/****************************************************************************
* Driver for Solarflare Solarstorm network controllers and boards
* Copyright 2005-2006 Fen Systems Ltd.
* Copyright 2006-2008 Solarflare Communications Inc.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 as published
* by the Free Software Foundation, incorporated herein by reference.
*/
#include <linux/netdevice.h>
#include <linux/module.h>
#include <linux/delay.h>
#include <linux/kernel_stat.h>
#include <linux/pci.h>
#include <linux/ethtool.h>
#include <linux/ip.h>
#include <linux/in.h>
#include <linux/udp.h>
#include <linux/rtnetlink.h>
#include <asm/io.h>
#include "net_driver.h"
#include "ethtool.h"
#include "efx.h"
#include "falcon.h"
#include "selftest.h"
#include "boards.h"
#include "workarounds.h"
#include "mac.h"
/*
* Loopback test packet structure
*
* The self-test should stress every RSS vector, and unfortunately
* Falcon only performs RSS on TCP/UDP packets.
*/
struct efx_loopback_payload {
struct ethhdr header;
struct iphdr ip;
struct udphdr udp;
__be16 iteration;
const char msg[64];
} __attribute__ ((packed));
/* Loopback test source MAC address */
static const unsigned char payload_source[ETH_ALEN] = {
0x00, 0x0f, 0x53, 0x1b, 0x1b, 0x1b,
};
static const char *payload_msg =
"Hello world! This is an Efx loopback test in progress!";
/**
* efx_selftest_state - persistent state during a selftest
* @flush: Drop all packets in efx_loopback_rx_packet
* @packet_count: Number of packets being used in this test
* @skbs: An array of skbs transmitted
* @rx_good: RX good packet count
* @rx_bad: RX bad packet count
* @payload: Payload used in tests
*/
struct efx_selftest_state {
int flush;
int packet_count;
struct sk_buff **skbs;
atomic_t rx_good;
atomic_t rx_bad;
struct efx_loopback_payload payload;
};
/**************************************************************************
*
* Configurable values
*
**************************************************************************/
/* Level of loopback testing
*
* The maximum packet burst length is 16**(n-1), i.e.
*
* - Level 0 : no packets
* - Level 1 : 1 packet
* - Level 2 : 17 packets (1 * 1 packet, 1 * 16 packets)
* - Level 3 : 273 packets (1 * 1 packet, 1 * 16 packet, 1 * 256 packets)
*
*/
static unsigned int loopback_test_level = 3;
/**************************************************************************
*
* Interrupt and event queue testing
*
**************************************************************************/
/* Test generation and receipt of interrupts */
static int efx_test_interrupts(struct efx_nic *efx,
struct efx_self_tests *tests)
{
struct efx_channel *channel;
EFX_LOG(efx, "testing interrupts\n");
tests->interrupt = -1;
/* Reset interrupt flag */
efx->last_irq_cpu = -1;
smp_wmb();
/* ACK each interrupting event queue. Receiving an interrupt due to
* traffic before a test event is raised is considered a pass */
efx_for_each_channel_with_interrupt(channel, efx) {
if (channel->work_pending)
efx_process_channel_now(channel);
if (efx->last_irq_cpu >= 0)
goto success;
}
falcon_generate_interrupt(efx);
/* Wait for arrival of test interrupt. */
EFX_LOG(efx, "waiting for test interrupt\n");
schedule_timeout_uninterruptible(HZ / 10);
if (efx->last_irq_cpu >= 0)
goto success;
EFX_ERR(efx, "timed out waiting for interrupt\n");
return -ETIMEDOUT;
success:
EFX_LOG(efx, "test interrupt (mode %d) seen on CPU%d\n",
efx->interrupt_mode, efx->last_irq_cpu);
tests->interrupt = 1;
return 0;
}
/* Test generation and receipt of non-interrupting events */
static int efx_test_eventq(struct efx_channel *channel,
struct efx_self_tests *tests)
{
unsigned int magic;
/* Channel specific code, limited to 20 bits */
