Re: [RFC PATCH net-next 4/6] net: ethernet: implement data transaction interface

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> The ethernet frame to be sent to MAC-PHY is converted into multiple
> transmit data chunks. A transmit data chunk consists of a 4-byte data
> header followed by the transmit data chunk payload.
> 
> The received ethernet frame from the network is converted into multiple
> receive data chunks by the MAC-PHY and a receive data chunk consists of
> the receive data chunk payload followed by a 4-byte data footer at the
> end.
> 
> The MAC-PHY shall support a default data chunk payload size of 64 bytes.
> Data chunk payload sizes of 32, 16, or 8 bytes may also be supported. The
> data chunk payload is always a multiple of 4 bytes.
> 
> The 4-byte data header occurs at the beginning of each transmit data
> chunk on MOSI and the 4-byte data footer occurs at the end of each
> receive data chunk on MISO. The data header and footer contain the
> information needed to determine the validity and location of the transmit
> and receive frame data within the data chunk payload. Ethernet frames
> shall be aligned to a 32-bit boundary within the data chunk payload.
> 
> Signed-off-by: Parthiban Veerasooran <Parthiban.Veerasooran@xxxxxxxxxxxxx>
> ---
>  drivers/net/ethernet/oa_tc6.c | 425 +++++++++++++++++++++++++++++++++-
>  include/linux/oa_tc6.h        |  65 +++++-
>  2 files changed, 485 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/net/ethernet/oa_tc6.c b/drivers/net/ethernet/oa_tc6.c
> index 65a7317f768d..20138b178185 100644
> --- a/drivers/net/ethernet/oa_tc6.c
> +++ b/drivers/net/ethernet/oa_tc6.c
> @@ -5,6 +5,7 @@
>   * Author: Parthiban Veerasooran <parthiban.veerasooran@xxxxxxxxxxxxx>
>   */
>  
> +#include <linux/etherdevice.h>
>  #include <linux/bitfield.h>
>  #include <linux/interrupt.h>
>  #include <linux/oa_tc6.h>
> @@ -193,17 +194,224 @@ int oa_tc6_perform_ctrl(struct oa_tc6 *tc6, u32 addr, u32 val[], u8 len,
>  	return ret;
>  }
>  
> +static u16 oa_tc6_prepare_empty_chunk(struct oa_tc6 *tc6, u8 *buf, u8 cp_count)
> +{
> +	u32 hdr;
> +
> +	/* Prepare empty chunks used for getting interrupt information or if
> +	 * receive data available.
> +	 */
> +	for (u8 i = 0; i < cp_count; i++) {
> +		hdr = FIELD_PREP(DATA_HDR_DNC, 1);
> +		hdr |= FIELD_PREP(DATA_HDR_P, oa_tc6_get_parity(hdr));
> +		hdr = cpu_to_be32(hdr);
> +		*(u32 *)&buf[i * (tc6->cps + TC6_HDR_SIZE)] = hdr;
> +		memset(&buf[TC6_HDR_SIZE + (i * (tc6->cps + TC6_HDR_SIZE))], 0,
> +		       tc6->cps);
> +	}
> +
> +	return cp_count * (tc6->cps + TC6_HDR_SIZE);
> +}
> +
> +static void oa_tc6_rx_eth_ready(struct oa_tc6 *tc6)
> +{
> +	struct sk_buff *skb = NULL;
Unnecessary initialization for skb.

> +
> +	/* Send the received ethernet packet to network layer */
> +	skb = netdev_alloc_skb(tc6->netdev, tc6->rxd_bytes + NET_IP_ALIGN);
> +	if (!skb) {
> +		tc6->netdev->stats.rx_dropped++;
> +		netdev_err(tc6->netdev, "Out of memory for rx'd frame");
> +	} else {
> +		skb_reserve(skb, NET_IP_ALIGN);
> +		memcpy(skb_put(skb, tc6->rxd_bytes), &tc6->eth_rx_buf[0],
> +		       tc6->rxd_bytes);
> +		skb->protocol = eth_type_trans(skb, tc6->netdev);
> +		tc6->netdev->stats.rx_packets++;
> +		tc6->netdev->stats.rx_bytes += tc6->rxd_bytes;
> +		netif_rx(skb);
netif_rx() may fail, I think it is good to add check and statistics.

