[deliverable/linux.git] / drivers / infiniband / hw / hfi1 / verbs.c

/*
 * Copyright(c) 2015, 2016 Intel Corporation.
 *
 * This file is provided under a dual BSD/GPLv2 license.  When using or
 * redistributing this file, you may do so under either license.
 *
 * GPL LICENSE SUMMARY
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of version 2 of the GNU General Public License as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * BSD LICENSE
 *
 * 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.
 *  - Neither the name of Intel Corporation nor the names of its
 *    contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 */

#include <rdma/ib_mad.h>
#include <rdma/ib_user_verbs.h>
#include <linux/io.h>
#include <linux/module.h>
#include <linux/utsname.h>
#include <linux/rculist.h>
#include <linux/mm.h>
#include <linux/vmalloc.h>

#include "hfi.h"
#include "common.h"
#include "device.h"
#include "trace.h"
#include "qp.h"
#include "verbs_txreq.h"

static unsigned int hfi1_lkey_table_size = 16;
module_param_named(lkey_table_size, hfi1_lkey_table_size, uint,
                   S_IRUGO);
MODULE_PARM_DESC(lkey_table_size,
                 "LKEY table size in bits (2^n, 1 <= n <= 23)");

static unsigned int hfi1_max_pds = 0xFFFF;
module_param_named(max_pds, hfi1_max_pds, uint, S_IRUGO);
MODULE_PARM_DESC(max_pds,
                 "Maximum number of protection domains to support");

static unsigned int hfi1_max_ahs = 0xFFFF;
module_param_named(max_ahs, hfi1_max_ahs, uint, S_IRUGO);
MODULE_PARM_DESC(max_ahs, "Maximum number of address handles to support");

unsigned int hfi1_max_cqes = 0x2FFFF;
module_param_named(max_cqes, hfi1_max_cqes, uint, S_IRUGO);
MODULE_PARM_DESC(max_cqes,
                 "Maximum number of completion queue entries to support");

unsigned int hfi1_max_cqs = 0x1FFFF;
module_param_named(max_cqs, hfi1_max_cqs, uint, S_IRUGO);
MODULE_PARM_DESC(max_cqs, "Maximum number of completion queues to support");

unsigned int hfi1_max_qp_wrs = 0x3FFF;
module_param_named(max_qp_wrs, hfi1_max_qp_wrs, uint, S_IRUGO);
MODULE_PARM_DESC(max_qp_wrs, "Maximum number of QP WRs to support");

unsigned int hfi1_max_qps = 16384;
module_param_named(max_qps, hfi1_max_qps, uint, S_IRUGO);
MODULE_PARM_DESC(max_qps, "Maximum number of QPs to support");

unsigned int hfi1_max_sges = 0x60;
module_param_named(max_sges, hfi1_max_sges, uint, S_IRUGO);
MODULE_PARM_DESC(max_sges, "Maximum number of SGEs to support");

unsigned int hfi1_max_mcast_grps = 16384;
module_param_named(max_mcast_grps, hfi1_max_mcast_grps, uint, S_IRUGO);
MODULE_PARM_DESC(max_mcast_grps,
                 "Maximum number of multicast groups to support");

unsigned int hfi1_max_mcast_qp_attached = 16;
module_param_named(max_mcast_qp_attached, hfi1_max_mcast_qp_attached,
                   uint, S_IRUGO);
MODULE_PARM_DESC(max_mcast_qp_attached,
                 "Maximum number of attached QPs to support");

unsigned int hfi1_max_srqs = 1024;
module_param_named(max_srqs, hfi1_max_srqs, uint, S_IRUGO);
MODULE_PARM_DESC(max_srqs, "Maximum number of SRQs to support");

unsigned int hfi1_max_srq_sges = 128;
module_param_named(max_srq_sges, hfi1_max_srq_sges, uint, S_IRUGO);
MODULE_PARM_DESC(max_srq_sges, "Maximum number of SRQ SGEs to support");

unsigned int hfi1_max_srq_wrs = 0x1FFFF;
module_param_named(max_srq_wrs, hfi1_max_srq_wrs, uint, S_IRUGO);
MODULE_PARM_DESC(max_srq_wrs, "Maximum number of SRQ WRs support");

unsigned short piothreshold = 256;
module_param(piothreshold, ushort, S_IRUGO);
MODULE_PARM_DESC(piothreshold, "size used to determine sdma vs. pio");

#define COPY_CACHELESS 1
#define COPY_ADAPTIVE  2
static unsigned int sge_copy_mode;
module_param(sge_copy_mode, uint, S_IRUGO);
MODULE_PARM_DESC(sge_copy_mode,
                 "Verbs copy mode: 0 use memcpy, 1 use cacheless copy, 2 adapt based on WSS");

static void verbs_sdma_complete(
        struct sdma_txreq *cookie,
        int status);

static int pio_wait(struct rvt_qp *qp,
                    struct send_context *sc,
                    struct hfi1_pkt_state *ps,
                    u32 flag);

/* Length of buffer to create verbs txreq cache name */
#define TXREQ_NAME_LEN 24

static uint wss_threshold;
module_param(wss_threshold, uint, S_IRUGO);
MODULE_PARM_DESC(wss_threshold, "Percentage (1-100) of LLC to use as a threshold for a cacheless copy");
static uint wss_clean_period = 256;
module_param(wss_clean_period, uint, S_IRUGO);
MODULE_PARM_DESC(wss_clean_period, "Count of verbs copies before an entry in the page copy table is cleaned");

/* memory working set size */
struct hfi1_wss {
        unsigned long *entries;
        atomic_t total_count;
        atomic_t clean_counter;
        atomic_t clean_entry;

        int threshold;
        int num_entries;
        long pages_mask;
};

static struct hfi1_wss wss;

int hfi1_wss_init(void)
{
        long llc_size;
        long llc_bits;
        long table_size;
        long table_bits;

        /* check for a valid percent range - default to 80 if none or invalid */
        if (wss_threshold < 1 || wss_threshold > 100)
                wss_threshold = 80;
        /* reject a wildly large period */
        if (wss_clean_period > 1000000)
                wss_clean_period = 256;
        /* reject a zero period */
        if (wss_clean_period == 0)
                wss_clean_period = 1;

        /*
         * Calculate the table size - the next power of 2 larger than the
         * LLC size.  LLC size is in KiB.
         */
        llc_size = wss_llc_size() * 1024;
        table_size = roundup_pow_of_two(llc_size);

        /* one bit per page in rounded up table */
        llc_bits = llc_size / PAGE_SIZE;
        table_bits = table_size / PAGE_SIZE;
        wss.pages_mask = table_bits - 1;
        wss.num_entries = table_bits / BITS_PER_LONG;

        wss.threshold = (llc_bits * wss_threshold) / 100;
        if (wss.threshold == 0)
                wss.threshold = 1;

        atomic_set(&wss.clean_counter, wss_clean_period);

        wss.entries = kcalloc(wss.num_entries, sizeof(*wss.entries),
                              GFP_KERNEL);
        if (!wss.entries) {
                hfi1_wss_exit();
                return -ENOMEM;
        }

        return 0;
}

void hfi1_wss_exit(void)
{
        /* coded to handle partially initialized and repeat callers */
        kfree(wss.entries);
        wss.entries = NULL;
}

/*
 * Advance the clean counter.  When the clean period has expired,
 * clean an entry.
 *
 * This is implemented in atomics to avoid locking.  Because multiple
 * variables are involved, it can be racy which can lead to slightly
 * inaccurate information.  Since this is only a heuristic, this is
 * OK.  Any innaccuracies will clean themselves out as the counter
 * advances.  That said, it is unlikely the entry clean operation will
 * race - the next possible racer will not start until the next clean
 * period.
 *
 * The clean counter is implemented as a decrement to zero.  When zero
 * is reached an entry is cleaned.
 */
static void wss_advance_clean_counter(void)
{
        int entry;
        int weight;
        unsigned long bits;

        /* become the cleaner if we decrement the counter to zero */
        if (atomic_dec_and_test(&wss.clean_counter)) {
                /*
                 * Set, not add, the clean period.  This avoids an issue
                 * where the counter could decrement below the clean period.
                 * Doing a set can result in lost decrements, slowing the
                 * clean advance.  Since this a heuristic, this possible
                 * slowdown is OK.
                 *
                 * An alternative is to loop, advancing the counter by a
                 * clean period until the result is > 0. However, this could
                 * lead to several threads keeping another in the clean loop.
                 * This could be mitigated by limiting the number of times
                 * we stay in the loop.
                 */
                atomic_set(&wss.clean_counter, wss_clean_period);

                /*
                 * Uniquely grab the entry to clean and move to next.
                 * The current entry is always the lower bits of
                 * wss.clean_entry.  The table size, wss.num_entries,
                 * is always a power-of-2.
                 */
                entry = (atomic_inc_return(&wss.clean_entry) - 1)
                        & (wss.num_entries - 1);

                /* clear the entry and count the bits */
                bits = xchg(&wss.entries[entry], 0);
                weight = hweight64((u64)bits);
                /* only adjust the contended total count if needed */
                if (weight)
                        atomic_sub(weight, &wss.total_count);
        }
}

