RDMA/bnxt_re: Update kernel user abi to pass chip context

User space verbs provider library would need chip context.  Changing the
ABI to add chip version details in structure.  Furthermore, changing the
kernel driver ucontext allocation code to initialize the abi structure
with appropriate values.

As suggested by community, appended the new fields at the bottom of the
ABI structure and retaining to older fields as those were in the older
versions.

Keeping the ABI version at 1 and adding a new field in the ucontext
response structure to hold the component mask.  The user space library
should check pre-defined flags to figure out if a certain feature is
supported on not.

Signed-off-by: Devesh Sharma <devesh.sharma@broadcom.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>

1 files changed, 14 insertions, 3 deletions

diff --git a/drivers/infiniband/hw/bnxt_re/ib_verbs.c b/drivers/infiniband/hw/bnxt_re/ib_verbs.c
index 08c1725f371a..1d7469e23cde 100644
--- a/drivers/infiniband/hw/bnxt_re/ib_verbs.c
+++ b/drivers/infiniband/hw/bnxt_re/ib_verbs.c
@@ -3692,9 +3692,10 @@ struct ib_ucontext *bnxt_re_alloc_ucontext(struct ib_device *ibdev,
 					   struct ib_udata *udata)
 {
 	struct bnxt_re_dev *rdev = to_bnxt_re_dev(ibdev, ibdev);
+	struct bnxt_qplib_dev_attr *dev_attr = &rdev->dev_attr;
 	struct bnxt_re_uctx_resp resp;
 	struct bnxt_re_ucontext *uctx;
-	struct bnxt_qplib_dev_attr *dev_attr = &rdev->dev_attr;
+	u32 chip_met_rev_num = 0;
 	int rc;
 
 	dev_dbg(rdev_to_dev(rdev), "ABI version requested %d",
@@ -3719,14 +3720,24 @@ struct ib_ucontext *bnxt_re_alloc_ucontext(struct ib_device *ibdev,
 	}
 	spin_lock_init(&uctx->sh_lock);
 
-	resp.dev_id = rdev->en_dev->pdev->devfn; /*Temp, Use idr_alloc instead*/
+	resp.comp_mask |= BNXT_RE_UCNTX_CMASK_HAVE_CCTX;
+	chip_met_rev_num = rdev->chip_ctx.chip_num;
+	chip_met_rev_num |= ((u32)rdev->chip_ctx.chip_rev & 0xFF) <<
+			     BNXT_RE_CHIP_ID0_CHIP_REV_SFT;
+	chip_met_rev_num |= ((u32)rdev->chip_ctx.chip_metal & 0xFF) <<
+			     BNXT_RE_CHIP_ID0_CHIP_MET_SFT;
+	resp.chip_id0 = chip_met_rev_num;
+	/* Future extension of chip info */
+	resp.chip_id1 = 0;
+	/*Temp, Use idr_alloc instead */
+	resp.dev_id = rdev->en_dev->pdev->devfn;
 	resp.max_qp = rdev->qplib_ctx.qpc_count;
 	resp.pg_size = PAGE_SIZE;
 	resp.cqe_sz = sizeof(struct cq_base);
 	resp.max_cqd = dev_attr->max_cq_wqes;
 	resp.rsvd    = 0;
 
-	rc = ib_copy_to_udata(udata, &resp, sizeof(resp));
+	rc = ib_copy_to_udata(udata, &resp, min(udata->outlen, sizeof(resp)));
 	if (rc) {
 		dev_err(rdev_to_dev(rdev), "Failed to copy user context");
 		rc = -EFAULT;