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X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 20 Jul 2021 08:18:15.6901 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 6480b7b0-f1b5-46cf-071e-08d94b56eca6 X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a;Ip=[216.228.112.32];Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: BN8NAM11FT068.eop-nam11.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: MN2PR12MB3184 Precedence: bulk List-ID: X-Mailing-List: linux-rdma@vger.kernel.org From: Edward Srouji A DevX object represents some underlay firmware object, the input command to create it is some raw data given by the user application which should match the device specification. A new class Mlx5DevxObj was added that would present any DevX object that could be creating using the create_obj DevX API. The command's output is stored in the object's instance, and the object can be modified/queried and destroyed. Reviewed-by: Ido Kalir Signed-off-by: Edward Srouji --- Documentation/pyverbs.md | 34 ++++++++++++ pyverbs/providers/mlx5/libmlx5.pxd | 7 +++ pyverbs/providers/mlx5/mlx5dv.pxd | 6 +++ pyverbs/providers/mlx5/mlx5dv.pyx | 103 ++++++++++++++++++++++++++++++++++++- 4 files changed, 149 insertions(+), 1 deletion(-) diff --git a/Documentation/pyverbs.md b/Documentation/pyverbs.md index c7fa761..bcbde05 100644 --- a/Documentation/pyverbs.md +++ b/Documentation/pyverbs.md @@ -745,3 +745,37 @@ Below is the output when printing the spec. Dst mac : de:de:de:00:de:de mask: ff:ff:ff:ff:ff:ff Ether type : 8451 mask: 65535 Vlan tag : 8961 mask: 65535 + + +##### MLX5 DevX Objects +A DevX object represents some underlay firmware object, the input command to +create it is some raw data given by the user application which should match the +device specification. +Upon successful creation, the output buffer includes the raw data from the device +according to its specification and is stored in the Mlx5DevxObj instance. This +data can be used as part of related firmware commands to this object. +In addition to creation, the user can query/modify and destroy the object. + +Although weakrefs and DevX objects closure are added and handled by +Pyverbs, the users must manually close these objects when finished, and +should not let them be handled by the GC, or by closing the Mlx5Context directly, +since there's no guarantee that the DevX objects are closed in the correct order, +because Mlx5DevxObj is a general class that can be any of the device's available +objects. +But Pyverbs does guarantee to close DevX UARs and UMEMs in order, and after +closing the other DevX objects. + +The following code snippet shows how to allocate and destroy a PD object over DevX. +```python +from pyverbs.providers.mlx5.mlx5dv import Mlx5Context, Mlx5DVContextAttr, Mlx5DevxObj +import pyverbs.providers.mlx5.mlx5_enums as dve +import struct + +attr = Mlx5DVContextAttr(dve.MLX5DV_CONTEXT_FLAGS_DEVX) +ctx = Mlx5Context(attr, 'rocep8s0f0') +MLX5_CMD_OP_ALLOC_PD = 0x800 +MLX5_CMD_OP_ALLOC_PD_OUTLEN = 0x10 +cmd_in = struct.pack('!H14s', MLX5_CMD_OP_ALLOC_PD, bytes(0)) +pd = Mlx5DevxObj(ctx, cmd_in, MLX5_CMD_OP_ALLOC_PD_OUTLEN) +pd.close() +``` diff --git a/pyverbs/providers/mlx5/libmlx5.pxd b/pyverbs/providers/mlx5/libmlx5.pxd index ba2c6ec..34691a9 100644 --- a/pyverbs/providers/mlx5/libmlx5.pxd +++ b/pyverbs/providers/mlx5/libmlx5.pxd @@ -319,6 +319,13 @@ cdef extern from 'infiniband/mlx5dv.h': mlx5dv_devx_umem_in *umem_in) int mlx5dv_devx_umem_dereg(mlx5dv_devx_umem *umem) int mlx5dv_devx_query_eqn(v.ibv_context *context, uint32_t vector, uint32_t *eqn) + mlx5dv_devx_obj *mlx5dv_devx_obj_create(v.ibv_context *context, const void *_in, + size_t inlen, void *out, size_t outlen) + int mlx5dv_devx_obj_query(mlx5dv_devx_obj *obj, const void *in_, + size_t inlen, void *out, size_t outlen) + int mlx5dv_devx_obj_modify(mlx5dv_devx_obj *obj, const void *in_, + size_t inlen, void *out, size_t outlen) + int mlx5dv_devx_obj_destroy(mlx5dv_devx_obj *obj) # Mkey setters void mlx5dv_wr_mkey_configure(mlx5dv_qp_ex *mqp, mlx5dv_mkey *mkey, diff --git a/pyverbs/providers/mlx5/mlx5dv.pxd b/pyverbs/providers/mlx5/mlx5dv.pxd index 154a117..2b758fe 100644 --- a/pyverbs/providers/mlx5/mlx5dv.pxd +++ b/pyverbs/providers/mlx5/mlx5dv.pxd @@ -12,6 +12,7 @@ from pyverbs.cq cimport CQEX cdef class Mlx5Context(Context): cdef object devx_umems + cdef