Re: [PATCH 4/4] drivers/net/virtio_net: Added RSS hash report control.
From: Jason Wang
Date: Mon Jan 10 2022 - 23:33:10 EST
在 2022/1/10 上午5:06, Andrew Melnychenko 写道:
Now it's possible to control supported hashflows.
Also added hashflow set/get callbacks.
Also, disabling RXH_IP_SRC/DST for TCP would disable then 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@xxxxxxxxxx>
---
drivers/net/virtio_net.c | 159 +++++++++++++++++++++++++++++++++++++++
1 file changed, 159 insertions(+)
diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
index 6e7461b01f87..1b8dd384483c 100644
--- a/drivers/net/virtio_net.c
+++ b/drivers/net/virtio_net.c
@@ -235,6 +235,7 @@ struct virtnet_info {
u8 rss_key_size;
u16 rss_indir_table_size;
u32 rss_hash_types_supported;
+ u32 rss_hash_types_saved;
/* Has control virtqueue */
bool has_cvq;
@@ -2275,6 +2276,7 @@ static void virtnet_init_default_rss(struct virtnet_info *vi)
int i = 0;
vi->ctrl->rss.table_info.hash_types = vi->rss_hash_types_supported;
+ vi->rss_hash_types_saved = vi->rss_hash_types_supported;
vi->ctrl->rss.table_info.indirection_table_mask = vi->rss_indir_table_size - 1;
vi->ctrl->rss.table_info.unclassified_queue = 0;
@@ -2289,6 +2291,131 @@ static void virtnet_init_default_rss(struct virtnet_info *vi)
netdev_rss_key_fill(vi->ctrl->rss.key, vi->rss_key_size);
}
+static 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;
+ }
+}
+
+static 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;
This seems not filter out all the combinations:
e.g RXH_VLAN with port hash?
+
+ 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;
Any way to merge the two switch? The code is hard to be reviewed anyhow.
+ 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)
@@ -2574,6 +2701,27 @@ static int virtnet_get_rxnfc(struct net_device *dev, struct ethtool_rxnfc *info,
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;
@@ -2602,6 +2750,7 @@ 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)
@@ -2854,6 +3003,16 @@ static int virtnet_set_features(struct net_device *dev,
vi->guest_offloads = offloads;
}
+ if ((dev->features ^ features) & NETIF_F_RXHASH) {
+ if (features & NETIF_F_RXHASH)
+ vi->ctrl->rss.table_info.hash_types = vi->rss_hash_types_saved;
+ else
+ vi->ctrl->rss.table_info.hash_types = 0;
I think it's better to use VIRTIO_NET_HASH_REPORT_NONE here.
Thanks
+
+ if (!virtnet_commit_rss_command(vi))
+ return -EINVAL;
+ }
+
return 0;
}