/*
 * This file is part of the Chelsio T4 Ethernet driver for Linux.
 *
 * Copyright (c) 2003-2016 Chelsio Communications, Inc. All rights reserved.
 *
 * This software is available to you under a choice of one of two
 * licenses.  You may choose to be licensed under the terms of the GNU
 * General Public License (GPL) Version 2, available from the file
 * COPYING in the main directory of this source tree, or the
 * OpenIB.org BSD license below:
 *
 *     Redistribution and use in source and binary forms, with or
 *     without modification, are permitted provided that the following
 *     conditions are met:
 *
 *      - Redistributions of source code must retain the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer.
 *
 *      - Redistributions in binary form must reproduce the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer in the documentation and/or other materials
 *        provided with the distribution.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

#include "cxgb4.h"
#include "t4_regs.h"
#include "l2t.h"
#include "t4fw_api.h"
#include "cxgb4_filter.h"

static inline bool is_field_set(u32 val, u32 mask)
{
        return val || mask;
}

static inline bool unsupported(u32 conf, u32 conf_mask, u32 val, u32 mask)
{
        return !(conf & conf_mask) && is_field_set(val, mask);
}

/* Validate filter spec against configuration done on the card. */
static int validate_filter(struct net_device *dev,
                           struct ch_filter_specification *fs)
{
        struct adapter *adapter = netdev2adap(dev);
        u32 fconf, iconf;

        /* Check for unconfigured fields being used. */
        fconf = adapter->params.tp.vlan_pri_map;
        iconf = adapter->params.tp.ingress_config;

        if (unsupported(fconf, FCOE_F, fs->val.fcoe, fs->mask.fcoe) ||
            unsupported(fconf, PORT_F, fs->val.iport, fs->mask.iport) ||
            unsupported(fconf, TOS_F, fs->val.tos, fs->mask.tos) ||
            unsupported(fconf, ETHERTYPE_F, fs->val.ethtype,
                        fs->mask.ethtype) ||
            unsupported(fconf, MACMATCH_F, fs->val.macidx, fs->mask.macidx) ||
            unsupported(fconf, MPSHITTYPE_F, fs->val.matchtype,
                        fs->mask.matchtype) ||
            unsupported(fconf, FRAGMENTATION_F, fs->val.frag, fs->mask.frag) ||
            unsupported(fconf, PROTOCOL_F, fs->val.proto, fs->mask.proto) ||
            unsupported(fconf, VNIC_ID_F, fs->val.pfvf_vld,
                        fs->mask.pfvf_vld) ||
            unsupported(fconf, VNIC_ID_F, fs->val.ovlan_vld,
                        fs->mask.ovlan_vld) ||
            unsupported(fconf, VLAN_F, fs->val.ivlan_vld, fs->mask.ivlan_vld))
                return -EOPNOTSUPP;

        /* T4 inconveniently uses the same FT_VNIC_ID_W bits for both the Outer
         * VLAN Tag and PF/VF/VFvld fields based on VNIC_F being set
         * in TP_INGRESS_CONFIG.  Hense the somewhat crazy checks
         * below.  Additionally, since the T4 firmware interface also
         * carries that overlap, we need to translate any PF/VF
         * specification into that internal format below.
         */
        if (is_field_set(fs->val.pfvf_vld, fs->mask.pfvf_vld) &&
            is_field_set(fs->val.ovlan_vld, fs->mask.ovlan_vld))
                return -EOPNOTSUPP;
        if (unsupported(iconf, VNIC_F, fs->val.pfvf_vld, fs->mask.pfvf_vld) ||
            (is_field_set(fs->val.ovlan_vld, fs->mask.ovlan_vld) &&
             (iconf & VNIC_F)))
                return -EOPNOTSUPP;
        if (fs->val.pf > 0x7 || fs->val.vf > 0x7f)
                return -ERANGE;
        fs->mask.pf &= 0x7;
        fs->mask.vf &= 0x7f;

