[PATCH net-next 0/3] net/mlx5: HWS single flow counter support

[PATCH net-next 0/3] net/mlx5: HWS single flow counter support

[Tariq Toukan]

Hi,

This small series refactors the flow counter bulk initialization code
and extends it so that single flow counters are also usable by hardware
steering (HWS) rules.

Patches 1-2 refactor the bulk init path: first by factoring out common
flow counter bulk initialization into mlx5_fc_bulk_init(), then by
splitting the bitmap allocation into mlx5_fs_bulk_bitmap_alloc(), with
no functional changes.

Patch 3 initializes bulk data for counters allocated via
mlx5_fc_single_alloc(), so they can be safely used by HWS rules.

Regards,
Tariq

Mark Bloch (2):
  net/mlx5: fs, factor out flow counter bulk init
  net/mlx5: fs, split bulk init

Moshe Shemesh (1):
  net/mlx5: Initialize bulk for single flow counters

 .../net/ethernet/mellanox/mlx5/core/fs_core.h |  3 +-
 .../ethernet/mellanox/mlx5/core/fs_counters.c | 47 ++++++++++++++-----
 .../net/ethernet/mellanox/mlx5/core/fs_pool.c | 16 ++++---
 .../net/ethernet/mellanox/mlx5/core/fs_pool.h |  5 +-
 .../mlx5/core/steering/hws/fs_hws_pools.c     |  8 +++-
 5 files changed, 55 insertions(+), 24 deletions(-)


base-commit: 60d8484c4cec811f5ceb6550655df74490d1a165
-- 
2.31.1

[PATCH net-next 1/3] net/mlx5: fs, factor out flow counter bulk init

[Tariq Toukan]

From: Mark Bloch <mbloch@nvidia.com>

Add mlx5_fc_bulk_init() to handle bulk initialization of flow counters.
This change does not alter any logic, but refactors the code to remove
duplicate initialization logic by centralizing it in a single function.

Signed-off-by: Mark Bloch <mbloch@nvidia.com>
Signed-off-by: Moshe Shemesh <moshe@nvidia.com>
Reviewed-by: Yevgeny Kliteynik <kliteyn@nvidia.com>
Signed-off-by: Tariq Toukan <tariqt@nvidia.com>
---
 .../ethernet/mellanox/mlx5/core/fs_counters.c    | 16 ++++++++++------
 1 file changed, 10 insertions(+), 6 deletions(-)

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/fs_counters.c b/drivers/net/ethernet/mellanox/mlx5/core/fs_counters.c
index 83001eda3884..e14570a3d492 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/fs_counters.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/fs_counters.c
@@ -421,6 +421,13 @@ static void mlx5_fc_init(struct mlx5_fc *counter, struct mlx5_fc_bulk *bulk,
 	counter->id = id;
 }
 
+static void mlx5_fc_bulk_init(struct mlx5_fc_bulk *fc_bulk, u32 base_id)
+{
+	fc_bulk->base_id = base_id;
+	refcount_set(&fc_bulk->hws_data.hws_action_refcount, 0);
+	mutex_init(&fc_bulk->hws_data.lock);
+}
+
 u32 mlx5_fc_get_base_id(struct mlx5_fc *counter)
 {
 	return counter->bulk->base_id;
@@ -447,12 +454,11 @@ static struct mlx5_fs_bulk *mlx5_fc_bulk_create(struct mlx5_core_dev *dev,
 
 	if (mlx5_cmd_fc_bulk_alloc(dev, alloc_bitmask, &base_id))
 		goto fs_bulk_cleanup;
-	fc_bulk->base_id = base_id;
+
+	mlx5_fc_bulk_init(fc_bulk, base_id);
 	for (i = 0; i < bulk_len; i++)
 		mlx5_fc_init(&fc_bulk->fcs[i], fc_bulk, base_id + i);
 
