ehca_av.c

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/*
 *  IBM eServer eHCA Infiniband device driver for Linux on POWER
 *
 *  address vector functions
 *
 *  Authors: Hoang-Nam Nguyen <[email protected]>
 *           Khadija Souissi <[email protected]>
 *           Reinhard Ernst <[email protected]>
 *           Christoph Raisch <[email protected]>
 *
 *  Copyright (c) 2005 IBM Corporation
 *
 *  All rights reserved.
 *
 *  This source code is distributed under a dual license of GPL v2.0 and OpenIB
 *  BSD.
 *
 * OpenIB 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.
 *
 * 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 <linux/slab.h>

#include "ehca_tools.h"
#include "ehca_iverbs.h"
#include "hcp_if.h"

static struct kmem_cache *av_cache;

int ehca_calc_ipd(struct ehca_shca *shca, int port,
          enum ib_rate path_rate, u32 *ipd)
{
    int path = ib_rate_to_mult(path_rate);
    int link, ret;
    struct ib_port_attr pa;

    if (path_rate == IB_RATE_PORT_CURRENT) {
        *ipd = 0;
        return 0;
    }

    if (unlikely(path < 0)) {
        ehca_err(&shca->ib_device, "Invalid static rate! path_rate=%x",
             path_rate);
        return -EINVAL;
    }

    ret = ehca_query_port(&shca->ib_device, port, &pa);
    if (unlikely(ret < 0)) {
        ehca_err(&shca->ib_device, "Failed to query port  ret=%i", ret);
        return ret;
    }

    link = ib_width_enum_to_int(pa.active_width) * pa.active_speed;

    if (path >= link)
        /* no need to throttle if path faster than link */
        *ipd = 0;
    else
        /* IPD = round((link / path) - 1) */
        *ipd = ((link + (path >> 1)) / path) - 1;

    return 0;
}

struct ib_ah *ehca_create_ah(struct ib_pd *pd, struct ib_ah_attr *ah_attr)
{
    int ret;
    struct ehca_av *av;
    struct ehca_shca *shca = container_of(pd->device, struct ehca_shca,
                          ib_device);

    av = kmem_cache_alloc(av_cache, GFP_KERNEL);
    if (!av) {
        ehca_err(pd->device, "Out of memory pd=%p ah_attr=%p",
             pd, ah_attr);
        return ERR_PTR(-ENOMEM);
    }

    av->av.sl = ah_attr->sl;
    av->av.dlid = ah_attr->dlid;
    av->av.slid_path_bits = ah_attr->src_path_bits;

    if (ehca_static_rate < 0) {
        u32 ipd;
        if (ehca_calc_ipd(shca, ah_attr->port_num,
                  ah_attr->static_rate, &ipd)) {
            ret = -EINVAL;
            goto create_ah_exit1;
        }
        av->av.ipd = ipd;
    } else
        av->av.ipd = ehca_static_rate;

    av->av.lnh = ah_attr->ah_flags;
    av->av.grh.word_0 = EHCA_BMASK_SET(GRH_IPVERSION_MASK, 6);
    av->av.grh.word_0 |= EHCA_BMASK_SET(GRH_TCLASS_MASK,
                        ah_attr->grh.traffic_class);
    av->av.grh.word_0 |= EHCA_BMASK_SET(GRH_FLOWLABEL_MASK,
                        ah_attr->grh.flow_label);
    av->av.grh.word_0 |= EHCA_BMASK_SET(GRH_HOPLIMIT_MASK,
                        ah_attr->grh.hop_limit);
    av->av.grh.word_0 |= EHCA_BMASK_SET(GRH_NEXTHEADER_MASK, 0x1B);
    /* set sgid in grh.word_1 */
    if (ah_attr->ah_flags & IB_AH_GRH) {
        int rc;
        struct ib_port_attr port_attr;
        union ib_gid gid;
        memset(&port_attr, 0, sizeof(port_attr));
        rc = ehca_query_port(pd->device, ah_attr->port_num,
                     &port_attr);
        if (rc) { /* invalid port number */
            ret = -EINVAL;
            ehca_err(pd->device, "Invalid port number "
                 "ehca_query_port() returned %x "
                 "pd=%p ah_attr=%p", rc, pd, ah_attr);
            goto create_ah_exit1;
        }
        memset(&gid, 0, sizeof(gid));
        rc = ehca_query_gid(pd->device,
                    ah_attr->port_num,
                    ah_attr->grh.sgid_index, &gid);
        if (rc) {
            ret = -EINVAL;
            ehca_err(pd->device, "Failed to retrieve sgid "
                 "ehca_query_gid() returned %x "
                 "pd=%p ah_attr=%p", rc, pd, ah_attr);
            goto create_ah_exit1;
        }
        memcpy(&av->av.grh.word_1, &gid, sizeof(gid));
    }
    av->av.pmtu = shca->max_mtu;

