[PATCH rdma-next v2 0/7] Add Enhanced Connection Established (ECE)

[PATCH rdma-next v2 0/7] Add Enhanced Connection Established (ECE)

[Leon Romanovsky]

From: Leon Romanovsky <leonro@mellanox.com>

Changelog:
 v2:
 * Rebased on latest rdma-next and removed already accepted patches.
 * Updated all rdma_reject in-kernel users to provide reject reason.
 v1: Dropped field_avail patch in favor of mass conversion to use function
     which already exists in the kernel code.
 https://lore.kernel.org/lkml/20200310091438.248429-1-leon@kernel.org
 v0: https://lore.kernel.org/lkml/20200305150105.207959-1-leon@kernel.org

Enhanced Connection Established or ECE is new negotiation scheme
introduced in IBTA v1.4 to exchange extra information about nodes
capabilities and later negotiate them at the connection establishment
phase.

The RDMA-CM messages (REQ, REP, SIDR_REQ and SIDR_REP) were extended
to carry two fields, one new and another gained new functionality:
 * VendorID is a new field that indicates that common subset of vendor
   option bits are supported as indicated by that VendorID.
 * AttributeModifier already exists, but overloaded to indicate which
   vendor options are supported by this VendorID.

This is kernel part of such functionality which is responsible to get data
from librdmacm and properly create and handle RDMA-CM messages.

Thanks

Leon Romanovsky (7):
  RDMA/cm: Add Enhanced Connection Establishment (ECE) bits
  RDMA/uapi: Add ECE definitions to UCMA
  RDMA/ucma: Extend ucma_connect to receive ECE parameters
  RDMA/ucma: Deliver ECE parameters through UCMA events
  RDMA/cm: Send and receive ECE parameter over the wire
  RDMA/cma: Connect ECE to rdma_accept
  RDMA/cma: Provide ECE reject reason

 drivers/infiniband/core/cm.c            | 41 ++++++++++++++++---
 drivers/infiniband/core/cma.c           | 52 ++++++++++++++++++++++---
 drivers/infiniband/core/cma_priv.h      |  1 +
 drivers/infiniband/core/ucma.c          | 40 +++++++++++++++----
 drivers/infiniband/ulp/isert/ib_isert.c |  4 +-
 drivers/infiniband/ulp/srpt/ib_srpt.c   |  2 +-
 drivers/nvme/target/rdma.c              |  2 +-
 include/rdma/ib_cm.h                    | 10 ++++-
 include/rdma/ibta_vol1_c12.h            |  6 +++
 include/rdma/rdma_cm.h                  | 18 ++++++++-
 include/uapi/rdma/rdma_user_cm.h        | 15 ++++++-
 net/rds/ib_cm.c                         |  2 +-
 12 files changed, 167 insertions(+), 26 deletions(-)

--
2.25.2


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[PATCH rdma-next v2 7/7] RDMA/cma: Provide ECE reject reason

[Leon Romanovsky]

From: Leon Romanovsky <leonro@mellanox.com>

IBTA declares "vendor option not supported" reject reason in REJ
messages if passive side doesn't want to accept proposed ECE options.

Due to the fact that ECE is managed by userspace, there is a need to let
users to provide such rejected reason.

Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
---
 drivers/infiniband/core/cma.c           | 12 +++++++-----
 drivers/infiniband/core/ucma.c          |  7 ++++++-
 drivers/infiniband/ulp/isert/ib_isert.c |  4 ++--
 drivers/infiniband/ulp/srpt/ib_srpt.c   |  2 +-
 drivers/nvme/target/rdma.c              |  2 +-
 include/rdma/ib_cm.h                    |  3 ++-
 include/rdma/rdma_cm.h                  |  3 ++-
 include/uapi/rdma/rdma_user_cm.h        |  7 ++++++-
 net/rds/ib_cm.c                         |  2 +-
 9 files changed, 28 insertions(+), 14 deletions(-)

diff --git a/drivers/infiniband/core/cma.c b/drivers/infiniband/core/cma.c
index 409f752f40ae..b79f71b10593 100644
--- a/drivers/infiniband/core/cma.c
+++ b/drivers/infiniband/core/cma.c
@@ -4183,7 +4183,7 @@ int __rdma_accept(struct rdma_cm_id *id, struct rdma_conn_param *conn_param,
 	return 0;
 reject:
 	cma_modify_qp_err(id_priv);
-	rdma_reject(id, NULL, 0);
+	rdma_reject(id, NULL, 0, 0);
 	return ret;
 }
 EXPORT_SYMBOL(__rdma_accept);
@@ -4223,7 +4223,7 @@ int rdma_notify(struct rdma_cm_id *id, enum ib_event_type event)
 EXPORT_SYMBOL(rdma_notify);
 
