[PATCH net-next V2 0/4] net/mlx5: Refactor devcom and add net namespace support

[PATCH net-next V2 0/4] net/mlx5: Refactor devcom and add net namespace support

[Tariq Toukan]

Hi,

This series by Shay improves the mlx5 devcom infrastructure by
introducing a structured matching attribute interface, relocating
certain devcom registration flows to more appropriate locations, and
adding net namespace awareness to the devcom framework and its users.

Patch 1: Refactors the devcom interface to accept a match attribute
structure instead of raw keys, enabling future extensibility such as
namespace-based matching.

Patch 2: Moves the devcom registration for HCA components from the core
code to the LAG layer to better reflect their logical ownership and
lifecycle.

Patch 3: Adds net namespace support to the devcom framework, enabling
components to operate in isolated namespaces.

Patch 4: Updates the LAG layer to make use of the new namespace-aware
devcom interface and improves reload behavior in LAG mode.

Regards,
Tariq


V1:
https://lore.kernel.org/all/1757572267-601785-1-git-send-email-tariqt@nvidia.com/

Changes:
V1->V2:
- Added Simon's reviewed by tag to patches 1,2 and 3.
- Extended the commit message of patch 4 to address
  Simon's comments on it.

Shay Drory (4):
  net/mlx5: Refactor devcom to use match attributes
  net/mlx5: Lag, move devcom registration to LAG layer
  net/mlx5: Add net namespace support to devcom
  net/mlx5: Lag, add net namespace support

 .../net/ethernet/mellanox/mlx5/core/devlink.c |  5 ---
 .../net/ethernet/mellanox/mlx5/core/en_main.c |  6 ++-
 .../net/ethernet/mellanox/mlx5/core/en_tc.c   | 10 +++--
 .../net/ethernet/mellanox/mlx5/core/eswitch.h |  7 ++-
 .../mellanox/mlx5/core/eswitch_offloads.c     |  5 ++-
 .../net/ethernet/mellanox/mlx5/core/lag/lag.c | 45 +++++++++++++++++--
 .../net/ethernet/mellanox/mlx5/core/lag/lag.h |  1 +
 .../ethernet/mellanox/mlx5/core/lib/clock.c   | 14 ++++--
 .../ethernet/mellanox/mlx5/core/lib/devcom.c  | 44 +++++++++++++-----
 .../ethernet/mellanox/mlx5/core/lib/devcom.h  | 16 ++++++-
 .../net/ethernet/mellanox/mlx5/core/lib/sd.c  |  6 ++-
 .../net/ethernet/mellanox/mlx5/core/main.c    | 24 ----------
 12 files changed, 126 insertions(+), 57 deletions(-)


base-commit: 5b5ba63a54cc7cb050fa734dbf495ffd63f9cbf7
-- 
2.31.1

[PATCH net-next V2 1/4] net/mlx5: Refactor devcom to use match attributes

[Tariq Toukan]

From: Shay Drory <shayd@nvidia.com>

Refactor the devcom interface to use a match attribute structure instead
of passing raw keys. This change lays the groundwork for extending
devcom matching logic with additional fields like net namespace,
improving its flexibility and robustness.

No functional changes.

Signed-off-by: Shay Drory <shayd@nvidia.com>
Reviewed-by: Mark Bloch <mbloch@nvidia.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Signed-off-by: Tariq Toukan <tariqt@nvidia.com>
---
 .../net/ethernet/mellanox/mlx5/core/en_main.c |  6 +++-
 .../net/ethernet/mellanox/mlx5/core/en_tc.c   |  7 +++--
 .../net/ethernet/mellanox/mlx5/core/eswitch.h |  7 +++--
 .../mellanox/mlx5/core/eswitch_offloads.c     |  5 +--
 .../ethernet/mellanox/mlx5/core/lib/clock.c   | 14 ++++++---
 .../ethernet/mellanox/mlx5/core/lib/devcom.c  | 31 +++++++++++++------
 .../ethernet/mellanox/mlx5/core/lib/devcom.h  | 10 +++++-
 .../net/ethernet/mellanox/mlx5/core/lib/sd.c  |  4 ++-
 .../net/ethernet/mellanox/mlx5/core/main.c    |  7 +++--
 9 files changed, 65 insertions(+), 26 deletions(-)

