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Message-ID: <47c4c421-c9fe-4f93-bcf9-f32c55be5e7d@intel.com>
Date: Thu, 29 Feb 2024 12:59:02 +0100
From: "Plachno, Lukasz" <lukasz.plachno@...el.com>
To: <intel-wired-lan@...ts.osuosl.org>
CC: <netdev@...r.kernel.org>, <brett.creeley@....com>, <horms@...nel.org>,
	<pmenzel@...gen.mpg.de>, <aleksander.lobakin@...el.com>, Jakub Buchocki
	<jakubx.buchocki@...el.com>, Mateusz Pacuszka <mateuszx.pacuszka@...el.com>
Subject: Re: [PATCH iwl-next v7 2/2] ice: Implement 'flow-type ether' rules

On 2/12/2024 12:03 PM, Lukasz Plachno wrote:
> From: Jakub Buchocki <jakubx.buchocki@...el.com>
> 
> Add support for 'flow-type ether' Flow Director rules via ethtool.
> 
> Create packet segment info for filter configuration based on ethtool
> command parameters. Reuse infrastructure already created for
> ipv4 and ipv6 flows to convert packet segment into
> extraction sequence, which is later used to program the filter
> inside Flow Director block of the Rx pipeline.
> 
> Rules not containing masks are processed by the Flow Director,
> and support the following set of input parameters in all combinations:
> src, dst, proto, vlan-etype, vlan, action.
> 
> It is possible to specify address mask in ethtool parameters but only
> 00:00:00:00:00 and FF:FF:FF:FF:FF are valid.
> The same applies to proto, vlan-etype and vlan masks:
> only 0x0000 and 0xffff masks are valid.
> 
> Testing:
>    (DUT) iperf3 -s
>    (DUT) ethtool -U ens785f0np0 flow-type ether dst <ens785f0np0 mac> \
>          action 10
>    (DUT) watch 'ethtool -S ens785f0np0 | grep rx_queue'
>    (LP)  iperf3 -c ${DUT_IP}
> 
>    Counters increase only for:
>      'rx_queue_10_packets'
>      'rx_queue_10_bytes'
> 
> Signed-off-by: Jakub Buchocki <jakubx.buchocki@...el.com>
> Co-developed-by: Mateusz Pacuszka <mateuszx.pacuszka@...el.com>
> Signed-off-by: Mateusz Pacuszka <mateuszx.pacuszka@...el.com>
> Signed-off-by: Lukasz Plachno <lukasz.plachno@...el.com>
> ---
>   .../net/ethernet/intel/ice/ice_ethtool_fdir.c | 130 +++++++++++++++++-
>   drivers/net/ethernet/intel/ice/ice_fdir.c     |  27 ++++
>   drivers/net/ethernet/intel/ice/ice_fdir.h     |   5 +
>   drivers/net/ethernet/intel/ice/ice_type.h     |   1 +
>   4 files changed, 162 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/net/ethernet/intel/ice/ice_ethtool_fdir.c b/drivers/net/ethernet/intel/ice/ice_ethtool_fdir.c
> index 9a1a04f5f146..6963e0da6518 100644
> --- a/drivers/net/ethernet/intel/ice/ice_ethtool_fdir.c
> +++ b/drivers/net/ethernet/intel/ice/ice_ethtool_fdir.c
> @@ -41,6 +41,8 @@ static struct in6_addr zero_ipv6_addr_mask = {
>   static int ice_fltr_to_ethtool_flow(enum ice_fltr_ptype flow)
>   {
>   	switch (flow) {
> +	case ICE_FLTR_PTYPE_NONF_ETH:
> +		return ETHER_FLOW;
>   	case ICE_FLTR_PTYPE_NONF_IPV4_TCP:
>   		return TCP_V4_FLOW;
>   	case ICE_FLTR_PTYPE_NONF_IPV4_UDP:
> @@ -72,6 +74,8 @@ static int ice_fltr_to_ethtool_flow(enum ice_fltr_ptype flow)
>   static enum ice_fltr_ptype ice_ethtool_flow_to_fltr(int eth)
>   {
>   	switch (eth) {
> +	case ETHER_FLOW:
> +		return ICE_FLTR_PTYPE_NONF_ETH;
>   	case TCP_V4_FLOW:
>   		return ICE_FLTR_PTYPE_NONF_IPV4_TCP;
