[PATCH net-next v7] net: mana: Expose hardware diagnostic info via debugfs

[PATCH net-next v7] 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 for each PCI device is named using pci_name()
(the unique BDF address), and its creation and removal 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 v7:
* Rebase to latest main.
Changes in v6:
* Move out of patchset and create a separate patch.
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   | 68 +++++++++++--------
 drivers/net/ethernet/microsoft/mana/mana_en.c | 33 +++++++++
 include/net/mana/gdma.h                       |  1 +
 include/net/mana/mana.h                       |  8 +++
 4 files changed, 81 insertions(+), 29 deletions(-)

diff --git a/drivers/net/ethernet/microsoft/mana/gdma_main.c b/drivers/net/ethernet/microsoft/mana/gdma_main.c
index 098fbda0d128..33fd7d9259c9 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;
 }
@@ -2201,13 +2210,18 @@ int mana_gd_resume(struct pci_dev *pdev)
 
 	err = mana_probe(&gc->mana, true);
 	if (err)
-		return err;
+		goto cleanup_gd;
 
 	err = mana_rdma_probe(&gc->mana_ib);
 	if (err)
-		return err;
+		goto cleanup_mana;
 
 	return 0;
+cleanup_mana:
+	mana_remove(&gc->mana, true);
+cleanup_gd:
+	mana_gd_cleanup_device(pdev);
+	return err;
 }
 
 /* Quiesce the device for kexec. This is also called upon reboot/shutdown. */
@@ -2220,11 +2234,7 @@ 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 a654b3699c4c..077d3a1ff6bf 100644
--- a/drivers/net/ethernet/microsoft/mana/mana_en.c
+++ b/drivers/net/ethernet/microsoft/mana/mana_en.c
@@ -1276,6 +1276,9 @@ 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;
 }
 
@@ -1430,6 +1433,11 @@ 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;
@@ -3161,6 +3169,23 @@ 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;
@@ -3659,6 +3684,11 @@ 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;
 	} else {
@@ -3800,6 +3830,9 @@ 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 6d836060976a..70d62bc32837 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 8f721cd4e4a7..18215388d2c7 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);
-- 
2.43.0

Re: [PATCH net-next v7] net: mana: Expose hardware diagnostic info via debugfs

[Jakub Kicinski]

This is an AI-generated review of your patch. The human sending this
email has considered the AI review valid, or at least plausible.
---
net: mana: Expose hardware diagnostic info via debugfs

This patch adds debugfs entries under /sys/kernel/debug/mana/<BDF>/ to
expose device-level and per-vPort hardware configuration and diagnostic
information. Debugfs creation and removal are moved into mana_gd_setup()
and a renamed mana_gd_cleanup_device() so probe, remove, suspend, resume
and shutdown share a single path.

> diff --git a/drivers/net/ethernet/microsoft/mana/mana_en.c b/drivers/net/ethernet/microsoft/mana/mana_en.c
> index a654b3699c4c..077d3a1ff6bf 100644
> --- a/drivers/net/ethernet/microsoft/mana/mana_en.c
> +++ b/drivers/net/ethernet/microsoft/mana/mana_en.c

[ ... ]

> @@ -3659,6 +3684,11 @@ 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;
>  	} else {

Is the num_vports debugfs file pointed at ac->num_ports before that
field has been assigned from the queried num_ports value?

On a fresh probe (!resuming), the sequence in mana_probe() is:

    err = mana_query_device_cfg(ac, ..., &num_ports, &bm_hostmode);
    ...
    ac->bm_hostmode = bm_hostmode;

    debugfs_create_u16("num_vports", 0400, gc->mana_pci_debugfs,
                       &ac->num_ports);
    ...

    if (!resuming) {
            ac->num_ports = num_ports;
    } else {
            ...
    }
    ...
    if (ac->num_ports > MAX_PORTS_IN_MANA_DEV)
            ac->num_ports = MAX_PORTS_IN_MANA_DEV;

During the window between debugfs_create_u16() and the assignment (and
subsequent clamp to MAX_PORTS_IN_MANA_DEV), would a reader of the
num_vports debugfs file observe 0 rather than the hardware-reported
value?

Would it be clearer to create this file after ac->num_ports has been
assigned and clamped, so the exposed value matches what the commit
message describes as "Device configuration"?
-- 
pw-bot: cr

Re: [PATCH net-next v7] net: mana: Expose hardware diagnostic info via debugfs

[Erni Sri Satya Vennela]

On Fri, May 01, 2026 at 05:54:09PM -0700, Jakub Kicinski wrote:
> This is an AI-generated review of your patch. The human sending this
> email has considered the AI review valid, or at least plausible.
> ---
> net: mana: Expose hardware diagnostic info via debugfs
> 
> This patch adds debugfs entries under /sys/kernel/debug/mana/<BDF>/ to
> expose device-level and per-vPort hardware configuration and diagnostic
> information. Debugfs creation and removal are moved into mana_gd_setup()
> and a renamed mana_gd_cleanup_device() so probe, remove, suspend, resume
> and shutdown share a single path.
> 
> > diff --git a/drivers/net/ethernet/microsoft/mana/mana_en.c b/drivers/net/ethernet/microsoft/mana/mana_en.c
> > index a654b3699c4c..077d3a1ff6bf 100644
> > --- a/drivers/net/ethernet/microsoft/mana/mana_en.c
> > +++ b/drivers/net/ethernet/microsoft/mana/mana_en.c
> 
> [ ... ]
> 
> > @@ -3659,6 +3684,11 @@ 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;
> >  	} else {
> 
> Is the num_vports debugfs file pointed at ac->num_ports before that
> field has been assigned from the queried num_ports value?
> 
> On a fresh probe (!resuming), the sequence in mana_probe() is:
> 
>     err = mana_query_device_cfg(ac, ..., &num_ports, &bm_hostmode);
>     ...
>     ac->bm_hostmode = bm_hostmode;
> 
>     debugfs_create_u16("num_vports", 0400, gc->mana_pci_debugfs,
>                        &ac->num_ports);
>     ...
> 
>     if (!resuming) {
>             ac->num_ports = num_ports;
>     } else {
>             ...
>     }
>     ...
>     if (ac->num_ports > MAX_PORTS_IN_MANA_DEV)
>             ac->num_ports = MAX_PORTS_IN_MANA_DEV;
> 
> During the window between debugfs_create_u16() and the assignment (and
> subsequent clamp to MAX_PORTS_IN_MANA_DEV), would a reader of the
> num_vports debugfs file observe 0 rather than the hardware-reported
> value?
> 
> Would it be clearer to create this file after ac->num_ports has been
> assigned and clamped, so the exposed value matches what the commit
> message describes as "Device configuration"?
> -- 
> pw-bot: cr
Thankyou for pointing out, Jakub.
I will update the comment in the next version.

- Vennela