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<20240828120509.68d06992@hermes.local>
In-Reply-To: <20240828120509.68d06992@hermes.local>
From: Nandini Rangaswamy <nandini.rangaswamy@broadcom.com>
Date: Thu, 29 Aug 2024 09:11:58 -0700
Message-ID: <CAAkQrK9DwuTmKQ5gcxYtHdVUbV98_LcXatzzhkynyymoSKWZeg@mail.gmail.com>
Subject: Re: configuring RSS offloads with Netvsc PMD
To: Stephen Hemminger <stephen@networkplumber.org>
Cc: Long Li <longli@microsoft.com>, users@dpdk.org
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Hi Stephen,
It does not work because the netvsc device is not initialized with
RTE_ETH_RSS_NONFRAG_IPV6_UDP
capability according to the below snippet.
static void hn_rss_hash_init(struct hn_data *hv,
const struct rte_eth_rss_conf *rss_conf)
{
/* Convert from DPDK RSS hash flags to NDIS hash flags */
hv->rss_hash =3D NDIS_HASH_FUNCTION_TOEPLITZ;
if (rss_conf->rss_hf & RTE_ETH_RSS_IPV4)
hv->rss_hash |=3D NDIS_HASH_IPV4;
if (rss_conf->rss_hf & RTE_ETH_RSS_NONFRAG_IPV4_TCP)
hv->rss_hash |=3D NDIS_HASH_TCP_IPV4;
if (rss_conf->rss_hf & RTE_ETH_RSS_IPV6)
hv->rss_hash |=3D NDIS_HASH_IPV6;
if (rss_conf->rss_hf & RTE_ETH_RSS_IPV6_EX)
hv->rss_hash |=3D NDIS_HASH_IPV6_EX;
if (rss_conf->rss_hf & RTE_ETH_RSS_NONFRAG_IPV6_TCP)
hv->rss_hash |=3D NDIS_HASH_TCP_IPV6;
if (rss_conf->rss_hf & RTE_ETH_RSS_IPV6_TCP_EX)
hv->rss_hash |=3D NDIS_HASH_TCP_IPV6_EX;
memcpy(hv->rss_key, rss_conf->rss_key ? : rss_default_key,
NDIS_HASH_KEYSIZE_TOEPLITZ);
}
Since hn_dev_info_get merges the configuration of the netvsc device and VF
using AND operation(in hn_vf_info_merge), even though VF(MLX5)
supports RTE_ETH_RSS_NONFRAG_IPV6_UDP
, the netvsc driver does not return this capability support to the app.
Why is RTE_ETH_RSS_NONFRAG_IPV6_UDP capability not supported by the netvsc
driver?
Regards,
Nandini
On Wed, Aug 28, 2024 at 12:05=E2=80=AFPM Stephen Hemminger <
stephen@networkplumber.org> wrote:
> On Wed, 28 Aug 2024 10:32:17 -0700
> Nandini Rangaswamy <nandini.rangaswamy@broadcom.com> wrote:
>
> > Hi Long and Stephen,
> > I am trying to configure RSS offloads from my DPDK App with netvsc PMD.
> > Netvsc seems to be supporting the following offloads:
> > RTE_ETH_RSS_NONFRAG_IPV4_UDP RTE_ETH_RSS_NONFRAG_IPV4_TCP
> > RTE_ETH_RSS_NONFRAG_IPV6_TCP RTE_ETH_RSS_IPV4
> > RTE_ETH_RSS_IPV6
> >
> > However, the app is trying to configure the following offloads and
> failing:
> >
> > RTE_ETH_RSS_NONFRAG_IPV4_UDP
> > RTE_ETH_RSS_NONFRAG_IPV4_TCP
> > RTE_ETH_RSS_NONFRAG_IPV6_TCP
> > RTE_ETH_RSS_NONFRAG_IPV6_UDP
>
> Confusing, both of these overlap should work.
> Please instrument the configure code in netvsc to see why it is
> complaining.
>
> >
> > Is it possible to bypass the netvsc PMD and configure these offloads on
> VF
> > ? I am aware that app should not directly program the VF interface
> > but for performance sake, I want the above offloads to be supported on
> VF.
>
> No can't bypass driver.
>
> You do need to configure multiqueue and enable RSS in configure
> to get anything.
>
> If you look at hn_rss_hash_init, the driver needs to convert the
> requested flags into NDIS flags to tell the host what to do.
