mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-22 00:40:03 +00:00
![Juergen Gross](/assets/img/avatar_default.png)
Commit57f230ab04
("xen/netfront: raise max number of slots in xennet_get_responses()") raised the max number of allowed slots by one. This seems to be problematic in some configurations with netback using a larger MAX_SKB_FRAGS value (e.g. old Linux kernel with MAX_SKB_FRAGS defined as 18 instead of nowadays 17). Instead of BUG_ON() in this case just fall back to retransmission. Fixes:57f230ab04
("xen/netfront: raise max number of slots in xennet_get_responses()") Cc: stable@vger.kernel.org Signed-off-by: Juergen Gross <jgross@suse.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2225 lines
55 KiB
C
2225 lines
55 KiB
C
/*
|
|
* Virtual network driver for conversing with remote driver backends.
|
|
*
|
|
* Copyright (c) 2002-2005, K A Fraser
|
|
* Copyright (c) 2005, XenSource Ltd
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License version 2
|
|
* as published by the Free Software Foundation; or, when distributed
|
|
* separately from the Linux kernel or incorporated into other
|
|
* software packages, subject to the following license:
|
|
*
|
|
* Permission is hereby granted, free of charge, to any person obtaining a copy
|
|
* of this source file (the "Software"), to deal in the Software without
|
|
* restriction, including without limitation the rights to use, copy, modify,
|
|
* merge, publish, distribute, sublicense, and/or sell copies of the Software,
|
|
* and to permit persons to whom the Software is furnished to do so, subject to
|
|
* the following conditions:
|
|
*
|
|
* The above copyright notice and this permission notice shall be included in
|
|
* all copies or substantial portions of the Software.
|
|
*
|
|
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
|
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
|
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
|
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
|
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
|
|
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
|
|
* IN THE SOFTWARE.
|
|
*/
|
|
|
|
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
|
|
|
|
#include <linux/module.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/netdevice.h>
|
|
#include <linux/etherdevice.h>
|
|
#include <linux/skbuff.h>
|
|
#include <linux/ethtool.h>
|
|
#include <linux/if_ether.h>
|
|
#include <net/tcp.h>
|
|
#include <linux/udp.h>
|
|
#include <linux/moduleparam.h>
|
|
#include <linux/mm.h>
|
|
#include <linux/slab.h>
|
|
#include <net/ip.h>
|
|
|
|
#include <xen/xen.h>
|
|
#include <xen/xenbus.h>
|
|
#include <xen/events.h>
|
|
#include <xen/page.h>
|
|
#include <xen/platform_pci.h>
|
|
#include <xen/grant_table.h>
|
|
|
|
#include <xen/interface/io/netif.h>
|
|
#include <xen/interface/memory.h>
|
|
#include <xen/interface/grant_table.h>
|
|
|
|
/* Module parameters */
|
|
#define MAX_QUEUES_DEFAULT 8
|
|
static unsigned int xennet_max_queues;
|
|
module_param_named(max_queues, xennet_max_queues, uint, 0644);
|
|
MODULE_PARM_DESC(max_queues,
|
|
"Maximum number of queues per virtual interface");
|
|
|
|
static const struct ethtool_ops xennet_ethtool_ops;
|
|
|
|
struct netfront_cb {
|
|
int pull_to;
|
|
};
|
|
|
|
#define NETFRONT_SKB_CB(skb) ((struct netfront_cb *)((skb)->cb))
|
|
|
|
#define RX_COPY_THRESHOLD 256
|
|
|
|
#define GRANT_INVALID_REF 0
|
|
|
|
#define NET_TX_RING_SIZE __CONST_RING_SIZE(xen_netif_tx, XEN_PAGE_SIZE)
|
|
#define NET_RX_RING_SIZE __CONST_RING_SIZE(xen_netif_rx, XEN_PAGE_SIZE)
|
|
|
|
/* Minimum number of Rx slots (includes slot for GSO metadata). */
|
|
#define NET_RX_SLOTS_MIN (XEN_NETIF_NR_SLOTS_MIN + 1)
|
|
|
|
/* Queue name is interface name with "-qNNN" appended */
|
|
#define QUEUE_NAME_SIZE (IFNAMSIZ + 6)
|
|
|
|
/* IRQ name is queue name with "-tx" or "-rx" appended */
|
|
#define IRQ_NAME_SIZE (QUEUE_NAME_SIZE + 3)
|
|
|
|
static DECLARE_WAIT_QUEUE_HEAD(module_wq);
|
|
|
|
struct netfront_stats {
|
|
u64 packets;
|
|
u64 bytes;
|
|
struct u64_stats_sync syncp;
|
|
};
|
|
|
|
struct netfront_info;
|
|
|
|
struct netfront_queue {
|
|
unsigned int id; /* Queue ID, 0-based */
|
|
char name[QUEUE_NAME_SIZE]; /* DEVNAME-qN */
|
|
struct netfront_info *info;
|
|
|
|
struct napi_struct napi;
|
|
|
|
/* Split event channels support, tx_* == rx_* when using
|
|
* single event channel.
|
|
*/
|
|
unsigned int tx_evtchn, rx_evtchn;
|
|
unsigned int tx_irq, rx_irq;
|
|
/* Only used when split event channels support is enabled */
|
|
char tx_irq_name[IRQ_NAME_SIZE]; /* DEVNAME-qN-tx */
|
|
char rx_irq_name[IRQ_NAME_SIZE]; /* DEVNAME-qN-rx */
|
|
|
|
spinlock_t tx_lock;
|
|
struct xen_netif_tx_front_ring tx;
|
|
int tx_ring_ref;
|
|
|
|
/*
|
|
* {tx,rx}_skbs store outstanding skbuffs. Free tx_skb entries
|
|
* are linked from tx_skb_freelist through skb_entry.link.
|
|
*
|
|
* NB. Freelist index entries are always going to be less than
|
|
* PAGE_OFFSET, whereas pointers to skbs will always be equal or
|
|
* greater than PAGE_OFFSET: we use this property to distinguish
|
|
* them.
