Commit 5d5defd6 authored by Roi Dayan's avatar Roi Dayan Committed by Saeed Mahameed
Browse files

net/mlx5e: Add an option to create a shared mapping 



The shared mapping is identified by an id and type.

Signed-off-by: default avatarRoi Dayan <roid@nvidia.com>
Signed-off-by: default avatarSaeed Mahameed <saeedm@nvidia.com>
parent d0444254

drivers/net/ethernet/mellanox/mlx5/core/en/mapping.c

+45 −0
Original line number Diff line number Diff line
@@ -5,11 +5,15 @@ 
#include <linux/slab.h>

#include <linux/xarray.h>

#include <linux/hashtable.h>

#include <linux/refcount.h>



#include "mapping.h"



#define MAPPING_GRACE_PERIOD 2000



static LIST_HEAD(shared_ctx_list);

static DEFINE_MUTEX(shared_ctx_lock);



struct mapping_ctx {

	struct xarray xarray;

	DECLARE_HASHTABLE(ht, 8);
@@ -20,6 +24,10 @@ struct mapping_ctx { 
	struct delayed_work dwork;

	struct list_head pending_list;

	spinlock_t pending_list_lock; /* Guards pending list */

	u64 id;

	u8 type;

	struct list_head list;

	refcount_t refcount;

};



struct mapping_item {
@@ -205,11 +213,48 @@ mapping_create(size_t data_size, u32 max_id, bool delayed_removal) 
	mutex_init(&ctx->lock);

	xa_init_flags(&ctx->xarray, XA_FLAGS_ALLOC1);



	refcount_set(&ctx->refcount, 1);

	INIT_LIST_HEAD(&ctx->list);



	return ctx;

}



struct mapping_ctx *

mapping_create_for_id(u64 id, u8 type, size_t data_size, u32 max_id, bool delayed_removal)

{

	struct mapping_ctx *ctx;



	mutex_lock(&shared_ctx_lock);

	list_for_each_entry(ctx, &shared_ctx_list, list) {

		if (ctx->id == id && ctx->type == type) {

			if (refcount_inc_not_zero(&ctx->refcount))

				goto unlock;

			break;

		}

	}



	ctx = mapping_create(data_size, max_id, delayed_removal);

	if (IS_ERR(ctx))

		goto unlock;



	ctx->id = id;

	ctx->type = type;

	list_add(&ctx->list, &shared_ctx_list);



unlock:

	mutex_unlock(&shared_ctx_lock);

	return ctx;

}



void mapping_destroy(struct mapping_ctx *ctx)

{

	if (!refcount_dec_and_test(&ctx->refcount))

		return;



	mutex_lock(&shared_ctx_lock);

	list_del(&ctx->list);

	mutex_unlock(&shared_ctx_lock);



	mapping_flush_work(ctx);

	xa_destroy(&ctx->xarray);

	mutex_destroy(&ctx->lock);

drivers/net/ethernet/mellanox/mlx5/core/en/mapping.h

+5 −0
Original line number Diff line number Diff line
@@ -24,4 +24,9 @@ struct mapping_ctx *mapping_create(size_t data_size, u32 max_id, 
				   bool delayed_removal);

void mapping_destroy(struct mapping_ctx *ctx);



/* adds mapping with an id or get an existing mapping with the same id

 */

struct mapping_ctx *

mapping_create_for_id(u64 id, u8 type, size_t data_size, u32 max_id, bool delayed_removal);



#endif /* __MLX5_MAPPING_H__ */