netdev - Re: [RFC PATCH net-next 04/15] bpf: Sample bpf program to set SYN/SYN-ACK RTOs

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Date:   Tue, 13 Jun 2017 17:13:37 -0400 (EDT)
From:   David Miller <davem@...emloft.net>
To:     brakmo@...com
Cc:     netdev@...r.kernel.org, kernel-team@...com, bmatheny@...com,
        ast@...com, daniel@...earbox.net, dsa@...ulusnetworks.com
Subject: Re: [RFC PATCH net-next 04/15] bpf: Sample bpf program to set
 SYN/SYN-ACK RTOs

From: Lawrence Brakmo <brakmo@...com>
Date: Tue, 13 Jun 2017 10:59:53 -0700

> +
> +	// Check for TIMEOUT_INIT operation and IPv6 addresses
> +	if (op == BPF_SOCKET_OPS_TIMEOUT_INIT &&
> +		skops->family == AF_INET6) {
> +
> +		// If the first 5.5 bytes of the IPv6 address are the same
> +		// then both hosts are in the same datacenter
> +		// so use an RTO of 10ms
> +		if (skops->local_ip6[0] == skops->remote_ip6[0] &&
> +		    (skops->local_ip6[1] & 0xfff00000) ==
> +		    (skops->remote_ip6[1] & 0xfff00000))
> +			rv = 10;
> +	}

I know this is just a sample program, but please do not use C++ comments
in C code.

Thank you.