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nvme: Use the Maximum Queue Entries Supported (MQES) to initialize I/O queues

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Use the Maximum Queue Entries Supported (MQES) to initialize I/O queues
depth rather than picking a fixed number (256) which might not be
supported by some NVMe controllers (the NVMe specification says that an
NVMe controller may support any number between 2 to 4096).

Still cap the I/O queues depth to 256 since, during my testing, SeaBIOS
was running out of memory when using something higher than 256 (4096 on
the NVMe controller that I've had a chance to try).

Signed-off-by: Filippo Sironi <sironi@amazon.de>
This commit is contained in:
Filippo Sironi
2017-10-12 00:42:34 +02:00
committed by Kevin O'Connor
parent 5c1a2c7595
commit cd47172a67
1 changed files with 8 additions and 2 deletions
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src/hw/nvme.c
+8 -2
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@@ -318,8 +318,11 @@ nvme_create_io_cq(struct nvme_ctrl *ctrl, struct nvme_cq *cq, u16 q_idx)
{
int rc;
struct nvme_sqe *cmd_create_cq;
u16 length = 1 + (ctrl->reg->cap & 0xffff);
if (length > NVME_PAGE_SIZE / sizeof(struct nvme_cqe))
length = NVME_PAGE_SIZE / sizeof(struct nvme_cqe);
rc = nvme_init_cq(ctrl, cq, q_idx, NVME_PAGE_SIZE / sizeof(struct nvme_cqe));
rc = nvme_init_cq(ctrl, cq, q_idx, length);
if (rc) {
goto err;
}
@@ -359,8 +362,11 @@ nvme_create_io_sq(struct nvme_ctrl *ctrl, struct nvme_sq *sq, u16 q_idx, struct
{
int rc;
struct nvme_sqe *cmd_create_sq;
u16 length = 1 + (ctrl->reg->cap & 0xffff);
if (length > NVME_PAGE_SIZE / sizeof(struct nvme_cqe))
length = NVME_PAGE_SIZE / sizeof(struct nvme_cqe);
rc = nvme_init_sq(ctrl, sq, q_idx, NVME_PAGE_SIZE / sizeof(struct nvme_cqe), cq);
rc = nvme_init_sq(ctrl, sq, q_idx, length, cq);
if (rc) {
goto err;
}