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From: Ming Lei <[email protected]>
To: Jens Axboe <[email protected]>,
	[email protected], [email protected]
Cc: [email protected],
	Miklos Szeredi <[email protected]>,
	ZiyangZhang <[email protected]>,
	Xiaoguang Wang <[email protected]>,
	Bernd Schubert <[email protected]>,
	Pavel Begunkov <[email protected]>,
	Stefan Hajnoczi <[email protected]>,
	Ming Lei <[email protected]>
Subject: [PATCH V4 16/17] block: ublk_drv: don't check buffer in case of zero copy
Date: Fri, 24 Mar 2023 21:58:07 +0800	[thread overview]
Message-ID: <[email protected]> (raw)
In-Reply-To: <[email protected]>

In case of zero copy, ublk server needn't to pre-allocate IO buffer
and provide it to driver more.

Meantime not set the buffer in case of zero copy any more, and the
userspace can use pread()/pwrite() to read from/write to the io request
buffer, which is easier & simpler from userspace viewpoint.

Signed-off-by: Ming Lei <[email protected]>
---
 drivers/block/ublk_drv.c | 23 ++++++++++++++---------
 1 file changed, 14 insertions(+), 9 deletions(-)

diff --git a/drivers/block/ublk_drv.c b/drivers/block/ublk_drv.c
index e6b528750b3c..979444647831 100644
--- a/drivers/block/ublk_drv.c
+++ b/drivers/block/ublk_drv.c
@@ -1405,25 +1405,30 @@ static int ublk_ch_uring_cmd(struct io_uring_cmd *cmd, unsigned int issue_flags)
 		if (io->flags & UBLK_IO_FLAG_OWNED_BY_SRV)
 			goto out;
 		/* FETCH_RQ has to provide IO buffer if NEED GET DATA is not enabled */
-		if (!ub_cmd->addr && !ublk_need_get_data(ubq))
-			goto out;
+		if (!ublk_support_zc(ubq)) {
+			if (!ub_cmd->addr && !ublk_need_get_data(ubq))
+				goto out;
+			io->addr = ub_cmd->addr;
+		}
 		io->cmd = cmd;
 		io->flags |= UBLK_IO_FLAG_ACTIVE;
-		io->addr = ub_cmd->addr;
-
 		ublk_mark_io_ready(ub, ubq);
 		break;
 	case UBLK_IO_COMMIT_AND_FETCH_REQ:
 		req = blk_mq_tag_to_rq(ub->tag_set.tags[ub_cmd->q_id], tag);
+
+		if (!(io->flags & UBLK_IO_FLAG_OWNED_BY_SRV))
+			goto out;
 		/*
 		 * COMMIT_AND_FETCH_REQ has to provide IO buffer if NEED GET DATA is
 		 * not enabled or it is Read IO.
 		 */
-		if (!ub_cmd->addr && (!ublk_need_get_data(ubq) || req_op(req) == REQ_OP_READ))
-			goto out;
-		if (!(io->flags & UBLK_IO_FLAG_OWNED_BY_SRV))
-			goto out;
-		io->addr = ub_cmd->addr;
+		if (!ublk_support_zc(ubq)) {
+			if (!ub_cmd->addr && (!ublk_need_get_data(ubq) ||
+						req_op(req) == REQ_OP_READ))
+				goto out;
+			io->addr = ub_cmd->addr;
+		}
 		io->flags |= UBLK_IO_FLAG_ACTIVE;
 		io->cmd = cmd;
 		ublk_commit_completion(ub, ub_cmd);
-- 
2.39.2


  parent reply	other threads:[~2023-03-24 14:01 UTC|newest]

Thread overview: 28+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <CGME20230324135916epcas5p37aad4c49c76c05567a484377d8909092@epcas5p3.samsung.com>
2023-03-24 13:57 ` [PATCH V4 00/17] io_uring/ublk: add IORING_OP_FUSED_CMD Ming Lei
2023-03-24 13:57   ` [PATCH V4 01/17] io_uring: increase io_kiocb->flags into 64bit Ming Lei
2023-03-24 13:57   ` [PATCH V4 02/17] io_uring: add IORING_OP_FUSED_CMD Ming Lei
2023-03-24 13:57   ` [PATCH V4 03/17] io_uring: support normal SQE for fused command Ming Lei
2023-03-24 13:57   ` [PATCH V4 04/17] io_uring: support OP_READ/OP_WRITE for fused slave request Ming Lei
2023-03-24 13:57   ` [PATCH V4 05/17] io_uring: support OP_SEND_ZC/OP_RECV " Ming Lei
2023-03-24 13:57   ` [PATCH V4 06/17] block: ublk_drv: mark device as LIVE before adding disk Ming Lei
2023-03-24 13:57   ` [PATCH V4 07/17] block: ublk_drv: add common exit handling Ming Lei
2023-03-24 13:57   ` [PATCH V4 08/17] block: ublk_drv: don't consider flush request in map/unmap io Ming Lei
2023-03-24 13:58   ` [PATCH V4 09/17] block: ublk_drv: add two helpers to clean up map/unmap request Ming Lei
2023-03-24 13:58   ` [PATCH V4 10/17] block: ublk_drv: clean up several helpers Ming Lei
2023-03-24 13:58   ` [PATCH V4 11/17] block: ublk_drv: cleanup 'struct ublk_map_data' Ming Lei
2023-03-24 13:58   ` [PATCH V4 12/17] block: ublk_drv: cleanup ublk_copy_user_pages Ming Lei
2023-03-24 13:58   ` [PATCH V4 13/17] block: ublk_drv: grab request reference when the request is handled by userspace Ming Lei
2023-03-24 13:58   ` [PATCH V4 14/17] block: ublk_drv: support to copy any part of request pages Ming Lei
2023-03-24 13:58   ` [PATCH V4 15/17] block: ublk_drv: add read()/write() support for ublk char device Ming Lei
2023-03-24 13:58   ` Ming Lei [this message]
2023-03-24 13:58   ` [PATCH V4 17/17] block: ublk_drv: apply io_uring FUSED_CMD for supporting zero copy Ming Lei
2023-03-28  0:36   ` [PATCH V4 00/17] io_uring/ublk: add IORING_OP_FUSED_CMD Dan Williams
2023-03-28  1:16     ` Ming Lei
2023-03-28  1:29       ` Jens Axboe
2023-03-28  1:35         ` Ming Lei
2023-03-28  1:31       ` Dan Williams
2023-03-28  2:02         ` Ming Lei
2023-03-28  6:32           ` Dan Williams
2023-03-28  3:13       ` Gao Xiang
2023-03-28  3:33         ` Ming Lei
2023-03-28  5:10   ` Kanchan Joshi

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