qed: Use the bitmap API to simplify some functions

'cid_map' is a bitmap. So use 'bitmap_zalloc()' to simplify code,
improve the semantic and avoid some open-coded arithmetic in allocator
arguments.

Also change the corresponding 'kfree()' into 'bitmap_free()' to keep
consistency.

Also change some 'memset()' into 'bitmap_zero()' to keep consistency. This
is also much less verbose.
Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/qlogic/qed/qed_cxt.c

@@ -1036,12 +1036,12 @@ static void qed_cid_map_free(struct qed_hwfn *p_hwfn)
 	u32 type, vf;
 
 	for (type = 0; type < MAX_CONN_TYPES; type++) {
-		kfree(p_mngr->acquired[type].cid_map);
+		bitmap_free(p_mngr->acquired[type].cid_map);
 		p_mngr->acquired[type].max_count = 0;
 		p_mngr->acquired[type].start_cid = 0;
 
 		for (vf = 0; vf < MAX_NUM_VFS; vf++) {
-			kfree(p_mngr->acquired_vf[type][vf].cid_map);
+			bitmap_free(p_mngr->acquired_vf[type][vf].cid_map);
 			p_mngr->acquired_vf[type][vf].max_count = 0;
 			p_mngr->acquired_vf[type][vf].start_cid = 0;
 		}
@@ -1054,15 +1054,10 @@ qed_cid_map_alloc_single(struct qed_hwfn *p_hwfn,
 			 u32 cid_start,
 			 u32 cid_count, struct qed_cid_acquired_map *p_map)
 {
-	u32 size;
-
 	if (!cid_count)
 		return 0;
 
-	size = DIV_ROUND_UP(cid_count,
-			    sizeof(unsigned long) * BITS_PER_BYTE) *
-	       sizeof(unsigned long);
-	p_map->cid_map = kzalloc(size, GFP_KERNEL);
+	p_map->cid_map = bitmap_zalloc(cid_count, GFP_KERNEL);
 	if (!p_map->cid_map)
 		return -ENOMEM;
 
@@ -1216,7 +1211,6 @@ void qed_cxt_mngr_setup(struct qed_hwfn *p_hwfn)
 	struct qed_cid_acquired_map *p_map;
 	struct qed_conn_type_cfg *p_cfg;
 	int type;
-	u32 len;
 
 	/* Reset acquired cids */
 	for (type = 0; type < MAX_CONN_TYPES; type++) {
@@ -1225,11 +1219,7 @@ void qed_cxt_mngr_setup(struct qed_hwfn *p_hwfn)
 		p_cfg = &p_mngr->conn_cfg[type];
 		if (p_cfg->cid_count) {
 			p_map = &p_mngr->acquired[type];
-			len = DIV_ROUND_UP(p_map->max_count,
-					   sizeof(unsigned long) *
-					   BITS_PER_BYTE) *
-			      sizeof(unsigned long);
-			memset(p_map->cid_map, 0, len);
+			bitmap_zero(p_map->cid_map, p_map->max_count);
 		}
 
 		if (!p_cfg->cids_per_vf)
@@ -1237,11 +1227,7 @@ void qed_cxt_mngr_setup(struct qed_hwfn *p_hwfn)
 
 		for (vf = 0; vf < MAX_NUM_VFS; vf++) {
 			p_map = &p_mngr->acquired_vf[type][vf];
-			len = DIV_ROUND_UP(p_map->max_count,
-					   sizeof(unsigned long) *
-					   BITS_PER_BYTE) *
-			      sizeof(unsigned long);
-			memset(p_map->cid_map, 0, len);
+			bitmap_zero(p_map->cid_map, p_map->max_count);
 		}
 	}
 }