>
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<div dir=3D"ltr"><div dir=3D"ltr">Hi Stephen,<div>It does not work because =
the netvsc device is not initialized with=C2=A0<span style=3D"color:rgb(80,=
0,80)">RTE_ETH_RSS_NONFRAG_IPV6_UDP capability according to the below snipp=
et</span>.</div><div><br></div><div><div style=3D"color:rgb(51,51,51);backg=
round-color:rgb(245,245,245);font-family:Menlo,Monaco,"Courier New&quo=
t;,monospace;font-size:12px;line-height:18px;white-space:pre"><div><span st=
yle=3D"color:rgb(75,105,198)">static</span> <span style=3D"color:rgb(122,62=
,157)">void</span> <span style=3D"color:rgb(170,55,49);font-weight:bold">hn=
_rss_hash_init</span><span style=3D"color:rgb(119,119,119)">(</span><span s=
tyle=3D"color:rgb(122,62,157)">struct</span> <span style=3D"color:rgb(122,6=
2,157);font-weight:bold">hn_data</span> <span style=3D"color:rgb(119,119,11=
9)">*</span><span style=3D"color:rgb(122,62,157)">hv</span><span style=3D"c=
olor:rgb(119,119,119)">,</span></div><div> <span style=3D"c=
olor:rgb(75,105,198)">const</span> <span style=3D"color:rgb(122,62,157)">st=
ruct</span> <span style=3D"color:rgb(122,62,157);font-weight:bold">rte_eth_=
rss_conf</span> <span style=3D"color:rgb(119,119,119)">*</span><span style=
=3D"color:rgb(122,62,157)">rss_conf</span><span style=3D"color:rgb(119,119,=
119)">)</span></div><div><span style=3D"color:rgb(119,119,119)">{</span></d=
iv><div><span style=3D"color:rgb(170,170,170);font-style:italic"> /* Con=
vert from DPDK RSS hash flags to NDIS hash flags */</span></div><div> <s=
pan style=3D"color:rgb(122,62,157)">hv</span><span style=3D"color:rgb(119,1=
19,119)">-></span><span style=3D"color:rgb(122,62,157)">rss_hash</span> =
<span style=3D"color:rgb(119,119,119)">=3D</span> <span style=3D"color:rgb(=
170,55,49);font-weight:bold">NDIS_HASH_FUNCTION_TOEPLITZ</span><span style=
=3D"color:rgb(119,119,119)">;</span></div><br><div> <span style=3D"color=
:rgb(75,105,198)">if</span> <span style=3D"color:rgb(119,119,119)">(</span>=
<span style=3D"color:rgb(122,62,157)">rss_conf</span><span style=3D"color:r=
gb(119,119,119)">-></span><span style=3D"color:rgb(122,62,157)">rss_hf</=
span> <span style=3D"color:rgb(119,119,119)">&</span> <span style=3D"co=
lor:rgb(170,55,49);font-weight:bold">RTE_ETH_RSS_IPV4</span><span style=3D"=
color:rgb(119,119,119)">)</span></div><div> <span style=3D"color:rgb=
(122,62,157)">hv</span><span style=3D"color:rgb(119,119,119)">-></span><=
span style=3D"color:rgb(122,62,157)">rss_hash</span> <span style=3D"color:r=
gb(119,119,119)">|=3D</span> <span style=3D"color:rgb(170,55,49);font-weigh=
t:bold">NDIS_HASH_IPV4</span><span style=3D"color:rgb(119,119,119)">;</span=
></div><div> <span style=3D"color:rgb(75,105,198)">if</span> <span style=
=3D"color:rgb(119,119,119)">(</span><span style=3D"color:rgb(122,62,157)">r=
ss_conf</span><span style=3D"color:rgb(119,119,119)">-></span><span styl=
e=3D"color:rgb(122,62,157)">rss_hf</span> <span style=3D"color:rgb(119,119,=
119)">&</span> <span style=3D"color:rgb(170,55,49);font-weight:bold">RT=
E_ETH_RSS_NONFRAG_IPV4_TCP</span><span style=3D"color:rgb(119,119,119)">)</=
span></div><div> <span style=3D"color:rgb(122,62,157)">hv</span><spa=
n style=3D"color:rgb(119,119,119)">-></span><span style=3D"color:rgb(122=
,62,157)">rss_hash</span> <span style=3D"color:rgb(119,119,119)">|=3D</span=
> <span style=3D"color:rgb(170,55,49);font-weight:bold">NDIS_HASH_TCP_IPV4<=
/span><span style=3D"color:rgb(119,119,119)">;</span></div><div> <span s=
