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[RFC,3/3] batman-adv: Add support for jumbo frames

Message ID 20230727-jumbo-mtu-v1-3-036ce1a6e33c@narfation.org (mailing list archive)
State RFC
Delegated to: Simon Wunderlich
Headers
Series batman-adv: Enable support for jumbo frames |

Commit Message

Sven Eckelmann July 27, 2023, 8:13 a.m. UTC 
  Since batman-adv is not actually depending on hardware capabilities, it has
no limit on the MTU. Only the lower hard interfaces can limit it. In case
these have an high enough MTU or fragmentation is enabled, a higher MTU
than 1500 can be enabled.

Signed-off-by: Sven Eckelmann <sven@narfation.org>
---
 net/batman-adv/hard-interface.c | 4 +---
 net/batman-adv/main.h           | 2 ++
 net/batman-adv/soft-interface.c | 3 ++-
 3 files changed, 5 insertions(+), 4 deletions(-)
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Patch

diff --git a/net/batman-adv/hard-interface.c b/net/batman-adv/hard-interface.c
index 5a4ff9a8..4fbb6339 100644
--- a/net/batman-adv/hard-interface.c
+++ b/net/batman-adv/hard-interface.c
@@ -618,10 +618,8 @@  int batadv_hardif_min_mtu(struct net_device *soft_iface)
 
 	/* the real soft-interface MTU is computed by removing the payload
 	 * overhead from the maximum amount of bytes that was just computed.
-	 *
-	 * However batman-adv does not support MTUs bigger than ETH_DATA_LEN
 	 */
-	return min_t(int, min_mtu - batadv_max_header_len(), ETH_DATA_LEN);
+	return min_t(int, min_mtu - batadv_max_header_len(), BATADV_MAX_MTU);
 }
 
 /**
diff --git a/net/batman-adv/main.h b/net/batman-adv/main.h
index e0d53273..4dc81ddb 100644
--- a/net/batman-adv/main.h
+++ b/net/batman-adv/main.h
@@ -22,6 +22,8 @@ 
 #define BATADV_THROUGHPUT_MAX_VALUE 0xFFFFFFFF
 #define BATADV_JITTER 20
 
+#define BATADV_MAX_MTU (ETH_MAX_MTU - batadv_max_header_len())
+
 /* Time To Live of broadcast messages */
 #define BATADV_TTL 50
 
diff --git a/net/batman-adv/soft-interface.c b/net/batman-adv/soft-interface.c
index f7947fad..13d5f993 100644
--- a/net/batman-adv/soft-interface.c
+++ b/net/batman-adv/soft-interface.c
@@ -769,7 +769,7 @@  static int batadv_softif_init_late(struct net_device *dev)
 	atomic_set(&bat_priv->log_level, 0);
 #endif
 	atomic_set(&bat_priv->fragmentation, 1);
-	atomic_set(&bat_priv->packet_size_max, ETH_DATA_LEN);
+	atomic_set(&bat_priv->packet_size_max, BATADV_MAX_MTU);
 	atomic_set(&bat_priv->bcast_queue_left, BATADV_BCAST_QUEUE_LEN);
 	atomic_set(&bat_priv->batman_queue_left, BATADV_BATMAN_QUEUE_LEN);
 
@@ -1009,6 +1009,7 @@  static void batadv_softif_init_early(struct net_device *dev)
 	 * have not been initialized yet
 	 */
 	dev->mtu = ETH_DATA_LEN;
+	dev->max_mtu = BATADV_MAX_MTU;
 
 	/* generate random address */
 	eth_hw_addr_random(dev);