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ibmvnic.c
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ibmvnic.c
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// SPDX-License-Identifier: GPL-2.0-or-later
/**************************************************************************/
/* */
/* IBM System i and System p Virtual NIC Device Driver */
/* Copyright (C) 2014 IBM Corp. */
/* Santiago Leon (santi_leon@yahoo.com) */
/* Thomas Falcon (tlfalcon@linux.vnet.ibm.com) */
/* John Allen (jallen@linux.vnet.ibm.com) */
/* */
/* */
/* This module contains the implementation of a virtual ethernet device */
/* for use with IBM i/p Series LPAR Linux. It utilizes the logical LAN */
/* option of the RS/6000 Platform Architecture to interface with virtual */
/* ethernet NICs that are presented to the partition by the hypervisor. */
/* */
/* Messages are passed between the VNIC driver and the VNIC server using */
/* Command/Response Queues (CRQs) and sub CRQs (sCRQs). CRQs are used to */
/* issue and receive commands that initiate communication with the server */
/* on driver initialization. Sub CRQs (sCRQs) are similar to CRQs, but */
/* are used by the driver to notify the server that a packet is */
/* ready for transmission or that a buffer has been added to receive a */
/* packet. Subsequently, sCRQs are used by the server to notify the */
/* driver that a packet transmission has been completed or that a packet */
/* has been received and placed in a waiting buffer. */
/* */
/* In lieu of a more conventional "on-the-fly" DMA mapping strategy in */
/* which skbs are DMA mapped and immediately unmapped when the transmit */
/* or receive has been completed, the VNIC driver is required to use */
/* "long term mapping". This entails that large, continuous DMA mapped */
/* buffers are allocated on driver initialization and these buffers are */
/* then continuously reused to pass skbs to and from the VNIC server. */
/* */
/**************************************************************************/
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/types.h>
#include <linux/errno.h>
#include <linux/completion.h>
#include <linux/ioport.h>
#include <linux/dma-mapping.h>
#include <linux/kernel.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/skbuff.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/mm.h>
#include <linux/ethtool.h>
#include <linux/proc_fs.h>
#include <linux/if_arp.h>
#include <linux/in.h>
#include <linux/ip.h>
#include <linux/ipv6.h>
#include <linux/irq.h>
#include <linux/kthread.h>
#include <linux/seq_file.h>
#include <linux/interrupt.h>
#include <net/net_namespace.h>
#include <asm/hvcall.h>
#include <linux/atomic.h>
#include <asm/vio.h>
#include <asm/iommu.h>
#include <linux/uaccess.h>
#include <asm/firmware.h>
#include <linux/workqueue.h>
#include <linux/if_vlan.h>
#include <linux/utsname.h>
#include "ibmvnic.h"
static const char ibmvnic_driver_name[] = "ibmvnic";
static const char ibmvnic_driver_string[] = "IBM System i/p Virtual NIC Driver";
MODULE_AUTHOR("Santiago Leon");
MODULE_DESCRIPTION("IBM System i/p Virtual NIC Driver");
MODULE_LICENSE("GPL");
MODULE_VERSION(IBMVNIC_DRIVER_VERSION);
static int ibmvnic_version = IBMVNIC_INITIAL_VERSION;
static int ibmvnic_remove(struct vio_dev *);
static void release_sub_crqs(struct ibmvnic_adapter *, bool);
static int ibmvnic_reset_crq(struct ibmvnic_adapter *);
static int ibmvnic_send_crq_init(struct ibmvnic_adapter *);
static int ibmvnic_reenable_crq_queue(struct ibmvnic_adapter *);
static int ibmvnic_send_crq(struct ibmvnic_adapter *, union ibmvnic_crq *);
