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  3. [PATCH bpf V8 0/7] XDP-hints: API change for RX-hash kfunc bpf_xdp_metadata_rx_hash
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[PATCH bpf V8 2/7] selftests/bpf: Add counters to xdp_hw_metadata

Jesper Dangaard Brouer posted 7 patches 2 years, 10 months ago
There is a newer version of this series
[PATCH bpf V8 2/7] selftests/bpf: Add counters to xdp_hw_metadata
Posted by Jesper Dangaard Brouer 2 years, 10 months ago 
Add counters for skipped, failed and redirected packets.
The xdp_hw_metadata program only redirects UDP port 9091.
This helps users to quickly identify then packets are
skipped and identify failures of bpf_xdp_adjust_meta.

Signed-off-by: Jesper Dangaard Brouer <brouer@redhat.com>
---
 .../testing/selftests/bpf/progs/xdp_hw_metadata.c  |   15 +++++++++++++--
 tools/testing/selftests/bpf/xdp_hw_metadata.c      |    4 +++-
 2 files changed, 16 insertions(+), 3 deletions(-)

diff --git a/tools/testing/selftests/bpf/progs/xdp_hw_metadata.c b/tools/testing/selftests/bpf/progs/xdp_hw_metadata.c
index b0104763405a..a07ef7534013 100644
--- a/tools/testing/selftests/bpf/progs/xdp_hw_metadata.c
+++ b/tools/testing/selftests/bpf/progs/xdp_hw_metadata.c
@@ -25,6 +25,10 @@ struct {
 	__type(value, __u32);
 } xsk SEC(".maps");
 
+volatile __u64 pkts_skip = 0;
+volatile __u64 pkts_fail = 0;
+volatile __u64 pkts_redir = 0;
+
 extern int bpf_xdp_metadata_rx_timestamp(const struct xdp_md *ctx,
 					 __u64 *timestamp) __ksym;
 extern int bpf_xdp_metadata_rx_hash(const struct xdp_md *ctx,
@@ -59,16 +63,21 @@ int rx(struct xdp_md *ctx)
 			udp = NULL;
 	}
 
-	if (!udp)
+	if (!udp) {
+		pkts_skip++;
 		return XDP_PASS;
+	}
 
 	/* Forwarding UDP:9091 to AF_XDP */
-	if (udp->dest != bpf_htons(9091))
+	if (udp->dest != bpf_htons(9091)) {
+		pkts_skip++;
 		return XDP_PASS;
+	}
 
 	ret = bpf_xdp_adjust_meta(ctx, -(int)sizeof(struct xdp_meta));
 	if (ret != 0) {
 		bpf_printk("bpf_xdp_adjust_meta returned %d", ret);
+		pkts_fail++;
 		return XDP_PASS;
 	}
 
@@ -78,6 +87,7 @@ int rx(struct xdp_md *ctx)
 
 	if (meta + 1 > data) {
 		bpf_printk("bpf_xdp_adjust_meta doesn't appear to work");
+		pkts_fail++;
 		return XDP_PASS;
 	}
 
@@ -91,6 +101,7 @@ int rx(struct xdp_md *ctx)
 	else
 		meta->rx_hash = 0; /* Used by AF_XDP as not avail signal */
 
+	pkts_redir++;
 	return bpf_redirect_map(&xsk, ctx->rx_queue_index, XDP_PASS);
 }
 
