diff options
Diffstat (limited to 'drivers/net/ethernet/mellanox/mlx4/mr.c')
| -rw-r--r-- | drivers/net/ethernet/mellanox/mlx4/mr.c | 668 |
1 files changed, 668 insertions, 0 deletions
diff --git a/drivers/net/ethernet/mellanox/mlx4/mr.c b/drivers/net/ethernet/mellanox/mlx4/mr.c new file mode 100644 index 00000000000..efa3e77355e --- /dev/null +++ b/drivers/net/ethernet/mellanox/mlx4/mr.c @@ -0,0 +1,668 @@ +/* + * Copyright (c) 2004 Topspin Communications. All rights reserved. + * Copyright (c) 2005, 2006, 2007, 2008 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/errno.h> +#include <linux/export.h> +#include <linux/slab.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_flags; + __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; +} __packed; + +#define MLX4_MPT_FLAG_SW_OWNS (0xfUL << 28) +#define MLX4_MPT_FLAG_FREE (0x3UL << 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_MPT_PD_FLAG_FAST_REG (1 << 27) +#define MLX4_MPT_PD_FLAG_RAE (1 << 28) +#define MLX4_MPT_PD_FLAG_EN_INV (3 << 24) + +#define MLX4_MPT_STATUS_SW 0xF0 +#define MLX4_MPT_STATUS_HW 0x00 + +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) + if (buddy->num_free[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]); + --buddy->num_free[o]; + + while (o > order) { + --o; + seg <<= 1; + set_bit(seg ^ 1, buddy->bits[o]); + ++buddy->num_free[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]); + --buddy->num_free[order]; + seg >>= 1; + ++order; + } + + set_bit(seg, buddy->bits[order]); + ++buddy->num_free[order]; + + spin_unlock(&buddy->lock); +} + +static int 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); + buddy->num_free = kcalloc((buddy->max_order + 1), sizeof *buddy->num_free, + GFP_KERNEL); + if (!buddy->bits || !buddy->num_free) + 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]); + buddy->num_free[buddy->max_order] = 1; + + return 0; + +err_out_free: + for (i = 0; i <= buddy->max_order; ++i) + kfree(buddy->bits[i]); + +err_out: + kfree(buddy->bits); + kfree(buddy->num_free); + + 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); + kfree(buddy->num_free); +} + +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 = dev->caps.mtts_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) + return -ENOMEM; + + 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) + mlx4_bitmap_free(&priv->mr_table.mpt_bitmap, index); + + 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_MIO | + MLX4_MPT_FLAG_REGION | + mr->access); + + mpt_entry->key = cpu_to_be32(key_to_hw_index(mr->key)); + mpt_entry->pd_flags = cpu_to_be32(mr->pd | MLX4_MPT_PD_FLAG_EN_INV); + 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); + + if (mr->mtt.order < 0) { + mpt_entry->flags |= cpu_to_be32(MLX4_MPT_FLAG_PHYSICAL); + mpt_entry->mtt_seg = 0; + } else { + mpt_entry->mtt_seg = cpu_to_be64(mlx4_mtt_addr(dev, &mr->mtt)); + } + + if (mr->mtt.order >= 0 && mr->mtt.page_shift == 0) { + /* fast register MR in free state */ + mpt_entry->flags |= cpu_to_be32(MLX4_MPT_FLAG_FREE); + mpt_entry->pd_flags |= cpu_to_be32(MLX4_MPT_PD_FLAG_FAST_REG | + MLX4_MPT_PD_FLAG_RAE); + mpt_entry->mtt_sz = cpu_to_be32((1 << mr->mtt.order) * + dev->caps.mtts_per_seg); + } else { + mpt_entry->flags |= cpu_to_be32(MLX4_MPT_FLAG_SW_OWNS); + } + + 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_chunk(struct mlx4_dev *dev, struct mlx4_mtt *mtt, + int start_index, int npages, u64 *page_list) +{ + struct mlx4_priv *priv = mlx4_priv(dev); + __be64 *mtts; + dma_addr_t dma_handle; + int i; + int s = start_index * sizeof (u64); + + /* All MTTs must fit in the same page */ + if (start_index / (PAGE_SIZE / sizeof (u64)) != + (start_index + npages - 1) / (PAGE_SIZE / sizeof (u64))) + return -EINVAL; + + if (start_index & (dev->caps.mtts_per_seg - 1)) + return -EINVAL; + + mtts = mlx4_table_find(&priv->mr_table.mtt_table, mtt->first_seg + + s / dev->caps.mtt_entry_sz, &dma_handle); + if (!mtts) + return -ENOMEM; + + dma_sync_single_for_cpu(&dev->pdev->dev, dma_handle, + npages * sizeof (u64), DMA_TO_DEVICE); + + for (i = 0; i < npages; ++i) + mtts[i] = cpu_to_be64(page_list[i] | MLX4_MTT_FLAG_PRESENT); + + dma_sync_single_for_device(&dev->pdev->dev, dma_handle, + npages * sizeof (u64), DMA_TO_DEVICE); + + return 0; +} + +int mlx4_write_mtt(struct mlx4_dev *dev, struct mlx4_mtt *mtt, + int start_index, int npages, u64 *page_list) +{ + int chunk; + int err; + + if (mtt->order < 0) + return -EINVAL; + + while (npages > 0) { + chunk = min_t(int, PAGE_SIZE / sizeof(u64), npages); + err = mlx4_write_mtt_chunk(dev, mtt, start_index, chunk, page_list); + if (err) + return err; + + npages -= chunk; + start_index += chunk; + page_list += chunk; + } + + return 0; +} +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->direct.map + (i << buf->page_shift); + else + page_list[i] = buf->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 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, 0); + 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, fls(dev->caps.reserved_mtts - 1)) == -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); +} + +static inline int mlx4_check_fmr(struct mlx4_fmr *fmr, u64 *page_list, + int npages, u64 iova) +{ + int i, page_mask; + + if (npages > fmr->max_pages) + return -EINVAL; + + page_mask = (1 << fmr->page_shift) - 1; + + /* We are getting page lists, so va must be page aligned. */ + if (iova & page_mask) + return -EINVAL; + + /* Trust the user not to pass misaligned data in page_list */ + if (0) + for (i = 0; i < npages; ++i) { + if (page_list[i] & ~page_mask) + return -EINVAL; + } + + if (fmr->maps >= fmr->max_maps) + return -EINVAL; + + return 0; +} + +int mlx4_map_phys_fmr(struct mlx4_dev *dev, struct mlx4_fmr *fmr, u64 *page_list, + int npages, u64 iova, u32 *lkey, u32 *rkey) +{ + u32 key; + int i, err; + + err = mlx4_check_fmr(fmr, page_list, npages, iova); + if (err) + return err; + + ++fmr->maps; + + key = key_to_hw_index(fmr->mr.key); + key += dev->caps.num_mpts; + *lkey = *rkey = fmr->mr.key = hw_index_to_key(key); + + *(u8 *) fmr->mpt = MLX4_MPT_STATUS_SW; + + /* Make sure MPT status is visible before writing MTT entries */ + wmb(); + + dma_sync_single_for_cpu(&dev->pdev->dev, fmr->dma_handle, + npages * sizeof(u64), DMA_TO_DEVICE); + + for (i = 0; i < npages; ++i) + fmr->mtts[i] = cpu_to_be64(page_list[i] | MLX4_MTT_FLAG_PRESENT); + + dma_sync_single_for_device(&dev->pdev->dev, fmr->dma_handle, + npages * sizeof(u64), DMA_TO_DEVICE); + + fmr->mpt->key = cpu_to_be32(key); + fmr->mpt->lkey = cpu_to_be32(key); + fmr->mpt->length = cpu_to_be64(npages * (1ull << fmr->page_shift)); + fmr->mpt->start = cpu_to_be64(iova); + + /* Make MTT entries are visible before setting MPT status */ + wmb(); + + *(u8 *) fmr->mpt = MLX4_MPT_STATUS_HW; + + /* Make sure MPT status is visible before consumer can use FMR */ + wmb(); + + return 0; +} +EXPORT_SYMBOL_GPL(mlx4_map_phys_fmr); + +int mlx4_fmr_alloc(struct mlx4_dev *dev, u32 pd, u32 access, int max_pages, + int max_maps, u8 page_shift, struct mlx4_fmr *fmr) +{ + struct mlx4_priv *priv = mlx4_priv(dev); + u64 mtt_seg; + int err = -ENOMEM; + + if (page_shift < (ffs(dev->caps.page_size_cap) - 1) || page_shift >= 32) + return -EINVAL; + + /* All MTTs must fit in the same page */ + if (max_pages * sizeof *fmr->mtts > PAGE_SIZE) + return -EINVAL; + + fmr->page_shift = page_shift; + fmr->max_pages = max_pages; + fmr->max_maps = max_maps; + fmr->maps = 0; + + err = mlx4_mr_alloc(dev, pd, 0, 0, access, max_pages, + page_shift, &fmr->mr); + if (err) + return err; + + mtt_seg = fmr->mr.mtt.first_seg * dev->caps.mtt_entry_sz; + + fmr->mtts = mlx4_table_find(&priv->mr_table.mtt_table, + fmr->mr.mtt.first_seg, + &fmr->dma_handle); + if (!fmr->mtts) { + err = -ENOMEM; + goto err_free; + } + + return 0; + +err_free: + mlx4_mr_free(dev, &fmr->mr); + return err; +} +EXPORT_SYMBOL_GPL(mlx4_fmr_alloc); + +int mlx4_fmr_enable(struct mlx4_dev *dev, struct mlx4_fmr *fmr) +{ + struct mlx4_priv *priv = mlx4_priv(dev); + int err; + + err = mlx4_mr_enable(dev, &fmr->mr); + if (err) + return err; + + fmr->mpt = mlx4_table_find(&priv->mr_table.dmpt_table, + key_to_hw_index(fmr->mr.key), NULL); + if (!fmr->mpt) + return -ENOMEM; + + return 0; +} +EXPORT_SYMBOL_GPL(mlx4_fmr_enable); + +void mlx4_fmr_unmap(struct mlx4_dev *dev, struct mlx4_fmr *fmr, + u32 *lkey, u32 *rkey) +{ + if (!fmr->maps) + return; + + fmr->maps = 0; + + *(u8 *) fmr->mpt = MLX4_MPT_STATUS_SW; +} +EXPORT_SYMBOL_GPL(mlx4_fmr_unmap); + +int mlx4_fmr_free(struct mlx4_dev *dev, struct mlx4_fmr *fmr) +{ + if (fmr->maps) + return -EBUSY; + + fmr->mr.enabled = 0; + mlx4_mr_free(dev, &fmr->mr); + + return 0; +} +EXPORT_SYMBOL_GPL(mlx4_fmr_free); + +int mlx4_SYNC_TPT(struct mlx4_dev *dev) +{ + return mlx4_cmd(dev, 0, 0, 0, MLX4_CMD_SYNC_TPT, 1000); +} +EXPORT_SYMBOL_GPL(mlx4_SYNC_TPT); |