-/* File veth.c created by Kyle A. Lucke on Mon Aug 7 2000. */
-/*
- * IBM eServer iSeries Virtual Ethernet Device Driver
- * Copyright (C) 2001 Kyle A. Lucke (klucke@us.ibm.com), IBM Corp.
- * Substantially cleaned up by:
- * Copyright (C) 2003 David Gibson <dwg@au1.ibm.com>, IBM Corporation.
- * Copyright (C) 2004-2005 Michael Ellerman, IBM Corporation.
- *
- * 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.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
- * USA
- *
- *
- * This module implements the virtual ethernet device for iSeries LPAR
- * Linux. It uses hypervisor message passing to implement an
- * ethernet-like network device communicating between partitions on
- * the iSeries.
- *
- * The iSeries LPAR hypervisor currently allows for up to 16 different
- * virtual ethernets. These are all dynamically configurable on
- * OS/400 partitions, but dynamic configuration is not supported under
- * Linux yet. An ethXX network device will be created for each
- * virtual ethernet this partition is connected to.
- *
- * - This driver is responsible for routing packets to and from other
- * partitions. The MAC addresses used by the virtual ethernets
- * contains meaning and must not be modified.
- *
- * - Having 2 virtual ethernets to the same remote partition DOES NOT
- * double the available bandwidth. The 2 devices will share the
- * available hypervisor bandwidth.
- *
- * - If you send a packet to your own mac address, it will just be
- * dropped, you won't get it on the receive side.
- *
- * - Multicast is implemented by sending the frame frame to every
- * other partition. It is the responsibility of the receiving
- * partition to filter the addresses desired.
- *
- * Tunable parameters:
- *
- * VETH_NUMBUFFERS: This compile time option defaults to 120. It
- * controls how much memory Linux will allocate per remote partition
- * it is communicating with. It can be thought of as the maximum
- * number of packets outstanding to a remote partition at a time.
- */
-
-#include <linux/module.h>
-#include <linux/types.h>
-#include <linux/errno.h>
-#include <linux/ioport.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/if_ether.h>
-#include <linux/slab.h>
-
-#include <asm/abs_addr.h>
-#include <asm/iseries/mf.h>
-#include <asm/uaccess.h>
-#include <asm/firmware.h>
-#include <asm/iseries/hv_lp_config.h>
-#include <asm/iseries/hv_types.h>
-#include <asm/iseries/hv_lp_event.h>
-#include <asm/iommu.h>
-#include <asm/vio.h>
-
-#undef DEBUG
-
-MODULE_AUTHOR("Kyle Lucke <klucke@us.ibm.com>");
-MODULE_DESCRIPTION("iSeries Virtual ethernet driver");
-MODULE_LICENSE("GPL");
-
-#define VETH_EVENT_CAP (0)
-#define VETH_EVENT_FRAMES (1)
-#define VETH_EVENT_MONITOR (2)
-#define VETH_EVENT_FRAMES_ACK (3)
-
-#define VETH_MAX_ACKS_PER_MSG (20)
-#define VETH_MAX_FRAMES_PER_MSG (6)
-
-struct veth_frames_data {
- u32 addr[VETH_MAX_FRAMES_PER_MSG];
- u16 len[VETH_MAX_FRAMES_PER_MSG];
- u32 eofmask;
-};
-#define VETH_EOF_SHIFT (32-VETH_MAX_FRAMES_PER_MSG)
-
-struct veth_frames_ack_data {
- u16 token[VETH_MAX_ACKS_PER_MSG];
-};
-
-struct veth_cap_data {
- u8 caps_version;
- u8 rsvd1;
- u16 num_buffers;
- u16 ack_threshold;
- u16 rsvd2;
- u32 ack_timeout;
- u32 rsvd3;
- u64 rsvd4[3];
-};
-
-struct veth_lpevent {
- struct HvLpEvent base_event;
- union {
- struct veth_cap_data caps_data;
- struct veth_frames_data frames_data;
- struct veth_frames_ack_data frames_ack_data;
- } u;
-
-};
-
-#define DRV_NAME "iseries_veth"
-#define DRV_VERSION "2.0"
-
-#define VETH_NUMBUFFERS (120)
-#define VETH_ACKTIMEOUT (1000000) /* microseconds */
-#define VETH_MAX_MCAST (12)
-
-#define VETH_MAX_MTU (9000)
-
-#if VETH_NUMBUFFERS < 10
-#define ACK_THRESHOLD (1)
-#elif VETH_NUMBUFFERS < 20
-#define ACK_THRESHOLD (4)
-#elif VETH_NUMBUFFERS < 40
-#define ACK_THRESHOLD (10)
-#else
-#define ACK_THRESHOLD (20)
-#endif
-
-#define VETH_STATE_SHUTDOWN (0x0001)
-#define VETH_STATE_OPEN (0x0002)
-#define VETH_STATE_RESET (0x0004)
-#define VETH_STATE_SENTMON (0x0008)
-#define VETH_STATE_SENTCAPS (0x0010)
-#define VETH_STATE_GOTCAPACK (0x0020)
-#define VETH_STATE_GOTCAPS (0x0040)
-#define VETH_STATE_SENTCAPACK (0x0080)
-#define VETH_STATE_READY (0x0100)
-
-struct veth_msg {
- struct veth_msg *next;
- struct veth_frames_data data;
- int token;
- int in_use;
- struct sk_buff *skb;
- struct device *dev;
-};
-
-struct veth_lpar_connection {
- HvLpIndex remote_lp;
- struct delayed_work statemachine_wq;
- struct veth_msg *msgs;
- int num_events;
- struct veth_cap_data local_caps;
-
- struct kobject kobject;
- struct timer_list ack_timer;
-
- struct timer_list reset_timer;
- unsigned int reset_timeout;
- unsigned long last_contact;
- int outstanding_tx;
-
- spinlock_t lock;
- unsigned long state;
- HvLpInstanceId src_inst;
- HvLpInstanceId dst_inst;
- struct veth_lpevent cap_event, cap_ack_event;
- u16 pending_acks[VETH_MAX_ACKS_PER_MSG];
- u32 num_pending_acks;
-
- int num_ack_events;
- struct veth_cap_data remote_caps;
- u32 ack_timeout;
