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android_kernel_xiaomi_sm8350/drivers/s390/net/qeth_ethtool.c
Julian Wiedmann e53edf743d s390/qeth: add TX NAPI support for IQD devices 
Due to their large MTU and potentially low utilization of TX buffers,
IQD devices in particular require fast TX recycling. This makes them
a prime candidate for a TX NAPI path in qeth.

qeth_tx_poll() uses the recently introduced qdio_inspect_queue() helper
to poll the TX queue for completed buffers. To avoid hogging the CPU for
too long, we yield to the stack after completing an entire queue's worth
of buffers.
While IQD is expected to transfer its buffers synchronously (and thus
doesn't support TX interrupts), a timer covers for the odd case where a
TX buffer doesn't complete synchronously. Currently this timer should
only ever fire for
(1) the mcast queue,
(2) the occasional race, where the NAPI poll code observes an update to
    queue->used_buffers while the TX doorbell hasn't been issued yet.

Signed-off-by: Julian Wiedmann <jwi@linux.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2019-08-24 16:39:18 -07:00

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// SPDX-License-Identifier: GPL-2.0
/*
* Copyright IBM Corp. 2018
*/
#define KMSG_COMPONENT "qeth"
#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
#include <linux/ethtool.h>
#include "qeth_core.h"
#define QETH_TXQ_STAT(_name, _stat) { \
.name = _name, \
.offset = offsetof(struct qeth_out_q_stats, _stat) \
}
#define QETH_CARD_STAT(_name, _stat) { \
.name = _name, \
.offset = offsetof(struct qeth_card_stats, _stat) \
}
struct qeth_stats {
char name[ETH_GSTRING_LEN];
unsigned int offset;
};
static const struct qeth_stats txq_stats[] = {
QETH_TXQ_STAT("IO buffers", bufs),
QETH_TXQ_STAT("IO buffer elements", buf_elements),
QETH_TXQ_STAT("packed IO buffers", bufs_pack),
QETH_TXQ_STAT("skbs", tx_packets),
QETH_TXQ_STAT("packed skbs", skbs_pack),
QETH_TXQ_STAT("SG skbs", skbs_sg),
QETH_TXQ_STAT("HW csum skbs", skbs_csum),
QETH_TXQ_STAT("TSO skbs", skbs_tso),
QETH_TXQ_STAT("linearized skbs", skbs_linearized),
QETH_TXQ_STAT("linearized+error skbs", skbs_linearized_fail),
QETH_TXQ_STAT("TSO bytes", tso_bytes),
QETH_TXQ_STAT("Packing mode switches", packing_mode_switch),
QETH_TXQ_STAT("Queue stopped", stopped),
QETH_TXQ_STAT("Completion yield", completion_yield),
QETH_TXQ_STAT("Completion timer", completion_timer),
};
static const struct qeth_stats card_stats[] = {
QETH_CARD_STAT("rx0 IO buffers", rx_bufs),
QETH_CARD_STAT("rx0 HW csum skbs", rx_skb_csum),
QETH_CARD_STAT("rx0 SG skbs", rx_sg_skbs),
QETH_CARD_STAT("rx0 SG page frags", rx_sg_frags),
QETH_CARD_STAT("rx0 SG page allocs", rx_sg_alloc_page),
};
#define TXQ_STATS_LEN ARRAY_SIZE(txq_stats)
#define CARD_STATS_LEN ARRAY_SIZE(card_stats)
static void qeth_add_stat_data(u64 **dst, void *src,
const struct qeth_stats stats[],
unsigned int size)
{
unsigned int i;
char *stat;
for (i = 0; i < size; i++) {
stat = (char *)src + stats[i].offset;
