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References: <20231124100904.388453-1-christian.ehrhardt@canonical.com>
<bf521b7f-fcf1-43e6-9172-2ed649a42934@linux.vnet.ibm.com>
In-Reply-To: <bf521b7f-fcf1-43e6-9172-2ed649a42934@linux.vnet.ibm.com>
From: Christian Ehrhardt <christian.ehrhardt@canonical.com>
Date: Thu, 30 Nov 2023 14:48:15 +0100
Message-ID: <CAATJJ0+rMpKY5e5Cf_hdFcDi3n8hZUA_aXsq6Jo4v-Fd1=MfSQ@mail.gmail.com>
Subject: Re: [PATCH v2] eal/linux: force iova-mode va without pa available
To: David Christensen <drc@linux.vnet.ibm.com>,
Luca Boccassi <bluca@debian.org>
Cc: dev@dpdk.org
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On Wed, Nov 29, 2023 at 10:51=E2=80=AFPM David Christensen <drc@linux.vnet.=
ibm.com>
wrote:
>
>
> On 11/24/23 2:09 AM, christian.ehrhardt@canonical.com wrote:
> > From: David Wilder <dwilder@us.ibm.com>
> >
> > When using --no-huge option physical address are not guaranteed
> > to be persistent.
> >
> > This change effectively makes "--no-huge" the same as
> > "--no-huge --iova-mode=3Dva".
> >
> > When --no-huge is used (or any other condition making physical
> > addresses unavailable) setting --iova-mode=3Dpa will have no effect.
> >
> > Signed-off-by: Christian Ehrhardt <christian.ehrhardt@canonical.com>
> > ---
> > doc/guides/prog_guide/env_abstraction_layer.rst | 9 ++++++---
> > lib/eal/linux/eal.c | 16 ++++++++++------
> > 2 files changed, 16 insertions(+), 9 deletions(-)
> >
> > diff --git a/doc/guides/prog_guide/env_abstraction_layer.rst
> b/doc/guides/prog_guide/env_abstraction_layer.rst
> > index 6debf54efb..20c7355e0f 100644
> > --- a/doc/guides/prog_guide/env_abstraction_layer.rst
> > +++ b/doc/guides/prog_guide/env_abstraction_layer.rst
> > @@ -559,9 +559,12 @@ IOVA Mode is selected by considering what the
> current usable Devices on the
> > system require and/or support.
> >
> > On FreeBSD, RTE_IOVA_PA is always the default. On Linux, the IOVA mod=
e
> is
> > -detected based on a 2-step heuristic detailed below.
> > +detected based on a heuristic detailed below.
> >
> > -For the first step, EAL asks each bus its requirement in terms of IOVA
> mode
> > +For the first step, if no Physical Addresses are available RTE_IOVA_VA
> is
> > +selected.
> > +
> > +Then EAL asks each bus its requirement in terms of IOVA mode
> > and decides on a preferred IOVA mode.
> >
> > - if all buses report RTE_IOVA_PA, then the preferred IOVA mode is
> RTE_IOVA_PA,
> > @@ -575,7 +578,7 @@ and decides on a preferred IOVA mode.