-
- struct veth_msg *msg_stack_head;
-};
-
-struct veth_port {
- struct device *dev;
- u64 mac_addr;
- HvLpIndexMap lpar_map;
-
- /* queue_lock protects the stopped_map and dev's queue. */
- spinlock_t queue_lock;
- HvLpIndexMap stopped_map;
-
- /* mcast_gate protects promiscuous, num_mcast & mcast_addr. */
- rwlock_t mcast_gate;
- int promiscuous;
- int num_mcast;
- u64 mcast_addr[VETH_MAX_MCAST];
-
- struct kobject kobject;
-};
-
-static HvLpIndex this_lp;
-static struct veth_lpar_connection *veth_cnx[HVMAXARCHITECTEDLPS]; /* = 0 */
-static struct net_device *veth_dev[HVMAXARCHITECTEDVIRTUALLANS]; /* = 0 */
-
-static int veth_start_xmit(struct sk_buff *skb, struct net_device *dev);
-static void veth_recycle_msg(struct veth_lpar_connection *, struct veth_msg *);
-static void veth_wake_queues(struct veth_lpar_connection *cnx);
-static void veth_stop_queues(struct veth_lpar_connection *cnx);
-static void veth_receive(struct veth_lpar_connection *, struct veth_lpevent *);
-static void veth_release_connection(struct kobject *kobject);
-static void veth_timed_ack(unsigned long ptr);
-static void veth_timed_reset(unsigned long ptr);
-
-/*
- * Utility functions
- */
-
-#define veth_info(fmt, args...) \
- printk(KERN_INFO DRV_NAME ": " fmt, ## args)
-
-#define veth_error(fmt, args...) \
- printk(KERN_ERR DRV_NAME ": Error: " fmt, ## args)
-
-#ifdef DEBUG
-#define veth_debug(fmt, args...) \
- printk(KERN_DEBUG DRV_NAME ": " fmt, ## args)
-#else
-#define veth_debug(fmt, args...) do {} while (0)
-#endif
-
-/* You must hold the connection's lock when you call this function. */
-static inline void veth_stack_push(struct veth_lpar_connection *cnx,
- struct veth_msg *msg)
-{
- msg->next = cnx->msg_stack_head;
- cnx->msg_stack_head = msg;
-}
-
-/* You must hold the connection's lock when you call this function. */
-static inline struct veth_msg *veth_stack_pop(struct veth_lpar_connection *cnx)
-{
- struct veth_msg *msg;
-
- msg = cnx->msg_stack_head;
- if (msg)
- cnx->msg_stack_head = cnx->msg_stack_head->next;
-
- return msg;
-}
-
-/* You must hold the connection's lock when you call this function. */
-static inline int veth_stack_is_empty(struct veth_lpar_connection *cnx)
-{
- return cnx->msg_stack_head == NULL;
-}
-
-static inline HvLpEvent_Rc
-veth_signalevent(struct veth_lpar_connection *cnx, u16 subtype,
- HvLpEvent_AckInd ackind, HvLpEvent_AckType acktype,
- u64 token,
- u64 data1, u64 data2, u64 data3, u64 data4, u64 data5)
-{
- return HvCallEvent_signalLpEventFast(cnx->remote_lp,
- HvLpEvent_Type_VirtualLan,
- subtype, ackind, acktype,
- cnx->src_inst,
- cnx->dst_inst,
- token, data1, data2, data3,
- data4, data5);
-}
-
-static inline HvLpEvent_Rc veth_signaldata(struct veth_lpar_connection *cnx,
- u16 subtype, u64 token, void *data)
-{
- u64 *p = (u64 *) data;
-
- return veth_signalevent(cnx, subtype, HvLpEvent_AckInd_NoAck,
- HvLpEvent_AckType_ImmediateAck,
- token, p[0], p[1], p[2], p[3], p[4]);
-}
-
-struct veth_allocation {
- struct completion c;
- int num;
-};
-
-static void veth_complete_allocation(void *parm, int number)
-{
- struct veth_allocation *vc = (struct veth_allocation *)parm;
-
- vc->num = number;
- complete(&vc->c);
-}
-
-static int veth_allocate_events(HvLpIndex rlp, int number)
-{
- struct veth_allocation vc =
- { COMPLETION_INITIALIZER_ONSTACK(vc.c), 0 };
-
- mf_allocate_lp_events(rlp, HvLpEvent_Type_VirtualLan,
- sizeof(struct veth_lpevent), number,
- &veth_complete_allocation, &vc);
- wait_for_completion(&vc.c);
-
- return vc.num;
-}
-
-/*
- * sysfs support
- */
-
-struct veth_cnx_attribute {
- struct attribute attr;
- ssize_t (*show)(struct veth_lpar_connection *, char *buf);
- ssize_t (*store)(struct veth_lpar_connection *, const char *buf);
-};
-
-static ssize_t veth_cnx_attribute_show(struct kobject *kobj,
- struct attribute *attr, char *buf)
-{
- struct veth_cnx_attribute *cnx_attr;
- struct veth_lpar_connection *cnx;
-
- cnx_attr = container_of(attr, struct veth_cnx_attribute, attr);
- cnx = container_of(kobj, struct veth_lpar_connection, kobject);
-
- if (!cnx_attr->show)
- return -EIO;
-
- return cnx_attr->show(cnx, buf);
-}
-
-#define CUSTOM_CNX_ATTR(_name, _format, _expression) \
-static ssize_t _name##_show(struct veth_lpar_connection *cnx, char *buf)\
-{ \
- return sprintf(buf, _format, _expression); \
-} \
-struct veth_cnx_attribute veth_cnx_attr_##_name = __ATTR_RO(_name)
-
-#define SIMPLE_CNX_ATTR(_name) \
- CUSTOM_CNX_ATTR(_name, "%lu\n", (unsigned long)cnx->_name)
-
-SIMPLE_CNX_ATTR(outstanding_tx);
-SIMPLE_CNX_ATTR(remote_lp);
-SIMPLE_CNX_ATTR(num_events);
-SIMPLE_CNX_ATTR(src_inst);
-SIMPLE_CNX_ATTR(dst_inst);
-SIMPLE_CNX_ATTR(num_pending_acks);
-SIMPLE_CNX_ATTR(num_ack_events);
-CUSTOM_CNX_ATTR(ack_timeout, "%d\n", jiffies_to_msecs(cnx->ack_timeout));
-CUSTOM_CNX_ATTR(reset_timeout, "%d\n", jiffies_to_msecs(cnx->reset_timeout));
-CUSTOM_CNX_ATTR(state, "0x%.4lX\n", cnx->state);
-CUSTOM_CNX_ATTR(last_contact, "%d\n", cnx->last_contact ?
