RDMA/erdma: Add disassociate ucontext support

All IO pages mapped to user space are handled by rdma_user_mmap_io,
so add empty stub for disassociate ucontext.
Signed-off-by: Cheng Xu <chengyou@linux.alibaba.com>
Link: https://patch.msgid.link/20240902112920.58749-3-chengyou@linux.alibaba.comSigned-off-by: Leon Romanovsky <leon@kernel.org>

drivers/infiniband/hw/erdma/erdma_main.c

@@ -490,6 +490,7 @@ static const struct ib_device_ops erdma_device_ops = {
 	.dereg_mr = erdma_dereg_mr,
 	.destroy_cq = erdma_destroy_cq,
 	.destroy_qp = erdma_destroy_qp,
+	.disassociate_ucontext = erdma_disassociate_ucontext,
 	.get_dma_mr = erdma_get_dma_mr,
 	.get_hw_stats = erdma_get_hw_stats,
 	.get_port_immutable = erdma_get_port_immutable,

drivers/infiniband/hw/erdma/erdma_verbs.c

@@ -1701,6 +1701,10 @@ int erdma_create_cq(struct ib_cq *ibcq, const struct ib_cq_init_attr *attr,
 	return ret;
 }
 
+void erdma_disassociate_ucontext(struct ib_ucontext *ibcontext)
+{
+}
+
 void erdma_set_mtu(struct erdma_dev *dev, u32 mtu)
 {
 	struct erdma_cmdq_config_mtu_req req;

drivers/infiniband/hw/erdma/erdma_verbs.h

@@ -344,6 +344,7 @@ int erdma_modify_qp(struct ib_qp *ibqp, struct ib_qp_attr *attr, int mask,
 		    struct ib_udata *data);
 int erdma_destroy_qp(struct ib_qp *ibqp, struct ib_udata *udata);
 int erdma_destroy_cq(struct ib_cq *ibcq, struct ib_udata *udata);
+void erdma_disassociate_ucontext(struct ib_ucontext *ibcontext);
 int erdma_req_notify_cq(struct ib_cq *ibcq, enum ib_cq_notify_flags flags);
 struct ib_mr *erdma_reg_user_mr(struct ib_pd *ibpd, u64 start, u64 len,
 				u64 virt, int access, struct ib_udata *udata);