On 06/16/2017 07:56 AM, James Smart wrote:
> Since unsol rcv ISR and command cmpl ISR both access/lock
> this list, a separate get/put lists will reduce contention.
>
> Replaced
> struct list_head lpfc_nvmet_ctx_list;
> with
> struct list_head lpfc_nvmet_ctx_get_list;
> struct list_head lpfc_nvmet_ctx_put_list;
> and all correpsonding locks and counters.
>
> Signed-off-by: Dick Kennedy <dick.kenn...@broadcom.com>
> Signed-off-by: James Smart <james.sm...@broadcom.com>
> ---
> drivers/scsi/lpfc/lpfc_attr.c | 11 ++++--
> drivers/scsi/lpfc/lpfc_debugfs.c | 11 ++++--
> drivers/scsi/lpfc/lpfc_init.c | 16 +++++---
> drivers/scsi/lpfc/lpfc_nvmet.c | 82
> +++++++++++++++++++++++++++++-----------
> drivers/scsi/lpfc/lpfc_sli4.h | 9 +++--
> 5 files changed, 89 insertions(+), 40 deletions(-)
>
> diff --git a/drivers/scsi/lpfc/lpfc_attr.c b/drivers/scsi/lpfc/lpfc_attr.c
> index af22602b1058..4ed48ed38e79 100644
> --- a/drivers/scsi/lpfc/lpfc_attr.c
> +++ b/drivers/scsi/lpfc/lpfc_attr.c
> @@ -245,15 +245,18 @@ lpfc_nvme_info_show(struct device *dev, struct
> device_attribute *attr,
> atomic_read(&tgtp->xmt_abort_rsp),
> atomic_read(&tgtp->xmt_abort_rsp_error));
>
> - spin_lock(&phba->sli4_hba.nvmet_io_lock);
> + spin_lock(&phba->sli4_hba.nvmet_ctx_get_lock);
> + spin_lock(&phba->sli4_hba.nvmet_ctx_put_lock);
> tot = phba->sli4_hba.nvmet_xri_cnt -
> - phba->sli4_hba.nvmet_ctx_cnt;
> - spin_unlock(&phba->sli4_hba.nvmet_io_lock);
> + (phba->sli4_hba.nvmet_ctx_get_cnt +
> + phba->sli4_hba.nvmet_ctx_put_cnt);
> + spin_unlock(&phba->sli4_hba.nvmet_ctx_put_lock);
> + spin_unlock(&phba->sli4_hba.nvmet_ctx_get_lock);
>
> len += snprintf(buf + len, PAGE_SIZE - len,
> "IO_CTX: %08x WAIT: cur %08x tot %08x\n"
> "CTX Outstanding %08llx\n",
> - phba->sli4_hba.nvmet_ctx_cnt,
> + phba->sli4_hba.nvmet_xri_cnt,
> phba->sli4_hba.nvmet_io_wait_cnt,
> phba->sli4_hba.nvmet_io_wait_total,
> tot);
Question is if you need the lock here; after all, we could just store
the values in local variables and drop the lock altogether ...
