[dpdk-dev] [PATCH 2/2] common/mlx5: move doorbell record to common

[Ori Kam <orika@mellanox.com>]

The creation of DBR can be used by a number of different
Mellanox PMDs. for example RegEx / Net / VDPA.

This commits moves the DBR creation and relase functions to common
folder.

Signed-off-by: Ori Kam <orika@mellanox.com>
Acked-by: Viacheslav Ovsiienko <viacheslavo@mellanox.com>
---
 drivers/common/mlx5/linux/mlx5_common_os.c      |   1 +
 drivers/common/mlx5/mlx5_common.c               | 122 ++++++++++++++++++++++++
 drivers/common/mlx5/mlx5_common.h               |  38 +++++++-
 drivers/common/mlx5/mlx5_devx_cmds.h            |  13 ---
 drivers/common/mlx5/rte_common_mlx5_version.map |   3 +
 drivers/net/mlx5/mlx5.c                         | 120 -----------------------
 drivers/net/mlx5/mlx5.h                         |  21 +---
 drivers/net/mlx5/mlx5_rxq.c                     |   6 +-
 8 files changed, 168 insertions(+), 156 deletions(-)

diff --git a/drivers/common/mlx5/linux/mlx5_common_os.c b/drivers/common/mlx5/linux/mlx5_common_os.c
index 1b71347..823a0b5 100644
--- a/drivers/common/mlx5/linux/mlx5_common_os.c
+++ b/drivers/common/mlx5/linux/mlx5_common_os.c
@@ -315,3 +315,4 @@
 		" libmlx5)");
 	mlx5_glue = NULL;
 }
+
diff --git a/drivers/common/mlx5/mlx5_common.c b/drivers/common/mlx5/mlx5_common.c
index db94d4a..693e2c6 100644
--- a/drivers/common/mlx5/mlx5_common.c
+++ b/drivers/common/mlx5/mlx5_common.c
@@ -7,8 +7,11 @@
 #include <stdio.h>
 
 #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"
 
 int mlx5_common_logtype;
@@ -150,3 +153,122 @@ static inline void mlx5_cpu_id(unsigned int level,
 #endif
 	haswell_broadwell_cpu = 0;
 }
+
+/**
+ * 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 = rte_calloc_socket(__func__, 1, 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");
+		rte_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 * 64) + j) * sizeof(uint64_t));
+}
+
+/**
+ * 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);
+		rte_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;
+}
diff --git a/drivers/common/mlx5/mlx5_common.h b/drivers/common/mlx5/mlx5_common.h
index 77f10e6..8b8f3a0 100644
--- a/drivers/common/mlx5/mlx5_common.h
+++ b/drivers/common/mlx5/mlx5_common.h
@@ -15,6 +15,7 @@
 #include <rte_devargs.h>
 
 #include "mlx5_prm.h"
+#include "mlx5_devx_cmds.h"
 
 
 /* Bit-field manipulation. */
@@ -207,6 +208,36 @@ enum mlx5_class {
 	MLX5_CLASS_INVALID,
 };
 
+#define MLX5_DBR_PAGE_SIZE 4096 /* Must be >= 512. */
+#define MLX5_DBR_SIZE 8
+#define MLX5_DBR_PER_PAGE (MLX5_DBR_PAGE_SIZE / MLX5_DBR_SIZE)
+#define MLX5_DBR_BITMAP_SIZE (MLX5_DBR_PER_PAGE / 64)
+
+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 {
+	void *obj; /* The DV object. */
+	int id; /* The object ID. */
+};
+
+/* UMR memory buffer used to define 1 entry in indirect mkey. */
+struct mlx5_klm {
+	uint32_t byte_count;
+	uint32_t mkey;
+	uint64_t address;
+};
+
+LIST_HEAD(mlx5_dbr_page_list, mlx5_devx_dbr_page);
+
 __rte_internal
 enum mlx5_class mlx5_class_get(struct rte_devargs *devargs);
 __rte_internal
@@ -214,7 +245,12 @@ void mlx5_translate_port_name(const char *port_name_in,
 			      struct mlx5_switch_info *port_info_out);
 void mlx5_glue_constructor(void);
 size_t mlx5_os_get_page_size(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);
 extern uint8_t haswell_broadwell_cpu;
 
 #endif /* RTE_PMD_MLX5_COMMON_H_ */
diff --git a/drivers/common/mlx5/mlx5_devx_cmds.h b/drivers/common/mlx5/mlx5_devx_cmds.h
index 49b174a..a2b2ad4 100644
--- a/drivers/common/mlx5/mlx5_devx_cmds.h
+++ b/drivers/common/mlx5/mlx5_devx_cmds.h
@@ -9,19 +9,6 @@
 #include "mlx5_prm.h"
 
