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Re: [PATCH v2 3/4] virtio-net: implement RX RSS processing
From: |
Michael S. Tsirkin |
Subject: |
Re: [PATCH v2 3/4] virtio-net: implement RX RSS processing |
Date: |
Tue, 10 Mar 2020 02:13:37 -0400 |
On Mon, Mar 09, 2020 at 10:34:37AM +0200, Yuri Benditovich wrote:
> 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 <address@hidden>
> ---
> 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 27071eccd2..abc41fdb16 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
>
> @@ -1610,8 +1611,78 @@ 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) {
An empty line after a declaration won't hurt, here and elsewhere.
> + 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;
Mask is only used on this path, move declaration within if ()?
> + 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);
> @@ -1625,6 +1696,14 @@ 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;
> @@ -1719,7 +1798,7 @@ 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,
> @@ -3295,6 +3374,8 @@ 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)
> @@ -3331,6 +3412,7 @@ 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;
> };
>
> --
> 2.17.1