diff options
| author |   Gioh Kim <gi-oh.kim@cloud.ionos.com> | 2021-04-19 09:37:16 +0200 |
|---|---|---|
| committer |   Jens Axboe <axboe@kernel.dk> | 2021-04-20 08:59:04 -0600 |
| commit | 2958a995edc94654df690318df7b9b49e5a3ef88 (patch) | |
| tree | fddb6e4b38e52bfcc2a984940fa0b65e61292252 /drivers/infiniband/ulp/rtrs/rtrs.h | |
| parent | block/rnbd-clt: Fix missing a memory free when unloading the module (diff) | |
| download | wireguard-linux-2958a995edc94654df690318df7b9b49e5a3ef88.tar.xz wireguard-linux-2958a995edc94654df690318df7b9b49e5a3ef88.zip | |
block/rnbd-clt: Support polling mode for IO latency optimization
RNBD can make double-queues for irq-mode and poll-mode.
For example, on 4-CPU system 8 request-queues are created,
4 for irq-mode and 4 for poll-mode.
If the IO has HIPRI flag, the block-layer will call .poll function
of RNBD. Then IO is sent to the poll-mode queue.
Add optional nr_poll_queues argument for map_devices interface.
To support polling of RNBD, RTRS client creates connections
for both of irq-mode and direct-poll-mode.
For example, on 4-CPU system it could've create 5 connections:
con[0] => user message (softirq cq)
con[1:4] => softirq cq
After this patch, it can create 9 connections:
con[0] => user message (softirq cq)
con[1:4] => softirq cq
con[5:8] => DIRECT-POLL cq
Cc: Leon Romanovsky <leonro@nvidia.com>
Cc: linux-rdma@vger.kernel.org
Signed-off-by: Gioh Kim <gi-oh.kim@ionos.com>
Signed-off-by: Jack Wang <jinpu.wang@ionos.com>
Acked-by: Jason Gunthorpe <jgg@nvidia.com>
Reviewed-by: Leon Romanovsky <leonro@nvidia.com>
Link: https://lore.kernel.org/r/20210419073722.15351-14-gi-oh.kim@ionos.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'drivers/infiniband/ulp/rtrs/rtrs.h')
| -rw-r--r-- | drivers/infiniband/ulp/rtrs/rtrs.h | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/infiniband/ulp/rtrs/rtrs.h b/drivers/infiniband/ulp/rtrs/rtrs.h index 2db1b5eb3ab0..f891fbe7abe6 100644 --- a/drivers/infiniband/ulp/rtrs/rtrs.h +++ b/drivers/infiniband/ulp/rtrs/rtrs.h @@ -59,7 +59,7 @@ struct rtrs_clt *rtrs_clt_open(struct rtrs_clt_ops *ops, size_t pdu_sz, u8 reconnect_delay_sec, u16 max_segments, size_t max_segment_size, - s16 max_reconnect_attempts); + s16 max_reconnect_attempts, u32 nr_poll_queues); void rtrs_clt_close(struct rtrs_clt *sess); @@ -103,6 +103,7 @@ int rtrs_clt_request(int dir, struct rtrs_clt_req_ops *ops, struct rtrs_clt *sess, struct rtrs_permit *permit, const struct kvec *vec, size_t nr, size_t len, struct scatterlist *sg, unsigned int sg_cnt); +int rtrs_clt_rdma_cq_direct(struct rtrs_clt *clt, unsigned int index); /** * rtrs_attrs - RTRS session attributes |