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| author | Peter Crosthwaite <peter.crosthwaite@xilinx.com> | 2013-04-16 10:27:16 +1000 |
|---|---|---|
| committer | Edgar E. Iglesias <edgar.iglesias@gmail.com> | 2013-04-16 10:04:23 +0200 |
| commit | 35e60bfdbc14ce31bba55cc82144f8a2a82ede68 (patch) | |
| tree | 2e9d9523edd263fc325a819ad6aba7d78edc4c59 /hw/net/xilinx_axienet.c | |
| parent | 210914e29975d17e635f9e8c1f7478c0ed7a208f (diff) | |
| download | qemu-35e60bfdbc14ce31bba55cc82144f8a2a82ede68.tar.gz | |
stream: Add flow control API
Add basic flow control to stream. A stream slave may return short, indicating
that it is not capable of accepting any more data at the present time. Polling
or a callback can be used via the can_push() function to determine when the
slave can receive again.
Signed-off-by: Peter Crosthwaite <peter.crosthwaite@xilinx.com>
Signed-off-by: Edgar E. Iglesias <edgar.iglesias@gmail.com>
Diffstat (limited to 'hw/net/xilinx_axienet.c')
| -rw-r--r-- | hw/net/xilinx_axienet.c | 8 |
1 files changed, 5 insertions, 3 deletions
diff --git a/hw/net/xilinx_axienet.c b/hw/net/xilinx_axienet.c index f4638b2fdf..6d27546b29 100644 --- a/hw/net/xilinx_axienet.c +++ b/hw/net/xilinx_axienet.c @@ -815,7 +815,7 @@ static void eth_cleanup(NetClientState *nc) g_free(s); } -static void +static size_t xilinx_axienet_data_stream_push(StreamSlave *obj, uint8_t *buf, size_t size, uint32_t *hdr) { @@ -824,13 +824,13 @@ xilinx_axienet_data_stream_push(StreamSlave *obj, uint8_t *buf, size_t size, /* TX enable ? */ if (!(s->tc & TC_TX)) { - return; + return size; } /* Jumbo or vlan sizes ? */ if (!(s->tc & TC_JUM)) { if (size > 1518 && size <= 1522 && !(s->tc & TC_VLAN)) { - return; + return size; } } @@ -858,6 +858,8 @@ xilinx_axienet_data_stream_push(StreamSlave *obj, uint8_t *buf, size_t size, s->stats.tx_bytes += size; s->regs[R_IS] |= IS_TX_COMPLETE; enet_update_irq(s); + + return size; } static NetClientInfo net_xilinx_enet_info = { |