Re: [Intel-wired-lan] [PATCH net-next v4] ethtool: ice: Support for RSS settings to GTP

From: Marcin Szycik
Date: Tue Jan 30 2024 - 09:41:41 EST

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In reply to: Takeru Hayasaka: "[PATCH net-next v4] ethtool: ice: Support for RSS settings to GTP"
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On 30.01.2024 10:53, Takeru Hayasaka wrote:
> This is a patch that enables RSS functionality for GTP packets using ethtool.
>
> A user can include her TEID and make RSS work for GTP-U over IPv4 by doing the

Remove "her" (sorry for missing it last time).

> following:`ethtool -N ens3 rx-flow-hash gtpu4 sde`
>
> In addition to gtpu(4|6), we now support gtpc(4|6),gtpc(4|6)t,gtpu(4|6)e,
> gtpu(4|6)u, and gtpu(4|6)d.
>
> gtpc(4|6): Used for GTP-C in IPv4 and IPv6, where the GTP header format does
> not include a TEID.
> gtpc(4|6)t: Used for GTP-C in IPv4 and IPv6, with a GTP header format that
> includes a TEID.
> gtpu(4|6): Used for GTP-U in both IPv4 and IPv6 scenarios.
> gtpu(4|6)e: Used for GTP-U with extended headers in both IPv4 and IPv6.
> gtpu(4|6)u: Used when the PSC (PDU session container) in the GTP-U extended
> header includes Uplink, applicable to both IPv4 and IPv6.
> gtpu(4|6)d: Used when the PSC in the GTP-U extended header includes Downlink,
> for both IPv4 and IPv6.

I'd still add a short note here that all gtpu have TEID.

> GTP generates a flow that includes an ID called TEID to identify the tunnel.
> This tunnel is created for each UE (User Equipment).By performing RSS based on
> this flow, it is possible to apply RSS for each communication unit from the UE.
> Without this, RSS would only be effective within the range of IP addresses. For
> instance, the PGW can only perform RSS within the IP range of the SGW.
> Problematic from a load distribution perspective, especially if there's a bias
> in the terminals connected to a particular base station.This case can be
> solved by using this patch.
>
> Signed-off-by: Takeru Hayasaka <hayatake396@xxxxxxxxx>
> ---
>
> v2->v3: Based on Harald-san's review, I added documentation and comments to
> ethtool.h and ice.rst.
> v3->v4: Based on Marcin-san's review, I added the missing code for GTPC and
> GTPC_TEID, and revised the documentation and comments.
>
>
> .../device_drivers/ethernet/intel/ice.rst | 23 ++++--
> drivers/net/ethernet/intel/ice/ice_ethtool.c | 82 +++++++++++++++++++
> drivers/net/ethernet/intel/ice/ice_flow.h | 22 +++++
> drivers/net/ethernet/intel/ice/ice_lib.c | 37 +++++++++
> include/uapi/linux/ethtool.h | 48 +++++++++++
> 5 files changed, 207 insertions(+), 5 deletions(-)
>
> diff --git a/Documentation/networking/device_drivers/ethernet/intel/ice.rst b/Documentation/networking/device_drivers/ethernet/intel/ice.rst
> index 5038e54586af..6f48688940c4 100644
> --- a/Documentation/networking/device_drivers/ethernet/intel/ice.rst
> +++ b/Documentation/networking/device_drivers/ethernet/intel/ice.rst
> @@ -368,16 +368,29 @@ more options for Receive Side Scaling (RSS) hash byte configuration.
> # ethtool -N <ethX> rx-flow-hash <type> <option>
>
> Where <type> is:
> - tcp4 signifying TCP over IPv4
> - udp4 signifying UDP over IPv4
> - tcp6 signifying TCP over IPv6
> - udp6 signifying UDP over IPv6
> + tcp4 signifying TCP over IPv4
> + udp4 signifying UDP over IPv4
> + gtpc4 signifying GTP-C over IPv4
> + gtpc4t signifying GTP-C (include TEID) over IPv4
> + gtpu4 signifying GTP-U over IPV4
> + gtpu4e signifying GTP-U and Extension Header over IPV4
> + gtpu4u signifying GTP-U PSC Uplink over IPV4
> + gtpu4d signifying GTP-U PSC Downlink over IPV4
> + tcp6 signifying TCP over IPv6
> + udp6 signifying UDP over IPv6
> + gtpc6 signifying GTP-C over IPv6
> + gtpc6t signifying GTP-C (include TEID) over IPv6
> + gtpu6 signifying GTP-U over IPV6
> + gtpu6e signifying GTP-U and Extension Header over IPV6
> + gtpu6u signifying GTP-U PSC Uplink over IPV6
> + gtpu6d signifying GTP-U PSC Downlink over IPV6
> +
> And <option> is one or more of:
> s Hash on the IP source address of the Rx packet.
> d Hash on the IP destination address of the Rx packet.
> f Hash on bytes 0 and 1 of the Layer 4 header of the Rx packet.
> n Hash on bytes 2 and 3 of the Layer 4 header of the Rx packet.
> -

