1
/****************************************************************************
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* Driver for Solarflare Solarstorm network controllers and boards
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* Copyright 2005-2006 Fen Systems Ltd.
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* Copyright 2006-2010 Solarflare Communications Inc.
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 as published
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* by the Free Software Foundation, incorporated herein by reference.
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#include <linux/netdevice.h>
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#include <linux/module.h>
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#include <linux/delay.h>
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#include <linux/kernel_stat.h>
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#include <linux/pci.h>
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#include <linux/ethtool.h>
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#include <linux/udp.h>
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#include <linux/rtnetlink.h>
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#include <linux/slab.h>
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#include "net_driver.h"
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#include "workarounds.h"
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* Loopback test packet structure
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* The self-test should stress every RSS vector, and unfortunately
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* Falcon only performs RSS on TCP/UDP packets.
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struct efx_loopback_payload {
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/* Loopback test source MAC address */
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static const unsigned char payload_source[ETH_ALEN] = {
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0x00, 0x0f, 0x53, 0x1b, 0x1b, 0x1b,
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static const char payload_msg[] =
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"Hello world! This is an Efx loopback test in progress!";
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/* Interrupt mode names */
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static const unsigned int efx_interrupt_mode_max = EFX_INT_MODE_MAX;
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static const char *efx_interrupt_mode_names[] = {
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[EFX_INT_MODE_MSIX] = "MSI-X",
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[EFX_INT_MODE_MSI] = "MSI",
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[EFX_INT_MODE_LEGACY] = "legacy",
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#define INT_MODE(efx) \
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STRING_TABLE_LOOKUP(efx->interrupt_mode, efx_interrupt_mode)
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* efx_loopback_state - persistent state during a loopback selftest
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* @flush: Drop all packets in efx_loopback_rx_packet
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* @packet_count: Number of packets being used in this test
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* @skbs: An array of skbs transmitted
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* @offload_csum: Checksums are being offloaded
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* @rx_good: RX good packet count
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* @rx_bad: RX bad packet count
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* @payload: Payload used in tests
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struct efx_loopback_state {
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struct sk_buff **skbs;
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struct efx_loopback_payload payload;
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/**************************************************************************
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* MII, NVRAM and register tests
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**************************************************************************/
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static int efx_test_phy_alive(struct efx_nic *efx, struct efx_self_tests *tests)
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if (efx->phy_op->test_alive) {
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rc = efx->phy_op->test_alive(efx);
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tests->phy_alive = rc ? -1 : 1;
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static int efx_test_nvram(struct efx_nic *efx, struct efx_self_tests *tests)
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if (efx->type->test_nvram) {
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rc = efx->type->test_nvram(efx);
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tests->nvram = rc ? -1 : 1;
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static int efx_test_chip(struct efx_nic *efx, struct efx_self_tests *tests)
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/* Test register access */
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if (efx->type->test_registers) {
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rc = efx->type->test_registers(efx);
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tests->registers = rc ? -1 : 1;
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/**************************************************************************
126
* Interrupt and event queue testing
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**************************************************************************/
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/* Test generation and receipt of interrupts */
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static int efx_test_interrupts(struct efx_nic *efx,
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struct efx_self_tests *tests)
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netif_dbg(efx, drv, efx->net_dev, "testing interrupts\n");
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tests->interrupt = -1;
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/* Reset interrupt flag */
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efx->last_irq_cpu = -1;
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efx_nic_generate_interrupt(efx);
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/* Wait for arrival of test interrupt. */
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netif_dbg(efx, drv, efx->net_dev, "waiting for test interrupt\n");
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schedule_timeout_uninterruptible(HZ / 10);
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if (efx->last_irq_cpu >= 0)
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netif_err(efx, drv, efx->net_dev, "timed out waiting for interrupt\n");
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netif_dbg(efx, drv, efx->net_dev, "%s test interrupt seen on CPU%d\n",
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tests->interrupt = 1;
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/* Test generation and receipt of interrupting events */
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static int efx_test_eventq_irq(struct efx_channel *channel,
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struct efx_self_tests *tests)
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struct efx_nic *efx = channel->efx;
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unsigned int read_ptr, count;
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tests->eventq_dma[channel->channel] = -1;
