Re: [Qemu-devel] [PATCH for-2.4 05/12] etsec: Move etsec_can_receive into etsec_receive

[Jason Wang <jasowang@redhat.com>]

On 07/14/2015 03:53 PM, Fam Zheng wrote:
> When etsec_reset returns 0, peer would queue the packet as if
> .can_receive returns false. Drop etsec_can_receive and let etsec_receive
> carry the semantics.
>
> Signed-off-by: Fam Zheng <famz@redhat.com>
> ---
>  hw/net/fsl_etsec/etsec.c | 11 +----------
>  hw/net/fsl_etsec/etsec.h |  2 +-
>  hw/net/fsl_etsec/rings.c | 14 ++++++++------
>  3 files changed, 10 insertions(+), 17 deletions(-)
>
> diff --git a/hw/net/fsl_etsec/etsec.c b/hw/net/fsl_etsec/etsec.c
> index c57365f..f5170ae 100644
> --- a/hw/net/fsl_etsec/etsec.c
> +++ b/hw/net/fsl_etsec/etsec.c
> @@ -338,13 +338,6 @@ static void etsec_reset(DeviceState *d)
>          MII_SR_100X_FD_CAPS     | MII_SR_100T4_CAPS;
>  }
>  
> -static int etsec_can_receive(NetClientState *nc)
> -{
> -    eTSEC *etsec = qemu_get_nic_opaque(nc);
> -
> -    return etsec->rx_buffer_len == 0;
> -}
> -
>  static ssize_t etsec_receive(NetClientState *nc,
>                               const uint8_t  *buf,
>                               size_t          size)
> @@ -355,8 +348,7 @@ static ssize_t etsec_receive(NetClientState *nc,
>      fprintf(stderr, "%s receive size:%d\n", etsec->nic->nc.name, size);
>      qemu_hexdump(buf, stderr, "", size);
>  #endif
> -    etsec_rx_ring_write(etsec, buf, size);
> -    return size;
> +    return etsec_rx_ring_write(etsec, buf, size);
>  }
>  
>  
> @@ -370,7 +362,6 @@ static void etsec_set_link_status(NetClientState *nc)
>  static NetClientInfo net_etsec_info = {
>      .type = NET_CLIENT_OPTIONS_KIND_NIC,
>      .size = sizeof(NICState),
> -    .can_receive = etsec_can_receive,
>      .receive = etsec_receive,
>      .link_status_changed = etsec_set_link_status,
>  };
> diff --git a/hw/net/fsl_etsec/etsec.h b/hw/net/fsl_etsec/etsec.h
> index 78d2c57..fc41773 100644
> --- a/hw/net/fsl_etsec/etsec.h
> +++ b/hw/net/fsl_etsec/etsec.h
> @@ -162,7 +162,7 @@ DeviceState *etsec_create(hwaddr        base,
>  
>  void etsec_walk_tx_ring(eTSEC *etsec, int ring_nbr);
>  void etsec_walk_rx_ring(eTSEC *etsec, int ring_nbr);
> -void etsec_rx_ring_write(eTSEC *etsec, const uint8_t *buf, size_t size);
> +ssize_t etsec_rx_ring_write(eTSEC *etsec, const uint8_t *buf, size_t size);
>  
>  void etsec_write_miim(eTSEC          *etsec,
>                        eTSEC_Register *reg,
> diff --git a/hw/net/fsl_etsec/rings.c b/hw/net/fsl_etsec/rings.c
> index d4a494f..a11280b 100644
> --- a/hw/net/fsl_etsec/rings.c
> +++ b/hw/net/fsl_etsec/rings.c
> @@ -481,40 +481,42 @@ static void rx_init_frame(eTSEC *etsec, const uint8_t *buf, size_t size)
>                 etsec->rx_buffer_len, etsec->rx_padding);
>  }
>  
> -void etsec_rx_ring_write(eTSEC *etsec, const uint8_t *buf, size_t size)
> +ssize_t etsec_rx_ring_write(eTSEC *etsec, const uint8_t *buf, size_t size)
>  {
>      int ring_nbr = 0;           /* Always use ring0 (no filer) */
>  
>      if (etsec->rx_buffer_len != 0) {
>          RING_DEBUG("%s: We can't receive now,"
>                     " a buffer is already in the pipe\n", __func__);
> -        return;
> +        return 0;

Is queue be flushed when rx buffer is available again?

>      }
>  
>      if (etsec->regs[RSTAT].value & 1 << (23 - ring_nbr)) {
>          RING_DEBUG("%s: The ring is halted\n", __func__);
> -        return;
> +        return -1;
>      }
>  
>      if (etsec->regs[DMACTRL].value & DMACTRL_GRS) {
>          RING_DEBUG("%s: Graceful receive stop\n", __func__);
> -        return;
> +        return -1;
>      }
>  
>      if (!(etsec->regs[MACCFG1].value & MACCFG1_RX_EN)) {
>          RING_DEBUG("%s: MAC Receive not enabled\n", __func__);
> -        return;
> +        return -1;
>      }
>  
>      if ((etsec->regs[RCTRL].value & RCTRL_RSF) && (size < 60)) {
>          /* CRC is not in the packet yet, so short frame is below 60 bytes */
>          RING_DEBUG("%s: Drop short frame\n", __func__);
> -        return;
> +        return -1;
>      }
>  
>      rx_init_frame(etsec, buf, size);
>  
>      etsec_walk_rx_ring(etsec, ring_nbr);
> +
> +    return size;
>  }
>  
>  void etsec_walk_rx_ring(eTSEC *etsec, int ring_nbr)