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RDMA/core: Add memory management extensions support

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This patch adds support for the IB "base memory management extension"
(BMME) and the equivalent iWARP operations (which the iWARP verbs
mandates all devices must implement).  The new operations are:

 - Allocate an ib_mr for use in fast register work requests.

 - Allocate/free a physical buffer lists for use in fast register work
   requests.  This allows device drivers to allocate this memory as
   needed for use in posting send requests (eg via dma_alloc_coherent).

 - New send queue work requests:
   * send with remote invalidate
   * fast register memory region
   * local invalidate memory region
   * RDMA read with invalidate local memory region (iWARP only)

Consumer interface details:

 - A new device capability flag IB_DEVICE_MEM_MGT_EXTENSIONS is added
   to indicate device support for these features.

 - New send work request opcodes IB_WR_FAST_REG_MR, IB_WR_LOCAL_INV,
   IB_WR_RDMA_READ_WITH_INV are added.

 - A new consumer API function, ib_alloc_mr() is added to allocate
   fast register memory regions.

 - New consumer API functions, ib_alloc_fast_reg_page_list() and
   ib_free_fast_reg_page_list() are added to allocate and free
   device-specific memory for fast registration page lists.

 - A new consumer API function, ib_update_fast_reg_key(), is added to
   allow the key portion of the R_Key and L_Key of a fast registration
   MR to be updated.  Consumers call this if desired before posting
   a IB_WR_FAST_REG_MR work request.

Consumers can use this as follows:

 - MR is allocated with ib_alloc_mr().

 - Page list memory is allocated with ib_alloc_fast_reg_page_list().

 - MR R_Key/L_Key "key" field is updated with ib_update_fast_reg_key().

 - MR made VALID and bound to a specific page list via
   ib_post_send(IB_WR_FAST_REG_MR)

 - MR made INVALID via ib_post_send(IB_WR_LOCAL_INV),
   ib_post_send(IB_WR_RDMA_READ_WITH_INV) or an incoming send with
   invalidate operation.

 - MR is deallocated with ib_dereg_mr()

 - page lists dealloced via ib_free_fast_reg_page_list().

Applications can allocate a fast register MR once, and then can
repeatedly bind the MR to different physical block lists (PBLs) via
posting work requests to a send queue (SQ).  For each outstanding
MR-to-PBL binding in the SQ pipe, a fast_reg_page_list needs to be
allocated (the fast_reg_page_list is owned by the low-level driver
from the consumer posting a work request until the request completes).
Thus pipelining can be achieved while still allowing device-specific
page_list processing.

The 32-bit fast register memory key/STag is composed of a 24-bit index
and an 8-bit key.  The application can change the key each time it
fast registers thus allowing more control over the peer's use of the
key/STag (ie it can effectively be changed each time the rkey is
rebound to a page list).

Signed-off-by: Steve Wise <swise@opengridcomputing.com>
Signed-off-by: Roland Dreier <rolandd@cisco.com>
This commit is contained in:
Steve Wise 2008-07-14 23:48:45 -07:00 committed by Roland Dreier
parent f89271da32
commit 00f7ec36c9
12 changed files with 154 additions and 26 deletions
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2
drivers/infiniband/core/uverbs_cmd.c
View file

@ -917,7 +917,7 @@ ssize_t ib_uverbs_poll_cq(struct ib_uverbs_file *file,
resp->wc[i].opcode = wc[i].opcode;
resp->wc[i].vendor_err = wc[i].vendor_err;
resp->wc[i].byte_len = wc[i].byte_len;
resp->wc[i].imm_data = (__u32 __force) wc[i].imm_data;
resp->wc[i].ex.imm_data = (__u32 __force) wc[i].ex.imm_data;
resp->wc[i].qp_num = wc[i].qp->qp_num;
resp->wc[i].src_qp = wc[i].src_qp;
resp->wc[i].wc_flags = wc[i].wc_flags;

