From: Volodymyr Fialko <vfialko@marvell.com>
To: <dev@dpdk.org>, <cristian.dumitrescu@intel.com>
Cc: <jerinj@marvell.com>, <anoobj@marvell.com>, <thomas@monjalon.net>,
Volodymyr Fialko <vfialko@marvell.com>
Subject: [PATCH v5] bitmap: add scan from offset function
Date: Mon, 3 Jul 2023 14:39:08 +0200 [thread overview]
Message-ID: <20230703123909.328480-1-vfialko@marvell.com> (raw)
In-Reply-To: <20230703093130.198304-1-vfialko@marvell.com>
Currently, in the case when we search for a bit set after a particular
value, the bitmap has to be scanned from the beginning and
rte_bitmap_scan() has to be called multiple times until we hit the value.
Add a new rte_bitmap_scan_from_offset() function to initialize scan
state at the given offset and perform scan, this will allow getting
the next set bit after certain offset within one scan call.
Signed-off-by: Volodymyr Fialko <vfialko@marvell.com>
---
v2:
- added rte_bitmap_scan_from_offset
v3:
- added note for internal use only for init_at function
v4:
- marked init_at function as __rte_internal
v5:
- removed __rte_internal due to build errors
app/test/test_bitmap.c | 33 +++++++++++++++++++++-
lib/eal/include/rte_bitmap.h | 55 ++++++++++++++++++++++++++++++++++++
2 files changed, 87 insertions(+), 1 deletion(-)
diff --git a/app/test/test_bitmap.c b/app/test/test_bitmap.c
index e9c61590ae..9e38087408 100644
--- a/app/test/test_bitmap.c
+++ b/app/test/test_bitmap.c
@@ -18,8 +18,8 @@ test_bitmap_scan_operations(struct rte_bitmap *bmp)
{
uint64_t slab1_magic = 0xBADC0FFEEBADF00D;
uint64_t slab2_magic = 0xFEEDDEADDEADF00D;
+ int i, nb_clear, nb_set, next_cl;
uint32_t pos = 0, start_pos;
- int i, nb_clear, nb_set;
uint64_t out_slab = 0;
rte_bitmap_reset(bmp);
@@ -71,6 +71,37 @@ test_bitmap_scan_operations(struct rte_bitmap *bmp)
return TEST_FAILED;
}
+ /* Scan with offset check. */
+ if (!rte_bitmap_scan_from_offset(bmp, RTE_BITMAP_SLAB_BIT_SIZE, &pos, &out_slab)) {
+ printf("Failed to get slab from bitmap with scan from offset.\n");
+ return TEST_FAILED;
+ }
+
+ if (slab2_magic != out_slab) {
+ printf("Scan from offset operation failed.\n");
+ return TEST_FAILED;
+ }
+
+ /* Scan with offset wrap around check. */
+ if (!rte_bitmap_scan_from_offset(bmp, 2 * RTE_BITMAP_SLAB_BIT_SIZE, &pos, &out_slab)) {
+ printf("Failed to get slab from bitmap with scan from offset.\n");
+ return TEST_FAILED;
+ }
+
+ if (slab1_magic != out_slab) {
+ printf("Scan from offset with wrap around operation failed.\n");
+ return TEST_FAILED;
+ }
+
+ /* Test scan when the bit set is on a next cline */
+ rte_bitmap_reset(bmp);
+ next_cl = RTE_MIN(RTE_BITMAP_CL_BIT_SIZE, MAX_BITS);
+ rte_bitmap_set(bmp, next_cl);
+ if (!rte_bitmap_scan_from_offset(bmp, 0, &pos, &out_slab)) {
+ printf("Failed to get slab from next cache line from bitmap.\n");
+ return TEST_FAILED;
+ }
+
/* Test scan when a cline is half full */
rte_bitmap_reset(bmp);
for (i = 0; i < MAX_BITS; i++)
diff --git a/lib/eal/include/rte_bitmap.h b/lib/eal/include/rte_bitmap.h
index 27ee3d18a4..cc14b1ed2e 100644
--- a/lib/eal/include/rte_bitmap.h
+++ b/lib/eal/include/rte_bitmap.h
@@ -137,6 +137,29 @@ __rte_bitmap_scan_init(struct rte_bitmap *bmp)
bmp->go2 = 0;
}
+/**
+ * Bitmap initialize internal scan pointers at the given position for the scan function.
