linux-kernel - [PATCH net-next 1/4] virtio_net: Split struct virtio_net_rss

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Message-Id: <20250318-virtio-v1-1-344caf336ddd@daynix.com>
Date: Tue, 18 Mar 2025 18:56:51 +0900
From: Akihiko Odaki <akihiko.odaki@...nix.com>
To: "Michael S. Tsirkin" <mst@...hat.com>, Jason Wang <jasowang@...hat.com>, 
 Xuan Zhuo <xuanzhuo@...ux.alibaba.com>, 
 Eugenio Pérez <eperezma@...hat.com>, 
 Andrew Lunn <andrew+netdev@...n.ch>, 
 "David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, 
 Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>, 
 Andrew Melnychenko <andrew@...nix.com>, Joe Damato <jdamato@...tly.com>, 
 Philo Lu <lulie@...ux.alibaba.com>
Cc: virtualization@...ts.linux.dev, linux-kernel@...r.kernel.org, 
 netdev@...r.kernel.org, devel@...nix.com, 
 Akihiko Odaki <akihiko.odaki@...nix.com>
Subject: [PATCH net-next 1/4] virtio_net: Split struct
 virtio_net_rss_config

struct virtio_net_rss_config was less useful in actual code because of a
flexible array placed in the middle. Add new structures that split it
into two to avoid having a flexible array in the middle.

Suggested-by: Jason Wang <jasowang@...hat.com>
Signed-off-by: Akihiko Odaki <akihiko.odaki@...nix.com>
---
 include/uapi/linux/virtio_net.h | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/include/uapi/linux/virtio_net.h b/include/uapi/linux/virtio_net.h
index ac9174717ef1..963540deae66 100644
--- a/include/uapi/linux/virtio_net.h
+++ b/include/uapi/linux/virtio_net.h
@@ -327,6 +327,19 @@ struct virtio_net_rss_config {
 	__u8 hash_key_data[/* hash_key_length */];
 };

+struct virtio_net_rss_config_hdr {
+	__le32 hash_types;
+	__le16 indirection_table_mask;
+	__le16 unclassified_queue;
+	__le16 indirection_table[/* 1 + indirection_table_mask */];
+};
+
+struct virtio_net_rss_config_trailer {
+	__le16 max_tx_vq;
+	__u8 hash_key_length;
+	__u8 hash_key_data[/* hash_key_length */];
+};
+
  #define VIRTIO_NET_CTRL_MQ_RSS_CONFIG          1

 /*

-- 
2.48.1