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From: Nandini Rangaswamy <nandini.rangaswamy@broadcom.com>
Date: Mon, 16 Sep 2024 15:58:21 -0700
Message-ID: <CAAkQrK-WAQHnZ0L5KO1PZdRqapoQ9voWpNbZuOFihwG3jaYVnw@mail.gmail.com>
Subject: Re: Netvsc vs Failsafe Performance
To: Long Li <longli@microsoft.com>
Cc: Stephen Hemminger <stephen@networkplumber.org>,
 "users@dpdk.org" <users@dpdk.org>
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--0000000000002053460622448388
Content-Type: text/plain; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

Hi Long,
I tested this patch and it works as expected. The UDP IPv6 RSS offload bit
is set and my dpdk app is able to successfully configure the netvsc port.
Regards,
Nandini

On Fri, Sep 13, 2024 at 2:29=E2=80=AFPM Nandini Rangaswamy <
nandini.rangaswamy@broadcom.com> wrote:

> Thanks Long Li.
> I shall try this patch and get back to you.
>
> On Fri, Sep 13, 2024 at 2:27=E2=80=AFPM Long Li <longli@microsoft.com> wr=
ote:
>
>> It=E2=80=99s a bug in netvsc for not reporting RTE_ETH_RSS_NONFRAG_IPV6_=
UDP. It
>> is implied as in the case in IPV4.
>>
>>
>>
>> Can you try the following patch?
>>
>>
>>
>> diff --git a/drivers/net/netvsc/hn_rndis.c b/drivers/net/netvsc/hn_rndis=
.c
>>
>> index 1ba75ee804..fe1f04d8d9 100644
>>
>> --- a/drivers/net/netvsc/hn_rndis.c
>>
>> +++ b/drivers/net/netvsc/hn_rndis.c
>>
>> @@ -717,6 +717,7 @@ hn_rndis_query_rsscaps(struct hn_data *hv,
>>
>>         if (caps.ndis_caps & NDIS_RSS_CAP_IPV6)
>>
>>                 hv->rss_offloads |=3D RTE_ETH_RSS_IPV6
>>
>>                         | RTE_ETH_RSS_NONFRAG_IPV6_TCP;
>>
>> +                       | RTE_ETH_RSS_NONFRAG_IPV6_UDP;
>>
>>         if (caps.ndis_caps & NDIS_RSS_CAP_IPV6_EX)
>>
>>                 hv->rss_offloads |=3D RTE_ETH_RSS_IPV6_EX
>>
>>                         | RTE_ETH_RSS_IPV6_TCP_EX;
>>
>>
>>
>>
>>
>> *From:* Nandini Rangaswamy <nandini.rangaswamy@broadcom.com>
>> *Sent:* Friday, September 13, 2024 10:56 AM
>> *To:* Stephen Hemminger <stephen@networkplumber.org>
>> *Cc:* Long Li <longli@microsoft.com>; users@dpdk.org
>> *Subject:* Re: Netvsc vs Failsafe Performance
>>
>>
>>
>> Thanks for clarifying the question regarding Txd size Stephen.
>>
>> I tested out the RSS for TCP UDP.
>>
>> As suggested , I set the TCP flags alone in RSS conf and configured the
>> netvsc port.
>>
>>
>>
>> struct rte_eth_conf conf =3D {
>>
>> .intr_conf =3D {
>>
>> .lsc =3D !dpdk.lsc_intr_disable && !dpdk_if->lsc_intr_disable &&
>>
>> !!(dev->data->dev_flags & RTE_ETH_DEV_INTR_LSC),
>>
>> },
>>
>> .rxmode =3D {
>>
>> .mq_mode =3D RTE_ETH_MQ_RX_RSS,
>>
>> .offloads =3D 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 =3D {
>>
>> .rss_hf =3D RTE_ETH_RSS_NONFRAG_IPV4_TCP | RTE_ETH_RSS_NONFRAG_IPV6_TCP,
>>
>> .rss_key =3D conf_rss_key,
>>
>> .rss_key_len =3D rss_key_len,
>>
>> },
>>
>> .txmode =3D {
>>
>> .offloads =3D RTE_ETH_TX_OFFLOAD_UDP_CKSUM | RTE_ETH_TX_OFFLOAD_IPV4_CKS=
UM,
>>
>> },
>>
>> };
>>
>> *rte_eth_dev_configure*(<netvsc port>, num_rxq,num_txq, &conf);
>>
>> uint8_t rss_key_temp[64];
>>
>> struct rte_eth_rss_conf rss_conf =3D {
>>
>> .rss_key =3D rss_key_temp,
>>
>> .rss_key_len =3D sizeof(rss_key_temp),
>>
>> };
>>
>> ret =3D *rte_eth_dev_rss_hash_conf_get*(<VF port>, &rss_conf);
>>
>>
>>
>>
>>
>> Now the VF port RSS offloads show only TCP flags set and not UDP. I
>> assumed that even the UDP flags might be set. Is this expected ?