 int rdma_reject(struct rdma_cm_id *id, const void *private_data,
-		u8 private_data_len)
+		u8 private_data_len, enum rdma_ucm_reject_reason reason)
 {
 	struct rdma_id_private *id_priv;
 	int ret;
@@ -4237,10 +4237,12 @@ int rdma_reject(struct rdma_cm_id *id, const void *private_data,
 			ret = cma_send_sidr_rep(id_priv, IB_SIDR_REJECT, 0,
 						private_data, private_data_len);
 		} else {
+			enum ib_cm_rej_reason r =
+				(reason) ?: IB_CM_REJ_CONSUMER_DEFINED;
+
 			trace_cm_send_rej(id_priv);
-			ret = ib_send_cm_rej(id_priv->cm_id.ib,
-					     IB_CM_REJ_CONSUMER_DEFINED, NULL,
-					     0, private_data, private_data_len);
+			ret = ib_send_cm_rej(id_priv->cm_id.ib, r, NULL, 0,
+					     private_data, private_data_len);
 		}
 	} else if (rdma_cap_iw_cm(id->device, id->port_num)) {
 		ret = iw_cm_reject(id_priv->cm_id.iw,
diff --git a/drivers/infiniband/core/ucma.c b/drivers/infiniband/core/ucma.c
index d41598954cc4..99482dc5934b 100644
--- a/drivers/infiniband/core/ucma.c
+++ b/drivers/infiniband/core/ucma.c
@@ -1178,12 +1178,17 @@ static ssize_t ucma_reject(struct ucma_file *file, const char __user *inbuf,
 	if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
 		return -EFAULT;
 
+	if (cmd.reason &&
+	    cmd.reason != RDMA_USER_CM_REJ_VENDOR_OPTION_NOT_SUPPORTED)
+		return -EINVAL;
+
 	ctx = ucma_get_ctx_dev(file, cmd.id);
 	if (IS_ERR(ctx))
 		return PTR_ERR(ctx);
 
 	mutex_lock(&ctx->mutex);
-	ret = rdma_reject(ctx->cm_id, cmd.private_data, cmd.private_data_len);
+	ret = rdma_reject(ctx->cm_id, cmd.private_data, cmd.private_data_len,
+			  cmd.reason);
 	mutex_unlock(&ctx->mutex);
 	ucma_put_ctx(ctx);
 	return ret;
diff --git a/drivers/infiniband/ulp/isert/ib_isert.c b/drivers/infiniband/ulp/isert/ib_isert.c
index a1a035270cab..42f78d0b61cc 100644
--- a/drivers/infiniband/ulp/isert/ib_isert.c
+++ b/drivers/infiniband/ulp/isert/ib_isert.c
@@ -502,7 +502,7 @@ isert_connect_request(struct rdma_cm_id *cma_id, struct rdma_cm_event *event)
 	if (!np->enabled) {
 		spin_unlock_bh(&np->np_thread_lock);
 		isert_dbg("iscsi_np is not enabled, reject connect request\n");
-		return rdma_reject(cma_id, NULL, 0);
+		return rdma_reject(cma_id, NULL, 0, 0);
 	}
 	spin_unlock_bh(&np->np_thread_lock);
 
@@ -553,7 +553,7 @@ isert_connect_request(struct rdma_cm_id *cma_id, struct rdma_cm_event *event)
 	isert_free_login_buf(isert_conn);
 out:
 	kfree(isert_conn);
-	rdma_reject(cma_id, NULL, 0);
+	rdma_reject(cma_id, NULL, 0, 0);
 	return ret;
 }
 
diff --git a/drivers/infiniband/ulp/srpt/ib_srpt.c b/drivers/infiniband/ulp/srpt/ib_srpt.c
index 7047f6a5d0a3..44eefa83bfc6 100644
--- a/drivers/infiniband/ulp/srpt/ib_srpt.c
+++ b/drivers/infiniband/ulp/srpt/ib_srpt.c
@@ -2496,7 +2496,7 @@ static int srpt_cm_req_recv(struct srpt_device *const sdev,
 				   SRP_BUF_FORMAT_INDIRECT);
 
