Re: [PATCH v2] net: remove an assert call in eth_get_gso_type

[Philippe Mathieu-Daudé]

On 10/20/20 4:00 PM, P J P wrote:
> From: Prasad J Pandit <pjp@fedoraproject.org>
>
> eth_get_gso_type() routine returns segmentation offload type based on
> L3 protocol type. It calls g_assert_not_reached if L3 protocol is
> unknown, making the following return statement unreachable. Remove the
> g_assert call, as it maybe triggered by a guest user.
>
> Reported-by: Gaoning Pan <pgn@zju.edu.cn>
> Signed-off-by: Prasad J Pandit <pjp@fedoraproject.org>
> ---
>   net/eth.c | 5 ++---
>   1 file changed, 2 insertions(+), 3 deletions(-)
>
> Update v2: add qemu_log()
>    -> https://lists.nongnu.org/archive/html/qemu-devel/2020-10/msg05576.html
>
> diff --git a/net/eth.c b/net/eth.c
> index 0c1d413ee2..fd76e349eb 100644
> --- a/net/eth.c
> +++ b/net/eth.c
> @@ -16,6 +16,7 @@
>    */
>
>   #include "qemu/osdep.h"
> +#include "qemu/log.h"
>   #include "net/eth.h"
>   #include "net/checksum.h"
>   #include "net/tap.h"
> @@ -71,9 +72,7 @@ eth_get_gso_type(uint16_t l3_proto, uint8_t *l3_hdr, uint8_t 
> l4proto)
>               return VIRTIO_NET_HDR_GSO_TCPV6 | ecn_state;
>           }
>       }
> -
> -    /* Unsupported offload */
> -    g_assert_not_reached();
> +    qemu_log("Probably not GSO frame, unknown L3 protocol: %hd\n", l3_proto);

Not sure why you choose decimal, the usual format is "0x%04"PRIx16.
Otherwise:
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>

>       return VIRTIO_NET_HDR_GSO_NONE | ecn_state;
>   }
> --
> 2.26.2