>>
>>
>>
>> Regards,
>>
>> Nandini
>>
>>
>>
>>
>>
>> On Thu, Sep 12, 2024 at 4:09=E2=80=AFPM Stephen Hemminger <
>> stephen@networkplumber.org> wrote:
>>
>> On Thu, 12 Sep 2024 13:47:37 -0700
>> Nandini Rangaswamy <nandini.rangaswamy@broadcom.com> wrote:
>>
>> > Thanks for your response Long Li.
>> > I see with netvsc the maximum number of Tx descriptors is restricted t=
o
>> > 4096 whereas the number of Rx descriptors is restricted to 8192.
>> > But, for failsafe PMD , we see that both the number of Txd and Rxd is
>> > restricted to 8192.
>> > How is netvsc PMD giving the same performance as failsafe PMD ?
>> >
>> > Regards
>>
>> I think the limits there were somewhat arbitrary chose with netvsc.
>> Don't remember a hard reason that would block larger sizes.
>>
>>
>> Having really big rings won't help performance (i.e BufferBloat) and
>> could a lot of memory consumption. When all heavy data traffic goes
>> through
>> the VF and that ring is different. Only DoS attacks should be impacted
>> by rx/tx descriptor limits in the netvsc device. The linux driver actual=
ly
>> has much smaller buffer.
>>
>>
>> This electronic communication and the information and any files
>> transmitted with it, or attached to it, are confidential and are intende=
d
>> solely for the use of the individual or entity to whom it is addressed a=
nd
>> may contain information that is confidential, legally privileged, protec=
ted
>> by privacy laws, or otherwise restricted from disclosure to anyone else.=
 If
>> you are not the intended recipient or the person responsible for deliver=
ing
>> the e-mail to the intended recipient, you are hereby notified that any u=
se,
>> copying, distributing, dissemination, forwarding, printing, or copying o=
f
>> this e-mail is strictly prohibited. If you received this e-mail in error=
,
>> please return the e-mail to the sender, delete it from your computer, an=
d
>> destroy any printed copy of it.
>>
>

--=20
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=20
with it, or attached to it, are confidential and are intended solely for=20
the use of the individual or entity to whom it is addressed and may contain=
=20
information that is confidential, legally privileged, protected by privacy=
=20
laws, or otherwise restricted from disclosure to anyone else. If you are=20
not the intended recipient or the person responsible for delivering the=20
e-mail to the intended recipient, you are hereby notified that any use,=20
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--0000000000002053460622448388
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr">Hi=C2=A0Long,<div>I tested this patch and it works as expe=
cted. The UDP IPv6 RSS offload bit is set and my dpdk app is able to succes=
sfully configure the netvsc port.</div><div>Regards,</div><div>Nandini</div=
></div><br><div class=3D"gmail_quote"><div dir=3D"ltr" class=3D"gmail_attr"=
>On Fri, Sep 13, 2024 at 2:29=E2=80=AFPM Nandini Rangaswamy &lt;<a href=3D"=
mailto:nandini.rangaswamy@broadcom.com">nandini.rangaswamy@broadcom.com</a>=
&gt; wrote:<br></div><blockquote class=3D"gmail_quote" style=3D"margin:0px =
0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div=
 dir=3D"ltr">Thanks Long Li.<div>I shall try this patch and get back to you=
.</div></div><br><div class=3D"gmail_quote"><div dir=3D"ltr" class=3D"gmail=
_attr">On Fri, Sep 13, 2024 at 2:27=E2=80=AFPM Long Li &lt;<a href=3D"mailt=
o:longli@microsoft.com" target=3D"_blank">longli@microsoft.com</a>&gt; wrot=
e:<br></div><blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0=
.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div>





<div lang=3D"EN-US">
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt">It=E2=80=99s a bug in=
 netvsc for not reporting RTE_ETH_RSS_NONFRAG_IPV6_UDP. It is implied as in=
 the case in IPV4.<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt"><u></u>=C2=A0<u></u><=
/span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt">Can you try the follo=
wing patch?<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt"><u></u>=C2=A0<u></u><=
/span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt">diff --git a/drivers/=
