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[96.60.249.169]) by smtp.gmail.com with ESMTPSA id 3f1490d57ef6-eb38392891asm1685426276.18.2025.09.26.16.47.40 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 26 Sep 2025 16:47:40 -0700 (PDT) Message-ID: <6e3bae27-f2d0-4f2c-bd51-a1c1bd8329b7@gmail.com> Date: Fri, 26 Sep 2025 19:47:34 -0400 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v6 1/4] tools: add xdp-forwarder To: Alyssa Ross References: <20250924114300.100541-1-yureka@cyberchaos.dev> <20250924114300.100541-2-yureka@cyberchaos.dev> <877bxmdfg8.fsf@alyssa.is> Content-Language: en-US From: Demi Marie Obenour Autocrypt: addr=demiobenour@gmail.com; keydata= xsFNBFp+A0oBEADffj6anl9/BHhUSxGTICeVl2tob7hPDdhHNgPR4C8xlYt5q49yB+l2nipd aq+4Gk6FZfqC825TKl7eRpUjMriwle4r3R0ydSIGcy4M6eb0IcxmuPYfbWpr/si88QKgyGSV Z7GeNW1UnzTdhYHuFlk8dBSmB1fzhEYEk0RcJqg4AKoq6/3/UorR+FaSuVwT7rqzGrTlscnT DlPWgRzrQ3jssesI7sZLm82E3pJSgaUoCdCOlL7MMPCJwI8JpPlBedRpe9tfVyfu3euTPLPx wcV3L/cfWPGSL4PofBtB8NUU6QwYiQ9Hzx4xOyn67zW73/G0Q2vPPRst8LBDqlxLjbtx/WLR 6h3nBc3eyuZ+q62HS1pJ5EvUT1vjyJ1ySrqtUXWQ4XlZyoEFUfpJxJoN0A9HCxmHGVckzTRl 5FMWo8TCniHynNXsBtDQbabt7aNEOaAJdE7to0AH3T/Bvwzcp0ZJtBk0EM6YeMLtotUut7h2 Bkg1b//r6bTBswMBXVJ5H44Qf0+eKeUg7whSC9qpYOzzrm7+0r9F5u3qF8ZTx55TJc2g656C 9a1P1MYVysLvkLvS4H+crmxA/i08Tc1h+x9RRvqba4lSzZ6/Tmt60DPM5Sc4R0nSm9BBff0N m0bSNRS8InXdO1Aq3362QKX2NOwcL5YaStwODNyZUqF7izjK4QARAQABzTxEZW1pIE1hcmll IE9iZW5vdXIgKGxvdmVyIG9mIGNvZGluZykgPGRlbWlvYmVub3VyQGdtYWlsLmNvbT7CwXgE EwECACIFAlp+A0oCGwMGCwkIBwMCBhUIAgkKCwQWAgMBAh4BAheAAAoJELKItV//nCLBhr8Q AK/xrb4wyi71xII2hkFBpT59ObLN+32FQT7R3lbZRjVFjc6yMUjOb1H/hJVxx+yo5gsSj5LS 9AwggioUSrcUKldfA/PKKai2mzTlUDxTcF3vKx6iMXKA6AqwAw4B57ZEJoMM6egm57TV19kz PMc879NV2nc6+elaKl+/kbVeD3qvBuEwsTe2Do3HAAdrfUG/j9erwIk6gha/Hp9yZlCnPTX+ VK+xifQqt8RtMqS5R/S8z0msJMI/ajNU03kFjOpqrYziv6OZLJ5cuKb3bZU5aoaRQRDzkFIR 6aqtFLTohTo20QywXwRa39uFaOT/0YMpNyel0kdOszFOykTEGI2u+kja35g9TkH90kkBTG+a EWttIht0Hy6YFmwjcAxisSakBuHnHuMSOiyRQLu43ej2+mDWgItLZ48Mu0C3IG1seeQDjEYP tqvyZ6bGkf2Vj+L6wLoLLIhRZxQOedqArIk/Sb2SzQYuxN44IDRt+3ZcDqsPppoKcxSyd1Ny 2tpvjYJXlfKmOYLhTWs8nwlAlSHX/c/jz/ywwf7eSvGknToo1Y0VpRtoxMaKW1nvH0OeCSVJ itfRP7YbiRVc2aNqWPCSgtqHAuVraBRbAFLKh9d2rKFB3BmynTUpc1BQLJP8+D5oNyb8Ts4x Xd3iV/uD8JLGJfYZIR7oGWFLP4uZ3tkneDfYzsFNBFp+A0oBEAC9ynZI9LU+uJkMeEJeJyQ/ 8VFkCJQPQZEsIGzOTlPnwvVna0AS86n2Z+rK7R/usYs5iJCZ55/JISWd8xD57ue0eB47bcJv