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_main.c b/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
index 714cce595692..fe5f5ae433b7 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
@@ -235,9 +235,13 @@ static int mlx5e_devcom_event_mpv(int event, void *my_data, void *event_data)
 
 static int mlx5e_devcom_init_mpv(struct mlx5e_priv *priv, u64 *data)
 {
+	struct mlx5_devcom_match_attr attr = {
+		.key.val = *data,
+	};
+
 	priv->devcom = mlx5_devcom_register_component(priv->mdev->priv.devc,
 						      MLX5_DEVCOM_MPV,
-						      *data,
+						      &attr,
 						      mlx5e_devcom_event_mpv,
 						      priv);
 	if (IS_ERR(priv->devcom))
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_tc.c b/drivers/net/ethernet/mellanox/mlx5/core/en_tc.c
index 32c07a8b03d1..9874a15c6fba 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_tc.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_tc.c
@@ -5387,12 +5387,13 @@ void mlx5e_tc_ht_cleanup(struct rhashtable *tc_ht)
 int mlx5e_tc_esw_init(struct mlx5_rep_uplink_priv *uplink_priv)
 {
 	const size_t sz_enc_opts = sizeof(struct tunnel_match_enc_opts);
+	struct mlx5_devcom_match_attr attr = {};
 	struct netdev_phys_item_id ppid;
 	struct mlx5e_rep_priv *rpriv;
 	struct mapping_ctx *mapping;
 	struct mlx5_eswitch *esw;
 	struct mlx5e_priv *priv;
-	u64 mapping_id, key;
+	u64 mapping_id;
 	int err = 0;
 
 	rpriv = container_of(uplink_priv, struct mlx5e_rep_priv, uplink_priv);
@@ -5448,8 +5449,8 @@ int mlx5e_tc_esw_init(struct mlx5_rep_uplink_priv *uplink_priv)
 
 	err = netif_get_port_parent_id(priv->netdev, &ppid, false);
 	if (!err) {
-		memcpy(&key, &ppid.id, sizeof(key));
-		mlx5_esw_offloads_devcom_init(esw, key);
+		memcpy(&attr.key.val, &ppid.id, sizeof(attr.key.val));
+		mlx5_esw_offloads_devcom_init(esw, &attr);
 	}
 
 	return 0;
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/eswitch.h b/drivers/net/ethernet/mellanox/mlx5/core/eswitch.h
index 4fe285ce32aa..df3756d7e52e 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/eswitch.h
+++ b/drivers/net/ethernet/mellanox/mlx5/core/eswitch.h
@@ -433,7 +433,8 @@ int mlx5_eswitch_enable(struct mlx5_eswitch *esw, int num_vfs);
 void mlx5_eswitch_disable_sriov(struct mlx5_eswitch *esw, bool clear_vf);
 void mlx5_eswitch_disable_locked(struct mlx5_eswitch *esw);
 void mlx5_eswitch_disable(struct mlx5_eswitch *esw);
-void mlx5_esw_offloads_devcom_init(struct mlx5_eswitch *esw, u64 key);
+void mlx5_esw_offloads_devcom_init(struct mlx5_eswitch *esw,
+				   const struct mlx5_devcom_match_attr *attr);
 void mlx5_esw_offloads_devcom_cleanup(struct mlx5_eswitch *esw);
 bool mlx5_esw_offloads_devcom_is_ready(struct mlx5_eswitch *esw);
 int mlx5_eswitch_set_vport_mac(struct mlx5_eswitch *esw,
@@ -928,7 +929,9 @@ static inline void mlx5_eswitch_cleanup(struct mlx5_eswitch *esw) {}
 static inline int mlx5_eswitch_enable(struct mlx5_eswitch *esw, int num_vfs) { return 0; }
 static inline void mlx5_eswitch_disable_sriov(struct mlx5_eswitch *esw, bool clear_vf) {}
 static inline void mlx5_eswitch_disable(struct mlx5_eswitch *esw) {}
-static inline void mlx5_esw_offloads_devcom_init(struct mlx5_eswitch *esw, u64 key) {}
+static inline void
+mlx5_esw_offloads_devcom_init(struct mlx5_eswitch *esw,
+			      const struct mlx5_devcom_match_attr *attr) {}
 static inline void mlx5_esw_offloads_devcom_cleanup(struct mlx5_eswitch *esw) {}
 static inline bool mlx5_esw_offloads_devcom_is_ready(struct mlx5_eswitch *esw) { return false; }
 static inline bool mlx5_eswitch_is_funcs_handler(struct mlx5_core_dev *dev) { return false; }
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/eswitch_offloads.c b/drivers/net/ethernet/mellanox/mlx5/core/eswitch_offloads.c
index d57f86d297ab..bc9838dc5bf8 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/eswitch_offloads.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/eswitch_offloads.c
@@ -3104,7 +3104,8 @@ static int mlx5_esw_offloads_devcom_event(int event,
 	return err;
 }
 
-void mlx5_esw_offloads_devcom_init(struct mlx5_eswitch *esw, u64 key)
+void mlx5_esw_offloads_devcom_init(struct mlx5_eswitch *esw,
+				   const struct mlx5_devcom_match_attr *attr)
 {
 	int i;
 
