netdev - Re: [External] Re: [RFC v1 6/6] virtio/vsock: add sysfs for rx buf len for dgram

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Date:   Mon, 21 Jun 2021 10:27:40 -0700
From:   "Jiang Wang ." <jiang.wang@...edance.com>
To:     Stefano Garzarella <sgarzare@...hat.com>
Cc:     virtualization@...ts.linux-foundation.org,
        Stefan Hajnoczi <stefanha@...hat.com>,
        "Michael S. Tsirkin" <mst@...hat.com>,
        Arseny Krasnov <arseny.krasnov@...persky.com>,
        cong.wang@...edance.com,
        Xiongchun Duan <duanxiongchun@...edance.com>,
        Yongji Xie <xieyongji@...edance.com>,
        柴稳 <chaiwen.cc@...edance.com>,
        Jason Wang <jasowang@...hat.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Ingo Molnar <mingo@...hat.com>,
        Colin Ian King <colin.king@...onical.com>,
        Norbert Slusarek <nslusarek@....net>,
        Andra Paraschiv <andraprs@...zon.com>,
        Lu Wei <luwei32@...wei.com>,
        Alexander Popov <alex.popov@...ux.com>, kvm@...r.kernel.org,
        Networking <netdev@...r.kernel.org>, linux-kernel@...r.kernel.org
Subject: Re: [External] Re: [RFC v1 6/6] virtio/vsock: add sysfs for rx buf
 len for dgram

On Fri, Jun 18, 2021 at 3:04 AM Stefano Garzarella <sgarzare@...hat.com> wrote:
>
> On Wed, Jun 09, 2021 at 11:24:58PM +0000, Jiang Wang wrote:
> >Make rx buf len configurable via sysfs
> >
> >Signed-off-by: Jiang Wang <jiang.wang@...edance.com>
> >---
> > net/vmw_vsock/virtio_transport.c | 37 +++++++++++++++++++++++++++++++++++--
> > 1 file changed, 35 insertions(+), 2 deletions(-)
> >
> >diff --git a/net/vmw_vsock/virtio_transport.c b/net/vmw_vsock/virtio_transport.c
> >index cf47aadb0c34..2e4dd9c48472 100644
> >--- a/net/vmw_vsock/virtio_transport.c
> >+++ b/net/vmw_vsock/virtio_transport.c
> >@@ -29,6 +29,14 @@ static struct virtio_vsock __rcu *the_virtio_vsock;
> > static struct virtio_vsock *the_virtio_vsock_dgram;
> > static DEFINE_MUTEX(the_virtio_vsock_mutex); /* protects the_virtio_vsock */
> >
> >+static int rx_buf_len = VIRTIO_VSOCK_DEFAULT_RX_BUF_SIZE;
> >+static struct kobject *kobj_ref;
> >+static ssize_t  sysfs_show(struct kobject *kobj,
> >+                      struct kobj_attribute *attr, char *buf);
> >+static ssize_t  sysfs_store(struct kobject *kobj,
> >+                      struct kobj_attribute *attr, const char *buf, size_t count);
> >+static struct kobj_attribute rxbuf_attr = __ATTR(rx_buf_value, 0660, sysfs_show, sysfs_store);
>
> Maybe better to use a 'dgram' prefix.

Sure.

> >+
> > struct virtio_vsock {
> >       struct virtio_device *vdev;
> >       struct virtqueue **vqs;
> >@@ -360,7 +368,7 @@ virtio_transport_cancel_pkt(struct vsock_sock *vsk)
> >
> > static void virtio_vsock_rx_fill(struct virtio_vsock *vsock, bool is_dgram)
> > {
> >-      int buf_len = VIRTIO_VSOCK_DEFAULT_RX_BUF_SIZE;
> >+      int buf_len = rx_buf_len;
> >       struct virtio_vsock_pkt *pkt;
> >       struct scatterlist hdr, buf, *sgs[2];
> >       struct virtqueue *vq;
> >@@ -1003,6 +1011,22 @@ static struct virtio_driver virtio_vsock_driver = {
> >       .remove = virtio_vsock_remove,
> > };
> >
> >+static ssize_t sysfs_show(struct kobject *kobj,
> >+              struct kobj_attribute *attr, char *buf)
> >+{
> >+      return sprintf(buf, "%d", rx_buf_len);
> >+}
> >+
> >+static ssize_t sysfs_store(struct kobject *kobj,
> >+              struct kobj_attribute *attr, const char *buf, size_t count)
> >+{
> >+      if (kstrtou32(buf, 0, &rx_buf_len) < 0)
> >+              return -EINVAL;
> >+      if (rx_buf_len < 1024)
> >+              rx_buf_len = 1024;
> >+      return count;
> >+}
> >+
> > static int __init virtio_vsock_init(void)
> > {
> >       int ret;
> >@@ -1020,8 +1044,17 @@ static int __init virtio_vsock_init(void)
> >       if (ret)
> >               goto out_vci;
> >
> >-      return 0;
> >+      kobj_ref = kobject_create_and_add("vsock", kernel_kobj);
>
> So, IIUC, the path will be /sys/vsock/rx_buf_value?
>
> I'm not sure if we need to add a `virtio` subdir (e.g.
> /sys/vsock/virtio/dgram_rx_buf_size)

I agree adding a virtio is better in case vmware or hyperv will
also have some settings.

> Thanks,
> Stefano
>
> >
> >+      /*Creating sysfs file for etx_value*/
> >+      ret = sysfs_create_file(kobj_ref, &rxbuf_attr.attr);
> >+      if (ret)
> >+              goto out_sysfs;
> >+
> >+      return 0;
> >+out_sysfs:
> >+      kobject_put(kobj_ref);
> >+      sysfs_remove_file(kernel_kobj, &rxbuf_attr.attr);
> > out_vci:
> >       vsock_core_unregister(&virtio_transport.transport);
> > out_wq:
> >--
> >2.11.0
> >
>