 	if (rdma_cm_id)
-		rdma_reject(rdma_cm_id, rej, sizeof(*rej));
+		rdma_reject(rdma_cm_id, rej, sizeof(*rej), 0);
 	else
 		ib_send_cm_rej(ib_cm_id, IB_CM_REJ_CONSUMER_DEFINED, NULL, 0,
 			       rej, sizeof(*rej));
diff --git a/drivers/nvme/target/rdma.c b/drivers/nvme/target/rdma.c
index fd47de0e4e4e..9f3fea89b254 100644
--- a/drivers/nvme/target/rdma.c
+++ b/drivers/nvme/target/rdma.c
@@ -1138,7 +1138,7 @@ static int nvmet_rdma_cm_reject(struct rdma_cm_id *cm_id,
 	rej.recfmt = cpu_to_le16(NVME_RDMA_CM_FMT_1_0);
 	rej.sts = cpu_to_le16(status);
 
-	return rdma_reject(cm_id, (void *)&rej, sizeof(rej));
+	return rdma_reject(cm_id, (void *)&rej, sizeof(rej), 0);
 }
 
 static struct nvmet_rdma_queue *
diff --git a/include/rdma/ib_cm.h b/include/rdma/ib_cm.h
index 0f1ea5f2d01c..ed328a99ed0a 100644
--- a/include/rdma/ib_cm.h
+++ b/include/rdma/ib_cm.h
@@ -168,7 +168,8 @@ enum ib_cm_rej_reason {
 	IB_CM_REJ_INVALID_CLASS_VERSION		= 31,
 	IB_CM_REJ_INVALID_FLOW_LABEL		= 32,
 	IB_CM_REJ_INVALID_ALT_FLOW_LABEL	= 33,
-	IB_CM_REJ_VENDOR_OPTION_NOT_SUPPORTED	= 35,
+	IB_CM_REJ_VENDOR_OPTION_NOT_SUPPORTED	=
+		RDMA_USER_CM_REJ_VENDOR_OPTION_NOT_SUPPORTED,
 };
 
 struct ib_cm_rej_event_param {
diff --git a/include/rdma/rdma_cm.h b/include/rdma/rdma_cm.h
index 8d961d8b7cdb..f8781b132f62 100644
--- a/include/rdma/rdma_cm.h
+++ b/include/rdma/rdma_cm.h
@@ -324,11 +324,12 @@ int __rdma_accept_ece(struct rdma_cm_id *id, struct rdma_conn_param *conn_param,
  */
 int rdma_notify(struct rdma_cm_id *id, enum ib_event_type event);
 
+
 /**
  * rdma_reject - Called to reject a connection request or response.
  */
 int rdma_reject(struct rdma_cm_id *id, const void *private_data,
-		u8 private_data_len);
+		u8 private_data_len, enum rdma_ucm_reject_reason reason);
 
 /**
  * rdma_disconnect - This function disconnects the associated QP and
diff --git a/include/uapi/rdma/rdma_user_cm.h b/include/uapi/rdma/rdma_user_cm.h
index c4ca1412bcf9..e545f2de1e13 100644
--- a/include/uapi/rdma/rdma_user_cm.h
+++ b/include/uapi/rdma/rdma_user_cm.h
@@ -78,6 +78,10 @@ enum rdma_ucm_port_space {
 	RDMA_PS_UDP   = 0x0111,
 };
 
+enum rdma_ucm_reject_reason {
+	RDMA_USER_CM_REJ_VENDOR_OPTION_NOT_SUPPORTED = 35
+};
+
 /*
  * command ABI structures.
  */
@@ -234,7 +238,8 @@ struct rdma_ucm_accept {
 struct rdma_ucm_reject {
 	__u32 id;
 	__u8  private_data_len;
-	__u8  reserved[3];
+	__u8  reason; /* enum rdma_ucm_reject_reason */
+	__u8  reserved[2];
 	__u8  private_data[RDMA_MAX_PRIVATE_DATA];
 };
 
diff --git a/net/rds/ib_cm.c b/net/rds/ib_cm.c
index c71f4328d138..bac8c68df66c 100644
--- a/net/rds/ib_cm.c
+++ b/net/rds/ib_cm.c
@@ -927,7 +927,7 @@ int rds_ib_cm_handle_connect(struct rdma_cm_id *cm_id,
 	if (conn)
 		mutex_unlock(&conn->c_cm_lock);
 	if (err)
-		rdma_reject(cm_id, &err, sizeof(int));
+		rdma_reject(cm_id, &err, sizeof(int), 0);
 	return destroy;
 }
 
