Re: [PATCH for-4.3 02/15] IB: Modify ib_create_mr API

Steve Wise <swise@xxxxxxxxxxxxxxxxxxxxx> · Thu, 30 Jul 2015 09:50:59 -0500

On 7/30/2015 2:32 AM, Sagi Grimberg wrote:
Use ib_alloc_mr with specific parameters.
Change the existing callers.

Signed-off-by: Sagi Grimberg <sagig@xxxxxxxxxxxx>
---
  drivers/infiniband/core/verbs.c          | 31 ++++++++++++++++++++------
  drivers/infiniband/hw/mlx5/main.c        |  2 +-
  drivers/infiniband/hw/mlx5/mlx5_ib.h     |  5 +++--
  drivers/infiniband/hw/mlx5/mr.c          | 17 ++++++++++-----
  drivers/infiniband/ulp/iser/iser_verbs.c |  6 ++----
  drivers/infiniband/ulp/isert/ib_isert.c  |  6 +-----
  include/rdma/ib_verbs.h                  | 37 +++++++++++++-------------------
  7 files changed, 58 insertions(+), 46 deletions(-)

diff --git a/drivers/infiniband/core/verbs.c b/drivers/infiniband/core/verbs.c
index 003bb62..2ac599b 100644
--- a/drivers/infiniband/core/verbs.c
+++ b/drivers/infiniband/core/verbs.c
@@ -1272,15 +1272,32 @@ int ib_dereg_mr(struct ib_mr *mr)
  }
  EXPORT_SYMBOL(ib_dereg_mr);
  
-struct ib_mr *ib_create_mr(struct ib_pd *pd,
-			   struct ib_mr_init_attr *mr_init_attr)
+/**
+ * ib_alloc_mr() - Allocates a memory region
+ * @pd:            protection domain associated with the region
+ * @mr_type:       memory region type
+ * @max_num_sg:    maximum sg entries available for registration.
+ *
+ * Notes:
+ * Memory registeration page/sg lists must not exceed max_num_sg.
+ * For mr_type IB_MR_TYPE_MEM_REG, the total length cannot exceed
+ * max_num_sg * used_page_size.
+ *

Nit:  the above sounds like used_page_size is a variable.  Something 
like this might work?

"max_num_sg * the page size used for this sg list."


+ */
+struct ib_mr *ib_alloc_mr(struct ib_pd *pd,
+			  enum ib_mr_type mr_type,
+			  u32 max_num_sg)
  {
  	struct ib_mr *mr;
  
-	if (!pd->device->create_mr)
-		return ERR_PTR(-ENOSYS);
-
-	mr = pd->device->create_mr(pd, mr_init_attr);
+	if (pd->device->alloc_mr) {
+		mr = pd->device->alloc_mr(pd, mr_type, max_num_sg);
+	} else {
+		if (mr_type != IB_MR_TYPE_MEM_REG ||
+		    !pd->device->alloc_fast_reg_mr)
+			return ERR_PTR(-ENOSYS);
+		mr = pd->device->alloc_fast_reg_mr(pd, max_num_sg);
+	}
  
  	if (!IS_ERR(mr)) {
  		mr->device  = pd->device;
@@ -1292,7 +1309,7 @@ struct ib_mr *ib_create_mr(struct ib_pd *pd,
  
  	return mr;
  }
-EXPORT_SYMBOL(ib_create_mr);
+EXPORT_SYMBOL(ib_alloc_mr);
  
