1 files changed, 380 insertions, 0 deletions

diff --git a/drivers/net/mlx4/mcg.c b/drivers/net/mlx4/mcg.c
new file mode 100644
index 000000000000..672024a0ee71
--- /dev/null
+++ b/drivers/net/mlx4/mcg.c
@@ -0,0 +1,380 @@
+/*
+ * Copyright (c) 2006, 2007 Cisco Systems, Inc.  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/init.h>
+#include <linux/string.h>
+#include <linux/slab.h>
+
+#include <linux/mlx4/cmd.h>
+
+#include "mlx4.h"
+
+struct mlx4_mgm {
+        __be32                  next_gid_index;
+        __be32                  members_count;
+        u32                     reserved[2];
+        u8                      gid[16];
+        __be32                  qp[MLX4_QP_PER_MGM];
+};
+
+static const u8 zero_gid[16];   /* automatically initialized to 0 */
+
+static int mlx4_READ_MCG(struct mlx4_dev *dev, int index,
+                         struct mlx4_cmd_mailbox *mailbox)
+{
+        return mlx4_cmd_box(dev, 0, mailbox->dma, index, 0, MLX4_CMD_READ_MCG,
+                            MLX4_CMD_TIME_CLASS_A);
+}
+
+static int mlx4_WRITE_MCG(struct mlx4_dev *dev, int index,
+                          struct mlx4_cmd_mailbox *mailbox)
+{
+        return mlx4_cmd(dev, mailbox->dma, index, 0, MLX4_CMD_WRITE_MCG,
+                        MLX4_CMD_TIME_CLASS_A);
+}
+
+static int mlx4_MGID_HASH(struct mlx4_dev *dev, struct mlx4_cmd_mailbox *mailbox,
+                          u16 *hash)
+{
+        u64 imm;
+        int err;
+
+        err = mlx4_cmd_imm(dev, mailbox->dma, &imm, 0, 0, MLX4_CMD_MGID_HASH,
+                           MLX4_CMD_TIME_CLASS_A);
+
+        if (!err)
+                *hash = imm;
+
+        return err;
+}
+
+/*
+ * 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 mlx4_dev *dev,
+                    u8 *gid, struct mlx4_cmd_mailbox *mgm_mailbox,
+                    u16 *hash, int *prev, int *index)
+{
+        struct mlx4_cmd_mailbox *mailbox;
+        struct mlx4_mgm *mgm = mgm_mailbox->buf;
+        u8 *mgid;
+        int err;
+
+        mailbox = mlx4_alloc_cmd_mailbox(dev);
+        if (IS_ERR(mailbox))
+                return -ENOMEM;
+        mgid = mailbox->buf;
+
+        memcpy(mgid, gid, 16);
+
+        err = mlx4_MGID_HASH(dev, mailbox, hash);
+        mlx4_free_cmd_mailbox(dev, mailbox);
+        if (err)
+                return err;
+
+        if (0)
+                mlx4_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 = mlx4_READ_MCG(dev, *index, mgm_mailbox);
+                if (err)
+                        return err;
+
+                if (!memcmp(mgm->gid, zero_gid, 16)) {
+                        if (*index != *hash) {
+                                mlx4_err(dev, "Found zero MGID in AMGM.\n");
+                                err = -EINVAL;
+                        }
+                        return err;
+                }
+
+                if (!memcmp(mgm->gid, gid, 16))
+                        return err;
+
+                *prev = *index;
+                *index = be32_to_cpu(mgm->next_gid_index) >> 6;
+        } while (*index);
+
+        *index = -1;
+        return err;
+}
+
+int mlx4_multicast_attach(struct mlx4_dev *dev, struct mlx4_qp *qp, u8 gid[16])
+{
+        struct mlx4_priv *priv = mlx4_priv(dev);
+        struct mlx4_cmd_mailbox *mailbox;
+        struct mlx4_mgm *mgm;
+        u32 members_count;
+        u16 hash;
+        int index, prev;
+        int link = 0;
+        int i;
+        int err;
+
+        mailbox = mlx4_alloc_cmd_mailbox(dev);
+        if (IS_ERR(mailbox))
+                return PTR_ERR(mailbox);
+        mgm = mailbox->buf;
+
+        mutex_lock(&priv->mcg_table.mutex);
+
+        err = find_mgm(dev, gid, mailbox, &hash, &prev, &index);
+        if (err)
+                goto out;
+
+        if (index != -1) {
+                if (!memcmp(mgm->gid, zero_gid, 16))
+                        memcpy(mgm->gid, gid, 16);
+        } else {
+                link = 1;
+
+                index = mlx4_bitmap_alloc(&priv->mcg_table.bitmap);
+                if (index == -1) {
+                        mlx4_err(dev, "No AMGM entries left\n");
+                        err = -ENOMEM;
+                        goto out;
+                }
+                index += dev->caps.num_mgms;
+
+                err = mlx4_READ_MCG(dev, index, mailbox);
+                if (err)
+                        goto out;
+
+                memset(mgm, 0, sizeof *mgm);
+                memcpy(mgm->gid, gid, 16);
+        }
+
+        members_count = be32_to_cpu(mgm->members_count);
+        if (members_count == MLX4_QP_PER_MGM) {
+                mlx4_err(dev, "MGM at index %x is full.\n", index);
+                err = -ENOMEM;
+                goto out;
+        }
+
+        for (i = 0; i < members_count; ++i)
+                if (mgm->qp[i] == cpu_to_be32(qp->qpn)) {
+                        mlx4_dbg(dev, "QP %06x already a member of MGM\n", qp->qpn);
+                        err = 0;
+                        goto out;
+                }
+
+        mgm->qp[members_count++] = cpu_to_be32(qp->qpn);
+        mgm->members_count       = cpu_to_be32(members_count);