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tests->eventq_int[channel->channel] = -1;
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tests->eventq_poll[channel->channel] = -1;
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read_ptr = channel->eventq_read_ptr;
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channel->efx->last_irq_cpu = -1;
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efx_nic_generate_test_event(channel);
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/* Wait for arrival of interrupt */
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schedule_timeout_uninterruptible(HZ / 100);
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if (ACCESS_ONCE(channel->eventq_read_ptr) != read_ptr)
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} while (++count < 2);
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netif_err(efx, drv, efx->net_dev,
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"channel %d timed out waiting for event queue\n",
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/* See if interrupt arrived */
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if (channel->efx->last_irq_cpu >= 0) {
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netif_err(efx, drv, efx->net_dev,
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"channel %d saw interrupt on CPU%d "
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"during event queue test\n", channel->channel,
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raw_smp_processor_id());
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tests->eventq_int[channel->channel] = 1;
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/* Check to see if event was received even if interrupt wasn't */
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if (efx_nic_event_present(channel)) {
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netif_err(efx, drv, efx->net_dev,
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"channel %d event was generated, but "
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"failed to trigger an interrupt\n", channel->channel);
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tests->eventq_dma[channel->channel] = 1;
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netif_dbg(efx, drv, efx->net_dev, "channel %d event queue passed\n",
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tests->eventq_dma[channel->channel] = 1;
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tests->eventq_int[channel->channel] = 1;
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tests->eventq_poll[channel->channel] = 1;
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static int efx_test_phy(struct efx_nic *efx, struct efx_self_tests *tests,
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if (!efx->phy_op->run_tests)
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mutex_lock(&efx->mac_lock);
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rc = efx->phy_op->run_tests(efx, tests->phy_ext, flags);
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mutex_unlock(&efx->mac_lock);
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/**************************************************************************
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* NB Only one loopback test can be executing concurrently.
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**************************************************************************/
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/* Loopback test RX callback
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* This is called for each received packet during loopback testing.
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void efx_loopback_rx_packet(struct efx_nic *efx,
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const char *buf_ptr, int pkt_len)
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struct efx_loopback_state *state = efx->loopback_selftest;
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struct efx_loopback_payload *received;
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struct efx_loopback_payload *payload;
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/* If we are just flushing, then drop the packet */
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if ((state == NULL) || state->flush)
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payload = &state->payload;
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received = (struct efx_loopback_payload *) buf_ptr;
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received->ip.saddr = payload->ip.saddr;
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if (state->offload_csum)
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received->ip.check = payload->ip.check;
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/* Check that header exists */
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if (pkt_len < sizeof(received->header)) {
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netif_err(efx, drv, efx->net_dev,
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"saw runt RX packet (length %d) in %s loopback "
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"test\n", pkt_len, LOOPBACK_MODE(efx));
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/* Check that the ethernet header exists */
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if (memcmp(&received->header, &payload->header, ETH_HLEN) != 0) {
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netif_err(efx, drv, efx->net_dev,
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"saw non-loopback RX packet in %s loopback test\n",
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/* Check packet length */
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if (pkt_len != sizeof(*payload)) {
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netif_err(efx, drv, efx->net_dev,
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"saw incorrect RX packet length %d (wanted %d) in "
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"%s loopback test\n", pkt_len, (int)sizeof(*payload),
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/* Check that IP header matches */
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if (memcmp(&received->ip, &payload->ip, sizeof(payload->ip)) != 0) {
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netif_err(efx, drv, efx->net_dev,
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"saw corrupted IP header in %s loopback test\n",
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/* Check that msg and padding matches */
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if (memcmp(&received->msg, &payload->msg, sizeof(received->msg)) != 0) {
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netif_err(efx, drv, efx->net_dev,
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"saw corrupted RX packet in %s loopback test\n",
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/* Check that iteration matches */
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if (received->iteration != payload->iteration) {
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netif_err(efx, drv, efx->net_dev,
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"saw RX packet from iteration %d (wanted %d) in "
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"%s loopback test\n", ntohs(received->iteration),
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ntohs(payload->iteration), LOOPBACK_MODE(efx));
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/* Increase correct RX count */
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netif_vdbg(efx, drv, efx->net_dev,
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"got loopback RX in %s loopback test\n", LOOPBACK_MODE(efx));
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atomic_inc(&state->rx_good);
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#ifdef EFX_ENABLE_DEBUG