 
-/* devX creation object */
-struct mlx5_devx_obj {
-	void *obj; /* The DV object. */
-	int id; /* The object ID. */
-};
-
-/* UMR memory buffer used to define 1 entry in indirect mkey. */
-struct mlx5_klm {
-	uint32_t byte_count;
-	uint32_t mkey;
-	uint64_t address;
-};
-
 /* This is limitation of libibverbs: in length variable type is u16. */
 #define MLX5_DEVX_MAX_KLM_ENTRIES ((UINT16_MAX - \
 		MLX5_ST_SZ_DW(create_mkey_in) * 4) / (MLX5_ST_SZ_DW(klm) * 4))
diff --git a/drivers/common/mlx5/rte_common_mlx5_version.map b/drivers/common/mlx5/rte_common_mlx5_version.map
index 350e771..3674083 100644
--- a/drivers/common/mlx5/rte_common_mlx5_version.map
+++ b/drivers/common/mlx5/rte_common_mlx5_version.map
@@ -31,6 +31,9 @@ INTERNAL {
 	mlx5_devx_cmd_query_virtq;
 	mlx5_devx_get_out_command_status;
 
+	mlx5_get_dbr;
+	mlx5_release_dbr;
+
 	mlx5_mp_init_primary;
 	mlx5_mp_uninit_primary;
 	mlx5_mp_init_secondary;
diff --git a/drivers/net/mlx5/mlx5.c b/drivers/net/mlx5/mlx5.c
index d914b10..8b5c967 100644
--- a/drivers/net/mlx5/mlx5.c
+++ b/drivers/net/mlx5/mlx5.c
@@ -1664,126 +1664,6 @@ struct mlx5_dev_ctx_shared *
 	DRV_LOG(DEBUG, "metadata reg_c0 mask %08X", sh->dv_regc0_mask);
 }
 
-/**
- * Allocate page of door-bells and register it using DevX API.
- *
- * @param [in] dev
- *   Pointer to Ethernet device.
- *
- * @return
- *   Pointer to new page on success, NULL otherwise.
- */
-static struct mlx5_devx_dbr_page *
-mlx5_alloc_dbr_page(struct rte_eth_dev *dev)
-{
-	struct mlx5_priv *priv = dev->data->dev_private;
-	struct mlx5_devx_dbr_page *page;
-
-	/* Allocate space for door-bell page and management data. */
-	page = rte_calloc_socket(__func__, 1, sizeof(struct mlx5_devx_dbr_page),
-				 RTE_CACHE_LINE_SIZE, dev->device->numa_node);
-	if (!page) {
-		DRV_LOG(ERR, "port %u cannot allocate dbr page",
-			dev->data->port_id);
-		return NULL;
-	}
-	/* Register allocated memory. */
-	page->umem = mlx5_glue->devx_umem_reg(priv->sh->ctx, page->dbrs,
-					      MLX5_DBR_PAGE_SIZE, 0);
-	if (!page->umem) {
-		DRV_LOG(ERR, "port %u cannot umem reg dbr page",
-			dev->data->port_id);
-		rte_free(page);
-		return NULL;
-	}
-	return page;
-}
-
-/**
- * Find the next available door-bell, allocate new page if needed.
- *
- * @param [in] dev
- *   Pointer to Ethernet device.
- * @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(struct rte_eth_dev *dev, struct mlx5_devx_dbr_page **dbr_page)
-{
-	struct mlx5_priv *priv = dev->data->dev_private;
-	struct mlx5_devx_dbr_page *page = NULL;
-	uint32_t i, j;
-
-	LIST_FOREACH(page, &priv->dbrpgs, next)
-		if (page->dbr_count < MLX5_DBR_PER_PAGE)
-			break;
-	if (!page) { /* No page with free door-bell exists. */
-		page = mlx5_alloc_dbr_page(dev);
-		if (!page) /* Failed to allocate new page. */
-			return (-1);
-		LIST_INSERT_HEAD(&priv->dbrpgs, 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 * 64) + j) * sizeof(uint64_t));
-}
-
-/**
- * Release a door-bell record.
- *
- * @param [in] dev
- *   Pointer to Ethernet device.
- * @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 rte_eth_dev *dev, uint32_t umem_id, uint64_t offset)
-{
-	struct mlx5_priv *priv = dev->data->dev_private;
-	struct mlx5_devx_dbr_page *page = NULL;
-	int ret = 0;
-
-	LIST_FOREACH(page, &priv->dbrpgs, 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);
-		rte_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;
-}
-
 int
 rte_pmd_mlx5_get_dyn_flag_names(char *names[], unsigned int n)
 {
diff --git a/drivers/net/mlx5/mlx5.h b/drivers/net/mlx5/mlx5.h
index 96c1eb1..5e10272 100644
--- a/drivers/net/mlx5/mlx5.h
+++ b/drivers/net/mlx5/mlx5.h
@@ -500,21 +500,6 @@ struct mlx5_flow_tbl_resource {
 #define MLX5_MAX_TABLES_EXTERNAL (MLX5_MAX_TABLES - 3)
 #define MLX5_MAX_TABLES_FDB UINT16_MAX
 
