On 28-Oct-2015, at 12:27 pm, Matthew Hall <mhall at mhcomputing.net> wrote:
>
> On Wed, Oct 28, 2015 at 12:20:22PM +0530, Padam Jeet Singh wrote:
>> Any hint what could I be doing wrong here?
>
> When this kind of stuff doesn't work it often will depend on the exact
> version
> of card, chip, etc. if there are any errata.
>
82599ES or ixgbe PMD has not had any bug fixes related to offload - not at
least what I can see in the git commits.
One important finding: Issue only comes when I do TX VLAN offload using
PKT_TX_VLAN_PKT (fill vlan tci, l2_len, l3_len with the VLAN ID, sizeof(struct
ether_hdr), sizeof(struct ipv4_hdr) respectively.
So basically VLAN OFFLOAD + IP CSUM OFFLOAD + TCP CSUM OFFLOAD causes the TCP
checksum to be computed wrong. VLAN Offload + IP CSUM Offload + TCP CSUM in
Software produces correct results. I am suspecting this to be ixgbe driver bug
now as nothing in my code can trigger this behaviour.
> So you might want to collect the specifics of the board with lspci -v,
> ethtool, and pulling it out to check the chip and board revisions.
02:00.0 Ethernet controller: Intel Corporation 82599ES 10-Gigabit SFI/SFP+
Network Connection (rev 01)
Flags: bus master, fast devsel, latency 0, IRQ 32
Memory at c7d20000 (64-bit, non-prefetchable) [size=128K]
Memory at c7d44000 (64-bit, non-prefetchable) [size=16K]
Capabilities: [40] Power Management version 3
Capabilities: [50] MSI: Enable- Count=1/1 Maskable+ 64bit+
Capabilities: [70] MSI-X: Enable+ Count=64 Masked-
Capabilities: [a0] Express Endpoint, MSI 00
Capabilities: [e0] Vital Product Data
Capabilities: [100] Advanced Error Reporting
Capabilities: [140] Device Serial Number 00-90-0b-ff-ff-3f-19-d0
Capabilities: [150] Alternative Routing-ID Interpretation (ARI)
Capabilities: [160] Single Root I/O Virtualization (SR-IOV)
Kernel driver in use: igb_uio
Kernel modules: ixgbe
>
> In addition check over the example apps and see how things work there
> compared
> with your own code. Often the DPDK interfaces are kind of complex and small
> pointer or mbuf manipulation mistakes can cause very odd results.
>
None of the sample code addresses the scenario which I have = VLAN offload + IP
+ TCP offload.
> Matthew.
Thanks,
Padam
