1 files changed, 479 insertions, 0 deletions

diff --git a/drivers/net/mlx4/mr.c b/drivers/net/mlx4/mr.c
new file mode 100644
index 000000000000..b33864dab179
--- /dev/null
+++ b/drivers/net/mlx4/mr.c
@@ -0,0 +1,479 @@
+/*
+ * Copyright (c) 2004 Topspin Communications.  All rights reserved.
+ * Copyright (c) 2005 Mellanox Technologies. All rights reserved.
+ * 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/errno.h>
+
+#include <linux/mlx4/cmd.h>
+
+#include "mlx4.h"
+#include "icm.h"
+
+/*
+ * Must be packed because mtt_seg is 64 bits but only aligned to 32 bits.
+ */
+struct mlx4_mpt_entry {
+        __be32 flags;
+        __be32 qpn;
+        __be32 key;
+        __be32 pd;
+        __be64 start;
+        __be64 length;
+        __be32 lkey;
+        __be32 win_cnt;
+        u8      reserved1[3];
+        u8      mtt_rep;
+        __be64 mtt_seg;
+        __be32 mtt_sz;
+        __be32 entity_size;
+        __be32 first_byte_offset;
+} __attribute__((packed));
+
+#define MLX4_MPT_FLAG_SW_OWNS       (0xfUL << 28)
+#define MLX4_MPT_FLAG_MIO           (1 << 17)
+#define MLX4_MPT_FLAG_BIND_ENABLE   (1 << 15)
+#define MLX4_MPT_FLAG_PHYSICAL      (1 <<  9)
+#define MLX4_MPT_FLAG_REGION        (1 <<  8)
+
+#define MLX4_MTT_FLAG_PRESENT           1
+
+static u32 mlx4_buddy_alloc(struct mlx4_buddy *buddy, int order)
+{
+        int o;
+        int m;
+        u32 seg;
+
+        spin_lock(&buddy->lock);
+
+        for (o = order; o <= buddy->max_order; ++o) {
+                m = 1 << (buddy->max_order - o);
+                seg = find_first_bit(buddy->bits[o], m);
+                if (seg < m)
+                        goto found;
+        }
+
+        spin_unlock(&buddy->lock);
+        return -1;
+
+ found:
+        clear_bit(seg, buddy->bits[o]);
+
+        while (o > order) {
+                --o;
+                seg <<= 1;
+                set_bit(seg ^ 1, buddy->bits[o]);
+        }
+
+        spin_unlock(&buddy->lock);
+
+        seg <<= order;
+
+        return seg;
+}
+
+static void mlx4_buddy_free(struct mlx4_buddy *buddy, u32 seg, int order)
+{
+        seg >>= order;
+
+        spin_lock(&buddy->lock);
+
+        while (test_bit(seg ^ 1, buddy->bits[order])) {
+                clear_bit(seg ^ 1, buddy->bits[order]);
+                seg >>= 1;
+                ++order;
+        }
+
+        set_bit(seg, buddy->bits[order]);
+
+        spin_unlock(&buddy->lock);
+}
+
+static int __devinit mlx4_buddy_init(struct mlx4_buddy *buddy, int max_order)
+{
+        int i, s;
+
+        buddy->max_order = max_order;
+        spin_lock_init(&buddy->lock);
+
+        buddy->bits = kzalloc((buddy->max_order + 1) * sizeof (long *),
+                              GFP_KERNEL);
+        if (!buddy->bits)
+                goto err_out;
+
+        for (i = 0; i <= buddy->max_order; ++i) {
+                s = BITS_TO_LONGS(1 << (buddy->max_order - i));
+                buddy->bits[i] = kmalloc(s * sizeof (long), GFP_KERNEL);
+                if (!buddy->bits[i])
+                        goto err_out_free;
+                bitmap_zero(buddy->bits[i], 1 << (buddy->max_order - i));
+        }
+
+        set_bit(0, buddy->bits[buddy->max_order]);
+
+        return 0;
+
+err_out_free:
+        for (i = 0; i <= buddy->max_order; ++i)
+                kfree(buddy->bits[i]);
+
+        kfree(buddy->bits);
+
+err_out:
+        return -ENOMEM;
+}
+
+static void mlx4_buddy_cleanup(struct mlx4_buddy *buddy)
+{
+        int i;
+
+        for (i = 0; i <= buddy->max_order; ++i)
+                kfree(buddy->bits[i]);
+
+        kfree(buddy->bits);
+}
+
