From: Christoph Hellwig <hch@lst.de>
Date: Wed, 21 Dec 2022 09:51:19 +0100
Subject: nvmet: don't defer passthrough commands with trivial effects to the
workqueue
Patch-mainline: v6.2-rc2
Git-commit: 2a459f6933e1c459bffb7cc73fd6c900edc714bd
References: git-fixes
Mask out the "Command Supported" and "Logical Block Content Change" bits
and only defer execution of commands that have non-trivial effects to
the workqueue for synchronous execution. This allows to execute admin
commands asynchronously on controllers that provide a Command Supported
and Effects log page, and will keep allowing to execute Write commands
asynchronously once command effects on I/O commands are taken into
account.
Fixes: c1fef73f793b ("nvmet: add passthru code to process commands")
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Keith Busch <kbusch@kernel.org>
Reviewed-by: Sagi Grimberg <sagi@grimberg.me>
Reviewed-by: Kanchan Joshi <joshi.k@samsung.com>
Acked-by: Daniel Wagner <dwagner@suse.de>
---
drivers/nvme/target/passthru.c | 11 +++++------
1 file changed, 5 insertions(+), 6 deletions(-)
--- a/drivers/nvme/target/passthru.c
+++ b/drivers/nvme/target/passthru.c
@@ -271,14 +271,13 @@ static void nvmet_passthru_execute_cmd(s
}
/*
- * If there are effects for the command we are about to execute, or
- * an end_req function we need to use nvme_execute_passthru_rq()
- * synchronously in a work item seeing the end_req function and
- * nvme_passthru_end() can't be called in the request done callback
- * which is typically in interrupt context.
+ * If a command needs post-execution fixups, or there are any
+ * non-trivial effects, make sure to execute the command synchronously
+ * in a workqueue so that nvme_passthru_end gets called.
*/
effects = nvme_command_effects(ctrl, ns, req->cmd->common.opcode);
- if (req->p.use_workqueue || effects) {
+ if (req->p.use_workqueue ||
+ (effects & ~(NVME_CMD_EFFECTS_CSUPP | NVME_CMD_EFFECTS_LBCC))) {
INIT_WORK(&req->p.work, nvmet_passthru_execute_cmd_work);
req->p.rq = rq;
queue_work(nvmet_wq, &req->p.work);