  struct ib_mr *ib_alloc_fast_reg_mr(struct ib_pd *pd, int max_page_list_len)
  {
diff --git a/drivers/infiniband/hw/mlx5/main.c b/drivers/infiniband/hw/mlx5/main.c
index 46d1383..2c2a461 100644
--- a/drivers/infiniband/hw/mlx5/main.c
+++ b/drivers/infiniband/hw/mlx5/main.c
@@ -1489,7 +1489,7 @@ static void *mlx5_ib_add(struct mlx5_core_dev *mdev)
  	dev->ib_dev.attach_mcast	= mlx5_ib_mcg_attach;
  	dev->ib_dev.detach_mcast	= mlx5_ib_mcg_detach;
  	dev->ib_dev.process_mad		= mlx5_ib_process_mad;
-	dev->ib_dev.create_mr		= mlx5_ib_create_mr;
+	dev->ib_dev.alloc_mr		= mlx5_ib_alloc_mr;
  	dev->ib_dev.alloc_fast_reg_mr	= mlx5_ib_alloc_fast_reg_mr;
  	dev->ib_dev.alloc_fast_reg_page_list = mlx5_ib_alloc_fast_reg_page_list;
  	dev->ib_dev.free_fast_reg_page_list  = mlx5_ib_free_fast_reg_page_list;
diff --git a/drivers/infiniband/hw/mlx5/mlx5_ib.h b/drivers/infiniband/hw/mlx5/mlx5_ib.h
index 537f42e..3030abe 100644
--- a/drivers/infiniband/hw/mlx5/mlx5_ib.h
+++ b/drivers/infiniband/hw/mlx5/mlx5_ib.h
@@ -572,8 +572,9 @@ struct ib_mr *mlx5_ib_reg_user_mr(struct ib_pd *pd, u64 start, u64 length,
  int mlx5_ib_update_mtt(struct mlx5_ib_mr *mr, u64 start_page_index,
  		       int npages, int zap);
  int mlx5_ib_dereg_mr(struct ib_mr *ibmr);
-struct ib_mr *mlx5_ib_create_mr(struct ib_pd *pd,
-				struct ib_mr_init_attr *mr_init_attr);
+struct ib_mr *mlx5_ib_alloc_mr(struct ib_pd *pd,
+			       enum ib_mr_type mr_type,
+			       u32 max_num_sg);
  struct ib_mr *mlx5_ib_alloc_fast_reg_mr(struct ib_pd *pd,
  					int max_page_list_len);
  struct ib_fast_reg_page_list *mlx5_ib_alloc_fast_reg_page_list(struct ib_device *ibdev,
diff --git a/drivers/infiniband/hw/mlx5/mr.c b/drivers/infiniband/hw/mlx5/mr.c
index 03cf74e..b0b68bb 100644
--- a/drivers/infiniband/hw/mlx5/mr.c
+++ b/drivers/infiniband/hw/mlx5/mr.c
@@ -1246,14 +1246,15 @@ int mlx5_ib_dereg_mr(struct ib_mr *ibmr)
  	return 0;
  }
  
-struct ib_mr *mlx5_ib_create_mr(struct ib_pd *pd,
-				struct ib_mr_init_attr *mr_init_attr)
+struct ib_mr *mlx5_ib_alloc_mr(struct ib_pd *pd,
+			       enum ib_mr_type mr_type,
+			       u32 max_num_sg)
  {
  	struct mlx5_ib_dev *dev = to_mdev(pd->device);
  	struct mlx5_create_mkey_mbox_in *in;
  	struct mlx5_ib_mr *mr;
  	int access_mode, err;
-	int ndescs = roundup(mr_init_attr->max_reg_descriptors, 4);
+	int ndescs = roundup(max_num_sg, 4);
  
  	mr = kzalloc(sizeof(*mr), GFP_KERNEL);
  	if (!mr)
@@ -1269,9 +1270,11 @@ struct ib_mr *mlx5_ib_create_mr(struct ib_pd *pd,
  	in->seg.xlt_oct_size = cpu_to_be32(ndescs);
  	in->seg.qpn_mkey7_0 = cpu_to_be32(0xffffff << 8);
  	in->seg.flags_pd = cpu_to_be32(to_mpd(pd)->pdn);
-	access_mode = MLX5_ACCESS_MODE_MTT;
  
-	if (mr_init_attr->flags & IB_MR_SIGNATURE_EN) {
+	if (mr_type == IB_MR_TYPE_MEM_REG) {
+		access_mode = MLX5_ACCESS_MODE_MTT;
+		in->seg.log2_page_size = PAGE_SHIFT;
+	} else if (mr_type == IB_MR_TYPE_SIGNATURE) {
  		u32 psv_index[2];
  
  		in->seg.flags_pd = cpu_to_be32(be32_to_cpu(in->seg.flags_pd) |
@@ -1297,6 +1300,10 @@ struct ib_mr *mlx5_ib_create_mr(struct ib_pd *pd,
  		mr->sig->sig_err_exists = false;
  		/* Next UMR, Arm SIGERR */
  		++mr->sig->sigerr_count;
+	} else {
+		mlx5_ib_warn(dev, "Invalid mr type %d\n", mr_type);
+		err = -EINVAL;
+		goto err_free_in;
  	}
  
  	in->seg.flags = MLX5_PERM_UMR_EN | access_mode;
diff --git a/drivers/infiniband/ulp/iser/iser_verbs.c b/drivers/infiniband/ulp/iser/iser_verbs.c
index 255321c..9bef5a7 100644
--- a/drivers/infiniband/ulp/iser/iser_verbs.c
+++ b/drivers/infiniband/ulp/iser/iser_verbs.c
@@ -284,9 +284,7 @@ iser_alloc_pi_ctx(struct ib_device *ib_device, struct ib_pd *pd,
  		  struct fast_reg_descriptor *desc)
  {
  	struct iser_pi_context *pi_ctx = NULL;
-	struct ib_mr_init_attr mr_init_attr = {.max_reg_descriptors = 2,
-					       .flags = IB_MR_SIGNATURE_EN};
-	int ret = 0;
+	int ret;
  
  	desc->pi_ctx = kzalloc(sizeof(*desc->pi_ctx), GFP_KERNEL);
  	if (!desc->pi_ctx)
@@ -309,7 +307,7 @@ iser_alloc_pi_ctx(struct ib_device *ib_device, struct ib_pd *pd,
  	}
  	desc->reg_indicators |= ISER_PROT_KEY_VALID;
  