|
|
*/
|
|
union skb_entry {
|
|
struct sk_buff *skb;
|
|
unsigned long link;
|
|
} tx_skbs[NET_TX_RING_SIZE];
|
|
grant_ref_t gref_tx_head;
|
|
grant_ref_t grant_tx_ref[NET_TX_RING_SIZE];
|
|
struct page *grant_tx_page[NET_TX_RING_SIZE];
|
|
unsigned tx_skb_freelist;
|
|
|
|
spinlock_t rx_lock ____cacheline_aligned_in_smp;
|
|
struct xen_netif_rx_front_ring rx;
|
|
int rx_ring_ref;
|
|
|
|
struct timer_list rx_refill_timer;
|
|
|
|
struct sk_buff *rx_skbs[NET_RX_RING_SIZE];
|
|
grant_ref_t gref_rx_head;
|
|
grant_ref_t grant_rx_ref[NET_RX_RING_SIZE];
|
|
};
|
|
|
|
struct netfront_info {
|
|
struct list_head list;
|
|
struct net_device *netdev;
|
|
|
|
struct xenbus_device *xbdev;
|
|
|
|
/* Multi-queue support */
|
|
struct netfront_queue *queues;
|
|
|
|
/* Statistics */
|
|
struct netfront_stats __percpu *rx_stats;
|
|
struct netfront_stats __percpu *tx_stats;
|
|
|
|
atomic_t rx_gso_checksum_fixup;
|
|
};
|
|
|
|
struct netfront_rx_info {
|
|
struct xen_netif_rx_response rx;
|
|
struct xen_netif_extra_info extras[XEN_NETIF_EXTRA_TYPE_MAX - 1];
|
|
};
|
|
|
|
static void skb_entry_set_link(union skb_entry *list, unsigned short id)
|
|
{
|
|
list->link = id;
|
|
}
|
|
|
|
static int skb_entry_is_link(const union skb_entry *list)
|
|
{
|
|
BUILD_BUG_ON(sizeof(list->skb) != sizeof(list->link));
|
|
return (unsigned long)list->skb < PAGE_OFFSET;
|
|
}
|
|
|
|
/*
|
|
* Access macros for acquiring freeing slots in tx_skbs[].
|
|
*/
|
|
|
|
static void add_id_to_freelist(unsigned *head, union skb_entry *list,
|
|
unsigned short id)
|
|
{
|
|
skb_entry_set_link(&list[id], *head);
|
|
*head = id;
|
|
}
|
|
|
|
static unsigned short get_id_from_freelist(unsigned *head,
|
|
union skb_entry *list)
|
|
{
|
|
unsigned int id = *head;
|
|
*head = list[id].link;
|
|
return id;
|
|
}
|
|
|
|
static int xennet_rxidx(RING_IDX idx)
|
|
{
|
|
return idx & (NET_RX_RING_SIZE - 1);
|
|
}
|
|
|
|
static struct sk_buff *xennet_get_rx_skb(struct netfront_queue *queue,
|
|
RING_IDX ri)
|
|
{
|
|
int i = xennet_rxidx(ri);
|
|
struct sk_buff *skb = queue->rx_skbs[i];
|
|
queue->rx_skbs[i] = NULL;
|
|
return skb;
|
|
}
|
|
|
|
static grant_ref_t xennet_get_rx_ref(struct netfront_queue *queue,
|
|
RING_IDX ri)
|
|
{
|
|
int i = xennet_rxidx(ri);
|
|
grant_ref_t ref = queue->grant_rx_ref[i];
|
|
queue->grant_rx_ref[i] = GRANT_INVALID_REF;
|
|
return ref;
|
|
}
|
|
|
|
#ifdef CONFIG_SYSFS
|
|
static const struct attribute_group xennet_dev_group;
|
|
#endif
|
|
|
|
static bool xennet_can_sg(struct net_device *dev)
|
|
{
|
|
return dev->features & NETIF_F_SG;
|
|
}
|
|
|
|
|
|
static void rx_refill_timeout(struct timer_list *t)
|
|
{
|
|
struct netfront_queue *queue = from_timer(queue, t, rx_refill_timer);
|
|
napi_schedule(&queue->napi);
|
|
}
|
|
|
|
static int netfront_tx_slot_available(struct netfront_queue *queue)
|
|
{
|
|
return (queue->tx.req_prod_pvt - queue->tx.rsp_cons) <
|
|
(NET_TX_RING_SIZE - XEN_NETIF_NR_SLOTS_MIN - 1);
|
|
}
|
|
|
|
static void xennet_maybe_wake_tx(struct netfront_queue *queue)
|
|
{
|
|
struct net_device *dev = queue->info->netdev;
|
|
struct netdev_queue *dev_queue = netdev_get_tx_queue(dev, queue->id);
|
|
|
|
if (unlikely(netif_tx_queue_stopped(dev_queue)) &&
|
|
netfront_tx_slot_available(queue) &&
|
|
likely(netif_running(dev)))
|
|
netif_tx_wake_queue(netdev_get_tx_queue(dev, queue->id));
|
|
}
|
|
|
|
|
|
static struct sk_buff *xennet_alloc_one_rx_buffer(struct netfront_queue *queue)
|
|
{
|
|
struct sk_buff *skb;
|
|
struct page *page;
|
|
|
|
skb = __netdev_alloc_skb(queue->info->netdev,
|
|
RX_COPY_THRESHOLD + NET_IP_ALIGN,
|
|
GFP_ATOMIC | __GFP_NOWARN);
|
|
if (unlikely(!skb))
|
|
return NULL;
|
|
|
|
page = alloc_page(GFP_ATOMIC | __GFP_NOWARN);
|
|
if (!page) {
|
|
kfree_skb(skb);
|
|
return NULL;
|
|
}
|
|
skb_add_rx_frag(skb, 0, page, 0, 0, PAGE_SIZE);
|
|
|
|
/* Align ip header to a 16 bytes boundary */
|
|
skb_reserve(skb, NET_IP_ALIGN);
|
|
skb->dev = queue->info->netdev;
|
|
|
|
return skb;
|
|
}
|
|
|
|
|
|
static void xennet_alloc_rx_buffers(struct netfront_queue *queue)
|
|
{
|
|
RING_IDX req_prod = queue->rx.req_prod_pvt;
|
|
int notify;
|
|
int err = 0;
|
|
|
|
if (unlikely(!netif_carrier_ok(queue->info->netdev)))
|
|
return;
|
|
|
|
for (req_prod = queue->rx.req_prod_pvt;
|
|
req_prod - queue->rx.rsp_cons < NET_RX_RING_SIZE;
|
|
req_prod++) {
|
|
struct sk_buff *skb;
|
|
unsigned short id;
|
|
grant_ref_t ref;
|
|
struct page *page;
|
|
struct xen_netif_rx_request *req;
|
|
|
|
skb = xennet_alloc_one_rx_buffer(queue);
|
|
if (!skb) {
|
|
err = -ENOMEM;
|
|
break;
|
|
}
|
|
|
|
id = xennet_rxidx(req_prod);
|
|
|
|
BUG_ON(queue->rx_skbs[id]);
|
|
queue->rx_skbs[id] = skb;
|
|
|
|
ref = gnttab_claim_grant_reference(&queue->gref_rx_head);
|
|
WARN_ON_ONCE(IS_ERR_VALUE((unsigned long)(int)ref));
|
|
queue->grant_rx_ref[id] = ref;
|
|
|
|
page = skb_frag_page(&skb_shinfo(skb)->frags[0]);
|
|
|
|
req = RING_GET_REQUEST(&queue->rx, req_prod);
|
|
gnttab_page_grant_foreign_access_ref_one(ref,
|
|
queue->info->xbdev->otherend_id,
|
|
page,
|
|
0);
|
|
req->id = id;
|
|
req->gref = ref;
|
|
}
|
|
|
|
queue->rx.req_prod_pvt = req_prod;
|
|
|
|
/* Try again later if there are not enough requests or skb allocation
|
|
* failed.
