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mthca_mcg.c

/*
 * Copyright (c) 2004 Topspin Communications.  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.
 *
 * $Id: mthca_mcg.c 1349 2004-12-16 21:09:43Z roland $
 */

#include <linux/string.h>
#include <linux/slab.h>

#include "mthca_dev.h"
#include "mthca_cmd.h"

struct mthca_mgm {
      __be32 next_gid_index;
      u32    reserved[3];
      u8     gid[16];
      __be32 qp[MTHCA_QP_PER_MGM];
};

static const u8 zero_gid[16]; /* automatically initialized to 0 */

/*
 * Caller must hold MCG table semaphore.  gid and mgm parameters must
 * be properly aligned for command interface.
 *
 *  Returns 0 unless a firmware command error occurs.
 *
 * If GID is found in MGM or MGM is empty, *index = *hash, *prev = -1
 * and *mgm holds MGM entry.
 *
 * if GID is found in AMGM, *index = index in AMGM, *prev = index of
 * previous entry in hash chain and *mgm holds AMGM entry.
 *
 * If no AMGM exists for given gid, *index = -1, *prev = index of last
 * entry in hash chain and *mgm holds end of hash chain.
 */
static int find_mgm(struct mthca_dev *dev,
                u8 *gid, struct mthca_mailbox *mgm_mailbox,
                u16 *hash, int *prev, int *index)
{
      struct mthca_mailbox *mailbox;
      struct mthca_mgm *mgm = mgm_mailbox->buf;
      u8 *mgid;
      int err;
      u8 status;

      mailbox = mthca_alloc_mailbox(dev, GFP_KERNEL);
      if (IS_ERR(mailbox))
            return -ENOMEM;
      mgid = mailbox->buf;

      memcpy(mgid, gid, 16);

      err = mthca_MGID_HASH(dev, mailbox, hash, &status);
      if (err)
            goto out;
      if (status) {
            mthca_err(dev, "MGID_HASH returned status %02x\n", status);
            err = -EINVAL;
            goto out;
      }

      if (0)
            mthca_dbg(dev, "Hash for %04x:%04x:%04x:%04x:"
                    "%04x:%04x:%04x:%04x is %04x\n",
                    be16_to_cpu(((__be16 *) gid)[0]),
                    be16_to_cpu(((__be16 *) gid)[1]),
                    be16_to_cpu(((__be16 *) gid)[2]),
                    be16_to_cpu(((__be16 *) gid)[3]),
                    be16_to_cpu(((__be16 *) gid)[4]),
                    be16_to_cpu(((__be16 *) gid)[5]),
                    be16_to_cpu(((__be16 *) gid)[6]),
                    be16_to_cpu(((__be16 *) gid)[7]),
                    *hash);

      *index = *hash;
      *prev  = -1;

      do {
            err = mthca_READ_MGM(dev, *index, mgm_mailbox, &status);
            if (err)
                  goto out;
            if (status) {
                  mthca_err(dev, "READ_MGM returned status %02x\n", status);
                  err = -EINVAL;
                  goto out;
            }

            if (!memcmp(mgm->gid, zero_gid, 16)) {
                  if (*index != *hash) {
                        mthca_err(dev, "Found zero MGID in AMGM.\n");
                        err = -EINVAL;
                  }
                  goto out;
            }

            if (!memcmp(mgm->gid, gid, 16))
                  goto out;

            *prev = *index;
            *index = be32_to_cpu(mgm->next_gid_index) >> 6;
      } while (*index);

