ib_verbs.h

h内核

struct ib_client {
	char  *name;
	void (*add)   (struct ib_device *);
	void (*remove)(struct ib_device *);

	struct list_head list;
};

struct ib_device *ib_alloc_device(size_t size);
void ib_dealloc_device(struct ib_device *device);

int ib_register_device   (struct ib_device *device);
void ib_unregister_device(struct ib_device *device);

int ib_register_client   (struct ib_client *client);
void ib_unregister_client(struct ib_client *client);

void *ib_get_client_data(struct ib_device *device, struct ib_client *client);
void  ib_set_client_data(struct ib_device *device, struct ib_client *client,
			 void *data);

int ib_register_event_handler  (struct ib_event_handler *event_handler);
int ib_unregister_event_handler(struct ib_event_handler *event_handler);
void ib_dispatch_event(struct ib_event *event);

int ib_query_device(struct ib_device *device,
		    struct ib_device_attr *device_attr);

int ib_query_port(struct ib_device *device,
		  u8 port_num, struct ib_port_attr *port_attr);

int ib_query_gid(struct ib_device *device,
		 u8 port_num, int index, union ib_gid *gid);

int ib_query_pkey(struct ib_device *device,
		  u8 port_num, u16 index, u16 *pkey);

int ib_modify_device(struct ib_device *device,
		     int device_modify_mask,
		     struct ib_device_modify *device_modify);

int ib_modify_port(struct ib_device *device,
		   u8 port_num, int port_modify_mask,
		   struct ib_port_modify *port_modify);

/**
 * ib_alloc_pd - Allocates an unused protection domain.
 * @device: The device on which to allocate the protection domain.
 *
 * A protection domain object provides an association between QPs, shared
 * receive queues, address handles, memory regions, and memory windows.
 */
struct ib_pd *ib_alloc_pd(struct ib_device *device);

/**
 * ib_dealloc_pd - Deallocates a protection domain.
 * @pd: The protection domain to deallocate.
 */
int ib_dealloc_pd(struct ib_pd *pd);

/**
 * ib_create_ah - Creates an address handle for the given address vector.
 * @pd: The protection domain associated with the address handle.
 * @ah_attr: The attributes of the address vector.
 *
 * The address handle is used to reference a local or global destination
 * in all UD QP post sends.
 */
struct ib_ah *ib_create_ah(struct ib_pd *pd, struct ib_ah_attr *ah_attr);

/**
 * ib_modify_ah - Modifies the address vector associated with an address
 *   handle.
 * @ah: The address handle to modify.
 * @ah_attr: The new address vector attributes to associate with the
 *   address handle.
 */
int ib_modify_ah(struct ib_ah *ah, struct ib_ah_attr *ah_attr);

/**
 * ib_query_ah - Queries the address vector associated with an address
 *   handle.
 * @ah: The address handle to query.
 * @ah_attr: The address vector attributes associated with the address
 *   handle.
 */
int ib_query_ah(struct ib_ah *ah, struct ib_ah_attr *ah_attr);

/**
 * ib_destroy_ah - Destroys an address handle.
 * @ah: The address handle to destroy.
 */
int ib_destroy_ah(struct ib_ah *ah);

/**
 * ib_create_qp - Creates a QP associated with the specified protection
 *   domain.
 * @pd: The protection domain associated with the QP.
 * @qp_init_attr: A list of initial attributes required to create the QP.
 */
struct ib_qp *ib_create_qp(struct ib_pd *pd,
			   struct ib_qp_init_attr *qp_init_attr);

/**
 * ib_modify_qp - Modifies the attributes for the specified QP and then
 *   transitions the QP to the given state.
 * @qp: The QP to modify.
 * @qp_attr: On input, specifies the QP attributes to modify.  On output,
 *   the current values of selected QP attributes are returned.
 * @qp_attr_mask: A bit-mask used to specify which attributes of the QP
 *   are being modified.
 */
int ib_modify_qp(struct ib_qp *qp,
		 struct ib_qp_attr *qp_attr,
		 int qp_attr_mask);

