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97 lines
3.8 KiB
Diff
97 lines
3.8 KiB
Diff
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From 05ad5d4581c3c1cc724fe50d4652833fb9f3037b Mon Sep 17 00:00:00 2001
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From: Sean Anderson <sean.anderson@seco.com>
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Date: Fri, 2 Sep 2022 18:02:39 -0400
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Subject: [PATCH] net: phy: Add 1000BASE-KX interface mode
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Add 1000BASE-KX interface mode. This 1G backplane ethernet as described in
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clause 70. Clause 73 autonegotiation is mandatory, and only full duplex
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operation is supported.
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Although at the PMA level this interface mode is identical to
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1000BASE-X, it uses a different form of in-band autonegation. This
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justifies a separate interface mode, since the interface mode (along
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with the MLO_AN_* autonegotiation mode) sets the type of autonegotiation
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which will be used on a link. This results in more than just electrical
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differences between the link modes.
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With regard to 1000BASE-X, 1000BASE-KX holds a similar position to
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SGMII: same signaling, but different autonegotiation. PCS drivers
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(which typically handle in-band autonegotiation) may only support
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1000BASE-X, and not 1000BASE-KX. Similarly, the phy mode is used to
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configure serdes phys with phy_set_mode_ext. Due to the different
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electrical standards (SFI or XFI vs Clause 70), they will likely want to
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use different configuration. Adding a phy interface mode for
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1000BASE-KX helps simplify configuration in these areas.
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Signed-off-by: Sean Anderson <sean.anderson@seco.com>
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Signed-off-by: David S. Miller <davem@davemloft.net>
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---
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Documentation/networking/phy.rst | 6 ++++++
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drivers/net/phy/phy-core.c | 1 +
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drivers/net/phy/phylink.c | 1 +
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include/linux/phy.h | 4 ++++
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4 files changed, 12 insertions(+)
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--- a/Documentation/networking/phy.rst
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+++ b/Documentation/networking/phy.rst
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@@ -312,6 +312,12 @@ Some of the interface modes are describe
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PTP-enabled PHYs. This mode isn't compatible with QSGMII, but offers the
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same capabilities in terms of link speed and negociation.
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+``PHY_INTERFACE_MODE_1000BASEKX``
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+ This is 1000BASE-X as defined by IEEE 802.3 Clause 36 with Clause 73
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+ autonegotiation. Generally, it will be used with a Clause 70 PMD. To
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+ contrast with the 1000BASE-X phy mode used for Clause 38 and 39 PMDs, this
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+ interface mode has different autonegotiation and only supports full duplex.
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+
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Pause frames / flow control
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===========================
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--- a/drivers/net/phy/phy-core.c
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+++ b/drivers/net/phy/phy-core.c
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@@ -114,6 +114,7 @@ int phy_interface_num_ports(phy_interfac
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case PHY_INTERFACE_MODE_100BASEX:
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case PHY_INTERFACE_MODE_RXAUI:
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case PHY_INTERFACE_MODE_XAUI:
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+ case PHY_INTERFACE_MODE_1000BASEKX:
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return 1;
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case PHY_INTERFACE_MODE_QSGMII:
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case PHY_INTERFACE_MODE_QUSGMII:
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--- a/drivers/net/phy/phylink.c
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+++ b/drivers/net/phy/phylink.c
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@@ -390,6 +390,7 @@ void phylink_get_linkmodes(unsigned long
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case PHY_INTERFACE_MODE_1000BASEX:
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caps |= MAC_1000HD;
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fallthrough;
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+ case PHY_INTERFACE_MODE_1000BASEKX:
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case PHY_INTERFACE_MODE_TRGMII:
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caps |= MAC_1000FD;
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break;
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--- a/include/linux/phy.h
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+++ b/include/linux/phy.h
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@@ -116,6 +116,7 @@ extern const int phy_10gbit_features_arr
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* @PHY_INTERFACE_MODE_USXGMII: Universal Serial 10GE MII
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* @PHY_INTERFACE_MODE_10GKR: 10GBASE-KR - with Clause 73 AN
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* @PHY_INTERFACE_MODE_QUSGMII: Quad Universal SGMII
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+ * @PHY_INTERFACE_MODE_1000BASEKX: 1000Base-KX - with Clause 73 AN
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* @PHY_INTERFACE_MODE_MAX: Book keeping
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*
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* Describes the interface between the MAC and PHY.
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@@ -154,6 +155,7 @@ typedef enum {
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/* 10GBASE-KR - with Clause 73 AN */
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PHY_INTERFACE_MODE_10GKR,
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PHY_INTERFACE_MODE_QUSGMII,
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+ PHY_INTERFACE_MODE_1000BASEKX,
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PHY_INTERFACE_MODE_MAX,
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} phy_interface_t;
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@@ -251,6 +253,8 @@ static inline const char *phy_modes(phy_
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return "trgmii";
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case PHY_INTERFACE_MODE_1000BASEX:
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return "1000base-x";
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+ case PHY_INTERFACE_MODE_1000BASEKX:
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+ return "1000base-kx";
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case PHY_INTERFACE_MODE_2500BASEX:
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return "2500base-x";
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case PHY_INTERFACE_MODE_5GBASER:
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