net/af_iucv: remove GFP_DMA restriction for HiperTransport

af_iucv sockets over z/VM IUCV require that their skbs are allocated
in DMA memory. This restriction doesn't apply to connections over
HiperSockets. So only set this limit for z/VM IUCV sockets, thereby
increasing the likelihood that the large (and linear!) allocations for
HiperTransport messages succeed.

Fixes: 3881ac441f64 ("af_iucv: add HiperSockets transport")
Signed-off-by: Julian Wiedmann <jwi@linux.ibm.com>
Reviewed-by: Ursula Braun <ubraun@linux.ibm.com>
Reviewed-by: Hendrik Brueckner <brueckner@linux.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 36eb8d1..2ee68d2 100644 (file)
--- a/net/iucv/af_iucv.c
+++ b/net/iucv/af_iucv.c
@@ -588,7 +588,6 @@ static struct sock *iucv_sock_alloc(struct socket *sock, int proto, gfp_t prio,
 
        sk->sk_destruct = iucv_sock_destruct;
        sk->sk_sndtimeo = IUCV_CONN_TIMEOUT;
-       sk->sk_allocation = GFP_DMA;
 
        sock_reset_flag(sk, SOCK_ZAPPED);
 
@@ -782,6 +781,7 @@ vm_bind:
                memcpy(iucv->src_user_id, iucv_userid, 8);
                sk->sk_state = IUCV_BOUND;
                iucv->transport = AF_IUCV_TRANS_IUCV;
+               sk->sk_allocation |= GFP_DMA;
                if (!iucv->msglimit)
                        iucv->msglimit = IUCV_QUEUELEN_DEFAULT;
                goto done_unlock;
@@ -806,6 +806,8 @@ static int iucv_sock_autobind(struct sock *sk)
                return -EPROTO;
 
        memcpy(iucv->src_user_id, iucv_userid, 8);
+       iucv->transport = AF_IUCV_TRANS_IUCV;
+       sk->sk_allocation |= GFP_DMA;
 
        write_lock_bh(&iucv_sk_list.lock);
        __iucv_auto_name(iucv);
@@ -1781,6 +1783,8 @@ static int iucv_callback_connreq(struct iucv_path *path,
 
        niucv = iucv_sk(nsk);
        iucv_sock_init(nsk, sk);
+       niucv->transport = AF_IUCV_TRANS_IUCV;
+       nsk->sk_allocation |= GFP_DMA;
 
        /* Set the new iucv_sock */
        memcpy(niucv->dst_name, ipuser + 8, 8);