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a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1730189237; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=4ZjB3Af3Eu7jTZIe/vhr6IHTcD6ismi5yenfs4fh47Q=; b=OAZDNqlw5QGtI7P66fbx1+ncMWK999KyGvpuKRwLgYnL9MUsREXewESbfrtZdg0A71xPlU /+Zcnp7D9XzXLNIZHdkdn/Z8/a0ZPI2qcMwsS255zavl5msvYN1R+8Ai7/5NPoIupm6EBu aPB5UGvfwCL/ZFE9PQvi2vilhODlaQI= X-MC-Unique: _9t5xDVFPZ-mOBR7Ad9T-w-1 From: Jason Wang To: qemu-devel@nongnu.org Cc: =?UTF-8?q?Daniel=20P=2E=20Berrang=C3=A9?= , Jason Wang Subject: [PULL 01/14] net: fix build when libbpf is disabled, but libxdp is enabled Date: Tue, 29 Oct 2024 16:06:52 +0800 Message-ID: <20241029080705.3238-2-jasowang@redhat.com> In-Reply-To: <20241029080705.3238-1-jasowang@redhat.com> References: <20241029080705.3238-1-jasowang@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable X-Scanned-By: MIMEDefang 3.0 on 10.30.177.15 Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=170.10.133.124; envelope-from=jasowang@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -24 X-Spam_score: -2.5 X-Spam_bar: -- X-Spam_report: (-2.5 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.373, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H3=0.001, RCVD_IN_MSPIKE_WL=0.001, RCVD_IN_VALIDITY_RPBL_BLOCKED=0.001, RCVD_IN_VALIDITY_SAFE_BLOCKED=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @redhat.com) X-ZM-MESSAGEID: 1730189324779116600 From: Daniel P. Berrang=C3=A9 The net/af-xdp.c code is enabled when the libxdp library is present, however, it also has direct API calls to bpf_xdp_query_id & bpf_xdp_detach which are provided by the libbpf library. As a result if building with --disable-libbpf, but libxdp gets auto-detected, we'll fail to link QEMU /usr/bin/ld: libcommon.a.p/net_af-xdp.c.o: undefined reference to symbol = 'bpf_xdp_query_id@@LIBBPF_0.7.0' There are two bugs here * Since we have direct libbpf API calls, when building net/af-xdp.c, we must tell meson that libbpf is a dependancy, so that we directly link to it, rather than relying on indirect linkage. * When must skip probing for libxdp at all, when libbpf is not found, raising an error if --enable-libxdp was given explicitly. Fixes: cb039ef3d9e3112da01e1ecd9b136ac9809ef733 Signed-off-by: Daniel P. Berrang=C3=A9 Signed-off-by: Jason Wang --- meson.build | 10 ++++++++-- net/meson.build | 2 +- 2 files changed, 9 insertions(+), 3 deletions(-) diff --git a/meson.build b/meson.build index c26c417de1..9432c5f173 100644 --- a/meson.build +++ b/meson.build @@ -2164,8 +2164,14 @@ endif # libxdp libxdp =3D not_found if not get_option('af_xdp').auto() or have_system - libxdp =3D dependency('libxdp', required: get_option('af_xdp'), - version: '>=3D1.4.0', method: 'pkg-config') + if libbpf.found() + libxdp =3D dependency('libxdp', required: get_option('af_xdp'), + version: '>=3D1.4.0', method: 'pkg-config') + else + if get_option('af_xdp').enabled() + error('libxdp requested, but libbpf is not available') + endif + endif endif =20 # libdw diff --git a/net/meson.build b/net/meson.build index e0cd71470e..bb97b4dcbe 100644 --- a/net/meson.build +++ b/net/meson.build @@ -39,7 +39,7 @@ if have_netmap system_ss.add(files('netmap.c')) endif =20 -system_ss.add(when: libxdp, if_true: files('af-xdp.c')) +system_ss.add(when: [libxdp, libbpf], if_true: files('af-xdp.c')) =20 if have_vhost_net_user system_ss.add(when: 'CONFIG_VIRTIO_NET', if_true: files('vhost-user.c'),= if_false: files('vhost-user-stub.c')) --=20 2.42.0