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NTB: Alter MW API to support multi-ports devices

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Multi-port NTB devices permit to share a memory between all accessible peers.
Memory Windows API is altered to correspondingly initialize and map memory
windows for such devices:
 ntb_mw_count(pidx); - number of inbound memory windows, which can be allocated
for shared buffer with specified peer device.
 ntb_mw_get_align(pidx, widx); - get alignment and size restriction parameters
to properly allocate inbound memory region.
 ntb_peer_mw_count(); - get number of outbound memory windows.
 ntb_peer_mw_get_addr(widx); - get mapping address of an outbound memory window

If hardware supports inbound translation configured on the local ntb port:
 ntb_mw_set_trans(pidx, widx); - set translation address of allocated inbound
memory window so a peer device could access it.
 ntb_mw_clear_trans(pidx, widx); - clear the translation address of an inbound
memory window.

If hardware supports outbound translation configured on the peer ntb port:
 ntb_peer_mw_set_trans(pidx, widx); - set translation address of a memory
window retrieved from a peer device
 ntb_peer_mw_clear_trans(pidx, widx); - clear the translation address of an
outbound memory window

Signed-off-by: Serge Semin <fancer.lancer@gmail.com>
Acked-by: Allen Hubbe <Allen.Hubbe@dell.com>
Signed-off-by: Jon Mason <jdmason@kudzu.us>
This commit is contained in:
Serge Semin 2017-01-11 03:11:33 +03:00 • committed by Jon Mason
parent 4e8c11b7fd
commit 443b9a14ec
7 changed files with 340 additions and 105 deletions
Download patch file Download diff file Expand all files Collapse all files

