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Date: Thu, 21 Feb 2013 17:41:28 +0800
From: Jason Wang <jasowang@...hat.com>
To: gaowanlong@...fujitsu.com
CC: Rusty Russell <rusty@...tcorp.com.au>,
Paolo Bonzini <pbonzini@...hat.com>,
virtualization@...ts.linux-foundation.org,
linux-kernel@...r.kernel.org, "Michael S. Tsirkin" <mst@...hat.com>
Subject: Re: [PATCH 10/16] virtio_net: use virtqueue_add_sgs[] for command
buffers.
On 02/21/2013 04:30 PM, Wanlong Gao wrote:
> On 02/19/2013 03:56 PM, Rusty Russell wrote:
>> It's a bit cleaner to hand multiple sgs, rather than one big one.
>>
>> Signed-off-by: Rusty Russell <rusty@...tcorp.com.au>
>> ---
>> drivers/net/virtio_net.c | 50 ++++++++++++++++++++++------------------------
>> 1 file changed, 24 insertions(+), 26 deletions(-)
>>
>> diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
>> index 8ca69c0..63ac5c1 100644
>> --- a/drivers/net/virtio_net.c
>> +++ b/drivers/net/virtio_net.c
>> @@ -39,7 +39,6 @@ module_param(gso, bool, 0444);
>> #define MAX_PACKET_LEN (ETH_HLEN + VLAN_HLEN + ETH_DATA_LEN)
>> #define GOOD_COPY_LEN 128
>>
>> -#define VIRTNET_SEND_COMMAND_SG_MAX 2
>> #define VIRTNET_DRIVER_VERSION "1.0.0"
>>
>> struct virtnet_stats {
>> @@ -831,32 +830,32 @@ static void virtnet_netpoll(struct net_device *dev)
>> * never fail unless improperly formated.
>> */
>> static bool virtnet_send_command(struct virtnet_info *vi, u8 class, u8 cmd,
>> - struct scatterlist *data, int out, int in)
>> + struct scatterlist *out,
>> + struct scatterlist *in)
>> {
>> - struct scatterlist *s, sg[VIRTNET_SEND_COMMAND_SG_MAX + 2];
>> + struct scatterlist *sgs[4], hdr, stat;
>> struct virtio_net_ctrl_hdr ctrl;
>> virtio_net_ctrl_ack status = ~0;
>> - unsigned int tmp;
>> - int i;
>> + unsigned out_num = 0, in_num = 0, tmp;
>>
>> /* Caller should know better */
>> - BUG_ON(!virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ) ||
>> - (out + in > VIRTNET_SEND_COMMAND_SG_MAX));
>> -
>> - out++; /* Add header */
>> - in++; /* Add return status */
>> + BUG_ON(!virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ));
>>
>> - ctrl.class = class;
>> - ctrl.cmd = cmd;
Looks like typos here, those should be kept.
>> + /* Add header */
>> + sg_init_one(&hdr, &ctrl, sizeof(ctrl));
>> + sgs[out_num++] = &hdr;
>>
>> - sg_init_table(sg, out + in);
>> + if (out)
>> + sgs[out_num++] = out;
>> + if (in)
>> + sgs[out_num + in_num++] = in;
>>
>> - sg_set_buf(&sg[0], &ctrl, sizeof(ctrl));
>> - for_each_sg(data, s, out + in - 2, i)
>> - sg_set_buf(&sg[i + 1], sg_virt(s), s->length);
>> - sg_set_buf(&sg[out + in - 1], &status, sizeof(status));
>> + /* Add return status. */
>> + sg_init_one(&stat, &status, sizeof(status));
>> + sgs[out_num + in_num++] = &hdr;
>>
>> - BUG_ON(virtqueue_add_buf(vi->cvq, sg, out, in, vi, GFP_ATOMIC) < 0);
>> + BUG_ON(virtqueue_add_sgs(vi->cvq, sgs, out_num, in_num, vi, GFP_ATOMIC)
>> + < 0);
>>
>> virtqueue_kick(vi->cvq);
>>
>> @@ -874,8 +873,7 @@ static void virtnet_ack_link_announce(struct virtnet_info *vi)
>> {
>> rtnl_lock();
>> if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_ANNOUNCE,
>> - VIRTIO_NET_CTRL_ANNOUNCE_ACK, NULL,
>> - 0, 0))
>> + VIRTIO_NET_CTRL_ANNOUNCE_ACK, NULL, NULL))
>> dev_warn(&vi->dev->dev, "Failed to ack link announce.\n");
>> rtnl_unlock();
>> }
