From: Ariel Levkovich <lariel@xxxxxxxxxxxx>
Adding mlx5_ib driver implementation for reg_dm_mr callback
which allows registering device memory (DM) as an MR for
local and remote access.
Signed-off-by: Ariel Levkovich <lariel@xxxxxxxxxxxx>
Signed-off-by: Leon Romanovsky <leonro@xxxxxxxxxxxx>
---
drivers/infiniband/hw/mlx5/main.c | 1 +
drivers/infiniband/hw/mlx5/mlx5_ib.h | 9 +++++
drivers/infiniband/hw/mlx5/mr.c | 77 ++++++++++++++++++++++++++++++++++++
3 files changed, 87 insertions(+)
diff --git a/drivers/infiniband/hw/mlx5/main.c b/drivers/infiniband/hw/mlx5/main.c
index c90a7805c9f3..779e202aea71 100644
--- a/drivers/infiniband/hw/mlx5/main.c
+++ b/drivers/infiniband/hw/mlx5/main.c
@@ -5230,6 +5230,7 @@ int mlx5_ib_stage_caps_init(struct mlx5_ib_dev *dev)
if (MLX5_CAP_DEV_MEM(mdev, memic)) {
dev->ib_dev.alloc_dm = mlx5_ib_alloc_dm;
dev->ib_dev.dealloc_dm = mlx5_ib_dealloc_dm;
+ dev->ib_dev.reg_dm_mr = mlx5_ib_reg_dm_mr;
}
dev->ib_dev.create_flow = mlx5_ib_create_flow;
diff --git a/drivers/infiniband/hw/mlx5/mlx5_ib.h b/drivers/infiniband/hw/mlx5/mlx5_ib.h
index a8ac6ce6ebd8..c710e9d5b685 100644
--- a/drivers/infiniband/hw/mlx5/mlx5_ib.h
+++ b/drivers/infiniband/hw/mlx5/mlx5_ib.h
@@ -530,6 +530,12 @@ struct mlx5_ib_dm {
#define MLX5_IB_MTT_PRESENT (MLX5_IB_MTT_READ | MLX5_IB_MTT_WRITE)
+#define MLX5_IB_DM_ALLOWED_ACCESS (IB_ACCESS_LOCAL_WRITE |\
+ IB_ACCESS_REMOTE_WRITE |\
+ IB_ACCESS_REMOTE_READ |\
+ IB_ACCESS_REMOTE_ATOMIC |\
+ IB_ZERO_BASED)
+
struct mlx5_ib_mr {
struct ib_mr ibmr;
void *descs;
@@ -1058,6 +1064,9 @@ struct ib_dm *mlx5_ib_alloc_dm(struct ib_device *ibdev,
struct ib_dm_alloc_attr *attr,
struct uverbs_attr_bundle *attrs);
int mlx5_ib_dealloc_dm(struct ib_dm *ibdm);
+struct ib_mr *mlx5_ib_reg_dm_mr(struct ib_pd *pd, struct ib_dm *dm,
+ struct ib_dm_mr_attr *attr,
+ struct uverbs_attr_bundle *attrs);
#ifdef CONFIG_INFINIBAND_ON_DEMAND_PAGING
void mlx5_ib_internal_fill_odp_caps(struct mlx5_ib_dev *dev);
diff --git a/drivers/infiniband/hw/mlx5/mr.c b/drivers/infiniband/hw/mlx5/mr.c
index 8d0fd92c4834..844733806fff 100644
--- a/drivers/infiniband/hw/mlx5/mr.c
+++ b/drivers/infiniband/hw/mlx5/mr.c
@@ -1207,6 +1207,83 @@ static void set_mr_fileds(struct mlx5_ib_dev *dev, struct mlx5_ib_mr *mr,
mr->access_flags = access_flags;
}
+static struct ib_mr *mlx5_ib_get_memic_mr(struct ib_pd *pd, u64 memic_addr,
+ u64 length, int acc)
+{
+ struct mlx5_ib_dev *dev = to_mdev(pd->device);
+ int inlen = MLX5_ST_SZ_BYTES(create_mkey_in);
+ struct mlx5_core_dev *mdev = dev->mdev;
+ struct mlx5_ib_mr *mr;
+ void *mkc;
+ u32 *in;
+ int err;
+
+ mr = kzalloc(sizeof(*mr), GFP_KERNEL);
+ if (!mr)
+ return ERR_PTR(-ENOMEM);
+
+ in = kzalloc(inlen, GFP_KERNEL);
+ if (!in) {
+ err = -ENOMEM;
+ goto err_free;
+ }
+
+ mkc = MLX5_ADDR_OF(create_mkey_in, in, memory_key_mkey_entry);
+
+ MLX5_SET(mkc, mkc, access_mode_1_0, MLX5_MKC_ACCESS_MODE_MEMIC & 0x3);
+ MLX5_SET(mkc, mkc, access_mode_4_2,
+ (MLX5_MKC_ACCESS_MODE_MEMIC >> 2) & 0x7);
+ MLX5_SET(mkc, mkc, a, !!(acc & IB_ACCESS_REMOTE_ATOMIC));
+ MLX5_SET(mkc, mkc, rw, !!(acc & IB_ACCESS_REMOTE_WRITE));
+ MLX5_SET(mkc, mkc, rr, !!(acc & IB_ACCESS_REMOTE_READ));
+ MLX5_SET(mkc, mkc, lw, !!(acc & IB_ACCESS_LOCAL_WRITE));
+ MLX5_SET(mkc, mkc, lr, 1);
+
+ MLX5_SET64(mkc, mkc, len, length);
+ MLX5_SET(mkc, mkc, pd, to_mpd(pd)->pdn);
+ MLX5_SET(mkc, mkc, qpn, 0xffffff);
+ MLX5_SET64(mkc, mkc, start_addr,
+ memic_addr - pci_resource_start(dev->mdev->pdev, 0));
+
+ err = mlx5_core_create_mkey(mdev, &mr->mmkey, in, inlen);
+ if (err)
+ goto err_in;
+
+ kfree(in);
+
+ mr->umem = NULL;
+ set_mr_fileds(dev, mr, 0, length, acc);
+
+ return &mr->ibmr;
+
+err_in:
+ kfree(in);
+
+err_free:
+ kfree(mr);
+
+ return ERR_PTR(err);
+}
+
+struct ib_mr *mlx5_ib_reg_dm_mr(struct ib_pd *pd, struct ib_dm *dm,
+ struct ib_dm_mr_attr *attr,
+ struct uverbs_attr_bundle *attrs)
+{
+ struct mlx5_ib_dm *mdm = to_mdm(dm);
+ u64 memic_addr;
+
+ if (attr->access_flags & ~MLX5_IB_DM_ALLOWED_ACCESS)
+ return ERR_PTR(-EINVAL);
+
+ if (attr->offset + attr->length > dm->length)
+ return ERR_PTR(-EINVAL);
+
+ memic_addr = mdm->dev_addr + attr->offset;
+
+ return mlx5_ib_get_memic_mr(pd, memic_addr, attr->length,
+ attr->access_flags);
+}
+
struct ib_mr *mlx5_ib_reg_user_mr(struct ib_pd *pd, u64 start, u64 length,
u64 virt_addr, int access_flags,
struct ib_udata *udata)
--
2.14.3
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