From: Frank Blaschka The maximum TSO size OSA can handle is 15 * PAGE_SIZE. This patch reduces gso_max_size to this value and adds some sanity checks and statistics to the TSO implementation. Since only layer 3 is able to do TSO move all TSO related functions to the qeth_l3 module. Signed-off-by: Frank Blaschka --- drivers/s390/net/qeth_core.h | 2 - drivers/s390/net/qeth_core_main.c | 37 +------------------ drivers/s390/net/qeth_core_sys.c | 48 ------------------------- drivers/s390/net/qeth_l2_main.c | 1 drivers/s390/net/qeth_l3.h | 1 drivers/s390/net/qeth_l3_main.c | 71 +++++++++++++++++++++++++++++++------- drivers/s390/net/qeth_l3_sys.c | 48 +++++++++++++++++++++++++ 7 files changed, 110 insertions(+), 98 deletions(-) Index: git_net-next/drivers/s390/net/qeth_core.h =================================================================== --- git_net-next.orig/drivers/s390/net/qeth_core.h +++ git_net-next/drivers/s390/net/qeth_core.h @@ -134,6 +134,7 @@ struct qeth_perf_stats { unsigned int sg_frags_rx; unsigned int sg_alloc_page_rx; unsigned int tx_csum; + unsigned int tx_lin; }; /* Routing stuff */ @@ -835,7 +836,6 @@ void qeth_prepare_ipa_cmd(struct qeth_ca struct qeth_cmd_buffer *qeth_wait_for_buffer(struct qeth_channel *); int qeth_mdio_read(struct net_device *, int, int); int qeth_snmp_command(struct qeth_card *, char __user *); -int qeth_set_large_send(struct qeth_card *, enum qeth_large_send_types); struct qeth_cmd_buffer *qeth_get_adapter_cmd(struct qeth_card *, __u32, __u32); int qeth_default_setadapterparms_cb(struct qeth_card *, struct qeth_reply *, unsigned long); Index: git_net-next/drivers/s390/net/qeth_core_main.c =================================================================== --- git_net-next.orig/drivers/s390/net/qeth_core_main.c +++ git_net-next/drivers/s390/net/qeth_core_main.c @@ -270,41 +270,6 @@ int qeth_realloc_buffer_pool(struct qeth return qeth_alloc_buffer_pool(card); } -int qeth_set_large_send(struct qeth_card *card, - enum qeth_large_send_types type) -{ - int rc = 0; - - if (card->dev == NULL) { - card->options.large_send = type; - return 0; - } - if (card->state == CARD_STATE_UP) - netif_tx_disable(card->dev); - card->options.large_send = type; - switch (card->options.large_send) { - case 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; - } else { - card->dev->features &= ~(NETIF_F_TSO | NETIF_F_SG | - NETIF_F_HW_CSUM); - card->options.large_send = QETH_LARGE_SEND_NO; - rc = -EOPNOTSUPP; - } - break; - default: /* includes QETH_LARGE_SEND_NO */ - card->dev->features &= ~(NETIF_F_TSO | NETIF_F_SG | - NETIF_F_HW_CSUM); - break; - } - if (card->state == CARD_STATE_UP) - netif_wake_queue(card->dev); - return rc; -} -EXPORT_SYMBOL_GPL(qeth_set_large_send); - static int qeth_issue_next_read(struct qeth_card *card) { int rc; @@ -4460,6 +4425,7 @@ static struct { {"tx do_QDIO time"}, {"tx do_QDIO count"}, {"tx csum"}, + {"tx lin"}, }; int qeth_core_get_sset_count(struct net_device *dev, int stringset) @@ -4517,6 +4483,7 @@ void qeth_core_get_ethtool_stats(struct data[31] = card->perf_stats.outbound_do_qdio_time; data[32] = card->perf_stats.outbound_do_qdio_cnt; data[33] = card->perf_stats.tx_csum; + data[34] = card->perf_stats.tx_lin; } EXPORT_SYMBOL_GPL(qeth_core_get_ethtool_stats); Index: git_net-next/drivers/s390/net/qeth_core_sys.c =================================================================== --- git_net-next.orig/drivers/s390/net/qeth_core_sys.c +++ git_net-next/drivers/s390/net/qeth_core_sys.c @@ -416,53 +416,6 @@ static ssize_t qeth_dev_layer2_store(str static DEVICE_ATTR(layer2, 0644, qeth_dev_layer2_show, qeth_dev_layer2_store); -static ssize_t qeth_dev_large_send_show(struct device *dev, - struct device_attribute *attr, char *buf) -{ - struct qeth_card *card = dev_get_drvdata(dev); - - if (!card) - return -EINVAL; - - switch (card->options.large_send) { - case