linux/drivers/net/ethernet/sun/sunvnet.c
Sowmini Varadhan 1d311ad2f9 sunvnet: Schedule maybe_tx_wakeup() as a tasklet from ldc_rx path
At the tail of vnet_event(), if we hit the maybe_tx_wakeup()
condition, we try to take the netif_tx_lock() in the
recv-interrupt-context and can deadlock with dev_watchdog().
vnet_event() should schedule maybe_tx_wakeup() as a tasklet
to avoid this deadlock

Signed-off-by: Sowmini Varadhan <sowmini.varadhan@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2014-08-13 20:04:46 -07:00

1337 lines
30 KiB
C

/* sunvnet.c: Sun LDOM Virtual Network Driver.
*
* Copyright (C) 2007, 2008 David S. Miller <davem@davemloft.net>
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/slab.h>
#include <linux/delay.h>
#include <linux/init.h>
#include <linux/netdevice.h>
#include <linux/ethtool.h>
#include <linux/etherdevice.h>
#include <linux/mutex.h>
#include <asm/vio.h>
#include <asm/ldc.h>
#include "sunvnet.h"
#define DRV_MODULE_NAME "sunvnet"
#define DRV_MODULE_VERSION "1.0"
#define DRV_MODULE_RELDATE "June 25, 2007"
static char version[] =
DRV_MODULE_NAME ".c:v" DRV_MODULE_VERSION " (" DRV_MODULE_RELDATE ")\n";
MODULE_AUTHOR("David S. Miller (davem@davemloft.net)");
MODULE_DESCRIPTION("Sun LDOM virtual network driver");
MODULE_LICENSE("GPL");
MODULE_VERSION(DRV_MODULE_VERSION);
/* Heuristic for the number of times to exponentially backoff and
* retry sending an LDC trigger when EAGAIN is encountered
*/
#define VNET_MAX_RETRIES 10
/* Ordered from largest major to lowest */
static struct vio_version vnet_versions[] = {
{ .major = 1, .minor = 0 },
};
static inline u32 vnet_tx_dring_avail(struct vio_dring_state *dr)
{
return vio_dring_avail(dr, VNET_TX_RING_SIZE);
}
static int vnet_handle_unknown(struct vnet_port *port, void *arg)
{
struct vio_msg_tag *pkt = arg;
pr_err("Received unknown msg [%02x:%02x:%04x:%08x]\n",
pkt->type, pkt->stype, pkt->stype_env, pkt->sid);
pr_err("Resetting connection\n");
ldc_disconnect(port->vio.lp);
return -ECONNRESET;
}
static int vnet_send_attr(struct vio_driver_state *vio)
{
struct vnet_port *port = to_vnet_port(vio);
struct net_device *dev = port->vp->dev;
struct vio_net_attr_info pkt;
int i;
memset(&pkt, 0, sizeof(pkt));
pkt.tag.type = VIO_TYPE_CTRL;
pkt.tag.stype = VIO_SUBTYPE_INFO;
pkt.tag.stype_env = VIO_ATTR_INFO;
pkt.tag.sid = vio_send_sid(vio);
pkt.xfer_mode = VIO_DRING_MODE;
pkt.addr_type = VNET_ADDR_ETHERMAC;
pkt.ack_freq = 0;
for (i = 0; i < 6; i++)
pkt.addr |= (u64)dev->dev_addr[i] << ((5 - i) * 8);
pkt.mtu = ETH_FRAME_LEN;
viodbg(HS, "SEND NET ATTR xmode[0x%x] atype[0x%x] addr[%llx] "
"ackfreq[%u] mtu[%llu]\n",
pkt.xfer_mode, pkt.addr_type,
(unsigned long long) pkt.addr,
pkt.ack_freq,
(unsigned long long) pkt.mtu);
return vio_ldc_send(vio, &pkt, sizeof(pkt));
}
static int handle_attr_info(struct vio_driver_state *vio,
struct vio_net_attr_info *pkt)
{
viodbg(HS, "GOT NET ATTR INFO xmode[0x%x] atype[0x%x] addr[%llx] "
"ackfreq[%u] mtu[%llu]\n",
pkt->xfer_mode, pkt->addr_type,
(unsigned long long) pkt->addr,
pkt->ack_freq,
(unsigned long long) pkt->mtu);
pkt->tag.sid = vio_send_sid(vio);
if (pkt->xfer_mode != VIO_DRING_MODE ||
pkt->addr_type != VNET_ADDR_ETHERMAC ||
pkt->mtu != ETH_FRAME_LEN) {
viodbg(HS, "SEND NET ATTR NACK\n");
pkt->tag.stype = VIO_SUBTYPE_NACK;
(void) vio_ldc_send(vio, pkt, sizeof(*pkt));
return -ECONNRESET;
} else {
viodbg(HS, "SEND NET ATTR ACK\n");
pkt->tag.stype = VIO_SUBTYPE_ACK;
return vio_ldc_send(vio, pkt, sizeof(*pkt));
}
}
static int handle_attr_ack(struct vio_driver_state *vio,
struct vio_net_attr_info *pkt)
{
viodbg(HS, "GOT NET ATTR ACK\n");
return 0;
}
static int handle_attr_nack(struct vio_driver_state *vio,
struct vio_net_attr_info *pkt)
{
viodbg(HS, "GOT NET ATTR NACK\n");
return -ECONNRESET;
}
static int vnet_handle_attr(struct vio_driver_state *vio, void *arg)
{
struct vio_net_attr_info *pkt = arg;
switch (pkt->tag.stype) {
case VIO_SUBTYPE_INFO:
return handle_attr_info(vio, pkt);
case VIO_SUBTYPE_ACK:
return handle_attr_ack(vio, pkt);
case VIO_SUBTYPE_NACK:
return handle_attr_nack(vio, pkt);
default:
return -ECONNRESET;
}
}
static void vnet_handshake_complete(struct vio_driver_state *vio)
{
struct vio_dring_state *dr;
dr = &vio->drings[VIO_DRIVER_RX_RING];
dr->snd_nxt = dr->rcv_nxt = 1;
dr = &vio->drings[VIO_DRIVER_TX_RING];
dr->snd_nxt = dr->rcv_nxt = 1;
}
/* The hypervisor interface that implements copying to/from imported
* memory from another domain requires that copies are done to 8-byte
* aligned buffers, and that the lengths of such copies are also 8-byte
* multiples.