net/netvsc/hn_rndis.c b/drivers/net/netvsc/hn_rndis.c<u></u><u></u></span><=
/p>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt">index 1ba75ee804..fe1=
f04d8d9 100644<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt">--- a/drivers/net/net=
vsc/hn_rndis.c<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt">+++ b/drivers/net/net=
vsc/hn_rndis.c<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt">@@ -717,6 +717,7 @@ h=
n_rndis_query_rsscaps(struct hn_data *hv,<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt">=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0 if (caps.ndis_caps &amp; NDIS_RSS_CAP_IPV6)<u></u><u>=
</u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt">=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 hv-&g=
t;rss_offloads |=3D RTE_ETH_RSS_IPV6<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt">=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 | RTE_ETH_RSS_NONFRAG_IPV6_TCP;<=
u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt">+=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 | RTE_ETH_RSS_NONFRAG_IPV6_UDP;<u><=
/u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt">=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0 if (caps.ndis_caps &amp; NDIS_RSS_CAP_IPV6_EX)<u></u>=
<u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt">=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 hv-&g=
t;rss_offloads |=3D RTE_ETH_RSS_IPV6_EX<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt">=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 | RTE_ETH_RSS_IPV6_TCP_EX;<u></u=
><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt"><u></u>=C2=A0<u></u><=
/span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt"><u></u>=C2=A0<u></u><=
/span></p>
<div style=3D"border-top:none;border-right:none;border-bottom:none;border-l=
eft:1.5pt solid blue;padding:0in 0in 0in 4pt">
<div>
<div style=3D"border-right:none;border-bottom:none;border-left:none;border-=
top:1pt solid rgb(225,225,225);padding:3pt 0in 0in">
<p class=3D"MsoNormal"><b><span style=3D"font-size:11pt;font-family:Calibri=
,sans-serif">From:</span></b><span style=3D"font-size:11pt;font-family:Cali=
bri,sans-serif"> Nandini Rangaswamy &lt;<a href=3D"mailto:nandini.rangaswam=
y@broadcom.com" target=3D"_blank">nandini.rangaswamy@broadcom.com</a>&gt;
<br>
<b>Sent:</b> Friday, September 13, 2024 10:56 AM<br>
<b>To:</b> Stephen Hemminger &lt;<a href=3D"mailto:stephen@networkplumber.o=
rg" target=3D"_blank">stephen@networkplumber.org</a>&gt;<br>
<b>Cc:</b> Long Li &lt;<a href=3D"mailto:longli@microsoft.com" target=3D"_b=
lank">longli@microsoft.com</a>&gt;; <a href=3D"mailto:users@dpdk.org" targe=
t=3D"_blank">users@dpdk.org</a><br>
<b>Subject:</b> Re: Netvsc vs Failsafe Performance<u></u><u></u></span></p>
</div>
</div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<div>
<div>
<p class=3D"MsoNormal">Thanks for clarifying the question=C2=A0regarding Tx=
d size Stephen.<u></u><u></u></p>
<div>
<p class=3D"MsoNormal">I tested out the RSS for TCP UDP.<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal">As suggested , I set the TCP flags alone in RSS conf=
 and configured the netvsc port.<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
</div>
<div>
<div>
<div>
<p class=3D"MsoNormal" style=3D"line-height:13.5pt;background:whitesmoke"><=
span style=3D"font-size:9pt;font-family:&quot;Courier New&quot;;color:rgb(1=
22,62,157)">struct</span><span style=3D"font-size:9pt;font-family:&quot;Cou=
rier New&quot;;color:rgb(51,51,51)"> rte_eth_conf conf
</span><span style=3D"font-size:9pt;font-family:&quot;Courier New&quot;;col=
or:rgb(119,119,119)">=3D</span><span style=3D"font-size:9pt;font-family:&qu=
ot;Courier New&quot;;color:rgb(51,51,51)">
</span><span style=3D"font-size:9pt;font-family:&quot;Courier New&quot;;col=
or:rgb(119,119,119)">{</span><span style=3D"font-size:9pt;font-family:&quot=
;Courier New&quot;;color:rgb(51,51,51)"><u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"line-height:13.5pt;background:whitesmoke"><=
span style=3D"font-size:9pt;font-family:&quot;Courier New&quot;;color:rgb(5=