@@ -3123,7 +3124,7 @@ void mlx5_esw_offloads_devcom_init(struct mlx5_eswitch *esw, u64 key)
 	esw->num_peers = 0;
 	esw->devcom = mlx5_devcom_register_component(esw->dev->priv.devc,
 						     MLX5_DEVCOM_ESW_OFFLOADS,
-						     key,
+						     attr,
 						     mlx5_esw_offloads_devcom_event,
 						     esw);
 	if (IS_ERR(esw->devcom))
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/lib/clock.c b/drivers/net/ethernet/mellanox/mlx5/core/lib/clock.c
index 7ad3baca99de..8f2ad45bec9f 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/lib/clock.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/lib/clock.c
@@ -1435,14 +1435,20 @@ static int mlx5_clock_alloc(struct mlx5_core_dev *mdev, bool shared)
 static void mlx5_shared_clock_register(struct mlx5_core_dev *mdev, u64 key)
 {
 	struct mlx5_core_dev *peer_dev, *next = NULL;
+	struct mlx5_devcom_match_attr attr = {
+		.key.val = key,
+	};
+	struct mlx5_devcom_comp_dev *compd;
 	struct mlx5_devcom_comp_dev *pos;
 
-	mdev->clock_state->compdev = mlx5_devcom_register_component(mdev->priv.devc,
-								    MLX5_DEVCOM_SHARED_CLOCK,
-								    key, NULL, mdev);
-	if (IS_ERR(mdev->clock_state->compdev))
+	compd = mlx5_devcom_register_component(mdev->priv.devc,
+					       MLX5_DEVCOM_SHARED_CLOCK,
+					       &attr, NULL, mdev);
+	if (IS_ERR(compd))
 		return;
 
+	mdev->clock_state->compdev = compd;
+
 	mlx5_devcom_comp_lock(mdev->clock_state->compdev);
 	mlx5_devcom_for_each_peer_entry(mdev->clock_state->compdev, peer_dev, pos) {
 		if (peer_dev->clock) {
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/lib/devcom.c b/drivers/net/ethernet/mellanox/mlx5/core/lib/devcom.c
index 7b0766c89f4c..1ab9de316deb 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/lib/devcom.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/lib/devcom.c
@@ -22,11 +22,15 @@ struct mlx5_devcom_dev {
 	struct kref ref;
 };
 
+struct mlx5_devcom_key {
+	union mlx5_devcom_match_key key;
+};
+
 struct mlx5_devcom_comp {
 	struct list_head comp_list;
 	enum mlx5_devcom_component id;
-	u64 key;
 	struct list_head comp_dev_list_head;
+	struct mlx5_devcom_key key;
 	mlx5_devcom_event_handler_t handler;
 	struct kref ref;
 	bool ready;
@@ -108,7 +112,8 @@ void mlx5_devcom_unregister_device(struct mlx5_devcom_dev *devc)
 }
 
 static struct mlx5_devcom_comp *
-mlx5_devcom_comp_alloc(u64 id, u64 key, mlx5_devcom_event_handler_t handler)
+mlx5_devcom_comp_alloc(u64 id, const struct mlx5_devcom_match_attr *attr,
+		       mlx5_devcom_event_handler_t handler)
 {
 	struct mlx5_devcom_comp *comp;
 
@@ -117,7 +122,7 @@ mlx5_devcom_comp_alloc(u64 id, u64 key, mlx5_devcom_event_handler_t handler)
 		return ERR_PTR(-ENOMEM);
 
 	comp->id = id;
-	comp->key = key;
+	comp->key.key = attr->key;
 	comp->handler = handler;
 	init_rwsem(&comp->sem);
 	lockdep_register_key(&comp->lock_key);
@@ -180,21 +185,27 @@ devcom_free_comp_dev(struct mlx5_devcom_comp_dev *devcom)
 static bool
 devcom_component_equal(struct mlx5_devcom_comp *devcom,
 		       enum mlx5_devcom_component id,
-		       u64 key)
+		       const struct mlx5_devcom_match_attr *attr)
 {
-	return devcom->id == id && devcom->key == key;
+	if (devcom->id != id)
+		return false;
+
+	if (memcmp(&devcom->key.key, &attr->key, sizeof(devcom->key.key)))
+		return false;
+
+	return true;
 }
 
 static struct mlx5_devcom_comp *
 devcom_component_get(struct mlx5_devcom_dev *devc,
 		     enum mlx5_devcom_component id,
-		     u64 key,
+		     const struct mlx5_devcom_match_attr *attr,
 		     mlx5_devcom_event_handler_t handler)
 {
 	struct mlx5_devcom_comp *comp;
 
