From patchwork Wed May 12 05:34:45 2010 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: frank.blaschka@de.ibm.com X-Patchwork-Id: 52350 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 34053B7DDE for ; Wed, 12 May 2010 15:35:46 +1000 (EST) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752145Ab0ELFfd (ORCPT ); Wed, 12 May 2010 01:35:33 -0400 Received: from mtagate6.de.ibm.com ([195.212.17.166]:60856 "EHLO mtagate6.de.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751391Ab0ELFfa (ORCPT ); Wed, 12 May 2010 01:35:30 -0400 Received: from d12nrmr1607.megacenter.de.ibm.com (d12nrmr1607.megacenter.de.ibm.com [9.149.167.49]) by mtagate6.de.ibm.com (8.13.1/8.13.1) with ESMTP id o4C5ZTLc013643; Wed, 12 May 2010 05:35:29 GMT Received: from d12av02.megacenter.de.ibm.com (d12av02.megacenter.de.ibm.com [9.149.165.228]) by d12nrmr1607.megacenter.de.ibm.com (8.13.8/8.13.8/NCO v10.0) with ESMTP id o4C5ZTq01581126; Wed, 12 May 2010 07:35:29 +0200 Received: from d12av02.megacenter.de.ibm.com (loopback [127.0.0.1]) by d12av02.megacenter.de.ibm.com (8.12.11.20060308/8.13.3) with ESMTP id o4C5ZSjW008907; Wed, 12 May 2010 07:35:28 +0200 Received: from tuxmaker.boeblingen.de.ibm.com (tuxmaker.boeblingen.de.ibm.com [9.152.85.9]) by d12av02.megacenter.de.ibm.com (8.12.11.20060308/8.12.11) with ESMTP id o4C5ZSpI008884; Wed, 12 May 2010 07:35:28 +0200 Received: by tuxmaker.boeblingen.de.ibm.com (Postfix, from userid 24631) id 910591224230; Wed, 12 May 2010 07:35:28 +0200 (CEST) Message-Id: <20100512053528.463770000@de.ibm.com> User-Agent: quilt/0.47-1 Date: Wed, 12 May 2010 07:34:45 +0200 From: frank.blaschka@de.ibm.com To: davem@davemloft.net Cc: netdev@vger.kernel.org, linux-s390@vger.kernel.org Subject: [patch 1/3] [PATCH] qeth: exploit HW TX checksumming References: <20100512053444.035939000@de.ibm.com> Content-Disposition: inline; filename=601-qeth-hw-tx-checksum.diff Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org From: Frank Blaschka OSA supports HW TX checksumming in layer 3 mode. Enable this feature and remove software fallback used for TSO. Cleanup checksum bits to indicate OSA can do checksumming only for IPv4 TCP and UDP. Signed-off-by: Frank Blaschka --- drivers/s390/net/qeth_core.h | 3 - drivers/s390/net/qeth_l3_main.c | 92 +++++++++++++++++++++++++++++----------- 2 files changed, 69 insertions(+), 26 deletions(-) -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html diff -urpN linux-2.6/drivers/s390/net/qeth_core.h linux-2.6-patched/drivers/s390/net/qeth_core.h --- linux-2.6/drivers/s390/net/qeth_core.h 2010-05-11 22:10:12.000000000 +0200 +++ linux-2.6-patched/drivers/s390/net/qeth_core.h 2010-05-11 22:10:34.000000000 +0200 @@ -351,7 +351,7 @@ enum qeth_header_ids { #define QETH_HDR_EXT_SRC_MAC_ADDR 0x08 #define QETH_HDR_EXT_CSUM_HDR_REQ 0x10 #define QETH_HDR_EXT_CSUM_TRANSP_REQ 0x20 -#define QETH_HDR_EXT_UDP_TSO 0x40 /*bit off for TCP*/ +#define QETH_HDR_EXT_UDP 0x40 /*bit off for TCP*/ static inline int qeth_is_last_sbale(struct qdio_buffer_element *sbale) { @@ -630,6 +630,7 @@ struct qeth_card_info { int unique_id; struct qeth_card_blkt blkt; __u32 csum_mask; + __u32 tx_csum_mask; enum qeth_ipa_promisc_modes promisc_mode; }; diff -urpN linux-2.6/drivers/s390/net/qeth_l3_main.c linux-2.6-patched/drivers/s390/net/qeth_l3_main.c --- linux-2.6/drivers/s390/net/qeth_l3_main.c 2010-05-11 22:10:12.000000000 +0200 +++ linux-2.6-patched/drivers/s390/net/qeth_l3_main.c 2010-05-11 22:10:34.000000000 +0200 @@ -54,16 +54,16 @@ int qeth_l3_set_large_send(struct qeth_c if (card->options.large_send == QETH_LARGE_SEND_TSO) { if (qeth_is_supported(card, IPA_OUTBOUND_TSO)) { card->dev->features |= NETIF_F_TSO | NETIF_F_SG | - NETIF_F_HW_CSUM; + NETIF_F_IP_CSUM; } else { card->dev->features &= ~(NETIF_F_TSO | NETIF_F_SG | - NETIF_F_HW_CSUM); + NETIF_F_IP_CSUM); card->options.large_send = QETH_LARGE_SEND_NO; rc = -EOPNOTSUPP; } } else { card->dev->features &= ~(NETIF_F_TSO | NETIF_F_SG | - NETIF_F_HW_CSUM); + NETIF_F_IP_CSUM); card->options.large_send = QETH_LARGE_SEND_NO; } return rc; @@ -1108,6 +1108,13 @@ static int