-	refcount_set(&fc_bulk->hws_data.hws_action_refcount, 0);
-	mutex_init(&fc_bulk->hws_data.lock);
 	return &fc_bulk->fs_bulk;
 
 fs_bulk_cleanup:
@@ -560,10 +566,8 @@ mlx5_fc_local_create(u32 counter_id, u32 offset, u32 bulk_size)
 
 	counter->type = MLX5_FC_TYPE_LOCAL;
 	counter->id = counter_id;
-	fc_bulk->base_id = counter_id - offset;
 	fc_bulk->fs_bulk.bulk_len = bulk_size;
-	refcount_set(&fc_bulk->hws_data.hws_action_refcount, 0);
-	mutex_init(&fc_bulk->hws_data.lock);
+	mlx5_fc_bulk_init(fc_bulk, counter_id - offset);
 	counter->bulk = fc_bulk;
 	refcount_set(&counter->fc_local_refcount, 1);
 	return counter;
-- 
2.31.1

[PATCH net-next 2/3] net/mlx5: fs, split bulk init

[Tariq Toukan]

From: Mark Bloch <mbloch@nvidia.com>

Refactor mlx5_fs_bulk_init() by moving bitmap allocation logic into a
new helper function mlx5_fs_bulk_bitmap_alloc(). This change does not
alter any logic.

Signed-off-by: Mark Bloch <mbloch@nvidia.com>
Signed-off-by: Moshe Shemesh <moshe@nvidia.com>
Reviewed-by: Yevgeny Kliteynik <kliteyn@nvidia.com>
Signed-off-by: Tariq Toukan <tariqt@nvidia.com>
---
 .../ethernet/mellanox/mlx5/core/fs_counters.c    |  6 ++++--
 .../net/ethernet/mellanox/mlx5/core/fs_pool.c    | 16 ++++++++++------
 .../net/ethernet/mellanox/mlx5/core/fs_pool.h    |  5 +++--
 .../mlx5/core/steering/hws/fs_hws_pools.c        |  8 ++++++--
 4 files changed, 23 insertions(+), 12 deletions(-)

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/fs_counters.c b/drivers/net/ethernet/mellanox/mlx5/core/fs_counters.c
index e14570a3d492..14539a20a60f 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/fs_counters.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/fs_counters.c
@@ -449,7 +449,9 @@ static struct mlx5_fs_bulk *mlx5_fc_bulk_create(struct mlx5_core_dev *dev,
 	if (!fc_bulk)
 		return NULL;
 
-	if (mlx5_fs_bulk_init(dev, &fc_bulk->fs_bulk, bulk_len))
+	mlx5_fs_bulk_init(&fc_bulk->fs_bulk, bulk_len);
+
+	if (mlx5_fs_bulk_bitmap_alloc(dev, &fc_bulk->fs_bulk))
 		goto fc_bulk_free;
 
 	if (mlx5_cmd_fc_bulk_alloc(dev, alloc_bitmask, &base_id))
@@ -566,7 +568,7 @@ mlx5_fc_local_create(u32 counter_id, u32 offset, u32 bulk_size)
 
 	counter->type = MLX5_FC_TYPE_LOCAL;
 	counter->id = counter_id;
-	fc_bulk->fs_bulk.bulk_len = bulk_size;
+	mlx5_fs_bulk_init(&fc_bulk->fs_bulk, bulk_size);
 	mlx5_fc_bulk_init(fc_bulk, counter_id - offset);
 	counter->bulk = fc_bulk;
 	refcount_set(&counter->fc_local_refcount, 1);
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/fs_pool.c b/drivers/net/ethernet/mellanox/mlx5/core/fs_pool.c
index f6c226664602..faa519254316 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/fs_pool.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/fs_pool.c
@@ -4,23 +4,27 @@
 #include <mlx5_core.h>
 #include "fs_pool.h"
 
-int mlx5_fs_bulk_init(struct mlx5_core_dev *dev, struct mlx5_fs_bulk *fs_bulk,
-		      int bulk_len)
+int mlx5_fs_bulk_bitmap_alloc(struct mlx5_core_dev *dev,
+			      struct mlx5_fs_bulk *fs_bulk)
 {
 	int i;
 