        /* If the user is requesting that the filter action loop
         * matching packets back out one of our ports, make sure that
         * the egress port is in range.
         */
        if (fs->action == FILTER_SWITCH &&
            fs->eport >= adapter->params.nports)
                return -ERANGE;

        /* Don't allow various trivially obvious bogus out-of-range values... */
        if (fs->val.iport >= adapter->params.nports)
                return -ERANGE;

        /* T4 doesn't support removing VLAN Tags for loop back filters. */
        if (is_t4(adapter->params.chip) &&
            fs->action == FILTER_SWITCH &&
            (fs->newvlan == VLAN_REMOVE ||
             fs->newvlan == VLAN_REWRITE))
                return -EOPNOTSUPP;

        return 0;
}

static int get_filter_steerq(struct net_device *dev,
                             struct ch_filter_specification *fs)
{
        struct adapter *adapter = netdev2adap(dev);
        int iq;

        /* If the user has requested steering matching Ingress Packets
         * to a specific Queue Set, we need to make sure it's in range
         * for the port and map that into the Absolute Queue ID of the
         * Queue Set's Response Queue.
         */
        if (!fs->dirsteer) {
                if (fs->iq)
                        return -EINVAL;
                iq = 0;
        } else {
                struct port_info *pi = netdev_priv(dev);

                /* If the iq id is greater than the number of qsets,
                 * then assume it is an absolute qid.
                 */
                if (fs->iq < pi->nqsets)
                        iq = adapter->sge.ethrxq[pi->first_qset +
                                                 fs->iq].rspq.abs_id;
                else
                        iq = fs->iq;
        }

        return iq;
}

static int cxgb4_set_ftid(struct tid_info *t, int fidx, int family)
{
        spin_lock_bh(&t->ftid_lock);

        if (test_bit(fidx, t->ftid_bmap)) {
                spin_unlock_bh(&t->ftid_lock);
                return -EBUSY;
        }

        if (family == PF_INET)
                __set_bit(fidx, t->ftid_bmap);
        else
                bitmap_allocate_region(t->ftid_bmap, fidx, 2);

        spin_unlock_bh(&t->ftid_lock);
        return 0;
}

static void cxgb4_clear_ftid(struct tid_info *t, int fidx, int family)
{
        spin_lock_bh(&t->ftid_lock);
        if (family == PF_INET)
                __clear_bit(fidx, t->ftid_bmap);
        else
                bitmap_release_region(t->ftid_bmap, fidx, 2);
        spin_unlock_bh(&t->ftid_lock);
}

/* Delete the filter at a specified index. */
static int del_filter_wr(struct adapter *adapter, int fidx)
{
        struct filter_entry *f = &adapter->tids.ftid_tab[fidx];
        struct fw_filter_wr *fwr;
        struct sk_buff *skb;
        unsigned int len;

        len = sizeof(*fwr);

        skb = alloc_skb(len, GFP_KERNEL);
        if (!skb)
                return -ENOMEM;

        fwr = (struct fw_filter_wr *)__skb_put(skb, len);
        t4_mk_filtdelwr(f->tid, fwr, adapter->sge.fw_evtq.abs_id);

        /* Mark the filter as "pending" and ship off the Filter Work Request.
         * When we get the Work Request Reply we'll clear the pending status.
         */
        f->pending = 1;
        t4_mgmt_tx(adapter, skb);
        return 0;
}

/* Send a Work Request to write the filter at a specified index.  We construct
 * a Firmware Filter Work Request to have the work done and put the indicated
 * filter into "pending" mode which will prevent any further actions against
 * it till we get a reply from the firmware on the completion status of the
 * request.
 */
int set_filter_wr(struct adapter *adapter, int fidx)
{
        struct filter_entry *f = &adapter->tids.ftid_tab[fidx];
        struct fw_filter_wr *fwr;
        struct sk_buff *skb;

        skb = alloc_skb(sizeof(*fwr), GFP_KERNEL);
        if (!skb)
                return -ENOMEM;