/**
 * ib_query_qp - Returns the attribute list and current values for the
 *   specified QP.
 * @qp: The QP to query.
 * @qp_attr: The attributes of the specified QP.
 * @qp_attr_mask: A bit-mask used to select specific attributes to query.
 * @qp_init_attr: Additional attributes of the selected QP.
 *
 * The qp_attr_mask may be used to limit the query to gathering only the
 * selected attributes.
 */
int ib_query_qp(struct ib_qp *qp,
		struct ib_qp_attr *qp_attr,
		int qp_attr_mask,
		struct ib_qp_init_attr *qp_init_attr);

/**
 * ib_destroy_qp - Destroys the specified QP.
 * @qp: The QP to destroy.
 */
int ib_destroy_qp(struct ib_qp *qp);

/**
 * ib_post_send - Posts a list of work requests to the send queue of
 *   the specified QP.
 * @qp: The QP to post the work request on.
 * @send_wr: A list of work requests to post on the send queue.
 * @bad_send_wr: On an immediate failure, this parameter will reference
 *   the work request that failed to be posted on the QP.
 */
static inline int ib_post_send(struct ib_qp *qp,
			       struct ib_send_wr *send_wr,
			       struct ib_send_wr **bad_send_wr)
{
	return qp->device->post_send(qp, send_wr, bad_send_wr);
}

/**
 * ib_post_recv - Posts a list of work requests to the receive queue of
 *   the specified QP.
 * @qp: The QP to post the work request on.
 * @recv_wr: A list of work requests to post on the receive queue.
 * @bad_recv_wr: On an immediate failure, this parameter will reference
 *   the work request that failed to be posted on the QP.
 */
static inline int ib_post_recv(struct ib_qp *qp,
			       struct ib_recv_wr *recv_wr,
			       struct ib_recv_wr **bad_recv_wr)
{
	return qp->device->post_recv(qp, recv_wr, bad_recv_wr);
}

/**
 * ib_create_cq - Creates a CQ on the specified device.
 * @device: The device on which to create the CQ.
 * @comp_handler: A user-specified callback that is invoked when a
 *   completion event occurs on the CQ.
 * @event_handler: A user-specified callback that is invoked when an
 *   asynchronous event not associated with a completion occurs on the CQ.
 * @cq_context: Context associated with the CQ returned to the user via
 *   the associated completion and event handlers.
 * @cqe: The minimum size of the CQ.
 *
 * Users can examine the cq structure to determine the actual CQ size.
 */
struct ib_cq *ib_create_cq(struct ib_device *device,
			   ib_comp_handler comp_handler,
			   void (*event_handler)(struct ib_event *, void *),
			   void *cq_context, int cqe);

/**
 * ib_resize_cq - Modifies the capacity of the CQ.
 * @cq: The CQ to resize.
 * @cqe: The minimum size of the CQ.
 *
 * Users can examine the cq structure to determine the actual CQ size.
 */
int ib_resize_cq(struct ib_cq *cq, int cqe);

/**
 * ib_destroy_cq - Destroys the specified CQ.
 * @cq: The CQ to destroy.
 */
int ib_destroy_cq(struct ib_cq *cq);

/**
 * ib_poll_cq - poll a CQ for completion(s)
 * @cq:the CQ being polled
 * @num_entries:maximum number of completions to return
 * @wc:array of at least @num_entries &struct ib_wc where completions
 *   will be returned
 *
 * Poll a CQ for (possibly multiple) completions.  If the return value
 * is < 0, an error occurred.  If the return value is >= 0, it is the
 * number of completions returned.  If the return value is
 * non-negative and < num_entries, then the CQ was emptied.
 */
static inline int ib_poll_cq(struct ib_cq *cq, int num_entries,
			     struct ib_wc *wc)
{
	return cq->device->poll_cq(cq, num_entries, wc);
}

