[Intel-wired-lan] [PATCH net-next 2/2] ice: use shared devlink to store ice_adapters instead of custom xarray
Przemek Kitszel
przemyslaw.kitszel at intel.com
Tue Apr 28 09:09:12 UTC 2026
Refactor our storage and deduplication logic of ice_adapters by moving
it to be handled by shared devlink instance, recently added by
Jiri Pirko [1].
We wanted the devlink instance for whole device anyway - later in the
series I will add devlink resources under it.
Make the shared devlink a parent (wrt. nesting) of the actual PF devices.
[1] commit 411ad0605875 ("Merge branch 'devlink-introduce-shared-devlink-instance-for-pfs-on-same-chip'")
[1] https://lore.kernel.org/all/20260312100407.551173-1-jiri@resnulli.us
Reviewed-by: Jedrzej Jagielski <jedrzej.jagielski at intel.com>
Reviewed-by: Aleksandr Loktionov <aleksandr.loktionov at intel.com>
Signed-off-by: Przemek Kitszel <przemyslaw.kitszel at intel.com>
---
CC: Sergey Temerkhanov <sergey.temerkhanov at intel.com>
---
drivers/net/ethernet/intel/ice/ice_adapter.h | 13 +--
.../net/ethernet/intel/ice/devlink/devlink.c | 3 +
drivers/net/ethernet/intel/ice/ice_adapter.c | 95 ++++++-------------
drivers/net/ethernet/intel/ice/ice_main.c | 4 +-
4 files changed, 42 insertions(+), 73 deletions(-)
diff --git a/drivers/net/ethernet/intel/ice/ice_adapter.h b/drivers/net/ethernet/intel/ice/ice_adapter.h
index e95266c7f20b..d4ec7e78abb4 100644
--- a/drivers/net/ethernet/intel/ice/ice_adapter.h
+++ b/drivers/net/ethernet/intel/ice/ice_adapter.h
@@ -6,7 +6,8 @@
#include <linux/types.h>
#include <linux/spinlock_types.h>
-#include <linux/refcount_types.h>
+
+#include <net/devlink.h>
struct pci_dev;
struct ice_pf;
@@ -27,27 +28,26 @@ struct ice_port_list {
/**
* struct ice_adapter - PCI adapter resources shared across PFs
- * @refcount: Reference count. struct ice_pf objects hold the references.
+ * @devlink: ice adapter's devlink (whole dev devlink)
* @ptp_gltsyn_time_lock: Spinlock protecting access to the GLTSYN_TIME
* register of the PTP clock.
* @txq_ctx_lock: Spinlock protecting access to the GLCOMM_QTX_CNTX_CTL register
* @ctrl_pf: Control PF of the adapter
* @ports: Ports list
- * @index: 64-bit index cached for collision detection on 32bit systems
*/
struct ice_adapter {
- refcount_t refcount;
+ struct devlink *devlink;
+
/* For access to the GLTSYN_TIME register */
spinlock_t ptp_gltsyn_time_lock;
/* For access to GLCOMM_QTX_CNTX_CTL register */
spinlock_t txq_ctx_lock;
struct ice_pf *ctrl_pf;
struct ice_port_list ports;
- u64 index;
};
struct ice_adapter *ice_adapter_get(struct pci_dev *pdev);
-void ice_adapter_put(struct pci_dev *pdev);
+void ice_adapter_put(struct ice_adapter *adapter);
#endif /* _ICE_ADAPTER_H */
diff --git a/drivers/net/ethernet/intel/ice/devlink/devlink.c b/drivers/net/ethernet/intel/ice/devlink/devlink.c
index 641d6e289d5c..f6382d038048 100644
--- a/drivers/net/ethernet/intel/ice/devlink/devlink.c
+++ b/drivers/net/ethernet/intel/ice/devlink/devlink.c
@@ -1750,7 +1750,10 @@ struct ice_sf_priv *ice_allocate_sf(struct device *dev, struct ice_pf *pf)
void ice_devlink_register(struct ice_pf *pf)
{
struct devlink *devlink = priv_to_devlink(pf);
+ struct ice_adapter *adapter = pf->adapter;
+ if (adapter)
+ devl_nested_devlink_set(adapter->devlink, devlink);
devl_register(devlink);
}
diff --git a/drivers/net/ethernet/intel/ice/ice_adapter.c b/drivers/net/ethernet/intel/ice/ice_adapter.c
index cbb57060bd56..8ec1b600905f 100644
--- a/drivers/net/ethernet/intel/ice/ice_adapter.c
+++ b/drivers/net/ethernet/intel/ice/ice_adapter.c
@@ -1,18 +1,13 @@
// SPDX-License-Identifier: GPL-2.0-only
// SPDX-FileCopyrightText: Copyright Red Hat
-#include <linux/cleanup.h>
-#include <linux/mutex.h>
#include <linux/pci.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
-#include <linux/xarray.h>
+
#include "ice_adapter.h"
#include "ice.h"
-static DEFINE_XARRAY(ice_adapters);
-static DEFINE_MUTEX(ice_adapters_mutex);
-
#define ICE_ADAPTER_FIXED_INDEX BIT_ULL(63)