        /* If the new filter requires loopback Destination MAC and/or VLAN
         * rewriting then we need to allocate a Layer 2 Table (L2T) entry for
         * the filter.
         */
        if (f->fs.newdmac || f->fs.newvlan) {
                /* allocate L2T entry for new filter */
                f->l2t = t4_l2t_alloc_switching(adapter, f->fs.vlan,
                                                f->fs.eport, f->fs.dmac);
                if (!f->l2t) {
                        kfree_skb(skb);
                        return -ENOMEM;
                }
        }

        fwr = (struct fw_filter_wr *)__skb_put(skb, sizeof(*fwr));
        memset(fwr, 0, sizeof(*fwr));

        /* It would be nice to put most of the following in t4_hw.c but most
         * of the work is translating the cxgbtool ch_filter_specification
         * into the Work Request and the definition of that structure is
         * currently in cxgbtool.h which isn't appropriate to pull into the
         * common code.  We may eventually try to come up with a more neutral
         * filter specification structure but for now it's easiest to simply
         * put this fairly direct code in line ...
         */
        fwr->op_pkd = htonl(FW_WR_OP_V(FW_FILTER_WR));
        fwr->len16_pkd = htonl(FW_WR_LEN16_V(sizeof(*fwr) / 16));
        fwr->tid_to_iq =
                htonl(FW_FILTER_WR_TID_V(f->tid) |
                      FW_FILTER_WR_RQTYPE_V(f->fs.type) |
                      FW_FILTER_WR_NOREPLY_V(0) |
                      FW_FILTER_WR_IQ_V(f->fs.iq));
        fwr->del_filter_to_l2tix =
                htonl(FW_FILTER_WR_RPTTID_V(f->fs.rpttid) |
                      FW_FILTER_WR_DROP_V(f->fs.action == FILTER_DROP) |
                      FW_FILTER_WR_DIRSTEER_V(f->fs.dirsteer) |
                      FW_FILTER_WR_MASKHASH_V(f->fs.maskhash) |
                      FW_FILTER_WR_DIRSTEERHASH_V(f->fs.dirsteerhash) |
                      FW_FILTER_WR_LPBK_V(f->fs.action == FILTER_SWITCH) |
                      FW_FILTER_WR_DMAC_V(f->fs.newdmac) |
                      FW_FILTER_WR_SMAC_V(f->fs.newsmac) |
                      FW_FILTER_WR_INSVLAN_V(f->fs.newvlan == VLAN_INSERT ||
                                             f->fs.newvlan == VLAN_REWRITE) |
                      FW_FILTER_WR_RMVLAN_V(f->fs.newvlan == VLAN_REMOVE ||
                                            f->fs.newvlan == VLAN_REWRITE) |
                      FW_FILTER_WR_HITCNTS_V(f->fs.hitcnts) |
                      FW_FILTER_WR_TXCHAN_V(f->fs.eport) |
                      FW_FILTER_WR_PRIO_V(f->fs.prio) |
                      FW_FILTER_WR_L2TIX_V(f->l2t ? f->l2t->idx : 0));
        fwr->ethtype = htons(f->fs.val.ethtype);
        fwr->ethtypem = htons(f->fs.mask.ethtype);
        fwr->frag_to_ovlan_vldm =
                (FW_FILTER_WR_FRAG_V(f->fs.val.frag) |
                 FW_FILTER_WR_FRAGM_V(f->fs.mask.frag) |
                 FW_FILTER_WR_IVLAN_VLD_V(f->fs.val.ivlan_vld) |
                 FW_FILTER_WR_OVLAN_VLD_V(f->fs.val.ovlan_vld) |
                 FW_FILTER_WR_IVLAN_VLDM_V(f->fs.mask.ivlan_vld) |
                 FW_FILTER_WR_OVLAN_VLDM_V(f->fs.mask.ovlan_vld));
        fwr->smac_sel = 0;
        fwr->rx_chan_rx_rpl_iq =
                htons(FW_FILTER_WR_RX_CHAN_V(0) |
                      FW_FILTER_WR_RX_RPL_IQ_V(adapter->sge.fw_evtq.abs_id));
        fwr->maci_to_matchtypem =
                htonl(FW_FILTER_WR_MACI_V(f->fs.val.macidx) |
                      FW_FILTER_WR_MACIM_V(f->fs.mask.macidx) |
                      FW_FILTER_WR_FCOE_V(f->fs.val.fcoe) |
                      FW_FILTER_WR_FCOEM_V(f->fs.mask.fcoe) |
                      FW_FILTER_WR_PORT_V(f->fs.val.iport) |
                      FW_FILTER_WR_PORTM_V(f->fs.mask.iport) |
                      FW_FILTER_WR_MATCHTYPE_V(f->fs.val.matchtype) |
                      FW_FILTER_WR_MATCHTYPEM_V(f->fs.mask.matchtype));
        fwr->ptcl = f->fs.val.proto;
        fwr->ptclm = f->fs.mask.proto;
        fwr->ttyp = f->fs.val.tos;
        fwr->ttypm = f->fs.mask.tos;
        fwr->ivlan = htons(f->fs.val.ivlan);
        fwr->ivlanm = htons(f->fs.mask.ivlan);
        fwr->ovlan = htons(f->fs.val.ovlan);
        fwr->ovlanm = htons(f->fs.mask.ovlan);
        memcpy(fwr->lip, f->fs.val.lip, sizeof(fwr->lip));
        memcpy(fwr->lipm, f->fs.mask.lip, sizeof(fwr->lipm));
        memcpy(fwr->fip, f->fs.val.fip, sizeof(fwr->fip));
        memcpy(fwr->fipm, f->fs.mask.fip, sizeof(fwr->fipm));
        fwr->lp = htons(f->fs.val.lport);
        fwr->lpm = htons(f->fs.mask.lport);
        fwr->fp = htons(f->fs.val.fport);
        fwr->fpm = htons(f->fs.mask.fport);
        if (f->fs.newsmac)
                memcpy(fwr->sma, f->fs.smac, sizeof(fwr->sma));

