This is a note to let you know that I've just added the patch titled
RDMA/rdmavt: Decouple QP and SGE lists allocations
to the 5.10-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
rdma-rdmavt-decouple-qp-and-sge-lists-allocations.patch
and it can be found in the queue-5.10 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit c9869aacea83c0fd66a5d3861130dfbf57d30b73
Author: Leon Romanovsky <leonro@xxxxxxxxxx>
Date: Fri Jul 23 14:39:49 2021 +0300
RDMA/rdmavt: Decouple QP and SGE lists allocations
[ Upstream commit 44da3730e046a784d088157175d9418ba60661fc ]
The rdmavt QP has fields that are both needed for the control and data
path. Such mixed declaration caused to the very specific allocation flow
with kzalloc_node and SGE list embedded into the struct rvt_qp.
This patch separates QP creation to two: regular memory allocation for the
control path and specific code for the SGE list, while the access to the
later is performed through derefenced pointer.
Such pointer and its context are expected to be in the cache, so
performance difference is expected to be negligible, if any exists.
Link: https://lore.kernel.org/r/f66c1e20ccefba0db3c69c58ca9c897f062b4d1c.1627040189.git.leonro@xxxxxxxxxx
Signed-off-by: Leon Romanovsky <leonro@xxxxxxxxxx>
Signed-off-by: Jason Gunthorpe <jgg@xxxxxxxxxx>
Stable-dep-of: a3c278807a45 ("RDMA/siw: Fix QP destroy to wait for all references dropped.")
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/infiniband/sw/rdmavt/qp.c b/drivers/infiniband/sw/rdmavt/qp.c
index 585a9c76e518..5d300f25ef87 100644
--- a/drivers/infiniband/sw/rdmavt/qp.c
+++ b/drivers/infiniband/sw/rdmavt/qp.c
@@ -1073,7 +1073,7 @@ struct ib_qp *rvt_create_qp(struct ib_pd *ibpd,
int err;
struct rvt_swqe *swq = NULL;
size_t sz;
- size_t sg_list_sz;
+ size_t sg_list_sz = 0;
struct ib_qp *ret = ERR_PTR(-ENOMEM);
struct rvt_dev_info *rdi = ib_to_rvt(ibpd->device);
void *priv = NULL;
@@ -1120,8 +1120,6 @@ struct ib_qp *rvt_create_qp(struct ib_pd *ibpd,
if (!swq)
return ERR_PTR(-ENOMEM);
- sz = sizeof(*qp);
- sg_list_sz = 0;
if (init_attr->srq) {
struct rvt_srq *srq = ibsrq_to_rvtsrq(init_attr->srq);
@@ -1131,10 +1129,13 @@ struct ib_qp *rvt_create_qp(struct ib_pd *ibpd,
} else if (init_attr->cap.max_recv_sge > 1)
sg_list_sz = sizeof(*qp->r_sg_list) *
(init_attr->cap.max_recv_sge - 1);
- qp = kzalloc_node(sz + sg_list_sz, GFP_KERNEL,
- rdi->dparms.node);
+ qp = kzalloc_node(sizeof(*qp), GFP_KERNEL, rdi->dparms.node);
if (!qp)
goto bail_swq;
+ qp->r_sg_list =
+ kzalloc_node(sg_list_sz, GFP_KERNEL, rdi->dparms.node);
+ if (!qp->r_sg_list)
+ goto bail_qp;
qp->allowed_ops = get_allowed_ops(init_attr->qp_type);
RCU_INIT_POINTER(qp->next, NULL);
@@ -1322,6 +1323,7 @@ struct ib_qp *rvt_create_qp(struct ib_pd *ibpd,
bail_qp:
kfree(qp->s_ack_queue);
+ kfree(qp->r_sg_list);
kfree(qp);
bail_swq:
@@ -1752,6 +1754,7 @@ int rvt_destroy_qp(struct ib_qp *ibqp, struct ib_udata *udata)
kvfree(qp->r_rq.kwq);
rdi->driver_f.qp_priv_free(rdi, qp);
kfree(qp->s_ack_queue);
+ kfree(qp->r_sg_list);
rdma_destroy_ah_attr(&qp->remote_ah_attr);
rdma_destroy_ah_attr(&qp->alt_ah_attr);
free_ud_wq_attr(qp);
diff --git a/include/rdma/rdmavt_qp.h b/include/rdma/rdmavt_qp.h
index 8275954f5ce6..2e58d5e6ac0e 100644
--- a/include/rdma/rdmavt_qp.h
+++ b/include/rdma/rdmavt_qp.h
@@ -444,7 +444,7 @@ struct rvt_qp {
/*
* This sge list MUST be last. Do not add anything below here.
*/
- struct rvt_sge r_sg_list[] /* verified SGEs */
+ struct rvt_sge *r_sg_list /* verified SGEs */
____cacheline_aligned_in_smp;
};