> +	}
> +}
> +
> +static int oa_tc6_process_exst(struct oa_tc6 *tc6)
> +{
> +	u32 regval;
> +	int ret;
> +
> +	ret = oa_tc6_read_register(tc6, OA_TC6_STS0, &regval, 1);
> +	if (ret) {
> +		netdev_err(tc6->netdev, "STS0 register read failed.\n");
> +		return ret;
> +	}
> +	if (regval & TXPE)
> +		netdev_err(tc6->netdev, "Transmit protocol error\n");
> +	if (regval & TXBOE)
> +		netdev_err(tc6->netdev, "Transmit buffer overflow\n");
> +	if (regval & TXBUE)
> +		netdev_err(tc6->netdev, "Transmit buffer underflow\n");
> +	if (regval & RXBOE)
> +		netdev_err(tc6->netdev, "Receive buffer overflow\n");
> +	if (regval & LOFE)
> +		netdev_err(tc6->netdev, "Loss of frame\n");
> +	if (regval & HDRE)
> +		netdev_err(tc6->netdev, "Header error\n");
> +	if (regval & TXFCSE)
> +		netdev_err(tc6->netdev, "Transmit Frame Check Sequence Error\n");
> +	ret = oa_tc6_write_register(tc6, OA_TC6_STS0, &regval, 1);
> +	if (ret)
> +		netdev_err(tc6->netdev, "STS0 register write failed.\n");
> +	return ret;
> +}
> +
> +static int oa_tc6_process_rx_chunks(struct oa_tc6 *tc6, u8 *buf, u16 len)
> +{
> +	u8 cp_count;
> +	u8 *payload;
> +	u32 ftr;
> +	u16 ebo;
> +	u16 sbo;
> +
> +	/* Calculate the number of chunks received */
> +	cp_count = len / (tc6->cps + TC6_FTR_SIZE);
> +
> +	for (u8 i = 0; i < cp_count; i++) {
> +		/* Get the footer and payload */
> +		ftr = *(u32 *)&buf[tc6->cps + (i * (tc6->cps + TC6_FTR_SIZE))];
> +		ftr = be32_to_cpu(ftr);
> +		payload = &buf[(i * (tc6->cps + TC6_FTR_SIZE))];
> +		/* Check for footer parity error */
> +		if (oa_tc6_get_parity(ftr)) {
> +			netdev_err(tc6->netdev, "Footer: Parity error\n");
> +			goto err_exit;
> +		}
> +		/* If EXST set in the footer then read STS0 register to get the
> +		 * status information.
> +		 */
> +		if (FIELD_GET(DATA_FTR_EXST, ftr)) {
> +			if (oa_tc6_process_exst(tc6))
> +				netdev_err(tc6->netdev, "Failed to process EXST\n");
> +			goto err_exit;
> +		}
> +		if (FIELD_GET(DATA_FTR_HDRB, ftr)) {
> +			netdev_err(tc6->netdev, "Footer: Received header bad\n");
> +			goto err_exit;
> +		}
> +		if (!FIELD_GET(DATA_FTR_SYNC, ftr)) {
> +			netdev_err(tc6->netdev, "Footer: Configuration unsync\n");
> +			goto err_exit;
> +		}
> +		/* If Frame Drop is set, indicates that the MAC has detected a
> +		 * condition for which the SPI host should drop the received
> +		 * ethernet frame.