/**
 * ib_peek_cq - Returns the number of unreaped completions currently
 *   on the specified CQ.
 * @cq: The CQ to peek.
 * @wc_cnt: A minimum number of unreaped completions to check for.
 *
 * If the number of unreaped completions is greater than or equal to wc_cnt,
 * this function returns wc_cnt, otherwise, it returns the actual number of
 * unreaped completions.
 */
int ib_peek_cq(struct ib_cq *cq, int wc_cnt);

/**
 * ib_req_notify_cq - Request completion notification on a CQ.
 * @cq: The CQ to generate an event for.
 * @cq_notify: If set to %IB_CQ_SOLICITED, completion notification will
 *   occur on the next solicited event. If set to %IB_CQ_NEXT_COMP,
 *   notification will occur on the next completion.
 */
static inline int ib_req_notify_cq(struct ib_cq *cq,
				   enum ib_cq_notify cq_notify)
{
	return cq->device->req_notify_cq(cq, cq_notify);
}

/**
 * ib_req_ncomp_notif - Request completion notification when there are
 *   at least the specified number of unreaped completions on the CQ.
 * @cq: The CQ to generate an event for.
 * @wc_cnt: The number of unreaped completions that should be on the
 *   CQ before an event is generated.
 */
static inline int ib_req_ncomp_notif(struct ib_cq *cq, int wc_cnt)
{
	return cq->device->req_ncomp_notif ?
		cq->device->req_ncomp_notif(cq, wc_cnt) :
		-ENOSYS;
}

/**
 * ib_get_dma_mr - Returns a memory region for system memory that is
 *   usable for DMA.
 * @pd: The protection domain associated with the memory region.
 * @mr_access_flags: Specifies the memory access rights.
 */
struct ib_mr *ib_get_dma_mr(struct ib_pd *pd, int mr_access_flags);

/**
 * ib_reg_phys_mr - Prepares a virtually addressed memory region for use
 *   by an HCA.
 * @pd: The protection domain associated assigned to the registered region.
 * @phys_buf_array: Specifies a list of physical buffers to use in the
 *   memory region.
 * @num_phys_buf: Specifies the size of the phys_buf_array.
 * @mr_access_flags: Specifies the memory access rights.
 * @iova_start: The offset of the region's starting I/O virtual address.
 */
struct ib_mr *ib_reg_phys_mr(struct ib_pd *pd,
			     struct ib_phys_buf *phys_buf_array,
			     int num_phys_buf,
			     int mr_access_flags,
			     u64 *iova_start);

/**
 * ib_rereg_phys_mr - Modifies the attributes of an existing memory region.
 *   Conceptually, this call performs the functions deregister memory region
 *   followed by register physical memory region.  Where possible,
 *   resources are reused instead of deallocated and reallocated.
 * @mr: The memory region to modify.
 * @mr_rereg_mask: A bit-mask used to indicate which of the following
 *   properties of the memory region are being modified.
 * @pd: If %IB_MR_REREG_PD is set in mr_rereg_mask, this field specifies
 *   the new protection domain to associated with the memory region,
 *   otherwise, this parameter is ignored.
 * @phys_buf_array: If %IB_MR_REREG_TRANS is set in mr_rereg_mask, this
 *   field specifies a list of physical buffers to use in the new
 *   translation, otherwise, this parameter is ignored.
 * @num_phys_buf: If %IB_MR_REREG_TRANS is set in mr_rereg_mask, this
 *   field specifies the size of the phys_buf_array, otherwise, this
 *   parameter is ignored.
 * @mr_access_flags: If %IB_MR_REREG_ACCESS is set in mr_rereg_mask, this
 *   field specifies the new memory access rights, otherwise, this
 *   parameter is ignored.
 * @iova_start: The offset of the region's starting I/O virtual address.
 */
int ib_rereg_phys_mr(struct ib_mr *mr,
		     int mr_rereg_mask,
		     struct ib_pd *pd,
		     struct ib_phys_buf *phys_buf_array,
		     int num_phys_buf,
		     int mr_access_flags,
		     u64 *iova_start);

