From patchwork Fri Jan 9 11:51:33 2009 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mark McLoughlin X-Patchwork-Id: 1573 Received: from vger.kernel.org (vger.kernel.org [209.132.176.167]) by demeter.kernel.org (8.14.2/8.14.2) with ESMTP id n09Bm5RV012179 for ; Fri, 9 Jan 2009 03:48:05 -0800 Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752782AbZAILvp (ORCPT ); Fri, 9 Jan 2009 06:51:45 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752763AbZAILvp (ORCPT ); Fri, 9 Jan 2009 06:51:45 -0500 Received: from mx2.redhat.com ([66.187.237.31]:37994 "EHLO mx2.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752698AbZAILvo (ORCPT ); Fri, 9 Jan 2009 06:51:44 -0500 Received: from int-mx2.corp.redhat.com (int-mx2.corp.redhat.com [172.16.27.26]) by mx2.redhat.com (8.13.8/8.13.8) with ESMTP id n09Bpc1O012134; Fri, 9 Jan 2009 06:51:38 -0500 Received: from ns3.rdu.redhat.com (ns3.rdu.redhat.com [10.11.255.199]) by int-mx2.corp.redhat.com (8.13.1/8.13.1) with ESMTP id n09Bpc3O014133; Fri, 9 Jan 2009 06:51:38 -0500 Received: from [127.0.0.1] (sebastian-int.corp.redhat.com [172.16.52.221]) by ns3.rdu.redhat.com (8.13.8/8.13.8) with ESMTP id n09BpaFO026305; Fri, 9 Jan 2009 06:51:37 -0500 Subject: Re: [PATCH] virtio_net: add link status handling From: Mark McLoughlin Reply-To: Mark McLoughlin To: David Miller Cc: Anthony Liguori , netdev , kvm , Rusty Russell In-Reply-To: <1231352283.5050.76.camel@localhost.localdomain> References: <1228817973.26198.1.camel@blaa> <493F336B.5010402@codemonkey.ws> <1228934084.5384.66.camel@blaa> <200812121834.49464.rusty@rustcorp.com.au> <1231352283.5050.76.camel@localhost.localdomain> Date: Fri, 09 Jan 2009 11:51:33 +0000 Message-Id: <1231501893.4481.81.camel@localhost.localdomain> Mime-Version: 1.0 X-Scanned-By: MIMEDefang 2.58 on 172.16.27.26 Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org Hi Dave, On Wed, 2009-01-07 at 18:18 +0000, Mark McLoughlin wrote: > On Fri, 2008-12-12 at 18:34 +1030, Rusty Russell wrote: > > Not quite what I was after. I've taken the original patch, added the > > masking change. I'll test here and feed to DaveM. > > This never got pushed to davem, did it? What you've got in your queue > looks fine to me ... Here's a virtio-net patch from Rusty's queue which appears just to have fallen through the cracks. Thanks, Mark. Subject: virtio_net: add link status handling Date: Tue, 09 Dec 2008 10:19:33 +0000 From: Mark McLoughlin Allow the host to inform us that the link is down by adding a VIRTIO_NET_F_STATUS which indicates that device status is available in virtio_net config. This is currently useful for simulating link down conditions (e.g. using proposed qemu 'set_link' monitor command) but would also be needed if we were to support device assignment via virtio. Signed-off-by: Mark McLoughlin Signed-off-by: Rusty Russell (added future masking) --- drivers/net/virtio_net.c | 43 ++++++++++++++++++++++++++++++++++++++++++- include/linux/virtio_net.h | 5 +++++ 2 files changed, 47 insertions(+), 1 deletion(-) -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c index 71ca29c..128c38d 100644 --- a/drivers/net/virtio_net.c +++ b/drivers/net/virtio_net.c @@ -42,6 +42,7 @@ struct virtnet_info struct virtqueue *rvq, *svq; struct net_device *dev; struct napi_struct napi; + unsigned int status; /* The skb we couldn't send because buffers were full. */ struct sk_buff *last_xmit_skb; @@ -611,6 +612,7 @@ static struct ethtool_ops virtnet_ethtool_ops = { .set_tx_csum = virtnet_set_tx_csum, .set_sg = ethtool_op_set_sg, .set_tso = ethtool_op_set_tso, + .get_link = ethtool_op_get_link, }; #define MIN_MTU 68 @@ -624,6 +626,41 @@ static int virtnet_change_mtu(struct net_device *dev, int new_mtu) return 0; } +static void virtnet_update_status(struct virtnet_info *vi) +{ + u16 v; + + if (!virtio_has_feature(vi->vdev, VIRTIO_NET_F_STATUS)) + return; + + vi->vdev->config->get(vi->vdev, + offsetof(struct virtio_net_config, status), + &v, sizeof(v)); + + /* Ignore unknown (future) status bits */ + v &= VIRTIO_NET_S_LINK_UP; + + if (vi->status == v) + return; + + vi->status = v; + + if (vi->status & VIRTIO_NET_S_LINK_UP) { + netif_carrier_on(vi->dev); + netif_wake_queue(vi->dev); + } else { + netif_carrier_off(vi->dev); + netif_stop_queue(vi->dev); + } +} + +static void virtnet_config_changed(struct virtio_device *vdev) +{ + struct virtnet_info *vi = vdev->priv; + + virtnet_update_status(vi); +} + static int virtnet_probe(struct virtio_device *vdev) { int err; @@ -732,6 +766,9 @@ static int virtnet_probe(struct virtio_device *vdev) goto unregister; } + vi->status = VIRTIO_NET_S_LINK_UP; + virtnet_update_status(vi); + pr_debug("virtnet: registered device %s\n", dev->name); return 0; @@ -787,7 +824,7 @@ static unsigned int features[] = { VIRTIO_NET_F_HOST_TSO4, VIRTIO_NET_F_HOST_UFO, VIRTIO_NET_F_HOST_TSO6, VIRTIO_NET_F_HOST_ECN, VIRTIO_NET_F_GUEST_TSO4, VIRTIO_NET_F_GUEST_TSO6, VIRTIO_NET_F_GUEST_ECN, /* We don't yet handle UFO input. */ - VIRTIO_NET_F_MRG_RXBUF, + VIRTIO_NET_F_MRG_RXBUF, VIRTIO_NET_F_STATUS, VIRTIO_F_NOTIFY_ON_EMPTY, }; @@ -799,6 +836,7 @@ static struct virtio_driver virtio_net = { .id_table = id_table, .probe = virtnet_probe, .remove = __devexit_p(virtnet_remove), + .config_changed = virtnet_config_changed, }; static int __init init(void) diff --git a/include/linux/virtio_net.h b/include/linux/virtio_net.h index 5cdd0aa..f76bd4a 100644 --- a/include/linux/virtio_net.h +++ b/include/linux/virtio_net.h @@ -21,11 +21,16 @@ #define VIRTIO_NET_F_HOST_ECN 13 /* Host can handle TSO[6] w/ ECN in. */ #define VIRTIO_NET_F_HOST_UFO 14 /* Host can handle UFO in. */ #define VIRTIO_NET_F_MRG_RXBUF 15 /* Host can merge receive buffers. */ +#define VIRTIO_NET_F_STATUS 16 /* virtio_net_config.status available */ + +#define VIRTIO_NET_S_LINK_UP 1 /* Link is up */ struct virtio_net_config { /* The config defining mac address (if VIRTIO_NET_F_MAC) */ __u8 mac[6]; + /* See VIRTIO_NET_F_STATUS and VIRTIO_NET_S_* above */ + __u16 status; } __attribute__((packed)); /* This is the first element of the scatter-gather list. 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