 	devcom_for_each_component(comp) {
-		if (devcom_component_equal(comp, id, key)) {
+		if (devcom_component_equal(comp, id, attr)) {
 			if (handler == comp->handler) {
 				kref_get(&comp->ref);
 				return comp;
@@ -212,7 +223,7 @@ devcom_component_get(struct mlx5_devcom_dev *devc,
 struct mlx5_devcom_comp_dev *
 mlx5_devcom_register_component(struct mlx5_devcom_dev *devc,
 			       enum mlx5_devcom_component id,
-			       u64 key,
+			       const struct mlx5_devcom_match_attr *attr,
 			       mlx5_devcom_event_handler_t handler,
 			       void *data)
 {
@@ -223,14 +234,14 @@ mlx5_devcom_register_component(struct mlx5_devcom_dev *devc,
 		return ERR_PTR(-EINVAL);
 
 	mutex_lock(&comp_list_lock);
-	comp = devcom_component_get(devc, id, key, handler);
+	comp = devcom_component_get(devc, id, attr, handler);
 	if (IS_ERR(comp)) {
 		devcom = ERR_PTR(-EINVAL);
 		goto out_unlock;
 	}
 
 	if (!comp) {
-		comp = mlx5_devcom_comp_alloc(id, key, handler);
+		comp = mlx5_devcom_comp_alloc(id, attr, handler);
 		if (IS_ERR(comp)) {
 			devcom = ERR_CAST(comp);
 			goto out_unlock;
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/lib/devcom.h b/drivers/net/ethernet/mellanox/mlx5/core/lib/devcom.h
index c79699b94a02..f350d2395707 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/lib/devcom.h
+++ b/drivers/net/ethernet/mellanox/mlx5/core/lib/devcom.h
@@ -6,6 +6,14 @@
 
 #include <linux/mlx5/driver.h>
 
+union mlx5_devcom_match_key {
+	u64 val;
+};
+
+struct mlx5_devcom_match_attr {
+	union mlx5_devcom_match_key key;
+};
+
 enum mlx5_devcom_component {
 	MLX5_DEVCOM_ESW_OFFLOADS,
 	MLX5_DEVCOM_MPV,
@@ -25,7 +33,7 @@ void mlx5_devcom_unregister_device(struct mlx5_devcom_dev *devc);
 struct mlx5_devcom_comp_dev *
 mlx5_devcom_register_component(struct mlx5_devcom_dev *devc,
 			       enum mlx5_devcom_component id,
-			       u64 key,
+			       const struct mlx5_devcom_match_attr *attr,
 			       mlx5_devcom_event_handler_t handler,
 			       void *data);
 void mlx5_devcom_unregister_component(struct mlx5_devcom_comp_dev *devcom);
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/lib/sd.c b/drivers/net/ethernet/mellanox/mlx5/core/lib/sd.c
index eeb0b7ea05f1..d4015328ba65 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/lib/sd.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/lib/sd.c
@@ -210,13 +210,15 @@ static void sd_cleanup(struct mlx5_core_dev *dev)
 static int sd_register(struct mlx5_core_dev *dev)
 {
 	struct mlx5_devcom_comp_dev *devcom, *pos;
+	struct mlx5_devcom_match_attr attr = {};
 	struct mlx5_core_dev *peer, *primary;
 	struct mlx5_sd *sd, *primary_sd;
 	int err, i;
 
 	sd = mlx5_get_sd(dev);
+	attr.key.val = sd->group_id;
 	devcom = mlx5_devcom_register_component(dev->priv.devc, MLX5_DEVCOM_SD_GROUP,
-						sd->group_id, NULL, dev);
+						&attr, NULL, dev);
 	if (IS_ERR(devcom))
 		return PTR_ERR(devcom);
 
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/main.c b/drivers/net/ethernet/mellanox/mlx5/core/main.c
index 0951c7cc1b5f..1f7942202e14 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/main.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/main.c
@@ -975,6 +975,10 @@ static void mlx5_pci_close(struct mlx5_core_dev *dev)
 
 static void mlx5_register_hca_devcom_comp(struct mlx5_core_dev *dev)
 {
+	struct mlx5_devcom_match_attr attr = {
+		.key.val = mlx5_query_nic_system_image_guid(dev),
+	};
+
 	/* This component is use to sync adding core_dev to lag_dev and to sync
 	 * changes of mlx5_adev_devices between LAG layer and other layers.
 	 */
@@ -983,8 +987,7 @@ static void mlx5_register_hca_devcom_comp(struct mlx5_core_dev *dev)
 
 	dev->priv.hca_devcom_comp =
 		mlx5_devcom_register_component(dev->priv.devc, MLX5_DEVCOM_HCA_PORTS,
-					       mlx5_query_nic_system_image_guid(dev),
-					       NULL, dev);
+					       &attr, NULL, dev);
 	if (IS_ERR(dev->priv.hca_devcom_comp))
 		mlx5_core_err(dev, "Failed to register devcom HCA component\n");
 }
-- 
2.31.1

[PATCH net-next V2 2/4] net/mlx5: Lag, move devcom registration to LAG layer

[Tariq Toukan]

From: Shay Drory <shayd@nvidia.com>

Move the devcom registration for the HCA_PORTS component from the core
initialization path into the LAG logic. This better reflects the logical
ownership of this component and ensures proper alignment with the LAG
lifecycle.