diff --git a/tools/testing/selftests/bpf/xdp_hw_metadata.c b/tools/testing/selftests/bpf/xdp_hw_metadata.c
index 1c8acb68b977..3b942ef7297b 100644
--- a/tools/testing/selftests/bpf/xdp_hw_metadata.c
+++ b/tools/testing/selftests/bpf/xdp_hw_metadata.c
@@ -212,7 +212,9 @@ static int verify_metadata(struct xsk *rx_xsk, int rxq, int server_fd)
 	while (true) {
 		errno = 0;
 		ret = poll(fds, rxq + 1, 1000);
-		printf("poll: %d (%d)\n", ret, errno);
+		printf("poll: %d (%d) skip=%llu fail=%llu redir=%llu\n",
+		       ret, errno, bpf_obj->bss->pkts_skip,
+		       bpf_obj->bss->pkts_fail, bpf_obj->bss->pkts_redir);
 		if (ret < 0)
 			break;
 		if (ret == 0)
Re: [PATCH bpf V8 2/7] selftests/bpf: Add counters to xdp_hw_metadata
Posted by Stanislav Fomichev 2 years, 10 months ago 
On 04/12, Jesper Dangaard Brouer wrote:
> Add counters for skipped, failed and redirected packets.
> The xdp_hw_metadata program only redirects UDP port 9091.
> This helps users to quickly identify then packets are
> skipped and identify failures of bpf_xdp_adjust_meta.
> 
> Signed-off-by: Jesper Dangaard Brouer <brouer@redhat.com>
> ---
>  .../testing/selftests/bpf/progs/xdp_hw_metadata.c  |   15 +++++++++++++--
>  tools/testing/selftests/bpf/xdp_hw_metadata.c      |    4 +++-
>  2 files changed, 16 insertions(+), 3 deletions(-)
> 
> diff --git a/tools/testing/selftests/bpf/progs/xdp_hw_metadata.c b/tools/testing/selftests/bpf/progs/xdp_hw_metadata.c
> index b0104763405a..a07ef7534013 100644
> --- a/tools/testing/selftests/bpf/progs/xdp_hw_metadata.c
> +++ b/tools/testing/selftests/bpf/progs/xdp_hw_metadata.c
> @@ -25,6 +25,10 @@ struct {
>  	__type(value, __u32);
>  } xsk SEC(".maps");
>  
> +volatile __u64 pkts_skip = 0;
> +volatile __u64 pkts_fail = 0;
> +volatile __u64 pkts_redir = 0;
> +
>  extern int bpf_xdp_metadata_rx_timestamp(const struct xdp_md *ctx,
>  					 __u64 *timestamp) __ksym;
>  extern int bpf_xdp_metadata_rx_hash(const struct xdp_md *ctx,
> @@ -59,16 +63,21 @@ int rx(struct xdp_md *ctx)
>  			udp = NULL;
>  	}
>  
> -	if (!udp)
> +	if (!udp) {
> +		pkts_skip++;
>  		return XDP_PASS;
> +	}
>  
>  	/* Forwarding UDP:9091 to AF_XDP */
> -	if (udp->dest != bpf_htons(9091))
> +	if (udp->dest != bpf_htons(9091)) {
> +		pkts_skip++;
>  		return XDP_PASS;
> +	}
>  
>  	ret = bpf_xdp_adjust_meta(ctx, -(int)sizeof(struct xdp_meta));
>  	if (ret != 0) {

[..]

>  		bpf_printk("bpf_xdp_adjust_meta returned %d", ret);

Maybe let's remove these completely? Merge patch 1 and 2, remove printk,
add counters. We can add more counters in the future if the existing
ones are not enough.. WDYT?

