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Message-ID: <CACGkMEtDSDTS_SVvsf7nwMdabGCN85P-r5WpjgZdVDV5PMdc0g@mail.gmail.com>
Date: Fri, 30 Aug 2024 10:31:44 +0800
From: Jason Wang <jasowang@...hat.com>
To: Dragos Tatulea <dtatulea@...dia.com>
Cc: Carlos Bilbao <carlos.bilbao.osdev@...il.com>, mst@...hat.com, bilbao@...edu,
xuanzhuo@...ux.alibaba.com, eperezma@...hat.com, cratiu@...dia.com,
lingshan.zhu@...el.com, virtualization@...ts.linux.dev,
linux-kernel@...r.kernel.org, Carlos Bilbao <cbilbao@...italocean.com>
Subject: Re: [PATCH 2/2] vdpa: Add support to update speed/duplex in vDPA/mlx5_vnet
On Fri, Aug 30, 2024 at 5:08 AM Dragos Tatulea <dtatulea@...dia.com> wrote:
>
> (resending as I accidentally replied only to Carlos)
>
> On 29.08.24 18:16, Carlos Bilbao wrote:
> > From: Carlos Bilbao <cbilbao@...italocean.com>
> >
> > Include support to update the vDPA configuration fields of speed and
> > duplex (as needed by VHOST_VDPA_SET_CONFIG). This includes function
> > mlx5_vdpa_set_config() as well as changes in vdpa.c to fill the initial
> > values to UNKNOWN. Also add a warning message for when
> > mlx5_vdpa_get_config() receives offset and length out of bounds.
> >
> > Signed-off-by: Carlos Bilbao <cbilbao@...italocean.com>
> > ---
> > drivers/vdpa/mlx5/net/mlx5_vnet.c | 34 ++++++++++++++++++++++++++++++-
> > drivers/vdpa/vdpa.c | 27 ++++++++++++++++++++++++
> > include/uapi/linux/vdpa.h | 2 ++
> > 3 files changed, 62 insertions(+), 1 deletion(-)
> >
> > diff --git a/drivers/vdpa/mlx5/net/mlx5_vnet.c b/drivers/vdpa/mlx5/net/mlx5_vnet.c
> > index c47009a8b472..a44bb2072eec 100644
> > --- a/drivers/vdpa/mlx5/net/mlx5_vnet.c
> > +++ b/drivers/vdpa/mlx5/net/mlx5_vnet.c
> > @@ -3221,12 +3221,44 @@ static void mlx5_vdpa_get_config(struct vdpa_device *vdev, unsigned int offset,
> >
> > if (offset + len <= sizeof(struct virtio_net_config))
> > memcpy(buf, (u8 *)&ndev->config + offset, len);
> > + else
> > + mlx5_vdpa_warn(mvdev, "Offset and length out of bounds\n");
> > }
> >
> > static void mlx5_vdpa_set_config(struct vdpa_device *vdev, unsigned int offset, const void *buf,
> > unsigned int len)
> > {
> > - /* not supported */
> > + struct mlx5_vdpa_dev *mvdev = to_mvdev(vdev);
> > + struct mlx5_vdpa_net *ndev = to_mlx5_vdpa_ndev(mvdev);
> > +
> > + if (offset + len > sizeof(struct virtio_net_config)) {
> > + mlx5_vdpa_warn(mvdev, "Offset and length out of bounds\n");
> > + return;
> > + }
> > +
> > + /*
> > + * Note that this will update the speed/duplex configuration fields
> > + * but the hardware support to actually perform this change does
> > + * not exist yet.
> > + */
> > + switch (offset) {
> > + case offsetof(struct virtio_net_config, speed):
> > + if (len == sizeof(((struct virtio_net_config *) 0)->speed))
> > + memcpy(&ndev->config.speed, buf, len);
> > + else
> > + mlx5_vdpa_warn(mvdev, "Invalid length for speed.\n");
> > + break;
> > +
> > + case offsetof(struct virtio_net_config, duplex):
> > + if (len == sizeof(((struct virtio_net_config *)0)->duplex))
> > + memcpy(&ndev->config.duplex, buf, len);
> > + else
> > + mlx5_vdpa_warn(mvdev, "Invalid length for duplex.\n");
> > + break;
> > +
> > + default:
> > + mlx5_vdpa_warn(mvdev, "Configuration field not supported.\n");
> This will trigger noise in dmesg because there is a MAC configuration here.