+
+        err = mlx4_WRITE_MCG(dev, index, mailbox);
+        if (err)
+                goto out;
+
+        if (!link)
+                goto out;
+
+        err = mlx4_READ_MCG(dev, prev, mailbox);
+        if (err)
+                goto out;
+
+        mgm->next_gid_index = cpu_to_be32(index << 6);
+
+        err = mlx4_WRITE_MCG(dev, prev, mailbox);
+        if (err)
+                goto out;
+
+out:
+        if (err && link && index != -1) {
+                if (index < dev->caps.num_mgms)
+                        mlx4_warn(dev, "Got AMGM index %d < %d",
+                                  index, dev->caps.num_mgms);
+                else
+                        mlx4_bitmap_free(&priv->mcg_table.bitmap,
+                                         index - dev->caps.num_mgms);
+        }
+        mutex_unlock(&priv->mcg_table.mutex);
+
+        mlx4_free_cmd_mailbox(dev, mailbox);
+        return err;
+}
+EXPORT_SYMBOL_GPL(mlx4_multicast_attach);
+
+int mlx4_multicast_detach(struct mlx4_dev *dev, struct mlx4_qp *qp, u8 gid[16])
+{
+        struct mlx4_priv *priv = mlx4_priv(dev);
+        struct mlx4_cmd_mailbox *mailbox;
+        struct mlx4_mgm *mgm;
+        u32 members_count;
+        u16 hash;
+        int prev, index;
+        int i, loc;
+        int err;
+
+        mailbox = mlx4_alloc_cmd_mailbox(dev);
+        if (IS_ERR(mailbox))
+                return PTR_ERR(mailbox);
+        mgm = mailbox->buf;
+
+        mutex_lock(&priv->mcg_table.mutex);
+
+        err = find_mgm(dev, gid, mailbox, &hash, &prev, &index);
+        if (err)
+                goto out;
+
+        if (index == -1) {
+                mlx4_err(dev, "MGID %04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x "
+                          "not found\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]));
+                err = -EINVAL;
+                goto out;
+        }
+
+        members_count = be32_to_cpu(mgm->members_count);
+        for (loc = -1, i = 0; i < members_count; ++i)
+                if (mgm->qp[i] == cpu_to_be32(qp->qpn))
+                        loc = i;
+
+        if (loc == -1) {
+                mlx4_err(dev, "QP %06x not found in MGM\n", qp->qpn);
+                err = -EINVAL;
+                goto out;
+        }
+
+
+        mgm->members_count = cpu_to_be32(--members_count);
+        mgm->qp[loc]       = mgm->qp[i - 1];
+        mgm->qp[i - 1]     = 0;
+
+        err = mlx4_WRITE_MCG(dev, index, mailbox);
+        if (err)
+                goto out;
+
+        if (i != 1)
+                goto out;
+
+        if (prev == -1) {
+                /* Remove entry from MGM */
+                int amgm_index = be32_to_cpu(mgm->next_gid_index) >> 6;
+                if (amgm_index) {
+                        err = mlx4_READ_MCG(dev, amgm_index, mailbox);
+                        if (err)
+                                goto out;
+                } else
+                        memset(mgm->gid, 0, 16);
+
+                err = mlx4_WRITE_MCG(dev, index, mailbox);
+                if (err)
+                        goto out;
+
+                if (amgm_index) {
+                        if (amgm_index < dev->caps.num_mgms)
+                                mlx4_warn(dev, "MGM entry %d had AMGM index %d < %d",
+                                          index, amgm_index, dev->caps.num_mgms);
+                        else
+                                mlx4_bitmap_free(&priv->mcg_table.bitmap,
+                                                 amgm_index - dev->caps.num_mgms);
+                }
+        } else {
+                /* Remove entry from AMGM */
+                int cur_next_index = be32_to_cpu(mgm->next_gid_index) >> 6;
+                err = mlx4_READ_MCG(dev, prev, mailbox);
+                if (err)
+                        goto out;
+
+                mgm->next_gid_index = cpu_to_be32(cur_next_index << 6);
+
+                err = mlx4_WRITE_MCG(dev, prev, mailbox);
+                if (err)
+                        goto out;
+
+                if (index < dev->caps.num_mgms)
+                        mlx4_warn(dev, "entry %d had next AMGM index %d < %d",
+                                  prev, index, dev->caps.num_mgms);
+                else
+                        mlx4_bitmap_free(&priv->mcg_table.bitmap,
+                                         index - dev->caps.num_mgms);
+        }
+
+out:
+        mutex_unlock(&priv->mcg_table.mutex);
+
+        mlx4_free_cmd_mailbox(dev, mailbox);
+        return err;
+}
+EXPORT_SYMBOL_GPL(mlx4_multicast_detach);
+
+int __devinit mlx4_init_mcg_table(struct mlx4_dev *dev)
+{
+        struct mlx4_priv *priv = mlx4_priv(dev);
+        int err;
+
+        err = mlx4_bitmap_init(&priv->mcg_table.bitmap,
+                               dev->caps.num_amgms, dev->caps.num_amgms - 1, 0);
+        if (err)
+                return err;
+
+        mutex_init(&priv->mcg_table.mutex);
+
+        return 0;
+}
+
+void mlx4_cleanup_mcg_table(struct mlx4_dev *dev)
+{
+        mlx4_bitmap_cleanup(&mlx4_priv(dev)->mcg_table.bitmap);
+}