vxge_traffic.c

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/*
 * vxge-traffic.c: iPXE driver for Neterion Inc's X3100 Series 10GbE
 *              PCIe I/O Virtualized Server Adapter.
 *
 * Copyright(c) 2002-2010 Neterion Inc.
 *
 * This software may be used and distributed according to the terms of
 * the GNU General Public License (GPL), incorporated herein by
 * reference.  Drivers based on or derived from this code fall under
 * the GPL and must retain the authorship, copyright and license
 * notice.
 *
 */

FILE_LICENCE(GPL2_ONLY);

#include <ipxe/netdevice.h>
#include <errno.h>

#include "vxge_traffic.h"
#include "vxge_config.h"
#include "vxge_main.h"

/*
 * vxge_hw_vpath_intr_enable - Enable vpath interrupts.
 * @vpath: Virtual Path handle.
 *
 * Enable vpath interrupts. The function is to be executed the last in
 * vpath initialization sequence.
 *
 * See also: vxge_hw_vpath_intr_disable()
 */
enum vxge_hw_status
vxge_hw_vpath_intr_enable(struct __vxge_hw_virtualpath *vpath)
{
        struct vxge_hw_vpath_reg *vp_reg;
        enum vxge_hw_status status = VXGE_HW_OK;

        if (vpath->vp_open == VXGE_HW_VP_NOT_OPEN) {
                status = VXGE_HW_ERR_VPATH_NOT_OPEN;
        goto exit;
        }

        vp_reg = vpath->vp_reg;

        writeq(VXGE_HW_INTR_MASK_ALL, &vp_reg->kdfcctl_errors_reg);

        __vxge_hw_pio_mem_write32_upper((u32)VXGE_HW_INTR_MASK_ALL,
                                &vp_reg->general_errors_reg);

        __vxge_hw_pio_mem_write32_upper((u32)VXGE_HW_INTR_MASK_ALL,
                                &vp_reg->pci_config_errors_reg);

        __vxge_hw_pio_mem_write32_upper((u32)VXGE_HW_INTR_MASK_ALL,
                                &vp_reg->mrpcim_to_vpath_alarm_reg);

        __vxge_hw_pio_mem_write32_upper((u32)VXGE_HW_INTR_MASK_ALL,
                                &vp_reg->srpcim_to_vpath_alarm_reg);

        __vxge_hw_pio_mem_write32_upper((u32)VXGE_HW_INTR_MASK_ALL,
                                &vp_reg->vpath_ppif_int_status);

        __vxge_hw_pio_mem_write32_upper((u32)VXGE_HW_INTR_MASK_ALL,
                                &vp_reg->srpcim_msg_to_vpath_reg);

        __vxge_hw_pio_mem_write32_upper((u32)VXGE_HW_INTR_MASK_ALL,
                                &vp_reg->vpath_pcipif_int_status);

        __vxge_hw_pio_mem_write32_upper((u32)VXGE_HW_INTR_MASK_ALL,
                                &vp_reg->prc_alarm_reg);

        __vxge_hw_pio_mem_write32_upper((u32)VXGE_HW_INTR_MASK_ALL,
                                &vp_reg->wrdma_alarm_status);

        __vxge_hw_pio_mem_write32_upper((u32)VXGE_HW_INTR_MASK_ALL,
                                &vp_reg->asic_ntwk_vp_err_reg);

        __vxge_hw_pio_mem_write32_upper((u32)VXGE_HW_INTR_MASK_ALL,
                                &vp_reg->xgmac_vp_int_status);

        readq(&vp_reg->vpath_general_int_status);

        /* Mask unwanted interrupts */
        __vxge_hw_pio_mem_write32_upper((u32)VXGE_HW_INTR_MASK_ALL,
                                &vp_reg->vpath_pcipif_int_mask);

        __vxge_hw_pio_mem_write32_upper((u32)VXGE_HW_INTR_MASK_ALL,
                                &vp_reg->srpcim_msg_to_vpath_mask);

