// SPDX-License-Identifier: GPL-2.0
/* Copyright(c) 1999 - 2018 Intel Corporation. */

#include "ixgbe.h"
#include <linux/if_ether.h>
#include <linux/gfp.h>
#include <linux/if_vlan.h>
#include <generated/utsrelease.h>
#include <scsi/scsi_cmnd.h>
#include <scsi/scsi_device.h>
#include <scsi/fc/fc_fs.h>
#include <scsi/fc/fc_fcoe.h>
#include <scsi/libfc.h>
#include <scsi/libfcoe.h>

/**
 * ixgbe_fcoe_clear_ddp - clear the given ddp context
 * @ddp: ptr to the ixgbe_fcoe_ddp
 *
 * Returns : none
 *
 */
static inline void ixgbe_fcoe_clear_ddp(struct ixgbe_fcoe_ddp *ddp)
{
        ddp->len = 0;
        ddp->err = 1;
        ddp->udl = NULL;
        ddp->udp = 0UL;
        ddp->sgl = NULL;
        ddp->sgc = 0;
}

/**
 * ixgbe_fcoe_ddp_put - free the ddp context for a given xid
 * @netdev: the corresponding net_device
 * @xid: the xid that corresponding ddp will be freed
 *
 * This is the implementation of net_device_ops.ndo_fcoe_ddp_done
 * and it is expected to be called by ULD, i.e., FCP layer of libfc
 * to release the corresponding ddp context when the I/O is done.
 *
 * Returns : data length already ddp-ed in bytes
 */
int ixgbe_fcoe_ddp_put(struct net_device *netdev, u16 xid)
{
        int len;
        struct ixgbe_fcoe *fcoe;
        struct ixgbe_adapter *adapter;
        struct ixgbe_fcoe_ddp *ddp;
        struct ixgbe_hw *hw;
        u32 fcbuff;

        if (!netdev)
                return 0;

        if (xid >= netdev->fcoe_ddp_xid)
                return 0;

        adapter = ixgbe_from_netdev(netdev);
        fcoe = &adapter->fcoe;
        ddp = &fcoe->ddp[xid];
        if (!ddp->udl)
                return 0;

        hw = &adapter->hw;
        len = ddp->len;
        /* if no error then skip ddp context invalidation */
        if (!ddp->err)
                goto skip_ddpinv;

        if (hw->mac.type == ixgbe_mac_X550) {
                /* X550 does not require DDP FCoE lock */

                IXGBE_WRITE_REG(hw, IXGBE_FCDFC(0, xid), 0);
                IXGBE_WRITE_REG(hw, IXGBE_FCDFC(3, xid),
                                (xid | IXGBE_FCFLTRW_WE));

                /* program FCBUFF */
                IXGBE_WRITE_REG(hw, IXGBE_FCDDC(2, xid), 0);

                /* program FCDMARW */
                IXGBE_WRITE_REG(hw, IXGBE_FCDDC(3, xid),
                                (xid | IXGBE_FCDMARW_WE));

                /* read FCBUFF to check context invalidated */
                IXGBE_WRITE_REG(hw, IXGBE_FCDDC(3, xid),
                                (xid | IXGBE_FCDMARW_RE));
                fcbuff = IXGBE_READ_REG(hw, IXGBE_FCDDC(2, xid));
        } else {
                /* other hardware requires DDP FCoE lock */
                spin_lock_bh(&fcoe->lock);
                IXGBE_WRITE_REG(hw, IXGBE_FCFLT, 0);
                IXGBE_WRITE_REG(hw, IXGBE_FCFLTRW,
                                (xid | IXGBE_FCFLTRW_WE));
                IXGBE_WRITE_REG(hw, IXGBE_FCBUFF, 0);
                IXGBE_WRITE_REG(hw, IXGBE_FCDMARW,
                                (xid | IXGBE_FCDMARW_WE));

                /* guaranteed to be invalidated after 100us */
                IXGBE_WRITE_REG(hw, IXGBE_FCDMARW,
                                (xid | IXGBE_FCDMARW_RE));
                fcbuff = IXGBE_READ_REG(hw, IXGBE_FCBUFF);
                spin_unlock_bh(&fcoe->lock);
                }

        if (fcbuff & IXGBE_FCBUFF_VALID)
                usleep_range(100, 150);

skip_ddpinv:
        if (ddp->sgl)
                dma_unmap_sg(&adapter->pdev->dev, ddp->sgl, ddp->sgc,
                             DMA_FROM_DEVICE);
        if (ddp->pool) {
                dma_pool_free(ddp->pool, ddp->udl, ddp->udp);
                ddp->pool = NULL;
        }

        ixgbe_fcoe_clear_ddp(ddp);

