netdev - Re: [net-next,v3,04/13] ocetontx2-af: npc: cn20k: MKEX profile support

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Message-ID: <aWYYR6eDcY-0ByTY@rkannoth-OptiPlex-7090>
Date: Tue, 13 Jan 2026 15:32:47 +0530
From: Ratheesh Kannoth <rkannoth@...vell.com>
To: Jakub Kicinski <kuba@...nel.org>
CC: <netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [net-next,v3,04/13] ocetontx2-af: npc: cn20k: MKEX profile
 support

On 2026-01-11 at 04:29:32, Jakub Kicinski (kuba@...nel.org) wrote:
> This is an AI-generated review of your patch. The human sending this
> email has considered the AI review valid, or at least pausible.
>
> For local reproduction steps see https://netdev-ai.bots.linux.dev/ai-local.html
> ---
> ocetontx2-af: npc: cn20k: MKEX profile support
>
> This patch adds MKEX profile support for the cn20k silicon variant,
> introducing a new key extractor concept with up to 24 extractors per
> packet parsing profile.
>
> > diff --git a/drivers/net/ethernet/marvell/octeontx2/af/cn20k/npc.c b/drivers/net/ethernet/marvell/octeontx2/af/cn20k/npc.c
> > index 316e6cd1436a..88d7f65d246c 100644
> > --- a/drivers/net/ethernet/marvell/octeontx2/af/cn20k/npc.c
> > +++ b/drivers/net/ethernet/marvell/octeontx2/af/cn20k/npc.c
>
> [ ... ]
>
> > +void npc_cn20k_load_mkex_profile(struct rvu *rvu, int blkaddr,
> > +				 const char *mkex_profile)
> > +{
> > +	struct npc_mcam_kex_extr *mcam_kex_extr;
> > +	struct device *dev = &rvu->pdev->dev;
> > +	void __iomem *mkex_prfl_addr = NULL;
> > +	u64 prfl_sz;
> > +	int ret;
> > +
> > +	/* If user not selected mkex profile */
> > +	if (rvu->kpu_fwdata_sz ||
> > +	    !strncmp(mkex_profile, cn20k_def_pfl_name, MKEX_NAME_LEN))
> > +		goto program_mkex_extr;
> > +
> > +	/* Setting up the mapping for mkex profile image */
> > +	ret = npc_fwdb_prfl_img_map(rvu, &mkex_prfl_addr, &prfl_sz);
> > +	if (ret < 0)
> > +		goto program_mkex_extr;
> > +
> > +	mcam_kex_extr = (struct npc_mcam_kex_extr __force *)mkex_prfl_addr;
> > +
> > +	while (((s64)prfl_sz > 0) && (mcam_kex_extr->mkex_sign != MKEX_END_SIGN)) {
> > +		/* Compare with mkex mod_param name string */
> > +		if (mcam_kex_extr->mkex_sign == MKEX_CN20K_SIGN &&
> > +		    !strncmp(mcam_kex_extr->name, mkex_profile, MKEX_NAME_LEN)) {
> > +			rvu->kpu.mcam_kex_prfl.mkex_extr = mcam_kex_extr;
> > +			goto program_mkex_extr;
> > +		}
> > +
> > +		mcam_kex_extr++;
> > +		prfl_sz -= sizeof(struct npc_mcam_kex);
>                                  ^^^^^^^^^^^^^^^^^^^^^
>
> The loop iterates over struct npc_mcam_kex_extr entries (the pointer
> mcam_kex_extr is advanced by sizeof(struct npc_mcam_kex_extr) via
> mcam_kex_extr++), but the size decrement uses sizeof(struct npc_mcam_kex).
>
> These structures have different sizes:
> - struct npc_mcam_kex_extr contains intf_extr_lid[2][24] and
>   intf_extr_lt[2][24][16] arrays
> - struct npc_mcam_kex contains intf_lid_lt_ld[2][8][16][2] and
>   intf_ld_flags[2][2][16] arrays
>
> Should this be sizeof(struct npc_mcam_kex_extr) to match the pointer
> increment? Otherwise the loop termination condition will be incorrect
> and could read beyond the profile buffer boundaries.
ACK.
>
> > +	}
> > +	dev_warn(dev, "Failed to load requested profile: %s\n", mkex_profile);
>
> [ ... ]