[Precise][PATCH] bonding: Bonding driver does not consider the gso_max_size/gso_max_segs setting of slave devices.

[Jesse Sung]

From: Sarveshwar Bandi <sarveshwar.bandi at emulex.com>

BugLink: https://launchpad.net/bugs/1078184

Patch sets the lowest gso_max_size and gso_max_segs values of the slave devices during enslave and detach.

Signed-off-by: Sarveshwar Bandi <sarveshwar.bandi at emulex.com>
Acked-by: Eric Dumazet <edumazet at google.com>
Signed-off-by: David S. Miller <davem at davemloft.net>
(cherry picked from commit 0e376bd0b791ac6ac6bdb051492df0769c840848)

Signed-off-by: Wen-chien Jesse Sung <jesse.sung at canonical.com>
---
 drivers/net/bonding/bond_main.c |    7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c
index 6c284d1..202ae34 100644
--- a/drivers/net/bonding/bond_main.c
+++ b/drivers/net/bonding/bond_main.c
@@ -1366,6 +1366,8 @@ static void bond_compute_features(struct bonding *bond)
 	struct net_device *bond_dev = bond->dev;
 	u32 vlan_features = BOND_VLAN_FEATURES;
 	unsigned short max_hard_header_len = ETH_HLEN;
+	unsigned int gso_max_size = GSO_MAX_SIZE;
+	u16 gso_max_segs = GSO_MAX_SEGS;
 	int i;
 
 	read_lock(&bond->lock);
@@ -1379,11 +1381,16 @@ static void bond_compute_features(struct bonding *bond)
 
 		if (slave->dev->hard_header_len > max_hard_header_len)
 			max_hard_header_len = slave->dev->hard_header_len;
+
+		gso_max_size = min(gso_max_size, slave->dev->gso_max_size);
+		gso_max_segs = min(gso_max_segs, slave->dev->gso_max_segs);
 	}
 
 done:
 	bond_dev->vlan_features = vlan_features;
 	bond_dev->hard_header_len = max_hard_header_len;
+	bond_dev->gso_max_segs = gso_max_segs;
+	netif_set_gso_max_size(bond_dev, gso_max_size);
 
 	read_unlock(&bond->lock);
 
-- 
1.7.10.4