devtools: forbid variable declaration inside for

Some compilers raise an error when declaring a variable
in the middle of a function. This is a C99 allowance.
Even if DPDK switches globally to C99 or C11 standard,
the coding rules are for declarations at the beginning
of a block:
http://doc.dpdk.org/guides/contributing/coding_style.html#local-variables

This coding style is enforced by adding a check of
the common patterns like "for (int i;"

The occurrences of the checked pattern are fixed:
	'for *(\(char\|u\?int\|unsigned\|s\?size_t\)'
In the file dpaa2_sparser.c, the fix is to remove the unused macros.

Signed-off-by: Thomas Monjalon <thomas@monjalon.net>
Acked-by: David Marchand <david.marchand@redhat.com>

devtools/checkpatches.sh

@@ -69,6 +69,14 @@ check_forbidden_additions() { # <patch>
 		-f $(dirname $(readlink -f $0))/check-forbidden-tokens.awk \
 		"$1" || res=1
 
+	# forbid variable declaration inside "for" loop
+	awk -v FOLDERS='.' \
+		-v EXPRESSIONS='for *\\((char|u?int|unsigned|s?size_t)' \
+		-v RET_ON_FAIL=1 \
+		-v MESSAGE='Declaring a variable inside for()' \
+		-f $(dirname $(readlink -f $0))/check-forbidden-tokens.awk \
+		"$1" || res=1
+
 	# svg figures must be included with wildcard extension
 	# because of png conversion for pdf docs
 	awk -v FOLDERS='doc' \

doc/guides/prog_guide/eventdev.rst

@@ -242,9 +242,10 @@ Once queues are set up successfully, create the ports as required.
         };
         int dev_id = 0;
         int rx_port_id = 0;
+        int worker_port_id;
         int err = rte_event_port_setup(dev_id, rx_port_id, &rx_conf);
 
-        for(int worker_port_id = 1; worker_port_id <= 4; worker_port_id++) {
+        for (worker_port_id = 1; worker_port_id <= 4; worker_port_id++) {
 	        int err = rte_event_port_setup(dev_id, worker_port_id, &worker_conf);
         }
 
@@ -277,8 +278,9 @@ can be achieved like this:
         uint8_t atomic_qs[] = {0, 1};
         uint8_t single_link_q = 2;
         uint8_t priority = RTE_EVENT_DEV_PRIORITY_NORMAL;
+        int worker_port_id;
 
-        for(int worker_port_id = 1; worker_port_id <= 4; worker_port_id++) {
+        for (worker_port_id = 1; worker_port_id <= 4; worker_port_id++) {
                 int links_made = rte_event_port_link(dev_id, worker_port_id, atomic_qs, NULL, 2);
         }
         int links_made = rte_event_port_link(dev_id, tx_port_id, &single_link_q, &priority, 1);

drivers/common/mlx5/linux/mlx5_glue.c

@@ -587,11 +587,12 @@ mlx5_glue_dv_create_flow(void *matcher,
 	return mlx5dv_dr_rule_create(matcher, match_value, num_actions,
 				     (struct mlx5dv_dr_action **)actions);
 #else
+	size_t i;
 	struct mlx5dv_flow_action_attr actions_attr[8];
 
 	if (num_actions > 8)
 		return NULL;
-	for (size_t i = 0; i < num_actions; i++)
+	for (i = 0; i < num_actions; i++)
 		actions_attr[i] =
 			*((struct mlx5dv_flow_action_attr *)(actions[i]));
 	return mlx5dv_create_flow(matcher, match_value,

drivers/common/mlx5/mlx5_devx_cmds.c

@@ -416,7 +416,7 @@ mlx5_devx_cmd_query_hca_attr(void *ctx,
 	uint32_t in[MLX5_ST_SZ_DW(query_hca_cap_in)] = {0};
 	uint32_t out[MLX5_ST_SZ_DW(query_hca_cap_out)] = {0};
 	void *hcattr;
-	int status, syndrome, rc;
+	int status, syndrome, rc, i;
 
 	MLX5_SET(query_hca_cap_in, in, opcode, MLX5_CMD_OP_QUERY_HCA_CAP);
 	MLX5_SET(query_hca_cap_in, in, op_mod,
@@ -532,7 +532,7 @@ mlx5_devx_cmd_query_hca_attr(void *ctx,
 	attr->lro_max_msg_sz_mode = MLX5_GET
 					(per_protocol_networking_offload_caps,
 					 hcattr, lro_max_msg_sz_mode);
-	for (int i = 0 ; i < MLX5_LRO_NUM_SUPP_PERIODS ; i++) {
+	for (i = 0 ; i < MLX5_LRO_NUM_SUPP_PERIODS ; i++) {
 		attr->lro_timer_supported_periods[i] =
 			MLX5_GET(per_protocol_networking_offload_caps, hcattr,
 				 lro_timer_supported_periods[i]);

drivers/crypto/caam_jr/caam_jr.c

@@ -1351,6 +1351,9 @@ caam_jr_enqueue_op(struct rte_crypto_op *op, struct caam_jr_qp *qp)
 	struct caam_jr_session *ses;
 	struct caam_jr_op_ctx *ctx = NULL;
 	struct sec_job_descriptor_t *jobdescr __rte_unused;
+#if CAAM_JR_DBG
+	int i;
+#endif
 
 	switch (op->sess_type) {
 	case RTE_CRYPTO_OP_WITH_SESSION:
@@ -1413,7 +1416,7 @@ err1:
 			rte_pktmbuf_data_len(op->sym->m_src));
 
 	printf("\n JD before conversion\n");
-	for (int i = 0; i < 12; i++)
+	for (i = 0; i < 12; i++)
 		printf("\n 0x%08x", ctx->jobdes.desc[i]);
 #endif
 

drivers/net/dpaa2/dpaa2_sparser.c

@@ -145,36 +145,6 @@ struct frame_attr_ext frame_attr_ext_arr[] = {
 	/* 112 */ {NULL,                                       0, 0x0000}
 };
 
-#define SWAP_WORD(pr)						\
-do {								\
-	for (int i = 0; i < 4 ; i++) {				\
-		pr[i] = pr[i] ^ pr[6 - i + 1];			\
-		pr[6 - i + 1] = pr[6 - i + 1] ^ pr[i];		\
-		pr[i] = pr[i] ^ pr[6 - i + 1];			\
-	}							\
-} while (0)
-
-#define fa_print_sb()						\
-do {								\
-	if (rte_cpu_to_be_32(*pdw) & frm_attr->fld_mask)	\
-		DPAA2_PMD_DP_DEBUG("t %s : Yes", frm_attr->fld_name);	\
-} while (0)
-
-#define fa_print_sb_ext()					\
-do {								\
-	if (rte_cpu_to_be_16(*pw) & frm_attr_ext->fld_mask)	\
-		DPAA2_PMD_DP_DEBUG("\t %s : Yes",			\
-			  frm_attr_ext->fld_name);		\
-} while (0)
-
-#define fa_print_mb_ext()					\
-do {								\
-	if (rte_cpu_to_be_16(*pw) & frm_attr_ext->fld_mask)	\
-		DPAA2_PMD_DP_DEBUG("\t %s : 0x%02x",			\
-			  frm_attr_ext->fld_name,		\
-			  rte_cpu_to_be_16(*pw) & frm_attr_ext->fld_mask);\
-} while (0)
-
 int dpaa2_eth_load_wriop_soft_parser(struct dpaa2_dev_priv *priv,
 				     enum dpni_soft_sequence_dest dest)
 {