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@intel.com>
Reviewed-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/Documentation/networking/devlink/ice.rst b/Documentation/networking/devlink/ice.rst
index 37fbbd4..f3d6a3b 100644 (file)
--- 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 8ce3afc..5c11448 100644 (file)
--- 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 27c5034..c683394 100644 (file)
--- a/drivers/net/ethernet/intel/ice/ice_devlink.c
+++ b/drivers/net/ethernet/intel/ice/ice_devlink.c
@@ -318,3 +318,99 @@ 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)
+               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_err(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 f94dc93..6e806a0 100644 (file)
--- 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 359ff85..306a4e5 100644 (file)
--- 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 @@ err_init_interrupt_unroll:
        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);