[PATCH net-next v5 0/3] net: mana: debugfs fixes and diagnostic info

[PATCH net-next v5 0/3] net: mana: debugfs fixes and diagnostic info

[Erni Sri Satya Vennela]

This series first fixes two pre-existing debugfs issues in the MANA
driver, then adds new debugfs entries for hardware diagnostic info.

Patch 1 fixes the per-device debugfs directory naming to use the unique
PCI BDF address via pci_name(), avoiding a potential NULL pointer
dereference when pdev->slot is NULL and preventing name collisions
across multiple PFs or VFs.

Patch 2 moves the current_speed debugfs file creation from
mana_probe_port() to mana_init_port() so it survives detach/attach
cycles triggered by MTU changes or XDP program changes.

Patch 3 adds new debugfs entries exposing hardware configuration and
diagnostic information (device capabilities, vPort config, steering
parameters) and consolidates debugfs directory lifecycle into
mana_gd_setup()/mana_gd_cleanup_device().
---
Changes in v5:
* Create new patchset including all the the patches.
Changes in v4:
* Rebase and fix conflicts.
Changes in v3:
* Rename mana_gd_cleanup to mana_gd_cleanup_device.
* Add creation of debugfs entries in mana_gd_setup.
* Add removal of debugfs entries in mana_gd_cleanup_device.
* Remove bm_hostmode and num_vports from debugfs in mana_remove itself,
  because "ac" gets freed before debugfs_remove_recursive, to avoid
  Use-After-Free error.
* Add "goto out:" in mana_cfg_vport_steering to avoid populating apc
  values when resp.hdr.status is not NULL.
Changes in v2:
* Add debugfs_remove_recursice for gc>mana_pci_debugfs in
  mana_gd_suspend to handle multiple duplicates creation in
  mana_gd_setup and mana_gd_resume path.
* Move debugfs creation for num_vports and bm_hostmode out of
  if(!resuming) condition since we have to create it again even for
  resume.
* Recreate mana_pci_debugfs in mana_gd_resume.
---
Erni Sri Satya Vennela (3):
  net: mana: Use pci_name() for debugfs directory naming
  net: mana: Move current_speed debugfs file to mana_init_port()
  net: mana: Expose hardware diagnostic info via debugfs

 .../net/ethernet/microsoft/mana/gdma_main.c   | 62 ++++++++++---------
 drivers/net/ethernet/microsoft/mana/mana_en.c | 37 ++++++++++-
 include/net/mana/gdma.h                       |  1 +
 include/net/mana/mana.h                       |  8 +++
 4 files changed, 76 insertions(+), 32 deletions(-)

-- 
2.34.1

[PATCH net-next v5 1/3] net: mana: Use pci_name() for debugfs directory naming

[Erni Sri Satya Vennela]

Use pci_name(pdev) for the per-device debugfs directory instead of
hardcoded "0" for PFs and pci_slot_name(pdev->slot) for VFs. The
previous approach had two issues:

1. pci_slot_name() dereferences pdev->slot, which can be NULL for VFs
   in environments like generic VFIO passthrough or nested KVM,
   causing a NULL pointer dereference.

2. Multiple PFs would all use "0", and VFs across different PCI
   domains or buses could share the same slot name, leading to
   -EEXIST errors from debugfs_create_dir().

pci_name(pdev) returns the unique BDF address, is always valid, and
is unique across the system.

Fixes: 6607c17c6c5e ("net: mana: Enable debugfs files for MANA device")
Signed-off-by: Erni Sri Satya Vennela <ernis@linux.microsoft.com>
---
Changes in v5:
* New to patchset.
Changes in v4, v3, v2:
* Not created
---
 drivers/net/ethernet/microsoft/mana/gdma_main.c | 7 ++-----
 1 file changed, 2 insertions(+), 5 deletions(-)

diff --git a/drivers/net/ethernet/microsoft/mana/gdma_main.c b/drivers/net/ethernet/microsoft/mana/gdma_main.c
index 43741cd35af8..098fbda0d128 100644
--- a/drivers/net/ethernet/microsoft/mana/gdma_main.c
+++ b/drivers/net/ethernet/microsoft/mana/gdma_main.c
@@ -2065,11 +2065,8 @@ static int mana_gd_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 	gc->dev = &pdev->dev;
 	xa_init(&gc->irq_contexts);
 
