[PATCH v5 02/12] hw/block/nvme: Merge nvme_write_zeroes() with nvme_write()

From: Klaus Jensen <its@irrelevant.dk>
To: qemu-devel@nongnu.org
Cc: Kevin Wolf <kwolf@redhat.com>, Fam Zheng <fam@euphon.net>,
	qemu-block@nongnu.org, Niklas Cassel <Niklas.Cassel@wdc.com>,
	Dmitry Fomichev <dmitry.fomichev@wdc.com>,
	Klaus Jensen <k.jensen@samsung.com>,
	Max Reitz <mreitz@redhat.com>, Keith Busch <kbusch@kernel.org>,
	Stefan Hajnoczi <stefanha@redhat.com>,
	Klaus Jensen <its@irrelevant.dk>
Subject: [PATCH v5 02/12] hw/block/nvme: Merge nvme_write_zeroes() with nvme_write()
Date: Fri, 27 Nov 2020 00:45:51 +0100	[thread overview]
Message-ID: <20201126234601.689714-3-its@irrelevant.dk> (raw)
In-Reply-To: <20201126234601.689714-1-its@irrelevant.dk>

From: Dmitry Fomichev <dmitry.fomichev@wdc.com>

nvme_write() now handles WRITE, WRITE ZEROES and ZONE_APPEND.

Signed-off-by: Dmitry Fomichev <dmitry.fomichev@wdc.com>
Reviewed-by: Niklas Cassel <Niklas.Cassel@wdc.com>
[kj: rebased]
Signed-off-by: Klaus Jensen <k.jensen@samsung.com>
---
 hw/block/nvme.c       | 69 +++++++++++++++++--------------------------
 hw/block/trace-events |  1 -
 2 files changed, 27 insertions(+), 43 deletions(-)

diff --git a/hw/block/nvme.c b/hw/block/nvme.c
index 657d0b8b2922..0050ef87cb92 100644
--- a/hw/block/nvme.c
+++ b/hw/block/nvme.c
@@ -1449,31 +1449,6 @@ invalid:
     return status;
 }
 
-static uint16_t nvme_write_zeroes(NvmeCtrl *n, NvmeRequest *req)
-{
-    NvmeRwCmd *rw = (NvmeRwCmd *)&req->cmd;
-    NvmeNamespace *ns = req->ns;
-    uint64_t slba = le64_to_cpu(rw->slba);
-    uint32_t nlb = (uint32_t)le16_to_cpu(rw->nlb) + 1;
-    uint64_t offset = nvme_l2b(ns, slba);
-    uint32_t count = nvme_l2b(ns, nlb);
-    uint16_t status;
-
-    trace_pci_nvme_write_zeroes(nvme_cid(req), nvme_nsid(ns), slba, nlb);
-
-    status = nvme_check_bounds(ns, slba, nlb);
-    if (status) {
-        trace_pci_nvme_err_invalid_lba_range(slba, nlb, ns->id_ns.nsze);
-        return status;
-    }
-
-    block_acct_start(blk_get_stats(req->ns->blkconf.blk), &req->acct, 0,
-                     BLOCK_ACCT_WRITE);
-    req->aiocb = blk_aio_pwrite_zeroes(req->ns->blkconf.blk, offset, count,
-                                       BDRV_REQ_MAY_UNMAP, nvme_rw_cb, req);
-    return NVME_NO_COMPLETE;
-}
-
 static uint16_t nvme_write(NvmeCtrl *n, NvmeRequest *req)
 {
     NvmeRwCmd *rw = (NvmeRwCmd *)&req->cmd;
@@ -1483,15 +1458,18 @@ static uint16_t nvme_write(NvmeCtrl *n, NvmeRequest *req)
     uint64_t data_size = nvme_l2b(ns, nlb);
     uint64_t data_offset;
     BlockBackend *blk = ns->blkconf.blk;
+    bool wrz = rw->opcode == NVME_CMD_WRITE_ZEROES;
     uint16_t status;
 
     trace_pci_nvme_write(nvme_cid(req), nvme_io_opc_str(rw->opcode),
                          nvme_nsid(ns), nlb, data_size, slba);
 
