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 <[e-mail]>
Signed-off-by: Jason Gunthorpe <[e-mail]>

drivers/infiniband/hw/bnxt_re/ib_verbs.c

···
 					   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",
···
 	}
 	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;

include/uapi/rdma/bnxt_re-abi.h

···
 
 #define BNXT_RE_ABI_VERSION	1
 
+#define BNXT_RE_CHIP_ID0_CHIP_NUM_SFT		0x00
+#define BNXT_RE_CHIP_ID0_CHIP_REV_SFT		0x10
+#define BNXT_RE_CHIP_ID0_CHIP_MET_SFT		0x18
+
+enum {
+	BNXT_RE_UCNTX_CMASK_HAVE_CCTX = 0x1ULL
+};
+
 struct bnxt_re_uctx_resp {
 	__u32 dev_id;
 	__u32 max_qp;
···
 	__u32 cqe_sz;
 	__u32 max_cqd;
 	__u32 rsvd;
+	__aligned_u64 comp_mask;
+	__u32 chip_id0;
+	__u32 chip_id1;
 };
 
 /*