> > If the buses have expressed no preference on which IOVA mode to pick,
> then a
> > default is selected using the following logic:
> >
> > -- if physical addresses are not available, RTE_IOVA_VA mode is used
> > +- if enable_iova_as_pa was not set at build RTE_IOVA_VA mode is used
> > - if /sys/kernel/iommu_groups is not empty, RTE_IOVA_VA mode is used
> > - otherwise, RTE_IOVA_PA mode is used
> >
> > diff --git a/lib/eal/linux/eal.c b/lib/eal/linux/eal.c
> > index 57da058cec..2f1fce3c54 100644
> > --- a/lib/eal/linux/eal.c
> > +++ b/lib/eal/linux/eal.c
> > @@ -1067,6 +1067,16 @@ rte_eal_init(int argc, char **argv)
> >
> > phys_addrs =3D rte_eal_using_phys_addrs() !=3D 0;
> >
> > + if (!phys_addrs) {
> > + /* if we have no access to physical addresses, pick IOVA
> as VA mode. */
> > + if (internal_conf->iova_mode =3D=3D RTE_IOVA_PA)
> > + RTE_LOG(WARNING, EAL, "WARNING: --iova-mode=3Dpa,
> but Physical addresses are unavailable, selecting IOVA as VA mode.\n");
> > + else
> > + RTE_LOG(DEBUG, EAL, "Physical addresses are
> unavailable, selecting IOVA as VA mode.\n");
> > + internal_conf->iova_mode =3D RTE_IOVA_VA;
> > + rte_eal_get_configuration()->iova_mode =3D
> internal_conf->iova_mode;
> > + }
> > +
> > /* if no EAL option "--iova-mode=3D<pa|va>", use bus IOVA scheme =
*/
> > if (internal_conf->iova_mode =3D=3D RTE_IOVA_DC) {
> > /* autodetect the IOVA mapping mode */
> > @@ -1078,12 +1088,6 @@ rte_eal_init(int argc, char **argv)
> > if (!RTE_IOVA_IN_MBUF) {
> > iova_mode =3D RTE_IOVA_VA;
> > RTE_LOG(DEBUG, EAL, "IOVA as VA mode is
> forced by build option.\n");
> > - } else if (!phys_addrs) {
> > - /* if we have no access to physical
> addresses,
> > - * pick IOVA as VA mode.
> > - */
> > - iova_mode =3D RTE_IOVA_VA;
> > - RTE_LOG(DEBUG, EAL, "Physical addresses
> are unavailable, selecting IOVA as VA mode.\n");
> > } else if (is_iommu_enabled()) {
> > /* we have an IOMMU, pick IOVA as VA mode
> */
> > iova_mode =3D RTE_IOVA_VA;
>
> What tests are you running that generate an error without explicitly
> selecting the iova-mode? When I run the fast-tests I see the system
> correctly selecting VA without any additional command-line parameters
> when running 23.11:
>
>
Hi, we run the tests as they are defined in debian/ubuntu autopkgtest, here
a full log:
https://autopkgtest.ubuntu.com/results/autopkgtest-noble-paelzer-dpdk-23.11=
-test-builds/noble/ppc64el/d/dpdk/20231123_134814_ed029@/log.gz
Fasttests, just like yours, fail for us.
But this is a virtual test env that might not be as powerful as yours.
But as I've said, consider this one withdrawn and the one just fixing the
test config preferred.
> 21:47:05 DPDK_TEST=3Dacl_autotest MALLOC_PERTURB_=3D201
> /home/drc/src/dpdk/build/app/dpdk-test --no-huge -m 2048
> ----------------------------------- output
> -----------------------------------
> stdout:
> RTE>>acl_autotest
> acl context <acl_ctx>@0x179cbd300
> socket_id=3D-1
> alg=3D5
> first_load_sz=3D0
> max_rules=3D196608
> rule_size=3D128
> num_rules=3D0
> num_categories=3D0
> num_tries=3D0
> acl context <acl_ctx>@0x179cbd300
> socket_id=3D-1
> alg=3D5
> first_load_sz=3D0
> max_rules=3D196608
> rule_size=3D128
> num_rules=3D0
> num_categories=3D0
> num_tries=3D0
> running test_convert_rules(acl_ipv4vlan_tuple)
