netdev - [PATCH v8 6/7] scsi: libiscsi: use sendpage_ok() in iscsi_tcp_segment

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Date:   Fri, 25 Sep 2020 23:01:18 +0800
From:   Coly Li <colyli@...e.de>
To:     linux-block@...r.kernel.org, linux-nvme@...ts.infradead.org,
        netdev@...r.kernel.org, open-iscsi@...glegroups.com,
        linux-scsi@...r.kernel.org, ceph-devel@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, Coly Li <colyli@...e.de>,
        Vasily Averin <vvs@...tuozzo.com>,
        Cong Wang <amwang@...hat.com>,
        Mike Christie <michaelc@...wisc.edu>,
        Lee Duncan <lduncan@...e.com>, Chris Leech <cleech@...hat.com>,
        Christoph Hellwig <hch@....de>, Hannes Reinecke <hare@...e.de>
Subject: [PATCH v8 6/7] scsi: libiscsi: use sendpage_ok() in iscsi_tcp_segment_map()

In iscsci driver, iscsi_tcp_segment_map() uses the following code to
check whether the page should or not be handled by sendpage:
    if (!recv && page_count(sg_page(sg)) >= 1 && !PageSlab(sg_page(sg)))

The "page_count(sg_page(sg)) >= 1 && !PageSlab(sg_page(sg)" part is to
make sure the page can be sent to network layer's zero copy path. This
part is exactly what sendpage_ok() does.

This patch uses  use sendpage_ok() in iscsi_tcp_segment_map() to replace
the original open coded checks.

Signed-off-by: Coly Li <colyli@...e.de>
Cc: Vasily Averin <vvs@...tuozzo.com>
Cc: Cong Wang <amwang@...hat.com>
Cc: Mike Christie <michaelc@...wisc.edu>
Cc: Lee Duncan <lduncan@...e.com>
Cc: Chris Leech <cleech@...hat.com>
Cc: Christoph Hellwig <hch@....de>
Cc: Hannes Reinecke <hare@...e.de>
---
 drivers/scsi/libiscsi_tcp.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/scsi/libiscsi_tcp.c b/drivers/scsi/libiscsi_tcp.c
index 37e5d4e48c2f..83f14b2c8804 100644
--- a/drivers/scsi/libiscsi_tcp.c
+++ b/drivers/scsi/libiscsi_tcp.c
@@ -128,7 +128,7 @@ static void iscsi_tcp_segment_map(struct iscsi_segment *segment, int recv)
 	 * coalescing neighboring slab objects into a single frag which
 	 * triggers one of hardened usercopy checks.
 	 */
-	if (!recv && page_count(sg_page(sg)) >= 1 && !PageSlab(sg_page(sg)))
+	if (!recv && sendpage_ok(sg_page(sg)))
 		return;
 
 	if (recv) {
-- 
2.26.2