static int rx_frames_from_dev(struct mem_link_device *mld,
struct mem_ipc_device *dev)
{
struct link_device *ld = &mld->link_dev;
struct sk_buff_head *skb_rxq = dev->skb_rxq;
unsigned int qsize = get_rxq_buff_size(dev);
unsigned int in = get_rxq_head(dev);
unsigned int out = get_rxq_tail(dev);
unsigned int size = circ_get_usage(qsize, in, out);
int rcvd = 0;
if (unlikely(circ_empty(in, out)))
return 0;
while (rcvd < size) {
struct sk_buff *skb;
u8 ch;
struct io_device *iod;
skb = rxq_read(mld, dev, in);
if (!skb)
break;
ch = sipc5_get_ch(skb->data);
iod = link_get_iod_with_channel(ld, ch);
if (!iod) {
mif_err("%s: ERR! No IOD for CH.%d\n", ld->name, ch);
dev_kfree_skb_any(skb);
mem_forced_cp_crash(mld);
break;
}
/* Record the IO device and the link device into the &skb->cb */
skbpriv(skb)->iod = iod;
skbpriv(skb)->ld = ld;
skbpriv(skb)->lnk_hdr = iod->link_header;
skbpriv(skb)->sipc_ch = ch;
/* The $rcvd must be accumulated here, because $skb can be freed
in pass_skb_to_demux(). */
rcvd += skb->len;
if (likely(sipc_ps_ch(ch)))
skb_queue_tail(skb_rxq, skb);
else
pass_skb_to_demux(mld, skb);
}
if (rcvd < size) {
struct link_device *ld = &mld->link_dev;
mif_err("%s: WARN! rcvd %d < size %d\n", ld->name, rcvd, size);
}
return rcvd;
}
/**
@brief extract all IPC link frames from a circular queue
In a while loop,\n
1) Receives each IPC link frame stored in the @b @@dev RXQ.\n
2) If the frame is a PS (network) data frame, stores it to an skb_rxq and
schedules a delayed work for PS data reception.\n
3) Otherwise, passes it to the DEMUX layer immediately.\n
@param mld the pointer to a mem_link_device instance
@param dev the pointer to a mem_ipc_device instance (IPC_FMT, etc.)
@retval "> 0" if valid data received
@retval "= 0" if no data received
@retval "< 0" if ANY error
*/
static int rx_frames_from_dev(struct mem_link_device *mld,
struct mem_ipc_device *dev)
{
struct sk_buff_head *skb_rxq = dev->skb_rxq;
unsigned int qsize = get_rxq_buff_size(dev);
unsigned int in = get_rxq_head(dev);
unsigned int out = get_rxq_tail(dev);
unsigned int size = circ_get_usage(qsize, in, out);
int rcvd = 0;
if (unlikely(circ_empty(in, out)))
return 0;
while (rcvd < size) {
struct sk_buff *skb;
skb = rxq_read(mld, dev, in);
if (!skb)
break;
/* The $rcvd must be accumulated here, because $skb can be freed
in pass_skb_to_demux(). */
rcvd += skb->len;
if (likely(sipc_ps_ch(sipc5_get_ch_id(skb->data))))
skb_queue_tail(skb_rxq, skb);
else
pass_skb_to_demux(mld, skb);
}
#ifdef DEBUG_MODEM_IF
if (rcvd < size) {
struct link_device *ld = &mld->link_dev;
mif_err("%s: WARN! rcvd %d < size %d\n", ld->name, rcvd, size);
}
#endif
return rcvd;
}