Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752704Ab3HZWqL (ORCPT ); Mon, 26 Aug 2013 18:46:11 -0400 Received: from mail-ob0-f172.google.com ([209.85.214.172]:43687 "EHLO mail-ob0-f172.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752430Ab3HZWqA (ORCPT ); Mon, 26 Aug 2013 18:46:00 -0400 From: Rob Herring To: netdev@vger.kernel.org, linux-kernel@vger.kernel.org Cc: Andreas Herrmann , Lennert Buytenhek , Rob Herring Subject: [PATCH 08/11] net: calxedaxgmac: fix various errors in xgmac_set_rx_mode Date: Mon, 26 Aug 2013 17:45:23 -0500 Message-Id: <1377557126-10716-8-git-send-email-robherring2@gmail.com> X-Mailer: git-send-email 1.8.1.2 In-Reply-To: <1377557126-10716-1-git-send-email-robherring2@gmail.com> References: <1377557126-10716-1-git-send-email-robherring2@gmail.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 3107 Lines: 77 From: Rob Herring Fix xgmac_set_rx_mode to handle several conditions that were not handled correctly as Lennert Buytenhek describes: If we have, say, 100 unicast addresses, and 5 multicast addresses, the unicast address count check will evaluate to true, and set use_hash to true. The multicast address check will however evaluate to false, and use_hash won't be set to true again, and XGMAC_FRAME_FILTER_HMC won't be OR'd into XGMAC_FRAME_FILTER, but since use_hash was still true from the unicast check, netdev_for_each_mc_addr() will program the multicast addresses into the hash table instead of using the MAC address registers, but since the HMC bit wasn't set, the hash table won't be checked for multicast addresses on receive, and we'll stop receiving multicast packets entirely. Also, there is no code that zeroes out MAC address registers reg..31 at the end of this function, meaning that under the right conditions, unicast/multicast addresses that were previously in the filter but were then deleted won't be cleared out. Reported-by: Lennert Buytenhek Signed-off-by: Rob Herring --- drivers/net/ethernet/calxeda/xgmac.c | 17 +++++++++++++---- 1 file changed, 13 insertions(+), 4 deletions(-) diff --git a/drivers/net/ethernet/calxeda/xgmac.c b/drivers/net/ethernet/calxeda/xgmac.c index 385eca0..9b6eff5 100644 --- a/drivers/net/ethernet/calxeda/xgmac.c +++ b/drivers/net/ethernet/calxeda/xgmac.c @@ -618,10 +618,15 @@ static void xgmac_set_mac_addr(void __iomem *ioaddr, unsigned char *addr, { u32 data; - data = (addr[5] << 8) | addr[4] | (num ? XGMAC_ADDR_AE : 0); - writel(data, ioaddr + XGMAC_ADDR_HIGH(num)); - data = (addr[3] << 24) | (addr[2] << 16) | (addr[1] << 8) | addr[0]; - writel(data, ioaddr + XGMAC_ADDR_LOW(num)); + if (addr) { + data = (addr[5] << 8) | addr[4] | (num ? XGMAC_ADDR_AE : 0); + writel(data, ioaddr + XGMAC_ADDR_HIGH(num)); + data = (addr[3] << 24) | (addr[2] << 16) | (addr[1] << 8) | addr[0]; + writel(data, ioaddr + XGMAC_ADDR_LOW(num)); + } else { + writel(0, ioaddr + XGMAC_ADDR_HIGH(num)); + writel(0, ioaddr + XGMAC_ADDR_LOW(num)); + } } static void xgmac_get_mac_addr(void __iomem *ioaddr, unsigned char *addr, @@ -1297,6 +1302,8 @@ static void xgmac_set_rx_mode(struct net_device *dev) if ((netdev_mc_count(dev) + reg - 1) > XGMAC_MAX_FILTER_ADDR) { use_hash = true; value |= XGMAC_FRAME_FILTER_HMC | XGMAC_FRAME_FILTER_HPF; + } else { + use_hash = false; } netdev_for_each_mc_addr(ha, dev) { if (use_hash) { @@ -1313,6 +1320,8 @@ static void xgmac_set_rx_mode(struct net_device *dev) } out: + for (i = reg; i < XGMAC_MAX_FILTER_ADDR; i++) + xgmac_set_mac_addr(ioaddr, NULL, reg); for (i = 0; i < XGMAC_NUM_HASH; i++) writel(hash_filter[i], ioaddr + XGMAC_HASH(i)); -- 1.8.1.2 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/