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From: Kanchan Joshi <[email protected]>
To: [email protected], [email protected], [email protected], [email protected]
Cc: [email protected], [email protected],
	[email protected], [email protected],
	[email protected], [email protected], [email protected],
	Kanchan Joshi <[email protected]>
Subject: [PATCH for-next 3/4] io_uring: grow a field in struct io_uring_cmd
Date: Mon, 11 Jul 2022 16:31:54 +0530	[thread overview]
Message-ID: <[email protected]> (raw)
In-Reply-To: <[email protected]>

Use the leftover space to carve 'next' field that enables linking of
io_uring_cmd structs. Also introduce a list head and few helpers.

This is in preparation to support nvme-mulitpath, allowing multiple
uring passthrough commands to be queued.

Signed-off-by: Kanchan Joshi <[email protected]>
Signed-off-by: Anuj Gupta <[email protected]>
---
 include/linux/io_uring.h | 38 ++++++++++++++++++++++++++++++++++++--
 1 file changed, 36 insertions(+), 2 deletions(-)

diff --git a/include/linux/io_uring.h b/include/linux/io_uring.h
index 54063d67506b..d734599cbcd7 100644
--- a/include/linux/io_uring.h
+++ b/include/linux/io_uring.h
@@ -22,9 +22,14 @@ struct io_uring_cmd {
 	const void	*cmd;
 	/* callback to defer completions to task context */
 	void (*task_work_cb)(struct io_uring_cmd *cmd);
+	struct io_uring_cmd	*next;
 	u32		cmd_op;
-	u32		pad;
-	u8		pdu[32]; /* available inline for free use */
+	u8		pdu[28]; /* available inline for free use */
+};
+
+struct ioucmd_list {
+	struct io_uring_cmd *head;
+	struct io_uring_cmd *tail;
 };
 
 #if defined(CONFIG_IO_URING)
@@ -54,6 +59,27 @@ static inline void io_uring_free(struct task_struct *tsk)
 	if (tsk->io_uring)
 		__io_uring_free(tsk);
 }
+
+static inline struct io_uring_cmd *ioucmd_list_get(struct ioucmd_list *il)
+{
+	struct io_uring_cmd *ioucmd = il->head;
+
+	il->head = il->tail = NULL;
+
+	return ioucmd;
+}
+
+static inline void ioucmd_list_add(struct ioucmd_list *il,
+		struct io_uring_cmd *ioucmd)
+{
+	ioucmd->next = NULL;
+
+	if (il->tail)
+		il->tail->next = ioucmd;
+	else
+		il->head = ioucmd;
+	il->tail = ioucmd;
+}
 #else
 static inline void io_uring_cmd_done(struct io_uring_cmd *cmd, ssize_t ret,
 		ssize_t ret2)
@@ -80,6 +106,14 @@ static inline const char *io_uring_get_opcode(u8 opcode)
 {
 	return "";
 }
+static inline struct io_uring_cmd *ioucmd_list_get(struct ioucmd_list *il)
+{
+	return NULL;
+}
+static inline void ioucmd_list_add(struct ioucmd_list *il,
+		struct io_uring_cmd *ioucmd)
+{
+}
 #endif
 
 #endif
-- 
2.25.1


  parent reply	other threads:[~2022-07-11 11:28 UTC|newest]

Thread overview: 52+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <CGME20220711110753epcas5p4169b9e288d15ca35740dbb66a6f6983a@epcas5p4.samsung.com>
2022-07-11 11:01 ` [PATCH for-next 0/4] nvme-multipathing for uring-passthrough Kanchan Joshi
     [not found]   ` <CGME20220711110800epcas5p3d338dd486fd778c5ba5bfe93a91ec8bd@epcas5p3.samsung.com>
2022-07-11 11:01     ` [PATCH for-next 1/4] io_uring, nvme: rename a function Kanchan Joshi
2022-07-14 13:55       ` Ming Lei
     [not found]   ` <CGME20220711110812epcas5p33aa90b23aa62fb11722aa8195754becf@epcas5p3.samsung.com>
2022-07-11 11:01     ` [PATCH for-next 2/4] nvme: compact nvme_uring_cmd_pdu struct Kanchan Joshi
2022-07-12  6:32       ` Christoph Hellwig
     [not found]   ` <CGME20220711110824epcas5p22c8e945cb8c3c3ac46c8c2b5ab55db9b@epcas5p2.samsung.com>
2022-07-11 11:01     ` Kanchan Joshi [this message]
2022-07-11 17:00       ` [PATCH for-next 3/4] io_uring: grow a field in struct io_uring_cmd Sagi Grimberg
2022-07-11 17:19         ` Jens Axboe
2022-07-11 17:18       ` Jens Axboe
2022-07-11 17:55         ` Sagi Grimberg
2022-07-11 18:22           ` Sagi Grimberg
2022-07-11 18:24             ` Jens Axboe
2022-07-11 18:58               ` Sagi Grimberg
2022-07-12 11:40               ` Kanchan Joshi
2022-07-14  3:40             ` Ming Lei
2022-07-14  8:19               ` Kanchan Joshi
2022-07-14 15:30                 ` Daniel Wagner
2022-07-15 11:07                   ` Kanchan Joshi
2022-07-18  9:03                     ` Daniel Wagner
     [not found]   ` <CGME20220711110827epcas5p3fd81f142f55ca3048abc38a9ef0d0089@epcas5p3.samsung.com>
2022-07-11 11:01     ` [PATCH for-next 4/4] nvme-multipath: add multipathing for uring-passthrough commands Kanchan Joshi
2022-07-11 13:51       ` Sagi Grimberg
2022-07-11 15:12         ` Stefan Metzmacher
2022-07-11 16:58           ` Sagi Grimberg
2022-07-11 18:54           ` Kanchan Joshi
2022-07-11 18:37         ` Kanchan Joshi
2022-07-11 19:56           ` Sagi Grimberg
2022-07-12  4:23             ` Kanchan Joshi
2022-07-12 21:26               ` Sagi Grimberg
2022-07-13  5:37                 ` Kanchan Joshi
2022-07-13  9:03                   ` Sagi Grimberg
2022-07-13 11:28                     ` Kanchan Joshi
2022-07-13 12:17                       ` Sagi Grimberg
2022-07-14 15:14                   ` Ming Lei
2022-07-14 23:05                     ` Kanchan Joshi
2022-07-15  1:35                       ` Ming Lei
2022-07-15  1:46                         ` Ming Lei
2022-07-15  4:24                           ` Kanchan Joshi
2022-07-12  6:52       ` Christoph Hellwig
2022-07-12 11:33         ` Kanchan Joshi
2022-07-12 20:13         ` Sagi Grimberg
2022-07-13  5:36           ` Christoph Hellwig
2022-07-13  8:04             ` Sagi Grimberg
2022-07-13 10:12               ` Christoph Hellwig
2022-07-13 11:00                 ` Sagi Grimberg
2022-07-13 11:28                   ` Christoph Hellwig
2022-07-13 12:16                     ` Sagi Grimberg
2022-07-13 11:49                   ` Hannes Reinecke
2022-07-13 12:43                     ` Sagi Grimberg
2022-07-13 13:30                       ` Hannes Reinecke
2022-07-13 13:41                         ` Sagi Grimberg
2022-07-13 14:07                           ` Hannes Reinecke
2022-07-13 15:59                             ` Sagi Grimberg

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