[dpdk-dev] [PATCH v3 13/30] net/ena/base: use 48-bit memory addresses in ena_com

[Michal Krawczyk]

ENA device is using 48-bit memory for IO. because of that, the upper
limit had to be updated.

>From the driver perspective, it's just a cosmetic change to make
definition of the strucutre 'ena_common_mem_addr' more descriptive and
the address value was verified anyway for the valid range in the
function 'ena_com_mem_addr_set()'.

Signed-off-by: Michal Krawczyk <mk at semihalf.com>
Reviewed-by: Igor Chauskin <igorch at amazon.com>
Reviewed-by: Guy Tzalik <gtzalik at amazon.com>
---
v3:
  * Explain impact of this change in the commit log
  * Update copyright date of the modified file

 drivers/net/ena/base/ena_com.c                  | 2 +-
 drivers/net/ena/base/ena_defs/ena_common_defs.h | 8 ++++++--
 2 files changed, 7 insertions(+), 3 deletions(-)

diff --git a/drivers/net/ena/base/ena_com.c b/drivers/net/ena/base/ena_com.c
index f128d3c4f3..4968054a99 100644
--- a/drivers/net/ena/base/ena_com.c
+++ b/drivers/net/ena/base/ena_com.c
@@ -73,7 +73,7 @@ static int ena_com_mem_addr_set(struct ena_com_dev *ena_dev,
 	}
 
 	ena_addr->mem_addr_low = lower_32_bits(addr);
-	ena_addr->mem_addr_high = upper_32_bits(addr);
+	ena_addr->mem_addr_high = (u16)upper_32_bits(addr);
 
 	return 0;
 }
diff --git a/drivers/net/ena/base/ena_defs/ena_common_defs.h b/drivers/net/ena/base/ena_defs/ena_common_defs.h
index 1818c29a87..d1ee40de32 100644
--- a/drivers/net/ena/base/ena_defs/ena_common_defs.h
+++ b/drivers/net/ena/base/ena_defs/ena_common_defs.h
@@ -1,5 +1,5 @@
 /* SPDX-License-Identifier: BSD-3-Clause
- * Copyright (c) 2015-2019 Amazon.com, Inc. or its affiliates.
+ * Copyright (c) 2015-2020 Amazon.com, Inc. or its affiliates.
  * All rights reserved.
  */
 
@@ -9,10 +9,14 @@
 #define ENA_COMMON_SPEC_VERSION_MAJOR        2
 #define ENA_COMMON_SPEC_VERSION_MINOR        0
 
+/* ENA operates with 48-bit memory addresses. ena_mem_addr_t */
 struct ena_common_mem_addr {
 	uint32_t mem_addr_low;
 
-	uint32_t mem_addr_high;
+	uint16_t mem_addr_high;
+
+	/* MBZ */
+	uint16_t reserved16;
 };
 
 #endif /* _ENA_COMMON_H_ */
-- 
2.20.1