The testpmd failed to parse RSS queue rules on fedora30

  Hi,

After upgrading the Fedora29 to 30, then met the flow cmdline parse issue, like

testpmd> flow create 0 ingress pattern end actions rss queues 1 4 7 end / end
Bad arguments

After debug by adding bellow checking code:

pop_arg = 0x97b1c0, arg->offset = 4, arg->size = 2
push_arg = 0x7fffffff8080
pop_arg = 0x7fffffff8080, arg->offset = 5912737, arg->size = 0
RSS queue: <1> failed
Bad arguments

It indicates that queue number parsing failed. I wanted to dump the 'arg->offset'
in 'parse_vc_action_rss_queue' like:

static void dump_push_args(struct context *ctx)
{
        const struct arg *arg = pop_args(ctx);

        ctx->args_num++; /* recover */

        printf("push_arg = %p, arg->offset = %u, arg->size = %u\n", arg, arg->offset, arg->size);
}

or

static void dump_push_args(struct context *ctx)
{
	const struct arg *arg = (const struct arg *)ctx->args[ctx->args_num - 1];

	printf("push_arg = %p, arg->offset = %u, arg->size = %u\n", arg, arg->offset, arg->size);
}

Both of them failed to compile:

/root/dpdk/app/test-pmd/cmdline_flow.c: In function 'parse_vc_action_rss_queue':
/root/dpdk/app/test-pmd/cmdline_flow.c:3373:2: error: '<U6120>.size' may be used uninitialized in this function [-Werror=maybe-uninitialized]
 3373 |  printf("push_arg = %p, arg->offset = %u, arg->size = %u\n", arg, arg->offset, arg->size);
      |  ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/root/dpdk/app/test-pmd/cmdline_flow.c:3373:2: error: '<U6120>.offset' may be used uninitialized in this function [-Werror=maybe-uninitialized]
cc1: all warnings being treated as errors

So I only can dump the 'arg' pointer address, it looks OK, the same value, but the 'offset' and 'size' are wrong.

Does anyone suffer from this on fedora 30??

BR,
Haiyue
  

More information is provided:

Fedora30 GCC: 
gcc -v
Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/usr/libexec/gcc/x86_64-redhat-linux/9/lto-wrapper
OFFLOAD_TARGET_NAMES=nvptx-none
OFFLOAD_TARGET_DEFAULT=1
Target: x86_64-redhat-linux
Configured with: ../configure --enable-bootstrap --enable-languages=c,c++,fortran,objc,obj-c++,ada,go,d,lto --prefix=/usr --mandir=/usr/share/man --infodir=/usr/share/info --with-bugurl=http://bugzilla.redhat.com/bugzilla --enable-shared --enable-threads=posix --enable-checking=release --enable-multilib --with-system-zlib --enable-__cxa_atexit --disable-libunwind-exceptions --enable-gnu-unique-object --enable-linker-build-id --with-gcc-major-version-only --with-linker-hash-style=gnu --enable-plugin --enable-initfini-array --with-isl --enable-offload-targets=nvptx-none --without-cuda-driver --enable-gnu-indirect-function --enable-cet --with-tune=generic --with-arch_32=i686 --build=x86_64-redhat-linux
Thread model: posix
gcc version 9.1.1 20190503 (Red Hat 9.1.1-1) (GCC)

---

On Ubuntu 16.04, I can dump the arg's value like, no problem for compiling:

diff --git a/app/test-pmd/cmdline_flow.c b/app/test-pmd/cmdline_flow.c
index 201bd9d..cc1d41c 100644
--- a/app/test-pmd/cmdline_flow.c
+++ b/app/test-pmd/cmdline_flow.c
@@ -3378,6 +3378,7 @@ parse_vc_action_rss_queue(struct context *ctx, const struct token *token,
 {
        static const enum index next[] = NEXT_ENTRY(ACTION_RSS_QUEUE);
        struct action_rss_data *action_rss_data;
+       const struct arg *arg;
        int ret;
        int i;

@@ -3398,6 +3399,8 @@ parse_vc_action_rss_queue(struct context *ctx, const struct token *token,
                                     i * sizeof(action_rss_data->queue[i]),
                                     sizeof(action_rss_data->queue[i]))))
                return -1;
+       arg = (const struct arg *)ctx->args[ctx->args_num - 1];
+       printf("push_arg = %p, arg->offset = %u, arg->size = %u\n", arg, arg->offset, arg->size);
        ret = parse_int(ctx, token, str, len, NULL, 0);
        if (ret < 0) {
                pop_args(ctx);
@@ -4349,6 +4352,9 @@ parse_int(struct context *ctx, const struct token *token,
        /* Argument is expected. */
        if (!arg)
                return -1;
+
+       printf("pop_arg = %p, arg->offset = %u, arg->size = %u\n", arg, arg->offset, arg->size);
+