magic = (0x00010150 + channel->channel);
EFX_LOG(channel->efx, "channel %d testing event queue with code %x\n",
channel->channel, magic);
tests->eventq_dma[channel->channel] = -1;
tests->eventq_int[channel->channel] = 1; /* fake pass */
tests->eventq_poll[channel->channel] = 1; /* fake pass */
/* Reset flag and zero magic word */
channel->efx->last_irq_cpu = -1;
channel->eventq_magic = 0;
smp_wmb();
falcon_generate_test_event(channel, magic);
udelay(1);
efx_process_channel_now(channel);
if (channel->eventq_magic != magic) {
EFX_ERR(channel->efx, "channel %d failed to see test event\n",
channel->channel);
return -ETIMEDOUT;
} else {
tests->eventq_dma[channel->channel] = 1;
}
return 0;
}
/* Test generation and receipt of interrupting events */
static int efx_test_eventq_irq(struct efx_channel *channel,
struct efx_self_tests *tests)
{
unsigned int magic, count;
/* Channel specific code, limited to 20 bits */
magic = (0x00010150 + channel->channel);
EFX_LOG(channel->efx, "channel %d testing event queue with code %x\n",
channel->channel, magic);
tests->eventq_dma[channel->channel] = -1;
tests->eventq_int[channel->channel] = -1;
tests->eventq_poll[channel->channel] = -1;
/* Reset flag and zero magic word */
channel->efx->last_irq_cpu = -1;
channel->eventq_magic = 0;
smp_wmb();
falcon_generate_test_event(channel, magic);
/* Wait for arrival of interrupt */
count = 0;
do {
schedule_timeout_uninterruptible(HZ / 100);
if (channel->work_pending)
efx_process_channel_now(channel);
if (channel->eventq_magic == magic)
goto eventq_ok;
} while (++count < 2);
EFX_ERR(channel->efx, "channel %d timed out waiting for event queue\n",
channel->channel);
/* See if interrupt arrived */
if (channel->efx->last_irq_cpu >= 0) {
EFX_ERR(channel->efx, "channel %d saw interrupt on CPU%d "
"during event queue test\n", channel->channel,
raw_smp_processor_id());
tests->eventq_int[channel->channel] = 1;
}
/* Check to see if event was received even if interrupt wasn't */
efx_process_channel_now(channel);
if (channel->eventq_magic == magic) {
EFX_ERR(channel->efx, "channel %d event was generated, but "
"failed to trigger an interrupt\n", channel->channel);
tests->eventq_dma[channel->channel] = 1;
}
return -ETIMEDOUT;
eventq_ok:
EFX_LOG(channel->efx, "channel %d event queue passed\n",
channel->channel);
tests->eventq_dma[channel->channel] = 1;
tests->eventq_int[channel->channel] = 1;
tests->eventq_poll[channel->channel] = 1;
return 0;
}
/**************************************************************************
*
* PHY testing
*
**************************************************************************/
/* Check PHY presence by reading the PHY ID registers */
static int efx_test_phy(struct efx_nic *efx,
struct efx_self_tests *tests)
{
u16 physid1, physid2;
struct mii_if_info *mii = &efx->mii;
struct net_device *net_dev = efx->net_dev;
if (efx->phy_type == PHY_TYPE_NONE)
return 0;
EFX_LOG(efx, "testing PHY presence\n");
tests->phy_ok = -1;
physid1 = mii->mdio_read(net_dev, mii->phy_id, MII_PHYSID1);
physid2 = mii->mdio_read(net_dev, mii->phy_id, MII_PHYSID2);
if ((physid1 != 0x0000) && (physid1 != 0xffff) &&
(physid2 != 0x0000) && (physid2 != 0xffff)) {
EFX_LOG(efx, "found MII PHY %d ID 0x%x:%x\n",
mii->phy_id, physid1, physid2);
tests->phy_ok = 1;
return 0;
}
EFX_ERR(efx, "no MII PHY present with ID %d\n", mii->phy_id);
return -ENODEV;
}
/**************************************************************************
*
* Loopback testing
* NB Only one loopback test can be executing concurrently.
*
**************************************************************************/
/* Loopback test RX callback
* This is called for each received packet during loopback testing.