-    status = nvme_check_mdts(n, data_size);
-    if (status) {
-        trace_pci_nvme_err_mdts(nvme_cid(req), data_size);
-        goto invalid;
+    if (!wrz) {
+        status = nvme_check_mdts(n, data_size);
+        if (status) {
+            trace_pci_nvme_err_mdts(nvme_cid(req), data_size);
+            goto invalid;
+        }
     }
 
     status = nvme_check_bounds(ns, slba, nlb);
@@ -1500,22 +1478,30 @@ static uint16_t nvme_write(NvmeCtrl *n, NvmeRequest *req)
         goto invalid;
     }
 
-    status = nvme_map_dptr(n, data_size, req);
-    if (status) {
-        goto invalid;
-    }
-
     data_offset = nvme_l2b(ns, slba);
 
-    block_acct_start(blk_get_stats(blk), &req->acct, data_size,
-                     BLOCK_ACCT_WRITE);
-    if (req->qsg.sg) {
-        req->aiocb = dma_blk_write(blk, &req->qsg, data_offset,
-                                   BDRV_SECTOR_SIZE, nvme_rw_cb, req);
+    if (!wrz) {
+        status = nvme_map_dptr(n, data_size, req);
+        if (status) {
+            goto invalid;
+        }
+
+        block_acct_start(blk_get_stats(blk), &req->acct, data_size,
+                         BLOCK_ACCT_WRITE);
+        if (req->qsg.sg) {
+            req->aiocb = dma_blk_write(blk, &req->qsg, data_offset,
+                                       BDRV_SECTOR_SIZE, nvme_rw_cb, req);
+        } else {
+            req->aiocb = blk_aio_pwritev(blk, data_offset, &req->iov, 0,
+                                         nvme_rw_cb, req);
+        }
     } else {
-        req->aiocb = blk_aio_pwritev(blk, data_offset, &req->iov, 0,
-                                     nvme_rw_cb, req);
+        block_acct_start(blk_get_stats(blk), &req->acct, 0, BLOCK_ACCT_WRITE);
+        req->aiocb = blk_aio_pwrite_zeroes(blk, data_offset, data_size,
+                                           BDRV_REQ_MAY_UNMAP, nvme_rw_cb,
+                                           req);
     }
+
     return NVME_NO_COMPLETE;
 
 invalid:
@@ -1547,7 +1533,6 @@ static uint16_t nvme_io_cmd(NvmeCtrl *n, NvmeRequest *req)
     case NVME_CMD_FLUSH:
         return nvme_flush(n, req);
     case NVME_CMD_WRITE_ZEROES:
-        return nvme_write_zeroes(n, req);
     case NVME_CMD_WRITE:
         return nvme_write(n, req);
     case NVME_CMD_READ:
diff --git a/hw/block/trace-events b/hw/block/trace-events
index cc269b51a1e0..35ea40c49169 100644
--- a/hw/block/trace-events
+++ b/hw/block/trace-events
@@ -47,7 +47,6 @@ pci_nvme_copy(uint16_t cid, uint32_t nsid, uint16_t nr, uint8_t format) "cid %"P
 pci_nvme_copy_source_range(uint64_t slba, uint32_t nlb) "slba 0x%"PRIx64" nlb %"PRIu32""
 pci_nvme_copy_in_complete(uint16_t cid) "cid %"PRIu16""
 pci_nvme_copy_cb(uint16_t cid) "cid %"PRIu16""
-pci_nvme_write_zeroes(uint16_t cid, uint32_t nsid, uint64_t slba, uint32_t nlb) "cid %"PRIu16" nsid %"PRIu32" slba %"PRIu64" nlb %"PRIu32""
 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""
-- 
2.29.2


