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path: root/drivers/net/rionet.c
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Diffstat (limited to 'drivers/net/rionet.c')
-rw-r--r--drivers/net/rionet.c317
1 files changed, 211 insertions, 106 deletions
diff --git a/drivers/net/rionet.c b/drivers/net/rionet.c
index 6d1f6ed3113f..318a0ef1af50 100644
--- a/drivers/net/rionet.c
+++ b/drivers/net/rionet.c
@@ -1,13 +1,9 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
/*
* rionet - Ethernet driver over RapidIO messaging services
*
* Copyright 2005 MontaVista Software, Inc.
* Matt Porter <mporter@kernel.crashing.org>
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2 of the License, or (at your
- * option) any later version.
*/
#include <linux/module.h>
@@ -24,6 +20,7 @@
#include <linux/skbuff.h>
#include <linux/crc32.h>
#include <linux/ethtool.h>
+#include <linux/reboot.h>
#define DRV_NAME "rionet"
#define DRV_VERSION "0.3"
@@ -48,6 +45,8 @@ MODULE_LICENSE("GPL");
#define RIONET_TX_RING_SIZE CONFIG_RIONET_TX_SIZE
#define RIONET_RX_RING_SIZE CONFIG_RIONET_RX_SIZE
#define RIONET_MAX_NETS 8
+#define RIONET_MSG_SIZE RIO_MAX_MSG_SIZE
+#define RIONET_MAX_MTU (RIONET_MSG_SIZE - ETH_HLEN)
struct rionet_private {
struct rio_mport *mport;
@@ -60,6 +59,7 @@ struct rionet_private {
spinlock_t lock;
spinlock_t tx_lock;
u32 msg_enable;
+ bool open;
};
struct rionet_peer {
@@ -71,6 +71,7 @@ struct rionet_peer {
struct rionet_net {
struct net_device *ndev;
struct list_head peers;
+ spinlock_t lock; /* net info access lock */
struct rio_dev **active;
int nact; /* number of active peers */
};
@@ -108,7 +109,7 @@ static int rionet_rx_clean(struct net_device *ndev)
skb_put(rnet->rx_skb[i], RIO_MAX_MSG_SIZE);
rnet->rx_skb[i]->protocol =
eth_type_trans(rnet->rx_skb[i], ndev);
- error = netif_rx(rnet->rx_skb[i]);
+ error = __netif_rx(rnet->rx_skb[i]);
if (error == NET_RX_DROP) {
ndev->stats.rx_dropped++;
@@ -165,7 +166,8 @@ static int rionet_queue_tx_msg(struct sk_buff *skb, struct net_device *ndev,
return 0;
}
-static int rionet_start_xmit(struct sk_buff *skb, struct net_device *ndev)
+static netdev_tx_t rionet_start_xmit(struct sk_buff *skb,
+ struct net_device *ndev)
{
int i;
struct rionet_private *rnet = netdev_priv(ndev);
@@ -174,11 +176,7 @@ static int rionet_start_xmit(struct sk_buff *skb, struct net_device *ndev)
unsigned long flags;
int add_num = 1;
- local_irq_save(flags);
- if (!spin_trylock(&rnet->tx_lock)) {
- local_irq_restore(flags);
- return NETDEV_TX_LOCKED;
- }
+ spin_lock_irqsave(&rnet->tx_lock, flags);
if (is_multicast_ether_addr(eth->h_dest))
add_num = nets[rnet->mport->id].nact;
@@ -200,7 +198,7 @@ static int rionet_start_xmit(struct sk_buff *skb, struct net_device *ndev)
rionet_queue_tx_msg(skb, ndev,
nets[rnet->mport->id].active[i]);
if (count)
- atomic_inc(&skb->users);
+ refcount_inc(&skb->users);
count++;
}
} else if (RIONET_MAC_MATCH(eth->h_dest)) {
@@ -215,9 +213,9 @@ static int rionet_start_xmit(struct sk_buff *skb, struct net_device *ndev)
* it just report sending a packet to the target
* (without actual packet transfer).
