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Date:   Mon, 13 May 2019 20:46:19 +0800
From:   Jason Wang <jasowang@...hat.com>
To:     Stefano Garzarella <sgarzare@...hat.com>, netdev@...r.kernel.org
Cc:     "David S. Miller" <davem@...emloft.net>,
        "Michael S. Tsirkin" <mst@...hat.com>,
        virtualization@...ts.linux-foundation.org,
        linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
        Stefan Hajnoczi <stefanha@...hat.com>
Subject: Re: [PATCH v2 8/8] vsock/virtio: make the RX buffer size tunable


On 2019/5/13 下午6:05, Jason Wang wrote:
>
> On 2019/5/10 下午8:58, Stefano Garzarella wrote:
>> The RX buffer size determines the memory consumption of the
>> vsock/virtio guest driver, so we make it tunable through
>> a module parameter.
>>
>> The size allowed are between 4 KB and 64 KB in order to be
>> compatible with old host drivers.
>>
>> Suggested-by: Stefan Hajnoczi <stefanha@...hat.com>
>> Signed-off-by: Stefano Garzarella <sgarzare@...hat.com>
>
>
> I don't see much value of doing this through kernel command line. We 
> should deal with them automatically like what virtio-net did. Or even 
> a module parameter is better.
>
> Thanks


Sorry, I misread the patch. But even module parameter is something not 
flexible enough. We should deal with them transparently.

Thanks


>
>
>> ---
>>   include/linux/virtio_vsock.h     |  1 +
>>   net/vmw_vsock/virtio_transport.c | 27 ++++++++++++++++++++++++++-
>>   2 files changed, 27 insertions(+), 1 deletion(-)
>>
>> diff --git a/include/linux/virtio_vsock.h b/include/linux/virtio_vsock.h
>> index 5a9d25be72df..b9f8c3d91f80 100644
>> --- a/include/linux/virtio_vsock.h
>> +++ b/include/linux/virtio_vsock.h
>> @@ -13,6 +13,7 @@
>>   #define VIRTIO_VSOCK_DEFAULT_RX_BUF_SIZE    (1024 * 64)
>>   #define VIRTIO_VSOCK_MAX_BUF_SIZE        0xFFFFFFFFUL
>>   #define VIRTIO_VSOCK_MAX_PKT_BUF_SIZE        (1024 * 64)
>> +#define VIRTIO_VSOCK_MIN_PKT_BUF_SIZE        (1024 * 4)
>>     enum {
>>       VSOCK_VQ_RX     = 0, /* for host to guest data */
>> diff --git a/net/vmw_vsock/virtio_transport.c 
>> b/net/vmw_vsock/virtio_transport.c
>> index af1d2ce12f54..732398b4e28f 100644
>> --- a/net/vmw_vsock/virtio_transport.c
>> +++ b/net/vmw_vsock/virtio_transport.c
>> @@ -66,6 +66,31 @@ struct virtio_vsock {
>>       u32 guest_cid;
>>   };
>>   +static unsigned int rx_buf_size = VIRTIO_VSOCK_DEFAULT_RX_BUF_SIZE;
>> +
>> +static int param_set_rx_buf_size(const char *val, const struct 
>> kernel_param *kp)
>> +{
>> +    unsigned int size;
>> +    int ret;
>> +
>> +    ret = kstrtouint(val, 0, &size);
>> +    if (ret)
>> +        return ret;
>> +
>> +    if (size < VIRTIO_VSOCK_MIN_PKT_BUF_SIZE ||
>> +        size > VIRTIO_VSOCK_MAX_PKT_BUF_SIZE)
>> +        return -EINVAL;
>> +
>> +    return param_set_uint(val, kp);
>> +};
>> +
>> +static const struct kernel_param_ops param_ops_rx_buf_size = {
>> +    .set = param_set_rx_buf_size,
>> +    .get = param_get_uint,
>> +};
>> +
>> +module_param_cb(rx_buf_size, &param_ops_rx_buf_size, &rx_buf_size, 
>> 0644);
>> +
>>   static struct virtio_vsock *virtio_vsock_get(void)
>>   {
>>       return the_virtio_vsock;
>> @@ -261,7 +286,7 @@ virtio_transport_cancel_pkt(struct vsock_sock *vsk)
>>     static void virtio_vsock_rx_fill(struct virtio_vsock *vsock)
>>   {
>> -    int buf_len = VIRTIO_VSOCK_DEFAULT_RX_BUF_SIZE;
>> +    int buf_len = rx_buf_size;
>>       struct virtio_vsock_pkt *pkt;
>>       struct scatterlist hdr, buf, *sgs[2];
>>       struct virtqueue *vq;

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