netdev - [RFC PATCH 1/7] skbuff: define field for hash report type

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Message-Id: <20210112194143.1494-2-yuri.benditovich@daynix.com>
Date:   Tue, 12 Jan 2021 21:41:37 +0200
From:   Yuri Benditovich <yuri.benditovich@...nix.com>
To:     davem@...emloft.net, kuba@...nel.org, mst@...hat.com,
        jasowang@...hat.com, ast@...nel.org, daniel@...earbox.net,
        andrii@...nel.org, kafai@...com, songliubraving@...com, yhs@...com,
        john.fastabend@...il.com, kpsingh@...nel.org,
        rdunlap@...radead.org, willemb@...gle.com, gustavoars@...nel.org,
        herbert@...dor.apana.org.au, steffen.klassert@...unet.com,
        nogikh@...gle.com, pablo@...filter.org, decui@...rosoft.com,
        cai@....pw, jakub@...udflare.com, elver@...gle.com,
        pabeni@...hat.com, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
        virtualization@...ts.linux-foundation.org, bpf@...r.kernel.org
Cc:     yan@...nix.com
Subject: [RFC PATCH 1/7] skbuff: define field for hash report type

Used by virtio-net receive side scaling

Signed-off-by: Yuri Benditovich <yuri.benditovich@...nix.com>
---
 include/linux/skbuff.h | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index 416bf95cd5f2..36cf40ec0259 100644
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -510,7 +510,7 @@ int skb_zerocopy_iter_stream(struct sock *sk, struct sk_buff *skb,
  * the end of the header data, ie. at skb->end.
  */
 struct skb_shared_info {
-	__u8		__unused;
+	__u8		hash_report_type; /* virtio-net rss */
 	__u8		meta_len;
 	__u8		nr_frags;
 	__u8		tx_flags;
@@ -1430,6 +1430,11 @@ static inline struct skb_shared_hwtstamps *skb_hwtstamps(struct sk_buff *skb)
 	return &skb_shinfo(skb)->hwtstamps;
 }
 
+static inline __u8 *skb_hash_report_type(struct sk_buff *skb)
+{
+	return &skb_shinfo(skb)->hash_report_type;
+}
+
 static inline struct ubuf_info *skb_zcopy(struct sk_buff *skb)
 {
 	bool is_zcopy = skb && skb_shinfo(skb)->tx_flags & SKBTX_DEV_ZEROCOPY;
-- 
2.17.1