-	if (gc->is_pf)
-		gc->mana_pci_debugfs = debugfs_create_dir("0", mana_debugfs_root);
-	else
-		gc->mana_pci_debugfs = debugfs_create_dir(pci_slot_name(pdev->slot),
-							  mana_debugfs_root);
+	gc->mana_pci_debugfs = debugfs_create_dir(pci_name(pdev),
+						  mana_debugfs_root);
 
 	err = mana_gd_setup(pdev);
 	if (err)
-- 
2.34.1

Re: [PATCH net-next v5 1/3] net: mana: Use pci_name() for debugfs directory naming

[Simon Horman]

On Thu, Apr 02, 2026 at 11:26:55AM -0700, Erni Sri Satya Vennela wrote:
> Use pci_name(pdev) for the per-device debugfs directory instead of
> hardcoded "0" for PFs and pci_slot_name(pdev->slot) for VFs. The
> previous approach had two issues:
> 
> 1. pci_slot_name() dereferences pdev->slot, which can be NULL for VFs
>    in environments like generic VFIO passthrough or nested KVM,
>    causing a NULL pointer dereference.
> 
> 2. Multiple PFs would all use "0", and VFs across different PCI
>    domains or buses could share the same slot name, leading to
>    -EEXIST errors from debugfs_create_dir().
> 
> pci_name(pdev) returns the unique BDF address, is always valid, and
> is unique across the system.
> 
> Fixes: 6607c17c6c5e ("net: mana: Enable debugfs files for MANA device")
> Signed-off-by: Erni Sri Satya Vennela <ernis@linux.microsoft.com>

Hi Erni,

Possibly the code differs between net and net-next.
But if this is fixing a bug in code present in net - as per the cited
commit - then I think it should be a patch that targets net.
With some strategy for merging that change into net-next
if conflicts are expected.

Re: [PATCH net-next v5 1/3] net: mana: Use pci_name() for debugfs directory naming

[Erni Sri Satya Vennela]

On Sat, Apr 04, 2026 at 10:05:14AM +0100, Simon Horman wrote:
> On Thu, Apr 02, 2026 at 11:26:55AM -0700, Erni Sri Satya Vennela wrote:
> > Use pci_name(pdev) for the per-device debugfs directory instead of
> > hardcoded "0" for PFs and pci_slot_name(pdev->slot) for VFs. The
> > previous approach had two issues:
> > 
> > 1. pci_slot_name() dereferences pdev->slot, which can be NULL for VFs
> >    in environments like generic VFIO passthrough or nested KVM,
> >    causing a NULL pointer dereference.
> > 
> > 2. Multiple PFs would all use "0", and VFs across different PCI
> >    domains or buses could share the same slot name, leading to
> >    -EEXIST errors from debugfs_create_dir().
> > 
> > pci_name(pdev) returns the unique BDF address, is always valid, and
> > is unique across the system.
> > 
> > Fixes: 6607c17c6c5e ("net: mana: Enable debugfs files for MANA device")
> > Signed-off-by: Erni Sri Satya Vennela <ernis@linux.microsoft.com>
> 
> Hi Erni,
> 
> Possibly the code differs between net and net-next.
> But if this is fixing a bug in code present in net - as per the cited
> commit - then I think it should be a patch that targets net.
> With some strategy for merging that change into net-next
> if conflicts are expected.

Thankyou for the clarity Simon.
I will send a separate patchset for net tree with the fixes.

