net: ena: Remove autopolling mode

JIRA: https://issues.redhat.com/browse/RHEL-94831

commit b356b91
Author: Dr. David Alan Gilbert <linux@treblig.org>
Date:   Sun Nov 3 19:41:49 2024 +0000

    net: ena: Remove autopolling mode

    This manually reverts
    commit a4e262c ("net: ena: allow automatic fallback to polling mode")

    which is unused.

    (I did it manually because there are other minor comment
    and function changes surrounding it).
    Build tested only.

    Suggested-by: David Arinzon <darinzon@amazon.com>
    Signed-off-by: Dr. David Alan Gilbert <linux@treblig.org>
    Link: https://patch.msgid.link/20241103194149.293456-1-linux@treblig.org
    Signed-off-by: Jakub Kicinski <kuba@kernel.org>

Signed-off-by: Dennis Chen <dechen@redhat.com>

Author: dchen5022

drivers/net/ethernet/amazon/ena/ena_com.c

@@ -763,25 +763,16 @@ static int ena_com_wait_and_process_admin_cq_interrupts(struct ena_comp_ctx *com
 
 		if (comp_ctx->status == ENA_CMD_COMPLETED) {
 			netdev_err(admin_queue->ena_dev->net_device,
-				   "The ena device sent a completion but the driver didn't receive a MSI-X interrupt (cmd %d), autopolling mode is %s\n",
-				   comp_ctx->cmd_opcode, admin_queue->auto_polling ? "ON" : "OFF");
-			/* Check if fallback to polling is enabled */
-			if (admin_queue->auto_polling)
-				admin_queue->polling = true;
+				   "The ena device sent a completion but the driver didn't receive a MSI-X interrupt (cmd %d)\n",
+				   comp_ctx->cmd_opcode);
 		} else {
 			netdev_err(admin_queue->ena_dev->net_device,
 				   "The ena device didn't send a completion for the admin cmd %d status %d\n",
 				   comp_ctx->cmd_opcode, comp_ctx->status);
 		}
-		/* Check if shifted to polling mode.
-		 * This will happen if there is a completion without an interrupt
-		 * and autopolling mode is enabled. Continuing normal execution in such case
-		 */
-		if (!admin_queue->polling) {
-			admin_queue->running_state = false;
-			ret = -ETIME;
-			goto err;
-		}
+		admin_queue->running_state = false;
+		ret = -ETIME;
+		goto err;
 	}
 
 	ret = ena_com_comp_status_to_errno(admin_queue, comp_ctx->comp_status);
@@ -1650,12 +1641,6 @@ void ena_com_set_admin_polling_mode(struct ena_com_dev *ena_dev, bool polling)
 	ena_dev->admin_queue.polling = polling;
 }
 
-void ena_com_set_admin_auto_polling_mode(struct ena_com_dev *ena_dev,
-					 bool polling)
-{
-	ena_dev->admin_queue.auto_polling = polling;
-}
-
 int ena_com_mmio_reg_read_request_init(struct ena_com_dev *ena_dev)
 {
 	struct ena_com_mmio_read *mmio_read = &ena_dev->mmio_read;

drivers/net/ethernet/amazon/ena/ena_com.h

@@ -224,9 +224,6 @@ struct ena_com_admin_queue {
 	/* Indicate if the admin queue should poll for completion */
 	bool polling;
 
-	/* Define if fallback to polling mode should occur */
-	bool auto_polling;
-
 	u16 curr_cmd_id;
 
 	/* Indicate that the ena was initialized and can
@@ -493,17 +490,6 @@ bool ena_com_get_admin_running_state(struct ena_com_dev *ena_dev);
  */
 void ena_com_set_admin_polling_mode(struct ena_com_dev *ena_dev, bool polling);
 
-/* ena_com_set_admin_auto_polling_mode - Enable autoswitch to polling mode
- * @ena_dev: ENA communication layer struct
- * @polling: Enable/Disable polling mode
- *
- * Set the autopolling mode.
- * If autopolling is on:
- * In case of missing interrupt when data is available switch to polling.
- */
-void ena_com_set_admin_auto_polling_mode(struct ena_com_dev *ena_dev,
-					 bool polling);
-
 /* ena_com_admin_q_comp_intr_handler - admin queue interrupt handler
  * @ena_dev: ENA communication layer struct
  *