QETH_LARGE_SEND_NO: - return sprintf(buf, "%s\n", "no"); - case QETH_LARGE_SEND_TSO: - return sprintf(buf, "%s\n", "TSO"); - default: - return sprintf(buf, "%s\n", "N/A"); - } -} - -static ssize_t qeth_dev_large_send_store(struct device *dev, - struct device_attribute *attr, const char *buf, size_t count) -{ - struct qeth_card *card = dev_get_drvdata(dev); - enum qeth_large_send_types type; - int rc = 0; - char *tmp; - - if (!card) - return -EINVAL; - tmp = strsep((char **) &buf, "\n"); - if (!strcmp(tmp, "no")) { - type = QETH_LARGE_SEND_NO; - } else if (!strcmp(tmp, "TSO")) { - type = QETH_LARGE_SEND_TSO; - } else { - return -EINVAL; - } - if (card->options.large_send == type) - return count; - rc = qeth_set_large_send(card, type); - if (rc) - return rc; - return count; -} - -static DEVICE_ATTR(large_send, 0644, qeth_dev_large_send_show, - qeth_dev_large_send_store); - #define ATTR_QETH_ISOLATION_NONE ("none") #define ATTR_QETH_ISOLATION_FWD ("forward") #define ATTR_QETH_ISOLATION_DROP ("drop") @@ -658,7 +611,6 @@ static struct attribute *qeth_device_att &dev_attr_recover.attr, &dev_attr_performance_stats.attr, &dev_attr_layer2.attr, - &dev_attr_large_send.attr, &dev_attr_isolation.attr, NULL, }; Index: git_net-next/drivers/s390/net/qeth_l2_main.c =================================================================== --- git_net-next.orig/drivers/s390/net/qeth_l2_main.c +++ git_net-next/drivers/s390/net/qeth_l2_main.c @@ -978,7 +978,6 @@ static int __qeth_l2_set_online(struct c if (card->info.type != QETH_CARD_TYPE_OSN) { /* configure isolation level */ qeth_set_access_ctrl_online(card); - qeth_set_large_send(card, card->options.large_send); qeth_l2_process_vlans(card, 0); } Index: git_net-next/drivers/s390/net/qeth_l3.h =================================================================== --- git_net-next.orig/drivers/s390/net/qeth_l3.h +++ git_net-next/drivers/s390/net/qeth_l3.h @@ -60,5 +60,6 @@ void qeth_l3_del_vipa(struct qeth_card * int qeth_l3_add_rxip(struct qeth_card *, enum qeth_prot_versions, const u8 *); void qeth_l3_del_rxip(struct qeth_card *card, enum qeth_prot_versions, const u8 *); +int qeth_l3_set_large_send(struct qeth_card *, enum qeth_large_send_types); #endif /* __QETH_L3_H__ */ Index: git_net-next/drivers/s390/net/qeth_l3_main.c =================================================================== --- git_net-next.orig/drivers/s390/net/qeth_l3_main.c +++ git_net-next/drivers/s390/net/qeth_l3_main.c @@ -41,6 +41,32 @@ static int qeth_l3_deregister_addr_entry static int __qeth_l3_set_online(struct ccwgroup_device *, int); static int __qeth_l3_set_offline(struct ccwgroup_device *, int); +int qeth_l3_set_large_send(struct qeth_card *card, + enum qeth_large_send_types type) +{ + int rc = 0; + + card->options.large_send = type; + if (card->dev == NULL) + return 0; + + 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; + } else { + card->dev->features &= ~(NETIF_F_TSO | NETIF_F_SG | + NETIF_F_HW_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); + card->options.large_send = QETH_LARGE_SEND_NO; + } + return rc; +} static int qeth_l3_isxdigit(char *buf) { @@ -2686,6 +2712,24 @@ static void qeth_tx_csum(struct sk_buff *(__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) + + tcp_hdr(skb)->doff * 4; + int tcpd_len = skb->len - (tcpd - (unsigned long)skb->data); + int elements = PFN_UP(tcpd + tcpd_len) - PFN_DOWN(tcpd); + elements += skb_shinfo(skb)->nr_frags; + return elements; +} + +static inline int qeth_l3_tso_check(struct sk_buff *skb) +{ + int len = ((unsigned long)tcp_hdr(skb) + tcp_hdr(skb)->doff * 4) - + (unsigned long)skb->data; + return (((unsigned long)skb->data & PAGE_MASK) != + (((unsigned long)skb->data + len) & PAGE_MASK)); +} + static int qeth_l3_hard_start_xmit(struct sk_buff *skb, struct net_device *dev) { int rc; @@ -2779,16 +2823,21 @@ static int