    /* dgid comes in grh.word_3 */
    memcpy(&av->av.grh.word_3, &ah_attr->grh.dgid,
           sizeof(ah_attr->grh.dgid));

    return &av->ib_ah;

create_ah_exit1:
    kmem_cache_free(av_cache, av);

    return ERR_PTR(ret);
}

int ehca_modify_ah(struct ib_ah *ah, struct ib_ah_attr *ah_attr)
{
    struct ehca_av *av;
    struct ehca_ud_av new_ehca_av;
    struct ehca_shca *shca = container_of(ah->pd->device, struct ehca_shca,
                          ib_device);

    memset(&new_ehca_av, 0, sizeof(new_ehca_av));
    new_ehca_av.sl = ah_attr->sl;
    new_ehca_av.dlid = ah_attr->dlid;
    new_ehca_av.slid_path_bits = ah_attr->src_path_bits;
    new_ehca_av.ipd = ah_attr->static_rate;
    new_ehca_av.lnh = EHCA_BMASK_SET(GRH_FLAG_MASK,
                     (ah_attr->ah_flags & IB_AH_GRH) > 0);
    new_ehca_av.grh.word_0 = EHCA_BMASK_SET(GRH_TCLASS_MASK,
                        ah_attr->grh.traffic_class);
    new_ehca_av.grh.word_0 |= EHCA_BMASK_SET(GRH_FLOWLABEL_MASK,
                         ah_attr->grh.flow_label);
    new_ehca_av.grh.word_0 |= EHCA_BMASK_SET(GRH_HOPLIMIT_MASK,
                         ah_attr->grh.hop_limit);
    new_ehca_av.grh.word_0 |= EHCA_BMASK_SET(GRH_NEXTHEADER_MASK, 0x1b);

    /* set sgid in grh.word_1 */
    if (ah_attr->ah_flags & IB_AH_GRH) {
        int rc;
        struct ib_port_attr port_attr;
        union ib_gid gid;
        memset(&port_attr, 0, sizeof(port_attr));
        rc = ehca_query_port(ah->device, ah_attr->port_num,
                     &port_attr);
        if (rc) { /* invalid port number */
            ehca_err(ah->device, "Invalid port number "
                 "ehca_query_port() returned %x "
                 "ah=%p ah_attr=%p port_num=%x",
                 rc, ah, ah_attr, ah_attr->port_num);
            return -EINVAL;
        }
        memset(&gid, 0, sizeof(gid));
        rc = ehca_query_gid(ah->device,
                    ah_attr->port_num,
                    ah_attr->grh.sgid_index, &gid);
        if (rc) {
            ehca_err(ah->device, "Failed to retrieve sgid "
                 "ehca_query_gid() returned %x "
                 "ah=%p ah_attr=%p port_num=%x "
                 "sgid_index=%x",
                 rc, ah, ah_attr, ah_attr->port_num,
                 ah_attr->grh.sgid_index);
            return -EINVAL;
        }
        memcpy(&new_ehca_av.grh.word_1, &gid, sizeof(gid));
    }

    new_ehca_av.pmtu = shca->max_mtu;

    memcpy(&new_ehca_av.grh.word_3, &ah_attr->grh.dgid,
           sizeof(ah_attr->grh.dgid));

    av = container_of(ah, struct ehca_av, ib_ah);
    av->av = new_ehca_av;

    return 0;
}

int ehca_query_ah(struct ib_ah *ah, struct ib_ah_attr *ah_attr)
{
    struct ehca_av *av = container_of(ah, struct ehca_av, ib_ah);

    memcpy(&ah_attr->grh.dgid, &av->av.grh.word_3,
           sizeof(ah_attr->grh.dgid));
    ah_attr->sl = av->av.sl;

    ah_attr->dlid = av->av.dlid;

    ah_attr->src_path_bits = av->av.slid_path_bits;
    ah_attr->static_rate = av->av.ipd;
    ah_attr->ah_flags = EHCA_BMASK_GET(GRH_FLAG_MASK, av->av.lnh);
    ah_attr->grh.traffic_class = EHCA_BMASK_GET(GRH_TCLASS_MASK,
                            av->av.grh.word_0);
    ah_attr->grh.hop_limit = EHCA_BMASK_GET(GRH_HOPLIMIT_MASK,
                        av->av.grh.word_0);
    ah_attr->grh.flow_label = EHCA_BMASK_GET(GRH_FLOWLABEL_MASK,
                         av->av.grh.word_0);

    return 0;
}

int ehca_destroy_ah(struct ib_ah *ah)
{
    kmem_cache_free(av_cache, container_of(ah, struct ehca_av, ib_ah));

    return 0;
}

int ehca_init_av_cache(void)
{
    av_cache = kmem_cache_create("ehca_cache_av",
                   sizeof(struct ehca_av), 0,
                   SLAB_HWCACHE_ALIGN,
                   NULL);
    if (!av_cache)
        return -ENOMEM;
    return 0;
}

void ehca_cleanup_av_cache(void)
{
    if (av_cache)
        kmem_cache_destroy(av_cache);
}