Re: [PATCH] vmxnet3: add stub for encapsulation offload

[Philippe Mathieu-Daudé]

On 8/7/21 12:23 AM, Alexander Bulekov wrote:
> Encapsulation offload (offload mode 1) is a valid mode present in the
> kernel that isn't implemented in QEMU, yet.
> 
> https://lore.kernel.org/lkml/20200528015426.8285-4-doshir@vmware.com/
> 
> Add a stub for this mode, to avoid the guest-triggerable assertion.
> 
> Resolves: https://gitlab.com/qemu-project/qemu/-/issues/517
> Signed-off-by: Alexander Bulekov <alxndr@bu.edu>
> ---
>  hw/net/vmxnet3.c | 5 +++++
>  hw/net/vmxnet3.h | 1 +
>  2 files changed, 6 insertions(+)
> 
> diff --git a/hw/net/vmxnet3.c b/hw/net/vmxnet3.c
> index 41f796a247..62e11d0e3e 100644
> --- a/hw/net/vmxnet3.c
> +++ b/hw/net/vmxnet3.c
> @@ -443,6 +443,11 @@ vmxnet3_setup_tx_offloads(VMXNET3State *s)
>          net_tx_pkt_build_vheader(s->tx_pkt, false, false, 0);
>          break;
>  
> +    case VMXNET3_OM_ENCAP:
> +        VMW_PKPRN("Encapsulation offload requested, but not available\n");
> +        return false;
> +        break;

No need to break if you returned (unreachable).

> +
>      case VMXNET3_OM_CSUM:
>          net_tx_pkt_build_vheader(s->tx_pkt, false, true, 0);
>          VMW_PKPRN("L4 CSO requested\n");
> diff --git a/hw/net/vmxnet3.h b/hw/net/vmxnet3.h
> index 5b3b76ba7a..36a17b82aa 100644
> --- a/hw/net/vmxnet3.h
> +++ b/hw/net/vmxnet3.h
> @@ -273,6 +273,7 @@ struct Vmxnet3_TxDesc {
>  
>  /* TxDesc.OM values */
>  #define VMXNET3_OM_NONE        0
> +#define VMXNET3_OM_ENCAP       1
>  #define VMXNET3_OM_CSUM        2
>  #define VMXNET3_OM_TSO        3
>  
>