ice: reintroduce retry mechanism for indirect AQ

Add retry mechanism for indirect Admin Queue (AQ) commands. To do so we
need to keep the command buffer.

This technically reverts commit 43a630e37e25
("ice: remove unused buffer copy code in ice_sq_send_cmd_retry()"),
but combines it with a fix in the logic by using a kmemdup() call,
making it more robust and less likely to break in the future due to
programmer error.

Cc: Michal Schmidt <mschmidt@redhat.com>
Cc: stable@vger.kernel.org
Fixes: 3056df93f7a8 ("ice: Re-send some AQ commands, as result of EBUSY AQ error")
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>
Reviewed-by: Paul Menzel <pmenzel@molgen.mpg.de>
Tested-by: Rinitha S <sx.rinitha@intel.com> (A Contingent worker at Intel)
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>

diff --git a/drivers/net/ethernet/intel/ice/ice_common.c b/drivers/net/ethernet/intel/ice/ice_common.c
index 74fe742..fd32c31 100644 (file)
--- a/drivers/net/ethernet/intel/ice/ice_common.c
+++ b/drivers/net/ethernet/intel/ice/ice_common.c
@@ -1841,6 +1841,7 @@ ice_sq_send_cmd_retry(struct ice_hw *hw, struct ice_ctl_q_info *cq,
 {
        struct libie_aq_desc desc_cpy;
        bool is_cmd_for_retry;
+       u8 *buf_cpy = NULL;
        u8 idx = 0;
        u16 opcode;
        int status;
@@ -1850,8 +1851,11 @@ ice_sq_send_cmd_retry(struct ice_hw *hw, struct ice_ctl_q_info *cq,
        memset(&desc_cpy, 0, sizeof(desc_cpy));
 
        if (is_cmd_for_retry) {
-               /* All retryable cmds are direct, without buf. */
-               WARN_ON(buf);
+               if (buf) {
+                       buf_cpy = kmemdup(buf, buf_size, GFP_KERNEL);
+                       if (!buf_cpy)
+                               return -ENOMEM;
+               }
 
                memcpy(&desc_cpy, desc, sizeof(desc_cpy));
        }
@@ -1863,12 +1867,14 @@ ice_sq_send_cmd_retry(struct ice_hw *hw, struct ice_ctl_q_info *cq,
                    hw->adminq.sq_last_status != LIBIE_AQ_RC_EBUSY)
                        break;
 
+               if (buf_cpy)
+                       memcpy(buf, buf_cpy, buf_size);
                memcpy(desc, &desc_cpy, sizeof(desc_cpy));
-
                msleep(ICE_SQ_SEND_DELAY_TIME_MS);
 
        } while (++idx < ICE_SQ_SEND_MAX_EXECUTE);
 
+       kfree(buf_cpy);
        return status;
 }