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Date: Mon, 29 Jul 2013 05:52:03 -0700
From: Jeff Kirsher <jeffrey.t.kirsher@...el.com>
To: davem@...emloft.net
Cc: Emil Tantilov <emil.s.tantilov@...el.com>, netdev@...r.kernel.org,
gospo@...hat.com, sassmann@...hat.com,
Jeff Kirsher <jeffrey.t.kirsher@...el.com>
Subject: [net-next 07/15] ixgbe: fix SFF data dumps of SFP+ modules
From: Emil Tantilov <emil.s.tantilov@...el.com>
This patch fixes several issues with the previous implementation of the
SFF data dump of SFP+ modules:
- removed the __IXGBE_READ_I2C flag - I2C access locking is handled in the
HW specific routines
- fixed the read loop to read data from ee->offset to ee->len
- the reads fail if __IXGBE_IN_SFP_INIT is set in the process - this is
needed because on some HW I2C operations can take long time and disrupt
the SFP and link detection process
Signed-off-by: Emil Tantilov <emil.s.tantilov@...el.com>
Reported-by: Ben Hutchings <bhutchings@...arflare.com>
Tested-by: Phil Schmitt <phillip.j.schmitt@...el.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@...el.com>
---
drivers/net/ethernet/intel/ixgbe/ixgbe.h | 1 -
drivers/net/ethernet/intel/ixgbe/ixgbe_ethtool.c | 73 ++++++------------------
drivers/net/ethernet/intel/ixgbe/ixgbe_main.c | 4 --
3 files changed, 18 insertions(+), 60 deletions(-)
diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe.h b/drivers/net/ethernet/intel/ixgbe/ixgbe.h
index 7be725c..d882278 100644
--- a/drivers/net/ethernet/intel/ixgbe/ixgbe.h
+++ b/drivers/net/ethernet/intel/ixgbe/ixgbe.h
@@ -754,7 +754,6 @@ enum ixgbe_state_t {
__IXGBE_DOWN,
__IXGBE_SERVICE_SCHED,
__IXGBE_IN_SFP_INIT,
- __IXGBE_READ_I2C,
};
struct ixgbe_cb {
diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_ethtool.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_ethtool.c
index ae58a92..da1ea28 100644
--- a/drivers/net/ethernet/intel/ixgbe/ixgbe_ethtool.c
+++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_ethtool.c
@@ -2910,33 +2910,21 @@ static int ixgbe_get_module_info(struct net_device *dev,
struct ixgbe_hw *hw = &adapter->hw;
u32 status;
u8 sff8472_rev, addr_mode;
- int ret_val = 0;
bool page_swap = false;
- /* avoid concurent i2c reads */
- while (test_bit(__IXGBE_IN_SFP_INIT, &adapter->state))
- msleep(100);
-
- /* used by the service task */
- set_bit(__IXGBE_READ_I2C, &adapter->state);
-
/* Check whether we support SFF-8472 or not */
status = hw->phy.ops.read_i2c_eeprom(hw,
IXGBE_SFF_SFF_8472_COMP,
&sff8472_rev);
- if (status != 0) {
- ret_val = -EIO;
- goto err_out;
- }
+ if (status != 0)
+ return -EIO;
/* addressing mode is not supported */
status = hw->phy.ops.read_i2c_eeprom(hw,
IXGBE_SFF_SFF_8472_SWAP,
&addr_mode);
- if (status != 0) {
- ret_val = -EIO;
- goto err_out;
- }
+ if (status != 0)
+ return -EIO;
if (addr_mode & IXGBE_SFF_ADDRESSING_MODE) {
e_err(drv, "Address change required to access page 0xA2, but not supported. Please report the module type to the driver maintainers.\n");
@@ -2953,9 +2941,7 @@ static int ixgbe_get_module_info(struct net_device *dev,
modinfo->eeprom_len = ETH_MODULE_SFF_8472_LEN;
}
-err_out:
- clear_bit(__IXGBE_READ_I2C, &adapter->state);
- return ret_val;
+ return 0;
}
static int ixgbe_get_module_eeprom(struct net_device *dev,
@@ -2969,48 +2955,25 @@ static int ixgbe_get_module_eeprom(struct net_device *dev,
int i = 0;
int ret_val = 0;
- /* ixgbe_get_module_info is called before this function in all
- * cases, so we do not need any checks we already do above,
- * and can trust ee->len to be a known value.
- */
+ if (ee->len == 0)
+ return -EINVAL;
- while (test_bit(__IXGBE_IN_SFP_INIT, &adapter->state))
- msleep(100);
- set_bit(__IXGBE_READ_I2C, &adapter->state);
+ for (i = ee->offset; i < ee->len; i++) {
+ /* I2C reads can take long time */
+ if (test_bit(__IXGBE_IN_SFP_INIT, &adapter->state))
+ return -EBUSY;
- /* Read the first block, SFF-8079 */
- for (i = 0; i < ETH_MODULE_SFF_8079_LEN; i++) {
- status = hw->phy.ops.read_i2c_eeprom(hw, i, &databyte);
- if (status != 0) {
- /* Error occured while reading module */
+ if (i < ETH_MODULE_SFF_8079_LEN)
+ status = hw->phy.ops.read_i2c_eeprom(hw, i, &databyte);
+ else
+ status = hw->phy.ops.read_i2c_sff8472(hw, i, &databyte);
+
+ if (status != 0)
ret_val = -EIO;
- goto err_out;
- }
- data[i] = databyte;
- }
- /* If the second block is requested, check if SFF-8472 is supported. */
- if (ee->len == ETH_MODULE_SFF_8472_LEN) {
- if (data[IXGBE_SFF_SFF_8472_COMP] == IXGBE_SFF_SFF_8472_UNSUP)
- return -EOPNOTSUPP;
-
- /* Read the second block, SFF-8472 */
- for (i = ETH_MODULE_SFF_8079_LEN;
- i < ETH_MODULE_SFF_8472_LEN; i++) {
- status = hw->phy.ops.read_i2c_sff8472(hw,
- i - ETH_MODULE_SFF_8079_LEN, &databyte);
- if (status != 0) {
- /* Error occured while reading module */
- ret_val = -EIO;
- goto err_out;
- }
- data[i] = databyte;
- }
+ data[i - ee->offset] = databyte;
}
-err_out:
- clear_bit(__IXGBE_READ_I2C, &adapter->state);
-
return ret_val;
}
diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
index 6a2b7a0..3aff87e 100644
--- a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
+++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
@@ -5833,10 +5833,6 @@ static void ixgbe_sfp_detection_subtask(struct ixgbe_adapter *adapter)
!(adapter->flags2 & IXGBE_FLAG2_SFP_NEEDS_RESET))
return;
- /* concurent i2c reads are not supported */
- if (test_bit(__IXGBE_READ_I2C, &adapter->state))
- return;
-
/* someone else is in init, wait until next service event */
if (test_and_set_bit(__IXGBE_IN_SFP_INIT, &adapter->state))
return;
--
1.7.11.7
--
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