> +		 */
> +		if (FIELD_GET(DATA_FTR_FD, ftr) && FIELD_GET(DATA_FTR_EV, ftr)) {
> +			netdev_warn(tc6->netdev, "Footer: Frame drop\n");
> +			if (FIELD_GET(DATA_FTR_SV, ftr)) {
> +				goto start_new_frame;
> +			} else {
> +				if (tc6->rx_eth_started) {
> +					tc6->rxd_bytes = 0;
> +					tc6->rx_eth_started = false;
> +					tc6->netdev->stats.rx_dropped++;
> +				}
> +				continue;
> +			}
> +		}
> +		/* Check for data valid */
> +		if (FIELD_GET(DATA_FTR_DV, ftr)) {
> +			/* Check whether both start valid and end valid are in a
> +			 * single chunk payload means a single chunk payload may
> +			 * contain an entire ethernet frame.
> +			 */
> +			if (FIELD_GET(DATA_FTR_SV, ftr) &&
> +			    FIELD_GET(DATA_FTR_EV, ftr)) {
> +				sbo = FIELD_GET(DATA_FTR_SWO, ftr) * 4;
> +				ebo = FIELD_GET(DATA_FTR_EBO, ftr) + 1;
> +				if (ebo <= sbo) {
> +					memcpy(&tc6->eth_rx_buf[tc6->rxd_bytes],
> +					       &payload[0], ebo);
> +					tc6->rxd_bytes += ebo;
> +					oa_tc6_rx_eth_ready(tc6);
> +					tc6->rxd_bytes = 0;
> +					memcpy(&tc6->eth_rx_buf[tc6->rxd_bytes],
> +					       &payload[sbo], tc6->cps - sbo);
> +					tc6->rxd_bytes += (tc6->cps - sbo);
> +					goto exit;
> +				} else {
> +					memcpy(&tc6->eth_rx_buf[tc6->rxd_bytes],
> +					       &payload[sbo], ebo - sbo);
> +					tc6->rxd_bytes += (ebo - sbo);
> +					oa_tc6_rx_eth_ready(tc6);
> +					tc6->rxd_bytes = 0;
> +					goto exit;
> +				}
> +			}
> +start_new_frame:
> +			/* Check for start valid to start capturing the incoming
> +			 * ethernet frame.
> +			 */
> +			if (FIELD_GET(DATA_FTR_SV, ftr) && !tc6->rx_eth_started) {
> +				tc6->rxd_bytes = 0;
> +				tc6->rx_eth_started = true;
> +				sbo = FIELD_GET(DATA_FTR_SWO, ftr) * 4;
> +				memcpy(&tc6->eth_rx_buf[tc6->rxd_bytes],
> +				       &payload[sbo], tc6->cps - sbo);
> +				tc6->rxd_bytes += (tc6->cps - sbo);
> +				goto exit;
> +			}
> +
> +			/* Check for end valid and calculate the copy length */
> +			if (tc6->rx_eth_started) {
> +				if (FIELD_GET(DATA_FTR_EV, ftr))
> +					ebo = FIELD_GET(DATA_FTR_EBO, ftr) + 1;
> +				else
> +					ebo = tc6->cps;
> +
> +				memcpy(&tc6->eth_rx_buf[tc6->rxd_bytes],
> +				       &payload[0], ebo);
> +				tc6->rxd_bytes += ebo;
> +				if (FIELD_GET(DATA_FTR_EV, ftr)) {
> +					/* If End Valid set then send the
> +					 * received ethernet frame to n/w.