|
|
* Enough requests is quantified as the sum of newly created slots and
|
|
* the unconsumed slots at the backend.
|
|
*/
|
|
if (req_prod - queue->rx.rsp_cons < NET_RX_SLOTS_MIN ||
|
|
unlikely(err)) {
|
|
mod_timer(&queue->rx_refill_timer, jiffies + (HZ/10));
|
|
return;
|
|
}
|
|
|
|
wmb(); /* barrier so backend seens requests */
|
|
|
|
RING_PUSH_REQUESTS_AND_CHECK_NOTIFY(&queue->rx, notify);
|
|
if (notify)
|
|
notify_remote_via_irq(queue->rx_irq);
|
|
}
|
|
|
|
static int xennet_open(struct net_device *dev)
|
|
{
|
|
struct netfront_info *np = netdev_priv(dev);
|
|
unsigned int num_queues = dev->real_num_tx_queues;
|
|
unsigned int i = 0;
|
|
struct netfront_queue *queue = NULL;
|
|
|
|
if (!np->queues)
|
|
return -ENODEV;
|
|
|
|
for (i = 0; i < num_queues; ++i) {
|
|
queue = &np->queues[i];
|
|
napi_enable(&queue->napi);
|
|
|
|
spin_lock_bh(&queue->rx_lock);
|
|
if (netif_carrier_ok(dev)) {
|
|
xennet_alloc_rx_buffers(queue);
|
|
queue->rx.sring->rsp_event = queue->rx.rsp_cons + 1;
|
|
if (RING_HAS_UNCONSUMED_RESPONSES(&queue->rx))
|
|
napi_schedule(&queue->napi);
|
|
}
|
|
spin_unlock_bh(&queue->rx_lock);
|
|
}
|
|
|
|
netif_tx_start_all_queues(dev);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void xennet_tx_buf_gc(struct netfront_queue *queue)
|
|
{
|
|
RING_IDX cons, prod;
|
|
unsigned short id;
|
|
struct sk_buff *skb;
|
|
bool more_to_do;
|
|
|
|
BUG_ON(!netif_carrier_ok(queue->info->netdev));
|
|
|
|
do {
|
|
prod = queue->tx.sring->rsp_prod;
|
|
rmb(); /* Ensure we see responses up to 'rp'. */
|
|
|
|
for (cons = queue->tx.rsp_cons; cons != prod; cons++) {
|
|
struct xen_netif_tx_response *txrsp;
|
|
|
|
txrsp = RING_GET_RESPONSE(&queue->tx, cons);
|
|
if (txrsp->status == XEN_NETIF_RSP_NULL)
|
|
continue;
|
|
|
|
id = txrsp->id;
|
|
skb = queue->tx_skbs[id].skb;
|
|
if (unlikely(gnttab_query_foreign_access(
|
|
queue->grant_tx_ref[id]) != 0)) {
|
|
pr_alert("%s: warning -- grant still in use by backend domain\n",
|
|
__func__);
|
|
BUG();
|
|
}
|
|
gnttab_end_foreign_access_ref(
|
|
queue->grant_tx_ref[id], GNTMAP_readonly);
|
|
gnttab_release_grant_reference(
|
|
&queue->gref_tx_head, queue->grant_tx_ref[id]);
|
|
queue->grant_tx_ref[id] = GRANT_INVALID_REF;
|
|
queue->grant_tx_page[id] = NULL;
|
|
add_id_to_freelist(&queue->tx_skb_freelist, queue->tx_skbs, id);
|
|
dev_kfree_skb_irq(skb);
|
|
}
|
|
|
|
queue->tx.rsp_cons = prod;
|
|
|
|
RING_FINAL_CHECK_FOR_RESPONSES(&queue->tx, more_to_do);
|
|
} while (more_to_do);
|
|
|
|
xennet_maybe_wake_tx(queue);
|
|
}
|
|
|
|
struct xennet_gnttab_make_txreq {
|
|
struct netfront_queue *queue;
|
|
struct sk_buff *skb;
|
|
struct page *page;
|
|
struct xen_netif_tx_request *tx; /* Last request */
|
|
unsigned int size;
|
|
};
|
|
|
|
static void xennet_tx_setup_grant(unsigned long gfn, unsigned int offset,
|
|
unsigned int len, void *data)
|
|
{
|
|
struct xennet_gnttab_make_txreq *info = data;
|
|
unsigned int id;
|
|
struct xen_netif_tx_request *tx;
|
|
grant_ref_t ref;
|
|
/* convenient aliases */
|
|
struct page *page = info->page;
|
|
struct netfront_queue *queue = info->queue;
|
|
struct sk_buff *skb = info->skb;
|
|
|
|
id = get_id_from_freelist(&queue->tx_skb_freelist, queue->tx_skbs);
|
|
tx = RING_GET_REQUEST(&queue->tx, queue->tx.req_prod_pvt++);
|
|
ref = gnttab_claim_grant_reference(&queue->gref_tx_head);
|
|
WARN_ON_ONCE(IS_ERR_VALUE((unsigned long)(int)ref));
|
|
|
|
gnttab_grant_foreign_access_ref(ref, queue->info->xbdev->otherend_id,
|
|
gfn, GNTMAP_readonly);
|
|
|
|
queue->tx_skbs[id].skb = skb;
|
|
queue->grant_tx_page[id] = page;
|
|
queue->grant_tx_ref[id] = ref;
|
|
|
|
tx->id = id;
|
|
tx->gref = ref;
|
|
tx->offset = offset;
|
|
tx->size = len;
|
|
tx->flags = 0;
|
|
|
|
info->tx = tx;
|
|
info->size += tx->size;
|
|
}
|
|
|
|
static struct xen_netif_tx_request *xennet_make_first_txreq(
|
|
struct netfront_queue *queue, struct sk_buff *skb,
|
|
struct page *page, unsigned int offset, unsigned int len)