> running test_convert_rules(acl_ipv4vlan_tuple,
> RTE_ACL_FIELD_TYPE_BITMASK type for IPv4)
> running test_convert_rules(acl_ipv4vlan_tuple, RTE_ACL_FIELD_TYPE_RANGE
> type for IPv4)
> running test_convert_rules(acl_ipv4vlan_tuple: swap VLAN and PORTs order)
> running test_convert_rules(acl_ipv4vlan_tuple: swap SRC and DST IPv4 orde=
r)
> test_u32_range#1704 starting range test from 0 to 264192
> Test OK
> RTE>>
> stderr:
> EAL: Detected CPU lcores: 128
> EAL: Detected NUMA nodes: 2
> EAL: Detected static linkage of DPDK
> EAL: Multi-process socket /var/run/dpdk/rte/mp_socket
> EAL: Selected IOVA mode 'VA'
>
> Dave
>
--=20
Christian Ehrhardt
Director of Engineering, Ubuntu Server
Canonical Ltd
--000000000000e094c2060b5ee8c3
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable
<div dir=3D"ltr"><div dir=3D"ltr"><br></div><br><div class=3D"gmail_quote">=
<div dir=3D"ltr" class=3D"gmail_attr">On Wed, Nov 29, 2023 at 10:51=E2=80=
=AFPM David Christensen <<a href=3D"mailto:drc@linux.vnet.ibm.com">drc@l=
inux.vnet.ibm.com</a>> wrote:<br></div><blockquote class=3D"gmail_quote"=
style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);p=
adding-left:1ex"><br>
<br>
On 11/24/23 2:09 AM, <a href=3D"mailto:christian.ehrhardt@canonical.com" ta=
rget=3D"_blank">christian.ehrhardt@canonical.com</a> wrote:<br>
> From: David Wilder <<a href=3D"mailto:dwilder@us.ibm.com" target=3D=
"_blank">dwilder@us.ibm.com</a>><br>
> <br>
> When using --no-huge option physical address are not guaranteed<br>
> to be persistent.<br>
> <br>
> This change effectively makes "--no-huge" the same as<br>
> "--no-huge --iova-mode=3Dva".<br>
> <br>
> When --no-huge is used (or any other condition making physical<br>
> addresses unavailable) setting --iova-mode=3Dpa will have no effect.<b=
r>
> <br>
> Signed-off-by: Christian Ehrhardt <<a href=3D"mailto:christian.ehrh=
ardt@canonical.com" target=3D"_blank">christian.ehrhardt@canonical.com</a>&=
gt;<br>
> ---<br>
>=C2=A0 =C2=A0doc/guides/prog_guide/env_abstraction_layer.rst |=C2=A0 9 =
++++++---<br>
>=C2=A0 =C2=A0lib/eal/linux/eal.c=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| 16 ++++=
++++++------<br>
>=C2=A0 =C2=A02 files changed, 16 insertions(+), 9 deletions(-)<br>
> <br>
> diff --git a/doc/guides/prog_guide/env_abstraction_layer.rst b/doc/gui=
des/prog_guide/env_abstraction_layer.rst<br>
> index 6debf54efb..20c7355e0f 100644<br>
> --- a/doc/guides/prog_guide/env_abstraction_layer.rst<br>
> +++ b/doc/guides/prog_guide/env_abstraction_layer.rst<br>
> @@ -559,9 +559,12 @@ IOVA Mode is selected by considering what the cur=
rent usable Devices on the<br>
>=C2=A0 =C2=A0system require and/or support.<br>
> <br>
>=C2=A0 =C2=A0On FreeBSD, RTE_IOVA_PA is always the default. On Linux, t=
he IOVA mode is<br>
> -detected based on a 2-step heuristic detailed below.<br>
> +detected based on a heuristic detailed below.<br>
> <br>
> -For the first step, EAL asks each bus its requirement in terms of IOV=
A mode<br>
> +For the first step, if no Physical Addresses are available RTE_IOVA_V=
A is<br>
> +selected.<br>
> +<br>
> +Then EAL asks each bus its requirement in terms of IOVA mode<br>
>=C2=A0 =C2=A0and decides on a preferred IOVA mode.<br>
> <br>