**dst = *(u64 *)stat;
(*dst)++;
}
}
static void qeth_add_stat_strings(u8 **data, const char *prefix,
const struct qeth_stats stats[],
unsigned int size)
{
unsigned int i;
for (i = 0; i < size; i++) {
snprintf(*data, ETH_GSTRING_LEN, "%s%s", prefix, stats[i].name);
*data += ETH_GSTRING_LEN;
}
}
static int qeth_get_sset_count(struct net_device *dev, int stringset)
{
struct qeth_card *card = dev->ml_priv;
switch (stringset) {
case ETH_SS_STATS:
return CARD_STATS_LEN +
card->qdio.no_out_queues * TXQ_STATS_LEN;
default:
return -EINVAL;
}
}
static void qeth_get_ethtool_stats(struct net_device *dev,
struct ethtool_stats *stats, u64 *data)
{
struct qeth_card *card = dev->ml_priv;
unsigned int i;
qeth_add_stat_data(&data, &card->stats, card_stats, CARD_STATS_LEN);
for (i = 0; i < card->qdio.no_out_queues; i++)
qeth_add_stat_data(&data, &card->qdio.out_qs[i]->stats,
txq_stats, TXQ_STATS_LEN);
}
static void qeth_get_ringparam(struct net_device *dev,
struct ethtool_ringparam *param)
{
struct qeth_card *card = dev->ml_priv;
param->rx_max_pending = QDIO_MAX_BUFFERS_PER_Q;
param->rx_mini_max_pending = 0;
param->rx_jumbo_max_pending = 0;
param->tx_max_pending = QDIO_MAX_BUFFERS_PER_Q;
param->rx_pending = card->qdio.in_buf_pool.buf_count;
param->rx_mini_pending = 0;
param->rx_jumbo_pending = 0;
param->tx_pending = QDIO_MAX_BUFFERS_PER_Q;
}
static void qeth_get_strings(struct net_device *dev, u32 stringset, u8 *data)
{
struct qeth_card *card = dev->ml_priv;
char prefix[ETH_GSTRING_LEN] = "";
unsigned int i;
switch (stringset) {
case ETH_SS_STATS:
qeth_add_stat_strings(&data, prefix, card_stats,
CARD_STATS_LEN);
for (i = 0; i < card->qdio.no_out_queues; i++) {
snprintf(prefix, ETH_GSTRING_LEN, "tx%u ", i);
qeth_add_stat_strings(&data, prefix, txq_stats,
TXQ_STATS_LEN);
}
break;
default:
WARN_ON(1);
break;
}
}
static void qeth_get_drvinfo(struct net_device *dev,
struct ethtool_drvinfo *info)
{
struct qeth_card *card = dev->ml_priv;
strlcpy(info->driver, IS_LAYER2(card) ? "qeth_l2" : "qeth_l3",
sizeof(info->driver));
strlcpy(info->version, "1.0", sizeof(info->version));
strlcpy(info->fw_version, card->info.mcl_level,
sizeof(info->fw_version));
snprintf(info->bus_info, sizeof(info->bus_info), "%s/%s/%s",
CARD_RDEV_ID(card), CARD_WDEV_ID(card), CARD_DDEV_ID(card));
}
static void qeth_get_channels(struct net_device *dev,
struct ethtool_channels *channels)
{
struct qeth_card *card = dev->ml_priv;
channels->max_rx = dev->num_rx_queues;
channels->max_tx = card->qdio.no_out_queues;
channels->max_other = 0;
channels->max_combined = 0;
channels->rx_count = dev->real_num_rx_queues;
channels->tx_count = dev->real_num_tx_queues;
channels->other_count = 0;
channels->combined_count = 0;
}
/* Helper function to fill 'advertising' and 'supported' which are the same. */
/* Autoneg and full-duplex are supported and advertised unconditionally. */
/* Always advertise and support all speeds up to specified, and only one */
/* specified port type. */
static void qeth_set_cmd_adv_sup(struct ethtool_link_ksettings *cmd,