|
|
{
|
|
struct xennet_gnttab_make_txreq info = {
|
|
.queue = queue,
|
|
.skb = skb,
|
|
.page = page,
|
|
.size = 0,
|
|
};
|
|
|
|
gnttab_for_one_grant(page, offset, len, xennet_tx_setup_grant, &info);
|
|
|
|
return info.tx;
|
|
}
|
|
|
|
static void xennet_make_one_txreq(unsigned long gfn, unsigned int offset,
|
|
unsigned int len, void *data)
|
|
{
|
|
struct xennet_gnttab_make_txreq *info = data;
|
|
|
|
info->tx->flags |= XEN_NETTXF_more_data;
|
|
skb_get(info->skb);
|
|
xennet_tx_setup_grant(gfn, offset, len, data);
|
|
}
|
|
|
|
static struct xen_netif_tx_request *xennet_make_txreqs(
|
|
struct netfront_queue *queue, struct xen_netif_tx_request *tx,
|
|
struct sk_buff *skb, struct page *page,
|
|
unsigned int offset, unsigned int len)
|
|
{
|
|
struct xennet_gnttab_make_txreq info = {
|
|
.queue = queue,
|
|
.skb = skb,
|
|
.tx = tx,
|
|
};
|
|
|
|
/* Skip unused frames from start of page */
|
|
page += offset >> PAGE_SHIFT;
|
|
offset &= ~PAGE_MASK;
|
|
|
|
while (len) {
|
|
info.page = page;
|
|
info.size = 0;
|
|
|
|
gnttab_foreach_grant_in_range(page, offset, len,
|
|
xennet_make_one_txreq,
|
|
&info);
|
|
|
|
page++;
|
|
offset = 0;
|
|
len -= info.size;
|
|
}
|
|
|
|
return info.tx;
|
|
}
|
|
|
|
/*
|
|
* Count how many ring slots are required to send this skb. Each frag
|
|
* might be a compound page.
|
|
*/
|
|
static int xennet_count_skb_slots(struct sk_buff *skb)
|
|
{
|
|
int i, frags = skb_shinfo(skb)->nr_frags;
|
|
int slots;
|
|
|
|
slots = gnttab_count_grant(offset_in_page(skb->data),
|
|
skb_headlen(skb));
|
|
|
|
for (i = 0; i < frags; i++) {
|
|
skb_frag_t *frag = skb_shinfo(skb)->frags + i;
|
|
unsigned long size = skb_frag_size(frag);
|
|
unsigned long offset = frag->page_offset;
|
|
|
|
/* Skip unused frames from start of page */
|
|
offset &= ~PAGE_MASK;
|
|
|
|
slots += gnttab_count_grant(offset, size);
|
|
}
|
|
|
|
return slots;
|
|
}
|
|
|
|
static u16 xennet_select_queue(struct net_device *dev, struct sk_buff *skb,
|
|
struct net_device *sb_dev,
|
|
select_queue_fallback_t fallback)
|
|
{
|
|
unsigned int num_queues = dev->real_num_tx_queues;
|
|
u32 hash;
|
|
u16 queue_idx;
|
|
|
|
/* First, check if there is only one queue */
|
|
if (num_queues == 1) {
|
|
queue_idx = 0;
|
|
} else {
|
|
hash = skb_get_hash(skb);
|
|
queue_idx = hash % num_queues;
|
|
}
|
|
|
|
return queue_idx;
|
|
}
|
|
|
|
#define MAX_XEN_SKB_FRAGS (65536 / XEN_PAGE_SIZE + 1)
|
|
|
|
static netdev_tx_t xennet_start_xmit(struct sk_buff *skb, struct net_device *dev)
|
|
{
|
|
struct netfront_info *np = netdev_priv(dev);
|
|
struct netfront_stats *tx_stats = this_cpu_ptr(np->tx_stats);
|
|
struct xen_netif_tx_request *tx, *first_tx;
|
|
unsigned int i;
|
|
int notify;
|
|
int slots;
|
|
struct page *page;
|
|
unsigned int offset;
|
|
unsigned int len;
|
|
unsigned long flags;
|
|
struct netfront_queue *queue = NULL;
|
|
unsigned int num_queues = dev->real_num_tx_queues;
|
|
u16 queue_index;
|
|
struct sk_buff *nskb;
|
|
|
|
/* Drop the packet if no queues are set up */
|
|
if (num_queues < 1)
|
|
goto drop;
|
|
/* Determine which queue to transmit this SKB on */
|
|
queue_index = skb_get_queue_mapping(skb);
|
|
queue = &np->queues[queue_index];
|
|
|
|
/* If skb->len is too big for wire format, drop skb and alert
|
|
* user about misconfiguration.
|
|
*/
|
|
if (unlikely(skb->len > XEN_NETIF_MAX_TX_SIZE)) {
|
|
net_alert_ratelimited(
|
|
"xennet: skb->len = %u, too big for wire format\n",
|
|
skb->len);
|
|
goto drop;
|
|
}
|
|
|
|
slots = xennet_count_skb_slots(skb);
|
|
if (unlikely(slots > MAX_XEN_SKB_FRAGS + 1)) {
|
|
net_dbg_ratelimited("xennet: skb rides the rocket: %d slots, %d bytes\n",
|
|
slots, skb->len);
|
|
if (skb_linearize(skb))
|
|
goto drop;
|
|
}
|
|
|
|
page = virt_to_page(skb->data);
|
|
offset = offset_in_page(skb->data);
|
|
|
|
/* The first req should be at least ETH_HLEN size or the packet will be
|
|
* dropped by netback.
