/**
* Poll for completed packets
*
* @v netdev Network device
*/
static void snpnet_poll_tx ( struct net_device *netdev ) {
struct snp_nic *snp = netdev->priv;
struct io_buffer *iobuf;
UINT32 irq;
VOID *txbuf;
EFI_STATUS efirc;
int rc;
/* Get status */
if ( ( efirc = snp->snp->GetStatus ( snp->snp, &irq, &txbuf ) ) != 0 ) {
rc = -EEFI ( efirc );
DBGC ( snp, "SNP %s could not get status: %s\n",
netdev->name, strerror ( rc ) );
netdev_rx_err ( netdev, NULL, rc );
return;
}
/* Do nothing unless we have a completion */
if ( ! txbuf )
return;
/* Sanity check */
if ( ! snp->txbuf ) {
DBGC ( snp, "SNP %s reported spurious TX completion\n",
netdev->name );
netdev_tx_err ( netdev, NULL, -EPIPE );
return;
}
/* Complete transmission */
iobuf = snp->txbuf;
snp->txbuf = NULL;
netdev_tx_complete ( netdev, iobuf );
}
/**
* Transmit an ethernet packet.
*
* The packet can be written to the socket and marked as complete immediately.
*/
static int af_packet_nic_transmit ( struct net_device *netdev,
struct io_buffer *iobuf )
{
struct af_packet_nic * nic = netdev->priv;
struct sockaddr_ll socket_address;
const struct ethhdr * eh;
int rc;
memset(&socket_address, 0, sizeof(socket_address));
socket_address.sll_family = LINUX_AF_PACKET;
socket_address.sll_ifindex = nic->ifindex;
socket_address.sll_halen = ETH_ALEN;
eh = iobuf->data;
memcpy(socket_address.sll_addr, eh->h_dest, ETH_ALEN);
rc = linux_sendto(nic->fd, iobuf->data, iobuf->tail - iobuf->data,
0, (struct sockaddr *)&socket_address,
sizeof(socket_address));
DBGC2(nic, "af_packet %p wrote %d bytes\n", nic, rc);
netdev_tx_complete(netdev, iobuf);
return 0;
}
/*
* vxge_xmit_compl
*
* If an interrupt was raised to indicate DMA complete of the Tx packet,
* this function is called. It identifies the last TxD whose buffer was
* freed and frees all skbs whose data have already DMA'ed into the NICs
* internal memory.
*/
enum vxge_hw_status
vxge_xmit_compl(struct __vxge_hw_fifo *fifo_hw,
struct vxge_hw_fifo_txd *txdp, enum vxge_hw_fifo_tcode tcode)
{
struct net_device *netdev;
struct io_buffer *tx_iob = NULL;
vxge_trace();
netdev = fifo_hw->vpathh->hldev->ndev;
tx_iob = (struct io_buffer *)(intptr_t)txdp->host_control;
if (tcode == VXGE_HW_FIFO_T_CODE_OK) {
netdev_tx_complete(netdev, tx_iob);
} else {
netdev_tx_complete_err(netdev, tx_iob, -EINVAL);
vxge_debug(VXGE_ERR, "%s: transmit failed, tcode %d\n",
netdev->name, tcode);
}
memset(txdp, 0, sizeof(struct vxge_hw_fifo_txd));
return VXGE_HW_OK;
}
/**
* Poll for completed packets
*
* @v netdev Network device
*/
static void netfront_poll_tx ( struct net_device *netdev ) {
struct netfront_nic *netfront = netdev->priv;
struct xen_device *xendev = netfront->xendev;
struct netif_tx_response *response;
struct io_buffer *iobuf;
unsigned int status;
int rc;
/* Consume any unconsumed responses */
while ( RING_HAS_UNCONSUMED_RESPONSES ( &netfront->tx_fring ) ) {
/* Get next response */
response = RING_GET_RESPONSE ( &netfront->tx_fring,
netfront->tx_fring.rsp_cons++ );
/* Retrieve from descriptor ring */
iobuf = netfront_pull ( netfront, &netfront->tx, response->id );
status = response->status;
if ( status == NETIF_RSP_OKAY ) {
DBGC2 ( netfront, "NETFRONT %s TX id %d complete\n",
xendev->key, response->id );
netdev_tx_complete ( netdev, iobuf );
} else {
rc = -EIO_NETIF_RSP ( status );
DBGC2 ( netfront, "NETFRONT %s TX id %d error %d: %s\n",
xendev->key, response->id, status,
strerror ( rc ) );
netdev_tx_complete_err ( netdev, iobuf, rc );
}
}
}
static int legacy_transmit ( struct net_device *netdev, struct io_buffer *iobuf ) {