> +					 */
> +					oa_tc6_rx_eth_ready(tc6);
> +					tc6->rxd_bytes = 0;
> +					tc6->rx_eth_started = false;
> +				}
> +			}
> +		}
> +
> +exit:
> +		tc6->txc = FIELD_GET(DATA_FTR_TXC, ftr);
> +		tc6->rca = FIELD_GET(DATA_FTR_RCA, ftr);
> +	}
> +	return FTR_OK;
> +
> +err_exit:
> +	if (tc6->rx_eth_started) {
> +		tc6->rxd_bytes = 0;
> +		tc6->rx_eth_started = false;
> +		tc6->netdev->stats.rx_dropped++;
> +	}
> +	return FTR_ERR;
> +}
> +
>  static int oa_tc6_handler(void *data)
>  {
>  	struct oa_tc6 *tc6 = data;
> +	bool txc_wait = false;
> +	u16 tx_pos = 0;
>  	u32 regval;
> +	u16 len;
>  	int ret;
>  
>  	while (likely(!kthread_should_stop())) {
> -		wait_event_interruptible(tc6->tc6_wq, tc6->int_flag ||
> +		wait_event_interruptible(tc6->tc6_wq, tc6->tx_flag ||
> +					 tc6->int_flag || tc6->rca ||
>  					 kthread_should_stop());
> -		if (tc6->int_flag) {
> +		if (tc6->int_flag && !tc6->reset) {
>  			tc6->int_flag = false;
> +			tc6->reset = true;
>  			ret = oa_tc6_perform_ctrl(tc6, OA_TC6_STS0, &regval, 1,
>  						  false, false);
>  			if (ret) {
> @@ -227,10 +435,170 @@ static int oa_tc6_handler(void *data)
>  				complete(&tc6->rst_complete);
>  			}
>  		}
> +
> +		if (tc6->int_flag || tc6->rca) {
> +			/* If rca is updated from the previous footer then
> +			 * prepare the empty chunks equal to rca and perform
> +			 * SPI transfer to receive the ethernet frame.
> +			 */
> +			if (tc6->rca) {
> +				len = oa_tc6_prepare_empty_chunk(tc6,
> +								 tc6->spi_tx_buf,
> +								 tc6->rca);
> +			} else {
> +				/* If there is an interrupt then perform a SPI
> +				 * transfer with a empty chunk to get the
> +				 * details.
> +				 */
> +				tc6->int_flag = false;
> +				len = oa_tc6_prepare_empty_chunk(tc6,
> +								 tc6->spi_tx_buf,
> +								 1);
> +			}
> +			/* Perform SPI transfer */
> +			ret = oa_tc6_spi_transfer(tc6->spi, tc6->spi_tx_buf,
> +						  tc6->spi_rx_buf, len);
> +			if (ret) {
> +				netdev_err(tc6->netdev, "SPI transfer failed\n");
> +				continue;
> +			}
> +			/* Process the received chunks to get the ethernet frame
> +			 * or interrupt details.
> +			 */
> +			if (oa_tc6_process_rx_chunks(tc6, tc6->spi_rx_buf, len))
> +				continue;
> +		}
> +
> +		/* If there is a tx ethernet frame available */
> +		if (tc6->tx_flag || txc_wait) {
> +			tc6->tx_flag = false;
> +			txc_wait = false;
> +			len = 0;
> +			if (!tc6->txc) {
> +				/* If there is no txc available to transport the
> +				 * tx ethernet frames then wait for the MAC-PHY
> +				 * interrupt to get the txc availability.
> +				 */
> +				txc_wait = true;
> +				continue;
> +			} else if (tc6->txc >= tc6->txc_needed) {
> +				len = tc6->txc_needed * (tc6->cps + TC6_HDR_SIZE);
> +			} else {
> +				len = tc6->txc * (tc6->cps + TC6_HDR_SIZE);
> +			}
> +			memcpy(&tc6->spi_tx_buf[0], &tc6->eth_tx_buf[tx_pos],
> +			       len);
> +			ret = oa_tc6_spi_transfer(tc6->spi, tc6->spi_tx_buf,
> +						  tc6->spi_rx_buf, len);
> +			if (ret) {
> +				netdev_err(tc6->netdev, "SPI transfer failed\n");
> +				continue;
> +			}
> +			/* Process the received chunks to get the ethernet frame
> +			 * or status.
> +			 */
> +			if (oa_tc6_process_rx_chunks(tc6, tc6->spi_rx_buf,
> +						     len)) {
> +				/* In case of error while processing rx chunks
> +				 * discard the incomplete tx ethernet frame and
> +				 * resend it.
