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client-ip=216.228.117.161; helo=mail.nvidia.com; pr=C From: Parav Pandit To: , , CC: , , , , Parav Pandit Date: Wed, 5 Apr 2023 04:06:57 +0300 Message-ID: <20230405010657.612529-11-parav@nvidia.com> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20230405010657.612529-1-parav@nvidia.com> References: <20230405010657.612529-1-parav@nvidia.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain X-Originating-IP: [10.126.230.37] X-ClientProxiedBy: rnnvmail201.nvidia.com (10.129.68.8) To rnnvmail201.nvidia.com (10.129.68.8) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: BN8NAM11FT057:EE_|BL0PR12MB4930:EE_ X-MS-Office365-Filtering-Correlation-Id: a201c85b-edf4-4474-7afe-08db357221c8 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; 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:(13230028)(4636009)(346002)(136003)(376002)(39860400002)(396003)(451199021)(46966006)(36840700001)(26005)(1076003)(6666004)(107886003)(36756003)(86362001)(36860700001)(478600001)(40480700001)(82310400005)(16526019)(966005)(186003)(8676002)(70586007)(70206006)(2906002)(426003)(7636003)(356005)(336012)(83380400001)(47076005)(5660300002)(82740400003)(4326008)(316002)(2616005)(8936002)(54906003)(41300700001)(110136005);DIR:OUT;SFP:1101; X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 05 Apr 2023 01:07:31.0356 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: a201c85b-edf4-4474-7afe-08db357221c8 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: BN8NAM11FT057.eop-nam11.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: BL0PR12MB4930 Subject: [virtio-dev] [PATCH v12 10/10] virtio-net: Describe RSS using rss rq id The content of the indirection table and unclassified_queue were originally described based on mathematical operations. In order to make it easier to understand and to avoid intermixing the array index with the vq index, introduce a structure rss_rq_id (RSS receive queue ID) and use it to describe the unclassified_queue and indirection_table fields. As part of it, have the example that uses non-zero virtqueue index which helps to have better mapping between receiveX object with virtqueue index and the actual value in the indirection table. Fixes: https://github.com/oasis-tcs/virtio-spec/issues/163 Signed-off-by: Parav Pandit --- changelog: v11->v12: - use 'virtqueue index' instead of 'virtqueue number' v10->v11: - commit log updated to drop old reference to rq_handle, replaced with rss_rq_id detail v8->v9: - reword rss_rq_id and unclassified_packets description - use article - use 'vq number' instead of 'virtqueue number' v4->v5: - change subject to reflect rss_rq_id - fixed accidental removal of "unclassifed packets". - simplfied text around indirection_table mask to use the term destination receive virtqueue. This aligns with next line about queue reset. - removed rss_rq_id references as indirection table and unclassified_queue data type is self explanatory v3->v4: - renamed rq_handle to rss_rq_id - moved rss_rq_id definition close to its usage in rss_config struct v2->v3: - moved rq_handle definition before using it - removed duplicate example as rq_handle is now described first v0->v1: - new patch suggested by Michael Tsirkin --- device-types/net/description.tex | 27 ++++++++++++++++++++------- 1 file changed, 20 insertions(+), 7 deletions(-) diff --git a/device-types/net/description.tex b/device-types/net/description.tex index 435c1fc..4eb10d1 100644 --- a/device-types/net/description.tex +++ b/device-types/net/description.tex @@ -1423,11 +1423,16 @@ \subsubsection{Control Virtqueue}\label{sec:Device Types / Network Device / Devi Driver sends a VIRTIO_NET_CTRL_MQ_RSS_CONFIG command using the following format for \field{command-specific-data}: \begin{lstlisting} +struct rss_rq_id { + le16 vqn_1_16: 15; /* Bits 1 to 16 of the vq index */ + le16 reserved: 1; /* Set to zero */ +}; + struct virtio_net_rss_config { le32 hash_types; le16 indirection_table_mask; - le16 unclassified_queue; - le16 indirection_table[indirection_table_length]; + struct rss_rq_id unclassified_queue; + struct rss_rq_id indirection_table[indirection_table_length]; le16 max_tx_vq; u8 hash_key_length; u8 hash_key_data[hash_key_length]; @@ -1442,10 +1447,15 @@ \subsubsection{Control Virtqueue}\label{sec:Device Types / Network Device / Devi \field{indirection_table} array. Number of entries in \field{indirection_table} is (\field{indirection_table_mask} + 1). -Field \field{unclassified_queue} contains the 0-based index of -the receive virtqueue to place unclassified packets in. Index 0 corresponds to receiveq1. +\field{rss_rq_id} is a receive virtqueue id. \field{vqn_1_16} +consists of bits 1 to 16 of a vq index. For example, a +\field{vqn_1_16} value of 3 corresponds to vq index 6, +which maps to receiveq4. + +Field \field{unclassified_queue} contains the receive virtqueue +in which to place unclassified packets. -Field \field{indirection_table} contains an array of 0-based indices of receive virtqueues. Index 0 corresponds to receiveq1. +Field \field{indirection_table} is an array of receive virtqueues. A driver sets \field{max_tx_vq} to inform a device how many transmit virtqueues it may use (transmitq1\ldots transmitq \field{max_tx_vq}). @@ -1455,7 +1465,8 @@ \subsubsection{Control Virtqueue}\label{sec:Device Types / Network Device / Devi A driver MUST NOT send the VIRTIO_NET_CTRL_MQ_RSS_CONFIG command if the feature VIRTIO_NET_F_RSS has not been negotiated. -A driver MUST fill the \field{indirection_table} array only with indices of enabled queues. Index 0 corresponds to receiveq1. +A driver MUST fill the \field{indirection_table} array only with +enabled receive virtqueues. The number of entries in \field{indirection_table} (\field{indirection_table_mask} + 1) MUST be a power of two. @@ -1468,7 +1479,9 @@ \subsubsection{Control Virtqueue}\label{sec:Device Types / Network Device / Devi \begin{itemize} \item Calculate the hash of the packet as defined in \ref{sec:Device Types / Network Device / Device Operation / Processing of Incoming Packets / Hash calculation for incoming packets}. \item If the device did not calculate the hash for the specific packet, the device directs the packet to the receiveq specified by \field{unclassified_queue} of virtio_net_rss_config structure. -\item Apply \field{indirection_table_mask} to the calculated hash and use the result as the index in the indirection table to get 0-based number of destination receiveq. +\item Apply \field{indirection_table_mask} to the calculated hash +and use the result as the index in the indirection table to get +the destination receive virtqueue. \item If the destination receive queue is being reset (See \ref{sec:Basic Facilities of a Virtio Device / Virtqueues / Virtqueue Reset}), the device MUST drop the packet. \end{itemize} -- 2.26.2 --------------------------------------------------------------------- To unsubscribe, e-mail: virtio-dev-unsubscribe@lists.oasis-open.org For additional commands, e-mail: virtio-dev-help@lists.oasis-open.org