static int send_subcrq(struct ibmvnic_adapter *adapter, u64 remote_handle,
union sub_crq *sub_crq);
static int send_subcrq_indirect(struct ibmvnic_adapter *, u64, u64, u64);
static irqreturn_t ibmvnic_interrupt_rx(int irq, void *instance);
static int enable_scrq_irq(struct ibmvnic_adapter *,
struct ibmvnic_sub_crq_queue *);
static int disable_scrq_irq(struct ibmvnic_adapter *,
struct ibmvnic_sub_crq_queue *);
static int pending_scrq(struct ibmvnic_adapter *,
struct ibmvnic_sub_crq_queue *);
static union sub_crq *ibmvnic_next_scrq(struct ibmvnic_adapter *,
struct ibmvnic_sub_crq_queue *);
static int ibmvnic_poll(struct napi_struct *napi, int data);
static void send_map_query(struct ibmvnic_adapter *adapter);
static int send_request_map(struct ibmvnic_adapter *, dma_addr_t, __be32, u8);
static int send_request_unmap(struct ibmvnic_adapter *, u8);
static int send_login(struct ibmvnic_adapter *adapter);
static void send_cap_queries(struct ibmvnic_adapter *adapter);
static int init_sub_crqs(struct ibmvnic_adapter *);
static int init_sub_crq_irqs(struct ibmvnic_adapter *adapter);
static int ibmvnic_init(struct ibmvnic_adapter *);
static int ibmvnic_reset_init(struct ibmvnic_adapter *);
static void release_crq_queue(struct ibmvnic_adapter *);
static int __ibmvnic_set_mac(struct net_device *, u8 *);
static int init_crq_queue(struct ibmvnic_adapter *adapter);
static int send_query_phys_parms(struct ibmvnic_adapter *adapter);
struct ibmvnic_stat {
char name[ETH_GSTRING_LEN];
int offset;
};
#define IBMVNIC_STAT_OFF(stat) (offsetof(struct ibmvnic_adapter, stats) + \
offsetof(struct ibmvnic_statistics, stat))
#define IBMVNIC_GET_STAT(a, off) (*((u64 *)(((unsigned long)(a)) + off)))
static const struct ibmvnic_stat ibmvnic_stats[] = {
{"rx_packets", IBMVNIC_STAT_OFF(rx_packets)},
{"rx_bytes", IBMVNIC_STAT_OFF(rx_bytes)},
{"tx_packets", IBMVNIC_STAT_OFF(tx_packets)},
{"tx_bytes", IBMVNIC_STAT_OFF(tx_bytes)},
{"ucast_tx_packets", IBMVNIC_STAT_OFF(ucast_tx_packets)},
{"ucast_rx_packets", IBMVNIC_STAT_OFF(ucast_rx_packets)},
{"mcast_tx_packets", IBMVNIC_STAT_OFF(mcast_tx_packets)},
{"mcast_rx_packets", IBMVNIC_STAT_OFF(mcast_rx_packets)},
{"bcast_tx_packets", IBMVNIC_STAT_OFF(bcast_tx_packets)},
{"bcast_rx_packets", IBMVNIC_STAT_OFF(bcast_rx_packets)},
{"align_errors", IBMVNIC_STAT_OFF(align_errors)},
{"fcs_errors", IBMVNIC_STAT_OFF(fcs_errors)},
{"single_collision_frames", IBMVNIC_STAT_OFF(single_collision_frames)},
{"multi_collision_frames", IBMVNIC_STAT_OFF(multi_collision_frames)},
{"sqe_test_errors", IBMVNIC_STAT_OFF(sqe_test_errors)},
{"deferred_tx", IBMVNIC_STAT_OFF(deferred_tx)},
{"late_collisions", IBMVNIC_STAT_OFF(late_collisions)},
{"excess_collisions", IBMVNIC_STAT_OFF(excess_collisions)},
{"internal_mac_tx_errors", IBMVNIC_STAT_OFF(internal_mac_tx_errors)},
{"carrier_sense", IBMVNIC_STAT_OFF(carrier_sense)},
{"too_long_frames", IBMVNIC_STAT_OFF(too_long_frames)},
{"internal_mac_rx_errors", IBMVNIC_STAT_OFF(internal_mac_rx_errors)},
};
static long h_reg_sub_crq(unsigned long unit_address, unsigned long token,
unsigned long length, unsigned long *number,
unsigned long *irq)
{
unsigned long retbuf[PLPAR_HCALL_BUFSIZE];
long rc;
rc = plpar_hcall(H_REG_SUB_CRQ, retbuf, unit_address, token, length);
*number = retbuf[0];
*irq = retbuf[1];
return rc;
}
/**
* ibmvnic_wait_for_completion - Check device state and wait for completion
* @adapter: private device data
* @comp_done: completion structure to wait for
* @timeout: time to wait in milliseconds
*
* Wait for a completion signal or until the timeout limit is reached
* while checking that the device is still active.