/*
 * Insert the given address into the working set array.
 */
static void wss_insert(void *address)
{
        u32 page = ((unsigned long)address >> PAGE_SHIFT) & wss.pages_mask;
        u32 entry = page / BITS_PER_LONG; /* assumes this ends up a shift */
        u32 nr = page & (BITS_PER_LONG - 1);

        if (!test_and_set_bit(nr, &wss.entries[entry]))
                atomic_inc(&wss.total_count);

        wss_advance_clean_counter();
}

/*
 * Is the working set larger than the threshold?
 */
static inline int wss_exceeds_threshold(void)
{
        return atomic_read(&wss.total_count) >= wss.threshold;
}

/*
 * Translate ib_wr_opcode into ib_wc_opcode.
 */
const enum ib_wc_opcode ib_hfi1_wc_opcode[] = {
        [IB_WR_RDMA_WRITE] = IB_WC_RDMA_WRITE,
        [IB_WR_RDMA_WRITE_WITH_IMM] = IB_WC_RDMA_WRITE,
        [IB_WR_SEND] = IB_WC_SEND,
        [IB_WR_SEND_WITH_IMM] = IB_WC_SEND,
        [IB_WR_RDMA_READ] = IB_WC_RDMA_READ,
        [IB_WR_ATOMIC_CMP_AND_SWP] = IB_WC_COMP_SWAP,
        [IB_WR_ATOMIC_FETCH_AND_ADD] = IB_WC_FETCH_ADD,
        [IB_WR_SEND_WITH_INV] = IB_WC_SEND,
        [IB_WR_LOCAL_INV] = IB_WC_LOCAL_INV,
        [IB_WR_REG_MR] = IB_WC_REG_MR
};

/*
 * Length of header by opcode, 0 --> not supported
 */
const u8 hdr_len_by_opcode[256] = {
        /* RC */
        [IB_OPCODE_RC_SEND_FIRST]                     = 12 + 8,
        [IB_OPCODE_RC_SEND_MIDDLE]                    = 12 + 8,
        [IB_OPCODE_RC_SEND_LAST]                      = 12 + 8,
        [IB_OPCODE_RC_SEND_LAST_WITH_IMMEDIATE]       = 12 + 8 + 4,
        [IB_OPCODE_RC_SEND_ONLY]                      = 12 + 8,
        [IB_OPCODE_RC_SEND_ONLY_WITH_IMMEDIATE]       = 12 + 8 + 4,
        [IB_OPCODE_RC_RDMA_WRITE_FIRST]               = 12 + 8 + 16,
        [IB_OPCODE_RC_RDMA_WRITE_MIDDLE]              = 12 + 8,
        [IB_OPCODE_RC_RDMA_WRITE_LAST]                = 12 + 8,
        [IB_OPCODE_RC_RDMA_WRITE_LAST_WITH_IMMEDIATE] = 12 + 8 + 4,
        [IB_OPCODE_RC_RDMA_WRITE_ONLY]                = 12 + 8 + 16,
        [IB_OPCODE_RC_RDMA_WRITE_ONLY_WITH_IMMEDIATE] = 12 + 8 + 20,
        [IB_OPCODE_RC_RDMA_READ_REQUEST]              = 12 + 8 + 16,
        [IB_OPCODE_RC_RDMA_READ_RESPONSE_FIRST]       = 12 + 8 + 4,
        [IB_OPCODE_RC_RDMA_READ_RESPONSE_MIDDLE]      = 12 + 8,
        [IB_OPCODE_RC_RDMA_READ_RESPONSE_LAST]        = 12 + 8 + 4,
        [IB_OPCODE_RC_RDMA_READ_RESPONSE_ONLY]        = 12 + 8 + 4,
        [IB_OPCODE_RC_ACKNOWLEDGE]                    = 12 + 8 + 4,
        [IB_OPCODE_RC_ATOMIC_ACKNOWLEDGE]             = 12 + 8 + 4,
        [IB_OPCODE_RC_COMPARE_SWAP]                   = 12 + 8 + 28,
        [IB_OPCODE_RC_FETCH_ADD]                      = 12 + 8 + 28,
        [IB_OPCODE_RC_SEND_LAST_WITH_INVALIDATE]      = 12 + 8 + 4,
        [IB_OPCODE_RC_SEND_ONLY_WITH_INVALIDATE]      = 12 + 8 + 4,
        /* UC */
        [IB_OPCODE_UC_SEND_FIRST]                     = 12 + 8,
        [IB_OPCODE_UC_SEND_MIDDLE]                    = 12 + 8,
        [IB_OPCODE_UC_SEND_LAST]                      = 12 + 8,
        [IB_OPCODE_UC_SEND_LAST_WITH_IMMEDIATE]       = 12 + 8 + 4,
        [IB_OPCODE_UC_SEND_ONLY]                      = 12 + 8,
        [IB_OPCODE_UC_SEND_ONLY_WITH_IMMEDIATE]       = 12 + 8 + 4,
        [IB_OPCODE_UC_RDMA_WRITE_FIRST]               = 12 + 8 + 16,
        [IB_OPCODE_UC_RDMA_WRITE_MIDDLE]              = 12 + 8,
        [IB_OPCODE_UC_RDMA_WRITE_LAST]                = 12 + 8,
        [IB_OPCODE_UC_RDMA_WRITE_LAST_WITH_IMMEDIATE] = 12 + 8 + 4,
        [IB_OPCODE_UC_RDMA_WRITE_ONLY]                = 12 + 8 + 16,
        [IB_OPCODE_UC_RDMA_WRITE_ONLY_WITH_IMMEDIATE] = 12 + 8 + 20,
        /* UD */
        [IB_OPCODE_UD_SEND_ONLY]                      = 12 + 8 + 8,
        [IB_OPCODE_UD_SEND_ONLY_WITH_IMMEDIATE]       = 12 + 8 + 12
};

static const opcode_handler opcode_handler_tbl[256] = {
        /* RC */
        [IB_OPCODE_RC_SEND_FIRST]                     = &hfi1_rc_rcv,
        [IB_OPCODE_RC_SEND_MIDDLE]                    = &hfi1_rc_rcv,
        [IB_OPCODE_RC_SEND_LAST]                      = &hfi1_rc_rcv,
        [IB_OPCODE_RC_SEND_LAST_WITH_IMMEDIATE]       = &hfi1_rc_rcv,
        [IB_OPCODE_RC_SEND_ONLY]                      = &hfi1_rc_rcv,
        [IB_OPCODE_RC_SEND_ONLY_WITH_IMMEDIATE]       = &hfi1_rc_rcv,
        [IB_OPCODE_RC_RDMA_WRITE_FIRST]               = &hfi1_rc_rcv,
        [IB_OPCODE_RC_RDMA_WRITE_MIDDLE]              = &hfi1_rc_rcv,
        [IB_OPCODE_RC_RDMA_WRITE_LAST]                = &hfi1_rc_rcv,
        [IB_OPCODE_RC_RDMA_WRITE_LAST_WITH_IMMEDIATE] = &hfi1_rc_rcv,
        [IB_OPCODE_RC_RDMA_WRITE_ONLY]                = &hfi1_rc_rcv,
        [IB_OPCODE_RC_RDMA_WRITE_ONLY_WITH_IMMEDIATE] = &hfi1_rc_rcv,
        [IB_OPCODE_RC_RDMA_READ_REQUEST]              = &hfi1_rc_rcv,
        [IB_OPCODE_RC_RDMA_READ_RESPONSE_FIRST]       = &hfi1_rc_rcv,
        [IB_OPCODE_RC_RDMA_READ_RESPONSE_MIDDLE]      = &hfi1_rc_rcv,
        [IB_OPCODE_RC_RDMA_READ_RESPONSE_LAST]        = &hfi1_rc_rcv,
        [IB_OPCODE_RC_RDMA_READ_RESPONSE_ONLY]        = &hfi1_rc_rcv,
        [IB_OPCODE_RC_ACKNOWLEDGE]                    = &hfi1_rc_rcv,
        [IB_OPCODE_RC_ATOMIC_ACKNOWLEDGE]             = &hfi1_rc_rcv,
        [IB_OPCODE_RC_COMPARE_SWAP]                   = &hfi1_rc_rcv,
        [IB_OPCODE_RC_FETCH_ADD]                      = &hfi1_rc_rcv,
        [IB_OPCODE_RC_SEND_LAST_WITH_INVALIDATE]      = &hfi1_rc_rcv,
        [IB_OPCODE_RC_SEND_ONLY_WITH_INVALIDATE]      = &hfi1_rc_rcv,
        /* UC */
        [IB_OPCODE_UC_SEND_FIRST]                     = &hfi1_uc_rcv,
        [IB_OPCODE_UC_SEND_MIDDLE]                    = &hfi1_uc_rcv,
        [IB_OPCODE_UC_SEND_LAST]                      = &hfi1_uc_rcv,
        [IB_OPCODE_UC_SEND_LAST_WITH_IMMEDIATE]       = &hfi1_uc_rcv,
        [IB_OPCODE_UC_SEND_ONLY]                      = &hfi1_uc_rcv,
        [IB_OPCODE_UC_SEND_ONLY_WITH_IMMEDIATE]       = &hfi1_uc_rcv,
        [IB_OPCODE_UC_RDMA_WRITE_FIRST]               = &hfi1_uc_rcv,
        [IB_OPCODE_UC_RDMA_WRITE_MIDDLE]              = &hfi1_uc_rcv,
        [IB_OPCODE_UC_RDMA_WRITE_LAST]                = &hfi1_uc_rcv,
        [IB_OPCODE_UC_RDMA_WRITE_LAST_WITH_IMMEDIATE] = &hfi1_uc_rcv,
        [IB_OPCODE_UC_RDMA_WRITE_ONLY]                = &hfi1_uc_rcv,
        [IB_OPCODE_UC_RDMA_WRITE_ONLY_WITH_IMMEDIATE] = &hfi1_uc_rcv,
        /* UD */
        [IB_OPCODE_UD_SEND_ONLY]                      = &hfi1_ud_rcv,
        [IB_OPCODE_UD_SEND_ONLY_WITH_IMMEDIATE]       = &hfi1_ud_rcv,
        /* CNP */
        [IB_OPCODE_CNP]                               = &hfi1_cnp_rcv
};

