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qemu-kvm/SOURCES/kvm-iscsi-Implement-copy-offloading.patch

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From d1046c844b369fb9cebc8f4f64274a9642152526 Mon Sep 17 00:00:00 2001
From: Fam Zheng <famz@redhat.com>
Date: Fri, 29 Jun 2018 06:11:48 +0200
Subject: [PATCH 174/268] iscsi: Implement copy offloading
RH-Author: Fam Zheng <famz@redhat.com>
Message-id: <20180629061153.12687-9-famz@redhat.com>
Patchwork-id: 81159
O-Subject: [RHEL-7.6 qemu-kvm-rhev PATCH v2 08/13] iscsi: Implement copy offloading
Bugzilla: 1482537
RH-Acked-by: Stefan Hajnoczi <stefanha@redhat.com>
RH-Acked-by: Max Reitz <mreitz@redhat.com>
RH-Acked-by: Kevin Wolf <kwolf@redhat.com>
Issue EXTENDED COPY (LID1) command to implement the copy_range API.
The parameter data construction code is modified from libiscsi's
iscsi-dd.c.
Signed-off-by: Fam Zheng <famz@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Message-id: 20180601092648.24614-9-famz@redhat.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
(cherry picked from commit 604dfaaa3270081da689991afe83d94d3e8231df)
Signed-off-by: Fam Zheng <famz@redhat.com>
Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
---
block/iscsi.c | 219 +++++++++++++++++++++++++++++++++++++++++++++++
include/scsi/constants.h | 4 +
2 files changed, 223 insertions(+)
diff --git a/block/iscsi.c b/block/iscsi.c
index 338f3dd..fbcd5bb 100644
--- a/block/iscsi.c
+++ b/block/iscsi.c
@@ -2187,6 +2187,221 @@ static void coroutine_fn iscsi_co_invalidate_cache(BlockDriverState *bs,
iscsi_allocmap_invalidate(iscsilun);
}
+static int coroutine_fn iscsi_co_copy_range_from(BlockDriverState *bs,
+ BdrvChild *src,
+ uint64_t src_offset,
+ BdrvChild *dst,
+ uint64_t dst_offset,
+ uint64_t bytes,
+ BdrvRequestFlags flags)
+{
+ return bdrv_co_copy_range_to(src, src_offset, dst, dst_offset, bytes, flags);
+}
+
+static struct scsi_task *iscsi_xcopy_task(int param_len)
+{
+ struct scsi_task *task;
+
+ task = g_new0(struct scsi_task, 1);
+
+ task->cdb[0] = EXTENDED_COPY;
+ task->cdb[10] = (param_len >> 24) & 0xFF;
+ task->cdb[11] = (param_len >> 16) & 0xFF;
+ task->cdb[12] = (param_len >> 8) & 0xFF;
+ task->cdb[13] = param_len & 0xFF;
+ task->cdb_size = 16;
+ task->xfer_dir = SCSI_XFER_WRITE;
+ task->expxferlen = param_len;
+
+ return task;
+}
+
+static void iscsi_populate_target_desc(unsigned char *desc, IscsiLun *lun)
+{
+ struct scsi_inquiry_device_designator *dd = lun->dd;
+
+ memset(desc, 0, 32);
+ desc[0] = 0xE4; /* IDENT_DESCR_TGT_DESCR */
+ desc[4] = dd->code_set;
+ desc[5] = (dd->designator_type & 0xF)
+ | ((dd->association & 3) << 4);
+ desc[7] = dd->designator_length;
+ memcpy(desc + 8, dd->designator, dd->designator_length);
+
+ desc[28] = 0;
+ desc[29] = (lun->block_size >> 16) & 0xFF;
+ desc[30] = (lun->block_size >> 8) & 0xFF;
+ desc[31] = lun->block_size & 0xFF;
+}
+
+static void iscsi_xcopy_desc_hdr(uint8_t *hdr, int dc, int cat, int src_index,
+ int dst_index)
+{
+ hdr[0] = 0x02; /* BLK_TO_BLK_SEG_DESCR */