>   	case UDP_V4_FLOW:
> @@ -137,6 +141,10 @@ int ice_get_ethtool_fdir_entry(struct ice_hw *hw, struct ethtool_rxnfc *cmd)
>   	memset(&fsp->m_ext, 0, sizeof(fsp->m_ext));
>   
>   	switch (fsp->flow_type) {
> +	case ETHER_FLOW:
> +		fsp->h_u.ether_spec = rule->eth;
> +		fsp->m_u.ether_spec = rule->eth_mask;
> +		break;
>   	case IPV4_USER_FLOW:
>   		fsp->h_u.usr_ip4_spec.ip_ver = ETH_RX_NFC_IP4;
>   		fsp->h_u.usr_ip4_spec.proto = 0;
> @@ -1193,6 +1201,112 @@ ice_set_fdir_ip6_usr_seg(struct ice_flow_seg_info *seg,
>   	return 0;
>   }
>   
> +/**
> + * ice_fdir_vlan_valid - validate VLAN data for Flow Director rule
> + * @fsp: pointer to ethtool Rx flow specification
> + *
> + * Return: true if vlan data is valid, false otherwise
> + */
> +static bool ice_fdir_vlan_valid(struct ethtool_rx_flow_spec *fsp)
> +{
> +	if (fsp->m_ext.vlan_etype && !eth_type_vlan(fsp->h_ext.vlan_etype))
> +		return false;
> +
> +	if (fsp->m_ext.vlan_tci &&
> +	    ntohs(fsp->h_ext.vlan_tci) >= VLAN_N_VID)
> +		return false;
> +
> +	return true;
> +}
> +
> +/**
> + * ice_set_ether_flow_seg
> + * @dev: network interface device structure
> + * @seg: flow segment for programming
> + * @eth_spec: mask data from ethtool
> + *
> + * Return: 0 on success and errno in case of error.
> + */
> +static int ice_set_ether_flow_seg(struct device *dev,
> +				  struct ice_flow_seg_info *seg,
> +				  struct ethhdr *eth_spec)
> +{
> +	ICE_FLOW_SET_HDRS(seg, ICE_FLOW_SEG_HDR_ETH);
> +
> +	/* empty rules are not valid */
> +	if (is_zero_ether_addr(eth_spec->h_source) &&
> +	    is_zero_ether_addr(eth_spec->h_dest) &&
> +	    !eth_spec->h_proto)
> +		return -EINVAL;
> +
> +	/* Ethertype */
> +	if (eth_spec->h_proto == htons(0xFFFF)) {
> +		ice_flow_set_fld(seg, ICE_FLOW_FIELD_IDX_ETH_TYPE,
> +				 ICE_FLOW_FLD_OFF_INVAL,
> +				 ICE_FLOW_FLD_OFF_INVAL,
> +				 ICE_FLOW_FLD_OFF_INVAL, false);
> +	} else if (eth_spec->h_proto) {
> +		dev_warn(dev, "Only 0x0000 or 0xffff proto mask is allowed for flow-type ether");
> +		return -EOPNOTSUPP;
> +	}
> +
> +	/* Source MAC address */
> +	if (is_broadcast_ether_addr(eth_spec->h_source))
> +		ice_flow_set_fld(seg, ICE_FLOW_FIELD_IDX_ETH_SA,
> +				 ICE_FLOW_FLD_OFF_INVAL, ICE_FLOW_FLD_OFF_INVAL,
> +				 ICE_FLOW_FLD_OFF_INVAL, false);
> +	else if (!is_zero_ether_addr(eth_spec->h_source))
> +		goto err_mask;
> +
> +	/* Destination MAC address */
> +	if (is_broadcast_ether_addr(eth_spec->h_dest))
> +		ice_flow_set_fld(seg, ICE_FLOW_FIELD_IDX_ETH_DA,
> +				 ICE_FLOW_FLD_OFF_INVAL, ICE_FLOW_FLD_OFF_INVAL,
> +				 ICE_FLOW_FLD_OFF_INVAL, false);
> +	else if (!is_zero_ether_addr(eth_spec->h_dest))
> +		goto err_mask;
> +
> +	return 0;
> +
> +err_mask:
> +	dev_warn(dev, "Only 00:00:00:00:00:00 or ff:ff:ff:ff:ff:ff MAC address mask is allowed for flow-type ether");
> +	return -EOPNOTSUPP;
> +}
> +
> +/**
> + * ice_set_fdir_vlan_seg
> + * @seg: flow segment for programming
> + * @ext_masks: masks for additional RX flow fields
> + */
> +static int
> +ice_set_fdir_vlan_seg(struct ice_flow_seg_info *seg,
> +		      struct ethtool_flow_ext *ext_masks)
> +{
> +	ICE_FLOW_SET_HDRS(seg, ICE_FLOW_SEG_HDR_VLAN);
> +
> +	if (ext_masks->vlan_etype) {