/*
 * System image GUID.
 */
__be64 ib_hfi1_sys_image_guid;

/**
 * hfi1_copy_sge - copy data to SGE memory
 * @ss: the SGE state
 * @data: the data to copy
 * @length: the length of the data
 * @copy_last: do a separate copy of the last 8 bytes
 */
void hfi1_copy_sge(
        struct rvt_sge_state *ss,
        void *data, u32 length,
        int release,
        int copy_last)
{
        struct rvt_sge *sge = &ss->sge;
        int in_last = 0;
        int i;
        int cacheless_copy = 0;

        if (sge_copy_mode == COPY_CACHELESS) {
                cacheless_copy = length >= PAGE_SIZE;
        } else if (sge_copy_mode == COPY_ADAPTIVE) {
                if (length >= PAGE_SIZE) {
                        /*
                         * NOTE: this *assumes*:
                         * o The first vaddr is the dest.
                         * o If multiple pages, then vaddr is sequential.
                         */
                        wss_insert(sge->vaddr);
                        if (length >= (2 * PAGE_SIZE))
                                wss_insert(sge->vaddr + PAGE_SIZE);

                        cacheless_copy = wss_exceeds_threshold();
                } else {
                        wss_advance_clean_counter();
                }
        }
        if (copy_last) {
                if (length > 8) {
                        length -= 8;
                } else {
                        copy_last = 0;
                        in_last = 1;
                }
        }

again:
        while (length) {
                u32 len = sge->length;

                if (len > length)
                        len = length;
                if (len > sge->sge_length)
                        len = sge->sge_length;
                WARN_ON_ONCE(len == 0);
                if (unlikely(in_last)) {
                        /* enforce byte transfer ordering */
                        for (i = 0; i < len; i++)
                                ((u8 *)sge->vaddr)[i] = ((u8 *)data)[i];
                } else if (cacheless_copy) {
                        cacheless_memcpy(sge->vaddr, data, len);
                } else {
                        memcpy(sge->vaddr, data, len);
                }
                sge->vaddr += len;
                sge->length -= len;
                sge->sge_length -= len;
                if (sge->sge_length == 0) {
                        if (release)
                                rvt_put_mr(sge->mr);
                        if (--ss->num_sge)
                                *sge = *ss->sg_list++;
                } else if (sge->length == 0 && sge->mr->lkey) {
                        if (++sge->n >= RVT_SEGSZ) {
                                if (++sge->m >= sge->mr->mapsz)
                                        break;
                                sge->n = 0;
                        }
                        sge->vaddr =
                                sge->mr->map[sge->m]->segs[sge->n].vaddr;
                        sge->length =
                                sge->mr->map[sge->m]->segs[sge->n].length;
                }
                data += len;
                length -= len;
        }

        if (copy_last) {
                copy_last = 0;
                in_last = 1;
                length = 8;
                goto again;
        }
}

/**
 * hfi1_skip_sge - skip over SGE memory
 * @ss: the SGE state
 * @length: the number of bytes to skip
 */
void hfi1_skip_sge(struct rvt_sge_state *ss, u32 length, int release)
{
        struct rvt_sge *sge = &ss->sge;

        while (length) {
                u32 len = sge->length;

                if (len > length)
                        len = length;
                if (len > sge->sge_length)
                        len = sge->sge_length;
                WARN_ON_ONCE(len == 0);
                sge->vaddr += len;
                sge->length -= len;
                sge->sge_length -= len;
                if (sge->sge_length == 0) {
                        if (release)
                                rvt_put_mr(sge->mr);
                        if (--ss->num_sge)
                                *sge = *ss->sg_list++;
                } else if (sge->length == 0 && sge->mr->lkey) {
                        if (++sge->n >= RVT_SEGSZ) {
                                if (++sge->m >= sge->mr->mapsz)
                                        break;
                                sge->n = 0;
                        }
                        sge->vaddr =
                                sge->mr->map[sge->m]->segs[sge->n].vaddr;
                        sge->length =
                                sge->mr->map[sge->m]->segs[sge->n].length;
                }
                length -= len;
        }
}

/*
 * Make sure the QP is ready and able to accept the given opcode.
 */
static inline opcode_handler qp_ok(int opcode, struct hfi1_packet *packet)
{
        if (!(ib_rvt_state_ops[packet->qp->state] & RVT_PROCESS_RECV_OK))
                return NULL;
        if (((opcode & RVT_OPCODE_QP_MASK) == packet->qp->allowed_ops) ||
            (opcode == IB_OPCODE_CNP))
                return opcode_handler_tbl[opcode];

        return NULL;
}

/**
 * hfi1_ib_rcv - process an incoming packet
 * @packet: data packet information
 *
 * This is called to process an incoming packet at interrupt level.
 *
 * Tlen is the length of the header + data + CRC in bytes.
 */
void hfi1_ib_rcv(struct hfi1_packet *packet)
{
        struct hfi1_ctxtdata *rcd = packet->rcd;
        struct hfi1_ib_header *hdr = packet->hdr;
        u32 tlen = packet->tlen;
        struct hfi1_pportdata *ppd = rcd->ppd;
        struct hfi1_ibport *ibp = &ppd->ibport_data;
        struct rvt_dev_info *rdi = &ppd->dd->verbs_dev.rdi;
        opcode_handler packet_handler;
        unsigned long flags;
        u32 qp_num;
        int lnh;
        u8 opcode;
        u16 lid;

        /* Check for GRH */
        lnh = be16_to_cpu(hdr->lrh[0]) & 3;
        if (lnh == HFI1_LRH_BTH) {
                packet->ohdr = &hdr->u.oth;
        } else if (lnh == HFI1_LRH_GRH) {
                u32 vtf;

                packet->ohdr = &hdr->u.l.oth;
                if (hdr->u.l.grh.next_hdr != IB_GRH_NEXT_HDR)
                        goto drop;
                vtf = be32_to_cpu(hdr->u.l.grh.version_tclass_flow);
                if ((vtf >> IB_GRH_VERSION_SHIFT) != IB_GRH_VERSION)
                        goto drop;
                packet->rcv_flags |= HFI1_HAS_GRH;
        } else {
                goto drop;
        }

        trace_input_ibhdr(rcd->dd, hdr);

        opcode = (be32_to_cpu(packet->ohdr->bth[0]) >> 24);
        inc_opstats(tlen, &rcd->opstats->stats[opcode]);

        /* Get the destination QP number. */
        qp_num = be32_to_cpu(packet->ohdr->bth[1]) & RVT_QPN_MASK;
        lid = be16_to_cpu(hdr->lrh[1]);
        if (unlikely((lid >= be16_to_cpu(IB_MULTICAST_LID_BASE)) &&
                     (lid != be16_to_cpu(IB_LID_PERMISSIVE)))) {
                struct rvt_mcast *mcast;
                struct rvt_mcast_qp *p;

                if (lnh != HFI1_LRH_GRH)
                        goto drop;
                mcast = rvt_mcast_find(&ibp->rvp, &hdr->u.l.grh.dgid);
                if (!mcast)
                        goto drop;
                list_for_each_entry_rcu(p, &mcast->qp_list, list) {
                        packet->qp = p->qp;
                        spin_lock_irqsave(&packet->qp->r_lock, flags);
                        packet_handler = qp_ok(opcode, packet);
                        if (likely(packet_handler))
                                packet_handler(packet);
                        else
                                ibp->rvp.n_pkt_drops++;
                        spin_unlock_irqrestore(&packet->qp->r_lock, flags);
                }
                /*
                 * Notify rvt_multicast_detach() if it is waiting for us
                 * to finish.
                 */
                if (atomic_dec_return(&mcast->refcount) <= 1)
                        wake_up(&mcast->wait);
        } else {
                rcu_read_lock();
                packet->qp = rvt_lookup_qpn(rdi, &ibp->rvp, qp_num);
                if (!packet->qp) {
                        rcu_read_unlock();
                        goto drop;
                }
                spin_lock_irqsave(&packet->qp->r_lock, flags);
                packet_handler = qp_ok(opcode, packet);
                if (likely(packet_handler))
                        packet_handler(packet);
                else
                        ibp->rvp.n_pkt_drops++;
                spin_unlock_irqrestore(&packet->qp->r_lock, flags);
                rcu_read_unlock();
        }
        return;

