336 lines
7.9 KiB
C
336 lines
7.9 KiB
C
/*
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* Copyright (c) 2004 Topspin Communications. All rights reserved.
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*
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* This software is available to you under a choice of one of two
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* licenses. You may choose to be licensed under the terms of the GNU
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* General Public License (GPL) Version 2, available from the file
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* COPYING in the main directory of this source tree, or the
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* OpenIB.org BSD license below:
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*
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* Redistribution and use in source and binary forms, with or
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* without modification, are permitted provided that the following
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* conditions are met:
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*
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* - Redistributions of source code must retain the above
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* copyright notice, this list of conditions and the following
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* disclaimer.
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*
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* - Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following
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* disclaimer in the documentation and/or other materials
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* provided with the distribution.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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#include <linux/string.h>
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#include <linux/gfp.h>
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#include "mthca_dev.h"
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#include "mthca_cmd.h"
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struct mthca_mgm {
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__be32 next_gid_index;
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u32 reserved[3];
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u8 gid[16];
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__be32 qp[MTHCA_QP_PER_MGM];
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};
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static const u8 zero_gid[16]; /* automatically initialized to 0 */
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/*
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* Caller must hold MCG table semaphore. gid and mgm parameters must
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* be properly aligned for command interface.
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*
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* Returns 0 unless a firmware command error occurs.
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*
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* If GID is found in MGM or MGM is empty, *index = *hash, *prev = -1
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* and *mgm holds MGM entry.
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*
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* if GID is found in AMGM, *index = index in AMGM, *prev = index of
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* previous entry in hash chain and *mgm holds AMGM entry.
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*
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* If no AMGM exists for given gid, *index = -1, *prev = index of last
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* entry in hash chain and *mgm holds end of hash chain.
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*/
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static int find_mgm(struct mthca_dev *dev,
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u8 *gid, struct mthca_mailbox *mgm_mailbox,
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u16 *hash, int *prev, int *index)
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{
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struct mthca_mailbox *mailbox;
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struct mthca_mgm *mgm = mgm_mailbox->buf;
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u8 *mgid;
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int err;
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mailbox = mthca_alloc_mailbox(dev, GFP_KERNEL);
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if (IS_ERR(mailbox))
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return -ENOMEM;
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mgid = mailbox->buf;
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memcpy(mgid, gid, 16);
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err = mthca_MGID_HASH(dev, mailbox, hash);
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if (err) {
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mthca_err(dev, "MGID_HASH failed (%d)\n", err);
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goto out;
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}
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if (0)
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mthca_dbg(dev, "Hash for %pI6 is %04x\n", gid, *hash);
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*index = *hash;
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*prev = -1;
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do {
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err = mthca_READ_MGM(dev, *index, mgm_mailbox);
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if (err) {
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mthca_err(dev, "READ_MGM failed (%d)\n", err);
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goto out;
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}
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if (!memcmp(mgm->gid, zero_gid, 16)) {
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if (*index != *hash) {
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mthca_err(dev, "Found zero MGID in AMGM.\n");
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err = -EINVAL;
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}
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goto out;
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}
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if (!memcmp(mgm->gid, gid, 16))
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goto out;
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*prev = *index;
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*index = be32_to_cpu(mgm->next_gid_index) >> 6;
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} while (*index);
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*index = -1;
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out:
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mthca_free_mailbox(dev, mailbox);
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return err;
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}
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int mthca_multicast_attach(struct ib_qp *ibqp, union ib_gid *gid, u16 lid)
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{
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struct mthca_dev *dev = to_mdev(ibqp->device);
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struct mthca_mailbox *mailbox;
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struct mthca_mgm *mgm;
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u16 hash;
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int index, prev;
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int link = 0;
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int i;
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int err;
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mailbox = mthca_alloc_mailbox(dev, GFP_KERNEL);
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if (IS_ERR(mailbox))
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return PTR_ERR(mailbox);
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mgm = mailbox->buf;
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mutex_lock(&dev->mcg_table.mutex);
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err = find_mgm(dev, gid->raw, mailbox, &hash, &prev, &index);
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if (err)
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goto out;
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if (index != -1) {
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if (!memcmp(mgm->gid, zero_gid, 16))
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memcpy(mgm->gid, gid->raw, 16);
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} else {
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link = 1;
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index = mthca_alloc(&dev->mcg_table.alloc);
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if (index == -1) {
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mthca_err(dev, "No AMGM entries left\n");
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err = -ENOMEM;
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goto out;
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}
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err = mthca_READ_MGM(dev, index, mailbox);
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if (err) {
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mthca_err(dev, "READ_MGM failed (%d)\n", err);
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goto out;
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}
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memset(mgm, 0, sizeof *mgm);
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memcpy(mgm->gid, gid->raw, 16);
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}
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for (i = 0; i < MTHCA_QP_PER_MGM; ++i)
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if (mgm->qp[i] == cpu_to_be32(ibqp->qp_num | (1 << 31))) {
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mthca_dbg(dev, "QP %06x already a member of MGM\n",
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ibqp->qp_num);
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err = 0;