> > + }
> I would prefer that the .set_config remains a stub TBH. Setting the fields here is
> misleading: the user might deduce that the configuration worked when they read the
> values and see that they were updated.
Yes, and actually, those fields are read-only according to the spec:
"""
The network device has the following device configuration layout. All
of the device configuration fields are read-only for the driver.
"""
Thanks
>
> Thanks,
> dragos
> > }
> >
> > static u32 mlx5_vdpa_get_generation(struct vdpa_device *vdev)
> > diff --git a/drivers/vdpa/vdpa.c b/drivers/vdpa/vdpa.c
> > index 4dbd2e55a288..b920e4405f6d 100644
> > --- a/drivers/vdpa/vdpa.c
> > +++ b/drivers/vdpa/vdpa.c
> > @@ -15,6 +15,7 @@
> > #include <net/genetlink.h>
> > #include <linux/mod_devicetable.h>
> > #include <linux/virtio_ids.h>
> > +#include <uapi/linux/ethtool.h>
> >
> > static LIST_HEAD(mdev_head);
> > /* A global mutex that protects vdpa management device and device level operations. */
> > @@ -919,6 +920,22 @@ static int vdpa_dev_net_status_config_fill(struct sk_buff *msg, u64 features,
> > return nla_put_u16(msg, VDPA_ATTR_DEV_NET_STATUS, val_u16);
> > }
> >
> > +static int vdpa_dev_net_speed_config_fill(struct sk_buff *msg, u64 features,
> > + struct virtio_net_config *config)
> > +{
> > + __le32 speed = cpu_to_le32(SPEED_UNKNOWN);
> > +
> > + return nla_put(msg, VDPA_ATTR_DEV_NET_CFG_SPEED, sizeof(speed), &speed);
> > +}
> > +
> > +static int vdpa_dev_net_duplex_config_fill(struct sk_buff *msg, u64 features,
> > + struct virtio_net_config *config)
> > +{
> > + u8 duplex = DUPLEX_UNKNOWN;
> > +
> > + return nla_put(msg, VDPA_ATTR_DEV_NET_CFG_DUPLEX, sizeof(duplex), &duplex);
> > +}
> > +
> > static int vdpa_dev_net_config_fill(struct vdpa_device *vdev, struct sk_buff *msg)
> > {
> > struct virtio_net_config config = {};
> > @@ -940,6 +957,16 @@ static int vdpa_dev_net_config_fill(struct vdpa_device *vdev, struct sk_buff *ms
> >
> > if (vdpa_dev_net_status_config_fill(msg, features_device, &config))
> > return -EMSGSIZE;
> > + /*
> > + * mlx5_vdpa vDPA devicess currently do not support the
> > + * VIRTIO_NET_F_SPEED_DUPLEX feature, which reports speed and
> > + * duplex; hence these are set to UNKNOWN for now.
> > + */
> > + if (vdpa_dev_net_speed_config_fill(msg, features_device, &config))
> > + return -EMSGSIZE;
> > +
> > + if (vdpa_dev_net_duplex_config_fill(msg, features_device, &config))
> > + return -EMSGSIZE;
> >
> > return vdpa_dev_net_mq_config_fill(msg, features_device, &config);
> > }
> > diff --git a/include/uapi/linux/vdpa.h b/include/uapi/linux/vdpa.h
> > index 842bf1201ac4..1c64ee0dd7b1 100644
> > --- a/include/uapi/linux/vdpa.h
> > +++ b/include/uapi/linux/vdpa.h
> > @@ -43,6 +43,8 @@ enum vdpa_attr {
> > VDPA_ATTR_DEV_NET_STATUS, /* u8 */
> > VDPA_ATTR_DEV_NET_CFG_MAX_VQP, /* u16 */
> > VDPA_ATTR_DEV_NET_CFG_MTU, /* u16 */
> > + VDPA_ATTR_DEV_NET_CFG_SPEED, /* u32 */
> > + VDPA_ATTR_DEV_NET_CFG_DUPLEX, /* u8 */
> >
> > VDPA_ATTR_DEV_NEGOTIATED_FEATURES, /* u64 */
> > VDPA_ATTR_DEV_MGMTDEV_MAX_VQS, /* u32 */
>
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