- Vennela

[PATCH net-next v5 2/3] net: mana: Move current_speed debugfs file to mana_init_port()

[Erni Sri Satya Vennela]

Move the current_speed debugfs file creation from mana_probe_port() to
mana_init_port(). The file was previously created only during initial
probe, but mana_cleanup_port_context() removes the entire vPort debugfs
directory during detach/attach cycles. Since mana_init_port() recreates
the directory on re-attach, moving current_speed here ensures it survives
these cycles.

Fixes: 75cabb46935b ("net: mana: Add support for net_shaper_ops")
Signed-off-by: Erni Sri Satya Vennela <ernis@linux.microsoft.com>
---
Changes in v5:
* New to the patchset.
Changes in v4, v3, v2:
* Not created.
---
 drivers/net/ethernet/microsoft/mana/mana_en.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/microsoft/mana/mana_en.c b/drivers/net/ethernet/microsoft/mana/mana_en.c
index 565375cc20d3..78522205c5d0 100644
--- a/drivers/net/ethernet/microsoft/mana/mana_en.c
+++ b/drivers/net/ethernet/microsoft/mana/mana_en.c
@@ -3147,6 +3147,8 @@ static int mana_init_port(struct net_device *ndev)
 	eth_hw_addr_set(ndev, apc->mac_addr);
 	sprintf(vport, "vport%d", port_idx);
 	apc->mana_port_debugfs = debugfs_create_dir(vport, gc->mana_pci_debugfs);
+	debugfs_create_u32("current_speed", 0400, apc->mana_port_debugfs,
+			   &apc->speed);
 	return 0;
 
 reset_apc:
@@ -3425,8 +3427,6 @@ static int mana_probe_port(struct mana_context *ac, int port_idx,
 
 	netif_carrier_on(ndev);
 
-	debugfs_create_u32("current_speed", 0400, apc->mana_port_debugfs, &apc->speed);
-
 	return 0;
 
 free_indir:
-- 
2.34.1

[PATCH net-next v5 3/3] net: mana: Expose hardware diagnostic info via debugfs

[Erni Sri Satya Vennela]

Add debugfs entries to expose hardware configuration and diagnostic
information that aids in debugging driver initialization and runtime
operations without adding noise to dmesg.

The debugfs directory creation and removal for each PCI device is
integrated into mana_gd_setup() and mana_gd_cleanup_device()
respectively, so that all callers (probe, remove, suspend, resume,
shutdown) share a single code path.

Device-level entries (under /sys/kernel/debug/mana/<BDF>/):
  - num_msix_usable, max_num_queues: Max resources from hardware
  - gdma_protocol_ver, pf_cap_flags1: VF version negotiation results
  - num_vports, bm_hostmode: Device configuration

Per-vPort entries (under /sys/kernel/debug/mana/<BDF>/vportN/):
  - port_handle: Hardware vPort handle
  - max_sq, max_rq: Max queues from vPort config
  - indir_table_sz: Indirection table size
  - steer_rx, steer_rss, steer_update_tab, steer_cqe_coalescing:
    Last applied steering configuration parameters

Signed-off-by: Erni Sri Satya Vennela <ernis@linux.microsoft.com>
---
Changes in v5:
* Update commit message.
* Fix conflicts to align with the new patches.
* Make it part of patchset.
Changes in v4:
* Rebase and fix conflicts.
Changes in v3:
* Rename mana_gd_cleanup to mana_gd_cleanup_device.
* Add creation of debugfs entries in mana_gd_setup.
* Add removal of debugfs entries in mana_gd_cleanup_device.
* Remove bm_hostmode and num_vports from debugfs in mana_remove itself,
  because "ac" gets freed before debugfs_remove_recursive, to avoid
  Use-After-Free error.
* Add "goto out:" in mana_cfg_vport_steering to avoid populating apc
  values when resp.hdr.status is not NULL.
Changes in v2:
* Add debugfs_remove_recursice for gc>mana_pci_debugfs in
  mana_gd_suspend to handle multiple duplicates creation in
  mana_gd_setup and mana_gd_resume path.
* Move debugfs creation for num_vports and bm_hostmode out of
  if(!resuming) condition since we have to create it again even for
  resume.
* Recreate mana_pci_debugfs in mana_gd_resume.
---
 .../net/ethernet/microsoft/mana/gdma_main.c   | 59 ++++++++++---------
 drivers/net/ethernet/microsoft/mana/mana_en.c | 33 +++++++++++
 include/net/mana/gdma.h                       |  1 +
 include/net/mana/mana.h                       |  8 +++
 4 files changed, 74 insertions(+), 27 deletions(-)

