* [RFC PATCH net-next] net: ethtool: add BaseC2C medium & AUI C2C link modes
@ 2026-09-27 22:36 Siddaraju DH
2026-09-27 22:55 ` Andrew Lunn
0 siblings, 1 reply; 2+ messages in thread
From: Siddaraju DH @ 2026-09-27 22:36 UTC (permalink / raw)
To: netdev, Andrew Lunn, Maxime Chevallier, Michal Kubecek
Cc: Siddaraju DH, Vijay Srinivasan, Balaji Chintalapalle, Shubham Das,
Susheela M Doddagoudar, Sridhar Samudrala, Jacob E Keller,
Anthony L Nguyen, Magnus Lindberg, Niklas Damberg, Jonas Wirandi,
Anjali Singhai, Jesse Brandeburg, David Laight, Eric Joyner,
Jakub Kicinski, David S . Miller, Eric Dumazet, Paolo Abeni
IEEE 802.3 defines a family of chip-to-chip (C2C) Attachment Unit
Interfaces (AUI) and SFF-8418 defines the 10 Gb/s SFI equivalent. These
are electrical interfaces between two ICs on the same board, with a
fully specified lane count, signalling rate and modulation.
Add a new BaseC2C link medium (ETHTOOL_LINK_MEDIUM_BASEC2C) and the
following C2C link modes, that will use the BaseC2C medium:
==========================================================
Link mode Interface #Lane Specification
==========================================================
10Gb/s per lane (NRZ, 10.3125 GBd)
10000baseC2C/Full 10G SFI C2C 1 SFF-8418
25Gb/s per lane (NRZ, 25.78125 GBd)
25000baseC2C/Full 25GAUI C2C 1 IEEE 802.3-2018 Annex 109A
50000baseC2C2/Full LAUI-2 C2C 2 IEEE 802.3-2022 Annex 135B
100000baseC2C4/Full CAUI-4 C2C 4 IEEE 802.3-2018 Annex 83D
50Gb/s per lane (PAM4, 26.5625 GBd)
50000baseC2C/Full 50GAUI-1 C2C 1 IEEE 802.3-2022 Annex 135F
100000baseC2C2/Full 100GAUI-2 C2C 2 IEEE 802.3-2022 Annex 135F
200000baseC2C4/Full 200GAUI-4 C2C 4 IEEE 802.3-2022 Annex 120D
100Gb/s per lane (PAM4, 53.125 GBd)
100000baseC2C/Full 100GAUI-1 C2C 1 IEEE 802.3ck Annex 120F
200000baseC2C2/Full 200GAUI-2 C2C 2 IEEE 802.3ck Annex 120F
400000baseC2C4/Full 400GAUI-4 C2C 4 IEEE 802.3ck Annex 120F
All new modes will use the BaseC2C medium.
Link: https://lore.kernel.org/netdev/SN7PR11MB6900FFD91358B67F27D981A19ACC2@SN7PR11MB6900.namprd11.prod.outlook.com/T/#u
Signed-off-by: Siddaraju DH <siddaraju.dh@intel.com>
---
include/linux/ethtool.h | 1 +
include/uapi/linux/ethtool.h | 11 +++++++++++
net/ethtool/common.c | 24 ++++++++++++++++++++++++
3 files changed, 36 insertions(+)
diff --git a/include/linux/ethtool.h b/include/linux/ethtool.h
index c4c9ce0..4c9dac8 100644
--- a/include/linux/ethtool.h
+++ b/include/linux/ethtool.h
@@ -247,6 +247,7 @@ enum ethtool_link_medium {
ETHTOOL_LINK_MEDIUM_BASEF,
ETHTOOL_LINK_MEDIUM_BASEV,
ETHTOOL_LINK_MEDIUM_BASEMLD,
+ ETHTOOL_LINK_MEDIUM_BASEC2C,
ETHTOOL_LINK_MEDIUM_NONE,
