linux-kernel - Re: [PATCH 3/6] vdpa: validate provisioned device features against specified attribute

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Date:   Tue, 31 Jan 2023 14:17:59 +0200
From:   Eli Cohen <elic@...dia.com>
To:     Si-Wei Liu <si-wei.liu@...cle.com>, mst@...hat.com,
        jasowang@...hat.com, parav@...dia.com
Cc:     virtualization@...ts.linux-foundation.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/6] vdpa: validate provisioned device features against
 specified attribute


On 30/01/2023 22:30, Si-Wei Liu wrote:
> With device feature provisioning, there's a chance for misconfiguration
> that the vdpa feature attribute supplied in 'vdpa dev add' command doesn't
> get selected on the device_features to be provisioned. For instance, when
> a @mac attribute is specified, the corresponding feature bit _F_MAC in
> device_features should be set for consistency. If there's conflict on
> provisioned features against the attribute, it should be treated as an
> error to fail the ambiguous command. Noted the opposite is not
> necessarily true, for e.g. it's okay to have _F_MAC set in device_features
> without providing a corresponding @mac attribute, in which case the vdpa
> vendor driver could load certain default value for attribute that is not
> explicitly specified.
>
> Generalize this check in vdpa core so that there's no duplicate code in
> each vendor driver.
>
> Signed-off-by: Si-Wei Liu <si-wei.liu@...cle.com>
Reviewed-by: Eli Cohen <elic@...dia.com>
> ---
>   drivers/vdpa/vdpa.c | 18 ++++++++++++++++++
>   1 file changed, 18 insertions(+)
>
> diff --git a/drivers/vdpa/vdpa.c b/drivers/vdpa/vdpa.c
> index 5f4883b..6d02b8c 100644
> --- a/drivers/vdpa/vdpa.c
> +++ b/drivers/vdpa/vdpa.c
> @@ -601,8 +601,26 @@ static int vdpa_nl_cmd_dev_add_set_doit(struct sk_buff *skb, struct genl_info *i
>   		config.mask |= BIT_ULL(VDPA_ATTR_DEV_NET_CFG_MAX_VQP);
>   	}
>   	if (nl_attrs[VDPA_ATTR_DEV_FEATURES]) {
> +		u64 missing = 0x0ULL;
> +
>   		config.device_features =
>   			nla_get_u64(nl_attrs[VDPA_ATTR_DEV_FEATURES]);
> +		if (nl_attrs[VDPA_ATTR_DEV_NET_CFG_MACADDR] &&
> +		    !(config.device_features & BIT_ULL(VIRTIO_NET_F_MAC)))
> +			missing |= BIT_ULL(VIRTIO_NET_F_MAC);
> +		if (nl_attrs[VDPA_ATTR_DEV_NET_CFG_MTU] &&
> +		    !(config.device_features & BIT_ULL(VIRTIO_NET_F_MTU)))
> +			missing |= BIT_ULL(VIRTIO_NET_F_MTU);
> +		if (nl_attrs[VDPA_ATTR_DEV_NET_CFG_MAX_VQP] &&
> +		    config.net.max_vq_pairs > 1 &&
> +		    !(config.device_features & BIT_ULL(VIRTIO_NET_F_MQ)))
> +			missing |= BIT_ULL(VIRTIO_NET_F_MQ);
> +		if (missing) {
> +			NL_SET_ERR_MSG_FMT_MOD(info->extack,
> +					       "Missing features 0x%llx for provided attributes",
> +					       missing);
> +			return -EINVAL;
> +		}
>   		config.mask |= BIT_ULL(VDPA_ATTR_DEV_FEATURES);
>   	}
>