diff --git a/drivers/net/ethernet/microsoft/mana/gdma_main.c b/drivers/net/ethernet/microsoft/mana/gdma_main.c
index 098fbda0d128..7a99db9afa03 100644
--- a/drivers/net/ethernet/microsoft/mana/gdma_main.c
+++ b/drivers/net/ethernet/microsoft/mana/gdma_main.c
@@ -194,6 +194,11 @@ static int mana_gd_query_max_resources(struct pci_dev *pdev)
 	if (gc->max_num_queues > gc->num_msix_usable - 1)
 		gc->max_num_queues = gc->num_msix_usable - 1;
 
+	debugfs_create_u32("num_msix_usable", 0400, gc->mana_pci_debugfs,
+			   &gc->num_msix_usable);
+	debugfs_create_u32("max_num_queues", 0400, gc->mana_pci_debugfs,
+			   &gc->max_num_queues);
+
 	return 0;
 }
 
@@ -1264,6 +1269,13 @@ int mana_gd_verify_vf_version(struct pci_dev *pdev)
 		return err ? err : -EPROTO;
 	}
 	gc->pf_cap_flags1 = resp.pf_cap_flags1;
+	gc->gdma_protocol_ver = resp.gdma_protocol_ver;
+
+	debugfs_create_x64("gdma_protocol_ver", 0400, gc->mana_pci_debugfs,
+			   &gc->gdma_protocol_ver);
+	debugfs_create_x64("pf_cap_flags1", 0400, gc->mana_pci_debugfs,
+			   &gc->pf_cap_flags1);
+
 	if (resp.pf_cap_flags1 & GDMA_DRV_CAP_FLAG_1_HWC_TIMEOUT_RECONFIG) {
 		err = mana_gd_query_hwc_timeout(pdev, &hwc->hwc_timeout);
 		if (err) {
@@ -1943,15 +1955,20 @@ static int mana_gd_setup(struct pci_dev *pdev)
 	struct gdma_context *gc = pci_get_drvdata(pdev);
 	int err;
 
+	gc->mana_pci_debugfs = debugfs_create_dir(pci_name(pdev),
+						  mana_debugfs_root);
+
 	err = mana_gd_init_registers(pdev);
 	if (err)
-		return err;
+		goto remove_debugfs;
 
 	mana_smc_init(&gc->shm_channel, gc->dev, gc->shm_base);
 
 	gc->service_wq = alloc_ordered_workqueue("gdma_service_wq", 0);
-	if (!gc->service_wq)
-		return -ENOMEM;
+	if (!gc->service_wq) {
+		err = -ENOMEM;
+		goto remove_debugfs;
+	}
 
 	err = mana_gd_setup_hwc_irqs(pdev);
 	if (err) {
@@ -1992,11 +2009,14 @@ static int mana_gd_setup(struct pci_dev *pdev)
 free_workqueue:
 	destroy_workqueue(gc->service_wq);
 	gc->service_wq = NULL;
+remove_debugfs:
+	debugfs_remove_recursive(gc->mana_pci_debugfs);
+	gc->mana_pci_debugfs = NULL;
 	dev_err(&pdev->dev, "%s failed (error %d)\n", __func__, err);
 	return err;
 }
 
-static void mana_gd_cleanup(struct pci_dev *pdev)
+static void mana_gd_cleanup_device(struct pci_dev *pdev)
 {
 	struct gdma_context *gc = pci_get_drvdata(pdev);
 