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if (atomic_read(&state->rx_bad) == 0) {
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netif_err(efx, drv, efx->net_dev, "received packet:\n");
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print_hex_dump(KERN_ERR, "", DUMP_PREFIX_OFFSET, 0x10, 1,
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buf_ptr, pkt_len, 0);
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netif_err(efx, drv, efx->net_dev, "expected packet:\n");
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print_hex_dump(KERN_ERR, "", DUMP_PREFIX_OFFSET, 0x10, 1,
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&state->payload, sizeof(state->payload), 0);
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atomic_inc(&state->rx_bad);
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/* Initialise an efx_selftest_state for a new iteration */
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static void efx_iterate_state(struct efx_nic *efx)
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struct efx_loopback_state *state = efx->loopback_selftest;
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struct net_device *net_dev = efx->net_dev;
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struct efx_loopback_payload *payload = &state->payload;
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/* Initialise the layerII header */
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memcpy(&payload->header.h_dest, net_dev->dev_addr, ETH_ALEN);
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memcpy(&payload->header.h_source, &payload_source, ETH_ALEN);
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payload->header.h_proto = htons(ETH_P_IP);
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/* saddr set later and used as incrementing count */
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payload->ip.daddr = htonl(INADDR_LOOPBACK);
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payload->ip.check = htons(0xdead);
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payload->ip.tot_len = htons(sizeof(*payload) - sizeof(struct ethhdr));
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payload->ip.version = IPVERSION;
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payload->ip.protocol = IPPROTO_UDP;
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/* Initialise udp header */
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payload->udp.source = 0;
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payload->udp.len = htons(sizeof(*payload) - sizeof(struct ethhdr) -
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sizeof(struct iphdr));
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payload->udp.check = 0; /* checksum ignored */
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/* Fill out payload */
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payload->iteration = htons(ntohs(payload->iteration) + 1);
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memcpy(&payload->msg, payload_msg, sizeof(payload_msg));
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/* Fill out remaining state members */
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atomic_set(&state->rx_good, 0);
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atomic_set(&state->rx_bad, 0);
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static int efx_begin_loopback(struct efx_tx_queue *tx_queue)
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struct efx_nic *efx = tx_queue->efx;
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struct efx_loopback_state *state = efx->loopback_selftest;
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struct efx_loopback_payload *payload;
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/* Transmit N copies of buffer */
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for (i = 0; i < state->packet_count; i++) {
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/* Allocate an skb, holding an extra reference for
380
* transmit completion counting */
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skb = alloc_skb(sizeof(state->payload), GFP_KERNEL);
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state->skbs[i] = skb;
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/* Copy the payload in, incrementing the source address to
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* exercise the rss vectors */
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payload = ((struct efx_loopback_payload *)
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skb_put(skb, sizeof(state->payload)));
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memcpy(payload, &state->payload, sizeof(state->payload));
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payload->ip.saddr = htonl(INADDR_LOOPBACK | (i << 2));
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/* Ensure everything we've written is visible to the
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* interrupt handler. */
398
if (efx_dev_registered(efx))
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netif_tx_lock_bh(efx->net_dev);
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rc = efx_enqueue_skb(tx_queue, skb);
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if (efx_dev_registered(efx))
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netif_tx_unlock_bh(efx->net_dev);
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if (rc != NETDEV_TX_OK) {
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netif_err(efx, drv, efx->net_dev,
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"TX queue %d could not transmit packet %d of "
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"%d in %s loopback test\n", tx_queue->queue,
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i + 1, state->packet_count,
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/* Defer cleaning up the other skbs for the caller */
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static int efx_poll_loopback(struct efx_nic *efx)
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struct efx_loopback_state *state = efx->loopback_selftest;
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struct efx_channel *channel;
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/* NAPI polling is not enabled, so process channels
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efx_for_each_channel(channel, efx) {
428
if (channel->work_pending)
429
efx_process_channel_now(channel);
431
return atomic_read(&state->rx_good) == state->packet_count;
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static int efx_end_loopback(struct efx_tx_queue *tx_queue,
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struct efx_loopback_self_tests *lb_tests)
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struct efx_nic *efx = tx_queue->efx;
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struct efx_loopback_state *state = efx->loopback_selftest;
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int tx_done = 0, rx_good, rx_bad;
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if (efx_dev_registered(efx))
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netif_tx_lock_bh(efx->net_dev);
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/* Count the number of tx completions, and decrement the refcnt. Any
447
* skbs not already completed will be free'd when the queue is flushed */
448
for (i=0; i < state->packet_count; i++) {
449
skb = state->skbs[i];
450
if (skb && !skb_shared(skb))
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dev_kfree_skb_any(skb);
455
if (efx_dev_registered(efx))
456
netif_tx_unlock_bh(efx->net_dev);
458
/* Check TX completion and received packet counts */
459
rx_good = atomic_read(&state->rx_good);
460
rx_bad = atomic_read(&state->rx_bad);
461
if (tx_done != state->packet_count) {
462
/* Don't free the skbs; they will be picked up on TX
463
* overflow or channel teardown.