*/
- dev_kfree_skb_any(skb);
ndev->stats.tx_packets++;
ndev->stats.tx_bytes += skb->len;
+ dev_kfree_skb_any(skb);
}
}
@@ -232,26 +230,32 @@ static void rionet_dbell_event(struct rio_mport *mport, void *dev_id, u16 sid, u
struct net_device *ndev = dev_id;
struct rionet_private *rnet = netdev_priv(ndev);
struct rionet_peer *peer;
+ unsigned char netid = rnet->mport->id;
if (netif_msg_intr(rnet))
printk(KERN_INFO "%s: doorbell sid %4.4x tid %4.4x info %4.4x",
DRV_NAME, sid, tid, info);
if (info == RIONET_DOORBELL_JOIN) {
- if (!nets[rnet->mport->id].active[sid]) {
- list_for_each_entry(peer,
- &nets[rnet->mport->id].peers, node) {
+ if (!nets[netid].active[sid]) {
+ spin_lock(&nets[netid].lock);
+ list_for_each_entry(peer, &nets[netid].peers, node) {
if (peer->rdev->destid == sid) {
- nets[rnet->mport->id].active[sid] =
- peer->rdev;
- nets[rnet->mport->id].nact++;
+ nets[netid].active[sid] = peer->rdev;
+ nets[netid].nact++;
}
}
+ spin_unlock(&nets[netid].lock);
+
rio_mport_send_doorbell(mport, sid,
RIONET_DOORBELL_JOIN);
}
} else if (info == RIONET_DOORBELL_LEAVE) {
- nets[rnet->mport->id].active[sid] = NULL;
- nets[rnet->mport->id].nact--;
+ spin_lock(&nets[netid].lock);
+ if (nets[netid].active[sid]) {
+ nets[netid].active[sid] = NULL;
+ nets[netid].nact--;
+ }
+ spin_unlock(&nets[netid].lock);
} else {
if (netif_msg_intr(rnet))
printk(KERN_WARNING "%s: unhandled doorbell\n",
@@ -280,7 +284,7 @@ static void rionet_outb_msg_event(struct rio_mport *mport, void *dev_id, int mbo
struct net_device *ndev = dev_id;
struct rionet_private *rnet = netdev_priv(ndev);
- spin_lock(&rnet->lock);
+ spin_lock(&rnet->tx_lock);
if (netif_msg_intr(rnet))
printk(KERN_INFO
@@ -299,14 +303,16 @@ static void rionet_outb_msg_event(struct rio_mport *mport, void *dev_id, int mbo
if (rnet->tx_cnt < RIONET_TX_RING_SIZE)
netif_wake_queue(ndev);
- spin_unlock(&rnet->lock);
+ spin_unlock(&rnet->tx_lock);
}
static int rionet_open(struct net_device *ndev)
{
int i, rc = 0;
- struct rionet_peer *peer, *tmp;
+ struct rionet_peer *peer;
struct rionet_private *rnet = netdev_priv(ndev);
+ unsigned char netid = rnet->mport->id;
+ unsigned long flags;
if (netif_msg_ifup(rnet))
printk(KERN_INFO "%s: open\n", DRV_NAME);
@@ -345,20 +351,13 @@ static int rionet_open(struct net_device *ndev)
netif_carrier_on(ndev);
netif_start_queue(ndev);
- list_for_each_entry_safe(peer, tmp,
- &nets[rnet->mport->id].peers, node) {
- if (!(peer->res = rio_request_outb_dbell(peer->rdev,
- RIONET_DOORBELL_JOIN,
- RIONET_DOORBELL_LEAVE)))
- {
- printk(KERN_ERR "%s: error requesting doorbells\n",
- DRV_NAME);
- continue;
- }
-
+ spin_lock_irqsave(&nets[netid].lock, flags);
+ list_for_each_entry(peer, &nets[netid].peers, node) {
/* Send a join message */
rio_send_doorbell(peer->rdev, RIONET_DOORBELL_JOIN);
}
+ spin_unlock_irqrestore(&nets[netid].lock, flags);
+ rnet->open = true;
out:
return rc;
@@ -367,7 +366,9 @@ static int rionet_open(struct net_device *ndev)
static int rionet_close(struct net_device *ndev)
{