-#define MLX5_DBR_PAGE_SIZE 4096 /* Must be >= 512. */
-#define MLX5_DBR_SIZE 8
-#define MLX5_DBR_PER_PAGE (MLX5_DBR_PAGE_SIZE / MLX5_DBR_SIZE)
-#define MLX5_DBR_BITMAP_SIZE (MLX5_DBR_PER_PAGE / 64)
-
-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];
-};
-
 /* ID generation structure. */
 struct mlx5_flow_id_pool {
 	uint32_t *free_arr; /**< Pointer to the a array of free values. */
@@ -655,7 +640,7 @@ struct mlx5_priv {
 	/* Context for Verbs allocator. */
 	int nl_socket_rdma; /* Netlink socket (NETLINK_RDMA). */
 	int nl_socket_route; /* Netlink socket (NETLINK_ROUTE). */
-	LIST_HEAD(dbrpage, mlx5_devx_dbr_page) dbrpgs; /* Door-bell pages. */
+	struct mlx5_dbr_page_list dbrpgs; /* Door-bell pages. */
 	struct mlx5_nl_vlan_vmwa_context *vmwa_context; /* VLAN WA context. */
 	struct mlx5_flow_id_pool *qrss_id_pool;
 	struct mlx5_hlist *mreg_cp_tbl;
@@ -682,10 +667,6 @@ struct mlx5_priv {
 
 int mlx5_getenv_int(const char *);
 int mlx5_proc_priv_init(struct rte_eth_dev *dev);
-int64_t mlx5_get_dbr(struct rte_eth_dev *dev,
-		     struct mlx5_devx_dbr_page **dbr_page);
-int32_t mlx5_release_dbr(struct rte_eth_dev *dev, uint32_t umem_id,
-			 uint64_t offset);
 int mlx5_udp_tunnel_port_add(struct rte_eth_dev *dev,
 			      struct rte_eth_udp_tunnel *udp_tunnel);
 uint16_t mlx5_eth_find_next(uint16_t port_id, struct rte_pci_device *pci_dev);
diff --git a/drivers/net/mlx5/mlx5_rxq.c b/drivers/net/mlx5/mlx5_rxq.c
index efd1e3f..bd0037b 100644
--- a/drivers/net/mlx5/mlx5_rxq.c
+++ b/drivers/net/mlx5/mlx5_rxq.c
@@ -1414,7 +1414,8 @@ struct mlx5_rxq_obj *
 		struct mlx5_devx_dbr_page *dbr_page;
 		int64_t dbr_offset;
 
-		dbr_offset = mlx5_get_dbr(dev, &dbr_page);
+		dbr_offset = mlx5_get_dbr(priv->sh->ctx, &priv->dbrpgs,
+					  &dbr_page);
 		if (dbr_offset < 0)
 			goto error;
 		rxq_ctrl->dbr_offset = dbr_offset;
@@ -2102,7 +2103,8 @@ struct mlx5_rxq_ctrl *
 		rxq_ctrl->obj = NULL;
 	if (rte_atomic32_dec_and_test(&rxq_ctrl->refcnt)) {
 		if (rxq_ctrl->dbr_umem_id_valid)
-			claim_zero(mlx5_release_dbr(dev, rxq_ctrl->dbr_umem_id,
+			claim_zero(mlx5_release_dbr(&priv->dbrpgs,
+						    rxq_ctrl->dbr_umem_id,
 						    rxq_ctrl->dbr_offset));
 		if (rxq_ctrl->type == MLX5_RXQ_TYPE_STANDARD)
 			mlx5_mr_btree_free(&rxq_ctrl->rxq.mr_ctrl.cache_bh);
-- 
1.8.3.1