*/
static int ibmvnic_wait_for_completion(struct ibmvnic_adapter *adapter,
struct completion *comp_done,
unsigned long timeout)
{
struct net_device *netdev;
unsigned long div_timeout;
u8 retry;
netdev = adapter->netdev;
retry = 5;
div_timeout = msecs_to_jiffies(timeout / retry);
while (true) {
if (!adapter->crq.active) {
netdev_err(netdev, "Device down!\n");
return -ENODEV;
}
if (!retry--)
break;
if (wait_for_completion_timeout(comp_done, div_timeout))
return 0;
}
netdev_err(netdev, "Operation timed out.\n");
return -ETIMEDOUT;
}
static int alloc_long_term_buff(struct ibmvnic_adapter *adapter,
struct ibmvnic_long_term_buff *ltb, int size)
{
struct device *dev = &adapter->vdev->dev;
int rc;
ltb->size = size;
ltb->buff = dma_alloc_coherent(dev, ltb->size, <b->addr,
GFP_KERNEL);
if (!ltb->buff) {
dev_err(dev, "Couldn't alloc long term buffer\n");
return -ENOMEM;
}
ltb->map_id = adapter->map_id;
adapter->map_id++;
mutex_lock(&adapter->fw_lock);
adapter->fw_done_rc = 0;
reinit_completion(&adapter->fw_done);
rc = send_request_map(adapter, ltb->addr,
ltb->size, ltb->map_id);
if (rc) {
dma_free_coherent(dev, ltb->size, ltb->buff, ltb->addr);
mutex_unlock(&adapter->fw_lock);
return rc;
}
rc = ibmvnic_wait_for_completion(adapter, &adapter->fw_done, 10000);
if (rc) {
dev_err(dev,
"Long term map request aborted or timed out,rc = %d\n",
rc);
dma_free_coherent(dev, ltb->size, ltb->buff, ltb->addr);
mutex_unlock(&adapter->fw_lock);
return rc;
}
if (adapter->fw_done_rc) {
dev_err(dev, "Couldn't map long term buffer,rc = %d\n",
adapter->fw_done_rc);
dma_free_coherent(dev, ltb->size, ltb->buff, ltb->addr);
mutex_unlock(&adapter->fw_lock);
return -1;
}
mutex_unlock(&adapter->fw_lock);
return 0;
}
static void free_long_term_buff(struct ibmvnic_adapter *adapter,
struct ibmvnic_long_term_buff *ltb)
{
struct device *dev = &adapter->vdev->dev;
if (!ltb->buff)
return;
if (adapter->reset_reason != VNIC_RESET_FAILOVER &&
adapter->reset_reason != VNIC_RESET_MOBILITY)
send_request_unmap(adapter, ltb->map_id);
dma_free_coherent(dev, ltb->size, ltb->buff, ltb->addr);
}
static int reset_long_term_buff(struct ibmvnic_adapter *adapter,
struct ibmvnic_long_term_buff *ltb)
{
struct device *dev = &adapter->vdev->dev;
int rc;
memset(ltb->buff, 0, ltb->size);
mutex_lock(&adapter->fw_lock);
adapter->fw_done_rc = 0;
reinit_completion(&adapter->fw_done);
rc = send_request_map(adapter, ltb->addr, ltb->size, ltb->map_id);
if (rc) {
mutex_unlock(&adapter->fw_lock);
return rc;
}
rc = ibmvnic_wait_for_completion(adapter, &adapter->fw_done, 10000);
if (rc) {
dev_info(dev,
"Reset failed, long term map request timed out or aborted\n");
mutex_unlock(&adapter->fw_lock);
return rc;
}
if (adapter->fw_done_rc) {
dev_info(dev,
"Reset failed, attempting to free and reallocate buffer\n");
free_long_term_buff(adapter, ltb);
mutex_unlock(&adapter->fw_lock);
return alloc_long_term_buff(adapter, ltb, ltb->size);