@@ -2008,6 +2028,10 @@ static void mana_gd_cleanup(struct pci_dev *pdev)
 		destroy_workqueue(gc->service_wq);
 		gc->service_wq = NULL;
 	}
+
+	debugfs_remove_recursive(gc->mana_pci_debugfs);
+	gc->mana_pci_debugfs = NULL;
+
 	dev_dbg(&pdev->dev, "mana gdma cleanup successful\n");
 }
 
@@ -2065,9 +2089,6 @@ static int mana_gd_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 	gc->dev = &pdev->dev;
 	xa_init(&gc->irq_contexts);
 
-	gc->mana_pci_debugfs = debugfs_create_dir(pci_name(pdev),
-						  mana_debugfs_root);
-
 	err = mana_gd_setup(pdev);
 	if (err)
 		goto unmap_bar;
@@ -2096,16 +2117,8 @@ static int mana_gd_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 cleanup_mana:
 	mana_remove(&gc->mana, false);
 cleanup_gd:
-	mana_gd_cleanup(pdev);
+	mana_gd_cleanup_device(pdev);
 unmap_bar:
-	/*
-	 * at this point we know that the other debugfs child dir/files
-	 * are either not yet created or are already cleaned up.
-	 * The pci debugfs folder clean-up now, will only be cleaning up
-	 * adapter-MTU file and apc->mana_pci_debugfs folder.
-	 */
-	debugfs_remove_recursive(gc->mana_pci_debugfs);
-	gc->mana_pci_debugfs = NULL;
 	xa_destroy(&gc->irq_contexts);
 	pci_iounmap(pdev, bar0_va);
 free_gc:
@@ -2155,11 +2168,7 @@ static void mana_gd_remove(struct pci_dev *pdev)
 	mana_rdma_remove(&gc->mana_ib);
 	mana_remove(&gc->mana, false);
 
-	mana_gd_cleanup(pdev);
-
-	debugfs_remove_recursive(gc->mana_pci_debugfs);
-
-	gc->mana_pci_debugfs = NULL;
+	mana_gd_cleanup_device(pdev);
 
 	xa_destroy(&gc->irq_contexts);
 
@@ -2181,7 +2190,7 @@ int mana_gd_suspend(struct pci_dev *pdev, pm_message_t state)
 	mana_rdma_remove(&gc->mana_ib);
 	mana_remove(&gc->mana, true);
 
-	mana_gd_cleanup(pdev);
+	mana_gd_cleanup_device(pdev);
 
 	return 0;
 }
@@ -2220,11 +2229,7 @@ static void mana_gd_shutdown(struct pci_dev *pdev)
 	mana_rdma_remove(&gc->mana_ib);
 	mana_remove(&gc->mana, true);
 
-	mana_gd_cleanup(pdev);
-
-	debugfs_remove_recursive(gc->mana_pci_debugfs);
-
-	gc->mana_pci_debugfs = NULL;
+	mana_gd_cleanup_device(pdev);
 
 	pci_disable_device(pdev);
 }
diff --git a/drivers/net/ethernet/microsoft/mana/mana_en.c b/drivers/net/ethernet/microsoft/mana/mana_en.c
index 78522205c5d0..33464a28e5d5 100644
--- a/drivers/net/ethernet/microsoft/mana/mana_en.c
+++ b/drivers/net/ethernet/microsoft/mana/mana_en.c
@@ -1269,6 +1269,9 @@ static int mana_query_vport_cfg(struct mana_port_context *apc, u32 vport_index,
 	apc->port_handle = resp.vport;
 	ether_addr_copy(apc->mac_addr, resp.mac_addr);
 
