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RDMA/bnxt_re: Enable variable size WQEs for user space applications
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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 <hongguang.gao@broadcom.com>
Signed-off-by: Selvin Xavier <selvin.xavier@broadcom.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
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Selvin Xavier authored and Jason Gunthorpe committed Aug 27, 2024
1 parent d8ea645 commit 10a104c
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Showing 2 changed files with 6 additions and 0 deletions.
5 changes: 5 additions & 0 deletions drivers/infiniband/hw/bnxt_re/ib_verbs.c
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Original file line number Diff line number Diff line change
Expand Up @@ -4233,6 +4233,11 @@ int bnxt_re_alloc_ucontext(struct ib_ucontext *ctx, struct ib_udata *udata)
resp.comp_mask |= BNXT_RE_UCNTX_CMASK_POW2_DISABLED;
uctx->cmask |= BNXT_RE_UCNTX_CAP_POW2_DISABLED;
}
if (ureq.comp_mask & BNXT_RE_COMP_MASK_REQ_UCNTX_VAR_WQE_SUPPORT) {
resp.comp_mask |= BNXT_RE_UCNTX_CMASK_HAVE_MODE;
resp.mode = rdev->chip_ctx->modes.wqe_mode;
uctx->cmask |= BNXT_RE_UCNTX_CAP_VAR_WQE_ENABLED;
}
}

rc = ib_copy_to_udata(udata, &resp, min(udata->outlen, sizeof(resp)));
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1 change: 1 addition & 0 deletions include/uapi/rdma/bnxt_re-abi.h
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Expand Up @@ -66,6 +66,7 @@ enum bnxt_re_wqe_mode {

enum {
BNXT_RE_COMP_MASK_REQ_UCNTX_POW2_SUPPORT = 0x01,
BNXT_RE_COMP_MASK_REQ_UCNTX_VAR_WQE_SUPPORT = 0x02,
};

struct bnxt_re_uctx_req {
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