netdev - Re: [PATCH bpf-next v1 1/3] bpf/xdp: Add bpf_load_hdr

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Message-ID: <20211001160133.50c5d143@kicinski-fedora-pc1c0hjn.dhcp.thefacebook.com>
Date:   Fri, 1 Oct 2021 16:01:33 -0700
From:   Jakub Kicinski <kuba@...nel.org>
To:     Song Liu <song@...nel.org>
Cc:     Joanne Koong <joannekoong@...com>, bpf <bpf@...r.kernel.org>,
        Martin KaFai Lau <kafai@...com>,
        Networking <netdev@...r.kernel.org>,
        Kernel Team <Kernel-team@...com>
Subject: Re: [PATCH bpf-next v1 1/3] bpf/xdp: Add bpf_load_hdr_opt support
 for xdp

On Fri, 1 Oct 2021 15:47:55 -0700 Song Liu wrote:
> > +       if (flags & 0xffffffffffff)  
> 
> Maybe use (1ULL << BPF_LOAD_HDR_OPT_TCP_OFFSET_SHIFT) - 1

Or GENMASK_ULL(47, 0) ?