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IB/uverbs: Allow CQ moderation with modify CQ

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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>
This commit is contained in:
Yonatan Cohen 2017-11-13 10:51:13 +02:00 • committed by Doug Ledford
commit 869ddcf8b3
5 changed files with 62 additions and 1 deletions
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15
include/uapi/rdma/ib_user_verbs.h
View file

@ -100,7 +100,8 @@ enum {
IB_USER_VERBS_EX_CMD_MODIFY_WQ,
IB_USER_VERBS_EX_CMD_DESTROY_WQ,
IB_USER_VERBS_EX_CMD_CREATE_RWQ_IND_TBL,
IB_USER_VERBS_EX_CMD_DESTROY_RWQ_IND_TBL
IB_USER_VERBS_EX_CMD_DESTROY_RWQ_IND_TBL,
IB_USER_VERBS_EX_CMD_MODIFY_CQ
};
/*
@ -1150,6 +1151,18 @@ struct ib_uverbs_ex_destroy_rwq_ind_table {
__u32 ind_tbl_handle;
};
struct ib_uverbs_cq_moderation {
__u16 cq_count;
__u16 cq_period;
};
struct ib_uverbs_ex_modify_cq {
__u32 cq_handle;
__u32 attr_mask;
struct ib_uverbs_cq_moderation attr;
__u32 reserved;
};
#define IB_DEVICE_NAME_MAX 64
#endif /* IB_USER_VERBS_H */