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Thu, 18 Dec 2025 07:58:33 -0800 From: Edward Srouji To: , Leon Romanovsky , Saeed Mahameed , Tariq Toukan , Mark Bloch , Andrew Lunn , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Jason Gunthorpe CC: , , , Or Har-Toov Subject: [PATCH rdma-next 06/10] IB/core: Add helper to convert port attributes to data rate Date: Thu, 18 Dec 2025 17:58:32 +0200 Message-ID: <20251218-vf-bw-lag-mode-v1-6-7d8ed4368bea@nvidia.com> X-Mailer: git-send-email 2.49.0 In-Reply-To: <20251218-vf-bw-lag-mode-v1-0-7d8ed4368bea@nvidia.com> References: <20251218-vf-bw-lag-mode-v1-0-7d8ed4368bea@nvidia.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" X-Mailer: b4 0.14.3 X-Developer-Signature: v=1; a=ed25519-sha256; t=1766069544; l=3311; i=edwards@nvidia.com; s=20251029; h=from:subject:message-id; bh=1KbwFRkFYU9DgsLWpVgIh9uLuiiwUdy6L5df/5FOubw=; b=4CRs3w/IVJo48ZV4dhv3+tKwEZqg4sRwepa0iP9u4S/8EXoQ7NZI3kEGuzf1g8VZ5bacLgfyE i2Sku33BNovDSeXbdnGfGOie1G9V8VD6K3s9ZYgcHhV69NI7xM1hDb3 X-Developer-Key: i=edwards@nvidia.com; a=ed25519; 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X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 18 Dec 2025 15:59:01.1899 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 34948929-1e71-4cdb-2c42-08de3e4e5c7f X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a;Ip=[216.228.117.160];Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: CH1PEPF0000AD74.namprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: PH7PR12MB7968 From: Or Har-Toov Introduce ib_port_attr_to_rate() to compute the data rate in 100 Mbps units (deci-Gb/sec) from a port's active_speed and active_width attributes. This generic helper removes duplicated speed-to-rate calculations, which are used by sysfs and the upcoming new verb. Signed-off-by: Or Har-Toov Reviewed-by: Mark Bloch Signed-off-by: Edward Srouji --- drivers/infiniband/core/verbs.c | 51 +++++++++++++++++++++++++++++++++++++= ++++ include/rdma/ib_verbs.h | 14 +++++++++++ 2 files changed, 65 insertions(+) diff --git a/drivers/infiniband/core/verbs.c b/drivers/infiniband/core/verb= s.c index f495a2182c84..8b56b6b62352 100644 --- a/drivers/infiniband/core/verbs.c +++ b/drivers/infiniband/core/verbs.c @@ -217,6 +217,57 @@ __attribute_const__ int ib_rate_to_mbps(enum ib_rate r= ate) } EXPORT_SYMBOL(ib_rate_to_mbps); =20 +struct ib_speed_attr { + const char *str; + int speed; +}; + +#define IB_SPEED_ATTR(speed_type, _str, _speed) \ + [speed_type] =3D {.str =3D _str, .speed =3D _speed} + +static const struct ib_speed_attr ib_speed_attrs[] =3D { + IB_SPEED_ATTR(IB_SPEED_SDR, " SDR", 25), + IB_SPEED_ATTR(IB_SPEED_DDR, " DDR", 50), + IB_SPEED_ATTR(IB_SPEED_QDR, " QDR", 100), + IB_SPEED_ATTR(IB_SPEED_FDR10, " FDR10", 100), + IB_SPEED_ATTR(IB_SPEED_FDR, " FDR", 140), + IB_SPEED_ATTR(IB_SPEED_EDR, " EDR", 250), + IB_SPEED_ATTR(IB_SPEED_HDR, " HDR", 500), + IB_SPEED_ATTR(IB_SPEED_NDR, " NDR", 1000), + IB_SPEED_ATTR(IB_SPEED_XDR, " XDR", 2000), +}; + +int ib_port_attr_to_speed_info(struct ib_port_attr *attr, + struct ib_port_speed_info *speed_info) +{ + int speed_idx =3D attr->active_speed; + + switch (attr->active_speed) { + case IB_SPEED_DDR: + case IB_SPEED_QDR: + case IB_SPEED_FDR10: + case IB_SPEED_FDR: + case IB_SPEED_EDR: + case IB_SPEED_HDR: + case IB_SPEED_NDR: + case IB_SPEED_XDR: + case IB_SPEED_SDR: + break; + default: + speed_idx =3D IB_SPEED_SDR; /* Default to SDR for invalid rates */ + break; + } + + speed_info->str =3D ib_speed_attrs[speed_idx].str; + speed_info->rate =3D ib_speed_attrs[speed_idx].speed; + speed_info->rate *=3D ib_width_enum_to_int(attr->active_width); + if (speed_info->rate < 0) + return -EINVAL; + + return 0; +} +EXPORT_SYMBOL(ib_port_attr_to_speed_info); + __attribute_const__ enum rdma_transport_type rdma_node_get_transport(unsigned int node_type) { diff --git a/include/rdma/ib_verbs.h b/include/rdma/ib_verbs.h index 95f1e557cbb8..b984f9581a73 100644 --- a/include/rdma/ib_verbs.h +++ b/include/rdma/ib_verbs.h @@ -878,6 +878,20 @@ __attribute_const__ int ib_rate_to_mult(enum ib_rate r= ate); */ __attribute_const__ int ib_rate_to_mbps(enum ib_rate rate); =20 +struct ib_port_speed_info { + const char *str; + int rate; /* in deci-Gb/sec (100 MBps units) */ +}; + +/** + * ib_port_attr_to_speed_info - Convert port attributes to speed informati= on + * @attr: Port attributes containing active_speed and active_width + * @speed_info: Speed information to return + * + * Returns 0 on success, -EINVAL on error. + */ +int ib_port_attr_to_speed_info(struct ib_port_attr *attr, + struct ib_port_speed_info *speed_info); =20 /** * enum ib_mr_type - memory region type --=20 2.47.1