[dpdk-dev] [Bug 92] i40e RX capabilities include scatter/gather on VF, but not on PF

[bugzilla at dpdk.org]

https://bugs.dpdk.org/show_bug.cgi?id=92

            Bug ID: 92
           Summary: i40e RX capabilities include scatter/gather on VF, but
                    not on PF
           Product: DPDK
           Version: 18.08
          Hardware: All
                OS: All
            Status: CONFIRMED
          Severity: normal
          Priority: Normal
         Component: ethdev
          Assignee: dev at dpdk.org
          Reporter: mgsmith at netgate.com
  Target Milestone: ---

In file drivers/net/i40e/i40e_ethdev.c, function i40e_dev_info_get(), the list
of RX capabilities advertised in dev_info->rx_offload_capa does not include
DEV_RX_OFFLOAD_SCATTER.

The DEV_RX_OFFLOAD_SCATTER flag is advertised as a capability for an i40e VF in
file drivers/net/i40e/i40e_ethdev_vf.c, function i40evf_dev_info_get().

The documentation at https://doc.dpdk.org/guides/nics/i40e.html lists
"Scattered and gather for TX and RX" as a feature of the PMD.

Since the documentation lists it as supported and the VF supports it, it seems
like the omission of this flag in the PF RX capabilities may have been a
mistake. If it is actually intentional, perhaps the documentation can be
clarified to indicate that scatter/gather is only supported on the VF.

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