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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 <[email protected]>
Reviewed-by: Majd Dibbiny <[email protected]>
Signed-off-by: Leon Romanovsky <[email protected]>
Signed-off-by: Doug Ledford <[email protected]>
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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1
drivers/infiniband/core/uverbs.h
View file

@ -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 */

42
drivers/infiniband/core/uverbs_cmd.c
View file

@ -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;
}

1
drivers/infiniband/core/uverbs_main.c
View file

@ -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);