*/
void efx_loopback_rx_packet(struct efx_nic *efx,
const char *buf_ptr, int pkt_len)
{
struct efx_selftest_state *state = efx->loopback_selftest;
struct efx_loopback_payload *received;
struct efx_loopback_payload *payload;
BUG_ON(!buf_ptr);
/* If we are just flushing, then drop the packet */
if ((state == NULL) || state->flush)
return;
payload = &state->payload;
received = (struct efx_loopback_payload *) buf_ptr;
received->ip.saddr = payload->ip.saddr;
received->ip.check = payload->ip.check;
/* Check that header exists */
if (pkt_len < sizeof(received->header)) {
EFX_ERR(efx, "saw runt RX packet (length %d) in %s loopback "
"test\n", pkt_len, LOOPBACK_MODE(efx));
goto err;
}
/* Check that the ethernet header exists */
if (memcmp(&received->header, &payload->header, ETH_HLEN) != 0) {
EFX_ERR(efx, "saw non-loopback RX packet in %s loopback test\n",
LOOPBACK_MODE(efx));
goto err;
}
/* Check packet length */
if (pkt_len != sizeof(*payload)) {
EFX_ERR(efx, "saw incorrect RX packet length %d (wanted %d) in "
"%s loopback test\n", pkt_len, (int)sizeof(*payload),
LOOPBACK_MODE(efx));
goto err;
}
/* Check that IP header matches */
if (memcmp(&received->ip, &payload->ip, sizeof(payload->ip)) != 0) {
EFX_ERR(efx, "saw corrupted IP header in %s loopback test\n",
LOOPBACK_MODE(efx));
goto err;
}
/* Check that msg and padding matches */
if (memcmp(&received->msg, &payload->msg, sizeof(received->msg)) != 0) {
EFX_ERR(efx, "saw corrupted RX packet in %s loopback test\n",
LOOPBACK_MODE(efx));
goto err;
}
/* Check that iteration matches */
if (received->iteration != payload->iteration) {
EFX_ERR(efx, "saw RX packet from iteration %d (wanted %d) in "
"%s loopback test\n", ntohs(received->iteration),
ntohs(payload->iteration), LOOPBACK_MODE(efx));
goto err;
}
/* Increase correct RX count */
EFX_TRACE(efx, "got loopback RX in %s loopback test\n",
LOOPBACK_MODE(efx));
atomic_inc(&state->rx_good);
return;
err:
#ifdef EFX_ENABLE_DEBUG
if (atomic_read(&state->rx_bad) == 0) {
EFX_ERR(efx, "received packet:\n");
print_hex_dump(KERN_ERR, "", DUMP_PREFIX_OFFSET, 0x10, 1,
buf_ptr, pkt_len, 0);
EFX_ERR(efx, "expected packet:\n");
print_hex_dump(KERN_ERR, "", DUMP_PREFIX_OFFSET, 0x10, 1,
&state->payload, sizeof(state->payload), 0);
}
#endif
atomic_inc(&state->rx_bad);
}
/* Initialise an efx_selftest_state for a new iteration */
static void efx_iterate_state(struct efx_nic *efx)
{
struct efx_selftest_state *state = efx->loopback_selftest;
struct net_device *net_dev = efx->net_dev;
struct efx_loopback_payload *payload = &state->payload;
/* Initialise the layerII header */
memcpy(&payload->header.h_dest, net_dev->dev_addr, ETH_ALEN);
memcpy(&payload->header.h_source, &payload_source, ETH_ALEN);
payload->header.h_proto = htons(ETH_P_IP);
/* saddr set later and used as incrementing count */
payload->ip.daddr = htonl(INADDR_LOOPBACK);
payload->ip.ihl = 5;
payload->ip.check = htons(0xdead);
payload->ip.tot_len = htons(sizeof(*payload) - sizeof(struct ethhdr));
payload->ip.version = IPVERSION;
payload->ip.protocol = IPPROTO_UDP;
/* Initialise udp header */
payload->udp.source = 0;
payload->udp.len = htons(sizeof(*payload) - sizeof(struct ethhdr) -
sizeof(struct iphdr));
payload->udp.check = 0; /* checksum ignored */
/* Fill out payload */
payload->iteration = htons(ntohs(payload->iteration) + 1);
memcpy(&payload->msg, payload_msg, sizeof(payload_msg));
/* Fill out remaining state members */
atomic_set(&state->rx_good, 0);
atomic_set(&state->rx_bad, 0);
smp_wmb();
}
static int efx_tx_loopback(struct efx_tx_queue *tx_queue)
{
struct efx_nic *efx = tx_queue->efx;
struct efx_selftest_state *state = efx->loopback_selftest;
struct efx_loopback_payload *payload;
struct sk_buff *skb;
int i, rc;
/* Transmit N copies of buffer */
for (i = 0; i < state->packet_count; i++) {
/* Allocate an skb, holding an extra reference for
* transmit completion counting */
skb = alloc_skb(sizeof(state->payload), GFP_KERNEL);
if (!skb)
return -ENOMEM;
state->skbs[i] = skb;
skb_get(skb);