struct rionet_private *rnet = netdev_priv(ndev);
- struct rionet_peer *peer, *tmp;
+ struct rionet_peer *peer;
+ unsigned char netid = rnet->mport->id;
+ unsigned long flags;
int i;
if (netif_msg_ifup(rnet))
@@ -375,18 +376,21 @@ static int rionet_close(struct net_device *ndev)
netif_stop_queue(ndev);
netif_carrier_off(ndev);
+ rnet->open = false;
for (i = 0; i < RIONET_RX_RING_SIZE; i++)
kfree_skb(rnet->rx_skb[i]);
- list_for_each_entry_safe(peer, tmp,
- &nets[rnet->mport->id].peers, node) {
- if (nets[rnet->mport->id].active[peer->rdev->destid]) {
+ spin_lock_irqsave(&nets[netid].lock, flags);
+ list_for_each_entry(peer, &nets[netid].peers, node) {
+ if (nets[netid].active[peer->rdev->destid]) {
rio_send_doorbell(peer->rdev, RIONET_DOORBELL_LEAVE);
- nets[rnet->mport->id].active[peer->rdev->destid] = NULL;
+ nets[netid].active[peer->rdev->destid] = NULL;
}
- rio_release_outb_dbell(peer->rdev, peer->res);
+ if (peer->res)
+ rio_release_outb_dbell(peer->rdev, peer->res);
}
+ spin_unlock_irqrestore(&nets[netid].lock, flags);
rio_release_inb_dbell(rnet->mport, RIONET_DOORBELL_JOIN,
RIONET_DOORBELL_LEAVE);
@@ -396,28 +400,42 @@ static int rionet_close(struct net_device *ndev)
return 0;
}
-static int rionet_remove_dev(struct device *dev, struct subsys_interface *sif)
+static void rionet_remove_dev(struct device *dev, struct subsys_interface *sif)
{
struct rio_dev *rdev = to_rio_dev(dev);
unsigned char netid = rdev->net->hport->id;
- struct rionet_peer *peer, *tmp;
+ struct rionet_peer *peer;
+ int state, found = 0;
+ unsigned long flags;
- if (dev_rionet_capable(rdev)) {
- list_for_each_entry_safe(peer, tmp, &nets[netid].peers, node) {
- if (peer->rdev == rdev) {
- if (nets[netid].active[rdev->destid]) {
- nets[netid].active[rdev->destid] = NULL;
- nets[netid].nact--;
+ if (!dev_rionet_capable(rdev))
+ return;
+
+ spin_lock_irqsave(&nets[netid].lock, flags);
+ list_for_each_entry(peer, &nets[netid].peers, node) {
+ if (peer->rdev == rdev) {
+ list_del(&peer->node);
+ if (nets[netid].active[rdev->destid]) {
+ state = atomic_read(&rdev->state);
+ if (state != RIO_DEVICE_GONE &&
+ state != RIO_DEVICE_INITIALIZING) {
+ rio_send_doorbell(rdev,
+ RIONET_DOORBELL_LEAVE);
}
-
- list_del(&peer->node);
- kfree(peer);
- break;
+ nets[netid].active[rdev->destid] = NULL;
+ nets[netid].nact--;
}
+ found = 1;
+ break;
}
}
+ spin_unlock_irqrestore(&nets[netid].lock, flags);
- return 0;
+ if (found) {
+ if (peer->res)
+ rio_release_outb_dbell(rdev, peer->res);
+ kfree(peer);
+ }
}
static void rionet_get_drvinfo(struct net_device *ndev,
@@ -425,10 +443,10 @@ static void rionet_get_drvinfo(struct net_device *ndev,
{
struct rionet_private *rnet = netdev_priv(ndev);
- strlcpy(info->driver, DRV_NAME, sizeof(info->driver));
- strlcpy(info->version, DRV_VERSION, sizeof(info->version));
- strlcpy(info->fw_version, "n/a", sizeof(info->fw_version));
- strlcpy(info->bus_info, rnet->mport->name, sizeof(info->bus_info));
+ strscpy(info->driver, DRV_NAME, sizeof(info->driver));
