From 67efb746c492c25fac4d77aa16b808a8aa26089d Mon Sep 17 00:00:00 2001
From: Samuel Thibault <samuel.thibault@ens-lyon.org>
Date: Sun, 19 Feb 2023 22:24:32 +0100
Subject: pfinet: Align packets

The Ethernet header is 14 bytes long, and thus leads to IP header
misalignment. This uses skb_reserve to introduce 2 bytes of padding to
realign IP headers.
---
 pfinet/tunnel.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

(limited to 'pfinet/tunnel.c')

diff --git a/pfinet/tunnel.c b/pfinet/tunnel.c
index e11ab670..b519ebd1 100644
--- a/pfinet/tunnel.c
+++ b/pfinet/tunnel.c
@@ -391,7 +391,8 @@ trivfs_S_io_write (struct trivfs_protid *cred,
   pthread_mutex_lock (&tdev->lock);
 
   pthread_mutex_lock (&net_bh_lock);
-  skb = alloc_skb (datalen, GFP_ATOMIC);
+  skb = alloc_skb (NET_IP_ALIGN + datalen, GFP_ATOMIC);
+  skb_reserve(skb, NET_IP_ALIGN);
   skb->len = datalen;
   skb->dev = &tdev->dev;
 
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