+static int iucv_fragment_skb(struct sock *sk, struct sk_buff *skb, int len)
+{
+ int dataleft, size, copied = 0;
+ struct sk_buff *nskb;
+
+ dataleft = len;
+ while (dataleft) {
+ if (dataleft >= sk->sk_rcvbuf / 4)
+ size = sk->sk_rcvbuf / 4;
+ else
+ size = dataleft;
+
+ nskb = alloc_skb(size, GFP_ATOMIC | GFP_DMA);
+ if (!nskb)
+ return -ENOMEM;
+
+ memcpy(nskb->data, skb->data + copied, size);
+ copied += size;
+ dataleft -= size;
+
+ skb_reset_transport_header(nskb);
+ skb_reset_network_header(nskb);
+ nskb->len = size;
+
+ skb_queue_tail(&iucv_sk(sk)->backlog_skb_q, nskb);
+ }
+
+ return 0;
+}
+
+static void iucv_process_message(struct sock *sk, struct sk_buff *skb,
+ struct iucv_path *path,
+ struct iucv_message *msg)
+{
+ int rc;
+
+ if (msg->flags & IPRMDATA) {
+ skb->data = NULL;
+ skb->len = 0;
+ } else {
+ rc = iucv_message_receive(path, msg, 0, skb->data,
+ msg->length, NULL);
+ if (rc) {
+ kfree_skb(skb);
+ return;
+ }
+ if (skb->truesize >= sk->sk_rcvbuf / 4) {
+ rc = iucv_fragment_skb(sk, skb, msg->length);
+ kfree_skb(skb);
+ skb = NULL;
+ if (rc) {
+ iucv_path_sever(path, NULL);
+ return;
+ }
+ skb = skb_dequeue(&iucv_sk(sk)->backlog_skb_q);
+ } else {
+ skb_reset_transport_header(skb);
+ skb_reset_network_header(skb);
+ skb->len = msg->length;
+ }
+ }
+
+ if (sock_queue_rcv_skb(sk, skb))
+ skb_queue_head(&iucv_sk(sk)->backlog_skb_q, skb);
+}
+
+static void iucv_process_message_q(struct sock *sk)
+{
+ struct iucv_sock *iucv = iucv_sk(sk);
+ struct sk_buff *skb;
+ struct sock_msg_q *p, *n;
+
+ list_for_each_entry_safe(p, n, &iucv->message_q.list, list) {
+ skb = alloc_skb(p->msg.length, GFP_ATOMIC | GFP_DMA);
+ if (!skb)
+ break;
+ iucv_process_message(sk, skb, p->path, &p->msg);
+ list_del(&p->list);
+ kfree(p);
+ if (!skb_queue_empty(&iucv->backlog_skb_q))
+ break;
+ }
+}
+