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hw/net/spapr_llan: Extract rx buffer code into separate functions

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Refactor the code a little bit by extracting the code that reads
and writes the receive buffer list page into separate functions.
There should be no functional change in this patch, this is just
a preparation for the upcoming extensions that introduce receive
buffer pools.

Signed-off-by: Thomas Huth <thuth@redhat.com>
Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
Reviewed-by: Laurent Vivier <lvivier@redhat.com>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
This commit is contained in:
Thomas Huth 2016-03-21 17:25:22 +01:00 committed by David Gibson
parent 9c1cf38d28
commit d6f39fdfcd
1 changed files with 70 additions and 36 deletions
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106
hw/net/spapr_llan.c
View file

@ -103,6 +103,42 @@ static int spapr_vlan_can_receive(NetClientState *nc)
return (dev->isopen && dev->rx_bufs > 0);
}
/**
* Get buffer descriptor from the receive buffer list page that has been
* supplied by the guest with the H_REGISTER_LOGICAL_LAN call
*/
static vlan_bd_t spapr_vlan_get_rx_bd_from_page(VIOsPAPRVLANDevice *dev,
size_t size)
{
int buf_ptr = dev->use_buf_ptr;
vlan_bd_t bd;
do {
buf_ptr += 8;
if (buf_ptr >= VLAN_RX_BDS_LEN + VLAN_RX_BDS_OFF) {
buf_ptr = VLAN_RX_BDS_OFF;
}
bd = vio_ldq(&dev->sdev, dev->buf_list + buf_ptr);
DPRINTF("use_buf_ptr=%d bd=0x%016llx\n",
buf_ptr, (unsigned long long)bd);
} while ((!(bd & VLAN_BD_VALID) || VLAN_BD_LEN(bd) < size + 8)
&& buf_ptr != dev->use_buf_ptr);
if (!(bd & VLAN_BD_VALID) || VLAN_BD_LEN(bd) < size + 8) {
/* Failed to find a suitable buffer */
return 0;
}
/* Remove the buffer from the pool */
dev->use_buf_ptr = buf_ptr;
vio_stq(&dev->sdev, dev->buf_list + dev->use_buf_ptr, 0);
DPRINTF("Found buffer: ptr=%d rxbufs=%d\n", dev->use_buf_ptr, dev->rx_bufs);
return bd;
}
static ssize_t spapr_vlan_receive(NetClientState *nc, const uint8_t *buf,
size_t size)
{
@ -110,7 +146,6 @@ static ssize_t spapr_vlan_receive(NetClientState *nc, const uint8_t *buf,
VIOsPAPRDevice *sdev = VIO_SPAPR_DEVICE(dev);
vlan_bd_t rxq_bd = vio_ldq(sdev, dev->buf_list + VLAN_RXQ_BD_OFF);
vlan_bd_t bd;
int buf_ptr = dev->use_buf_ptr;
uint64_t handle;
uint8_t control;
@ -125,29 +160,12 @@ static ssize_t spapr_vlan_receive(NetClientState *nc, const uint8_t *buf,
return -1;
}
do {
buf_ptr += 8;
if (buf_ptr >= (VLAN_RX_BDS_LEN + VLAN_RX_BDS_OFF)) {
buf_ptr = VLAN_RX_BDS_OFF;
}
bd = vio_ldq(sdev, dev->buf_list + buf_ptr);
DPRINTF("use_buf_ptr=%d bd=0x%016llx\n",
buf_ptr, (unsigned long long)bd);
} while ((!(bd & VLAN_BD_VALID) || (VLAN_BD_LEN(bd) < (size + 8)))
&& (buf_ptr != dev->use_buf_ptr));
if (!(bd & VLAN_BD_VALID) || (VLAN_BD_LEN(bd) < (size + 8))) {
/* Failed to find a suitable buffer */
bd = spapr_vlan_get_rx_bd_from_page(dev, size);
if (!bd) {
return -1;
}
/* Remove the buffer from the pool */
dev->rx_bufs--;
dev->use_buf_ptr = buf_ptr;
vio_stq(sdev, dev->buf_list + dev->use_buf_ptr, 0);
DPRINTF("Found buffer: ptr=%d num=%d\n", dev->use_buf_ptr, dev->rx_bufs);
/* Transfer the packet data */
if (spapr_vio_dma_write(sdev, VLAN_BD_ADDR(bd) + 8, buf, size) < 0) {
@ -372,6 +390,32 @@ static target_ulong h_free_logical_lan(PowerPCCPU *cpu,
return H_SUCCESS;
}
static target_long spapr_vlan_add_rxbuf_to_page(VIOsPAPRVLANDevice *dev,
target_ulong buf)
{
vlan_bd_t bd;
if (dev->rx_bufs >= VLAN_MAX_BUFS) {
return H_RESOURCE;
}
do {
dev->add_buf_ptr += 8;
if (dev->add_buf_ptr >= VLAN_RX_BDS_LEN + VLAN_RX_BDS_OFF) {
dev->add_buf_ptr = VLAN_RX_BDS_OFF;
}
bd = vio_ldq(&dev->sdev, dev->buf_list + dev->add_buf_ptr);
} while (bd & VLAN_BD_VALID);
vio_stq(&dev->sdev, dev->buf_list + dev->add_buf_ptr, buf);
DPRINTF("h_add_llan_buf(): Added buf ptr=%d rx_bufs=%d bd=0x%016llx\n",
dev->add_buf_ptr, dev->rx_bufs, (unsigned long long)buf);
return 0;
}
static target_ulong h_add_logical_lan_buffer(PowerPCCPU *cpu,
sPAPRMachineState *spapr,
target_ulong opcode,
@ -381,7 +425,7 @@ static target_ulong h_add_logical_lan_buffer(PowerPCCPU *cpu,
target_ulong buf = args[1];
VIOsPAPRDevice *sdev = spapr_vio_find_by_reg(spapr->vio_bus, reg);
VIOsPAPRVLANDevice *dev = VIO_SPAPR_VLAN_DEVICE(sdev);
vlan_bd_t bd;
target_long ret;
DPRINTF("H_ADD_LOGICAL_LAN_BUFFER(0x" TARGET_FMT_lx
", 0x" TARGET_FMT_lx ")\n", reg, buf);
@ -397,29 +441,19 @@ static target_ulong h_add_logical_lan_buffer(PowerPCCPU *cpu,
return H_PARAMETER;
}
if (!dev->isopen || dev->rx_bufs >= VLAN_MAX_BUFS) {
if (!dev->isopen) {
return H_RESOURCE;
}
do {
dev->add_buf_ptr += 8;
if (dev->add_buf_ptr >= (VLAN_RX_BDS_LEN + VLAN_RX_BDS_OFF)) {
dev->add_buf_ptr = VLAN_RX_BDS_OFF;
}
bd = vio_ldq(sdev, dev->buf_list + dev->add_buf_ptr);
} while (bd & VLAN_BD_VALID);
vio_stq(sdev, dev->buf_list + dev->add_buf_ptr, buf);
ret = spapr_vlan_add_rxbuf_to_page(dev, buf);
if (ret) {
return ret;
}
dev->rx_bufs++;
qemu_flush_queued_packets(qemu_get_queue(dev->nic));
DPRINTF("h_add_logical_lan_buffer(): Added buf ptr=%d rx_bufs=%d"
" bd=0x%016llx\n", dev->add_buf_ptr, dev->rx_bufs,
(unsigned long long)buf);
return H_SUCCESS;
}