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lib/bdev: merge buffer allocation in get_buf/put_buf

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These two paths do the same thing, only spdk_bdev_io_get_buf tries to
allocate the buffer directly, while spdk_bdev_io_put_buf reuses the
returned buffer for one of the waiting requests.

Change-Id: I341a011f3a16a99de399c8b56fa73ccd9c7fe4fa
Signed-off-by: Konrad Sztyber <konrad.sztyber@intel.com>
Reviewed-on: https://review.gerrithub.io/c/spdk/spdk/+/451466
Tested-by: SPDK CI Jenkins <sys_sgci@intel.com>
Reviewed-by: Shuhei Matsumoto <shuhei.matsumoto.xt@hitachi.com>
Reviewed-by: Paul Luse <paul.e.luse@intel.com>
Reviewed-by: Jim Harris <james.r.harris@intel.com>
Reviewed-by: Tomasz Zawadzki <tomasz.zawadzki@intel.com>
This commit is contained in:
Konrad Sztyber 2019-04-15 17:07:18 +02:00 committed by Jim Harris
parent 598ba408a2
commit 2fac8bc76b
1 changed files with 28 additions and 33 deletions
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61
lib/bdev/bdev.c
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@ -514,17 +514,37 @@ _bdev_io_set_bounce_buf(struct spdk_bdev_io *bdev_io, void *buf, size_t len)
}
}
static void
_bdev_io_set_buf(struct spdk_bdev_io *bdev_io, void *buf, uint64_t len)
{
struct spdk_bdev *bdev = bdev_io->bdev;
bool buf_allocated;
uint64_t alignment;
void *aligned_buf;
alignment = spdk_bdev_get_buf_align(bdev);
buf_allocated = _is_buf_allocated(bdev_io->u.bdev.iovs);
aligned_buf = (void *)(((uintptr_t)buf + (alignment - 1)) & ~(alignment - 1));
if (buf_allocated) {
_bdev_io_set_bounce_buf(bdev_io, aligned_buf, len);
} else {
spdk_bdev_io_set_buf(bdev_io, aligned_buf, len);
}
bdev_io->internal.buf = buf;
bdev_io->internal.get_buf_cb(bdev_io->internal.ch->channel, bdev_io, true);
}
static void
spdk_bdev_io_put_buf(struct spdk_bdev_io *bdev_io)
{
struct spdk_mempool *pool;
struct spdk_bdev_io *tmp;
void *buf, *aligned_buf;
bdev_io_stailq_t *stailq;
struct spdk_bdev_mgmt_channel *ch;
uint64_t buf_len;
uint64_t alignment;
bool buf_allocated;
uint64_t buf_len, alignment;
void *buf;
buf = bdev_io->internal.buf;
buf_len = bdev_io->internal.buf_len;
@ -546,21 +566,8 @@ spdk_bdev_io_put_buf(struct spdk_bdev_io *bdev_io)
spdk_mempool_put(pool, buf);
} else {
tmp = STAILQ_FIRST(stailq);
alignment = spdk_bdev_get_buf_align(tmp->bdev);
buf_allocated = _is_buf_allocated(tmp->u.bdev.iovs);
aligned_buf = (void *)(((uintptr_t)buf +
(alignment - 1)) & ~(alignment - 1));
if (buf_allocated) {
_bdev_io_set_bounce_buf(tmp, aligned_buf, tmp->internal.buf_len);
} else {
spdk_bdev_io_set_buf(tmp, aligned_buf, tmp->internal.buf_len);
}
STAILQ_REMOVE_HEAD(stailq, internal.buf_link);
tmp->internal.buf = buf;
tmp->internal.get_buf_cb(tmp->internal.ch->channel, tmp, true);
_bdev_io_set_buf(tmp, buf, tmp->internal.buf_len);
}
}
@ -588,17 +595,14 @@ spdk_bdev_io_get_buf(struct spdk_bdev_io *bdev_io, spdk_bdev_io_get_buf_cb cb, u
{
struct spdk_mempool *pool;
bdev_io_stailq_t *stailq;
void *buf, *aligned_buf;
struct spdk_bdev_mgmt_channel *mgmt_ch;
uint64_t alignment;
bool buf_allocated;
void *buf;
assert(cb != NULL);
alignment = spdk_bdev_get_buf_align(bdev_io->bdev);
buf_allocated = _is_buf_allocated(bdev_io->u.bdev.iovs);
if (buf_allocated &&
if (_is_buf_allocated(bdev_io->u.bdev.iovs) &&
_are_iovs_aligned(bdev_io->u.bdev.iovs, bdev_io->u.bdev.iovcnt, alignment)) {
/* Buffer already present and aligned */
cb(bdev_io->internal.ch->channel, bdev_io, true);
@ -628,19 +632,10 @@ spdk_bdev_io_get_buf(struct spdk_bdev_io *bdev_io, spdk_bdev_io_get_buf_cb cb, u
}
buf = spdk_mempool_get(pool);
if (!buf) {
STAILQ_INSERT_TAIL(stailq, bdev_io, internal.buf_link);
} else {
aligned_buf = (void *)(((uintptr_t)buf + (alignment - 1)) & ~(alignment - 1));
if (buf_allocated) {
_bdev_io_set_bounce_buf(bdev_io, aligned_buf, len);
} else {
spdk_bdev_io_set_buf(bdev_io, aligned_buf, len);
}
bdev_io->internal.buf = buf;
bdev_io->internal.get_buf_cb(bdev_io->internal.ch->channel, bdev_io, true);
_bdev_io_set_buf(bdev_io, buf, len);
}
}