- jiffies_to_msecs(jiffies - cnx->last_contact) : 0);
-
-#define GET_CNX_ATTR(_name) (&veth_cnx_attr_##_name.attr)
-
-static struct attribute *veth_cnx_default_attrs[] = {
- GET_CNX_ATTR(outstanding_tx),
- GET_CNX_ATTR(remote_lp),
- GET_CNX_ATTR(num_events),
- GET_CNX_ATTR(reset_timeout),
- GET_CNX_ATTR(last_contact),
- GET_CNX_ATTR(state),
- GET_CNX_ATTR(src_inst),
- GET_CNX_ATTR(dst_inst),
- GET_CNX_ATTR(num_pending_acks),
- GET_CNX_ATTR(num_ack_events),
- GET_CNX_ATTR(ack_timeout),
- NULL
-};
-
-static const struct sysfs_ops veth_cnx_sysfs_ops = {
- .show = veth_cnx_attribute_show
-};
-
-static struct kobj_type veth_lpar_connection_ktype = {
- .release = veth_release_connection,
- .sysfs_ops = &veth_cnx_sysfs_ops,
- .default_attrs = veth_cnx_default_attrs
-};
-
-struct veth_port_attribute {
- struct attribute attr;
- ssize_t (*show)(struct veth_port *, char *buf);
- ssize_t (*store)(struct veth_port *, const char *buf);
-};
-
-static ssize_t veth_port_attribute_show(struct kobject *kobj,
- struct attribute *attr, char *buf)
-{
- struct veth_port_attribute *port_attr;
- struct veth_port *port;
-
- port_attr = container_of(attr, struct veth_port_attribute, attr);
- port = container_of(kobj, struct veth_port, kobject);
-
- if (!port_attr->show)
- return -EIO;
-
- return port_attr->show(port, buf);
-}
-
-#define CUSTOM_PORT_ATTR(_name, _format, _expression) \
-static ssize_t _name##_show(struct veth_port *port, char *buf) \
-{ \
- return sprintf(buf, _format, _expression); \
-} \
-struct veth_port_attribute veth_port_attr_##_name = __ATTR_RO(_name)
-
-#define SIMPLE_PORT_ATTR(_name) \
- CUSTOM_PORT_ATTR(_name, "%lu\n", (unsigned long)port->_name)
-
-SIMPLE_PORT_ATTR(promiscuous);
-SIMPLE_PORT_ATTR(num_mcast);
-CUSTOM_PORT_ATTR(lpar_map, "0x%X\n", port->lpar_map);
-CUSTOM_PORT_ATTR(stopped_map, "0x%X\n", port->stopped_map);
-CUSTOM_PORT_ATTR(mac_addr, "0x%llX\n", port->mac_addr);
-
-#define GET_PORT_ATTR(_name) (&veth_port_attr_##_name.attr)
-static struct attribute *veth_port_default_attrs[] = {
- GET_PORT_ATTR(mac_addr),
- GET_PORT_ATTR(lpar_map),
- GET_PORT_ATTR(stopped_map),
- GET_PORT_ATTR(promiscuous),
- GET_PORT_ATTR(num_mcast),
- NULL
-};
-
-static const struct sysfs_ops veth_port_sysfs_ops = {
- .show = veth_port_attribute_show
-};
-
-static struct kobj_type veth_port_ktype = {
- .sysfs_ops = &veth_port_sysfs_ops,
- .default_attrs = veth_port_default_attrs
-};
-
-/*
- * LPAR connection code
- */
-
-static inline void veth_kick_statemachine(struct veth_lpar_connection *cnx)
-{
- schedule_delayed_work(&cnx->statemachine_wq, 0);
-}
-
-static void veth_take_cap(struct veth_lpar_connection *cnx,
- struct veth_lpevent *event)
-{
- unsigned long flags;
-
- spin_lock_irqsave(&cnx->lock, flags);
- /* Receiving caps may mean the other end has just come up, so
- * we need to reload the instance ID of the far end */
- cnx->dst_inst =
- HvCallEvent_getTargetLpInstanceId(cnx->remote_lp,
- HvLpEvent_Type_VirtualLan);
-
- if (cnx->state & VETH_STATE_GOTCAPS) {
- veth_error("Received a second capabilities from LPAR %d.\n",
- cnx->remote_lp);
- event->base_event.xRc = HvLpEvent_Rc_BufferNotAvailable;
- HvCallEvent_ackLpEvent((struct HvLpEvent *) event);
- } else {
- memcpy(&cnx->cap_event, event, sizeof(cnx->cap_event));
- cnx->state |= VETH_STATE_GOTCAPS;
- veth_kick_statemachine(cnx);
- }
- spin_unlock_irqrestore(&cnx->lock, flags);
-}
-
-static void veth_take_cap_ack(struct veth_lpar_connection *cnx,
- struct veth_lpevent *event)
-{
- unsigned long flags;
-
- spin_lock_irqsave(&cnx->lock, flags);
- if (cnx->state & VETH_STATE_GOTCAPACK) {
- veth_error("Received a second capabilities ack from LPAR %d.\n",
- cnx->remote_lp);
- } else {
- memcpy(&cnx->cap_ack_event, event,
- sizeof(cnx->cap_ack_event));
- cnx->state |= VETH_STATE_GOTCAPACK;
- veth_kick_statemachine(cnx);
- }
- spin_unlock_irqrestore(&cnx->lock, flags);
-}
-
-static void veth_take_monitor_ack(struct veth_lpar_connection *cnx,
- struct veth_lpevent *event)
-{
- unsigned long flags;
-
- spin_lock_irqsave(&cnx->lock, flags);
- veth_debug("cnx %d: lost connection.\n", cnx->remote_lp);
-
- /* Avoid kicking the statemachine once we're shutdown.
- * It's unnecessary and it could break veth_stop_connection(). */
-
- if (! (cnx->state & VETH_STATE_SHUTDOWN)) {
- cnx->state |= VETH_STATE_RESET;
- veth_kick_statemachine(cnx);
- }
- spin_unlock_irqrestore(&cnx->lock, flags);
-}
-
-static void veth_handle_ack(struct veth_lpevent *event)
-{
- HvLpIndex rlp = event->base_event.xTargetLp;
- struct veth_lpar_connection *cnx = veth_cnx[rlp];
-
- BUG_ON(! cnx);
-
- switch (event->base_event.xSubtype) {
- case VETH_EVENT_CAP:
- veth_take_cap_ack(cnx, event);
- break;
- case VETH_EVENT_MONITOR:
- veth_take_monitor_ack(cnx, event);
- break;
- default:
- veth_error("Unknown ack type %d from LPAR %d.\n",
- event->base_event.xSubtype, rlp);
- }
-}
-
-static void veth_handle_int(struct veth_lpevent *event)
-{
- HvLpIndex rlp = event->base_event.xSourceLp;
- struct veth_lpar_connection *cnx = veth_cnx[rlp];
- unsigned long flags;
- int i, acked = 0;
-
- BUG_ON(! cnx);
-
- switch (event->base_event.xSubtype) {
- case VETH_EVENT_CAP:
- veth_take_cap(cnx, event);
- break;
- case VETH_EVENT_MONITOR:
- /* do nothing... this'll hang out here til we're dead,
- * and the hypervisor will return it for us. */
- break;
- case VETH_EVENT_FRAMES_ACK:
- spin_lock_irqsave(&cnx->lock, flags);
-
- for (i = 0; i < VETH_MAX_ACKS_PER_MSG; ++i) {
- u16 msgnum = event->u.frames_ack_data.token[i];
-
- if (msgnum < VETH_NUMBUFFERS) {
- veth_recycle_msg(cnx, cnx->msgs + msgnum);
- cnx->outstanding_tx--;
- acked++;
- }
- }
-
- if (acked > 0) {
- cnx->last_contact = jiffies;
- veth_wake_queues(cnx);
- }
-
- spin_unlock_irqrestore(&cnx->lock, flags);
- break;
- case VETH_EVENT_FRAMES:
- veth_receive(cnx, event);
- break;
- default:
- veth_error("Unknown interrupt type %d from LPAR %d.\n",
- event->base_event.xSubtype, rlp);
- }
-}
-
-static void veth_handle_event(struct HvLpEvent *event)
-{
- struct veth_lpevent *veth_event = (struct veth_lpevent *)event;
-
- if (hvlpevent_is_ack(event))
- veth_handle_ack(veth_event);
- else
- veth_handle_int(veth_event);
-}
-
-static int veth_process_caps(struct veth_lpar_connection *cnx)
-{
- struct veth_cap_data *remote_caps = &cnx->remote_caps;
- int num_acks_needed;
-
- /* Convert timer to jiffies */
- cnx->ack_timeout = remote_caps->ack_timeout * HZ / 1000000;
-
- if ( (remote_caps->num_buffers == 0) ||
- (remote_caps->ack_threshold > VETH_MAX_ACKS_PER_MSG) ||
- (remote_caps->ack_threshold == 0) ||
- (cnx->ack_timeout == 0) ) {
- veth_error("Received incompatible capabilities from LPAR %d.\n",
- cnx->remote_lp);
- return HvLpEvent_Rc_InvalidSubtypeData;
- }
-
- num_acks_needed = (remote_caps->num_buffers
- / remote_caps->ack_threshold) + 1;
-
- /* FIXME: locking on num_ack_events? */
- if (cnx->num_ack_events < num_acks_needed) {
- int num;
-
- num = veth_allocate_events(cnx->remote_lp,
- num_acks_needed-cnx->num_ack_events);
- if (num > 0)
- cnx->num_ack_events += num;
-
- if (cnx->num_ack_events < num_acks_needed) {
- veth_error("Couldn't allocate enough ack events "
- "for LPAR %d.\n", cnx->remote_lp);
-
- return HvLpEvent_Rc_BufferNotAvailable;
- }
- }
-
-
- return HvLpEvent_Rc_Good;
-}
-
-/* FIXME: The gotos here are a bit dubious */
-static void veth_statemachine(struct work_struct *work)
-{
- struct veth_lpar_connection *cnx =
- container_of(work, struct veth_lpar_connection,
- statemachine_wq.work);
- int rlp = cnx->remote_lp;
- int rc;
-
- spin_lock_irq(&cnx->lock);
-
- restart:
- if (cnx->state & VETH_STATE_RESET) {
- if (cnx->state & VETH_STATE_OPEN)
- HvCallEvent_closeLpEventPath(cnx->remote_lp,
- HvLpEvent_Type_VirtualLan);
-
- /*
- * Reset ack data. This prevents the ack_timer actually
- * doing anything, even if it runs one more time when
- * we drop the lock below.
