diff options
| author | Mike Christie <mchristi@redhat.com> | 2017-11-28 12:40:38 -0600 |
|---|---|---|
| committer | Nicholas Bellinger <nab@linux-iscsi.org> | 2018-01-12 15:07:18 -0800 |
| commit | f890f5799a6628fe006ae524e625900186074cdb (patch) | |
| tree | 92037aa47ad752385e0b66328e5911bbf3fb4ad0 /drivers/target | |
| parent | 6fd0ce79724dabe2cd0bd8aed111cbe94755bf88 (diff) | |
| download | linux-f890f5799a6628fe006ae524e625900186074cdb.tar.bz2 | |
tcmu: simplify dbi thresh handling
We do not really save a lot by trying to increase thresh
a multiple of the existing value. This just simplifies the
code by increasing it to whatever is needed for the command
being executed.
Signed-off-by: Mike Christie <mchristi@redhat.com>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
Diffstat (limited to 'drivers/target')
| -rw-r--r-- | drivers/target/target_core_user.c | 22 |
1 files changed, 3 insertions, 19 deletions
diff --git a/drivers/target/target_core_user.c b/drivers/target/target_core_user.c index 68d1d7214eeb..2679e4dcd0f1 100644 --- a/drivers/target/target_core_user.c +++ b/drivers/target/target_core_user.c @@ -79,7 +79,6 @@ #define DATA_BLOCK_SIZE PAGE_SIZE #define DATA_BLOCK_BITS (256 * 1024) #define DATA_SIZE (DATA_BLOCK_BITS * DATA_BLOCK_SIZE) -#define DATA_BLOCK_INIT_BITS 128 /* The total size of the ring is 8M + 256K * PAGE_SIZE */ #define TCMU_RING_SIZE (CMDR_SIZE + DATA_SIZE) @@ -700,7 +699,6 @@ static bool is_ring_space_avail(struct tcmu_dev *udev, struct tcmu_cmd *cmd, if ((space * DATA_BLOCK_SIZE) < data_needed) { unsigned long blocks_left = DATA_BLOCK_BITS - udev->dbi_thresh + space; - unsigned long grow; if (blocks_left < blocks_needed) { pr_debug("no data space: only %lu available, but ask for %zu\n", @@ -709,23 +707,9 @@ static bool is_ring_space_avail(struct tcmu_dev *udev, struct tcmu_cmd *cmd, return false; } - /* Try to expand the thresh */ - if (!udev->dbi_thresh) { - /* From idle state */ - uint32_t init_thresh = DATA_BLOCK_INIT_BITS; - - udev->dbi_thresh = max(blocks_needed, init_thresh); - } else { - /* - * Grow the data area by max(blocks needed, - * dbi_thresh / 2), but limited to the max - * DATA_BLOCK_BITS size. - */ - grow = max(blocks_needed, udev->dbi_thresh / 2); - udev->dbi_thresh += grow; - if (udev->dbi_thresh > DATA_BLOCK_BITS) - udev->dbi_thresh = DATA_BLOCK_BITS; - } + udev->dbi_thresh += blocks_needed; + if (udev->dbi_thresh > DATA_BLOCK_BITS) + udev->dbi_thresh = DATA_BLOCK_BITS; } return tcmu_get_empty_blocks(udev, cmd); |