}
mutex_unlock(&adapter->fw_lock);
return 0;
}
static void deactivate_rx_pools(struct ibmvnic_adapter *adapter)
{
int i;
for (i = 0; i < be32_to_cpu(adapter->login_rsp_buf->num_rxadd_subcrqs);
i++)
adapter->rx_pool[i].active = 0;
}
static void replenish_rx_pool(struct ibmvnic_adapter *adapter,
struct ibmvnic_rx_pool *pool)
{
int count = pool->size - atomic_read(&pool->available);
struct device *dev = &adapter->vdev->dev;
int buffers_added = 0;
unsigned long lpar_rc;
union sub_crq sub_crq;
struct sk_buff *skb;
unsigned int offset;
dma_addr_t dma_addr;
unsigned char *dst;
u64 *handle_array;
int shift = 0;
int index;
int i;
if (!pool->active)
return;
handle_array = (u64 *)((u8 *)(adapter->login_rsp_buf) +
be32_to_cpu(adapter->login_rsp_buf->
off_rxadd_subcrqs));
for (i = 0; i < count; ++i) {
skb = alloc_skb(pool->buff_size, GFP_ATOMIC);
if (!skb) {
dev_err(dev, "Couldn't replenish rx buff\n");
adapter->replenish_no_mem++;
break;
}
index = pool->free_map[pool->next_free];
if (pool->rx_buff[index].skb)
dev_err(dev, "Inconsistent free_map!\n");
/* Copy the skb to the long term mapped DMA buffer */
offset = index * pool->buff_size;
dst = pool->long_term_buff.buff + offset;
memset(dst, 0, pool->buff_size);
dma_addr = pool->long_term_buff.addr + offset;
pool->rx_buff[index].data = dst;
pool->free_map[pool->next_free] = IBMVNIC_INVALID_MAP;
pool->rx_buff[index].dma = dma_addr;
pool->rx_buff[index].skb = skb;
pool->rx_buff[index].pool_index = pool->index;
pool->rx_buff[index].size = pool->buff_size;
memset(&sub_crq, 0, sizeof(sub_crq));
sub_crq.rx_add.first = IBMVNIC_CRQ_CMD;
sub_crq.rx_add.correlator =
cpu_to_be64((u64)&pool->rx_buff[index]);
sub_crq.rx_add.ioba = cpu_to_be32(dma_addr);
sub_crq.rx_add.map_id = pool->long_term_buff.map_id;
/* The length field of the sCRQ is defined to be 24 bits so the
* buffer size needs to be left shifted by a byte before it is
* converted to big endian to prevent the last byte from being
* truncated.
*/
#ifdef __LITTLE_ENDIAN__
shift = 8;
#endif
sub_crq.rx_add.len = cpu_to_be32(pool->buff_size << shift);
lpar_rc = send_subcrq(adapter, handle_array[pool->index],
&sub_crq);
if (lpar_rc != H_SUCCESS)
goto failure;
buffers_added++;
adapter->replenish_add_buff_success++;
pool->next_free = (pool->next_free + 1) % pool->size;
}
atomic_add(buffers_added, &pool->available);
return;
failure:
if (lpar_rc != H_PARAMETER && lpar_rc != H_CLOSED)
dev_err_ratelimited(dev, "rx: replenish packet buffer failed\n");
pool->free_map[pool->next_free] = index;
pool->rx_buff[index].skb = NULL;
dev_kfree_skb_any(skb);
adapter->replenish_add_buff_failure++;
atomic_add(buffers_added, &pool->available);
if (lpar_rc == H_CLOSED || adapter->failover_pending) {
/* Disable buffer pool replenishment and report carrier off if
* queue is closed or pending failover.
* Firmware guarantees that a signal will be sent to the
* driver, triggering a reset.
