From: Arthur Kiyanovski <akiyano@amazon.com>
Date: Mon, 16 Sep 2019 14:31:29 +0300
Subject: [PATCH] net: ena: enable the interrupt_moderation in
 driver_supported_features
Origin: https://git.kernel.org/linus/bd21b0cc3a63d1c658b230db084b0f392b78cab2
Bug-Debian: https://bugs.debian.org/941291

Add driver_supported_features to host_host info which is a new API used to
communicate to the device which features are supported by the driver.

Add the interrupt_moderation bit to host_info->driver_supported_features
and enable it to signal the device that this driver supports interrupt
moderation properly.

Reserved bits are for features implemented in the future

Signed-off-by: Arthur Kiyanovski <akiyano@amazon.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---
 drivers/net/ethernet/amazon/ena/ena_admin_defs.h | 8 ++++++++
 drivers/net/ethernet/amazon/ena/ena_netdev.c     | 3 +++
 2 files changed, 11 insertions(+)

Index: linux/drivers/net/ethernet/amazon/ena/ena_admin_defs.h
===================================================================
--- linux.orig/drivers/net/ethernet/amazon/ena/ena_admin_defs.h
+++ linux/drivers/net/ethernet/amazon/ena/ena_admin_defs.h
@@ -808,6 +808,12 @@ struct ena_admin_host_info {
 	u16 num_cpus;
 
 	u16 reserved;
+
+	/* 1 :0 : reserved
+	 * 2 : interrupt_moderation
+	 * 31:3 : reserved
+	 */
+	u32 driver_supported_features;
 };
 
 struct ena_admin_rss_ind_table_entry {
@@ -1110,6 +1116,8 @@ struct ena_admin_ena_mmio_req_read_less_
 #define ENA_ADMIN_HOST_INFO_DEVICE_MASK                     GENMASK(7, 3)
 #define ENA_ADMIN_HOST_INFO_BUS_SHIFT                       8
 #define ENA_ADMIN_HOST_INFO_BUS_MASK                        GENMASK(15, 8)
+#define ENA_ADMIN_HOST_INFO_INTERRUPT_MODERATION_SHIFT      2
+#define ENA_ADMIN_HOST_INFO_INTERRUPT_MODERATION_MASK       BIT(2)
 
 /* aenq_common_desc */
 #define ENA_ADMIN_AENQ_COMMON_DESC_PHASE_MASK               BIT(0)
Index: linux/drivers/net/ethernet/amazon/ena/ena_netdev.c
===================================================================
--- linux.orig/drivers/net/ethernet/amazon/ena/ena_netdev.c
+++ linux/drivers/net/ethernet/amazon/ena/ena_netdev.c
@@ -2440,6 +2440,9 @@ static void ena_config_host_info(struct
 		("K"[0] << ENA_ADMIN_HOST_INFO_MODULE_TYPE_SHIFT);
 	host_info->num_cpus = num_online_cpus();
 
+	host_info->driver_supported_features =
+		ENA_ADMIN_HOST_INFO_INTERRUPT_MODERATION_MASK;
+
 	rc = ena_com_set_host_attributes(ena_dev);
 	if (rc) {
 		if (rc == -EOPNOTSUPP)