VqGlObI2DEG8TwaW0O0duRhDgzMEL4t1KdRAepIESBEA/iPpI4gfUbVEIEQuqdqQyO4GAe+M kD0Hy5JH/0qgFmbaSegNTdQg5iqYjRZ3ttiswalql1/iSyv1WYeC1OAs+2BLOAT2NEggSiVO txEfgewsQtCWi8H1SoirakIfo45Hz0tk/Ad9ZWh2PvOGt97Ka85o4TLJxgJJqGEnqcFUZnJJ riwoaRIS8N2C8/nEM53jb1sH0gYddMU3QxY7dYNLIUrRKQeNkF30dK7V6JRH7pleRlf+wQcN fRAIUrNlatj9TxwivQrKnC9aIFFHEy/0mAgtrQShcMRmMgVlRoOA5B8RTulRLCmkafvwuhs6 dCxN0GNAORIVVFxjx9Vn7OqYPgwiofZ6SbEl0hgPyWBQvE85klFLZLoj7p+joDY1XNQztmfA rnJ9x+YV4igjWImINAZSlmEcYtd+xy3Li/8oeYDAqrsnrOjb+WvGhCykJk4urBog2LNtcyCj kTs7F+WeXGUo0NDhbd3Z6AyFfqeF7uJ3D5hlpX2nI9no/ugPrrTVoVZAgrrnNz0iZG2DVx46 x913pVKHl5mlYQARAQABwsFfBBgBAgAJBQJafgNKAhsMAAoJELKItV//nCLBwNIP/AiIHE8b oIqReFQyaMzxq6lE4YZCZNj65B/nkDOvodSiwfwjjVVE2V3iEzxMHbgyTCGA67+Bo/d5aQGj gn0TPtsGzelyQHipaUzEyrsceUGWYoKXYyVWKEfyh0cDfnd9diAm3VeNqchtcMpoehETH8fr RHnJdBcjf112PzQSdKC6kqU0Q196c4Vp5HDOQfNiDnTf7gZSj0BraHOByy9LEDCLhQiCmr+2 E0rW4tBtDAn2HkT9uf32ZGqJCn1O+2uVfFhGu6vPE5qkqrbSE8TG+03H8ecU2q50zgHWPdHM OBvy3EhzfAh2VmOSTcRK+tSUe/u3wdLRDPwv/DTzGI36Kgky9MsDC5gpIwNbOJP2G/q1wT1o Gkw4IXfWv2ufWiXqJ+k7HEi2N1sree7Dy9KBCqb+ca1vFhYPDJfhP75I/VnzHVssZ/rYZ9+5 1yDoUABoNdJNSGUYl+Yh9Pw9pE3Kt4EFzUlFZWbE4xKL/NPno+z4J9aWemLLszcYz/u3XnbO vUSQHSrmfOzX3cV4yfmjM5lewgSstoxGyTx2M8enslgdXhPthZlDnTnOT+C+OTsh8+m5tos8 HQjaPM01MKBiAqdPgksm1wu2DrrwUi6ChRVTUBcj6+/9IJ81H2P2gJk3Ls3AVIxIffLoY34E +MYSfkEjBz0E8CLOcAw7JIwAaeBT In-Reply-To: <877bxmdfg8.fsf@alyssa.is> Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="------------cuhKQdLlWN0HxOkGAcAB9tOg" Message-ID-Hash: SV2C6F4VGNV2ZVECTFKG7FXXCWTYKBZM X-Message-ID-Hash: SV2C6F4VGNV2ZVECTFKG7FXXCWTYKBZM X-MailFrom: demiobenour@gmail.com X-Mailman-Rule-Misses: dmarc-mitigation; no-senders; approved; emergency; loop; banned-address; member-moderation; header-match-devel.spectrum-os.org-0; header-match-devel.spectrum-os.org-1; header-match-devel.spectrum-os.org-2; header-match-devel.spectrum-os.org-3; header-match-devel.spectrum-os.org-4; nonmember-moderation; administrivia; implicit-dest; max-recipients; max-size; news-moderation; no-subject; digests; suspicious-header CC: Yureka Lilian , devel@spectrum-os.org X-Mailman-Version: 3.3.9 Precedence: list List-Id: Patches and low-level development discussion Archived-At: List-Archive: List-Help: List-Owner: List-Post: List-Subscribe: List-Unsubscribe: This is an OpenPGP/MIME signed message (RFC 4880 and 3156) --------------cuhKQdLlWN0HxOkGAcAB9tOg Content-Type: multipart/mixed; boundary="------------bDF0cTK0hNvO7bGVyWlwA3oq"; protected-headers="v1" From: Demi Marie Obenour To: Alyssa Ross Cc: Yureka Lilian , devel@spectrum-os.org Message-ID: <6e3bae27-f2d0-4f2c-bd51-a1c1bd8329b7@gmail.com> Subject: Re: [PATCH v6 1/4] tools: add xdp-forwarder References: <20250924114300.100541-1-yureka@cyberchaos.dev> <20250924114300.100541-2-yureka@cyberchaos.dev> <877bxmdfg8.fsf@alyssa.is> In-Reply-To: <877bxmdfg8.fsf@alyssa.is> Autocrypt-Gossip: addr=hi@alyssa.is; keydata= xsFNBFpSgoYBEAC4xkCYidG2JlRWulUkTWcx0pHFDf3oSbb6Q872Kb3iDChWgluNVz43hva1 3xfDo9foV0GoyfGl/ycSCkXX5hlQr7ir/5FN38E7H/yY6tH8+l68iDgIOcb1qY0OYaxyg+Lz WesfFQedrmwNTbF4L1BtWzrTR5PflDdhDo5VWSguHGJFSclchcr/6UmMb/gOUN+2ElBC2TE2 EKY099phZ6DJZ2aZCsclwKIdCpZzXlEmXPAeaH5om6xo90JYv5+sFji40R0Plqec3WC+jTxy lGca6IbPdOminuUF+GvsR86eVsgh/0XNK7/zus7gyc4PuMUA1rCoeHcWOBDPgmelgCQyJGXd /bXeKuUsGoge58uc7/YNvOh1vfpD3AaEMqAyXfmmUwBnIicml74+2eOpH3Oljfs01g+DhkOB MtpVSZSgaIDvP0WG6cbAxImoUasnmNxEDNskfVmI8bsajPW9bt4z5hiP5Q9G3vE0D5HcIFdM adOz81PpOwNiUXcjtYV1PWZQ56jbSTOf8EBvsB71WwB+XgVWcPzIlY8hAykiHIO87oV3o71U JTAn1Foj7mjSADnY0deleOmar/K5jrK3wvKKM1XlB7PXcGBdkorJC+cbxVsw0ADzMw0c7bVc wEE7OFvHjQiIK1lO+lb1cvGBBY3IZxjsjZdA/VsFHFdAeYlzNQARAQABzRpBbHlzc2EgUm9z cyA8aGlAYWx5c3NhLmlzPsLBlwQTAQgAQQIbAwULCQgHAgYVCAkKCwIEFgIDAQIeAQIXgAIZ ARYhBHVzVtd5u7iIdz5BXnNszfnvUb2XBQJoh9HmBQkOtoJgAAoJEHNszfnvUb2XFxAP/jF7 Rxuspytz7VwOA/y5WQe/FdPNRvyRUzj66ZzfuaG++md14LWcrvbb2hHLdS5ePdKoOaqC3xhK Ncy/5RVd4pD5N4AY7O5228JKDO8GGWEl3rupOCmYQL9P8GpsdGt2xkFqbu4HrFzMTzl6nvKN GtvhBSCkAW3v7wTwPf2rkjX8f+clmRZn4YLfojaBCT/ZFjmJkQSWZ+2rUZOxjgZgckLkplu8 LVILVdaHNLkOrxbKQLuuVyEkN+/YrshyJP4a7Z/Tnw+3eZcaLuLOxBHpWOAAgJZ8kL+V7BxK DlTywv/OOr0CoNi9zjH3VgRiJ1961K/DocjA50pWBilMUs4jGp9omhkAOwdNV2hi+Zj/GXaD kgvBlE313DGWzgW0RauL8j5/GULgphwm5UOHXb/5yM9pRw87kfQ/+zQuHpguoXSGkUv0kSID 88kUGlNxy1kkTsSYG2UTKLmLDPuUGOUDGaNUzD+J49MogSLTmvHUIYNs0jFmpLyhVoTtSi/I VQQpHyk9ucAZd2OLxChm3RBJhAbmGw3rhUxx6B8SHwcBcJDttGyYF2GZj9AYAGlU/Fm1Itoi NwJD0vQnSZ//25l+XJehpeeixsqydj00gksHWEFaIEgCYyC6JfmGS4HtuUcv76vc2vLCv5aH hJVHHKGs+kiKJ2+r7bCNwvW0doVePdByzjgEZyd/yxIKKwYBBAGXVQEFAQEHQCVxoiHOlsEo NDKGCbxg4nL3E1CV0MRQCU1hPowd77h3AwEIB8LBfAQYAQoAJgIbDBYhBHVzVtd5u7iIdz5B XnNszfnvUb2XBQJoh9HXBQkB4YUCAAoJEHNszfnvUb2XgvAP+gIIKR3KatmwuUcla1RN6tUc 0Ae9eqS1cbSEDj8a14fnvUHtlCEO5g4m2PvPn7L2o7047ppl5100+zGMocXWslnDFJJVeAOp xzlhZ48DFMxkZkjtLY2fRrj1tOtzrTRikV0/UsaVs9tMPMEsVu/FH0exMoNELcqEVUgcRRpd