-	fs_bulk->bitmask = kvcalloc(BITS_TO_LONGS(bulk_len), sizeof(unsigned long),
-				    GFP_KERNEL);
+	fs_bulk->bitmask = kvcalloc(BITS_TO_LONGS(fs_bulk->bulk_len),
+				    sizeof(unsigned long), GFP_KERNEL);
 	if (!fs_bulk->bitmask)
 		return -ENOMEM;
 
-	fs_bulk->bulk_len = bulk_len;
-	for (i = 0; i < bulk_len; i++)
+	for (i = 0; i < fs_bulk->bulk_len; i++)
 		set_bit(i, fs_bulk->bitmask);
 
 	return 0;
 }
 
+void mlx5_fs_bulk_init(struct mlx5_fs_bulk *fs_bulk, int bulk_len)
+{
+	fs_bulk->bulk_len = bulk_len;
+}
+
 void mlx5_fs_bulk_cleanup(struct mlx5_fs_bulk *fs_bulk)
 {
 	kvfree(fs_bulk->bitmask);
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/fs_pool.h b/drivers/net/ethernet/mellanox/mlx5/core/fs_pool.h
index f04ec3107498..4deb66479d16 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/fs_pool.h
+++ b/drivers/net/ethernet/mellanox/mlx5/core/fs_pool.h
@@ -39,8 +39,9 @@ struct mlx5_fs_pool {
 	int threshold;
 };
 
-int mlx5_fs_bulk_init(struct mlx5_core_dev *dev, struct mlx5_fs_bulk *fs_bulk,
-		      int bulk_len);
+void mlx5_fs_bulk_init(struct mlx5_fs_bulk *fs_bulk, int bulk_len);
+int mlx5_fs_bulk_bitmap_alloc(struct mlx5_core_dev *dev,
+			      struct mlx5_fs_bulk *fs_bulk);
 void mlx5_fs_bulk_cleanup(struct mlx5_fs_bulk *fs_bulk);
 int mlx5_fs_bulk_get_free_amount(struct mlx5_fs_bulk *bulk);
 
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/steering/hws/fs_hws_pools.c b/drivers/net/ethernet/mellanox/mlx5/core/steering/hws/fs_hws_pools.c
index 839d71bd4216..5bc8e97ecf1c 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/steering/hws/fs_hws_pools.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/steering/hws/fs_hws_pools.c
@@ -121,7 +121,9 @@ mlx5_fs_hws_pr_bulk_create(struct mlx5_core_dev *dev, void *pool_ctx)
 	if (!pr_bulk)
 		return NULL;
 
-	if (mlx5_fs_bulk_init(dev, &pr_bulk->fs_bulk, bulk_len))
+	mlx5_fs_bulk_init(&pr_bulk->fs_bulk, bulk_len);
+
+	if (mlx5_fs_bulk_bitmap_alloc(dev, &pr_bulk->fs_bulk))
 		goto free_pr_bulk;
 
 	for (i = 0; i < bulk_len; i++) {
@@ -275,7 +277,9 @@ mlx5_fs_hws_mh_bulk_create(struct mlx5_core_dev *dev, void *pool_ctx)
 	if (!mh_bulk)
 		return NULL;
 
-	if (mlx5_fs_bulk_init(dev, &mh_bulk->fs_bulk, bulk_len))
+	mlx5_fs_bulk_init(&mh_bulk->fs_bulk, bulk_len);
+
+	if (mlx5_fs_bulk_bitmap_alloc(dev, &mh_bulk->fs_bulk))
 		goto free_mh_bulk;
 
 	for (int i = 0; i < bulk_len; i++) {
-- 
2.31.1

[PATCH net-next 3/3] net/mlx5: Initialize bulk for single flow counters

[Tariq Toukan]

From: Moshe Shemesh <moshe@nvidia.com>

Ensure that flow counters allocated with mlx5_fc_single_alloc() have
bulk correctly initialized so they can safely be used in HWS rules.