-- 
2.25.2


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Re: [PATCH rdma-next v2 0/7] Add Enhanced Connection Established (ECE)

[Leon Romanovsky]

On Mon, Apr 13, 2020 at 05:15:31PM +0300, Leon Romanovsky wrote:
> From: Leon Romanovsky <leonro@mellanox.com>
>
> Changelog:
>  v2:
>  * Rebased on latest rdma-next and removed already accepted patches.
>  * Updated all rdma_reject in-kernel users to provide reject reason.
>  v1: Dropped field_avail patch in favor of mass conversion to use function
>      which already exists in the kernel code.
>  https://lore.kernel.org/lkml/20200310091438.248429-1-leon@kernel.org
>  v0: https://lore.kernel.org/lkml/20200305150105.207959-1-leon@kernel.org
>
> Enhanced Connection Established or ECE is new negotiation scheme
> introduced in IBTA v1.4 to exchange extra information about nodes
> capabilities and later negotiate them at the connection establishment
> phase.
>
> The RDMA-CM messages (REQ, REP, SIDR_REQ and SIDR_REP) were extended
> to carry two fields, one new and another gained new functionality:
>  * VendorID is a new field that indicates that common subset of vendor
>    option bits are supported as indicated by that VendorID.
>  * AttributeModifier already exists, but overloaded to indicate which
>    vendor options are supported by this VendorID.
>
> This is kernel part of such functionality which is responsible to get data
> from librdmacm and properly create and handle RDMA-CM messages.
>
> Thanks
>
> Leon Romanovsky (7):
>   RDMA/cm: Add Enhanced Connection Establishment (ECE) bits
>   RDMA/uapi: Add ECE definitions to UCMA
>   RDMA/ucma: Extend ucma_connect to receive ECE parameters
>   RDMA/ucma: Deliver ECE parameters through UCMA events
>   RDMA/cm: Send and receive ECE parameter over the wire
>   RDMA/cma: Connect ECE to rdma_accept
>   RDMA/cma: Provide ECE reject reason

PR: https://github.com/linux-rdma/rdma-core/pull/745

Thanks

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Re: [PATCH rdma-next v2 7/7] RDMA/cma: Provide ECE reject reason

[Jason Gunthorpe]

On Mon, Apr 13, 2020 at 05:15:38PM +0300, Leon Romanovsky wrote:
> @@ -4223,7 +4223,7 @@ int rdma_notify(struct rdma_cm_id *id, enum ib_event_type event)
>  EXPORT_SYMBOL(rdma_notify);
>  
>  int rdma_reject(struct rdma_cm_id *id, const void *private_data,
> -		u8 private_data_len)
> +		u8 private_data_len, enum rdma_ucm_reject_reason reason)
>  {
>  	struct rdma_id_private *id_priv;
>  	int ret;
> @@ -4237,10 +4237,12 @@ int rdma_reject(struct rdma_cm_id *id, const void *private_data,
>  			ret = cma_send_sidr_rep(id_priv, IB_SIDR_REJECT, 0,
>  						private_data, private_data_len);
>  		} else {
> +			enum ib_cm_rej_reason r =
> +				(reason) ?: IB_CM_REJ_CONSUMER_DEFINED;
> +
>  			trace_cm_send_rej(id_priv);
> -			ret = ib_send_cm_rej(id_priv->cm_id.ib,
> -					     IB_CM_REJ_CONSUMER_DEFINED, NULL,
> -					     0, private_data, private_data_len);
> +			ret = ib_send_cm_rej(id_priv->cm_id.ib, r, NULL, 0,
> +					     private_data, private_data_len);
>  		}
>  	} else if (rdma_cap_iw_cm(id->device, id->port_num)) {
>  		ret = iw_cm_reject(id_priv->cm_id.iw,
> diff --git a/drivers/infiniband/core/ucma.c b/drivers/infiniband/core/ucma.c
> index d41598954cc4..99482dc5934b 100644
> +++ b/drivers/infiniband/core/ucma.c
> @@ -1178,12 +1178,17 @@ static ssize_t ucma_reject(struct ucma_file *file, const char __user *inbuf,
>  	if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
>  		return -EFAULT;
>  
> +	if (cmd.reason &&
> +	    cmd.reason != RDMA_USER_CM_REJ_VENDOR_OPTION_NOT_SUPPORTED)
> +		return -EINVAL;

