diff mbox series

[for-next,5/7] RDMA/bnxt_re: Update alloc_page uapi for pacing

Message ID 1687534717-17968-6-git-send-email-selvin.xavier@broadcom.com (mailing list archive)
State Superseded
Headers show
Series Doorbell Drop Prevention | expand

Commit Message

Selvin Xavier June 23, 2023, 3:38 p.m. UTC 
From: Chandramohan Akula <chandramohan.akula@broadcom.com>

Update the alloc_page uapi functionality for handling the
mapping of doorbell pacing shared page and bar address.

Signed-off-by: Chandramohan Akula <chandramohan.akula@broadcom.com>
Signed-off-by: Selvin Xavier <selvin.xavier@broadcom.com>
---
 drivers/infiniband/hw/bnxt_re/ib_verbs.c | 34 ++++++++++++++++++++++++++++----
 drivers/infiniband/hw/bnxt_re/ib_verbs.h |  2 ++
 include/uapi/rdma/bnxt_re-abi.h          |  2 ++
 3 files changed, 34 insertions(+), 4 deletions(-)
diff mbox series

Patch

diff --git a/drivers/infiniband/hw/bnxt_re/ib_verbs.c b/drivers/infiniband/hw/bnxt_re/ib_verbs.c
index 24040a8..229c2c4 100644
--- a/drivers/infiniband/hw/bnxt_re/ib_verbs.c
+++ b/drivers/infiniband/hw/bnxt_re/ib_verbs.c
@@ -564,6 +564,8 @@  bnxt_re_mmap_entry_insert(struct bnxt_re_ucontext *uctx, u64 mem_offset,
 		break;
 	case BNXT_RE_MMAP_UC_DB:
 	case BNXT_RE_MMAP_WC_DB:
+	case BNXT_RE_MMAP_DBR_BAR:
+	case BNXT_RE_MMAP_DBR_PAGE:
 		ret = rdma_user_mmap_entry_insert(&uctx->ib_uctx,
 						  &entry->rdma_entry, PAGE_SIZE);
 		break;
@@ -4150,6 +4152,18 @@  int bnxt_re_mmap(struct ib_ucontext *ib_uctx, struct vm_area_struct *vma)
 	case BNXT_RE_MMAP_SH_PAGE:
 		ret = vm_insert_page(vma, vma->vm_start, virt_to_page(uctx->shpg));
 		break;
+	case BNXT_RE_MMAP_DBR_BAR:
+		pfn = bnxt_entry->mem_offset >> PAGE_SHIFT;
+		ret = rdma_user_mmap_io(ib_uctx, vma, pfn, PAGE_SIZE,
+					pgprot_noncached(vma->vm_page_prot),
+					rdma_entry);
+		break;
+	case BNXT_RE_MMAP_DBR_PAGE:
+		/* Driver doesn't expect write access for user space */
+		if (vma->vm_flags & VM_WRITE)
+			return -EFAULT;
+		ret = vm_insert_page(vma, vma->vm_start, virt_to_page(bnxt_entry->mem_offset));
+		break;
 	default:
 		ret = -EINVAL;
 		break;
@@ -4181,7 +4195,7 @@  static int UVERBS_HANDLER(BNXT_RE_METHOD_ALLOC_PAGE)(struct uverbs_attr_bundle *
 	u64 mmap_offset;
 	u32 length;
 	u32 dpi;
-	u64 dbr;
+	u64 addr;
 	int err;
 
 	uctx = container_of(ib_uverbs_get_ucontext(attrs), struct bnxt_re_ucontext, ib_uctx);
@@ -4203,19 +4217,28 @@  static int UVERBS_HANDLER(BNXT_RE_METHOD_ALLOC_PAGE)(struct uverbs_attr_bundle *
 				return -ENOMEM;
 			length = PAGE_SIZE;
 			dpi = uctx->wcdpi.dpi;
-			dbr = (u64)uctx->wcdpi.umdbr;
+			addr = (u64)uctx->wcdpi.umdbr;
 			mmap_flag = BNXT_RE_MMAP_WC_DB;
 		} else {
 			return -EINVAL;
 		}
-
+		break;
+	case BNXT_RE_ALLOC_DBR_BAR_PAGE:
+		length = PAGE_SIZE;
+		addr = (u64)rdev->pacing.dbr_bar_addr;
+		mmap_flag = BNXT_RE_MMAP_DBR_BAR;
 		break;
 
+	case BNXT_RE_ALLOC_DBR_PAGE:
+		length = PAGE_SIZE;
+		addr = (u64)rdev->pacing.dbr_page;
+		mmap_flag = BNXT_RE_MMAP_DBR_PAGE;
+		break;
 	default:
 		return -EOPNOTSUPP;
 	}
 
-	entry = bnxt_re_mmap_entry_insert(uctx, dbr, mmap_flag, &mmap_offset);
+	entry = bnxt_re_mmap_entry_insert(uctx, addr, mmap_flag, &mmap_offset);
 	if (IS_ERR(entry))
 		return PTR_ERR(entry);
 
@@ -4255,6 +4278,9 @@  static int alloc_page_obj_cleanup(struct ib_uobject *uobject,
 			uctx->wcdpi.dbr = NULL;
 		}
 		break;
+	case BNXT_RE_MMAP_DBR_BAR:
+	case BNXT_RE_MMAP_DBR_PAGE:
+		break;
 	default:
 		goto exit;
 	}
diff --git a/drivers/infiniband/hw/bnxt_re/ib_verbs.h b/drivers/infiniband/hw/bnxt_re/ib_verbs.h
index 32d9e9d..f392a09 100644
--- a/drivers/infiniband/hw/bnxt_re/ib_verbs.h
+++ b/drivers/infiniband/hw/bnxt_re/ib_verbs.h
@@ -146,6 +146,8 @@  enum bnxt_re_mmap_flag {
 	BNXT_RE_MMAP_SH_PAGE,
 	BNXT_RE_MMAP_UC_DB,
 	BNXT_RE_MMAP_WC_DB,
+	BNXT_RE_MMAP_DBR_PAGE,
+	BNXT_RE_MMAP_DBR_BAR,
 };
 
 struct bnxt_re_user_mmap_entry {
diff --git a/include/uapi/rdma/bnxt_re-abi.h b/include/uapi/rdma/bnxt_re-abi.h
index 060bf1d..78a324f 100644
--- a/include/uapi/rdma/bnxt_re-abi.h
+++ b/include/uapi/rdma/bnxt_re-abi.h
@@ -136,6 +136,8 @@  enum bnxt_re_objects {
 
 enum bnxt_re_alloc_page_type {
 	BNXT_RE_ALLOC_WC_PAGE = 0,
+	BNXT_RE_ALLOC_DBR_BAR_PAGE,
+	BNXT_RE_ALLOC_DBR_PAGE,
 };
 
 enum bnxt_re_var_alloc_page_attrs {