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[79.177.42.131]) by smtp.gmail.com with ESMTPSA id b21sm3930520wmd.37.2020.02.26.09.48.18 (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Wed, 26 Feb 2020 09:48:19 -0800 (PST) From: Yuri Benditovich To: qemu-devel@nongnu.org, mst@redhat.com, jasowang@redhat.com Subject: [PATCH 3/3] virtio-net: implement RX RSS processing Date: Wed, 26 Feb 2020 19:48:09 +0200 Message-Id: <20200226174809.9675-4-yuri.benditovich@daynix.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20200226174809.9675-1-yuri.benditovich@daynix.com> References: <20200226174809.9675-1-yuri.benditovich@daynix.com> X-detected-operating-system: by eggs.gnu.org: Genre and OS details not recognized. X-Received-From: 2a00:1450:4864:20::343 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 Errors-To: qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Sender: "Qemu-devel" If VIRTIO_NET_F_RSS negotiated and RSS is enabled, process incoming packets, calculate packet's hash and place the packet into respective RX virtqueue. Signed-off-by: Yuri Benditovich --- hw/net/virtio-net.c | 86 +++++++++++++++++++++++++++++++++- include/hw/virtio/virtio-net.h | 1 + 2 files changed, 85 insertions(+), 2 deletions(-) diff --git a/hw/net/virtio-net.c b/hw/net/virtio-net.c index c5d21675a9..adf7b88d7a 100644 --- a/hw/net/virtio-net.c +++ b/hw/net/virtio-net.c @@ -42,6 +42,7 @@ #include "trace.h" #include "monitor/qdev.h" #include "hw/pci/pci.h" +#include "net_rx_pkt.h" #define VIRTIO_NET_VM_VERSION 11 @@ -1515,8 +1516,78 @@ static int receive_filter(VirtIONet *n, const uint8_t *buf, int size) return 0; } +static uint8_t virtio_net_get_hash_type(bool isip4, + bool isip6, + bool isudp, + bool istcp, + uint32_t types) +{ + uint32_t mask; + if (isip4) { + if (istcp && (types & VIRTIO_NET_RSS_HASH_TYPE_TCPv4)) { + return NetPktRssIpV4Tcp; + } + if (isudp && (types & VIRTIO_NET_RSS_HASH_TYPE_UDPv4)) { + return NetPktRssIpV4Udp; + } + if (types & VIRTIO_NET_RSS_HASH_TYPE_IPv4) { + return NetPktRssIpV4; + } + } else if (isip6) { + mask = VIRTIO_NET_RSS_HASH_TYPE_TCP_EX | VIRTIO_NET_RSS_HASH_TYPE_TCPv6; + if (istcp && (types & mask)) { + return (types & VIRTIO_NET_RSS_HASH_TYPE_TCP_EX) ? + NetPktRssIpV6TcpEx : NetPktRssIpV6Tcp; + } + mask = VIRTIO_NET_RSS_HASH_TYPE_UDP_EX | VIRTIO_NET_RSS_HASH_TYPE_UDPv6; + if (isudp && (types & mask)) { + return (types & VIRTIO_NET_RSS_HASH_TYPE_UDP_EX) ? + NetPktRssIpV6UdpEx : NetPktRssIpV6Udp; + } + mask = VIRTIO_NET_RSS_HASH_TYPE_IP_EX | VIRTIO_NET_RSS_HASH_TYPE_IPv6; + if (types & mask) { + return (types & VIRTIO_NET_RSS_HASH_TYPE_IP_EX) ? + NetPktRssIpV6Ex : NetPktRssIpV6; + } + } + return 0xff; +} + +static int virtio_net_process_rss(NetClientState *nc, const uint8_t *buf, + size_t size) +{ + VirtIONet *n = qemu_get_nic_opaque(nc); + unsigned int index = nc->queue_index, new_index; + struct NetRxPkt *pkt = n->rss_data.pkt; + uint8_t net_hash_type; + uint32_t hash; + bool isip4, isip6, isudp, istcp; + net_rx_pkt_set_protocols(pkt, buf + n->host_hdr_len, + size - n->host_hdr_len); + net_rx_pkt_get_protocols(pkt, &isip4, &isip6, &isudp, &istcp); + if (isip4 && (net_rx_pkt_get_ip4_info(pkt)->fragment)) { + istcp = isudp = false; + } + if (isip6 && (net_rx_pkt_get_ip6_info(pkt)->fragment)) { + istcp = isudp = false; + } + net_hash_type = virtio_net_get_hash_type(isip4, isip6, isudp, istcp, + n->rss_data.hash_types); + if (net_hash_type > NetPktRssIpV6UdpEx) { + return n->rss_data.default_queue; + } + + hash = net_rx_pkt_calc_rss_hash(pkt, net_hash_type, n->rss_data.key); + new_index = hash & (n->rss_data.indirections_len - 1); + new_index = n->rss_data.indirections[new_index]; + if (index == new_index) { + return -1; + } + return new_index; +} + static ssize_t virtio_net_receive_rcu(NetClientState *nc, const uint8_t *buf, - size_t size) + size_t size, bool no_rss) { VirtIONet *n = qemu_get_nic_opaque(nc); VirtIONetQueue *q = virtio_net_get_subqueue(nc); @@ -1530,6 +1601,14 @@ static ssize_t virtio_net_receive_rcu(NetClientState *nc, const uint8_t *buf, return -1; } + if (!no_rss && n->rss_data.enabled) { + int index = virtio_net_process_rss(nc, buf, size); + if (index >= 0) { + NetClientState *nc2 = qemu_get_subqueue(n->nic, index); + return virtio_net_receive_rcu(nc2, buf, size, true); + } + } + /* hdr_len refers to the header we supply to the guest */ if (!virtio_net_has_buffers(q, size + n->guest_hdr_len - n->host_hdr_len)) { return 0; @@ -1624,7 +1703,7 @@ static ssize_t virtio_net_do_receive(NetClientState *nc, const uint8_t *buf, { RCU_READ_LOCK_GUARD(); - return virtio_net_receive_rcu(nc, buf, size); + return virtio_net_receive_rcu(nc, buf, size, false); } static void virtio_net_rsc_extract_unit4(VirtioNetRscChain *chain, @@ -3200,6 +3279,8 @@ static void virtio_net_device_realize(DeviceState *dev, Error **errp) QTAILQ_INIT(&n->rsc_chains); n->qdev = dev; + + net_rx_pkt_init(&n->rss_data.pkt, false); } static void virtio_net_device_unrealize(DeviceState *dev, Error **errp) @@ -3236,6 +3317,7 @@ static void virtio_net_device_unrealize(DeviceState *dev, Error **errp) g_free(n->vqs); qemu_del_nic(n->nic); virtio_net_rsc_cleanup(n); + net_rx_pkt_uninit(n->rss_data.pkt); virtio_cleanup(vdev); } diff --git a/include/hw/virtio/virtio-net.h b/include/hw/virtio/virtio-net.h index cf16f5192e..45670dd054 100644 --- a/include/hw/virtio/virtio-net.h +++ b/include/hw/virtio/virtio-net.h @@ -209,6 +209,7 @@ struct VirtIONet { uint16_t indirections[VIRTIO_NET_RSS_MAX_TABLE_LEN]; uint16_t indirections_len; uint16_t default_queue; + struct NetRxPkt *pkt; } rss_data; };