46
drivers/infiniband/core/verbs.c
View file

@ -753,6 +753,52 @@ int ib_dereg_mr(struct ib_mr *mr)
}
EXPORT_SYMBOL(ib_dereg_mr);
struct ib_mr *ib_alloc_fast_reg_mr(struct ib_pd *pd, int max_page_list_len)
{
struct ib_mr *mr;
if (!pd->device->alloc_fast_reg_mr)
return ERR_PTR(-ENOSYS);
mr = pd->device->alloc_fast_reg_mr(pd, max_page_list_len);
if (!IS_ERR(mr)) {
mr->device = pd->device;
mr->pd = pd;
mr->uobject = NULL;
atomic_inc(&pd->usecnt);
atomic_set(&mr->usecnt, 0);
}
return mr;
}
EXPORT_SYMBOL(ib_alloc_fast_reg_mr);
struct ib_fast_reg_page_list *ib_alloc_fast_reg_page_list(struct ib_device *device,
int max_page_list_len)
{
struct ib_fast_reg_page_list *page_list;
if (!device->alloc_fast_reg_page_list)
return ERR_PTR(-ENOSYS);
page_list = device->alloc_fast_reg_page_list(device, max_page_list_len);
if (!IS_ERR(page_list)) {
page_list->device = device;
page_list->max_page_list_len = max_page_list_len;
}
return page_list;
}
EXPORT_SYMBOL(ib_alloc_fast_reg_page_list);
void ib_free_fast_reg_page_list(struct ib_fast_reg_page_list *page_list)
{
page_list->device->free_fast_reg_page_list(page_list);
}
EXPORT_SYMBOL(ib_free_fast_reg_page_list);
/* Memory windows */
struct ib_mw *ib_alloc_mw(struct ib_pd *pd)

2
drivers/infiniband/hw/ehca/ehca_reqs.c
View file

@ -681,7 +681,7 @@ static inline int ehca_poll_cq_one(struct ib_cq *cq, struct ib_wc *wc)
wc->dlid_path_bits = cqe->dlid;
wc->src_qp = cqe->remote_qp_number;
wc->wc_flags = cqe->w_completion_flags;
wc->imm_data = cpu_to_be32(cqe->immediate_data);
wc->ex.imm_data = cpu_to_be32(cqe->immediate_data);
wc->sl = cqe->service_level;
poll_cq_one_exit0:

2
drivers/infiniband/hw/ipath/ipath_cq.c
View file

@ -82,7 +82,7 @@ void ipath_cq_enter(struct ipath_cq *cq, struct ib_wc *entry, int solicited)
wc->uqueue[head].opcode = entry->opcode;
wc->uqueue[head].vendor_err = entry->vendor_err;
wc->uqueue[head].byte_len = entry->byte_len;
wc->uqueue[head].imm_data = (__u32 __force)entry->imm_data;
wc->uqueue[head].ex.imm_data = (__u32 __force) entry->ex.imm_data;
wc->uqueue[head].qp_num = entry->qp->qp_num;
wc->uqueue[head].src_qp = entry->src_qp;
wc->uqueue[head].wc_flags = entry->wc_flags;

4
drivers/infiniband/hw/ipath/ipath_rc.c
View file

@ -1703,11 +1703,11 @@ void ipath_rc_rcv(struct ipath_ibdev *dev, struct ipath_ib_header *hdr,
case OP(SEND_LAST_WITH_IMMEDIATE):
send_last_imm:
if (header_in_data) {
wc.imm_data = *(__be32 *) data;
wc.ex.imm_data = *(__be32 *) data;
data += sizeof(__be32);
} else {
/* Immediate data comes after BTH */
wc.imm_data = ohdr->u.imm_data;
wc.ex.imm_data = ohdr->u.imm_data;
}
hdrsize += 4;
wc.wc_flags = IB_WC_WITH_IMM;