>> @@ -893,7 +891,7 @@ static int virtnet_set_queues(struct virtnet_info *vi, u16 queue_pairs)
>> sg_init_one(&sg, &s, sizeof(s));
>>
>> if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MQ,
>> - VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET, &sg, 1, 0)){
>> + VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET, &sg, NULL)) {
>> dev_warn(&dev->dev, "Fail to set num of queue pairs to %d\n",
>> queue_pairs);
>> return -EINVAL;
>> @@ -940,7 +938,7 @@ static void virtnet_set_rx_mode(struct net_device *dev)
>>
>> if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_RX,
>> VIRTIO_NET_CTRL_RX_PROMISC,
>> - sg, 1, 0))
>> + sg, NULL))
>> dev_warn(&dev->dev, "Failed to %sable promisc mode.\n",
>> promisc ? "en" : "dis");
>>
>> @@ -948,7 +946,7 @@ static void virtnet_set_rx_mode(struct net_device *dev)
>>
>> if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_RX,
>> VIRTIO_NET_CTRL_RX_ALLMULTI,
>> - sg, 1, 0))
>> + sg, NULL))
>> dev_warn(&dev->dev, "Failed to %sable allmulti mode.\n",
>> allmulti ? "en" : "dis");
>>
>> @@ -987,7 +985,7 @@ static void virtnet_set_rx_mode(struct net_device *dev)
>>
>> if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MAC,
>> VIRTIO_NET_CTRL_MAC_TABLE_SET,
>> - sg, 2, 0))
>> + sg, NULL))
>> dev_warn(&dev->dev, "Failed to set MAC fitler table.\n");
>
> After applied this patch, I got the warning messages:
>
> [ 7.545454] net eth0: Failed to disable promisc mode.
> [ 7.546243] net eth0: Failed to disable allmulti mode.
> [ 7.546990] net eth0: Failed to set MAC fitler table.
> [ 7.547940] net eth0: Failed to disable promisc mode.
> [ 7.548840] net eth0: Failed to disable allmulti mode.
> [ 7.549744] net eth0: Failed to set MAC fitler table.
> [ 7.550705] net eth0: Failed to disable promisc mode.
> [ 7.551603] net eth0: Failed to disable allmulti mode.
> [ 7.552504] net eth0: Failed to set MAC fitler table.
> [ 7.553423] net eth0: Failed to disable promisc mode.
> [ 7.554308] net eth0: Failed to disable allmulti mode.
> [ 7.555201] net eth0: Failed to set MAC fitler table.
> [ 9.571103] net eth0: Failed to disable promisc mode.
> [ 9.572948] net eth0: Failed to disable allmulti mode.
> [ 9.574598] net eth0: Failed to set MAC fitler table.
> network[476]: Bringing up interface eth0: [ OK ]
> [ 9.905455] net eth0: Failed to disable promisc mode.
> [ 9.906465] net eth0: Failed to disable allmulti mode.
> [ 9.907234] net eth0: Failed to set MAC fitler table.
>
>
> Any thoughts?
>
>
> Thanks,
> Wanlong Gao
>
>>
>> kfree(buf);
>> @@ -1001,7 +999,7 @@ static int virtnet_vlan_rx_add_vid(struct net_device *dev, u16 vid)
>> sg_init_one(&sg, &vid, sizeof(vid));
>>
>> if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_VLAN,
>> - VIRTIO_NET_CTRL_VLAN_ADD, &sg, 1, 0))
>> + VIRTIO_NET_CTRL_VLAN_ADD, &sg, NULL))
>> dev_warn(&dev->dev, "Failed to add VLAN ID %d.\n", vid);
>> return 0;
>> }
>> @@ -1014,7 +1012,7 @@ static int virtnet_vlan_rx_kill_vid(struct net_device *dev, u16 vid)
>> sg_init_one(&sg, &vid, sizeof(vid));
>>
>> if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_VLAN,
>> - VIRTIO_NET_CTRL_VLAN_DEL, &sg, 1, 0))
>> + VIRTIO_NET_CTRL_VLAN_DEL, &sg, NULL))
>> dev_warn(&dev->dev, "Failed to kill VLAN ID %d.\n", vid);
>> return 0;
>> }
>>
> --
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