struct nic *nic = netdev->priv;
struct ethhdr *ethhdr;
DBG ( "Transmitting %zd bytes\n", iob_len ( iobuf ) );
iob_pad ( iobuf, ETH_ZLEN );
ethhdr = iobuf->data;
iob_pull ( iobuf, sizeof ( *ethhdr ) );
nic->nic_op->transmit ( nic, ( const char * ) ethhdr->h_dest,
ntohs ( ethhdr->h_protocol ),
iob_len ( iobuf ), iobuf->data );
netdev_tx_complete ( netdev, iobuf );
return 0;
}
/**
* e1000_process_tx_packets - process transmitted packets
*
* @v netdev network interface device structure
**/
static void e1000e_process_tx_packets ( struct net_device *netdev )
{
struct e1000_adapter *adapter = netdev_priv ( netdev );
uint32_t i;
uint32_t tx_status;
struct e1000_tx_desc *tx_curr_desc;
/* Check status of transmitted packets
*/
DBG ( "process_tx_packets: tx_head = %d, tx_tail = %d\n", adapter->tx_head,
adapter->tx_tail );
while ( ( i = adapter->tx_head ) != adapter->tx_tail ) {
tx_curr_desc = ( void * ) ( adapter->tx_base ) +
( i * sizeof ( *adapter->tx_base ) );
tx_status = tx_curr_desc->upper.data;
DBG ( " tx_curr_desc = %#08lx\n", virt_to_bus ( tx_curr_desc ) );
DBG ( " tx_status = %#08x\n", tx_status );
/* if the packet at tx_head is not owned by hardware it is for us */
if ( ! ( tx_status & E1000_TXD_STAT_DD ) )
break;
DBG ( "Sent packet. tx_head: %d tx_tail: %d tx_status: %#08x\n",
adapter->tx_head, adapter->tx_tail, tx_status );
if ( tx_status & ( E1000_TXD_STAT_EC | E1000_TXD_STAT_LC |
E1000_TXD_STAT_TU ) ) {
netdev_tx_complete_err ( netdev, adapter->tx_iobuf[i], -EINVAL );
DBG ( "Error transmitting packet, tx_status: %#08x\n",
tx_status );
} else {
netdev_tx_complete ( netdev, adapter->tx_iobuf[i] );
DBG ( "Success transmitting packet, tx_status: %#08x\n",
tx_status );
}
/* Decrement count of used descriptors, clear this descriptor
*/
adapter->tx_fill_ctr--;
memset ( tx_curr_desc, 0, sizeof ( *tx_curr_desc ) );
adapter->tx_head = ( adapter->tx_head + 1 ) % NUM_TX_DESC;
}
}
/**
* Poll for completed packets
*
* @v netdev Network device
* @v stat Status flags
*/
static void nii_poll_tx ( struct net_device *netdev, unsigned int stat ) {
struct nii_nic *nii = netdev->priv;
struct io_buffer *iobuf;
/* Do nothing unless we have a completion */
if ( stat & PXE_STATFLAGS_GET_STATUS_NO_TXBUFS_WRITTEN )
return;
/* Sanity check */
assert ( nii->txbuf != NULL );
/* Complete transmission */
iobuf = nii->txbuf;
nii->txbuf = NULL;
netdev_tx_complete ( netdev, iobuf );
}
/** Recycles sent TX descriptors and notifies network stack
*
* @v bp Driver state
*/
static void b44_tx_complete(struct b44_private *bp)
{
u32 cur, i;
cur = pending_tx_index(bp);
for (i = bp->tx_dirty; i != cur; i = ring_next(i)) {
/* Free finished frame */
netdev_tx_complete(bp->netdev, bp->tx_iobuf[i]);
bp->tx_iobuf[i] = NULL;
/* Clear TX descriptor */
bp->tx[i].ctrl = 0;
bp->tx[i].addr = 0;
}
bp->tx_dirty = cur;
}
/**
* Transmit packet
*
* @v netdev Network device
* @v iobuf I/O buffer
* @ret rc Return status code
*/
static int undinet_transmit ( struct net_device *netdev,
struct io_buffer *iobuf ) {
struct s_PXENV_UNDI_TRANSMIT undi_transmit;
size_t len = iob_len ( iobuf );
int rc;
/* Technically, we ought to make sure that the previous
* transmission has completed before we re-use the buffer.
* However, many PXE stacks (including at least some Intel PXE
* stacks and Etherboot 5.4) fail to generate TX completions.
* In practice this won't be a problem, since our TX datapath
* has a very low packet volume and we can get away with
* assuming that a TX will be complete by the time we want to
* transmit the next packet.
