From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from dpdk.org (dpdk.org [92.243.14.124]) by dpdk.space (Postfix) with ESMTP id 3DBE2A05D3 for ; Mon, 25 Mar 2019 10:35:58 +0100 (CET) Received: from [92.243.14.124] (localhost [127.0.0.1]) by dpdk.org (Postfix) with ESMTP id 7ACB22C60; Mon, 25 Mar 2019 10:35:56 +0100 (CET) Received: from mga06.intel.com (mga06.intel.com [134.134.136.31]) by dpdk.org (Postfix) with ESMTP id B7B0D11A4; Mon, 25 Mar 2019 10:35:54 +0100 (CET) X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga005.jf.intel.com ([10.7.209.41]) by orsmga104.jf.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 25 Mar 2019 02:35:53 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.60,256,1549958400"; d="scan'208";a="310186839" Received: from fyigit-mobl.ger.corp.intel.com (HELO [10.237.221.46]) ([10.237.221.46]) by orsmga005.jf.intel.com with ESMTP; 25 Mar 2019 02:35:51 -0700 To: "Zhao1, Wei" , "dev@dpdk.org" Cc: "stable@dpdk.org" , "stephen@networkplumber.org" , "Ananyev, Konstantin" References: <1552896961-33681-1-git-send-email-wei.zhao1@intel.com> <1553224548-37749-1-git-send-email-wei.zhao1@intel.com> From: Ferruh Yigit Openpgp: preference=signencrypt Autocrypt: addr=ferruh.yigit@intel.com; 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WOW64; rv:60.0) Gecko/20100101 Thunderbird/60.6.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset="UTF-8" Content-Language: en-US Content-Transfer-Encoding: 8bit Subject: Re: [dpdk-dev] [dpdk-stable] [PATCH v3] app/testpmd: fix support of hex string parser for flow API X-BeenThere: dev@dpdk.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: DPDK patches and discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dev-bounces@dpdk.org Sender: "dev" Message-ID: <20190325093551.cE5-LQfcxB34071V1RFaUWPbCY3xRVqR7ZirSGkRU-0@z> On 3/25/2019 9:25 AM, Zhao1, Wei wrote: > Hi，Ferruh > >> -----Original Message----- >> From: Yigit, Ferruh >> Sent: Monday, March 25, 2019 4:46 PM >> To: Zhao1, Wei ; dev@dpdk.org >> Cc: stable@dpdk.org; stephen@networkplumber.org; Ananyev, Konstantin >> >> Subject: Re: [dpdk-stable] [PATCH v3] app/testpmd: fix support of hex string >> parser for flow API >> >> On 3/25/2019 3:39 AM, Zhao1, Wei wrote: >>> Hi, >>> >>>> -----Original Message----- >>>> From: Yigit, Ferruh >>>> Sent: Friday, March 22, 2019 10:56 PM >>>> To: Zhao1, Wei ; dev@dpdk.org >>>> Cc: stable@dpdk.org; stephen@networkplumber.org; Ananyev, >> Konstantin >>>> >>>> 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 >>>>> Tested-by: Peng Yuan >>>> >>>> <...> >>>> >>>>> @@ -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 ;) ) >>> >>> >>> Why delete these check from parse_hex_string()? >> >> The point is using 'strtoul' instead of your functions, so that you won't need >> 'get_hex_val()' at all, or won't need 'isxdigit()' because 'strtoul' will check it, >> won't need size should be multiply of two restriction '(*size & 1)' because of >> implementation change. Probably you will need NULL checks, but again point >> is why not using 'strtoul' instead of writing your version of it? > > Yes, we can use 'strtoul' , but my point is that I think we need these check code even if we use the code 'strtoul' . > isxdigit(*c)) is need because *c may be sring "0xrgh" which is not hex. > If we use strtoul will return 0 for that ,we can not distinguish between error or input is zero. > '(*size & 1) can be delete, I agree. > > /* Check input parameters */ > if ((src == NULL) || > (dst == NULL) || > (size == NULL) || > (*size == 0)) > return -1; > for (c = src, i = 0; i < *size; c++, i++) { > if (isxdigit(*c)) > continue; > else > return -1; > } > Please feel free to keep/add whatever check is required, I wasn't suggesting the final implementation. 'strtol' can detect invalid chars, by providing non-NULL to second argument, so 'isxdigit()' is not required but more checks needed. Overall you previously mentioned 'strtol' can't be used, but it can be used and I believe it is better way to go, but I am asking what do you think about it? Checks and implementation details can be handled. > >>> >>> /* 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; >>> } >>> >>> >>> >>>> >>>> <...> >>>> >>>>> + /* 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" >