>=C2=A0 =C2=A0- if all buses report RTE_IOVA_PA, then the preferred IOVA=
mode is RTE_IOVA_PA,<br>
> @@ -575,7 +578,7 @@ and decides on a preferred IOVA mode.<br>
>=C2=A0 =C2=A0If the buses have expressed no preference on which IOVA mo=
de to pick, then a<br>
>=C2=A0 =C2=A0default is selected using the following logic:<br>
> <br>
> -- if physical addresses are not available, RTE_IOVA_VA mode is used<b=
r>
> +- if enable_iova_as_pa was not set at build RTE_IOVA_VA mode is used<=
br>
>=C2=A0 =C2=A0- if /sys/kernel/iommu_groups is not empty, RTE_IOVA_VA mo=
de is used<br>
>=C2=A0 =C2=A0- otherwise, RTE_IOVA_PA mode is used<br>
> <br>
> diff --git a/lib/eal/linux/eal.c b/lib/eal/linux/eal.c<br>
> index 57da058cec..2f1fce3c54 100644<br>
> --- a/lib/eal/linux/eal.c<br>
> +++ b/lib/eal/linux/eal.c<br>
> @@ -1067,6 +1067,16 @@ rte_eal_init(int argc, char **argv)<br>
> <br>
>=C2=A0 =C2=A0 =C2=A0 =C2=A0phys_addrs =3D rte_eal_using_phys_addrs() !=
=3D 0;<br>
> <br>
> +=C2=A0 =C2=A0 =C2=A0if (!phys_addrs) {<br>
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0/* if we have no acce=
ss to physical addresses, pick IOVA as VA mode. */<br>
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0if (internal_conf->=
;iova_mode =3D=3D RTE_IOVA_PA)<br>
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0=
=C2=A0RTE_LOG(WARNING, EAL, "WARNING: --iova-mode=3Dpa, but Physical =
addresses are unavailable, selecting IOVA as VA mode.\n");<br>
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0else<br>
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0=
=C2=A0RTE_LOG(DEBUG, EAL, "Physical addresses are unavailable, select=
ing IOVA as VA mode.\n");<br>
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0internal_conf->iov=
a_mode =3D RTE_IOVA_VA;<br>
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0rte_eal_get_configura=
tion()->iova_mode =3D internal_conf->iova_mode;<br>
> +=C2=A0 =C2=A0 =C2=A0}<br>
> +<br>
>=C2=A0 =C2=A0 =C2=A0 =C2=A0/* if no EAL option "--iova-mode=3D<=
pa|va>", use bus IOVA scheme */<br>
>=C2=A0 =C2=A0 =C2=A0 =C2=A0if (internal_conf->iova_mode =3D=3D RTE_I=
OVA_DC) {<br>
>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0/* autodetect th=
e IOVA mapping mode */<br>
> @@ -1078,12 +1088,6 @@ rte_eal_init(int argc, char **argv)<br>
>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0if (!RTE_IOVA_IN_MBUF) {<br>
>=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=A0iova_mode =3D RTE_IOVA_VA;<br>
>=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=A0RTE_LOG(DEBUG, EAL, "IOVA as =
VA mode is forced by build option.\n");<br>
> -=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0=
=C2=A0} else if (!phys_addrs) {<br>
> -=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/* if we have no access to physical addr=
esses,<br>
> -=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 * pick IOVA as VA mode.<br>
> -=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 */<br>
> -=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=A0iova_mode =3D RTE_IOVA_VA;<br>
> -=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=A0RTE_LOG(DEBUG, EAL, "Physical addre=
sses are unavailable, selecting IOVA as VA mode.\n");<br>
>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0} else if (is_iommu_enabled()) {<br>