All headers have two blank lines before them, so don't remove this newline.

> + e Hash on GTP Packet on TEID (4bytes) of the Rx packet.
>
> Accelerated Receive Flow Steering (aRFS)
> ----------------------------------------
> diff --git a/drivers/net/ethernet/intel/ice/ice_ethtool.c b/drivers/net/ethernet/intel/ice/ice_ethtool.c
> index a19b06f18e40..d0e05032f464 100644
> --- a/drivers/net/ethernet/intel/ice/ice_ethtool.c
> +++ b/drivers/net/ethernet/intel/ice/ice_ethtool.c
> @@ -2486,6 +2486,24 @@ static u32 ice_parse_hdrs(struct ethtool_rxnfc *nfc)
> case SCTP_V4_FLOW:
> hdrs |= ICE_FLOW_SEG_HDR_SCTP | ICE_FLOW_SEG_HDR_IPV4;
> break;
> + case GTPU_V4_FLOW:
> + hdrs |= ICE_FLOW_SEG_HDR_GTPU_IP | ICE_FLOW_SEG_HDR_IPV4;
> + break;
> + case GTPC_V4_FLOW:
> + hdrs |= ICE_FLOW_SEG_HDR_GTPC | ICE_FLOW_SEG_HDR_IPV4;
> + break;
> + case GTPC_TEID_V4_FLOW:
> + hdrs |= ICE_FLOW_SEG_HDR_GTPC_TEID | ICE_FLOW_SEG_HDR_IPV4;
> + break;
> + case GTPU_EH_V4_FLOW:
> + hdrs |= ICE_FLOW_SEG_HDR_GTPU_EH | ICE_FLOW_SEG_HDR_IPV4;
> + break;
> + case GTPU_UL_V4_FLOW:
> + hdrs |= ICE_FLOW_SEG_HDR_GTPU_UP | ICE_FLOW_SEG_HDR_IPV4;
> + break;
> + case GTPU_DL_V4_FLOW:
> + hdrs |= ICE_FLOW_SEG_HDR_GTPU_DWN | ICE_FLOW_SEG_HDR_IPV4;
> + break;
> case TCP_V6_FLOW:
> hdrs |= ICE_FLOW_SEG_HDR_TCP | ICE_FLOW_SEG_HDR_IPV6;
> break;
> @@ -2495,6 +2513,24 @@ static u32 ice_parse_hdrs(struct ethtool_rxnfc *nfc)
> case SCTP_V6_FLOW:
> hdrs |= ICE_FLOW_SEG_HDR_SCTP | ICE_FLOW_SEG_HDR_IPV6;
> break;
> + case GTPU_V6_FLOW:
> + hdrs |= ICE_FLOW_SEG_HDR_GTPU_IP | ICE_FLOW_SEG_HDR_IPV6;
> + break;
> + case GTPC_V6_FLOW:
> + hdrs |= ICE_FLOW_SEG_HDR_GTPC | ICE_FLOW_SEG_HDR_IPV6;
> + break;
> + case GTPC_TEID_V6_FLOW:
> + hdrs |= ICE_FLOW_SEG_HDR_GTPC_TEID | ICE_FLOW_SEG_HDR_IPV6;
> + break;
> + case GTPU_EH_V6_FLOW:
> + hdrs |= ICE_FLOW_SEG_HDR_GTPU_EH | ICE_FLOW_SEG_HDR_IPV6;
> + break;
> + case GTPU_UL_V6_FLOW:
> + hdrs |= ICE_FLOW_SEG_HDR_GTPU_UP | ICE_FLOW_SEG_HDR_IPV6;
> + break;
> + case GTPU_DL_V6_FLOW:
> + hdrs |= ICE_FLOW_SEG_HDR_GTPU_DWN | ICE_FLOW_SEG_HDR_IPV6;
> + break;
> default:
> break;
> }
> @@ -2518,6 +2554,12 @@ static u64 ice_parse_hash_flds(struct ethtool_rxnfc *nfc, bool symm)
> case TCP_V4_FLOW:
> case UDP_V4_FLOW:
> case SCTP_V4_FLOW:
> + case GTPU_V4_FLOW:
> + case GTPC_V4_FLOW:
> + case GTPC_TEID_V4_FLOW:
> + case GTPU_EH_V4_FLOW:
> + case GTPU_UL_V4_FLOW:
> + case GTPU_DL_V4_FLOW:
> if (nfc->data & RXH_IP_SRC)
> hfld |= ICE_FLOW_HASH_FLD_IPV4_SA;
> if (nfc->data & RXH_IP_DST)
> @@ -2526,6 +2568,12 @@ static u64 ice_parse_hash_flds(struct ethtool_rxnfc *nfc, bool symm)
> case TCP_V6_FLOW:
> case UDP_V6_FLOW:
> case SCTP_V6_FLOW:
> + case GTPU_V6_FLOW:
> + case GTPC_V6_FLOW:
> + case GTPC_TEID_V6_FLOW:
> + case GTPU_EH_V6_FLOW:
> + case GTPU_UL_V6_FLOW:
> + case GTPU_DL_V6_FLOW:
