Commit bc9f6e94 authored by Petr Machata's avatar Petr Machata Committed by David S. Miller
Browse files

mlxsw: spectrum_buffers: Calculate the size of the main pool 



Instead of hard-coding the size of the largest pool, calculate it from the
reported guaranteed shared buffer size and sizes of other pools (currently
only the CPU port pool).

Signed-off-by: default avatarPetr Machata <petrm@mellanox.com>
Signed-off-by: default avatarIdo Schimmel <idosch@mellanox.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 914c4fc1

drivers/net/ethernet/mellanox/mlxsw/spectrum_buffers.c

+34 −12
Original line number Diff line number Diff line
@@ -35,6 +35,7 @@ struct mlxsw_sp_sb_cm { 
};



#define MLXSW_SP_SB_INFI -1U

#define MLXSW_SP_SB_REST -2U



struct mlxsw_sp_sb_pm {

	u32 min_buff;
@@ -421,19 +422,16 @@ static void mlxsw_sp_sb_ports_fini(struct mlxsw_sp *mlxsw_sp) 
		.freeze_size = _freeze_size,				\

	}



#define MLXSW_SP1_SB_PR_INGRESS_SIZE	13768608

#define MLXSW_SP1_SB_PR_EGRESS_SIZE	13768608

#define MLXSW_SP1_SB_PR_CPU_SIZE	(256 * 1000)



/* Order according to mlxsw_sp1_sb_pool_dess */

static const struct mlxsw_sp_sb_pr mlxsw_sp1_sb_prs[] = {

	MLXSW_SP_SB_PR(MLXSW_REG_SBPR_MODE_DYNAMIC,

		       MLXSW_SP1_SB_PR_INGRESS_SIZE),

	MLXSW_SP_SB_PR(MLXSW_REG_SBPR_MODE_DYNAMIC, MLXSW_SP_SB_REST),

	MLXSW_SP_SB_PR(MLXSW_REG_SBPR_MODE_DYNAMIC, 0),

	MLXSW_SP_SB_PR(MLXSW_REG_SBPR_MODE_DYNAMIC, 0),

	MLXSW_SP_SB_PR(MLXSW_REG_SBPR_MODE_DYNAMIC, 0),

	MLXSW_SP_SB_PR_EXT(MLXSW_REG_SBPR_MODE_DYNAMIC,

			   MLXSW_SP1_SB_PR_EGRESS_SIZE, true, false),

	MLXSW_SP_SB_PR_EXT(MLXSW_REG_SBPR_MODE_DYNAMIC, MLXSW_SP_SB_REST,

			   true, false),

	MLXSW_SP_SB_PR(MLXSW_REG_SBPR_MODE_DYNAMIC, 0),

	MLXSW_SP_SB_PR(MLXSW_REG_SBPR_MODE_DYNAMIC, 0),

	MLXSW_SP_SB_PR(MLXSW_REG_SBPR_MODE_DYNAMIC, 0),
@@ -445,19 +443,16 @@ static const struct mlxsw_sp_sb_pr mlxsw_sp1_sb_prs[] = { 
			   MLXSW_SP1_SB_PR_CPU_SIZE, true, false),

};



#define MLXSW_SP2_SB_PR_INGRESS_SIZE	34084800

#define MLXSW_SP2_SB_PR_EGRESS_SIZE	34084800

#define MLXSW_SP2_SB_PR_CPU_SIZE	(256 * 1000)



/* Order according to mlxsw_sp2_sb_pool_dess */

static const struct mlxsw_sp_sb_pr mlxsw_sp2_sb_prs[] = {

	MLXSW_SP_SB_PR(MLXSW_REG_SBPR_MODE_DYNAMIC,

		       MLXSW_SP2_SB_PR_INGRESS_SIZE),

	MLXSW_SP_SB_PR(MLXSW_REG_SBPR_MODE_DYNAMIC, MLXSW_SP_SB_REST),

	MLXSW_SP_SB_PR(MLXSW_REG_SBPR_MODE_STATIC, 0),

	MLXSW_SP_SB_PR(MLXSW_REG_SBPR_MODE_STATIC, 0),

	MLXSW_SP_SB_PR(MLXSW_REG_SBPR_MODE_STATIC, 0),

	MLXSW_SP_SB_PR_EXT(MLXSW_REG_SBPR_MODE_DYNAMIC,

			   MLXSW_SP2_SB_PR_EGRESS_SIZE, true, false),

	MLXSW_SP_SB_PR_EXT(MLXSW_REG_SBPR_MODE_DYNAMIC, MLXSW_SP_SB_REST,

			   true, false),

	MLXSW_SP_SB_PR(MLXSW_REG_SBPR_MODE_STATIC, 0),

	MLXSW_SP_SB_PR(MLXSW_REG_SBPR_MODE_STATIC, 0),

	MLXSW_SP_SB_PR(MLXSW_REG_SBPR_MODE_STATIC, 0),
@@ -471,11 +466,33 @@ static const struct mlxsw_sp_sb_pr mlxsw_sp2_sb_prs[] = { 


static int mlxsw_sp_sb_prs_init(struct mlxsw_sp *mlxsw_sp,

				const struct mlxsw_sp_sb_pr *prs,

				const struct mlxsw_sp_sb_pool_des *pool_dess,

				size_t prs_len)

{

	/* Round down, unlike mlxsw_sp_bytes_cells(). */

	u32 sb_cells = mlxsw_sp->sb->sb_size / mlxsw_sp->sb->cell_size;

	u32 rest_cells[2] = {sb_cells, sb_cells};

	int i;

	int err;



	/* Calculate how much space to give to the "REST" pools in either

	 * direction.

	 */

	for (i = 0; i < prs_len; i++) {

		enum mlxsw_reg_sbxx_dir dir = pool_dess[i].dir;

		u32 size = prs[i].size;

		u32 size_cells;



		if (size == MLXSW_SP_SB_INFI || size == MLXSW_SP_SB_REST)

			continue;



		size_cells = mlxsw_sp_bytes_cells(mlxsw_sp, size);

		if (WARN_ON_ONCE(size_cells > rest_cells[dir]))

			continue;



		rest_cells[dir] -= size_cells;

	}



	for (i = 0; i < prs_len; i++) {

		u32 size = prs[i].size;

		u32 size_cells;
@@ -483,6 +500,10 @@ static int mlxsw_sp_sb_prs_init(struct mlxsw_sp *mlxsw_sp, 
		if (size == MLXSW_SP_SB_INFI) {

			err = mlxsw_sp_sb_pr_write(mlxsw_sp, i, prs[i].mode,

						   0, true);

		} else if (size == MLXSW_SP_SB_REST) {

			size_cells = rest_cells[pool_dess[i].dir];

			err = mlxsw_sp_sb_pr_write(mlxsw_sp, i, prs[i].mode,

						   size_cells, false);

		} else {

			size_cells = mlxsw_sp_bytes_cells(mlxsw_sp, size);

			err = mlxsw_sp_sb_pr_write(mlxsw_sp, i, prs[i].mode,
@@ -926,6 +947,7 @@ int mlxsw_sp_buffers_init(struct mlxsw_sp *mlxsw_sp) 
	if (err)

		goto err_sb_ports_init;

	err = mlxsw_sp_sb_prs_init(mlxsw_sp, mlxsw_sp->sb_vals->prs,

				   mlxsw_sp->sb_vals->pool_dess,

				   mlxsw_sp->sb_vals->pool_count);

	if (err)

		goto err_sb_prs_init;

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