> diff --git a/drivers/scsi/lpfc/lpfc_debugfs.c
> b/drivers/scsi/lpfc/lpfc_debugfs.c
> index cc49850e18a9..ed2850645e70 100644
> --- a/drivers/scsi/lpfc/lpfc_debugfs.c
> +++ b/drivers/scsi/lpfc/lpfc_debugfs.c
> @@ -848,15 +848,18 @@ lpfc_debugfs_nvmestat_data(struct lpfc_vport *vport,
> char *buf, int size)
> spin_unlock(&phba->sli4_hba.abts_nvme_buf_list_lock);
> }
>
> - spin_lock(&phba->sli4_hba.nvmet_io_lock);
> + spin_lock(&phba->sli4_hba.nvmet_ctx_get_lock);
> + spin_lock(&phba->sli4_hba.nvmet_ctx_put_lock);
> tot = phba->sli4_hba.nvmet_xri_cnt -
> - phba->sli4_hba.nvmet_ctx_cnt;
> - spin_unlock(&phba->sli4_hba.nvmet_io_lock);
> + (phba->sli4_hba.nvmet_ctx_get_cnt +
> + phba->sli4_hba.nvmet_ctx_put_cnt);
> + spin_unlock(&phba->sli4_hba.nvmet_ctx_put_lock);
> + spin_unlock(&phba->sli4_hba.nvmet_ctx_get_lock);
>
> len += snprintf(buf + len, size - len,
> "IO_CTX: %08x WAIT: cur %08x tot %08x\n"
> "CTX Outstanding %08llx\n",
> - phba->sli4_hba.nvmet_ctx_cnt,
> + phba->sli4_hba.nvmet_xri_cnt,
> phba->sli4_hba.nvmet_io_wait_cnt,
> phba->sli4_hba.nvmet_io_wait_total,
> tot);
Same here.
> diff --git a/drivers/scsi/lpfc/lpfc_init.c b/drivers/scsi/lpfc/lpfc_init.c
> index 77283705eb8d..7e73fdc154f7 100644
> --- a/drivers/scsi/lpfc/lpfc_init.c
> +++ b/drivers/scsi/lpfc/lpfc_init.c
> @@ -1281,10 +1281,13 @@ lpfc_hb_timeout_handler(struct lpfc_hba *phba)
> /* Check outstanding IO count */
> if (phba->cfg_enable_fc4_type & LPFC_ENABLE_NVME) {
> if (phba->nvmet_support) {
> - spin_lock(&phba->sli4_hba.nvmet_io_lock);
> + spin_lock(&phba->sli4_hba.nvmet_ctx_get_lock);
> + spin_lock(&phba->sli4_hba.nvmet_ctx_put_lock);
> tot = phba->sli4_hba.nvmet_xri_cnt -
> - phba->sli4_hba.nvmet_ctx_cnt;
> - spin_unlock(&phba->sli4_hba.nvmet_io_lock);
> + (phba->sli4_hba.nvmet_ctx_get_cnt +
> + phba->sli4_hba.nvmet_ctx_put_cnt);
> + spin_unlock(&phba->sli4_hba.nvmet_ctx_put_lock);
> + spin_unlock(&phba->sli4_hba.nvmet_ctx_get_lock);
> } else {
> tot = atomic_read(&phba->fc4NvmeIoCmpls);
> data1 = atomic_read(
> @@ -3487,7 +3490,6 @@ lpfc_sli4_nvmet_sgl_update(struct lpfc_hba *phba)
>
> /* For NVMET, ALL remaining XRIs are dedicated for IO processing */
> nvmet_xri_cnt = phba->sli4_hba.max_cfg_param.max_xri - els_xri_cnt;
> -
> if (nvmet_xri_cnt > phba->sli4_hba.nvmet_xri_cnt) {
> /* els xri-sgl expanded */
> xri_cnt = nvmet_xri_cnt - phba->sli4_hba.nvmet_xri_cnt;
