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[79.183.72.147]) by smtp.gmail.com with ESMTPSA id z63sm4885315wme.8.2021.01.12.11.42.10 (version=TLS1_2 cipher=ECDHE-ECDSA-CHACHA20-POLY1305 bits=256/256); Tue, 12 Jan 2021 11:42:13 -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 6/7] tun: populate hash in virtio-net header when needed Date: Tue, 12 Jan 2021 21:41:42 +0200 Message-Id: <20210112194143.1494-7-yuri.benditovich@daynix.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20210112194143.1494-1-yuri.benditovich@daynix.com> References: <20210112194143.1494-1-yuri.benditovich@daynix.com> Precedence: bulk List-ID: X-Mailing-List: bpf@vger.kernel.org If the BPF program populated the hash in the skb the tun propagates the hash value and hash report type to the respective fields of virtio-net header. Signed-off-by: Yuri Benditovich --- drivers/net/tun.c | 25 ++++++++++++++++++++++--- 1 file changed, 22 insertions(+), 3 deletions(-) diff --git a/drivers/net/tun.c b/drivers/net/tun.c index 45f4f04a4a3e..214feb0b16fb 100644 --- a/drivers/net/tun.c +++ b/drivers/net/tun.c @@ -556,15 +556,20 @@ static u16 tun_ebpf_select_queue(struct tun_struct *tun, struct sk_buff *skb) { struct tun_prog *prog; u32 numqueues; - u16 ret = 0; + u32 ret = 0; numqueues = READ_ONCE(tun->numqueues); if (!numqueues) return 0; prog = rcu_dereference(tun->steering_prog); - if (prog) + if (prog) { ret = bpf_prog_run_clear_cb(prog->prog, skb); + if (tun->bpf_populates_hash) { + *skb_hash_report_type(skb) = (__u8)(ret >> 16); + ret &= 0xffff; + } + } return ret % numqueues; } @@ -2062,6 +2067,7 @@ static ssize_t tun_put_user(struct tun_struct *tun, if (vnet_hdr_sz) { struct virtio_net_hdr gso; + __u16 extra_copy = 0; if (iov_iter_count(iter) < vnet_hdr_sz) return -EINVAL; @@ -2085,7 +2091,20 @@ static ssize_t tun_put_user(struct tun_struct *tun, if (copy_to_iter(&gso, sizeof(gso), iter) != sizeof(gso)) return -EFAULT; - iov_iter_advance(iter, vnet_hdr_sz - sizeof(gso)); + if (tun->bpf_populates_hash && + vnet_hdr_sz >= sizeof(struct virtio_net_hdr_v1_hash)) { + struct virtio_net_hdr_v1_hash hdr; + + hdr.hdr.num_buffers = 0; + hdr.hash_value = cpu_to_le32(skb_get_hash(skb)); + hdr.hash_report = cpu_to_le16(*skb_hash_report_type(skb)); + hdr.padding = 0; + extra_copy = sizeof(hdr) - sizeof(gso); + if (copy_to_iter(&hdr.hdr.num_buffers, extra_copy, iter) != extra_copy) + return -EFAULT; + } + + iov_iter_advance(iter, vnet_hdr_sz - sizeof(gso) - extra_copy); } if (vlan_hlen) { -- 2.17.1