From mboxrd@z Thu Jan 1 00:00:00 1970 From: Mike McCormack Subject: [PATCH 2/5] sky2: Allocate initial skbs in sky2_alloc_buffers Date: Wed, 10 Feb 2010 23:12:01 +0900 Message-ID: <4B72BEB1.10908@ring3k.org> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Cc: netdev@vger.kernel.org To: Stephen Hemminger Return-path: Received: from mail-pz0-f187.google.com ([209.85.222.187]:55858 "EHLO mail-pz0-f187.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754036Ab0BJORL (ORCPT ); Wed, 10 Feb 2010 09:17:11 -0500 Received: by mail-pz0-f187.google.com with SMTP id 17so24824pzk.4 for ; Wed, 10 Feb 2010 06:17:11 -0800 (PST) Sender: netdev-owner@vger.kernel.org List-ID: Allocate everything in one place so there's a single point of failure in sky2_up, and sky2_rx_start can no longer fail. Don't leave the hardware in a partially initialized state in the case rx ring allocation fails. As with the old code, the rx ring still needs to be fully allocated for sky2_up to succeed. Signed-off-by: Mike McCormack --- drivers/net/sky2.c | 68 +++++++++++++++++++++++++++++----------------------- 1 files changed, 38 insertions(+), 30 deletions(-) diff --git a/drivers/net/sky2.c b/drivers/net/sky2.c index 40c661b..ee091d1 100644 --- a/drivers/net/sky2.c +++ b/drivers/net/sky2.c @@ -1379,8 +1379,34 @@ static inline void sky2_rx_update(struct sky2_port *sky2, unsigned rxq) sky2_put_idx(sky2->hw, rxq, sky2->rx_put); } +static int sky2_alloc_rx_skbs(struct sky2_port *sky2) +{ + struct sky2_hw *hw = sky2->hw; + unsigned i; + + sky2->rx_data_size = sky2_get_rx_data_size(sky2); + + /* Fill Rx ring */ + for (i = 0; i < sky2->rx_pending; i++) { + struct rx_ring_info *re = sky2->rx_ring + i; + + re->skb = sky2_rx_alloc(sky2); + if (!re->skb) + goto nomem; + + if (sky2_rx_map_skb(hw->pdev, re, sky2->rx_data_size)) { + dev_kfree_skb(re->skb); + re->skb = NULL; + goto nomem; + } + } + return 0; +nomem: + return -ENOMEM; +} + /* - * Allocate and setup receiver buffer pool. + * Setup receiver buffer pool. * Normal case this ends up creating one list element for skb * in the receive ring. Worst case if using large MTU and each * allocation falls on a different 64 bit region, that results @@ -1388,7 +1414,7 @@ static inline void sky2_rx_update(struct sky2_port *sky2, unsigned rxq) * One element is used for checksum enable/disable, and one * extra to avoid wrap. */ -static int sky2_rx_start(struct sky2_port *sky2) +static void sky2_rx_start(struct sky2_port *sky2) { struct sky2_hw *hw = sky2->hw; struct rx_ring_info *re; @@ -1414,22 +1440,9 @@ static int sky2_rx_start(struct sky2_port *sky2) if (!(hw->flags & SKY2_HW_NEW_LE)) rx_set_checksum(sky2); - sky2->rx_data_size = sky2_get_rx_data_size(sky2); - - /* Fill Rx ring */ + /* submit Rx ring */ for (i = 0; i < sky2->rx_pending; i++) { re = sky2->rx_ring + i; - - re->skb = sky2_rx_alloc(sky2); - if (!re->skb) - goto nomem; - - if (sky2_rx_map_skb(hw->pdev, re, sky2->rx_data_size)) { - dev_kfree_skb(re->skb); - re->skb = NULL; - goto nomem; - } - sky2_rx_submit(sky2, re); } @@ -1471,13 +1484,6 @@ static int sky2_rx_start(struct sky2_port *sky2) sky2_write32(hw, Q_ADDR(txqaddr[sky2->port], Q_TEST), TBMU_TEST_HOME_ADD_FIX_EN | TBMU_TEST_ROUTING_ADD_FIX_EN); } - - - - return 0; -nomem: - sky2_rx_clean(sky2); - return -ENOMEM; } static int sky2_alloc_buffers(struct sky2_port *sky2) @@ -1508,7 +1514,7 @@ static int sky2_alloc_buffers(struct sky2_port *sky2) if (!sky2->rx_ring) goto nomem; - return 0; + return sky2_alloc_rx_skbs(sky2); nomem: return -ENOMEM; } @@ -1517,6 +1523,8 @@ static void sky2_free_buffers(struct sky2_port *sky2) { struct sky2_hw *hw = sky2->hw; + sky2_rx_clean(sky2); + if (sky2->rx_le) { pci_free_consistent(hw->pdev, RX_LE_BYTES, sky2->rx_le, sky2->rx_le_map); @@ -1606,9 +1614,7 @@ static int sky2_up(struct net_device *dev) sky2_set_vlan_mode(hw, port, sky2->vlgrp != NULL); #endif - err = sky2_rx_start(sky2); - if (err) - goto err_out; + sky2_rx_start(sky2); /* Enable interrupts from phy/mac for port */ imask = sky2_read32(hw, B0_IMSK); @@ -1976,8 +1982,6 @@ static int sky2_down(struct net_device *dev) /* Free any pending frames stuck in HW queue */ sky2_tx_complete(sky2, sky2->tx_prod); - sky2_rx_clean(sky2); - sky2_free_buffers(sky2); return 0; @@ -2267,7 +2271,11 @@ static int sky2_change_mtu(struct net_device *dev, int new_mtu) sky2_write8(hw, RB_ADDR(rxqaddr[port], RB_CTRL), RB_ENA_OP_MD); - err = sky2_rx_start(sky2); + err = sky2_alloc_rx_skbs(sky2); + if (!err) + sky2_rx_start(sky2); + else + sky2_rx_clean(sky2); sky2_write32(hw, B0_IMSK, imask); sky2_read32(hw, B0_Y2_SP_LISR); -- 1.5.6.5