summaryrefslogtreecommitdiffstats
path: root/net
diff options
context:
space:
mode:
authorSantosh Shilimkar <santosh.shilimkar@oracle.com>2016-02-18 20:06:47 -0800
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2017-10-08 10:14:16 +0200
commit6a501bddeba3406517e0ba3529d9a665709df4a1 (patch)
treeb5344840ac61780e9928f1fea5d6eebf27e1ded8 /net
parentd4f97441cb888cf53b88f38ac0dc6bbe3a044910 (diff)
downloadlinux-stable-6a501bddeba3406517e0ba3529d9a665709df4a1.tar.gz
linux-stable-6a501bddeba3406517e0ba3529d9a665709df4a1.tar.bz2
linux-stable-6a501bddeba3406517e0ba3529d9a665709df4a1.zip
RDS: RDMA: Fix the composite message user notification
[ Upstream commit 941f8d55f6d613a460a5e080d25a38509f45eb75 ] When application sends an RDS RDMA composite message consist of RDMA transfer to be followed up by non RDMA payload, it expect to be notified *only* when the full message gets delivered. RDS RDMA notification doesn't behave this way though. Thanks to Venkat for debug and root casuing the issue where only first part of the message(RDMA) was successfully delivered but remainder payload delivery failed. In that case, application should not be notified with a false positive of message delivery success. Fix this case by making sure the user gets notified only after the full message delivery. Reviewed-by: Venkat Venkatsubra <venkat.x.venkatsubra@oracle.com> Signed-off-by: Santosh Shilimkar <santosh.shilimkar@oracle.com> Signed-off-by: Sasha Levin <alexander.levin@verizon.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'net')
-rw-r--r--net/rds/ib_send.c25
-rw-r--r--net/rds/rdma.c10
-rw-r--r--net/rds/rds.h1
-rw-r--r--net/rds/send.c4
4 files changed, 29 insertions, 11 deletions
diff --git a/net/rds/ib_send.c b/net/rds/ib_send.c
index eac30bf486d7..094e2a12860a 100644
--- a/net/rds/ib_send.c
+++ b/net/rds/ib_send.c
@@ -68,16 +68,6 @@ static void rds_ib_send_complete(struct rds_message *rm,
complete(rm, notify_status);
}
-static void rds_ib_send_unmap_data(struct rds_ib_connection *ic,
- struct rm_data_op *op,
- int wc_status)
-{
- if (op->op_nents)
- ib_dma_unmap_sg(ic->i_cm_id->device,
- op->op_sg, op->op_nents,
- DMA_TO_DEVICE);
-}
-
static void rds_ib_send_unmap_rdma(struct rds_ib_connection *ic,
struct rm_rdma_op *op,
int wc_status)
@@ -138,6 +128,21 @@ static void rds_ib_send_unmap_atomic(struct rds_ib_connection *ic,
rds_ib_stats_inc(s_ib_atomic_fadd);
}
+static void rds_ib_send_unmap_data(struct rds_ib_connection *ic,
+ struct rm_data_op *op,
+ int wc_status)
+{
+ struct rds_message *rm = container_of(op, struct rds_message, data);
+
+ if (op->op_nents)
+ ib_dma_unmap_sg(ic->i_cm_id->device,
+ op->op_sg, op->op_nents,
+ DMA_TO_DEVICE);
+
+ if (rm->rdma.op_active && rm->data.op_notify)
+ rds_ib_send_unmap_rdma(ic, &rm->rdma, wc_status);
+}
+
/*
* Unmap the resources associated with a struct send_work.
*
diff --git a/net/rds/rdma.c b/net/rds/rdma.c
index 4c93badeabf2..8d3a851a3476 100644
--- a/net/rds/rdma.c
+++ b/net/rds/rdma.c
@@ -626,6 +626,16 @@ int rds_cmsg_rdma_args(struct rds_sock *rs, struct rds_message *rm,
}
op->op_notifier->n_user_token = args->user_token;
op->op_notifier->n_status = RDS_RDMA_SUCCESS;
+
+ /* Enable rmda notification on data operation for composite
+ * rds messages and make sure notification is enabled only
+ * for the data operation which follows it so that application
+ * gets notified only after full message gets delivered.
+ */
+ if (rm->data.op_sg) {
+ rm->rdma.op_notify = 0;
+ rm->data.op_notify = !!(args->flags & RDS_RDMA_NOTIFY_ME);
+ }
}
/* The cookie contains the R_Key of the remote memory region, and
diff --git a/net/rds/rds.h b/net/rds/rds.h
index 0e2797bdc316..4588860f4c3b 100644
--- a/net/rds/rds.h
+++ b/net/rds/rds.h
@@ -378,6 +378,7 @@ struct rds_message {
} rdma;
struct rm_data_op {
unsigned int op_active:1;
+ unsigned int op_notify:1;
unsigned int op_nents;
unsigned int op_count;
unsigned int op_dmasg;
diff --git a/net/rds/send.c b/net/rds/send.c
index c9cdb358ea88..6815f03324d7 100644
--- a/net/rds/send.c
+++ b/net/rds/send.c
@@ -467,12 +467,14 @@ void rds_rdma_send_complete(struct rds_message *rm, int status)
struct rm_rdma_op *ro;
struct rds_notifier *notifier;
unsigned long flags;
+ unsigned int notify = 0;
spin_lock_irqsave(&rm->m_rs_lock, flags);
+ notify = rm->rdma.op_notify | rm->data.op_notify;
ro = &rm->rdma;
if (test_bit(RDS_MSG_ON_SOCK, &rm->m_flags) &&
- ro->op_active && ro->op_notify && ro->op_notifier) {
+ ro->op_active && notify && ro->op_notifier) {
notifier = ro->op_notifier;
rs = rm->m_rs;
sock_hold(rds_rs_to_sk(rs));