table: fix lookup with 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>
Acked by: Cristian Dumitrescu <cristian.dumitrescu@intel.com>

diff --git a/lib/librte_table/rte_table_array.c b/lib/librte_table/rte_table_array.c
index 0b1d42a..4d3c05e 100644 (file)
--- 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;
 }