1,51,51)">.intr_conf
</span><span style=3D"font-size:9pt;font-family:&quot;Courier New&quot;;col=
or:rgb(119,119,119)">=3D</span><span style=3D"font-size:9pt;font-family:&qu=
ot;Courier New&quot;;color:rgb(51,51,51)">
</span><span style=3D"font-size:9pt;font-family:&quot;Courier New&quot;;col=
or:rgb(119,119,119)">{</span><span style=3D"font-size:9pt;font-family:&quot=
;Courier New&quot;;color:rgb(51,51,51)"><u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"line-height:13.5pt;background:whitesmoke"><=
span style=3D"font-size:9pt;font-family:&quot;Courier New&quot;;color:rgb(5=
1,51,51)">.lsc
</span><span style=3D"font-size:9pt;font-family:&quot;Courier New&quot;;col=
or:rgb(119,119,119)">=3D</span><span style=3D"font-size:9pt;font-family:&qu=
ot;Courier New&quot;;color:rgb(51,51,51)">
</span><span style=3D"font-size:9pt;font-family:&quot;Courier New&quot;;col=
or:rgb(119,119,119)">!</span><span style=3D"font-size:9pt;font-family:&quot=
;Courier New&quot;;color:rgb(122,62,157)">dpdk</span><span style=3D"font-si=
ze:9pt;font-family:&quot;Courier New&quot;;color:rgb(119,119,119)">.</span>=
<span style=3D"font-size:9pt;font-family:&quot;Courier New&quot;;color:rgb(=
122,62,157)">lsc_intr_disable</span><span style=3D"font-size:9pt;font-famil=
y:&quot;Courier New&quot;;color:rgb(51,51,51)">
</span><span style=3D"font-size:9pt;font-family:&quot;Courier New&quot;;col=
or:rgb(119,119,119)">&amp;&amp;</span><span style=3D"font-size:9pt;font-fam=
ily:&quot;Courier New&quot;;color:rgb(51,51,51)">
</span><span style=3D"font-size:9pt;font-family:&quot;Courier New&quot;;col=
or:rgb(119,119,119)">!</span><span style=3D"font-size:9pt;font-family:&quot=
;Courier New&quot;;color:rgb(122,62,157)">dpdk_if</span><span style=3D"font=
-size:9pt;font-family:&quot;Courier New&quot;;color:rgb(119,119,119)">-&gt;=
</span><span style=3D"font-size:9pt;font-family:&quot;Courier New&quot;;col=
or:rgb(122,62,157)">lsc_intr_disable</span><span style=3D"font-size:9pt;fon=
t-family:&quot;Courier New&quot;;color:rgb(51,51,51)">
</span><span style=3D"font-size:9pt;font-family:&quot;Courier New&quot;;col=
or:rgb(119,119,119)">&amp;&amp;</span><span style=3D"font-size:9pt;font-fam=
ily:&quot;Courier New&quot;;color:rgb(51,51,51)"><u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"line-height:13.5pt;background:whitesmoke"><=
span style=3D"font-size:9pt;font-family:&quot;Courier New&quot;;color:rgb(1=
19,119,119)">!!(</span><span style=3D"font-size:9pt;font-family:&quot;Couri=
er New&quot;;color:rgb(122,62,157)">dev</span><span style=3D"font-size:9pt;=
font-family:&quot;Courier New&quot;;color:rgb(119,119,119)">-&gt;</span><sp=
an style=3D"font-size:9pt;font-family:&quot;Courier New&quot;;color:rgb(122=
,62,157)">data</span><span style=3D"font-size:9pt;font-family:&quot;Courier=
 New&quot;;color:rgb(119,119,119)">-&gt;</span><span style=3D"font-size:9pt=
;font-family:&quot;Courier New&quot;;color:rgb(122,62,157)">dev_flags</span=
><span style=3D"font-size:9pt;font-family:&quot;Courier New&quot;;color:rgb=
(51,51,51)">
</span><span style=3D"font-size:9pt;font-family:&quot;Courier New&quot;;col=
or:rgb(119,119,119)">&amp;</span><span style=3D"font-size:9pt;font-family:&=
quot;Courier New&quot;;color:rgb(51,51,51)"> RTE_ETH_DEV_INTR_LSC</span><sp=
an style=3D"font-size:9pt;font-family:&quot;Courier New&quot;;color:rgb(119=
,119,119)">),</span><span style=3D"font-size:9pt;font-family:&quot;Courier =
New&quot;;color:rgb(51,51,51)"><u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"line-height:13.5pt;background:whitesmoke"><=
span style=3D"font-size:9pt;font-family:&quot;Courier New&quot;;color:rgb(1=
19,119,119)">},</span><span style=3D"font-size:9pt;font-family:&quot;Courie=
r New&quot;;color:rgb(51,51,51)"><u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"line-height:13.5pt;background:whitesmoke"><=
span style=3D"font-size:9pt;font-family:&quot;Courier New&quot;;color:rgb(5=
1,51,51)">.rxmode
</span><span style=3D"font-size:9pt;font-family:&quot;Courier New&quot;;col=
or:rgb(119,119,119)">=3D</span><span style=3D"font-size:9pt;font-family:&qu=
ot;Courier New&quot;;color:rgb(51,51,51)">
