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Tue, 08 Sep 2026 08:45:24 -0700 (PDT) From: Ammar Ratnani To: linux-rdma@vger.kernel.org Cc: Ammar Ratnani , Ammar Ratnani , Kechen Lu , Mithun Maragiri , linux-kernel@vger.kernel.org, Leon Romanovsky , Jason Gunthorpe , Namjae Jeon , Paulo Alcantara , Stefan Metzmacher , Tom Talpey , linux-cifs@vger.kernel.org, samba-technical@lists.samba.org Subject: [PATCH 1/2] infiniband: force disconnect if DREP and DREQ fail Date: Tue, 8 Sep 2026 08:44:26 -0700 Message-ID: <20260908154454.10966-2-ammrat13@gmail.com> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260908154454.10966-1-ammrat13@gmail.com> References: <20260908154454.10966-1-ammrat13@gmail.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" When we call `rdma_disconnect`, it's possible that we fail to send both a DREQ and a DREP. In that case, we currently either do nothing or move into the `IB_CM_TIMEWAIT` state. Either way, we remain in the `RDMA_CM_CONNECT` state. Anyone waiting for us to disconnect hangs. Instead, while we're connected, when we call `rdma_disconnect`, and fail to send both a DREQ and a DREP, mark the connection as disconnected. Call the upper layer's handler for the disconnect, and destroy the connection if instructed. Cc: Leon Romanovsky Cc: Jason Gunthorpe Cc: Namjae Jeon Cc: Paulo Alcantara Cc: Stefan Metzmacher Cc: Tom Talpey Cc: linux-rdma@vger.kernel.org Cc: linux-cifs@vger.kernel.org Cc: samba-technical@lists.samba.org Cc: linux-kernel@vger.kernel.org Signed-off-by: Ammar Ratnani --- drivers/infiniband/core/cma.c | 39 +++++++++++++++++++++++++++++++---- 1 file changed, 35 insertions(+), 4 deletions(-) diff --git a/drivers/infiniband/core/cma.c b/drivers/infiniband/core/cma.c index 73170b15fc3d..1f1a8b4e160a 100644 --- a/drivers/infiniband/core/cma.c +++ b/drivers/infiniband/core/cma.c @@ -4823,6 +4823,34 @@ int rdma_reject(struct rdma_cm_id *id, const void *p= rivate_data, } EXPORT_SYMBOL(rdma_reject); =20 +/* + * Called from rdma_disconnect() when we know we're not receiving a callba= ck. + * Emulate what that callback (in cma_ib_handler()) would have done. + * + * NOTE: Despite the name, this function will only actually disconnect when + * we're in the RDMA_CM_CONNECT state. Else, it does nothing. + */ +static int cma_force_disconnect(struct rdma_id_private *id_priv) +{ + struct cma_work *work; + + work =3D kzalloc_obj(*work); + if (!work) + return -ENOMEM; + + INIT_WORK(&work->work, cma_work_handler); + work->old_state =3D RDMA_CM_CONNECT; + work->new_state =3D RDMA_CM_DISCONNECT; + work->event.event =3D RDMA_CM_EVENT_DISCONNECTED; + work->event.status =3D -ECONNABORTED; + + cma_id_get(id_priv); + work->id =3D id_priv; + + queue_work(cma_wq, &work->work); + return 0; +} + int rdma_disconnect(struct rdma_cm_id *id) { struct rdma_id_private *id_priv; @@ -4838,12 +4866,15 @@ int rdma_disconnect(struct rdma_cm_id *id) goto out; /* Initiate or respond to a disconnect. */ trace_cm_disconnect(id_priv); - if (ib_send_cm_dreq(id_priv->cm_id.ib, NULL, 0)) { - if (!ib_send_cm_drep(id_priv->cm_id.ib, NULL, 0)) - trace_cm_sent_drep(id_priv); - } else { + if (!ib_send_cm_dreq(id_priv->cm_id.ib, NULL, 0)) { trace_cm_sent_dreq(id_priv); + goto out; + } + if (!ib_send_cm_drep(id_priv->cm_id.ib, NULL, 0)) { + trace_cm_sent_drep(id_priv); 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charset="utf-8" When we failed to send both a DREQ and a DREP, we have to infer that by noting the absence of the `sent_dreq` and `sent_drep` trace events. It would be better if we could see this case by the presence of a trace event instead. Implement that. Cc: Leon Romanovsky Cc: Jason Gunthorpe Cc: Namjae Jeon Cc: Paulo Alcantara Cc: Stefan Metzmacher Cc: Tom Talpey Cc: linux-rdma@vger.kernel.org Cc: linux-cifs@vger.kernel.org Cc: samba-technical@lists.samba.org Cc: linux-kernel@vger.kernel.org Signed-off-by: Ammar Ratnani --- drivers/infiniband/core/cma.c | 2 ++ drivers/infiniband/core/cma_trace.h | 1 + 2 files changed, 3 insertions(+) diff --git a/drivers/infiniband/core/cma.c b/drivers/infiniband/core/cma.c index 1f1a8b4e160a..c4eab48a4a9f 100644 --- a/drivers/infiniband/core/cma.c +++ b/drivers/infiniband/core/cma.c @@ -4834,6 +4834,8 @@ static int cma_force_disconnect(struct rdma_id_privat= e *id_priv) { struct cma_work *work; =20 + trace_cm_force_disconnect(id_priv); + work =3D kzalloc_obj(*work); if (!work) return -ENOMEM; diff --git a/drivers/infiniband/core/cma_trace.h b/drivers/infiniband/core/= cma_trace.h index 3456d5f3aa47..3d05d8e80856 100644 --- a/drivers/infiniband/core/cma_trace.h +++ b/drivers/infiniband/core/cma_trace.h @@ -61,6 +61,7 @@ DEFINE_CMA_FSM_EVENT(send_sidr_rep); DEFINE_CMA_FSM_EVENT(disconnect); DEFINE_CMA_FSM_EVENT(sent_drep); DEFINE_CMA_FSM_EVENT(sent_dreq); +DEFINE_CMA_FSM_EVENT(force_disconnect); DEFINE_CMA_FSM_EVENT(id_destroy); =20 TRACE_EVENT(cm_id_attach, --=20 2.55.0