> if (nfc->data & RXH_IP_SRC)
> hfld |= ICE_FLOW_HASH_FLD_IPV6_SA;
> if (nfc->data & RXH_IP_DST)
> @@ -2564,6 +2612,33 @@ static u64 ice_parse_hash_flds(struct ethtool_rxnfc *nfc, bool symm)
> }
> }
>
> + if (nfc->data & RXH_GTP_TEID) {
> + switch (nfc->flow_type) {
> + case GTPC_TEID_V4_FLOW:
> + case GTPC_TEID_V6_FLOW:
> + hfld |= ICE_FLOW_HASH_FLD_GTPC_TEID;
> + break;
> + case GTPU_V4_FLOW:
> + case GTPU_V6_FLOW:
> + hfld |= ICE_FLOW_HASH_FLD_GTPU_IP_TEID;
> + break;
> + case GTPU_EH_V4_FLOW:
> + case GTPU_EH_V6_FLOW:
> + hfld |= ICE_FLOW_HASH_FLD_GTPU_EH_TEID;
> + break;
> + case GTPU_UL_V4_FLOW:
> + case GTPU_UL_V6_FLOW:
> + hfld |= ICE_FLOW_HASH_FLD_GTPU_UP_TEID;
> + break;
> + case GTPU_DL_V4_FLOW:
> + case GTPU_DL_V6_FLOW:
> + hfld |= ICE_FLOW_HASH_FLD_GTPU_DWN_TEID;
> + break;
> + default:
> + break;
> + }
> + }
> +
> return hfld;
> }
>
> @@ -2676,6 +2751,13 @@ ice_get_rss_hash_opt(struct ice_vsi *vsi, struct ethtool_rxnfc *nfc)
> hash_flds & ICE_FLOW_HASH_FLD_UDP_DST_PORT ||
> hash_flds & ICE_FLOW_HASH_FLD_SCTP_DST_PORT)
> nfc->data |= (u64)RXH_L4_B_2_3;
> +
> + if (hash_flds & ICE_FLOW_HASH_FLD_GTPC_TEID ||
> + hash_flds & ICE_FLOW_HASH_FLD_GTPU_IP_TEID ||
> + hash_flds & ICE_FLOW_HASH_FLD_GTPU_EH_TEID ||
> + hash_flds & ICE_FLOW_HASH_FLD_GTPU_UP_TEID ||
> + hash_flds & ICE_FLOW_HASH_FLD_GTPU_DWN_TEID)
> + nfc->data |= (u64)RXH_GTP_TEID;
> }
>
> /**
> diff --git a/drivers/net/ethernet/intel/ice/ice_flow.h b/drivers/net/ethernet/intel/ice/ice_flow.h
> index ff82915ab497..9d6803d68a45 100644
> --- a/drivers/net/ethernet/intel/ice/ice_flow.h
> +++ b/drivers/net/ethernet/intel/ice/ice_flow.h
> @@ -66,6 +66,20 @@
> (ICE_FLOW_HASH_IPV6 | ICE_FLOW_HASH_GTP_U_EH_TEID | \
> ICE_FLOW_HASH_GTP_U_EH_QFI)
>
> +#define ICE_FLOW_HASH_GTP_U_UP \
> + (BIT_ULL(ICE_FLOW_FIELD_IDX_GTPU_UP_TEID))
> +#define ICE_FLOW_HASH_GTP_U_DWN \
> + (BIT_ULL(ICE_FLOW_FIELD_IDX_GTPU_DWN_TEID))
> +
> +#define ICE_FLOW_HASH_GTP_U_IPV4_UP \
> + (ICE_FLOW_HASH_IPV4 | ICE_FLOW_HASH_GTP_U_UP)
> +#define ICE_FLOW_HASH_GTP_U_IPV6_UP \
> + (ICE_FLOW_HASH_IPV6 | ICE_FLOW_HASH_GTP_U_UP)
> +#define ICE_FLOW_HASH_GTP_U_IPV4_DWN \
> + (ICE_FLOW_HASH_IPV4 | ICE_FLOW_HASH_GTP_U_DWN)
> +#define ICE_FLOW_HASH_GTP_U_IPV6_DWN \
> + (ICE_FLOW_HASH_IPV6 | ICE_FLOW_HASH_GTP_U_DWN)
> +
> #define ICE_FLOW_HASH_PPPOE_SESS_ID \
> (BIT_ULL(ICE_FLOW_FIELD_IDX_PPPOE_SESS_ID))
>
> @@ -242,6 +256,14 @@ enum ice_flow_field {
> #define ICE_FLOW_HASH_FLD_SCTP_DST_PORT \
> BIT_ULL(ICE_FLOW_FIELD_IDX_SCTP_DST_PORT)
>
> +#define ICE_FLOW_HASH_FLD_GTPC_TEID BIT_ULL(ICE_FLOW_FIELD_IDX_GTPC_TEID)
> +#define ICE_FLOW_HASH_FLD_GTPU_IP_TEID BIT_ULL(ICE_FLOW_FIELD_IDX_GTPU_IP_TEID)
> +#define ICE_FLOW_HASH_FLD_GTPU_EH_TEID BIT_ULL(ICE_FLOW_FIELD_IDX_GTPU_EH_TEID)
> +#define ICE_FLOW_HASH_FLD_GTPU_EH_QFI BIT_ULL(ICE_FLOW_FIELD_IDX_GTPU_EH_QFI)

