RDMA/bnxt_re: Add resize_cq support

Add resize_cq verb support for user space CQs. Resize operation for
kernel CQs are not supported now.

Driver should free the current CQ only after user library polls
for all the completions and switch to new CQ. So after the resize_cq
is returned from the driver, user library polls for existing completions
and store it as temporary data. Once library reaps all completions in the
current CQ, it invokes the ibv_cmd_poll_cq to inform the driver about
the resize_cq completion. Adding a check for user CQs in driver's
poll_cq and complete the resize operation for user CQs.
Updating uverbs_cmd_mask with poll_cq to support this.

Signed-off-by: Selvin Xavier <selvin.xavier@broadcom.com>
Link: https://lore.kernel.org/r/1678868215-23626-1-git-send-email-selvin.xavier@broadcom.com
Signed-off-by: Leon Romanovsky <leon@kernel.org>

1 files changed, 44 insertions, 0 deletions

diff --git a/drivers/infiniband/hw/bnxt_re/qplib_fp.c b/drivers/infiniband/hw/bnxt_re/qplib_fp.c
index 96e581ced50e..1d769a3106f6 100644
--- a/drivers/infiniband/hw/bnxt_re/qplib_fp.c
+++ b/drivers/infiniband/hw/bnxt_re/qplib_fp.c
@@ -2100,6 +2100,50 @@ exit:
 	return rc;
 }
 
+void bnxt_qplib_resize_cq_complete(struct bnxt_qplib_res *res,
+				   struct bnxt_qplib_cq *cq)
+{
+	bnxt_qplib_free_hwq(res, &cq->hwq);
+	memcpy(&cq->hwq, &cq->resize_hwq, sizeof(cq->hwq));
+}
+
+int bnxt_qplib_resize_cq(struct bnxt_qplib_res *res, struct bnxt_qplib_cq *cq,
+			 int new_cqes)
+{
+	struct bnxt_qplib_hwq_attr hwq_attr = {};
+	struct bnxt_qplib_rcfw *rcfw = res->rcfw;
+	struct creq_resize_cq_resp resp = {};
+	struct cmdq_resize_cq req = {};
+	struct bnxt_qplib_pbl *pbl;
+	u32 pg_sz, lvl, new_sz;
+	u16 cmd_flags = 0;
+	int rc;
+
+	RCFW_CMD_PREP(req, RESIZE_CQ, cmd_flags);
+	hwq_attr.sginfo = &cq->sg_info;
+	hwq_attr.res = res;
+	hwq_attr.depth = new_cqes;
+	hwq_attr.stride = sizeof(struct cq_base);
+	hwq_attr.type = HWQ_TYPE_QUEUE;
+	rc = bnxt_qplib_alloc_init_hwq(&cq->resize_hwq, &hwq_attr);
+	if (rc)
+		return rc;
+
+	req.cq_cid = cpu_to_le32(cq->id);
+	pbl = &cq->resize_hwq.pbl[PBL_LVL_0];
+	pg_sz = bnxt_qplib_base_pg_size(&cq->resize_hwq);
+	lvl = (cq->resize_hwq.level << CMDQ_RESIZE_CQ_LVL_SFT) &
+				       CMDQ_RESIZE_CQ_LVL_MASK;
+	new_sz = (new_cqes << CMDQ_RESIZE_CQ_NEW_CQ_SIZE_SFT) &
+		  CMDQ_RESIZE_CQ_NEW_CQ_SIZE_MASK;
+	req.new_cq_size_pg_size_lvl = cpu_to_le32(new_sz | pg_sz | lvl);
+	req.new_pbl = cpu_to_le64(pbl->pg_map_arr[0]);
+
+	rc = bnxt_qplib_rcfw_send_message(rcfw, (void *)&req,
+					  (void *)&resp, NULL, 0);
+	return rc;
+}
+
 int bnxt_qplib_destroy_cq(struct bnxt_qplib_res *res, struct bnxt_qplib_cq *cq)
 {
 	struct bnxt_qplib_rcfw *rcfw = res->rcfw;