All of lore.kernel.org
 help / color / mirror / Atom feed
From: Ido Schimmel <idosch@idosch.org>
To: netdev@vger.kernel.org
Cc: davem@davemloft.net, jakub.kicinski@netronome.com,
	jiri@mellanox.com, petrm@mellanox.com, mlxsw@mellanox.com,
	Ido Schimmel <idosch@mellanox.com>
Subject: [PATCH net-next 2/2] mlxsw: spectrum_buffers: Calculate the size of the main pool
Date: Wed, 23 Oct 2019 09:05:00 +0300	[thread overview]
Message-ID: <20191023060500.19709-3-idosch@idosch.org> (raw)
In-Reply-To: <20191023060500.19709-1-idosch@idosch.org>

From: Petr Machata <petrm@mellanox.com>

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: Petr Machata <petrm@mellanox.com>
Signed-off-by: Ido Schimmel <idosch@mellanox.com>
---
 .../mellanox/mlxsw/spectrum_buffers.c         | 46 ++++++++++++++-----
 1 file changed, 34 insertions(+), 12 deletions(-)

diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum_buffers.c b/drivers/net/ethernet/mellanox/mlxsw/spectrum_buffers.c
index 637151682cf2..5fd9a72c8471 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/spectrum_buffers.c
+++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum_buffers.c
@@ -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;
-- 
2.21.0


  parent reply	other threads:[~2019-10-23  6:05 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-10-23  6:04 [PATCH net-next 0/2] mlxsw: Update main pool computation and pool size limits Ido Schimmel
2019-10-23  6:04 ` [PATCH net-next 1/2] mlxsw: spectrum: Use guaranteed buffer size as pool size limit Ido Schimmel
2019-10-23  6:05 ` Ido Schimmel [this message]
2019-10-30  3:31   ` [PATCH net-next 2/2] mlxsw: spectrum_buffers: Calculate the size of the main pool Nathan Chancellor
2019-10-30  7:57     ` Ido Schimmel
2019-10-24  4:31 ` [PATCH net-next 0/2] mlxsw: Update main pool computation and pool size limits David Miller

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20191023060500.19709-3-idosch@idosch.org \
    --to=idosch@idosch.org \
    --cc=davem@davemloft.net \
    --cc=idosch@mellanox.com \
    --cc=jakub.kicinski@netronome.com \
    --cc=jiri@mellanox.com \
    --cc=mlxsw@mellanox.com \
    --cc=netdev@vger.kernel.org \
    --cc=petrm@mellanox.com \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body. 
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.