kernel/include/uapi/rdma/bnxt_re-abi.h, branch linux-6.18.y

RDMA/bnxt_re: Share a page to expose per SRQ info with userspace

2024-09-02T07:10:36Z

Gen P7 adapters needs to share a toggle bits information received in kernel driver with the user space. User space needs this info to arm the SRQ. User space application can get this page using the UAPI routines. Library will mmap this page and get the toggle bits to be used in the next ARM Doorbell. Uses a hash list to map the SRQ structure from the SRQ ID. SRQ structure is retrieved from the hash list while the library calls the UAPI routine to get the toggle page mapping. Currently the full page is mapped per SRQ. This can be optimized to enable multiple SRQs from the same application share the same page and different offsets in the page Signed-off-by: Chandramohan Akula Signed-off-by: Selvin Xavier Link: https://patch.msgid.link/1724945645-14989-4-git-send-email-selvin.xavier@broadcom.com Signed-off-by: Leon Romanovsky

RDMA/bnxt_re: Enable variable size WQEs for user space applications

2024-08-27T13:15:57Z

Add backward compatibility code to enable variable size WQEs only if the user lib supports it. Link: https://patch.msgid.link/r/1724042847-1481-6-git-send-email-selvin.xavier@broadcom.com Signed-off-by: Hongguang Gao Signed-off-by: Selvin Xavier Signed-off-by: Jason Gunthorpe

RDMA/bnxt_re: Handle variable WQE support for user applications

2024-08-27T13:15:57Z

User library calculates the number of slots required for user applications and it can pass that information to the driver. Driver can use this value and update the HW directly. This mechanism is currently used only for the newly introduced variable size WQEs. Extend the bnxt_re_qp_req structure to pass the Send Queue slot count. Reorganize the code to get the sq_slots before initializing the Send Queue attributes. Link: https://patch.msgid.link/r/1724042847-1481-5-git-send-email-selvin.xavier@broadcom.com Signed-off-by: Hongguang Gao Signed-off-by: Selvin Xavier Signed-off-by: Jason Gunthorpe

RDMA/bnxt_re: Expose the MSN table capability for user library

2024-05-30T10:28:02Z

BNXT_RE_COMP_MASK_UCNTX_HW_RETX_ENABLED was introduced to share the HW retransmit capability between driver and lib. The main difference in implementation for HW Retransmit support is the usage of MSN table or PSN table . When HW retrans is enabled, HW expects MSN table to be allocated by driver/lib, else PSN table (for older adapters). FW expose a new field which gives MSN capability. Drivers and libs can depend on the new field instead of HW Retrasns capability. For adapters which support HW_RETX feature, MSN table capability will be set. For older adapters, this value will be 0(to maintain backward compatibility with older FW). Rename UAPI just to capture the correct name of the HW capability that driver/library is interested in. No functional impact even if older rdma-core is used. Signed-off-by: Selvin Xavier Link: https://lore.kernel.org/r/1716876697-25970-3-git-send-email-selvin.xavier@broadcom.com Signed-off-by: Leon Romanovsky

RDMA/bnxt_re: Share a page to expose per CQ info with userspace

2023-12-17T13:35:58Z

Gen P7 adapters needs to share a toggle bits information received in kernel driver with the user space. User space needs this info during the request notify call back to arm the CQ. User space application can get this page using the UAPI routines. Library will mmap this page and get the toggle bits to be used in the next ARM Doorbell. Uses a hash list to map the CQ structure from the CQ ID. CQ structure is retrieved from the hash list while the library calls the UAPI routine to get the toggle page mapping. Currently the full page is mapped per CQ. This can be optimized to enable multiple CQs from the same application share the same page and different offsets in the page. Signed-off-by: Selvin Xavier Link: https://lore.kernel.org/r/1702535484-26844-3-git-send-email-selvin.xavier@broadcom.com Signed-off-by: Leon Romanovsky

RDMA/bnxt_re: Add UAPI to share a page with user space

2023-12-17T13:35:58Z

Gen P7 adapters require to share a toggle value for CQ and SRQ. This is received by the driver as part of interrupt notifications and needs to be shared with the user space. Add a new UAPI infrastructure to get the shared page for CQ and SRQ. Signed-off-by: Selvin Xavier Link: https://lore.kernel.org/r/1702535484-26844-2-git-send-email-selvin.xavier@broadcom.com Signed-off-by: Leon Romanovsky

RDMA/bnxt_re: Adds MSN table capability for Gen P7 adapters

2023-12-11T07:56:29Z

GenP7 HW expects an MSN table instead of PSN table. Check for the HW retransmission capability and populate the MSN table if HW retansmission is supported. Signed-off-by: Damodharam Ammepalli Signed-off-by: Selvin Xavier Link: https://lore.kernel.org/r/1701946060-13931-7-git-send-email-selvin.xavier@broadcom.com Signed-off-by: Leon Romanovsky

RDMA/bnxt_re: Remove roundup_pow_of_two depth for all hardware queue resources

2023-11-13T08:27:14Z

Rounding up the queue depth to power of two is not a hardware requirement. In order to optimize the per connection memory usage, removing drivers implementation which round up to the queue depths to the power of 2. Implements a mask to maintain backward compatibility with older library. Signed-off-by: Chandramohan Akula Signed-off-by: Selvin Xavier Link: https://lore.kernel.org/r/1698069803-1787-3-git-send-email-selvin.xavier@broadcom.com Signed-off-by: Leon Romanovsky

RDMA/bnxt_re: Add a new uapi for driver notification

2023-07-21T19:15:33Z

Add driver notify uapi for application notifying the driver about the doorbell FIFO congestion. Link: https://lore.kernel.org/r/1689742977-9128-8-git-send-email-selvin.xavier@broadcom.com Signed-off-by: Chandramohan Akula Signed-off-by: Selvin Xavier Signed-off-by: Jason Gunthorpe

RDMA/bnxt_re: Update alloc_page uapi for pacing

2023-07-21T19:15:32Z

Update the alloc_page uapi functionality for handling the mapping of doorbell pacing shared page and bar address. Link: https://lore.kernel.org/r/1689742977-9128-6-git-send-email-selvin.xavier@broadcom.com Signed-off-by: Chandramohan Akula Signed-off-by: Selvin Xavier Signed-off-by: Jason Gunthorpe