*/
deactivate_rx_pools(adapter);
netif_carrier_off(adapter->netdev);
}
}
static void replenish_pools(struct ibmvnic_adapter *adapter)
{
int i;
adapter->replenish_task_cycles++;
for (i = 0; i < be32_to_cpu(adapter->login_rsp_buf->num_rxadd_subcrqs);
i++) {
if (adapter->rx_pool[i].active)
replenish_rx_pool(adapter, &adapter->rx_pool[i]);
}
}
static void release_stats_buffers(struct ibmvnic_adapter *adapter)
{
kfree(adapter->tx_stats_buffers);
kfree(adapter->rx_stats_buffers);
adapter->tx_stats_buffers = NULL;
adapter->rx_stats_buffers = NULL;
}
static int init_stats_buffers(struct ibmvnic_adapter *adapter)
{
adapter->tx_stats_buffers =
kcalloc(IBMVNIC_MAX_QUEUES,
sizeof(struct ibmvnic_tx_queue_stats),
GFP_KERNEL);
if (!adapter->tx_stats_buffers)
return -ENOMEM;
adapter->rx_stats_buffers =
kcalloc(IBMVNIC_MAX_QUEUES,
sizeof(struct ibmvnic_rx_queue_stats),
GFP_KERNEL);
if (!adapter->rx_stats_buffers)
return -ENOMEM;
return 0;
}
static void release_stats_token(struct ibmvnic_adapter *adapter)
{
struct device *dev = &adapter->vdev->dev;
if (!adapter->stats_token)
return;
dma_unmap_single(dev, adapter->stats_token,
sizeof(struct ibmvnic_statistics),
DMA_FROM_DEVICE);
adapter->stats_token = 0;
}
static int init_stats_token(struct ibmvnic_adapter *adapter)
{
struct device *dev = &adapter->vdev->dev;
dma_addr_t stok;
stok = dma_map_single(dev, &adapter->stats,
sizeof(struct ibmvnic_statistics),
DMA_FROM_DEVICE);
if (dma_mapping_error(dev, stok)) {
dev_err(dev, "Couldn't map stats buffer\n");
return -1;
}
adapter->stats_token = stok;
netdev_dbg(adapter->netdev, "Stats token initialized (%llx)\n", stok);
return 0;
}
static int reset_rx_pools(struct ibmvnic_adapter *adapter)
{
struct ibmvnic_rx_pool *rx_pool;
int rx_scrqs;
int i, j, rc;
u64 *size_array;
if (!adapter->rx_pool)
return -1;
size_array = (u64 *)((u8 *)(adapter->login_rsp_buf) +
be32_to_cpu(adapter->login_rsp_buf->off_rxadd_buff_size));
rx_scrqs = be32_to_cpu(adapter->login_rsp_buf->num_rxadd_subcrqs);
for (i = 0; i < rx_scrqs; i++) {
rx_pool = &adapter->rx_pool[i];
netdev_dbg(adapter->netdev, "Re-setting rx_pool[%d]\n", i);
if (rx_pool->buff_size != be64_to_cpu(size_array[i])) {
free_long_term_buff(adapter, &rx_pool->long_term_buff);
rx_pool->buff_size = be64_to_cpu(size_array[i]);
rc = alloc_long_term_buff(adapter,
&rx_pool->long_term_buff,
rx_pool->size *
rx_pool->buff_size);
} else {
rc = reset_long_term_buff(adapter,
&rx_pool->long_term_buff);
}
if (rc)
return rc;
for (j = 0; j < rx_pool->size; j++)
rx_pool->free_map[j] = j;
memset(rx_pool->rx_buff, 0,
rx_pool->size * sizeof(struct ibmvnic_rx_buff));
atomic_set(&rx_pool->available, 0);
rx_pool->next_alloc = 0;
rx_pool->next_free = 0;
rx_pool->active = 1;
}
return 0;
}
static void release_rx_pools(struct ibmvnic_adapter *adapter)
{
struct ibmvnic_rx_pool *rx_pool;
int i, j;
if (!adapter->rx_pool)
return;
for (i = 0; i < adapter->num_active_rx_pools; i++) {
rx_pool = &adapter->rx_pool[i];
netdev_dbg(adapter->netdev, "Releasing rx_pool[%d]\n", i);
kfree(rx_pool->free_map);
free_long_term_buff(adapter, &rx_pool->long_term_buff);
if (!rx_pool->rx_buff)
continue;
for (j = 0; j < rx_pool->size; j++) {
if (rx_pool->rx_buff[j].skb) {
