Merge remote-tracking branch 'remotes/stefanha/tags/net-pull-request' into staging

Pull request

Here are NIC fixes from Fam Zheng that prevent rx hangs (caused by NIC models
where .can_receive() stops rx but qemu_flush_queued_packets() isn't called).

# gpg: Signature made Mon Jul 27 14:51:48 2015 BST using RSA key ID 81AB73C8
# gpg: Good signature from "Stefan Hajnoczi <stefanha@redhat.com>"
# gpg:                 aka "Stefan Hajnoczi <stefanha@gmail.com>"

* remotes/stefanha/tags/net-pull-request:
  axienet: Flush queued packets when rx is done
  dp8393x: Flush packets when link comes up
  stellaris_enet: Flush queued packets when read done
  mipsnet: Flush queued packets when receiving is enabled
  milkymist-minimac2: Flush queued packets when link comes up
  mcf_fec: Drop mcf_fec_can_receive
  etsec: Flush queue when rx buffer is consumed
  etsec: Move etsec_can_receive into etsec_receive
  usbnet: Drop usbnet_can_receive
  eepro100: Drop nic_can_receive
  pcnet: Drop pcnet_can_receive
  xgmac: Drop packets with eth_can_rx is false.
  hw/net: fix mcf_fec driver receiver
  hw/net: add simple phy support to mcf_fec driver
  hw/net: add ANLPAR bit definitions to generic mii
  hw/net: create common collection of MII definitions

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

1 files changed, 11 insertions, 6 deletions

diff --git a/hw/net/fsl_etsec/rings.c b/hw/net/fsl_etsec/rings.c
index d4a494f..68e7b6d 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;
     }
 
     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)
@@ -644,6 +646,9 @@ void etsec_walk_rx_ring(eTSEC *etsec, int ring_nbr)
     } else {
         etsec->rx_buffer_len = 0;
         etsec->rx_buffer     = NULL;
+        if (etsec->need_flush) {
+            qemu_flush_queued_packets(qemu_get_queue(etsec->nic));
+        }
     }
 
     RING_DEBUG("eTSEC End of ring_write: remaining_data:%zu\n", remaining_data);