> @@ -5935,7 +5937,8 @@ lpfc_sli4_driver_resource_setup(struct lpfc_hba *phba)
> spin_lock_init(&phba->sli4_hba.abts_nvme_buf_list_lock);
> INIT_LIST_HEAD(&phba->sli4_hba.lpfc_abts_nvme_buf_list);
> INIT_LIST_HEAD(&phba->sli4_hba.lpfc_abts_nvmet_ctx_list);
> - INIT_LIST_HEAD(&phba->sli4_hba.lpfc_nvmet_ctx_list);
> + INIT_LIST_HEAD(&phba->sli4_hba.lpfc_nvmet_ctx_get_list);
> + INIT_LIST_HEAD(&phba->sli4_hba.lpfc_nvmet_ctx_put_list);
> INIT_LIST_HEAD(&phba->sli4_hba.lpfc_nvmet_io_wait_list);
>
> /* Fast-path XRI aborted CQ Event work queue list */
> @@ -5944,7 +5947,8 @@ lpfc_sli4_driver_resource_setup(struct lpfc_hba *phba)
>
> /* This abort list used by worker thread */
> spin_lock_init(&phba->sli4_hba.sgl_list_lock);
> - spin_lock_init(&phba->sli4_hba.nvmet_io_lock);
> + spin_lock_init(&phba->sli4_hba.nvmet_ctx_get_lock);
> + spin_lock_init(&phba->sli4_hba.nvmet_ctx_put_lock);
> spin_lock_init(&phba->sli4_hba.nvmet_io_wait_lock);
>
> /*
> diff --git a/drivers/scsi/lpfc/lpfc_nvmet.c b/drivers/scsi/lpfc/lpfc_nvmet.c
> index 431faa0a4f3e..5fb29735e236 100644
> --- a/drivers/scsi/lpfc/lpfc_nvmet.c
> +++ b/drivers/scsi/lpfc/lpfc_nvmet.c
> @@ -267,11 +267,11 @@ lpfc_nvmet_ctxbuf_post(struct lpfc_hba *phba, struct
> lpfc_nvmet_ctxbuf *ctx_buf)
> }
> spin_unlock_irqrestore(&phba->sli4_hba.nvmet_io_wait_lock, iflag);
>
> - spin_lock_irqsave(&phba->sli4_hba.nvmet_io_lock, iflag);
> + spin_lock_irqsave(&phba->sli4_hba.nvmet_ctx_put_lock, iflag);
> list_add_tail(&ctx_buf->list,
> - &phba->sli4_hba.lpfc_nvmet_ctx_list);
> - phba->sli4_hba.nvmet_ctx_cnt++;
> - spin_unlock_irqrestore(&phba->sli4_hba.nvmet_io_lock, iflag);
> + &phba->sli4_hba.lpfc_nvmet_ctx_put_list);
> + phba->sli4_hba.nvmet_ctx_put_cnt++;
> + spin_unlock_irqrestore(&phba->sli4_hba.nvmet_ctx_put_lock, iflag);
> #endif
> }
>
> @@ -865,28 +865,46 @@ lpfc_nvmet_cleanup_io_context(struct lpfc_hba *phba)
> struct lpfc_nvmet_ctxbuf *ctx_buf, *next_ctx_buf;
> unsigned long flags;
>
> - list_for_each_entry_safe(
> - ctx_buf, next_ctx_buf,
> - &phba->sli4_hba.lpfc_nvmet_ctx_list, list) {
> - spin_lock_irqsave(
> - &phba->sli4_hba.abts_nvme_buf_list_lock, flags);
> + spin_lock_irqsave(&phba->sli4_hba.nvmet_ctx_get_lock, flags);
> + spin_lock_irq(&phba->sli4_hba.nvmet_ctx_put_lock);
What is that doing here? Shouldn't it be moved to the next list_for_each?
