i40e: Retry AQC GetPhyAbilities to overcome I2CRead hangs

- When the I2C is busy, the PHY reads are delayed.  The firmware will
  return EGAIN in these cases with an expectation that the SW will
  trigger the reads again
- This patch retries the operation for a maximum period of 500ms

Signed-off-by: Jayaprakash Shanmugam <jayaprakash.shanmugam@intel.com>
Tested-by: Andrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

diff --git a/drivers/net/ethernet/intel/i40e/i40e_common.c b/drivers/net/ethernet/intel/i40e/i40e_common.c
index 60542beda7adefaf1f22ffbe0c0fd494144c1782..53aad378d49c1d9114da70344e8acbc2fb2462ed 100644 (file)
--- a/drivers/net/ethernet/intel/i40e/i40e_common.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_common.c
@@ -1567,30 +1567,46 @@ i40e_status i40e_aq_get_phy_capabilities(struct i40e_hw *hw,
        struct i40e_aq_desc desc;
        i40e_status status;
        u16 abilities_size = sizeof(struct i40e_aq_get_phy_abilities_resp);
+       u16 max_delay = I40E_MAX_PHY_TIMEOUT, total_delay = 0;
 
        if (!abilities)
                return I40E_ERR_PARAM;
 
-       i40e_fill_default_direct_cmd_desc(&desc,
-                                         i40e_aqc_opc_get_phy_abilities);
+       do {
+               i40e_fill_default_direct_cmd_desc(&desc,
+                                              i40e_aqc_opc_get_phy_abilities);
 
-       desc.flags |= cpu_to_le16((u16)I40E_AQ_FLAG_BUF);
-       if (abilities_size > I40E_AQ_LARGE_BUF)
-               desc.flags |= cpu_to_le16((u16)I40E_AQ_FLAG_LB);
+               desc.flags |= cpu_to_le16((u16)I40E_AQ_FLAG_BUF);
+               if (abilities_size > I40E_AQ_LARGE_BUF)
+                       desc.flags |= cpu_to_le16((u16)I40E_AQ_FLAG_LB);
 
-       if (qualified_modules)
-               desc.params.external.param0 |=
+               if (qualified_modules)
+                       desc.params.external.param0 |=
                        cpu_to_le32(I40E_AQ_PHY_REPORT_QUALIFIED_MODULES);
 
-       if (report_init)
-               desc.params.external.param0 |=
+               if (report_init)
+                       desc.params.external.param0 |=
                        cpu_to_le32(I40E_AQ_PHY_REPORT_INITIAL_VALUES);
 
-       status = i40e_asq_send_command(hw, &desc, abilities, abilities_size,
-                                      cmd_details);
+               status = i40e_asq_send_command(hw, &desc, abilities,
+                                              abilities_size, cmd_details);
 
-       if (hw->aq.asq_last_status == I40E_AQ_RC_EIO)
-               status = I40E_ERR_UNKNOWN_PHY;
+               if (status)
+                       break;
+
+               if (hw->aq.asq_last_status == I40E_AQ_RC_EIO) {
+                       status = I40E_ERR_UNKNOWN_PHY;
+                       break;
+               } else if (hw->aq.asq_last_status == I40E_AQ_RC_EAGAIN) {
+                       usleep_range(1000, 2000);
+                       total_delay++;
+                       status = I40E_ERR_TIMEOUT;
+               }
+       } while ((hw->aq.asq_last_status != I40E_AQ_RC_OK) &&
+                (total_delay < max_delay));
+
+       if (status)
+               return status;
 
        if (report_init) {
                if (hw->mac.type ==  I40E_MAC_XL710 &&

diff --git a/drivers/net/ethernet/intel/i40e/i40e_type.h b/drivers/net/ethernet/intel/i40e/i40e_type.h
index 4b32b1d38a661998ae54fbe5596c63340dfa579a..0410fcbdbb9425c3ecbe83e4848d9af657d83cda 100644 (file)
--- a/drivers/net/ethernet/intel/i40e/i40e_type.h
+++ b/drivers/net/ethernet/intel/i40e/i40e_type.h
@@ -46,6 +46,9 @@
 /* Max default timeout in ms, */
 #define I40E_MAX_NVM_TIMEOUT           18000
 
+/* Max timeout in ms for the phy to respond */
+#define I40E_MAX_PHY_TIMEOUT           500
+
 /* Switch from ms to the 1usec global time (this is the GTIME resolution) */
 #define I40E_MS_TO_GTIME(time)         ((time) * 1000)
 

diff --git a/drivers/net/ethernet/intel/i40evf/i40e_type.h b/drivers/net/ethernet/intel/i40evf/i40e_type.h
index 9364b67fff9c42b9098690e08ce9d2956d12ddd4..213b773dfad632e3f7abec9ee7f5a083b7ed237b 100644 (file)
--- a/drivers/net/ethernet/intel/i40evf/i40e_type.h
+++ b/drivers/net/ethernet/intel/i40evf/i40e_type.h
@@ -46,6 +46,9 @@
 /* Max default timeout in ms, */
 #define I40E_MAX_NVM_TIMEOUT           18000
 
+/* Max timeout in ms for the phy to respond */
+#define I40E_MAX_PHY_TIMEOUT           500
+
 /* Switch from ms to the 1usec global time (this is the GTIME resolution) */
 #define I40E_MS_TO_GTIME(time)         ((time) * 1000)