        __vxge_hw_pio_mem_write32_upper((u32)VXGE_HW_INTR_MASK_ALL,
                                &vp_reg->srpcim_to_vpath_alarm_mask);

        __vxge_hw_pio_mem_write32_upper((u32)VXGE_HW_INTR_MASK_ALL,
                                &vp_reg->mrpcim_to_vpath_alarm_mask);

        __vxge_hw_pio_mem_write32_upper((u32)VXGE_HW_INTR_MASK_ALL,
                                &vp_reg->pci_config_errors_mask);

        /* Unmask the individual interrupts */
        writeq((u32)vxge_bVALn((VXGE_HW_GENERAL_ERRORS_REG_DBLGEN_FIFO1_OVRFLOW|
                VXGE_HW_GENERAL_ERRORS_REG_DBLGEN_FIFO2_OVRFLOW|
                VXGE_HW_GENERAL_ERRORS_REG_STATSB_DROP_TIMEOUT_REQ|
                VXGE_HW_GENERAL_ERRORS_REG_STATSB_PIF_CHAIN_ERR), 0, 32),
                &vp_reg->general_errors_mask);

        __vxge_hw_pio_mem_write32_upper(
                (u32)vxge_bVALn((VXGE_HW_KDFCCTL_ERRORS_REG_KDFCCTL_FIFO1_OVRWR|
                VXGE_HW_KDFCCTL_ERRORS_REG_KDFCCTL_FIFO2_OVRWR|
                VXGE_HW_KDFCCTL_ERRORS_REG_KDFCCTL_FIFO1_POISON|
                VXGE_HW_KDFCCTL_ERRORS_REG_KDFCCTL_FIFO2_POISON|
                VXGE_HW_KDFCCTL_ERRORS_REG_KDFCCTL_FIFO1_DMA_ERR|
                VXGE_HW_KDFCCTL_ERRORS_REG_KDFCCTL_FIFO2_DMA_ERR), 0, 32),
                &vp_reg->kdfcctl_errors_mask);

        __vxge_hw_pio_mem_write32_upper(0, &vp_reg->vpath_ppif_int_mask);

        __vxge_hw_pio_mem_write32_upper(
                (u32)vxge_bVALn(VXGE_HW_PRC_ALARM_REG_PRC_RING_BUMP, 0, 32),
                &vp_reg->prc_alarm_mask);

        __vxge_hw_pio_mem_write32_upper(0, &vp_reg->wrdma_alarm_mask);
        __vxge_hw_pio_mem_write32_upper(0, &vp_reg->xgmac_vp_int_mask);

        if (vpath->hldev->first_vp_id != vpath->vp_id)
                __vxge_hw_pio_mem_write32_upper((u32)VXGE_HW_INTR_MASK_ALL,
                                &vp_reg->asic_ntwk_vp_err_mask);
        else
                __vxge_hw_pio_mem_write32_upper((u32)vxge_bVALn((
                VXGE_HW_ASIC_NTWK_VP_ERR_REG_XMACJ_NTWK_REAFFIRMED_FAULT|
                        VXGE_HW_ASIC_NTWK_VP_ERR_REG_XMACJ_NTWK_REAFFIRMED_OK),
                        0, 32), &vp_reg->asic_ntwk_vp_err_mask);

        __vxge_hw_pio_mem_write32_upper(0, &vp_reg->vpath_general_int_mask);
exit:
        return status;

}

/*
 * vxge_hw_vpath_intr_disable - Disable vpath interrupts.
 * @vpath: Virtual Path handle.
 *
 * Disable vpath interrupts. The function is to be executed the last in
 * vpath initialization sequence.
 *
 * See also: vxge_hw_vpath_intr_enable()
 */
enum vxge_hw_status
vxge_hw_vpath_intr_disable(struct __vxge_hw_virtualpath *vpath)
{
        enum vxge_hw_status status = VXGE_HW_OK;
        struct vxge_hw_vpath_reg __iomem *vp_reg;

        if (vpath->vp_open == VXGE_HW_VP_NOT_OPEN) {
                status = VXGE_HW_ERR_VPATH_NOT_OPEN;
                goto exit;
        }
        vp_reg = vpath->vp_reg;

