Re: [PATCH rdma-core v3 2/6] verbs: Support dma-buf based memory region

On 11/27/2020 10:55 PM, Jianxin Xiong wrote:

Add new API function and new provider method for registering dma-buf based memory region. Update the man page and bump the API version.

Signed-off-by: Jianxin Xiong jianxin.xiong@intel.com

debian/libibverbs1.symbols | 2 ++ libibverbs/CMakeLists.txt | 2 +- libibverbs/cmd_mr.c | 38 ++++++++++++++++++++++++++++++++++++++ libibverbs/driver.h | 7 +++++++ libibverbs/dummy_ops.c | 11 +++++++++++ libibverbs/libibverbs.map.in | 6 ++++++ libibverbs/man/ibv_reg_mr.3 | 27 +++++++++++++++++++++++++-- libibverbs/verbs.c | 18 ++++++++++++++++++ libibverbs/verbs.h | 11 +++++++++++ 9 files changed, 119 insertions(+), 3 deletions(-)

This version still didn't handle the fork() note that was given on previous one.

Was that missed ?

diff --git a/debian/libibverbs1.symbols b/debian/libibverbs1.symbols index 9130f41..fcf4d87 100644 --- a/debian/libibverbs1.symbols +++ b/debian/libibverbs1.symbols @@ -9,6 +9,7 @@ libibverbs.so.1 libibverbs1 #MINVER# IBVERBS_1.9@IBVERBS_1.9 30 IBVERBS_1.10@IBVERBS_1.10 31 IBVERBS_1.11@IBVERBS_1.11 32

• IBVERBS_1.12@IBVERBS_1.12 33 (symver)IBVERBS_PRIVATE_33 33 _ibv_query_gid_ex@IBVERBS_1.11 32 _ibv_query_gid_table@IBVERBS_1.11 32

@@ -99,6 +100,7 @@ libibverbs.so.1 libibverbs1 #MINVER# ibv_rate_to_mbps@IBVERBS_1.1 1.1.8 ibv_rate_to_mult@IBVERBS_1.0 1.1.6 ibv_read_sysfs_file@IBVERBS_1.0 1.1.6

• ibv_reg_dmabuf_mr@IBVERBS_1.12 33 ibv_reg_mr@IBVERBS_1.0 1.1.6 ibv_reg_mr@IBVERBS_1.1 1.1.6 ibv_reg_mr_iova@IBVERBS_1.7 25

diff --git a/libibverbs/CMakeLists.txt b/libibverbs/CMakeLists.txt index 0fe4256..d075225 100644 --- a/libibverbs/CMakeLists.txt +++ b/libibverbs/CMakeLists.txt @@ -21,7 +21,7 @@ configure_file("libibverbs.map.in"

rdma_library(ibverbs "${CMAKE_CURRENT_BINARY_DIR}/libibverbs.map" # See Documentation/versioning.md

• 1 1.11.${PACKAGE_VERSION}

• 1 1.12.${PACKAGE_VERSION} all_providers.c cmd.c cmd_ah.c

diff --git a/libibverbs/cmd_mr.c b/libibverbs/cmd_mr.c index 42dbe42..95ed2d1 100644 --- a/libibverbs/cmd_mr.c +++ b/libibverbs/cmd_mr.c @@ -1,5 +1,6 @@ /*

• Copyright (c) 2018 Mellanox Technologies, Ltd. All rights reserved.

• • Copyright (c) 2020 Intel Corporation. All rights reserved.
  • This software is available to you under a choice of one of two
  • licenses. You may choose to be licensed under the terms of the GNU

@@ -116,3 +117,40 @@ int ibv_cmd_query_mr(struct ibv_pd *pd, struct verbs_mr *vmr, return 0; }

+int ibv_cmd_reg_dmabuf_mr(struct ibv_pd *pd, uint64_t offset, size_t length,

• 	  uint64_t iova, int fd, int access,
  

• 	  struct verbs_mr *vmr)
  

+{

• DECLARE_COMMAND_BUFFER(cmdb, UVERBS_OBJECT_MR,

• 	       UVERBS_METHOD_REG_DMABUF_MR,
  

• 	       9);
  