qeth_l3_default_setassparms_c card->info.csum_mask = cmd->data.setassparms.data.flags_32bit; QETH_DBF_TEXT_(TRACE, 3, "csum:%d", card->info.csum_mask); } + if (cmd->data.setassparms.hdr.assist_no == IPA_OUTBOUND_CHECKSUM && + cmd->data.setassparms.hdr.command_code == IPA_CMD_ASS_START) { + card->info.tx_csum_mask = + cmd->data.setassparms.data.flags_32bit; + QETH_DBF_TEXT_(TRACE, 3, "tcsu:%d", card->info.tx_csum_mask); + } + return 0; } @@ -1536,6 +1543,28 @@ static int qeth_l3_start_ipa_checksum(st return rc; } +static int qeth_l3_start_ipa_tx_checksum(struct qeth_card *card) +{ + int rc = 0; + + if (!qeth_is_supported(card, IPA_OUTBOUND_CHECKSUM)) + return rc; + rc = qeth_l3_send_simple_setassparms(card, IPA_OUTBOUND_CHECKSUM, + IPA_CMD_ASS_START, 0); + if (rc) + goto err_out; + rc = qeth_l3_send_simple_setassparms(card, IPA_OUTBOUND_CHECKSUM, + IPA_CMD_ASS_ENABLE, card->info.tx_csum_mask); + if (rc) + goto err_out; + dev_info(&card->gdev->dev, "HW TX Checksumming enabled\n"); + return rc; +err_out: + dev_warn(&card->gdev->dev, "Enabling HW TX checksumming for %s " + "failed, using SW TX checksumming\n", QETH_CARD_IFNAME(card)); + return rc; +} + static int qeth_l3_start_ipa_tso(struct qeth_card *card) { int rc; @@ -1578,6 +1607,7 @@ static int qeth_l3_start_ipassists(struc qeth_l3_start_ipa_ipv6(card); /* go on*/ qeth_l3_start_ipa_broadcast(card); /* go on*/ qeth_l3_start_ipa_checksum(card); /* go on*/ + qeth_l3_start_ipa_tx_checksum(card); qeth_l3_start_ipa_tso(card); /* go on*/ return 0; } @@ -2817,6 +2847,21 @@ static void qeth_l3_fill_header(struct q } } +static inline void qeth_l3_hdr_csum(struct qeth_card *card, + struct qeth_hdr *hdr, struct sk_buff *skb) +{ + struct iphdr *iph = ip_hdr(skb); + + /* tcph->check contains already the pseudo hdr checksum + * so just set the header flags + */ + if (iph->protocol == IPPROTO_UDP) + hdr->hdr.l3.ext_flags |= QETH_HDR_EXT_UDP; + hdr->hdr.l3.ext_flags |= QETH_HDR_EXT_CSUM_TRANSP_REQ; + if (card->options.performance_stats) + card->perf_stats.tx_csum++; +} + static void qeth_tso_fill_header(struct qeth_card *card, struct qeth_hdr *qhdr, struct sk_buff *skb) { @@ -2852,21 +2897,6 @@ static void qeth_tso_fill_header(struct } } -static void qeth_tx_csum(struct sk_buff *skb) -{ - __wsum csum; - int offset; - - skb_set_transport_header(skb, skb->csum_start - skb_headroom(skb)); - offset = skb->csum_start - skb_headroom(skb); - BUG_ON(offset >= skb_headlen(skb)); - csum = skb_checksum(skb, offset, skb->len - offset, 0); - - offset += skb->csum_offset; - BUG_ON(offset + sizeof(__sum16) > skb_headlen(skb)); - *(__sum16 *)(skb->data + offset) = csum_fold(csum); -} - static inline int qeth_l3_tso_elements(struct sk_buff *skb) { unsigned long tcpd = (unsigned long)tcp_hdr(skb) + @@ -2923,12 +2953,6 @@ static int qeth_l3_hard_start_xmit(struc if (skb_is_gso(skb)) large_send = card->options.large_send; - else - if (skb->ip_summed == CHECKSUM_PARTIAL) { - qeth_tx_csum(skb); - if (card->options.performance_stats) - card->perf_stats.tx_csum++; - } if ((card->info.type == QETH_CARD_TYPE_IQD) && (!large_send) && (skb_shinfo(skb)->nr_frags == 0)) { @@ -3007,6 +3031,9 @@ static int qeth_l3_hard_start_xmit(struc cast_type); hdr->hdr.l3.length = new_skb->len - data_offset; } + + if (skb->ip_summed == CHECKSUM_PARTIAL) + qeth_l3_hdr_csum(card, hdr, new_skb); } elems = qeth_get_elements_no(card, (void *)hdr, new_skb, @@ -3132,10 +3159,25 @@ static int qeth_l3_ethtool_set_tso(struc return rc; } +static int qeth_l3_ethtool_set_tx_csum(struct net_device *dev, u32 data) +{ + struct qeth_card *card = dev->ml_priv; + + if (data) { + if (qeth_is_supported(card, IPA_OUTBOUND_CHECKSUM)) + dev->features |= NETIF_F_IP_CSUM; + else + return -EPERM; + } else + dev->features &= ~NETIF_F_IP_CSUM; + + return 0; +} + static const struct ethtool_ops qeth_l3_ethtool_ops = { .get_link = ethtool_op_get_link, .get_tx_csum = ethtool_op_get_tx_csum, - .set_tx_csum = ethtool_op_set_tx_hw_csum, + .set_tx_csum = qeth_l3_ethtool_set_tx_csum, .get_rx_csum = qeth_l3_ethtool_get_rx_csum, .set_rx_csum = qeth_l3_ethtool_set_rx_csum, .get_sg = ethtool_op_get_sg,