*
* So we align skb->data to an 8-byte multiple and pad-out the data
* area so we can round the copy length up to the next multiple of
* 8 for the copy.
*
* The transmitter puts the actual start of the packet 6 bytes into
* the buffer it sends over, so that the IP headers after the ethernet
* header are aligned properly. These 6 bytes are not in the descriptor
* length, they are simply implied. This offset is represented using
* the VNET_PACKET_SKIP macro.
*/
static struct sk_buff *alloc_and_align_skb(struct net_device *dev,
unsigned int len)
{
struct sk_buff *skb = netdev_alloc_skb(dev, len+VNET_PACKET_SKIP+8+8);
unsigned long addr, off;
if (unlikely(!skb))
return NULL;
addr = (unsigned long) skb->data;
off = ((addr + 7UL) & ~7UL) - addr;
if (off)
skb_reserve(skb, off);
return skb;
}
static int vnet_rx_one(struct vnet_port *port, unsigned int len,
struct ldc_trans_cookie *cookies, int ncookies)
{
struct net_device *dev = port->vp->dev;
unsigned int copy_len;
struct sk_buff *skb;
int err;
err = -EMSGSIZE;
if (unlikely(len < ETH_ZLEN || len > ETH_FRAME_LEN)) {
dev->stats.rx_length_errors++;
goto out_dropped;
}
skb = alloc_and_align_skb(dev, len);
err = -ENOMEM;
if (unlikely(!skb)) {
dev->stats.rx_missed_errors++;
goto out_dropped;
}
copy_len = (len + VNET_PACKET_SKIP + 7U) & ~7U;
skb_put(skb, copy_len);
err = ldc_copy(port->vio.lp, LDC_COPY_IN,
skb->data, copy_len, 0,
cookies, ncookies);
if (unlikely(err < 0)) {
dev->stats.rx_frame_errors++;
goto out_free_skb;
}
skb_pull(skb, VNET_PACKET_SKIP);
skb_trim(skb, len);
skb->protocol = eth_type_trans(skb, dev);
dev->stats.rx_packets++;
dev->stats.rx_bytes += len;
netif_rx(skb);
return 0;
out_free_skb:
kfree_skb(skb);
out_dropped:
dev->stats.rx_dropped++;
return err;
}
static int vnet_send_ack(struct vnet_port *port, struct vio_dring_state *dr,
u32 start, u32 end, u8 vio_dring_state)
{
struct vio_dring_data hdr = {
.tag = {
.type = VIO_TYPE_DATA,
.stype = VIO_SUBTYPE_ACK,
.stype_env = VIO_DRING_DATA,
.sid = vio_send_sid(&port->vio),
},
.dring_ident = dr->ident,
.start_idx = start,
.end_idx = end,
.state = vio_dring_state,
};
int err, delay;
int retries = 0;
hdr.seq = dr->snd_nxt;
delay = 1;
do {
err = vio_ldc_send(&port->vio, &hdr, sizeof(hdr));
if (err > 0) {
dr->snd_nxt++;
break;
}
udelay(delay);
if ((delay <<= 1) > 128)
delay = 128;
if (retries++ > VNET_MAX_RETRIES) {
pr_info("ECONNRESET %x:%x:%x:%x:%x:%x\n",
port->raddr[0], port->raddr[1],
port->raddr[2], port->raddr[3],
port->raddr[4], port->raddr[5]);
err = -ECONNRESET;
}
} while (err == -EAGAIN);
return err;
}
static u32 next_idx(u32 idx, struct vio_dring_state *dr)
{
if (++idx == dr->num_entries)
idx = 0;
return idx;
}
static u32 prev_idx(u32 idx, struct vio_dring_state *dr)
{
if (idx == 0)
idx = dr->num_entries - 1;
else
idx--;
return idx;
}
static struct vio_net_desc *get_rx_desc(struct vnet_port *port,
struct vio_dring_state *dr,
u32 index)
{
struct vio_net_desc *desc = port->vio.desc_buf;
int err;
err = ldc_get_dring_entry(port->vio.lp, desc, dr->entry_size,
(index * dr->entry_size),
dr->cookies, dr->ncookies);
if (err < 0)
return ERR_PTR(err);
return desc;
}
static int put_rx_desc(struct vnet_port *port,
struct vio_dring_state *dr,
struct vio_net_desc *desc,
u32 index)
{
int err;
err = ldc_put_dring_entry(port->vio.lp, desc, dr->entry_size,
(index * dr->entry_size),
dr->cookies, dr->ncookies);
if (err < 0)
return err;
return 0;
}
static int vnet_walk_rx_one(struct vnet_port *port,
