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From: "Zhao1, Wei" <wei.zhao1@intel.com>
To: "Yigit, Ferruh" <ferruh.yigit@intel.com>, "dev@dpdk.org" <dev@dpdk.org>
Cc: "stable@dpdk.org" <stable@dpdk.org>,
	"stephen@networkplumber.org" <stephen@networkplumber.org>,
	"Ananyev, Konstantin" <konstantin.ananyev@intel.com>
Subject: Re: [dpdk-dev] [dpdk-stable] [PATCH v3] app/testpmd: fix support of hex string parser for flow API
Date: Tue, 9 Apr 2019 07:38:28 +0000	[thread overview]
Message-ID: <A2573D2ACFCADC41BB3BE09C6DE313CA07EDB16C@PGSMSX103.gar.corp.intel.com> (raw)
In-Reply-To: <dcb1eb47-af78-abcc-32ce-68919eb57740@intel.com>

Hi,  Ferruh

> -----Original Message-----
> From: Yigit, Ferruh
> Sent: Friday, March 22, 2019 10:56 PM
> To: Zhao1, Wei <wei.zhao1@intel.com>; dev@dpdk.org
> Cc: stable@dpdk.org; stephen@networkplumber.org; Ananyev, Konstantin
> <konstantin.ananyev@intel.com>
> Subject: Re: [dpdk-stable] [PATCH v3] app/testpmd: fix support of hex string
> parser for flow API
> 
> On 3/22/2019 3:15 AM, Wei Zhao wrote:
> > 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>
> 
> <...>
> 
> > @@ -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;
> > +}
> 
> I can see this has been discussed already but what would you think updating
> the 'parse_hex_string' something like following, it is less code to maintain:
> 
> static int
> parse_hex_string(const char *src, uint8_t *dst, uint32_t *size) {
>   int len;
>   int i
>   for (i = 0, len = 0; i < *size; i += 2) {
>     char tmp[3];
>     snprintf(tmp, 3, src + i);
>     dst[len++] = strtoul(tmp, NULL, 16);
>   }
>   dst[len] = 0;
>   *size = len;
>   return 0;
> }
> 
> (indeed with better error checking on strtoul ;) )
> 
> <...>



I have change code style as your guide as bellow, 
but strtoul() seems do not work, it return c with a none-null every time.
you can have a try yourself.


static int
parse_hex_string(const char *src, uint8_t *dst, uint32_t *size)
{
	char *c = NULL;
	uint32_t i, len;
	char tmp[3];

	/* Check input parameters */
	if ((src == NULL) ||
		(dst == NULL) ||
		(size == NULL) ||
		(*size == 0))
		return -1;

	/* Convert chars to bytes */
	for (i = 0, len = 0; i < *size; i += 2) {
		snprintf(tmp, 3, "%s" ,src + i);
		dst[len++] = strtoul(tmp, &c, 16);
		if(c)
			return -1;	
 	}
	dst[len] = 0;
	*size = len;

	return 0;
}

> 
> > +	/* Output buffer is not necessarily NUL-terminated. */
> > +	memcpy(buf, hex_tmp, hexlen);
> > +	memset((uint8_t *)buf + len, 0x00, size - hexlen);
> 
> Can't this overflow the 'buf'? since "len = 2 * hexlen"
> I guess intention is "buf + hexlen"

  parent reply	other threads:[~2019-04-09  7:38 UTC|newest]

Thread overview: 48+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-03-15  8:43 [dpdk-dev] [PATCH] " Wei Zhao
2019-03-15  8:43 ` Wei Zhao
2019-03-15  9:44 ` Ananyev, Konstantin
2019-03-15  9:44   ` Ananyev, Konstantin
2019-03-18  1:36   ` Zhao1, Wei
2019-03-18  1:36     ` Zhao1, Wei
2019-03-18  8:49   ` Zhao1, Wei
2019-03-18  8:49     ` Zhao1, Wei
2019-03-21 14:03     ` Ananyev, Konstantin
2019-03-21 14:03       ` Ananyev, Konstantin
2019-03-22  1:34       ` Zhao1, Wei
2019-03-22  1:34         ` Zhao1, Wei
2019-03-18  8:16 ` [dpdk-dev] [PATCH v2] " Wei Zhao
2019-03-18  8:16   ` Wei Zhao
2019-03-19  5:23   ` Zhao1, Wei
2019-03-19  5:23     ` Zhao1, Wei
2019-03-22  3:15   ` [dpdk-dev] [PATCH v3] " Wei Zhao
2019-03-22  3:15     ` Wei Zhao
2019-03-22 14:56     ` [dpdk-dev] [dpdk-stable] " Ferruh Yigit
2019-03-22 14:56       ` Ferruh Yigit
2019-03-25  3:39       ` Zhao1, Wei
2019-03-25  3:39         ` Zhao1, Wei
2019-03-25  8:45         ` Ferruh Yigit
2019-03-25  8:45           ` Ferruh Yigit
2019-03-25  9:25           ` Zhao1, Wei
2019-03-25  9:25             ` Zhao1, Wei
2019-03-25  9:35             ` Ferruh Yigit
2019-03-25  9:35               ` Ferruh Yigit
2019-03-25  9:39               ` Zhao1, Wei
2019-03-25  9:39                 ` Zhao1, Wei
2019-04-09  7:38       ` Zhao1, Wei [this message]
2019-04-09  7:38         ` Zhao1, Wei
2019-04-09  8:44         ` Ferruh Yigit
2019-04-09  8:44           ` Ferruh Yigit
2019-04-09  9:12           ` Zhao1, Wei
2019-04-09  9:12             ` Zhao1, Wei
2019-04-09  7:40       ` Zhao1, Wei
2019-04-09  7:40         ` Zhao1, Wei
2019-04-09  7:42       ` Zhao1, Wei
2019-04-09  7:42         ` Zhao1, Wei
2019-04-09  8:41     ` [dpdk-dev] [PATCH v4] " Wei Zhao
2019-04-09  8:41       ` Wei Zhao
2019-04-11 18:40       ` Ferruh Yigit
2019-04-11 18:40         ` Ferruh Yigit
2019-03-18 15:27 ` [dpdk-dev] [PATCH] " Stephen Hemminger
2019-03-18 15:27   ` Stephen Hemminger
2019-03-22  1:34   ` Zhao1, Wei
2019-03-22  1:34     ` Zhao1, Wei

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