- */
- memset(&cnx->pending_acks, 0xff, sizeof (cnx->pending_acks));
- cnx->num_pending_acks = 0;
-
- cnx->state &= ~(VETH_STATE_RESET | VETH_STATE_SENTMON
- | VETH_STATE_OPEN | VETH_STATE_SENTCAPS
- | VETH_STATE_GOTCAPACK | VETH_STATE_GOTCAPS
- | VETH_STATE_SENTCAPACK | VETH_STATE_READY);
-
- /* Clean up any leftover messages */
- if (cnx->msgs) {
- int i;
- for (i = 0; i < VETH_NUMBUFFERS; ++i)
- veth_recycle_msg(cnx, cnx->msgs + i);
- }
-
- cnx->outstanding_tx = 0;
- veth_wake_queues(cnx);
-
- /* Drop the lock so we can do stuff that might sleep or
- * take other locks. */
- spin_unlock_irq(&cnx->lock);
-
- del_timer_sync(&cnx->ack_timer);
- del_timer_sync(&cnx->reset_timer);
-
- spin_lock_irq(&cnx->lock);
-
- if (cnx->state & VETH_STATE_RESET)
- goto restart;
-
- /* Hack, wait for the other end to reset itself. */
- if (! (cnx->state & VETH_STATE_SHUTDOWN)) {
- schedule_delayed_work(&cnx->statemachine_wq, 5 * HZ);
- goto out;
- }
- }
-
- if (cnx->state & VETH_STATE_SHUTDOWN)
- /* It's all over, do nothing */
- goto out;
-
- if ( !(cnx->state & VETH_STATE_OPEN) ) {
- if (! cnx->msgs || (cnx->num_events < (2 + VETH_NUMBUFFERS)) )
- goto cant_cope;
-
- HvCallEvent_openLpEventPath(rlp, HvLpEvent_Type_VirtualLan);
- cnx->src_inst =
- HvCallEvent_getSourceLpInstanceId(rlp,
- HvLpEvent_Type_VirtualLan);
- cnx->dst_inst =
- HvCallEvent_getTargetLpInstanceId(rlp,
- HvLpEvent_Type_VirtualLan);
- cnx->state |= VETH_STATE_OPEN;
- }
-
- if ( (cnx->state & VETH_STATE_OPEN) &&
- !(cnx->state & VETH_STATE_SENTMON) ) {
- rc = veth_signalevent(cnx, VETH_EVENT_MONITOR,
- HvLpEvent_AckInd_DoAck,
- HvLpEvent_AckType_DeferredAck,
- 0, 0, 0, 0, 0, 0);
-
- if (rc == HvLpEvent_Rc_Good) {
- cnx->state |= VETH_STATE_SENTMON;
- } else {
- if ( (rc != HvLpEvent_Rc_PartitionDead) &&
- (rc != HvLpEvent_Rc_PathClosed) )
- veth_error("Error sending monitor to LPAR %d, "
- "rc = %d\n", rlp, rc);
-
- /* Oh well, hope we get a cap from the other
- * end and do better when that kicks us */
- goto out;
- }
- }
-
- if ( (cnx->state & VETH_STATE_OPEN) &&
- !(cnx->state & VETH_STATE_SENTCAPS)) {
- u64 *rawcap = (u64 *)&cnx->local_caps;
-
- rc = veth_signalevent(cnx, VETH_EVENT_CAP,
- HvLpEvent_AckInd_DoAck,
- HvLpEvent_AckType_ImmediateAck,
- 0, rawcap[0], rawcap[1], rawcap[2],
- rawcap[3], rawcap[4]);
-
- if (rc == HvLpEvent_Rc_Good) {
- cnx->state |= VETH_STATE_SENTCAPS;
- } else {
- if ( (rc != HvLpEvent_Rc_PartitionDead) &&
- (rc != HvLpEvent_Rc_PathClosed) )
- veth_error("Error sending caps to LPAR %d, "
- "rc = %d\n", rlp, rc);
-
- /* Oh well, hope we get a cap from the other
- * end and do better when that kicks us */
- goto out;
- }
- }
-
- if ((cnx->state & VETH_STATE_GOTCAPS) &&
- !(cnx->state & VETH_STATE_SENTCAPACK)) {
- struct veth_cap_data *remote_caps = &cnx->remote_caps;
-
- memcpy(remote_caps, &cnx->cap_event.u.caps_data,
- sizeof(*remote_caps));
-
- spin_unlock_irq(&cnx->lock);
- rc = veth_process_caps(cnx);
- spin_lock_irq(&cnx->lock);
-
- /* We dropped the lock, so recheck for anything which
- * might mess us up */
- if (cnx->state & (VETH_STATE_RESET|VETH_STATE_SHUTDOWN))
- goto restart;
-
- cnx->cap_event.base_event.xRc = rc;
- HvCallEvent_ackLpEvent((struct HvLpEvent *)&cnx->cap_event);
- if (rc == HvLpEvent_Rc_Good)
- cnx->state |= VETH_STATE_SENTCAPACK;
- else
- goto cant_cope;
- }
-
- if ((cnx->state & VETH_STATE_GOTCAPACK) &&
- (cnx->state & VETH_STATE_GOTCAPS) &&
- !(cnx->state & VETH_STATE_READY)) {
- if (cnx->cap_ack_event.base_event.xRc == HvLpEvent_Rc_Good) {
- /* Start the ACK timer */
- cnx->ack_timer.expires = jiffies + cnx->ack_timeout;
- add_timer(&cnx->ack_timer);
- cnx->state |= VETH_STATE_READY;
- } else {
- veth_error("Caps rejected by LPAR %d, rc = %d\n",
- rlp, cnx->cap_ack_event.base_event.xRc);
- goto cant_cope;
- }
- }
-
- out:
- spin_unlock_irq(&cnx->lock);
- return;
-
- cant_cope:
- /* FIXME: we get here if something happens we really can't
- * cope with. The link will never work once we get here, and
- * all we can do is not lock the rest of the system up */
- veth_error("Unrecoverable error on connection to LPAR %d, shutting down"
- " (state = 0x%04lx)\n", rlp, cnx->state);
- cnx->state |= VETH_STATE_SHUTDOWN;
- spin_unlock_irq(&cnx->lock);
-}
-
-static int veth_init_connection(u8 rlp)
-{
- struct veth_lpar_connection *cnx;
- struct veth_msg *msgs;
- int i;
-
- if ( (rlp == this_lp) ||
- ! HvLpConfig_doLpsCommunicateOnVirtualLan(this_lp, rlp) )
- return 0;
-
- cnx = kzalloc(sizeof(*cnx), GFP_KERNEL);
- if (! cnx)
- return -ENOMEM;
-
- cnx->remote_lp = rlp;
- spin_lock_init(&cnx->lock);
- INIT_DELAYED_WORK(&cnx->statemachine_wq, veth_statemachine);
-
- init_timer(&cnx->ack_timer);
- cnx->ack_timer.function = veth_timed_ack;
- cnx->ack_timer.data = (unsigned long) cnx;
-
- init_timer(&cnx->reset_timer);
- cnx->reset_timer.function = veth_timed_reset;
- cnx->reset_timer.data = (unsigned long) cnx;
- cnx->reset_timeout = 5 * HZ * (VETH_ACKTIMEOUT / 1000000);
-
- memset(&cnx->pending_acks, 0xff, sizeof (cnx->pending_acks));
-
- veth_cnx[rlp] = cnx;
-
- /* This gets us 1 reference, which is held on behalf of the driver
- * infrastructure. It's released at module unload. */
- kobject_init(&cnx->kobject, &veth_lpar_connection_ktype);