        __vxge_hw_pio_mem_write32_upper((u32)VXGE_HW_INTR_MASK_ALL,
                        &vp_reg->vpath_general_int_mask);

        writeq(VXGE_HW_INTR_MASK_ALL, &vp_reg->kdfcctl_errors_mask);

        __vxge_hw_pio_mem_write32_upper((u32)VXGE_HW_INTR_MASK_ALL,
                        &vp_reg->general_errors_mask);

        __vxge_hw_pio_mem_write32_upper((u32)VXGE_HW_INTR_MASK_ALL,
                        &vp_reg->pci_config_errors_mask);

        __vxge_hw_pio_mem_write32_upper((u32)VXGE_HW_INTR_MASK_ALL,
                        &vp_reg->mrpcim_to_vpath_alarm_mask);

        __vxge_hw_pio_mem_write32_upper((u32)VXGE_HW_INTR_MASK_ALL,
                        &vp_reg->srpcim_to_vpath_alarm_mask);

        __vxge_hw_pio_mem_write32_upper((u32)VXGE_HW_INTR_MASK_ALL,
                        &vp_reg->vpath_ppif_int_mask);

        __vxge_hw_pio_mem_write32_upper((u32)VXGE_HW_INTR_MASK_ALL,
                        &vp_reg->srpcim_msg_to_vpath_mask);

        __vxge_hw_pio_mem_write32_upper((u32)VXGE_HW_INTR_MASK_ALL,
                        &vp_reg->vpath_pcipif_int_mask);

        __vxge_hw_pio_mem_write32_upper((u32)VXGE_HW_INTR_MASK_ALL,
                        &vp_reg->wrdma_alarm_mask);

        __vxge_hw_pio_mem_write32_upper((u32)VXGE_HW_INTR_MASK_ALL,
                        &vp_reg->prc_alarm_mask);

        __vxge_hw_pio_mem_write32_upper((u32)VXGE_HW_INTR_MASK_ALL,
                        &vp_reg->xgmac_vp_int_mask);

        __vxge_hw_pio_mem_write32_upper((u32)VXGE_HW_INTR_MASK_ALL,
                        &vp_reg->asic_ntwk_vp_err_mask);

exit:
        return status;
}

/**
 * vxge_hw_device_mask_all - Mask all device interrupts.
 * @hldev: HW device handle.
 *
 * Mask all device interrupts.
 *
 * See also: vxge_hw_device_unmask_all()
 */
void vxge_hw_device_mask_all(struct __vxge_hw_device *hldev)
{
        u64 val64;

        val64 = VXGE_HW_TITAN_MASK_ALL_INT_ALARM |
                        VXGE_HW_TITAN_MASK_ALL_INT_TRAFFIC;

        __vxge_hw_pio_mem_write32_upper((u32)vxge_bVALn(val64, 0, 32),
                        &hldev->common_reg->titan_mask_all_int);

        return;
}

/**
 * vxge_hw_device_unmask_all - Unmask all device interrupts.
 * @hldev: HW device handle.
 *
 * Unmask all device interrupts.
 *
 * See also: vxge_hw_device_mask_all()
 */
void vxge_hw_device_unmask_all(struct __vxge_hw_device *hldev)
{
        u64 val64 = VXGE_HW_TITAN_MASK_ALL_INT_TRAFFIC;

        __vxge_hw_pio_mem_write32_upper((u32)vxge_bVALn(val64, 0, 32),
                        &hldev->common_reg->titan_mask_all_int);

        return;
}

/**
 * vxge_hw_device_intr_enable - Enable interrupts.
 * @hldev: HW device handle.
 *
 * Enable Titan interrupts. The function is to be executed the last in
 * Titan initialization sequence.
 *
 * See also: vxge_hw_device_intr_disable()
 */
void vxge_hw_device_intr_enable(struct __vxge_hw_device *hldev)
{
        u64 val64;
        u32 val32;

        vxge_hw_device_mask_all(hldev);