> +		pkts_fail++;
>  		return XDP_PASS;
>  	}
>  
> @@ -78,6 +87,7 @@ int rx(struct xdp_md *ctx)
>  
>  	if (meta + 1 > data) {
>  		bpf_printk("bpf_xdp_adjust_meta doesn't appear to work");
> +		pkts_fail++;
>  		return XDP_PASS;
>  	}
>  
> @@ -91,6 +101,7 @@ int rx(struct xdp_md *ctx)
>  	else
>  		meta->rx_hash = 0; /* Used by AF_XDP as not avail signal */
>  
> +	pkts_redir++;
>  	return bpf_redirect_map(&xsk, ctx->rx_queue_index, XDP_PASS);
>  }
>  
> diff --git a/tools/testing/selftests/bpf/xdp_hw_metadata.c b/tools/testing/selftests/bpf/xdp_hw_metadata.c
> index 1c8acb68b977..3b942ef7297b 100644
> --- a/tools/testing/selftests/bpf/xdp_hw_metadata.c
> +++ b/tools/testing/selftests/bpf/xdp_hw_metadata.c
> @@ -212,7 +212,9 @@ static int verify_metadata(struct xsk *rx_xsk, int rxq, int server_fd)
>  	while (true) {
>  		errno = 0;
>  		ret = poll(fds, rxq + 1, 1000);
> -		printf("poll: %d (%d)\n", ret, errno);
> +		printf("poll: %d (%d) skip=%llu fail=%llu redir=%llu\n",
> +		       ret, errno, bpf_obj->bss->pkts_skip,
> +		       bpf_obj->bss->pkts_fail, bpf_obj->bss->pkts_redir);
>  		if (ret < 0)
>  			break;
>  		if (ret == 0)
> 
>
Re: [PATCH bpf V8 2/7] selftests/bpf: Add counters to xdp_hw_metadata
Posted by Jesper Dangaard Brouer 2 years, 10 months ago 
On 12/04/2023 18.56, Stanislav Fomichev wrote:
> On 04/12, Jesper Dangaard Brouer wrote:
>> Add counters for skipped, failed and redirected packets.
>> The xdp_hw_metadata program only redirects UDP port 9091.
>> This helps users to quickly identify then packets are
>> skipped and identify failures of bpf_xdp_adjust_meta.
>>
>> Signed-off-by: Jesper Dangaard Brouer <brouer@redhat.com>
>> ---
>>   .../testing/selftests/bpf/progs/xdp_hw_metadata.c  |   15 +++++++++++++--
>>   tools/testing/selftests/bpf/xdp_hw_metadata.c      |    4 +++-
>>   2 files changed, 16 insertions(+), 3 deletions(-)
>>
>> diff --git a/tools/testing/selftests/bpf/progs/xdp_hw_metadata.c b/tools/testing/selftests/bpf/progs/xdp_hw_metadata.c
>> index b0104763405a..a07ef7534013 100644
>> --- a/tools/testing/selftests/bpf/progs/xdp_hw_metadata.c
>> +++ b/tools/testing/selftests/bpf/progs/xdp_hw_metadata.c
>> @@ -25,6 +25,10 @@ struct {
>>   	__type(value, __u32);
>>   } xsk SEC(".maps");
>>   
>> +volatile __u64 pkts_skip = 0;
>> +volatile __u64 pkts_fail = 0;
>> +volatile __u64 pkts_redir = 0;
>> +
>>   extern int bpf_xdp_metadata_rx_timestamp(const struct xdp_md *ctx,
>>   					 __u64 *timestamp) __ksym;
>>   extern int bpf_xdp_metadata_rx_hash(const struct xdp_md *ctx,
>> @@ -59,16 +63,21 @@ int rx(struct xdp_md *ctx)
>>   			udp = NULL;
>>   	}
>>   
>> -	if (!udp)
>> +	if (!udp) {
>> +		pkts_skip++;
>>   		return XDP_PASS;
>> +	}
>>   
>>   	/* Forwarding UDP:9091 to AF_XDP */
>> -	if (udp->dest != bpf_htons(9091))
>> +	if (udp->dest != bpf_htons(9091)) {
>> +		pkts_skip++;
>>   		return XDP_PASS;
>> +	}
>>   
>>   	ret = bpf_xdp_adjust_meta(ctx, -(int)sizeof(struct xdp_meta));
>>   	if (ret != 0) {
> 
> [..]
> 
>>   		bpf_printk("bpf_xdp_adjust_meta returned %d", ret);
> 
> Maybe let's remove these completely? Merge patch 1 and 2, remove printk,
> add counters. We can add more counters in the future if the existing
> ones are not enough.. WDYT?
> 

Sure, lets just remove all of the bpf_printk, and add these counter instead.
Rolling V9.

