From: Paolo Bonzini <pbonzini@redhat.com>
Date: Thu, 23 Sep 2021 09:04:36 -0400
Subject: block: introduce max_hw_iov for use in scsi-generic

Git-commit: cc071629539dc1f303175a7e2d4ab854c0a8b20f
References: bsc#1190425

Linux limits the size of iovecs to 1024 (UIO_MAXIOV in the kernel
sources, IOV_MAX in POSIX).  Because of this, on some host adapters
requests with many iovecs are rejected with -EINVAL by the
io_submit() or readv()/writev() system calls.

In fact, the same limit applies to SG_IO as well.  To fix both the
EINVAL and the possible performance issues from using fewer iovecs
than allowed by Linux (some HBAs have max_segments as low as 128),
introduce a separate entry in BlockLimits to hold the max_segments
value from sysfs.  This new limit is used only for SG_IO and clamped
to bs->bl.max_iov anyway, just like max_hw_transfer is clamped to
bs->bl.max_transfer.

Reported-by: Halil Pasic <pasic@linux.ibm.com>
Cc: Hanna Reitz <hreitz@redhat.com>
Cc: Kevin Wolf <kwolf@redhat.com>
Cc: qemu-block@nongnu.org
Cc: qemu-stable@nongnu.org
Fixes: 18473467d5 ("file-posix: try BLKSECTGET on block devices too, do not round to power of 2", 2021-06-25)
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Message-Id: <20210923130436.1187591-1-pbonzini@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
(cherry picked from commit cc071629539dc1f303175a7e2d4ab854c0a8b20f)
Signed-off-by: Lin Ma <lma@suse.com>
---
 block/block-backend.c          | 6 ++++++
 block/file-posix.c             | 2 +-
 block/io.c                     | 1 +
 hw/scsi/scsi-generic.c         | 2 +-
 include/block/block_int.h      | 7 +++++++
 include/sysemu/block-backend.h | 1 +
 6 files changed, 17 insertions(+), 2 deletions(-)

diff --git a/block/block-backend.c b/block/block-backend.c
index 28908cd0bf3b11b7e1a3915df02d..a40854504211b169a0339225ac10 100644
--- a/block/block-backend.c
+++ b/block/block-backend.c
@@ -1850,6 +1850,12 @@ uint32_t blk_get_max_transfer(BlockBackend *blk)
     return ROUND_DOWN(max, blk_get_request_alignment(blk));
 }
 
+int blk_get_max_hw_iov(BlockBackend *blk)
+{
+    return MIN_NON_ZERO(blk->root->bs->bl.max_hw_iov,
+                        blk->root->bs->bl.max_iov);
+}
+
 int blk_get_max_iov(BlockBackend *blk)
 {
     return blk->root->bs->bl.max_iov;
diff --git a/block/file-posix.c b/block/file-posix.c
index 7dcd24c6fdb9618c527f2f884c32..2dc7d36c760406884dd248d3bef6 100644
--- a/block/file-posix.c
+++ b/block/file-posix.c
@@ -1160,7 +1160,7 @@ static void raw_refresh_limits(BlockDriverState *bs, Error **errp)
 
         ret = hdev_get_max_segments(s->fd, &st);
         if (ret > 0) {
-            bs->bl.max_iov = ret;
+            bs->bl.max_hw_iov = ret;
         }
     }
 }
diff --git a/block/io.c b/block/io.c
index c0e2c1c70d9aeef11ab1853f326e..e06ab63ce98c1d635274c6887ab3 100644
--- a/block/io.c
+++ b/block/io.c
@@ -134,6 +134,7 @@ static void bdrv_merge_limits(BlockLimits *dst, const BlockLimits *src)
     dst->min_mem_alignment = MAX(dst->min_mem_alignment,
                                  src->min_mem_alignment);
     dst->max_iov = MIN_NON_ZERO(dst->max_iov, src->max_iov);
+    dst->max_hw_iov = MIN_NON_ZERO(dst->max_hw_iov, src->max_hw_iov);
 }
 
 void bdrv_refresh_limits(BlockDriverState *bs, Error **errp)
diff --git a/hw/scsi/scsi-generic.c b/hw/scsi/scsi-generic.c
index af05add799afadec1c17a62fe1e3..ef1c8a38a2e838ecacbf4aa76122 100644
--- a/hw/scsi/scsi-generic.c
+++ b/hw/scsi/scsi-generic.c
@@ -173,7 +173,7 @@ static void scsi_handle_inquiry_reply(SCSIGenericReq *r, SCSIDevice *s)
         page = r->req.cmd.buf[2];
         if (page == 0xb0) {
             uint64_t max_transfer = blk_get_max_hw_transfer(s->conf.blk);
-            uint32_t max_iov = blk_get_max_iov(s->conf.blk);
+            uint32_t max_iov = blk_get_max_hw_iov(s->conf.blk);
 
             assert(max_transfer);
             max_transfer = MIN_NON_ZERO(max_transfer, max_iov * qemu_real_host_page_size)
diff --git a/include/block/block_int.h b/include/block/block_int.h
index c8926f50194b7b8ca9f40a0901c6..9c42319ab05a7ac96ef78d2996f8 100644
--- a/include/block/block_int.h
+++ b/include/block/block_int.h
@@ -644,6 +644,13 @@ typedef struct BlockLimits {
      */
     uint64_t max_hw_transfer;
 
+    /* Maximal number of scatter/gather elements allowed by the hardware.
+     * Applies whenever transfers to the device bypass the kernel I/O
+     * scheduler, for example with SG_IO.  If larger than max_iov
+     * or if zero, blk_get_max_hw_iov will fall back to max_iov.
+     */
+    int max_hw_iov;
+
     /* memory alignment, in bytes so that no bounce buffer is needed */
     size_t min_mem_alignment;
 
diff --git a/include/sysemu/block-backend.h b/include/sysemu/block-backend.h
index 8fd7258dae301c25279e69ee3fa6..556141ec148519b9cfc41e1a26ce 100644
--- a/include/sysemu/block-backend.h
+++ b/include/sysemu/block-backend.h
@@ -204,6 +204,7 @@ uint32_t blk_get_request_alignment(BlockBackend *blk);
 uint32_t blk_get_max_transfer(BlockBackend *blk);
 uint64_t blk_get_max_hw_transfer(BlockBackend *blk);
 int blk_get_max_iov(BlockBackend *blk);
+int blk_get_max_hw_iov(BlockBackend *blk);
 void blk_set_guest_block_size(BlockBackend *blk, int align);
 void *blk_try_blockalign(BlockBackend *blk, size_t size);
 void *blk_blockalign(BlockBackend *blk, size_t size);