+static u32 mlx4_alloc_mtt_range(struct mlx4_dev *dev, int order)
+{
+        struct mlx4_mr_table *mr_table = &mlx4_priv(dev)->mr_table;
+        u32 seg;
+
+        seg = mlx4_buddy_alloc(&mr_table->mtt_buddy, order);
+        if (seg == -1)
+                return -1;
+
+        if (mlx4_table_get_range(dev, &mr_table->mtt_table, seg,
+                                 seg + (1 << order) - 1)) {
+                mlx4_buddy_free(&mr_table->mtt_buddy, seg, order);
+                return -1;
+        }
+
+        return seg;
+}
+
+int mlx4_mtt_init(struct mlx4_dev *dev, int npages, int page_shift,
+                  struct mlx4_mtt *mtt)
+{
+        int i;
+
+        if (!npages) {
+                mtt->order      = -1;
+                mtt->page_shift = MLX4_ICM_PAGE_SHIFT;
+                return 0;
+        } else
+                mtt->page_shift = page_shift;
+
+        for (mtt->order = 0, i = MLX4_MTT_ENTRY_PER_SEG; i < npages; i <<= 1)
+                ++mtt->order;
+
+        mtt->first_seg = mlx4_alloc_mtt_range(dev, mtt->order);
+        if (mtt->first_seg == -1)
+                return -ENOMEM;
+
+        return 0;
+}
+EXPORT_SYMBOL_GPL(mlx4_mtt_init);
+
+void mlx4_mtt_cleanup(struct mlx4_dev *dev, struct mlx4_mtt *mtt)
+{
+        struct mlx4_mr_table *mr_table = &mlx4_priv(dev)->mr_table;
+
+        if (mtt->order < 0)
+                return;
+
+        mlx4_buddy_free(&mr_table->mtt_buddy, mtt->first_seg, mtt->order);
+        mlx4_table_put_range(dev, &mr_table->mtt_table, mtt->first_seg,
+                             mtt->first_seg + (1 << mtt->order) - 1);
+}
+EXPORT_SYMBOL_GPL(mlx4_mtt_cleanup);
+
+u64 mlx4_mtt_addr(struct mlx4_dev *dev, struct mlx4_mtt *mtt)
+{
+        return (u64) mtt->first_seg * dev->caps.mtt_entry_sz;
+}
+EXPORT_SYMBOL_GPL(mlx4_mtt_addr);
+
+static u32 hw_index_to_key(u32 ind)
+{
+        return (ind >> 24) | (ind << 8);
+}
+
+static u32 key_to_hw_index(u32 key)
+{
+        return (key << 24) | (key >> 8);
+}
+
+static int mlx4_SW2HW_MPT(struct mlx4_dev *dev, struct mlx4_cmd_mailbox *mailbox,
+                          int mpt_index)
+{
+        return mlx4_cmd(dev, mailbox->dma, mpt_index, 0, MLX4_CMD_SW2HW_MPT,
+                        MLX4_CMD_TIME_CLASS_B);
+}
+
+static int mlx4_HW2SW_MPT(struct mlx4_dev *dev, struct mlx4_cmd_mailbox *mailbox,
+                          int mpt_index)
+{
+        return mlx4_cmd_box(dev, 0, mailbox ? mailbox->dma : 0, mpt_index,
+                            !mailbox, MLX4_CMD_HW2SW_MPT, MLX4_CMD_TIME_CLASS_B);
+}
+
+int mlx4_mr_alloc(struct mlx4_dev *dev, u32 pd, u64 iova, u64 size, u32 access,
+                  int npages, int page_shift, struct mlx4_mr *mr)
+{
+        struct mlx4_priv *priv = mlx4_priv(dev);
+        u32 index;
+        int err;
+
+        index = mlx4_bitmap_alloc(&priv->mr_table.mpt_bitmap);
+        if (index == -1) {
+                err = -ENOMEM;
+                goto err;
+        }
+
+        mr->iova       = iova;
+        mr->size       = size;
+        mr->pd         = pd;
+        mr->access     = access;
+        mr->enabled    = 0;
+        mr->key        = hw_index_to_key(index);
+
+        err = mlx4_mtt_init(dev, npages, page_shift, &mr->mtt);
+        if (err)
+                goto err_index;
+
+        return 0;
+
+err_index:
+        mlx4_bitmap_free(&priv->mr_table.mpt_bitmap, index);
+
+err:
+        kfree(mr);
+        return err;
+}
+EXPORT_SYMBOL_GPL(mlx4_mr_alloc);
+
+void mlx4_mr_free(struct mlx4_dev *dev, struct mlx4_mr *mr)
+{
+        struct mlx4_priv *priv = mlx4_priv(dev);
+        int err;
+
+        if (mr->enabled) {
+                err = mlx4_HW2SW_MPT(dev, NULL,
