Subject: Re: [PATCH RFC net-next v2 5/8] cadence: macb: add XDP support for gem

From: Théo Lebrun <[email-masked]>
Date: Thu, 08 Jan 2026 16:49:45 +0100

Hello Paolo, netdev,

On Sun Dec 21, 2025 at 12:51 AM CET, Paolo Valerio wrote:
> Introduce basic XDP support for macb/gem with the XDP_PASS,
> XDP_DROP, XDP_REDIRECT verdict support.
>
> Signed-off-by: Paolo Valerio <[email-masked]>
> ---
>  drivers/net/ethernet/cadence/macb.h      |   3 +
>  drivers/net/ethernet/cadence/macb_main.c | 184 ++++++++++++++++++++---
>  2 files changed, 169 insertions(+), 18 deletions(-)
>
> diff --git a/drivers/net/ethernet/cadence/macb.h b/drivers/net/ethernet/cadence/macb.h
> index 45c04157f153..815d50574267 100644
> --- a/drivers/net/ethernet/cadence/macb.h
> +++ b/drivers/net/ethernet/cadence/macb.h
> @@ -16,6 +16,7 @@
>  #include <linux/workqueue.h>
>  #include <net/page_pool/helpers.h>
>  #include <net/xdp.h>
> +#include <linux/bpf_trace.h>

Shouldn't that land in macb_main.c? Required by trace_xdp_exception().

> diff --git a/drivers/net/ethernet/cadence/macb_main.c b/drivers/net/ethernet/cadence/macb_main.c
> index 582ceb728124..f767eb2e272e 100644
> --- a/drivers/net/ethernet/cadence/macb_main.c
> +++ b/drivers/net/ethernet/cadence/macb_main.c
> @@ -5,6 +5,7 @@
>   * Copyright (C) 2004-2006 Atmel Corporation
>   */
>  
> +#include <asm-generic/errno.h>

This is a mistake. For example compiling for a MIPS target I get all
errno constants redefined. Seeing where it was added it might have been
added by auto-import tooling.

If needed, to be replaced by
   #include <linux/errno.h>

⟩ git grep -h 'include.*errno' drivers/ | sort | uniq -c | sort -nr | head -n3
   1645 #include <linux/errno.h>
     19 #include <asm/errno.h>
      5 #include <linux/errno.h> /* For the -ENODEV/... values */

Thanks,

--
Théo Lebrun, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com