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

Message ID 20241114195047.533083-1-tore@amundsen.org (mailing list archive)
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Series ixgbe: Correct BASE-BX10 compliance code | expand

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Tore Amundsen Nov. 14, 2024, 7:50 p.m. UTC 
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(-)