> +				 */
> +				tx_pos = 0;
> +				tc6->txc_needed = tc6->total_txc_needed;
> +			} else {
> +				tx_pos += len;
> +				tc6->txc_needed = tc6->txc_needed -
> +						  (len / (tc6->cps + TC6_HDR_SIZE));
> +				/* If the complete ethernet frame is transmitted
> +				 * then return the skb and update the details to
> +				 * n/w layer.
> +				 */
> +				if (!tc6->txc_needed) {
> +					tc6->netdev->stats.tx_packets++;
> +					tc6->netdev->stats.tx_bytes += tc6->tx_skb->len;
> +					dev_kfree_skb(tc6->tx_skb);
> +					tx_pos = 0;
> +					tc6->tx_skb = NULL;
> +					if (netif_queue_stopped(tc6->netdev))
> +						netif_wake_queue(tc6->netdev);
> +				} else if (tc6->txc) {
> +					/* If txc is available again and updated
> +					 * from the previous footer then perform
> +					 * tx again.
> +					 */
> +					tc6->tx_flag = true;
> +				} else {
> +					/* If there is no txc then wait for the
> +					 * interrupt to indicate txc
> +					 * availability.
> +					 */
> +					txc_wait = true;
> +				}
> +			}
> +		}
>  	}
>  	return 0;
>  }
>  
> +static void oa_tc6_prepare_tx_chunks(struct oa_tc6 *tc6, u8 *buf,
> +				     struct sk_buff *skb)
> +{
> +	bool frame_started = false;
> +	u16 copied_bytes = 0;
> +	u16 copy_len;
> +	u32 hdr;
> +
> +	/* Calculate the number tx credit counts needed to transport the tx
> +	 * ethernet frame.
> +	 */
> +	tc6->txc_needed = (skb->len / tc6->cps) + ((skb->len % tc6->cps) ? 1 : 0);
> +	tc6->total_txc_needed = tc6->txc_needed;
> +
> +	for (u8 i = 0; i < tc6->txc_needed; i++) {
> +		/* Prepare the header for each chunks to be transmitted */
> +		hdr = FIELD_PREP(DATA_HDR_DNC, 1) |
> +		      FIELD_PREP(DATA_HDR_DV, 1);
> +		if (!frame_started) {
> +			hdr |= FIELD_PREP(DATA_HDR_SV, 1) |
> +			       FIELD_PREP(DATA_HDR_SWO, 0);
> +			frame_started = true;
> +		}
> +		if ((tc6->cps + copied_bytes) >= skb->len) {
> +			copy_len = skb->len - copied_bytes;
> +			hdr |= FIELD_PREP(DATA_HDR_EBO, copy_len - 1) |
> +			       FIELD_PREP(DATA_HDR_EV, 1);
> +		} else {
> +			copy_len = tc6->cps;
> +		}
> +		copied_bytes += copy_len;
> +		hdr |= FIELD_PREP(DATA_HDR_P, oa_tc6_get_parity(hdr));
> +		hdr = cpu_to_be32(hdr);
> +		*(u32 *)&buf[i * (tc6->cps + TC6_HDR_SIZE)] = hdr;
> +		/* Copy the ethernet frame in the chunk payload section */
> +		memcpy(&buf[TC6_HDR_SIZE + (i * (tc6->cps + TC6_HDR_SIZE))],
> +		       &skb->data[copied_bytes - copy_len], copy_len);
> +	}
> +}
> +
> +netdev_tx_t oa_tc6_send_eth_pkt(struct oa_tc6 *tc6, struct sk_buff *skb)
> +{
> +	if (tc6->tx_skb) {
> +		netif_stop_queue(tc6->netdev);
> +		return NETDEV_TX_BUSY;
> +	}
> +
> +	tc6->tx_skb = skb;