>=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/* we have an IOMMU, pick IOVA as =
VA mode */<br>
>=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=A0iova_mode =3D RTE_IOVA_VA;<br>
<br>
What tests are you running that generate an error without explicitly <br>
selecting the iova-mode?=C2=A0 When I run the fast-tests I see the system <=
br>
correctly selecting VA without any additional command-line parameters <br>
when running 23.11:<br>
<br></blockquote><div><br></div><div>Hi, we run the tests as they are defin=
ed in debian/ubuntu autopkgtest, here a full log:</div><div><br></div><div>=
=C2=A0<a href=3D"https://autopkgtest.ubuntu.com/results/autopkgtest-noble-p=
aelzer-dpdk-23.11-test-builds/noble/ppc64el/d/dpdk/20231123_134814_ed029@/l=
og.gz">https://autopkgtest.ubuntu.com/results/autopkgtest-noble-paelzer-dpd=
k-23.11-test-builds/noble/ppc64el/d/dpdk/20231123_134814_ed029@/log.gz</a><=
/div><div><br></div><div>Fasttests, just like yours, fail for us.</div><div=
>But this is a virtual test env that might not be as powerful as yours.</di=
v><div><br></div><div>But as I've said, consider this one withdrawn and=
the one just fixing the test config preferred.</div><div><br></div><blockq=
uote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1p=
x solid rgb(204,204,204);padding-left:1ex">
<br>
21:47:05 DPDK_TEST=3Dacl_autotest MALLOC_PERTURB_=3D201 <br>
/home/drc/src/dpdk/build/app/dpdk-test --no-huge -m 2048<br>
----------------------------------- output <br>
-----------------------------------<br>
stdout:<br>
RTE>>acl_autotest<br>
acl context <acl_ctx>@0x179cbd300<br>
=C2=A0 =C2=A0socket_id=3D-1<br>
=C2=A0 =C2=A0alg=3D5<br>
=C2=A0 =C2=A0first_load_sz=3D0<br>
=C2=A0 =C2=A0max_rules=3D196608<br>
=C2=A0 =C2=A0rule_size=3D128<br>
=C2=A0 =C2=A0num_rules=3D0<br>
=C2=A0 =C2=A0num_categories=3D0<br>
=C2=A0 =C2=A0num_tries=3D0<br>
acl context <acl_ctx>@0x179cbd300<br>
=C2=A0 =C2=A0socket_id=3D-1<br>
=C2=A0 =C2=A0alg=3D5<br>
=C2=A0 =C2=A0first_load_sz=3D0<br>
=C2=A0 =C2=A0max_rules=3D196608<br>
=C2=A0 =C2=A0rule_size=3D128<br>
=C2=A0 =C2=A0num_rules=3D0<br>
=C2=A0 =C2=A0num_categories=3D0<br>
=C2=A0 =C2=A0num_tries=3D0<br>
running test_convert_rules(acl_ipv4vlan_tuple)<br>
running test_convert_rules(acl_ipv4vlan_tuple, <br>
RTE_ACL_FIELD_TYPE_BITMASK type for IPv4)<br>
running test_convert_rules(acl_ipv4vlan_tuple, RTE_ACL_FIELD_TYPE_RANGE <br=
>
type for IPv4)<br>
running test_convert_rules(acl_ipv4vlan_tuple: swap VLAN and PORTs order)<b=
r>
running test_convert_rules(acl_ipv4vlan_tuple: swap SRC and DST IPv4 order)=
<br>
test_u32_range#1704 starting range test from 0 to 264192<br>
Test OK<br>
RTE>><br>
stderr:<br>
EAL: Detected CPU lcores: 128<br>
EAL: Detected NUMA nodes: 2<br>
EAL: Detected static linkage of DPDK<br>
EAL: Multi-process socket /var/run/dpdk/rte/mp_socket<br>
EAL: Selected IOVA mode 'VA'<br>
<br>
Dave<br>
</blockquote></div><br clear=3D"all"><div><br></div><span class=3D"gmail_si=
gnature_prefix">-- </span><br><div dir=3D"ltr" class=3D"gmail_signature"><d=
iv dir=3D"ltr">Christian Ehrhardt<br><span style=3D"color:rgb(34,34,34)">Di=
rector of Engineering</span>, Ubuntu Server<br>Canonical Ltd</div></div></d=
iv>
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