It would be clearer to set cmd.reason to IB_CM_REJ_CONSUMER_DEFINED at
this point.. 

if (!cmd.reason)
   cmd.reason = IB_CM_REJ_CONSUMER_DEFINED

if (cmd.reason != IB_CM_REJ_CONSUMER_DEFINED && cmd.reason !=
    RDMA_USER_CM_REJ_VENDOR_OPTION_NOT_SUPPORTED)
   return -EINVAL

Esaier to follow and no reason userspace shouldn't be able to
explicitly specifiy the reason's that it is allowed to use.


> index 8d961d8b7cdb..f8781b132f62 100644
> +++ b/include/rdma/rdma_cm.h
> @@ -324,11 +324,12 @@ int __rdma_accept_ece(struct rdma_cm_id *id, struct rdma_conn_param *conn_param,
>   */
>  int rdma_notify(struct rdma_cm_id *id, enum ib_event_type event);
>  
> +
>  /**

Extra hunk?

>   * rdma_reject - Called to reject a connection request or response.
>   */
>  int rdma_reject(struct rdma_cm_id *id, const void *private_data,
> -		u8 private_data_len);
> +		u8 private_data_len, enum rdma_ucm_reject_reason reason);
>  
>  /**
>   * rdma_disconnect - This function disconnects the associated QP and
> diff --git a/include/uapi/rdma/rdma_user_cm.h b/include/uapi/rdma/rdma_user_cm.h
> index c4ca1412bcf9..e545f2de1e13 100644
> +++ b/include/uapi/rdma/rdma_user_cm.h
> @@ -78,6 +78,10 @@ enum rdma_ucm_port_space {
>  	RDMA_PS_UDP   = 0x0111,
>  };
>  
> +enum rdma_ucm_reject_reason {
> +	RDMA_USER_CM_REJ_VENDOR_OPTION_NOT_SUPPORTED = 35
> +};

not sure we need ABI defines for IBTA constants?

Jason

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Re: [PATCH rdma-next v2 7/7] RDMA/cma: Provide ECE reject reason

[Leon Romanovsky]