int maxspeed, int porttype)
{
ethtool_link_ksettings_zero_link_mode(cmd, supported);
ethtool_link_ksettings_zero_link_mode(cmd, advertising);
ethtool_link_ksettings_zero_link_mode(cmd, lp_advertising);
ethtool_link_ksettings_add_link_mode(cmd, supported, Autoneg);
ethtool_link_ksettings_add_link_mode(cmd, advertising, Autoneg);
switch (porttype) {
case PORT_TP:
ethtool_link_ksettings_add_link_mode(cmd, supported, TP);
ethtool_link_ksettings_add_link_mode(cmd, advertising, TP);
break;
case PORT_FIBRE:
ethtool_link_ksettings_add_link_mode(cmd, supported, FIBRE);
ethtool_link_ksettings_add_link_mode(cmd, advertising, FIBRE);
break;
default:
ethtool_link_ksettings_add_link_mode(cmd, supported, TP);
ethtool_link_ksettings_add_link_mode(cmd, advertising, TP);
WARN_ON_ONCE(1);
}
/* partially does fall through, to also select lower speeds */
switch (maxspeed) {
case SPEED_25000:
ethtool_link_ksettings_add_link_mode(cmd, supported,
25000baseSR_Full);
ethtool_link_ksettings_add_link_mode(cmd, advertising,
25000baseSR_Full);
break;
case SPEED_10000:
ethtool_link_ksettings_add_link_mode(cmd, supported,
10000baseT_Full);
ethtool_link_ksettings_add_link_mode(cmd, advertising,
10000baseT_Full);
/* fall through */
case SPEED_1000:
ethtool_link_ksettings_add_link_mode(cmd, supported,
1000baseT_Full);
ethtool_link_ksettings_add_link_mode(cmd, advertising,
1000baseT_Full);
ethtool_link_ksettings_add_link_mode(cmd, supported,
1000baseT_Half);
ethtool_link_ksettings_add_link_mode(cmd, advertising,
1000baseT_Half);
/* fall through */
case SPEED_100:
ethtool_link_ksettings_add_link_mode(cmd, supported,
100baseT_Full);
ethtool_link_ksettings_add_link_mode(cmd, advertising,
100baseT_Full);
ethtool_link_ksettings_add_link_mode(cmd, supported,
100baseT_Half);
ethtool_link_ksettings_add_link_mode(cmd, advertising,
100baseT_Half);
/* fall through */
case SPEED_10:
ethtool_link_ksettings_add_link_mode(cmd, supported,
10baseT_Full);
ethtool_link_ksettings_add_link_mode(cmd, advertising,
10baseT_Full);
ethtool_link_ksettings_add_link_mode(cmd, supported,
10baseT_Half);
ethtool_link_ksettings_add_link_mode(cmd, advertising,
10baseT_Half);
break;
default:
ethtool_link_ksettings_add_link_mode(cmd, supported,
10baseT_Full);
ethtool_link_ksettings_add_link_mode(cmd, advertising,
10baseT_Full);
ethtool_link_ksettings_add_link_mode(cmd, supported,
10baseT_Half);
ethtool_link_ksettings_add_link_mode(cmd, advertising,
10baseT_Half);
WARN_ON_ONCE(1);
}
}
static int qeth_get_link_ksettings(struct net_device *netdev,
struct ethtool_link_ksettings *cmd)
{
struct qeth_card *card = netdev->ml_priv;
enum qeth_link_types link_type;
struct carrier_info carrier_info;
int rc;
if (IS_IQD(card) || IS_VM_NIC(card))
link_type = QETH_LINK_TYPE_10GBIT_ETH;
else
link_type = card->info.link_type;
cmd->base.duplex = DUPLEX_FULL;
cmd->base.autoneg = AUTONEG_ENABLE;
cmd->base.phy_address = 0;
cmd->base.mdio_support = 0;
cmd->base.eth_tp_mdix = ETH_TP_MDI_INVALID;
