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

From: Parthiban.Veerasooran
Date: Tue Sep 12 2023 - 06:34:41 EST

Hi William,

Thank you for reviewing the patch.

On 11/09/23 6:29 pm, Ziyang Xuan (William) wrote:
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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.
Ah yes, will remove it in the next revision.
>
>> +
>> + /* 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.
Sure, will do it in the next revision.

Best Regards,
Parthiban V
>
>> + }
>> +}
>> +
>> +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);
>>