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bdev: Simplify get/set/put buf functions

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Also make the iov_len always set to the used length, not
the total length of the buffer.

Change-Id: I7ebb5b63c6ca7570369f4af0131a23c520c1f7b0
Signed-off-by: Ben Walker <benjamin.walker@intel.com>
Reviewed-on: https://review.gerrithub.io/419025
Chandler-Test-Pool: SPDK Automated Test System <sys_sgsw@intel.com>
Tested-by: SPDK CI Jenkins <sys_sgci@intel.com>
Reviewed-by: Maciej Szwed <maciej.szwed@intel.com>
Reviewed-by: Dariusz Stojaczyk <dariuszx.stojaczyk@intel.com>
Reviewed-by: Jim Harris <james.r.harris@intel.com>
Reviewed-by: Shuhei Matsumoto <shuhei.matsumoto.xt@hitachi.com>
This commit is contained in:
Ben Walker 2018-07-11 13:48:53 -07:00 committed by Jim Harris
parent 37e6827a85
commit 844aedf8ad
2 changed files with 18 additions and 49 deletions
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3
include/spdk/bdev_module.h
View File

@ -616,9 +616,8 @@ void spdk_bdev_io_get_buf(struct spdk_bdev_io *bdev_io, spdk_bdev_io_get_buf_cb
* \param buf The buffer to set as the active data buffer.
* \param len The length of the buffer.
*
* \return The usable size of the buffer, after adjustments of alignment.
*/
size_t spdk_bdev_io_set_buf(struct spdk_bdev_io *bdev_io, void *buf, size_t len);
void spdk_bdev_io_set_buf(struct spdk_bdev_io *bdev_io, void *buf, size_t len);
/**
* Complete a bdev_io

64
lib/bdev/bdev.c
View File

@ -377,33 +377,18 @@ spdk_bdev_get_by_name(const char *bdev_name)
return NULL;
}
size_t
void
spdk_bdev_io_set_buf(struct spdk_bdev_io *bdev_io, void *buf, size_t len)
{
struct iovec **iovs;
int *iovcnt;
void *aligned_buf;
struct iovec *iovs;
iovs = &bdev_io->u.bdev.iovs;
iovcnt = &bdev_io->u.bdev.iovcnt;
iovs = bdev_io->u.bdev.iovs;
if (*iovs == NULL || *iovcnt == 0) {
*iovs = &bdev_io->iov;
*iovcnt = 1;
}
assert(iovs != NULL);
assert(bdev_io->u.bdev.iovcnt >= 1);
if (buf != NULL) {
aligned_buf = (void *)(((uintptr_t)buf + 511) & ~511UL);
len = len - ((uintptr_t)aligned_buf - (uintptr_t)buf);
} else {
aligned_buf = NULL;
assert(len == 0);
}
(*iovs)[0].iov_base = aligned_buf;
(*iovs)[0].iov_len = len;
return len;
iovs[0].iov_base = buf;
iovs[0].iov_len = len;
}
static void
@ -411,38 +396,34 @@ spdk_bdev_io_put_buf(struct spdk_bdev_io *bdev_io)
{
struct spdk_mempool *pool;
struct spdk_bdev_io *tmp;
void *buf;
void *buf, *aligned_buf;
bdev_io_stailq_t *stailq;
struct spdk_bdev_mgmt_channel *ch;
size_t len;
assert(bdev_io->u.bdev.iovcnt == 1);
buf = bdev_io->internal.buf;
ch = bdev_io->internal.ch->shared_resource->mgmt_ch;
bdev_io->internal.buf = NULL;
if (bdev_io->internal.buf_len <= SPDK_BDEV_SMALL_BUF_MAX_SIZE) {
pool = g_bdev_mgr.buf_small_pool;
stailq = &ch->need_buf_small;
len = SPDK_BDEV_SMALL_BUF_MAX_SIZE + 512;
} else {
pool = g_bdev_mgr.buf_large_pool;
stailq = &ch->need_buf_large;
len = SPDK_BDEV_LARGE_BUF_MAX_SIZE + 512;
}
if (STAILQ_EMPTY(stailq)) {
spdk_mempool_put(pool, buf);
} else {
tmp = STAILQ_FIRST(stailq);
aligned_buf = (void *)(((uintptr_t)buf + 511) & ~511UL);
spdk_bdev_io_set_buf(bdev_io, aligned_buf, tmp->internal.buf_len);
STAILQ_REMOVE_HEAD(stailq, internal.buf_link);
len = spdk_bdev_io_set_buf(tmp, buf, len);
if (len < tmp->internal.buf_len) {
SPDK_ERRLOG("Unable to use buffer due to alignment\n");
spdk_mempool_put(pool, buf);
spdk_bdev_io_set_buf(tmp, NULL, 0);
return;
}
tmp->internal.buf = buf;
tmp->internal.get_buf_cb(tmp->internal.ch->channel, tmp);
}
@ -453,9 +434,8 @@ 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 = NULL;
void *buf, *aligned_buf;
struct spdk_bdev_mgmt_channel *mgmt_ch;
size_t buf_len;
assert(cb != NULL);
assert(bdev_io->u.bdev.iovs != NULL);
@ -474,11 +454,9 @@ spdk_bdev_io_get_buf(struct spdk_bdev_io *bdev_io, spdk_bdev_io_get_buf_cb cb, u
if (len <= SPDK_BDEV_SMALL_BUF_MAX_SIZE) {
pool = g_bdev_mgr.buf_small_pool;
stailq = &mgmt_ch->need_buf_small;
buf_len = SPDK_BDEV_SMALL_BUF_MAX_SIZE + 512;
} else {
pool = g_bdev_mgr.buf_large_pool;
stailq = &mgmt_ch->need_buf_large;
buf_len = SPDK_BDEV_LARGE_BUF_MAX_SIZE + 512;
}
buf = spdk_mempool_get(pool);
@ -486,16 +464,8 @@ spdk_bdev_io_get_buf(struct spdk_bdev_io *bdev_io, spdk_bdev_io_get_buf_cb cb, u
if (!buf) {
STAILQ_INSERT_TAIL(stailq, bdev_io, internal.buf_link);
} else {
size_t aligned_len;
aligned_len = spdk_bdev_io_set_buf(bdev_io, buf, buf_len);
if (aligned_len < len) {
SPDK_ERRLOG("Unable to use buffer after alignment calculations.\n");
spdk_mempool_put(pool, buf);
spdk_bdev_io_set_buf(bdev_io, NULL, 0);
STAILQ_INSERT_TAIL(stailq, bdev_io, internal.buf_link);
return;
}
aligned_buf = (void *)(((uintptr_t)buf + 511) & ~511UL);
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);