465
netif_err(efx, drv, efx->net_dev,
466
"TX queue %d saw only %d out of an expected %d "
467
"TX completion events in %s loopback test\n",
468
tx_queue->queue, tx_done, state->packet_count,
471
/* Allow to fall through so we see the RX errors as well */
474
/* We may always be up to a flush away from our desired packet total */
475
if (rx_good != state->packet_count) {
476
netif_dbg(efx, drv, efx->net_dev,
477
"TX queue %d saw only %d out of an expected %d "
478
"received packets in %s loopback test\n",
479
tx_queue->queue, rx_good, state->packet_count,
485
/* Update loopback test structure */
486
lb_tests->tx_sent[tx_queue->queue] += state->packet_count;
487
lb_tests->tx_done[tx_queue->queue] += tx_done;
488
lb_tests->rx_good += rx_good;
489
lb_tests->rx_bad += rx_bad;
495
efx_test_loopback(struct efx_tx_queue *tx_queue,
496
struct efx_loopback_self_tests *lb_tests)
498
struct efx_nic *efx = tx_queue->efx;
499
struct efx_loopback_state *state = efx->loopback_selftest;
500
int i, begin_rc, end_rc;
502
for (i = 0; i < 3; i++) {
503
/* Determine how many packets to send */
504
state->packet_count = efx->txq_entries / 3;
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state->packet_count = min(1 << (i << 2), state->packet_count);
506
state->skbs = kzalloc(sizeof(state->skbs[0]) *
507
state->packet_count, GFP_KERNEL);
510
state->flush = false;
512
netif_dbg(efx, drv, efx->net_dev,
513
"TX queue %d testing %s loopback with %d packets\n",
514
tx_queue->queue, LOOPBACK_MODE(efx),
515
state->packet_count);
517
efx_iterate_state(efx);
518
begin_rc = efx_begin_loopback(tx_queue);
520
/* This will normally complete very quickly, but be
521
* prepared to wait up to 100 ms. */
523
if (!efx_poll_loopback(efx)) {
525
efx_poll_loopback(efx);
528
end_rc = efx_end_loopback(tx_queue, lb_tests);
531
if (begin_rc || end_rc) {
532
/* Wait a while to ensure there are no packets
533
* floating around after a failure. */
534
schedule_timeout_uninterruptible(HZ / 10);
535
return begin_rc ? begin_rc : end_rc;
539
netif_dbg(efx, drv, efx->net_dev,
540
"TX queue %d passed %s loopback test with a burst length "
541
"of %d packets\n", tx_queue->queue, LOOPBACK_MODE(efx),
542
state->packet_count);
547
/* Wait for link up. On Falcon, we would prefer to rely on efx_monitor, but
548
* any contention on the mac lock (via e.g. efx_mac_mcast_work) causes it
549
* to delay and retry. Therefore, it's safer to just poll directly. Wait
550
* for link up and any faults to dissipate. */
551
static int efx_wait_for_link(struct efx_nic *efx)
553
struct efx_link_state *link_state = &efx->link_state;
554
int count, link_up_count = 0;
557
for (count = 0; count < 40; count++) {
558
schedule_timeout_uninterruptible(HZ / 10);
560
if (efx->type->monitor != NULL) {
561
mutex_lock(&efx->mac_lock);
562
efx->type->monitor(efx);
563
mutex_unlock(&efx->mac_lock);
565
struct efx_channel *channel = efx_get_channel(efx, 0);
566
if (channel->work_pending)
567
efx_process_channel_now(channel);
570
mutex_lock(&efx->mac_lock);
571
link_up = link_state->up;
573
link_up = !efx->mac_op->check_fault(efx);
574
mutex_unlock(&efx->mac_lock);
577
if (++link_up_count == 2)
587
static int efx_test_loopbacks(struct efx_nic *efx, struct efx_self_tests *tests,
588
unsigned int loopback_modes)
590
enum efx_loopback_mode mode;
591
struct efx_loopback_state *state;
592
struct efx_channel *channel = efx_get_channel(efx, 0);
593
struct efx_tx_queue *tx_queue;
596
/* Set the port loopback_selftest member. From this point on
597
* all received packets will be dropped. Mark the state as