> + list_for_each_entry_safe(ctx_buf, next_ctx_buf,
> + &phba->sli4_hba.lpfc_nvmet_ctx_get_list, list) {
> + spin_lock_irq(&phba->sli4_hba.abts_nvme_buf_list_lock);
> list_del_init(&ctx_buf->list);
> - spin_unlock_irqrestore(
> - &phba->sli4_hba.abts_nvme_buf_list_lock, flags);
> + spin_unlock_irq(&phba->sli4_hba.abts_nvme_buf_list_lock);
> __lpfc_clear_active_sglq(phba,
> ctx_buf->sglq->sli4_lxritag);
> ctx_buf->sglq->state = SGL_FREED;
> ctx_buf->sglq->ndlp = NULL;
>
> - spin_lock_irqsave(&phba->sli4_hba.sgl_list_lock, flags);
> + spin_lock_irq(&phba->sli4_hba.sgl_list_lock);
> list_add_tail(&ctx_buf->sglq->list,
> &phba->sli4_hba.lpfc_nvmet_sgl_list);
> - spin_unlock_irqrestore(&phba->sli4_hba.sgl_list_lock,
> - flags);
> + spin_unlock_irq(&phba->sli4_hba.sgl_list_lock);
>
> lpfc_sli_release_iocbq(phba, ctx_buf->iocbq);
> kfree(ctx_buf->context);
> }
> + list_for_each_entry_safe(ctx_buf, next_ctx_buf,
> + &phba->sli4_hba.lpfc_nvmet_ctx_put_list, list) {
> + spin_lock_irq(&phba->sli4_hba.abts_nvme_buf_list_lock);
> + list_del_init(&ctx_buf->list);
> + spin_unlock_irq(&phba->sli4_hba.abts_nvme_buf_list_lock);
> + __lpfc_clear_active_sglq(phba,
> + ctx_buf->sglq->sli4_lxritag);
> + ctx_buf->sglq->state = SGL_FREED;
> + ctx_buf->sglq->ndlp = NULL;
> +
> + spin_lock_irq(&phba->sli4_hba.sgl_list_lock);
> + list_add_tail(&ctx_buf->sglq->list,
> + &phba->sli4_hba.lpfc_nvmet_sgl_list);
> + spin_unlock_irq(&phba->sli4_hba.sgl_list_lock);
> +
> + lpfc_sli_release_iocbq(phba, ctx_buf->iocbq);
> + kfree(ctx_buf->context);
> + }
> + spin_unlock_irq(&phba->sli4_hba.nvmet_ctx_put_lock);
> + spin_unlock_irqrestore(&phba->sli4_hba.nvmet_ctx_get_lock, flags);
> }
>
> static int
See above. Holding two locks at the same time as the old one doesn't
really reduce contention, no?
> @@ -958,12 +976,12 @@ lpfc_nvmet_setup_io_context(struct lpfc_hba *phba)
> "6407 Ran out of NVMET XRIs\n");
> return -ENOMEM;
> }
> - spin_lock(&phba->sli4_hba.nvmet_io_lock);
> + spin_lock(&phba->sli4_hba.nvmet_ctx_get_lock);
> list_add_tail(&ctx_buf->list,
> - &phba->sli4_hba.lpfc_nvmet_ctx_list);
> - spin_unlock(&phba->sli4_hba.nvmet_io_lock);
> + &phba->sli4_hba.lpfc_nvmet_ctx_get_list);
> + spin_unlock(&phba->sli4_hba.nvmet_ctx_get_lock);
> }
> - phba->sli4_hba.nvmet_ctx_cnt = phba->sli4_hba.nvmet_xri_cnt;
> + phba->sli4_hba.nvmet_ctx_get_cnt = phba->sli4_hba.nvmet_xri_cnt;
> return 0;
> }
>
Why is this not not protected by a spinlock?
The very first hunk suggested that it should...
