On Tue, Mar 24, 2009 at 6:08 PM, Joakim Tjernlund <joakim.tjernl...@transmode.se> wrote:
> + .ndo_change_mtu = eth_change_mtu, 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 _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@ozlabs.org https://ozlabs.org/mailman/listinfo/linuxppc-dev