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xen: Drop net_rx_ok 

Let net_rx_packet() (which checks the same conditions) drops the packet
if the device is not ready. Drop net_xen_info.can_receive and update the
return value for the buffer full case.

We rely on the qemu_flush_queued_packets() in net_event() to wake up
the peer when the buffer becomes available again.

Signed-off-by: Fam Zheng <famz@redhat.com>
Message-id: 1438077176-378-1-git-send-email-famz@redhat.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
This commit is contained in:
Fam Zheng 2015-07-28 17:52:56 +08:00 committed by Stefan Hajnoczi
parent ff1d2ac949
commit 7bba83bf80
1 changed files with 1 additions and 24 deletions
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25
hw/net/xen_nic.c
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@ -234,27 +234,6 @@ static void net_rx_response(struct XenNetDev *netdev,
#define NET_IP_ALIGN 2 #define NET_IP_ALIGN 2
static int net_rx_ok(NetClientState *nc)
{
struct XenNetDev *netdev = qemu_get_nic_opaque(nc);
RING_IDX rc, rp;
if (netdev->xendev.be_state != XenbusStateConnected) {
return 0;
}
rc = netdev->rx_ring.req_cons;
rp = netdev->rx_ring.sring->req_prod;
xen_rmb();
if (rc == rp || RING_REQUEST_CONS_OVERFLOW(&netdev->rx_ring, rc)) {
xen_be_printf(&netdev->xendev, 2, "%s: no rx buffers (%d/%d)\n",
__FUNCTION__, rc, rp);
return 0;
}
return 1;
}
static ssize_t net_rx_packet(NetClientState *nc, const uint8_t *buf, size_t size) static ssize_t net_rx_packet(NetClientState *nc, const uint8_t *buf, size_t size)
{ {
struct XenNetDev *netdev = qemu_get_nic_opaque(nc); struct XenNetDev *netdev = qemu_get_nic_opaque(nc);
@ -271,8 +250,7 @@ static ssize_t net_rx_packet(NetClientState *nc, const uint8_t *buf, size_t size
xen_rmb(); /* Ensure we see queued requests up to 'rp'. */ xen_rmb(); /* Ensure we see queued requests up to 'rp'. */
if (rc == rp || RING_REQUEST_CONS_OVERFLOW(&netdev->rx_ring, rc)) { if (rc == rp || RING_REQUEST_CONS_OVERFLOW(&netdev->rx_ring, rc)) {
xen_be_printf(&netdev->xendev, 2, "no buffer, drop packet\n"); return 0;
return -1;
} }
if (size > XC_PAGE_SIZE - NET_IP_ALIGN) { if (size > XC_PAGE_SIZE - NET_IP_ALIGN) {
xen_be_printf(&netdev->xendev, 0, "packet too big (%lu > %ld)", xen_be_printf(&netdev->xendev, 0, "packet too big (%lu > %ld)",
@ -304,7 +282,6 @@ static ssize_t net_rx_packet(NetClientState *nc, const uint8_t *buf, size_t size
static NetClientInfo net_xen_info = { static NetClientInfo net_xen_info = {
.type = NET_CLIENT_OPTIONS_KIND_NIC, .type = NET_CLIENT_OPTIONS_KIND_NIC,
.size = sizeof(NICState), .size = sizeof(NICState),
.can_receive = net_rx_ok,
.receive = net_rx_packet, .receive = net_rx_packet,
}; };