> +		if (ext_masks->vlan_etype != htons(0xFFFF))
> +			return -EOPNOTSUPP;
> +
> +		ice_flow_set_fld(seg, ICE_FLOW_FIELD_IDX_S_VLAN,
> +				 ICE_FLOW_FLD_OFF_INVAL,
> +				 ICE_FLOW_FLD_OFF_INVAL,
> +				 ICE_FLOW_FLD_OFF_INVAL, false);
> +	}
> +
> +	if (ext_masks->vlan_tci) {
> +		if (ext_masks->vlan_tci != htons(0xFFFF))
> +			return -EOPNOTSUPP;
> +
> +		ice_flow_set_fld(seg, ICE_FLOW_FIELD_IDX_C_VLAN,
> +				 ICE_FLOW_FLD_OFF_INVAL,
> +				 ICE_FLOW_FLD_OFF_INVAL,
> +				 ICE_FLOW_FLD_OFF_INVAL, false);
> +	}
> +
> +	return 0;
> +}
> +
>   /**
>    * ice_cfg_fdir_xtrct_seq - Configure extraction sequence for the given filter
>    * @pf: PF structure
> @@ -1209,7 +1323,7 @@ ice_cfg_fdir_xtrct_seq(struct ice_pf *pf, struct ethtool_rx_flow_spec *fsp,
>   	struct device *dev = ice_pf_to_dev(pf);
>   	enum ice_fltr_ptype fltr_idx;
>   	struct ice_hw *hw = &pf->hw;
> -	bool perfect_filter;
> +	bool perfect_filter = false;
>   	int ret;
>   
>   	seg = devm_kzalloc(dev, sizeof(*seg), GFP_KERNEL);
> @@ -1262,6 +1376,16 @@ ice_cfg_fdir_xtrct_seq(struct ice_pf *pf, struct ethtool_rx_flow_spec *fsp,
>   		ret = ice_set_fdir_ip6_usr_seg(seg, &fsp->m_u.usr_ip6_spec,
>   					       &perfect_filter);
>   		break;
> +	case ETHER_FLOW:
> +		ret = ice_set_ether_flow_seg(dev, seg, &fsp->m_u.ether_spec);
> +		if (!ret && (fsp->m_ext.vlan_etype || fsp->m_ext.vlan_tci)) {
> +			if (!ice_fdir_vlan_valid(fsp)) {
> +				ret = -EINVAL;
> +				break;
> +			}
> +			ret = ice_set_fdir_vlan_seg(seg, &fsp->m_ext);
> +		}
> +		break;
>   	default:
>   		ret = -EINVAL;
>   	}
> @@ -1823,6 +1947,10 @@ ice_set_fdir_input_set(struct ice_vsi *vsi, struct ethtool_rx_flow_spec *fsp,
>   		input->mask.v6.tc = fsp->m_u.usr_ip6_spec.tclass;
>   		input->mask.v6.proto = fsp->m_u.usr_ip6_spec.l4_proto;
>   		break;
> +	case ETHER_FLOW:
> +		input->eth = fsp->h_u.ether_spec;
> +		input->eth_mask = fsp->m_u.ether_spec;
> +		break;
>   	default:
>   		/* not doing un-parsed flow types */
>   		return -EINVAL;
> diff --git a/drivers/net/ethernet/intel/ice/ice_fdir.c b/drivers/net/ethernet/intel/ice/ice_fdir.c
> index 1f7b26f38818..b51ca73ca6c4 100644
> --- a/drivers/net/ethernet/intel/ice/ice_fdir.c
> +++ b/drivers/net/ethernet/intel/ice/ice_fdir.c
> @@ -4,6 +4,8 @@
>   #include "ice_common.h"
>   
>   /* These are training packet headers used to program flow director filters. */
> +static const u8 ice_fdir_eth_pkt[22];
> +
>   static const u8 ice_fdir_tcpv4_pkt[] = {
>   	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
>   	0x00, 0x00, 0x00, 0x00, 0x08, 0x00, 0x45, 0x00,
> @@ -416,6 +418,11 @@ static const u8 ice_fdir_ip6_tun_pkt[] = {
>   
>   /* Flow Director no-op training packet table */
>   static const struct ice_fdir_base_pkt ice_fdir_pkt[] = {
> +	{
> +		ICE_FLTR_PTYPE_NONF_ETH,
> +		sizeof(ice_fdir_eth_pkt), ice_fdir_eth_pkt,
> +		sizeof(ice_fdir_eth_pkt), ice_fdir_eth_pkt,
> +	},
>   	{
>   		ICE_FLTR_PTYPE_NONF_IPV4_TCP,
>   		sizeof(ice_fdir_tcpv4_pkt), ice_fdir_tcpv4_pkt,
> @@ -914,6 +921,22 @@ ice_fdir_get_gen_prgm_pkt(struct ice_hw *hw, struct ice_fdir_fltr *input,
>   	 * perspective. The input from user is from Rx filter perspective.
