, IPC,RAW MTU is 1500byte */
break;
}
}
/* handle data */
len = sipc_min(rest, alloc_size - skb->len);
memcpy(skb_put(skb, len), buf, len);
hdr->flag_len += len;
return len;
}
int sipc4_rx(struct sipc4_rx_data *data)
{
struct net_device *dev = data->dev;
struct sk_buff *skb;
/* non HDLC frame */
if (!(data->flags & SIPC4_RX_HDLC)) {
int ch = SIPC4_NOT_HDLC_CH;
/* get socket buffer */
if (!data->skb) {
skb = sipc4_alloc_skb(dev, 0);
if (!skb)
return -ENOMEM;
data->skb = skb;
} else
skb = data->skb;
/* handle data */
skb_add_rx_frag(skb, skb_shinfo(skb)->nr_frags, data->page, 0,
data->size);
/* rx data */
if (data->flags & SIPC4_RX_LAST) {
data->skb = NULL;
sipc4_netif_rx(dev, skb, SIPC4_RES(SIPC4_FMT, ch));
}
return 0;
}
return sipc4_hdlc_rx(data);
}
static int sipc4_check_header(struct sipc4_rx_data *data, char *buf, int rest)
{
struct sk_buff *skb = data->skb;
int header_size = sipc4_get_header_size(data->format);
int done_len = 0;
int len = 0;
if (!skb) {
len = sipc4_check_hdlc_start(data, buf, rest);
if (len < 0)
return len;
buf += len;
rest -= len;
done_len += len;
skb = sipc4_alloc_skb(data, header_size);
if (!skb)
return -ENOMEM;
data->skb = skb;
}
if (skb->len < header_size) {
len = header_size - skb->len;
len = rest < len ? rest : len;
memcpy(skb_put(skb, len), buf, len);
done_len += len;
}
return done_len;
}
static int sipc4_check_data(struct sipc4_rx_data *data, char *buf, int rest,
const __be16 protocol)
{
struct sk_buff *skb = data->skb;
struct sipc4_rx_frag *frag = (struct sipc4_rx_frag *)skb->cb;
struct page *page;
int header_size = sipc4_get_header_size(data->format);
int hdlc_size = sipc4_get_hdlc_size(skb->data, data->format);
int data_size = hdlc_size - header_size;
int skb_data_size = skb->data_len + frag->data_len;
int rest_data_size = data_size - skb_data_size;
int len;
int skb_max_pages = MAX_SKB_FRAGS;
len = rest < rest_data_size ? rest : rest_data_size;
page = __netdev_alloc_page(data->dev, GFP_ATOMIC);
if (!page) {
pr_err("%s - failed to alloc netdev page\n", __func__);
return -ENOMEM;
}
if (data->format == SIPC4_RFS)
skb_max_pages = 1;
/* check fragment number */
if (skb_shinfo(skb)->nr_frags >= skb_max_pages) {
struct sk_buff *skb_new;
int err;
skb_new = sipc4_alloc_skb(data, header_size);
if (!skb) {
pr_err("%s - failed to alloc skb\n", __func__);
return -ENOMEM;
}
memcpy(skb_put(skb_new, header_size), skb->data, header_size);
memcpy(skb_new->cb, skb->cb, sizeof(struct sipc4_rx_frag));
frag = (struct sipc4_rx_frag *)skb_new->cb;
frag->data_len += skb->data_len;
err = sipc4_hdlc_format_rx(data, protocol);
if (err < 0) {
pr_err("%s - failed to rx data\n", __func__);
dev_kfree_skb_any(skb_new);
return err;
}
skb = data->skb = skb_new;
}
/* handle data */
memcpy(page_address(page), buf, len);
skb_add_rx_frag(skb, skb_shinfo(skb)->nr_frags, page, 0, len);
return len;
}