        return len;
}

/**
 * ixgbe_fcoe_ddp_setup - called to set up ddp context
 * @netdev: the corresponding net_device
 * @xid: the exchange id requesting ddp
 * @sgl: the scatter-gather list for this request
 * @sgc: the number of scatter-gather items
 * @target_mode: 1 to setup target mode, 0 to setup initiator mode
 *
 * Returns : 1 for success and 0 for no ddp
 */
static int ixgbe_fcoe_ddp_setup(struct net_device *netdev, u16 xid,
                                struct scatterlist *sgl, unsigned int sgc,
                                int target_mode)
{
        struct ixgbe_adapter *adapter;
        struct ixgbe_hw *hw;
        struct ixgbe_fcoe *fcoe;
        struct ixgbe_fcoe_ddp *ddp;
        struct ixgbe_fcoe_ddp_pool *ddp_pool;
        struct scatterlist *sg;
        unsigned int i, j, dmacount;
        unsigned int len;
        static const unsigned int bufflen = IXGBE_FCBUFF_MIN;
        unsigned int firstoff = 0;
        unsigned int lastsize;
        unsigned int thisoff = 0;
        unsigned int thislen = 0;
        u32 fcbuff, fcdmarw, fcfltrw, fcrxctl;
        dma_addr_t addr = 0;

        if (!netdev || !sgl)
                return 0;

        adapter = ixgbe_from_netdev(netdev);
        if (xid >= netdev->fcoe_ddp_xid) {
                e_warn(drv, "xid=0x%x out-of-range\n", xid);
                return 0;
        }

        /* no DDP if we are already down or resetting */
        if (test_bit(__IXGBE_DOWN, &adapter->state) ||
            test_bit(__IXGBE_RESETTING, &adapter->state))
                return 0;

        fcoe = &adapter->fcoe;
        ddp = &fcoe->ddp[xid];
        if (ddp->sgl) {
                e_err(drv, "xid 0x%x w/ non-null sgl=%p nents=%d\n",
                      xid, ddp->sgl, ddp->sgc);
                return 0;
        }
        ixgbe_fcoe_clear_ddp(ddp);


        if (!fcoe->ddp_pool) {
                e_warn(drv, "No ddp_pool resources allocated\n");
                return 0;
        }

        ddp_pool = per_cpu_ptr(fcoe->ddp_pool, get_cpu());
        if (!ddp_pool->pool) {
                e_warn(drv, "xid=0x%x no ddp pool for fcoe\n", xid);
                goto out_noddp;
        }

        /* setup dma from scsi command sgl */
        dmacount = dma_map_sg(&adapter->pdev->dev, sgl, sgc, DMA_FROM_DEVICE);
        if (dmacount == 0) {
                e_err(drv, "xid 0x%x DMA map error\n", xid);
                goto out_noddp;
        }

        /* alloc the udl from per cpu ddp pool */
        ddp->udl = dma_pool_alloc(ddp_pool->pool, GFP_ATOMIC, &ddp->udp);
        if (!ddp->udl) {
                e_err(drv, "failed allocated ddp context\n");
                goto out_noddp_unmap;
        }
        ddp->pool = ddp_pool->pool;
        ddp->sgl = sgl;
        ddp->sgc = sgc;

        j = 0;
        for_each_sg(sgl, sg, dmacount, i) {
                addr = sg_dma_address(sg);
                len = sg_dma_len(sg);
                while (len) {
                        /* max number of buffers allowed in one DDP context */
                        if (j >= IXGBE_BUFFCNT_MAX) {
                                ddp_pool->noddp++;
                                goto out_noddp_free;
                        }

                        /* get the offset of length of current buffer */
                        thisoff = addr & ((dma_addr_t)bufflen - 1);
                        thislen = min((bufflen - thisoff), len);
                        /*
                         * all but the 1st buffer (j == 0)
                         * must be aligned on bufflen
                         */
                        if ((j != 0) && (thisoff))
                                goto out_noddp_free;
                        /*
                         * all but the last buffer
                         * ((i == (dmacount - 1)) && (thislen == len))
                         * must end at bufflen
                         */
                        if (((i != (dmacount - 1)) || (thislen != len))
                            && ((thislen + thisoff) != bufflen))
                                goto out_noddp_free;

                        ddp->udl[j] = (u64)(addr - thisoff);
                        /* only the first buffer may have none-zero offset */
                        if (j == 0)
                                firstoff = thisoff;
                        len -= thislen;
                        addr += thislen;
                        j++;
                }
        }
        /* only the last buffer may have non-full bufflen */
        lastsize = thisoff + thislen;

        /*
         * lastsize can not be buffer len.
         * If it is then adding another buffer with lastsize = 1.
         */
        if (lastsize == bufflen) {
                if (j >= IXGBE_BUFFCNT_MAX) {
                        ddp_pool->noddp_ext_buff++;
                        goto out_noddp_free;
                }

                ddp->udl[j] = (u64)(fcoe->extra_ddp_buffer_dma);
                j++;
                lastsize = 1;
        }
        put_cpu();

        fcbuff = (IXGBE_FCBUFF_4KB << IXGBE_FCBUFF_BUFFSIZE_SHIFT);
        fcbuff |= ((j & 0xff) << IXGBE_FCBUFF_BUFFCNT_SHIFT);
        fcbuff |= (firstoff << IXGBE_FCBUFF_OFFSET_SHIFT);
        /* Set WRCONTX bit to allow DDP for target */
        if (target_mode)
                fcbuff |= (IXGBE_FCBUFF_WRCONTX);
        fcbuff |= (IXGBE_FCBUFF_VALID);

        fcdmarw = xid;
        fcdmarw |= IXGBE_FCDMARW_WE;
        fcdmarw |= (lastsize << IXGBE_FCDMARW_LASTSIZE_SHIFT);

        fcfltrw = xid;
        fcfltrw |= IXGBE_FCFLTRW_WE;

        /* program DMA context */
        hw = &adapter->hw;