        vxge_hw_vpath_intr_enable(&hldev->virtual_path);

        val64 = hldev->tim_int_mask0[VXGE_HW_VPATH_INTR_TX] |
                        hldev->tim_int_mask0[VXGE_HW_VPATH_INTR_RX];

        if (val64 != 0) {
                writeq(val64, &hldev->common_reg->tim_int_status0);

                writeq(~val64, &hldev->common_reg->tim_int_mask0);
        }

        val32 = hldev->tim_int_mask1[VXGE_HW_VPATH_INTR_TX] |
                        hldev->tim_int_mask1[VXGE_HW_VPATH_INTR_RX];

        if (val32 != 0) {
                __vxge_hw_pio_mem_write32_upper(val32,
                                &hldev->common_reg->tim_int_status1);

                __vxge_hw_pio_mem_write32_upper(~val32,
                                &hldev->common_reg->tim_int_mask1);
        }

        val64 = readq(&hldev->common_reg->titan_general_int_status);

        /* We have not enabled the top level interrupt yet.
         * This will be controlled from vxge_irq() entry api.
         */
        return;
}

/**
 * vxge_hw_device_intr_disable - Disable Titan interrupts.
 * @hldev: HW device handle.
 *
 * Disable Titan interrupts.
 *
 * See also: vxge_hw_device_intr_enable()
 */
void vxge_hw_device_intr_disable(struct __vxge_hw_device *hldev)
{
        vxge_hw_device_mask_all(hldev);

        /* mask all the tim interrupts */
        writeq(VXGE_HW_INTR_MASK_ALL, &hldev->common_reg->tim_int_mask0);
        __vxge_hw_pio_mem_write32_upper(VXGE_HW_DEFAULT_32,
                                &hldev->common_reg->tim_int_mask1);

        vxge_hw_vpath_intr_disable(&hldev->virtual_path);

        return;
}

/**
 * vxge_hw_ring_rxd_post - Post descriptor on the ring.
 * @ring: Handle to the ring object used for receive
 * @rxdh: Descriptor obtained via vxge_hw_ring_rxd_reserve().
 *
 * Post descriptor on the ring.
 * Prior to posting the descriptor should be filled in accordance with
 * Host/Titan interface specification for a given service (LL, etc.).
 */
void vxge_hw_ring_rxd_post(struct __vxge_hw_ring *ring __unused,
                                struct vxge_hw_ring_rxd_1 *rxdp)
{
        rxdp->control_0 = VXGE_HW_RING_RXD_LIST_OWN_ADAPTER;
}

/**
 * __vxge_hw_non_offload_db_post - Post non offload doorbell
 *
 * @fifo: fifohandle
 * @txdl_ptr: The starting location of the TxDL in host memory
 * @num_txds: The highest TxD in this TxDL (0 to 255 means 1 to 256)
 *
 * This function posts a non-offload doorbell to doorbell FIFO
 *
 */
static void __vxge_hw_non_offload_db_post(struct __vxge_hw_fifo *fifo,
        u64 txdl_ptr, u32 num_txds)
{
        writeq(VXGE_HW_NODBW_TYPE(VXGE_HW_NODBW_TYPE_NODBW) |
                VXGE_HW_NODBW_LAST_TXD_NUMBER(num_txds),
                &fifo->nofl_db->control_0);

        wmb();

        writeq(txdl_ptr, &fifo->nofl_db->txdl_ptr);

        wmb();
}

/**
 * vxge_hw_fifo_free_txdl_get: fetch next available txd in the fifo
 *
 * @fifo: tx channel handle
 */
struct vxge_hw_fifo_txd *
        vxge_hw_fifo_free_txdl_get(struct __vxge_hw_fifo *fifo)
{
        struct vxge_hw_fifo_txd *txdp;

        txdp = fifo->txdl + fifo->sw_offset;
        if (txdp->control_0 & VXGE_HW_FIFO_TXD_LIST_OWN_ADAPTER) {
                vxge_debug(VXGE_ERR, "%s:%d, error: txd(%d) owned by hw\n",
                                __func__, __LINE__, fifo->sw_offset);
                return NULL;
        }