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goto out;
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} else if (!(mgm->qp[i] & cpu_to_be32(1 << 31))) {
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mgm->qp[i] = cpu_to_be32(ibqp->qp_num | (1 << 31));
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break;
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}
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if (i == MTHCA_QP_PER_MGM) {
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mthca_err(dev, "MGM at index %x is full.\n", index);
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err = -ENOMEM;
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goto out;
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}
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err = mthca_WRITE_MGM(dev, index, mailbox);
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if (err) {
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mthca_err(dev, "WRITE_MGM failed %d\n", err);
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err = -EINVAL;
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goto out;
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}
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if (!link)
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goto out;
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err = mthca_READ_MGM(dev, prev, mailbox);
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if (err) {
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mthca_err(dev, "READ_MGM failed %d\n", err);
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goto out;
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}
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mgm->next_gid_index = cpu_to_be32(index << 6);
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err = mthca_WRITE_MGM(dev, prev, mailbox);
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if (err)
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mthca_err(dev, "WRITE_MGM returned %d\n", err);
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out:
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if (err && link && index != -1) {
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BUG_ON(index < dev->limits.num_mgms);
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mthca_free(&dev->mcg_table.alloc, index);
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}
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mutex_unlock(&dev->mcg_table.mutex);
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mthca_free_mailbox(dev, mailbox);
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return err;
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}
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int mthca_multicast_detach(struct ib_qp *ibqp, union ib_gid *gid, u16 lid)
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{
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struct mthca_dev *dev = to_mdev(ibqp->device);
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struct mthca_mailbox *mailbox;
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struct mthca_mgm *mgm;
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u16 hash;
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int prev, index;
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int i, loc;
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int err;
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mailbox = mthca_alloc_mailbox(dev, GFP_KERNEL);
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if (IS_ERR(mailbox))
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return PTR_ERR(mailbox);
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mgm = mailbox->buf;
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mutex_lock(&dev->mcg_table.mutex);
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err = find_mgm(dev, gid->raw, mailbox, &hash, &prev, &index);
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if (err)
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goto out;
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if (index == -1) {
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mthca_err(dev, "MGID %pI6 not found\n", gid->raw);
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err = -EINVAL;
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goto out;
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}
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for (loc = -1, i = 0; i < MTHCA_QP_PER_MGM; ++i) {
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if (mgm->qp[i] == cpu_to_be32(ibqp->qp_num | (1 << 31)))
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loc = i;
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if (!(mgm->qp[i] & cpu_to_be32(1 << 31)))
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break;
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}
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if (loc == -1) {
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mthca_err(dev, "QP %06x not found in MGM\n", ibqp->qp_num);
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err = -EINVAL;
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goto out;
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}
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mgm->qp[loc] = mgm->qp[i - 1];
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mgm->qp[i - 1] = 0;
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err = mthca_WRITE_MGM(dev, index, mailbox);
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if (err) {
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mthca_err(dev, "WRITE_MGM returned %d\n", err);
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goto out;
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}
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if (i != 1)
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goto out;
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if (prev == -1) {
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/* Remove entry from MGM */
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int amgm_index_to_free = be32_to_cpu(mgm->next_gid_index) >> 6;
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if (amgm_index_to_free) {
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err = mthca_READ_MGM(dev, amgm_index_to_free,
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mailbox);
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if (err) {
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mthca_err(dev, "READ_MGM returned %d\n", err);
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goto out;
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}
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} else
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memset(mgm->gid, 0, 16);
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err = mthca_WRITE_MGM(dev, index, mailbox);
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if (err) {
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mthca_err(dev, "WRITE_MGM returned %d\n", err);
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goto out;
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}
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if (amgm_index_to_free) {
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BUG_ON(amgm_index_to_free < dev->limits.num_mgms);
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mthca_free(&dev->mcg_table.alloc, amgm_index_to_free);
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}
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} else {
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/* Remove entry from AMGM */
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int curr_next_index = be32_to_cpu(mgm->next_gid_index) >> 6;
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err = mthca_READ_MGM(dev, prev, mailbox);
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if (err) {
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mthca_err(dev, "READ_MGM returned %d\n", err);
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goto out;
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}
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mgm->next_gid_index = cpu_to_be32(curr_next_index << 6);
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err = mthca_WRITE_MGM(dev, prev, mailbox);
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if (err) {
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mthca_err(dev, "WRITE_MGM returned %d\n", err);
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goto out;
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}
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BUG_ON(index < dev->limits.num_mgms);
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mthca_free(&dev->mcg_table.alloc, index);
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}
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out:
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mutex_unlock(&dev->mcg_table.mutex);
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mthca_free_mailbox(dev, mailbox);
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return err;
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}
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int mthca_init_mcg_table(struct mthca_dev *dev)
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{
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int err;
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int table_size = dev->limits.num_mgms + dev->limits.num_amgms;
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err = mthca_alloc_init(&dev->mcg_table.alloc,
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table_size,
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table_size - 1,
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dev->limits.num_mgms);
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if (err)
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return err;
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mutex_init(&dev->mcg_table.mutex);
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return 0;
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}
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void mthca_cleanup_mcg_table(struct mthca_dev *dev)
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{
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mthca_alloc_cleanup(&dev->mcg_table.alloc);
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}
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