        /* turn on last frame indication for target mode as FCP_RSPtarget is
         * supposed to send FCP_RSP when it is done. */
        if (target_mode && !test_bit(__IXGBE_FCOE_TARGET, &fcoe->mode)) {
                set_bit(__IXGBE_FCOE_TARGET, &fcoe->mode);
                fcrxctl = IXGBE_READ_REG(hw, IXGBE_FCRXCTRL);
                fcrxctl |= IXGBE_FCRXCTRL_LASTSEQH;
                IXGBE_WRITE_REG(hw, IXGBE_FCRXCTRL, fcrxctl);
        }

        if (hw->mac.type == ixgbe_mac_X550) {
                /* X550 does not require DDP lock */

                IXGBE_WRITE_REG(hw, IXGBE_FCDDC(0, xid),
                                ddp->udp & DMA_BIT_MASK(32));
                IXGBE_WRITE_REG(hw, IXGBE_FCDDC(1, xid), (u64)ddp->udp >> 32);
                IXGBE_WRITE_REG(hw, IXGBE_FCDDC(2, xid), fcbuff);
                IXGBE_WRITE_REG(hw, IXGBE_FCDDC(3, xid), fcdmarw);
                /* program filter context */
                IXGBE_WRITE_REG(hw, IXGBE_FCDFC(0, xid), IXGBE_FCFLT_VALID);
                IXGBE_WRITE_REG(hw, IXGBE_FCDFC(1, xid), 0);
                IXGBE_WRITE_REG(hw, IXGBE_FCDFC(3, xid), fcfltrw);
        } else {
                /* DDP lock for indirect DDP context access */
                spin_lock_bh(&fcoe->lock);

                IXGBE_WRITE_REG(hw, IXGBE_FCPTRL, ddp->udp & DMA_BIT_MASK(32));
                IXGBE_WRITE_REG(hw, IXGBE_FCPTRH, (u64)ddp->udp >> 32);
                IXGBE_WRITE_REG(hw, IXGBE_FCBUFF, fcbuff);
                IXGBE_WRITE_REG(hw, IXGBE_FCDMARW, fcdmarw);
                /* program filter context */
                IXGBE_WRITE_REG(hw, IXGBE_FCPARAM, 0);
                IXGBE_WRITE_REG(hw, IXGBE_FCFLT, IXGBE_FCFLT_VALID);
                IXGBE_WRITE_REG(hw, IXGBE_FCFLTRW, fcfltrw);

                spin_unlock_bh(&fcoe->lock);
        }

        return 1;

out_noddp_free:
        dma_pool_free(ddp->pool, ddp->udl, ddp->udp);
        ixgbe_fcoe_clear_ddp(ddp);

out_noddp_unmap:
        dma_unmap_sg(&adapter->pdev->dev, sgl, sgc, DMA_FROM_DEVICE);
out_noddp:
        put_cpu();
        return 0;
}

/**
 * ixgbe_fcoe_ddp_get - called to set up ddp context in initiator mode
 * @netdev: the corresponding net_device
 * @xid: the exchange id requesting ddp
 * @sgl: the scatter-gather list for this request
 * @sgc: the number of scatter-gather items
 *
 * This is the implementation of net_device_ops.ndo_fcoe_ddp_setup
 * and is expected to be called from ULD, e.g., FCP layer of libfc
 * to set up ddp for the corresponding xid of the given sglist for
 * the corresponding I/O.
 *
 * Returns : 1 for success and 0 for no ddp
 */
int ixgbe_fcoe_ddp_get(struct net_device *netdev, u16 xid,
                       struct scatterlist *sgl, unsigned int sgc)
{
        return ixgbe_fcoe_ddp_setup(netdev, xid, sgl, sgc, 0);
}

/**
 * ixgbe_fcoe_ddp_target - called to set up ddp context in target mode
 * @netdev: the corresponding net_device
 * @xid: the exchange id requesting ddp
 * @sgl: the scatter-gather list for this request
 * @sgc: the number of scatter-gather items
 *
 * This is the implementation of net_device_ops.ndo_fcoe_ddp_target
 * and is expected to be called from ULD, e.g., FCP layer of libfc
 * to set up ddp for the corresponding xid of the given sglist for
 * the corresponding I/O. The DDP in target mode is a write I/O request
 * from the initiator.
 *
 * Returns : 1 for success and 0 for no ddp
 */
int ixgbe_fcoe_ddp_target(struct net_device *netdev, u16 xid,
                            struct scatterlist *sgl, unsigned int sgc)
{
        return ixgbe_fcoe_ddp_setup(netdev, xid, sgl, sgc, 1);
}

