app/crypto-perf: fix number of segments

[ upstream commit e03ecc56edd72acb077e2b9bb95ae34f54172a0c ]

When segment size is provided, the total number of segments would be
calculated. Segment size updates due to headroom/tailroom need to be
accounted for when determining total number of segments required.

Fixes: c1670ae ("app/crypto-perf: honour min headroom/tailroom")

Signed-off-by: Anoob Joseph <anoobj@marvell.com>
Signed-off-by: Akhil Goyal <gakhil@marvell.com>

app/test-crypto-perf/cperf_test_common.c

@@ -166,9 +166,11 @@ cperf_alloc_common_memory(const struct cperf_options *options,
 				RTE_CACHE_LINE_ROUNDUP(crypto_op_total_size);
 	uint32_t mbuf_size = sizeof(struct rte_mbuf) + options->segment_sz;
 	uint32_t max_size = options->max_buffer_size + options->digest_sz;
-	uint16_t segments_nb = (max_size % options->segment_sz) ?
-			(max_size / options->segment_sz) + 1 :
-			max_size / options->segment_sz;
+	uint32_t segment_data_len = options->segment_sz - options->headroom_sz -
+				    options->tailroom_sz;
+	uint16_t segments_nb = (max_size % segment_data_len) ?
+				(max_size / segment_data_len) + 1 :
+				(max_size / segment_data_len);
 	uint32_t obj_size = crypto_op_total_size_padded +
 				(mbuf_size * segments_nb);