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Date: Wed, 9 Jun 2021 13:04:54 +0300 Message-Id: <20210609100457.142570-3-andrew@daynix.com> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20210609100457.142570-1-andrew@daynix.com> References: <20210609100457.142570-1-andrew@daynix.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable 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: none client-ip=2a00:1450:4864:20::12d; envelope-from=andrew@daynix.com; helo=mail-lf1-x12d.google.com X-Spam_score_int: -18 X-Spam_score: -1.9 X-Spam_bar: - X-Spam_report: (-1.9 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_NONE=0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: yan@daynix.com, qemu-devel@nongnu.org Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: fail (Header signature does not verify) Content-Type: text/plain; charset="utf-8" eBPF RSS program and maps now may be passed during initialization. Initially was implemented for libvirt to launch qemu without permissions. Signed-off-by: Andrew Melnychenko --- hw/net/virtio-net.c | 77 ++++++++++++++++++++++++++++++++-- include/hw/virtio/virtio-net.h | 1 + 2 files changed, 74 insertions(+), 4 deletions(-) diff --git a/hw/net/virtio-net.c b/hw/net/virtio-net.c index bd7958b9f0..0602b1772e 100644 --- a/hw/net/virtio-net.c +++ b/hw/net/virtio-net.c @@ -41,6 +41,7 @@ #include "sysemu/sysemu.h" #include "trace.h" #include "monitor/qdev.h" +#include "monitor/monitor.h" #include "hw/pci/pci.h" #include "net_rx_pkt.h" #include "hw/virtio/vhost.h" @@ -1223,14 +1224,81 @@ static void virtio_net_detach_epbf_rss(VirtIONet *n) virtio_net_attach_ebpf_to_backend(n->nic, -1); } =20 -static bool virtio_net_load_ebpf(VirtIONet *n) +static int virtio_net_get_ebpf_rss_fds(char *str, char *fds[], int nfds) { - if (!virtio_net_attach_ebpf_to_backend(n->nic, -1)) { - /* backend does't support steering ebpf */ + char *ptr =3D str; + char *cur =3D NULL; + size_t len =3D strlen(str); + int i =3D 0; + + for (; i < nfds && ptr < str + len;) { + cur =3D strchr(ptr, ':'); + + if (cur =3D=3D NULL) { + fds[i] =3D g_strdup(ptr); + } else { + fds[i] =3D g_strndup(ptr, cur - ptr); + } + + i++; + if (cur =3D=3D NULL) { + break; + } else { + ptr =3D cur + 1; + } + } + + return i; +} + +static bool virtio_net_load_ebpf_fds(VirtIONet *n) +{ + char *fds_strs[EBPF_RSS_MAX_FDS]; + int fds[EBPF_RSS_MAX_FDS]; + int nfds; + int ret =3D false; + Error *errp; + int i =3D 0; + + if (n =3D=3D NULL || !n->ebpf_rss_fds) { return false; } =20 - return ebpf_rss_load(&n->ebpf_rss); + nfds =3D virtio_net_get_ebpf_rss_fds(n->ebpf_rss_fds, + fds_strs, EBPF_RSS_MAX_FDS); + for (i =3D 0; i < nfds; i++) { + fds[i] =3D monitor_fd_param(monitor_cur(), fds_strs[i], &errp); + } + + if (nfds =3D=3D EBPF_RSS_MAX_FDS) { + ret =3D ebpf_rss_load_fds(&n->ebpf_rss, fds[0], fds[1], fds[2], fd= s[3]); + } + + if (!ret) { + for (i =3D 0; i < nfds; i++) { + close(fds[i]); + } + } + + for (i =3D 0; i < nfds; i++) { + g_free(fds_strs[i]); + } + + return ret; +} + +static bool virtio_net_load_ebpf(VirtIONet *n) +{ + bool ret =3D true; + + if (virtio_net_attach_ebpf_to_backend(n->nic, -1)) { + if (!(n->ebpf_rss_fds + && virtio_net_load_ebpf_fds(n))) { + ret =3D ebpf_rss_load(&n->ebpf_rss); + } + } + + return ret; } =20 static void virtio_net_unload_ebpf(VirtIONet *n) @@ -3605,6 +3673,7 @@ static Property virtio_net_properties[] =3D { VIRTIO_NET_F_RSS, false), DEFINE_PROP_BIT64("hash", VirtIONet, host_features, VIRTIO_NET_F_HASH_REPORT, false), + DEFINE_PROP_STRING("ebpf_rss_fds", VirtIONet, ebpf_rss_fds), DEFINE_PROP_BIT64("guest_rsc_ext", VirtIONet, host_features, VIRTIO_NET_F_RSC_EXT, false), DEFINE_PROP_UINT32("rsc_interval", VirtIONet, rsc_timeout, diff --git a/include/hw/virtio/virtio-net.h b/include/hw/virtio/virtio-net.h index 824a69c23f..993f2f3036 100644 --- a/include/hw/virtio/virtio-net.h +++ b/include/hw/virtio/virtio-net.h @@ -213,6 +213,7 @@ struct VirtIONet { VirtioNetRssData rss_data; struct NetRxPkt *rx_pkt; struct EBPFRSSContext ebpf_rss; + char *ebpf_rss_fds; }; =20 void virtio_net_set_netclient_name(VirtIONet *n, const char *name, --=20 2.31.1