This doesn't seem to be used anywhere.

> +#define ICE_FLOW_HASH_FLD_GTPU_UP_TEID BIT_ULL(ICE_FLOW_FIELD_IDX_GTPU_UP_TEID)
> +#define ICE_FLOW_HASH_FLD_GTPU_DWN_TEID \
> + BIT_ULL(ICE_FLOW_FIELD_IDX_GTPU_DWN_TEID)
> +
> /* Flow headers and fields for AVF support */
> enum ice_flow_avf_hdr_field {
> /* Values 0 - 28 are reserved for future use */
> diff --git a/drivers/net/ethernet/intel/ice/ice_lib.c b/drivers/net/ethernet/intel/ice/ice_lib.c
> index 9be724291ef8..72f737c6c9ba 100644
> --- a/drivers/net/ethernet/intel/ice/ice_lib.c
> +++ b/drivers/net/ethernet/intel/ice/ice_lib.c
> @@ -1618,6 +1618,25 @@ static const struct ice_rss_hash_cfg default_rss_cfgs[] = {
> */
> {ICE_FLOW_SEG_HDR_SCTP | ICE_FLOW_SEG_HDR_IPV4,
> ICE_HASH_SCTP_IPV4, ICE_RSS_OUTER_HEADERS, false},
> + /* configure RSS for gtpc4 with input set IPv4 src/dst */
> + {ICE_FLOW_SEG_HDR_GTPC | ICE_FLOW_SEG_HDR_IPV4,
> + ICE_FLOW_HASH_IPV4, ICE_RSS_OUTER_HEADERS, false},
> + /* configure RSS for gtpc4t with input set IPv4 src/dst */
> + {ICE_FLOW_SEG_HDR_GTPC_TEID | ICE_FLOW_SEG_HDR_IPV4,
> + ICE_FLOW_HASH_GTP_U_IPV4_TEID, ICE_RSS_OUTER_HEADERS, false},
> + /* configure RSS for gtpu4 with input set IPv4 src/dst */
> + {ICE_FLOW_SEG_HDR_GTPU_IP | ICE_FLOW_SEG_HDR_IPV4,
> + ICE_FLOW_HASH_GTP_IPV4_TEID, ICE_RSS_OUTER_HEADERS, false},

