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From: Sven Eckelmann <sven@narfation.org>
To: stable@vger.kernel.org
Cc: b.a.t.m.a.n@lists.open-mesh.org,
	Sven Eckelmann <sven@narfation.org>,
	Simon Wunderlich <sw@simonwunderlich.de>
Subject: [PATCH 4.14 4/5] batman-adv: Reserve needed_*room for fragments
Date: Sat, 20 Nov 2021 13:40:17 +0100	[thread overview]
Message-ID: <20211120124018.260907-5-sven@narfation.org> (raw)
In-Reply-To: <20211120124018.260907-1-sven@narfation.org>

commit c5cbfc87558168ef4c3c27ce36eba6b83391db19 upstream.

The batadv net_device is trying to propagate the needed_headroom and
needed_tailroom from the lower devices. This is needed to avoid cost
intensive reallocations using pskb_expand_head during the transmission.

But the fragmentation code split the skb's without adding extra room at the
end/beginning of the various fragments. This reduced the performance of
transmissions over complex scenarios (batadv on vxlan on wireguard) because
the lower devices had to perform the reallocations at least once.

Fixes: ee75ed88879a ("batman-adv: Fragment and send skbs larger than mtu")
Signed-off-by: Sven Eckelmann <sven@narfation.org>
Signed-off-by: Simon Wunderlich <sw@simonwunderlich.de>
[ bp: 4.14 backported: adjust context. ]
Signed-off-by: Sven Eckelmann <sven@narfation.org>
 net/batman-adv/fragmentation.c | 15 ++++++++++-----
 1 file changed, 10 insertions(+), 5 deletions(-)

diff --git a/net/batman-adv/fragmentation.c b/net/batman-adv/fragmentation.c
index 788d62073964..f1446a04f055 100644
--- a/net/batman-adv/fragmentation.c
+++ b/net/batman-adv/fragmentation.c
@@ -402,6 +402,7 @@ bool batadv_frag_skb_fwd(struct sk_buff *skb,
  * batadv_frag_create - create a fragment from skb
+ * @net_dev: outgoing device for fragment
  * @skb: skb to create fragment from
  * @frag_head: header to use in new fragment
  * @fragment_size: size of new fragment
@@ -412,22 +413,25 @@ bool batadv_frag_skb_fwd(struct sk_buff *skb,
  * Return: the new fragment, NULL on error.
-static struct sk_buff *batadv_frag_create(struct sk_buff *skb,
+static struct sk_buff *batadv_frag_create(struct net_device *net_dev,
+					  struct sk_buff *skb,
 					  struct batadv_frag_packet *frag_head,
 					  unsigned int fragment_size)
+	unsigned int ll_reserved = LL_RESERVED_SPACE(net_dev);
+	unsigned int tailroom = net_dev->needed_tailroom;
 	struct sk_buff *skb_fragment;
 	unsigned int header_size = sizeof(*frag_head);
 	unsigned int mtu = fragment_size + header_size;
-	skb_fragment = netdev_alloc_skb(NULL, mtu + ETH_HLEN);
+	skb_fragment = dev_alloc_skb(ll_reserved + mtu + tailroom);
 	if (!skb_fragment)
 		goto err;
 	skb_fragment->priority = skb->priority;
 	/* Eat the last mtu-bytes of the skb */
-	skb_reserve(skb_fragment, header_size + ETH_HLEN);
+	skb_reserve(skb_fragment, ll_reserved + header_size);
 	skb_split(skb, skb_fragment, skb->len - fragment_size);
 	/* Add the header */
@@ -450,11 +454,12 @@ int batadv_frag_send_packet(struct sk_buff *skb,
 			    struct batadv_orig_node *orig_node,
 			    struct batadv_neigh_node *neigh_node)
+	struct net_device *net_dev = neigh_node->if_incoming->net_dev;
 	struct batadv_priv *bat_priv;
 	struct batadv_hard_iface *primary_if = NULL;
 	struct batadv_frag_packet frag_header;
 	struct sk_buff *skb_fragment;
-	unsigned int mtu = neigh_node->if_incoming->net_dev->mtu;
+	unsigned int mtu = net_dev->mtu;
 	unsigned int header_size = sizeof(frag_header);
 	unsigned int max_fragment_size, num_fragments;
 	int ret;
@@ -514,7 +519,7 @@ int batadv_frag_send_packet(struct sk_buff *skb,
 			goto put_primary_if;
-		skb_fragment = batadv_frag_create(skb, &frag_header,
+		skb_fragment = batadv_frag_create(net_dev, skb, &frag_header,
 		if (!skb_fragment) {
 			ret = -ENOMEM;

  parent reply	other threads:[~2021-11-20 12:40 UTC|newest]

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-11-20 12:40 [PATCH 4.14 0/5] batman-adv: Fixes for stable/linux-4.14.y Sven Eckelmann
2021-11-20 12:40 ` [PATCH 4.14 1/5] batman-adv: mcast: fix duplicate mcast packets in BLA backbone from LAN Sven Eckelmann
2021-11-23 12:38   ` Patch "batman-adv: mcast: fix duplicate mcast packets in BLA backbone from LAN" has been added to the 4.14-stable tree gregkh
2021-11-20 12:40 ` [PATCH 4.14 2/5] batman-adv: mcast: fix duplicate mcast packets from BLA backbone to mesh Sven Eckelmann
2021-11-23 12:38   ` Patch "batman-adv: mcast: fix duplicate mcast packets from BLA backbone to mesh" has been added to the 4.14-stable tree gregkh
2021-11-20 12:40 ` [PATCH 4.14 3/5] batman-adv: Consider fragmentation for needed_headroom Sven Eckelmann
2021-11-23 12:38   ` Patch "batman-adv: Consider fragmentation for needed_headroom" has been added to the 4.14-stable tree gregkh
2021-11-20 12:40 ` Sven Eckelmann [this message]
2021-11-23 12:38   ` Patch "batman-adv: Reserve needed_*room for fragments" " gregkh
2021-11-20 12:40 ` [PATCH 4.14 5/5] batman-adv: Don't always reallocate the fragmentation skb head Sven Eckelmann
2021-11-23 12:38   ` Patch "batman-adv: Don't always reallocate the fragmentation skb head" has been added to the 4.14-stable tree gregkh

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