Signed-off-by: Moshe Shemesh <moshe@nvidia.com>
Reviewed-by: Mark Bloch <mbloch@nvidia.com>
Reviewed-by: Yevgeny Kliteynik <kliteyn@nvidia.com>
Signed-off-by: Tariq Toukan <tariqt@nvidia.com>
---
 .../net/ethernet/mellanox/mlx5/core/fs_core.h |  3 +-
 .../ethernet/mellanox/mlx5/core/fs_counters.c | 39 +++++++++++++------
 2 files changed, 29 insertions(+), 13 deletions(-)

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/fs_core.h b/drivers/net/ethernet/mellanox/mlx5/core/fs_core.h
index 1c6591425260..dbaf33b537f7 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/fs_core.h
+++ b/drivers/net/ethernet/mellanox/mlx5/core/fs_core.h
@@ -308,7 +308,8 @@ struct mlx5_flow_root_namespace {
 };
 
 enum mlx5_fc_type {
-	MLX5_FC_TYPE_ACQUIRED = 0,
+	MLX5_FC_TYPE_POOL_ACQUIRED = 0,
+	MLX5_FC_TYPE_SINGLE,
 	MLX5_FC_TYPE_LOCAL,
 };
 
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/fs_counters.c b/drivers/net/ethernet/mellanox/mlx5/core/fs_counters.c
index 14539a20a60f..fe7caa910219 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/fs_counters.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/fs_counters.c
@@ -153,6 +153,7 @@ static void mlx5_fc_stats_query_all_counters(struct mlx5_core_dev *dev)
 static void mlx5_fc_free(struct mlx5_core_dev *dev, struct mlx5_fc *counter)
 {
 	mlx5_cmd_fc_free(dev, counter->id);
+	kfree(counter->bulk);
 	kfree(counter);
 }
 
@@ -163,7 +164,7 @@ static void mlx5_fc_release(struct mlx5_core_dev *dev, struct mlx5_fc *counter)
 	if (WARN_ON(counter->type == MLX5_FC_TYPE_LOCAL))
 		return;
 
-	if (counter->bulk)
+	if (counter->type == MLX5_FC_TYPE_POOL_ACQUIRED)
 		mlx5_fc_pool_release_counter(&fc_stats->fc_pool, counter);
 	else
 		mlx5_fc_free(dev, counter);
@@ -220,8 +221,16 @@ static void mlx5_fc_stats_work(struct work_struct *work)
 	mlx5_fc_stats_query_all_counters(dev);
 }
 
+static void mlx5_fc_bulk_init(struct mlx5_fc_bulk *fc_bulk, u32 base_id)
+{
+	fc_bulk->base_id = base_id;
+	refcount_set(&fc_bulk->hws_data.hws_action_refcount, 0);
+	mutex_init(&fc_bulk->hws_data.lock);
+}
+
 static struct mlx5_fc *mlx5_fc_single_alloc(struct mlx5_core_dev *dev)
 {
+	struct mlx5_fc_bulk *fc_bulk;
 	struct mlx5_fc *counter;
 	int err;
 
@@ -229,13 +238,26 @@ static struct mlx5_fc *mlx5_fc_single_alloc(struct mlx5_core_dev *dev)
 	if (!counter)
 		return ERR_PTR(-ENOMEM);
 
-	err = mlx5_cmd_fc_alloc(dev, &counter->id);
-	if (err) {
-		kfree(counter);
-		return ERR_PTR(err);
+	fc_bulk = kzalloc(sizeof(*fc_bulk), GFP_KERNEL);
+	if (!fc_bulk) {
+		err = -ENOMEM;
+		goto free_counter;
 	}
+	err = mlx5_cmd_fc_alloc(dev, &counter->id);
+	if (err)
+		goto free_bulk;
 
