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Message-Id: <20210818175440.128691-4-andrew@daynix.com>
Date: Wed, 18 Aug 2021 20:54:40 +0300
From: Andrew Melnychenko <andrew@...nix.com>
To: mst@...hat.com, jasowang@...hat.com, davem@...emloft.net,
kuba@...nel.org
Cc: virtualization@...ts.linux-foundation.org, netdev@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: [RFC PATCH 3/3] drivers/net/virtio_net: Added RSS hash report.
Added set_hash for skb.
Also added hashflow set/get callbacks.
Virtio RSS "IPv6 extensions" hashes disabled.
Also, disabling RXH_IP_SRC/DST for TCP would disable them for UDP.
TCP and UDP supports only:
ethtool -U eth0 rx-flow-hash tcp4 sd
RXH_IP_SRC + RXH_IP_DST
ethtool -U eth0 rx-flow-hash tcp4 sdfn
RXH_IP_SRC + RXH_IP_DST + RXH_L4_B_0_1 + RXH_L4_B_2_3
Signed-off-by: Andrew Melnychenko <andrew@...nix.com>
---
drivers/net/virtio_net.c | 177 +++++++++++++++++++++++++++++++++++++++
1 file changed, 177 insertions(+)
diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
index d87bde246305..6a52eeaf9292 100644
--- a/drivers/net/virtio_net.c
+++ b/drivers/net/virtio_net.c
@@ -1151,6 +1151,8 @@ static void receive_buf(struct virtnet_info *vi, struct receive_queue *rq,
struct net_device *dev = vi->dev;
struct sk_buff *skb;
struct virtio_net_hdr_mrg_rxbuf *hdr;
+ struct virtio_net_hdr_v1_hash *hdr_hash;
+ enum pkt_hash_types rss_hash_type;
if (unlikely(len < vi->hdr_len + ETH_HLEN)) {
pr_debug("%s: short packet %i\n", dev->name, len);
@@ -1177,6 +1179,29 @@ static void receive_buf(struct virtnet_info *vi, struct receive_queue *rq,
return;
hdr = skb_vnet_hdr(skb);
+ if (vi->has_rss_hash_report && (dev->features & NETIF_F_RXHASH)) {
+ hdr_hash = (struct virtio_net_hdr_v1_hash *)(hdr);
+
+ switch (hdr_hash->hash_report) {
+ case VIRTIO_NET_HASH_REPORT_TCPv4:
+ case VIRTIO_NET_HASH_REPORT_UDPv4:
+ case VIRTIO_NET_HASH_REPORT_TCPv6:
+ case VIRTIO_NET_HASH_REPORT_UDPv6:
+ case VIRTIO_NET_HASH_REPORT_TCPv6_EX:
+ case VIRTIO_NET_HASH_REPORT_UDPv6_EX:
+ rss_hash_type = PKT_HASH_TYPE_L4;
+ break;
+ case VIRTIO_NET_HASH_REPORT_IPv4:
+ case VIRTIO_NET_HASH_REPORT_IPv6:
+ case VIRTIO_NET_HASH_REPORT_IPv6_EX:
+ rss_hash_type = PKT_HASH_TYPE_L3;
+ break;
+ case VIRTIO_NET_HASH_REPORT_NONE:
+ default:
+ rss_hash_type = PKT_HASH_TYPE_NONE;
+ }
+ skb_set_hash(skb, hdr_hash->hash_value, rss_hash_type);
+ }
if (hdr->hdr.flags & VIRTIO_NET_HDR_F_DATA_VALID)
skb->ip_summed = CHECKSUM_UNNECESSARY;
@@ -2250,6 +2275,132 @@ static void virtnet_init_default_rss(struct virtnet_info *vi)