+	apc->vport_max_sq = *max_sq;
+	apc->vport_max_rq = *max_rq;
+
 	return 0;
 }
 
@@ -1423,6 +1426,11 @@ static int mana_cfg_vport_steering(struct mana_port_context *apc,
 
 	netdev_info(ndev, "Configured steering vPort %llu entries %u\n",
 		    apc->port_handle, apc->indir_table_sz);
+
+	apc->steer_rx = rx;
+	apc->steer_rss = apc->rss_state;
+	apc->steer_update_tab = update_tab;
+	apc->steer_cqe_coalescing = req->cqe_coalescing_enable;
 out:
 	kfree(req);
 	return err;
@@ -3147,6 +3155,23 @@ static int mana_init_port(struct net_device *ndev)
 	eth_hw_addr_set(ndev, apc->mac_addr);
 	sprintf(vport, "vport%d", port_idx);
 	apc->mana_port_debugfs = debugfs_create_dir(vport, gc->mana_pci_debugfs);
+
+	debugfs_create_u64("port_handle", 0400, apc->mana_port_debugfs,
+			   &apc->port_handle);
+	debugfs_create_u32("max_sq", 0400, apc->mana_port_debugfs,
+			   &apc->vport_max_sq);
+	debugfs_create_u32("max_rq", 0400, apc->mana_port_debugfs,
+			   &apc->vport_max_rq);
+	debugfs_create_u32("indir_table_sz", 0400, apc->mana_port_debugfs,
+			   &apc->indir_table_sz);
+	debugfs_create_u32("steer_rx", 0400, apc->mana_port_debugfs,
+			   &apc->steer_rx);
+	debugfs_create_u32("steer_rss", 0400, apc->mana_port_debugfs,
+			   &apc->steer_rss);
+	debugfs_create_u32("steer_update_tab", 0400, apc->mana_port_debugfs,
+			   &apc->steer_update_tab);
+	debugfs_create_u32("steer_cqe_coalescing", 0400, apc->mana_port_debugfs,
+			   &apc->steer_cqe_coalescing);
 	debugfs_create_u32("current_speed", 0400, apc->mana_port_debugfs,
 			   &apc->speed);
 	return 0;
@@ -3639,6 +3664,11 @@ int mana_probe(struct gdma_dev *gd, bool resuming)
 
 	ac->bm_hostmode = bm_hostmode;
 
+	debugfs_create_u16("num_vports", 0400, gc->mana_pci_debugfs,
+			   &ac->num_ports);
+	debugfs_create_u8("bm_hostmode", 0400, gc->mana_pci_debugfs,
+			  &ac->bm_hostmode);
+
 	if (!resuming) {
 		ac->num_ports = num_ports;
 
@@ -3779,6 +3809,9 @@ void mana_remove(struct gdma_dev *gd, bool suspending)
 
 	mana_gd_deregister_device(gd);
 
+	debugfs_lookup_and_remove("bm_hostmode", gc->mana_pci_debugfs);
+	debugfs_lookup_and_remove("num_vports", gc->mana_pci_debugfs);
+
 	if (suspending)
 		return;
 
diff --git a/include/net/mana/gdma.h b/include/net/mana/gdma.h
index 7fe3a1b61b2d..c4e3ce5147f7 100644
--- a/include/net/mana/gdma.h
+++ b/include/net/mana/gdma.h
@@ -442,6 +442,7 @@ struct gdma_context {
 	struct gdma_dev		mana_ib;
 
 	u64 pf_cap_flags1;
+	u64 gdma_protocol_ver;
 
 	struct workqueue_struct *service_wq;
 
diff --git a/include/net/mana/mana.h b/include/net/mana/mana.h
index 96d21cbbdee2..6d2e05a7368c 100644
--- a/include/net/mana/mana.h
+++ b/include/net/mana/mana.h
@@ -568,6 +568,14 @@ struct mana_port_context {
 
 	/* Debugfs */
 	struct dentry *mana_port_debugfs;
+
+	/* Cached vport/steering config for debugfs */
+	u32 vport_max_sq;
+	u32 vport_max_rq;
+	u32 steer_rx;
+	u32 steer_rss;
+	u32 steer_update_tab;
+	u32 steer_cqe_coalescing;
 };
 
 netdev_tx_t mana_start_xmit(struct sk_buff *skb, struct net_device *ndev);
-- 
2.34.1