+ *
+ * Note: for private/internal use, for public:
+ * @see rte_bitmap_scan_from_offset()
+ *
+ * @param bmp
+ * Handle to bitmap instance
+ * @param pos
+ * Bit position to start scan
+ */
+static inline void
+__rte_bitmap_scan_init_at(struct rte_bitmap *bmp, uint32_t pos)
+{
+ uint64_t *slab1;
+
+ bmp->index1 = pos >> (RTE_BITMAP_SLAB_BIT_SIZE_LOG2 + RTE_BITMAP_CL_BIT_SIZE_LOG2);
+ bmp->offset1 = (pos >> RTE_BITMAP_CL_BIT_SIZE_LOG2) & RTE_BITMAP_SLAB_BIT_MASK;
+ bmp->index2 = pos >> RTE_BITMAP_SLAB_BIT_SIZE_LOG2;
+ slab1 = bmp->array1 + bmp->index1;
+ bmp->go2 = *slab1 & (1llu << bmp->offset1);
+}
+
/**
* Bitmap memory footprint calculation
*
@@ -591,6 +614,38 @@ rte_bitmap_scan(struct rte_bitmap *bmp, uint32_t *pos, uint64_t *slab)
return 0;
}
+/**
+ * @warning
+ * @b EXPERIMENTAL: this API may change without prior notice.
+ *
+ * Bitmap scan from the given offset.
+ * Function will reset internal scan state to start scanning from the offset
+ * position.
+ * @see rte_bitmap_scan()
+ *
+ * @param bmp
+ * Handle to bitmap instance
+ * @param offset
+ * Bit offset to start scan
+ * @param pos
+ * When function call returns 1, pos contains the position of the next set
+ * bit, otherwise not modified
+ * @param slab
+ * When function call returns 1, slab contains the value of the entire 64-bit
+ * slab where the bit indicated by pos is located.
+ * When function call returns 0, slab is not modified.
+ * @return
+ * 0 if there is no bit set in the bitmap, 1 otherwise
+ */
+__rte_experimental
+static inline int
+rte_bitmap_scan_from_offset(struct rte_bitmap *bmp, uint32_t offset,
+ uint32_t *pos, uint64_t *slab)
+{
+ __rte_bitmap_scan_init_at(bmp, offset);
+ return rte_bitmap_scan(bmp, pos, slab);
+}
+
#ifdef __cplusplus
}
#endif
--
2.34.1
next prev parent reply other threads:[~2023-07-03 12:39 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-04-14 8:39 [PATCH] bitmap: add scan init at given position Volodymyr Fialko
2023-06-01 15:26 ` Thomas Monjalon
2023-06-08 14:20 ` Dumitrescu, Cristian
2023-06-08 14:50 ` Bruce Richardson
2023-06-12 10:58 ` Volodymyr Fialko
2023-06-13 15:40 ` [PATCH v2] bitmap: add scan from offset function Volodymyr Fialko
2023-06-19 11:30 ` Dumitrescu, Cristian
2023-06-21 10:01 ` [PATCH v3] " Volodymyr Fialko
2023-06-21 10:37 ` Dumitrescu, Cristian
2023-06-22 17:44 ` Thomas Monjalon
2023-06-23 12:40 ` Dumitrescu, Cristian
2023-07-03 10:56 ` Volodymyr Fialko
2023-07-03 11:51 ` Thomas Monjalon
2023-07-03 12:02 ` [EXT] " Volodymyr Fialko
2023-07-03 12:17 ` Thomas Monjalon
2023-07-03 9:31 ` [PATCH v4] " Volodymyr Fialko
2023-07-03 10:54 ` Dumitrescu, Cristian
2023-07-03 12:39 ` Volodymyr Fialko [this message]
2023-07-03 13:01 ` [PATCH v5] " Dumitrescu, Cristian
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20230703123909.328480-1-vfialko@marvell.com \
--to=vfialko@marvell.com \
--cc=anoobj@marvell.com \
--cc=cristian.dumitrescu@intel.com \
--cc=dev@dpdk.org \
--cc=jerinj@marvell.com \
--cc=thomas@monjalon.net \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).