From: Klaus Jensen <address@hidden>
The num_queues device paramater has a slightly confusing meaning because
it accounts for the admin queue pair which is not really optional.
Secondly, it is really a maximum value of queues allowed.
Add a new max_ioqpairs parameter that only accounts for I/O queue pairs,
but keep num_queues for compatibility.
Signed-off-by: Klaus Jensen <address@hidden>
Reviewed-by: Maxim Levitsky <address@hidden>
---
hw/block/nvme.c | 46 ++++++++++++++++++++++++++++------------------
hw/block/nvme.h | 4 +++-
2 files changed, 31 insertions(+), 19 deletions(-)
diff --git a/hw/block/nvme.c b/hw/block/nvme.c
index 287e1e49c0bf..9383d2cb0b38 100644
--- a/hw/block/nvme.c
+++ b/hw/block/nvme.c
@@ -19,7 +19,7 @@
* -drive file=<file>,if=none,id=<drive_id>
* -device nvme,drive=<drive_id>,serial=<serial>,id=<id[optional]>, \
* cmb_size_mb=<cmb_size_mb[optional]>, \
- * num_queues=<N[optional]>
+ * max_ioqpairs=<N[optional]>
*
* Note cmb_size_mb denotes size of CMB in MB. CMB is assumed to be at
* offset 0 in BAR2 and supports only WDS, RDS and SQS for now.
@@ -27,6 +27,7 @@
#include "qemu/osdep.h"
#include "qemu/units.h"
+#include "qemu/error-report.h"
#include "hw/block/block.h"
#include "hw/pci/msix.h"
#include "hw/pci/pci.h"
@@ -72,12 +73,12 @@ static void nvme_addr_read(NvmeCtrl *n, hwaddr addr, void
*buf, int size)
static int nvme_check_sqid(NvmeCtrl *n, uint16_t sqid)
{
- return sqid < n->params.num_queues && n->sq[sqid] != NULL ? 0 : -1;
+ return sqid < n->params.max_ioqpairs + 1 && n->sq[sqid] != NULL ? 0 : -1;
}
static int nvme_check_cqid(NvmeCtrl *n, uint16_t cqid)
{
- return cqid < n->params.num_queues && n->cq[cqid] != NULL ? 0 : -1;
+ return cqid < n->params.max_ioqpairs + 1 && n->cq[cqid] != NULL ? 0 : -1;
}
static void nvme_inc_cq_tail(NvmeCQueue *cq)
@@ -639,7 +640,7 @@ static uint16_t nvme_create_cq(NvmeCtrl *n, NvmeCmd *cmd)
trace_nvme_dev_err_invalid_create_cq_addr(prp1);
return NVME_INVALID_FIELD | NVME_DNR;
}
- if (unlikely(vector > n->params.num_queues)) {
+ if (unlikely(vector > n->params.max_ioqpairs + 1)) {
trace_nvme_dev_err_invalid_create_cq_vector(vector);
return NVME_INVALID_IRQ_VECTOR | NVME_DNR;
}
@@ -791,8 +792,8 @@ static uint16_t nvme_get_feature(NvmeCtrl *n, NvmeCmd *cmd,
NvmeRequest *req)
trace_nvme_dev_getfeat_vwcache(result ? "enabled" : "disabled");
break;
case NVME_NUMBER_OF_QUEUES:
- result = cpu_to_le32((n->params.num_queues - 2) |
- ((n->params.num_queues - 2) << 16));
+ result = cpu_to_le32((n->params.max_ioqpairs - 1) |
+ ((n->params.max_ioqpairs - 1) << 16));
trace_nvme_dev_getfeat_numq(result);
break;
case NVME_TIMESTAMP:
@@ -836,10 +837,10 @@ static uint16_t nvme_set_feature(NvmeCtrl *n, NvmeCmd
*cmd, NvmeRequest *req)
case NVME_NUMBER_OF_QUEUES:
trace_nvme_dev_setfeat_numq((dw11 & 0xFFFF) + 1,
((dw11 >> 16) & 0xFFFF) + 1,
- n->params.num_queues - 1,
- n->params.num_queues - 1);
