netdev - Re: [PATCH v3 bpf] bpf, test_run: fix &xdp_frame misplacement for LIVE

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Date:   Wed, 15 Feb 2023 10:04:51 -0800
From:   Martin KaFai Lau <martin.lau@...ux.dev>
To:     Alexander Lobakin <aleksander.lobakin@...el.com>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>
Cc:     Toke Høiland-Jørgensen <toke@...hat.com>,
        Song Liu <song@...nel.org>,
        Jesper Dangaard Brouer <hawk@...nel.org>,
        Jakub Kicinski <kuba@...nel.org>, bpf@...r.kernel.org,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 bpf] bpf, test_run: fix &xdp_frame misplacement for
 LIVE_FRAMES

On 2/15/23 7:21 AM, Alexander Lobakin wrote:
>   /* The maximum permissible size is: PAGE_SIZE - sizeof(struct xdp_page_head) -
> - * sizeof(struct skb_shared_info) - XDP_PACKET_HEADROOM = 3368 bytes
> + * sizeof(struct skb_shared_info) - XDP_PACKET_HEADROOM = 3408 bytes
>    */
> -#define MAX_PKT_SIZE 3368
> +#define MAX_PKT_SIZE 3408

s390 has a different cache line size:

https://lore.kernel.org/all/20230128000650.1516334-11-iii@linux.ibm.com/

The above s390 fix is in bpf-next. It is better to target this patch for 
bpf-next also such that the CI can test it in s390.