[PATCH net-next] ethtool: link 10000baseCR to SFF-8431, Appendix-E SFP+ DA
From: Siddaraju DH <hidden>
Date: 2026-07-02 14:53:38
Subsystem:
networking [ethtool], networking [general], the rest · Maintainers:
Andrew Lunn, Jakub Kicinski, "David S. Miller", Eric Dumazet, Paolo Abeni, Linus Torvalds
Add comment to clarify the physical media 10000baseCR follows. 10000baseCR does not correspond to any IEEE 802.3 *base-CR PMD. It has no autonegotiation, no link training, and no mandatory FEC. The industry standard for this media type is SFF-8431 Appendix-E Direct Attach cable, also known as 10G_SFI_DA. This change follows the conversation from netdev mail thread with subject: "the confusing 10000base_CR. Shouldn't it be 10000_SFI_DA?" Signed-off-by: Siddaraju DH <redacted> --- 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 a2091d4e00f3..986d70caec33 100644
--- a/include/uapi/linux/ethtool.h
+++ b/include/uapi/linux/ethtool.h@@ -2013,7 +2013,13 @@ enum ethtool_link_mode_bit_indices { ETHTOOL_LINK_MODE_100000baseLR4_ER4_Full_BIT = 39, ETHTOOL_LINK_MODE_50000baseSR2_Full_BIT = 40, ETHTOOL_LINK_MODE_1000baseX_Full_BIT = 41, + + /* Despite the "baseCR" in 10000baseCR, this is not an IEEE 802.3 baseCR + * It represents SFF-8431 Appendix-E SFP+ Direct Attach (10G-SFI-DA). + * The name is kept as-is for uAPI backward compatibility. + */ ETHTOOL_LINK_MODE_10000baseCR_Full_BIT = 42, + ETHTOOL_LINK_MODE_10000baseSR_Full_BIT = 43, ETHTOOL_LINK_MODE_10000baseLR_Full_BIT = 44, ETHTOOL_LINK_MODE_10000baseLRM_Full_BIT = 45,
--
2.25.1