/* Copy the payload in, incrementing the source address to
* exercise the rss vectors */
payload = ((struct efx_loopback_payload *)
skb_put(skb, sizeof(state->payload)));
memcpy(payload, &state->payload, sizeof(state->payload));
payload->ip.saddr = htonl(INADDR_LOOPBACK | (i << 2));
/* Ensure everything we've written is visible to the
* interrupt handler. */
smp_wmb();
if (efx_dev_registered(efx))
netif_tx_lock_bh(efx->net_dev);
rc = efx_xmit(efx, tx_queue, skb);
if (efx_dev_registered(efx))
netif_tx_unlock_bh(efx->net_dev);
if (rc != NETDEV_TX_OK) {
EFX_ERR(efx, "TX queue %d could not transmit packet %d "
"of %d in %s loopback test\n", tx_queue->queue,
i + 1, state->packet_count, LOOPBACK_MODE(efx));
/* Defer cleaning up the other skbs for the caller */
kfree_skb(skb);
return -EPIPE;
}
}
return 0;
}
static int efx_rx_loopback(struct efx_tx_queue *tx_queue,
struct efx_loopback_self_tests *lb_tests)
{
struct efx_nic *efx = tx_queue->efx;
struct efx_selftest_state *state = efx->loopback_selftest;
struct sk_buff *skb;
int tx_done = 0, rx_good, rx_bad;
int i, rc = 0;
if (efx_dev_registered(efx))
netif_tx_lock_bh(efx->net_dev);
/* Count the number of tx completions, and decrement the refcnt. Any
* skbs not already completed will be free'd when the queue is flushed */
for (i=0; i < state->packet_count; i++) {
skb = state->skbs[i];
if (skb && !skb_shared(skb))
++tx_done;
dev_kfree_skb_any(skb);
}
if (efx_dev_registered(efx))
netif_tx_unlock_bh(efx->net_dev);
/* Check TX completion and received packet counts */
rx_good = atomic_read(&state->rx_good);
rx_bad = atomic_read(&state->rx_bad);
if (tx_done != state->packet_count) {
/* Don't free the skbs; they will be picked up on TX
* overflow or channel teardown.
*/
EFX_ERR(efx, "TX queue %d saw only %d out of an expected %d "
"TX completion events in %s loopback test\n",
tx_queue->queue, tx_done, state->packet_count,
LOOPBACK_MODE(efx));
rc = -ETIMEDOUT;
/* Allow to fall through so we see the RX errors as well */
}
/* We may always be up to a flush away from our desired packet total */
if (rx_good != state->packet_count) {
EFX_LOG(efx, "TX queue %d saw only %d out of an expected %d "
"received packets in %s loopback test\n",
tx_queue->queue, rx_good, state->packet_count,
LOOPBACK_MODE(efx));
rc = -ETIMEDOUT;
/* Fall through */
}
/* Update loopback test structure */
lb_tests->tx_sent[tx_queue->queue] += state->packet_count;
lb_tests->tx_done[tx_queue->queue] += tx_done;
lb_tests->rx_good += rx_good;
lb_tests->rx_bad += rx_bad;
return rc;
}
static int
efx_test_loopback(struct efx_tx_queue *tx_queue,
struct efx_loopback_self_tests *lb_tests)
{
struct efx_nic *efx = tx_queue->efx;
struct efx_selftest_state *state = efx->loopback_selftest;
struct efx_channel *channel;
int i, rc = 0;
for (i = 0; i < loopback_test_level; i++) {
/* Determine how many packets to send */
state->packet_count = (efx->type->txd_ring_mask + 1) / 3;
state->packet_count = min(1 << (i << 2), state->packet_count);
state->skbs = kzalloc(sizeof(state->skbs[0]) *
state->packet_count, GFP_KERNEL);
if (!state->skbs)
return -ENOMEM;
state->flush = 0;
EFX_LOG(efx, "TX queue %d testing %s loopback with %d "
"packets\n", tx_queue->queue, LOOPBACK_MODE(efx),
state->packet_count);
efx_iterate_state(efx);
rc = efx_tx_loopback(tx_queue);
/* NAPI polling is not enabled, so process channels synchronously */
schedule_timeout_uninterruptible(HZ / 50);
efx_for_each_channel_with_interrupt(channel, efx) {
if (channel->work_pending)
efx_process_channel_now(channel);
}
rc |= efx_rx_loopback(tx_queue, lb_tests);
kfree(state->skbs);
if (rc) {
/* Wait a while to ensure there are no packets
* floating around after a failure. */
schedule_timeout_uninterruptible(HZ / 10);
return rc;
}
}
EFX_LOG(efx, "TX queue %d passed %s loopback test with a burst length "
"of %d packets\n", tx_queue->queue, LOOPBACK_MODE(efx),
state->packet_count);
return rc;
}
static int efx_test_loopbacks(struct efx_nic *efx,
struct efx_self_tests *tests,
unsigned int loopback_modes)