/**
 * ixgbe_fcoe_ddp - check ddp status and mark it done
 * @adapter: ixgbe adapter
 * @rx_desc: advanced rx descriptor
 * @skb: the skb holding the received data
 *
 * This checks ddp status.
 *
 * Returns : < 0 indicates an error or not a FCiE ddp, 0 indicates
 * not passing the skb to ULD, > 0 indicates is the length of data
 * being ddped.
 */
int ixgbe_fcoe_ddp(struct ixgbe_adapter *adapter,
                   union ixgbe_adv_rx_desc *rx_desc,
                   struct sk_buff *skb)
{
        int rc = -EINVAL;
        struct ixgbe_fcoe *fcoe;
        struct ixgbe_fcoe_ddp *ddp;
        struct fc_frame_header *fh;
        struct fcoe_crc_eof *crc;
        __le32 fcerr = ixgbe_test_staterr(rx_desc, IXGBE_RXDADV_ERR_FCERR);
        __le32 ddp_err;
        int ddp_max;
        u32 fctl;
        u16 xid;

        if (fcerr == cpu_to_le32(IXGBE_FCERR_BADCRC))
                skb->ip_summed = CHECKSUM_NONE;
        else
                skb->ip_summed = CHECKSUM_UNNECESSARY;

        if (eth_hdr(skb)->h_proto == htons(ETH_P_8021Q))
                fh = (struct fc_frame_header *)(skb->data +
                        sizeof(struct vlan_hdr) + sizeof(struct fcoe_hdr));
        else
                fh = (struct fc_frame_header *)(skb->data +
                        sizeof(struct fcoe_hdr));

        fctl = ntoh24(fh->fh_f_ctl);
        if (fctl & FC_FC_EX_CTX)
                xid =  be16_to_cpu(fh->fh_ox_id);
        else
                xid =  be16_to_cpu(fh->fh_rx_id);

        ddp_max = IXGBE_FCOE_DDP_MAX;
        /* X550 has different DDP Max limit */
        if (adapter->hw.mac.type == ixgbe_mac_X550)
                ddp_max = IXGBE_FCOE_DDP_MAX_X550;
        if (xid >= ddp_max)
                return -EINVAL;

        fcoe = &adapter->fcoe;
        ddp = &fcoe->ddp[xid];
        if (!ddp->udl)
                return -EINVAL;

        ddp_err = ixgbe_test_staterr(rx_desc, IXGBE_RXDADV_ERR_FCEOFE |
                                              IXGBE_RXDADV_ERR_FCERR);
        if (ddp_err)
                return -EINVAL;

        switch (ixgbe_test_staterr(rx_desc, IXGBE_RXDADV_STAT_FCSTAT)) {
        /* return 0 to bypass going to ULD for DDPed data */
        case cpu_to_le32(IXGBE_RXDADV_STAT_FCSTAT_DDP):
                /* update length of DDPed data */
                ddp->len = le32_to_cpu(rx_desc->wb.lower.hi_dword.rss);
                rc = 0;
                break;
        /* unmap the sg list when FCPRSP is received */
        case cpu_to_le32(IXGBE_RXDADV_STAT_FCSTAT_FCPRSP):
                dma_unmap_sg(&adapter->pdev->dev, ddp->sgl,
                             ddp->sgc, DMA_FROM_DEVICE);
                ddp->err = (__force u32)ddp_err;
                ddp->sgl = NULL;
                ddp->sgc = 0;
                fallthrough;
        /* if DDP length is present pass it through to ULD */
        case cpu_to_le32(IXGBE_RXDADV_STAT_FCSTAT_NODDP):
                /* update length of DDPed data */
                ddp->len = le32_to_cpu(rx_desc->wb.lower.hi_dword.rss);
                if (ddp->len)
                        rc = ddp->len;
                break;
        /* no match will return as an error */
        case cpu_to_le32(IXGBE_RXDADV_STAT_FCSTAT_NOMTCH):
        default:
                break;
        }

        /* In target mode, check the last data frame of the sequence.
         * For DDP in target mode, data is already DDPed but the header
         * indication of the last data frame ould allow is to tell if we
         * got all the data and the ULP can send FCP_RSP back, as this is
         * not a full fcoe frame, we fill the trailer here so it won't be
         * dropped by the ULP stack.
         */
        if ((fh->fh_r_ctl == FC_RCTL_DD_SOL_DATA) &&
            (fctl & FC_FC_END_SEQ)) {
                skb_linearize(skb);
                crc = skb_put(skb, sizeof(*crc));
                crc->fcoe_eof = FC_EOF_T;
        }

        return rc;
}

/**
 * ixgbe_fso - ixgbe FCoE Sequence Offload (FSO)
 * @tx_ring: tx desc ring
 * @first: first tx_buffer structure containing skb, tx_flags, and protocol
 * @hdr_len: hdr_len to be returned
 *
 * This sets up large send offload for FCoE
 *
 * Returns : 0 indicates success, < 0 for error
 */
int ixgbe_fso(struct ixgbe_ring *tx_ring,
              struct ixgbe_tx_buffer *first,
              u8 *hdr_len)
{
        struct sk_buff *skb = first->skb;
        struct fc_frame_header *fh;
        u32 vlan_macip_lens;
        u32 fcoe_sof_eof = 0;
        u32 mss_l4len_idx;
        u32 type_tucmd = IXGBE_ADVTXT_TUCMD_FCOE;
        u8 sof, eof;

        if (skb_is_gso(skb) && (skb_shinfo(skb)->gso_type != SKB_GSO_FCOE)) {
                dev_err(tx_ring->dev, "Wrong gso type %d:expecting SKB_GSO_FCOE\n",
                        skb_shinfo(skb)->gso_type);
                return -EINVAL;
        }

        /* resets the header to point fcoe/fc */
        skb_set_network_header(skb, skb->mac_len);
        skb_set_transport_header(skb, skb->mac_len +
                                 sizeof(struct fcoe_hdr));