drop:
        ibp->rvp.n_pkt_drops++;
}

/*
 * This is called from a timer to check for QPs
 * which need kernel memory in order to send a packet.
 */
static void mem_timer(unsigned long data)
{
        struct hfi1_ibdev *dev = (struct hfi1_ibdev *)data;
        struct list_head *list = &dev->memwait;
        struct rvt_qp *qp = NULL;
        struct iowait *wait;
        unsigned long flags;
        struct hfi1_qp_priv *priv;

        write_seqlock_irqsave(&dev->iowait_lock, flags);
        if (!list_empty(list)) {
                wait = list_first_entry(list, struct iowait, list);
                qp = iowait_to_qp(wait);
                priv = qp->priv;
                list_del_init(&priv->s_iowait.list);
                /* refcount held until actual wake up */
                if (!list_empty(list))
                        mod_timer(&dev->mem_timer, jiffies + 1);
        }
        write_sequnlock_irqrestore(&dev->iowait_lock, flags);

        if (qp)
                hfi1_qp_wakeup(qp, RVT_S_WAIT_KMEM);
}

void update_sge(struct rvt_sge_state *ss, u32 length)
{
        struct rvt_sge *sge = &ss->sge;

        sge->vaddr += length;
        sge->length -= length;
        sge->sge_length -= length;
        if (sge->sge_length == 0) {
                if (--ss->num_sge)
                        *sge = *ss->sg_list++;
        } else if (sge->length == 0 && sge->mr->lkey) {
                if (++sge->n >= RVT_SEGSZ) {
                        if (++sge->m >= sge->mr->mapsz)
                                return;
                        sge->n = 0;
                }
                sge->vaddr = sge->mr->map[sge->m]->segs[sge->n].vaddr;
                sge->length = sge->mr->map[sge->m]->segs[sge->n].length;
        }
}

/*
 * This is called with progress side lock held.
 */
/* New API */
static void verbs_sdma_complete(
        struct sdma_txreq *cookie,
        int status)
{
        struct verbs_txreq *tx =
                container_of(cookie, struct verbs_txreq, txreq);
        struct rvt_qp *qp = tx->qp;

        spin_lock(&qp->s_lock);
        if (tx->wqe) {
                hfi1_send_complete(qp, tx->wqe, IB_WC_SUCCESS);
        } else if (qp->ibqp.qp_type == IB_QPT_RC) {
                struct hfi1_ib_header *hdr;

                hdr = &tx->phdr.hdr;
                hfi1_rc_send_complete(qp, hdr);
        }
        spin_unlock(&qp->s_lock);

        hfi1_put_txreq(tx);
}

static int wait_kmem(struct hfi1_ibdev *dev,
                     struct rvt_qp *qp,
                     struct hfi1_pkt_state *ps)
{
        struct hfi1_qp_priv *priv = qp->priv;
        unsigned long flags;
        int ret = 0;

        spin_lock_irqsave(&qp->s_lock, flags);
        if (ib_rvt_state_ops[qp->state] & RVT_PROCESS_RECV_OK) {
                write_seqlock(&dev->iowait_lock);
                list_add_tail(&ps->s_txreq->txreq.list,
                              &priv->s_iowait.tx_head);
                if (list_empty(&priv->s_iowait.list)) {
                        if (list_empty(&dev->memwait))
                                mod_timer(&dev->mem_timer, jiffies + 1);
                        qp->s_flags |= RVT_S_WAIT_KMEM;
                        list_add_tail(&priv->s_iowait.list, &dev->memwait);
                        trace_hfi1_qpsleep(qp, RVT_S_WAIT_KMEM);
                        atomic_inc(&qp->refcount);
                }
                write_sequnlock(&dev->iowait_lock);
                qp->s_flags &= ~RVT_S_BUSY;
                ret = -EBUSY;
        }
        spin_unlock_irqrestore(&qp->s_lock, flags);

        return ret;
}

/*
 * This routine calls txadds for each sg entry.
 *
 * Add failures will revert the sge cursor
 */
static noinline int build_verbs_ulp_payload(
        struct sdma_engine *sde,
        struct rvt_sge_state *ss,
        u32 length,
        struct verbs_txreq *tx)
{
        struct rvt_sge *sg_list = ss->sg_list;
        struct rvt_sge sge = ss->sge;
        u8 num_sge = ss->num_sge;
        u32 len;
        int ret = 0;

        while (length) {
                len = ss->sge.length;
                if (len > length)
                        len = length;
                if (len > ss->sge.sge_length)
                        len = ss->sge.sge_length;
                WARN_ON_ONCE(len == 0);
                ret = sdma_txadd_kvaddr(
                        sde->dd,
                        &tx->txreq,
                        ss->sge.vaddr,
                        len);
                if (ret)
                        goto bail_txadd;
                update_sge(ss, len);
                length -= len;
        }
        return ret;
bail_txadd:
        /* unwind cursor */
        ss->sge = sge;
        ss->num_sge = num_sge;
        ss->sg_list = sg_list;
        return ret;
}

/*
 * Build the number of DMA descriptors needed to send length bytes of data.
 *
 * NOTE: DMA mapping is held in the tx until completed in the ring or
 *       the tx desc is freed without having been submitted to the ring
 *
 * This routine ensures all the helper routine calls succeed.
 */
/* New API */
static int build_verbs_tx_desc(
        struct sdma_engine *sde,
        struct rvt_sge_state *ss,
        u32 length,
        struct verbs_txreq *tx,
        struct hfi1_ahg_info *ahg_info,
        u64 pbc)
{
        int ret = 0;
        struct hfi1_sdma_header *phdr = &tx->phdr;
        u16 hdrbytes = tx->hdr_dwords << 2;

        if (!ahg_info->ahgcount) {
                ret = sdma_txinit_ahg(
                        &tx->txreq,
                        ahg_info->tx_flags,
                        hdrbytes + length,
                        ahg_info->ahgidx,
                        0,
                        NULL,
                        0,
                        verbs_sdma_complete);
                if (ret)
                        goto bail_txadd;
                phdr->pbc = cpu_to_le64(pbc);
                ret = sdma_txadd_kvaddr(
                        sde->dd,
                        &tx->txreq,
                        phdr,
                        hdrbytes);
                if (ret)
                        goto bail_txadd;
        } else {
                ret = sdma_txinit_ahg(
                        &tx->txreq,
                        ahg_info->tx_flags,
                        length,
                        ahg_info->ahgidx,
                        ahg_info->ahgcount,
                        ahg_info->ahgdesc,
                        hdrbytes,
                        verbs_sdma_complete);
                if (ret)
                        goto bail_txadd;
        }

        /* add the ulp payload - if any.  ss can be NULL for acks */
        if (ss)
                ret = build_verbs_ulp_payload(sde, ss, length, tx);
bail_txadd:
        return ret;
}

int hfi1_verbs_send_dma(struct rvt_qp *qp, struct hfi1_pkt_state *ps,
                        u64 pbc)
{
        struct hfi1_qp_priv *priv = qp->priv;
        struct hfi1_ahg_info *ahg_info = priv->s_ahg;
        u32 hdrwords = qp->s_hdrwords;
        struct rvt_sge_state *ss = qp->s_cur_sge;
        u32 len = qp->s_cur_size;
        u32 plen = hdrwords + ((len + 3) >> 2) + 2; /* includes pbc */
        struct hfi1_ibdev *dev = ps->dev;
        struct hfi1_pportdata *ppd = ps->ppd;
        struct verbs_txreq *tx;
        u64 pbc_flags = 0;
        u8 sc5 = priv->s_sc;

        int ret;

        tx = ps->s_txreq;
        if (!sdma_txreq_built(&tx->txreq)) {
                if (likely(pbc == 0)) {
                        u32 vl = sc_to_vlt(dd_from_ibdev(qp->ibqp.device), sc5);
                        /* No vl15 here */
                        /* set PBC_DC_INFO bit (aka SC[4]) in pbc_flags */
                        pbc_flags |= (!!(sc5 & 0x10)) << PBC_DC_INFO_SHIFT;

                        pbc = create_pbc(ppd,
                                         pbc_flags,
                                         qp->srate_mbps,
                                         vl,
                                         plen);
                }
                tx->wqe = qp->s_wqe;
                ret = build_verbs_tx_desc(tx->sde, ss, len, tx, ahg_info, pbc);
                if (unlikely(ret))
                        goto bail_build;
        }
        ret =  sdma_send_txreq(tx->sde, &priv->s_iowait, &tx->txreq);
        if (unlikely(ret < 0)) {
                if (ret == -ECOMM)
                        goto bail_ecomm;
                return ret;
        }
        trace_sdma_output_ibhdr(dd_from_ibdev(qp->ibqp.device),
                                &ps->s_txreq->phdr.hdr);
        return ret;

bail_ecomm:
        /* The current one got "sent" */
        return 0;
bail_build:
        ret = wait_kmem(dev, qp, ps);
        if (!ret) {
                /* free txreq - bad state */
                hfi1_put_txreq(ps->s_txreq);
                ps->s_txreq = NULL;
        }
        return ret;
}

