On Tue, Mar 24, 2009 at 6:08 PM, Joakim Tjernlund
<Joakim.Tjernlund@transmode.se> wrote:
I have an old patch for change_mtu support for ucc_geth which I've
been meaning to push upstream. This patch uses this function instead
of eth_change_mtu():
+static int ucc_geth_change_mtu(struct net_device *dev, int new_mtu)
+{
+ int max_rx_buf_length;
+ struct ucc_geth_private *ugeth = netdev_priv(dev);
+ int frame_size = new_mtu + 18;
+ struct ucc_geth_info *ug_info;
+ struct ucc_fast_info *uf_info;
+
+ if (ugeth->p_rx_glbl_pram) {
+ printk("%s: Interface is active!\n", __FUNCTION__);
+ } else {
+
+ ug_info = ugeth->ug_info;
+ uf_info = &ug_info->uf_info;
+
+ if ((frame_size < 64) || (frame_size > JUMBO_FRAME_SIZE)) {
+ printk(KERN_ERR "%s: Invalid MTU setting\n", dev->name);
+ return -EINVAL;
+ }
+
+ max_rx_buf_length =
+ (frame_size & ~(UCC_GETH_MRBLR_ALIGNMENT - 1)) +
+ UCC_GETH_MRBLR_ALIGNMENT;
+
+ ugeth->ug_info->uf_info.max_rx_buf_length = max_rx_buf_length;
+ dev->mtu = new_mtu;
+
+ /* Set the max. rx buffer size (MRBLR) */
+ uf_info->max_rx_buf_length = max_rx_buf_length;
+
+ /* set the max. frame length (MFLR) */
+ ug_info->maxFrameLength = frame_size;
+
+ ugeth_info("%s: MTU = %d (frame size=%d)\n", dev->name,
+ dev->mtu, frame_size);
+ }
+ return 0;
+}
Do you think this is how it should be done? I don't know enough about
ucc_geth and MTUs to know off-hand.
--
Timur Tabi
Linux kernel developer at Freescale
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