{
struct efx_selftest_state *state = efx->loopback_selftest;
struct ethtool_cmd ecmd, ecmd_loopback;
struct efx_tx_queue *tx_queue;
enum efx_loopback_mode old_mode, mode;
int count, rc = 0, link_up;
rc = efx_ethtool_get_settings(efx->net_dev, &ecmd);
if (rc) {
EFX_ERR(efx, "could not get GMII settings\n");
return rc;
}
old_mode = efx->loopback_mode;
/* Disable autonegotiation for the purposes of loopback */
memcpy(&ecmd_loopback, &ecmd, sizeof(ecmd_loopback));
if (ecmd_loopback.autoneg == AUTONEG_ENABLE) {
ecmd_loopback.autoneg = AUTONEG_DISABLE;
ecmd_loopback.duplex = DUPLEX_FULL;
ecmd_loopback.speed = SPEED_10000;
}
rc = efx_ethtool_set_settings(efx->net_dev, &ecmd_loopback);
if (rc) {
EFX_ERR(efx, "could not disable autonegotiation\n");
goto out;
}
tests->loopback_speed = ecmd_loopback.speed;
tests->loopback_full_duplex = ecmd_loopback.duplex;
/* Test all supported loopback modes */
for (mode = LOOPBACK_NONE; mode < LOOPBACK_TEST_MAX; mode++) {
if (!(loopback_modes & (1 << mode)))
continue;
/* Move the port into the specified loopback mode. */
state->flush = 1;
efx->loopback_mode = mode;
efx_reconfigure_port(efx);
/* Wait for the PHY to signal the link is up */
count = 0;
do {
struct efx_channel *channel = &efx->channel[0];
falcon_check_xmac(efx);
schedule_timeout_uninterruptible(HZ / 10);
if (channel->work_pending)
efx_process_channel_now(channel);
/* Wait for PHY events to be processed */
flush_workqueue(efx->workqueue);
rmb();
/* efx->link_up can be 1 even if the XAUI link is down,
* (bug5762). Usually, it's not worth bothering with the
* difference, but for selftests, we need that extra
* guarantee that the link is really, really, up.
*/
link_up = efx->link_up;
if (!falcon_xaui_link_ok(efx))
link_up = 0;
} while ((++count < 20) && !link_up);
/* The link should now be up. If it isn't, there is no point
* in attempting a loopback test */
if (!link_up) {
EFX_ERR(efx, "loopback %s never came up\n",
LOOPBACK_MODE(efx));
rc = -EIO;
goto out;
}
EFX_LOG(efx, "link came up in %s loopback in %d iterations\n",
LOOPBACK_MODE(efx), count);
/* Test every TX queue */
efx_for_each_tx_queue(tx_queue, efx) {
rc |= efx_test_loopback(tx_queue,
&tests->loopback[mode]);
if (rc)
goto out;
}
}
out:
/* Take out of loopback and restore PHY settings */
state->flush = 1;
efx->loopback_mode = old_mode;
efx_ethtool_set_settings(efx->net_dev, &ecmd);
return rc;
}
/**************************************************************************
*
* Entry points
*
*************************************************************************/
/* Online (i.e. non-disruptive) testing
* This checks interrupt generation, event delivery and PHY presence. */
int efx_online_test(struct efx_nic *efx, struct efx_self_tests *tests)
{
struct efx_channel *channel;
int rc = 0;
EFX_LOG(efx, "performing online self-tests\n");
rc |= efx_test_interrupts(efx, tests);
efx_for_each_channel(channel, efx) {
if (channel->has_interrupt)
rc |= efx_test_eventq_irq(channel, tests);
else
rc |= efx_test_eventq(channel, tests);
}
rc |= efx_test_phy(efx, tests);
if (rc)
EFX_ERR(efx, "failed online self-tests\n");
return rc;
}
/* Offline (i.e. disruptive) testing
* This checks MAC and PHY loopback on the specified port. */
int efx_offline_test(struct efx_nic *efx,
struct efx_self_tests *tests, unsigned int loopback_modes)
{
struct efx_selftest_state *state;
int rc = 0;
EFX_LOG(efx, "performing offline self-tests\n");
/* Create a selftest_state structure to hold state for the test */
state = kzalloc(sizeof(*state), GFP_KERNEL);
if (state == NULL) {
rc = -ENOMEM;
goto out;
}
/* Set the port loopback_selftest member. From this point on
* all received packets will be dropped. Mark the state as
* "flushing" so all inflight packets are dropped */
BUG_ON(efx->loopback_selftest);
state->flush = 1;
efx->loopback_selftest = state;
rc = efx_test_loopbacks(efx, tests, loopback_modes);
efx->loopback_selftest = NULL;
wmb();
kfree(state);
out:
if (rc)
EFX_ERR(efx, "failed offline self-tests\n");
return rc;
}