XYXC9zgDUcM4+JRH8hDOiC51JRvdkXcokAXphuCY3J996i8Ph+kg6xMqscePscvvltR68jcT HHDOiOQtzjJRKQ6BHUzYdIRixcq210sabfZGJVT+7BfHI5qiUwfoG3DXSJygviN3I/EfnSbD 6T0Ccv/G6wQPHO4Vyn+egrMOU/HUrCKuq/b0rYvI8pTtRWAxIHkFZoKVB8I8Rl8+riGiEUAh Ja0bU4iOg7vR5Bm8Gt/tR6KjClyBI5NN1M1haFgVXqZ3dsQDpBjivbDHbUsAXVsd00y0B4Ir 8muvII9eJOwbTyqcG9RJbflquPp+FPlgiy9pYj52PB0NwzLYqX0fOWU8IqQF3bWtdJIb4Zat XnfqYtJ/wCaJTU43N3+/TIdqNA4G3WbyRYsCnz/kkf1ARmxoq3r29dOl8OnNHEvB1+hBlNBk d+cLpsYdTxa63OpbNDpm/unX1sEpOYy04dL5Y8B1Xbh+rQFNySq4Ani2dl5N1OsrjgzZ+wkl k2wOTWzl7wFH --------------bDF0cTK0hNvO7bGVyWlwA3oq Content-Type: multipart/mixed; boundary="------------Sm83Tphpb4X8gVQLVZGsvfcY" --------------Sm83Tphpb4X8gVQLVZGsvfcY Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable On 9/25/25 05:55, Alyssa Ross wrote: > Yureka Lilian writes: >=20 >> The xdp-forwarder's purpose is implementing the functionality needed >> within the net-vm (a VM running the Linux drivers for any physical >> interfaces on the spectrum system). >> >> In the future, the net-vm will load the included XDP programs on the >> passed-through physical interfaces as well as the downstream virtio >> interface going into the router (recognized by its special MAC address= ). >> >> The net-vm needs to multiplex between the physical interfaces, as ther= e >> might be several interfaces in the same IOMMU-group. >> >> For this, the XDP program loaded on the physical interfaces >> (`prog_physical.o`) applies a VLAN tag corresponding to the interface = id >> and redirects the packets to the router interface (identified by the >> `router_iface` bpf map). In the other direction the XDP program loaded= on >> the router interface (`prog_router.o`) removes one layer of VLAN taggi= ng >> and redirects the packets to the interface read from the VLAN tag. >> >> The helper program `set_router_iface` is used to update the `router_if= ace` >> bpf map to point to the interface passed as argument to the program. >> >> Co-authored-by: Demi Marie Obenour >> Signed-off-by: Yureka Lilian >> Signed-off-by: Demi Marie Obenour >> --- >> pkgs/default.nix | 4 + >> release/checks/pkg-tests.nix | 1 + >> tools/default.nix | 21 +- >> tools/meson.build | 4 + >> tools/meson_options.txt | 3 + >> tools/xdp-forwarder/meson.build | 48 +++++ >> tools/xdp-forwarder/parsing_helpers.h | 274 ++++++++++++++++++++++++= + >> tools/xdp-forwarder/prog_physical.c | 39 ++++ >> tools/xdp-forwarder/prog_router.c | 42 ++++ >> tools/xdp-forwarder/rewrite_helpers.h | 146 +++++++++++++ >> tools/xdp-forwarder/set_router_iface.c | 30 +++ >> 11 files changed, 608 insertions(+), 4 deletions(-) >> create mode 100644 tools/xdp-forwarder/meson.build >> create mode 100644 tools/xdp-forwarder/parsing_helpers.h >> create mode 100644 tools/xdp-forwarder/prog_physical.c >> create mode 100644 tools/xdp-forwarder/prog_router.c >> create mode 100644 tools/xdp-forwarder/rewrite_helpers.h >> create mode 100644 tools/xdp-forwarder/set_router_iface.c >> >> diff --git a/pkgs/default.nix b/pkgs/default.nix >> index 2472218..df3cfdc 100644 >> --- a/pkgs/default.nix >> +++ b/pkgs/default.nix >> @@ -42,6 +42,10 @@ let >> appSupport =3D false; >> hostSupport =3D true; >> }; >> + spectrum-driver-tools =3D self.callSpectrumPackage ../tools { >> + appSupport =3D false; >> + driverSupport =3D true; >> + }; >> xdg-desktop-portal-spectrum-host =3D >> self.callSpectrumPackage ../tools/xdg-desktop-portal-spectrum-h= ost {}; >> =20 >> diff --git a/release/checks/pkg-tests.nix b/release/checks/pkg-tests.n= ix >> index d7be42b..b1a048f 100644 >> --- a/release/checks/pkg-tests.nix >> +++ b/release/checks/pkg-tests.nix >> @@ -14,5 +14,6 @@ import ../../lib/call-package.nix ( >> tools =3D lib.recurseIntoAttrs (callSpectrumPackage ../../tools { >> appSupport =3D true; >> hostSupport =3D true; >> + driverSupport =3D true; >> }).tests; >> }) (_: {}) >> diff --git a/tools/default.nix b/tools/default.nix >> index 201afae..0e43997 100644 >> --- a/tools/default.nix >> +++ b/tools/default.nix >> @@ -1,13 +1,17 @@ >> # SPDX-License-Identifier: MIT >> # SPDX-FileCopyrightText: 2022-2025 Alyssa Ross >> +# SPDX-FileCopyrightText: 2025 Yureka Lilian >> =20 >> import ../lib/call-package.nix ( >> { src, lib, stdenv, fetchCrate, fetchurl, runCommand, buildPackages >> , meson, ninja, pkg-config, rustc >> , clang-tools, clippy >> , dbus >> +# clang 19 (current nixpkgs default) is too old to support -fwrapv-po= inter >> +, clang_21, libbpf >> , appSupport ? true >> , hostSupport ? false >> +, driverSupport ? false >> }: >> =20 >> let >> @@ -70,15 +74,18 @@ stdenv.mkDerivation (finalAttrs: { >> ./lsvm >> ./start-vmm >> ./subprojects >> + ] ++ lib.optionals driverSupport [ >> + ./xdp-forwarder >> ])); >> }; >> sourceRoot =3D "source/tools"; >> =20 >> depsBuildBuild =3D lib.optionals hostSupport [ buildPackages.stdenv= =2Ecc ]; >> nativeBuildInputs =3D [ meson ninja ] >> - ++ lib.optionals appSupport [ pkg-config ] >> - ++ lib.optionals hostSupport [ rustc ]; >> - buildInputs =3D lib.optionals appSupport [ dbus ]; >> + ++ lib.optionals (appSupport || driverSupport) [ pkg-config ] >> + ++ lib.optionals hostSupport [ rustc ] >> + ++ lib.optionals driverSupport [ clang_21 ]; >> + buildInputs =3D lib.optionals appSupport [ dbus ] ++ lib.optionals = driverSupport [ libbpf ]; >> =20 >> postPatch =3D lib.optionals hostSupport (lib.concatMapStringsSep "\= n" (crate: '' >> mkdir -p subprojects/packagecache >> @@ -88,12 +95,16 @@ stdenv.mkDerivation (finalAttrs: { >> mesonFlags =3D [ >> (lib.mesonBool "app" appSupport) >> (lib.mesonBool "host" hostSupport) >> + (lib.mesonBool "driver" driverSupport) >> "-Dhostfsrootdir=3D/run/virtiofs/virtiofs0" >> "-Dtests=3Dfalse" >> "-Dunwind=3Dfalse" >> "-Dwerror=3Dtrue" >> ]; >> =20 >> + # Not supported for target bpf >> + hardeningDisable =3D lib.optionals driverSupport [ "zerocallusedreg= s" ]; >> + >> passthru.tests =3D { >> clang-tidy =3D finalAttrs.finalPackage.overrideAttrs ( >> { name, src, nativeBuildInputs ? [], ... }: >> @@ -105,7 +116,9 @@ stdenv.mkDerivation (finalAttrs: { >> fileset =3D lib.fileset.union (lib.fileset.fromSource src) = =2E./.clang-tidy; >> }; >> =20 >> - nativeBuildInputs =3D nativeBuildInputs ++ [ clang-tools ]; >> + # clang-tools needs to be before clang, otherwise it will not= use >> + # the Nix include path correctly and fail to find headers >> + nativeBuildInputs =3D [ clang-tools ] ++ nativeBuildInputs; >> =20 >> buildPhase =3D '' >> clang-tidy --warnings-as-errors=3D'*' ../**/*.c >> diff --git a/tools/meson.build b/tools/meson.build >> index e8b0cf2..059baeb 100644 >> --- a/tools/meson.build >> +++ b/tools/meson.build >> @@ -26,3 +26,7 @@ endif >> if get_option('app') >> subdir('xdg-desktop-portal-spectrum') >> endif >> + >> +if get_option('driver') >> + subdir('xdp-forwarder') >> +endif >> diff --git a/tools/meson_options.txt b/tools/meson_options.txt >> index fb520ae..7b46739 100644 >> --- a/tools/meson_options.txt >> +++ b/tools/meson_options.txt >> @@ -7,6 +7,9 @@ option('host', type : 'boolean', value : false, >> option('app', type : 'boolean', >> description : 'Build tools for Spectrum app VMs') >> =20 >> +option('driver', type : 'boolean', value : false, >> + description : 'Build tools for Spectrum driver VMs') >> + >> option('hostfsrootdir', type : 'string', value : '/run/host', >> description : 'Path where the virtio-fs provided by the host will b= e mounted') >> =20 >> diff --git a/tools/xdp-forwarder/meson.build b/tools/xdp-forwarder/mes= on.build >> new file mode 100644 >> index 0000000..9b70ce3 >> --- /dev/null >> +++ b/tools/xdp-forwarder/meson.build >> @@ -0,0 +1,48 @@ >> +# SPDX-License-Identifier: EUPL-1.2+ >> +# SPDX-FileCopyrightText: 2025 Yureka Lilian >> +# SPDX-FileCopyrightText: 2025 Demi Marie Obenour >> + >> +libbpf =3D dependency('libbpf', version : '1.6.2') >> + >> +executable('set-router-iface', 'set_router_iface.c', >> + dependencies : libbpf, >> + install : true) >> + >> +clang =3D find_program('clang', native: true) >> + >> +bpf_o_cmd =3D [ >> + clang.full_path(), >> + '-fno-stack-protector', >> + '-fno-strict-aliasing', >> + '-fwrapv', '-fwrapv-pointer', >> + '-Wall', >> + '-Wextra', >> + '-O2', >> + '-target', 'bpf', >> + '-I', meson.current_source_dir() + '/include', >> + '-g', >> + '-c', >> + '-o', '@OUTPUT@', >> + '-MD', >> + '-MP', >> + '-MF', '@DEPFILE@', >=20 > Demi: you suggested these arguments, but the Meson default is > -MD -MQ $out -MF $DEPFILE, as far as I can tell. >=20 > Why the difference? I didn't know of -MQ. -MP is almost certainly redundant. Go with what Meson recommended. >> + '--', >> + '@INPUT@', >> +] >> + >> +prog_router_o =3D custom_target( >> + input : 'prog_router.c', >> + output : 'prog_router.o', >> + depfile : 'prog_router.o.dep', >> + command : bpf_o_cmd, >> + install: true, >> + install_dir: 'lib/xdp') >> + >> +prog_physical_o =3D custom_target( >> + input : 'prog_physical.c', >> + output : 'prog_physical.o', >> + depfile : 'prog_physical.o.dep', >> + command : bpf_o_cmd, >> + install: true, >> + install_dir: 'lib/xdp') >> + --=20 Sincerely, Demi Marie Obenour (she/her/hers) --------------Sm83Tphpb4X8gVQLVZGsvfcY Content-Type: application/pgp-keys; name="OpenPGP_0xB288B55FFF9C22C1.asc" Content-Disposition: attachment; filename="OpenPGP_0xB288B55FFF9C22C1.asc" Content-Description: OpenPGP public key Content-Transfer-Encoding: quoted-printable -----BEGIN PGP PUBLIC KEY BLOCK----- xsFNBFp+A0oBEADffj6anl9/BHhUSxGTICeVl2tob7hPDdhHNgPR4C8xlYt5q49y B+l2nipdaq+4Gk6FZfqC825TKl7eRpUjMriwle4r3R0ydSIGcy4M6eb0IcxmuPYf 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