struct vio_dring_state *dr,
u32 index, int *needs_ack)
{
struct vio_net_desc *desc = get_rx_desc(port, dr, index);
struct vio_driver_state *vio = &port->vio;
int err;
if (IS_ERR(desc))
return PTR_ERR(desc);
viodbg(DATA, "vio_walk_rx_one desc[%02x:%02x:%08x:%08x:%llx:%llx]\n",
desc->hdr.state, desc->hdr.ack,
desc->size, desc->ncookies,
desc->cookies[0].cookie_addr,
desc->cookies[0].cookie_size);
if (desc->hdr.state != VIO_DESC_READY)
return 1;
err = vnet_rx_one(port, desc->size, desc->cookies, desc->ncookies);
if (err == -ECONNRESET)
return err;
desc->hdr.state = VIO_DESC_DONE;
err = put_rx_desc(port, dr, desc, index);
if (err < 0)
return err;
*needs_ack = desc->hdr.ack;
return 0;
}
static int vnet_walk_rx(struct vnet_port *port, struct vio_dring_state *dr,
u32 start, u32 end)
{
struct vio_driver_state *vio = &port->vio;
int ack_start = -1, ack_end = -1;
end = (end == (u32) -1) ? prev_idx(start, dr) : next_idx(end, dr);
viodbg(DATA, "vnet_walk_rx start[%08x] end[%08x]\n", start, end);
while (start != end) {
int ack = 0, err = vnet_walk_rx_one(port, dr, start, &ack);
if (err == -ECONNRESET)
return err;
if (err != 0)
break;
if (ack_start == -1)
ack_start = start;
ack_end = start;
start = next_idx(start, dr);
if (ack && start != end) {
err = vnet_send_ack(port, dr, ack_start, ack_end,
VIO_DRING_ACTIVE);
if (err == -ECONNRESET)
return err;
ack_start = -1;
}
}
if (unlikely(ack_start == -1))
ack_start = ack_end = prev_idx(start, dr);
return vnet_send_ack(port, dr, ack_start, ack_end, VIO_DRING_STOPPED);
}
static int vnet_rx(struct vnet_port *port, void *msgbuf)
{
struct vio_dring_data *pkt = msgbuf;
struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_RX_RING];
struct vio_driver_state *vio = &port->vio;
viodbg(DATA, "vnet_rx stype_env[%04x] seq[%016llx] rcv_nxt[%016llx]\n",
pkt->tag.stype_env, pkt->seq, dr->rcv_nxt);
if (unlikely(pkt->tag.stype_env != VIO_DRING_DATA))
return 0;
if (unlikely(pkt->seq != dr->rcv_nxt)) {
pr_err("RX out of sequence seq[0x%llx] rcv_nxt[0x%llx]\n",
pkt->seq, dr->rcv_nxt);
return 0;
}
dr->rcv_nxt++;
/* XXX Validate pkt->start_idx and pkt->end_idx XXX */
return vnet_walk_rx(port, dr, pkt->start_idx, pkt->end_idx);
}
static int idx_is_pending(struct vio_dring_state *dr, u32 end)
{
u32 idx = dr->cons;
int found = 0;
while (idx != dr->prod) {
if (idx == end) {
found = 1;
break;
}
idx = next_idx(idx, dr);
}
return found;
}
static int vnet_ack(struct vnet_port *port, void *msgbuf)
{
struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING];
struct vio_dring_data *pkt = msgbuf;
struct net_device *dev;
struct vnet *vp;
u32 end;
if (unlikely(pkt->tag.stype_env != VIO_DRING_DATA))
return 0;
end = pkt->end_idx;
if (unlikely(!idx_is_pending(dr, end)))
return 0;
dr->cons = next_idx(end, dr);
vp = port->vp;
dev = vp->dev;
if (unlikely(netif_queue_stopped(dev) &&
vnet_tx_dring_avail(dr) >= VNET_TX_WAKEUP_THRESH(dr)))
return 1;
return 0;
}
static int vnet_nack(struct vnet_port *port, void *msgbuf)
{
/* XXX just reset or similar XXX */
return 0;
}
static int handle_mcast(struct vnet_port *port, void *msgbuf)
{
struct vio_net_mcast_info *pkt = msgbuf;
if (pkt->tag.stype != VIO_SUBTYPE_ACK)
pr_err("%s: Got unexpected MCAST reply [%02x:%02x:%04x:%08x]\n",
port->vp->dev->name,
pkt->tag.type,
pkt->tag.stype,
pkt->tag.stype_env,
pkt->tag.sid);
return 0;
}
static void maybe_tx_wakeup(unsigned long param)
{
struct vnet *vp = (struct vnet *)param;
