++ dev@dpdk.org
On Fri, Apr 17, 2020 at 10:38 PM Yangchao Zhou <zhouya...@gmail.com> wrote:
> Hi Vladimir,
>
> Thanks, you are right. I saw that the next hop is also in lpm table
> entries.
> On the basis of the same route, skiping the table entries update only if
> the next hop is also the same.
>
> On Fri, Apr 17, 2020 at 10:04 PM Medvedkin, Vladimir <
> vladimir.medved...@intel.com> wrote:
>
>> Hi Zhou,
>>
>> NACK.
>> This patch makes lpm inconsistent.
>> From the programmers guide
>> "If a rule with the same prefix is already present in the table, the next
>> hop of the rule is updated."
>> So, here in case of presence of a route, next hop will be updated only in
>> rules_table which is helper data struct, but won't be updated in lpm data
>> plane struct.
>>
>> -----Original Message-----
>> From: Yangchao Zhou <zhouya...@gmail.com>
>> Sent: Friday, April 17, 2020 2:49 PM
>> To: dev@dpdk.org
>> Cc: Richardson, Bruce <bruce.richard...@intel.com>; Medvedkin, Vladimir <
>> vladimir.medved...@intel.com>
>> Subject: [PATCH] lpm: skip table entries update if rules found
>>
>> Table entries do not need to be updated if the same rules can be found.
>>
>> Signed-off-by: Yangchao Zhou <zhouya...@gmail.com>
>> ---
>> lib/librte_lpm/rte_lpm.c | 6 +++++-
>> 1 file changed, 5 insertions(+), 1 deletion(-)
>>
>> diff --git a/lib/librte_lpm/rte_lpm.c b/lib/librte_lpm/rte_lpm.c index
>> 268756419..ee44fc4e5 100644
>> --- a/lib/librte_lpm/rte_lpm.c
>> +++ b/lib/librte_lpm/rte_lpm.c
>> @@ -287,7 +287,7 @@ rule_add(struct rte_lpm *lpm, uint32_t ip_masked,
>> uint8_t depth,
>> if (lpm->rules_tbl[rule_index].ip == ip_masked) {
>> lpm->rules_tbl[rule_index].next_hop =
>> next_hop;
>>
>> - return rule_index;
>> + return -EEXIST;
>> }
>> }
>>
>> @@ -674,6 +674,10 @@ rte_lpm_add(struct rte_lpm *lpm, uint32_t ip,
>> uint8_t depth,
>> /* Add the rule to the rule table. */
>> rule_index = rule_add(lpm, ip_masked, depth, next_hop);
>>
>> + /* Skip table entries update if rule is found in rule table */
>> + if (rule_index == -EEXIST)
>> + return 0;
>> +
>> /* If the is no space available for new rule return error. */
>> if (rule_index < 0) {
>> return rule_index;
>> --
>> 2.17.1
>>
>>
