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IB/core: Introduce new fast registration API

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The new fast registration  verb ib_map_mr_sg receives a scatterlist
and converts it to a page list under the verbs API thus hiding
the specific HW mapping details away from the consumer.

The provider drivers are provided with a generic helper ib_sg_to_pages
that converts a scatterlist into a vector of page addresses. The
drivers can still perform any HW specific page address setting
by passing a set_page function pointer which will be invoked for
each page address. This allows drivers to avoid keeping a shadow
page vectors and convert them to HW specific translations by doing
extra copies.

This API will allow ULPs to remove the duplicated code of constructing
a page vector from a given sg list.

The send work request ib_reg_wr also shrinks as it will contain only
mr, key and access flags in addition.

Signed-off-by: Sagi Grimberg <sagig@mellanox.com>
Tested-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Doug Ledford <dledford@redhat.com>
This commit is contained in:
Sagi Grimberg
2015-10-13 19:11:24 +03:00
committed by Doug Ledford
parent 63e8790d39
commit 4c67e2bfc8
2 changed files with 151 additions and 0 deletions
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44
include/rdma/ib_verbs.h
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@@ -738,6 +738,7 @@ enum ib_wc_opcode {
IB_WC_LSO,
IB_WC_LOCAL_INV,
IB_WC_FAST_REG_MR,
IB_WC_REG_MR,
IB_WC_MASKED_COMP_SWAP,
IB_WC_MASKED_FETCH_ADD,
/*
@@ -1025,6 +1026,7 @@ enum ib_wr_opcode {
IB_WR_RDMA_READ_WITH_INV,
IB_WR_LOCAL_INV,
IB_WR_FAST_REG_MR,
IB_WR_REG_MR,
IB_WR_MASKED_ATOMIC_CMP_AND_SWP,
IB_WR_MASKED_ATOMIC_FETCH_AND_ADD,
IB_WR_BIND_MW,
@@ -1157,6 +1159,18 @@ static inline struct ib_fast_reg_wr *fast_reg_wr(struct ib_send_wr *wr)
return container_of(wr, struct ib_fast_reg_wr, wr);
}
struct ib_reg_wr {
struct ib_send_wr wr;
struct ib_mr *mr;
u32 key;
int access;
};
static inline struct ib_reg_wr *reg_wr(struct ib_send_wr *wr)
{
return container_of(wr, struct ib_reg_wr, wr);
}
struct ib_bind_mw_wr {
struct ib_send_wr wr;
struct ib_mw *mw;
@@ -1369,6 +1383,9 @@ struct ib_mr {
struct ib_uobject *uobject;
u32 lkey;
u32 rkey;
u64 iova;
u32 length;
unsigned int page_size;
atomic_t usecnt; /* count number of MWs */
};
@@ -1753,6 +1770,9 @@ struct ib_device {
struct ib_mr * (*alloc_mr)(struct ib_pd *pd,
enum ib_mr_type mr_type,
u32 max_num_sg);
int (*map_mr_sg)(struct ib_mr *mr,
struct scatterlist *sg,
int sg_nents);
struct ib_fast_reg_page_list * (*alloc_fast_reg_page_list)(struct ib_device *device,
int page_list_len);
void (*free_fast_reg_page_list)(struct ib_fast_reg_page_list *page_list);
@@ -3059,4 +3079,28 @@ struct net_device *ib_get_net_dev_by_params(struct ib_device *dev, u8 port,
u16 pkey, const union ib_gid *gid,
const struct sockaddr *addr);
int ib_map_mr_sg(struct ib_mr *mr,
struct scatterlist *sg,
int sg_nents,
unsigned int page_size);
static inline int
ib_map_mr_sg_zbva(struct ib_mr *mr,
struct scatterlist *sg,
int sg_nents,
unsigned int page_size)
{
int n;
n = ib_map_mr_sg(mr, sg, sg_nents, page_size);
mr->iova = 0;
return n;
}
int ib_sg_to_pages(struct ib_mr *mr,
struct scatterlist *sgl,
int sg_nents,
int (*set_page)(struct ib_mr *, u64));
#endif /* IB_VERBS_H */