netdev - [PATCH iwl-next v2 3/7] ice: Simplify bitmap setting in adding recipe

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Date: Mon, 24 Jun 2024 16:45:26 +0200
From: Marcin Szycik <marcin.szycik@...ux.intel.com>
To: intel-wired-lan@...ts.osuosl.org
Cc: netdev@...r.kernel.org,
	michal.swiatkowski@...ux.intel.com,
	przemyslaw.kitszel@...el.com,
	aleksander.lobakin@...el.com,
	Marcin Szycik <marcin.szycik@...ux.intel.com>
Subject: [PATCH iwl-next v2 3/7] ice: Simplify bitmap setting in adding recipe

From: Michal Swiatkowski <michal.swiatkowski@...ux.intel.com>

Remove unnecessary size checks when copying bitmaps in ice_add_sw_recipe()
and replace them with compile time assert. Check if the bitmaps are equal
size, as they are copied both ways.

Signed-off-by: Michal Swiatkowski <michal.swiatkowski@...ux.intel.com>
Reviewed-by: Przemek Kitszel <przemyslaw.kitszel@...el.com>
Co-developed-by: Marcin Szycik <marcin.szycik@...ux.intel.com>
Signed-off-by: Marcin Szycik <marcin.szycik@...ux.intel.com>
---
v2: Replace sizeof(((struct s*)0)->f with sizeof_field() (thanks Alex!)
---
 drivers/net/ethernet/intel/ice/ice_switch.c | 24 ++++++++-------------
 1 file changed, 9 insertions(+), 15 deletions(-)

diff --git a/drivers/net/ethernet/intel/ice/ice_switch.c b/drivers/net/ethernet/intel/ice/ice_switch.c
index da065512889d..3ee4242f9880 100644
--- a/drivers/net/ethernet/intel/ice/ice_switch.c
+++ b/drivers/net/ethernet/intel/ice/ice_switch.c
@@ -5067,6 +5067,10 @@ ice_find_free_recp_res_idx(struct ice_hw *hw, const unsigned long *profiles,
 	return (u16)bitmap_weight(free_idx, ICE_MAX_FV_WORDS);
 }
 
+/* For memcpy in ice_add_sw_recipe. */
+static_assert(sizeof_field(struct ice_aqc_recipe_data_elem, recipe_bitmap) ==
+	      sizeof_field(struct ice_sw_recipe, r_bitmap));
+
 /**
  * ice_add_sw_recipe - function to call AQ calls to create switch recipe
  * @hw: pointer to hardware structure
@@ -5187,13 +5191,9 @@ ice_add_sw_recipe(struct ice_hw *hw, struct ice_sw_recipe *rm,
 		rm->root_rid = buf[0].recipe_indx;
 		set_bit(buf[0].recipe_indx, rm->r_bitmap);
 		buf[0].content.rid = rm->root_rid | ICE_AQ_RECIPE_ID_IS_ROOT;
-		if (sizeof(buf[0].recipe_bitmap) >= sizeof(rm->r_bitmap)) {
-			memcpy(buf[0].recipe_bitmap, rm->r_bitmap,
-			       sizeof(buf[0].recipe_bitmap));
-		} else {
-			status = -EINVAL;
-			goto err_unroll;
-		}
+		memcpy(buf[0].recipe_bitmap, rm->r_bitmap,
+		       sizeof(buf[0].recipe_bitmap));
+
 		/* Applicable only for ROOT_RECIPE, set the fwd_priority for
 		 * the recipe which is getting created if specified
 		 * by user. Usually any advanced switch filter, which results
@@ -5256,14 +5256,8 @@ ice_add_sw_recipe(struct ice_hw *hw, struct ice_sw_recipe *rm,
 			set_bit(entry->rid, rm->r_bitmap);
 		}
 		list_add(&last_chain_entry->l_entry, &rm->rg_list);
-		if (sizeof(buf[recps].recipe_bitmap) >=
-		    sizeof(rm->r_bitmap)) {
-			memcpy(buf[recps].recipe_bitmap, rm->r_bitmap,
-			       sizeof(buf[recps].recipe_bitmap));
-		} else {
-			status = -EINVAL;
-			goto err_unroll;
-		}
+		memcpy(buf[recps].recipe_bitmap, rm->r_bitmap,
+		       sizeof(buf[recps].recipe_bitmap));
 		content->act_ctrl_fwd_priority = rm->priority;
 
 		recps++;
-- 
2.45.0