      *index = -1;

 out:
      mthca_free_mailbox(dev, mailbox);
      return err;
}

int mthca_multicast_attach(struct ib_qp *ibqp, union ib_gid *gid, u16 lid)
{
      struct mthca_dev *dev = to_mdev(ibqp->device);
      struct mthca_mailbox *mailbox;
      struct mthca_mgm *mgm;
      u16 hash;
      int index, prev;
      int link = 0;
      int i;
      int err;
      u8 status;

      mailbox = mthca_alloc_mailbox(dev, GFP_KERNEL);
      if (IS_ERR(mailbox))
            return PTR_ERR(mailbox);
      mgm = mailbox->buf;

      mutex_lock(&dev->mcg_table.mutex);

      err = find_mgm(dev, gid->raw, mailbox, &hash, &prev, &index);
      if (err)
            goto out;

      if (index != -1) {
            if (!memcmp(mgm->gid, zero_gid, 16))
                  memcpy(mgm->gid, gid->raw, 16);
      } else {
            link = 1;

            index = mthca_alloc(&dev->mcg_table.alloc);
            if (index == -1) {
                  mthca_err(dev, "No AMGM entries left\n");
                  err = -ENOMEM;
                  goto out;
            }

            err = mthca_READ_MGM(dev, index, mailbox, &status);
            if (err)
                  goto out;
            if (status) {
                  mthca_err(dev, "READ_MGM returned status %02x\n", status);
                  err = -EINVAL;
                  goto out;
            }
            memset(mgm, 0, sizeof *mgm);
            memcpy(mgm->gid, gid->raw, 16);
      }

      for (i = 0; i < MTHCA_QP_PER_MGM; ++i)
            if (mgm->qp[i] == cpu_to_be32(ibqp->qp_num | (1 << 31))) {
                  mthca_dbg(dev, "QP %06x already a member of MGM\n",
                          ibqp->qp_num);
                  err = 0;
                  goto out;
            } else if (!(mgm->qp[i] & cpu_to_be32(1 << 31))) {
                  mgm->qp[i] = cpu_to_be32(ibqp->qp_num | (1 << 31));
                  break;
            }

      if (i == MTHCA_QP_PER_MGM) {
            mthca_err(dev, "MGM at index %x is full.\n", index);
            err = -ENOMEM;
            goto out;
      }

      err = mthca_WRITE_MGM(dev, index, mailbox, &status);
      if (err)
            goto out;
      if (status) {
            mthca_err(dev, "WRITE_MGM returned status %02x\n", status);
            err = -EINVAL;
            goto out;
      }

      if (!link)
            goto out;

      err = mthca_READ_MGM(dev, prev, mailbox, &status);
      if (err)
            goto out;
      if (status) {
            mthca_err(dev, "READ_MGM returned status %02x\n", status);
            err = -EINVAL;
            goto out;
      }

      mgm->next_gid_index = cpu_to_be32(index << 6);

      err = mthca_WRITE_MGM(dev, prev, mailbox, &status);
      if (err)
            goto out;
      if (status) {
            mthca_err(dev, "WRITE_MGM returned status %02x\n", status);
            err = -EINVAL;
      }

 out:
      if (err && link && index != -1) {
            BUG_ON(index < dev->limits.num_mgms);
            mthca_free(&dev->mcg_table.alloc, index);
      }
      mutex_unlock(&dev->mcg_table.mutex);

      mthca_free_mailbox(dev, mailbox);
      return err;
}

int mthca_multicast_detach(struct ib_qp *ibqp, union ib_gid *gid, u16 lid)
{
      struct mthca_dev *dev = to_mdev(ibqp->device);
      struct mthca_mailbox *mailbox;
      struct mthca_mgm *mgm;
      u16 hash;
      int prev, index;
      int i, loc;
      int err;
      u8 status;

      mailbox = mthca_alloc_mailbox(dev, GFP_KERNEL);
      if (IS_ERR(mailbox))
            return PTR_ERR(mailbox);
      mgm = mailbox->buf;

      mutex_lock(&dev->mcg_table.mutex);

      err = find_mgm(dev, gid->raw, mailbox, &hash, &prev, &index);
      if (err)
            goto out;