-
- msgs = kcalloc(VETH_NUMBUFFERS, sizeof(struct veth_msg), GFP_KERNEL);
- if (! msgs) {
- veth_error("Can't allocate buffers for LPAR %d.\n", rlp);
- return -ENOMEM;
- }
-
- cnx->msgs = msgs;
-
- for (i = 0; i < VETH_NUMBUFFERS; i++) {
- msgs[i].token = i;
- veth_stack_push(cnx, msgs + i);
- }
-
- cnx->num_events = veth_allocate_events(rlp, 2 + VETH_NUMBUFFERS);
-
- if (cnx->num_events < (2 + VETH_NUMBUFFERS)) {
- veth_error("Can't allocate enough events for LPAR %d.\n", rlp);
- return -ENOMEM;
- }
-
- cnx->local_caps.num_buffers = VETH_NUMBUFFERS;
- cnx->local_caps.ack_threshold = ACK_THRESHOLD;
- cnx->local_caps.ack_timeout = VETH_ACKTIMEOUT;
-
- return 0;
-}
-
-static void veth_stop_connection(struct veth_lpar_connection *cnx)
-{
- if (!cnx)
- return;
-
- spin_lock_irq(&cnx->lock);
- cnx->state |= VETH_STATE_RESET | VETH_STATE_SHUTDOWN;
- veth_kick_statemachine(cnx);
- spin_unlock_irq(&cnx->lock);
-
- /* ensure the statemachine runs now and waits for its completion */
- flush_delayed_work_sync(&cnx->statemachine_wq);
-}
-
-static void veth_destroy_connection(struct veth_lpar_connection *cnx)
-{
- if (!cnx)
- return;
-
- if (cnx->num_events > 0)
- mf_deallocate_lp_events(cnx->remote_lp,
- HvLpEvent_Type_VirtualLan,
- cnx->num_events,
- NULL, NULL);
- if (cnx->num_ack_events > 0)
- mf_deallocate_lp_events(cnx->remote_lp,
- HvLpEvent_Type_VirtualLan,
- cnx->num_ack_events,
- NULL, NULL);
-
- kfree(cnx->msgs);
- veth_cnx[cnx->remote_lp] = NULL;
- kfree(cnx);
-}
-
-static void veth_release_connection(struct kobject *kobj)
-{
- struct veth_lpar_connection *cnx;
- cnx = container_of(kobj, struct veth_lpar_connection, kobject);
- veth_stop_connection(cnx);
- veth_destroy_connection(cnx);
-}
-
-/*
- * net_device code
- */
-
-static int veth_open(struct net_device *dev)
-{
- netif_start_queue(dev);
- return 0;
-}
-
-static int veth_close(struct net_device *dev)
-{
- netif_stop_queue(dev);
- return 0;
-}
-
-static int veth_change_mtu(struct net_device *dev, int new_mtu)
-{
- if ((new_mtu < 68) || (new_mtu > VETH_MAX_MTU))
- return -EINVAL;
- dev->mtu = new_mtu;
- return 0;
-}
-
-static void veth_set_multicast_list(struct net_device *dev)
-{
- struct veth_port *port = netdev_priv(dev);
- unsigned long flags;
-
- write_lock_irqsave(&port->mcast_gate, flags);
-
- if ((dev->flags & IFF_PROMISC) || (dev->flags & IFF_ALLMULTI) ||
- (netdev_mc_count(dev) > VETH_MAX_MCAST)) {
- port->promiscuous = 1;
- } else {
- struct netdev_hw_addr *ha;
-
- port->promiscuous = 0;
-
- /* Update table */
- port->num_mcast = 0;
-
- netdev_for_each_mc_addr(ha, dev) {
- u8 *addr = ha->addr;
- u64 xaddr = 0;
-
- memcpy(&xaddr, addr, ETH_ALEN);
- port->mcast_addr[port->num_mcast] = xaddr;
- port->num_mcast++;
- }
- }
-
- write_unlock_irqrestore(&port->mcast_gate, flags);
-}
-
-static void veth_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info)
-{
- strncpy(info->driver, DRV_NAME, sizeof(info->driver) - 1);
- info->driver[sizeof(info->driver) - 1] = '\0';
- strncpy(info->version, DRV_VERSION, sizeof(info->version) - 1);
- info->version[sizeof(info->version) - 1] = '\0';
-}
-
-static int veth_get_settings(struct net_device *dev, struct ethtool_cmd *ecmd)
-{
- ecmd->supported = (SUPPORTED_1000baseT_Full
- | SUPPORTED_Autoneg | SUPPORTED_FIBRE);
- ecmd->advertising = (SUPPORTED_1000baseT_Full
- | SUPPORTED_Autoneg | SUPPORTED_FIBRE);
- ecmd->port = PORT_FIBRE;
- ecmd->transceiver = XCVR_INTERNAL;
- ecmd->phy_address = 0;
- ecmd->speed = SPEED_1000;
- ecmd->duplex = DUPLEX_FULL;
- ecmd->autoneg = AUTONEG_ENABLE;
- ecmd->maxtxpkt = 120;
- ecmd->maxrxpkt = 120;
- return 0;
-}
-
-static const struct ethtool_ops ops = {
- .get_drvinfo = veth_get_drvinfo,
- .get_settings = veth_get_settings,
- .get_link = ethtool_op_get_link,
-};
-
-static const struct net_device_ops veth_netdev_ops = {
- .ndo_open = veth_open,
- .ndo_stop = veth_close,
- .ndo_start_xmit = veth_start_xmit,
- .ndo_change_mtu = veth_change_mtu,
- .ndo_set_rx_mode = veth_set_multicast_list,
- .ndo_set_mac_address = NULL,
- .ndo_validate_addr = eth_validate_addr,
-};
-
-static struct net_device *veth_probe_one(int vlan,
- struct vio_dev *vio_dev)
-{
- struct net_device *dev;
- struct veth_port *port;
- struct device *vdev = &vio_dev->dev;
- int i, rc;
- const unsigned char *mac_addr;
-
- mac_addr = vio_get_attribute(vio_dev, "local-mac-address", NULL);
- if (mac_addr == NULL)
- mac_addr = vio_get_attribute(vio_dev, "mac-address", NULL);
- if (mac_addr == NULL) {
- veth_error("Unable to fetch MAC address from device tree.\n");
- return NULL;
- }
-
- dev = alloc_etherdev(sizeof (struct veth_port));
- if (!dev)
- return NULL;
-
- port = netdev_priv(dev);
-
- spin_lock_init(&port->queue_lock);
- rwlock_init(&port->mcast_gate);
- port->stopped_map = 0;
-
- for (i = 0; i < HVMAXARCHITECTEDLPS; i++) {
- HvLpVirtualLanIndexMap map;
-
- if (i == this_lp)
- continue;
- map = HvLpConfig_getVirtualLanIndexMapForLp(i);
- if (map & (0x8000 >> vlan))
- port->lpar_map |= (1 << i);
- }
- port->dev = vdev;
-
- memcpy(dev->dev_addr, mac_addr, ETH_ALEN);
-
- dev->mtu = VETH_MAX_MTU;
-
- memcpy(&port->mac_addr, mac_addr, ETH_ALEN);
-
- dev->netdev_ops = &veth_netdev_ops;
- SET_ETHTOOL_OPS(dev, &ops);