Signed-off-by: Shay Drory <shayd@nvidia.com>
Reviewed-by: Mark Bloch <mbloch@nvidia.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Signed-off-by: Tariq Toukan <tariqt@nvidia.com>
---
 .../net/ethernet/mellanox/mlx5/core/lag/lag.c | 31 ++++++++++++++++++-
 .../net/ethernet/mellanox/mlx5/core/main.c    | 27 ----------------
 2 files changed, 30 insertions(+), 28 deletions(-)

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/lag/lag.c b/drivers/net/ethernet/mellanox/mlx5/core/lag/lag.c
index d058cbb4a00c..ccb22ed13f84 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/lag/lag.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/lag/lag.c
@@ -1404,6 +1404,34 @@ static int __mlx5_lag_dev_add_mdev(struct mlx5_core_dev *dev)
 	return 0;
 }
 
+static void mlx5_lag_unregister_hca_devcom_comp(struct mlx5_core_dev *dev)
+{
+	mlx5_devcom_unregister_component(dev->priv.hca_devcom_comp);
+}
+
+static int mlx5_lag_register_hca_devcom_comp(struct mlx5_core_dev *dev)
+{
+	struct mlx5_devcom_match_attr attr = {
+		.key.val = mlx5_query_nic_system_image_guid(dev),
+	};
+
+	/* This component is use to sync adding core_dev to lag_dev and to sync
+	 * changes of mlx5_adev_devices between LAG layer and other layers.
+	 */
+	dev->priv.hca_devcom_comp =
+		mlx5_devcom_register_component(dev->priv.devc,
+					       MLX5_DEVCOM_HCA_PORTS,
+					       &attr, NULL, dev);
+	if (IS_ERR(dev->priv.hca_devcom_comp)) {
+		mlx5_core_err(dev,
+			      "Failed to register devcom HCA component, err: %ld\n",
+			      PTR_ERR(dev->priv.hca_devcom_comp));
+		return PTR_ERR(dev->priv.hca_devcom_comp);
+	}
+
+	return 0;
+}
+
 void mlx5_lag_remove_mdev(struct mlx5_core_dev *dev)
 {
 	struct mlx5_lag *ldev;
@@ -1425,6 +1453,7 @@ void mlx5_lag_remove_mdev(struct mlx5_core_dev *dev)
 	}
 	mlx5_ldev_remove_mdev(ldev, dev);
 	mutex_unlock(&ldev->lock);
+	mlx5_lag_unregister_hca_devcom_comp(dev);
 	mlx5_ldev_put(ldev);
 }
 
@@ -1435,7 +1464,7 @@ void mlx5_lag_add_mdev(struct mlx5_core_dev *dev)
 	if (!mlx5_lag_is_supported(dev))
 		return;
 
-	if (IS_ERR_OR_NULL(dev->priv.hca_devcom_comp))
+	if (mlx5_lag_register_hca_devcom_comp(dev))
 		return;
 
 recheck:
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/main.c b/drivers/net/ethernet/mellanox/mlx5/core/main.c
index 1f7942202e14..eb3ac98a2621 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/main.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/main.c
@@ -973,30 +973,6 @@ static void mlx5_pci_close(struct mlx5_core_dev *dev)
 	mlx5_pci_disable_device(dev);
 }
 
-static void mlx5_register_hca_devcom_comp(struct mlx5_core_dev *dev)
-{
-	struct mlx5_devcom_match_attr attr = {
-		.key.val = mlx5_query_nic_system_image_guid(dev),
-	};
-
-	/* This component is use to sync adding core_dev to lag_dev and to sync
-	 * changes of mlx5_adev_devices between LAG layer and other layers.
-	 */
-	if (!mlx5_lag_is_supported(dev))
-		return;
-
-	dev->priv.hca_devcom_comp =
-		mlx5_devcom_register_component(dev->priv.devc, MLX5_DEVCOM_HCA_PORTS,
-					       &attr, NULL, dev);
-	if (IS_ERR(dev->priv.hca_devcom_comp))
-		mlx5_core_err(dev, "Failed to register devcom HCA component\n");
-}
-
-static void mlx5_unregister_hca_devcom_comp(struct mlx5_core_dev *dev)
-{
-	mlx5_devcom_unregister_component(dev->priv.hca_devcom_comp);
-}
-
 static int mlx5_init_once(struct mlx5_core_dev *dev)
 {
 	int err;
@@ -1005,7 +981,6 @@ static int mlx5_init_once(struct mlx5_core_dev *dev)
 	if (IS_ERR(dev->priv.devc))
 		mlx5_core_warn(dev, "failed to register devcom device %ld\n",
 			       PTR_ERR(dev->priv.devc));
-	mlx5_register_hca_devcom_comp(dev);
 