__ETHTOOL_LINK_MEDIUM_LAST,
diff --git a/include/uapi/linux/ethtool.h b/include/uapi/linux/ethtool.h
index 986d70c..8cc956e 100644
--- a/include/uapi/linux/ethtool.h
+++ b/include/uapi/linux/ethtool.h
@@ -2103,6 +2103,17 @@ enum ethtool_link_mode_bit_indices {
ETHTOOL_LINK_MODE_1600000baseKR8_Full_BIT = 122,
ETHTOOL_LINK_MODE_1600000baseDR8_Full_BIT = 123,
ETHTOOL_LINK_MODE_1600000baseDR8_2_Full_BIT = 124,
+ /* Chip-to-chip Attachment Unit Interfaces (AUI C2C) */
+ ETHTOOL_LINK_MODE_10000baseC2C_Full_BIT = 125, /* 10G-SFI-C2C SFF-8418 */
+ ETHTOOL_LINK_MODE_25000baseC2C_Full_BIT = 126,
+ ETHTOOL_LINK_MODE_50000baseC2C2_Full_BIT = 127,
+ ETHTOOL_LINK_MODE_100000baseC2C4_Full_BIT = 128,
+ ETHTOOL_LINK_MODE_50000baseC2C_Full_BIT = 129,
+ ETHTOOL_LINK_MODE_100000baseC2C2_Full_BIT = 130,
+ ETHTOOL_LINK_MODE_200000baseC2C4_Full_BIT = 131,
+ ETHTOOL_LINK_MODE_100000baseC2C_Full_BIT = 132,
+ ETHTOOL_LINK_MODE_200000baseC2C2_Full_BIT = 133,
+ ETHTOOL_LINK_MODE_400000baseC2C4_Full_BIT = 134,
/* must be last entry */
__ETHTOOL_LINK_MODE_MASK_NBITS
diff --git a/net/ethtool/common.c b/net/ethtool/common.c
index b4e766e..96350db 100644
--- a/net/ethtool/common.c
+++ b/net/ethtool/common.c
@@ -242,6 +242,16 @@ const char link_mode_names[][ETH_GSTRING_LEN] = {
__DEFINE_LINK_MODE_NAME(1600000, KR8, Full),
__DEFINE_LINK_MODE_NAME(1600000, DR8, Full),
__DEFINE_LINK_MODE_NAME(1600000, DR8_2, Full),
+ __DEFINE_LINK_MODE_NAME(10000, C2C, Full),
+ __DEFINE_LINK_MODE_NAME(25000, C2C, Full),
+ __DEFINE_LINK_MODE_NAME(50000, C2C2, Full),
+ __DEFINE_LINK_MODE_NAME(100000, C2C4, Full),
+ __DEFINE_LINK_MODE_NAME(50000, C2C, Full),
+ __DEFINE_LINK_MODE_NAME(100000, C2C2, Full),
+ __DEFINE_LINK_MODE_NAME(200000, C2C4, Full),
+ __DEFINE_LINK_MODE_NAME(100000, C2C, Full),
+ __DEFINE_LINK_MODE_NAME(200000, C2C2, Full),
+ __DEFINE_LINK_MODE_NAME(400000, C2C4, Full),
};
static_assert(ARRAY_SIZE(link_mode_names) == __ETHTOOL_LINK_MODE_MASK_NBITS);
@@ -289,6 +299,9 @@ static_assert(ARRAY_SIZE(link_mode_names) == __ETHTOOL_LINK_MODE_MASK_NBITS);
#define __LINK_MODE_LANES_VR8 8
#define __LINK_MODE_LANES_DR8_2 8
#define __LINK_MODE_LANES_T1BRR 1
+#define __LINK_MODE_LANES_C2C 1
+#define __LINK_MODE_LANES_C2C2 2
+#define __LINK_MODE_LANES_C2C4 4
#define __DEFINE_LINK_MODE_PARAMS_PAIRS(_speed, _type, _min_pairs, _pairs, _duplex, _medium) \
[ETHTOOL_LINK_MODE(_speed, _type, _duplex)] = { \
@@ -469,6 +482,16 @@ const struct link_mode_info link_mode_params[] = {
__DEFINE_LINK_MODE_PARAMS(1600000, KR8, Full, K),
__DEFINE_LINK_MODE_PARAMS(1600000, DR8, Full, D),
__DEFINE_LINK_MODE_PARAMS(1600000, DR8_2, Full, D),
+ __DEFINE_LINK_MODE_PARAMS(10000, C2C, Full, C2C),
