Re: [dpdk-dev] [dpdk-stable] [PATCH 1/4] net/tap: fix Rx cksum flags on IP options packets

[Andrew Rybchenko <andrew.rybchenko@oktetlabs.ru>]

On 4/30/21 5:48 PM, Ferruh Yigit wrote:
> On 4/27/2021 2:57 PM, Olivier Matz wrote:
>> When packet type is IPV4_EXT, the checksum is always marked as good in
>> the mbuf offload flags.
>>
>> Since we know the header lengths, we can easily call
>> rte_ipv4_udptcp_cksum() in this case too.
>>
>> Fixes: 8ae3023387e9 ("net/tap: add Rx/Tx checksum offload support")
>> Cc: stable@dpdk.org
>>
>> Signed-off-by: Olivier Matz <olivier.matz@6wind.com>
>> ---
>>  drivers/net/tap/rte_eth_tap.c | 4 ++--
>>  1 file changed, 2 insertions(+), 2 deletions(-)
>>
>> diff --git a/drivers/net/tap/rte_eth_tap.c b/drivers/net/tap/rte_eth_tap.c
>> index 68baa18523..e7b185a4b5 100644
>> --- a/drivers/net/tap/rte_eth_tap.c
>> +++ b/drivers/net/tap/rte_eth_tap.c
>> @@ -350,7 +350,7 @@ tap_verify_csum(struct rte_mbuf *mbuf)
>>  		/* Don't verify checksum for multi-segment packets. */
>>  		if (mbuf->nb_segs > 1)
>>  			return;
>> -		if (l3 == RTE_PTYPE_L3_IPV4) {
>> +		if (l3 == RTE_PTYPE_L3_IPV4 || l3 == RTE_PTYPE_L3_IPV4_EXT) {
> 
> Should we take 'RTE_PTYPE_L3_IPV4_EXT_UNKNOWN' into account?

I think we should.

> 
>>  			if (l4 == RTE_PTYPE_L4_UDP) {
>>  				udp_hdr = (struct rte_udp_hdr *)l4_hdr;
>>  				if (udp_hdr->dgram_cksum == 0) {
>> @@ -364,7 +364,7 @@ tap_verify_csum(struct rte_mbuf *mbuf)
>>  				}
>>  			}
>>  			cksum = ~rte_ipv4_udptcp_cksum(l3_hdr, l4_hdr);
>> -		} else if (l3 == RTE_PTYPE_L3_IPV6) {
>> +		} else { /* l3 == RTE_PTYPE_L3_IPV6, checked above */
>>  			cksum = ~rte_ipv6_udptcp_cksum(l3_hdr, l4_hdr);
>>  		}
>>  		mbuf->ol_flags |= cksum ?
>>