+                                     key_to_hw_index(mr->key) &
+                                     (dev->caps.num_mpts - 1));
+                if (err)
+                        mlx4_warn(dev, "HW2SW_MPT failed (%d)\n", err);
+        }
+
+        mlx4_mtt_cleanup(dev, &mr->mtt);
+        mlx4_bitmap_free(&priv->mr_table.mpt_bitmap, key_to_hw_index(mr->key));
+}
+EXPORT_SYMBOL_GPL(mlx4_mr_free);
+
+int mlx4_mr_enable(struct mlx4_dev *dev, struct mlx4_mr *mr)
+{
+        struct mlx4_mr_table *mr_table = &mlx4_priv(dev)->mr_table;
+        struct mlx4_cmd_mailbox *mailbox;
+        struct mlx4_mpt_entry *mpt_entry;
+        int err;
+
+        err = mlx4_table_get(dev, &mr_table->dmpt_table, key_to_hw_index(mr->key));
+        if (err)
+                return err;
+
+        mailbox = mlx4_alloc_cmd_mailbox(dev);
+        if (IS_ERR(mailbox)) {
+                err = PTR_ERR(mailbox);
+                goto err_table;
+        }
+        mpt_entry = mailbox->buf;
+
+        memset(mpt_entry, 0, sizeof *mpt_entry);
+
+        mpt_entry->flags = cpu_to_be32(MLX4_MPT_FLAG_SW_OWNS     |
+                                       MLX4_MPT_FLAG_MIO         |
+                                       MLX4_MPT_FLAG_REGION      |
+                                       mr->access);
+        if (mr->mtt.order < 0)
+                mpt_entry->flags |= cpu_to_be32(MLX4_MPT_FLAG_PHYSICAL);
+
+        mpt_entry->key         = cpu_to_be32(key_to_hw_index(mr->key));
+        mpt_entry->pd          = cpu_to_be32(mr->pd);
+        mpt_entry->start       = cpu_to_be64(mr->iova);
+        mpt_entry->length      = cpu_to_be64(mr->size);
+        mpt_entry->entity_size = cpu_to_be32(mr->mtt.page_shift);
+        mpt_entry->mtt_seg     = cpu_to_be64(mlx4_mtt_addr(dev, &mr->mtt));
+
+        err = mlx4_SW2HW_MPT(dev, mailbox,
+                             key_to_hw_index(mr->key) & (dev->caps.num_mpts - 1));
+        if (err) {
+                mlx4_warn(dev, "SW2HW_MPT failed (%d)\n", err);
+                goto err_cmd;
+        }
+
+        mr->enabled = 1;
+
+        mlx4_free_cmd_mailbox(dev, mailbox);
+
+        return 0;
+
+err_cmd:
+        mlx4_free_cmd_mailbox(dev, mailbox);
+
+err_table:
+        mlx4_table_put(dev, &mr_table->dmpt_table, key_to_hw_index(mr->key));
+        return err;
+}
+EXPORT_SYMBOL_GPL(mlx4_mr_enable);
+
+static int mlx4_WRITE_MTT(struct mlx4_dev *dev, struct mlx4_cmd_mailbox *mailbox,
+                          int num_mtt)
+{
+        return mlx4_cmd(dev, mailbox->dma, num_mtt, 0, MLX4_CMD_WRITE_MTT,
+                        MLX4_CMD_TIME_CLASS_B);
+}
+
+int mlx4_write_mtt(struct mlx4_dev *dev, struct mlx4_mtt *mtt,
+                   int start_index, int npages, u64 *page_list)
+{
+        struct mlx4_cmd_mailbox *mailbox;
+        __be64 *mtt_entry;
+        int i;
+        int err = 0;
+
+        if (mtt->order < 0)
+                return -EINVAL;
+
+        mailbox = mlx4_alloc_cmd_mailbox(dev);
+        if (IS_ERR(mailbox))
+                return PTR_ERR(mailbox);
+
+        mtt_entry = mailbox->buf;
+
+        while (npages > 0) {
+                mtt_entry[0] = cpu_to_be64(mlx4_mtt_addr(dev, mtt) + start_index * 8);
+                mtt_entry[1] = 0;
+
+                for (i = 0; i < npages && i < MLX4_MAILBOX_SIZE / 8 - 2; ++i)
+                        mtt_entry[i + 2] = cpu_to_be64(page_list[i] |
+                                                       MLX4_MTT_FLAG_PRESENT);
+
+                /*
+                 * If we have an odd number of entries to write, add
+                 * one more dummy entry for firmware efficiency.