dev_kfree_skb_any(rx_pool->rx_buff[j].skb);
rx_pool->rx_buff[j].skb = NULL;
}
}
kfree(rx_pool->rx_buff);
}
kfree(adapter->rx_pool);
adapter->rx_pool = NULL;
adapter->num_active_rx_pools = 0;
}
static int init_rx_pools(struct net_device *netdev)
{
struct ibmvnic_adapter *adapter = netdev_priv(netdev);
struct device *dev = &adapter->vdev->dev;
struct ibmvnic_rx_pool *rx_pool;
int rxadd_subcrqs;
u64 *size_array;
int i, j;
rxadd_subcrqs =
be32_to_cpu(adapter->login_rsp_buf->num_rxadd_subcrqs);
size_array = (u64 *)((u8 *)(adapter->login_rsp_buf) +
be32_to_cpu(adapter->login_rsp_buf->off_rxadd_buff_size));
adapter->rx_pool = kcalloc(rxadd_subcrqs,
sizeof(struct ibmvnic_rx_pool),
GFP_KERNEL);
if (!adapter->rx_pool) {
dev_err(dev, "Failed to allocate rx pools\n");
return -1;
}
adapter->num_active_rx_pools = rxadd_subcrqs;
for (i = 0; i < rxadd_subcrqs; i++) {
rx_pool = &adapter->rx_pool[i];
netdev_dbg(adapter->netdev,
"Initializing rx_pool[%d], %lld buffs, %lld bytes each\n",
i, adapter->req_rx_add_entries_per_subcrq,
be64_to_cpu(size_array[i]));
rx_pool->size = adapter->req_rx_add_entries_per_subcrq;
rx_pool->index = i;
rx_pool->buff_size = be64_to_cpu(size_array[i]);
rx_pool->active = 1;
rx_pool->free_map = kcalloc(rx_pool->size, sizeof(int),
GFP_KERNEL);
if (!rx_pool->free_map) {
release_rx_pools(adapter);
return -1;
}
rx_pool->rx_buff = kcalloc(rx_pool->size,
sizeof(struct ibmvnic_rx_buff),
GFP_KERNEL);
if (!rx_pool->rx_buff) {
dev_err(dev, "Couldn't alloc rx buffers\n");
release_rx_pools(adapter);
return -1;
}
if (alloc_long_term_buff(adapter, &rx_pool->long_term_buff,
rx_pool->size * rx_pool->buff_size)) {
release_rx_pools(adapter);
return -1;
}
for (j = 0; j < rx_pool->size; ++j)
rx_pool->free_map[j] = j;
atomic_set(&rx_pool->available, 0);
rx_pool->next_alloc = 0;
rx_pool->next_free = 0;
}
return 0;
}
static int reset_one_tx_pool(struct ibmvnic_adapter *adapter,
struct ibmvnic_tx_pool *tx_pool)
{
int rc, i;
rc = reset_long_term_buff(adapter, &tx_pool->long_term_buff);
if (rc)
return rc;
memset(tx_pool->tx_buff, 0,
tx_pool->num_buffers *
sizeof(struct ibmvnic_tx_buff));
for (i = 0; i < tx_pool->num_buffers; i++)
tx_pool->free_map[i] = i;
tx_pool->consumer_index = 0;
tx_pool->producer_index = 0;
return 0;
}
static int reset_tx_pools(struct ibmvnic_adapter *adapter)
{
int tx_scrqs;
int i, rc;
if (!adapter->tx_pool)
return -1;
tx_scrqs = be32_to_cpu(adapter->login_rsp_buf->num_txsubm_subcrqs);
for (i = 0; i < tx_scrqs; i++) {
rc = reset_one_tx_pool(adapter, &adapter->tso_pool[i]);
if (rc)
return rc;
rc = reset_one_tx_pool(adapter, &adapter->tx_pool[i]);
if (rc)
return rc;
}
return 0;
}
static void release_vpd_data(struct ibmvnic_adapter *adapter)
{
if (!adapter->vpd)
return;
kfree(adapter->vpd->buff);
kfree(adapter->vpd);
adapter->vpd = NULL;
}
static void release_one_tx_pool(struct ibmvnic_adapter *adapter,
struct ibmvnic_tx_pool *tx_pool)
{
kfree(tx_pool->tx_buff);
kfree(tx_pool->free_map);
free_long_term_buff(adapter, &tx_pool->long_term_buff);
}
static void release_tx_pools(struct ibmvnic_adapter *adapter)
{
int i;
if (!adapter->tx_pool)
return;
for (i = 0; i < adapter->num_active_tx_pools; i++) {
release_one_tx_pool(adapter, &adapter->tx_pool[i]);