        return txdp;
}
/**
 * vxge_hw_fifo_txdl_buffer_set - Set transmit buffer pointer in the
 * descriptor.
 * @fifo: Handle to the fifo object used for non offload send
 * @txdlh: Descriptor handle.
 * @iob: data buffer.
 */
void vxge_hw_fifo_txdl_buffer_set(struct __vxge_hw_fifo *fifo,
                        struct vxge_hw_fifo_txd *txdp,
                        struct io_buffer *iob)
{
        txdp->control_0 = VXGE_HW_FIFO_TXD_GATHER_CODE(
                        VXGE_HW_FIFO_GATHER_CODE_FIRST_LAST);
        txdp->control_0 |= VXGE_HW_FIFO_TXD_BUFFER_SIZE(iob_len(iob));

        txdp->control_1 = VXGE_HW_FIFO_TXD_INT_NUMBER(fifo->tx_intr_num);
        txdp->control_1 |= VXGE_HW_FIFO_TXD_INT_TYPE_PER_LIST;

        txdp->host_control = (intptr_t)iob;
        txdp->buffer_pointer = virt_to_bus(iob->data);
}

/**
 * vxge_hw_fifo_txdl_post - Post descriptor on the fifo channel.
 * @fifo: Handle to the fifo object used for non offload send
 * @txdp: Tx Descriptor
 *
 * Post descriptor on the 'fifo' type channel for transmission.
 * Prior to posting the descriptor should be filled in accordance with
 * Host/Titan interface specification for a given service (LL, etc.).
 *
 */
void vxge_hw_fifo_txdl_post(struct __vxge_hw_fifo *fifo,
                        struct vxge_hw_fifo_txd *txdp)
{
        txdp->control_0 |= VXGE_HW_FIFO_TXD_LIST_OWN_ADAPTER;

        __vxge_hw_non_offload_db_post(fifo, (u64) virt_to_bus(txdp), 0);

        vxge_hw_fifo_txd_offset_up(&fifo->sw_offset);
}

/*
 * __vxge_hw_vpath_alarm_process - Process Alarms.
 * @vpath: Virtual Path.
 * @skip_alarms: Do not clear the alarms
 *
 * Process vpath alarms.
 *
 */
static enum vxge_hw_status __vxge_hw_vpath_alarm_process(
                        struct __vxge_hw_virtualpath *vpath)
{
        u64 val64;
        u64 alarm_status;
        enum vxge_hw_status status = VXGE_HW_OK;
        struct __vxge_hw_device *hldev = NULL;
        struct vxge_hw_vpath_reg *vp_reg;

        hldev = vpath->hldev;
        vp_reg = vpath->vp_reg;
        alarm_status = readq(&vp_reg->vpath_general_int_status);

        if (alarm_status == VXGE_HW_ALL_FOXES) {

                vxge_debug(VXGE_ERR, "%s: %s:%d, slot freeze error\n",
                        hldev->ndev->name, __func__, __LINE__);
                status = VXGE_HW_ERR_SLOT_FREEZE;
                goto out;
        }

        if (alarm_status & ~(
                VXGE_HW_VPATH_GENERAL_INT_STATUS_PIC_INT |
                VXGE_HW_VPATH_GENERAL_INT_STATUS_PCI_INT |
                VXGE_HW_VPATH_GENERAL_INT_STATUS_WRDMA_INT |
                VXGE_HW_VPATH_GENERAL_INT_STATUS_XMAC_INT)) {

                vxge_debug(VXGE_ERR, "%s: %s:%d, Unknown vpath alarm\n",
                        hldev->ndev->name, __func__, __LINE__);
                status = VXGE_HW_FAIL;
                goto out;
        }

        if (alarm_status & VXGE_HW_VPATH_GENERAL_INT_STATUS_XMAC_INT) {

                val64 = readq(&vp_reg->xgmac_vp_int_status);

                if (val64 &
                VXGE_HW_XGMAC_VP_INT_STATUS_ASIC_NTWK_VP_ERR_ASIC_NTWK_VP_INT) {

                        val64 = readq(&vp_reg->asic_ntwk_vp_err_reg);