204
include/linux/ntb.h
View file

@ -5,6 +5,7 @@
* GPL LICENSE SUMMARY
*
* Copyright (C) 2015 EMC Corporation. All Rights Reserved.
* Copyright (C) 2016 T-Platforms. All Rights Reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of version 2 of the GNU General Public License as
@ -18,6 +19,7 @@
* BSD LICENSE
*
* Copyright (C) 2015 EMC Corporation. All Rights Reserved.
* Copyright (C) 2016 T-Platforms. All Rights Reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
@ -201,9 +203,13 @@ static inline int ntb_ctx_ops_is_valid(const struct ntb_ctx_ops *ops)
* @link_enable: See ntb_link_enable().
* @link_disable: See ntb_link_disable().
* @mw_count: See ntb_mw_count().
* @mw_get_range: See ntb_mw_get_range().
* @mw_get_align: See ntb_mw_get_align().
* @mw_set_trans: See ntb_mw_set_trans().
* @mw_clear_trans: See ntb_mw_clear_trans().
* @peer_mw_count: See ntb_peer_mw_count().
* @peer_mw_get_addr: See ntb_peer_mw_get_addr().
* @peer_mw_set_trans: See ntb_peer_mw_set_trans().
* @peer_mw_clear_trans:See ntb_peer_mw_clear_trans().
* @db_is_unsafe: See ntb_db_is_unsafe().
* @db_valid_mask: See ntb_db_valid_mask().
* @db_vector_count: See ntb_db_vector_count().
@ -241,13 +247,20 @@ struct ntb_dev_ops {
enum ntb_speed max_speed, enum ntb_width max_width);
int (*link_disable)(struct ntb_dev *ntb);
int (*mw_count)(struct ntb_dev *ntb);
int (*mw_get_range)(struct ntb_dev *ntb, int idx,
phys_addr_t *base, resource_size_t *size,
resource_size_t *align, resource_size_t *align_size);
int (*mw_set_trans)(struct ntb_dev *ntb, int idx,
int (*mw_count)(struct ntb_dev *ntb, int pidx);
int (*mw_get_align)(struct ntb_dev *ntb, int pidx, int widx,
resource_size_t *addr_align,
resource_size_t *size_align,
resource_size_t *size_max);
int (*mw_set_trans)(struct ntb_dev *ntb, int pidx, int widx,
dma_addr_t addr, resource_size_t size);
int (*mw_clear_trans)(struct ntb_dev *ntb, int idx);
int (*mw_clear_trans)(struct ntb_dev *ntb, int pidx, int widx);
int (*peer_mw_count)(struct ntb_dev *ntb);
int (*peer_mw_get_addr)(struct ntb_dev *ntb, int widx,
phys_addr_t *base, resource_size_t *size);
int (*peer_mw_set_trans)(struct ntb_dev *ntb, int pidx, int widx,
u64 addr, resource_size_t size);
int (*peer_mw_clear_trans)(struct ntb_dev *ntb, int pidx, int widx);
int (*db_is_unsafe)(struct ntb_dev *ntb);
u64 (*db_valid_mask)(struct ntb_dev *ntb);
@ -295,9 +308,13 @@ static inline int ntb_dev_ops_is_valid(const struct ntb_dev_ops *ops)
ops->link_enable &&
ops->link_disable &&
ops->mw_count &&
ops->mw_get_range &&
ops->mw_set_trans &&
ops->mw_get_align &&
(ops->mw_set_trans ||
ops->peer_mw_set_trans) &&
/* ops->mw_clear_trans && */
ops->peer_mw_count &&
ops->peer_mw_get_addr &&
/* ops->peer_mw_clear_trans && */
/* ops->db_is_unsafe && */
ops->db_valid_mask &&
@ -655,79 +672,180 @@ static inline int ntb_link_disable(struct ntb_dev *ntb)
}
/**
* ntb_mw_count() - get the number of memory windows
* ntb_mw_count() - get the number of inbound memory windows, which could
* be created for a specified peer device
* @ntb: NTB device context.
* @pidx: Port index of peer device.
*
* Hardware and topology may support a different number of memory windows.
* Moreover different peer devices can support different number of memory
* windows. Simply speaking this method returns the number of possible inbound
* memory windows to share with specified peer device.
*
* Return: the number of memory windows.
*/
static inline int ntb_mw_count(struct ntb_dev *ntb)
static inline int ntb_mw_count(struct ntb_dev *ntb, int pidx)
{
return ntb->ops->mw_count(ntb);
return ntb->ops->mw_count(ntb, pidx);
}
/**
* ntb_mw_get_range() - get the range of a memory window
* ntb_mw_get_align() - get the restriction parameters of inbound memory window
* @ntb: NTB device context.
* @idx: Memory window number.
* @base: OUT - the base address for mapping the memory window
* @size: OUT - the size for mapping the memory window
* @align: OUT - the base alignment for translating the memory window
* @align_size: OUT - the size alignment for translating the memory window
* @pidx: Port index of peer device.
* @widx: Memory window index.
* @addr_align: OUT - the base alignment for translating the memory window
* @size_align: OUT - the size alignment for translating the memory window
* @size_max: OUT - the maximum size of the memory window
*
* Get the range of a memory window. NULL may be given for any output
* parameter if the value is not needed. The base and size may be used for
* mapping the memory window, to access the peer memory. The alignment and
* size may be used for translating the memory window, for the peer to access
* memory on the local system.
* Get the alignments of an inbound memory window with specified index.
* NULL may be given for any output parameter if the value is not needed.
* The alignment and size parameters may be used for allocation of proper
* shared memory.
*
* Return: Zero on success, otherwise an error number.
* Return: Zero on success, otherwise a negative error number.
*/
static inline int ntb_mw_get_range(struct ntb_dev *ntb, int idx,
phys_addr_t *base, resource_size_t *size,
resource_size_t *align, resource_size_t *align_size)
static inline int ntb_mw_get_align(struct ntb_dev *ntb, int pidx, int widx,
resource_size_t *addr_align,
resource_size_t *size_align,
resource_size_t *size_max)
{
