netdev - [Intel-wired-lan] [PATCH v2 0/1] ixgbe: Correct BASE-BX10 compliance code

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Message-ID: <20241114195047.533083-1-tore@amundsen.org>
Date: Thu, 14 Nov 2024 19:50:46 +0000
From: Tore Amundsen <tore@...ndsen.org>
To: pmenzel@...gen.mpg.de
Cc: andrew+netdev@...n.ch,
	anthony.l.nguyen@...el.com,
	davem@...emloft.net,
	edumazet@...gle.com,
	ernesto@...tellotti.net,
	intel-wired-lan@...ts.osuosl.org,
	kuba@...nel.org,
	linux-kernel@...r.kernel.org,
	netdev@...r.kernel.org,
	pabeni@...hat.com,
	przemyslaw.kitszel@...el.com,
	tore@...ndsen.org
Subject: [Intel-wired-lan] [PATCH v2 0/1] ixgbe: Correct BASE-BX10 compliance code

The current code in ixgbe_82599 checks the SFP Ethernet compliance code
against IXGBE_SFF_BASEBX10_CAPABLE to determine if an SFP module supports
1GB BASE-BX. According to SFF-8472 (section 5.4 Transceiver Compliance
Codes), the BASE-BX10 bit is defined as bit 6, which corresponds to a
value of 0x40 (binary 01000000).

However, the current value of IXGBE_SFF_BASEBX10_CAPABLE is 0x64 (binary
01100100), which incorrectly sets bits for 1000BASE-CX (bit 2) and
100BASE-FX (bit 5) in addition to BASE-BX10 (bit 6). This mix-up causes
the driver to incorrectly configure for BASE-BX when encountering
1000BASE-CX modules. Although 100BASE-FX does not pass the nominal
signaling rate check, this error could lead to future bugs if other
codes start to depend on the incorrect value of
IXGBE_SFF_BASEBX10_CAPABLE.

This patch corrects the value of IXGBE_SFF_BASEBX10_CAPABLE to 0x40.

Changelog for v2:
- Added Fixes tag as requested by Paul Menzel.

Tore Amundsen (1):
  ixgbe: Correct BASE-BX10 compliance code

 drivers/net/ethernet/intel/ixgbe/ixgbe_phy.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

-- 
2.43.0