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Diffstat (limited to 'drivers/infiniband/hw/mthca/mthca_mcg.c')
-rw-r--r--drivers/infiniband/hw/mthca/mthca_mcg.c335
1 files changed, 335 insertions, 0 deletions
diff --git a/drivers/infiniband/hw/mthca/mthca_mcg.c b/drivers/infiniband/hw/mthca/mthca_mcg.c
new file mode 100644
index 000000000..6304ae8f4
--- /dev/null
+++ b/drivers/infiniband/hw/mthca/mthca_mcg.c
@@ -0,0 +1,335 @@
+/*
+ * 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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