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Miller" , Jakub Kicinski CC: , Eric Dumazet , Paolo Abeni , Simon Horman , Jonathan Corbet , Tony Nguyen , Przemek Kitszel , Andrew Lunn , "Tariq Toukan" , Edward Cree , Ahmed Zaki , , Gal Pressman , Cosmin Ratiu Subject: [PATCH net-next v5 1/4] ethtool: Symmetric OR-XOR RSS hash Date: Mon, 24 Feb 2025 19:44:13 +0200 Message-ID: <20250224174416.499070-2-gal@nvidia.com> X-Mailer: git-send-email 2.40.1 In-Reply-To: <20250224174416.499070-1-gal@nvidia.com> References: <20250224174416.499070-1-gal@nvidia.com> Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-NV-OnPremToCloud: AnonymousSubmission X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: BN3PEPF0000B370:EE_|PH7PR12MB7940:EE_ X-MS-Office365-Filtering-Correlation-Id: 672d62d0-42af-43a7-3040-08dd54faeb90 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|36860700013|82310400026|7416014|376014|1800799024; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:216.228.117.161;CTRY:US;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:mail.nvidia.com;PTR:dc6edge2.nvidia.com;CAT:NONE;SFS:(13230040)(36860700013)(82310400026)(7416014)(376014)(1800799024);DIR:OUT;SFP:1101; X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 24 Feb 2025 17:44:42.4943 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 672d62d0-42af-43a7-3040-08dd54faeb90 X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a;Ip=[216.228.117.161];Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: BN3PEPF0000B370.namprd21.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: PH7PR12MB7940 X-Patchwork-Delegate: kuba@kernel.org Add an additional type of symmetric RSS hash type: OR-XOR. The "Symmetric-OR-XOR" algorithm transforms the input as follows: (SRC_IP | DST_IP, SRC_IP ^ DST_IP, SRC_PORT | DST_PORT, SRC_PORT ^ DST_PORT) Change 'cap_rss_sym_xor_supported' to 'supported_input_xfrm', a bitmap of supported RXH_XFRM_* types. Reviewed-by: Cosmin Ratiu Reviewed-by: Tariq Toukan Signed-off-by: Gal Pressman Reviewed-by: Edward Cree --- Documentation/networking/ethtool-netlink.rst | 2 +- Documentation/networking/scaling.rst | 15 +++++++++++---- drivers/net/ethernet/intel/iavf/iavf_ethtool.c | 2 +- drivers/net/ethernet/intel/ice/ice_ethtool.c | 2 +- include/linux/ethtool.h | 5 ++--- include/uapi/linux/ethtool.h | 4 ++++ net/ethtool/ioctl.c | 8 ++++---- 7 files changed, 24 insertions(+), 14 deletions(-) diff --git a/Documentation/networking/ethtool-netlink.rst b/Documentation/networking/ethtool-netlink.rst index 3770a2294509..b6e9af4d0f1b 100644 --- a/Documentation/networking/ethtool-netlink.rst +++ b/Documentation/networking/ethtool-netlink.rst @@ -1934,7 +1934,7 @@ ETHTOOL_A_RSS_INDIR attribute returns RSS indirection table where each byte indicates queue number. ETHTOOL_A_RSS_INPUT_XFRM attribute is a bitmap indicating the type of transformation applied to the input protocol fields before given to the RSS -hfunc. Current supported option is symmetric-xor. +hfunc. Current supported options are symmetric-xor and symmetric-or-xor. PLCA_GET_CFG ============ diff --git a/Documentation/networking/scaling.rst b/Documentation/networking/scaling.rst index 4eb50bcb9d42..6984700cec6a 100644 --- a/Documentation/networking/scaling.rst +++ b/Documentation/networking/scaling.rst @@ -49,14 +49,21 @@ destination address) and TCP/UDP (source port, destination port) tuples are swapped, the computed hash is the same. This is beneficial in some applications that monitor TCP/IP flows (IDS, firewalls, ...etc) and need both directions of the flow to land on the same Rx queue (and CPU). The -"Symmetric-XOR" is a type of RSS algorithms that achieves this hash -symmetry by XORing the input source and destination fields of the IP -and/or L4 protocols. This, however, results in reduced input entropy and -could potentially be exploited. Specifically, the algorithm XORs the input +"Symmetric-XOR" and "Symmetric-OR-XOR" are types of RSS algorithms that +achieve this hash symmetry by XOR/ORing the input source and destination +fields of the IP and/or L4 protocols. This, however, results in reduced +input entropy and could potentially be exploited. + +Specifically, the "Symmetric-XOR" algorithm XORs the input as follows:: # (SRC_IP ^ DST_IP, SRC_IP ^ DST_IP, SRC_PORT ^ DST_PORT, SRC_PORT ^ DST_PORT) +The "Symmetric-OR-XOR" algorithm, on the other hand, transforms the input as +follows:: + + # (SRC_IP | DST_IP, SRC_IP ^ DST_IP, SRC_PORT | DST_PORT, SRC_PORT ^ DST_PORT) + The result is then fed to the underlying RSS algorithm. Some advanced NICs allow steering packets to queues based on diff --git a/drivers/net/ethernet/intel/iavf/iavf_ethtool.c b/drivers/net/ethernet/intel/iavf/iavf_ethtool.c index 74a1e9fe1821..288bb5b2e72e 100644 --- a/drivers/net/ethernet/intel/iavf/iavf_ethtool.c +++ b/drivers/net/ethernet/intel/iavf/iavf_ethtool.c @@ -1808,7 +1808,7 @@ static int iavf_set_rxfh(struct net_device *netdev, static const struct ethtool_ops iavf_ethtool_ops = { .supported_coalesce_params = ETHTOOL_COALESCE_USECS | ETHTOOL_COALESCE_USE_ADAPTIVE, - .cap_rss_sym_xor_supported = true, + .supported_input_xfrm = RXH_XFRM_SYM_XOR, .get_drvinfo = iavf_get_drvinfo, .get_link = ethtool_op_get_link, .get_ringparam = iavf_get_ringparam, diff --git a/drivers/net/ethernet/intel/ice/ice_ethtool.c b/drivers/net/ethernet/intel/ice/ice_ethtool.c index b0805704834d..7c2dc347e4e5 100644 --- a/drivers/net/ethernet/intel/ice/ice_ethtool.c +++ b/drivers/net/ethernet/intel/ice/ice_ethtool.c @@ -4770,7 +4770,7 @@ static const struct ethtool_ops ice_ethtool_ops = { .supported_coalesce_params = ETHTOOL_COALESCE_USECS | ETHTOOL_COALESCE_USE_ADAPTIVE | ETHTOOL_COALESCE_RX_USECS_HIGH, - .cap_rss_sym_xor_supported = true, + .supported_input_xfrm = RXH_XFRM_SYM_XOR, .rxfh_per_ctx_key = true, .get_link_ksettings = ice_get_link_ksettings, .set_link_ksettings = ice_set_link_ksettings, diff --git a/include/linux/ethtool.h b/include/linux/ethtool.h index 870994cc3ef7..7f222dccc7d1 100644 --- a/include/linux/ethtool.h +++ b/include/linux/ethtool.h @@ -763,13 +763,12 @@ struct kernel_ethtool_ts_info { /** * struct ethtool_ops - optional netdev operations + * @supported_input_xfrm: supported types of input xfrm from %RXH_XFRM_*. * @cap_link_lanes_supported: indicates if the driver supports lanes * parameter. * @cap_rss_ctx_supported: indicates if the driver supports RSS * contexts via legacy API, drivers implementing @create_rxfh_context * do not have to set this bit. - * @cap_rss_sym_xor_supported: indicates if the driver supports symmetric-xor - * RSS. * @rxfh_per_ctx_key: device supports setting different RSS key for each * additional context. Netlink API should report hfunc, key, and input_xfrm * for every context, not just context 0. @@ -995,9 +994,9 @@ struct kernel_ethtool_ts_info { * of the generic netdev features interface. */ struct ethtool_ops { + u32 supported_input_xfrm:8; u32 cap_link_lanes_supported:1; u32 cap_rss_ctx_supported:1; - u32 cap_rss_sym_xor_supported:1; u32 rxfh_per_ctx_key:1; u32 cap_rss_rxnfc_adds:1; u32 rxfh_indir_space; diff --git a/include/uapi/linux/ethtool.h b/include/uapi/linux/ethtool.h index 2feba0929a8a..84833cca29fe 100644 --- a/include/uapi/linux/ethtool.h +++ b/include/uapi/linux/ethtool.h @@ -2289,6 +2289,10 @@ static inline int ethtool_validate_duplex(__u8 duplex) * be exploited to reduce the RSS queue spread. */ #define RXH_XFRM_SYM_XOR (1 << 0) +/* Similar to SYM_XOR, except that one copy of the XOR'ed fields is replaced by + * an OR of the same fields + */ +#define RXH_XFRM_SYM_OR_XOR (1 << 1) #define RXH_XFRM_NO_CHANGE 0xff /* L2-L4 network traffic flow types */ diff --git a/net/ethtool/ioctl.c b/net/ethtool/ioctl.c index 271c7cef9ef3..77d714874eca 100644 --- a/net/ethtool/ioctl.c +++ b/net/ethtool/ioctl.c @@ -1011,11 +1011,11 @@ static noinline_for_stack int ethtool_set_rxnfc(struct net_device *dev, if (rc) return rc; - /* Sanity check: if symmetric-xor is set, then: + /* Sanity check: if symmetric-xor/symmetric-or-xor is set, then: * 1 - no other fields besides IP src/dst and/or L4 src/dst * 2 - If src is set, dst must also be set */ - if ((rxfh.input_xfrm & RXH_XFRM_SYM_XOR) && + if ((rxfh.input_xfrm & (RXH_XFRM_SYM_XOR | RXH_XFRM_SYM_OR_XOR)) && ((info.data & ~(RXH_IP_SRC | RXH_IP_DST | RXH_L4_B_0_1 | RXH_L4_B_2_3)) || (!!(info.data & RXH_IP_SRC) ^ !!(info.data & RXH_IP_DST)) || @@ -1388,11 +1388,11 @@ static noinline_for_stack int ethtool_set_rxfh(struct net_device *dev, return -EOPNOTSUPP; /* Check input data transformation capabilities */ if (rxfh.input_xfrm && rxfh.input_xfrm != RXH_XFRM_SYM_XOR && + rxfh.input_xfrm != RXH_XFRM_SYM_OR_XOR && rxfh.input_xfrm != RXH_XFRM_NO_CHANGE) return -EINVAL; if (rxfh.input_xfrm != RXH_XFRM_NO_CHANGE && - (rxfh.input_xfrm & RXH_XFRM_SYM_XOR) && - !ops->cap_rss_sym_xor_supported) + rxfh.input_xfrm & ~ops->supported_input_xfrm) return -EOPNOTSUPP; create = rxfh.rss_context == ETH_RXFH_CONTEXT_ALLOC;