> +	/* Prepare tx chunks using the tx ethernet frame */
> +	oa_tc6_prepare_tx_chunks(tc6, tc6->eth_tx_buf, skb);
> +
> +	/* Wake tc6 task to perform tx transfer */
> +	tc6->tx_flag = true;
> +	wake_up_interruptible(&tc6->tc6_wq);
> +
> +	return NETDEV_TX_OK;
> +}
> +EXPORT_SYMBOL_GPL(oa_tc6_send_eth_pkt);
> +
>  static irqreturn_t macphy_irq(int irq, void *dev_id)
>  {
>  	struct oa_tc6 *tc6 = dev_id;
> @@ -293,6 +661,14 @@ int oa_tc6_configure(struct oa_tc6 *tc6, u8 cps, bool ctrl_prot, bool tx_cut_thr
>  	u32 regval;
>  	int ret;
>  
> +	/* Read BUFSTS register to get the current txc and rca. */
> +	ret = oa_tc6_read_register(tc6, OA_TC6_BUFSTS, &regval, 1);
> +	if (ret)
> +		return ret;
> +
> +	tc6->txc = FIELD_GET(TXC, regval);
> +	tc6->rca = FIELD_GET(RCA, regval);
> +
>  	/* Read and configure the IMASK0 register for unmasking the interrupts */
>  	ret = oa_tc6_read_register(tc6, OA_TC6_IMASK0, &regval, 1);
>  	if (ret)
> @@ -326,7 +702,7 @@ int oa_tc6_configure(struct oa_tc6 *tc6, u8 cps, bool ctrl_prot, bool tx_cut_thr
>  }
>  EXPORT_SYMBOL_GPL(oa_tc6_configure);
>  
> -struct oa_tc6 *oa_tc6_init(struct spi_device *spi)
> +struct oa_tc6 *oa_tc6_init(struct spi_device *spi, struct net_device *netdev)
>  {
>  	struct oa_tc6 *tc6;
>  	int ret;
> @@ -334,11 +710,39 @@ struct oa_tc6 *oa_tc6_init(struct spi_device *spi)
>  	if (!spi)
>  		return NULL;
>  
> +	if (!netdev)
> +		return NULL;
> +
>  	tc6 = kzalloc(sizeof(*tc6), GFP_KERNEL);
>  	if (!tc6)
>  		return NULL;
>  
>  	tc6->spi = spi;
> +	tc6->netdev = netdev;
> +
> +	/* Allocate memory for the tx buffer used for SPI transfer. */
> +	tc6->spi_tx_buf = kzalloc(MAX_ETH_LEN + (OA_TC6_MAX_CPS * TC6_HDR_SIZE),
> +				  GFP_KERNEL);
> +	if (!tc6->spi_tx_buf)
> +		goto err_spi_tx_buf_alloc;
> +
> +	/* Allocate memory for the rx buffer used for SPI transfer. */
> +	tc6->spi_rx_buf = kzalloc(MAX_ETH_LEN + (OA_TC6_MAX_CPS * TC6_FTR_SIZE),
> +				  GFP_KERNEL);
> +	if (!tc6->spi_rx_buf)
> +		goto err_spi_rx_buf_alloc;
> +
> +	/* Allocate memory for the tx ethernet chunks to transfer on SPI. */
> +	tc6->eth_tx_buf = kzalloc(MAX_ETH_LEN + (OA_TC6_MAX_CPS * TC6_HDR_SIZE),
> +				  GFP_KERNEL);
> +	if (!tc6->eth_tx_buf)
> +		goto err_eth_tx_buf_alloc;
> +
> +	/* Allocate memory for the rx ethernet packet. */
> +	tc6->eth_rx_buf = kzalloc(MAX_ETH_LEN + (OA_TC6_MAX_CPS * TC6_FTR_SIZE),
> +				  GFP_KERNEL);
> +	if (!tc6->eth_rx_buf)
> +		goto err_eth_rx_buf_alloc;
>  
>  	/* Used for triggering the OA TC6 task */
>  	init_waitqueue_head(&tc6->tc6_wq);
> @@ -372,6 +776,14 @@ struct oa_tc6 *oa_tc6_init(struct spi_device *spi)
>  err_macphy_irq:
>  	kthread_stop(tc6->tc6_task);