release_one_tx_pool(adapter, &adapter->tso_pool[i]);
}
kfree(adapter->tx_pool);
adapter->tx_pool = NULL;
kfree(adapter->tso_pool);
adapter->tso_pool = NULL;
adapter->num_active_tx_pools = 0;
}
static int init_one_tx_pool(struct net_device *netdev,
struct ibmvnic_tx_pool *tx_pool,
int num_entries, int buf_size)
{
struct ibmvnic_adapter *adapter = netdev_priv(netdev);
int i;
tx_pool->tx_buff = kcalloc(num_entries,
sizeof(struct ibmvnic_tx_buff),
GFP_KERNEL);
if (!tx_pool->tx_buff)
return -1;
if (alloc_long_term_buff(adapter, &tx_pool->long_term_buff,
num_entries * buf_size))
return -1;
tx_pool->free_map = kcalloc(num_entries, sizeof(int), GFP_KERNEL);
if (!tx_pool->free_map)
return -1;
for (i = 0; i < num_entries; i++)
tx_pool->free_map[i] = i;
tx_pool->consumer_index = 0;
tx_pool->producer_index = 0;
tx_pool->num_buffers = num_entries;
tx_pool->buf_size = buf_size;
return 0;
}
static int init_tx_pools(struct net_device *netdev)
{
struct ibmvnic_adapter *adapter = netdev_priv(netdev);
int tx_subcrqs;
int i, rc;
tx_subcrqs = be32_to_cpu(adapter->login_rsp_buf->num_txsubm_subcrqs);
adapter->tx_pool = kcalloc(tx_subcrqs,
sizeof(struct ibmvnic_tx_pool), GFP_KERNEL);
if (!adapter->tx_pool)
return -1;
adapter->tso_pool = kcalloc(tx_subcrqs,
sizeof(struct ibmvnic_tx_pool), GFP_KERNEL);
if (!adapter->tso_pool)
return -1;
adapter->num_active_tx_pools = tx_subcrqs;
for (i = 0; i < tx_subcrqs; i++) {
rc = init_one_tx_pool(netdev, &adapter->tx_pool[i],
adapter->req_tx_entries_per_subcrq,
adapter->req_mtu + VLAN_HLEN);
if (rc) {
release_tx_pools(adapter);
return rc;
}
rc = init_one_tx_pool(netdev, &adapter->tso_pool[i],
IBMVNIC_TSO_BUFS,
IBMVNIC_TSO_BUF_SZ);
if (rc) {
release_tx_pools(adapter);
return rc;
}
}
return 0;
}
static void ibmvnic_napi_enable(struct ibmvnic_adapter *adapter)
{
int i;
if (adapter->napi_enabled)
return;
for (i = 0; i < adapter->req_rx_queues; i++)
napi_enable(&adapter->napi[i]);
adapter->napi_enabled = true;
}
static void ibmvnic_napi_disable(struct ibmvnic_adapter *adapter)
{
int i;
if (!adapter->napi_enabled)
return;
for (i = 0; i < adapter->req_rx_queues; i++) {
netdev_dbg(adapter->netdev, "Disabling napi[%d]\n", i);
napi_disable(&adapter->napi[i]);
}
adapter->napi_enabled = false;
}
static int init_napi(struct ibmvnic_adapter *adapter)
{
int i;
adapter->napi = kcalloc(adapter->req_rx_queues,
sizeof(struct napi_struct), GFP_KERNEL);
if (!adapter->napi)
return -ENOMEM;
for (i = 0; i < adapter->req_rx_queues; i++) {
netdev_dbg(adapter->netdev, "Adding napi[%d]\n", i);
netif_napi_add(adapter->netdev, &adapter->napi[i],
ibmvnic_poll, NAPI_POLL_WEIGHT);
}
adapter->num_active_rx_napi = adapter->req_rx_queues;
return 0;
}
static void release_napi(struct ibmvnic_adapter *adapter)
{
int i;
if (!adapter->napi)
return;
for (i = 0; i < adapter->num_active_rx_napi; i++) {
netdev_dbg(adapter->netdev, "Releasing napi[%d]\n", i);
netif_napi_del(&adapter->napi[i]);
}
kfree(adapter->napi);
adapter->napi = NULL;
adapter->num_active_rx_napi = 0;
adapter->napi_enabled = false;
}
static int ibmvnic_login(struct net_device *netdev)
{
struct ibmvnic_adapter *adapter = netdev_priv(netdev);
unsigned long timeout = msecs_to_jiffies(30000);