• struct ib_uverbs_attr *handle;
• uint32_t lkey, rkey;
• int ret;
• handle = fill_attr_out_obj(cmdb, UVERBS_ATTR_REG_DMABUF_MR_HANDLE);
• fill_attr_out_ptr(cmdb, UVERBS_ATTR_REG_DMABUF_MR_RESP_LKEY, &lkey);
• fill_attr_out_ptr(cmdb, UVERBS_ATTR_REG_DMABUF_MR_RESP_RKEY, &rkey);
• fill_attr_in_obj(cmdb, UVERBS_ATTR_REG_DMABUF_MR_PD_HANDLE, pd->handle);
• fill_attr_in_uint64(cmdb, UVERBS_ATTR_REG_DMABUF_MR_OFFSET, offset);
• fill_attr_in_uint64(cmdb, UVERBS_ATTR_REG_DMABUF_MR_LENGTH, length);
• fill_attr_in_uint64(cmdb, UVERBS_ATTR_REG_DMABUF_MR_IOVA, iova);
• fill_attr_in_uint32(cmdb, UVERBS_ATTR_REG_DMABUF_MR_FD, fd);
• fill_attr_in_uint32(cmdb, UVERBS_ATTR_REG_DMABUF_MR_ACCESS_FLAGS, access);
• ret = execute_ioctl(pd->context, cmdb);
• if (ret)

• return errno;
  

• vmr->ibv_mr.handle = read_attr_obj(UVERBS_ATTR_REG_DMABUF_MR_HANDLE,

• 			   handle);
  

• vmr->ibv_mr.context = pd->context;
• vmr->ibv_mr.lkey = lkey;
• vmr->ibv_mr.rkey = rkey;
• vmr->ibv_mr.pd = pd;
• vmr->ibv_mr.addr = (void *)offset;
• vmr->ibv_mr.length = length;
• vmr->mr_type = IBV_MR_TYPE_MR;
• return 0;

+} diff --git a/libibverbs/driver.h b/libibverbs/driver.h index ab80f4b..d6a9d0a 100644 --- a/libibverbs/driver.h +++ b/libibverbs/driver.h @@ -2,6 +2,7 @@

• Copyright (c) 2004, 2005 Topspin Communications. All rights reserved.
• Copyright (c) 2005, 2006 Cisco Systems, Inc. All rights reserved.
• Copyright (c) 2005 PathScale, Inc. All rights reserved.

• • Copyright (c) 2020 Intel Corporation. All rights reserved.
  • This software is available to you under a choice of one of two
  • licenses. You may choose to be licensed under the terms of the GNU

@@ -373,6 +374,9 @@ struct verbs_context_ops { struct ibv_mr *(*reg_dm_mr)(struct ibv_pd *pd, struct ibv_dm *dm, uint64_t dm_offset, size_t length, unsigned int access);

• struct ibv_mr *(*reg_dmabuf_mr)(struct ibv_pd *pd, uint64_t offset,

• 			size_t length, uint64_t iova,
  

• 			int fd, int access);
  

  struct ibv_mr *(*reg_mr)(struct ibv_pd *pd, void *addr, size_t length, uint64_t hca_va, int access); int (*req_notify_cq)(struct ibv_cq *cq, int solicited_only);

@@ -498,6 +502,9 @@ int ibv_cmd_advise_mr(struct ibv_pd *pd, uint32_t flags, struct ibv_sge *sg_list, uint32_t num_sge); +int ibv_cmd_reg_dmabuf_mr(struct ibv_pd *pd, uint64_t offset, size_t length,

• 	  uint64_t iova, int fd, int access,
  

• 	  struct verbs_mr *vmr);
  

  int ibv_cmd_alloc_mw(struct ibv_pd *pd, enum ibv_mw_type type, struct ibv_mw *mw, struct ibv_alloc_mw *cmd, size_t cmd_size,

diff --git a/libibverbs/dummy_ops.c b/libibverbs/dummy_ops.c index e5af9e4..64ef279 100644 --- a/libibverbs/dummy_ops.c +++ b/libibverbs/dummy_ops.c @@ -1,5 +1,6 @@ /*

• Copyright (c) 2017 Mellanox Technologies, Inc. All rights reserved.

