af_iucv: remove fragment_skb() to use paged SKBs

Before introducing paged skbs in the receive path, get rid of the
function `iucv_fragment_skb()` that replaces one large linear skb
with several smaller linear skbs.

Signed-off-by: Eugene Crosser <Eugene.Crosser@ru.ibm.com>
Signed-off-by: Ursula Braun <ubraun@linux.vnet.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/iucv/af_iucv.c b/net/iucv/af_iucv.c
index 38448d1..9ed2adf 100644 (file)
--- a/net/iucv/af_iucv.c
+++ b/net/iucv/af_iucv.c
@@ -1231,44 +1231,6 @@ out:
        return err;
 }
 
-/* iucv_fragment_skb() - Fragment a single IUCV message into multiple skb's
- *
- * Locking: must be called with message_q.lock held
- */
-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;
-
-               /* copy target class to control buffer of new skb */
-               IUCV_SKB_CB(nskb)->class = IUCV_SKB_CB(skb)->class;
-
-               /* copy data fragment */
-               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;
-}
-
 /* iucv_process_message() - Receive a single outstanding IUCV message
  *
  * Locking: must be called with message_q.lock held
@@ -1300,24 +1262,9 @@ static void iucv_process_message(struct sock *sk, struct sk_buff *skb,
                        kfree_skb(skb);
                        return;
                }
-               /* we need to fragment iucv messages for SOCK_STREAM only;
-                * for SOCK_SEQPACKET, it is only relevant if we support
-                * record segmentation using MSG_EOR (see also recvmsg()) */
-               if (sk->sk_type == SOCK_STREAM &&
-                   skb->truesize >= sk->sk_rcvbuf / 4) {
-                       rc = iucv_fragment_skb(sk, skb, len);
-                       kfree_skb(skb);
-                       skb = NULL;
-                       if (rc) {
-                               pr_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 = len;
-               }
+               skb_reset_transport_header(skb);
+               skb_reset_network_header(skb);
+               skb->len = len;
        }
 
        IUCV_SKB_CB(skb)->offset = 0;