"Michael S. Tsirkin" <mst@xxxxxxxxxx> writes:
> On Mon, Mar 18, 2013 at 08:04:44PM +1030, Rusty Russell wrote:
>> It's a bit cleaner to hand multiple sgs, rather than one big one.
>>
>> Cc: "Michael S. Tsirkin" <mst@xxxxxxxxxx>
>> Signed-off-by: Rusty Russell <rusty@xxxxxxxxxxxxxxx>
>> ---
>> drivers/net/virtio_net.c | 50 +++++++++++++++++++++++-----------------------
>> 1 file changed, 25 insertions(+), 25 deletions(-)
>>
>> diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
>> index 57ac4b0..f19865a 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 {
>> @@ -767,32 +766,34 @@ static netdev_tx_t start_xmit(struct sk_buff *skb, 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;
>> + /* 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;
>
> Should be &stat?
>
> Also
> BUG_ON(out_num + in_num > ARRAY_SIZE(sgs))
> probably a good idea?
Thanks, did both.
Cheers,
Rusty.
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