diff options
| author | Sagi Grimberg <sagi@grimberg.me> | 2018-11-19 23:11:12 +0100 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2018-12-08 06:26:57 +0100 |
| commit | e6a622fd6d66b83779357e3400f487fc159a7d83 (patch) | |
| tree | 23c128b4f918466bea9dc3c7a2669ea9916ea849 /include | |
| parent | nvmet-fc: remove the IN_ISR deferred scheduling options (diff) | |
| download | linux-e6a622fd6d66b83779357e3400f487fc159a7d83.tar.xz linux-e6a622fd6d66b83779357e3400f487fc159a7d83.zip | |
nvmet: support fabrics sq flow control
Technical proposal 8005 "fabrics SQ flow control" introduces a mode
where a host and controller agree to omit sq_head pointer updates
when sending nvme completions.
In case the host indicated desire to operate in this mode (connect attribute)
the controller will return back a connect completion with sq_head value
of 0xffff as indication that it will omit sq_head pointer updates.
This mode saves us an atomic update in the I/O path.
Reviewed-by: Hannes Reinecke <hare@suse.com>
[hch: suggested better implementation]
Signed-off-by: Sagi Grimberg <sagi@grimberg.me>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/nvme.h | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/include/linux/nvme.h b/include/linux/nvme.h index 77d320d32ee5..e7d731776f62 100644 --- a/include/linux/nvme.h +++ b/include/linux/nvme.h @@ -1044,6 +1044,10 @@ struct nvmf_disc_rsp_page_hdr { struct nvmf_disc_rsp_page_entry entries[0]; }; +enum { + NVME_CONNECT_DISABLE_SQFLOW = (1 << 2), +}; + struct nvmf_connect_command { __u8 opcode; __u8 resv1; |