/*
 * If we are now in the error state, return zero to flush the
 * send work request.
 */
static int pio_wait(struct rvt_qp *qp,
                    struct send_context *sc,
                    struct hfi1_pkt_state *ps,
                    u32 flag)
{
        struct hfi1_qp_priv *priv = qp->priv;
        struct hfi1_devdata *dd = sc->dd;
        struct hfi1_ibdev *dev = &dd->verbs_dev;
        unsigned long flags;
        int ret = 0;

        /*
         * Note that as soon as want_buffer() is called and
         * possibly before it returns, sc_piobufavail()
         * could be called. Therefore, put QP on the I/O wait list before
         * enabling the PIO avail interrupt.
         */
        spin_lock_irqsave(&qp->s_lock, flags);
        if (ib_rvt_state_ops[qp->state] & RVT_PROCESS_RECV_OK) {
                write_seqlock(&dev->iowait_lock);
                list_add_tail(&ps->s_txreq->txreq.list,
                              &priv->s_iowait.tx_head);
                if (list_empty(&priv->s_iowait.list)) {
                        struct hfi1_ibdev *dev = &dd->verbs_dev;
                        int was_empty;

                        dev->n_piowait += !!(flag & RVT_S_WAIT_PIO);
                        dev->n_piodrain += !!(flag & RVT_S_WAIT_PIO_DRAIN);
                        qp->s_flags |= flag;
                        was_empty = list_empty(&sc->piowait);
                        list_add_tail(&priv->s_iowait.list, &sc->piowait);
                        trace_hfi1_qpsleep(qp, RVT_S_WAIT_PIO);
                        atomic_inc(&qp->refcount);
                        /* counting: only call wantpiobuf_intr if first user */
                        if (was_empty)
                                hfi1_sc_wantpiobuf_intr(sc, 1);
                }
                write_sequnlock(&dev->iowait_lock);
                qp->s_flags &= ~RVT_S_BUSY;
                ret = -EBUSY;
        }
        spin_unlock_irqrestore(&qp->s_lock, flags);
        return ret;
}

static void verbs_pio_complete(void *arg, int code)
{
        struct rvt_qp *qp = (struct rvt_qp *)arg;
        struct hfi1_qp_priv *priv = qp->priv;

        if (iowait_pio_dec(&priv->s_iowait))
                iowait_drain_wakeup(&priv->s_iowait);
}

int hfi1_verbs_send_pio(struct rvt_qp *qp, struct hfi1_pkt_state *ps,
                        u64 pbc)
{
        struct hfi1_qp_priv *priv = qp->priv;
        u32 hdrwords = qp->s_hdrwords;
        struct rvt_sge_state *ss = qp->s_cur_sge;
        u32 len = qp->s_cur_size;
        u32 dwords = (len + 3) >> 2;
        u32 plen = hdrwords + dwords + 2; /* includes pbc */
        struct hfi1_pportdata *ppd = ps->ppd;
        u32 *hdr = (u32 *)&ps->s_txreq->phdr.hdr;
        u64 pbc_flags = 0;
        u8 sc5;
        unsigned long flags = 0;
        struct send_context *sc;
        struct pio_buf *pbuf;
        int wc_status = IB_WC_SUCCESS;
        int ret = 0;
        pio_release_cb cb = NULL;

        /* only RC/UC use complete */
        switch (qp->ibqp.qp_type) {
        case IB_QPT_RC:
        case IB_QPT_UC:
                cb = verbs_pio_complete;
                break;
        default:
                break;
        }

        /* vl15 special case taken care of in ud.c */
        sc5 = priv->s_sc;
        sc = ps->s_txreq->psc;

        if (likely(pbc == 0)) {
                u8 vl = sc_to_vlt(dd_from_ibdev(qp->ibqp.device), sc5);
                /* set PBC_DC_INFO bit (aka SC[4]) in pbc_flags */
                pbc_flags |= (!!(sc5 & 0x10)) << PBC_DC_INFO_SHIFT;
                pbc = create_pbc(ppd, pbc_flags, qp->srate_mbps, vl, plen);
        }
        if (cb)
                iowait_pio_inc(&priv->s_iowait);
        pbuf = sc_buffer_alloc(sc, plen, cb, qp);
        if (unlikely(!pbuf)) {
                if (cb)
                        verbs_pio_complete(qp, 0);
                if (ppd->host_link_state != HLS_UP_ACTIVE) {
                        /*
                         * If we have filled the PIO buffers to capacity and are
                         * not in an active state this request is not going to
                         * go out to so just complete it with an error or else a
                         * ULP or the core may be stuck waiting.
                         */
                        hfi1_cdbg(
                                PIO,
                                "alloc failed. state not active, completing");
                        wc_status = IB_WC_GENERAL_ERR;
                        goto pio_bail;
                } else {
                        /*
                         * This is a normal occurrence. The PIO buffs are full
                         * up but we are still happily sending, well we could be
                         * so lets continue to queue the request.
                         */
                        hfi1_cdbg(PIO, "alloc failed. state active, queuing");
                        ret = pio_wait(qp, sc, ps, RVT_S_WAIT_PIO);
                        if (!ret)
                                /* txreq not queued - free */
                                goto bail;
                        /* tx consumed in wait */
                        return ret;
                }
        }

        if (len == 0) {
                pio_copy(ppd->dd, pbuf, pbc, hdr, hdrwords);
        } else {
                if (ss) {
                        seg_pio_copy_start(pbuf, pbc, hdr, hdrwords * 4);
                        while (len) {
                                void *addr = ss->sge.vaddr;
                                u32 slen = ss->sge.length;

                                if (slen > len)
                                        slen = len;
                                update_sge(ss, slen);
                                seg_pio_copy_mid(pbuf, addr, slen);
                                len -= slen;
                        }
                        seg_pio_copy_end(pbuf);
                }
        }

        trace_pio_output_ibhdr(dd_from_ibdev(qp->ibqp.device),
                               &ps->s_txreq->phdr.hdr);

pio_bail:
        if (qp->s_wqe) {
                spin_lock_irqsave(&qp->s_lock, flags);
                hfi1_send_complete(qp, qp->s_wqe, wc_status);
                spin_unlock_irqrestore(&qp->s_lock, flags);
        } else if (qp->ibqp.qp_type == IB_QPT_RC) {
                spin_lock_irqsave(&qp->s_lock, flags);
                hfi1_rc_send_complete(qp, &ps->s_txreq->phdr.hdr);
                spin_unlock_irqrestore(&qp->s_lock, flags);
        }

        ret = 0;

bail:
        hfi1_put_txreq(ps->s_txreq);
        return ret;
}

/*
 * egress_pkey_matches_entry - return 1 if the pkey matches ent (ent
 * being an entry from the partition key table), return 0
 * otherwise. Use the matching criteria for egress partition keys
 * specified in the OPAv1 spec., section 9.1l.7.
 */
static inline int egress_pkey_matches_entry(u16 pkey, u16 ent)
{
        u16 mkey = pkey & PKEY_LOW_15_MASK;
        u16 mentry = ent & PKEY_LOW_15_MASK;

        if (mkey == mentry) {
                /*
                 * If pkey[15] is set (full partition member),
                 * is bit 15 in the corresponding table element
                 * clear (limited member)?
                 */
                if (pkey & PKEY_MEMBER_MASK)
                        return !!(ent & PKEY_MEMBER_MASK);
                return 1;
        }
        return 0;
}

/**
 * egress_pkey_check - check P_KEY of a packet
 * @ppd:    Physical IB port data
 * @lrh: Local route header
 * @bth: Base transport header
 * @sc5:    SC for packet
 * @s_pkey_index: It will be used for look up optimization for kernel contexts
 * only. If it is negative value, then it means user contexts is calling this
 * function.
 *
 * It checks if hdr's pkey is valid.
 *
 * Return: 0 on success, otherwise, 1
 */
int egress_pkey_check(struct hfi1_pportdata *ppd, __be16 *lrh, __be32 *bth,
                      u8 sc5, int8_t s_pkey_index)
{
        struct hfi1_devdata *dd;
        int i;
        u16 pkey;
        int is_user_ctxt_mechanism = (s_pkey_index < 0);

        if (!(ppd->part_enforce & HFI1_PART_ENFORCE_OUT))
                return 0;

        pkey = (u16)be32_to_cpu(bth[0]);

        /* If SC15, pkey[0:14] must be 0x7fff */
        if ((sc5 == 0xf) && ((pkey & PKEY_LOW_15_MASK) != PKEY_LOW_15_MASK))
                goto bad;

        /* Is the pkey = 0x0, or 0x8000? */
        if ((pkey & PKEY_LOW_15_MASK) == 0)
                goto bad;