+ strscpy(info->version, DRV_VERSION, sizeof(info->version));
+ strscpy(info->fw_version, "n/a", sizeof(info->fw_version));
+ strscpy(info->bus_info, rnet->mport->name, sizeof(info->bus_info));
}
static u32 rionet_get_msglevel(struct net_device *ndev)
@@ -456,7 +474,6 @@ static const struct net_device_ops rionet_netdev_ops = {
.ndo_open = rionet_open,
.ndo_stop = rionet_close,
.ndo_start_xmit = rionet_start_xmit,
- .ndo_change_mtu = eth_change_mtu,
.ndo_validate_addr = eth_validate_addr,
.ndo_set_mac_address = eth_mac_addr,
};
@@ -465,6 +482,7 @@ static int rionet_setup_netdev(struct rio_mport *mport, struct net_device *ndev)
{
int rc = 0;
struct rionet_private *rnet;
+ u8 addr[ETH_ALEN];
u16 device_id;
const size_t rionet_active_bytes = sizeof(void *) *
RIO_MAX_ROUTE_ENTRIES(mport->sys_size);
@@ -480,20 +498,26 @@ static int rionet_setup_netdev(struct rio_mport *mport, struct net_device *ndev)
/* Set up private area */
rnet = netdev_priv(ndev);
rnet->mport = mport;
+ rnet->open = false;
/* Set the default MAC address */
device_id = rio_local_get_device_id(mport);
- ndev->dev_addr[0] = 0x00;
- ndev->dev_addr[1] = 0x01;
- ndev->dev_addr[2] = 0x00;
- ndev->dev_addr[3] = 0x01;
- ndev->dev_addr[4] = device_id >> 8;
- ndev->dev_addr[5] = device_id & 0xff;
+ addr[0] = 0x00;
+ addr[1] = 0x01;
+ addr[2] = 0x00;
+ addr[3] = 0x01;
+ addr[4] = device_id >> 8;
+ addr[5] = device_id & 0xff;
+ eth_hw_addr_set(ndev, addr);
ndev->netdev_ops = &rionet_netdev_ops;
- ndev->mtu = RIO_MAX_MSG_SIZE - 14;
- ndev->features = NETIF_F_LLTX;
- SET_ETHTOOL_OPS(ndev, &rionet_ethtool_ops);
+ ndev->mtu = RIONET_MAX_MTU;
+ /* MTU range: 68 - 4082 */
+ ndev->min_mtu = ETH_MIN_MTU;
+ ndev->max_mtu = RIONET_MAX_MTU;
+ ndev->lltx = true;
+ SET_NETDEV_DEV(ndev, &mport->dev);
+ ndev->ethtool_ops = &rionet_ethtool_ops;
spin_lock_init(&rnet->lock);
spin_lock_init(&rnet->tx_lock);
@@ -501,8 +525,11 @@ static int rionet_setup_netdev(struct rio_mport *mport, struct net_device *ndev)
rnet->msg_enable = RIONET_DEFAULT_MSGLEVEL;
rc = register_netdev(ndev);
- if (rc != 0)
+ if (rc != 0) {
+ free_pages((unsigned long)nets[mport->id].active,
+ get_order(rionet_active_bytes));
goto out;
+ }
printk(KERN_INFO "%s: %s %s Version %s, MAC %pM, %s\n",
ndev->name,
@@ -516,8 +543,6 @@ static int rionet_setup_netdev(struct rio_mport *mport, struct net_device *ndev)
return rc;
}
-static unsigned long net_table[RIONET_MAX_NETS/sizeof(unsigned long) + 1];
-
static int rionet_add_dev(struct device *dev, struct subsys_interface *sif)
{
int rc = -ENODEV;
@@ -526,19 +551,16 @@ static int rionet_add_dev(struct device *dev, struct subsys_interface *sif)
struct net_device *ndev = NULL;
struct rio_dev *rdev = to_rio_dev(dev);
unsigned char netid = rdev->net->hport->id;
- int oldnet;
if (netid >= RIONET_MAX_NETS)
return rc;
- oldnet = test_and_set_bit(netid, net_table);
-
/*
* If first time through this net, make sure local device is rionet
* capable and setup netdev (this step will be skipped in later probes
* on the same net).