                        if (((val64 &
                                VXGE_HW_ASIC_NW_VP_ERR_REG_XMACJ_STN_FLT) &&
                            (!(val64 &
                                VXGE_HW_ASIC_NW_VP_ERR_REG_XMACJ_STN_OK))) ||
                            ((val64 &
                                VXGE_HW_ASIC_NW_VP_ERR_REG_XMACJ_STN_FLT_OCCURR)
                                && (!(val64 &
                                VXGE_HW_ASIC_NW_VP_ERR_REG_XMACJ_STN_OK_OCCURR)
                        ))) {
                                writeq(VXGE_HW_ASIC_NW_VP_ERR_REG_XMACJ_STN_FLT,
                                        &vp_reg->asic_ntwk_vp_err_mask);

                                netdev_link_down(hldev->ndev);
                                vxge_debug(VXGE_INTR, "%s: %s:%d link down\n",
                                        hldev->ndev->name, __func__, __LINE__);
                        }

                        if (((val64 &
                                VXGE_HW_ASIC_NW_VP_ERR_REG_XMACJ_STN_OK) &&
                            (!(val64 &
                                VXGE_HW_ASIC_NW_VP_ERR_REG_XMACJ_STN_FLT))) ||
                            ((val64 &
                                VXGE_HW_ASIC_NW_VP_ERR_REG_XMACJ_STN_OK_OCCURR)
                                && (!(val64 &
                                VXGE_HW_ASIC_NW_VP_ERR_REG_XMACJ_STN_FLT_OCCURR)
                        ))) {
                                writeq(VXGE_HW_ASIC_NW_VP_ERR_REG_XMACJ_STN_OK,
                                        &vp_reg->asic_ntwk_vp_err_mask);

                                netdev_link_up(hldev->ndev);
                                vxge_debug(VXGE_INTR, "%s: %s:%d link up\n",
                                        hldev->ndev->name, __func__, __LINE__);
                        }

                        writeq(VXGE_HW_INTR_MASK_ALL,
                                &vp_reg->asic_ntwk_vp_err_reg);
                }
        } else {
                vxge_debug(VXGE_INFO, "%s: %s:%d unhandled alarm %llx\n",
                                hldev->ndev->name, __func__, __LINE__,
                                alarm_status);
        }
out:
        return status;
}

/**
 * vxge_hw_device_clear_tx_rx - Acknowledge (that is, clear) the
 * condition that has caused the Tx and RX interrupt.
 * @hldev: HW device.
 *
 * Acknowledge (that is, clear) the condition that has caused
 * the Tx and Rx interrupt.
 * See also: vxge_hw_device_begin_irq(),
 * vxge_hw_device_mask_tx_rx(), vxge_hw_device_unmask_tx_rx().
 */
void vxge_hw_device_clear_tx_rx(struct __vxge_hw_device *hldev)
{

        if ((hldev->tim_int_mask0[VXGE_HW_VPATH_INTR_TX] != 0) ||
                        (hldev->tim_int_mask0[VXGE_HW_VPATH_INTR_RX] != 0)) {
                writeq((hldev->tim_int_mask0[VXGE_HW_VPATH_INTR_TX] |
                        hldev->tim_int_mask0[VXGE_HW_VPATH_INTR_RX]),
                        &hldev->common_reg->tim_int_status0);
        }

        if ((hldev->tim_int_mask1[VXGE_HW_VPATH_INTR_TX] != 0) ||
                        (hldev->tim_int_mask1[VXGE_HW_VPATH_INTR_RX] != 0)) {
                __vxge_hw_pio_mem_write32_upper(
                        (hldev->tim_int_mask1[VXGE_HW_VPATH_INTR_TX] |
                        hldev->tim_int_mask1[VXGE_HW_VPATH_INTR_RX]),
                        &hldev->common_reg->tim_int_status1);
        }