        /*
         * For the kernel contexts only, if a qp is passed into the function,
         * the most likely matching pkey has index qp->s_pkey_index
         */
        if (!is_user_ctxt_mechanism &&
            egress_pkey_matches_entry(pkey, ppd->pkeys[s_pkey_index])) {
                return 0;
        }

        for (i = 0; i < MAX_PKEY_VALUES; i++) {
                if (egress_pkey_matches_entry(pkey, ppd->pkeys[i]))
                        return 0;
        }
bad:
        /*
         * For the user-context mechanism, the P_KEY check would only happen
         * once per SDMA request, not once per packet.  Therefore, there's no
         * need to increment the counter for the user-context mechanism.
         */
        if (!is_user_ctxt_mechanism) {
                incr_cntr64(&ppd->port_xmit_constraint_errors);
                dd = ppd->dd;
                if (!(dd->err_info_xmit_constraint.status &
                      OPA_EI_STATUS_SMASK)) {
                        u16 slid = be16_to_cpu(lrh[3]);

                        dd->err_info_xmit_constraint.status |=
                                OPA_EI_STATUS_SMASK;
                        dd->err_info_xmit_constraint.slid = slid;
                        dd->err_info_xmit_constraint.pkey = pkey;
                }
        }
        return 1;
}

/**
 * get_send_routine - choose an egress routine
 *
 * Choose an egress routine based on QP type
 * and size
 */
static inline send_routine get_send_routine(struct rvt_qp *qp,
                                            struct verbs_txreq *tx)
{
        struct hfi1_devdata *dd = dd_from_ibdev(qp->ibqp.device);
        struct hfi1_qp_priv *priv = qp->priv;
        struct hfi1_ib_header *h = &tx->phdr.hdr;

        if (unlikely(!(dd->flags & HFI1_HAS_SEND_DMA)))
                return dd->process_pio_send;
        switch (qp->ibqp.qp_type) {
        case IB_QPT_SMI:
                return dd->process_pio_send;
        case IB_QPT_GSI:
        case IB_QPT_UD:
                break;
        case IB_QPT_RC:
                if (piothreshold &&
                    qp->s_cur_size <= min(piothreshold, qp->pmtu) &&
                    (BIT(get_opcode(h) & 0x1f) & rc_only_opcode) &&
                    iowait_sdma_pending(&priv->s_iowait) == 0 &&
                    !sdma_txreq_built(&tx->txreq))
                        return dd->process_pio_send;
                break;
        case IB_QPT_UC:
                if (piothreshold &&
                    qp->s_cur_size <= min(piothreshold, qp->pmtu) &&
                    (BIT(get_opcode(h) & 0x1f) & uc_only_opcode) &&
                    iowait_sdma_pending(&priv->s_iowait) == 0 &&
                    !sdma_txreq_built(&tx->txreq))
                        return dd->process_pio_send;
                break;
        default:
                break;
        }
        return dd->process_dma_send;
}

/**
 * hfi1_verbs_send - send a packet
 * @qp: the QP to send on
 * @ps: the state of the packet to send
 *
 * Return zero if packet is sent or queued OK.
 * Return non-zero and clear qp->s_flags RVT_S_BUSY otherwise.
 */
int hfi1_verbs_send(struct rvt_qp *qp, struct hfi1_pkt_state *ps)
{
        struct hfi1_devdata *dd = dd_from_ibdev(qp->ibqp.device);
        struct hfi1_qp_priv *priv = qp->priv;
        struct hfi1_other_headers *ohdr;
        struct hfi1_ib_header *hdr;
        send_routine sr;
        int ret;
        u8 lnh;

        hdr = &ps->s_txreq->phdr.hdr;
        /* locate the pkey within the headers */
        lnh = be16_to_cpu(hdr->lrh[0]) & 3;
        if (lnh == HFI1_LRH_GRH)
                ohdr = &hdr->u.l.oth;
        else
                ohdr = &hdr->u.oth;

        sr = get_send_routine(qp, ps->s_txreq);
        ret = egress_pkey_check(dd->pport,
                                hdr->lrh,
                                ohdr->bth,
                                priv->s_sc,
                                qp->s_pkey_index);
        if (unlikely(ret)) {
                /*
                 * The value we are returning here does not get propagated to
                 * the verbs caller. Thus we need to complete the request with
                 * error otherwise the caller could be sitting waiting on the
                 * completion event. Only do this for PIO. SDMA has its own
                 * mechanism for handling the errors. So for SDMA we can just
                 * return.
                 */
                if (sr == dd->process_pio_send) {
                        unsigned long flags;

                        hfi1_cdbg(PIO, "%s() Failed. Completing with err",
                                  __func__);
                        spin_lock_irqsave(&qp->s_lock, flags);
                        hfi1_send_complete(qp, qp->s_wqe, IB_WC_GENERAL_ERR);
                        spin_unlock_irqrestore(&qp->s_lock, flags);
                }
                return -EINVAL;
        }
        if (sr == dd->process_dma_send && iowait_pio_pending(&priv->s_iowait))
                return pio_wait(qp,
                                ps->s_txreq->psc,
                                ps,
                                RVT_S_WAIT_PIO_DRAIN);
        return sr(qp, ps, 0);
}

/**
 * hfi1_fill_device_attr - Fill in rvt dev info device attributes.
 * @dd: the device data structure
 */
static void hfi1_fill_device_attr(struct hfi1_devdata *dd)
{
        struct rvt_dev_info *rdi = &dd->verbs_dev.rdi;

        memset(&rdi->dparms.props, 0, sizeof(rdi->dparms.props));

        rdi->dparms.props.device_cap_flags = IB_DEVICE_BAD_PKEY_CNTR |
                        IB_DEVICE_BAD_QKEY_CNTR | IB_DEVICE_SHUTDOWN_PORT |
                        IB_DEVICE_SYS_IMAGE_GUID | IB_DEVICE_RC_RNR_NAK_GEN |
                        IB_DEVICE_PORT_ACTIVE_EVENT | IB_DEVICE_SRQ_RESIZE |
                        IB_DEVICE_MEM_MGT_EXTENSIONS;
        rdi->dparms.props.page_size_cap = PAGE_SIZE;
        rdi->dparms.props.vendor_id = dd->oui1 << 16 | dd->oui2 << 8 | dd->oui3;
        rdi->dparms.props.vendor_part_id = dd->pcidev->device;
        rdi->dparms.props.hw_ver = dd->minrev;
        rdi->dparms.props.sys_image_guid = ib_hfi1_sys_image_guid;
        rdi->dparms.props.max_mr_size = U64_MAX;
        rdi->dparms.props.max_fast_reg_page_list_len = UINT_MAX;
        rdi->dparms.props.max_qp = hfi1_max_qps;
        rdi->dparms.props.max_qp_wr = hfi1_max_qp_wrs;
        rdi->dparms.props.max_sge = hfi1_max_sges;
        rdi->dparms.props.max_sge_rd = hfi1_max_sges;
        rdi->dparms.props.max_cq = hfi1_max_cqs;
        rdi->dparms.props.max_ah = hfi1_max_ahs;
        rdi->dparms.props.max_cqe = hfi1_max_cqes;
        rdi->dparms.props.max_mr = rdi->lkey_table.max;
        rdi->dparms.props.max_fmr = rdi->lkey_table.max;
        rdi->dparms.props.max_map_per_fmr = 32767;
        rdi->dparms.props.max_pd = hfi1_max_pds;
        rdi->dparms.props.max_qp_rd_atom = HFI1_MAX_RDMA_ATOMIC;
        rdi->dparms.props.max_qp_init_rd_atom = 255;
        rdi->dparms.props.max_srq = hfi1_max_srqs;
        rdi->dparms.props.max_srq_wr = hfi1_max_srq_wrs;
        rdi->dparms.props.max_srq_sge = hfi1_max_srq_sges;
        rdi->dparms.props.atomic_cap = IB_ATOMIC_GLOB;
        rdi->dparms.props.max_pkeys = hfi1_get_npkeys(dd);
        rdi->dparms.props.max_mcast_grp = hfi1_max_mcast_grps;
        rdi->dparms.props.max_mcast_qp_attach = hfi1_max_mcast_qp_attached;
        rdi->dparms.props.max_total_mcast_qp_attach =
                                        rdi->dparms.props.max_mcast_qp_attach *
                                        rdi->dparms.props.max_mcast_grp;
}

static inline u16 opa_speed_to_ib(u16 in)
{
        u16 out = 0;

        if (in & OPA_LINK_SPEED_25G)
                out |= IB_SPEED_EDR;
        if (in & OPA_LINK_SPEED_12_5G)
                out |= IB_SPEED_FDR;

        return out;
}

/*
 * Convert a single OPA link width (no multiple flags) to an IB value.
 * A zero OPA link width means link down, which means the IB width value
 * is a don't care.
 */
static inline u16 opa_width_to_ib(u16 in)
{
        switch (in) {
        case OPA_LINK_WIDTH_1X:
        /* map 2x and 3x to 1x as they don't exist in IB */
        case OPA_LINK_WIDTH_2X:
        case OPA_LINK_WIDTH_3X:
                return IB_WIDTH_1X;
        default: /* link down or unknown, return our largest width */
        case OPA_LINK_WIDTH_4X:
                return IB_WIDTH_4X;
        }
}

static int query_port(struct rvt_dev_info *rdi, u8 port_num,
                      struct ib_port_attr *props)
{
        struct hfi1_ibdev *verbs_dev = dev_from_rdi(rdi);
        struct hfi1_devdata *dd = dd_from_dev(verbs_dev);
        struct hfi1_pportdata *ppd = &dd->pport[port_num - 1];
        u16 lid = ppd->lid;

        props->lid = lid ? lid : 0;
        props->lmc = ppd->lmc;
        /* OPA logical states match IB logical states */
        props->state = driver_lstate(ppd);
        props->phys_state = hfi1_ibphys_portstate(ppd);
        props->gid_tbl_len = HFI1_GUIDS_PER_PORT;
        props->active_width = (u8)opa_width_to_ib(ppd->link_width_active);
        /* see rate_show() in ib core/sysfs.c */
        props->active_speed = (u8)opa_speed_to_ib(ppd->link_speed_active);
        props->max_vl_num = ppd->vls_supported;