netdev_rss_key_fill(vi->ctrl->rss.key, vi->rss_key_size);
}
+void virtnet_get_hashflow(const struct virtnet_info *vi, struct ethtool_rxnfc *info)
+{
+ info->data = 0;
+ switch (info->flow_type) {
+ case TCP_V4_FLOW:
+ if (vi->rss_hash_types_saved & VIRTIO_NET_RSS_HASH_TYPE_TCPv4) {
+ info->data = RXH_IP_SRC | RXH_IP_DST |
+ RXH_L4_B_0_1 | RXH_L4_B_2_3;
+ } else if (vi->rss_hash_types_saved & VIRTIO_NET_RSS_HASH_TYPE_IPv4) {
+ info->data = RXH_IP_SRC | RXH_IP_DST;
+ }
+ break;
+ case TCP_V6_FLOW:
+ if (vi->rss_hash_types_saved & VIRTIO_NET_RSS_HASH_TYPE_TCPv6) {
+ info->data = RXH_IP_SRC | RXH_IP_DST |
+ RXH_L4_B_0_1 | RXH_L4_B_2_3;
+ } else if (vi->rss_hash_types_saved & VIRTIO_NET_RSS_HASH_TYPE_IPv6) {
+ info->data = RXH_IP_SRC | RXH_IP_DST;
+ }
+ break;
+ case UDP_V4_FLOW:
+ if (vi->rss_hash_types_saved & VIRTIO_NET_RSS_HASH_TYPE_UDPv4) {
+ info->data = RXH_IP_SRC | RXH_IP_DST |
+ RXH_L4_B_0_1 | RXH_L4_B_2_3;
+ } else if (vi->rss_hash_types_saved & VIRTIO_NET_RSS_HASH_TYPE_IPv4) {
+ info->data = RXH_IP_SRC | RXH_IP_DST;
+ }
+ break;
+ case UDP_V6_FLOW:
+ if (vi->rss_hash_types_saved & VIRTIO_NET_RSS_HASH_TYPE_UDPv6) {
+ info->data = RXH_IP_SRC | RXH_IP_DST |
+ RXH_L4_B_0_1 | RXH_L4_B_2_3;
+ } else if (vi->rss_hash_types_saved & VIRTIO_NET_RSS_HASH_TYPE_IPv6) {
+ info->data = RXH_IP_SRC | RXH_IP_DST;
+ }
+ break;
+ case IPV4_FLOW:
+ if (vi->rss_hash_types_saved & VIRTIO_NET_RSS_HASH_TYPE_IPv4)
+ info->data = RXH_IP_SRC | RXH_IP_DST;
+
+ break;
+ case IPV6_FLOW:
+ if (vi->rss_hash_types_saved & VIRTIO_NET_RSS_HASH_TYPE_IPv4)
+ info->data = RXH_IP_SRC | RXH_IP_DST;
+
+ break;
+ default:
+ info->data = 0;
+ break;
+ }
+}
+
+bool virtnet_set_hashflow(struct virtnet_info *vi, struct ethtool_rxnfc *info)
+{
+ u64 is_iphash = info->data & (RXH_IP_SRC | RXH_IP_DST);
+ u64 is_porthash = info->data & (RXH_L4_B_0_1 | RXH_L4_B_2_3);
+ u32 new_hashtypes = vi->rss_hash_types_saved;
+
+ if ((is_iphash && (is_iphash != (RXH_IP_SRC | RXH_IP_DST))) ||
+ (is_porthash && (is_porthash != (RXH_L4_B_0_1 | RXH_L4_B_2_3)))) {
+ return false;
+ }
+
+ if (!is_iphash && is_porthash)
+ return false;
+
+ switch (info->flow_type) {
+ case TCP_V4_FLOW:
+ case UDP_V4_FLOW:
+ case IPV4_FLOW:
+ new_hashtypes &= ~VIRTIO_NET_RSS_HASH_TYPE_IPv4;
+ if (is_iphash)
+ new_hashtypes |= VIRTIO_NET_RSS_HASH_TYPE_IPv4;
+
+ break;
+ case TCP_V6_FLOW:
+ case UDP_V6_FLOW:
+ case IPV6_FLOW:
+ new_hashtypes &= ~VIRTIO_NET_RSS_HASH_TYPE_IPv6;
+ if (is_iphash)
