From: "Meneghini, John" <John.Meneghini@netapp.com>
To: Mike Snitzer <snitzer@redhat.com>, Sagi Grimberg <sagi@grimberg.me>
Cc: "linux-nvme@lists.infradead.org" <linux-nvme@lists.infradead.org>,
Christoph Hellwig <hch@infradead.org>,
"dm-devel@redhat.com" <dm-devel@redhat.com>,
Hannes Reinecke <hare@suse.de>, Chao Leng <lengchao@huawei.com>,
Keith Busch <kbusch@kernel.org>,
"Meneghini, John" <John.Meneghini@netapp.com>,
Ewan Milne <emilne@redhat.com>
Subject: Re: [RESEND PATCH] nvme: explicitly use normal NVMe error handling when appropriate
Date: Thu, 13 Aug 2020 15:29:00 +0000 [thread overview]
Message-ID: <A90B4EF6-354C-4735-9E5A-45BF27F520E2@netapp.com> (raw)
In-Reply-To: <20200813144811.GA5452@redhat.com>
Mike,
I don't see your patch at:
https://patchwork.kernel.org/project/linux-block/list/?submitter=1643
Can you please upload this patch there?
Thanks,
/John
On 8/13/20, 10:48 AM, "Mike Snitzer" <snitzer@redhat.com> wrote:
Commit 764e9332098c0 ("nvme-multipath: do not reset on unknown
status"), among other things, fixed NVME_SC_CMD_INTERRUPTED error
handling by changing multipathing's nvme_failover_req() to short-circuit
path failover and then fallback to NVMe's normal error handling (which
takes care of NVME_SC_CMD_INTERRUPTED).
This detour through native NVMe multipathing code is unwelcome because
it prevents NVMe core from handling NVME_SC_CMD_INTERRUPTED independent
of any multipathing concerns.
Introduce nvme_status_needs_local_error_handling() to prioritize
non-failover retry, when appropriate, in terms of normal NVMe error
handling. nvme_status_needs_local_error_handling() will naturely evolve
to include handling of any other errors that normal error handling must
be used for.
nvme_failover_req()'s ability to fallback to normal NVMe error handling
has been preserved because it may be useful for future NVME_SC that
nvme_status_needs_local_error_handling() hasn't been trained for yet.
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
---
drivers/nvme/host/core.c | 16 ++++++++++++++--
1 file changed, 14 insertions(+), 2 deletions(-)
diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c
index 88cff309d8e4..be749b690af7 100644
--- a/drivers/nvme/host/core.c
+++ b/drivers/nvme/host/core.c
@@ -252,6 +252,16 @@ static inline bool nvme_req_needs_retry(struct request *req)
return true;
}
+static inline bool nvme_status_needs_local_error_handling(u16 status)
+{
+ switch (status & 0x7ff) {
+ case NVME_SC_CMD_INTERRUPTED:
+ return true;
+ default:
+ return false;
+ }
+}
+
static void nvme_retry_req(struct request *req)
{
struct nvme_ns *ns = req->q->queuedata;
@@ -270,7 +280,8 @@ static void nvme_retry_req(struct request *req)
void nvme_complete_rq(struct request *req)
{
- blk_status_t status = nvme_error_status(nvme_req(req)->status);
+ u16 nvme_status = nvme_req(req)->status;
+ blk_status_t status = nvme_error_status(nvme_status);
trace_nvme_complete_rq(req);
@@ -280,7 +291,8 @@ void nvme_complete_rq(struct request *req)
nvme_req(req)->ctrl->comp_seen = true;
if (unlikely(status != BLK_STS_OK && nvme_req_needs_retry(req))) {
- if ((req->cmd_flags & REQ_NVME_MPATH) && nvme_failover_req(req))
+ if (!nvme_status_needs_local_error_handling(nvme_status) &&
+ (req->cmd_flags & REQ_NVME_MPATH) && nvme_failover_req(req))
return;
if (!blk_queue_dying(req->q)) {
--
2.18.0
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next prev parent reply other threads:[~2020-08-13 15:29 UTC|newest]
Thread overview: 50+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-07-27 5:58 [PATCH] nvme-core: fix io interrupt when work with dm-multipah Chao Leng
2020-07-28 11:19 ` Christoph Hellwig
2020-07-29 2:54 ` Chao Leng
2020-07-29 5:59 ` Christoph Hellwig
2020-07-30 1:49 ` Chao Leng
2020-08-05 6:40 ` Chao Leng
2020-08-05 15:29 ` Keith Busch
2020-08-06 5:52 ` Chao Leng
2020-08-06 14:26 ` Keith Busch
2020-08-06 15:59 ` Meneghini, John
2020-08-06 16:17 ` Meneghini, John
2020-08-06 18:40 ` Mike Snitzer
2020-08-06 19:19 ` [PATCH] nvme: restore use of blk_path_error() in nvme_complete_rq() Mike Snitzer
2020-08-06 22:42 ` Meneghini, John
2020-08-07 0:07 ` Mike Snitzer
2020-08-07 1:21 ` Sagi Grimberg
2020-08-07 4:50 ` Mike Snitzer
2020-08-07 23:35 ` Sagi Grimberg
2020-08-08 21:08 ` Meneghini, John
2020-08-08 21:11 ` Meneghini, John
2020-08-10 14:48 ` Mike Snitzer
2020-08-11 12:54 ` Meneghini, John
2020-08-10 8:10 ` Chao Leng
2020-08-11 12:36 ` Meneghini, John
2020-08-12 7:51 ` Chao Leng
2020-08-10 14:36 ` Mike Snitzer
2020-08-10 17:22 ` [PATCH] nvme: explicitly use normal NVMe error handling when appropriate Mike Snitzer
2020-08-11 3:32 ` Chao Leng
2020-08-11 4:20 ` Mike Snitzer
2020-08-11 6:17 ` Chao Leng
2020-08-11 14:12 ` Mike Snitzer
2020-08-13 14:48 ` [RESEND PATCH] " Mike Snitzer
2020-08-13 15:29 ` Meneghini, John [this message]
2020-08-13 15:43 ` Mike Snitzer
2020-08-13 15:59 ` Meneghini, John
2020-08-13 15:36 ` Christoph Hellwig
2020-08-13 17:47 ` Mike Snitzer
2020-08-13 18:43 ` Christoph Hellwig
2020-08-13 19:03 ` Mike Snitzer
2020-08-14 4:26 ` Meneghini, John
2020-08-14 6:53 ` Sagi Grimberg
2020-08-14 6:55 ` Christoph Hellwig
2020-08-14 7:02 ` Sagi Grimberg
2020-08-14 3:23 ` Meneghini, John
2020-08-07 0:44 ` [PATCH] nvme: restore use of blk_path_error() in nvme_complete_rq() Sagi Grimberg
2020-08-10 12:43 ` Christoph Hellwig
2020-08-10 15:06 ` Mike Snitzer
2020-08-11 3:45 ` [PATCH] " Chao Leng
2020-08-07 0:03 ` [PATCH] nvme-core: fix io interrupt when work with dm-multipah Sagi Grimberg
2020-08-07 2:28 ` Chao Leng
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