From 8ad11fb6b0739e704953e2b0aed453bf7d75d4f6 Mon Sep 17 00:00:00 2001 From: Jack Morgenstein Date: Wed, 1 Aug 2007 12:29:05 +0300 Subject: IB/mlx4: Implement FMRs Implement FMRs for mlx4. This is an adaptation of code from mthca. Signed-off-by: Jack Morgenstein Signed-off-by: Michael S. Tsirkin Signed-off-by: Roland Dreier --- drivers/net/mlx4/mr.c | 165 ++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 165 insertions(+) (limited to 'drivers/net/mlx4') diff --git a/drivers/net/mlx4/mr.c b/drivers/net/mlx4/mr.c index 3cc98c6..4bc39e6 100644 --- a/drivers/net/mlx4/mr.c +++ b/drivers/net/mlx4/mr.c @@ -68,6 +68,9 @@ struct mlx4_mpt_entry { #define MLX4_MTT_FLAG_PRESENT 1 +#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; @@ -469,3 +472,165 @@ void mlx4_cleanup_mr_table(struct mlx4_dev *dev) 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(); + + for (i = 0; i < npages; ++i) + fmr->mtts[i] = cpu_to_be64(page_list[i] | MLX4_MTT_FLAG_PRESENT); + + dma_sync_single(&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 < 12 || 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; + } + + fmr->mpt = mlx4_table_find(&priv->mr_table.dmpt_table, + key_to_hw_index(fmr->mr.key), NULL); + if (!fmr->mpt) { + 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) +{ + return mlx4_mr_enable(dev, &fmr->mr); +} +EXPORT_SYMBOL_GPL(mlx4_fmr_enable); + +void mlx4_fmr_unmap(struct mlx4_dev *dev, struct mlx4_fmr *fmr, + u32 *lkey, u32 *rkey) +{ + u32 key; + + if (!fmr->maps) + return; + + key = key_to_hw_index(fmr->mr.key); + key &= dev->caps.num_mpts - 1; + *lkey = *rkey = fmr->mr.key = hw_index_to_key(key); + + 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); -- cgit v1.1