ice: implement device flash update via devlink

Use the newly added pldmfw library to implement device flash update for
the Intel ice networking device driver. This support uses the devlink
flash update interface.

The main parts of the flash include the Option ROM, the netlist module,
and the main NVM data. The PLDM firmware file contains modules for each
of these components.

Using the pldmfw library, the provided firmware file will be scanned for
the three major components, "fw.undi" for the Option ROM, "fw.mgmt" for
the main NVM module containing the primary device firmware, and
"fw.netlist" containing the netlist module.

The flash is separated into two banks, the active bank containing the
running firmware, and the inactive bank which we use for update. Each
module is updated in a staged process. First, the inactive bank is
erased, preparing the device for update. Second, the contents of the
component are copied to the inactive portion of the flash. After all
components are updated, the driver signals the device to switch the
active bank during the next EMP reset (which would usually occur during
the next reboot).

Although the firmware AdminQ interface does report an immediate status
for each command, the NVM erase and NVM write commands receive status
asynchronously. The driver must not continue writing until previous
erase and write commands have finished. The real status of the NVM
commands is returned over the receive AdminQ. Implement a simple
interface that uses a wait queue so that the main update thread can
sleep until the completion status is reported by firmware. For erasing
the inactive banks, this can take quite a while in practice.

To help visualize the process to the devlink application and other
applications based on the devlink netlink interface, status is reported
via the devlink_flash_update_status_notify. While we do report status
after each 4k block when writing, there is no real status we can report
during erasing. We simply must wait for the complete module erasure to
finish.

With this implementation, basic flash update for the ice hardware is
supported.

Signed-off-by: Jacob Keller <jacob.e.keller@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 54 insertions, 0 deletions

diff --git a/drivers/net/ethernet/intel/ice/ice_devlink.c b/drivers/net/ethernet/intel/ice/ice_devlink.c
index 43da2dcb0cbc..dbbd8b6f9d1a 100644
--- a/drivers/net/ethernet/intel/ice/ice_devlink.c
+++ b/drivers/net/ethernet/intel/ice/ice_devlink.c
@@ -4,6 +4,7 @@
 #include "ice.h"
 #include "ice_lib.h"
 #include "ice_devlink.h"
+#include "ice_fw_update.h"
 
 static int ice_info_get_dsn(struct ice_pf *pf, char *buf, size_t len)
 {
@@ -229,8 +230,61 @@ static int ice_devlink_info_get(struct devlink *devlink,
 	return 0;
 }
 
+/**
+ * ice_devlink_flash_update - Update firmware stored in flash on the device
+ * @devlink: pointer to devlink associated with device to update
+ * @path: the path of the firmware file to use via request_firmware
+ * @component: name of the component to update, or NULL
+ * @extack: netlink extended ACK structure
+ *
+ * Perform a device flash update. The bulk of the update logic is contained
+ * within the ice_flash_pldm_image function.
+ *
+ * Returns: zero on success, or an error code on failure.
+ */
+static int
+ice_devlink_flash_update(struct devlink *devlink, const char *path,
+			 const char *component, struct netlink_ext_ack *extack)
+{
+	struct ice_pf *pf = devlink_priv(devlink);
+	struct device *dev = &pf->pdev->dev;
+	struct ice_hw *hw = &pf->hw;
+	const struct firmware *fw;
+	int err;
+
+	/* individual component update is not yet supported */
+	if (component)
+		return -EOPNOTSUPP;
+
+	if (!hw->dev_caps.common_cap.nvm_unified_update) {
+		NL_SET_ERR_MSG_MOD(extack, "Current firmware does not support unified update");
+		return -EOPNOTSUPP;
+	}
+
+	err = ice_check_for_pending_update(pf, component, extack);
+	if (err)
+		return err;
+
+	err = request_firmware(&fw, path, dev);
+	if (err) {
+		NL_SET_ERR_MSG_MOD(extack, "Unable to read file from disk");
+		return err;
+	}
+
+	devlink_flash_update_begin_notify(devlink);
+	devlink_flash_update_status_notify(devlink, "Preparing to flash",
+					   component, 0, 0);
+	err = ice_flash_pldm_image(pf, fw, extack);
+	devlink_flash_update_end_notify(devlink);
+
+	release_firmware(fw);
+
+	return err;
+}
+
 static const struct devlink_ops ice_devlink_ops = {
 	.info_get = ice_devlink_info_get,
+	.flash_update = ice_devlink_flash_update,
 };
 
 static void ice_devlink_free(void *devlink_ptr)