On 6/8/21 3:29 PM, Olivier Matz wrote:
> Hi Ferruh, Andrew,
>
> On Tue, Jun 08, 2021 at 01:13:59PM +0300, Andrew Rybchenko wrote:
>> 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: sta...@dpdk.org
>>>>
>>>> Signed-off-by: Olivier Matz <olivier.m...@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.
>
> I think 'RTE_PTYPE_L3_IPV4_EXT_UNKNOWN' cannot happen here:
>
> - mbuf->packet_type is generated by
(), which cannot
> return 'RTE_PTYPE_L3_IPV4_EXT_UNKNOWN'
My question if it is guaranteed and the only possible branch.
Can application set packet_type itself and do not call
rte_net_get_ptype(). Yes, typically application knows
if it has IPv4 options in the header or not, but theoretically
could be unaware as well.
> - right above this code, we already returned if l3 is not in
> (RTE_PTYPE_L3_IPV4, RTE_PTYPE_L3_IPV4_EXT, RTE_PTYPE_L3_IPV6)
If so, it sounds like it should be allowed above as well.
>
>>>
>>>> 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 ?
>>>>
>>