• • Copyright (c) 2020 Intel Corporation. All rights reserved.
  • This software is available to you under a choice of one of two
  • licenses. You may choose to be licensed under the terms of the GNU

@@ -452,6 +453,14 @@ static struct ibv_mr *reg_mr(struct ibv_pd *pd, void *addr, size_t length, return NULL; }

+static struct ibv_mr *reg_dmabuf_mr(struct ibv_pd *pd, uint64_t offset,

• 		    size_t length, uint64_t iova,
  

• 		    int fd, int access)
  

+{

• errno = EOPNOTSUPP;
• return NULL;

+}

• static int req_notify_cq(struct ibv_cq *cq, int solicited_only) { return EOPNOTSUPP;

@@ -560,6 +569,7 @@ const struct verbs_context_ops verbs_dummy_ops = { query_srq, read_counters, reg_dm_mr,

• reg_dmabuf_mr, reg_mr, req_notify_cq, rereg_mr,

@@ -689,6 +699,7 @@ void verbs_set_ops(struct verbs_context *vctx, SET_PRIV_OP_IC(vctx, set_ece); SET_PRIV_OP_IC(vctx, unimport_mr); SET_PRIV_OP_IC(vctx, unimport_pd);

• SET_OP(ctx, reg_dmabuf_mr);

  #undef SET_OP #undef SET_OP2

diff --git a/libibverbs/libibverbs.map.in b/libibverbs/libibverbs.map.in index b5ccaca..f67e1ef 100644 --- a/libibverbs/libibverbs.map.in +++ b/libibverbs/libibverbs.map.in @@ -148,6 +148,11 @@ IBVERBS_1.11 { _ibv_query_gid_table; } IBVERBS_1.10;

+IBVERBS_1.12 {

• global:

• ibv_reg_dmabuf_mr;
  

+} IBVERBS_1.11;

• /* If any symbols in this stanza change ABI then the entire staza gets a new symbol version. See the top level CMakeLists.txt for this setting. */

@@ -211,6 +216,7 @@ IBVERBS_PRIVATE_@IBVERBS_PABI_VERSION@ { ibv_cmd_query_srq; ibv_cmd_read_counters; ibv_cmd_reg_dm_mr;

• ibv_cmd_reg_dmabuf_mr;
  

  ibv_cmd_reg_mr; ibv_cmd_req_notify_cq; ibv_cmd_rereg_mr;

diff --git a/libibverbs/man/ibv_reg_mr.3 b/libibverbs/man/ibv_reg_mr.3 index 2bfc955..a522527 100644 --- a/libibverbs/man/ibv_reg_mr.3 +++ b/libibverbs/man/ibv_reg_mr.3 @@ -3,7 +3,7 @@ ." .TH IBV_REG_MR 3 2006-10-31 libibverbs "Libibverbs Programmer's Manual" .SH "NAME" -ibv_reg_mr, ibv_reg_mr_iova, ibv_dereg_mr - register or deregister a memory region (MR) +ibv_reg_mr, ibv_reg_mr_iova, ibv_reg_dmabuf_mr, ibv_dereg_mr - register or deregister a memory region (MR) .SH "SYNOPSIS" .nf .B #include <infiniband/verbs.h> @@ -15,6 +15,10 @@ ibv_reg_mr, ibv_reg_mr_iova, ibv_dereg_mr - register or deregister a memory reg .BI " size_t " "length" ", uint64_t " "hca_va" , .BI " int " "access" ); .sp +.BI "struct ibv_mr *ibv_reg_dmabuf_mr(struct ibv_pd " "*pd" ", uint64_t " "offset" , +.BI " size_t " "length" ", uint64_t " "iova" , +.BI " int " "fd" ", int " "access" ); +.sp .BI "int ibv_dereg_mr(struct ibv_mr " "*mr" ); .fi .SH "DESCRIPTION" @@ -71,11 +75,30 @@ a lkey or rkey. The offset in the memory region is computed as 'addr + (iova - hca_va)'. Specifying 0 for hca_va has the same effect as IBV_ACCESS_ZERO_BASED. .PP +.B ibv_reg_dmabuf_mr() +registers a dma-buf based memory region (MR) associated with the protection domain +.I pd\fR. +The MR starts at +.I offset +of the dma-buf and its size is +.I length\fR. +The dma-buf is identified by the file descriptor +.I fd\fR. +The argument +.I iova +specifies the virtual base address of the MR when accessed through a lkey or rkey. +It must have the same page offset as +.I offset\fR. +The argument +.I access +describes the desired memory protection attributes; it is similar to the ibv_reg_mr case except that only the following flags are supported: +.B IBV_ACCESS_LOCAL_WRITE, IBV_ACCESS_REMOTE_WRITE, IBV_ACCESS_REMOTE_READ, IBV_ACCESS_REMOTE_ATOMIC, IBV_ACCESS_RELAXED_ORDERING. +.PP .B ibv_dereg_mr() deregisters the MR .I mr\fR. .SH "RETURN VALUE" -.B ibv_reg_mr() / ibv_reg_mr_iova() +.B ibv_reg_mr() / ibv_reg_mr_iova() / ibv_reg_dmabuf_mr() returns a pointer to the registered MR, or NULL if the request fails. The local key (\fBL_Key\fR) field .B lkey diff --git a/libibverbs/verbs.c b/libibverbs/verbs.c index 2b0ede8..6293462 100644 --- a/libibverbs/verbs.c +++ b/libibverbs/verbs.c @@ -1,6 +1,7 @@ /*