tyle=3D"color:rgb(75,105,198)">if</span> <span style=3D"color:rgb(119,119,1=
19)">(</span><span style=3D"color:rgb(122,62,157)">rss_conf</span><span sty=
le=3D"color:rgb(119,119,119)">-></span><span style=3D"color:rgb(122,62,1=
57)">rss_hf</span> <span style=3D"color:rgb(119,119,119)">&</span> <spa=
n style=3D"color:rgb(170,55,49);font-weight:bold">RTE_ETH_RSS_IPV6</span><s=
pan style=3D"color:rgb(119,119,119)">)</span></div><div> <span style=
=3D"color:rgb(122,62,157)">hv</span><span style=3D"color:rgb(119,119,119)">=
-></span><span style=3D"color:rgb(122,62,157)">rss_hash</span> <span sty=
le=3D"color:rgb(119,119,119)">|=3D</span> <span style=3D"color:rgb(170,55,=
49);font-weight:bold">NDIS_HASH_IPV6</span><span style=3D"color:rgb(119,119=
,119)">;</span></div><div> <span style=3D"color:rgb(75,105,198)">if</spa=
n> <span style=3D"color:rgb(119,119,119)">(</span><span style=3D"color:rgb(=
122,62,157)">rss_conf</span><span style=3D"color:rgb(119,119,119)">-></s=
pan><span style=3D"color:rgb(122,62,157)">rss_hf</span> <span style=3D"colo=
r:rgb(119,119,119)">&</span> <span style=3D"color:rgb(170,55,49);font-w=
eight:bold">RTE_ETH_RSS_IPV6_EX</span><span style=3D"color:rgb(119,119,119)=
">)</span></div><div> <span style=3D"color:rgb(122,62,157)">hv</span=
><span style=3D"color:rgb(119,119,119)">-></span><span style=3D"color:rg=
b(122,62,157)">rss_hash</span> <span style=3D"color:rgb(119,119,119)">|=3D<=
/span> <span style=3D"color:rgb(170,55,49);font-weight:bold">NDIS_HASH_IPV=
6_EX</span><span style=3D"color:rgb(119,119,119)">;</span></div><div> <s=
pan style=3D"color:rgb(75,105,198)">if</span> <span style=3D"color:rgb(119,=
119,119)">(</span><span style=3D"color:rgb(122,62,157)">rss_conf</span><spa=
n style=3D"color:rgb(119,119,119)">-></span><span style=3D"color:rgb(122=
,62,157)">rss_hf</span> <span style=3D"color:rgb(119,119,119)">&</span>=
<span style=3D"color:rgb(170,55,49);font-weight:bold">RTE_ETH_RSS_NONFRAG_=
IPV6_TCP</span><span style=3D"color:rgb(119,119,119)">)</span></div><div> =
<span style=3D"color:rgb(122,62,157)">hv</span><span style=3D"color:r=
gb(119,119,119)">-></span><span style=3D"color:rgb(122,62,157)">rss_hash=
</span> <span style=3D"color:rgb(119,119,119)">|=3D</span> <span style=3D"c=
olor:rgb(170,55,49);font-weight:bold">NDIS_HASH_TCP_IPV6</span><span style=
=3D"color:rgb(119,119,119)">;</span></div><div> <span style=3D"color:rgb=
(75,105,198)">if</span> <span style=3D"color:rgb(119,119,119)">(</span><spa=
n style=3D"color:rgb(122,62,157)">rss_conf</span><span style=3D"color:rgb(1=
19,119,119)">-></span><span style=3D"color:rgb(122,62,157)">rss_hf</span=
> <span style=3D"color:rgb(119,119,119)">&</span> <span style=3D"color:=
rgb(170,55,49);font-weight:bold">RTE_ETH_RSS_IPV6_TCP_EX</span><span style=
=3D"color:rgb(119,119,119)">)</span></div><div> <span style=3D"color=
:rgb(122,62,157)">hv</span><span style=3D"color:rgb(119,119,119)">-></sp=
an><span style=3D"color:rgb(122,62,157)">rss_hash</span> <span style=3D"col=
or:rgb(119,119,119)">|=3D</span> <span style=3D"color:rgb(170,55,49);font-w=
eight:bold">NDIS_HASH_TCP_IPV6_EX</span><span style=3D"color:rgb(119,119,11=
9)">;</span></div><br><div> <span style=3D"color:rgb(170,55,49);font-wei=
ght:bold">memcpy</span><span style=3D"color:rgb(119,119,119)">(</span><span=
style=3D"color:rgb(122,62,157)">hv</span><span style=3D"color:rgb(119,119,=
119)">-></span><span style=3D"color:rgb(122,62,157)">rss_key</span><span=
style=3D"color:rgb(119,119,119)">,</span> <span style=3D"color:rgb(122,62,=