On Mon, May 25, 2020 at 03:14:17PM -0300, Jason Gunthorpe wrote:
> On Mon, Apr 13, 2020 at 05:15:38PM +0300, Leon Romanovsky wrote:
> > @@ -4223,7 +4223,7 @@ int rdma_notify(struct rdma_cm_id *id, enum ib_event_type event)
> >  EXPORT_SYMBOL(rdma_notify);
> >
> >  int rdma_reject(struct rdma_cm_id *id, const void *private_data,
> > -		u8 private_data_len)
> > +		u8 private_data_len, enum rdma_ucm_reject_reason reason)
> >  {
> >  	struct rdma_id_private *id_priv;
> >  	int ret;
> > @@ -4237,10 +4237,12 @@ int rdma_reject(struct rdma_cm_id *id, const void *private_data,
> >  			ret = cma_send_sidr_rep(id_priv, IB_SIDR_REJECT, 0,
> >  						private_data, private_data_len);
> >  		} else {
> > +			enum ib_cm_rej_reason r =
> > +				(reason) ?: IB_CM_REJ_CONSUMER_DEFINED;
> > +
> >  			trace_cm_send_rej(id_priv);
> > -			ret = ib_send_cm_rej(id_priv->cm_id.ib,
> > -					     IB_CM_REJ_CONSUMER_DEFINED, NULL,
> > -					     0, private_data, private_data_len);
> > +			ret = ib_send_cm_rej(id_priv->cm_id.ib, r, NULL, 0,
> > +					     private_data, private_data_len);
> >  		}
> >  	} else if (rdma_cap_iw_cm(id->device, id->port_num)) {
> >  		ret = iw_cm_reject(id_priv->cm_id.iw,
> > diff --git a/drivers/infiniband/core/ucma.c b/drivers/infiniband/core/ucma.c
> > index d41598954cc4..99482dc5934b 100644
> > +++ b/drivers/infiniband/core/ucma.c
> > @@ -1178,12 +1178,17 @@ static ssize_t ucma_reject(struct ucma_file *file, const char __user *inbuf,
> >  	if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
> >  		return -EFAULT;
> >
> > +	if (cmd.reason &&
> > +	    cmd.reason != RDMA_USER_CM_REJ_VENDOR_OPTION_NOT_SUPPORTED)
> > +		return -EINVAL;
>
> It would be clearer to set cmd.reason to IB_CM_REJ_CONSUMER_DEFINED at
> this point..
>
> if (!cmd.reason)
>    cmd.reason = IB_CM_REJ_CONSUMER_DEFINED
>
> if (cmd.reason != IB_CM_REJ_CONSUMER_DEFINED && cmd.reason !=
>     RDMA_USER_CM_REJ_VENDOR_OPTION_NOT_SUPPORTED)
>    return -EINVAL
>
> Esaier to follow and no reason userspace shouldn't be able to
> explicitly specifiy the reason's that it is allowed to use.
>
>
> > index 8d961d8b7cdb..f8781b132f62 100644
> > +++ b/include/rdma/rdma_cm.h
> > @@ -324,11 +324,12 @@ int __rdma_accept_ece(struct rdma_cm_id *id, struct rdma_conn_param *conn_param,
> >   */
> >  int rdma_notify(struct rdma_cm_id *id, enum ib_event_type event);
> >
> > +
> >  /**
>
> Extra hunk?
>
> >   * rdma_reject - Called to reject a connection request or response.
> >   */
> >  int rdma_reject(struct rdma_cm_id *id, const void *private_data,
> > -		u8 private_data_len);
> > +		u8 private_data_len, enum rdma_ucm_reject_reason reason);
> >
> >  /**
> >   * rdma_disconnect - This function disconnects the associated QP and
> > diff --git a/include/uapi/rdma/rdma_user_cm.h b/include/uapi/rdma/rdma_user_cm.h
> > index c4ca1412bcf9..e545f2de1e13 100644
> > +++ b/include/uapi/rdma/rdma_user_cm.h
> > @@ -78,6 +78,10 @@ enum rdma_ucm_port_space {
> >  	RDMA_PS_UDP   = 0x0111,
> >  };
> >
> > +enum rdma_ucm_reject_reason {
> > +	RDMA_USER_CM_REJ_VENDOR_OPTION_NOT_SUPPORTED = 35
> > +};
>
> not sure we need ABI defines for IBTA constants?

Do you want to give an option to write any number?
Right now, I'm enforcing only allowed by IBTA reason
and which is used in user space.

Thanks

>
> Jason

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Re: [PATCH rdma-next v2 7/7] RDMA/cma: Provide ECE reject reason

[Jason Gunthorpe]

