/**
* Poll for received packets
*
* @v netdev Network device
*/
static void nii_poll_rx ( struct net_device *netdev ) {
struct nii_nic *nii = netdev->priv;
PXE_CPB_RECEIVE cpb;
PXE_DB_RECEIVE db;
unsigned int quota;
int stat;
int rc;
/* Retrieve up to NII_RX_QUOTA packets */
for ( quota = NII_RX_QUOTA ; quota ; quota-- ) {
/* Allocate buffer, if required */
if ( ! nii->rxbuf ) {
nii->rxbuf = alloc_iob ( nii->mtu );
if ( ! nii->rxbuf ) {
/* Leave for next poll */
break;
}
}
/* Construct parameter block */
memset ( &cpb, 0, sizeof ( cpb ) );
cpb.BufferAddr = virt_to_bus ( nii->rxbuf->data );
cpb.BufferLen = iob_tailroom ( nii->rxbuf );
/* Issue command */
if ( ( stat = nii_issue_cpb_db ( nii, PXE_OPCODE_RECEIVE,
&cpb, sizeof ( cpb ),
&db, sizeof ( db ) ) ) < 0 ) {
/* PXE_STATCODE_NO_DATA is just the usual "no packet"
* status indicator; ignore it.
*/
if ( stat == -PXE_STATCODE_NO_DATA )
break;
/* Anything else is an error */
rc = -EIO_STAT ( stat );
DBGC ( nii, "NII %s could not receive: %s\n",
nii->dev.name, strerror ( rc ) );
netdev_rx_err ( netdev, NULL, rc );
break;
}
/* Hand off to network stack */
iob_put ( nii->rxbuf, db.FrameLen );
netdev_rx ( netdev, nii->rxbuf );
nii->rxbuf = NULL;
}
}
/**
* Poll for received packets
*
* @v netdev Network device
*/
static void snpnet_poll_rx ( struct net_device *netdev ) {
struct snp_nic *snp = netdev->priv;
UINTN len;
unsigned int quota;
EFI_STATUS efirc;
int rc;
/* Retrieve up to SNP_RX_QUOTA packets */
for ( quota = SNP_RX_QUOTA ; quota ; quota-- ) {
/* Allocate buffer, if required */
if ( ! snp->rxbuf ) {
snp->rxbuf = alloc_iob ( snp->mtu );
if ( ! snp->rxbuf ) {
/* Leave for next poll */
break;
}
}
/* Receive packet */
len = iob_tailroom ( snp->rxbuf );
if ( ( efirc = snp->snp->Receive ( snp->snp, NULL, &len,
snp->rxbuf->data, NULL,
NULL, NULL ) ) != 0 ) {
/* EFI_NOT_READY is just the usual "no packet"
* status indication; ignore it.
*/
if ( efirc == EFI_NOT_READY )
break;
/* Anything else is an error */
rc = -EEFI ( efirc );
DBGC ( snp, "SNP %s could not receive: %s\n",
netdev->name, strerror ( rc ) );
netdev_rx_err ( netdev, NULL, rc );
break;
}
/* Hand off to network stack */
iob_put ( snp->rxbuf, len );
netdev_rx ( netdev, snp->rxbuf );
snp->rxbuf = NULL;
}
}
/**
* Refill receive descriptor ring
*
* @v netdev Network device
*/
static void netfront_refill_rx ( struct net_device *netdev ) {
struct netfront_nic *netfront = netdev->priv;
struct xen_device *xendev = netfront->xendev;
struct io_buffer *iobuf;
struct netif_rx_request *request;
int notify;
int rc;
/* Do nothing if ring is already full */
if ( netfront_ring_is_full ( &netfront->rx ) )
return;
/* Refill ring */
do {
/* Allocate I/O buffer */
iobuf = alloc_iob ( PAGE_SIZE );
if ( ! iobuf ) {
/* Wait for next refill */
break;
}
/* Add to descriptor ring */
request = RING_GET_REQUEST ( &netfront->rx_fring,
netfront->rx_fring.req_prod_pvt );
if ( ( rc = netfront_push ( netfront, &netfront->rx,
iobuf, &request->id,
&request->gref ) ) != 0 ) {
netdev_rx_err ( netdev, iobuf, rc );
break;
}
DBGC2 ( netfront, "NETFRONT %s RX id %d ref %d is %#08lx+%zx\n",
xendev->key, request->id, request->gref,
virt_to_phys ( iobuf->data ), iob_tailroom ( iobuf ) );
/* Move to next descriptor */
netfront->rx_fring.req_prod_pvt++;
} while ( ! netfront_ring_is_full ( &netfront->rx ) );
/* Push new descriptors and notify backend if applicable */
RING_PUSH_REQUESTS_AND_CHECK_NOTIFY ( &netfront->rx_fring, notify );
if ( notify )
netfront_send_event ( netfront );
}