|
|
*/
|
|
if (unlikely(PAGE_SIZE - offset < ETH_HLEN)) {
|
|
nskb = skb_copy(skb, GFP_ATOMIC);
|
|
if (!nskb)
|
|
goto drop;
|
|
dev_consume_skb_any(skb);
|
|
skb = nskb;
|
|
page = virt_to_page(skb->data);
|
|
offset = offset_in_page(skb->data);
|
|
}
|
|
|
|
len = skb_headlen(skb);
|
|
|
|
spin_lock_irqsave(&queue->tx_lock, flags);
|
|
|
|
if (unlikely(!netif_carrier_ok(dev) ||
|
|
(slots > 1 && !xennet_can_sg(dev)) ||
|
|
netif_needs_gso(skb, netif_skb_features(skb)))) {
|
|
spin_unlock_irqrestore(&queue->tx_lock, flags);
|
|
goto drop;
|
|
}
|
|
|
|
/* First request for the linear area. */
|
|
first_tx = tx = xennet_make_first_txreq(queue, skb,
|
|
page, offset, len);
|
|
offset += tx->size;
|
|
if (offset == PAGE_SIZE) {
|
|
page++;
|
|
offset = 0;
|
|
}
|
|
len -= tx->size;
|
|
|
|
if (skb->ip_summed == CHECKSUM_PARTIAL)
|
|
/* local packet? */
|
|
tx->flags |= XEN_NETTXF_csum_blank | XEN_NETTXF_data_validated;
|
|
else if (skb->ip_summed == CHECKSUM_UNNECESSARY)
|
|
/* remote but checksummed. */
|
|
tx->flags |= XEN_NETTXF_data_validated;
|
|
|
|
/* Optional extra info after the first request. */
|
|
if (skb_shinfo(skb)->gso_size) {
|
|
struct xen_netif_extra_info *gso;
|
|
|
|
gso = (struct xen_netif_extra_info *)
|
|
RING_GET_REQUEST(&queue->tx, queue->tx.req_prod_pvt++);
|
|
|
|
tx->flags |= XEN_NETTXF_extra_info;
|
|
|
|
gso->u.gso.size = skb_shinfo(skb)->gso_size;
|
|
gso->u.gso.type = (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV6) ?
|
|
XEN_NETIF_GSO_TYPE_TCPV6 :
|
|
XEN_NETIF_GSO_TYPE_TCPV4;
|
|
gso->u.gso.pad = 0;
|
|
gso->u.gso.features = 0;
|
|
|
|
gso->type = XEN_NETIF_EXTRA_TYPE_GSO;
|
|
gso->flags = 0;
|
|
}
|
|
|
|
/* Requests for the rest of the linear area. */
|
|
tx = xennet_make_txreqs(queue, tx, skb, page, offset, len);
|
|
|
|
/* Requests for all the frags. */
|
|
for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
|
|
skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
|
|
tx = xennet_make_txreqs(queue, tx, skb,
|
|
skb_frag_page(frag), frag->page_offset,
|
|
skb_frag_size(frag));
|
|
}
|
|
|
|
/* First request has the packet length. */
|
|
first_tx->size = skb->len;
|
|
|
|
RING_PUSH_REQUESTS_AND_CHECK_NOTIFY(&queue->tx, notify);
|
|
if (notify)
|
|
notify_remote_via_irq(queue->tx_irq);
|
|
|
|
u64_stats_update_begin(&tx_stats->syncp);
|
|
tx_stats->bytes += skb->len;
|
|
tx_stats->packets++;
|
|
u64_stats_update_end(&tx_stats->syncp);
|
|
|
|
/* Note: It is not safe to access skb after xennet_tx_buf_gc()! */
|
|
xennet_tx_buf_gc(queue);
|
|
|
|
if (!netfront_tx_slot_available(queue))
|
|
netif_tx_stop_queue(netdev_get_tx_queue(dev, queue->id));
|
|
|
|
spin_unlock_irqrestore(&queue->tx_lock, flags);
|
|
|
|
return NETDEV_TX_OK;
|
|
|
|
drop:
|
|
dev->stats.tx_dropped++;
|
|
dev_kfree_skb_any(skb);
|
|
return NETDEV_TX_OK;
|
|
}
|
|
|
|
static int xennet_close(struct net_device *dev)
|
|
{
|
|
struct netfront_info *np = netdev_priv(dev);
|
|
unsigned int num_queues = dev->real_num_tx_queues;
|
|
unsigned int i;
|
|
struct netfront_queue *queue;
|
|
netif_tx_stop_all_queues(np->netdev);
|
|
for (i = 0; i < num_queues; ++i) {
|
|
queue = &np->queues[i];
|
|
napi_disable(&queue->napi);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static void xennet_move_rx_slot(struct netfront_queue *queue, struct sk_buff *skb,
|
|
grant_ref_t ref)
|
|
{
|
|
int new = xennet_rxidx(queue->rx.req_prod_pvt);
|
|
|
|
BUG_ON(queue->rx_skbs[new]);
|
|
queue->rx_skbs[new] = skb;
|
|
queue->grant_rx_ref[new] = ref;
|
|
RING_GET_REQUEST(&queue->rx, queue->rx.req_prod_pvt)->id = new;
|
|
RING_GET_REQUEST(&queue->rx, queue->rx.req_prod_pvt)->gref = ref;
|
|
queue->rx.req_prod_pvt++;
|
|
}
|
|
|
|
static int xennet_get_extras(struct netfront_queue *queue,
|
|
