diff options
| -rw-r--r-- | hw/net/spapr_llan.c | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/hw/net/spapr_llan.c b/hw/net/spapr_llan.c index 36a9214128..8b2eebd4e3 100644 --- a/hw/net/spapr_llan.c +++ b/hw/net/spapr_llan.c @@ -123,6 +123,21 @@ static int spapr_vlan_can_receive(NetClientState *nc) } /** + * The last 8 bytes of the receive buffer list page (that has been + * supplied by the guest with the H_REGISTER_LOGICAL_LAN call) contain + * a counter for frames that have been dropped because there was no + * suitable receive buffer available. This function is used to increase + * this counter by one. + */ +static void spapr_vlan_record_dropped_rx_frame(VIOsPAPRVLANDevice *dev) +{ + uint64_t cnt; + + cnt = vio_ldq(&dev->sdev, dev->buf_list + 4096 - 8); + vio_stq(&dev->sdev, dev->buf_list + 4096 - 8, cnt + 1); +} + +/** * Get buffer descriptor from one of our receive buffer pools */ static vlan_bd_t spapr_vlan_get_rx_bd_from_pool(VIOsPAPRVLANDevice *dev, @@ -207,6 +222,7 @@ static ssize_t spapr_vlan_receive(NetClientState *nc, const uint8_t *buf, } if (!dev->rx_bufs) { + spapr_vlan_record_dropped_rx_frame(dev); return 0; } @@ -216,6 +232,7 @@ static ssize_t spapr_vlan_receive(NetClientState *nc, const uint8_t *buf, bd = spapr_vlan_get_rx_bd_from_page(dev, size); } if (!bd) { + spapr_vlan_record_dropped_rx_frame(dev); return 0; } |