Re: [PATCH net v3] octeontx2-pf: check DMAC extraction support before filtering

[Harshitha Ramamurthy]

On Tue, Jun 30, 2026 at 9:26 AM <nshettyj@xxxxxxxxxxx> wrote:
>
> From: Suman Ghosh <sumang@xxxxxxxxxxx>
>
> Currently, configuring a VF MAC address via the PF (e.g., 'ip link
> set <pf> vf 0 mac <mac>') blindly attempts to install a DMAC-based
> hardware filter. However, the hardware parser profile might not
> support DMAC extraction.
>
> Check if the hardware parsing profile supports DMAC extraction
> before adding the filter. Additionally, emit a warning message
> to inform the operator if the MAC filter installation fails due
> to missing DMAC extraction support.
>
> Fixes: f0c2982aaf98 ("octeontx2-pf: Add support for SR-IOV management functions")
> Signed-off-by: Suman Ghosh <sumang@xxxxxxxxxxx>
> Signed-off-by: Nitin Shetty J <nshettyj@xxxxxxxxxxx>
>
> ---
> v3:
>  - Update config->mac only after hardware programming succeeds in
>    otx2_set_vf_mac().
> v2:
>  - Move the DMAC extraction check from otx2_set_vf_mac() into
>    otx2_do_set_vf_mac() which already holds pf->mbox.lock, so all
>    mbox operations are under a single lock/unlock pair. All error
>    paths now use the existing goto-out pattern, eliminating the
>    scattered mutex_unlock() + return calls from v1.
>  - Return -EOPNOTSUPP instead of 0 when DMAC extraction is not
>    supported, so the caller gets an explicit error rather than a
>    silent success.
> ---
>  .../ethernet/marvell/octeontx2/nic/otx2_pf.c  | 44 ++++++++++++++++---
>  1 file changed, 38 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/net/ethernet/marvell/octeontx2/nic/otx2_pf.c b/drivers/net/ethernet/marvell/octeontx2/nic/otx2_pf.c
> index b63df5737ff2..697570765957 100644
> --- a/drivers/net/ethernet/marvell/octeontx2/nic/otx2_pf.c
> +++ b/drivers/net/ethernet/marvell/octeontx2/nic/otx2_pf.c
> @@ -2517,10 +2517,43 @@ EXPORT_SYMBOL(otx2_config_hwtstamp_set);
>
>  static int otx2_do_set_vf_mac(struct otx2_nic *pf, int vf, const u8 *mac)
>  {
> +       struct npc_get_field_status_req *freq;
> +       struct npc_get_field_status_rsp *frsp;
>         struct npc_install_flow_req *req;
>         int err;
>
>         mutex_lock(&pf->mbox.lock);
> +
> +       /* Skip installing the DMAC filter if the hardware parser profile
> +        * does not support DMAC extraction.
> +        */
> +       freq = otx2_mbox_alloc_msg_npc_get_field_status(&pf->mbox);
> +       if (!freq) {
> +               err = -ENOMEM;
> +               goto out;
> +       }
> +
> +       freq->field = NPC_DMAC;
> +       if (otx2_sync_mbox_msg(&pf->mbox)) {
> +               err = -EINVAL;
> +               goto out;
> +       }
> +
> +       frsp = (struct npc_get_field_status_rsp *)otx2_mbox_get_rsp
> +              (&pf->mbox.mbox, 0, &freq->hdr);
> +       if (IS_ERR(frsp)) {
> +               err = PTR_ERR(frsp);
> +               goto out;
> +       }
> +
> +       if (!frsp->enable) {
> +               netdev_warn(pf->netdev,
> +                           "VF %d MAC filter not installed: DMAC extraction not supported by parser profile\n",
> +                           vf);
> +               err = -EOPNOTSUPP;
> +               goto out;
> +       }
> +
>         req = otx2_mbox_alloc_msg_npc_install_flow(&pf->mbox);
>         if (!req) {
>                 err = -ENOMEM;
> @@ -2559,13 +2592,12 @@ static int otx2_set_vf_mac(struct net_device *netdev, int vf, u8 *mac)
>         if (!is_valid_ether_addr(mac))
>                 return -EINVAL;
>
> -       config = &pf->vf_configs[vf];
> -       ether_addr_copy(config->mac, mac);
> -
>         ret = otx2_do_set_vf_mac(pf, vf, mac);
> -       if (ret == 0)
> -               dev_info(&pdev->dev,
> -                        "Load/Reload VF driver\n");
> +       if (ret == 0) {
> +               config = &pf->vf_configs[vf];
> +               ether_addr_copy(config->mac, mac);
> +               dev_info(&pdev->dev, "Load/Reload VF driver\n");
> +       }

This is a valid change and would have been nice to mention it in the
commit message. Either way:

Reviewed-by: Harshitha Ramamurthy <hramamurthy@xxxxxxxxxx>

>
>         return ret;
>  }
> --
> 2.48.1
>