*/
/* Copy packet to UNDI I/O buffer */
if ( len > sizeof ( basemem_packet ) )
len = sizeof ( basemem_packet );
memcpy ( &basemem_packet, iobuf->data, len );
/* Create PXENV_UNDI_TRANSMIT data structure */
memset ( &undi_transmit, 0, sizeof ( undi_transmit ) );
undi_transmit.DestAddr.segment = rm_ds;
undi_transmit.DestAddr.offset = __from_data16 ( &undinet_tbd );
undi_transmit.TBD.segment = rm_ds;
undi_transmit.TBD.offset = __from_data16 ( &undinet_tbd );
/* Create PXENV_UNDI_TBD data structure */
undinet_tbd.ImmedLength = len;
undinet_tbd.Xmit.segment = rm_ds;
undinet_tbd.Xmit.offset = __from_data16 ( basemem_packet );
/* Issue PXE API call */
if ( ( rc = pxeparent_call ( undinet_entry, PXENV_UNDI_TRANSMIT,
&undi_transmit,
sizeof ( undi_transmit ) ) ) != 0 )
goto done;
/* Free I/O buffer */
netdev_tx_complete ( netdev, iobuf );
done:
return rc;
}
/**
* e1000_poll - Poll for received packets
*
* @v netdev Network device
*/
static void
e1000_poll ( struct net_device *netdev )
{
struct e1000_adapter *adapter = netdev_priv( netdev );
struct e1000_hw *hw = &adapter->hw;
uint32_t icr;
uint32_t tx_status;
uint32_t rx_status;
uint32_t rx_len;
uint32_t rx_err;
struct e1000_tx_desc *tx_curr_desc;
struct e1000_rx_desc *rx_curr_desc;
uint32_t i;
DBGP ( "e1000_poll\n" );
/* Acknowledge interrupts */
icr = E1000_READ_REG ( hw, ICR );
if ( ! icr )
return;
DBG ( "e1000_poll: intr_status = %#08x\n", icr );
/* Check status of transmitted packets
*/
while ( ( i = adapter->tx_head ) != adapter->tx_tail ) {
tx_curr_desc = ( void * ) ( adapter->tx_base ) +
( i * sizeof ( *adapter->tx_base ) );
tx_status = tx_curr_desc->upper.data;
/* if the packet at tx_head is not owned by hardware it is for us */
if ( ! ( tx_status & E1000_TXD_STAT_DD ) )
break;
DBG ( "Sent packet. tx_head: %d tx_tail: %d tx_status: %#08x\n",
adapter->tx_head, adapter->tx_tail, tx_status );
if ( tx_status & ( E1000_TXD_STAT_EC | E1000_TXD_STAT_LC |
E1000_TXD_STAT_TU ) ) {
netdev_tx_complete_err ( netdev, adapter->tx_iobuf[i], -EINVAL );
DBG ( "Error transmitting packet, tx_status: %#08x\n",
tx_status );
} else {
netdev_tx_complete ( netdev, adapter->tx_iobuf[i] );
DBG ( "Success transmitting packet, tx_status: %#08x\n",
tx_status );
}
/* Decrement count of used descriptors, clear this descriptor
*/
adapter->tx_fill_ctr--;
memset ( tx_curr_desc, 0, sizeof ( *tx_curr_desc ) );
adapter->tx_head = ( adapter->tx_head + 1 ) % NUM_TX_DESC;
}
/* Process received packets
*/
while ( 1 ) {
i = adapter->rx_curr;
rx_curr_desc = ( void * ) ( adapter->rx_base ) +
( i * sizeof ( *adapter->rx_base ) );
rx_status = rx_curr_desc->status;
DBG2 ( "Before DD Check RX_status: %#08x\n", rx_status );
if ( ! ( rx_status & E1000_RXD_STAT_DD ) )
break;
if ( adapter->rx_iobuf[i] == NULL )
break;
DBG ( "RCTL = %#08x\n", E1000_READ_REG ( &adapter->hw, RCTL ) );
rx_len = rx_curr_desc->length;
DBG ( "Received packet, rx_curr: %d rx_status: %#08x rx_len: %d\n",
i, rx_status, rx_len );
rx_err = rx_curr_desc->errors;
iob_put ( adapter->rx_iobuf[i], rx_len );
if ( rx_err & E1000_RXD_ERR_FRAME_ERR_MASK ) {
netdev_rx_err ( netdev, adapter->rx_iobuf[i], -EINVAL );
DBG ( "e1000_poll: Corrupted packet received!"
" rx_err: %#08x\n", rx_err );
} else {
/* Add this packet to the receive queue. */
netdev_rx ( netdev, adapter->rx_iobuf[i] );
}
adapter->rx_iobuf[i] = NULL;
memset ( rx_curr_desc, 0, sizeof ( *rx_curr_desc ) );
adapter->rx_curr = ( adapter->rx_curr + 1 ) % NUM_RX_DESC;
}
e1000_refill_rx_ring(adapter);
}