From: Vidya Sagar Ravipati <vi...@cumulusnetworks.com>
This patch provides macro definitions for maximum possible
memory map size of QSFP+/QSFP28 EEPROMs as per SFF-8436/SFF-8636
According to SFF-8436/SFF-8636 specs, the common memory map for
managing external cable interfaces is arranged into a single
lower page address space of 128 bytes and multiple upper address pages
of 128 bytes each. The total size of memory map is up to 5 128 byte pages
defined by a "pages valid" register and switched via a "page select"
register for "optional pages". Memory of 256 bytes can be memory mapped
at a time and QSFP+/QSFP28 drivers can export upto 5*128 bytes of
eeprom dump.
QSFP+/QSFP28 Memory layout
2-Wire Serial Address: 1010000x
Lower Page 00h (128 bytes)
======================
|Page Select Byte(127)|
======================
|
V
----------------------------------------
| | | |
V V V V
---------- ---------- --------- ------------
| Upper | | Upper | | Upper | | Upper |
| Page 00h | | Page 01h | | Page 02h | | Page 03h |
| | |(Optional)| |(Optional)| | (Optional) |
| ID | | AST | | User | | For |
| Fields | | Table | | EEPROM | | Cable |
----------- ----------- ---------- --------------
Signed-off-by: Vidya Sagar Ravipati <vi...@cumulusnetworks.com>
---
include/uapi/linux/ethtool.h | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/include/uapi/linux/ethtool.h b/include/uapi/linux/ethtool.h
index 5f030b4..ff6ccbd 100644
--- a/include/uapi/linux/ethtool.h
+++ b/include/uapi/linux/ethtool.h
@@ -1584,9 +1584,15 @@ static inline int ethtool_validate_duplex(__u8 duplex)
#define ETH_MODULE_SFF_8472 0x2
#define ETH_MODULE_SFF_8472_LEN 512
#define ETH_MODULE_SFF_8636 0x3
+/* min, without optional page */
#define ETH_MODULE_SFF_8636_LEN 256
+/* max, with all optional pages */
+#define ETH_MODULE_SFF_8636_MAX_LEN 640
#define ETH_MODULE_SFF_8436 0x4
+/* min, without optional page */
#define ETH_MODULE_SFF_8436_LEN 256
+/* max, with all optional pages */
+#define ETH_MODULE_SFF_8436_MAX_LEN 640
/* Reset flags */
/* The reset() operation must clear the flags for the components which
--
2.1.4
