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nvme: disable fabrics SQ flow control when asked by the user

Browse source 
As for now, we don't care about sq_head pointer updates anyway, so
at least allow the controller to micro-optimize by omiting this update.

Note that we will probably need to support it when a controller
that requires this comes along.

Signed-off-by: Sagi Grimberg <sagi@grimberg.me>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Sagi Grimberg 2018-11-19 14:11:15 -08:00 committed by Jens Axboe
parent 9b95d2fb85
commit 8154ed730b
2 changed files with 14 additions and 1 deletions
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13
drivers/nvme/host/fabrics.c
View file

@ -392,6 +392,9 @@ int nvmf_connect_admin_queue(struct nvme_ctrl *ctrl)
cmd.connect.kato = ctrl->opts->discovery_nqn ? 0 :
cpu_to_le32((ctrl->kato + NVME_KATO_GRACE) * 1000);
if (ctrl->opts->disable_sqflow)
cmd.connect.cattr |= NVME_CONNECT_DISABLE_SQFLOW;
data = kzalloc(sizeof(*data), GFP_KERNEL);
if (!data)
return -ENOMEM;
@ -451,6 +454,9 @@ int nvmf_connect_io_queue(struct nvme_ctrl *ctrl, u16 qid)
cmd.connect.qid = cpu_to_le16(qid);
cmd.connect.sqsize = cpu_to_le16(ctrl->sqsize);
if (ctrl->opts->disable_sqflow)
cmd.connect.cattr |= NVME_CONNECT_DISABLE_SQFLOW;
data = kzalloc(sizeof(*data), GFP_KERNEL);
if (!data)
return -ENOMEM;
@ -607,6 +613,7 @@ static const match_table_t opt_tokens = {
{ NVMF_OPT_HOST_TRADDR, "host_traddr=%s" },
{ NVMF_OPT_HOST_ID, "hostid=%s" },
{ NVMF_OPT_DUP_CONNECT, "duplicate_connect" },
{ NVMF_OPT_DISABLE_SQFLOW, "disable_sqflow" },
{ NVMF_OPT_ERR, NULL }
};
@ -817,6 +824,9 @@ static int nvmf_parse_options(struct nvmf_ctrl_options *opts,
case NVMF_OPT_DUP_CONNECT:
opts->duplicate_connect = true;
break;
case NVMF_OPT_DISABLE_SQFLOW:
opts->disable_sqflow = true;
break;
default:
pr_warn("unknown parameter or missing value '%s' in ctrl creation request\n",
p);
@ -933,7 +943,8 @@ EXPORT_SYMBOL_GPL(nvmf_free_options);
#define NVMF_REQUIRED_OPTS (NVMF_OPT_TRANSPORT | NVMF_OPT_NQN)
#define NVMF_ALLOWED_OPTS (NVMF_OPT_QUEUE_SIZE | NVMF_OPT_NR_IO_QUEUES | \
NVMF_OPT_KATO | NVMF_OPT_HOSTNQN | \
NVMF_OPT_HOST_ID | NVMF_OPT_DUP_CONNECT)
NVMF_OPT_HOST_ID | NVMF_OPT_DUP_CONNECT |\
NVMF_OPT_DISABLE_SQFLOW)
static struct nvme_ctrl *
nvmf_create_ctrl(struct device *dev, const char *buf, size_t count)

2
drivers/nvme/host/fabrics.h
View file

@ -58,6 +58,7 @@ enum {
NVMF_OPT_CTRL_LOSS_TMO = 1 << 11,
NVMF_OPT_HOST_ID = 1 << 12,
NVMF_OPT_DUP_CONNECT = 1 << 13,
NVMF_OPT_DISABLE_SQFLOW = 1 << 14,
};
/**
@ -101,6 +102,7 @@ struct nvmf_ctrl_options {
unsigned int kato;
struct nvmf_host *host;
int max_reconnects;
bool disable_sqflow;
};
/*