        /* sets up SOF and ORIS */
        sof = ((struct fcoe_hdr *)skb_network_header(skb))->fcoe_sof;
        switch (sof) {
        case FC_SOF_I2:
                fcoe_sof_eof = IXGBE_ADVTXD_FCOEF_ORIS;
                break;
        case FC_SOF_I3:
                fcoe_sof_eof = IXGBE_ADVTXD_FCOEF_SOF |
                               IXGBE_ADVTXD_FCOEF_ORIS;
                break;
        case FC_SOF_N2:
                break;
        case FC_SOF_N3:
                fcoe_sof_eof = IXGBE_ADVTXD_FCOEF_SOF;
                break;
        default:
                dev_warn(tx_ring->dev, "unknown sof = 0x%x\n", sof);
                return -EINVAL;
        }

        /* the first byte of the last dword is EOF */
        skb_copy_bits(skb, skb->len - 4, &eof, 1);
        /* sets up EOF and ORIE */
        switch (eof) {
        case FC_EOF_N:
                fcoe_sof_eof |= IXGBE_ADVTXD_FCOEF_EOF_N;
                break;
        case FC_EOF_T:
                /* lso needs ORIE */
                if (skb_is_gso(skb))
                        fcoe_sof_eof |= IXGBE_ADVTXD_FCOEF_EOF_N |
                                        IXGBE_ADVTXD_FCOEF_ORIE;
                else
                        fcoe_sof_eof |= IXGBE_ADVTXD_FCOEF_EOF_T;
                break;
        case FC_EOF_NI:
                fcoe_sof_eof |= IXGBE_ADVTXD_FCOEF_EOF_NI;
                break;
        case FC_EOF_A:
                fcoe_sof_eof |= IXGBE_ADVTXD_FCOEF_EOF_A;
                break;
        default:
                dev_warn(tx_ring->dev, "unknown eof = 0x%x\n", eof);
                return -EINVAL;
        }

        /* sets up PARINC indicating data offset */
        fh = (struct fc_frame_header *)skb_transport_header(skb);
        if (fh->fh_f_ctl[2] & FC_FC_REL_OFF)
                fcoe_sof_eof |= IXGBE_ADVTXD_FCOEF_PARINC;

        /* include trailer in headlen as it is replicated per frame */
        *hdr_len = sizeof(struct fcoe_crc_eof);

        /* hdr_len includes fc_hdr if FCoE LSO is enabled */
        if (skb_is_gso(skb)) {
                *hdr_len += skb_transport_offset(skb) +
                            sizeof(struct fc_frame_header);
                /* update gso_segs and bytecount */
                first->gso_segs = DIV_ROUND_UP(skb->len - *hdr_len,
                                               skb_shinfo(skb)->gso_size);
                first->bytecount += (first->gso_segs - 1) * *hdr_len;
                first->tx_flags |= IXGBE_TX_FLAGS_TSO;
                /* Hardware expects L4T to be RSV for FCoE TSO */
                type_tucmd |= IXGBE_ADVTXD_TUCMD_L4T_RSV;
        }

        /* set flag indicating FCOE to ixgbe_tx_map call */
        first->tx_flags |= IXGBE_TX_FLAGS_FCOE | IXGBE_TX_FLAGS_CC;

        /* mss_l4len_id: use 0 for FSO as TSO, no need for L4LEN */
        mss_l4len_idx = skb_shinfo(skb)->gso_size << IXGBE_ADVTXD_MSS_SHIFT;

        /* vlan_macip_lens: HEADLEN, MACLEN, VLAN tag */
        vlan_macip_lens = skb_transport_offset(skb) +
                          sizeof(struct fc_frame_header);
        vlan_macip_lens |= (skb_transport_offset(skb) - 4)
                           << IXGBE_ADVTXD_MACLEN_SHIFT;
        vlan_macip_lens |= first->tx_flags & IXGBE_TX_FLAGS_VLAN_MASK;

        /* write context desc */
        ixgbe_tx_ctxtdesc(tx_ring, vlan_macip_lens, fcoe_sof_eof,
                          type_tucmd, mss_l4len_idx);

        return 0;
}

static void ixgbe_fcoe_dma_pool_free(struct ixgbe_fcoe *fcoe, unsigned int cpu)
{
        struct ixgbe_fcoe_ddp_pool *ddp_pool;

        ddp_pool = per_cpu_ptr(fcoe->ddp_pool, cpu);
        dma_pool_destroy(ddp_pool->pool);
        ddp_pool->pool = NULL;
}

static int ixgbe_fcoe_dma_pool_alloc(struct ixgbe_fcoe *fcoe,
                                     struct device *dev,
                                     unsigned int cpu)
{
        struct ixgbe_fcoe_ddp_pool *ddp_pool;
        struct dma_pool *pool;
        char pool_name[32];

        snprintf(pool_name, 32, "ixgbe_fcoe_ddp_%u", cpu);

        pool = dma_pool_create(pool_name, dev, IXGBE_FCPTR_MAX,
                               IXGBE_FCPTR_ALIGN, PAGE_SIZE);
        if (!pool)
                return -ENOMEM;

        ddp_pool = per_cpu_ptr(fcoe->ddp_pool, cpu);
        ddp_pool->pool = pool;
        ddp_pool->noddp = 0;
        ddp_pool->noddp_ext_buff = 0;

        return 0;
}

/**
 * ixgbe_configure_fcoe - configures registers for fcoe at start
 * @adapter: ptr to ixgbe adapter
 *
 * This sets up FCoE related registers
 *
 * Returns : none
 */
void ixgbe_configure_fcoe(struct ixgbe_adapter *adapter)
{
        struct ixgbe_ring_feature *fcoe = &adapter->ring_feature[RING_F_FCOE];
        struct ixgbe_hw *hw = &adapter->hw;
        int i, fcoe_q, fcoe_i, fcoe_q_h = 0;
        int fcreta_size;
        u32 etqf;