The output is as expected:

flow create 0 ingress pattern end actions rss queues 1 4 7 end / end
pop_arg = 0xa4de40, arg->offset = 4, arg->size = 2
push_arg = 0x7ffd83c3e6e0, arg->offset = 104, arg->size = 2
pop_arg = 0x7ffd83c3e6e0, arg->offset = 104, arg->size = 2
push_arg = 0x7ffd83c3e6e0, arg->offset = 106, arg->size = 2
pop_arg = 0x7ffd83c3e6e0, arg->offset = 106, arg->size = 2
push_arg = 0x7ffd83c3e6e0, arg->offset = 108, arg->size = 2
pop_arg = 0x7ffd83c3e6e0, arg->offset = 108, arg->size = 2
Flow rule #0 created

BR,
Haiyue


> -----Original Message-----
> From: dev [mailto:dev-bounces@dpdk.org] On Behalf Of Wang, Haiyue
> Sent: Tuesday, June 25, 2019 01:56
> To: dev@dpdk.org
> Subject: [dpdk-dev] The testpmd failed to parse RSS queue rules on fedora30
> 
> Hi,
> 
> After upgrading the Fedora29 to 30, then met the flow cmdline parse issue, like
> 
> testpmd> flow create 0 ingress pattern end actions rss queues 1 4 7 end / end
> Bad arguments
> 
> After debug by adding bellow checking code:
> 
> diff --git a/app/test-pmd/cmdline_flow.c b/app/test-pmd/cmdline_flow.c
> index 201bd9de5..ea387d2ff 100644
> --- a/app/test-pmd/cmdline_flow.c
> +++ b/app/test-pmd/cmdline_flow.c
> @@ -3398,8 +3398,10 @@ parse_vc_action_rss_queue(struct context *ctx, const struct token *token,
>                                      i * sizeof(action_rss_data->queue[i]),
>                                      sizeof(action_rss_data->queue[i]))))
>                 return -1;
> +       printf("push_arg = %p\n", ctx->args[ctx->args_num - 1]);
>         ret = parse_int(ctx, token, str, len, NULL, 0);
>         if (ret < 0) {
> +               printf("RSS queue: <%.*s> failed\n", len, str);
>                 pop_args(ctx);
>                 return -1;
>         }
> @@ -4349,6 +4351,10 @@ parse_int(struct context *ctx, const struct token *token,
>         /* Argument is expected. */
>         if (!arg)
>                 return -1;
> +
> +       printf("pop_arg = %p, arg->offset = %u, arg->size = %u\n",
> +              arg, arg->offset, arg->size);
> +
> 
> 
> The output is:
> pop_arg = 0x97b1c0, arg->offset = 4, arg->size = 2
> push_arg = 0x7fffffff8080
> pop_arg = 0x7fffffff8080, arg->offset = 5912737, arg->size = 0
> RSS queue: <1> failed
> Bad arguments
> 
> It indicates that queue number parsing failed. I wanted to dump the 'arg->offset'
> in 'parse_vc_action_rss_queue' like:
> 
> static void dump_push_args(struct context *ctx)
> {
>         const struct arg *arg = pop_args(ctx);
> 
>         ctx->args_num++; /* recover */
> 
>         printf("push_arg = %p, arg->offset = %u, arg->size = %u\n", arg, arg->offset, arg->size);
> }
> 
> or
> 
> static void dump_push_args(struct context *ctx)
> {
> 	const struct arg *arg = (const struct arg *)ctx->args[ctx->args_num - 1];
> 
> 	printf("push_arg = %p, arg->offset = %u, arg->size = %u\n", arg, arg->offset, arg->size);
> }
> 
> Both of them failed to compile:
> 
> /root/dpdk/app/test-pmd/cmdline_flow.c: In function 'parse_vc_action_rss_queue':
> /root/dpdk/app/test-pmd/cmdline_flow.c:3373:2: error: '<U6120>.size' may be used uninitialized in this
> function [-Werror=maybe-uninitialized]
>  3373 |  printf("push_arg = %p, arg->offset = %u, arg->size = %u\n", arg, arg->offset, arg->size);
>       |  ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> /root/dpdk/app/test-pmd/cmdline_flow.c:3373:2: error: '<U6120>.offset' may be used uninitialized in
> this function [-Werror=maybe-uninitialized]
> cc1: all warnings being treated as errors
> 
> So I only can dump the 'arg' pointer address, it looks OK, the same value, but the 'offset' and 'size'
> are wrong.
> 
> Does anyone suffer from this on fedora 30??
> 
> BR,
> Haiyue