netdev - Re: [PATCH virtio 1/4] pds_vdpa: reset to vdpa specified mac

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Message-ID: <CACGkMEthwPRtawkpJMZ5o+H=pOxGszaxOsmKuRH4LkPXrfzRoA@mail.gmail.com>
Date: Fri, 7 Jul 2023 15:33:07 +0800
From: Jason Wang <jasowang@...hat.com>
To: Shannon Nelson <shannon.nelson@....com>
Cc: mst@...hat.com, virtualization@...ts.linux-foundation.org, 
	brett.creeley@....com, netdev@...r.kernel.org, drivers@...sando.io, 
	Allen Hubbe <allen.hubbe@....com>
Subject: Re: [PATCH virtio 1/4] pds_vdpa: reset to vdpa specified mac

On Fri, Jun 30, 2023 at 8:36 AM Shannon Nelson <shannon.nelson@....com> wrote:
>
> From: Allen Hubbe <allen.hubbe@....com>
>
> When the vdpa device is reset, also reinitialize it with the mac address
> that was assigned when the device was added.
>
> Fixes: 151cc834f3dd ("pds_vdpa: add support for vdpa and vdpamgmt interfaces")
> Signed-off-by: Allen Hubbe <allen.hubbe@....com>
> Signed-off-by: Shannon Nelson <shannon.nelson@....com>
> Reviewed-by: Brett Creeley <brett.creeley@....com>
> ---
>  drivers/vdpa/pds/vdpa_dev.c | 16 ++++++++--------
>  drivers/vdpa/pds/vdpa_dev.h |  1 +
>  2 files changed, 9 insertions(+), 8 deletions(-)
>
> diff --git a/drivers/vdpa/pds/vdpa_dev.c b/drivers/vdpa/pds/vdpa_dev.c
> index 5071a4d58f8d..e2e99bb0be2b 100644
> --- a/drivers/vdpa/pds/vdpa_dev.c
> +++ b/drivers/vdpa/pds/vdpa_dev.c
> @@ -409,6 +409,8 @@ static void pds_vdpa_set_status(struct vdpa_device *vdpa_dev, u8 status)
>                         pdsv->vqs[i].avail_idx = 0;
>                         pdsv->vqs[i].used_idx = 0;
>                 }
> +
> +               pds_vdpa_cmd_set_mac(pdsv, pdsv->mac);

So this is not necessarily called during reset. So I think we need to
move it to pds_vdpa_reset()?

The rest looks good.

Thanks

>         }
>
>         if (status & ~old_status & VIRTIO_CONFIG_S_FEATURES_OK) {
> @@ -532,7 +534,6 @@ static int pds_vdpa_dev_add(struct vdpa_mgmt_dev *mdev, const char *name,
>         struct device *dma_dev;
>         struct pci_dev *pdev;
>         struct device *dev;
> -       u8 mac[ETH_ALEN];
>         int err;
>         int i;
>
> @@ -617,19 +618,18 @@ static int pds_vdpa_dev_add(struct vdpa_mgmt_dev *mdev, const char *name,
>          * or set a random mac if default is 00:..:00
>          */
>         if (add_config->mask & BIT_ULL(VDPA_ATTR_DEV_NET_CFG_MACADDR)) {
> -               ether_addr_copy(mac, add_config->net.mac);
> -               pds_vdpa_cmd_set_mac(pdsv, mac);
> +               ether_addr_copy(pdsv->mac, add_config->net.mac);
>         } else {
>                 struct virtio_net_config __iomem *vc;
>
>                 vc = pdsv->vdpa_aux->vd_mdev.device;
> -               memcpy_fromio(mac, vc->mac, sizeof(mac));
> -               if (is_zero_ether_addr(mac)) {
> -                       eth_random_addr(mac);
> -                       dev_info(dev, "setting random mac %pM\n", mac);
> -                       pds_vdpa_cmd_set_mac(pdsv, mac);
> +               memcpy_fromio(pdsv->mac, vc->mac, sizeof(pdsv->mac));
> +               if (is_zero_ether_addr(pdsv->mac)) {
> +                       eth_random_addr(pdsv->mac);
> +                       dev_info(dev, "setting random mac %pM\n", pdsv->mac);
>                 }
>         }
> +       pds_vdpa_cmd_set_mac(pdsv, pdsv->mac);
>
>         for (i = 0; i < pdsv->num_vqs; i++) {
>                 pdsv->vqs[i].qid = i;
> diff --git a/drivers/vdpa/pds/vdpa_dev.h b/drivers/vdpa/pds/vdpa_dev.h
> index a1bc37de9537..cf02df287fc4 100644
> --- a/drivers/vdpa/pds/vdpa_dev.h
> +++ b/drivers/vdpa/pds/vdpa_dev.h
> @@ -39,6 +39,7 @@ struct pds_vdpa_device {
>         u64 req_features;               /* features requested by vdpa */
>         u8 vdpa_index;                  /* rsvd for future subdevice use */
>         u8 num_vqs;                     /* num vqs in use */
> +       u8 mac[ETH_ALEN];               /* mac selected when the device was added */
>         struct vdpa_callback config_cb;
>         struct notifier_block nb;
>  };
> --
> 2.17.1
>