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linux/drivers/infiniband/hw/mthca/mthca_mcg.c

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/*
* 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.
*/
#include <linux/string.h>
#include <linux/gfp.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;
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);
if (err) {
mthca_err(dev, "MGID_HASH failed (%d)\n", err);
goto out;
}
if (0)
mthca_dbg(dev, "Hash for %pI6 is %04x\n", gid, *hash);
*index = *hash;
*prev = -1;
do {
err = mthca_READ_MGM(dev, *index, mgm_mailbox);
if (err) {
mthca_err(dev, "READ_MGM failed (%d)\n", err);
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;
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);
if (err) {
mthca_err(dev, "READ_MGM failed (%d)\n", err);
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);
if (err) {
mthca_err(dev, "WRITE_MGM failed %d\n", err);
err = -EINVAL;
goto out;
}
if (!link)
goto out;
err = mthca_READ_MGM(dev, prev, mailbox);
if (err) {
mthca_err(dev, "READ_MGM failed %d\n", err);
goto out;
}
mgm->next_gid_index = cpu_to_be32(index << 6);
err = mthca_WRITE_MGM(dev, prev, mailbox);
if (err)
mthca_err(dev, "WRITE_MGM returned %d\n", err);
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;
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 %pI6 not found\n", gid->raw);
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);
if (err) {
mthca_err(dev, "WRITE_MGM returned %d\n", err);
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);
if (err) {
mthca_err(dev, "READ_MGM returned %d\n", err);
goto out;
}
} else
memset(mgm->gid, 0, 16);
err = mthca_WRITE_MGM(dev, index, mailbox);
if (err) {
mthca_err(dev, "WRITE_MGM returned %d\n", err);
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);
if (err) {
mthca_err(dev, "READ_MGM returned %d\n", err);
goto out;
}
mgm->next_gid_index = cpu_to_be32(curr_next_index << 6);
err = mthca_WRITE_MGM(dev, prev, mailbox);
if (err) {
mthca_err(dev, "WRITE_MGM returned %d\n", err);
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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