object devx_objs cdef add_ref(self, obj) cpdef close(self) @@ -77,3 +78,8 @@ cdef class Mlx5UMEM(PyverbsCM): cdef Context context cdef void *addr cdef object is_user_addr + +cdef class Mlx5DevxObj(PyverbsCM): + cdef dv.mlx5dv_devx_obj *obj + cdef Context context + cdef object out_view diff --git a/pyverbs/providers/mlx5/mlx5dv.pyx b/pyverbs/providers/mlx5/mlx5dv.pyx index 2c47cb6..ab0bd4a 100644 --- a/pyverbs/providers/mlx5/mlx5dv.pyx +++ b/pyverbs/providers/mlx5/mlx5dv.pyx @@ -140,6 +140,104 @@ cdef class Mlx5DVContextAttr(PyverbsObject): self.attr.comp_mask = val +cdef class Mlx5DevxObj(PyverbsCM): + """ + Represents mlx5dv_devx_obj C struct. + """ + def __init__(self, Context context, in_, outlen): + """ + Creates a DevX object. + If the object was successfully created, the command's output would be + stored as a memoryview in self.out_view. + :param in_: Bytes of the obj_create command's input data provided in a + device specification format. + (Stream of bytes or __bytes__ is implemented) + :param outlen: Expected output length in bytes + """ + super().__init__() + in_bytes = bytes(in_) + cdef char *in_mailbox = _prepare_devx_inbox(in_bytes) + cdef char *out_mailbox = _prepare_devx_outbox(outlen) + self.obj = dv.mlx5dv_devx_obj_create(context.context, in_mailbox, + len(in_bytes), out_mailbox, outlen) + try: + if self.obj == NULL: + raise PyverbsRDMAErrno('Failed to create DevX object') + self.out_view = memoryview(out_mailbox[:outlen]) + status = hex(self.out_view[0]) + syndrome = self.out_view[4:8].hex() + if status != hex(0): + raise PyverbsRDMAError('Failed to create DevX object with status' + f'({status}) and syndrome (0x{syndrome})') + finally: + free(in_mailbox) + free(out_mailbox) + self.context = context + self.context.add_ref(self) + + def query(self, in_, outlen): + """ + Queries the DevX object. + :param in_: Bytes of the obj_query command's input data provided in a + device specification format. + (Stream of bytes or __bytes__ is implemented) + :param outlen: Expected output length in bytes + :return: Bytes of the command's output + """ + in_bytes = bytes(in_) + cdef char *in_mailbox = _prepare_devx_inbox(in_bytes) + cdef char *out_mailbox = _prepare_devx_outbox(outlen) + rc = dv.mlx5dv_devx_obj_query(self.obj, in_mailbox, len(in_bytes), + out_mailbox, outlen) + try: + if rc: + raise PyverbsRDMAError('Failed to query DevX object', rc) + out = out_mailbox[:outlen] + finally: + free(in_mailbox) + free(out_mailbox) + return out + + def modify(self, in_, outlen): + """ + Modifies the DevX object. + :param in_: Bytes of the obj_modify command's input data provided in a + device specification format. + (Stream of bytes or __bytes__ is implemented) + :param outlen: Expected output length in bytes + :return: Bytes of the command's output + """ + in_bytes = bytes(in_) + cdef char *in_mailbox = _prepare_devx_inbox(in_bytes) + cdef char *out_mailbox = _prepare_devx_outbox(outlen) + rc = dv.mlx5dv_devx_obj_modify(self.obj, in_mailbox, len(in_bytes), + out_mailbox, outlen) + try: + if rc: + raise PyverbsRDMAError('Failed to modify DevX object', rc) + out = out_mailbox[:outlen] + finally: + free(in_mailbox) + free(out_mailbox) + return out + + @property + def out_view(self): + return self.out_view + + def __dealloc__(self): + self.close() + + cpdef close(self): + if self.obj != NULL: + self.logger.debug('Closing Mlx5DvexObj') + rc = dv.mlx5dv_devx_obj_destroy(self.obj) + if rc: + raise PyverbsRDMAError('Failed to destroy a DevX object', rc) + self.obj = NULL + self.context = None + + cdef class Mlx5Context(Context): """ Represent mlx5 context, which extends Context. @@ -159,6 +257,7 @@ cdef class Mlx5Context(Context): raise PyverbsRDMAErrno('Failed to open mlx5 context on {dev}' .format(dev=self.name)) self.devx_umems = weakref.WeakSet() + self.devx_objs = weakref.WeakSet() def query_mlx5_device(self, comp_mask=-1): """ @@ -280,6 +379,8 @@ cdef class Mlx5Context(Context): except PyverbsError: if isinstance(obj, Mlx5UMEM): self.devx_umems.add(obj) + elif isinstance(obj, Mlx5DevxObj): + self.devx_objs.add(obj) else: raise PyverbsError('Unrecognized object type') @@ -288,7 +389,7 @@ cdef class Mlx5Context(Context): cpdef close(self): if self.context != NULL: - close_weakrefs([self.pps, self.devx_umems]) + close_weakrefs([self.pps, self.devx_objs, self.devx_umems]) super(Mlx5Context, self).close() -- 1.8.3.1