        /* Minimal functionality for FCoE requires at least CRC offloads */
        if (!(adapter->netdev->features & NETIF_F_FCOE_CRC))
                return;

        /* Enable L2 EtherType filter for FCoE, needed for FCoE CRC and DDP */
        etqf = ETH_P_FCOE | IXGBE_ETQF_FCOE | IXGBE_ETQF_FILTER_EN;
        if (adapter->flags & IXGBE_FLAG_SRIOV_ENABLED) {
                etqf |= IXGBE_ETQF_POOL_ENABLE;
                etqf |= VMDQ_P(0) << IXGBE_ETQF_POOL_SHIFT;
        }
        IXGBE_WRITE_REG(hw, IXGBE_ETQF(IXGBE_ETQF_FILTER_FCOE), etqf);
        IXGBE_WRITE_REG(hw, IXGBE_ETQS(IXGBE_ETQF_FILTER_FCOE), 0);

        /* leave registers un-configured if FCoE is disabled */
        if (!(adapter->flags & IXGBE_FLAG_FCOE_ENABLED))
                return;

        /* Use one or more Rx queues for FCoE by redirection table */
        fcreta_size = IXGBE_FCRETA_SIZE;
        if (adapter->hw.mac.type == ixgbe_mac_X550)
                fcreta_size = IXGBE_FCRETA_SIZE_X550;

        for (i = 0; i < fcreta_size; i++) {
                if (adapter->hw.mac.type == ixgbe_mac_X550) {
                        int fcoe_i_h = fcoe->offset + ((i + fcreta_size) %
                                                        fcoe->indices);
                        fcoe_q_h = adapter->rx_ring[fcoe_i_h]->reg_idx;
                        fcoe_q_h = FIELD_PREP(IXGBE_FCRETA_ENTRY_HIGH_MASK,
                                              fcoe_q_h);
                }

                fcoe_i = fcoe->offset + (i % fcoe->indices);
                fcoe_i &= IXGBE_FCRETA_ENTRY_MASK;
                fcoe_q = adapter->rx_ring[fcoe_i]->reg_idx;
                fcoe_q |= fcoe_q_h;
                IXGBE_WRITE_REG(hw, IXGBE_FCRETA(i), fcoe_q);
        }
        IXGBE_WRITE_REG(hw, IXGBE_FCRECTL, IXGBE_FCRECTL_ENA);

        /* Enable L2 EtherType filter for FIP */
        etqf = ETH_P_FIP | IXGBE_ETQF_FILTER_EN;
        if (adapter->flags & IXGBE_FLAG_SRIOV_ENABLED) {
                etqf |= IXGBE_ETQF_POOL_ENABLE;
                etqf |= VMDQ_P(0) << IXGBE_ETQF_POOL_SHIFT;
        }
        IXGBE_WRITE_REG(hw, IXGBE_ETQF(IXGBE_ETQF_FILTER_FIP), etqf);

        /* Send FIP frames to the first FCoE queue */
        fcoe_q = adapter->rx_ring[fcoe->offset]->reg_idx;
        IXGBE_WRITE_REG(hw, IXGBE_ETQS(IXGBE_ETQF_FILTER_FIP),
                        IXGBE_ETQS_QUEUE_EN |
                        (fcoe_q << IXGBE_ETQS_RX_QUEUE_SHIFT));

        /* Configure FCoE Rx control */
        IXGBE_WRITE_REG(hw, IXGBE_FCRXCTRL,
                        IXGBE_FCRXCTRL_FCCRCBO |
                        (FC_FCOE_VER << IXGBE_FCRXCTRL_FCOEVER_SHIFT));
}

/**
 * ixgbe_free_fcoe_ddp_resources - release all fcoe ddp context resources
 * @adapter : ixgbe adapter
 *
 * Cleans up outstanding ddp context resources
 *
 * Returns : none
 */
void ixgbe_free_fcoe_ddp_resources(struct ixgbe_adapter *adapter)
{
        struct ixgbe_fcoe *fcoe = &adapter->fcoe;
        int cpu, i, ddp_max;

