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RDMA/cm: Use DLID from inbound/outbound PathRecords as the datapath DLID

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In inter-subnet cases, when inbound/outbound PRs are available,
outbound_PR.dlid is used as the requestor's datapath DLID and
inbound_PR.dlid is used as the responder's DLID. The inbound_PR.dlid
is passed to responder side with the "ConnectReq.Primary_Local_Port_LID"
field. With this solution the PERMISSIVE_LID is no longer used in
Primary Local LID field.

Signed-off-by: Mark Zhang <markzhang@nvidia.com>
Reviewed-by: Mark Bloch <mbloch@nvidia.com>
Link: https://lore.kernel.org/r/b3f6cac685bce9dde37c610be82e2c19d9e51d9e.1662631201.git.leonro@nvidia.com
Signed-off-by: Leon Romanovsky <leon@kernel.org>
This commit is contained in:
Mark Zhang 2022-09-08 13:09:03 +03:00 committed by Leon Romanovsky
parent b7d95040c1
commit eb8336dbe3
3 changed files with 27 additions and 2 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

23
drivers/infiniband/core/cm.c
View file

@ -175,6 +175,7 @@ struct cm_device {
struct cm_av {
struct cm_port *port;
struct rdma_ah_attr ah_attr;
u16 dlid_datapath;
u16 pkey_index;
u8 timeout;
};
@ -1304,6 +1305,7 @@ static void cm_format_req(struct cm_req_msg *req_msg,
struct sa_path_rec *pri_path = param->primary_path;
struct sa_path_rec *alt_path = param->alternate_path;
bool pri_ext = false;
__be16 lid;
if (pri_path->rec_type == SA_PATH_REC_TYPE_OPA)
pri_ext = opa_is_extended_lid(pri_path->opa.dlid,
@ -1363,9 +1365,16 @@ static void cm_format_req(struct cm_req_msg *req_msg,
htons(ntohl(sa_path_get_dlid(
pri_path)))));
} else {
/* Work-around until there's a way to obtain remote LID info */
if (param->primary_path_inbound) {
lid = param->primary_path_inbound->ib.dlid;
IBA_SET(CM_REQ_PRIMARY_LOCAL_PORT_LID, req_msg,
be16_to_cpu(lid));
} else
IBA_SET(CM_REQ_PRIMARY_LOCAL_PORT_LID, req_msg,
be16_to_cpu(IB_LID_PERMISSIVE));
/* Work-around until there's a way to obtain remote LID info */
IBA_SET(CM_REQ_PRIMARY_REMOTE_PORT_LID, req_msg,
be16_to_cpu(IB_LID_PERMISSIVE));
}
@ -1520,6 +1529,10 @@ int ib_send_cm_req(struct ib_cm_id *cm_id,
spin_lock_irqsave(&cm_id_priv->lock, flags);
cm_move_av_from_path(&cm_id_priv->av, &av);
if (param->primary_path_outbound)
cm_id_priv->av.dlid_datapath =
be16_to_cpu(param->primary_path_outbound->ib.dlid);
if (param->alternate_path)
cm_move_av_from_path(&cm_id_priv->alt_av, &alt_av);
@ -2154,6 +2167,10 @@ static int cm_req_handler(struct cm_work *work)
NULL, 0);
goto rejected;
}
if (cm_id_priv->av.ah_attr.type == RDMA_AH_ATTR_TYPE_IB)
cm_id_priv->av.dlid_datapath =
IBA_GET(CM_REQ_PRIMARY_LOCAL_PORT_LID, req_msg);
if (cm_req_has_alt_path(req_msg)) {
ret = cm_init_av_by_path(&work->path[1], NULL,
&cm_id_priv->alt_av);
@ -4113,6 +4130,10 @@ static int cm_init_qp_rtr_attr(struct cm_id_private *cm_id_priv,
*qp_attr_mask = IB_QP_STATE | IB_QP_AV | IB_QP_PATH_MTU |
IB_QP_DEST_QPN | IB_QP_RQ_PSN;
qp_attr->ah_attr = cm_id_priv->av.ah_attr;
if ((qp_attr->ah_attr.type == RDMA_AH_ATTR_TYPE_IB) &&
cm_id_priv->av.dlid_datapath &&
(cm_id_priv->av.dlid_datapath != 0xffff))
qp_attr->ah_attr.ib.dlid = cm_id_priv->av.dlid_datapath;
qp_attr->path_mtu = cm_id_priv->path_mtu;
qp_attr->dest_qp_num = be32_to_cpu(cm_id_priv->remote_qpn);
qp_attr->rq_psn = be32_to_cpu(cm_id_priv->rq_psn);

2
drivers/infiniband/core/cma.c
View file

@ -4313,6 +4313,8 @@ static int cma_connect_ib(struct rdma_id_private *id_priv,
}
req.primary_path = &route->path_rec[0];
req.primary_path_inbound = route->path_rec_inbound;
req.primary_path_outbound = route->path_rec_outbound;
if (route->num_pri_alt_paths == 2)
req.alternate_path = &route->path_rec[1];

2
include/rdma/ib_cm.h
View file

@ -348,6 +348,8 @@ struct ib_cm_id *ib_cm_insert_listen(struct ib_device *device,
struct ib_cm_req_param {
struct sa_path_rec *primary_path;
struct sa_path_rec *primary_path_inbound;
struct sa_path_rec *primary_path_outbound;
struct sa_path_rec *alternate_path;
const struct ib_gid_attr *ppath_sgid_attr;
__be64 service_id;