• Copyright (c) 2005 Topspin Communications. All rights reserved.
• Copyright (c) 2006, 2007 Cisco Systems, Inc. All rights reserved.

• • Copyright (c) 2020 Intel Corperation. All rights reserved.
  • This software is available to you under a choice of one of two
  • licenses. You may choose to be licensed under the terms of the GNU

@@ -367,6 +368,23 @@ void ibv_unimport_mr(struct ibv_mr *mr) get_ops(mr->context)->unimport_mr(mr); }

+struct ibv_mr *ibv_reg_dmabuf_mr(struct ibv_pd *pd, uint64_t offset,

• 		 size_t length, uint64_t iova, int fd,
  

• 		 int access)
  

+{

• struct ibv_mr *mr;
• mr = get_ops(pd->context)->reg_dmabuf_mr(pd, offset, length, iova,

• 				 fd, access);
  

• if (mr) {

• mr->context = pd->context;
  

• mr->pd      = pd;
  

• mr->addr    = (void *)offset;
  

• mr->length  = length;
  

• }
• return mr;

+}

• LATEST_SYMVER_FUNC(ibv_rereg_mr, 1_1, "IBVERBS_1.1", int, struct ibv_mr *mr, int flags,

diff --git a/libibverbs/verbs.h b/libibverbs/verbs.h index ee57e05..1a0af0e 100644 --- a/libibverbs/verbs.h +++ b/libibverbs/verbs.h @@ -3,6 +3,7 @@

• Copyright (c) 2004, 2011-2012 Intel Corporation. All rights reserved.
• Copyright (c) 2005, 2006, 2007 Cisco Systems, Inc. All rights reserved.
• Copyright (c) 2005 PathScale, Inc. All rights reserved.

• • Copyright (c) 2020 Intel Corporation. All rights reserved.
  • This software is available to you under a choice of one of two
  • licenses. You may choose to be licensed under the terms of the GNU

@@ -1961,6 +1962,10 @@ struct ibv_context_ops { void *(*_compat_attach_mcast)(void); void *(*_compat_detach_mcast)(void); void *(*_compat_async_event)(void);

• struct ibv_mr * (*reg_dmabuf_mr)(struct ibv_pd *pd,

• 				 uint64_t offset, size_t length,
  

• 				 uint64_t iova, int fd,
  

• 				 int access);
  

  };

  struct ibv_context {

@@ -2535,6 +2540,12 @@ __ibv_reg_mr_iova(struct ibv_pd *pd, void *addr, size_t length, uint64_t iova, __builtin_constant_p( \ ((access) & IBV_ACCESS_OPTIONAL_RANGE) == 0))

+/**

• • ibv_reg_dmabuf_mr - Register a dambuf-based memory region
• */

+struct ibv_mr *ibv_reg_dmabuf_mr(struct ibv_pd *pd, uint64_t offset, size_t length,

• 		 uint64_t iova, int fd, int access);
  

• enum ibv_rereg_mr_err_code { /* Old MR is valid, invalid input */ IBV_REREG_MR_ERR_INPUT = -1,