[net-next v2 01/15] ice: cleanup stack hog

[Tony Nguyen]

From: Bruce Allan <bruce.w.al...@intel.com>

In ice_flow_add_prof_sync(), struct ice_flow_prof_params has recently
grown in size hogging stack space when allocated there.  Hogging stack
space should be avoided.  Change allocation to be on the heap when needed.

Signed-off-by: Bruce Allan <bruce.w.al...@intel.com>
Tested-by: Harikumar Bokkena <harikumarx.bokk...@intel.com>
Signed-off-by: Tony Nguyen <anthony.l.ngu...@intel.com>
---
 drivers/net/ethernet/intel/ice/ice_flow.c | 44 +++++++++++++----------
 1 file changed, 26 insertions(+), 18 deletions(-)

diff --git a/drivers/net/ethernet/intel/ice/ice_flow.c 
b/drivers/net/ethernet/intel/ice/ice_flow.c
index eadc85aee389..2a92071bd7d1 100644
--- a/drivers/net/ethernet/intel/ice/ice_flow.c
+++ b/drivers/net/ethernet/intel/ice/ice_flow.c
@@ -708,37 +708,42 @@ ice_flow_add_prof_sync(struct ice_hw *hw, enum ice_block 
blk,
                       struct ice_flow_seg_info *segs, u8 segs_cnt,
                       struct ice_flow_prof **prof)
 {
-       struct ice_flow_prof_params params;
+       struct ice_flow_prof_params *params;
        enum ice_status status;
        u8 i;
 
        if (!prof)
                return ICE_ERR_BAD_PTR;
 
-       memset(&params, 0, sizeof(params));
-       params.prof = devm_kzalloc(ice_hw_to_dev(hw), sizeof(*params.prof),
-                                  GFP_KERNEL);
-       if (!params.prof)
+       params = kzalloc(sizeof(*params), GFP_KERNEL);
+       if (!params)
                return ICE_ERR_NO_MEMORY;
 
+       params->prof = devm_kzalloc(ice_hw_to_dev(hw), sizeof(*params->prof),
+                                   GFP_KERNEL);
+       if (!params->prof) {
+               status = ICE_ERR_NO_MEMORY;
+               goto free_params;
+       }
+
        /* initialize extraction sequence to all invalid (0xff) */
        for (i = 0; i < ICE_MAX_FV_WORDS; i++) {
-               params.es[i].prot_id = ICE_PROT_INVALID;
-               params.es[i].off = ICE_FV_OFFSET_INVAL;
+               params->es[i].prot_id = ICE_PROT_INVALID;
+               params->es[i].off = ICE_FV_OFFSET_INVAL;
        }
 
-       params.blk = blk;
-       params.prof->id = prof_id;
-       params.prof->dir = dir;
-       params.prof->segs_cnt = segs_cnt;
+       params->blk = blk;
+       params->prof->id = prof_id;
+       params->prof->dir = dir;
+       params->prof->segs_cnt = segs_cnt;
 
        /* Make a copy of the segments that need to be persistent in the flow
         * profile instance
         */
        for (i = 0; i < segs_cnt; i++)
-               memcpy(&params.prof->segs[i], &segs[i], sizeof(*segs));
+               memcpy(&params->prof->segs[i], &segs[i], sizeof(*segs));
 
-       status = ice_flow_proc_segs(hw, &params);
+       status = ice_flow_proc_segs(hw, params);
        if (status) {
                ice_debug(hw, ICE_DBG_FLOW,
                          "Error processing a flow's packet segments\n");
@@ -746,19 +751,22 @@ ice_flow_add_prof_sync(struct ice_hw *hw, enum ice_block 
blk,
        }
 
        /* Add a HW profile for this flow profile */
-       status = ice_add_prof(hw, blk, prof_id, (u8 *)params.ptypes, params.es);
+       status = ice_add_prof(hw, blk, prof_id, (u8 *)params->ptypes,
+                             params->es);
        if (status) {
                ice_debug(hw, ICE_DBG_FLOW, "Error adding a HW flow profile\n");
                goto out;
        }
 
-       INIT_LIST_HEAD(&params.prof->entries);
-       mutex_init(&params.prof->entries_lock);
-       *prof = params.prof;
+       INIT_LIST_HEAD(&params->prof->entries);
+       mutex_init(&params->prof->entries_lock);
+       *prof = params->prof;
 
 out:
        if (status)
-               devm_kfree(ice_hw_to_dev(hw), params.prof);
+               devm_kfree(ice_hw_to_dev(hw), params->prof);
+free_params:
+       kfree(params);
 
        return status;
 }
-- 
2.26.2