qeth_l3_hard_start_xmit(struc /* fix hardware limitation: as long as we do not have sbal * chaining we can not send long frag lists */ - if ((large_send == QETH_LARGE_SEND_TSO) && - ((skb_shinfo(new_skb)->nr_frags + 2) > 16)) { - if (skb_linearize(new_skb)) - goto tx_drop; + if (large_send == QETH_LARGE_SEND_TSO) { + if (qeth_l3_tso_elements(new_skb) + 1 > 16) { + if (skb_linearize(new_skb)) + goto tx_drop; + if (card->options.performance_stats) + card->perf_stats.tx_lin++; + } } if ((large_send == QETH_LARGE_SEND_TSO) && (cast_type == RTN_UNSPEC)) { hdr = (struct qeth_hdr *)skb_push(new_skb, sizeof(struct qeth_hdr_tso)); + if (qeth_l3_tso_check(new_skb)) + QETH_DBF_MESSAGE(2, "tso skb misaligned\n"); memset(hdr, 0, sizeof(struct qeth_hdr_tso)); qeth_l3_fill_header(card, hdr, new_skb, ipv, cast_type); qeth_tso_fill_header(card, hdr, new_skb); @@ -2931,20 +2980,15 @@ static int qeth_l3_ethtool_set_rx_csum(s static int qeth_l3_ethtool_set_tso(struct net_device *dev, u32 data) { struct qeth_card *card = dev->ml_priv; + int rc = 0; if (data) { - if (card->options.large_send == QETH_LARGE_SEND_NO) { - if (card->info.type == QETH_CARD_TYPE_IQD) - return -EPERM; - else - card->options.large_send = QETH_LARGE_SEND_TSO; - dev->features |= NETIF_F_TSO; - } + rc = qeth_l3_set_large_send(card, QETH_LARGE_SEND_TSO); } else { dev->features &= ~NETIF_F_TSO; card->options.large_send = QETH_LARGE_SEND_NO; } - return 0; + return rc; } static const struct ethtool_ops qeth_l3_ethtool_ops = { @@ -3060,6 +3104,7 @@ static int qeth_l3_setup_netdev(struct q NETIF_F_HW_VLAN_RX | NETIF_F_HW_VLAN_FILTER; card->dev->priv_flags &= ~IFF_XMIT_DST_RELEASE; + card->dev->gso_max_size = 15 * PAGE_SIZE; SET_NETDEV_DEV(card->dev, &card->gdev->dev); return register_netdev(card->dev); @@ -3189,7 +3234,7 @@ static int __qeth_l3_set_online(struct c goto out_remove; } else card->lan_online = 1; - qeth_set_large_send(card, card->options.large_send); + qeth_l3_set_large_send(card, card->options.large_send); rc = qeth_l3_setadapter_parms(card); if (rc) Index: git_net-next/drivers/s390/net/qeth_l3_sys.c =================================================================== --- git_net-next.orig/drivers/s390/net/qeth_l3_sys.c +++ git_net-next/drivers/s390/net/qeth_l3_sys.c @@ -318,6 +318,53 @@ static ssize_t qeth_l3_dev_checksum_stor static DEVICE_ATTR(checksumming, 0644, qeth_l3_dev_checksum_show, qeth_l3_dev_checksum_store); +static ssize_t qeth_l3_dev_large_send_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct qeth_card *card = dev_get_drvdata(dev); + + if (!card) + return -EINVAL; + + switch (card->options.large_send) { + case QETH_LARGE_SEND_NO: + return sprintf(buf, "%s\n", "no"); + case QETH_LARGE_SEND_TSO: + return sprintf(buf, "%s\n", "TSO"); + default: + return sprintf(buf, "%s\n", "N/A"); + } +} + +static ssize_t qeth_l3_dev_large_send_store(struct device *dev, + struct device_attribute *attr, const char *buf, size_t count) +{ + struct qeth_card *card = dev_get_drvdata(dev); + enum qeth_large_send_types type; + int rc = 0; + char *tmp; + + if (!card) + return -EINVAL; + tmp = strsep((char **) &buf, "\n"); + if (!strcmp(tmp, "no")) + type = QETH_LARGE_SEND_NO; + else if (!strcmp(tmp, "TSO")) + type = QETH_LARGE_SEND_TSO; + else + return -EINVAL; + + if (card->options.large_send == type) + return count; + rc = qeth_l3_set_large_send(card, type); + if (rc) + return rc; + return count; +} + +static DEVICE_ATTR(large_send, 0644, qeth_l3_dev_large_send_show, + qeth_l3_dev_large_send_store); + static struct attribute *qeth_l3_device_attrs[] = { &dev_attr_route4.attr, &dev_attr_route6.attr, @@ -325,6 +372,7 @@ static struct attribute *qeth_l3_device_ &dev_attr_broadcast_mode.attr, &dev_attr_canonical_macaddr.attr, &dev_attr_checksumming.attr, + &dev_attr_large_send.attr, NULL, }; -- 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