>> +		pkts_fail++;

This fail counter should be enough for driver devel to realize that they
also need to implement/setup XDP metadata pointers correctly (for
bpf_xdp_adjust_meta to work).

>>   		return XDP_PASS;
>>   	}
Re: [PATCH bpf V8 2/7] selftests/bpf: Add counters to xdp_hw_metadata
Posted by Stanislav Fomichev 2 years, 10 months ago 
On Wed, Apr 12, 2023 at 10:52 AM Jesper Dangaard Brouer
<jbrouer@redhat.com> wrote:
>
>
> On 12/04/2023 18.56, Stanislav Fomichev wrote:
> > On 04/12, Jesper Dangaard Brouer wrote:
> >> Add counters for skipped, failed and redirected packets.
> >> The xdp_hw_metadata program only redirects UDP port 9091.
> >> This helps users to quickly identify then packets are
> >> skipped and identify failures of bpf_xdp_adjust_meta.
> >>
> >> Signed-off-by: Jesper Dangaard Brouer <brouer@redhat.com>
> >> ---
> >>   .../testing/selftests/bpf/progs/xdp_hw_metadata.c  |   15 +++++++++++++--
> >>   tools/testing/selftests/bpf/xdp_hw_metadata.c      |    4 +++-
> >>   2 files changed, 16 insertions(+), 3 deletions(-)
> >>
> >> diff --git a/tools/testing/selftests/bpf/progs/xdp_hw_metadata.c b/tools/testing/selftests/bpf/progs/xdp_hw_metadata.c
> >> index b0104763405a..a07ef7534013 100644
> >> --- a/tools/testing/selftests/bpf/progs/xdp_hw_metadata.c
> >> +++ b/tools/testing/selftests/bpf/progs/xdp_hw_metadata.c
> >> @@ -25,6 +25,10 @@ struct {
> >>      __type(value, __u32);
> >>   } xsk SEC(".maps");
> >>
> >> +volatile __u64 pkts_skip = 0;
> >> +volatile __u64 pkts_fail = 0;
> >> +volatile __u64 pkts_redir = 0;
> >> +
> >>   extern int bpf_xdp_metadata_rx_timestamp(const struct xdp_md *ctx,
> >>                                       __u64 *timestamp) __ksym;
> >>   extern int bpf_xdp_metadata_rx_hash(const struct xdp_md *ctx,
> >> @@ -59,16 +63,21 @@ int rx(struct xdp_md *ctx)
> >>                      udp = NULL;
> >>      }
> >>
> >> -    if (!udp)
> >> +    if (!udp) {
> >> +            pkts_skip++;
> >>              return XDP_PASS;
> >> +    }
> >>
> >>      /* Forwarding UDP:9091 to AF_XDP */
> >> -    if (udp->dest != bpf_htons(9091))
> >> +    if (udp->dest != bpf_htons(9091)) {
> >> +            pkts_skip++;
> >>              return XDP_PASS;
> >> +    }
> >>
> >>      ret = bpf_xdp_adjust_meta(ctx, -(int)sizeof(struct xdp_meta));
> >>      if (ret != 0) {
> >
> > [..]
> >
> >>              bpf_printk("bpf_xdp_adjust_meta returned %d", ret);
> >
> > Maybe let's remove these completely? Merge patch 1 and 2, remove printk,
> > add counters. We can add more counters in the future if the existing
> > ones are not enough.. WDYT?
> >
>
> Sure, lets just remove all of the bpf_printk, and add these counter instead.
> Rolling V9.
>
> >> +            pkts_fail++;
>
> This fail counter should be enough for driver devel to realize that they
> also need to implement/setup XDP metadata pointers correctly (for
> bpf_xdp_adjust_meta to work).

Agreed. As long as we have a clear signal "something's not working"
(instead of failing silently), that should be enough to get to the
bottom of it..

> >>              return XDP_PASS;
> >>      }
>

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