598
* "flushing" so all inflight packets are dropped */
599
state = kzalloc(sizeof(*state), GFP_KERNEL);
602
BUG_ON(efx->loopback_selftest);
604
efx->loopback_selftest = state;
606
/* Test all supported loopback modes */
607
for (mode = LOOPBACK_NONE; mode <= LOOPBACK_TEST_MAX; mode++) {
608
if (!(loopback_modes & (1 << mode)))
611
/* Move the port into the specified loopback mode. */
613
mutex_lock(&efx->mac_lock);
614
efx->loopback_mode = mode;
615
rc = __efx_reconfigure_port(efx);
616
mutex_unlock(&efx->mac_lock);
618
netif_err(efx, drv, efx->net_dev,
619
"unable to move into %s loopback\n",
624
rc = efx_wait_for_link(efx);
626
netif_err(efx, drv, efx->net_dev,
627
"loopback %s never came up\n",
632
/* Test all enabled types of TX queue */
633
efx_for_each_channel_tx_queue(tx_queue, channel) {
634
state->offload_csum = (tx_queue->queue &
635
EFX_TXQ_TYPE_OFFLOAD);
636
rc = efx_test_loopback(tx_queue,
637
&tests->loopback[mode]);
644
/* Remove the flush. The caller will remove the loopback setting */
646
efx->loopback_selftest = NULL;
653
/**************************************************************************
657
*************************************************************************/
659
int efx_selftest(struct efx_nic *efx, struct efx_self_tests *tests,
662
enum efx_loopback_mode loopback_mode = efx->loopback_mode;
663
int phy_mode = efx->phy_mode;
664
enum reset_type reset_method = RESET_TYPE_INVISIBLE;
665
struct efx_channel *channel;
666
int rc_test = 0, rc_reset = 0, rc;
668
/* Online (i.e. non-disruptive) testing
669
* This checks interrupt generation, event delivery and PHY presence. */
671
rc = efx_test_phy_alive(efx, tests);
675
rc = efx_test_nvram(efx, tests);
679
rc = efx_test_interrupts(efx, tests);
683
efx_for_each_channel(channel, efx) {
684
rc = efx_test_eventq_irq(channel, tests);
692
if (!(flags & ETH_TEST_FL_OFFLINE))
693
return efx_test_phy(efx, tests, flags);
695
/* Offline (i.e. disruptive) testing
696
* This checks MAC and PHY loopback on the specified port. */
698
/* Detach the device so the kernel doesn't transmit during the
699
* loopback test and the watchdog timeout doesn't fire.
701
netif_device_detach(efx->net_dev);
703
mutex_lock(&efx->mac_lock);
704
if (efx->loopback_modes) {
705
/* We need the 312 clock from the PHY to test the XMAC
706
* registers, so move into XGMII loopback if available */
707
if (efx->loopback_modes & (1 << LOOPBACK_XGMII))
708
efx->loopback_mode = LOOPBACK_XGMII;
710
efx->loopback_mode = __ffs(efx->loopback_modes);
713
__efx_reconfigure_port(efx);
714
mutex_unlock(&efx->mac_lock);
716
/* free up all consumers of SRAM (including all the queues) */
717
efx_reset_down(efx, reset_method);
719
rc = efx_test_chip(efx, tests);
723
/* reset the chip to recover from the register test */
724
rc_reset = efx->type->reset(efx, reset_method);
726
/* Ensure that the phy is powered and out of loopback
727
* for the bist and loopback tests */
728
efx->phy_mode &= ~PHY_MODE_LOW_POWER;
729
efx->loopback_mode = LOOPBACK_NONE;
731
rc = efx_reset_up(efx, reset_method, rc_reset == 0);
736
netif_err(efx, drv, efx->net_dev,
737
"Unable to recover from chip test\n");
738
efx_schedule_reset(efx, RESET_TYPE_DISABLE);
742
rc = efx_test_phy(efx, tests, flags);
746
rc = efx_test_loopbacks(efx, tests, efx->loopback_modes);
750
/* restore the PHY to the previous state */
751
mutex_lock(&efx->mac_lock);
752
efx->phy_mode = phy_mode;
753
efx->loopback_mode = loopback_mode;
754
__efx_reconfigure_port(efx);
755
mutex_unlock(&efx->mac_lock);
757
netif_device_attach(efx->net_dev);