+ hdr[1] = ((dc << 1) | cat) & 0xFF;
+ hdr[2] = (XCOPY_BLK2BLK_SEG_DESC_SIZE >> 8) & 0xFF;
+ /* don't account for the first 4 bytes in descriptor header*/
+ hdr[3] = (XCOPY_BLK2BLK_SEG_DESC_SIZE - 4 /* SEG_DESC_SRC_INDEX_OFFSET */) & 0xFF;
+ hdr[4] = (src_index >> 8) & 0xFF;
+ hdr[5] = src_index & 0xFF;
+ hdr[6] = (dst_index >> 8) & 0xFF;
+ hdr[7] = dst_index & 0xFF;
+}
+
+static void iscsi_xcopy_populate_desc(uint8_t *desc, int dc, int cat,
+ int src_index, int dst_index, int num_blks,
+ uint64_t src_lba, uint64_t dst_lba)
+{
+ iscsi_xcopy_desc_hdr(desc, dc, cat, src_index, dst_index);
+
+ /* The caller should verify the request size */
+ assert(num_blks < 65536);
+ desc[10] = (num_blks >> 8) & 0xFF;
+ desc[11] = num_blks & 0xFF;
+ desc[12] = (src_lba >> 56) & 0xFF;
+ desc[13] = (src_lba >> 48) & 0xFF;
+ desc[14] = (src_lba >> 40) & 0xFF;
+ desc[15] = (src_lba >> 32) & 0xFF;
+ desc[16] = (src_lba >> 24) & 0xFF;
+ desc[17] = (src_lba >> 16) & 0xFF;
+ desc[18] = (src_lba >> 8) & 0xFF;
+ desc[19] = src_lba & 0xFF;
+ desc[20] = (dst_lba >> 56) & 0xFF;
+ desc[21] = (dst_lba >> 48) & 0xFF;
+ desc[22] = (dst_lba >> 40) & 0xFF;
+ desc[23] = (dst_lba >> 32) & 0xFF;
+ desc[24] = (dst_lba >> 24) & 0xFF;
+ desc[25] = (dst_lba >> 16) & 0xFF;
+ desc[26] = (dst_lba >> 8) & 0xFF;
+ desc[27] = dst_lba & 0xFF;
+}
+
+static void iscsi_xcopy_populate_header(unsigned char *buf, int list_id, int str,
+ int list_id_usage, int prio,
+ int tgt_desc_len,
+ int seg_desc_len, int inline_data_len)
+{
+ buf[0] = list_id;
+ buf[1] = ((str & 1) << 5) | ((list_id_usage & 3) << 3) | (prio & 7);
+ buf[2] = (tgt_desc_len >> 8) & 0xFF;
+ buf[3] = tgt_desc_len & 0xFF;
+ buf[8] = (seg_desc_len >> 24) & 0xFF;
+ buf[9] = (seg_desc_len >> 16) & 0xFF;
+ buf[10] = (seg_desc_len >> 8) & 0xFF;
+ buf[11] = seg_desc_len & 0xFF;
+ buf[12] = (inline_data_len >> 24) & 0xFF;
+ buf[13] = (inline_data_len >> 16) & 0xFF;
+ buf[14] = (inline_data_len >> 8) & 0xFF;
+ buf[15] = inline_data_len & 0xFF;
+}
+
+static void iscsi_xcopy_data(struct iscsi_data *data,
+ IscsiLun *src, int64_t src_lba,
+ IscsiLun *dst, int64_t dst_lba,
+ uint16_t num_blocks)
+{
+ uint8_t *buf;
+ const int src_offset = XCOPY_DESC_OFFSET;
+ const int dst_offset = XCOPY_DESC_OFFSET + IDENT_DESCR_TGT_DESCR_SIZE;
+ const int seg_offset = dst_offset + IDENT_DESCR_TGT_DESCR_SIZE;
+
+ data->size = XCOPY_DESC_OFFSET +
+ IDENT_DESCR_TGT_DESCR_SIZE * 2 +
+ XCOPY_BLK2BLK_SEG_DESC_SIZE;
+ data->data = g_malloc0(data->size);
+ buf = data->data;
+
+ /* Initialise the parameter list header */
+ iscsi_xcopy_populate_header(buf, 1, 0, 2 /* LIST_ID_USAGE_DISCARD */,
+ 0, 2 * IDENT_DESCR_TGT_DESCR_SIZE,
+ XCOPY_BLK2BLK_SEG_DESC_SIZE,
+ 0);
+
+ /* Initialise CSCD list with one src + one dst descriptor */
+ iscsi_populate_target_desc(&buf[src_offset], src);
+ iscsi_populate_target_desc(&buf[dst_offset], dst);
+
+ /* Initialise one segment descriptor */
+ iscsi_xcopy_populate_desc(&buf[seg_offset], 0, 0, 0, 1, num_blocks,
+ src_lba, dst_lba);
+}
+