-
- SET_NETDEV_DEV(dev, vdev);
-
- rc = register_netdev(dev);
- if (rc != 0) {
- veth_error("Failed registering net device for vlan%d.\n", vlan);
- free_netdev(dev);
- return NULL;
- }
-
- kobject_init(&port->kobject, &veth_port_ktype);
- if (0 != kobject_add(&port->kobject, &dev->dev.kobj, "veth_port"))
- veth_error("Failed adding port for %s to sysfs.\n", dev->name);
-
- veth_info("%s attached to iSeries vlan %d (LPAR map = 0x%.4X)\n",
- dev->name, vlan, port->lpar_map);
-
- return dev;
-}
-
-/*
- * Tx path
- */
-
-static int veth_transmit_to_one(struct sk_buff *skb, HvLpIndex rlp,
- struct net_device *dev)
-{
- struct veth_lpar_connection *cnx = veth_cnx[rlp];
- struct veth_port *port = netdev_priv(dev);
- HvLpEvent_Rc rc;
- struct veth_msg *msg = NULL;
- unsigned long flags;
-
- if (! cnx)
- return 0;
-
- spin_lock_irqsave(&cnx->lock, flags);
-
- if (! (cnx->state & VETH_STATE_READY))
- goto no_error;
-
- if ((skb->len - ETH_HLEN) > VETH_MAX_MTU)
- goto drop;
-
- msg = veth_stack_pop(cnx);
- if (! msg)
- goto drop;
-
- msg->in_use = 1;
- msg->skb = skb_get(skb);
-
- msg->data.addr[0] = dma_map_single(port->dev, skb->data,
- skb->len, DMA_TO_DEVICE);
-
- if (dma_mapping_error(port->dev, msg->data.addr[0]))
- goto recycle_and_drop;
-
- msg->dev = port->dev;
- msg->data.len[0] = skb->len;
- msg->data.eofmask = 1 << VETH_EOF_SHIFT;
-
- rc = veth_signaldata(cnx, VETH_EVENT_FRAMES, msg->token, &msg->data);
-
- if (rc != HvLpEvent_Rc_Good)
- goto recycle_and_drop;
-
- /* If the timer's not already running, start it now. */
- if (0 == cnx->outstanding_tx)
- mod_timer(&cnx->reset_timer, jiffies + cnx->reset_timeout);
-
- cnx->last_contact = jiffies;
- cnx->outstanding_tx++;
-
- if (veth_stack_is_empty(cnx))
- veth_stop_queues(cnx);
-
- no_error:
- spin_unlock_irqrestore(&cnx->lock, flags);
- return 0;
-
- recycle_and_drop:
- veth_recycle_msg(cnx, msg);
- drop:
- spin_unlock_irqrestore(&cnx->lock, flags);
- return 1;
-}
-
-static void veth_transmit_to_many(struct sk_buff *skb,
- HvLpIndexMap lpmask,
- struct net_device *dev)
-{
- int i, success, error;
-
- success = error = 0;
-
- for (i = 0; i < HVMAXARCHITECTEDLPS; i++) {
- if ((lpmask & (1 << i)) == 0)
- continue;
-
- if (veth_transmit_to_one(skb, i, dev))
- error = 1;
- else
- success = 1;
- }
-
- if (error)
- dev->stats.tx_errors++;
-
- if (success) {
- dev->stats.tx_packets++;
- dev->stats.tx_bytes += skb->len;
- }
-}
-
-static int veth_start_xmit(struct sk_buff *skb, struct net_device *dev)
-{
- unsigned char *frame = skb->data;
- struct veth_port *port = netdev_priv(dev);
- HvLpIndexMap lpmask;
-
- if (is_unicast_ether_addr(frame)) {
- /* unicast packet */
- HvLpIndex rlp = frame[5];
-
- if ( ! ((1 << rlp) & port->lpar_map) ) {
- dev_kfree_skb(skb);
- return NETDEV_TX_OK;
- }
-
- lpmask = 1 << rlp;
- } else {
- lpmask = port->lpar_map;
- }
-
- veth_transmit_to_many(skb, lpmask, dev);
-
- dev_kfree_skb(skb);
-
- return NETDEV_TX_OK;
-}
-
-/* You must hold the connection's lock when you call this function. */
-static void veth_recycle_msg(struct veth_lpar_connection *cnx,
- struct veth_msg *msg)
-{
- u32 dma_address, dma_length;
-
- if (msg->in_use) {
- msg->in_use = 0;
- dma_address = msg->data.addr[0];
- dma_length = msg->data.len[0];
-
- if (!dma_mapping_error(msg->dev, dma_address))
- dma_unmap_single(msg->dev, dma_address, dma_length,
- DMA_TO_DEVICE);
-
- if (msg->skb) {
- dev_kfree_skb_any(msg->skb);
- msg->skb = NULL;
- }
-
- memset(&msg->data, 0, sizeof(msg->data));
- veth_stack_push(cnx, msg);
- } else if (cnx->state & VETH_STATE_OPEN) {
- veth_error("Non-pending frame (# %d) acked by LPAR %d.\n",
- cnx->remote_lp, msg->token);
- }
-}
-
-static void veth_wake_queues(struct veth_lpar_connection *cnx)
-{
- int i;
-
- for (i = 0; i < HVMAXARCHITECTEDVIRTUALLANS; i++) {
- struct net_device *dev = veth_dev[i];
- struct veth_port *port;
- unsigned long flags;
-
- if (! dev)
- continue;
-
- port = netdev_priv(dev);
-
- if (! (port->lpar_map & (1<<cnx->remote_lp)))
- continue;
-
- spin_lock_irqsave(&port->queue_lock, flags);
-
- port->stopped_map &= ~(1 << cnx->remote_lp);
-
- if (0 == port->stopped_map && netif_queue_stopped(dev)) {
- veth_debug("cnx %d: woke queue for %s.\n",
- cnx->remote_lp, dev->name);
- netif_wake_queue(dev);
- }
- spin_unlock_irqrestore(&port->queue_lock, flags);
- }
-}
-
-static void veth_stop_queues(struct veth_lpar_connection *cnx)
-{
- int i;
-
- for (i = 0; i < HVMAXARCHITECTEDVIRTUALLANS; i++) {
- struct net_device *dev = veth_dev[i];
- struct veth_port *port;
-
- if (! dev)
- continue;
-
- port = netdev_priv(dev);
-
- /* If this cnx is not on the vlan for this port, continue */
- if (! (port->lpar_map & (1 << cnx->remote_lp)))
- continue;
-
- spin_lock(&port->queue_lock);
-
- netif_stop_queue(dev);
- port->stopped_map |= (1 << cnx->remote_lp);
-
- veth_debug("cnx %d: stopped queue for %s, map = 0x%x.\n",
- cnx->remote_lp, dev->name, port->stopped_map);
-
- spin_unlock(&port->queue_lock);
- }
-}
-
-static void veth_timed_reset(unsigned long ptr)
-{
- struct veth_lpar_connection *cnx = (struct veth_lpar_connection *)ptr;
- unsigned long trigger_time, flags;
-
- /* FIXME is it possible this fires after veth_stop_connection()?