 	err = mlx5_query_board_id(dev);
 	if (err) {
@@ -1143,7 +1118,6 @@ static int mlx5_init_once(struct mlx5_core_dev *dev)
 err_irq_cleanup:
 	mlx5_irq_table_cleanup(dev);
 err_devcom:
-	mlx5_unregister_hca_devcom_comp(dev);
 	mlx5_devcom_unregister_device(dev->priv.devc);
 
 	return err;
@@ -1174,7 +1148,6 @@ static void mlx5_cleanup_once(struct mlx5_core_dev *dev)
 	mlx5_events_cleanup(dev);
 	mlx5_eq_table_cleanup(dev);
 	mlx5_irq_table_cleanup(dev);
-	mlx5_unregister_hca_devcom_comp(dev);
 	mlx5_devcom_unregister_device(dev->priv.devc);
 }
 
-- 
2.31.1

[PATCH net-next V2 3/4] net/mlx5: Add net namespace support to devcom

[Tariq Toukan]

From: Shay Drory <shayd@nvidia.com>

Extend the devcom framework to support namespace-aware components.

The existing devcom matching logic was based solely on numeric keys,
limiting its use to the global (init_net) scope or requiring clients to
ignore namespaces altogether, both of which are incorrect in
multi-namespace environments.

This patch introduces namespace support by allowing devcom clients to
provide a namespace match attribute. The devcom pairing mechanism is
updated to compare the namespace, enabling proper isolation and
interaction of components across different net namespaces.

With this change, components that require namespace aware pairing, such
as SD groups or LAG, can now work correctly in multi-namespace
scenarios. In particular, this opens the way to support hardware LAG
within a net namespace.

Signed-off-by: Shay Drory <shayd@nvidia.com>
Reviewed-by: Mark Bloch <mbloch@nvidia.com>
Reviewed-by: Parav Pandit <parav@nvidia.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Signed-off-by: Tariq Toukan <tariqt@nvidia.com>
---
 drivers/net/ethernet/mellanox/mlx5/core/en_tc.c     |  3 +++
 .../net/ethernet/mellanox/mlx5/core/lib/devcom.c    | 13 +++++++++++++
 .../net/ethernet/mellanox/mlx5/core/lib/devcom.h    |  6 ++++++
 drivers/net/ethernet/mellanox/mlx5/core/lib/sd.c    |  2 ++
 4 files changed, 24 insertions(+)

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_tc.c b/drivers/net/ethernet/mellanox/mlx5/core/en_tc.c
index 9874a15c6fba..09c3eecb836d 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_tc.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_tc.c
@@ -66,6 +66,7 @@
 #include "lib/devcom.h"
 #include "lib/geneve.h"
 #include "lib/fs_chains.h"
+#include "lib/mlx5.h"
 #include "diag/en_tc_tracepoint.h"
 #include <asm/div64.h>
 #include "lag/lag.h"
@@ -5450,6 +5451,8 @@ int mlx5e_tc_esw_init(struct mlx5_rep_uplink_priv *uplink_priv)
 	err = netif_get_port_parent_id(priv->netdev, &ppid, false);
 	if (!err) {
 		memcpy(&attr.key.val, &ppid.id, sizeof(attr.key.val));
+		attr.flags = MLX5_DEVCOM_MATCH_FLAGS_NS;
+		attr.net = mlx5_core_net(esw->dev);
 		mlx5_esw_offloads_devcom_init(esw, &attr);
 	}
 
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/lib/devcom.c b/drivers/net/ethernet/mellanox/mlx5/core/lib/devcom.c
index 1ab9de316deb..faa2833602c8 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/lib/devcom.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/lib/devcom.c
@@ -4,6 +4,7 @@
 #include <linux/mlx5/vport.h>
 #include <linux/list.h>
 #include "lib/devcom.h"
+#include "lib/mlx5.h"
 #include "mlx5_core.h"
 
 static LIST_HEAD(devcom_dev_list);
@@ -23,7 +24,9 @@ struct mlx5_devcom_dev {
 };
 
 struct mlx5_devcom_key {
+	u32 flags;
 	union mlx5_devcom_match_key key;
+	possible_net_t net;
 };
 
 struct mlx5_devcom_comp {
@@ -123,6 +126,9 @@ mlx5_devcom_comp_alloc(u64 id, const struct mlx5_devcom_match_attr *attr,
 
 	comp->id = id;
 	comp->key.key = attr->key;
+	comp->key.flags = attr->flags;
+	if (attr->flags & MLX5_DEVCOM_MATCH_FLAGS_NS)
+		write_pnet(&comp->key.net, attr->net);
 	comp->handler = handler;
 	init_rwsem(&comp->sem);
 	lockdep_register_key(&comp->lock_key);
@@ -190,9 +196,16 @@ devcom_component_equal(struct mlx5_devcom_comp *devcom,
 	if (devcom->id != id)
 		return false;
 