int retry_count = 0;
int retries = 10;
bool retry;
int rc;
do {
retry = false;
if (retry_count > retries) {
netdev_warn(netdev, "Login attempts exceeded\n");
return -1;
}
adapter->init_done_rc = 0;
reinit_completion(&adapter->init_done);
rc = send_login(adapter);
if (rc) {
netdev_warn(netdev, "Unable to login\n");
return rc;
}
if (!wait_for_completion_timeout(&adapter->init_done,
timeout)) {
netdev_warn(netdev, "Login timed out, retrying...\n");
retry = true;
adapter->init_done_rc = 0;
retry_count++;
continue;
}
if (adapter->init_done_rc == ABORTED) {
netdev_warn(netdev, "Login aborted, retrying...\n");
retry = true;
adapter->init_done_rc = 0;
retry_count++;
/* FW or device may be busy, so
* wait a bit before retrying login
*/
msleep(500);
} else if (adapter->init_done_rc == PARTIALSUCCESS) {
retry_count++;
release_sub_crqs(adapter, 1);
retry = true;
netdev_dbg(netdev,
"Received partial success, retrying...\n");
adapter->init_done_rc = 0;
reinit_completion(&adapter->init_done);
send_cap_queries(adapter);
if (!wait_for_completion_timeout(&adapter->init_done,
timeout)) {
netdev_warn(netdev,
"Capabilities query timed out\n");
return -1;
}
rc = init_sub_crqs(adapter);
if (rc) {
netdev_warn(netdev,
"SCRQ initialization failed\n");
return -1;
}
rc = init_sub_crq_irqs(adapter);
if (rc) {
netdev_warn(netdev,
"SCRQ irq initialization failed\n");
return -1;
}
} else if (adapter->init_done_rc) {
netdev_warn(netdev, "Adapter login failed\n");
return -1;
}
} while (retry);
__ibmvnic_set_mac(netdev, adapter->mac_addr);
return 0;
}
static void release_login_buffer(struct ibmvnic_adapter *adapter)
{
kfree(adapter->login_buf);
adapter->login_buf = NULL;
}
static void release_login_rsp_buffer(struct ibmvnic_adapter *adapter)
{
kfree(adapter->login_rsp_buf);
adapter->login_rsp_buf = NULL;
}
static void release_resources(struct ibmvnic_adapter *adapter)
{
release_vpd_data(adapter);
release_tx_pools(adapter);
release_rx_pools(adapter);
release_napi(adapter);
release_login_rsp_buffer(adapter);
}
static int set_link_state(struct ibmvnic_adapter *adapter, u8 link_state)
{
struct net_device *netdev = adapter->netdev;
unsigned long timeout = msecs_to_jiffies(30000);
union ibmvnic_crq crq;
bool resend;
int rc;
netdev_dbg(netdev, "setting link state %d\n", link_state);
memset(&crq, 0, sizeof(crq));
crq.logical_link_state.first = IBMVNIC_CRQ_CMD;
crq.logical_link_state.cmd = LOGICAL_LINK_STATE;
crq.logical_link_state.link_state = link_state;
do {
resend = false;
reinit_completion(&adapter->init_done);
rc = ibmvnic_send_crq(adapter, &crq);
if (rc) {
netdev_err(netdev, "Failed to set link state\n");
return rc;
}
if (!wait_for_completion_timeout(&adapter->init_done,
timeout)) {
netdev_err(netdev, "timeout setting link state\n");
return -1;
}
if (adapter->init_done_rc == 1) {
/* Partuial success, delay and re-send */
mdelay(1000);
resend = true;
} else if (adapter->init_done_rc) {
netdev_warn(netdev, "Unable to set link state, rc=%d\n",
adapter->init_done_rc);
return adapter->init_done_rc;
}
} while (resend);
return 0;
}
static int set_real_num_queues(struct net_device *netdev)
{
struct ibmvnic_adapter *adapter = netdev_priv(netdev);
int rc;