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[79.183.72.147]) by smtp.gmail.com with ESMTPSA id z63sm4885315wme.8.2021.01.12.11.41.51 (version=TLS1_2 cipher=ECDHE-ECDSA-CHACHA20-POLY1305 bits=256/256); Tue, 12 Jan 2021 11:41:54 -0800 (PST) From: Yuri Benditovich To: davem@davemloft.net, kuba@kernel.org, mst@redhat.com, jasowang@redhat.com, ast@kernel.org, daniel@iogearbox.net, andrii@kernel.org, kafai@fb.com, songliubraving@fb.com, yhs@fb.com, john.fastabend@gmail.com, kpsingh@kernel.org, rdunlap@infradead.org, willemb@google.com, gustavoars@kernel.org, herbert@gondor.apana.org.au, steffen.klassert@secunet.com, nogikh@google.com, pablo@netfilter.org, decui@microsoft.com, cai@lca.pw, jakub@cloudflare.com, elver@google.com, pabeni@redhat.com, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, kvm@vger.kernel.org, virtualization@lists.linux-foundation.org, bpf@vger.kernel.org Cc: yan@daynix.com Subject: [RFC PATCH 0/7] Support for virtio-net hash reporting Date: Tue, 12 Jan 2021 21:41:36 +0200 Message-Id: <20210112194143.1494-1-yuri.benditovich@daynix.com> X-Mailer: git-send-email 2.17.1 Precedence: bulk List-ID: X-Mailing-List: bpf@vger.kernel.org X-Patchwork-State: RFC Existing TUN module is able to use provided "steering eBPF" to calculate per-packet hash and derive the destination queue to place the packet to. The eBPF uses mapped configuration data containing a key for hash calculation and indirection table with array of queues' indices. This series of patches adds support for virtio-net hash reporting feature as defined in virtio specification. It extends the TUN module and the "steering eBPF" as follows: Extended steering eBPF calculates the hash value and hash type, keeps hash value in the skb->hash and returns index of destination virtqueue and the type of the hash. TUN module keeps returned hash type in (currently unused) field of the skb. skb->__unused renamed to 'hash_report_type'. When TUN module is called later to allocate and fill the virtio-net header and push it to destination virtqueue it populates the hash and the hash type into virtio-net header. VHOST driver is made aware of respective virtio-net feature that extends the virtio-net header to report the hash value and hash report type. Yuri Benditovich (7): skbuff: define field for hash report type vhost: support for hash report virtio-net feature tun: allow use of BPF_PROG_TYPE_SCHED_CLS program type tun: free bpf_program by bpf_prog_put instead of bpf_prog_destroy tun: add ioctl code TUNSETHASHPOPULATION tun: populate hash in virtio-net header when needed tun: report new tun feature IFF_HASH drivers/net/tun.c | 43 +++++++++++++++++++++++++++++++------ drivers/vhost/net.c | 37 ++++++++++++++++++++++++------- include/linux/skbuff.h | 7 +++++- include/uapi/linux/if_tun.h | 2 ++ 4 files changed, 74 insertions(+), 15 deletions(-)