        /* Mark the filter as "pending" and ship off the Filter Work Request.
         * When we get the Work Request Reply we'll clear the pending status.
         */
        f->pending = 1;
        set_wr_txq(skb, CPL_PRIORITY_CONTROL, f->fs.val.iport & 0x3);
        t4_ofld_send(adapter, skb);
        return 0;
}

/* Return an error number if the indicated filter isn't writable ... */
int writable_filter(struct filter_entry *f)
{
        if (f->locked)
                return -EPERM;
        if (f->pending)
                return -EBUSY;

        return 0;
}

/* Delete the filter at the specified index (if valid).  The checks for all
 * the common problems with doing this like the filter being locked, currently
 * pending in another operation, etc.
 */
int delete_filter(struct adapter *adapter, unsigned int fidx)
{
        struct filter_entry *f;
        int ret;

        if (fidx >= adapter->tids.nftids + adapter->tids.nsftids)
                return -EINVAL;

        f = &adapter->tids.ftid_tab[fidx];
        ret = writable_filter(f);
        if (ret)
                return ret;
        if (f->valid)
                return del_filter_wr(adapter, fidx);

        return 0;
}

/* Clear a filter and release any of its resources that we own.  This also
 * clears the filter's "pending" status.
 */
void clear_filter(struct adapter *adap, struct filter_entry *f)
{
        /* If the new or old filter have loopback rewriteing rules then we'll
         * need to free any existing Layer Two Table (L2T) entries of the old
         * filter rule.  The firmware will handle freeing up any Source MAC
         * Table (SMT) entries used for rewriting Source MAC Addresses in
         * loopback rules.
         */
        if (f->l2t)
                cxgb4_l2t_release(f->l2t);

