i40e/i40evf: add max buf len to aq debug print helper

There is at least one case in the Firmware API where the response to a
command changes the buffer size field in the AQ descriptor to a larger
number than what the request's buffer size started as.  This is in addition
to setting an error flag and is in order to tell the requester how much
larger a buffer is required for the answer.  We need to be sure not to
use that number when dumping the contents of the data buffer because it
can send us into the weeds and generate an invalid pointer exception.

This patch adds a max buffer size parameter to the print helper to be
sure the code knows when to stop.

Change-ID: Ib84f7ed72140fe9d600086d8f2002fc5d8753092
Signed-off-by: Shannon Nelson <shannon.nelson@intel.com>
Tested-by: Jim Young <jamesx.m.young@intel.com>
Tested-by: Sibai Li <sibai.li@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

1 files changed, 6 insertions, 3 deletions

diff --git a/drivers/net/ethernet/intel/i40evf/i40e_adminq.c b/drivers/net/ethernet/intel/i40evf/i40e_adminq.c
index 003006033614..f206be917842 100644
--- a/drivers/net/ethernet/intel/i40evf/i40e_adminq.c
+++ b/drivers/net/ethernet/intel/i40evf/i40e_adminq.c
@@ -788,7 +788,8 @@ i40e_status i40evf_asq_send_command(struct i40e_hw *hw,
 
         /* bump the tail */
         i40e_debug(hw, I40E_DEBUG_AQ_MESSAGE, "AQTX: desc and buffer:\n");
-        i40evf_debug_aq(hw, I40E_DEBUG_AQ_COMMAND, (void *)desc_on_ring, buff);
+        i40evf_debug_aq(hw, I40E_DEBUG_AQ_COMMAND, (void *)desc_on_ring,
+                        buff, buff_size);
         (hw->aq.asq.next_to_use)++;
         if (hw->aq.asq.next_to_use == hw->aq.asq.count)
                 hw->aq.asq.next_to_use = 0;
@@ -842,7 +843,8 @@ i40e_status i40evf_asq_send_command(struct i40e_hw *hw,
 
         i40e_debug(hw, I40E_DEBUG_AQ_MESSAGE,
                    "AQTX: desc and buffer writeback:\n");
-        i40evf_debug_aq(hw, I40E_DEBUG_AQ_COMMAND, (void *)desc, buff);
+        i40evf_debug_aq(hw, I40E_DEBUG_AQ_COMMAND, (void *)desc, buff,
+                        buff_size);
 
         /* update the error if time out occurred */
         if ((!cmd_completed) &&
@@ -938,7 +940,8 @@ i40e_status i40evf_clean_arq_element(struct i40e_hw *hw,
                 hw->aq.nvm_busy = false;
 
         i40e_debug(hw, I40E_DEBUG_AQ_MESSAGE, "AQRX: desc and buffer:\n");
-        i40evf_debug_aq(hw, I40E_DEBUG_AQ_COMMAND, (void *)desc, e->msg_buf);
+        i40evf_debug_aq(hw, I40E_DEBUG_AQ_COMMAND, (void *)desc, e->msg_buf,
+                        hw->aq.arq_buf_size);
 
         /* Restore the original datalen and buffer address in the desc,
          * FW updates datalen to indicate the event message