+	if (devcom->key.flags != attr->flags)
+		return false;
+
 	if (memcmp(&devcom->key.key, &attr->key, sizeof(devcom->key.key)))
 		return false;
 
+	if (devcom->key.flags & MLX5_DEVCOM_MATCH_FLAGS_NS &&
+	    !net_eq(read_pnet(&devcom->key.net), attr->net))
+		return false;
+
 	return true;
 }
 
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/lib/devcom.h b/drivers/net/ethernet/mellanox/mlx5/core/lib/devcom.h
index f350d2395707..609c85f47917 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/lib/devcom.h
+++ b/drivers/net/ethernet/mellanox/mlx5/core/lib/devcom.h
@@ -6,12 +6,18 @@
 
 #include <linux/mlx5/driver.h>
 
+enum mlx5_devom_match_flags {
+	MLX5_DEVCOM_MATCH_FLAGS_NS = BIT(0),
+};
+
 union mlx5_devcom_match_key {
 	u64 val;
 };
 
 struct mlx5_devcom_match_attr {
+	u32 flags;
 	union mlx5_devcom_match_key key;
+	struct net *net;
 };
 
 enum mlx5_devcom_component {
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/lib/sd.c b/drivers/net/ethernet/mellanox/mlx5/core/lib/sd.c
index d4015328ba65..f5c2701f6e87 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/lib/sd.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/lib/sd.c
@@ -217,6 +217,8 @@ static int sd_register(struct mlx5_core_dev *dev)
 
 	sd = mlx5_get_sd(dev);
 	attr.key.val = sd->group_id;
+	attr.flags = MLX5_DEVCOM_MATCH_FLAGS_NS;
+	attr.net = mlx5_core_net(dev);
 	devcom = mlx5_devcom_register_component(dev->priv.devc, MLX5_DEVCOM_SD_GROUP,
 						&attr, NULL, dev);
 	if (IS_ERR(devcom))
-- 
2.31.1

[PATCH net-next V2 4/4] net/mlx5: Lag, add net namespace support

[Tariq Toukan]

From: Shay Drory <shayd@nvidia.com>

Update the LAG implementation to support net namespace isolation.
Recent devcom changes added namespace-aware client matching. Align LAG
with this model so that hardware LAG forms only between mlx5 interfaces
that share the same network namespace. This avoids cross-namespace
interference and matches user expectations when devices are placed in
different netns.

Make LAG netns-aware by storing the device’s namespace in mlx5_lag and
registering the devcom client with that namespace. As a result, only
peers in the same netns are eligible to form a LAG.
Adjust reload handling so LAG teardown/re-evaluation happens in the
correct namespace context. Remove the blanket restriction that prevented
devlink reload when LAG was active. Remove the reload restriction here
allowing devlink reload in LAG mode is part of delivering complete netns
aware LAG support:

With per-netns devcom registration, reload no longer risks
cross-namespace coupling. The devcom client is torn down and
re-registered in the device’s current netns, and LAG is re-evaluated
within that scope. The change is trivial and self-contained, and keeping
it in this patch avoids splitting a feature that is functionally one
unit.

Only devices in same netns can form hardware LAG.
devlink reload no longer fails just because LAG is active.
LAG is torn down/re-created as needed within the correct namespace.
No change for setups that don’t use namespaces.

Signed-off-by: Shay Drory <shayd@nvidia.com>
Reviewed-by: Mark Bloch <mbloch@nvidia.com>
Reviewed-by: Parav Pandit <parav@nvidia.com>
Signed-off-by: Tariq Toukan <tariqt@nvidia.com>
---
 drivers/net/ethernet/mellanox/mlx5/core/devlink.c |  5 -----
 drivers/net/ethernet/mellanox/mlx5/core/lag/lag.c | 14 +++++++++++---
 drivers/net/ethernet/mellanox/mlx5/core/lag/lag.h |  1 +
 3 files changed, 12 insertions(+), 8 deletions(-)

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/devlink.c b/drivers/net/ethernet/mellanox/mlx5/core/devlink.c
index a0b68321355a..bfa44414be82 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/devlink.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/devlink.c
@@ -204,11 +204,6 @@ static int mlx5_devlink_reload_down(struct devlink *devlink, bool netns_change,
 		return 0;
 	}
 
