netdev - Re: [PATCH 3/3] net: mvpp2: parser fix PPPoE

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Date:   Wed, 15 Mar 2023 12:53:02 +0100
From:   Michal Swiatkowski <michal.swiatkowski@...ux.intel.com>
To:     Sven Auhagen <Sven.Auhagen@...eatech.de>
Cc:     netdev@...r.kernel.org, mw@...ihalf.com, linux@...linux.org.uk,
        kuba@...nel.org, davem@...emloft.net, maxime.chevallier@...tlin.com
Subject: Re: [PATCH 3/3] net: mvpp2: parser fix PPPoE

On Sat, Mar 11, 2023 at 08:10:24AM +0100, Sven Auhagen wrote:
> In PPPoE add all IPv4 header option length to the parser
> and adjust the L3 and L4 offset accordingly.
> Currently the L4 match does not work with PPPoE and
> all packets are matched as L3 IP4 OPT.
> 
> Signed-off-by: Sven Auhagen <sven.auhagen@...eatech.de>
> 
> diff --git a/drivers/net/ethernet/marvell/mvpp2/mvpp2_prs.c b/drivers/net/ethernet/marvell/mvpp2/mvpp2_prs.c
> index ed8be396428b..9af22f497a40 100644
> --- a/drivers/net/ethernet/marvell/mvpp2/mvpp2_prs.c
> +++ b/drivers/net/ethernet/marvell/mvpp2/mvpp2_prs.c
> @@ -1607,59 +1607,45 @@ static int mvpp2_prs_vlan_init(struct platform_device *pdev, struct mvpp2 *priv)
>  static int mvpp2_prs_pppoe_init(struct mvpp2 *priv)
>  {
>  	struct mvpp2_prs_entry pe;
> -	int tid;
> -
> -	/* IPv4 over PPPoE with options */
> -	tid = mvpp2_prs_tcam_first_free(priv, MVPP2_PE_FIRST_FREE_TID,
> -					MVPP2_PE_LAST_FREE_TID);
> -	if (tid < 0)
> -		return tid;
> -
> -	memset(&pe, 0, sizeof(pe));
> -	mvpp2_prs_tcam_lu_set(&pe, MVPP2_PRS_LU_PPPOE);
> -	pe.index = tid;
> -
> -	mvpp2_prs_match_etype(&pe, 0, PPP_IP);
> -
> -	mvpp2_prs_sram_next_lu_set(&pe, MVPP2_PRS_LU_IP4);
> -	mvpp2_prs_sram_ri_update(&pe, MVPP2_PRS_RI_L3_IP4_OPT,
> -				 MVPP2_PRS_RI_L3_PROTO_MASK);
> -	/* goto ipv4 dest-address (skip eth_type + IP-header-size - 4) */
> -	mvpp2_prs_sram_shift_set(&pe, MVPP2_ETH_TYPE_LEN +
> -				 sizeof(struct iphdr) - 4,
> -				 MVPP2_PRS_SRAM_OP_SEL_SHIFT_ADD);
> -	/* Set L3 offset */
> -	mvpp2_prs_sram_offset_set(&pe, MVPP2_PRS_SRAM_UDF_TYPE_L3,
> -				  MVPP2_ETH_TYPE_LEN,
> -				  MVPP2_PRS_SRAM_OP_SEL_UDF_ADD);
> -
> -	/* Update shadow table and hw entry */
> -	mvpp2_prs_shadow_set(priv, pe.index, MVPP2_PRS_LU_PPPOE);
> -	mvpp2_prs_hw_write(priv, &pe);
> +	int tid, ihl;
>  
> -	/* IPv4 over PPPoE without options */
> -	tid = mvpp2_prs_tcam_first_free(priv, MVPP2_PE_FIRST_FREE_TID,
> -					MVPP2_PE_LAST_FREE_TID);
> -	if (tid < 0)
> -		return tid;
> +	/* IPv4 over PPPoE with header length >= 5 */
> +	for (ihl = MVPP2_PRS_IPV4_IHL_MIN; ihl <= MVPP2_PRS_IPV4_IHL_MAX; ihl++) {
> +		tid = mvpp2_prs_tcam_first_free(priv, MVPP2_PE_FIRST_FREE_TID,
> +						MVPP2_PE_LAST_FREE_TID);
pe can be defined here:
struct mvpp2_prs_entry pe = {};

and now memset can be ommited.

> +		if (tid < 0)
> +			return tid;
>  
> -	pe.index = tid;
> +		memset(&pe, 0, sizeof(pe));
> +		mvpp2_prs_tcam_lu_set(&pe, MVPP2_PRS_LU_PPPOE);
> +		pe.index = tid;
[...]
>  
> -- 
> 2.33.1
>