>   	 */
>   	switch (flow) {
> +	case ICE_FLTR_PTYPE_NONF_ETH:
> +		ice_pkt_insert_mac_addr(loc, input->eth.h_dest);
> +		ice_pkt_insert_mac_addr(loc + ETH_ALEN, input->eth.h_source);
> +		if (input->ext_data.vlan_tag ||
> +		    input->ext_data.vlan_type) {
> +			ice_pkt_insert_u16(loc, ICE_ETH_TYPE_F_OFFSET,
> +					   input->ext_data.vlan_type);
> +			ice_pkt_insert_u16(loc, ICE_ETH_VLAN_TCI_OFFSET,
> +					   input->ext_data.vlan_tag);
> +			ice_pkt_insert_u16(loc, ICE_ETH_TYPE_VLAN_OFFSET,
> +					   input->eth.h_proto);
> +		} else {
> +			ice_pkt_insert_u16(loc, ICE_ETH_TYPE_F_OFFSET,
> +					   input->eth.h_proto);
> +		}
> +		break;
>   	case ICE_FLTR_PTYPE_NONF_IPV4_TCP:
>   		ice_pkt_insert_u32(loc, ICE_IPV4_DST_ADDR_OFFSET,
>   				   input->ip.v4.src_ip);
> @@ -1201,6 +1224,10 @@ ice_fdir_comp_rules(struct ice_fdir_fltr *a,  struct ice_fdir_fltr *b)
>   	 * same flow_type.
>   	 */
>   	switch (flow_type) {
> +	case ICE_FLTR_PTYPE_NONF_ETH:
> +		if (!memcmp(&a->eth, &b->eth, sizeof(a->eth)))
> +			return true;
> +		break;
>   	case ICE_FLTR_PTYPE_NONF_IPV4_TCP:
>   	case ICE_FLTR_PTYPE_NONF_IPV4_UDP:
>   	case ICE_FLTR_PTYPE_NONF_IPV4_SCTP:
> diff --git a/drivers/net/ethernet/intel/ice/ice_fdir.h b/drivers/net/ethernet/intel/ice/ice_fdir.h
> index 1b9b84490689..021ecbac7848 100644
> --- a/drivers/net/ethernet/intel/ice/ice_fdir.h
> +++ b/drivers/net/ethernet/intel/ice/ice_fdir.h
> @@ -8,6 +8,9 @@
>   #define ICE_FDIR_MAX_RAW_PKT_SIZE	(512 + ICE_FDIR_TUN_PKT_OFF)
>   
>   /* macros for offsets into packets for flow director programming */
> +#define ICE_ETH_TYPE_F_OFFSET		12
> +#define ICE_ETH_VLAN_TCI_OFFSET		14
> +#define ICE_ETH_TYPE_VLAN_OFFSET	16
>   #define ICE_IPV4_SRC_ADDR_OFFSET	26
>   #define ICE_IPV4_DST_ADDR_OFFSET	30
>   #define ICE_IPV4_TCP_SRC_PORT_OFFSET	34
> @@ -159,6 +162,8 @@ struct ice_fdir_fltr {
>   	struct list_head fltr_node;
>   	enum ice_fltr_ptype flow_type;
>   
> +	struct ethhdr eth, eth_mask;
> +
>   	union {
>   		struct ice_fdir_v4 v4;
>   		struct ice_fdir_v6 v6;
> diff --git a/drivers/net/ethernet/intel/ice/ice_type.h b/drivers/net/ethernet/intel/ice/ice_type.h
> index 6df7c4487ad0..391e48d2bb92 100644
> --- a/drivers/net/ethernet/intel/ice/ice_type.h
> +++ b/drivers/net/ethernet/intel/ice/ice_type.h
> @@ -203,6 +203,7 @@ struct ice_phy_info {
>   enum ice_fltr_ptype {
>   	/* NONE - used for undef/error */
>   	ICE_FLTR_PTYPE_NONF_NONE = 0,
> +	ICE_FLTR_PTYPE_NONF_ETH,
>   	ICE_FLTR_PTYPE_NONF_IPV4_UDP,
>   	ICE_FLTR_PTYPE_NONF_IPV4_TCP,
>   	ICE_FLTR_PTYPE_NONF_IPV4_SCTP,

Internal validation in Intel reported issues with handling of vlan-etype 
parameter, I will send v8 when I am able to fix the issue.

Ɓukasz

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