struct xen_netif_extra_info *extras,
|
|
RING_IDX rp)
|
|
|
|
{
|
|
struct xen_netif_extra_info *extra;
|
|
struct device *dev = &queue->info->netdev->dev;
|
|
RING_IDX cons = queue->rx.rsp_cons;
|
|
int err = 0;
|
|
|
|
do {
|
|
struct sk_buff *skb;
|
|
grant_ref_t ref;
|
|
|
|
if (unlikely(cons + 1 == rp)) {
|
|
if (net_ratelimit())
|
|
dev_warn(dev, "Missing extra info\n");
|
|
err = -EBADR;
|
|
break;
|
|
}
|
|
|
|
extra = (struct xen_netif_extra_info *)
|
|
RING_GET_RESPONSE(&queue->rx, ++cons);
|
|
|
|
if (unlikely(!extra->type ||
|
|
extra->type >= XEN_NETIF_EXTRA_TYPE_MAX)) {
|
|
if (net_ratelimit())
|
|
dev_warn(dev, "Invalid extra type: %d\n",
|
|
extra->type);
|
|
err = -EINVAL;
|
|
} else {
|
|
memcpy(&extras[extra->type - 1], extra,
|
|
sizeof(*extra));
|
|
}
|
|
|
|
skb = xennet_get_rx_skb(queue, cons);
|
|
ref = xennet_get_rx_ref(queue, cons);
|
|
xennet_move_rx_slot(queue, skb, ref);
|
|
} while (extra->flags & XEN_NETIF_EXTRA_FLAG_MORE);
|
|
|
|
queue->rx.rsp_cons = cons;
|
|
return err;
|
|
}
|
|
|
|
static int xennet_get_responses(struct netfront_queue *queue,
|
|
struct netfront_rx_info *rinfo, RING_IDX rp,
|
|
struct sk_buff_head *list)
|
|
{
|
|
struct xen_netif_rx_response *rx = &rinfo->rx;
|
|
struct xen_netif_extra_info *extras = rinfo->extras;
|
|
struct device *dev = &queue->info->netdev->dev;
|
|
RING_IDX cons = queue->rx.rsp_cons;
|
|
struct sk_buff *skb = xennet_get_rx_skb(queue, cons);
|
|
grant_ref_t ref = xennet_get_rx_ref(queue, cons);
|
|
int max = XEN_NETIF_NR_SLOTS_MIN + (rx->status <= RX_COPY_THRESHOLD);
|
|
int slots = 1;
|
|
int err = 0;
|
|
unsigned long ret;
|
|
|
|
if (rx->flags & XEN_NETRXF_extra_info) {
|
|
err = xennet_get_extras(queue, extras, rp);
|
|
cons = queue->rx.rsp_cons;
|
|
}
|
|
|
|
for (;;) {
|
|
if (unlikely(rx->status < 0 ||
|
|
rx->offset + rx->status > XEN_PAGE_SIZE)) {
|
|
if (net_ratelimit())
|
|
dev_warn(dev, "rx->offset: %u, size: %d\n",
|
|
rx->offset, rx->status);
|
|
xennet_move_rx_slot(queue, skb, ref);
|
|
err = -EINVAL;
|
|
goto next;
|
|
}
|
|
|
|
/*
|
|
* This definitely indicates a bug, either in this driver or in
|
|
* the backend driver. In future this should flag the bad
|
|
* situation to the system controller to reboot the backend.
|
|
*/
|
|
if (ref == GRANT_INVALID_REF) {
|
|
if (net_ratelimit())
|
|
dev_warn(dev, "Bad rx response id %d.\n",
|
|
rx->id);
|
|
err = -EINVAL;
|
|
goto next;
|
|
}
|
|
|
|
ret = gnttab_end_foreign_access_ref(ref, 0);
|
|
BUG_ON(!ret);
|
|
|
|
gnttab_release_grant_reference(&queue->gref_rx_head, ref);
|
|
|
|
__skb_queue_tail(list, skb);
|
|
|
|
next:
|
|
if (!(rx->flags & XEN_NETRXF_more_data))
|
|
break;
|
|
|
|
if (cons + slots == rp) {
|
|
if (net_ratelimit())
|
|
dev_warn(dev, "Need more slots\n");
|
|
err = -ENOENT;
|
|
break;
|
|
}
|
|
|
|
rx = RING_GET_RESPONSE(&queue->rx, cons + slots);
|
|
skb = xennet_get_rx_skb(queue, cons + slots);
|
|
ref = xennet_get_rx_ref(queue, cons + slots);
|
|
slots++;
|
|
}
|
|
|
|
if (unlikely(slots > max)) {
|
|
if (net_ratelimit())
|
|
dev_warn(dev, "Too many slots\n");
|
|
err = -E2BIG;
|
|
}
|
|
|
|
if (unlikely(err))
|
|
queue->rx.rsp_cons = cons + slots;
|
|
|
|
return err;
|
|
}
|
|
|
|
static int xennet_set_skb_gso(struct sk_buff *skb,
|
|
struct xen_netif_extra_info *gso)
|
|
{
|
|
if (!gso->u.gso.size) {
|
|
if (net_ratelimit())
|
|
pr_warn("GSO size must not be zero\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (gso->u.gso.type != XEN_NETIF_GSO_TYPE_TCPV4 &&
|
|
gso->u.gso.type != XEN_NETIF_GSO_TYPE_TCPV6) {
|
|
if (net_ratelimit())
|
|
pr_warn("Bad GSO type %d\n", gso->u.gso.type);
|
|
return -EINVAL;
|
|
}
|
|
|
|
skb_shinfo(skb)->gso_size = gso->u.gso.size;
|
|
skb_shinfo(skb)->gso_type =
|
|
(gso->u.gso.type == XEN_NETIF_GSO_TYPE_TCPV4) ?