On Mon, May 25, 2020 at 09:22:42PM +0300, Leon Romanovsky wrote:
> On Mon, May 25, 2020 at 03:14:17PM -0300, Jason Gunthorpe wrote:
> > On Mon, Apr 13, 2020 at 05:15:38PM +0300, Leon Romanovsky wrote:
> > > @@ -4223,7 +4223,7 @@ int rdma_notify(struct rdma_cm_id *id, enum ib_event_type event)
> > >  EXPORT_SYMBOL(rdma_notify);
> > >
> > >  int rdma_reject(struct rdma_cm_id *id, const void *private_data,
> > > -		u8 private_data_len)
> > > +		u8 private_data_len, enum rdma_ucm_reject_reason reason)
> > >  {
> > >  	struct rdma_id_private *id_priv;
> > >  	int ret;
> > > @@ -4237,10 +4237,12 @@ int rdma_reject(struct rdma_cm_id *id, const void *private_data,
> > >  			ret = cma_send_sidr_rep(id_priv, IB_SIDR_REJECT, 0,
> > >  						private_data, private_data_len);
> > >  		} else {
> > > +			enum ib_cm_rej_reason r =
> > > +				(reason) ?: IB_CM_REJ_CONSUMER_DEFINED;
> > > +
> > >  			trace_cm_send_rej(id_priv);
> > > -			ret = ib_send_cm_rej(id_priv->cm_id.ib,
> > > -					     IB_CM_REJ_CONSUMER_DEFINED, NULL,
> > > -					     0, private_data, private_data_len);
> > > +			ret = ib_send_cm_rej(id_priv->cm_id.ib, r, NULL, 0,
> > > +					     private_data, private_data_len);
> > >  		}
> > >  	} else if (rdma_cap_iw_cm(id->device, id->port_num)) {
> > >  		ret = iw_cm_reject(id_priv->cm_id.iw,
> > > diff --git a/drivers/infiniband/core/ucma.c b/drivers/infiniband/core/ucma.c
> > > index d41598954cc4..99482dc5934b 100644
> > > +++ b/drivers/infiniband/core/ucma.c
> > > @@ -1178,12 +1178,17 @@ static ssize_t ucma_reject(struct ucma_file *file, const char __user *inbuf,
> > >  	if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
> > >  		return -EFAULT;
> > >
> > > +	if (cmd.reason &&
> > > +	    cmd.reason != RDMA_USER_CM_REJ_VENDOR_OPTION_NOT_SUPPORTED)
> > > +		return -EINVAL;
> >
> > It would be clearer to set cmd.reason to IB_CM_REJ_CONSUMER_DEFINED at
> > this point..
> >
> > if (!cmd.reason)
> >    cmd.reason = IB_CM_REJ_CONSUMER_DEFINED
> >
> > if (cmd.reason != IB_CM_REJ_CONSUMER_DEFINED && cmd.reason !=
> >     RDMA_USER_CM_REJ_VENDOR_OPTION_NOT_SUPPORTED)
> >    return -EINVAL
> >
> > Esaier to follow and no reason userspace shouldn't be able to
> > explicitly specifiy the reason's that it is allowed to use.
> >
> >
> > > index 8d961d8b7cdb..f8781b132f62 100644
> > > +++ b/include/rdma/rdma_cm.h
> > > @@ -324,11 +324,12 @@ int __rdma_accept_ece(struct rdma_cm_id *id, struct rdma_conn_param *conn_param,
> > >   */
> > >  int rdma_notify(struct rdma_cm_id *id, enum ib_event_type event);
> > >
> > > +
> > >  /**
> >
> > Extra hunk?
> >
> > >   * rdma_reject - Called to reject a connection request or response.
> > >   */
> > >  int rdma_reject(struct rdma_cm_id *id, const void *private_data,
> > > -		u8 private_data_len);
> > > +		u8 private_data_len, enum rdma_ucm_reject_reason reason);
> > >
> > >  /**
> > >   * rdma_disconnect - This function disconnects the associated QP and
> > > diff --git a/include/uapi/rdma/rdma_user_cm.h b/include/uapi/rdma/rdma_user_cm.h
> > > index c4ca1412bcf9..e545f2de1e13 100644
> > > +++ b/include/uapi/rdma/rdma_user_cm.h
> > > @@ -78,6 +78,10 @@ enum rdma_ucm_port_space {
> > >  	RDMA_PS_UDP   = 0x0111,
> > >  };
> > >
> > > +enum rdma_ucm_reject_reason {
> > > +	RDMA_USER_CM_REJ_VENDOR_OPTION_NOT_SUPPORTED = 35
> > > +};
> >
> > not sure we need ABI defines for IBTA constants?
> 
> Do you want to give an option to write any number?
> Right now, I'm enforcing only allowed by IBTA reason
> and which is used in user space.

no, just the allowed numbers, just wondering if we need constants for
fixed IBTA values .. 

Jason

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Re: [PATCH rdma-next v2 7/7] RDMA/cma: Provide ECE reject reason

[Leon Romanovsky]