        /* The zeroing of the filter rule below clears the filter valid,
         * pending, locked flags, l2t pointer, etc. so it's all we need for
         * this operation.
         */
        memset(f, 0, sizeof(*f));
}

void clear_all_filters(struct adapter *adapter)
{
        unsigned int i;

        if (adapter->tids.ftid_tab) {
                struct filter_entry *f = &adapter->tids.ftid_tab[0];
                unsigned int max_ftid = adapter->tids.nftids +
                                        adapter->tids.nsftids;

                for (i = 0; i < max_ftid; i++, f++)
                        if (f->valid || f->pending)
                                clear_filter(adapter, f);
        }
}

/* Fill up default masks for set match fields. */
static void fill_default_mask(struct ch_filter_specification *fs)
{
        unsigned int lip = 0, lip_mask = 0;
        unsigned int fip = 0, fip_mask = 0;
        unsigned int i;

        if (fs->val.iport && !fs->mask.iport)
                fs->mask.iport |= ~0;
        if (fs->val.fcoe && !fs->mask.fcoe)
                fs->mask.fcoe |= ~0;
        if (fs->val.matchtype && !fs->mask.matchtype)
                fs->mask.matchtype |= ~0;
        if (fs->val.macidx && !fs->mask.macidx)
                fs->mask.macidx |= ~0;
        if (fs->val.ethtype && !fs->mask.ethtype)
                fs->mask.ethtype |= ~0;
        if (fs->val.ivlan && !fs->mask.ivlan)
                fs->mask.ivlan |= ~0;
        if (fs->val.ovlan && !fs->mask.ovlan)
                fs->mask.ovlan |= ~0;
        if (fs->val.frag && !fs->mask.frag)
                fs->mask.frag |= ~0;
        if (fs->val.tos && !fs->mask.tos)
                fs->mask.tos |= ~0;
        if (fs->val.proto && !fs->mask.proto)
                fs->mask.proto |= ~0;

        for (i = 0; i < ARRAY_SIZE(fs->val.lip); i++) {
                lip |= fs->val.lip[i];
                lip_mask |= fs->mask.lip[i];
                fip |= fs->val.fip[i];
                fip_mask |= fs->mask.fip[i];
        }

        if (lip && !lip_mask)
                memset(fs->mask.lip, ~0, sizeof(fs->mask.lip));

        if (fip && !fip_mask)
                memset(fs->mask.fip, ~0, sizeof(fs->mask.lip));

        if (fs->val.lport && !fs->mask.lport)
                fs->mask.lport = ~0;
        if (fs->val.fport && !fs->mask.fport)
                fs->mask.fport = ~0;
}

/* Check a Chelsio Filter Request for validity, convert it into our internal
 * format and send it to the hardware.  Return 0 on success, an error number
 * otherwise.  We attach any provided filter operation context to the internal
 * filter specification in order to facilitate signaling completion of the
 * operation.
 */
int __cxgb4_set_filter(struct net_device *dev, int filter_id,
                       struct ch_filter_specification *fs,
                       struct filter_ctx *ctx)
{
        struct adapter *adapter = netdev2adap(dev);
        unsigned int max_fidx, fidx;
        struct filter_entry *f;
        u32 iconf;
        int iq, ret;

        max_fidx = adapter->tids.nftids;
        if (filter_id != (max_fidx + adapter->tids.nsftids - 1) &&
            filter_id >= max_fidx)
                return -E2BIG;

        fill_default_mask(fs);

        ret = validate_filter(dev, fs);
        if (ret)
                return ret;

        iq = get_filter_steerq(dev, fs);
        if (iq < 0)
                return iq;