|
|
SKB_GSO_TCPV4 :
|
|
SKB_GSO_TCPV6;
|
|
|
|
/* Header must be checked, and gso_segs computed. */
|
|
skb_shinfo(skb)->gso_type |= SKB_GSO_DODGY;
|
|
skb_shinfo(skb)->gso_segs = 0;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static RING_IDX xennet_fill_frags(struct netfront_queue *queue,
|
|
struct sk_buff *skb,
|
|
struct sk_buff_head *list)
|
|
{
|
|
RING_IDX cons = queue->rx.rsp_cons;
|
|
struct sk_buff *nskb;
|
|
|
|
while ((nskb = __skb_dequeue(list))) {
|
|
struct xen_netif_rx_response *rx =
|
|
RING_GET_RESPONSE(&queue->rx, ++cons);
|
|
skb_frag_t *nfrag = &skb_shinfo(nskb)->frags[0];
|
|
|
|
if (skb_shinfo(skb)->nr_frags == MAX_SKB_FRAGS) {
|
|
unsigned int pull_to = NETFRONT_SKB_CB(skb)->pull_to;
|
|
|
|
BUG_ON(pull_to <= skb_headlen(skb));
|
|
__pskb_pull_tail(skb, pull_to - skb_headlen(skb));
|
|
}
|
|
if (unlikely(skb_shinfo(skb)->nr_frags >= MAX_SKB_FRAGS)) {
|
|
queue->rx.rsp_cons = ++cons;
|
|
kfree_skb(nskb);
|
|
return ~0U;
|
|
}
|
|
|
|
skb_add_rx_frag(skb, skb_shinfo(skb)->nr_frags,
|
|
skb_frag_page(nfrag),
|
|
rx->offset, rx->status, PAGE_SIZE);
|
|
|
|
skb_shinfo(nskb)->nr_frags = 0;
|
|
kfree_skb(nskb);
|
|
}
|
|
|
|
return cons;
|
|
}
|
|
|
|
static int checksum_setup(struct net_device *dev, struct sk_buff *skb)
|
|
{
|
|
bool recalculate_partial_csum = false;
|
|
|
|
/*
|
|
* A GSO SKB must be CHECKSUM_PARTIAL. However some buggy
|
|
* peers can fail to set NETRXF_csum_blank when sending a GSO
|
|
* frame. In this case force the SKB to CHECKSUM_PARTIAL and
|
|
* recalculate the partial checksum.
|
|
*/
|
|
if (skb->ip_summed != CHECKSUM_PARTIAL && skb_is_gso(skb)) {
|
|
struct netfront_info *np = netdev_priv(dev);
|
|
atomic_inc(&np->rx_gso_checksum_fixup);
|
|
skb->ip_summed = CHECKSUM_PARTIAL;
|
|
recalculate_partial_csum = true;
|
|
}
|
|
|
|
/* A non-CHECKSUM_PARTIAL SKB does not require setup. */
|
|
if (skb->ip_summed != CHECKSUM_PARTIAL)
|
|
return 0;
|
|
|
|
return skb_checksum_setup(skb, recalculate_partial_csum);
|
|
}
|
|
|
|
static int handle_incoming_queue(struct netfront_queue *queue,
|
|
struct sk_buff_head *rxq)
|
|
{
|
|
struct netfront_stats *rx_stats = this_cpu_ptr(queue->info->rx_stats);
|
|
int packets_dropped = 0;
|
|
struct sk_buff *skb;
|
|
|
|
while ((skb = __skb_dequeue(rxq)) != NULL) {
|
|
int pull_to = NETFRONT_SKB_CB(skb)->pull_to;
|
|
|
|
if (pull_to > skb_headlen(skb))
|
|
__pskb_pull_tail(skb, pull_to - skb_headlen(skb));
|
|
|
|
/* Ethernet work: Delayed to here as it peeks the header. */
|
|
skb->protocol = eth_type_trans(skb, queue->info->netdev);
|
|
skb_reset_network_header(skb);
|
|
|
|
if (checksum_setup(queue->info->netdev, skb)) {
|
|
kfree_skb(skb);
|
|
packets_dropped++;
|
|
queue->info->netdev->stats.rx_errors++;
|
|
continue;
|
|
}
|
|
|
|
u64_stats_update_begin(&rx_stats->syncp);
|
|
rx_stats->packets++;
|
|
rx_stats->bytes += skb->len;
|
|
u64_stats_update_end(&rx_stats->syncp);
|
|
|
|
/* Pass it up. */
|
|
napi_gro_receive(&queue->napi, skb);
|
|
}
|
|
|
|
return packets_dropped;
|
|
}
|
|
|
|
static int xennet_poll(struct napi_struct *napi, int budget)
|
|
{
|
|
struct netfront_queue *queue = container_of(napi, struct netfront_queue, napi);
|
|
struct net_device *dev = queue->info->netdev;
|
|
struct sk_buff *skb;
|
|
struct netfront_rx_info rinfo;
|
|
struct xen_netif_rx_response *rx = &rinfo.rx;
|
|
struct xen_netif_extra_info *extras = rinfo.extras;
|
|
RING_IDX i, rp;
|
|
int work_done;
|
|
struct sk_buff_head rxq;
|
|
struct sk_buff_head errq;
|
|
struct sk_buff_head tmpq;
|
|
int err;
|
|
|
|
spin_lock(&queue->rx_lock);
|
|
|
|
skb_queue_head_init(&rxq);
|
|
skb_queue_head_init(&errq);
|
|
skb_queue_head_init(&tmpq);
|
|
|
|
rp = queue->rx.sring->rsp_prod;
|
|
rmb(); /* Ensure we see queued responses up to 'rp'. */
|
|
|
|
i = queue->rx.rsp_cons;
|
|
work_done = 0;
|
|
while ((i != rp) && (work_done < budget)) {
|
|
memcpy(rx, RING_GET_RESPONSE(&queue->rx, i), sizeof(*rx));
|
|
memset(extras, 0, sizeof(rinfo.extras));
|
|
|
|
err = xennet_get_responses(queue, &rinfo, rp, &tmpq);
|
|
|
|
if (unlikely(err)) {
|
|
err:
|
|
while ((skb = __skb_dequeue(&tmpq)))
|
|
__skb_queue_tail(&errq, skb);
|
|
dev->stats.rx_errors++;
|
|
i = queue->rx.rsp_cons;
|
|
continue;
|
|
}
|
|
|
|
skb = __skb_dequeue(&tmpq);
|
|
|
|
if (extras[XEN_NETIF_EXTRA_TYPE_GSO - 1].type) {
|
|
struct xen_netif_extra_info *gso;
|
|
gso = &extras[XEN_NETIF_EXTRA_TYPE_GSO - 1];
