[dpdk-dev] [PATCH] table: fix table_array for incomplete bitmask

[dpdk-dev] [PATCH] table: fix table_array for incomplete bitmask

[Bruce Richardson]

Hi Cristian, please review before I send out publically. Thanks. B.
-------------------------

When a lookup was done on a table_array structure with an incomplete
bitmask, the results was always zero hits. This was because the
pkts_mask value was cleared as we process each entry, and the result
was assigned at the end of the loop, when pkts_mask was zero.
Changing the assignment to occur at the start, before the pkts_mask
gets cleared, fixes this issue.

Signed-off-by: Bruce Richardson <bruce.richardson@intel.com>
---
 lib/librte_table/rte_table_array.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/lib/librte_table/rte_table_array.c b/lib/librte_table/rte_table_array.c
index 0b1d42a..4d3c05e 100644
--- a/lib/librte_table/rte_table_array.c
+++ b/lib/librte_table/rte_table_array.c
@@ -164,6 +164,8 @@ rte_table_array_lookup(
 {
 	struct rte_table_array *t = (struct rte_table_array *) table;
 
+	*lookup_hit_mask = pkts_mask;
+
 	if ((pkts_mask & (pkts_mask + 1)) == 0) {
 		uint64_t n_pkts = __builtin_popcountll(pkts_mask);
 		uint32_t i;
@@ -190,8 +192,6 @@ rte_table_array_lookup(
 		}
 	}
 
-	*lookup_hit_mask = pkts_mask;
-
 	return 0;
 }
 
-- 
1.9.3

Re: [dpdk-dev] [PATCH] table: fix table_array for incomplete bitmask

[Bruce Richardson]

On Thu, Dec 04, 2014 at 02:23:33PM +0000, Bruce Richardson wrote:
> Hi Cristian, please review before I send out publically. Thanks. B.
> -------------------------
> 
> When a lookup was done on a table_array structure with an incomplete
> bitmask, the results was always zero hits. This was because the
> pkts_mask value was cleared as we process each entry, and the result
> was assigned at the end of the loop, when pkts_mask was zero.
> Changing the assignment to occur at the start, before the pkts_mask
> gets cleared, fixes this issue.
> 
> Signed-off-by: Bruce Richardson <bruce.richardson@intel.com>

Self-nak on this copy, please see follow-on without the review request to Cristian
(who can hopefully ack this soon :-) )

> ---
>  lib/librte_table/rte_table_array.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/lib/librte_table/rte_table_array.c b/lib/librte_table/rte_table_array.c
> index 0b1d42a..4d3c05e 100644
> --- a/lib/librte_table/rte_table_array.c
> +++ b/lib/librte_table/rte_table_array.c
> @@ -164,6 +164,8 @@ rte_table_array_lookup(
>  {
>  	struct rte_table_array *t = (struct rte_table_array *) table;
>  
> +	*lookup_hit_mask = pkts_mask;
> +
>  	if ((pkts_mask & (pkts_mask + 1)) == 0) {
>  		uint64_t n_pkts = __builtin_popcountll(pkts_mask);
>  		uint32_t i;
> @@ -190,8 +192,6 @@ rte_table_array_lookup(
>  		}
>  	}
>  
> -	*lookup_hit_mask = pkts_mask;
> -
>  	return 0;
>  }
>  
> -- 
> 1.9.3
> 

Re: [dpdk-dev] [PATCH] table: fix table_array for incomplete bitmask

[Thomas Monjalon]

> When a lookup was done on a table_array structure with an incomplete
> bitmask, the results was always zero hits. This was because the
> pkts_mask value was cleared as we process each entry, and the result
> was assigned at the end of the loop, when pkts_mask was zero.
> Changing the assignment to occur at the start, before the pkts_mask
> gets cleared, fixes this issue.
> 
> Signed-off-by: Bruce Richardson <bruce.richardson@intel.com>

> Acked by: <Cristian.Dumitrescu at intel.com>

Applied

Thanks
-- 
Thomas

Re: [dpdk-dev] [PATCH] table: fix table_array for incomplete bitmask

[Dumitrescu, Cristian]

Acked by: <Cristian.Dumitrescu at intel.com>

-----Original Message-----
From: dev [mailto:dev-bounces@dpdk.org] On Behalf Of Bruce Richardson
Sent: Thursday, December 4, 2014 2:24 PM
To: dev@dpdk.org
Subject: [dpdk-dev] [PATCH] table: fix table_array for incomplete bitmask

When a lookup was done on a table_array structure with an incomplete
bitmask, the results was always zero hits. This was because the
pkts_mask value was cleared as we process each entry, and the result
was assigned at the end of the loop, when pkts_mask was zero.
Changing the assignment to occur at the start, before the pkts_mask
gets cleared, fixes this issue.

Signed-off-by: Bruce Richardson <bruce.richardson@intel.com>
---
 lib/librte_table/rte_table_array.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/lib/librte_table/rte_table_array.c b/lib/librte_table/rte_table_array.c
index 0b1d42a..4d3c05e 100644
--- a/lib/librte_table/rte_table_array.c
+++ b/lib/librte_table/rte_table_array.c
@@ -164,6 +164,8 @@ rte_table_array_lookup(
 {
 	struct rte_table_array *t = (struct rte_table_array *) table;
 
+	*lookup_hit_mask = pkts_mask;
+
 	if ((pkts_mask & (pkts_mask + 1)) == 0) {
 		uint64_t n_pkts = __builtin_popcountll(pkts_mask);
 		uint32_t i;
@@ -190,8 +192,6 @@ rte_table_array_lookup(
 		}
 	}
 
-	*lookup_hit_mask = pkts_mask;
-
 	return 0;
 }
 
-- 
1.9.3

--------------------------------------------------------------
Intel Shannon Limited
Registered in Ireland
Registered Office: Collinstown Industrial Park, Leixlip, County Kildare
Registered Number: 308263
Business address: Dromore House, East Park, Shannon, Co. Clare

This e-mail and any attachments may contain confidential material for the sole use of the intended recipient(s). Any review or distribution by others is strictly prohibited. If you are not the intended recipient, please contact the sender and delete all copies.

[dpdk-dev] [PATCH] table: fix table_array for incomplete bitmask

[Bruce Richardson]

When a lookup was done on a table_array structure with an incomplete
bitmask, the results was always zero hits. This was because the
pkts_mask value was cleared as we process each entry, and the result
was assigned at the end of the loop, when pkts_mask was zero.
Changing the assignment to occur at the start, before the pkts_mask
gets cleared, fixes this issue.

Signed-off-by: Bruce Richardson <bruce.richardson@intel.com>
---
 lib/librte_table/rte_table_array.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/lib/librte_table/rte_table_array.c b/lib/librte_table/rte_table_array.c
index 0b1d42a..4d3c05e 100644
--- a/lib/librte_table/rte_table_array.c
+++ b/lib/librte_table/rte_table_array.c
@@ -164,6 +164,8 @@ rte_table_array_lookup(
 {
 	struct rte_table_array *t = (struct rte_table_array *) table;
 
+	*lookup_hit_mask = pkts_mask;
+
 	if ((pkts_mask & (pkts_mask + 1)) == 0) {
 		uint64_t n_pkts = __builtin_popcountll(pkts_mask);
 		uint32_t i;
@@ -190,8 +192,6 @@ rte_table_array_lookup(
 		}
 	}
 
-	*lookup_hit_mask = pkts_mask;
-
 	return 0;
 }
 
-- 
1.9.3