diff mbox

[rfc,02/10] nvme-pci: Add budget to __nvme_process_cq

Message ID 1489065402-14757-3-git-send-email-sagi@grimberg.me (mailing list archive)
State RFC
Headers show

Commit Message

Sagi Grimberg March 9, 2017, 1:16 p.m. UTC 
Prepare to allow passing a batch size to nvme cq processing.

This patch does not change an functionality.

Signed-off-by: Sagi Grimberg <sagi@grimberg.me>
---
 drivers/nvme/host/pci.c | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

Comments

Johannes Thumshirn March 9, 2017, 1:46 p.m. UTC | #1 
On 03/09/2017 02:16 PM, Sagi Grimberg wrote:
> Prepare to allow passing a batch size to nvme cq processing.
> 
> This patch does not change an functionality.
> 
> Signed-off-by: Sagi Grimberg <sagi@grimberg.me>
> ---

I think I already did this with the 1st RFC (this patch gives me a deja
vu moment), but:
Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de>
Christoph Hellwig March 22, 2017, 7:08 p.m. UTC | #2 
Looks good,

Reviewed-by: Christoph Hellwig <hch@lst.de>
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diff mbox

Patch

diff --git a/drivers/nvme/host/pci.c b/drivers/nvme/host/pci.c
index d3f74fa40f26..4ed67f194cfd 100644
--- a/drivers/nvme/host/pci.c
+++ b/drivers/nvme/host/pci.c
@@ -716,14 +716,15 @@  static inline bool nvme_read_cqe(struct nvme_queue *nvmeq,
 	return false;
 }
 
-static int __nvme_process_cq(struct nvme_queue *nvmeq, int *tag)
+static int __nvme_process_cq(struct nvme_queue *nvmeq, int budget, int *tag)
 {
 	struct nvme_completion cqe;
 	int consumed = 0;
 
 	while (nvme_read_cqe(nvmeq, &cqe)) {
 		nvme_handle_cqe(nvmeq, &cqe);
-		consumed++;
+		if (++consumed == budget)
+			break;
 
 		if (tag && *tag == cqe.command_id) {
 			*tag = -1;
@@ -741,7 +742,7 @@  static int __nvme_process_cq(struct nvme_queue *nvmeq, int *tag)
 
 static int nvme_process_cq(struct nvme_queue *nvmeq)
 {
-	return __nvme_process_cq(nvmeq, NULL);
+	return __nvme_process_cq(nvmeq, INT_MAX, NULL);
 }
 
 static irqreturn_t nvme_irq(int irq, void *data)
@@ -772,7 +773,7 @@  static int nvme_poll(struct blk_mq_hw_ctx *hctx, unsigned int tag)
 
 	if (nvme_cqe_valid(nvmeq, nvmeq->cq_head, nvmeq->cq_phase)) {
 		spin_lock_irq(&nvmeq->q_lock);
-		__nvme_process_cq(nvmeq, &tag);
+		__nvme_process_cq(nvmeq, INT_MAX, &tag);
 		spin_unlock_irq(&nvmeq->q_lock);
 
 		if (tag == -1)