+ new_hashtypes |= VIRTIO_NET_RSS_HASH_TYPE_IPv6;
+
+ break;
+ default:
+ break;
+ }
+
+ switch (info->flow_type) {
+ case TCP_V4_FLOW:
+ new_hashtypes &= ~VIRTIO_NET_RSS_HASH_TYPE_TCPv4;
+ if (is_porthash)
+ new_hashtypes |= VIRTIO_NET_RSS_HASH_TYPE_TCPv4;
+
+ break;
+ case UDP_V4_FLOW:
+ new_hashtypes &= ~VIRTIO_NET_RSS_HASH_TYPE_UDPv4;
+ if (is_porthash)
+ new_hashtypes |= VIRTIO_NET_RSS_HASH_TYPE_UDPv4;
+
+ break;
+ case TCP_V6_FLOW:
+ new_hashtypes &= ~VIRTIO_NET_RSS_HASH_TYPE_TCPv6;
+ if (is_porthash)
+ new_hashtypes |= VIRTIO_NET_RSS_HASH_TYPE_TCPv6;
+
+ break;
+ case UDP_V6_FLOW:
+ new_hashtypes &= ~VIRTIO_NET_RSS_HASH_TYPE_UDPv6;
+ if (is_porthash)
+ new_hashtypes |= VIRTIO_NET_RSS_HASH_TYPE_UDPv6;
+
+ break;
+ default:
+ break;
+ }
+
+ if (new_hashtypes != vi->rss_hash_types_saved) {
+ vi->rss_hash_types_saved = new_hashtypes;
+ vi->ctrl->rss.table_info.hash_types = vi->rss_hash_types_saved;
+ if (vi->dev->features & NETIF_F_RXHASH)
+ return virtnet_commit_rss_command(vi);
+ }
+
+ return true;
+}
+
static void virtnet_get_drvinfo(struct net_device *dev,
struct ethtool_drvinfo *info)
{
@@ -2530,8 +2681,28 @@ int virtnet_get_rxnfc(struct net_device *dev, struct ethtool_rxnfc *info, u32 *r
switch (info->cmd) {
case ETHTOOL_GRXRINGS:
info->data = vi->curr_queue_pairs;
+ break;
+ case ETHTOOL_GRXFH:
+ virtnet_get_hashflow(vi, info);
+ break;
+ default:
rc = -EOPNOTSUPP;
}
+
+ return rc;
+}
+
+static int virtnet_set_rxnfc(struct net_device *dev, struct ethtool_rxnfc *info)
+{
+ struct virtnet_info *vi = netdev_priv(dev);
+ int rc = 0;
+
+ switch (info->cmd) {
+ case ETHTOOL_SRXFH:
+ if (!virtnet_set_hashflow(vi, info))
+ rc = -EINVAL;
+
+ break;
default:
rc = -EOPNOTSUPP;
}
@@ -2559,6 +2730,7 @@ static const struct ethtool_ops virtnet_ethtool_ops = {
.get_rxfh = virtnet_get_rxfh,
.set_rxfh = virtnet_set_rxfh,
.get_rxnfc = virtnet_get_rxnfc,
+ .set_rxnfc = virtnet_set_rxnfc,
};
static void virtnet_freeze_down(struct virtio_device *vdev)
@@ -3351,8 +3523,13 @@ static int virtnet_probe(struct virtio_device *vdev)
if (vi->has_rss || vi->has_rss_hash_report) {
vi->rss_hash_types_supported =
virtio_cread32(vdev, offsetof(struct virtio_net_config, supported_hash_types));
+ vi->rss_hash_types_supported &=
+ ~(VIRTIO_NET_RSS_HASH_TYPE_IP_EX |
+ VIRTIO_NET_RSS_HASH_TYPE_TCP_EX |
+ VIRTIO_NET_RSS_HASH_TYPE_UDP_EX);
dev->hw_features |= NETIF_F_RXHASH;
+ dev->features |= NETIF_F_NTUPLE;
}
if (vi->has_cvq && vi->has_rss_hash_report)
--
2.31.1
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