      if (index == -1) {
            mthca_err(dev, "MGID %04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x "
                    "not found\n",
                    be16_to_cpu(((__be16 *) gid->raw)[0]),
                    be16_to_cpu(((__be16 *) gid->raw)[1]),
                    be16_to_cpu(((__be16 *) gid->raw)[2]),
                    be16_to_cpu(((__be16 *) gid->raw)[3]),
                    be16_to_cpu(((__be16 *) gid->raw)[4]),
                    be16_to_cpu(((__be16 *) gid->raw)[5]),
                    be16_to_cpu(((__be16 *) gid->raw)[6]),
                    be16_to_cpu(((__be16 *) gid->raw)[7]));
            err = -EINVAL;
            goto out;
      }

      for (loc = -1, i = 0; i < MTHCA_QP_PER_MGM; ++i) {
            if (mgm->qp[i] == cpu_to_be32(ibqp->qp_num | (1 << 31)))
                  loc = i;
            if (!(mgm->qp[i] & cpu_to_be32(1 << 31)))
                  break;
      }

      if (loc == -1) {
            mthca_err(dev, "QP %06x not found in MGM\n", ibqp->qp_num);
            err = -EINVAL;
            goto out;
      }

      mgm->qp[loc]   = mgm->qp[i - 1];
      mgm->qp[i - 1] = 0;

      err = mthca_WRITE_MGM(dev, index, mailbox, &status);
      if (err)
            goto out;
      if (status) {
            mthca_err(dev, "WRITE_MGM returned status %02x\n", status);
            err = -EINVAL;
            goto out;
      }

      if (i != 1)
            goto out;

      if (prev == -1) {
            /* Remove entry from MGM */
            int amgm_index_to_free = be32_to_cpu(mgm->next_gid_index) >> 6;
            if (amgm_index_to_free) {
                  err = mthca_READ_MGM(dev, amgm_index_to_free,
                                   mailbox, &status);
                  if (err)
                        goto out;
                  if (status) {
                        mthca_err(dev, "READ_MGM returned status %02x\n",
                                status);
                        err = -EINVAL;
                        goto out;
                  }
            } else
                  memset(mgm->gid, 0, 16);

            err = mthca_WRITE_MGM(dev, index, mailbox, &status);
            if (err)
                  goto out;
            if (status) {
                  mthca_err(dev, "WRITE_MGM returned status %02x\n", status);
                  err = -EINVAL;
                  goto out;
            }
            if (amgm_index_to_free) {
                  BUG_ON(amgm_index_to_free < dev->limits.num_mgms);
                  mthca_free(&dev->mcg_table.alloc, amgm_index_to_free);
            }
      } else {
            /* Remove entry from AMGM */
            int curr_next_index = be32_to_cpu(mgm->next_gid_index) >> 6;
            err = mthca_READ_MGM(dev, prev, mailbox, &status);
            if (err)
                  goto out;
            if (status) {
                  mthca_err(dev, "READ_MGM returned status %02x\n", status);
                  err = -EINVAL;
                  goto out;
            }

            mgm->next_gid_index = cpu_to_be32(curr_next_index << 6);

            err = mthca_WRITE_MGM(dev, prev, mailbox, &status);
            if (err)
                  goto out;
            if (status) {
                  mthca_err(dev, "WRITE_MGM returned status %02x\n", status);
                  err = -EINVAL;
                  goto out;
            }
            BUG_ON(index < dev->limits.num_mgms);
            mthca_free(&dev->mcg_table.alloc, index);
      }

 out:
      mutex_unlock(&dev->mcg_table.mutex);

      mthca_free_mailbox(dev, mailbox);
      return err;
}

int mthca_init_mcg_table(struct mthca_dev *dev)
{
      int err;
      int table_size = dev->limits.num_mgms + dev->limits.num_amgms;

      err = mthca_alloc_init(&dev->mcg_table.alloc,
                         table_size,
                         table_size - 1,
                         dev->limits.num_mgms);
      if (err)
            return err;

      mutex_init(&dev->mcg_table.mutex);

      return 0;
}

void mthca_cleanup_mcg_table(struct mthca_dev *dev)
{
      mthca_alloc_cleanup(&dev->mcg_table.alloc);
}

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