4
drivers/infiniband/hw/ipath/ipath_ruc.c
View file

@ -331,7 +331,7 @@ static void ipath_ruc_loopback(struct ipath_qp *sqp)
switch (wqe->wr.opcode) {
case IB_WR_SEND_WITH_IMM:
wc.wc_flags = IB_WC_WITH_IMM;
wc.imm_data = wqe->wr.ex.imm_data;
wc.ex.imm_data = wqe->wr.ex.imm_data;
/* FALLTHROUGH */
case IB_WR_SEND:
if (!ipath_get_rwqe(qp, 0))
@ -342,7 +342,7 @@ static void ipath_ruc_loopback(struct ipath_qp *sqp)
if (unlikely(!(qp->qp_access_flags & IB_ACCESS_REMOTE_WRITE)))
goto inv_err;
wc.wc_flags = IB_WC_WITH_IMM;
wc.imm_data = wqe->wr.ex.imm_data;
wc.ex.imm_data = wqe->wr.ex.imm_data;
if (!ipath_get_rwqe(qp, 1))
goto rnr_nak;
/* FALLTHROUGH */

8
drivers/infiniband/hw/ipath/ipath_uc.c
View file

@ -379,11 +379,11 @@ void ipath_uc_rcv(struct ipath_ibdev *dev, struct ipath_ib_header *hdr,
case OP(SEND_LAST_WITH_IMMEDIATE):
send_last_imm:
if (header_in_data) {
wc.imm_data = *(__be32 *) data;
wc.ex.imm_data = *(__be32 *) data;
data += sizeof(__be32);
} else {
/* Immediate data comes after BTH */
wc.imm_data = ohdr->u.imm_data;
wc.ex.imm_data = ohdr->u.imm_data;
}
hdrsize += 4;
wc.wc_flags = IB_WC_WITH_IMM;
@ -483,11 +483,11 @@ void ipath_uc_rcv(struct ipath_ibdev *dev, struct ipath_ib_header *hdr,
case OP(RDMA_WRITE_LAST_WITH_IMMEDIATE):
rdma_last_imm:
if (header_in_data) {
wc.imm_data = *(__be32 *) data;
wc.ex.imm_data = *(__be32 *) data;
data += sizeof(__be32);
} else {
/* Immediate data comes after BTH */
wc.imm_data = ohdr->u.imm_data;
wc.ex.imm_data = ohdr->u.imm_data;
}
hdrsize += 4;
wc.wc_flags = IB_WC_WITH_IMM;

8
drivers/infiniband/hw/ipath/ipath_ud.c
View file

@ -96,7 +96,7 @@ static void ipath_ud_loopback(struct ipath_qp *sqp, struct ipath_swqe *swqe)
if (swqe->wr.opcode == IB_WR_SEND_WITH_IMM) {
wc.wc_flags = IB_WC_WITH_IMM;
wc.imm_data = swqe->wr.ex.imm_data;
wc.ex.imm_data = swqe->wr.ex.imm_data;
}
/*
@ -492,14 +492,14 @@ void ipath_ud_rcv(struct ipath_ibdev *dev, struct ipath_ib_header *hdr,
if (qp->ibqp.qp_num > 1 &&
opcode == IB_OPCODE_UD_SEND_ONLY_WITH_IMMEDIATE) {
if (header_in_data) {
wc.imm_data = *(__be32 *) data;
wc.ex.imm_data = *(__be32 *) data;
data += sizeof(__be32);
} else
wc.imm_data = ohdr->u.ud.imm_data;
wc.ex.imm_data = ohdr->u.ud.imm_data;
wc.wc_flags = IB_WC_WITH_IMM;
hdrsize += sizeof(u32);
} else if (opcode == IB_OPCODE_UD_SEND_ONLY) {
wc.imm_data = 0;
wc.ex.imm_data = 0;
wc.wc_flags = 0;
} else {
dev->n_pkt_drops++;

