drivers/infiniband/core/uverbs_std_types_srq.c

Source file repositories/reference/linux-study-clean/drivers/infiniband/core/uverbs_std_types_srq.c

File Facts

System
Linux kernel
Corpus path
drivers/infiniband/core/uverbs_std_types_srq.c
Extension
.c
Size
6607 bytes
Lines
235
Domain
Driver Families
Bucket
drivers/infiniband
Inferred role
Driver Families: implementation source
Status
source implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

Dependency Surface

Detected Declarations

Annotated Snippet

// SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB
/*
 * Copyright (c) 2020, Mellanox Technologies inc.  All rights reserved.
 */

#include <rdma/uverbs_std_types.h>
#include "rdma_core.h"
#include "uverbs.h"

static int uverbs_free_srq(struct ib_uobject *uobject,
		    enum rdma_remove_reason why,
		    struct uverbs_attr_bundle *attrs)
{
	struct ib_srq *srq = uobject->object;
	struct ib_uevent_object *uevent =
		container_of(uobject, struct ib_uevent_object, uobject);
	enum ib_srq_type srq_type = srq->srq_type;
	int ret;

	ret = ib_destroy_srq_user(srq, &attrs->driver_udata);
	if (ret)
		return ret;

	if (srq_type == IB_SRQT_XRC) {
		struct ib_usrq_object *us =
			container_of(uobject, struct ib_usrq_object,
				     uevent.uobject);

		atomic_dec(&us->uxrcd->refcnt);
	}

	ib_uverbs_release_uevent(uevent);
	return 0;
}

static int UVERBS_HANDLER(UVERBS_METHOD_SRQ_CREATE)(
	struct uverbs_attr_bundle *attrs)
{
	struct ib_usrq_object *obj = container_of(
		uverbs_attr_get_uobject(attrs, UVERBS_ATTR_CREATE_SRQ_HANDLE),
		typeof(*obj), uevent.uobject);
	struct ib_pd *pd =
		uverbs_attr_get_obj(attrs, UVERBS_ATTR_CREATE_SRQ_PD_HANDLE);
	struct ib_srq_init_attr attr = {};
	struct ib_uobject *xrcd_uobj;
	struct ib_srq *srq;
	u64 user_handle;
	int ret;

	ret = uverbs_copy_from(&attr.attr.max_sge, attrs,
			       UVERBS_ATTR_CREATE_SRQ_MAX_SGE);
	if (!ret)
		ret = uverbs_copy_from(&attr.attr.max_wr, attrs,
				       UVERBS_ATTR_CREATE_SRQ_MAX_WR);
	if (!ret)
		ret = uverbs_copy_from(&attr.attr.srq_limit, attrs,
				       UVERBS_ATTR_CREATE_SRQ_LIMIT);
	if (!ret)
		ret = uverbs_copy_from(&user_handle, attrs,
				       UVERBS_ATTR_CREATE_SRQ_USER_HANDLE);
	if (!ret)
		ret = uverbs_get_const(&attr.srq_type, attrs,
				       UVERBS_ATTR_CREATE_SRQ_TYPE);
	if (ret)
		return ret;

	if (ib_srq_has_cq(attr.srq_type)) {
		attr.ext.cq = uverbs_attr_get_obj(attrs,
					UVERBS_ATTR_CREATE_SRQ_CQ_HANDLE);
		if (IS_ERR(attr.ext.cq))
			return PTR_ERR(attr.ext.cq);
	}

	switch (attr.srq_type) {
	case IB_UVERBS_SRQT_XRC:
		xrcd_uobj = uverbs_attr_get_uobject(attrs,
					UVERBS_ATTR_CREATE_SRQ_XRCD_HANDLE);
		if (IS_ERR(xrcd_uobj))
			return PTR_ERR(xrcd_uobj);

		attr.ext.xrc.xrcd = (struct ib_xrcd *)xrcd_uobj->object;
		if (!attr.ext.xrc.xrcd)
			return -EINVAL;
		obj->uxrcd = container_of(xrcd_uobj, struct ib_uxrcd_object,
					  uobject);
		atomic_inc(&obj->uxrcd->refcnt);
		break;
	case IB_UVERBS_SRQT_TM:
		ret = uverbs_copy_from(&attr.ext.tag_matching.max_num_tags,
				       attrs,

Annotation

Implementation Notes