</span><span style=3D"font-size:9pt;font-family:&quot;Courier New&quot;;col=
or:rgb(119,119,119)">{</span><span style=3D"font-size:9pt;font-family:&quot=
;Courier New&quot;;color:rgb(51,51,51)"><u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"line-height:13.5pt;background:whitesmoke"><=
span style=3D"font-size:9pt;font-family:&quot;Courier New&quot;;color:rgb(5=
1,51,51)">.mq_mode
</span><span style=3D"font-size:9pt;font-family:&quot;Courier New&quot;;col=
or:rgb(119,119,119)">=3D</span><span style=3D"font-size:9pt;font-family:&qu=
ot;Courier New&quot;;color:rgb(51,51,51)"> RTE_ETH_MQ_RX_RSS</span><span st=
yle=3D"font-size:9pt;font-family:&quot;Courier New&quot;;color:rgb(119,119,=
119)">,</span><span style=3D"font-size:9pt;font-family:&quot;Courier New&qu=
ot;;color:rgb(51,51,51)"><u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"line-height:13.5pt;background:whitesmoke"><=
span style=3D"font-size:9pt;font-family:&quot;Courier New&quot;;color:rgb(5=
1,51,51)">.offloads
</span><span style=3D"font-size:9pt;font-family:&quot;Courier New&quot;;col=
or:rgb(119,119,119)">=3D</span><span style=3D"font-size:9pt;font-family:&qu=
ot;Courier New&quot;;color:rgb(51,51,51)"> RTE_ETH_RX_OFFLOAD_VLAN_STRIP
</span><span style=3D"font-size:9pt;font-family:&quot;Courier New&quot;;col=
or:rgb(119,119,119)">|</span><span style=3D"font-size:9pt;font-family:&quot=
;Courier New&quot;;color:rgb(51,51,51)"> RTE_ETH_RX_OFFLOAD_IPV4_CKSUM
</span><span style=3D"font-size:9pt;font-family:&quot;Courier New&quot;;col=
or:rgb(119,119,119)">|</span><span style=3D"font-size:9pt;font-family:&quot=
;Courier New&quot;;color:rgb(51,51,51)"><u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"line-height:13.5pt;background:whitesmoke"><=
span style=3D"font-size:9pt;font-family:&quot;Courier New&quot;;color:rgb(5=
1,51,51)">RTE_ETH_RX_OFFLOAD_RSS_HASH
</span><span style=3D"font-size:9pt;font-family:&quot;Courier New&quot;;col=
or:rgb(119,119,119)">|</span><span style=3D"font-size:9pt;font-family:&quot=
;Courier New&quot;;color:rgb(51,51,51)"> RTE_ETH_RX_OFFLOAD_UDP_CKSUM</span=
><span style=3D"font-size:9pt;font-family:&quot;Courier New&quot;;color:rgb=
(119,119,119)">,</span><span style=3D"font-size:9pt;font-family:&quot;Couri=
er New&quot;;color:rgb(51,51,51)"><u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"line-height:13.5pt;background:whitesmoke"><=
span style=3D"font-size:9pt;font-family:&quot;Courier New&quot;;color:rgb(1=
19,119,119)">},</span><span style=3D"font-size:9pt;font-family:&quot;Courie=
r New&quot;;color:rgb(51,51,51)"><u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"line-height:13.5pt;background:whitesmoke"><=
span style=3D"font-size:9pt;font-family:&quot;Courier New&quot;;color:rgb(5=
1,51,51)">.</span><span style=3D"font-size:9pt;font-family:&quot;Courier Ne=
w&quot;;color:rgb(122,62,157)">rx_adv_conf</span><span style=3D"font-size:9=
pt;font-family:&quot;Courier New&quot;;color:rgb(119,119,119)">.</span><spa=
n style=3D"font-size:9pt;font-family:&quot;Courier New&quot;;color:rgb(122,=
62,157)">rss_conf</span><span style=3D"font-size:9pt;font-family:&quot;Cour=
ier New&quot;;color:rgb(51,51,51)">
</span><span style=3D"font-size:9pt;font-family:&quot;Courier New&quot;;col=
or:rgb(119,119,119)">=3D</span><span style=3D"font-size:9pt;font-family:&qu=
ot;Courier New&quot;;color:rgb(51,51,51)">
</span><span style=3D"font-size:9pt;font-family:&quot;Courier New&quot;;col=
or:rgb(119,119,119)">{</span><span style=3D"font-size:9pt;font-family:&quot=
;Courier New&quot;;color:rgb(51,51,51)"><u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"line-height:13.5pt;background:whitesmoke"><=
span style=3D"font-size:9pt;font-family:&quot;Courier New&quot;;color:rgb(5=
1,51,51)">.rss_hf
</span><span style=3D"font-size:9pt;font-family:&quot;Courier New&quot;;col=
or:rgb(119,119,119)">=3D</span><span style=3D"font-size:9pt;font-family:&qu=
ot;Courier New&quot;;color:rgb(51,51,51)"> RTE_ETH_RSS_NONFRAG_IPV4_TCP
</span><span style=3D"font-size:9pt;font-family:&quot;Courier New&quot;;col=
or:rgb(119,119,119)">|</span><span style=3D"font-size:9pt;font-family:&quot=
