[dpdk-dev] [PATCH v2 17/17] common/mlx5: remove doorbell allocation API

[Michael Baum <michaelba@nvidia.com>]

The mlx5_devx_dbr_page structure was used to allocate and release the
umem of the doorbells.
Since doorbell and buffer have used same umem, this structure is
useless.

Signed-off-by: Michael Baum <michaelba@nvidia.com>
Acked-by: Matan Azrad <matan@nvidia.com>
---
 drivers/common/mlx5/mlx5_common.c | 122 --------------------------------------
 drivers/common/mlx5/mlx5_common.h |  23 -------
 2 files changed, 145 deletions(-)

diff --git a/drivers/common/mlx5/mlx5_common.c b/drivers/common/mlx5/mlx5_common.c
index 0445132..c26a2cf 100644
--- a/drivers/common/mlx5/mlx5_common.c
+++ b/drivers/common/mlx5/mlx5_common.c
@@ -8,12 +8,10 @@
 
 #include <rte_errno.h>
 #include <rte_mempool.h>
-#include <rte_malloc.h>
 
 #include "mlx5_common.h"
 #include "mlx5_common_os.h"
 #include "mlx5_common_utils.h"
-#include "mlx5_malloc.h"
 #include "mlx5_common_pci.h"
 
 int mlx5_common_logtype;
@@ -126,126 +124,6 @@ static inline void mlx5_cpu_id(unsigned int level,
 }
 
 /**
- * Allocate page of door-bells and register it using DevX API.
- *
- * @param [in] ctx
- *   Pointer to the device context.
- *
- * @return
- *   Pointer to new page on success, NULL otherwise.
- */
-static struct mlx5_devx_dbr_page *
-mlx5_alloc_dbr_page(void *ctx)
-{
-	struct mlx5_devx_dbr_page *page;
-
-	/* Allocate space for door-bell page and management data. */
-	page = mlx5_malloc(MLX5_MEM_RTE | MLX5_MEM_ZERO,
-			   sizeof(struct mlx5_devx_dbr_page),
-			   RTE_CACHE_LINE_SIZE, SOCKET_ID_ANY);
-	if (!page) {
-		DRV_LOG(ERR, "cannot allocate dbr page");
-		return NULL;
-	}
-	/* Register allocated memory. */
-	page->umem = mlx5_glue->devx_umem_reg(ctx, page->dbrs,
-					      MLX5_DBR_PAGE_SIZE, 0);
-	if (!page->umem) {
-		DRV_LOG(ERR, "cannot umem reg dbr page");
-		mlx5_free(page);
-		return NULL;
-	}
-	return page;
-}
-
-/**
- * Find the next available door-bell, allocate new page if needed.
- *
- * @param [in] ctx
- *   Pointer to device context.
- * @param [in] head
- *   Pointer to the head of dbr pages list.
- * @param [out] dbr_page
- *   Door-bell page containing the page data.
- *
- * @return
- *   Door-bell address offset on success, a negative error value otherwise.
- */
-int64_t
-mlx5_get_dbr(void *ctx,  struct mlx5_dbr_page_list *head,
-	     struct mlx5_devx_dbr_page **dbr_page)
-{
-	struct mlx5_devx_dbr_page *page = NULL;
-	uint32_t i, j;
-
-	LIST_FOREACH(page, head, next)
-		if (page->dbr_count < MLX5_DBR_PER_PAGE)
-			break;
-	if (!page) { /* No page with free door-bell exists. */
-		page = mlx5_alloc_dbr_page(ctx);
-		if (!page) /* Failed to allocate new page. */
-			return (-1);
-		LIST_INSERT_HEAD(head, page, next);
-	}
-	/* Loop to find bitmap part with clear bit. */
-	for (i = 0;
-	     i < MLX5_DBR_BITMAP_SIZE && page->dbr_bitmap[i] == UINT64_MAX;
-	     i++)
-		; /* Empty. */
-	/* Find the first clear bit. */
-	MLX5_ASSERT(i < MLX5_DBR_BITMAP_SIZE);
-	j = rte_bsf64(~page->dbr_bitmap[i]);
-	page->dbr_bitmap[i] |= (UINT64_C(1) << j);
-	page->dbr_count++;
-	*dbr_page = page;
-	return (i * CHAR_BIT * sizeof(uint64_t) + j) * MLX5_DBR_SIZE;
-}
-
-/**
- * Release a door-bell record.
- *
- * @param [in] head
- *   Pointer to the head of dbr pages list.
- * @param [in] umem_id
- *   UMEM ID of page containing the door-bell record to release.
- * @param [in] offset
- *   Offset of door-bell record in page.
- *
- * @return
- *   0 on success, a negative error value otherwise.
- */
-int32_t
-mlx5_release_dbr(struct mlx5_dbr_page_list *head, uint32_t umem_id,
-		 uint64_t offset)
-{
-	struct mlx5_devx_dbr_page *page = NULL;
-	int ret = 0;
-
-	LIST_FOREACH(page, head, next)
-		/* Find the page this address belongs to. */
-		if (mlx5_os_get_umem_id(page->umem) == umem_id)
-			break;
-	if (!page)
-		return -EINVAL;
-	page->dbr_count--;
-	if (!page->dbr_count) {
-		/* Page not used, free it and remove from list. */
-		LIST_REMOVE(page, next);
-		if (page->umem)
-			ret = -mlx5_glue->devx_umem_dereg(page->umem);
-		mlx5_free(page);
-	} else {
-		/* Mark in bitmap that this door-bell is not in use. */
-		offset /= MLX5_DBR_SIZE;
-		int i = offset / 64;
-		int j = offset % 64;
-
-		page->dbr_bitmap[i] &= ~(UINT64_C(1) << j);
-	}
-	return ret;
-}
-
-/**
  * Allocate the User Access Region with DevX on specified device.
  *
  * @param [in] ctx
diff --git a/drivers/common/mlx5/mlx5_common.h b/drivers/common/mlx5/mlx5_common.h
index a484b74..e35188d 100644
--- a/drivers/common/mlx5/mlx5_common.h
+++ b/drivers/common/mlx5/mlx5_common.h
@@ -220,21 +220,6 @@ enum mlx5_class {
 };
 