>  err_tc6_task:
> +	kfree(tc6->eth_rx_buf);
> +err_eth_rx_buf_alloc:
> +	kfree(tc6->eth_tx_buf);
> +err_eth_tx_buf_alloc:
> +	kfree(tc6->spi_rx_buf);
> +err_spi_rx_buf_alloc:
> +	kfree(tc6->spi_tx_buf);
> +err_spi_tx_buf_alloc:
>  	kfree(tc6);
>  	return NULL;
>  }
> @@ -383,8 +795,13 @@ int oa_tc6_deinit(struct oa_tc6 *tc6)
>  
>  	devm_free_irq(&tc6->spi->dev, tc6->spi->irq, tc6);
>  	ret = kthread_stop(tc6->tc6_task);
> -	if (!ret)
> +	if (!ret) {
> +		kfree(tc6->eth_rx_buf);
> +		kfree(tc6->eth_tx_buf);
> +		kfree(tc6->spi_rx_buf);
> +		kfree(tc6->spi_tx_buf);
>  		kfree(tc6);
> +	}
>  	return ret;
>  }
>  EXPORT_SYMBOL_GPL(oa_tc6_deinit);
> diff --git a/include/linux/oa_tc6.h b/include/linux/oa_tc6.h
> index fa29c4e09720..61ac1cdfa7d6 100644
> --- a/include/linux/oa_tc6.h
> +++ b/include/linux/oa_tc6.h
> @@ -6,6 +6,7 @@
>   */
>  
>  #include <linux/spi/spi.h>
> +#include <linux/netdevice.h>
>  
>  /* Control header */
>  #define CTRL_HDR_DNC	BIT(31)		/* Data-Not-Control */
> @@ -17,10 +18,36 @@
>  #define CTRL_HDR_LEN	GENMASK(7, 1)	/* Length */
>  #define CTRL_HDR_P	BIT(0)		/* Parity Bit */
>  
> +/* Data header */
> +#define DATA_HDR_DNC	BIT(31)		/* Data-Not-Control */
> +#define DATA_HDR_SEQ	BIT(30)		/* Data Chunk Sequence */
> +#define DATA_HDR_NORX	BIT(29)		/* No Receive */
> +#define DATA_HDR_DV	BIT(21)		/* Data Valid */
> +#define DATA_HDR_SV	BIT(20)		/* Start Valid */
> +#define DATA_HDR_SWO	GENMASK(19, 16)	/* Start Word Offset */
> +#define DATA_HDR_EV	BIT(14)		/* End Valid */
> +#define DATA_HDR_EBO	GENMASK(13, 8)	/* End Byte Offset */
> +#define DATA_HDR_P	BIT(0)		/* Header Parity Bit */
> +
> +/* Data footer */
> +#define DATA_FTR_EXST	BIT(31)		/* Extended Status */
> +#define DATA_FTR_HDRB	BIT(30)		/* Received Header Bad */
> +#define DATA_FTR_SYNC	BIT(29)		/* Configuration Synchronized */
> +#define DATA_FTR_RCA	GENMASK(28, 24)	/* Receive Chunks Available */
> +#define DATA_FTR_DV	BIT(21)		/* Data Valid */
> +#define DATA_FTR_SV	BIT(20)		/* Start Valid */
> +#define DATA_FTR_SWO	GENMASK(19, 16)	/* Start Word Offset */
> +#define DATA_FTR_FD	BIT(15)		/* Frame Drop */
> +#define DATA_FTR_EV	BIT(14)		/* End Valid */
> +#define DATA_FTR_EBO	GENMASK(13, 8)	/* End Byte Offset */
> +#define DATA_FTR_TXC	GENMASK(5, 1)	/* Transmit Credits */
> +#define DATA_FTR_P	BIT(0)		/* Footer Parity Bit */
> +
>  /* Open Alliance TC6 Standard Control and Status Registers */
>  #define OA_TC6_RESET	0x0003		/* Reset Control and Status Register */
>  #define OA_TC6_CONFIG0	0x0004		/* Configuration Register #0 */
>  #define OA_TC6_STS0	0x0008		/* Status Register #0 */