struct net_device *dev = vp->dev;
netif_tx_lock(dev);
if (likely(netif_queue_stopped(dev))) {
struct vnet_port *port;
int wake = 1;
list_for_each_entry(port, &vp->port_list, list) {
struct vio_dring_state *dr;
dr = &port->vio.drings[VIO_DRIVER_TX_RING];
if (vnet_tx_dring_avail(dr) <
VNET_TX_WAKEUP_THRESH(dr)) {
wake = 0;
break;
}
}
if (wake)
netif_wake_queue(dev);
}
netif_tx_unlock(dev);
}
static void vnet_event(void *arg, int event)
{
struct vnet_port *port = arg;
struct vio_driver_state *vio = &port->vio;
unsigned long flags;
int tx_wakeup, err;
spin_lock_irqsave(&vio->lock, flags);
if (unlikely(event == LDC_EVENT_RESET ||
event == LDC_EVENT_UP)) {
vio_link_state_change(vio, event);
spin_unlock_irqrestore(&vio->lock, flags);
if (event == LDC_EVENT_RESET)
vio_port_up(vio);
return;
}
if (unlikely(event != LDC_EVENT_DATA_READY)) {
pr_warning("Unexpected LDC event %d\n", event);
spin_unlock_irqrestore(&vio->lock, flags);
return;
}
tx_wakeup = err = 0;
while (1) {
union {
struct vio_msg_tag tag;
u64 raw[8];
} msgbuf;
err = ldc_read(vio->lp, &msgbuf, sizeof(msgbuf));
if (unlikely(err < 0)) {
if (err == -ECONNRESET)
vio_conn_reset(vio);
break;
}
if (err == 0)
break;
viodbg(DATA, "TAG [%02x:%02x:%04x:%08x]\n",
msgbuf.tag.type,
msgbuf.tag.stype,
msgbuf.tag.stype_env,
msgbuf.tag.sid);
err = vio_validate_sid(vio, &msgbuf.tag);
if (err < 0)
break;
if (likely(msgbuf.tag.type == VIO_TYPE_DATA)) {
if (msgbuf.tag.stype == VIO_SUBTYPE_INFO) {
err = vnet_rx(port, &msgbuf);
} else if (msgbuf.tag.stype == VIO_SUBTYPE_ACK) {
err = vnet_ack(port, &msgbuf);
if (err > 0)
tx_wakeup |= err;
} else if (msgbuf.tag.stype == VIO_SUBTYPE_NACK) {
err = vnet_nack(port, &msgbuf);
}
} else if (msgbuf.tag.type == VIO_TYPE_CTRL) {
if (msgbuf.tag.stype_env == VNET_MCAST_INFO)
err = handle_mcast(port, &msgbuf);
else
err = vio_control_pkt_engine(vio, &msgbuf);
if (err)
break;
} else {
err = vnet_handle_unknown(port, &msgbuf);
}
if (err == -ECONNRESET)
break;
}
spin_unlock(&vio->lock);
/* Kick off a tasklet to wake the queue. We cannot call
* maybe_tx_wakeup directly here because we could deadlock on
* netif_tx_lock() with dev_watchdog()
*/
if (unlikely(tx_wakeup && err != -ECONNRESET))
tasklet_schedule(&port->vp->vnet_tx_wakeup);
local_irq_restore(flags);
}
static int __vnet_tx_trigger(struct vnet_port *port)
{
struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING];
struct vio_dring_data hdr = {
.tag = {
.type = VIO_TYPE_DATA,
.stype = VIO_SUBTYPE_INFO,
.stype_env = VIO_DRING_DATA,
.sid = vio_send_sid(&port->vio),
},
.dring_ident = dr->ident,
.start_idx = dr->prod,
.end_idx = (u32) -1,
};
int err, delay;
int retries = 0;
hdr.seq = dr->snd_nxt;
delay = 1;
do {
err = vio_ldc_send(&port->vio, &hdr, sizeof(hdr));
if (err > 0) {
dr->snd_nxt++;
break;
}
udelay(delay);
if ((delay <<= 1) > 128)
delay = 128;
if (retries++ > VNET_MAX_RETRIES)
break;
} while (err == -EAGAIN);
return err;
}
static inline bool port_is_up(struct vnet_port *vnet)
{
struct vio_driver_state *vio = &vnet->vio;
return !!(vio->hs_state & VIO_HS_COMPLETE);
}
struct vnet_port *__tx_port_find(struct vnet *vp, struct sk_buff *skb)
{
unsigned int hash = vnet_hashfn(skb->data);
struct hlist_head *hp = &vp->port_hash[hash];
struct vnet_port *port;
hlist_for_each_entry(port, hp, hash) {
if (!port_is_up(port))
continue;
if (ether_addr_equal(port->raddr, skb->data))
return port;
}
list_for_each_entry(port, &vp->port_list, list) {
if (!port->switch_port)