        /* do nothing if no DDP pools were allocated */
        if (!fcoe->ddp_pool)
                return;

        ddp_max = IXGBE_FCOE_DDP_MAX;
        /* X550 has different DDP Max limit */
        if (adapter->hw.mac.type == ixgbe_mac_X550)
                ddp_max = IXGBE_FCOE_DDP_MAX_X550;

        for (i = 0; i < ddp_max; i++)
                ixgbe_fcoe_ddp_put(adapter->netdev, i);

        for_each_possible_cpu(cpu)
                ixgbe_fcoe_dma_pool_free(fcoe, cpu);

        dma_unmap_single(&adapter->pdev->dev,
                         fcoe->extra_ddp_buffer_dma,
                         IXGBE_FCBUFF_MIN,
                         DMA_FROM_DEVICE);
        kfree(fcoe->extra_ddp_buffer);

        fcoe->extra_ddp_buffer = NULL;
        fcoe->extra_ddp_buffer_dma = 0;
}

/**
 * ixgbe_setup_fcoe_ddp_resources - setup all fcoe ddp context resources
 * @adapter: ixgbe adapter
 *
 * Sets up ddp context resources
 *
 * Returns : 0 indicates success or -EINVAL on failure
 */
int ixgbe_setup_fcoe_ddp_resources(struct ixgbe_adapter *adapter)
{
        struct ixgbe_fcoe *fcoe = &adapter->fcoe;
        struct device *dev = &adapter->pdev->dev;
        void *buffer;
        dma_addr_t dma;
        unsigned int cpu;

        /* do nothing if no DDP pools were allocated */
        if (!fcoe->ddp_pool)
                return 0;

        /* Extra buffer to be shared by all DDPs for HW work around */
        buffer = kmalloc(IXGBE_FCBUFF_MIN, GFP_KERNEL);
        if (!buffer)
                return -ENOMEM;

        dma = dma_map_single(dev, buffer, IXGBE_FCBUFF_MIN, DMA_FROM_DEVICE);
        if (dma_mapping_error(dev, dma)) {
                e_err(drv, "failed to map extra DDP buffer\n");
                kfree(buffer);
                return -ENOMEM;
        }

        fcoe->extra_ddp_buffer = buffer;
        fcoe->extra_ddp_buffer_dma = dma;

        /* allocate pci pool for each cpu */
        for_each_possible_cpu(cpu) {
                int err = ixgbe_fcoe_dma_pool_alloc(fcoe, dev, cpu);
                if (!err)
                        continue;

                e_err(drv, "failed to alloc DDP pool on cpu:%d\n", cpu);
                ixgbe_free_fcoe_ddp_resources(adapter);
                return -ENOMEM;
        }

        return 0;
}

static int ixgbe_fcoe_ddp_enable(struct ixgbe_adapter *adapter)
{
        struct ixgbe_fcoe *fcoe = &adapter->fcoe;

        if (!(adapter->flags & IXGBE_FLAG_FCOE_CAPABLE))
                return -EINVAL;

        fcoe->ddp_pool = alloc_percpu(struct ixgbe_fcoe_ddp_pool);

        if (!fcoe->ddp_pool) {
                e_err(drv, "failed to allocate percpu DDP resources\n");
                return -ENOMEM;
        }

        adapter->netdev->fcoe_ddp_xid = IXGBE_FCOE_DDP_MAX - 1;
        /* X550 has different DDP Max limit */
        if (adapter->hw.mac.type == ixgbe_mac_X550)
                adapter->netdev->fcoe_ddp_xid = IXGBE_FCOE_DDP_MAX_X550 - 1;

        return 0;
}

static void ixgbe_fcoe_ddp_disable(struct ixgbe_adapter *adapter)
{
        struct ixgbe_fcoe *fcoe = &adapter->fcoe;

        adapter->netdev->fcoe_ddp_xid = 0;

        if (!fcoe->ddp_pool)
                return;

        free_percpu(fcoe->ddp_pool);
        fcoe->ddp_pool = NULL;
}

/**
 * ixgbe_fcoe_enable - turn on FCoE offload feature
 * @netdev: the corresponding netdev
 *
 * Turns on FCoE offload feature in 82599.
 *
 * Returns : 0 indicates success or -EINVAL on failure
 */
int ixgbe_fcoe_enable(struct net_device *netdev)
{
        struct ixgbe_adapter *adapter = ixgbe_from_netdev(netdev);
        struct ixgbe_fcoe *fcoe = &adapter->fcoe;

        atomic_inc(&fcoe->refcnt);

        if (!(adapter->flags & IXGBE_FLAG_FCOE_CAPABLE))
                return -EINVAL;

        if (adapter->flags & IXGBE_FLAG_FCOE_ENABLED)
                return -EINVAL;

        e_info(drv, "Enabling FCoE offload features.\n");

        if (adapter->flags & IXGBE_FLAG_SRIOV_ENABLED)
                e_warn(probe, "Enabling FCoE on PF will disable legacy VFs\n");

        if (netif_running(netdev))
                netdev->netdev_ops->ndo_stop(netdev);

        /* Allocate per CPU memory to track DDP pools */
        ixgbe_fcoe_ddp_enable(adapter);

        /* enable FCoE and notify stack */
        adapter->flags |= IXGBE_FLAG_FCOE_ENABLED;
        netdev->fcoe_mtu = true;
        netdev_features_change(netdev);

        /* release existing queues and reallocate them */
        ixgbe_clear_interrupt_scheme(adapter);
        ixgbe_init_interrupt_scheme(adapter);

        if (netif_running(netdev))
                netdev->netdev_ops->ndo_open(netdev);

        return 0;
}

/**
 * ixgbe_fcoe_disable - turn off FCoE offload feature
 * @netdev: the corresponding netdev
 *
 * Turns off FCoE offload feature in 82599.
 *
 * Returns : 0 indicates success or -EINVAL on failure
 */
int ixgbe_fcoe_disable(struct net_device *netdev)
{
        struct ixgbe_adapter *adapter = ixgbe_from_netdev(netdev);

        if (!atomic_dec_and_test(&adapter->fcoe.refcnt))
                return -EINVAL;

        if (!(adapter->flags & IXGBE_FLAG_FCOE_ENABLED))
                return -EINVAL;

        e_info(drv, "Disabling FCoE offload features.\n");
        if (netif_running(netdev))
                netdev->netdev_ops->ndo_stop(netdev);