#define ICE_ADAPTER_INDEX_E825C \
@@ -40,44 +35,36 @@ static u64 ice_adapter_index(struct pci_dev *pdev)
}
}
-static unsigned long ice_adapter_xa_index(struct pci_dev *pdev)
-{
- u64 index = ice_adapter_index(pdev);
-
-#if BITS_PER_LONG == 64
- return index;
-#else
- return (u32)index ^ (u32)(index >> 32);
-#endif
-}
-
-static struct ice_adapter *ice_adapter_new(struct pci_dev *pdev)
+static int ice_adapter_init(void *priv, void *init_param)
{
- struct ice_adapter *adapter;
+ struct ice_adapter *adapter = priv;
+ struct devlink *devlink;
- adapter = kzalloc_obj(*adapter);
- if (!adapter)
- return NULL;
+ devlink = shd_priv_to_devlink(adapter);
+ adapter->devlink = devlink;
- adapter->index = ice_adapter_index(pdev);
spin_lock_init(&adapter->ptp_gltsyn_time_lock);
spin_lock_init(&adapter->txq_ctx_lock);
- refcount_set(&adapter->refcount, 1);
mutex_init(&adapter->ports.lock);
INIT_LIST_HEAD(&adapter->ports.ports);
- return adapter;
+ return 0;
}
-static void ice_adapter_free(struct ice_adapter *adapter)
+static void ice_adapter_fini(void *priv)
{
+ struct ice_adapter *adapter = priv;
+
WARN_ON(!list_empty(&adapter->ports.ports));
mutex_destroy(&adapter->ports.lock);
-
- kfree(adapter);
}
+static const struct devlink_ops ice_adapter_devlink_ops = {
+ .shd_init = ice_adapter_init,
+ .shd_fini = ice_adapter_fini,
+};
+
/**
* ice_adapter_get - Get a shared ice_adapter structure.
* @pdev: Pointer to the pci_dev whose driver is getting the ice_adapter.
@@ -94,28 +81,19 @@ static void ice_adapter_free(struct ice_adapter *adapter)
struct ice_adapter *ice_adapter_get(struct pci_dev *pdev)
{
struct ice_adapter *adapter;
- unsigned long index;
- int err;
-
- index = ice_adapter_xa_index(pdev);
- scoped_guard(mutex, &ice_adapters_mutex) {
- adapter = xa_load(&ice_adapters, index);
- if (adapter) {
- refcount_inc(&adapter->refcount);
- WARN_ON_ONCE(adapter->index != ice_adapter_index(pdev));
- return adapter;
- }
- err = xa_reserve(&ice_adapters, index, GFP_KERNEL);
- if (err)
- return ERR_PTR(err);
-
- adapter = ice_adapter_new(pdev);
- if (!adapter) {
- xa_release(&ice_adapters, index);
- return ERR_PTR(-ENOMEM);
- }
- xa_store(&ice_adapters, index, adapter, GFP_KERNEL);
- }
+ struct devlink *devlink;
+ char devlink_id[32];
+ u64 index;
+
+ index = ice_adapter_index(pdev);
+ snprintf(devlink_id, sizeof(devlink_id), "%llx", index);
+ devlink = devlink_shd_get(devlink_id, &ice_adapter_devlink_ops,
+ sizeof(*adapter), NULL, pdev->dev.driver);
+ if (!devlink)
+ return ERR_PTR(-ENOMEM);
+
+ adapter = devlink_shd_get_priv(devlink);
+
return adapter;
}
@@ -128,20 +106,7 @@ struct ice_adapter *ice_adapter_get(struct pci_dev *pdev)
*
* Context: Process, may sleep.
*/
-void ice_adapter_put(struct pci_dev *pdev)
+void ice_adapter_put(struct ice_adapter *adapter)
{
- struct ice_adapter *adapter;
- unsigned long index;
-
- index = ice_adapter_xa_index(pdev);
- scoped_guard(mutex, &ice_adapters_mutex) {
- adapter = xa_load(&ice_adapters, index);
- if (WARN_ON(!adapter))
- return;
- if (!refcount_dec_and_test(&adapter->refcount))
- return;
-
- WARN_ON(xa_erase(&ice_adapters, index) != adapter);
- }
- ice_adapter_free(adapter);
+ devlink_shd_put(adapter->devlink);
}
diff --git a/drivers/net/ethernet/intel/ice/ice_main.c b/drivers/net/ethernet/intel/ice/ice_main.c
index 6ebaa41127a4..6e257ad13bd1 100644
--- a/drivers/net/ethernet/intel/ice/ice_main.c
+++ b/drivers/net/ethernet/intel/ice/ice_main.c
@@ -5349,7 +5349,7 @@ ice_probe(struct pci_dev *pdev, const struct pci_device_id __always_unused *ent)
unroll_dev_init:
need_dev_deinit = true;
unroll_adapter:
- ice_adapter_put(pdev);
+ ice_adapter_put(adapter);
unroll_hw_init:
ice_deinit_hw(hw);
if (need_dev_deinit)
@@ -5462,7 +5462,7 @@ static void ice_remove(struct pci_dev *pdev)
ice_setup_mc_magic_wake(pf);
ice_set_wake(pf);
- ice_adapter_put(pdev);
+ ice_adapter_put(pf->adapter);
ice_deinit_hw(&pf->hw);
ice_deinit_dev(pf);
--
2.39.3
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