continue;
if (!port_is_up(port))
continue;
return port;
}
return NULL;
}
struct vnet_port *tx_port_find(struct vnet *vp, struct sk_buff *skb)
{
struct vnet_port *ret;
unsigned long flags;
spin_lock_irqsave(&vp->lock, flags);
ret = __tx_port_find(vp, skb);
spin_unlock_irqrestore(&vp->lock, flags);
return ret;
}
static int vnet_start_xmit(struct sk_buff *skb, struct net_device *dev)
{
struct vnet *vp = netdev_priv(dev);
struct vnet_port *port = tx_port_find(vp, skb);
struct vio_dring_state *dr;
struct vio_net_desc *d;
unsigned long flags;
unsigned int len;
void *tx_buf;
int i, err;
if (unlikely(!port))
goto out_dropped;
spin_lock_irqsave(&port->vio.lock, flags);
dr = &port->vio.drings[VIO_DRIVER_TX_RING];
if (unlikely(vnet_tx_dring_avail(dr) < 2)) {
if (!netif_queue_stopped(dev)) {
netif_stop_queue(dev);
/* This is a hard error, log it. */
netdev_err(dev, "BUG! Tx Ring full when queue awake!\n");
dev->stats.tx_errors++;
}
spin_unlock_irqrestore(&port->vio.lock, flags);
return NETDEV_TX_BUSY;
}
d = vio_dring_cur(dr);
tx_buf = port->tx_bufs[dr->prod].buf;
skb_copy_from_linear_data(skb, tx_buf + VNET_PACKET_SKIP, skb->len);
len = skb->len;
if (len < ETH_ZLEN) {
len = ETH_ZLEN;
memset(tx_buf+VNET_PACKET_SKIP+skb->len, 0, len - skb->len);
}
/* We don't rely on the ACKs to free the skb in vnet_start_xmit(),
* thus it is safe to not set VIO_ACK_ENABLE for each transmission:
* the protocol itself does not require it as long as the peer
* sends a VIO_SUBTYPE_ACK for VIO_DRING_STOPPED.
*
* An ACK for every packet in the ring is expensive as the
* sending of LDC messages is slow and affects performance.
*/
d->hdr.ack = VIO_ACK_DISABLE;
d->size = len;
d->ncookies = port->tx_bufs[dr->prod].ncookies;
for (i = 0; i < d->ncookies; i++)
d->cookies[i] = port->tx_bufs[dr->prod].cookies[i];
/* This has to be a non-SMP write barrier because we are writing
* to memory which is shared with the peer LDOM.
*/
wmb();
d->hdr.state = VIO_DESC_READY;
err = __vnet_tx_trigger(port);
if (unlikely(err < 0)) {
netdev_info(dev, "TX trigger error %d\n", err);
d->hdr.state = VIO_DESC_FREE;
dev->stats.tx_carrier_errors++;
goto out_dropped_unlock;
}
dev->stats.tx_packets++;
dev->stats.tx_bytes += skb->len;
dr->prod = (dr->prod + 1) & (VNET_TX_RING_SIZE - 1);
if (unlikely(vnet_tx_dring_avail(dr) < 2)) {
netif_stop_queue(dev);
if (vnet_tx_dring_avail(dr) > VNET_TX_WAKEUP_THRESH(dr))
netif_wake_queue(dev);
}
spin_unlock_irqrestore(&port->vio.lock, flags);
dev_kfree_skb(skb);
return NETDEV_TX_OK;
out_dropped_unlock:
spin_unlock_irqrestore(&port->vio.lock, flags);
out_dropped:
dev_kfree_skb(skb);
dev->stats.tx_dropped++;
return NETDEV_TX_OK;
}
static void vnet_tx_timeout(struct net_device *dev)
{
/* XXX Implement me XXX */
}
static int vnet_open(struct net_device *dev)
{
netif_carrier_on(dev);
netif_start_queue(dev);
return 0;
}
static int vnet_close(struct net_device *dev)
{
netif_stop_queue(dev);
netif_carrier_off(dev);
return 0;
}
static struct vnet_mcast_entry *__vnet_mc_find(struct vnet *vp, u8 *addr)
{
struct vnet_mcast_entry *m;
for (m = vp->mcast_list; m; m = m->next) {
if (ether_addr_equal(m->addr, addr))
return m;
}
return NULL;
}
static void __update_mc_list(struct vnet *vp, struct net_device *dev)
{
struct netdev_hw_addr *ha;
netdev_for_each_mc_addr(ha, dev) {
struct vnet_mcast_entry *m;
m = __vnet_mc_find(vp, ha->addr);
if (m) {
m->hit = 1;
continue;
}
if (!m) {
m = kzalloc(sizeof(*m), GFP_ATOMIC);
