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Message-Id: <20200324223445.2077900-11-jacob.e.keller@intel.com>
Date: Tue, 24 Mar 2020 15:34:45 -0700
From: Jacob Keller <jacob.e.keller@...el.com>
To: netdev@...r.kernel.org
Cc: Jakub Kicinski <kuba@...nel.org>, Jiri Pirko <jiri@...nulli.us>,
Jacob Keller <jacob.e.keller@...el.com>
Subject: [PATCH 10/10] ice: add a devlink region for dumping NVM contents
Add a devlink region for exposing the device's Non Volatime Memory flash
contents.
Support the recently added .snapshot operation, enabling userspace to
request a snapshot of the NVM contents via DEVLINK_CMD_REGION_NEW.
Signed-off-by: Jacob Keller <jacob.e.keller@...el.com>
---
Documentation/networking/devlink/ice.rst | 26 +++++
drivers/net/ethernet/intel/ice/ice.h | 2 +
drivers/net/ethernet/intel/ice/ice_devlink.c | 99 ++++++++++++++++++++
drivers/net/ethernet/intel/ice/ice_devlink.h | 3 +
drivers/net/ethernet/intel/ice/ice_main.c | 4 +
5 files changed, 134 insertions(+)
diff --git a/Documentation/networking/devlink/ice.rst b/Documentation/networking/devlink/ice.rst
index 37fbbd40a5e5..f3d6a3b50342 100644
--- a/Documentation/networking/devlink/ice.rst
+++ b/Documentation/networking/devlink/ice.rst
@@ -69,3 +69,29 @@ The ``ice`` driver reports the following versions
- The version of the DDP package that is active in the device. Note
that both the name (as reported by ``fw.app.name``) and version are
required to uniquely identify the package.
+
+Regions
+=======
+
+The ``ice`` driver enables access to the contents of the Non Volatile Memory
+flash chip via the ``nvm-flash`` region.
+
+Users can request an immediate capture of a snapshot via the
+``DEVLINK_CMD_REGION_NEW``
+
+.. code:: shell
+
+ $ devlink region new pci/0000:01:00.0/nvm-flash snapshot 1
+ $ devlink region dump pci/0000:01:00.0/nvm-flash snapshot 1
+
+ $ devlink region dump pci/0000:01:00.0/nvm-flash snapshot 1
+ 0000000000000000 0014 95dc 0014 9514 0035 1670 0034 db30
+ 0000000000000010 0000 0000 ffff ff04 0029 8c00 0028 8cc8
+ 0000000000000020 0016 0bb8 0016 1720 0000 0000 c00f 3ffc
+ 0000000000000030 bada cce5 bada cce5 bada cce5 bada cce5
+
+ $ devlink region read pci/0000:01:00.0/nvm-flash snapshot 1 address 0
+ length 16
+ 0000000000000000 0014 95dc 0014 9514 0035 1670 0034 db30
+
+ $ devlink region delete pci/0000:01:00.0/nvm-flash snapshot 1
diff --git a/drivers/net/ethernet/intel/ice/ice.h b/drivers/net/ethernet/intel/ice/ice.h
index 8ce3afcfeca0..5c11448bfbb3 100644
--- a/drivers/net/ethernet/intel/ice/ice.h
+++ b/drivers/net/ethernet/intel/ice/ice.h
@@ -351,6 +351,8 @@ struct ice_pf {
/* devlink port data */
struct devlink_port devlink_port;
+ struct devlink_region *nvm_region;
+
/* OS reserved IRQ details */
struct msix_entry *msix_entries;
struct ice_res_tracker *irq_tracker;
diff --git a/drivers/net/ethernet/intel/ice/ice_devlink.c b/drivers/net/ethernet/intel/ice/ice_devlink.c
index 27c5034c039a..9dd1b21820bf 100644
--- a/drivers/net/ethernet/intel/ice/ice_devlink.c
+++ b/drivers/net/ethernet/intel/ice/ice_devlink.c
@@ -318,3 +318,102 @@ void ice_devlink_destroy_port(struct ice_pf *pf)
devlink_port_type_clear(&pf->devlink_port);
devlink_port_unregister(&pf->devlink_port);
}
+
+/**
+ * ice_devlink_nvm_snapshot - Capture a snapshot of the Shadow RAM contents
+ * @devlink: the devlink instance
+ * @extack: extended ACK response structure
+ * @data: on exit points to snapshot data buffer
+ *
+ * This function is called in response to the DEVLINK_CMD_REGION_TRIGGER for
+ * the shadow-ram devlink region. It captures a snapshot of the shadow ram
+ * contents. This snapshot can later be viewed via the devlink-region
+ * interface.
+ *
+ * @returns zero on success, and updates the data pointer. Returns a non-zero
+ * error code on failure.