*/
- if (!oldnet) {
+ if (!nets[netid].ndev) {
rio_local_read_config_32(rdev->net->hport, RIO_SRC_OPS_CAR,
&lsrc_ops);
rio_local_read_config_32(rdev->net->hport, RIO_DST_OPS_CAR,
@@ -556,30 +578,56 @@ static int rionet_add_dev(struct device *dev, struct subsys_interface *sif)
rc = -ENOMEM;
goto out;
}
- nets[netid].ndev = ndev;
+
rc = rionet_setup_netdev(rdev->net->hport, ndev);
if (rc) {
printk(KERN_ERR "%s: failed to setup netdev (rc=%d)\n",
DRV_NAME, rc);
+ free_netdev(ndev);
goto out;
}
INIT_LIST_HEAD(&nets[netid].peers);
+ spin_lock_init(&nets[netid].lock);
nets[netid].nact = 0;
- } else if (nets[netid].ndev == NULL)
- goto out;
+ nets[netid].ndev = ndev;
+ }
/*
* If the remote device has mailbox/doorbell capabilities,
* add it to the peer list.
*/
if (dev_rionet_capable(rdev)) {
- if (!(peer = kmalloc(sizeof(struct rionet_peer), GFP_KERNEL))) {
+ struct rionet_private *rnet;
+ unsigned long flags;
+
+ rnet = netdev_priv(nets[netid].ndev);
+
+ peer = kzalloc(sizeof(*peer), GFP_KERNEL);
+ if (!peer) {
rc = -ENOMEM;
goto out;
}
peer->rdev = rdev;
+ peer->res = rio_request_outb_dbell(peer->rdev,
+ RIONET_DOORBELL_JOIN,
+ RIONET_DOORBELL_LEAVE);
+ if (!peer->res) {
+ pr_err("%s: error requesting doorbells\n", DRV_NAME);
+ kfree(peer);
+ rc = -ENOMEM;
+ goto out;
+ }
+
+ spin_lock_irqsave(&nets[netid].lock, flags);
list_add_tail(&peer->node, &nets[netid].peers);
+ spin_unlock_irqrestore(&nets[netid].lock, flags);
+ pr_debug("%s: %s add peer %s\n",
+ DRV_NAME, __func__, rio_name(rdev));
+
+ /* If netdev is already opened, send join request to new peer */
+ if (rnet->open)
+ rio_send_doorbell(peer->rdev, RIONET_DOORBELL_JOIN);
}
return 0;
@@ -587,6 +635,60 @@ out:
return rc;
}
+static int rionet_shutdown(struct notifier_block *nb, unsigned long code,
+ void *unused)
+{
+ struct rionet_peer *peer;
+ unsigned long flags;
+ int i;
+
+ pr_debug("%s: %s\n", DRV_NAME, __func__);
+
+ for (i = 0; i < RIONET_MAX_NETS; i++) {
+ if (!nets[i].ndev)
+ continue;
+
+ spin_lock_irqsave(&nets[i].lock, flags);
+ list_for_each_entry(peer, &nets[i].peers, node) {
+ if (nets[i].active[peer->rdev->destid]) {
+ rio_send_doorbell(peer->rdev,
+ RIONET_DOORBELL_LEAVE);
+ nets[i].active[peer->rdev->destid] = NULL;
+ }
+ }
+ spin_unlock_irqrestore(&nets[i].lock, flags);
+ }
+
+ return NOTIFY_DONE;
+}
+
+static void rionet_remove_mport(struct device *dev)
+{
