From: Fiona Trahe <fiona.trahe@intel.com>
Date: Wed, 11 Mar 2020 12:26:07 +0000 (+0100)
Subject: crypto/qat: optimise check for chained mbufs
X-Git-Url: http://git.droids-corp.org/?a=commitdiff_plain;h=603ad3ae915efff712d19875c8c7eb33fb71f0df;p=dpdk.git

crypto/qat: optimise check for chained mbufs

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@intel.com>
Acked-by: Arek Kusztal <arkadiuszx.kusztal@intel.com>
---

diff --git a/drivers/crypto/qat/qat_sym.c b/drivers/crypto/qat/qat_sym.c
index cecced66d1..25b6dd5f47 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 */