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block/rnbd-clt: Does not request pdu to rtrs-clt 

Previously the rnbd client requested the rtrs to allocate rnbd_iu
just after the rtrs_iu. So the rnbd client passes the size of
rnbd_iu for rtrs_clt_open() and rtrs creates an array of
rnbd_iu and rtrs_iu.

For IO handling, rnbd_iu exists after the request because we pass
the size of rnbd_iu when setting the tag-set. Therefore we do not
use the rnbd_iu allocated by rtrs for IO handling.
We only use the rnbd_iu allocated by rtrs when doing session
initialization. Almost all rnbd_iu allocated by rtrs are wasted.

By this patch the rnbd client does not request rnbd_iu allocation
to rtrs but allocate it for itself when doing session initialization.

Also remove unused rtrs_permit_to_pdu from rtrs.

Signed-off-by: Gioh Kim <gi-oh.kim@cloud.ionos.com>
Signed-off-by: Jack Wang <jinpu.wang@cloud.ionos.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Gioh Kim 2020-12-10 11:18:26 +01:00 committed by Jens Axboe
parent 5a1328d0c3
commit 9aaf9a2aba
3 changed files with 13 additions and 17 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

17
drivers/block/rnbd/rnbd-clt.c
View File

@ -349,12 +349,19 @@ static struct rnbd_iu *rnbd_get_iu(struct rnbd_clt_session *sess,
struct rnbd_iu *iu;
struct rtrs_permit *permit;
iu = kzalloc(sizeof(*iu), GFP_KERNEL);
if (!iu) {
return NULL;
}
permit = rnbd_get_permit(sess, con_type,
wait ? RTRS_PERMIT_WAIT :
RTRS_PERMIT_NOWAIT);
if (unlikely(!permit))
if (unlikely(!permit)) {
kfree(iu);
return NULL;
iu = rtrs_permit_to_pdu(permit);
}
iu->permit = permit;
/*
* 1st reference is dropped after finishing sending a "user" message,
@ -373,8 +380,10 @@ static struct rnbd_iu *rnbd_get_iu(struct rnbd_clt_session *sess,
static void rnbd_put_iu(struct rnbd_clt_session *sess, struct rnbd_iu *iu)
{
if (atomic_dec_and_test(&iu->refcount))
if (atomic_dec_and_test(&iu->refcount)) {
rnbd_put_permit(sess, iu->permit);
kfree(iu);
}
}
static void rnbd_softirq_done_fn(struct request *rq)
@ -1218,7 +1227,7 @@ find_and_get_or_create_sess(const char *sessname,
*/
sess->rtrs = rtrs_clt_open(&rtrs_ops, sessname,
paths, path_cnt, port_nr,
sizeof(struct rnbd_iu),
0, /* Do not use pdu of rtrs */
RECONNECT_DELAY, BMAX_SEGMENTS,
BLK_MAX_SEGMENT_SIZE,
MAX_RECONNECTS);

6
drivers/infiniband/ulp/rtrs/rtrs-clt.c
View File

@ -157,12 +157,6 @@ void rtrs_clt_put_permit(struct rtrs_clt *clt, struct rtrs_permit *permit)
}
EXPORT_SYMBOL(rtrs_clt_put_permit);
void *rtrs_permit_to_pdu(struct rtrs_permit *permit)
{
return permit + 1;
}
EXPORT_SYMBOL(rtrs_permit_to_pdu);
/**
* rtrs_permit_to_clt_con() - returns RDMA connection pointer by the permit
* @sess: client session pointer

7
drivers/infiniband/ulp/rtrs/rtrs.h
View File

@ -63,13 +63,6 @@ struct rtrs_clt *rtrs_clt_open(struct rtrs_clt_ops *ops,
void rtrs_clt_close(struct rtrs_clt *sess);
/**
* rtrs_permit_to_pdu() - converts rtrs_permit to opaque pdu pointer
* @permit: RTRS permit pointer, it associates the memory allocation for future
* RDMA operation.
*/
void *rtrs_permit_to_pdu(struct rtrs_permit *permit);
enum {
RTRS_PERMIT_NOWAIT = 0,
RTRS_PERMIT_WAIT = 1,