+ __DEFINE_LINK_MODE_PARAMS(25000, C2C, Full, C2C),
+ __DEFINE_LINK_MODE_PARAMS(50000, C2C2, Full, C2C),
+ __DEFINE_LINK_MODE_PARAMS(100000, C2C4, Full, C2C),
+ __DEFINE_LINK_MODE_PARAMS(50000, C2C, Full, C2C),
+ __DEFINE_LINK_MODE_PARAMS(100000, C2C2, Full, C2C),
+ __DEFINE_LINK_MODE_PARAMS(200000, C2C4, Full, C2C),
+ __DEFINE_LINK_MODE_PARAMS(100000, C2C, Full, C2C),
+ __DEFINE_LINK_MODE_PARAMS(200000, C2C2, Full, C2C),
+ __DEFINE_LINK_MODE_PARAMS(400000, C2C4, Full, C2C),
};
static_assert(ARRAY_SIZE(link_mode_params) == __ETHTOOL_LINK_MODE_MASK_NBITS);
EXPORT_SYMBOL_GPL(link_mode_params);
@@ -484,6 +507,7 @@ static const char ethtool_link_medium_names[][ETH_GSTRING_LEN] = {
[ETHTOOL_LINK_MEDIUM_BASEF] = "BaseF",
[ETHTOOL_LINK_MEDIUM_BASEV] = "BaseV",
[ETHTOOL_LINK_MEDIUM_BASEMLD] = "BaseMLD",
+ [ETHTOOL_LINK_MEDIUM_BASEC2C] = "BaseC2C",
[ETHTOOL_LINK_MEDIUM_NONE] = "None",
};
static_assert(ARRAY_SIZE(ethtool_link_medium_names) == __ETHTOOL_LINK_MEDIUM_LAST);
--
2.25.1
^ permalink raw reply related [flat|nested] 2+ messages in thread* Re: [RFC PATCH net-next] net: ethtool: add BaseC2C medium & AUI C2C link modes
2026-09-27 22:36 [RFC PATCH net-next] net: ethtool: add BaseC2C medium & AUI C2C link modes Siddaraju DH
@ 2026-09-27 22:55 ` Andrew Lunn
0 siblings, 0 replies; 2+ messages in thread
From: Andrew Lunn @ 2026-09-27 22:55 UTC (permalink / raw)
To: Siddaraju DH
Cc: netdev, Maxime Chevallier, Michal Kubecek, Vijay Srinivasan,
Balaji Chintalapalle, Shubham Das, Susheela M Doddagoudar,
Sridhar Samudrala, Jacob E Keller, Anthony L Nguyen,
Magnus Lindberg, Niklas Damberg, Jonas Wirandi, Anjali Singhai,
Jesse Brandeburg, David Laight, Eric Joyner, Jakub Kicinski,
David S . Miller, Eric Dumazet, Paolo Abeni
On Mon, Sep 28, 2026 at 04:06:56AM +0530, Siddaraju DH wrote:
> IEEE 802.3 defines a family of chip-to-chip (C2C) Attachment Unit
> Interfaces (AUI) and SFF-8418 defines the 10 Gb/s SFI equivalent. These
> are electrical interfaces between two ICs on the same board, with a
> fully specified lane count, signalling rate and modulation.
You should always include a users of new APIs.
> include/uapi/linux/ethtool.h | 11 +++++++++++
This is especially true for UAPIs. It can be hard to fix them once
they get merged.
Please submit this as a patch in a patchset containing its user.
Andrew
---
pw-bot: cr
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2026-09-27 22:36 [RFC PATCH net-next] net: ethtool: add BaseC2C medium & AUI C2C link modes Siddaraju DH
2026-09-27 22:55 ` Andrew Lunn
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