+	counter->type = MLX5_FC_TYPE_SINGLE;
+	mlx5_fs_bulk_init(&fc_bulk->fs_bulk, 1);
+	mlx5_fc_bulk_init(fc_bulk, counter->id);
+	counter->bulk = fc_bulk;
 	return counter;
+
+free_bulk:
+	kfree(fc_bulk);
+free_counter:
+	kfree(counter);
+	return ERR_PTR(err);
 }
 
 static struct mlx5_fc *mlx5_fc_acquire(struct mlx5_core_dev *dev, bool aging)
@@ -421,13 +443,6 @@ static void mlx5_fc_init(struct mlx5_fc *counter, struct mlx5_fc_bulk *bulk,
 	counter->id = id;
 }
 
-static void mlx5_fc_bulk_init(struct mlx5_fc_bulk *fc_bulk, u32 base_id)
-{
-	fc_bulk->base_id = base_id;
-	refcount_set(&fc_bulk->hws_data.hws_action_refcount, 0);
-	mutex_init(&fc_bulk->hws_data.lock);
-}
-
 u32 mlx5_fc_get_base_id(struct mlx5_fc *counter)
 {
 	return counter->bulk->base_id;
-- 
2.31.1

Re: [PATCH net-next 3/3] net/mlx5: Initialize bulk for single flow counters

[Paolo Abeni]

On 1/12/26 10:40 AM, Tariq Toukan wrote:
> @@ -220,8 +221,16 @@ static void mlx5_fc_stats_work(struct work_struct *work)
>  	mlx5_fc_stats_query_all_counters(dev);
>  }
>  
> +static void mlx5_fc_bulk_init(struct mlx5_fc_bulk *fc_bulk, u32 base_id)
> +{
> +	fc_bulk->base_id = base_id;
> +	refcount_set(&fc_bulk->hws_data.hws_action_refcount, 0);
> +	mutex_init(&fc_bulk->hws_data.lock);
> +}

Not worthy a repost, but you could have avoided moving this function
placing it here in patch 1/3.

/P

Re: [PATCH net-next 0/3] net/mlx5: HWS single flow counter support

[Simon Horman]

On Mon, Jan 12, 2026 at 11:40:22AM +0200, Tariq Toukan wrote:
> Hi,
> 
> This small series refactors the flow counter bulk initialization code
> and extends it so that single flow counters are also usable by hardware
> steering (HWS) rules.
> 
> Patches 1-2 refactor the bulk init path: first by factoring out common
> flow counter bulk initialization into mlx5_fc_bulk_init(), then by
> splitting the bitmap allocation into mlx5_fs_bulk_bitmap_alloc(), with
> no functional changes.
> 
> Patch 3 initializes bulk data for counters allocated via
> mlx5_fc_single_alloc(), so they can be safely used by HWS rules.

Hi Tariq,

Overall this looks good to me.
Am I correct in thinking that there will
be follow-up patches to make HWS use counters?

Re: [PATCH net-next 0/3] net/mlx5: HWS single flow counter support

[patchwork-bot+netdevbpf]

Hello:

This series was applied to netdev/net-next.git (main)
by Paolo Abeni <pabeni@redhat.com>:

On Mon, 12 Jan 2026 11:40:22 +0200 you wrote:
> Hi,
> 
> This small series refactors the flow counter bulk initialization code
> and extends it so that single flow counters are also usable by hardware
> steering (HWS) rules.
> 
> Patches 1-2 refactor the bulk init path: first by factoring out common
> flow counter bulk initialization into mlx5_fc_bulk_init(), then by
> splitting the bitmap allocation into mlx5_fs_bulk_bitmap_alloc(), with
> no functional changes.
> 
> [...]

Here is the summary with links:
  - [net-next,1/3] net/mlx5: fs, factor out flow counter bulk init
    https://git.kernel.org/netdev/net-next/c/96e89982a68c
  - [net-next,2/3] net/mlx5: fs, split bulk init
    https://git.kernel.org/netdev/net-next/c/6a6c4dd7c019
  - [net-next,3/3] net/mlx5: Initialize bulk for single flow counters
    https://git.kernel.org/netdev/net-next/c/1c8910f50350

You are awesome, thank you!
-- 
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