From patchwork Thu Sep 18 00:10:36 2014 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: David L Stevens X-Patchwork-Id: 390568 X-Patchwork-Delegate: davem@davemloft.net Return-Path: X-Original-To: patchwork-incoming@ozlabs.org Delivered-To: patchwork-incoming@ozlabs.org Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id 6DC2E140188 for ; Thu, 18 Sep 2014 10:10:44 +1000 (EST) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754079AbaIRAKk (ORCPT ); Wed, 17 Sep 2014 20:10:40 -0400 Received: from userp1040.oracle.com ([156.151.31.81]:47303 "EHLO userp1040.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753894AbaIRAKk (ORCPT ); Wed, 17 Sep 2014 20:10:40 -0400 Received: from ucsinet21.oracle.com (ucsinet21.oracle.com [156.151.31.93]) by userp1040.oracle.com (Sentrion-MTA-4.3.2/Sentrion-MTA-4.3.2) with ESMTP id s8I0Aca0031333 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=OK); Thu, 18 Sep 2014 00:10:39 GMT Received: from aserz7022.oracle.com (aserz7022.oracle.com [141.146.126.231]) by ucsinet21.oracle.com (8.14.4+Sun/8.14.4) with ESMTP id s8I0AbU9028508 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO); Thu, 18 Sep 2014 00:10:38 GMT Received: from abhmp0018.oracle.com (abhmp0018.oracle.com [141.146.116.24]) by aserz7022.oracle.com (8.14.4+Sun/8.14.4) with ESMTP id s8I0AbNR020453; Thu, 18 Sep 2014 00:10:37 GMT Received: from [10.154.186.239] (/10.154.186.239) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Wed, 17 Sep 2014 17:10:36 -0700 Message-ID: <541A22FC.20407@oracle.com> Date: Wed, 17 Sep 2014 20:10:36 -0400 From: David L Stevens Organization: Oracle Corporation User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101 Thunderbird/24.7.0 MIME-Version: 1.0 To: David Miller CC: netdev@vger.kernel.org Subject: [PATCHv6 net-next 2/3] sunvnet: allow admin to set sunvnet MTU X-Source-IP: ucsinet21.oracle.com [156.151.31.93] Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org This patch allows an admin to set the MTU on a sunvnet device to arbitrary values between the minimum (68) and maximum (65535) IPv4 packet sizes. Signed-off-by: David L Stevens --- arch/sparc/kernel/ldc.c | 2 +- drivers/net/ethernet/sun/sunvnet.c | 7 +++++-- drivers/net/ethernet/sun/sunvnet.h | 6 ++++-- 3 files changed, 10 insertions(+), 5 deletions(-) diff --git a/arch/sparc/kernel/ldc.c b/arch/sparc/kernel/ldc.c index 66dacd5..0af28b9 100644 --- a/arch/sparc/kernel/ldc.c +++ b/arch/sparc/kernel/ldc.c @@ -2159,7 +2159,7 @@ int ldc_map_single(struct ldc_channel *lp, state.pte_idx = (base - iommu->page_table); state.nc = 0; fill_cookies(&state, (pa & PAGE_MASK), (pa & ~PAGE_MASK), len); - BUG_ON(state.nc != 1); + BUG_ON(state.nc > ncookies); return state.nc; } diff --git a/drivers/net/ethernet/sun/sunvnet.c b/drivers/net/ethernet/sun/sunvnet.c index a9638c1..5e64e60 100644 --- a/drivers/net/ethernet/sun/sunvnet.c +++ b/drivers/net/ethernet/sun/sunvnet.c @@ -791,6 +791,9 @@ static int vnet_start_xmit(struct sk_buff *skb, struct net_device *dev) if (unlikely(!port)) goto out_dropped; + if (skb->len > port->rmtu) + goto out_dropped; + spin_lock_irqsave(&port->vio.lock, flags); dr = &port->vio.drings[VIO_DRIVER_TX_RING]; @@ -1038,7 +1041,7 @@ static void vnet_set_rx_mode(struct net_device *dev) static int vnet_change_mtu(struct net_device *dev, int new_mtu) { - if (new_mtu != ETH_DATA_LEN) + if (new_mtu < 68 || new_mtu > 65535) return -EINVAL; dev->mtu = new_mtu; @@ -1131,7 +1134,7 @@ static int vnet_port_alloc_tx_bufs(struct vnet_port *port) } err = ldc_map_single(port->vio.lp, buf, map_len, - port->tx_bufs[i].cookies, 2, + port->tx_bufs[i].cookies, VNET_MAXCOOKIES, (LDC_MAP_SHADOW | LDC_MAP_DIRECT | LDC_MAP_RW)); diff --git a/drivers/net/ethernet/sun/sunvnet.h b/drivers/net/ethernet/sun/sunvnet.h index 986e04b..a39a801 100644 --- a/drivers/net/ethernet/sun/sunvnet.h +++ b/drivers/net/ethernet/sun/sunvnet.h @@ -11,7 +11,7 @@ */ #define VNET_TX_TIMEOUT (5 * HZ) -#define VNET_MAXPACKET 1518ULL /* ETH_FRAMELEN + VLAN_HDR */ +#define VNET_MAXPACKET (65535ULL + ETH_HLEN + VLAN_HLEN) #define VNET_TX_RING_SIZE 512 #define VNET_TX_WAKEUP_THRESH(dr) ((dr)->pending / 4) @@ -21,10 +21,12 @@ */ #define VNET_PACKET_SKIP 6 +#define VNET_MAXCOOKIES (VNET_MAXPACKET/PAGE_SIZE + 1) + struct vnet_tx_entry { void *buf; unsigned int ncookies; - struct ldc_trans_cookie cookies[2]; + struct ldc_trans_cookie cookies[VNET_MAXCOOKIES]; }; struct vnet;