- * That would reschedule the statemachine for 5 seconds and probably
- * execute it after the module's been unloaded. Hmm. */
-
- spin_lock_irqsave(&cnx->lock, flags);
-
- if (cnx->outstanding_tx > 0) {
- trigger_time = cnx->last_contact + cnx->reset_timeout;
-
- if (trigger_time < jiffies) {
- cnx->state |= VETH_STATE_RESET;
- veth_kick_statemachine(cnx);
- veth_error("%d packets not acked by LPAR %d within %d "
- "seconds, resetting.\n",
- cnx->outstanding_tx, cnx->remote_lp,
- cnx->reset_timeout / HZ);
- } else {
- /* Reschedule the timer */
- trigger_time = jiffies + cnx->reset_timeout;
- mod_timer(&cnx->reset_timer, trigger_time);
- }
- }
-
- spin_unlock_irqrestore(&cnx->lock, flags);
-}
-
-/*
- * Rx path
- */
-
-static inline int veth_frame_wanted(struct veth_port *port, u64 mac_addr)
-{
- int wanted = 0;
- int i;
- unsigned long flags;
-
- if ( (mac_addr == port->mac_addr) || (mac_addr == 0xffffffffffff0000) )
- return 1;
-
- read_lock_irqsave(&port->mcast_gate, flags);
-
- if (port->promiscuous) {
- wanted = 1;
- goto out;
- }
-
- for (i = 0; i < port->num_mcast; ++i) {
- if (port->mcast_addr[i] == mac_addr) {
- wanted = 1;
- break;
- }
- }
-
- out:
- read_unlock_irqrestore(&port->mcast_gate, flags);
-
- return wanted;
-}
-
-struct dma_chunk {
- u64 addr;
- u64 size;
-};
-
-#define VETH_MAX_PAGES_PER_FRAME ( (VETH_MAX_MTU+PAGE_SIZE-2)/PAGE_SIZE + 1 )
-
-static inline void veth_build_dma_list(struct dma_chunk *list,
- unsigned char *p, unsigned long length)
-{
- unsigned long done;
- int i = 1;
-
- /* FIXME: skbs are contiguous in real addresses. Do we
- * really need to break it into PAGE_SIZE chunks, or can we do
- * it just at the granularity of iSeries real->absolute
- * mapping? Indeed, given the way the allocator works, can we
- * count on them being absolutely contiguous? */
- list[0].addr = iseries_hv_addr(p);
- list[0].size = min(length,
- PAGE_SIZE - ((unsigned long)p & ~PAGE_MASK));
-
- done = list[0].size;
- while (done < length) {
- list[i].addr = iseries_hv_addr(p + done);
- list[i].size = min(length-done, PAGE_SIZE);
- done += list[i].size;
- i++;
- }
-}
-
-static void veth_flush_acks(struct veth_lpar_connection *cnx)
-{
- HvLpEvent_Rc rc;
-
- rc = veth_signaldata(cnx, VETH_EVENT_FRAMES_ACK,
- 0, &cnx->pending_acks);
-
- if (rc != HvLpEvent_Rc_Good)
- veth_error("Failed acking frames from LPAR %d, rc = %d\n",
- cnx->remote_lp, (int)rc);
-
- cnx->num_pending_acks = 0;
- memset(&cnx->pending_acks, 0xff, sizeof(cnx->pending_acks));
-}
-
-static void veth_receive(struct veth_lpar_connection *cnx,
- struct veth_lpevent *event)
-{
- struct veth_frames_data *senddata = &event->u.frames_data;
- int startchunk = 0;
- int nchunks;
- unsigned long flags;
- HvLpDma_Rc rc;
-
- do {
- u16 length = 0;
- struct sk_buff *skb;
- struct dma_chunk local_list[VETH_MAX_PAGES_PER_FRAME];
- struct dma_chunk remote_list[VETH_MAX_FRAMES_PER_MSG];
- u64 dest;
- HvLpVirtualLanIndex vlan;
- struct net_device *dev;
- struct veth_port *port;
-
- /* FIXME: do we need this? */
- memset(local_list, 0, sizeof(local_list));
- memset(remote_list, 0, sizeof(remote_list));
-
- /* a 0 address marks the end of the valid entries */
- if (senddata->addr[startchunk] == 0)
- break;
-
- /* make sure that we have at least 1 EOF entry in the
- * remaining entries */
- if (! (senddata->eofmask >> (startchunk + VETH_EOF_SHIFT))) {
- veth_error("Missing EOF fragment in event "
- "eofmask = 0x%x startchunk = %d\n",
- (unsigned)senddata->eofmask,
- startchunk);
- break;
- }
-
- /* build list of chunks in this frame */
- nchunks = 0;
- do {
- remote_list[nchunks].addr =
- (u64) senddata->addr[startchunk+nchunks] << 32;
- remote_list[nchunks].size =
- senddata->len[startchunk+nchunks];
- length += remote_list[nchunks].size;
- } while (! (senddata->eofmask &
- (1 << (VETH_EOF_SHIFT + startchunk + nchunks++))));
-
- /* length == total length of all chunks */
- /* nchunks == # of chunks in this frame */
-
- if ((length - ETH_HLEN) > VETH_MAX_MTU) {
- veth_error("Received oversize frame from LPAR %d "
- "(length = %d)\n",
- cnx->remote_lp, length);
- continue;
- }
-
- skb = alloc_skb(length, GFP_ATOMIC);
- if (!skb)
- continue;
-
- veth_build_dma_list(local_list, skb->data, length);
-
- rc = HvCallEvent_dmaBufList(HvLpEvent_Type_VirtualLan,
- event->base_event.xSourceLp,
- HvLpDma_Direction_RemoteToLocal,
- cnx->src_inst,
- cnx->dst_inst,
- HvLpDma_AddressType_RealAddress,
- HvLpDma_AddressType_TceIndex,
- iseries_hv_addr(&local_list),
- iseries_hv_addr(&remote_list),
- length);
- if (rc != HvLpDma_Rc_Good) {
- dev_kfree_skb_irq(skb);
- continue;
- }
-
- vlan = skb->data[9];
- dev = veth_dev[vlan];
- if (! dev) {
- /*
- * Some earlier versions of the driver sent
- * broadcasts down all connections, even to lpars
- * that weren't on the relevant vlan. So ignore
- * packets belonging to a vlan we're not on.