;Courier New&quot;;color:rgb(51,51,51)"> RTE_ETH_RSS_NONFRAG_IPV6_TCP</span=
><span style=3D"font-size:9pt;font-family:&quot;Courier New&quot;;color:rgb=
(119,119,119)">,</span><span style=3D"font-size:9pt;font-family:&quot;Couri=
er New&quot;;color:rgb(51,51,51)"><u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"line-height:13.5pt;background:whitesmoke"><=
span style=3D"font-size:9pt;font-family:&quot;Courier New&quot;;color:rgb(5=
1,51,51)">.rss_key
</span><span style=3D"font-size:9pt;font-family:&quot;Courier New&quot;;col=
or:rgb(119,119,119)">=3D</span><span style=3D"font-size:9pt;font-family:&qu=
ot;Courier New&quot;;color:rgb(51,51,51)"> conf_rss_key</span><span style=
=3D"font-size:9pt;font-family:&quot;Courier New&quot;;color:rgb(119,119,119=
)">,</span><span style=3D"font-size:9pt;font-family:&quot;Courier New&quot;=
;color:rgb(51,51,51)"><u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"line-height:13.5pt;background:whitesmoke"><=
span style=3D"font-size:9pt;font-family:&quot;Courier New&quot;;color:rgb(5=
1,51,51)">.rss_key_len
</span><span style=3D"font-size:9pt;font-family:&quot;Courier New&quot;;col=
or:rgb(119,119,119)">=3D</span><span style=3D"font-size:9pt;font-family:&qu=
ot;Courier New&quot;;color:rgb(51,51,51)"> rss_key_len</span><span style=3D=
"font-size:9pt;font-family:&quot;Courier New&quot;;color:rgb(119,119,119)">=
,</span><span style=3D"font-size:9pt;font-family:&quot;Courier New&quot;;co=
lor:rgb(51,51,51)"><u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"line-height:13.5pt;background:whitesmoke"><=
span style=3D"font-size:9pt;font-family:&quot;Courier New&quot;;color:rgb(1=
19,119,119)">},</span><span style=3D"font-size:9pt;font-family:&quot;Courie=
r New&quot;;color:rgb(51,51,51)"><u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"line-height:13.5pt;background:whitesmoke"><=
span style=3D"font-size:9pt;font-family:&quot;Courier New&quot;;color:rgb(5=
1,51,51)">.txmode
</span><span style=3D"font-size:9pt;font-family:&quot;Courier New&quot;;col=
or:rgb(119,119,119)">=3D</span><span style=3D"font-size:9pt;font-family:&qu=
ot;Courier New&quot;;color:rgb(51,51,51)">
</span><span style=3D"font-size:9pt;font-family:&quot;Courier New&quot;;col=
or:rgb(119,119,119)">{</span><span style=3D"font-size:9pt;font-family:&quot=
;Courier New&quot;;color:rgb(51,51,51)"><u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"line-height:13.5pt;background:whitesmoke"><=
span style=3D"font-size:9pt;font-family:&quot;Courier New&quot;;color:rgb(5=
1,51,51)">.offloads
</span><span style=3D"font-size:9pt;font-family:&quot;Courier New&quot;;col=
or:rgb(119,119,119)">=3D</span><span style=3D"font-size:9pt;font-family:&qu=
ot;Courier New&quot;;color:rgb(51,51,51)"> RTE_ETH_TX_OFFLOAD_UDP_CKSUM
</span><span style=3D"font-size:9pt;font-family:&quot;Courier New&quot;;col=
or:rgb(119,119,119)">|</span><span style=3D"font-size:9pt;font-family:&quot=
;Courier New&quot;;color:rgb(51,51,51)"> RTE_ETH_TX_OFFLOAD_IPV4_CKSUM</spa=
n><span style=3D"font-size:9pt;font-family:&quot;Courier New&quot;;color:rg=
b(119,119,119)">,</span><span style=3D"font-size:9pt;font-family:&quot;Cour=
ier New&quot;;color:rgb(51,51,51)"><u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"line-height:13.5pt;background:whitesmoke"><=
span style=3D"font-size:9pt;font-family:&quot;Courier New&quot;;color:rgb(1=
19,119,119)">},</span><span style=3D"font-size:9pt;font-family:&quot;Courie=
r New&quot;;color:rgb(51,51,51)"><u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"line-height:13.5pt;background:whitesmoke"><=
span style=3D"font-size:9pt;font-family:&quot;Courier New&quot;;color:rgb(1=
19,119,119)">};</span><span style=3D"font-size:9pt;font-family:&quot;Courie=
r New&quot;;color:rgb(51,51,51)"><u></u><u></u></span></p>
</div>
</div>
</div>
<div>
<div>
<div>
<p class=3D"MsoNormal" style=3D"line-height:13.5pt;background:whitesmoke"><=
b><span style=3D"font-size:9pt;font-family:&quot;Courier New&quot;;color:rg=
b(170,55,49)">rte_eth_dev_configure</span></b><span style=3D"font-size:9pt;=
font-family:&quot;Courier New&quot;;color:rgb(119,119,119)">(</span><span s=
