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From: bugzilla@dpdk.org
To: dev@dpdk.org
Subject: [Bug 1125] i40e: Tx offload for outer UDP checksum is advertised but
 in fact unsupported
Date: Sat, 12 Nov 2022 12:15:24 +0000
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https://bugs.dpdk.org/show_bug.cgi?id=3D1125

            Bug ID: 1125
           Summary: i40e: Tx offload for outer UDP checksum is advertised
                    but in fact unsupported
           Product: DPDK
           Version: unspecified
          Hardware: All
                OS: All
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: ethdev
          Assignee: dev@dpdk.org
          Reporter: ivan.malov@oktetlabs.ru
  Target Milestone: ---

In the opensource ethdev verification suite [1], there is a test,
xmit/one_packet, which is tailored specifically for Tx offload checks. In t=
he
case of i40e, the test finds a bug in encap. TSO support.

As shown in [2], a VXLAN packet with TSO request is transmitted, and result=
ing
packets mismatch because of the wrong checksum in the outer UDP header (it =
is
the same as the one in the original superframe). However, since the test se=
es
capability bit TX_OFFLOAD_OUTER_UDP_CKSUM in device info, the checksum is
expected to be offloaded.

According to Intel(R) Ethernet Controller X710/ XXV710/XL710 Datasheet, sec=
tion
8.4.4.2, "Tunneling UDP headers and GRE header are not offloaded while the
X710/XXV710/XL710 leaves their checksum field as is". That means the i40e P=
MD
shall not advertise TX_OFFLOAD_OUTER_UDP_CKSUM capability via device info A=
PI.

[1] https://mails.dpdk.org/archives/dev/2022-October/251663.html
[2] https://ts-factory.io/bublik/v2/log/163204?focusId=3D165783&mode=3Dtree=
Andlog

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