+ struct rio_mport *mport = to_rio_mport(dev);
+ struct net_device *ndev;
+ int id = mport->id;
+
+ pr_debug("%s %s\n", __func__, mport->name);
+
+ WARN(nets[id].nact, "%s called when connected to %d peers\n",
+ __func__, nets[id].nact);
+ WARN(!nets[id].ndev, "%s called for mport without NDEV\n",
+ __func__);
+
+ if (nets[id].ndev) {
+ ndev = nets[id].ndev;
+ netif_stop_queue(ndev);
+ unregister_netdev(ndev);
+
+ free_pages((unsigned long)nets[id].active,
+ get_order(sizeof(void *) *
+ RIO_MAX_ROUTE_ENTRIES(mport->sys_size)));
+ nets[id].active = NULL;
+ free_netdev(ndev);
+ nets[id].ndev = NULL;
+ }
+}
+
#ifdef MODULE
static struct rio_device_id rionet_id_table[] = {
{RIO_DEVICE(RIO_ANY_ID, RIO_ANY_ID)},
@@ -603,40 +705,43 @@ static struct subsys_interface rionet_interface = {
.remove_dev = rionet_remove_dev,
};
+static struct notifier_block rionet_notifier = {
+ .notifier_call = rionet_shutdown,
+};
+
+/* the rio_mport_interface is used to handle local mport devices */
+static struct class_interface rio_mport_interface __refdata = {
+ .class = &rio_mport_class,
+ .add_dev = NULL,
+ .remove_dev = rionet_remove_mport,
+};
+
static int __init rionet_init(void)
{
+ int ret;
+
+ ret = register_reboot_notifier(&rionet_notifier);
+ if (ret) {
+ pr_err("%s: failed to register reboot notifier (err=%d)\n",
+ DRV_NAME, ret);
+ return ret;
+ }
+
+ ret = class_interface_register(&rio_mport_interface);
+ if (ret) {
+ pr_err("%s: class_interface_register error: %d\n",
+ DRV_NAME, ret);
+ return ret;
+ }
+
return subsys_interface_register(&rionet_interface);
}
static void __exit rionet_exit(void)
{
- struct rionet_private *rnet;
- struct net_device *ndev;
- struct rionet_peer *peer, *tmp;
- int i;
-
- for (i = 0; i < RIONET_MAX_NETS; i++) {
- if (nets[i].ndev != NULL) {
- ndev = nets[i].ndev;
- rnet = netdev_priv(ndev);
- unregister_netdev(ndev);
-
- list_for_each_entry_safe(peer,
- tmp, &nets[i].peers, node) {
- list_del(&peer->node);
- kfree(peer);
- }
-
- free_pages((unsigned long)nets[i].active,
- get_order(sizeof(void *) *
- RIO_MAX_ROUTE_ENTRIES(rnet->mport->sys_size)));
- nets[i].active = NULL;
-
- free_netdev(ndev);
- }
- }
-
+ unregister_reboot_notifier(&rionet_notifier);
subsys_interface_unregister(&rionet_interface);
+ class_interface_unregister(&rio_mport_interface);
}
late_initcall(rionet_init);
generated by cgit (git 2.34.1) at 2025-12-22 01:47:39 +0000