        return;
}


/**
 * vxge_hw_device_begin_irq - Begin IRQ processing.
 * @hldev: HW device handle.
 *
 * The function performs two actions, It first checks whether (shared IRQ) the
 * interrupt was raised by the device. Next, it masks the device interrupts.
 *
 * Note:
 * vxge_hw_device_begin_irq() does not flush MMIO writes through the
 * bridge. Therefore, two back-to-back interrupts are potentially possible.
 *
 * Returns: 0, if the interrupt is not "ours" (note that in this case the
 * device remain enabled).
 * Otherwise, vxge_hw_device_begin_irq() returns 64bit general adapter
 * status.
 */
enum vxge_hw_status
vxge_hw_device_begin_irq(struct __vxge_hw_device *hldev)
{
        u64 val64;
        u64 adapter_status;
        u64 vpath_mask;
        enum vxge_hw_status ret = VXGE_HW_OK;

        val64 = readq(&hldev->common_reg->titan_general_int_status);

        if (!val64) {
                ret = VXGE_HW_ERR_WRONG_IRQ;
                goto exit;
        }

        if (val64 == VXGE_HW_ALL_FOXES) {

                adapter_status = readq(&hldev->common_reg->adapter_status);

                if (adapter_status == VXGE_HW_ALL_FOXES) {

                        vxge_debug(VXGE_ERR, "%s: %s:%d critical error "
                                "occurred\n", hldev->ndev->name,
                                __func__, __LINE__);
                        ret = VXGE_HW_ERR_SLOT_FREEZE;
                        goto exit;
                }
        }

        vpath_mask = hldev->vpaths_deployed >>
                                (64 - VXGE_HW_MAX_VIRTUAL_PATHS);
        if (val64 & VXGE_HW_TITAN_GENERAL_INT_STATUS_VPATH_TRAFFIC_INT(
                                vpath_mask))
                vxge_hw_device_clear_tx_rx(hldev);

        if (val64 & VXGE_HW_TITAN_GENERAL_INT_STATUS_VPATH_ALARM_INT)
                ret = __vxge_hw_vpath_alarm_process(&hldev->virtual_path);

exit:
        return ret;
}

/**
 * vxge_hw_vpath_doorbell_rx - Indicates to hw the qwords of receive
 * descriptors posted.
 * @ring: Handle to the ring object used for receive
 *
 * The function writes the number of qwords of rxds posted during replishment.
 * Since the function is called frequently, a flush is not required to post the
 * write transaction. At the very least, the previous write will be flushed
 * once the subsequent write is made.
 *
 * Returns: None.
 */
void vxge_hw_vpath_doorbell_rx(struct __vxge_hw_ring *ring)
{
        u32 rxds_qw_per_block = VXGE_HW_MAX_RXDS_PER_BLOCK_1 *
                VXGE_HW_RING_RXD_QWORDS_MODE_1;

        ring->doorbell_cnt += VXGE_HW_RING_RXD_QWORDS_MODE_1;

        ring->total_db_cnt += VXGE_HW_RING_RXD_QWORDS_MODE_1;

        if (ring->total_db_cnt >= rxds_qw_per_block) {
                /* For each block add 4 more qwords */
                ring->doorbell_cnt += VXGE_HW_RING_RXD_QWORDS_MODE_1;

                /* Reset total count */
                ring->total_db_cnt -= rxds_qw_per_block;
        }

        if (ring->doorbell_cnt >= ring->rxd_qword_limit) {
                wmb();
                writeq(VXGE_HW_PRC_RXD_DOORBELL_NEW_QW_CNT(
                        ring->doorbell_cnt),
                        &ring->vp_reg->prc_rxd_doorbell);
                ring->doorbell_cnt = 0;
        }
}