-	pi_ctx->sig_mr = ib_create_mr(pd, &mr_init_attr);
+	pi_ctx->sig_mr = ib_alloc_mr(pd, IB_MR_TYPE_SIGNATURE, 2);
  	if (IS_ERR(pi_ctx->sig_mr)) {
  		ret = PTR_ERR(pi_ctx->sig_mr);
  		goto sig_mr_failure;
diff --git a/drivers/infiniband/ulp/isert/ib_isert.c b/drivers/infiniband/ulp/isert/ib_isert.c
index 559e6be..23a793a 100644
--- a/drivers/infiniband/ulp/isert/ib_isert.c
+++ b/drivers/infiniband/ulp/isert/ib_isert.c
@@ -497,7 +497,6 @@ isert_create_pi_ctx(struct fast_reg_descriptor *desc,
  		    struct ib_device *device,
  		    struct ib_pd *pd)
  {
-	struct ib_mr_init_attr mr_init_attr;
  	struct pi_context *pi_ctx;
  	int ret;
  
@@ -525,10 +524,7 @@ isert_create_pi_ctx(struct fast_reg_descriptor *desc,
  	}
  	desc->ind |= ISERT_PROT_KEY_VALID;
  
-	memset(&mr_init_attr, 0, sizeof(mr_init_attr));
-	mr_init_attr.max_reg_descriptors = 2;
-	mr_init_attr.flags |= IB_MR_SIGNATURE_EN;
-	pi_ctx->sig_mr = ib_create_mr(pd, &mr_init_attr);
+	pi_ctx->sig_mr = ib_alloc_mr(pd, IB_MR_TYPE_SIGNATURE, 2);
  	if (IS_ERR(pi_ctx->sig_mr)) {
  		isert_err("Failed to allocate signature enabled mr err=%ld\n",
  			  PTR_ERR(pi_ctx->sig_mr));
diff --git a/include/rdma/ib_verbs.h b/include/rdma/ib_verbs.h
index a534ee5..110044d 100644
--- a/include/rdma/ib_verbs.h
+++ b/include/rdma/ib_verbs.h
@@ -556,20 +556,18 @@ __attribute_const__ int ib_rate_to_mult(enum ib_rate rate);
   */
  __attribute_const__ int ib_rate_to_mbps(enum ib_rate rate);
  
-enum ib_mr_create_flags {
-	IB_MR_SIGNATURE_EN = 1,
-};
  
  /**
- * ib_mr_init_attr - Memory region init attributes passed to routine
- *     ib_create_mr.
- * @max_reg_descriptors: max number of registration descriptors that
- *     may be used with registration work requests.
- * @flags: MR creation flags bit mask.
+ * enum ib_mr_type - memory region type
+ * @IB_MR_TYPE_MEM_REG:       memory region that is used for
+ *                            normal registration
+ * @IB_MR_TYPE_SIGNATURE:     memory region that is used for
+ *                            signature operations (data-integrity
+ *                            capable regions)
   */
-struct ib_mr_init_attr {
-	int	    max_reg_descriptors;
-	u32	    flags;
+enum ib_mr_type {
+	IB_MR_TYPE_MEM_REG,
+	IB_MR_TYPE_SIGNATURE,
  };
  
  /**
@@ -1670,8 +1668,9 @@ struct ib_device {
  	int                        (*query_mr)(struct ib_mr *mr,
  					       struct ib_mr_attr *mr_attr);
  	int                        (*dereg_mr)(struct ib_mr *mr);
-	struct ib_mr *		   (*create_mr)(struct ib_pd *pd,
-						struct ib_mr_init_attr *mr_init_attr);
+	struct ib_mr *		   (*alloc_mr)(struct ib_pd *pd,
+					       enum ib_mr_type mr_type,
+					       u32 max_num_sg);
  	struct ib_mr *		   (*alloc_fast_reg_mr)(struct ib_pd *pd,
  					       int max_page_list_len);
  	struct ib_fast_reg_page_list * (*alloc_fast_reg_page_list)(struct ib_device *device,
@@ -2815,15 +2814,9 @@ int ib_query_mr(struct ib_mr *mr, struct ib_mr_attr *mr_attr);
   */
  int ib_dereg_mr(struct ib_mr *mr);
  
-
-/**
- * ib_create_mr - Allocates a memory region that may be used for
- *     signature handover operations.
- * @pd: The protection domain associated with the region.
- * @mr_init_attr: memory region init attributes.
- */
-struct ib_mr *ib_create_mr(struct ib_pd *pd,
-			   struct ib_mr_init_attr *mr_init_attr);
+struct ib_mr *ib_alloc_mr(struct ib_pd *pd,
+			  enum ib_mr_type mr_type,
+			  u32 max_num_sg);
  
  /**
   * ib_alloc_fast_reg_mr - Allocates memory region usable with the

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