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

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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 <selvin.xavier@broadcom.com>
Link: https://lore.kernel.org/r/1716876697-25970-3-git-send-email-selvin.xavier@broadcom.com
Signed-off-by: Leon Romanovsky <leon@kernel.org>
This commit is contained in:
Selvin Xavier 2024-05-27 23:11:37 -07:00 committed by Leon Romanovsky
parent 8d310ba845
commit 6f6bfbc595
2 changed files with 4 additions and 1 deletions
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3
drivers/infiniband/hw/bnxt_re/ib_verbs.c
View File

@ -4201,6 +4201,9 @@ int bnxt_re_alloc_ucontext(struct ib_ucontext *ctx, struct ib_udata *udata)
if (rdev->pacing.dbr_pacing)
resp.comp_mask |= BNXT_RE_UCNTX_CMASK_DBR_PACING_ENABLED;
if (_is_host_msn_table(rdev->qplib_res.dattr->dev_cap_flags2))
resp.comp_mask |= BNXT_RE_UCNTX_CMASK_MSN_TABLE_ENABLED;
if (udata->inlen >= sizeof(ureq)) {
rc = ib_copy_from_udata(&ureq, udata, min(udata->inlen, sizeof(ureq)));
if (rc)

2
include/uapi/rdma/bnxt_re-abi.h
View File

@ -55,7 +55,7 @@ enum {
BNXT_RE_UCNTX_CMASK_WC_DPI_ENABLED = 0x04ULL,
BNXT_RE_UCNTX_CMASK_DBR_PACING_ENABLED = 0x08ULL,
BNXT_RE_UCNTX_CMASK_POW2_DISABLED = 0x10ULL,
BNXT_RE_COMP_MASK_UCNTX_HW_RETX_ENABLED = 0x40,
BNXT_RE_UCNTX_CMASK_MSN_TABLE_ENABLED = 0x40,
};
enum bnxt_re_wqe_mode {