+static int coroutine_fn iscsi_co_copy_range_to(BlockDriverState *bs,
+ BdrvChild *src,
+ uint64_t src_offset,
+ BdrvChild *dst,
+ uint64_t dst_offset,
+ uint64_t bytes,
+ BdrvRequestFlags flags)
+{
+ IscsiLun *dst_lun = dst->bs->opaque;
+ IscsiLun *src_lun;
+ struct IscsiTask iscsi_task;
+ struct iscsi_data data;
+ int r = 0;
+ int block_size;
+
+ if (src->bs->drv->bdrv_co_copy_range_to != iscsi_co_copy_range_to) {
+ return -ENOTSUP;
+ }
+ src_lun = src->bs->opaque;
+
+ if (!src_lun->dd || !dst_lun->dd) {
+ return -ENOTSUP;
+ }
+ if (!is_byte_request_lun_aligned(dst_offset, bytes, dst_lun)) {
+ return -ENOTSUP;
+ }
+ if (!is_byte_request_lun_aligned(src_offset, bytes, src_lun)) {
+ return -ENOTSUP;
+ }
+ if (dst_lun->block_size != src_lun->block_size ||
+ !dst_lun->block_size) {
+ return -ENOTSUP;
+ }
+
+ block_size = dst_lun->block_size;
+ if (bytes / block_size > 65535) {
+ return -ENOTSUP;
+ }
+
+ iscsi_xcopy_data(&data,
+ src_lun, src_offset / block_size,
+ dst_lun, dst_offset / block_size,
+ bytes / block_size);
+
+ iscsi_co_init_iscsitask(dst_lun, &iscsi_task);
+
+ qemu_mutex_lock(&dst_lun->mutex);
+ iscsi_task.task = iscsi_xcopy_task(data.size);
+retry:
+ if (iscsi_scsi_command_async(dst_lun->iscsi, dst_lun->lun,
+ iscsi_task.task, iscsi_co_generic_cb,
+ &data,
+ &iscsi_task) != 0) {
+ r = -EIO;
+ goto out_unlock;
+ }
+
+ iscsi_co_wait_for_task(&iscsi_task, dst_lun);
+
+ if (iscsi_task.do_retry) {
+ iscsi_task.complete = 0;
+ goto retry;
+ }
+
+ if (iscsi_task.status != SCSI_STATUS_GOOD) {
+ r = iscsi_task.err_code;
+ goto out_unlock;
+ }
+
+out_unlock:
+ g_free(iscsi_task.task);
+ qemu_mutex_unlock(&dst_lun->mutex);
+ g_free(iscsi_task.err_str);
+ return r;
+}
+
static QemuOptsList iscsi_create_opts = {
.name = "iscsi-create-opts",
.head = QTAILQ_HEAD_INITIALIZER(iscsi_create_opts.head),
@@ -2221,6 +2436,8 @@ static BlockDriver bdrv_iscsi = {
.bdrv_co_block_status = iscsi_co_block_status,
.bdrv_co_pdiscard = iscsi_co_pdiscard,
+ .bdrv_co_copy_range_from = iscsi_co_copy_range_from,
+ .bdrv_co_copy_range_to = iscsi_co_copy_range_to,
.bdrv_co_pwrite_zeroes = iscsi_co_pwrite_zeroes,
.bdrv_co_readv = iscsi_co_readv,
.bdrv_co_writev_flags = iscsi_co_writev_flags,
@@ -2256,6 +2473,8 @@ static BlockDriver bdrv_iser = {
.bdrv_co_block_status = iscsi_co_block_status,
.bdrv_co_pdiscard = iscsi_co_pdiscard,
+ .bdrv_co_copy_range_from = iscsi_co_copy_range_from,
+ .bdrv_co_copy_range_to = iscsi_co_copy_range_to,
.bdrv_co_pwrite_zeroes = iscsi_co_pwrite_zeroes,
.bdrv_co_readv = iscsi_co_readv,
.bdrv_co_writev_flags = iscsi_co_writev_flags,
diff --git a/include/scsi/constants.h b/include/scsi/constants.h
index a141dd7..083a8e8 100644
--- a/include/scsi/constants.h
+++ b/include/scsi/constants.h
@@ -311,4 +311,8 @@
#define MMC_PROFILE_HDDVD_RW_DL 0x005A
#define MMC_PROFILE_INVALID 0xFFFF
+#define XCOPY_DESC_OFFSET 16
+#define IDENT_DESCR_TGT_DESCR_SIZE 32
+#define XCOPY_BLK2BLK_SEG_DESC_SIZE 28
+
#endif
--
1.8.3.1
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