+ */
+static int
+ice_devlink_nvm_snapshot(struct devlink *devlink, struct netlink_ext_ack *extack,
+ u8 **data)
+{
+ struct ice_pf *pf = devlink_priv(devlink);
+ struct device *dev = ice_pf_to_dev(pf);
+ struct ice_hw *hw = &pf->hw;
+ enum ice_status status;
+ void *nvm_data;
+ u32 nvm_size;
+
+ nvm_size = hw->nvm.flash_size;
+ nvm_data = vzalloc(nvm_size);
+ if (!nvm_data) {
+ NL_SET_ERR_MSG_MOD(extack, "Out of memory");
+ return -ENOMEM;
+ }
+
+ status = ice_acquire_nvm(hw, ICE_RES_READ);
+ if (status) {
+ dev_dbg(dev, "ice_acquire_nvm failed, err %d aq_err %d\n",
+ status, hw->adminq.sq_last_status);
+ NL_SET_ERR_MSG_MOD(extack, "Failed to acquire NVM semaphore");
+ vfree(nvm_data);
+ return -EIO;
+ }
+
+ status = ice_read_flat_nvm(hw, 0, &nvm_size, nvm_data, false);
+ if (status) {
+ dev_dbg(dev, "ice_read_flat_nvm failed after reading %u bytes, err %d aq_err %d\n",
+ nvm_size, status, hw->adminq.sq_last_status);
+ NL_SET_ERR_MSG_MOD(extack, "Failed to read NVM contents");
+ ice_release_nvm(hw);
+ vfree(nvm_data);
+ return -EIO;
+ }
+
+ ice_release_nvm(hw);
+
+ *data = nvm_data;
+
+ return 0;
+}
+
+static const struct devlink_region_ops ice_nvm_region_ops = {
+ .name = "nvm-flash",
+ .destructor = vfree,
+ .snapshot = ice_devlink_nvm_snapshot,
+};
+
+/**
+ * ice_devlink_init_regions - Initialize devlink regions
+ * @pf: the PF device structure
+ *
+ * Create devlink regions used to enable access to dump the contents of the
+ * flash memory on the device.
+ */
+void ice_devlink_init_regions(struct ice_pf *pf)
+{
+ struct devlink *devlink = priv_to_devlink(pf);
+ struct device *dev = ice_pf_to_dev(pf);
+ u64 nvm_size;
+
+ nvm_size = pf->hw.nvm.flash_size;
+ pf->nvm_region = devlink_region_create(devlink, &ice_nvm_region_ops, 1,
+ nvm_size);
+ if (IS_ERR(pf->nvm_region)) {
+ dev_warn(dev, "failed to create NVM devlink region, err %ld\n",
+ PTR_ERR(pf->nvm_region));
+ pf->nvm_region = NULL;
+ }
+}
+
+/**
+ * ice_devlink_destroy_regions - Destroy devlink regions
+ * @pf: the PF device structure
+ *
+ * Remove previously created regions for this PF.
+ */
+void ice_devlink_destroy_regions(struct ice_pf *pf)
+{
+ if (pf->nvm_region)
+ devlink_region_destroy(pf->nvm_region);
+}
diff --git a/drivers/net/ethernet/intel/ice/ice_devlink.h b/drivers/net/ethernet/intel/ice/ice_devlink.h
index f94dc93c24c5..6e806a08dc23 100644
--- a/drivers/net/ethernet/intel/ice/ice_devlink.h
+++ b/drivers/net/ethernet/intel/ice/ice_devlink.h
@@ -11,4 +11,7 @@ void ice_devlink_unregister(struct ice_pf *pf);
int ice_devlink_create_port(struct ice_pf *pf);
void ice_devlink_destroy_port(struct ice_pf *pf);
+void ice_devlink_init_regions(struct ice_pf *pf);
+void ice_devlink_destroy_regions(struct ice_pf *pf);
+
#endif /* _ICE_DEVLINK_H_ */
diff --git a/drivers/net/ethernet/intel/ice/ice_main.c b/drivers/net/ethernet/intel/ice/ice_main.c
index 359ff8544773..306a4e5b2320 100644
--- a/drivers/net/ethernet/intel/ice/ice_main.c
+++ b/drivers/net/ethernet/intel/ice/ice_main.c
@@ -3276,6 +3276,8 @@ ice_probe(struct pci_dev *pdev, const struct pci_device_id __always_unused *ent)
goto err_init_pf_unroll;
}
+ ice_devlink_init_regions(pf);
+
pf->num_alloc_vsi = hw->func_caps.guar_num_vsi;
if (!pf->num_alloc_vsi) {
err = -EIO;
@@ -3385,6 +3387,7 @@ ice_probe(struct pci_dev *pdev, const struct pci_device_id __always_unused *ent)
devm_kfree(dev, pf->vsi);
err_init_pf_unroll:
ice_deinit_pf(pf);
+ ice_devlink_destroy_regions(pf);
ice_deinit_hw(hw);
err_exit_unroll:
ice_devlink_unregister(pf);
@@ -3427,6 +3430,7 @@ static void ice_remove(struct pci_dev *pdev)
ice_vsi_free_q_vectors(pf->vsi[i]);
}
ice_deinit_pf(pf);
+ ice_devlink_destroy_regions(pf);
ice_deinit_hw(&pf->hw);
ice_devlink_unregister(pf);
--
2.24.1
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