+                 */
+                if (i & 1)
+                        mtt_entry[i + 2] = 0;
+
+                err = mlx4_WRITE_MTT(dev, mailbox, (i + 1) & ~1);
+                if (err)
+                        goto out;
+
+                npages      -= i;
+                start_index += i;
+                page_list   += i;
+        }
+
+out:
+        mlx4_free_cmd_mailbox(dev, mailbox);
+
+        return err;
+}
+EXPORT_SYMBOL_GPL(mlx4_write_mtt);
+
+int mlx4_buf_write_mtt(struct mlx4_dev *dev, struct mlx4_mtt *mtt,
+                       struct mlx4_buf *buf)
+{
+        u64 *page_list;
+        int err;
+        int i;
+
+        page_list = kmalloc(buf->npages * sizeof *page_list, GFP_KERNEL);
+        if (!page_list)
+                return -ENOMEM;
+
+        for (i = 0; i < buf->npages; ++i)
+                if (buf->nbufs == 1)
+                        page_list[i] = buf->u.direct.map + (i << buf->page_shift);
+                else
+                        page_list[i] = buf->u.page_list[i].map;
+
+        err = mlx4_write_mtt(dev, mtt, 0, buf->npages, page_list);
+
+        kfree(page_list);
+        return err;
+}
+EXPORT_SYMBOL_GPL(mlx4_buf_write_mtt);
+
+int __devinit mlx4_init_mr_table(struct mlx4_dev *dev)
+{
+        struct mlx4_mr_table *mr_table = &mlx4_priv(dev)->mr_table;
+        int err;
+
+        err = mlx4_bitmap_init(&mr_table->mpt_bitmap, dev->caps.num_mpts,
+                               ~0, dev->caps.reserved_mrws);
+        if (err)
+                return err;
+
+        err = mlx4_buddy_init(&mr_table->mtt_buddy,
+                              ilog2(dev->caps.num_mtt_segs));
+        if (err)
+                goto err_buddy;
+
+        if (dev->caps.reserved_mtts) {
+                if (mlx4_alloc_mtt_range(dev, ilog2(dev->caps.reserved_mtts)) == -1) {
+                        mlx4_warn(dev, "MTT table of order %d is too small.\n",
+                                  mr_table->mtt_buddy.max_order);
+                        err = -ENOMEM;
+                        goto err_reserve_mtts;
+                }
+        }
+
+        return 0;
+
+err_reserve_mtts:
+        mlx4_buddy_cleanup(&mr_table->mtt_buddy);
+
+err_buddy:
+        mlx4_bitmap_cleanup(&mr_table->mpt_bitmap);
+
+        return err;
+}
+
+void mlx4_cleanup_mr_table(struct mlx4_dev *dev)
+{
+        struct mlx4_mr_table *mr_table = &mlx4_priv(dev)->mr_table;
+
+        mlx4_buddy_cleanup(&mr_table->mtt_buddy);
+        mlx4_bitmap_cleanup(&mr_table->mpt_bitmap);
+}