-	if (mlx5_lag_is_active(dev)) {
-		NL_SET_ERR_MSG_MOD(extack, "reload is unsupported in Lag mode");
-		return -EOPNOTSUPP;
-	}
-
 	if (mlx5_core_is_mp_slave(dev)) {
 		NL_SET_ERR_MSG_MOD(extack, "reload is unsupported for multi port slave");
 		return -EOPNOTSUPP;
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/lag/lag.c b/drivers/net/ethernet/mellanox/mlx5/core/lag/lag.c
index ccb22ed13f84..59c00c911275 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/lag/lag.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/lag/lag.c
@@ -35,6 +35,7 @@
 #include <linux/mlx5/driver.h>
 #include <linux/mlx5/eswitch.h>
 #include <linux/mlx5/vport.h>
+#include "lib/mlx5.h"
 #include "lib/devcom.h"
 #include "mlx5_core.h"
 #include "eswitch.h"
@@ -231,9 +232,13 @@ static void mlx5_do_bond_work(struct work_struct *work);
 static void mlx5_ldev_free(struct kref *ref)
 {
 	struct mlx5_lag *ldev = container_of(ref, struct mlx5_lag, ref);
+	struct net *net;
+
+	if (ldev->nb.notifier_call) {
+		net = read_pnet(&ldev->net);
+		unregister_netdevice_notifier_net(net, &ldev->nb);
+	}
 
-	if (ldev->nb.notifier_call)
-		unregister_netdevice_notifier_net(&init_net, &ldev->nb);
 	mlx5_lag_mp_cleanup(ldev);
 	cancel_delayed_work_sync(&ldev->bond_work);
 	destroy_workqueue(ldev->wq);
@@ -271,7 +276,8 @@ static struct mlx5_lag *mlx5_lag_dev_alloc(struct mlx5_core_dev *dev)
 	INIT_DELAYED_WORK(&ldev->bond_work, mlx5_do_bond_work);
 
 	ldev->nb.notifier_call = mlx5_lag_netdev_event;
-	if (register_netdevice_notifier_net(&init_net, &ldev->nb)) {
+	write_pnet(&ldev->net, mlx5_core_net(dev));
+	if (register_netdevice_notifier_net(read_pnet(&ldev->net), &ldev->nb)) {
 		ldev->nb.notifier_call = NULL;
 		mlx5_core_err(dev, "Failed to register LAG netdev notifier\n");
 	}
@@ -1413,6 +1419,8 @@ static int mlx5_lag_register_hca_devcom_comp(struct mlx5_core_dev *dev)
 {
 	struct mlx5_devcom_match_attr attr = {
 		.key.val = mlx5_query_nic_system_image_guid(dev),
+		.flags = MLX5_DEVCOM_MATCH_FLAGS_NS,
+		.net = mlx5_core_net(dev),
 	};
 
 	/* This component is use to sync adding core_dev to lag_dev and to sync
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/lag/lag.h b/drivers/net/ethernet/mellanox/mlx5/core/lag/lag.h
index c2f256bb2bc2..4918eee2b3da 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/lag/lag.h
+++ b/drivers/net/ethernet/mellanox/mlx5/core/lag/lag.h
@@ -67,6 +67,7 @@ struct mlx5_lag {
 	struct workqueue_struct   *wq;
 	struct delayed_work       bond_work;
 	struct notifier_block     nb;
+	possible_net_t net;
 	struct lag_mp             lag_mp;
 	struct mlx5_lag_port_sel  port_sel;
 	/* Protect lag fields/state changes */
-- 
2.31.1

Re: [PATCH net-next V2 0/4] net/mlx5: Refactor devcom and add net namespace support

[patchwork-bot+netdevbpf]

Hello:

This series was applied to netdev/net-next.git (main)
by Jakub Kicinski <kuba@kernel.org>:

On Mon, 15 Sep 2025 15:41:06 +0300 you wrote:
> Hi,
> 
> This series by Shay improves the mlx5 devcom infrastructure by
> introducing a structured matching attribute interface, relocating
> certain devcom registration flows to more appropriate locations, and
> adding net namespace awareness to the devcom framework and its users.
> 
> [...]

Here is the summary with links:
  - [net-next,V2,1/4] net/mlx5: Refactor devcom to use match attributes
    https://git.kernel.org/netdev/net-next/c/f05a82fbcc64
  - [net-next,V2,2/4] net/mlx5: Lag, move devcom registration to LAG layer
    https://git.kernel.org/netdev/net-next/c/5a977b5833b7
  - [net-next,V2,3/4] net/mlx5: Add net namespace support to devcom
    https://git.kernel.org/netdev/net-next/c/95f73447c269
  - [net-next,V2,4/4] net/mlx5: Lag, add net namespace support
    https://git.kernel.org/netdev/net-next/c/d654d3fc2066

You are awesome, thank you!
-- 
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