- * We can also be here if we receive packets while
- * the driver is going down, because then dev is NULL.
- */
- dev_kfree_skb_irq(skb);
- continue;
- }
-
- port = netdev_priv(dev);
- dest = *((u64 *) skb->data) & 0xFFFFFFFFFFFF0000;
-
- if ((vlan > HVMAXARCHITECTEDVIRTUALLANS) || !port) {
- dev_kfree_skb_irq(skb);
- continue;
- }
- if (! veth_frame_wanted(port, dest)) {
- dev_kfree_skb_irq(skb);
- continue;
- }
-
- skb_put(skb, length);
- skb->protocol = eth_type_trans(skb, dev);
- skb_checksum_none_assert(skb);
- netif_rx(skb); /* send it up */
- dev->stats.rx_packets++;
- dev->stats.rx_bytes += length;
- } while (startchunk += nchunks, startchunk < VETH_MAX_FRAMES_PER_MSG);
-
- /* Ack it */
- spin_lock_irqsave(&cnx->lock, flags);
- BUG_ON(cnx->num_pending_acks > VETH_MAX_ACKS_PER_MSG);
-
- cnx->pending_acks[cnx->num_pending_acks++] =
- event->base_event.xCorrelationToken;
-
- if ( (cnx->num_pending_acks >= cnx->remote_caps.ack_threshold) ||
- (cnx->num_pending_acks >= VETH_MAX_ACKS_PER_MSG) )
- veth_flush_acks(cnx);
-
- spin_unlock_irqrestore(&cnx->lock, flags);
-}
-
-static void veth_timed_ack(unsigned long ptr)
-{
- struct veth_lpar_connection *cnx = (struct veth_lpar_connection *) ptr;
- unsigned long flags;
-
- /* Ack all the events */
- spin_lock_irqsave(&cnx->lock, flags);
- if (cnx->num_pending_acks > 0)
- veth_flush_acks(cnx);
-
- /* Reschedule the timer */
- cnx->ack_timer.expires = jiffies + cnx->ack_timeout;
- add_timer(&cnx->ack_timer);
- spin_unlock_irqrestore(&cnx->lock, flags);
-}
-
-static int veth_remove(struct vio_dev *vdev)
-{
- struct veth_lpar_connection *cnx;
- struct net_device *dev;
- struct veth_port *port;
- int i;
-
- dev = veth_dev[vdev->unit_address];
-
- if (! dev)
- return 0;
-
- port = netdev_priv(dev);
-
- for (i = 0; i < HVMAXARCHITECTEDLPS; i++) {
- cnx = veth_cnx[i];
-
- if (cnx && (port->lpar_map & (1 << i))) {
- /* Drop our reference to connections on our VLAN */
- kobject_put(&cnx->kobject);
- }
- }
-
- veth_dev[vdev->unit_address] = NULL;
- kobject_del(&port->kobject);
- kobject_put(&port->kobject);
- unregister_netdev(dev);
- free_netdev(dev);
-
- return 0;
-}
-
-static int veth_probe(struct vio_dev *vdev, const struct vio_device_id *id)
-{
- int i = vdev->unit_address;
- struct net_device *dev;
- struct veth_port *port;
-
- dev = veth_probe_one(i, vdev);
- if (dev == NULL) {
- veth_remove(vdev);
- return 1;
- }
- veth_dev[i] = dev;
-
- port = netdev_priv(dev);
-
- /* Start the state machine on each connection on this vlan. If we're
- * the first dev to do so this will commence link negotiation */
- for (i = 0; i < HVMAXARCHITECTEDLPS; i++) {
- struct veth_lpar_connection *cnx;
-
- if (! (port->lpar_map & (1 << i)))
- continue;
-
- cnx = veth_cnx[i];
- if (!cnx)
- continue;
-
- kobject_get(&cnx->kobject);
- veth_kick_statemachine(cnx);
- }
-
- return 0;
-}
-
-/**
- * veth_device_table: Used by vio.c to match devices that we
- * support.
- */
-static struct vio_device_id veth_device_table[] __devinitdata = {
- { "network", "IBM,iSeries-l-lan" },
- { "", "" }
-};
-MODULE_DEVICE_TABLE(vio, veth_device_table);
-
-static struct vio_driver veth_driver = {
- .id_table = veth_device_table,
- .probe = veth_probe,
- .remove = veth_remove,
- .driver = {
- .name = DRV_NAME,
- .owner = THIS_MODULE,
- }
-};
-
-/*
- * Module initialization/cleanup
- */
-
-static void __exit veth_module_cleanup(void)
-{
- int i;
- struct veth_lpar_connection *cnx;
-
- /* Disconnect our "irq" to stop events coming from the Hypervisor. */
- HvLpEvent_unregisterHandler(HvLpEvent_Type_VirtualLan);
-
- for (i = 0; i < HVMAXARCHITECTEDLPS; ++i) {
- cnx = veth_cnx[i];
-
- if (!cnx)
- continue;
-
- /* Cancel work queued from Hypervisor callbacks */
- cancel_delayed_work_sync(&cnx->statemachine_wq);
- /* Remove the connection from sysfs */
- kobject_del(&cnx->kobject);
- /* Drop the driver's reference to the connection */
- kobject_put(&cnx->kobject);
- }
-
- /* Unregister the driver, which will close all the netdevs and stop
- * the connections when they're no longer referenced. */
- vio_unregister_driver(&veth_driver);
-}
-module_exit(veth_module_cleanup);
-
-static int __init veth_module_init(void)
-{
- int i;
- int rc;
-
- if (!firmware_has_feature(FW_FEATURE_ISERIES))
- return -ENODEV;
-
- this_lp = HvLpConfig_getLpIndex_outline();
-
- for (i = 0; i < HVMAXARCHITECTEDLPS; ++i) {
- rc = veth_init_connection(i);
- if (rc != 0)
- goto error;
- }
-
- HvLpEvent_registerHandler(HvLpEvent_Type_VirtualLan,
- &veth_handle_event);
-
- rc = vio_register_driver(&veth_driver);
- if (rc != 0)
- goto error;
-
- for (i = 0; i < HVMAXARCHITECTEDLPS; ++i) {
- struct kobject *kobj;
-
- if (!veth_cnx[i])
- continue;
-
- kobj = &veth_cnx[i]->kobject;
- /* If the add failes, complain but otherwise continue */
- if (0 != driver_add_kobj(&veth_driver.driver, kobj,
- "cnx%.2d", veth_cnx[i]->remote_lp))
- veth_error("cnx %d: Failed adding to sysfs.\n", i);
- }
-
- return 0;
-
-error:
- for (i = 0; i < HVMAXARCHITECTEDLPS; ++i) {
- veth_destroy_connection(veth_cnx[i]);
- }
-
- return rc;
-}
-module_init(veth_module_init);
projects / karo-tx-linux.git / commitdiff