From: Julian Wiedmann <jwi@linux.ibm.com>
Date: Tue, 18 Jun 2019 20:42:59 +0200
Subject: net/af_iucv: remove GFP_DMA restriction for HiperTransport
Git-commit: fdbf6326912d578a31ac4ca0933c919eadf1d54c
Patch-mainline: v5.2-rc1
References: bsc#1142112 bsc#1142221 LTC#179334 LTC#179332

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>
Acked-by: Petr Tesarik <ptesarik@suse.com>
---
 net/iucv/af_iucv.c |    6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

--- a/net/iucv/af_iucv.c
+++ b/net/iucv/af_iucv.c
@@ -589,7 +589,6 @@ static struct sock *iucv_sock_alloc(stru
 
 	sk->sk_destruct = iucv_sock_destruct;
 	sk->sk_sndtimeo = IUCV_CONN_TIMEOUT;
-	sk->sk_allocation = GFP_DMA;
 
 	sock_reset_flag(sk, SOCK_ZAPPED);
 
@@ -783,6 +782,7 @@ 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;
@@ -807,6 +807,8 @@ static int iucv_sock_autobind(struct soc
 		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);
@@ -1783,6 +1785,8 @@ static int iucv_callback_connreq(struct
 
 	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);