[dpdk-dev] [PATCH 2/3] crypto/qat: optimise check for chained mbufs

[Adam Dybkowski]

From: Fiona Trahe <fiona.trahe at intel.com>

To detect if sgl, use nb_segs > 1, instead of checking for next pointer,
as nb_segs is in first cache-line while next is in second cache-line.

Signed-off-by: Fiona Trahe <fiona.trahe at intel.com>
---
 drivers/crypto/qat/qat_sym.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/crypto/qat/qat_sym.c b/drivers/crypto/qat/qat_sym.c
index cecced66d..25b6dd5f4 100644
--- a/drivers/crypto/qat/qat_sym.c
+++ b/drivers/crypto/qat/qat_sym.c
@@ -428,7 +428,8 @@ qat_sym_build_request(void *in_op, uint8_t *out_msg,
 		min_ofs = op->sym->aead.data.offset;
 	}
 
-	if (op->sym->m_src->next || (op->sym->m_dst && op->sym->m_dst->next))
+	if (op->sym->m_src->nb_segs > 1 ||
+			(op->sym->m_dst && op->sym->m_dst->nb_segs > 1))
 		do_sgl = 1;
 
 	/* adjust for chain case */
-- 
2.17.1