        /* IPv6 filters occupy four slots and must be aligned on
         * four-slot boundaries.  IPv4 filters only occupy a single
         * slot and have no alignment requirements but writing a new
         * IPv4 filter into the middle of an existing IPv6 filter
         * requires clearing the old IPv6 filter and hence we prevent
         * insertion.
         */
        if (fs->type == 0) { /* IPv4 */
                /* If our IPv4 filter isn't being written to a
                 * multiple of four filter index and there's an IPv6
                 * filter at the multiple of 4 base slot, then we
                 * prevent insertion.
                 */
                fidx = filter_id & ~0x3;
                if (fidx != filter_id &&
                    adapter->tids.ftid_tab[fidx].fs.type) {
                        f = &adapter->tids.ftid_tab[fidx];
                        if (f->valid) {
                                dev_err(adapter->pdev_dev,
                                        "Invalid location. IPv6 requires 4 slots and is occupying slots %u to %u\n",
                                        fidx, fidx + 3);
                                return -EINVAL;
                        }
                }
        } else { /* IPv6 */
                /* Ensure that the IPv6 filter is aligned on a
                 * multiple of 4 boundary.
                 */
                if (filter_id & 0x3) {
                        dev_err(adapter->pdev_dev,
                                "Invalid location. IPv6 must be aligned on a 4-slot boundary\n");
                        return -EINVAL;
                }

                /* Check all except the base overlapping IPv4 filter slots. */
                for (fidx = filter_id + 1; fidx < filter_id + 4; fidx++) {
                        f = &adapter->tids.ftid_tab[fidx];
                        if (f->valid) {
                                dev_err(adapter->pdev_dev,
                                        "Invalid location.  IPv6 requires 4 slots and an IPv4 filter exists at %u\n",
                                        fidx);
                                return -EINVAL;
                        }
                }
        }

        /* Check to make sure that provided filter index is not
         * already in use by someone else
         */
        f = &adapter->tids.ftid_tab[filter_id];
        if (f->valid)
                return -EBUSY;

        fidx = filter_id + adapter->tids.ftid_base;
        ret = cxgb4_set_ftid(&adapter->tids, filter_id,
                             fs->type ? PF_INET6 : PF_INET);
        if (ret)
                return ret;

        /* Check to make sure the filter requested is writable ... */
        ret = writable_filter(f);
        if (ret) {
                /* Clear the bits we have set above */
                cxgb4_clear_ftid(&adapter->tids, filter_id,
                                 fs->type ? PF_INET6 : PF_INET);
                return ret;
        }

        /* Clear out any old resources being used by the filter before
         * we start constructing the new filter.
         */
        if (f->valid)
                clear_filter(adapter, f);

        /* Convert the filter specification into our internal format.
         * We copy the PF/VF specification into the Outer VLAN field
         * here so the rest of the code -- including the interface to
         * the firmware -- doesn't have to constantly do these checks.
         */
        f->fs = *fs;
        f->fs.iq = iq;
        f->dev = dev;

        iconf = adapter->params.tp.ingress_config;
        if (iconf & VNIC_F) {
                f->fs.val.ovlan = (fs->val.pf << 13) | fs->val.vf;
                f->fs.mask.ovlan = (fs->mask.pf << 13) | fs->mask.vf;
                f->fs.val.ovlan_vld = fs->val.pfvf_vld;
                f->fs.mask.ovlan_vld = fs->mask.pfvf_vld;
        }

        /* Attempt to set the filter.  If we don't succeed, we clear
         * it and return the failure.
         */
        f->ctx = ctx;
        f->tid = fidx; /* Save the actual tid */
        ret = set_filter_wr(adapter, filter_id);
        if (ret) {
                cxgb4_clear_ftid(&adapter->tids, filter_id,
                                 fs->type ? PF_INET6 : PF_INET);
                clear_filter(adapter, f);
        }

        return ret;
}

/* Check a delete filter request for validity and send it to the hardware.
 * Return 0 on success, an error number otherwise.  We attach any provided
 * filter operation context to the internal filter specification in order to
 * facilitate signaling completion of the operation.
 */
int __cxgb4_del_filter(struct net_device *dev, int filter_id,
                       struct filter_ctx *ctx)
{
        struct adapter *adapter = netdev2adap(dev);
        struct filter_entry *f;
        unsigned int max_fidx;
        int ret;

        max_fidx = adapter->tids.nftids;
        if (filter_id != (max_fidx + adapter->tids.nsftids - 1) &&
            filter_id >= max_fidx)
                return -E2BIG;

        f = &adapter->tids.ftid_tab[filter_id];
        ret = writable_filter(f);
        if (ret)
                return ret;

        if (f->valid) {
                f->ctx = ctx;
                cxgb4_clear_ftid(&adapter->tids, filter_id,
                                 f->fs.type ? PF_INET6 : PF_INET);
                return del_filter_wr(adapter, filter_id);
        }