12
drivers/infiniband/hw/mlx4/cq.c
View file

@ -663,18 +663,18 @@ static int mlx4_ib_poll_one(struct mlx4_ib_cq *cq,
switch (cqe->owner_sr_opcode & MLX4_CQE_OPCODE_MASK) {
case MLX4_RECV_OPCODE_RDMA_WRITE_IMM:
wc->opcode = IB_WC_RECV_RDMA_WITH_IMM;
wc->wc_flags = IB_WC_WITH_IMM;
wc->imm_data = cqe->immed_rss_invalid;
wc->opcode = IB_WC_RECV_RDMA_WITH_IMM;
wc->wc_flags = IB_WC_WITH_IMM;
wc->ex.imm_data = cqe->immed_rss_invalid;
break;
case MLX4_RECV_OPCODE_SEND:
wc->opcode = IB_WC_RECV;
wc->wc_flags = 0;
break;
case MLX4_RECV_OPCODE_SEND_IMM:
wc->opcode = IB_WC_RECV;
wc->wc_flags = IB_WC_WITH_IMM;
wc->imm_data = cqe->immed_rss_invalid;
wc->opcode = IB_WC_RECV;
wc->wc_flags = IB_WC_WITH_IMM;
wc->ex.imm_data = cqe->immed_rss_invalid;
break;
}

4
drivers/infiniband/hw/mthca/mthca_cq.c
View file

@ -620,13 +620,13 @@ static inline int mthca_poll_one(struct mthca_dev *dev,
case IB_OPCODE_SEND_LAST_WITH_IMMEDIATE:
case IB_OPCODE_SEND_ONLY_WITH_IMMEDIATE:
entry->wc_flags = IB_WC_WITH_IMM;
entry->imm_data = cqe->imm_etype_pkey_eec;
entry->ex.imm_data = cqe->imm_etype_pkey_eec;
entry->opcode = IB_WC_RECV;
break;
case IB_OPCODE_RDMA_WRITE_LAST_WITH_IMMEDIATE:
case IB_OPCODE_RDMA_WRITE_ONLY_WITH_IMMEDIATE:
entry->wc_flags = IB_WC_WITH_IMM;
entry->imm_data = cqe->imm_etype_pkey_eec;
entry->ex.imm_data = cqe->imm_etype_pkey_eec;
entry->opcode = IB_WC_RECV_RDMA_WITH_IMM;
break;
default:

5
include/rdma/ib_user_verbs.h
View file

@ -289,7 +289,10 @@ struct ib_uverbs_wc {
__u32 opcode;
__u32 vendor_err;
__u32 byte_len;
__u32 imm_data;
union {
__u32 imm_data;
__u32 invalidate_rkey;
} ex;
__u32 qp_num;
__u32 src_qp;
__u32 wc_flags;

