From: Peng Li <lipeng321@huawei.com>
Date: Sat, 10 Mar 2018 11:29:26 +0800
Subject: net: hns3: fix rx path skb->truesize reporting bug
Patch-mainline: v4.17-rc1
Git-commit: f8d291f00bb33c97b8c9dd643277d6300d05559d
References: bsc#1104353 FATE#326415

Original skb->truesize reports the received packet size,
not the actual buffer size NIC driver allocated(1 Page).
The linux net protocol will misjudge the true size of rx queue.

Signed-off-by: Peng Li <lipeng321@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
 drivers/net/ethernet/hisilicon/hns3/hns3_enet.c |   10 ++++------
 1 file changed, 4 insertions(+), 6 deletions(-)

--- a/drivers/net/ethernet/hisilicon/hns3/hns3_enet.c
+++ b/drivers/net/ethernet/hisilicon/hns3/hns3_enet.c
@@ -2058,15 +2058,13 @@ static void hns3_nic_reuse_page(struct s
 	desc = &ring->desc[ring->next_to_clean];
 	size = le16_to_cpu(desc->rx.size);
 
-	if (twobufs) {
-		truesize = hnae_buf_size(ring);
-	} else {
-		truesize = ALIGN(size, L1_CACHE_BYTES);
+	truesize = hnae_buf_size(ring);
+
+	if (!twobufs)
 		last_offset = hnae_page_size(ring) - hnae_buf_size(ring);
-	}
 
 	skb_add_rx_frag(skb, i, desc_cb->priv, desc_cb->page_offset + pull_len,
-			size - pull_len, truesize - pull_len);
+			size - pull_len, truesize);
 
 	 /* Avoid re-using remote pages,flag default unreuse */
 	if (unlikely(page_to_nid(desc_cb->priv) != numa_node_id()))