        /* If the caller has passed in a Completion Context then we need to
         * mark it as a successful completion so they don't stall waiting
         * for it.
         */
        if (ctx) {
                ctx->result = 0;
                complete(&ctx->completion);
        }
        return ret;
}

int cxgb4_set_filter(struct net_device *dev, int filter_id,
                     struct ch_filter_specification *fs)
{
        struct filter_ctx ctx;
        int ret;

        init_completion(&ctx.completion);

        ret = __cxgb4_set_filter(dev, filter_id, fs, &ctx);
        if (ret)
                goto out;

        /* Wait for reply */
        ret = wait_for_completion_timeout(&ctx.completion, 10 * HZ);
        if (!ret)
                return -ETIMEDOUT;

        ret = ctx.result;
out:
        return ret;
}

int cxgb4_del_filter(struct net_device *dev, int filter_id)
{
        struct filter_ctx ctx;
        int ret;

        init_completion(&ctx.completion);

        ret = __cxgb4_del_filter(dev, filter_id, &ctx);
        if (ret)
                goto out;

        /* Wait for reply */
        ret = wait_for_completion_timeout(&ctx.completion, 10 * HZ);
        if (!ret)
                return -ETIMEDOUT;

        ret = ctx.result;
out:
        return ret;
}

/* Handle a filter write/deletion reply. */
void filter_rpl(struct adapter *adap, const struct cpl_set_tcb_rpl *rpl)
{
        unsigned int tid = GET_TID(rpl);
        struct filter_entry *f = NULL;
        unsigned int max_fidx;
        int idx;

        max_fidx = adap->tids.nftids + adap->tids.nsftids;
        /* Get the corresponding filter entry for this tid */
        if (adap->tids.ftid_tab) {
                /* Check this in normal filter region */
                idx = tid - adap->tids.ftid_base;
                if (idx >= max_fidx)
                        return;
                f = &adap->tids.ftid_tab[idx];
                if (f->tid != tid)
                        return;
        }

        /* We found the filter entry for this tid */
        if (f) {
                unsigned int ret = TCB_COOKIE_G(rpl->cookie);
                struct filter_ctx *ctx;

                /* Pull off any filter operation context attached to the
                 * filter.
                 */
                ctx = f->ctx;
                f->ctx = NULL;

                if (ret == FW_FILTER_WR_FLT_DELETED) {
                        /* Clear the filter when we get confirmation from the
                         * hardware that the filter has been deleted.
                         */
                        clear_filter(adap, f);
                        if (ctx)
                                ctx->result = 0;
                } else if (ret == FW_FILTER_WR_SMT_TBL_FULL) {
                        dev_err(adap->pdev_dev, "filter %u setup failed due to full SMT\n",
                                idx);
                        clear_filter(adap, f);
                        if (ctx)
                                ctx->result = -ENOMEM;
                } else if (ret == FW_FILTER_WR_FLT_ADDED) {
                        f->smtidx = (be64_to_cpu(rpl->oldval) >> 24) & 0xff;
                        f->pending = 0;  /* asynchronous setup completed */
                        f->valid = 1;
                        if (ctx) {
                                ctx->result = 0;
                                ctx->tid = idx;
                        }
                } else {
                        /* Something went wrong.  Issue a warning about the
                         * problem and clear everything out.
                         */
                        dev_err(adap->pdev_dev, "filter %u setup failed with error %u\n",
                                idx, ret);
                        clear_filter(adap, f);
                        if (ctx)
                                ctx->result = -EINVAL;
                }
                if (ctx)
                        complete(&ctx->completion);
        }
}