 #define MLX5_DBR_SIZE RTE_CACHE_LINE_SIZE
-#define MLX5_DBR_PER_PAGE 64
-/* Must be >= CHAR_BIT * sizeof(uint64_t) */
-#define MLX5_DBR_PAGE_SIZE (MLX5_DBR_PER_PAGE * MLX5_DBR_SIZE)
-/* Page size must be >= 512. */
-#define MLX5_DBR_BITMAP_SIZE (MLX5_DBR_PER_PAGE / (CHAR_BIT * sizeof(uint64_t)))
-
-struct mlx5_devx_dbr_page {
-	/* Door-bell records, must be first member in structure. */
-	uint8_t dbrs[MLX5_DBR_PAGE_SIZE];
-	LIST_ENTRY(mlx5_devx_dbr_page) next; /* Pointer to the next element. */
-	void *umem;
-	uint32_t dbr_count; /* Number of door-bell records in use. */
-	/* 1 bit marks matching door-bell is in use. */
-	uint64_t dbr_bitmap[MLX5_DBR_BITMAP_SIZE];
-};
 
 /* devX creation object */
 struct mlx5_devx_obj {
@@ -249,19 +234,11 @@ struct mlx5_klm {
 	uint64_t address;
 };
 
-LIST_HEAD(mlx5_dbr_page_list, mlx5_devx_dbr_page);
-
 __rte_internal
 void mlx5_translate_port_name(const char *port_name_in,
 			      struct mlx5_switch_info *port_info_out);
 void mlx5_glue_constructor(void);
 __rte_internal
-int64_t mlx5_get_dbr(void *ctx,  struct mlx5_dbr_page_list *head,
-		     struct mlx5_devx_dbr_page **dbr_page);
-__rte_internal
-int32_t mlx5_release_dbr(struct mlx5_dbr_page_list *head, uint32_t umem_id,
-			 uint64_t offset);
-__rte_internal
 void *mlx5_devx_alloc_uar(void *ctx, int mapping);
 extern uint8_t haswell_broadwell_cpu;
 
-- 
1.8.3.1