tyle=3D"font-size:9pt;font-family:&quot;Courier New&quot;;color:rgb(122,62,=
157)">&lt;netvsc
 port&gt;</span><span style=3D"font-size:9pt;font-family:&quot;Courier New&=
quot;;color:rgb(119,119,119)">,</span><span style=3D"font-size:9pt;font-fam=
ily:&quot;Courier New&quot;;color:rgb(51,51,51)">
</span><span style=3D"font-size:9pt;font-family:&quot;Courier New&quot;;col=
or:rgb(122,62,157)">num_rxq</span><span style=3D"font-size:9pt;font-family:=
&quot;Courier New&quot;;color:rgb(119,119,119)">,</span><span style=3D"font=
-size:9pt;font-family:&quot;Courier New&quot;;color:rgb(122,62,157)">num_tx=
q</span><span style=3D"font-size:9pt;font-family:&quot;Courier New&quot;;co=
lor:rgb(119,119,119)">,</span><span style=3D"font-size:9pt;font-family:&quo=
t;Courier New&quot;;color:rgb(51,51,51)">
</span><span style=3D"font-size:9pt;font-family:&quot;Courier New&quot;;col=
or:rgb(119,119,119)">&amp;</span><span style=3D"font-size:9pt;font-family:&=
quot;Courier New&quot;;color:rgb(51,51,51)">conf</span><span style=3D"font-=
size:9pt;font-family:&quot;Courier New&quot;;color:rgb(119,119,119)">);
</span><span style=3D"font-size:9pt;font-family:&quot;Courier New&quot;"><u=
></u><u></u></span></p>
<div>
<div>
<p class=3D"MsoNormal" style=3D"line-height:13.5pt;background:whitesmoke"><=
span style=3D"font-size:9pt;font-family:&quot;Courier New&quot;;color:rgb(1=
22,62,157)">uint8_t</span><span style=3D"font-size:9pt;font-family:&quot;Co=
urier New&quot;;color:rgb(51,51,51)">
</span><span style=3D"font-size:9pt;font-family:&quot;Courier New&quot;;col=
or:rgb(122,62,157)">rss_key_temp</span><span style=3D"font-size:9pt;font-fa=
mily:&quot;Courier New&quot;;color:rgb(119,119,119)">[</span><span style=3D=
"font-size:9pt;font-family:&quot;Courier New&quot;;color:rgb(156,93,39)">64=
</span><span style=3D"font-size:9pt;font-family:&quot;Courier New&quot;;col=
or:rgb(119,119,119)">];</span><span style=3D"font-size:9pt;font-family:&quo=
t;Courier New&quot;;color:rgb(51,51,51)"><u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"line-height:13.5pt;background:whitesmoke"><=
span style=3D"font-size:9pt;font-family:&quot;Courier New&quot;;color:rgb(1=
22,62,157)">struct</span><span style=3D"font-size:9pt;font-family:&quot;Cou=
rier New&quot;;color:rgb(51,51,51)"> rte_eth_rss_conf rss_conf
</span><span style=3D"font-size:9pt;font-family:&quot;Courier New&quot;;col=
or:rgb(119,119,119)">=3D</span><span style=3D"font-size:9pt;font-family:&qu=
ot;Courier New&quot;;color:rgb(51,51,51)">
</span><span style=3D"font-size:9pt;font-family:&quot;Courier New&quot;;col=
or:rgb(119,119,119)">{</span><span style=3D"font-size:9pt;font-family:&quot=
;Courier New&quot;;color:rgb(51,51,51)"><u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"line-height:13.5pt;background:whitesmoke"><=
span style=3D"font-size:9pt;font-family:&quot;Courier New&quot;;color:rgb(5=
1,51,51)">.rss_key
</span><span style=3D"font-size:9pt;font-family:&quot;Courier New&quot;;col=
or:rgb(119,119,119)">=3D</span><span style=3D"font-size:9pt;font-family:&qu=
ot;Courier New&quot;;color:rgb(51,51,51)"> rss_key_temp</span><span style=
=3D"font-size:9pt;font-family:&quot;Courier New&quot;;color:rgb(119,119,119=
)">,</span><span style=3D"font-size:9pt;font-family:&quot;Courier New&quot;=
;color:rgb(51,51,51)"><u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"line-height:13.5pt;background:whitesmoke"><=
span style=3D"font-size:9pt;font-family:&quot;Courier New&quot;;color:rgb(5=
1,51,51)">.rss_key_len
</span><span style=3D"font-size:9pt;font-family:&quot;Courier New&quot;;col=
or:rgb(119,119,119)">=3D</span><span style=3D"font-size:9pt;font-family:&qu=
ot;Courier New&quot;;color:rgb(51,51,51)">
</span><span style=3D"font-size:9pt;font-family:&quot;Courier New&quot;;col=
or:rgb(119,119,119)">sizeof(</span><span style=3D"font-size:9pt;font-family=
:&quot;Courier New&quot;;color:rgb(51,51,51)">rss_key_temp</span><span styl=
e=3D"font-size:9pt;font-family:&quot;Courier New&quot;;color:rgb(119,119,11=
9)">),</span><span style=3D"font-size:9pt;font-family:&quot;Courier New&quo=
t;;color:rgb(51,51,51)"><u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"line-height:13.5pt;background:whitesmoke"><=