83
include/rdma/ib_verbs.h
View file

@ -103,6 +103,7 @@ enum ib_device_cap_flags {
*/
IB_DEVICE_UD_IP_CSUM = (1<<18),
IB_DEVICE_UD_TSO = (1<<19),
IB_DEVICE_MEM_MGT_EXTENSIONS = (1<<21),
};
enum ib_atomic_cap {
@ -148,6 +149,7 @@ struct ib_device_attr {
int max_srq;
int max_srq_wr;
int max_srq_sge;
unsigned int max_fast_reg_page_list_len;
u16 max_pkeys;
u8 local_ca_ack_delay;
};
@ -411,6 +413,8 @@ enum ib_wc_opcode {
IB_WC_FETCH_ADD,
IB_WC_BIND_MW,
IB_WC_LSO,
IB_WC_LOCAL_INV,
IB_WC_FAST_REG_MR,
/*
* Set value of IB_WC_RECV so consumers can test if a completion is a
* receive by testing (opcode & IB_WC_RECV).
@ -421,7 +425,8 @@ enum ib_wc_opcode {
enum ib_wc_flags {
IB_WC_GRH = 1,
IB_WC_WITH_IMM = (1<<1)
IB_WC_WITH_IMM = (1<<1),
IB_WC_WITH_INVALIDATE = (1<<2),
};
struct ib_wc {
@ -431,7 +436,10 @@ struct ib_wc {
u32 vendor_err;
u32 byte_len;
struct ib_qp *qp;
__be32 imm_data;
union {
__be32 imm_data;
u32 invalidate_rkey;
} ex;
u32 src_qp;
int wc_flags;
u16 pkey_index;
@ -625,6 +633,9 @@ enum ib_wr_opcode {
IB_WR_ATOMIC_FETCH_AND_ADD,
IB_WR_LSO,
IB_WR_SEND_WITH_INV,
IB_WR_RDMA_READ_WITH_INV,
IB_WR_LOCAL_INV,
IB_WR_FAST_REG_MR,
};
enum ib_send_flags {
@ -641,6 +652,12 @@ struct ib_sge {
u32 lkey;
};
struct ib_fast_reg_page_list {
struct ib_device *device;
u64 *page_list;
unsigned int max_page_list_len;
};
struct ib_send_wr {
struct ib_send_wr *next;
u64 wr_id;
@ -673,6 +690,15 @@ struct ib_send_wr {
u16 pkey_index; /* valid for GSI only */
u8 port_num; /* valid for DR SMPs on switch only */
} ud;
struct {
u64 iova_start;
struct ib_fast_reg_page_list *page_list;
unsigned int page_shift;
unsigned int page_list_len;
u32 length;
int access_flags;
u32 rkey;
} fast_reg;
} wr;
};
@ -1011,6 +1037,11 @@ struct ib_device {
int (*query_mr)(struct ib_mr *mr,
struct ib_mr_attr *mr_attr);
int (*dereg_mr)(struct ib_mr *mr);
struct ib_mr * (*alloc_fast_reg_mr)(struct ib_pd *pd,
int max_page_list_len);
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);
int (*rereg_phys_mr)(struct ib_mr *mr,
int mr_rereg_mask,
struct ib_pd *pd,
@ -1804,6 +1835,54 @@ int ib_query_mr(struct ib_mr *mr, struct ib_mr_attr *mr_attr);
*/
int ib_dereg_mr(struct ib_mr *mr);
/**
* ib_alloc_fast_reg_mr - Allocates memory region usable with the
* IB_WR_FAST_REG_MR send work request.
* @pd: The protection domain associated with the region.
* @max_page_list_len: requested max physical buffer list length to be
* used with fast register work requests for this MR.
*/
struct ib_mr *ib_alloc_fast_reg_mr(struct ib_pd *pd, int max_page_list_len);
/**
* ib_alloc_fast_reg_page_list - Allocates a page list array
* @device - ib device pointer.
* @page_list_len - size of the page list array to be allocated.
*
* This allocates and returns a struct ib_fast_reg_page_list * and a
* page_list array that is at least page_list_len in size. The actual
* size is returned in max_page_list_len. The caller is responsible
* for initializing the contents of the page_list array before posting
* a send work request with the IB_WC_FAST_REG_MR opcode.
*
* The page_list array entries must be translated using one of the
* ib_dma_*() functions just like the addresses passed to
* ib_map_phys_fmr(). Once the ib_post_send() is issued, the struct
* ib_fast_reg_page_list must not be modified by the caller until the
* IB_WC_FAST_REG_MR work request completes.
*/
struct ib_fast_reg_page_list *ib_alloc_fast_reg_page_list(
struct ib_device *device, int page_list_len);
/**
* ib_free_fast_reg_page_list - Deallocates a previously allocated
* page list array.
* @page_list - struct ib_fast_reg_page_list pointer to be deallocated.
*/
void ib_free_fast_reg_page_list(struct ib_fast_reg_page_list *page_list);
/**
* ib_update_fast_reg_key - updates the key portion of the fast_reg MR
* R_Key and L_Key.
* @mr - struct ib_mr pointer to be updated.
* @newkey - new key to be used.
*/
static inline void ib_update_fast_reg_key(struct ib_mr *mr, u8 newkey)
{
mr->lkey = (mr->lkey & 0xffffff00) | newkey;
mr->rkey = (mr->rkey & 0xffffff00) | newkey;
}
/**
* ib_alloc_mw - Allocates a memory window.
* @pd: The protection domain associated with the memory window.