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Thu, 9 Nov 2023 11:13:06 +0000 Date: Thu, 9 Nov 2023 11:13:01 +0000 From: Bruce Richardson To: Mingjin Ye CC: , , , Subject: Re: [PATCH v4] app/test: append 'allow' parameters to secondary processes Message-ID: References: <20230925094240.2122544-1-mingjinx.ye@intel.com> <20230927034204.2279012-1-mingjinx.ye@intel.com> Content-Type: text/plain; charset="us-ascii" Content-Disposition: inline In-Reply-To: <20230927034204.2279012-1-mingjinx.ye@intel.com> X-ClientProxiedBy: DUZPR01CA0047.eurprd01.prod.exchangelabs.com (2603:10a6:10:469::16) To DS0PR11MB7309.namprd11.prod.outlook.com (2603:10b6:8:13e::17) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: DS0PR11MB7309:EE_|SA1PR11MB5803:EE_ X-MS-Office365-Filtering-Correlation-Id: 11b6c0c5-b2bf-456f-39a5-08dbe114d8dc X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:255.255.255.255; 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When the primary process specifies > the 'allow' parameters and does not specify all devices that use the > vfio-pci driver, the secondary process will not load the devices as > expected, which will return incorrect test results. > > This patch fixes this issue by appending the 'allow' parameters to the > secondary process. > > Fixes: 086eb64db39e ("test/pdump: add unit test for pdump library") > Fixes: 148f963fb532 ("xen: core library changes") > Fixes: af75078fece3 ("first public release") > Fixes: b8d5e544e73e ("test: add procfs error message for multi-process launch") > Cc: stable@dpdk.org > > Signed-off-by: Mingjin Ye > --- > v4: Resolve patch conflicts and optimize code. No issue with the idea of this fix, some impovement suggestions inline below. Once addressed: Acked-by: Bruce Richardson > --- > app/test/process.h | 60 +++++++++++++++++++++++++++++++++++++++++++--- > 1 file changed, 57 insertions(+), 3 deletions(-) > > diff --git a/app/test/process.h b/app/test/process.h > index af7bc3e0de..1cdf28752e 100644 > --- a/app/test/process.h > +++ b/app/test/process.h > @@ -18,6 +18,8 @@ > > #include /* strlcpy */ > > +#include > + > #ifdef RTE_EXEC_ENV_FREEBSD > #define self "curproc" > #define exe "file" > @@ -34,6 +36,47 @@ extern uint16_t flag_for_send_pkts; > #endif > #endif > > +#define PREFIX_ALLOW "--allow" > + > +static int > +add_parameter_allow(char **argv, int max_capacity) > +{ > + struct rte_devargs *devargs; > + int count = 0; > + int name_length, data_length; > + char *dev; > + int malloc_size; > + > + RTE_EAL_DEVARGS_FOREACH(NULL, devargs) { > + if (count >= max_capacity) Since you need two slots for each element, you need to check that count+1 < max_capacity. However, a better solution is to have just one flag for each dev-args. So instead of returning an array with e.g. ["--allow", "a8:00.0", "--allow", "b8:00.0"] instead use the "--allow=" syntax to merge elements, returning: ["--allow=a8:00.0", "--allow=b8:00.0"] this would make your capacity check correct. > + return count; > + > + name_length = strlen(devargs->name); > + if (name_length == 0) > + continue; > + > + if (devargs->data != NULL) > + data_length = strlen(devargs->data); > + else > + data_length = 0; Minor suggestion. Rather than having an else leg here, just move the definitions of name_length and data_length inside the loop, so you can zero-initialize it each time. An even simpler option might be to just use a single malloc_size variable as you don't need the others: malloc_size = strlen(devargs->name) + 1; if (malloc_size == 0) continue; malloc_size += strlen(PREFIX_ALLOW); /* which now has the "=" */ if (devargs->data != NULL) malloc_size += strlen(devargs->data) > + > + malloc_size = name_length + data_length + 1; > + dev = malloc(malloc_size); > + Check for NULL return from malloc. > + memcpy(dev, devargs->name, name_length); > + if (data_length > 0) > + memcpy(dev + name_length, devargs->data, data_length); > + memset(dev + malloc_size - 1, 0, 1); > + > + *(argv + count) = strdup(PREFIX_ALLOW); > + count++; > + > + *(argv + count) = dev; > + count++; > + } > + return count; > +} > + > /* > * launches a second copy of the test process using the given argv parameters, > * which should include argv[0] as the process name. To identify in the > @@ -44,7 +87,9 @@ static inline int > process_dup(const char *const argv[], int numargs, const char *env_value) > { > int num; > - char *argv_cpy[numargs + 1]; > + char **argv_cpy; > + unsigned int allow_num; > + unsigned int argv_num; > int i, status; > char path[32]; > #ifdef RTE_LIB_PDUMP > @@ -58,12 +103,15 @@ process_dup(const char *const argv[], int numargs, const char *env_value) > if (pid < 0) > return -1; > else if (pid == 0) { > + allow_num = rte_devargs_type_count(RTE_DEVTYPE_ALLOWED); > + argv_num = numargs + allow_num * 2 + 1; > + argv_cpy = malloc(argv_num * sizeof(char *)); > /* make a copy of the arguments to be passed to exec */ > for (i = 0; i < numargs; i++) > argv_cpy[i] = strdup(argv[i]); > - argv_cpy[i] = NULL; > num = numargs; > - > + num += add_parameter_allow(&argv_cpy[i], allow_num * 2); If merging flags, you can remove the *2 here and in the argv_num = line. > + argv_cpy[argv_num - 1] = NULL; > #ifdef RTE_EXEC_ENV_LINUX > { > const char *procdir = "/proc/" self "/fd/"; > @@ -131,6 +179,12 @@ process_dup(const char *const argv[], int numargs, const char *env_value) > } > rte_panic("Cannot exec: %s\n", strerror(errno)); > } > + > + for (i = 0; i < num; i++) { > + if (argv_cpy[i] != NULL) > + free(argv_cpy[i]); > + } > + free(argv_cpy); > } > /* parent process does a wait */ > #ifdef RTE_LIB_PDUMP > -- > 2.25.1 >