        /* Once we are a "first class" citizen and have added the OPA MTUs to
         * the core we can advertise the larger MTU enum to the ULPs, for now
         * advertise only 4K.
         *
         * Those applications which are either OPA aware or pass the MTU enum
         * from the Path Records to us will get the new 8k MTU.  Those that
         * attempt to process the MTU enum may fail in various ways.
         */
        props->max_mtu = mtu_to_enum((!valid_ib_mtu(hfi1_max_mtu) ?
                                      4096 : hfi1_max_mtu), IB_MTU_4096);
        props->active_mtu = !valid_ib_mtu(ppd->ibmtu) ? props->max_mtu :
                mtu_to_enum(ppd->ibmtu, IB_MTU_2048);

        return 0;
}

static int modify_device(struct ib_device *device,
                         int device_modify_mask,
                         struct ib_device_modify *device_modify)
{
        struct hfi1_devdata *dd = dd_from_ibdev(device);
        unsigned i;
        int ret;

        if (device_modify_mask & ~(IB_DEVICE_MODIFY_SYS_IMAGE_GUID |
                                   IB_DEVICE_MODIFY_NODE_DESC)) {
                ret = -EOPNOTSUPP;
                goto bail;
        }

        if (device_modify_mask & IB_DEVICE_MODIFY_NODE_DESC) {
                memcpy(device->node_desc, device_modify->node_desc, 64);
                for (i = 0; i < dd->num_pports; i++) {
                        struct hfi1_ibport *ibp = &dd->pport[i].ibport_data;

                        hfi1_node_desc_chg(ibp);
                }
        }

        if (device_modify_mask & IB_DEVICE_MODIFY_SYS_IMAGE_GUID) {
                ib_hfi1_sys_image_guid =
                        cpu_to_be64(device_modify->sys_image_guid);
                for (i = 0; i < dd->num_pports; i++) {
                        struct hfi1_ibport *ibp = &dd->pport[i].ibport_data;

                        hfi1_sys_guid_chg(ibp);
                }
        }

        ret = 0;

bail:
        return ret;
}

static int shut_down_port(struct rvt_dev_info *rdi, u8 port_num)
{
        struct hfi1_ibdev *verbs_dev = dev_from_rdi(rdi);
        struct hfi1_devdata *dd = dd_from_dev(verbs_dev);
        struct hfi1_pportdata *ppd = &dd->pport[port_num - 1];
        int ret;

        set_link_down_reason(ppd, OPA_LINKDOWN_REASON_UNKNOWN, 0,
                             OPA_LINKDOWN_REASON_UNKNOWN);
        ret = set_link_state(ppd, HLS_DN_DOWNDEF);
        return ret;
}

static int hfi1_get_guid_be(struct rvt_dev_info *rdi, struct rvt_ibport *rvp,
                            int guid_index, __be64 *guid)
{
        struct hfi1_ibport *ibp = container_of(rvp, struct hfi1_ibport, rvp);
        struct hfi1_pportdata *ppd = ppd_from_ibp(ibp);

        if (guid_index == 0)
                *guid = cpu_to_be64(ppd->guid);
        else if (guid_index < HFI1_GUIDS_PER_PORT)
                *guid = ibp->guids[guid_index - 1];
        else
                return -EINVAL;

        return 0;
}

/*
 * convert ah port,sl to sc
 */
u8 ah_to_sc(struct ib_device *ibdev, struct ib_ah_attr *ah)
{
        struct hfi1_ibport *ibp = to_iport(ibdev, ah->port_num);

        return ibp->sl_to_sc[ah->sl];
}

static int hfi1_check_ah(struct ib_device *ibdev, struct ib_ah_attr *ah_attr)
{
        struct hfi1_ibport *ibp;
        struct hfi1_pportdata *ppd;
        struct hfi1_devdata *dd;
        u8 sc5;

        /* test the mapping for validity */
        ibp = to_iport(ibdev, ah_attr->port_num);
        ppd = ppd_from_ibp(ibp);
        sc5 = ibp->sl_to_sc[ah_attr->sl];
        dd = dd_from_ppd(ppd);
        if (sc_to_vlt(dd, sc5) > num_vls && sc_to_vlt(dd, sc5) != 0xf)
                return -EINVAL;
        return 0;
}

static void hfi1_notify_new_ah(struct ib_device *ibdev,
                               struct ib_ah_attr *ah_attr,
                               struct rvt_ah *ah)
{
        struct hfi1_ibport *ibp;
        struct hfi1_pportdata *ppd;
        struct hfi1_devdata *dd;
        u8 sc5;

        /*
         * Do not trust reading anything from rvt_ah at this point as it is not
         * done being setup. We can however modify things which we need to set.
         */

        ibp = to_iport(ibdev, ah_attr->port_num);
        ppd = ppd_from_ibp(ibp);
        sc5 = ibp->sl_to_sc[ah->attr.sl];
        dd = dd_from_ppd(ppd);
        ah->vl = sc_to_vlt(dd, sc5);
        if (ah->vl < num_vls || ah->vl == 15)
                ah->log_pmtu = ilog2(dd->vld[ah->vl].mtu);
}

struct ib_ah *hfi1_create_qp0_ah(struct hfi1_ibport *ibp, u16 dlid)
{
        struct ib_ah_attr attr;
        struct ib_ah *ah = ERR_PTR(-EINVAL);
        struct rvt_qp *qp0;

        memset(&attr, 0, sizeof(attr));
        attr.dlid = dlid;
        attr.port_num = ppd_from_ibp(ibp)->port;
        rcu_read_lock();
        qp0 = rcu_dereference(ibp->rvp.qp[0]);
        if (qp0)
                ah = ib_create_ah(qp0->ibqp.pd, &attr);
        rcu_read_unlock();
        return ah;
}

/**
 * hfi1_get_npkeys - return the size of the PKEY table for context 0
 * @dd: the hfi1_ib device
 */
unsigned hfi1_get_npkeys(struct hfi1_devdata *dd)
{
        return ARRAY_SIZE(dd->pport[0].pkeys);
}

static void init_ibport(struct hfi1_pportdata *ppd)
{
        struct hfi1_ibport *ibp = &ppd->ibport_data;
        size_t sz = ARRAY_SIZE(ibp->sl_to_sc);
        int i;

        for (i = 0; i < sz; i++) {
                ibp->sl_to_sc[i] = i;
                ibp->sc_to_sl[i] = i;
        }

        spin_lock_init(&ibp->rvp.lock);
        /* Set the prefix to the default value (see ch. 4.1.1) */
        ibp->rvp.gid_prefix = IB_DEFAULT_GID_PREFIX;
        ibp->rvp.sm_lid = 0;
        /* Below should only set bits defined in OPA PortInfo.CapabilityMask */
        ibp->rvp.port_cap_flags = IB_PORT_AUTO_MIGR_SUP |
                IB_PORT_CAP_MASK_NOTICE_SUP;
        ibp->rvp.pma_counter_select[0] = IB_PMA_PORT_XMIT_DATA;
        ibp->rvp.pma_counter_select[1] = IB_PMA_PORT_RCV_DATA;
        ibp->rvp.pma_counter_select[2] = IB_PMA_PORT_XMIT_PKTS;
        ibp->rvp.pma_counter_select[3] = IB_PMA_PORT_RCV_PKTS;
        ibp->rvp.pma_counter_select[4] = IB_PMA_PORT_XMIT_WAIT;

        RCU_INIT_POINTER(ibp->rvp.qp[0], NULL);
        RCU_INIT_POINTER(ibp->rvp.qp[1], NULL);
}

/**
 * hfi1_register_ib_device - register our device with the infiniband core
 * @dd: the device data structure
 * Return 0 if successful, errno if unsuccessful.
 */
int hfi1_register_ib_device(struct hfi1_devdata *dd)
{
        struct hfi1_ibdev *dev = &dd->verbs_dev;
        struct ib_device *ibdev = &dev->rdi.ibdev;
        struct hfi1_pportdata *ppd = dd->pport;
        unsigned i;
        int ret;
        size_t lcpysz = IB_DEVICE_NAME_MAX;

        for (i = 0; i < dd->num_pports; i++)
                init_ibport(ppd + i);