span style=3D"font-size:9pt;font-family:&quot;Courier New&quot;;color:rgb(1=
19,119,119)">};</span><span style=3D"font-size:9pt;font-family:&quot;Courie=
r New&quot;;color:rgb(51,51,51)"><u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"line-height:13.5pt;background:whitesmoke"><=
span style=3D"font-size:9pt;font-family:&quot;Courier New&quot;;color:rgb(5=
1,51,51)">ret
</span><span style=3D"font-size:9pt;font-family:&quot;Courier New&quot;;col=
or:rgb(119,119,119)">=3D</span><span style=3D"font-size:9pt;font-family:&qu=
ot;Courier New&quot;;color:rgb(51,51,51)">
</span><b><span style=3D"font-size:9pt;font-family:&quot;Courier New&quot;;=
color:rgb(170,55,49)">rte_eth_dev_rss_hash_conf_get</span></b><span style=
=3D"font-size:9pt;font-family:&quot;Courier New&quot;;color:rgb(119,119,119=
)">(</span><span style=3D"font-size:9pt;font-family:&quot;Courier New&quot;=
;color:rgb(122,62,157)">&lt;VF
 port&gt;</span><span style=3D"font-size:9pt;font-family:&quot;Courier New&=
quot;;color:rgb(119,119,119)">,</span><span style=3D"font-size:9pt;font-fam=
ily:&quot;Courier New&quot;;color:rgb(51,51,51)">
</span><span style=3D"font-size:9pt;font-family:&quot;Courier New&quot;;col=
or:rgb(119,119,119)">&amp;</span><span style=3D"font-size:9pt;font-family:&=
quot;Courier New&quot;;color:rgb(51,51,51)">rss_conf</span><span style=3D"f=
ont-size:9pt;font-family:&quot;Courier New&quot;;color:rgb(119,119,119)">);=
</span><span style=3D"font-size:9pt;font-family:&quot;Courier New&quot;"><u=
></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"line-height:13.5pt;background:whitesmoke"><=
span style=3D"font-size:9pt;font-family:&quot;Courier New&quot;;color:rgb(5=
1,51,51)"><u></u>=C2=A0<u></u></span></p>
</div>
</div>
</div>
</div>
</div>
</div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<div>
<div>
<p class=3D"MsoNormal">Now the VF port RSS offloads show only TCP flags set=
 and not UDP. I assumed that even the UDP flags might be set. Is this expec=
ted ?<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
</div>
<div>
<p class=3D"MsoNormal">Regards,<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal">Nandini=C2=A0<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
</div>
<div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
</div>
<div>
<p class=3D"MsoNormal">On Thu, Sep 12, 2024 at 4:09<span style=3D"font-fami=
ly:Arial,sans-serif">=E2=80=AF</span>PM Stephen Hemminger &lt;<a href=3D"ma=
ilto:stephen@networkplumber.org" target=3D"_blank">stephen@networkplumber.o=
rg</a>&gt; wrote:<u></u><u></u></p>
</div>
<blockquote style=3D"border-top:none;border-right:none;border-bottom:none;b=
order-left:1pt solid rgb(204,204,204);padding:0in 0in 0in 6pt;margin-left:4=
.8pt;margin-right:0in">
<p class=3D"MsoNormal">On Thu, 12 Sep 2024 13:47:37 -0700<br>
Nandini Rangaswamy &lt;<a href=3D"mailto:nandini.rangaswamy@broadcom.com" t=
arget=3D"_blank">nandini.rangaswamy@broadcom.com</a>&gt; wrote:<br>
<br>
&gt; Thanks for your response Long Li.<br>
&gt; I see with netvsc the maximum number of Tx descriptors is restricted t=
o<br>
&gt; 4096 whereas the number of Rx descriptors is restricted to 8192.<br>
&gt; But, for failsafe PMD , we see that both the number of Txd and Rxd is<=
br>
&gt; restricted to 8192.<br>
&gt; How is netvsc PMD giving the same performance as failsafe PMD ?<br>
&gt; <br>
&gt; Regards<br>
<br>
I think the limits there were somewhat arbitrary chose with netvsc.<br>
Don&#39;t remember a hard reason that would block larger sizes.<br>
<br>
<br>
Having really big rings won&#39;t help performance (i.e BufferBloat) and<br=
>
could a lot of memory consumption. When all heavy data traffic goes through=
<br>
the VF and that ring is different. Only DoS attacks should be impacted<br>
by rx/tx descriptor limits in the netvsc device. The linux driver actually<=
br>
has much smaller buffer.<u></u><u></u></p>
</blockquote>
</div>
</div>
<p class=3D"MsoNormal"><br>
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</div></blockquote></div>
</blockquote></div>

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