157)">rss_conf</span><span style=3D"color:rgb(119,119,119)">-></span><sp=
an style=3D"color:rgb(122,62,157)">rss_key</span> <span style=3D"color:rgb(=
119,119,119)">?</span> <span style=3D"color:rgb(119,119,119)">:</span> <spa=
n style=3D"color:rgb(122,62,157)">rss_default_key</span><span style=3D"colo=
r:rgb(119,119,119)">,</span></div><div> <span style=3D"color:rgb(=
170,55,49);font-weight:bold">NDIS_HASH_KEYSIZE_TOEPLITZ</span><span style=
=3D"color:rgb(119,119,119)">);</span></div><div><span style=3D"color:rgb(11=
9,119,119)">}</span></div></div></div></div><br><div class=3D"gmail_quote">=
<div class=3D"gmail_attr">Since hn_dev_info_get merges the configuration of=
the netvsc device and VF using AND operation(<span style=3D"color:rgb(80,0=
,80)">in=C2=A0</span><span style=3D"color:rgb(170,55,49);font-weight:bold;b=
ackground-color:rgb(245,245,245);font-family:Menlo,Monaco,"Courier New=
",monospace;font-size:12px;white-space:pre">hn_vf_info_merge</span>), =
even though VF(MLX5) supports=C2=A0<span style=3D"color:rgb(80,0,80)">RTE_E=
TH_RSS_NONFRAG_IPV6_UDP , the netvsc driver does not return this capability=
support to the app.</span></div><div class=3D"gmail_attr"><font color=3D"#=
500050">Why is=C2=A0</font><span style=3D"color:rgb(80,0,80)">RTE_ETH_RSS_N=
ONFRAG_IPV6_UDP capability not supported by the netvsc driver?</span></div>=
<div class=3D"gmail_attr"><span style=3D"color:rgb(80,0,80)"><br></span></d=
iv><div class=3D"gmail_attr"><span style=3D"color:rgb(80,0,80)">Regards,</s=
pan></div><div class=3D"gmail_attr"><span style=3D"color:rgb(80,0,80)">Nand=
ini</span></div><div dir=3D"ltr" class=3D"gmail_attr"><br></div><div dir=3D=
"ltr" class=3D"gmail_attr"><br></div><div dir=3D"ltr" class=3D"gmail_attr">=
<br></div><div dir=3D"ltr" class=3D"gmail_attr">On Wed, Aug 28, 2024 at 12:=
05=E2=80=AFPM Stephen Hemminger <<a href=3D"mailto:stephen@networkplumbe=
r.org">stephen@networkplumber.org</a>> wrote:<br></div><blockquote class=
=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rg=
b(204,204,204);padding-left:1ex">On Wed, 28 Aug 2024 10:32:17 -0700<br>
Nandini Rangaswamy <<a href=3D"mailto:nandini.rangaswamy@broadcom.com" t=
arget=3D"_blank">nandini.rangaswamy@broadcom.com</a>> wrote:<br>
<br>
> Hi Long and Stephen,<br>
> I am trying to configure RSS offloads from my DPDK App with netvsc PMD=
.<br>
> Netvsc seems to be supporting the following offloads:<br>
> RTE_ETH_RSS_NONFRAG_IPV4_UDP RTE_ETH_RSS_NONFRAG_IPV4_TCP<br>
> RTE_ETH_RSS_NONFRAG_IPV6_TCP RTE_ETH_RSS_IPV4<br>
> RTE_ETH_RSS_IPV6<br>
> <br>
> However, the app is trying to configure the following offloads and fai=
ling:<br>
> <br>
> RTE_ETH_RSS_NONFRAG_IPV4_UDP<br>
> RTE_ETH_RSS_NONFRAG_IPV4_TCP<br>
> RTE_ETH_RSS_NONFRAG_IPV6_TCP<br>
> RTE_ETH_RSS_NONFRAG_IPV6_UDP<br>
<br>
Confusing, both of these overlap should work.<br>
Please instrument the configure code in netvsc to see why it is complaining=
.<br>
<br>
> <br>
> Is it possible to bypass the netvsc PMD and configure these offloads o=
n VF<br>
> ? I am aware that app should not directly program the VF interface<br>
> but for performance sake, I want the above offloads to be supported on=
VF.<br>
<br>
No can't bypass driver.<br>
<br>
You do need to configure multiqueue and enable RSS in configure<br>
to get anything.<br>
<br>
If you look at hn_rss_hash_init, the driver needs to convert the<br>
requested flags into NDIS flags to tell the host what to do.<br>
</blockquote></div></div>
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