From 6bc867d1387f6a857f21630e6bf0b74a32e881a9 Mon Sep 17 00:00:00 2001 From: Vadim Pasternak Date: Sat, 18 May 2019 18:58:29 +0300 Subject: mlxsw: core: Prevent reading unsupported slave address from SFP EEPROM [ Upstream commit f1436c8036fa3632b2ee78841cf5184b7ef0ad87 ] Prevent reading unsupported slave address from SFP EEPROM by testing Diagnostic Monitoring Type byte in EEPROM. Read only page zero of EEPROM, in case this byte is zero. If some SFP transceiver does not support Digital Optical Monitoring (DOM), reading SFP EEPROM slave address 0x51 could return an error. Availability of DOM support is verified by reading from zero page Diagnostic Monitoring Type byte describing how diagnostic monitoring is implemented by transceiver. If bit 6 of this byte is set, it indicates that digital diagnostic monitoring has been implemented. Otherwise it is not and transceiver could fail to reply to transaction for slave address 0x51 [1010001X (A2h)], which is used to access measurements page. Such issue has been observed when reading cable MCP2M00-xxxx, MCP7F00-xxxx, and few others. Fixes: 2ea109039cd3 ("mlxsw: spectrum: Add support for access cable info via ethtool") Fixes: 4400081b631a ("mlxsw: spectrum: Fix EEPROM access in case of SFP/SFP+") Signed-off-by: Vadim Pasternak Acked-by: Jiri Pirko Signed-off-by: Ido Schimmel Signed-off-by: David S. Miller Signed-off-by: Greg Kroah-Hartman --- drivers/net/ethernet/mellanox/mlxsw/core_env.c | 18 ++++++++++++++++-- 1 file changed, 16 insertions(+), 2 deletions(-) (limited to 'drivers/net/ethernet/mellanox') diff --git a/drivers/net/ethernet/mellanox/mlxsw/core_env.c b/drivers/net/ethernet/mellanox/mlxsw/core_env.c index c1c1965d7acc..72539a9a3847 100644 --- a/drivers/net/ethernet/mellanox/mlxsw/core_env.c +++ b/drivers/net/ethernet/mellanox/mlxsw/core_env.c @@ -3,6 +3,7 @@ #include #include +#include #include "core.h" #include "core_env.h" @@ -162,7 +163,7 @@ int mlxsw_env_get_module_info(struct mlxsw_core *mlxsw_core, int module, { u8 module_info[MLXSW_REG_MCIA_EEPROM_MODULE_INFO_SIZE]; u16 offset = MLXSW_REG_MCIA_EEPROM_MODULE_INFO_SIZE; - u8 module_rev_id, module_id; + u8 module_rev_id, module_id, diag_mon; unsigned int read_size; int err; @@ -195,8 +196,21 @@ int mlxsw_env_get_module_info(struct mlxsw_core *mlxsw_core, int module, } break; case MLXSW_REG_MCIA_EEPROM_MODULE_INFO_ID_SFP: + /* Verify if transceiver provides diagnostic monitoring page */ + err = mlxsw_env_query_module_eeprom(mlxsw_core, module, + SFP_DIAGMON, 1, &diag_mon, + &read_size); + if (err) + return err; + + if (read_size < 1) + return -EIO; + modinfo->type = ETH_MODULE_SFF_8472; - modinfo->eeprom_len = ETH_MODULE_SFF_8472_LEN; + if (diag_mon) + modinfo->eeprom_len = ETH_MODULE_SFF_8472_LEN; + else + modinfo->eeprom_len = ETH_MODULE_SFF_8472_LEN / 2; break; default: return -EINVAL; -- cgit v1.2.3