From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: From: Julian Wiedmann Subject: [PATCH net-next 5/5] net/af_iucv: build SG skbs for TRANS_HIPER sockets Date: Thu, 28 Jan 2021 12:41:08 +0100 Message-Id: <20210128114108.39409-6-jwi@linux.ibm.com> In-Reply-To: <20210128114108.39409-1-jwi@linux.ibm.com> References: <20210128114108.39409-1-jwi@linux.ibm.com> List-ID: To: David Miller , Jakub Kicinski Cc: linux-netdev , linux-s390 , Heiko Carstens , Karsten Graul , Julian Wiedmann The TX path no longer falls apart when some of its SG skbs are later linearized by lower layers of the stack. So enable the use of SG skbs in iucv_sock_sendmsg() again. This effectively reverts commit dc5367bcc556 ("net/af_iucv: don't use paged skbs for TX on HiperSockets"). Signed-off-by: Julian Wiedmann --- net/iucv/af_iucv.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/net/iucv/af_iucv.c b/net/iucv/af_iucv.c index 0e0656db4ae7..6092d5cb7168 100644 --- a/net/iucv/af_iucv.c +++ b/net/iucv/af_iucv.c @@ -256,7 +256,9 @@ static int afiucv_hs_send(struct iucv_message *imsg, struct sock *sock, err = -EMSGSIZE; goto err_free; } - skb_trim(skb, skb->dev->mtu); + err = pskb_trim(skb, skb->dev->mtu); + if (err) + goto err_free; } skb->protocol = cpu_to_be16(ETH_P_AF_IUCV); @@ -996,7 +998,7 @@ static int iucv_sock_sendmsg(struct socket *sock, struct msghdr *msg, if (iucv->transport == AF_IUCV_TRANS_HIPER) { headroom = sizeof(struct af_iucv_trans_hdr) + LL_RESERVED_SPACE(iucv->hs_dev); - linear = len; + linear = min(len, PAGE_SIZE - headroom); } else { if (len < PAGE_SIZE) { linear = len; -- 2.17.1