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

["Zhao1, Wei" <wei.zhao1@intel.com>]

Hi,  Konstantin

> -----Original Message-----
> From: Ananyev, Konstantin
> Sent: Friday, March 15, 2019 5:45 PM
> To: Zhao1, Wei <wei.zhao1@intel.com>; dev@dpdk.org
> Cc: stable@dpdk.org; Zhang, Qi Z <qi.z.zhang@intel.com>;
> adrien.mazarguil@6wind.com; Zhao1, Wei <wei.zhao1@intel.com>
> Subject: RE: [dpdk-dev] [PATCH] app/testpmd: fix support of hex string
> parser for flow API
> 
> Hi Wei,
> 
> >
> > 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>
> > ---
> >  app/test-pmd/cmdline_flow.c | 141
> > +++++++++++++++++++++++++++++++++++++++++++-
> >  1 file changed, 140 insertions(+), 1 deletion(-)
> >
> > diff --git a/app/test-pmd/cmdline_flow.c b/app/test-pmd/cmdline_flow.c
> > index 36659a6..2445731 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",
> > @@ -1544,7 +1555,7 @@ static const struct token token_list[] = {
> >  		.name = "pattern",
> >  		.help = "byte string to look for",
> >  		.next = NEXT(item_raw,
> > -			     NEXT_ENTRY(STRING),
> > +			     NEXT_ENTRY(HEX),
> >  			     NEXT_ENTRY(ITEM_PARAM_IS,
> >  					ITEM_PARAM_SPEC,
> >  					ITEM_PARAM_MASK)),
> > @@ -4475,6 +4486,134 @@ 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 ((((*c) >= '0') && ((*c) <= '9')) ||
> > +			(((*c) >= 'A') && ((*c) <= 'F')) ||
> > +			(((*c) >= 'a') && ((*c) <= 'f')))
> > +			continue;
> > +
> > +		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;
> > +}
> 
> What's wrong with strtoul() and friends?
> Why you need to write your own version?
> Konstantin
> 

Good idea, I WILL replace get_hex_val() with strtoul() in v2.

> > +
> > +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;
> > +	uint8_t hex_tmp[16];
> > +
> > +	/* 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 || size < len)
> > +		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;
> > +	}
> > +	parse_hex_string(str, hex_tmp, &hexlen);
> > +	/* 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