Hi Stephen/Long,
Thanks for the suggestions. I configured the RSS key to be 40 bytes as
suggested.
What NDIS version is being used by netvsc and could you please direct me to
a microsoft document confirming that if TCP RSS is requested, UDP RSS is
implied?
Regards

On Wed, Sep 4, 2024 at 3:42 PM Stephen Hemminger <stephen@networkplumber.org>
wrote:

> On Tue, 3 Sep 2024 17:21:48 -0700
> Nandini Rangaswamy <nandini.rangaswamy@broadcom.com> wrote:
>
> > Hi Stephen/Long,
> > dpdk_netvsc_port_configure:1873 Configure port eth2/2. I am testing using
> > TCP traffic (iperf3 tool) generated between pair of client and servers
> with
> > DPDK app forward traffic between client and servers.
> > These are the config being passed for configuring netvsc:
> > lsc_intr=1
> > rxq/txq=2/2,
> > rss is enabled with rss_hf=0x0000000000000c30
> > tx_ol=0x00000000000006
> > rx_ol=0x00000000080007
> >
> > Rsskey len is 64.
> > struct rte_eth_conf conf = {
> > .intr_conf = {
> > .lsc = !dpdk.lsc_intr_disable && !dpdk_if->lsc_intr_disable &&
> > !!(dev->data->dev_flags & RTE_ETH_DEV_INTR_LSC),
> > },
> > .rxmode = {
> > .mq_mode = RTE_ETH_MQ_RX_RSS,
> > .offloads = RTE_ETH_RX_OFFLOAD_VLAN_STRIP |
> RTE_ETH_RX_OFFLOAD_IPV4_CKSUM |
> > RTE_ETH_RX_OFFLOAD_RSS_HASH | RTE_ETH_RX_OFFLOAD_UDP_CKSUM,
> > },
> > .rx_adv_conf.rss_conf = {
> > .rss_hf = RTE_ETH_RSS_NONFRAG_IPV4_UDP | RTE_ETH_RSS_NONFRAG_IPV4_TCP |
> > RTE_ETH_RSS_NONFRAG_IPV6_TCP,
> > .rss_key = conf_rss_key,
> > .rss_key_len = rss_key_len,
> > },
> > .txmode = {
> > .offloads = RTE_ETH_TX_OFFLOAD_UDP_CKSUM | RTE_ETH_TX_OFFLOAD_IPV4_CKSUM,
> > },
> >
> > Regards,
> > Nandini
> >
> > On Tue, Sep 3, 2024 at 5:03 PM Stephen Hemminger <
> stephen@networkplumber.org>
> > wrote:
> >
> > > On Tue, 3 Sep 2024 14:43:28 -0700
> > > Nandini Rangaswamy <nandini.rangaswamy@broadcom.com> wrote:
> > >
> > > > Hi Stephen and Long,
> > > > I was going through one of the netvsc patches
> > > > https://mails.dpdk.org/archives/dev/2018-August/110559.html which
> > > mentioned
> > > > that netvsc and failsafe give the same performance in VF path
> whereas for
> > > > some exception path  tests, about 22% performance gain in seen.
> > > > I ran some tests locally with my dpdk app integrated with netvsc PMD
> and
> > > > observed that netvsc does give nearly the same performance as
> failsafe in
> > > > the VF path.
> > > > Since the official document does not explicitly cite this, I would
> like
> > > to
> > > > confirm if this holds good.
> > > > Regards,
> > > > Nandini
> > > >
> > >
> > > Shouldn't be. What settings are you using.
> > > Both failsafe and netvsc just pass packets to VF if present.
> > > There is even more locks to go through with failsafe.
> > >
> > > Are you sure the test doesn't exercise something like checksumming
> which
> > > maybe different.
> > >
> >
>
> How many streams? RSS won't matter unless multiple streams.
> The netvsc driver does not have RSS for UDP as a listed flag.
> It turns out that for that version of NDIS, if you ask for TCP RSS, UDP
> RSS is implied.
>
> RSS Key must be 40 bytes (Toeplitz) not 64 bytes.
> Just use the default key (rss_key == NULL rss_key_len = 0) to be safe
>
> Check that packets are going to the VF. One way to do that is to look at
> xstats on both netvsc and mlx5 device.
>
>
>

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