Two braces above: looks like ICE_FLOW_HASH_GTP_U_IPV4_TEID and
ICE_FLOW_HASH_GTP_IPV4_TEID should be swapped?

> + /* configure RSS for gtpu4e with input set IPv4 src/dst */
> + {ICE_FLOW_SEG_HDR_GTPU_EH | ICE_FLOW_SEG_HDR_IPV4,
> + ICE_FLOW_HASH_GTP_U_IPV4_EH, ICE_RSS_OUTER_HEADERS, false},
> + /* configure RSS for gtpu4u with input set IPv4 src/dst */
> + { ICE_FLOW_SEG_HDR_GTPU_UP | ICE_FLOW_SEG_HDR_IPV4,
> + ICE_FLOW_HASH_GTP_U_IPV4_UP, ICE_RSS_OUTER_HEADERS, false},
> + /* configure RSS for gtpu4d with input set IPv4 src/dst */
> + {ICE_FLOW_SEG_HDR_GTPU_DWN | ICE_FLOW_SEG_HDR_IPV4,
> + ICE_FLOW_HASH_GTP_U_IPV4_DWN, ICE_RSS_OUTER_HEADERS, false},
> +
> /* configure RSS for tcp6 with input set IPv6 src/dst, TCP src/dst */
> {ICE_FLOW_SEG_HDR_TCP | ICE_FLOW_SEG_HDR_IPV6,
> ICE_HASH_TCP_IPV6, ICE_RSS_ANY_HEADERS, false},
> @@ -1632,6 +1651,24 @@ static const struct ice_rss_hash_cfg default_rss_cfgs[] = {
> /* configure RSS for IPSEC ESP SPI with input set MAC_IPV4_SPI */
> {ICE_FLOW_SEG_HDR_ESP,
> ICE_FLOW_HASH_ESP_SPI, ICE_RSS_OUTER_HEADERS, false},
> + /* configure RSS for gtpc6 with input set IPv6 src/dst */
> + {ICE_FLOW_SEG_HDR_GTPC | ICE_FLOW_SEG_HDR_IPV6,
> + ICE_FLOW_HASH_IPV6, ICE_RSS_OUTER_HEADERS, false},
> + /* configure RSS for gtpc6t with input set IPv6 src/dst */
> + {ICE_FLOW_SEG_HDR_GTPC_TEID | ICE_FLOW_SEG_HDR_IPV6,
> + ICE_FLOW_HASH_GTP_U_IPV6_TEID, ICE_RSS_OUTER_HEADERS, false},
> + /* configure RSS for gtpu6 with input set IPv6 src/dst */
> + {ICE_FLOW_SEG_HDR_GTPU_IP | ICE_FLOW_SEG_HDR_IPV6,
> + ICE_FLOW_HASH_GTP_IPV6_TEID, ICE_RSS_OUTER_HEADERS, false},

Ditto, ICE_FLOW_HASH_GTP_U_IPV6_TEID and ICE_FLOW_HASH_GTP_IPV6_TEID seem
to be incorrectly placed.

