Re: [Qemu-devel] [PATCH 06/14] virtio-net: refactor receive_hdr

[Anthony Liguori <anthony@codemonkey.ws>]

"Michael S. Tsirkin" <mst@redhat.com> writes:

> Now that we know host hdr length, we don't need to
> duplicate the logic in receive_hdr: caller can
> figure out the offset itself.
>
> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

Reviewed-by: Anthony Liguori <aliguori@us.ibm.com>

Regards,

Anthony Liguori

> ---
>  hw/virtio-net.c | 18 +++++++-----------
>  1 file changed, 7 insertions(+), 11 deletions(-)
>
> diff --git a/hw/virtio-net.c b/hw/virtio-net.c
> index 9611d95..3a0d1a7 100644
> --- a/hw/virtio-net.c
> +++ b/hw/virtio-net.c
> @@ -517,15 +517,13 @@ static void work_around_broken_dhclient(const struct virtio_net_hdr *hdr,
>      }
>  }
>  
> -static int receive_header(VirtIONet *n, const struct iovec *iov, int iov_cnt,
> -                          const void *buf, size_t size)
> +static void receive_header(VirtIONet *n, const struct iovec *iov, int iov_cnt,
> +                           const void *buf, size_t size)
>  {
> -    int offset = 0;
> -
>      if (n->has_vnet_hdr) {
> -        work_around_broken_dhclient(buf, buf + offset, size - offset);
> -        offset = sizeof(struct virtio_net_hdr);
> -        iov_from_buf(iov, iov_cnt, 0, buf, offset);
> +        work_around_broken_dhclient(buf, buf + n->host_hdr_len,
> +                                    size - n->host_hdr_len);
> +        iov_from_buf(iov, iov_cnt, 0, buf, sizeof(struct virtio_net_hdr));
>      } else {
>          struct virtio_net_hdr hdr = {
>              .flags = 0,
> @@ -533,8 +531,6 @@ static int receive_header(VirtIONet *n, const struct iovec *iov, int iov_cnt,
>          };
>          iov_from_buf(iov, iov_cnt, 0, &hdr, sizeof hdr);
>      }
> -
> -    return offset;
>  }
>  
>  static int receive_filter(VirtIONet *n, const uint8_t *buf, int size)
> @@ -641,8 +637,8 @@ static ssize_t virtio_net_receive(NetClientState *nc, const uint8_t *buf, size_t
>                                     sizeof(mhdr.num_buffers));
>              }
>  
> -            offset += receive_header(n, sg, elem.in_num,
> -                                     buf + offset, size - offset);
> +            receive_header(n, sg, elem.in_num, buf + offset, size - offset);
> +            offset += n->host_hdr_len;
>              total += n->guest_hdr_len;
>              guest_offset = n->guest_hdr_len;
>          } else {
> -- 
> MST