Re: [dpdk-dev] [PATCH v5 1/3] ip_frag: ensure minimum v4 fragmentation length

[Aaron Conole <aconole@redhat.com>]

"Ananyev, Konstantin" <konstantin.ananyev@intel.com> writes:

>  
>> Do a formal parameter check of mtu length, as well as
>> checking the the various inputs for validity.  If any
>> aren't acceptable, we bail.
>> 
>> Acked-by: Lukasz Wojciechowski <l.wojciechow@partner.samsung.com>
>> Signed-off-by: Aaron Conole <aconole@redhat.com>
>> ---
>>  lib/librte_ip_frag/rte_ipv4_fragmentation.c | 9 +++++++++
>>  1 file changed, 9 insertions(+)
>> 
>> diff --git a/lib/librte_ip_frag/rte_ipv4_fragmentation.c b/lib/librte_ip_frag/rte_ipv4_fragmentation.c
>> index 9e9f986cc5..c36678a6d2 100644
>> --- a/lib/librte_ip_frag/rte_ipv4_fragmentation.c
>> +++ b/lib/librte_ip_frag/rte_ipv4_fragmentation.c
>> @@ -76,6 +76,15 @@ rte_ipv4_fragment_packet(struct rte_mbuf *pkt_in,
>>  	uint16_t fragment_offset, flag_offset, frag_size;
>>  	uint16_t frag_bytes_remaining;
>> 
>> +	/*
>> +	 * Formal parameter checking.
>> +	 */
>> +	if (unlikely(pkt_in == NULL) || unlikely(pkts_out == NULL) ||
>> +	    unlikely(nb_pkts_out == 0) ||
>> +	    unlikely(pool_direct == NULL) || unlikely(pool_indirect == NULL) ||
>> +	    unlikely(mtu_size < 68))
>
> It is better not to use hard-coded constant values.
> I think we have a macro for it at lib/librte_net/rte_ether.h:
> #define RTE_ETHER_MIN_MTU 68 /**< Minimum MTU for IPv4 packets, see RFC 791. */

Done.

> Apart from that:
> Acked-by: Konstantin Ananyev <konstantin.ananyev@intel.com>
>
>
>> +		return -EINVAL;
>> +
>>  	/*
>>  	 * Ensure the IP payload length of all fragments is aligned to a
>>  	 * multiple of 8 bytes as per RFC791 section 2.3.
>> --
>> 2.25.1