if (!m)
continue;
memcpy(m->addr, ha->addr, ETH_ALEN);
m->hit = 1;
m->next = vp->mcast_list;
vp->mcast_list = m;
}
}
}
static void __send_mc_list(struct vnet *vp, struct vnet_port *port)
{
struct vio_net_mcast_info info;
struct vnet_mcast_entry *m, **pp;
int n_addrs;
memset(&info, 0, sizeof(info));
info.tag.type = VIO_TYPE_CTRL;
info.tag.stype = VIO_SUBTYPE_INFO;
info.tag.stype_env = VNET_MCAST_INFO;
info.tag.sid = vio_send_sid(&port->vio);
info.set = 1;
n_addrs = 0;
for (m = vp->mcast_list; m; m = m->next) {
if (m->sent)
continue;
m->sent = 1;
memcpy(&info.mcast_addr[n_addrs * ETH_ALEN],
m->addr, ETH_ALEN);
if (++n_addrs == VNET_NUM_MCAST) {
info.count = n_addrs;
(void) vio_ldc_send(&port->vio, &info,
sizeof(info));
n_addrs = 0;
}
}
if (n_addrs) {
info.count = n_addrs;
(void) vio_ldc_send(&port->vio, &info, sizeof(info));
}
info.set = 0;
n_addrs = 0;
pp = &vp->mcast_list;
while ((m = *pp) != NULL) {
if (m->hit) {
m->hit = 0;
pp = &m->next;
continue;
}
memcpy(&info.mcast_addr[n_addrs * ETH_ALEN],
m->addr, ETH_ALEN);
if (++n_addrs == VNET_NUM_MCAST) {
info.count = n_addrs;
(void) vio_ldc_send(&port->vio, &info,
sizeof(info));
n_addrs = 0;
}
*pp = m->next;
kfree(m);
}
if (n_addrs) {
info.count = n_addrs;
(void) vio_ldc_send(&port->vio, &info, sizeof(info));
}
}
static void vnet_set_rx_mode(struct net_device *dev)
{
struct vnet *vp = netdev_priv(dev);
struct vnet_port *port;
unsigned long flags;
spin_lock_irqsave(&vp->lock, flags);
if (!list_empty(&vp->port_list)) {
port = list_entry(vp->port_list.next, struct vnet_port, list);
if (port->switch_port) {
__update_mc_list(vp, dev);
__send_mc_list(vp, port);
}
}
spin_unlock_irqrestore(&vp->lock, flags);
}
static int vnet_change_mtu(struct net_device *dev, int new_mtu)
{
if (new_mtu != ETH_DATA_LEN)
return -EINVAL;
dev->mtu = new_mtu;
return 0;
}
static int vnet_set_mac_addr(struct net_device *dev, void *p)
{
return -EINVAL;
}
static void vnet_get_drvinfo(struct net_device *dev,
struct ethtool_drvinfo *info)
{
strlcpy(info->driver, DRV_MODULE_NAME, sizeof(info->driver));
strlcpy(info->version, DRV_MODULE_VERSION, sizeof(info->version));
}
static u32 vnet_get_msglevel(struct net_device *dev)
{
struct vnet *vp = netdev_priv(dev);
return vp->msg_enable;
}
static void vnet_set_msglevel(struct net_device *dev, u32 value)
{
struct vnet *vp = netdev_priv(dev);
vp->msg_enable = value;
}
static const struct ethtool_ops vnet_ethtool_ops = {
.get_drvinfo = vnet_get_drvinfo,
.get_msglevel = vnet_get_msglevel,
.set_msglevel = vnet_set_msglevel,
.get_link = ethtool_op_get_link,
};
static void vnet_port_free_tx_bufs(struct vnet_port *port)
{
struct vio_dring_state *dr;
int i;
dr = &port->vio.drings[VIO_DRIVER_TX_RING];
if (dr->base) {
ldc_free_exp_dring(port->vio.lp, dr->base,
(dr->entry_size * dr->num_entries),
dr->cookies, dr->ncookies);
dr->base = NULL;
dr->entry_size = 0;
dr->num_entries = 0;
dr->pending = 0;
dr->ncookies = 0;
}
for (i = 0; i < VNET_TX_RING_SIZE; i++) {
void *buf = port->tx_bufs[i].buf;
if (!buf)
continue;
ldc_unmap(port->vio.lp,
port->tx_bufs[i].cookies,
port->tx_bufs[i].ncookies);
kfree(buf);
port->tx_bufs[i].buf = NULL;
}
}
static int vnet_port_alloc_tx_bufs(struct vnet_port *port)
{
struct vio_dring_state *dr;
unsigned long len;
int i, err, ncookies;
void *dring;
for (i = 0; i < VNET_TX_RING_SIZE; i++) {
void *buf = kzalloc(ETH_FRAME_LEN + 8, GFP_KERNEL);
int map_len = (ETH_FRAME_LEN + 7) & ~7;
err = -ENOMEM;
if (!buf)
