ionic: add devlink firmware update

Add support for firmware update through the devlink interface.
This update copies the firmware object into the device, asks
the current firmware to install it, then asks the firmware to
select the new firmware for the next boot-up.

The install and select steps are launched as asynchronous
requests, which are then followed up with status request
commands.  These status request commands will be answered with
an EAGAIN return value and will try again until the request
has completed or reached the timeout specified.

Signed-off-by: Shannon Nelson <snelson@pensando.io>
Acked-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 15 insertions, 8 deletions

diff --git a/drivers/net/ethernet/pensando/ionic/ionic_main.c b/drivers/net/ethernet/pensando/ionic/ionic_main.c
index 99e9dd15a303..e339216949a6 100644
--- a/drivers/net/ethernet/pensando/ionic/ionic_main.c
+++ b/drivers/net/ethernet/pensando/ionic/ionic_main.c
@@ -335,17 +335,22 @@ int ionic_dev_cmd_wait(struct ionic *ionic, unsigned long max_seconds)
 	 */
 	max_wait = jiffies + (max_seconds * HZ);
 try_again:
+	opcode = idev->dev_cmd_regs->cmd.cmd.opcode;
 	start_time = jiffies;
 	do {
 		done = ionic_dev_cmd_done(idev);
 		if (done)
 			break;
-		msleep(5);
-		hb = ionic_heartbeat_check(ionic);
+		usleep_range(100, 200);
+
+		/* Don't check the heartbeat on FW_CONTROL commands as they are
+		 * notorious for interrupting the firmware's heartbeat update.
+		 */
+		if (opcode != IONIC_CMD_FW_CONTROL)
+			hb = ionic_heartbeat_check(ionic);
 	} while (!done && !hb && time_before(jiffies, max_wait));
 	duration = jiffies - start_time;
 
-	opcode = idev->dev_cmd_regs->cmd.cmd.opcode;
 	dev_dbg(ionic->dev, "DEVCMD %s (%d) done=%d took %ld secs (%ld jiffies)\n",
 		ionic_opcode_to_str(opcode), opcode,
 		done, duration / HZ, duration);
@@ -369,8 +374,9 @@ try_again:
 
 	err = ionic_dev_cmd_status(&ionic->idev);
 	if (err) {
-		if (err == IONIC_RC_EAGAIN && !time_after(jiffies, max_wait)) {
-			dev_err(ionic->dev, "DEV_CMD %s (%d) error, %s (%d) retrying...\n",
+		if (err == IONIC_RC_EAGAIN &&
+		    time_before(jiffies, (max_wait - HZ))) {
+			dev_dbg(ionic->dev, "DEV_CMD %s (%d), %s (%d) retrying...\n",
 				ionic_opcode_to_str(opcode), opcode,
 				ionic_error_to_str(err), err);
 
@@ -380,9 +386,10 @@ try_again:
 			goto try_again;
 		}
 
-		dev_err(ionic->dev, "DEV_CMD %s (%d) error, %s (%d) failed\n",
-			ionic_opcode_to_str(opcode), opcode,
-			ionic_error_to_str(err), err);
+		if (!(opcode == IONIC_CMD_FW_CONTROL && err == IONIC_RC_EAGAIN))
+			dev_err(ionic->dev, "DEV_CMD %s (%d) error, %s (%d) failed\n",
+				ionic_opcode_to_str(opcode), opcode,
+				ionic_error_to_str(err), err);
 
 		return ionic_error_to_errno(err);
 	}