return ntb->ops->mw_get_range(ntb, idx, base, size,
align, align_size);
return ntb->ops->mw_get_align(ntb, pidx, widx, addr_align, size_align,
size_max);
}
/**
* ntb_mw_set_trans() - set the translation of a memory window
* ntb_mw_set_trans() - set the translation of an inbound memory window
* @ntb: NTB device context.
* @idx: Memory window number.
* @addr: The dma address local memory to expose to the peer.
* @pidx: Port index of peer device.
* @widx: Memory window index.
* @addr: The dma address of local memory to expose to the peer.
* @size: The size of the local memory to expose to the peer.
*
* Set the translation of a memory window. The peer may access local memory
* through the window starting at the address, up to the size. The address
* must be aligned to the alignment specified by ntb_mw_get_range(). The size
* must be aligned to the size alignment specified by ntb_mw_get_range().
* and size must be aligned in compliance with restrictions of
* ntb_mw_get_align(). The region size should not exceed the size_max parameter
* of that method.
*
* This method may not be implemented due to the hardware specific memory
* windows interface.
*
* Return: Zero on success, otherwise an error number.
*/
static inline int ntb_mw_set_trans(struct ntb_dev *ntb, int idx,
static inline int ntb_mw_set_trans(struct ntb_dev *ntb, int pidx, int widx,
dma_addr_t addr, resource_size_t size)
{
return ntb->ops->mw_set_trans(ntb, idx, addr, size);
if (!ntb->ops->mw_set_trans)
return 0;
return ntb->ops->mw_set_trans(ntb, pidx, widx, addr, size);
}
/**
* ntb_mw_clear_trans() - clear the translation of a memory window
* ntb_mw_clear_trans() - clear the translation address of an inbound memory
* window
* @ntb: NTB device context.
* @idx: Memory window number.
* @pidx: Port index of peer device.
* @widx: Memory window index.
*
* Clear the translation of a memory window. The peer may no longer access
* local memory through the window.
* Clear the translation of an inbound memory window. The peer may no longer
* access local memory through the window.
*
* Return: Zero on success, otherwise an error number.
*/
static inline int ntb_mw_clear_trans(struct ntb_dev *ntb, int idx)
static inline int ntb_mw_clear_trans(struct ntb_dev *ntb, int pidx, int widx)
{
if (!ntb->ops->mw_clear_trans)
return ntb->ops->mw_set_trans(ntb, idx, 0, 0);
return ntb_mw_set_trans(ntb, pidx, widx, 0, 0);
return ntb->ops->mw_clear_trans(ntb, idx);
return ntb->ops->mw_clear_trans(ntb, pidx, widx);
}
/**
* ntb_peer_mw_count() - get the number of outbound memory windows, which could
* be mapped to access a shared memory
* @ntb: NTB device context.
*
* Hardware and topology may support a different number of memory windows.
* This method returns the number of outbound memory windows supported by
* local device.
*
* Return: the number of memory windows.
*/
static inline int ntb_peer_mw_count(struct ntb_dev *ntb)
{
return ntb->ops->peer_mw_count(ntb);
}
/**
* ntb_peer_mw_get_addr() - get map address of an outbound memory window
* @ntb: NTB device context.
* @widx: Memory window index (within ntb_peer_mw_count() return value).
* @base: OUT - the base address of mapping region.
* @size: OUT - the size of mapping region.
*
* Get base and size of memory region to map. NULL may be given for any output
* parameter if the value is not needed. The base and size may be used for
* mapping the memory window, to access the peer memory.
*
* Return: Zero on success, otherwise a negative error number.
*/
static inline int ntb_peer_mw_get_addr(struct ntb_dev *ntb, int widx,
phys_addr_t *base, resource_size_t *size)
{
return ntb->ops->peer_mw_get_addr(ntb, widx, base, size);
}
/**
* ntb_peer_mw_set_trans() - set a translation address of a memory window
* retrieved from a peer device
* @ntb: NTB device context.
* @pidx: Port index of peer device the translation address received from.
* @widx: Memory window index.
* @addr: The dma address of the shared memory to access.
* @size: The size of the shared memory to access.
*
* Set the translation of an outbound memory window. The local device may
* access shared memory allocated by a peer device sent the address.
*
* This method may not be implemented due to the hardware specific memory
* windows interface, so a translation address can be only set on the side,
* where shared memory (inbound memory windows) is allocated.
*
* Return: Zero on success, otherwise an error number.
*/
static inline int ntb_peer_mw_set_trans(struct ntb_dev *ntb, int pidx, int widx,
u64 addr, resource_size_t size)
{
if (!ntb->ops->peer_mw_set_trans)
return 0;
return ntb->ops->peer_mw_set_trans(ntb, pidx, widx, addr, size);
}
/**
* ntb_peer_mw_clear_trans() - clear the translation address of an outbound
* memory window
* @ntb: NTB device context.
* @pidx: Port index of peer device.
* @widx: Memory window index.
*
* Clear the translation of a outbound memory window. The local device may no
* longer access a shared memory through the window.
*
* This method may not be implemented due to the hardware specific memory
* windows interface.
*
* Return: Zero on success, otherwise an error number.
*/
static inline int ntb_peer_mw_clear_trans(struct ntb_dev *ntb, int pidx,
int widx)
{
if (!ntb->ops->peer_mw_clear_trans)
return ntb_peer_mw_set_trans(ntb, pidx, widx, 0, 0);
return ntb->ops->peer_mw_clear_trans(ntb, pidx, widx);
}
/**