goto err_out;
err = -EFAULT;
if ((unsigned long)buf & (8UL - 1)) {
pr_err("TX buffer misaligned\n");
kfree(buf);
goto err_out;
}
err = ldc_map_single(port->vio.lp, buf, map_len,
port->tx_bufs[i].cookies, 2,
(LDC_MAP_SHADOW |
LDC_MAP_DIRECT |
LDC_MAP_RW));
if (err < 0) {
kfree(buf);
goto err_out;
}
port->tx_bufs[i].buf = buf;
port->tx_bufs[i].ncookies = err;
}
dr = &port->vio.drings[VIO_DRIVER_TX_RING];
len = (VNET_TX_RING_SIZE *
(sizeof(struct vio_net_desc) +
(sizeof(struct ldc_trans_cookie) * 2)));
ncookies = VIO_MAX_RING_COOKIES;
dring = ldc_alloc_exp_dring(port->vio.lp, len,
dr->cookies, &ncookies,
(LDC_MAP_SHADOW |
LDC_MAP_DIRECT |
LDC_MAP_RW));
if (IS_ERR(dring)) {
err = PTR_ERR(dring);
goto err_out;
}
dr->base = dring;
dr->entry_size = (sizeof(struct vio_net_desc) +
(sizeof(struct ldc_trans_cookie) * 2));
dr->num_entries = VNET_TX_RING_SIZE;
dr->prod = dr->cons = 0;
dr->pending = VNET_TX_RING_SIZE;
dr->ncookies = ncookies;
return 0;
err_out:
vnet_port_free_tx_bufs(port);
return err;
}
static LIST_HEAD(vnet_list);
static DEFINE_MUTEX(vnet_list_mutex);
static const struct net_device_ops vnet_ops = {
.ndo_open = vnet_open,
.ndo_stop = vnet_close,
.ndo_set_rx_mode = vnet_set_rx_mode,
.ndo_set_mac_address = vnet_set_mac_addr,
.ndo_validate_addr = eth_validate_addr,
.ndo_tx_timeout = vnet_tx_timeout,
.ndo_change_mtu = vnet_change_mtu,
.ndo_start_xmit = vnet_start_xmit,
};
static struct vnet *vnet_new(const u64 *local_mac)
{
struct net_device *dev;
struct vnet *vp;
int err, i;
dev = alloc_etherdev(sizeof(*vp));
if (!dev)
return ERR_PTR(-ENOMEM);
for (i = 0; i < ETH_ALEN; i++)
dev->dev_addr[i] = (*local_mac >> (5 - i) * 8) & 0xff;
vp = netdev_priv(dev);
spin_lock_init(&vp->lock);
tasklet_init(&vp->vnet_tx_wakeup, maybe_tx_wakeup, (unsigned long)vp);
vp->dev = dev;
INIT_LIST_HEAD(&vp->port_list);
for (i = 0; i < VNET_PORT_HASH_SIZE; i++)
INIT_HLIST_HEAD(&vp->port_hash[i]);
INIT_LIST_HEAD(&vp->list);
vp->local_mac = *local_mac;
dev->netdev_ops = &vnet_ops;
dev->ethtool_ops = &vnet_ethtool_ops;
dev->watchdog_timeo = VNET_TX_TIMEOUT;
err = register_netdev(dev);
if (err) {
pr_err("Cannot register net device, aborting\n");
goto err_out_free_dev;
}
netdev_info(dev, "Sun LDOM vnet %pM\n", dev->dev_addr);
list_add(&vp->list, &vnet_list);
return vp;
err_out_free_dev:
free_netdev(dev);
return ERR_PTR(err);
}
static struct vnet *vnet_find_or_create(const u64 *local_mac)
{
struct vnet *iter, *vp;
mutex_lock(&vnet_list_mutex);
vp = NULL;
list_for_each_entry(iter, &vnet_list, list) {
if (iter->local_mac == *local_mac) {
vp = iter;
break;
}
}
if (!vp)
vp = vnet_new(local_mac);
mutex_unlock(&vnet_list_mutex);
return vp;
}
static void vnet_cleanup(void)
{
struct vnet *vp;
struct net_device *dev;
mutex_lock(&vnet_list_mutex);
while (!list_empty(&vnet_list)) {
vp = list_first_entry(&vnet_list, struct vnet, list);
list_del(&vp->list);
dev = vp->dev;
tasklet_kill(&vp->vnet_tx_wakeup);
/* vio_unregister_driver() should have cleaned up port_list */
BUG_ON(!list_empty(&vp->port_list));
unregister_netdev(dev);
free_netdev(dev);
}
mutex_unlock(&vnet_list_mutex);
}
static const char *local_mac_prop = "local-mac-address";
static struct vnet *vnet_find_parent(struct mdesc_handle *hp,
u64 port_node)
{
const u64 *local_mac = NULL;
u64 a;
mdesc_for_each_arc(a, hp, port_node, MDESC_ARC_TYPE_BACK) {
u64 target = mdesc_arc_target(hp, a);
const char *name;
name = mdesc_get_property(hp, target, "name", NULL);
