[dpdk-dev] [PATCH v2 2/2] bitmap: modify bitmap not empty API for 128B cacheline

[Nithin Dabilpuram <ndabilpuram@marvell.com>]

Currently bitmap line not empty check API assumes cache line
of 64B and only checks 8 slabs. Since in 128B cacheline, we
have 16 slabs per cacheline, rte_bitmap_clear() will mark
complete line as empty as soon as 8 slabs are empty thereby
breaking bitmap scan functionality. Fix it by defining new
__rte_bitmap_line_not_empty() for 128B cacheline platform.

Signed-off-by: Nithin Dabilpuram <ndabilpuram@marvell.com>
Acked-by: Cristian Dumitrescu <cristian.dumitrescu@intel.com>
---

v2:
- Fix issue with commit message and add acked-by from Cristian.

 lib/librte_eal/include/rte_bitmap.h | 25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)

diff --git a/lib/librte_eal/include/rte_bitmap.h b/lib/librte_eal/include/rte_bitmap.h
index 7c90ef3..d9a1b54 100644
--- a/lib/librte_eal/include/rte_bitmap.h
+++ b/lib/librte_eal/include/rte_bitmap.h
@@ -417,6 +417,7 @@ rte_bitmap_set_slab(struct rte_bitmap *bmp, uint32_t pos, uint64_t slab)
 	*slab1 |= 1llu << offset1;
 }
 
+#if RTE_BITMAP_CL_SLAB_SIZE == 8
 static inline uint64_t
 __rte_bitmap_line_not_empty(uint64_t *slab2)
 {
@@ -432,6 +433,30 @@ __rte_bitmap_line_not_empty(uint64_t *slab2)
 	return v1 | v3;
 }
 
+#elif RTE_BITMAP_CL_SLAB_SIZE == 16
+static inline uint64_t
+__rte_bitmap_line_not_empty(uint64_t *slab2)
+{
+	uint64_t v1, v2, v3, v4, v5, v6, v7, v8;
+
+	v1 = slab2[0] | slab2[1];
+	v2 = slab2[2] | slab2[3];
+	v3 = slab2[4] | slab2[5];
+	v4 = slab2[6] | slab2[7];
+	v5 = slab2[8] | slab2[9];
+	v6 = slab2[10] | slab2[11];
+	v7 = slab2[12] | slab2[13];
+	v8 = slab2[14] | slab2[15];
+	v1 |= v2;
+	v3 |= v4;
+	v5 |= v6;
+	v7 |= v8;
+
+	return v1 | v3 | v5 | v7;
+}
+
+#endif
+
 /**
  * Bitmap bit clear
  *
-- 
2.8.4