> +#define OA_TC6_BUFSTS	0x000B          /* Buffer Status Register */
>  #define OA_TC6_IMASK0	0x000C		/* Interrupt Mask Register #0 */
>  
>  /* RESET register field */
> @@ -33,6 +60,17 @@
>  #define PROTE		BIT(5)		/* Ctrl read/write Protection Enable */
>  #define CPS		GENMASK(2, 0)	/* Chunk Payload Size */
>  
> +/* STATUS0 register fields */
> +#define CDPE		BIT(12)		/* Control Data Protection Error */
> +#define TXFCSE		BIT(11)		/* Transmit Frame Check Sequence Error */
> +#define RESETC		BIT(6)		/* Reset Complete */
> +#define HDRE		BIT(5)		/* Header Error */
> +#define LOFE		BIT(4)		/* Loss of Framing Error */
> +#define RXBOE		BIT(3)		/* Receive Buffer Overflow Error */
> +#define TXBUE		BIT(2)		/* Transmit Buffer Underflow Error */
> +#define TXBOE		BIT(1)		/* Transmit Buffer Overflow Error */
> +#define TXPE		BIT(0)		/* Transmit Protocol Error */
> +
>  /* Unmasking interrupt fields in IMASK0 */
>  #define HDREM		~BIT(5)		/* Header Error Mask */
>  #define LOFEM		~BIT(4)		/* Loss of Framing Error Mask */
> @@ -44,24 +82,49 @@
>  /* STATUS0 register field */
>  #define RESETC		BIT(6)		/* Reset Complete */
>  
> +/* BUFSTS register fields */
> +#define TXC		GENMASK(15, 8)	/* Transmit Credits Available */
> +#define RCA		GENMASK(7, 0)	/* Receive Chunks Available */
> +
>  #define TC6_HDR_SIZE	4		/* Ctrl command header size as per OA */
>  #define TC6_FTR_SIZE	4		/* Ctrl command footer size ss per OA */
>  
> +#define FTR_OK		0
> +#define FTR_ERR		1
> +
> +#define MAX_ETH_LEN	1536
> +#define OA_TC6_MAX_CPS	64
> +
>  struct oa_tc6 {
>  	struct completion rst_complete;
>  	struct task_struct *tc6_task;
> +	struct net_device *netdev;
>  	wait_queue_head_t tc6_wq;
>  	struct spi_device *spi;
> +	struct sk_buff *tx_skb;
> +	u8 total_txc_needed;
> +	bool rx_eth_started;
>  	bool tx_cut_thr;
>  	bool rx_cut_thr;
>  	bool ctrl_prot;
> +	u8 *spi_tx_buf;
> +	u8 *spi_rx_buf;
> +	u8 *eth_tx_buf;
> +	u8 *eth_rx_buf;
>  	bool int_flag;
> +	u16 rxd_bytes;
> +	u8 txc_needed;
> +	bool tx_flag;
> +	bool reset;
>  	u8 cps;
> +	u8 txc;
> +	u8 rca;
>  };
>  
> -struct oa_tc6 *oa_tc6_init(struct spi_device *spi);
> +struct oa_tc6 *oa_tc6_init(struct spi_device *spi, struct net_device *netdev);
>  int oa_tc6_deinit(struct oa_tc6 *tc6);
>  int oa_tc6_write_register(struct oa_tc6 *tc6, u32 addr, u32 value[], u8 len);
>  int oa_tc6_read_register(struct oa_tc6 *tc6, u32 addr, u32 value[], u8 len);
>  int oa_tc6_configure(struct oa_tc6 *tc6, u8 cps, bool ctrl_prot, bool tx_cut_thr,
>  		     bool rx_cut_thr);
> +netdev_tx_t oa_tc6_send_eth_pkt(struct oa_tc6 *tc6, struct sk_buff *skb);
> 



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