        /* Free per CPU memory to track DDP pools */
        ixgbe_fcoe_ddp_disable(adapter);

        /* disable FCoE and notify stack */
        adapter->flags &= ~IXGBE_FLAG_FCOE_ENABLED;
        netdev->fcoe_mtu = false;

        netdev_features_change(netdev);

        /* release existing queues and reallocate them */
        ixgbe_clear_interrupt_scheme(adapter);
        ixgbe_init_interrupt_scheme(adapter);

        if (netif_running(netdev))
                netdev->netdev_ops->ndo_open(netdev);

        return 0;
}

/**
 * ixgbe_fcoe_get_wwn - get world wide name for the node or the port
 * @netdev : ixgbe adapter
 * @wwn : the world wide name
 * @type: the type of world wide name
 *
 * Returns the node or port world wide name if both the prefix and the san
 * mac address are valid, then the wwn is formed based on the NAA-2 for
 * IEEE Extended name identifier (ref. to T10 FC-LS Spec., Sec. 15.3).
 *
 * Returns : 0 on success
 */
int ixgbe_fcoe_get_wwn(struct net_device *netdev, u64 *wwn, int type)
{
        u16 prefix = 0xffff;
        struct ixgbe_adapter *adapter = ixgbe_from_netdev(netdev);
        struct ixgbe_mac_info *mac = &adapter->hw.mac;

        switch (type) {
        case NETDEV_FCOE_WWNN:
                prefix = mac->wwnn_prefix;
                break;
        case NETDEV_FCOE_WWPN:
                prefix = mac->wwpn_prefix;
                break;
        default:
                break;
        }

        if ((prefix != 0xffff) &&
            is_valid_ether_addr(mac->san_addr)) {
                *wwn = ((u64) prefix << 48) |
                       ((u64) mac->san_addr[0] << 40) |
                       ((u64) mac->san_addr[1] << 32) |
                       ((u64) mac->san_addr[2] << 24) |
                       ((u64) mac->san_addr[3] << 16) |
                       ((u64) mac->san_addr[4] << 8)  |
                       ((u64) mac->san_addr[5]);
                return 0;
        }
        return -EINVAL;
}

/**
 * ixgbe_fcoe_get_hbainfo - get FCoE HBA information
 * @netdev : ixgbe adapter
 * @info : HBA information
 *
 * Returns ixgbe HBA information
 *
 * Returns : 0 on success
 */
int ixgbe_fcoe_get_hbainfo(struct net_device *netdev,
                           struct netdev_fcoe_hbainfo *info)
{
        struct ixgbe_adapter *adapter = ixgbe_from_netdev(netdev);
        struct ixgbe_hw *hw = &adapter->hw;
        u64 dsn;

        if (!info)
                return -EINVAL;

        /* Don't return information on unsupported devices */
        if (!(adapter->flags & IXGBE_FLAG_FCOE_ENABLED))
                return -EINVAL;

        /* Manufacturer */
        snprintf(info->manufacturer, sizeof(info->manufacturer),
                 "Intel Corporation");

        /* Serial Number */

        /* Get the PCI-e Device Serial Number Capability */
        dsn = pci_get_dsn(adapter->pdev);
        if (dsn)
                snprintf(info->serial_number, sizeof(info->serial_number),
                         "%016llX", dsn);
        else
                snprintf(info->serial_number, sizeof(info->serial_number),
                         "Unknown");

        /* Hardware Version */
        snprintf(info->hardware_version,
                 sizeof(info->hardware_version),
                 "Rev %d", hw->revision_id);
        /* Driver Name/Version */
        snprintf(info->driver_version,
                 sizeof(info->driver_version),
                 "%s v%s",
                 ixgbe_driver_name,
                 UTS_RELEASE);
        /* Firmware Version */
        strscpy(info->firmware_version, adapter->eeprom_id,
                sizeof(info->firmware_version));

        /* Model */
        if (hw->mac.type == ixgbe_mac_82599EB) {
                snprintf(info->model,
                         sizeof(info->model),
                         "Intel 82599");
        } else if (hw->mac.type == ixgbe_mac_X550) {
                snprintf(info->model,
                         sizeof(info->model),
                         "Intel X550");
        } else {
                snprintf(info->model,
                         sizeof(info->model),
                         "Intel X540");
        }

        /* Model Description */
        snprintf(info->model_description,
                 sizeof(info->model_description),
                 "%s",
                 ixgbe_default_device_descr);

        return 0;
}

/**
 * ixgbe_fcoe_get_tc - get the current TC that fcoe is mapped to
 * @adapter: pointer to the device adapter structure
 *
 * Return : TC that FCoE is mapped to
 */
u8 ixgbe_fcoe_get_tc(struct ixgbe_adapter *adapter)
{
#ifdef CONFIG_IXGBE_DCB
        return netdev_get_prio_tc_map(adapter->netdev, adapter->fcoe.up);
#else
        return 0;
#endif
}