> @@ -1370,13 +1388,31 @@ lpfc_nvmet_unsol_fcp_buffer(struct lpfc_hba *phba,
> goto dropit;
> }
>
> - spin_lock_irqsave(&phba->sli4_hba.nvmet_io_lock, iflag);
> - if (phba->sli4_hba.nvmet_ctx_cnt) {
> - list_remove_head(&phba->sli4_hba.lpfc_nvmet_ctx_list,
> + spin_lock_irqsave(&phba->sli4_hba.nvmet_ctx_get_lock, iflag);
> + if (phba->sli4_hba.nvmet_ctx_get_cnt) {
> + list_remove_head(&phba->sli4_hba.lpfc_nvmet_ctx_get_list,
> ctx_buf, struct lpfc_nvmet_ctxbuf, list);
> - phba->sli4_hba.nvmet_ctx_cnt--;
> + phba->sli4_hba.nvmet_ctx_get_cnt--;
> + } else {
> + spin_lock(&phba->sli4_hba.nvmet_ctx_put_lock);
> + if (phba->sli4_hba.nvmet_ctx_put_cnt) {
> + list_splice(&phba->sli4_hba.lpfc_nvmet_ctx_put_list,
> + &phba->sli4_hba.lpfc_nvmet_ctx_get_list);
> + INIT_LIST_HEAD(&phba->sli4_hba.lpfc_nvmet_ctx_put_list);
> + phba->sli4_hba.nvmet_ctx_get_cnt =
> + phba->sli4_hba.nvmet_ctx_put_cnt;
> + phba->sli4_hba.nvmet_ctx_put_cnt = 0;
> + spin_unlock(&phba->sli4_hba.nvmet_ctx_put_lock);
> +
> + list_remove_head(
> + &phba->sli4_hba.lpfc_nvmet_ctx_get_list,
> + ctx_buf, struct lpfc_nvmet_ctxbuf, list);
> + phba->sli4_hba.nvmet_ctx_get_cnt--;
> + } else {
> + spin_unlock(&phba->sli4_hba.nvmet_ctx_put_lock);
> + }
> }
> - spin_unlock_irqrestore(&phba->sli4_hba.nvmet_io_lock, iflag);
> + spin_unlock_irqrestore(&phba->sli4_hba.nvmet_ctx_get_lock, iflag);
>
> fc_hdr = (struct fc_frame_header *)(nvmebuf->hbuf.virt);
> oxid = be16_to_cpu(fc_hdr->fh_ox_id);
> diff --git a/drivers/scsi/lpfc/lpfc_sli4.h b/drivers/scsi/lpfc/lpfc_sli4.h
> index 830dc83b9c21..7a1d74e9e877 100644
> --- a/drivers/scsi/lpfc/lpfc_sli4.h
> +++ b/drivers/scsi/lpfc/lpfc_sli4.h
> @@ -621,7 +621,8 @@ struct lpfc_sli4_hba {
> uint16_t scsi_xri_start;
> uint16_t els_xri_cnt;
> uint16_t nvmet_xri_cnt;
> - uint16_t nvmet_ctx_cnt;
> + uint16_t nvmet_ctx_get_cnt;
> + uint16_t nvmet_ctx_put_cnt;
> uint16_t nvmet_io_wait_cnt;
> uint16_t nvmet_io_wait_total;
> struct list_head lpfc_els_sgl_list;
> @@ -630,7 +631,8 @@ struct lpfc_sli4_hba {
> struct list_head lpfc_abts_nvmet_ctx_list;
> struct list_head lpfc_abts_scsi_buf_list;
> struct list_head lpfc_abts_nvme_buf_list;
> - struct list_head lpfc_nvmet_ctx_list;
> + struct list_head lpfc_nvmet_ctx_get_list;
> + struct list_head lpfc_nvmet_ctx_put_list;
> struct list_head lpfc_nvmet_io_wait_list;
> struct lpfc_sglq **lpfc_sglq_active_list;
> struct list_head lpfc_rpi_hdr_list;
> @@ -662,7 +664,8 @@ struct lpfc_sli4_hba {
> spinlock_t abts_nvme_buf_list_lock; /* list of aborted SCSI IOs */
> spinlock_t abts_scsi_buf_list_lock; /* list of aborted SCSI IOs */
> spinlock_t sgl_list_lock; /* list of aborted els IOs */
> - spinlock_t nvmet_io_lock;
> + spinlock_t nvmet_ctx_get_lock; /* list of avail XRI contexts */
> + spinlock_t nvmet_ctx_put_lock; /* list of avail XRI contexts */
> spinlock_t nvmet_io_wait_lock; /* IOs waiting for ctx resources */
> uint32_t physical_port;
>
>
Cheers,
Hannes
--
Dr. Hannes Reinecke Teamlead Storage & Networking
h...@suse.de +49 911 74053 688
SUSE LINUX GmbH, Maxfeldstr. 5, 90409 Nürnberg
GF: F. Imendörffer, J. Smithard, J. Guild, D. Upmanyu, G. Norton
HRB 21284 (AG Nürnberg)