On Mon, May 25, 2020 at 03:36:47PM -0300, Jason Gunthorpe wrote:
> On Mon, May 25, 2020 at 09:22:42PM +0300, Leon Romanovsky wrote:
> > On Mon, May 25, 2020 at 03:14:17PM -0300, Jason Gunthorpe wrote:
> > > On Mon, Apr 13, 2020 at 05:15:38PM +0300, Leon Romanovsky wrote:
> > > > @@ -4223,7 +4223,7 @@ int rdma_notify(struct rdma_cm_id *id, enum ib_event_type event)
> > > >  EXPORT_SYMBOL(rdma_notify);
> > > >
> > > >  int rdma_reject(struct rdma_cm_id *id, const void *private_data,
> > > > -		u8 private_data_len)
> > > > +		u8 private_data_len, enum rdma_ucm_reject_reason reason)
> > > >  {
> > > >  	struct rdma_id_private *id_priv;
> > > >  	int ret;
> > > > @@ -4237,10 +4237,12 @@ int rdma_reject(struct rdma_cm_id *id, const void *private_data,
> > > >  			ret = cma_send_sidr_rep(id_priv, IB_SIDR_REJECT, 0,
> > > >  						private_data, private_data_len);
> > > >  		} else {
> > > > +			enum ib_cm_rej_reason r =
> > > > +				(reason) ?: IB_CM_REJ_CONSUMER_DEFINED;
> > > > +
> > > >  			trace_cm_send_rej(id_priv);
> > > > -			ret = ib_send_cm_rej(id_priv->cm_id.ib,
> > > > -					     IB_CM_REJ_CONSUMER_DEFINED, NULL,
> > > > -					     0, private_data, private_data_len);
> > > > +			ret = ib_send_cm_rej(id_priv->cm_id.ib, r, NULL, 0,
> > > > +					     private_data, private_data_len);
> > > >  		}
> > > >  	} else if (rdma_cap_iw_cm(id->device, id->port_num)) {
> > > >  		ret = iw_cm_reject(id_priv->cm_id.iw,
> > > > diff --git a/drivers/infiniband/core/ucma.c b/drivers/infiniband/core/ucma.c
> > > > index d41598954cc4..99482dc5934b 100644
> > > > +++ b/drivers/infiniband/core/ucma.c
> > > > @@ -1178,12 +1178,17 @@ static ssize_t ucma_reject(struct ucma_file *file, const char __user *inbuf,
> > > >  	if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
> > > >  		return -EFAULT;
> > > >
> > > > +	if (cmd.reason &&
> > > > +	    cmd.reason != RDMA_USER_CM_REJ_VENDOR_OPTION_NOT_SUPPORTED)
> > > > +		return -EINVAL;
> > >
> > > It would be clearer to set cmd.reason to IB_CM_REJ_CONSUMER_DEFINED at
> > > this point..
> > >
> > > if (!cmd.reason)
> > >    cmd.reason = IB_CM_REJ_CONSUMER_DEFINED
> > >
> > > if (cmd.reason != IB_CM_REJ_CONSUMER_DEFINED && cmd.reason !=
> > >     RDMA_USER_CM_REJ_VENDOR_OPTION_NOT_SUPPORTED)
> > >    return -EINVAL
> > >
> > > Esaier to follow and no reason userspace shouldn't be able to
> > > explicitly specifiy the reason's that it is allowed to use.
> > >
> > >
> > > > index 8d961d8b7cdb..f8781b132f62 100644
> > > > +++ b/include/rdma/rdma_cm.h
> > > > @@ -324,11 +324,12 @@ int __rdma_accept_ece(struct rdma_cm_id *id, struct rdma_conn_param *conn_param,
> > > >   */
> > > >  int rdma_notify(struct rdma_cm_id *id, enum ib_event_type event);
> > > >
> > > > +
> > > >  /**
> > >
> > > Extra hunk?
> > >
> > > >   * rdma_reject - Called to reject a connection request or response.
> > > >   */
> > > >  int rdma_reject(struct rdma_cm_id *id, const void *private_data,
> > > > -		u8 private_data_len);
> > > > +		u8 private_data_len, enum rdma_ucm_reject_reason reason);
> > > >
> > > >  /**
> > > >   * rdma_disconnect - This function disconnects the associated QP and
> > > > diff --git a/include/uapi/rdma/rdma_user_cm.h b/include/uapi/rdma/rdma_user_cm.h
> > > > index c4ca1412bcf9..e545f2de1e13 100644
> > > > +++ b/include/uapi/rdma/rdma_user_cm.h
> > > > @@ -78,6 +78,10 @@ enum rdma_ucm_port_space {
> > > >  	RDMA_PS_UDP   = 0x0111,
> > > >  };
> > > >
> > > > +enum rdma_ucm_reject_reason {
> > > > +	RDMA_USER_CM_REJ_VENDOR_OPTION_NOT_SUPPORTED = 35
> > > > +};
> > >
> > > not sure we need ABI defines for IBTA constants?
> >
> > Do you want to give an option to write any number?
> > Right now, I'm enforcing only allowed by IBTA reason
> > and which is used in user space.
>
> no, just the allowed numbers, just wondering if we need constants for
> fixed IBTA values ..

I will take a look.

Thanks

>
> Jason

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