/**
 * ib_query_mr - Retrieves information about a specific memory region.
 * @mr: The memory region to retrieve information about.
 * @mr_attr: The attributes of the specified memory region.
 */
int ib_query_mr(struct ib_mr *mr, struct ib_mr_attr *mr_attr);

/**
 * ib_dereg_mr - Deregisters a memory region and removes it from the
 *   HCA translation table.
 * @mr: The memory region to deregister.
 */
int ib_dereg_mr(struct ib_mr *mr);

/**
 * ib_alloc_mw - Allocates a memory window.
 * @pd: The protection domain associated with the memory window.
 */
struct ib_mw *ib_alloc_mw(struct ib_pd *pd);

/**
 * ib_bind_mw - Posts a work request to the send queue of the specified
 *   QP, which binds the memory window to the given address range and
 *   remote access attributes.
 * @qp: QP to post the bind work request on.
 * @mw: The memory window to bind.
 * @mw_bind: Specifies information about the memory window, including
 *   its address range, remote access rights, and associated memory region.
 */
static inline int ib_bind_mw(struct ib_qp *qp,
			     struct ib_mw *mw,
			     struct ib_mw_bind *mw_bind)
{
	/* XXX reference counting in corresponding MR? */
	return mw->device->bind_mw ?
		mw->device->bind_mw(qp, mw, mw_bind) :
		-ENOSYS;
}

/**
 * ib_dealloc_mw - Deallocates a memory window.
 * @mw: The memory window to deallocate.
 */
int ib_dealloc_mw(struct ib_mw *mw);

/**
 * ib_alloc_fmr - Allocates a unmapped fast memory region.
 * @pd: The protection domain associated with the unmapped region.
 * @mr_access_flags: Specifies the memory access rights.
 * @fmr_attr: Attributes of the unmapped region.
 *
 * A fast memory region must be mapped before it can be used as part of
 * a work request.
 */
struct ib_fmr *ib_alloc_fmr(struct ib_pd *pd,
			    int mr_access_flags,
			    struct ib_fmr_attr *fmr_attr);

/**
 * ib_map_phys_fmr - Maps a list of physical pages to a fast memory region.
 * @fmr: The fast memory region to associate with the pages.
 * @page_list: An array of physical pages to map to the fast memory region.
 * @list_len: The number of pages in page_list.
 * @iova: The I/O virtual address to use with the mapped region.
 */
static inline int ib_map_phys_fmr(struct ib_fmr *fmr,
				  u64 *page_list, int list_len,
				  u64 iova)
{
	return fmr->device->map_phys_fmr(fmr, page_list, list_len, iova);
}

/**
 * ib_unmap_fmr - Removes the mapping from a list of fast memory regions.
 * @fmr_list: A linked list of fast memory regions to unmap.
 */
int ib_unmap_fmr(struct list_head *fmr_list);

/**
 * ib_dealloc_fmr - Deallocates a fast memory region.
 * @fmr: The fast memory region to deallocate.
 */
int ib_dealloc_fmr(struct ib_fmr *fmr);

/**
 * ib_attach_mcast - Attaches the specified QP to a multicast group.
 * @qp: QP to attach to the multicast group.  The QP must be type
 *   IB_QPT_UD.
 * @gid: Multicast group GID.
 * @lid: Multicast group LID in host byte order.
 *
 * In order to send and receive multicast packets, subnet
 * administration must have created the multicast group and configured
 * the fabric appropriately.  The port associated with the specified
 * QP must also be a member of the multicast group.
 */
int ib_attach_mcast(struct ib_qp *qp, union ib_gid *gid, u16 lid);

/**
 * ib_detach_mcast - Detaches the specified QP from a multicast group.
 * @qp: QP to detach from the multicast group.
 * @gid: Multicast group GID.
 * @lid: Multicast group LID in host byte order.
 */
int ib_detach_mcast(struct ib_qp *qp, union ib_gid *gid, u16 lid);

#endif /* IB_VERBS_H */