/**
 * vxge_hw_vpath_poll_rx - Poll Rx Virtual Path for completed
 * descriptors and process the same.
 * @ring: Handle to the ring object used for receive
 *
 * The function polls the Rx for the completed  descriptors.
 */
#define ETH_FCS_LEN     4
enum vxge_hw_status vxge_hw_vpath_poll_rx(struct __vxge_hw_ring *ring)
{
        struct __vxge_hw_device *hldev;
        enum vxge_hw_status status = VXGE_HW_OK;
        struct vxge_hw_ring_rxd_1 *rxd;
        unsigned int len;
        enum vxge_hw_ring_tcode tcode;
        struct io_buffer *rx_iob, *iobuf = NULL;
        u16 poll_count = 0;

        hldev = ring->vpathh->hldev;

        do {
                rxd = &ring->rxdl->rxd[ring->rxd_offset];
                tcode = VXGE_HW_RING_RXD_T_CODE_GET(rxd->control_0);

                /* if tcode is VXGE_HW_RING_T_CODE_FRM_DROP, it is
                 * possible the ownership bit still set to adapter
                 */
                if ((rxd->control_0 & VXGE_HW_RING_RXD_LIST_OWN_ADAPTER)
                        && (tcode == VXGE_HW_RING_T_CODE_OK)) {

                        status = VXGE_HW_INF_NO_MORE_COMPLETED_DESCRIPTORS;
                        goto err0;
                }

                vxge_debug(VXGE_INFO, "%s: rx frame received at offset %d\n",
                        hldev->ndev->name, ring->rxd_offset);

                iobuf = (struct io_buffer *)(intptr_t)rxd->host_control;

                if (tcode != VXGE_HW_RING_T_CODE_OK) {
                        netdev_rx_err(hldev->ndev, NULL, -EINVAL);
                        vxge_debug(VXGE_ERR, "%s:%d, rx error tcode %d\n",
                                __func__, __LINE__, tcode);
                        status = VXGE_HW_FAIL;
                        goto err1;
                }

                len = VXGE_HW_RING_RXD_1_BUFFER0_SIZE_GET(rxd->control_1);
                len -= ETH_FCS_LEN;

                rx_iob = alloc_iob(len);
                if (!rx_iob) {
                        netdev_rx_err(hldev->ndev, NULL, -ENOMEM);
                        vxge_debug(VXGE_ERR, "%s:%d, alloc_iob error\n",
                                __func__, __LINE__);
                        status = VXGE_HW_ERR_OUT_OF_MEMORY;
                        goto err1;
                }

                memcpy(iob_put(rx_iob, len), iobuf->data, len);
                /* Add this packet to the receive queue. */
                netdev_rx(hldev->ndev, rx_iob);

err1:
                /* repost the rxd */
                rxd->control_0 = rxd->control_1 = 0;
                vxge_hw_ring_rxd_1b_set(rxd, iobuf,
                                VXGE_LL_MAX_FRAME_SIZE(hldev->vdev));
                vxge_hw_ring_rxd_post(ring, rxd);

                /* repost the qword count for doorbell */
                vxge_hw_vpath_doorbell_rx(ring);

                /* increment the descriptor offset */
                vxge_hw_ring_rxd_offset_up(&ring->rxd_offset);

        } while (++poll_count < ring->rx_poll_weight);
err0:
        return status;
}

/**
 * vxge_hw_vpath_poll_tx - Poll Tx for completed descriptors and process
 * the same.
 * @fifo: Handle to the fifo object used for non offload send
 *
 * The function polls the Tx for the completed  descriptors and calls
 * the driver via supplied completion callback.
 */
enum vxge_hw_status vxge_hw_vpath_poll_tx(struct __vxge_hw_fifo *fifo)
{
        enum vxge_hw_status status = VXGE_HW_OK;
        struct vxge_hw_fifo_txd *txdp;

        txdp = fifo->txdl + fifo->hw_offset;
        if (!(txdp->control_0 & VXGE_HW_FIFO_TXD_LIST_OWN_ADAPTER)
                && (txdp->host_control)) {

                vxge_xmit_compl(fifo, txdp,
                        VXGE_HW_FIFO_TXD_T_CODE_GET(txdp->control_0));

                vxge_hw_fifo_txd_offset_up(&fifo->hw_offset);
        }

        return status;
}