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hw/block/nvme: add compare command 

Add the Compare command.

This implementation uses a bounce buffer to read in the data from
storage and then compare with the host supplied buffer.

Signed-off-by: Gollu Appalanaidu <anaidu.gollu@samsung.com>
[k.jensen: rebased]
Signed-off-by: Klaus Jensen <k.jensen@samsung.com>
Reviewed-by: Minwoo Im <minwoo.im.dev@gmail.com>
Reviewed-by: Keith Busch <kbusch@kernel.org>
This commit is contained in:
Gollu Appalanaidu 2020-11-16 11:14:02 +01:00 committed by Klaus Jensen
parent 2605257a26
commit 0a384f923f
2 changed files with 102 additions and 1 deletions
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101
hw/block/nvme.c
View File

@ -999,6 +999,51 @@ static void nvme_aio_discard_cb(void *opaque, int ret)
nvme_enqueue_req_completion(nvme_cq(req), req);
}
struct nvme_compare_ctx {
QEMUIOVector iov;
uint8_t *bounce;
size_t len;
};
static void nvme_compare_cb(void *opaque, int ret)
{
NvmeRequest *req = opaque;
NvmeNamespace *ns = req->ns;
struct nvme_compare_ctx *ctx = req->opaque;
g_autofree uint8_t *buf = NULL;
uint16_t status;
trace_pci_nvme_compare_cb(nvme_cid(req));
if (!ret) {
block_acct_done(blk_get_stats(ns->blkconf.blk), &req->acct);
} else {
block_acct_failed(blk_get_stats(ns->blkconf.blk), &req->acct);
nvme_aio_err(req, ret);
goto out;
}
buf = g_malloc(ctx->len);
status = nvme_dma(nvme_ctrl(req), buf, ctx->len, DMA_DIRECTION_TO_DEVICE,
req);
if (status) {
req->status = status;
goto out;
}
if (memcmp(buf, ctx->bounce, ctx->len)) {
req->status = NVME_CMP_FAILURE;
}
out:
qemu_iovec_destroy(&ctx->iov);
g_free(ctx->bounce);
g_free(ctx);
nvme_enqueue_req_completion(nvme_cq(req), req);
}
static uint16_t nvme_dsm(NvmeCtrl *n, NvmeRequest *req)
{
NvmeNamespace *ns = req->ns;
@ -1072,6 +1117,57 @@ static uint16_t nvme_dsm(NvmeCtrl *n, NvmeRequest *req)
return status;
}
static uint16_t nvme_compare(NvmeCtrl *n, NvmeRequest *req)
{
NvmeRwCmd *rw = (NvmeRwCmd *)&req->cmd;
NvmeNamespace *ns = req->ns;
BlockBackend *blk = ns->blkconf.blk;
uint64_t slba = le64_to_cpu(rw->slba);
uint32_t nlb = le16_to_cpu(rw->nlb) + 1;
size_t len = nvme_l2b(ns, nlb);
int64_t offset = nvme_l2b(ns, slba);
uint8_t *bounce = NULL;
struct nvme_compare_ctx *ctx = NULL;
uint16_t status;
trace_pci_nvme_compare(nvme_cid(req), nvme_nsid(ns), slba, nlb);
status = nvme_check_mdts(n, len);
if (status) {
trace_pci_nvme_err_mdts(nvme_cid(req), len);
return status;
}
status = nvme_check_bounds(ns, slba, nlb);
if (status) {
trace_pci_nvme_err_invalid_lba_range(slba, nlb, ns->id_ns.nsze);
return status;
}
if (NVME_ERR_REC_DULBE(ns->features.err_rec)) {
status = nvme_check_dulbe(ns, slba, nlb);
if (status) {
return status;
}
}
bounce = g_malloc(len);
ctx = g_new(struct nvme_compare_ctx, 1);
ctx->bounce = bounce;
ctx->len = len;
req->opaque = ctx;
qemu_iovec_init(&ctx->iov, 1);
qemu_iovec_add(&ctx->iov, bounce, len);
block_acct_start(blk_get_stats(blk), &req->acct, len, BLOCK_ACCT_READ);
blk_aio_preadv(blk, offset, &ctx->iov, 0, nvme_compare_cb, req);
return NVME_NO_COMPLETE;
}
static uint16_t nvme_flush(NvmeCtrl *n, NvmeRequest *req)
{
block_acct_start(blk_get_stats(req->ns->blkconf.blk), &req->acct, 0,
@ -1201,6 +1297,8 @@ static uint16_t nvme_io_cmd(NvmeCtrl *n, NvmeRequest *req)
case NVME_CMD_WRITE:
case NVME_CMD_READ:
return nvme_rw(n, req);
case NVME_CMD_COMPARE:
return nvme_compare(n, req);
case NVME_CMD_DSM:
return nvme_dsm(n, req);
default:
@ -2925,7 +3023,8 @@ static void nvme_init_ctrl(NvmeCtrl *n, PCIDevice *pci_dev)
id->cqes = (0x4 << 4) | 0x4;
id->nn = cpu_to_le32(n->num_namespaces);
id->oncs = cpu_to_le16(NVME_ONCS_WRITE_ZEROES | NVME_ONCS_TIMESTAMP |
NVME_ONCS_FEATURES | NVME_ONCS_DSM);
NVME_ONCS_FEATURES | NVME_ONCS_DSM |
NVME_ONCS_COMPARE);
id->vwc = 0x1;
id->sgls = cpu_to_le32(NVME_CTRL_SGLS_SUPPORT_NO_ALIGN |

2
hw/block/trace-events
View File

@ -46,6 +46,8 @@ pci_nvme_write_zeroes(uint16_t cid, uint32_t nsid, uint64_t slba, uint32_t nlb)
pci_nvme_block_status(int64_t offset, int64_t bytes, int64_t pnum, int ret, bool zeroed) "offset %"PRId64" bytes %"PRId64" pnum %"PRId64" ret 0x%x zeroed %d"
pci_nvme_dsm(uint16_t cid, uint32_t nsid, uint32_t nr, uint32_t attr) "cid %"PRIu16" nsid %"PRIu32" nr %"PRIu32" attr 0x%"PRIx32""
pci_nvme_dsm_deallocate(uint16_t cid, uint32_t nsid, uint64_t slba, uint32_t nlb) "cid %"PRIu16" nsid %"PRIu32" slba %"PRIu64" nlb %"PRIu32""
pci_nvme_compare(uint16_t cid, uint32_t nsid, uint64_t slba, uint32_t nlb) "cid %"PRIu16" nsid %"PRIu32" slba 0x%"PRIx64" nlb %"PRIu32""
pci_nvme_compare_cb(uint16_t cid) "cid %"PRIu16""
pci_nvme_aio_discard_cb(uint16_t cid) "cid %"PRIu16""
pci_nvme_create_sq(uint64_t addr, uint16_t sqid, uint16_t cqid, uint16_t qsize, uint16_t qflags) "create submission queue, addr=0x%"PRIx64", sqid=%"PRIu16", cqid=%"PRIu16", qsize=%"PRIu16", qflags=%"PRIu16""
pci_nvme_create_cq(uint64_t addr, uint16_t cqid, uint16_t vector, uint16_t size, uint16_t qflags, int ien) "create completion queue, addr=0x%"PRIx64", cqid=%"PRIu16", vector=%"PRIu16", qsize=%"PRIu16", qflags=%"PRIu16", ien=%d"