From: Jakub Staniszewski jakub.staniszewski@linux.intel.com

Executing ethtool -m can fail reporting a netlink I/O error while firmware link management holds the i2c bus used to communicate with the module.

According to Intel(R) Ethernet Controller E810 Datasheet Rev 2.8 [1] Section 3.3.10.4 Read/Write SFF EEPROM (0x06EE) request should to be retried upon receiving EBUSY from firmware.

Commit e9c9692c8a81 ("ice: Reimplement module reads used by ethtool") implemented it only for part of ice_get_module_eeprom(), leaving all other calls to ice_aq_sff_eeprom() vulnerable to returning early on getting EBUSY without retrying.

Remove the retry loop from ice_get_module_eeprom() and add Admin Queue (AQ) command with opcode 0x06EE to the list of commands that should be retried on receiving EBUSY from firmware.

Cc: stable@vger.kernel.org Fixes: e9c9692c8a81 ("ice: Reimplement module reads used by ethtool") Signed-off-by: Jakub Staniszewski jakub.staniszewski@linux.intel.com Co-developed-by: Dawid Osuchowski dawid.osuchowski@linux.intel.com Signed-off-by: Dawid Osuchowski dawid.osuchowski@linux.intel.com Reviewed-by: Aleksandr Loktionov aleksandr.loktionov@intel.com Reviewed-by: Przemek Kitszel przemyslaw.kitszel@intel.com Link: https://www.intel.com/content/www/us/en/content-details/613875/intel-etherne... [1] --- drivers/net/ethernet/intel/ice/ice_common.c | 1 + drivers/net/ethernet/intel/ice/ice_ethtool.c | 35 ++++++++------------ 2 files changed, 15 insertions(+), 21 deletions(-)

diff --git a/drivers/net/ethernet/intel/ice/ice_common.c b/drivers/net/ethernet/intel/ice/ice_common.c index aab00c44e9b2..26eb8e05498b 100644 --- a/drivers/net/ethernet/intel/ice/ice_common.c +++ b/drivers/net/ethernet/intel/ice/ice_common.c @@ -1854,6 +1854,7 @@ static bool ice_should_retry_sq_send_cmd(u16 opcode) case ice_aqc_opc_lldp_stop: case ice_aqc_opc_lldp_start: case ice_aqc_opc_lldp_filter_ctrl: + case ice_aqc_opc_sff_eeprom: return true; }

diff --git a/drivers/net/ethernet/intel/ice/ice_ethtool.c b/drivers/net/ethernet/intel/ice/ice_ethtool.c index 3565a5d96c6d..478876908db1 100644 --- a/drivers/net/ethernet/intel/ice/ice_ethtool.c +++ b/drivers/net/ethernet/intel/ice/ice_ethtool.c @@ -4496,7 +4496,7 @@ ice_get_module_eeprom(struct net_device *netdev, u8 addr = ICE_I2C_EEPROM_DEV_ADDR; struct ice_hw *hw = &pf->hw; bool is_sfp = false; - unsigned int i, j; + unsigned int i; u16 offset = 0; u8 page = 0; int status; @@ -4538,26 +4538,19 @@ ice_get_module_eeprom(struct net_device *netdev, if (page == 0 || !(data[0x2] & 0x4)) { u32 copy_len;

- /* If i2c bus is busy due to slow page change or - * link management access, call can fail. This is normal. - * So we retry this a few times. - */ - for (j = 0; j < 4; j++) { - status = ice_aq_sff_eeprom(hw, 0, addr, offset, page, - !is_sfp, value, - SFF_READ_BLOCK_SIZE, - 0, NULL); - netdev_dbg(netdev, "SFF %02X %02X %02X %X = %02X%02X%02X%02X.%02X%02X%02X%02X (%X)\n", - addr, offset, page, is_sfp, - value[0], value[1], value[2], value[3], - value[4], value[5], value[6], value[7], - status); - if (status) { - usleep_range(1500, 2500); - memset(value, 0, SFF_READ_BLOCK_SIZE); - continue; - } - break; + status = ice_aq_sff_eeprom(hw, 0, addr, offset, page, + !is_sfp, value, + SFF_READ_BLOCK_SIZE, + 0, NULL); + netdev_dbg(netdev, "SFF %02X %02X %02X %X = %02X%02X%02X%02X.%02X%02X%02X%02X (%pe)\n", + addr, offset, page, is_sfp, + value[0], value[1], value[2], value[3], + value[4], value[5], value[6], value[7], + ERR_PTR(status)); + if (status) { + netdev_err(netdev, "%s: error reading module EEPROM: status %pe\n", + __func__, ERR_PTR(status)); + return status; }

/* Make sure we have enough room for the new block */