[dpdk-dev] [PATCH v3] app/testpmd: fix support of hex string parser for flow API

[Wei Zhao <wei.zhao1@intel.com>]

There is need for users to set configuration of HEX number for RSS
key. The key byte should be pass down as hex number not as char
string. This patch enable cmdline flow parse HEX number,
in order to not using string which pass ASIC number.

Fixes: f4d623f96119 ("app/testpmd: fix missing RSS fields in flow action")
Cc: stable@dpdk.org

Signed-off-by: Wei Zhao <wei.zhao1@intel.com>
Tested-by: Peng Yuan <yuan.peng@intel.com>

---

v2:
fix bug of string length limite.

v3:
use isxdigit to check char string
---
 app/test-pmd/cmdline_flow.c | 145 +++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 144 insertions(+), 1 deletion(-)

diff --git a/app/test-pmd/cmdline_flow.c b/app/test-pmd/cmdline_flow.c
index 36659a6..4bc033c 100644
--- a/app/test-pmd/cmdline_flow.c
+++ b/app/test-pmd/cmdline_flow.c
@@ -35,6 +35,7 @@ enum index {
 	PREFIX,
 	BOOLEAN,
 	STRING,
+	HEX,
 	MAC_ADDR,
 	IPV4_ADDR,
 	IPV6_ADDR,
@@ -1122,6 +1123,9 @@ static int parse_boolean(struct context *, const struct token *,
 static int parse_string(struct context *, const struct token *,
 			const char *, unsigned int,
 			void *, unsigned int);
+static int parse_hex(struct context *ctx, const struct token *token,
+			const char *str, unsigned int len,
+			void *buf, unsigned int size);
 static int parse_mac_addr(struct context *, const struct token *,
 			  const char *, unsigned int,
 			  void *, unsigned int);
@@ -1198,6 +1202,13 @@ static const struct token token_list[] = {
 		.call = parse_string,
 		.comp = comp_none,
 	},
+	[HEX] = {
+		.name = "{hex}",
+		.type = "HEX",
+		.help = "fixed string",
+		.call = parse_hex,
+		.comp = comp_none,
+	},
 	[MAC_ADDR] = {
 		.name = "{MAC address}",
 		.type = "MAC-48",
@@ -2306,7 +2317,7 @@ static const struct token token_list[] = {
 	[ACTION_RSS_KEY] = {
 		.name = "key",
 		.help = "RSS hash key",
-		.next = NEXT(action_rss, NEXT_ENTRY(STRING)),
+		.next = NEXT(action_rss, NEXT_ENTRY(HEX)),
 		.args = ARGS(ARGS_ENTRY_ARB(0, 0),
 			     ARGS_ENTRY_ARB
 			     (offsetof(struct action_rss_data, conf) +
@@ -4475,6 +4486,138 @@ parse_string(struct context *ctx, const struct token *token,
 	return -1;
 }
 
+static uint32_t
+get_hex_val(char c)
+{
+	switch (c) {
+	case '0': case '1': case '2': case '3': case '4': case '5':
+	case '6': case '7': case '8': case '9':
+		return c - '0';
+	case 'A': case 'B': case 'C': case 'D': case 'E': case 'F':
+		return c - 'A' + 10;
+	case 'a': case 'b': case 'c': case 'd': case 'e': case 'f':
+		return c - 'a' + 10;
+	default:
+		return 0;
+	}
+}
+
+static int
+parse_hex_string(const char *src, uint8_t *dst, uint32_t *size)
+{
+	const char *c;
+	uint32_t i;
+
+	/* Check input parameters */
+	if ((src == NULL) ||
+		(dst == NULL) ||
+		(size == NULL) ||
+		(*size == 0))
+		return -1;
+	if ((*size & 1) != 0)
+		return -1;
+
+	for (c = src, i = 0; i < *size; c++, i++) {
+		if (isxdigit(*c))
+			continue;
+		else
+			return -1;
+	}
+
+	*size = *size / 2;
+
+	/* Convert chars to bytes */
+	for (i = 0; i < *size; i++)
+		dst[i] = get_hex_val(src[2 * i]) * 16 +
+			get_hex_val(src[2 * i + 1]);
+
+	return 0;
+}
+
+static int
+parse_hex(struct context *ctx, const struct token *token,
+		const char *str, unsigned int len,
+		void *buf, unsigned int size)
+{
+	const struct arg *arg_data = pop_args(ctx);
+	const struct arg *arg_len = pop_args(ctx);
+	const struct arg *arg_addr = pop_args(ctx);
+	char tmp[16]; /* Ought to be enough. */
+	int ret;
+	unsigned int hexlen = len;
+	unsigned int length = 256;
+	uint8_t hex_tmp[length];
+
+	/* Arguments are expected. */
+	if (!arg_data)
+		return -1;
+	if (!arg_len) {
+		push_args(ctx, arg_data);
+		return -1;
+	}
+	if (!arg_addr) {
+		push_args(ctx, arg_len);
+		push_args(ctx, arg_data);
+		return -1;
+	}
+	size = arg_data->size;
+	/* Bit-mask fill is not supported. */
+	if (arg_data->mask)
+		goto error;
+	if (!ctx->object)
+		return len;
+
+	/* translate bytes string to array. */
+	if (str[0] == '0' && ((str[1] == 'x') ||
+			(str[1] == 'X'))) {
+		str += 2;
+		hexlen -= 2;
+	}
+	if (hexlen > length)
+		return -1;
+	ret = parse_hex_string(str, hex_tmp, &hexlen);
+	if (ret < 0)
+		goto error;
+	/* Let parse_int() fill length information first. */
+	ret = snprintf(tmp, sizeof(tmp), "%u", hexlen);
+	if (ret < 0)
+		goto error;
+	push_args(ctx, arg_len);
+	ret = parse_int(ctx, token, tmp, ret, NULL, 0);
+	if (ret < 0) {
+		pop_args(ctx);
+		goto error;
+	}
+	buf = (uint8_t *)ctx->object + arg_data->offset;
+	/* Output buffer is not necessarily NUL-terminated. */
+	memcpy(buf, hex_tmp, hexlen);
+	memset((uint8_t *)buf + len, 0x00, size - hexlen);
+	if (ctx->objmask)
+		memset((uint8_t *)ctx->objmask + arg_data->offset,
+					0xff, hexlen);
+	/* Save address if requested. */
+	if (arg_addr->size) {
+		memcpy((uint8_t *)ctx->object + arg_addr->offset,
+		       (void *[]){
+			(uint8_t *)ctx->object + arg_data->offset
+		       },
+		       arg_addr->size);
+		if (ctx->objmask)
+			memcpy((uint8_t *)ctx->objmask + arg_addr->offset,
+			       (void *[]){
+				(uint8_t *)ctx->objmask + arg_data->offset
+			       },
+			       arg_addr->size);
+	}
+	return len;
+error:
+	push_args(ctx, arg_addr);
+	push_args(ctx, arg_len);
+	push_args(ctx, arg_data);
+	return -1;
+
+}
+
 /**
  * Parse a MAC address.
  *
-- 
2.7.5