if (!name || strcmp(name, "network"))
continue;
local_mac = mdesc_get_property(hp, target,
local_mac_prop, NULL);
if (local_mac)
break;
}
if (!local_mac)
return ERR_PTR(-ENODEV);
return vnet_find_or_create(local_mac);
}
static struct ldc_channel_config vnet_ldc_cfg = {
.event = vnet_event,
.mtu = 64,
.mode = LDC_MODE_UNRELIABLE,
};
static struct vio_driver_ops vnet_vio_ops = {
.send_attr = vnet_send_attr,
.handle_attr = vnet_handle_attr,
.handshake_complete = vnet_handshake_complete,
};
static void print_version(void)
{
printk_once(KERN_INFO "%s", version);
}
const char *remote_macaddr_prop = "remote-mac-address";
static int vnet_port_probe(struct vio_dev *vdev, const struct vio_device_id *id)
{
struct mdesc_handle *hp;
struct vnet_port *port;
unsigned long flags;
struct vnet *vp;
const u64 *rmac;
int len, i, err, switch_port;
print_version();
hp = mdesc_grab();
vp = vnet_find_parent(hp, vdev->mp);
if (IS_ERR(vp)) {
pr_err("Cannot find port parent vnet\n");
err = PTR_ERR(vp);
goto err_out_put_mdesc;
}
rmac = mdesc_get_property(hp, vdev->mp, remote_macaddr_prop, &len);
err = -ENODEV;
if (!rmac) {
pr_err("Port lacks %s property\n", remote_macaddr_prop);
goto err_out_put_mdesc;
}
port = kzalloc(sizeof(*port), GFP_KERNEL);
err = -ENOMEM;
if (!port)
goto err_out_put_mdesc;
for (i = 0; i < ETH_ALEN; i++)
port->raddr[i] = (*rmac >> (5 - i) * 8) & 0xff;
port->vp = vp;
err = vio_driver_init(&port->vio, vdev, VDEV_NETWORK,
vnet_versions, ARRAY_SIZE(vnet_versions),
&vnet_vio_ops, vp->dev->name);
if (err)
goto err_out_free_port;
err = vio_ldc_alloc(&port->vio, &vnet_ldc_cfg, port);
if (err)
goto err_out_free_port;
err = vnet_port_alloc_tx_bufs(port);
if (err)
goto err_out_free_ldc;
INIT_HLIST_NODE(&port->hash);
INIT_LIST_HEAD(&port->list);
switch_port = 0;
if (mdesc_get_property(hp, vdev->mp, "switch-port", NULL) != NULL)
switch_port = 1;
port->switch_port = switch_port;
spin_lock_irqsave(&vp->lock, flags);
if (switch_port)
list_add(&port->list, &vp->port_list);
else
list_add_tail(&port->list, &vp->port_list);
hlist_add_head(&port->hash, &vp->port_hash[vnet_hashfn(port->raddr)]);
spin_unlock_irqrestore(&vp->lock, flags);
dev_set_drvdata(&vdev->dev, port);
pr_info("%s: PORT ( remote-mac %pM%s )\n",
vp->dev->name, port->raddr, switch_port ? " switch-port" : "");
vio_port_up(&port->vio);
mdesc_release(hp);
return 0;
err_out_free_ldc:
vio_ldc_free(&port->vio);
err_out_free_port:
kfree(port);
err_out_put_mdesc:
mdesc_release(hp);
return err;
}
static int vnet_port_remove(struct vio_dev *vdev)
{
struct vnet_port *port = dev_get_drvdata(&vdev->dev);
if (port) {
struct vnet *vp = port->vp;
unsigned long flags;
del_timer_sync(&port->vio.timer);
spin_lock_irqsave(&vp->lock, flags);
list_del(&port->list);
hlist_del(&port->hash);
spin_unlock_irqrestore(&vp->lock, flags);
vnet_port_free_tx_bufs(port);
vio_ldc_free(&port->vio);
dev_set_drvdata(&vdev->dev, NULL);
kfree(port);
}
return 0;
}
static const struct vio_device_id vnet_port_match[] = {
{
.type = "vnet-port",
},
{},
};
MODULE_DEVICE_TABLE(vio, vnet_port_match);
static struct vio_driver vnet_port_driver = {
.id_table = vnet_port_match,
.probe = vnet_port_probe,
.remove = vnet_port_remove,
.name = "vnet_port",
};
static int __init vnet_init(void)
{
return vio_register_driver(&vnet_port_driver);
}
static void __exit vnet_exit(void)
{
vio_unregister_driver(&vnet_port_driver);
vnet_cleanup();
}
module_init(vnet_init);
module_exit(vnet_exit);