[PATCH v2 35/36] net/ionic: retry init commands up to five times

[Andrew Boyer <andrew.boyer@amd.com>]

In some configurations, the FW may return EAGAIN if it is not able
to respond to commands immediately. Retry the init commands in this
case to prevent errors from reaching the client.

Fix up some return-code stuff while here, for clarity.

Signed-off-by: Andrew Boyer <andrew.boyer@amd.com>
---
 drivers/net/ionic/ionic_dev.h  |  1 +
 drivers/net/ionic/ionic_lif.c  | 14 ++++++++++++++
 drivers/net/ionic/ionic_main.c |  4 ++--
 3 files changed, 17 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ionic/ionic_dev.h b/drivers/net/ionic/ionic_dev.h
index 46434f81a4..5e238e8ab7 100644
--- a/drivers/net/ionic/ionic_dev.h
+++ b/drivers/net/ionic/ionic_dev.h
@@ -24,6 +24,7 @@
 
 #define IONIC_DEVCMD_TIMEOUT		5	/* devcmd_timeout */
 #define IONIC_DEVCMD_CHECK_PERIOD_US	10	/* devcmd status chk period */
+#define IONIC_DEVCMD_RETRY_WAIT_US	20000
 
 #define IONIC_ALIGN			4096
 
diff --git a/drivers/net/ionic/ionic_lif.c b/drivers/net/ionic/ionic_lif.c
index 1b5932db12..63635a4b19 100644
--- a/drivers/net/ionic/ionic_lif.c
+++ b/drivers/net/ionic/ionic_lif.c
@@ -1423,10 +1423,17 @@ ionic_lif_adminq_init(struct ionic_lif *lif)
 	struct ionic_admin_qcq *aqcq = lif->adminqcq;
 	struct ionic_queue *q = &aqcq->qcq.q;
 	struct ionic_q_init_comp comp;
+	uint32_t retries = 5;
 	int err;
 
+retry_adminq_init:
 	ionic_dev_cmd_adminq_init(idev, &aqcq->qcq);
 	err = ionic_dev_cmd_wait_check(idev, IONIC_DEVCMD_TIMEOUT);
+	if (err == -EAGAIN && retries > 0) {
+		retries--;
+		rte_delay_us_block(IONIC_DEVCMD_RETRY_WAIT_US);
+		goto retry_adminq_init;
+	}
 	if (err)
 		return err;
 
@@ -1713,12 +1720,19 @@ ionic_lif_init(struct ionic_lif *lif)
 {
 	struct ionic_dev *idev = &lif->adapter->idev;
 	struct ionic_lif_init_comp comp;
+	uint32_t retries = 5;
 	int err;
 
 	memset(&lif->stats_base, 0, sizeof(lif->stats_base));
 
+retry_lif_init:
 	ionic_dev_cmd_lif_init(idev, lif->info_pa);
 	err = ionic_dev_cmd_wait_check(idev, IONIC_DEVCMD_TIMEOUT);
+	if (err == -EAGAIN && retries > 0) {
+		retries--;
+		rte_delay_us_block(IONIC_DEVCMD_RETRY_WAIT_US);
+		goto retry_lif_init;
+	}
 	if (err)
 		return err;
 
diff --git a/drivers/net/ionic/ionic_main.c b/drivers/net/ionic/ionic_main.c
index 05f1e90e30..26e08d06c9 100644
--- a/drivers/net/ionic/ionic_main.c
+++ b/drivers/net/ionic/ionic_main.c
@@ -313,10 +313,10 @@ ionic_dev_cmd_check_error(struct ionic_dev *idev)
 	uint8_t status;
 
 	status = ionic_dev_cmd_status(idev);
-	if (status == 0)
+	if (status == IONIC_RC_SUCCESS)
 		return 0;
 
-	return -EIO;
+	return (status == IONIC_RC_EAGAIN) ? -EAGAIN : -EIO;
 }
 
 int
-- 
2.17.1