        /* Only need to initialize non-zero fields. */

        setup_timer(&dev->mem_timer, mem_timer, (unsigned long)dev);

        seqlock_init(&dev->iowait_lock);
        INIT_LIST_HEAD(&dev->txwait);
        INIT_LIST_HEAD(&dev->memwait);

        ret = verbs_txreq_init(dev);
        if (ret)
                goto err_verbs_txreq;

        /*
         * The system image GUID is supposed to be the same for all
         * HFIs in a single system but since there can be other
         * device types in the system, we can't be sure this is unique.
         */
        if (!ib_hfi1_sys_image_guid)
                ib_hfi1_sys_image_guid = cpu_to_be64(ppd->guid);
        lcpysz = strlcpy(ibdev->name, class_name(), lcpysz);
        strlcpy(ibdev->name + lcpysz, "_%d", IB_DEVICE_NAME_MAX - lcpysz);
        ibdev->owner = THIS_MODULE;
        ibdev->node_guid = cpu_to_be64(ppd->guid);
        ibdev->phys_port_cnt = dd->num_pports;
        ibdev->dma_device = &dd->pcidev->dev;
        ibdev->modify_device = modify_device;

        /* keep process mad in the driver */
        ibdev->process_mad = hfi1_process_mad;

        strncpy(ibdev->node_desc, init_utsname()->nodename,
                sizeof(ibdev->node_desc));

        /*
         * Fill in rvt info object.
         */
        dd->verbs_dev.rdi.driver_f.port_callback = hfi1_create_port_files;
        dd->verbs_dev.rdi.driver_f.get_card_name = get_card_name;
        dd->verbs_dev.rdi.driver_f.get_pci_dev = get_pci_dev;
        dd->verbs_dev.rdi.driver_f.check_ah = hfi1_check_ah;
        dd->verbs_dev.rdi.driver_f.notify_new_ah = hfi1_notify_new_ah;
        dd->verbs_dev.rdi.driver_f.get_guid_be = hfi1_get_guid_be;
        dd->verbs_dev.rdi.driver_f.query_port_state = query_port;
        dd->verbs_dev.rdi.driver_f.shut_down_port = shut_down_port;
        dd->verbs_dev.rdi.driver_f.cap_mask_chg = hfi1_cap_mask_chg;
        /*
         * Fill in rvt info device attributes.
         */
        hfi1_fill_device_attr(dd);

        /* queue pair */
        dd->verbs_dev.rdi.dparms.qp_table_size = hfi1_qp_table_size;
        dd->verbs_dev.rdi.dparms.qpn_start = 0;
        dd->verbs_dev.rdi.dparms.qpn_inc = 1;
        dd->verbs_dev.rdi.dparms.qos_shift = dd->qos_shift;
        dd->verbs_dev.rdi.dparms.qpn_res_start = kdeth_qp << 16;
        dd->verbs_dev.rdi.dparms.qpn_res_end =
        dd->verbs_dev.rdi.dparms.qpn_res_start + 65535;
        dd->verbs_dev.rdi.dparms.max_rdma_atomic = HFI1_MAX_RDMA_ATOMIC;
        dd->verbs_dev.rdi.dparms.psn_mask = PSN_MASK;
        dd->verbs_dev.rdi.dparms.psn_shift = PSN_SHIFT;
        dd->verbs_dev.rdi.dparms.psn_modify_mask = PSN_MODIFY_MASK;
        dd->verbs_dev.rdi.dparms.core_cap_flags = RDMA_CORE_PORT_INTEL_OPA;
        dd->verbs_dev.rdi.dparms.max_mad_size = OPA_MGMT_MAD_SIZE;

        dd->verbs_dev.rdi.driver_f.qp_priv_alloc = qp_priv_alloc;
        dd->verbs_dev.rdi.driver_f.qp_priv_free = qp_priv_free;
        dd->verbs_dev.rdi.driver_f.free_all_qps = free_all_qps;
        dd->verbs_dev.rdi.driver_f.notify_qp_reset = notify_qp_reset;
        dd->verbs_dev.rdi.driver_f.do_send = hfi1_do_send;
        dd->verbs_dev.rdi.driver_f.schedule_send = hfi1_schedule_send;
        dd->verbs_dev.rdi.driver_f.schedule_send_no_lock = _hfi1_schedule_send;
        dd->verbs_dev.rdi.driver_f.get_pmtu_from_attr = get_pmtu_from_attr;
        dd->verbs_dev.rdi.driver_f.notify_error_qp = notify_error_qp;
        dd->verbs_dev.rdi.driver_f.flush_qp_waiters = flush_qp_waiters;
        dd->verbs_dev.rdi.driver_f.stop_send_queue = stop_send_queue;
        dd->verbs_dev.rdi.driver_f.quiesce_qp = quiesce_qp;
        dd->verbs_dev.rdi.driver_f.notify_error_qp = notify_error_qp;
        dd->verbs_dev.rdi.driver_f.mtu_from_qp = mtu_from_qp;
        dd->verbs_dev.rdi.driver_f.mtu_to_path_mtu = mtu_to_path_mtu;
        dd->verbs_dev.rdi.driver_f.check_modify_qp = hfi1_check_modify_qp;
        dd->verbs_dev.rdi.driver_f.modify_qp = hfi1_modify_qp;
        dd->verbs_dev.rdi.driver_f.check_send_wqe = hfi1_check_send_wqe;

        /* completeion queue */
        snprintf(dd->verbs_dev.rdi.dparms.cq_name,
                 sizeof(dd->verbs_dev.rdi.dparms.cq_name),
                 "hfi1_cq%d", dd->unit);
        dd->verbs_dev.rdi.dparms.node = dd->node;

        /* misc settings */
        dd->verbs_dev.rdi.flags = 0; /* Let rdmavt handle it all */
        dd->verbs_dev.rdi.dparms.lkey_table_size = hfi1_lkey_table_size;
        dd->verbs_dev.rdi.dparms.nports = dd->num_pports;
        dd->verbs_dev.rdi.dparms.npkeys = hfi1_get_npkeys(dd);

        /* post send table */
        dd->verbs_dev.rdi.post_parms = hfi1_post_parms;

        ppd = dd->pport;
        for (i = 0; i < dd->num_pports; i++, ppd++)
                rvt_init_port(&dd->verbs_dev.rdi,
                              &ppd->ibport_data.rvp,
                              i,
                              ppd->pkeys);

        ret = rvt_register_device(&dd->verbs_dev.rdi);
        if (ret)
                goto err_verbs_txreq;

        ret = hfi1_verbs_register_sysfs(dd);
        if (ret)
                goto err_class;

        return ret;

err_class:
        rvt_unregister_device(&dd->verbs_dev.rdi);
err_verbs_txreq:
        verbs_txreq_exit(dev);
        dd_dev_err(dd, "cannot register verbs: %d!\n", -ret);
        return ret;
}

void hfi1_unregister_ib_device(struct hfi1_devdata *dd)
{
        struct hfi1_ibdev *dev = &dd->verbs_dev;

        hfi1_verbs_unregister_sysfs(dd);

        rvt_unregister_device(&dd->verbs_dev.rdi);

        if (!list_empty(&dev->txwait))
                dd_dev_err(dd, "txwait list not empty!\n");
        if (!list_empty(&dev->memwait))
                dd_dev_err(dd, "memwait list not empty!\n");

        del_timer_sync(&dev->mem_timer);
        verbs_txreq_exit(dev);
}

void hfi1_cnp_rcv(struct hfi1_packet *packet)
{
        struct hfi1_ibport *ibp = &packet->rcd->ppd->ibport_data;
        struct hfi1_pportdata *ppd = ppd_from_ibp(ibp);
        struct hfi1_ib_header *hdr = packet->hdr;
        struct rvt_qp *qp = packet->qp;
        u32 lqpn, rqpn = 0;
        u16 rlid = 0;
        u8 sl, sc5, svc_type;

        switch (packet->qp->ibqp.qp_type) {
        case IB_QPT_UC:
                rlid = qp->remote_ah_attr.dlid;
                rqpn = qp->remote_qpn;
                svc_type = IB_CC_SVCTYPE_UC;
                break;
        case IB_QPT_RC:
                rlid = qp->remote_ah_attr.dlid;
                rqpn = qp->remote_qpn;
                svc_type = IB_CC_SVCTYPE_RC;
                break;
        case IB_QPT_SMI:
        case IB_QPT_GSI:
        case IB_QPT_UD:
                svc_type = IB_CC_SVCTYPE_UD;
                break;
        default:
                ibp->rvp.n_pkt_drops++;
                return;
        }

        sc5 = hdr2sc((struct hfi1_message_header *)hdr, packet->rhf);
        sl = ibp->sc_to_sl[sc5];
        lqpn = qp->ibqp.qp_num;

        process_becn(ppd, sl, rlid, lqpn, rqpn, svc_type);
}