From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753525AbdEQEQn (ORCPT ); Wed, 17 May 2017 00:16:43 -0400 Received: from mx1.redhat.com ([209.132.183.28]:57936 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753348AbdEQEPi (ORCPT ); Wed, 17 May 2017 00:15:38 -0400 DMARC-Filter: OpenDMARC Filter v1.3.2 mx1.redhat.com DC0EE83F3F Authentication-Results: ext-mx03.extmail.prod.ext.phx2.redhat.com; dmarc=none (p=none dis=none) header.from=redhat.com Authentication-Results: ext-mx03.extmail.prod.ext.phx2.redhat.com; spf=pass smtp.mailfrom=jasowang@redhat.com DKIM-Filter: OpenDKIM Filter v2.11.0 mx1.redhat.com DC0EE83F3F From: Jason Wang To: mst@redhat.com, netdev@vger.kernel.org, linux-kernel@vger.kernel.org Cc: Jason Wang Subject: [PATCH net-next V5 7/9] tun: support receiving skb through msg_control Date: Wed, 17 May 2017 12:14:43 +0800 Message-Id: <1494994485-12994-8-git-send-email-jasowang@redhat.com> In-Reply-To: <1494994485-12994-1-git-send-email-jasowang@redhat.com> References: <1494994485-12994-1-git-send-email-jasowang@redhat.com> X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.27]); Wed, 17 May 2017 04:15:38 +0000 (UTC) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This patch makes tun_recvmsg() can receive from skb from its caller through msg_control. Vhost_net will be the first user. Signed-off-by: Jason Wang --- drivers/net/tun.c | 18 ++++++++++-------- 1 file changed, 10 insertions(+), 8 deletions(-) diff --git a/drivers/net/tun.c b/drivers/net/tun.c index 3cbfc5c..f8041f9c 100644 --- a/drivers/net/tun.c +++ b/drivers/net/tun.c @@ -1510,9 +1510,8 @@ static struct sk_buff *tun_ring_recv(struct tun_file *tfile, int noblock, static ssize_t tun_do_read(struct tun_struct *tun, struct tun_file *tfile, struct iov_iter *to, - int noblock) + int noblock, struct sk_buff *skb) { - struct sk_buff *skb; ssize_t ret; int err; @@ -1521,10 +1520,12 @@ static ssize_t tun_do_read(struct tun_struct *tun, struct tun_file *tfile, if (!iov_iter_count(to)) return 0; - /* Read frames from ring */ - skb = tun_ring_recv(tfile, noblock, &err); - if (!skb) - return err; + if (!skb) { + /* Read frames from ring */ + skb = tun_ring_recv(tfile, noblock, &err); + if (!skb) + return err; + } ret = tun_put_user(tun, tfile, skb, to); if (unlikely(ret < 0)) @@ -1544,7 +1545,7 @@ static ssize_t tun_chr_read_iter(struct kiocb *iocb, struct iov_iter *to) if (!tun) return -EBADFD; - ret = tun_do_read(tun, tfile, to, file->f_flags & O_NONBLOCK); + ret = tun_do_read(tun, tfile, to, file->f_flags & O_NONBLOCK, NULL); ret = min_t(ssize_t, ret, len); if (ret > 0) iocb->ki_pos = ret; @@ -1646,7 +1647,8 @@ static int tun_recvmsg(struct socket *sock, struct msghdr *m, size_t total_len, SOL_PACKET, TUN_TX_TIMESTAMP); goto out; } - ret = tun_do_read(tun, tfile, &m->msg_iter, flags & MSG_DONTWAIT); + ret = tun_do_read(tun, tfile, &m->msg_iter, flags & MSG_DONTWAIT, + m->msg_control); if (ret > (ssize_t)total_len) { m->msg_flags |= MSG_TRUNC; ret = flags & MSG_TRUNC ? ret : total_len; -- 2.7.4