cmd->base.eth_tp_mdix_ctrl = ETH_TP_MDI_INVALID;
switch (link_type) {
case QETH_LINK_TYPE_FAST_ETH:
case QETH_LINK_TYPE_LANE_ETH100:
cmd->base.speed = SPEED_100;
cmd->base.port = PORT_TP;
break;
case QETH_LINK_TYPE_GBIT_ETH:
case QETH_LINK_TYPE_LANE_ETH1000:
cmd->base.speed = SPEED_1000;
cmd->base.port = PORT_FIBRE;
break;
case QETH_LINK_TYPE_10GBIT_ETH:
cmd->base.speed = SPEED_10000;
cmd->base.port = PORT_FIBRE;
break;
case QETH_LINK_TYPE_25GBIT_ETH:
cmd->base.speed = SPEED_25000;
cmd->base.port = PORT_FIBRE;
break;
default:
cmd->base.speed = SPEED_10;
cmd->base.port = PORT_TP;
}
qeth_set_cmd_adv_sup(cmd, cmd->base.speed, cmd->base.port);
/* Check if we can obtain more accurate information. */
/* If QUERY_CARD_INFO command is not supported or fails, */
/* just return the heuristics that was filled above. */
rc = qeth_query_card_info(card, &carrier_info);
if (rc == -EOPNOTSUPP) /* for old hardware, return heuristic */
return 0;
if (rc) /* report error from the hardware operation */
return rc;
/* on success, fill in the information got from the hardware */
netdev_dbg(netdev,
"card info: card_type=0x%02x, port_mode=0x%04x, port_speed=0x%08x\n",
carrier_info.card_type,
carrier_info.port_mode,
carrier_info.port_speed);
/* Update attributes for which we've obtained more authoritative */
/* information, leave the rest the way they where filled above. */
switch (carrier_info.card_type) {
case CARD_INFO_TYPE_1G_COPPER_A:
case CARD_INFO_TYPE_1G_COPPER_B:
cmd->base.port = PORT_TP;
qeth_set_cmd_adv_sup(cmd, SPEED_1000, cmd->base.port);
break;
case CARD_INFO_TYPE_1G_FIBRE_A:
case CARD_INFO_TYPE_1G_FIBRE_B:
cmd->base.port = PORT_FIBRE;
qeth_set_cmd_adv_sup(cmd, SPEED_1000, cmd->base.port);
break;
case CARD_INFO_TYPE_10G_FIBRE_A:
case CARD_INFO_TYPE_10G_FIBRE_B:
cmd->base.port = PORT_FIBRE;
qeth_set_cmd_adv_sup(cmd, SPEED_10000, cmd->base.port);
break;
}
switch (carrier_info.port_mode) {
case CARD_INFO_PORTM_FULLDUPLEX:
cmd->base.duplex = DUPLEX_FULL;
break;
case CARD_INFO_PORTM_HALFDUPLEX:
cmd->base.duplex = DUPLEX_HALF;
break;
}
switch (carrier_info.port_speed) {
case CARD_INFO_PORTS_10M:
cmd->base.speed = SPEED_10;
break;
case CARD_INFO_PORTS_100M:
cmd->base.speed = SPEED_100;
break;
case CARD_INFO_PORTS_1G:
cmd->base.speed = SPEED_1000;
break;
case CARD_INFO_PORTS_10G:
cmd->base.speed = SPEED_10000;
break;
case CARD_INFO_PORTS_25G:
cmd->base.speed = SPEED_25000;
break;
}
return 0;
}
const struct ethtool_ops qeth_ethtool_ops = {
.get_link = ethtool_op_get_link,
.get_ringparam = qeth_get_ringparam,
.get_strings = qeth_get_strings,
.get_ethtool_stats = qeth_get_ethtool_stats,
.get_sset_count = qeth_get_sset_count,
.get_drvinfo = qeth_get_drvinfo,
.get_channels = qeth_get_channels,
.get_link_ksettings = qeth_get_link_ksettings,
};
const struct ethtool_ops qeth_osn_ethtool_ops = {
.get_strings = qeth_get_strings,
.get_ethtool_stats = qeth_get_ethtool_stats,
.get_sset_count = qeth_get_sset_count,
.get_drvinfo = qeth_get_drvinfo,
};
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