> + /* configure RSS for gtpu6e with input set IPv6 src/dst */
> + {ICE_FLOW_SEG_HDR_GTPU_EH | ICE_FLOW_SEG_HDR_IPV6,
> + ICE_FLOW_HASH_GTP_U_IPV6_EH, ICE_RSS_OUTER_HEADERS, false},
> + /* configure RSS for gtpu6u with input set IPv6 src/dst */
> + { ICE_FLOW_SEG_HDR_GTPU_UP | ICE_FLOW_SEG_HDR_IPV6,
> + ICE_FLOW_HASH_GTP_U_IPV6_UP, ICE_RSS_OUTER_HEADERS, false},
> + /* configure RSS for gtpu6d with input set IPv6 src/dst */
> + {ICE_FLOW_SEG_HDR_GTPU_DWN | ICE_FLOW_SEG_HDR_IPV6,
> + ICE_FLOW_HASH_GTP_U_IPV6_DWN, ICE_RSS_OUTER_HEADERS, false},
> };
>
> /**
> diff --git a/include/uapi/linux/ethtool.h b/include/uapi/linux/ethtool.h
> index 06ef6b78b7de..cdc3fa7fc944 100644
> --- a/include/uapi/linux/ethtool.h
> +++ b/include/uapi/linux/ethtool.h
> @@ -2023,6 +2023,53 @@ static inline int ethtool_validate_duplex(__u8 duplex)
> #define IPV4_FLOW 0x10 /* hash only */
> #define IPV6_FLOW 0x11 /* hash only */
> #define ETHER_FLOW 0x12 /* spec only (ether_spec) */
> +
> +/* Used for GTP-U IPv4 and IPv6.
> + * The format of GTP packets only includes
> + * elements such as TEID and GTP version.
> + * It is primarily intended for data communication of the UE.
> + */
> +#define GTPU_V4_FLOW 0x13 /* hash only */
> +#define GTPU_V6_FLOW 0x14 /* hash only */
> +
> +/* Use for GTP-C IPv4 and v6.
> + * The format of these GTP packets does not include TEID.
> + * Primarily expected to be used for communication
> + * to create sessions for UE data communication,
> + * commonly referred to as CSR (Create Session Request).
> + */
> +#define GTPC_V4_FLOW 0x15 /* hash only */
> +#define GTPC_V6_FLOW 0x16 /* hash only */
> +
> +/* Use for GTP-C IPv4 and v6.
> + * Unlike GTPC_V4_FLOW, the format of these GTP packets includes TEID.
> + * After session creation, it becomes this packet.
> + * This is mainly used for requests to realize UE handover.
> + */
> +#define GTPC_TEID_V4_FLOW 0x17 /* hash only */
> +#define GTPC_TEID_V6_FLOW 0x18 /* hash only */
> +
> +/* Use for GTP-U and extended headers for the PDU session container(PSC).

Again, missing space before (

> + * The format of these GTP packets includes TEID and QFI.
> + * In 5G communication using UPF (User Plane Function),
> + * data communication with this extended header is performed.
> + */
> +#define GTPU_EH_V4_FLOW 0x19 /* hash only */
> +#define GTPU_EH_V6_FLOW 0x1a /* hash only */
> +
> +/* Use for GTP-U IPv4 and v6 PDU session container(PSC) extended headers.

Again, missing space before (

> + * This differs from GTPU_EH_V(4|6)_FLOW in that it is distinguished by
> + * UL/DL included in the PSC.
> + * There are differences in the data included based on Downlink/Uplink,
> + * and can be used to distinguish packets.
> + * The functions described so far are useful when you want to
> + * handle communication from the mobile network in UPF, PGW, etc.
> + */
> +#define GTPU_UL_V4_FLOW 0x1b /* hash only */
> +#define GTPU_UL_V6_FLOW 0x1c /* hash only */
> +#define GTPU_DL_V4_FLOW 0x1d /* hash only */
> +#define GTPU_DL_V6_FLOW 0x1e /* hash only */
> +
> /* Flag to enable additional fields in struct ethtool_rx_flow_spec */
> #define FLOW_EXT 0x80000000
> #define FLOW_MAC_EXT 0x40000000
> @@ -2037,6 +2084,7 @@ static inline int ethtool_validate_duplex(__u8 duplex)
> #define RXH_IP_DST (1 << 5)
> #define RXH_L4_B_0_1 (1 << 6) /* src port in case of TCP/UDP/SCTP */
> #define RXH_L4_B_2_3 (1 << 7) /* dst port in case of TCP/UDP/SCTP */
> +#define RXH_GTP_TEID (1 << 8) /* teid in case of GTP */
> #define RXH_DISCARD (1 << 31)
>
> #define RX_CLS_FLOW_DISC 0xffffffffffffffffULL

Thanks,
Marcin

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