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Date: Tue, 11 Jan 2022 12:05:51 +0800
From: Jason Wang <jasowang@...hat.com>
To: Andrew Melnychenko <andrew@...nix.com>, netdev@...r.kernel.org,
virtualization@...ts.linux-foundation.org,
linux-kernel@...r.kernel.org, davem@...emloft.net, kuba@...nel.org,
mst@...hat.com
Cc: yan@...nix.com, yuri.benditovich@...nix.com
Subject: Re: [PATCH 3/4] drivers/net/virtio_net: Added RSS hash report.
在 2022/1/10 上午5:06, Andrew Melnychenko 写道:
> Added features for RSS hash report.
> If hash is provided - it sets to skb.
> Added checks if rss and/or hash are enabled together.
>
> Signed-off-by: Andrew Melnychenko <andrew@...nix.com>
> ---
> drivers/net/virtio_net.c | 56 ++++++++++++++++++++++++++++++++++------
> 1 file changed, 48 insertions(+), 8 deletions(-)
>
> diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
> index 21794731fc75..6e7461b01f87 100644
> --- a/drivers/net/virtio_net.c
> +++ b/drivers/net/virtio_net.c
> @@ -231,6 +231,7 @@ struct virtnet_info {
>
> /* Host supports rss and/or hash report */
> bool has_rss;
> + bool has_rss_hash_report;
> u8 rss_key_size;
> u16 rss_indir_table_size;
> u32 rss_hash_types_supported;
> @@ -424,7 +425,9 @@ static struct sk_buff *page_to_skb(struct virtnet_info *vi,
> hdr_p = p;
>
> hdr_len = vi->hdr_len;
> - if (vi->mergeable_rx_bufs)
> + if (vi->has_rss_hash_report)
> + hdr_padded_len = sizeof(struct virtio_net_hdr_v1_hash);
> + else if (vi->mergeable_rx_bufs)
> hdr_padded_len = sizeof(*hdr);
> else
> hdr_padded_len = sizeof(struct padded_vnet_hdr);
> @@ -1160,6 +1163,8 @@ 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);
> @@ -1186,6 +1191,29 @@ static void receive_buf(struct virtnet_info *vi, struct receive_queue *rq,
> return;
>
> hdr = skb_vnet_hdr(skb);
> + if (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;
> @@ -2233,7 +2261,8 @@ static bool virtnet_commit_rss_command(struct virtnet_info *vi)
> sg_set_buf(&sgs[3], vi->ctrl->rss.key, sg_buf_size);
>
> if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MQ,
> - VIRTIO_NET_CTRL_MQ_RSS_CONFIG, sgs)) {
> + vi->has_rss ? VIRTIO_NET_CTRL_MQ_RSS_CONFIG
> + : VIRTIO_NET_CTRL_MQ_HASH_CONFIG, sgs)) {
> dev_warn(&dev->dev, "VIRTIONET issue with committing RSS sgs\n");
> return false;
> }
> @@ -3220,7 +3249,9 @@ static bool virtnet_validate_features(struct virtio_device *vdev)
> VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_MQ, "VIRTIO_NET_F_CTRL_VQ") ||
> VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_CTRL_MAC_ADDR,
> "VIRTIO_NET_F_CTRL_VQ") ||
> - VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_RSS, "VIRTIO_NET_F_RSS"))) {
> + VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_RSS, "VIRTIO_NET_F_RSS") ||
I think we should make RSS depend on CTRL_VQ.
> + VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_HASH_REPORT,
> + "VIRTIO_NET_F_HASH_REPORT"))) {
Need to depend on CTRL_VQ here.
> return false;
> }
>
> @@ -3355,6 +3386,12 @@ static int virtnet_probe(struct virtio_device *vdev)
> if (virtio_has_feature(vdev, VIRTIO_NET_F_MRG_RXBUF))
> vi->mergeable_rx_bufs = true;
>
> + if (virtio_has_feature(vdev, VIRTIO_NET_F_HASH_REPORT)) {
> + vi->has_rss_hash_report = true;
> + vi->rss_indir_table_size = 1;
> + vi->rss_key_size = VIRTIO_NET_RSS_MAX_KEY_SIZE;
Any reason to initialize RSS feature here not the init_default_rss()?
Thanks
> + }
> +
> if (virtio_has_feature(vdev, VIRTIO_NET_F_RSS)) {
> vi->has_rss = true;
> vi->rss_indir_table_size =
> @@ -3364,7 +3401,7 @@ static int virtnet_probe(struct virtio_device *vdev)
> virtio_cread8(vdev, offsetof(struct virtio_net_config, rss_max_key_size));
> }
>
> - if (vi->has_rss) {
> + 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 &=
> @@ -3374,8 +3411,11 @@ static int virtnet_probe(struct virtio_device *vdev)
>
> dev->hw_features |= NETIF_F_RXHASH;
> }
> - if (virtio_has_feature(vdev, VIRTIO_NET_F_MRG_RXBUF) ||
> - virtio_has_feature(vdev, VIRTIO_F_VERSION_1))
> +
> + if (vi->has_rss_hash_report)
> + vi->hdr_len = sizeof(struct virtio_net_hdr_v1_hash);
> + else if (virtio_has_feature(vdev, VIRTIO_NET_F_MRG_RXBUF) ||
> + virtio_has_feature(vdev, VIRTIO_F_VERSION_1))
> vi->hdr_len = sizeof(struct virtio_net_hdr_mrg_rxbuf);
> else
> vi->hdr_len = sizeof(struct virtio_net_hdr);
> @@ -3442,7 +3482,7 @@ static int virtnet_probe(struct virtio_device *vdev)
> }
> }
>
> - if (vi->has_rss) {
> + if (vi->has_rss || vi->has_rss_hash_report) {
> rtnl_lock();
> virtnet_init_default_rss(vi);
> rtnl_unlock();
> @@ -3580,7 +3620,7 @@ static struct virtio_device_id id_table[] = {
> VIRTIO_NET_F_CTRL_MAC_ADDR, \
> VIRTIO_NET_F_MTU, VIRTIO_NET_F_CTRL_GUEST_OFFLOADS, \
> VIRTIO_NET_F_SPEED_DUPLEX, VIRTIO_NET_F_STANDBY, \
> - VIRTIO_NET_F_RSS
> + VIRTIO_NET_F_RSS, VIRTIO_NET_F_HASH_REPORT
>
> static unsigned int features[] = {
> VIRTNET_FEATURES,
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