netdev - [PATCH RFC v3 2/9] virtio_net: Add functions for hashing

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Message-ID: <20240916084619.581-1-gur.stavi@huawei.com>
Date: Mon, 16 Sep 2024 11:46:18 +0300
From: <gur.stavi@...wei.com>
To: <akihiko.odaki@...nix.com>
CC: <andrew@...nix.com>, <corbet@....net>, <davem@...emloft.net>,
	<edumazet@...gle.com>, <jasowang@...hat.com>, <kuba@...nel.org>,
	<kvm@...r.kernel.org>, <linux-doc@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, <linux-kselftest@...r.kernel.org>,
	<mst@...hat.com>, <netdev@...r.kernel.org>, <pabeni@...hat.com>,
	<shuah@...nel.org>, <virtualization@...ts.linux-foundation.org>,
	<willemdebruijn.kernel@...il.com>, <xuanzhuo@...ux.alibaba.com>,
	<yuri.benditovich@...nix.com>
Subject: [PATCH RFC v3 2/9] virtio_net: Add functions for hashing

> +
> +static inline bool virtio_net_hash_rss(const struct sk_buff *skb,
> +				       u32 types, const __be32 *key,
> +				       struct virtio_net_hash *hash)

Based on the guidelines, this function seems imperative rather than
predicate and should return an error-code integer.

https://www.kernel.org/doc/html/latest/process/coding-style.html#function-return-values-and-names

> +{
> +	u16 report;
> +	struct virtio_net_toeplitz_state toeplitz_state = {
> +		.key_buffer = be32_to_cpu(*key),
> +		.key = key
> +	};
> +	struct flow_keys flow;
> +
> +	if (!skb_flow_dissect_flow_keys(skb, &flow, 0))
> +		return false;
> +
> +	report = virtio_net_hash_report(types, flow.basic);
> +
> +	switch (report) {
> +	case VIRTIO_NET_HASH_REPORT_IPv4:
> +		virtio_net_toeplitz(&toeplitz_state,
> +				    (__be32 *)&flow.addrs.v4addrs,
> +				    sizeof(flow.addrs.v4addrs) / 4);
> +		break;
> +
> +	case VIRTIO_NET_HASH_REPORT_TCPv4:
> +		virtio_net_toeplitz(&toeplitz_state,
> +				    (__be32 *)&flow.addrs.v4addrs,
> +				    sizeof(flow.addrs.v4addrs) / 4);
> +		virtio_net_toeplitz(&toeplitz_state, &flow.ports.ports,
> +				    1);
> +		break;
> +
> +	case VIRTIO_NET_HASH_REPORT_UDPv4:
> +		virtio_net_toeplitz(&toeplitz_state,
> +				    (__be32 *)&flow.addrs.v4addrs,
> +				    sizeof(flow.addrs.v4addrs) / 4);
> +		virtio_net_toeplitz(&toeplitz_state, &flow.ports.ports,
> +				    1);
> +		break;
> +
> +	case VIRTIO_NET_HASH_REPORT_IPv6:
> +		virtio_net_toeplitz(&toeplitz_state,
> +				    (__be32 *)&flow.addrs.v6addrs,
> +				    sizeof(flow.addrs.v6addrs) / 4);
> +		break;
> +
> +	case VIRTIO_NET_HASH_REPORT_TCPv6:
> +		virtio_net_toeplitz(&toeplitz_state,
> +				    (__be32 *)&flow.addrs.v6addrs,
> +				    sizeof(flow.addrs.v6addrs) / 4);
> +		virtio_net_toeplitz(&toeplitz_state, &flow.ports.ports,
> +				    1);
> +		break;
> +
> +	case VIRTIO_NET_HASH_REPORT_UDPv6:
> +		virtio_net_toeplitz(&toeplitz_state,
> +				    (__be32 *)&flow.addrs.v6addrs,
> +				    sizeof(flow.addrs.v6addrs) / 4);
> +		virtio_net_toeplitz(&toeplitz_state, &flow.ports.ports,
> +				    1);
> +		break;
> +
> +	default:
> +		return false;
> +	}
> +
> +	hash->value = toeplitz_state.hash;
> +	hash->report = report;
> +
> +	return true;
> +}
> +