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authorYonatan Cohen <yonatanc@mellanox.com>2017-11-13 11:51:13 +0300
committerDoug Ledford <dledford@redhat.com>2017-11-14 00:59:22 +0300
commit869ddcf8b351ace5bf8860f3cd6265dccb382426 (patch)
tree52e0134b73d34d90a96c6a0c036c8ca8da0fc4ed /drivers/infiniband
parentbc52e9ca74b9a395897bb640c6671b2cbf716032 (diff)
downloadlinux-869ddcf8b351ace5bf8860f3cd6265dccb382426.tar.xz
IB/uverbs: Allow CQ moderation with modify CQ
Uverbs support in modify_cq for CQ moderation only. Gives ability to change cq_max_count and cq_period. CQ moderation enhance performance by moderating the number of CQEs needed to create an event instead of application having to suffer from event per-CQE. To achieve CQ moderation the application needs to set cq_max_count and cq_period. cq_max_count - defines the number of CQEs needed to create an event. cq_period - defines the timeout (micro seconds) between last event and a new one that will occur even if cq_max_count was not satisfied Signed-off-by: Yonatan Cohen <yonatanc@mellanox.com> Reviewed-by: Majd Dibbiny <majd@mellanox.com> Signed-off-by: Leon Romanovsky <leon@kernel.org> Signed-off-by: Doug Ledford <dledford@redhat.com>
Diffstat (limited to 'drivers/infiniband')
-rw-r--r--drivers/infiniband/core/uverbs.h1
-rw-r--r--drivers/infiniband/core/uverbs_cmd.c42
-rw-r--r--drivers/infiniband/core/uverbs_main.c1
3 files changed, 44 insertions, 0 deletions
diff --git a/drivers/infiniband/core/uverbs.h b/drivers/infiniband/core/uverbs.h
index ee2739ae4305..deccefb71a6b 100644
--- a/drivers/infiniband/core/uverbs.h
+++ b/drivers/infiniband/core/uverbs.h
@@ -306,5 +306,6 @@ IB_UVERBS_DECLARE_EX_CMD(destroy_wq);
IB_UVERBS_DECLARE_EX_CMD(create_rwq_ind_table);
IB_UVERBS_DECLARE_EX_CMD(destroy_rwq_ind_table);
IB_UVERBS_DECLARE_EX_CMD(modify_qp);
+IB_UVERBS_DECLARE_EX_CMD(modify_cq);
#endif /* UVERBS_H */
diff --git a/drivers/infiniband/core/uverbs_cmd.c b/drivers/infiniband/core/uverbs_cmd.c
index 8ca36843ef38..3c2673cd4090 100644
--- a/drivers/infiniband/core/uverbs_cmd.c
+++ b/drivers/infiniband/core/uverbs_cmd.c
@@ -3856,3 +3856,45 @@ end:
err = ib_copy_to_udata(ucore, &resp, resp.response_length);
return err;
}
+
+int ib_uverbs_ex_modify_cq(struct ib_uverbs_file *file,
+ struct ib_device *ib_dev,
+ struct ib_udata *ucore,
+ struct ib_udata *uhw)
+{
+ struct ib_uverbs_ex_modify_cq cmd = {};
+ struct ib_cq *cq;
+ size_t required_cmd_sz;
+ int ret;
+
+ required_cmd_sz = offsetof(typeof(cmd), reserved) +
+ sizeof(cmd.reserved);
+ if (ucore->inlen < required_cmd_sz)
+ return -EINVAL;
+
+ /* sanity checks */
+ if (ucore->inlen > sizeof(cmd) &&
+ !ib_is_udata_cleared(ucore, sizeof(cmd),
+ ucore->inlen - sizeof(cmd)))
+ return -EOPNOTSUPP;
+
+ ret = ib_copy_from_udata(&cmd, ucore, min(sizeof(cmd), ucore->inlen));
+ if (ret)
+ return ret;
+
+ if (!cmd.attr_mask || cmd.reserved)
+ return -EINVAL;
+
+ if (cmd.attr_mask > IB_CQ_MODERATE)
+ return -EOPNOTSUPP;
+
+ cq = uobj_get_obj_read(cq, cmd.cq_handle, file->ucontext);
+ if (!cq)
+ return -EINVAL;
+
+ ret = ib_modify_cq(cq, cmd.attr.cq_count, cmd.attr.cq_period);
+
+ uobj_put_obj_read(cq);
+
+ return ret;
+}
diff --git a/drivers/infiniband/core/uverbs_main.c b/drivers/infiniband/core/uverbs_main.c
index b5febfd84ee5..381fd9c096ae 100644
--- a/drivers/infiniband/core/uverbs_main.c
+++ b/drivers/infiniband/core/uverbs_main.c
@@ -128,6 +128,7 @@ static int (*uverbs_ex_cmd_table[])(struct ib_uverbs_file *file,
[IB_USER_VERBS_EX_CMD_CREATE_RWQ_IND_TBL] = ib_uverbs_ex_create_rwq_ind_table,
[IB_USER_VERBS_EX_CMD_DESTROY_RWQ_IND_TBL] = ib_uverbs_ex_destroy_rwq_ind_table,
[IB_USER_VERBS_EX_CMD_MODIFY_QP] = ib_uverbs_ex_modify_qp,
+ [IB_USER_VERBS_EX_CMD_MODIFY_CQ] = ib_uverbs_ex_modify_cq,
};
static void ib_uverbs_add_one(struct ib_device *device);