- req->cqe.result = cpu_to_le32((n->params.num_queues - 2) |
- ((n->params.num_queues - 2) << 16));
+ n->params.max_ioqpairs,
+ n->params.max_ioqpairs);
+ req->cqe.result = cpu_to_le32((n->params.max_ioqpairs - 1) |
+ ((n->params.max_ioqpairs - 1) << 16));
break;
case NVME_TIMESTAMP:
return nvme_set_feature_timestamp(n, cmd);
@@ -910,12 +911,12 @@ static void nvme_clear_ctrl(NvmeCtrl *n)
blk_drain(n->conf.blk);
- for (i = 0; i < n->params.num_queues; i++) {
+ for (i = 0; i < n->params.max_ioqpairs + 1; i++) {
if (n->sq[i] != NULL) {
nvme_free_sq(n->sq[i], n);
}
}
- for (i = 0; i < n->params.num_queues; i++) {
+ for (i = 0; i < n->params.max_ioqpairs + 1; i++) {
if (n->cq[i] != NULL) {
nvme_free_cq(n->cq[i], n);
}
@@ -1316,8 +1317,17 @@ static void nvme_realize(PCIDevice *pci_dev, Error
**errp)
int64_t bs_size;
uint8_t *pci_conf;
- if (!n->params.num_queues) {
- error_setg(errp, "num_queues can't be zero");
+ if (n->params.num_queues) {
+ warn_report("num_queues is deprecated; please use max_ioqpairs "
+ "instead");
+
+ n->params.max_ioqpairs = n->params.num_queues - 1;
+ }
+
+ if (n->params.max_ioqpairs < 1 ||
+ n->params.max_ioqpairs > PCI_MSIX_FLAGS_QSIZE) {
+ error_setg(errp, "max_ioqpairs must be between 1 and %d",
+ PCI_MSIX_FLAGS_QSIZE);
return;
}
@@ -1349,19 +1359,19 @@ static void nvme_realize(PCIDevice *pci_dev, Error **errp)
pcie_endpoint_cap_init(pci_dev, 0x80);
n->num_namespaces = 1;
- n->reg_size = pow2ceil(0x1000 + 2 * n->params.num_queues * 4);
+ n->reg_size = pow2ceil(0x1008 + 2 * (n->params.max_ioqpairs) * 4);
n->ns_size = bs_size / (uint64_t)n->num_namespaces;
n->namespaces = g_new0(NvmeNamespace, n->num_namespaces);
- n->sq = g_new0(NvmeSQueue *, n->params.num_queues);
- n->cq = g_new0(NvmeCQueue *, n->params.num_queues);
+ n->sq = g_new0(NvmeSQueue *, n->params.max_ioqpairs + 1);
+ n->cq = g_new0(NvmeCQueue *, n->params.max_ioqpairs + 1);
memory_region_init_io(&n->iomem, OBJECT(n), &nvme_mmio_ops, n,
"nvme", n->reg_size);
pci_register_bar(pci_dev, 0,
PCI_BASE_ADDRESS_SPACE_MEMORY | PCI_BASE_ADDRESS_MEM_TYPE_64,
&n->iomem);
- msix_init_exclusive_bar(pci_dev, n->params.num_queues, 4, NULL);
+ msix_init_exclusive_bar(pci_dev, n->params.max_ioqpairs + 1, 4, NULL);
id->vid = cpu_to_le16(pci_get_word(pci_conf + PCI_VENDOR_ID));
id->ssvid = cpu_to_le16(pci_get_word(pci_conf + PCI_SUBSYSTEM_VENDOR_ID));
diff --git a/hw/block/nvme.h b/hw/block/nvme.h
index 9957c4a200e2..98f5b9479244 100644
--- a/hw/block/nvme.h
+++ b/hw/block/nvme.h
@@ -6,11 +6,13 @@
#define DEFINE_NVME_PROPERTIES(_state, _props) \
DEFINE_PROP_STRING("serial", _state, _props.serial), \
DEFINE_PROP_UINT32("cmb_size_mb", _state, _props.cmb_size_mb, 0), \
- DEFINE_PROP_UINT32("num_queues", _state, _props.num_queues, 64)
+ DEFINE_PROP_UINT32("num_queues", _state, _props.num_queues, 0), \
+ DEFINE_PROP_UINT32("max_ioqpairs", _state, _props.max_ioqpairs, 64)
typedef struct NvmeParams {
char *serial;
uint32_t num_queues;