|
|
|
|
if (unlikely(xennet_set_skb_gso(skb, gso))) {
|
|
__skb_queue_head(&tmpq, skb);
|
|
queue->rx.rsp_cons += skb_queue_len(&tmpq);
|
|
goto err;
|
|
}
|
|
}
|
|
|
|
NETFRONT_SKB_CB(skb)->pull_to = rx->status;
|
|
if (NETFRONT_SKB_CB(skb)->pull_to > RX_COPY_THRESHOLD)
|
|
NETFRONT_SKB_CB(skb)->pull_to = RX_COPY_THRESHOLD;
|
|
|
|
skb_shinfo(skb)->frags[0].page_offset = rx->offset;
|
|
skb_frag_size_set(&skb_shinfo(skb)->frags[0], rx->status);
|
|
skb->data_len = rx->status;
|
|
skb->len += rx->status;
|
|
|
|
i = xennet_fill_frags(queue, skb, &tmpq);
|
|
if (unlikely(i == ~0U))
|
|
goto err;
|
|
|
|
if (rx->flags & XEN_NETRXF_csum_blank)
|
|
skb->ip_summed = CHECKSUM_PARTIAL;
|
|
else if (rx->flags & XEN_NETRXF_data_validated)
|
|
skb->ip_summed = CHECKSUM_UNNECESSARY;
|
|
|
|
__skb_queue_tail(&rxq, skb);
|
|
|
|
queue->rx.rsp_cons = ++i;
|
|
work_done++;
|
|
}
|
|
|
|
__skb_queue_purge(&errq);
|
|
|
|
work_done -= handle_incoming_queue(queue, &rxq);
|
|
|
|
xennet_alloc_rx_buffers(queue);
|
|
|
|
if (work_done < budget) {
|
|
int more_to_do = 0;
|
|
|
|
napi_complete_done(napi, work_done);
|
|
|
|
RING_FINAL_CHECK_FOR_RESPONSES(&queue->rx, more_to_do);
|
|
if (more_to_do)
|
|
napi_schedule(napi);
|
|
}
|
|
|
|
spin_unlock(&queue->rx_lock);
|
|
|
|
return work_done;
|
|
}
|
|
|
|
static int xennet_change_mtu(struct net_device *dev, int mtu)
|
|
{
|
|
int max = xennet_can_sg(dev) ? XEN_NETIF_MAX_TX_SIZE : ETH_DATA_LEN;
|
|
|
|
if (mtu > max)
|
|
return -EINVAL;
|
|
dev->mtu = mtu;
|
|
return 0;
|
|
}
|
|
|
|
static void xennet_get_stats64(struct net_device *dev,
|
|
struct rtnl_link_stats64 *tot)
|
|
{
|
|
struct netfront_info *np = netdev_priv(dev);
|
|
int cpu;
|
|
|
|
for_each_possible_cpu(cpu) {
|
|
struct netfront_stats *rx_stats = per_cpu_ptr(np->rx_stats, cpu);
|
|
struct netfront_stats *tx_stats = per_cpu_ptr(np->tx_stats, cpu);
|
|
u64 rx_packets, rx_bytes, tx_packets, tx_bytes;
|
|
unsigned int start;
|
|
|
|
do {
|
|
start = u64_stats_fetch_begin_irq(&tx_stats->syncp);
|
|
tx_packets = tx_stats->packets;
|
|
tx_bytes = tx_stats->bytes;
|
|
} while (u64_stats_fetch_retry_irq(&tx_stats->syncp, start));
|
|
|
|
do {
|
|
start = u64_stats_fetch_begin_irq(&rx_stats->syncp);
|
|
rx_packets = rx_stats->packets;
|
|
rx_bytes = rx_stats->bytes;
|
|
} while (u64_stats_fetch_retry_irq(&rx_stats->syncp, start));
|
|
|
|
tot->rx_packets += rx_packets;
|
|
tot->tx_packets += tx_packets;
|
|
tot->rx_bytes += rx_bytes;
|
|
tot->tx_bytes += tx_bytes;
|
|
}
|
|
|
|
tot->rx_errors = dev->stats.rx_errors;
|
|
tot->tx_dropped = dev->stats.tx_dropped;
|
|
}
|
|
|
|
static void xennet_release_tx_bufs(struct netfront_queue *queue)
|
|
{
|
|
struct sk_buff *skb;
|
|
int i;
|
|
|
|
for (i = 0; i < NET_TX_RING_SIZE; i++) {
|
|
/* Skip over entries which are actually freelist references */
|
|
if (skb_entry_is_link(&queue->tx_skbs[i]))
|
|
continue;
|
|
|
|
skb = queue->tx_skbs[i].skb;
|
|
get_page(queue->grant_tx_page[i]);
|
|
gnttab_end_foreign_access(queue->grant_tx_ref[i],
|
|
GNTMAP_readonly,
|
|
(unsigned long)page_address(queue->grant_tx_page[i]));
|
|
queue->grant_tx_page[i] = NULL;
|
|
queue->grant_tx_ref[i] = GRANT_INVALID_REF;
|
|
add_id_to_freelist(&queue->tx_skb_freelist, queue->tx_skbs, i);
|
|
dev_kfree_skb_irq(skb);
|
|
}
|
|
}
|
|
|
|
static void xennet_release_rx_bufs(struct netfront_queue *queue)
|
|
{
|
|
int id, ref;
|
|
|
|
spin_lock_bh(&queue->rx_lock);
|
|
|
|
for (id = 0; id < NET_RX_RING_SIZE; id++) {
|
|
struct sk_buff *skb;
|
|
struct page *page;
|
|
|
|
skb = queue->rx_skbs[id];
|
|
if (!skb)
|
|
continue;
|
|
|
|
ref = queue->grant_rx_ref[id];
|
|
if (ref == GRANT_INVALID_REF)
|
|
continue;
|
|
|
|
page = skb_frag_page(&skb_shinfo(skb)->frags[0]);
|
|
|
|
/* gnttab_end_foreign_access() needs a page ref until
|
|
* foreign access is ended (which may be deferred).
|
|
*/
|
|
get_page(page);
|
|
gnttab_end_foreign_access(ref, 0,
|
|
(unsigned long)page_address(page));
|
|
queue->grant_rx_ref[id] = GRANT_INVALID_REF;
|
|
|
|
kfree_skb(skb);
|
|
}
|
|
|
|
spin_unlock_bh(&queue->rx_lock);
|
|
}
|
|
|
|
static netdev_features_t xennet_fix_features(struct net_device *dev,
|
|
netdev_features_t features)
|
|
{
|
|
struct netfront_info *np = netdev_priv(dev);
|
|
|
|
if (features & NETIF_F_SG &&
|
|
!xenbus_read_unsigned(np->xbdev->otherend, "feature-sg", 0))
|
|
features &= ~NETIF_F_SG;
|
|
|
|
if (features & NETIF_F_IPV6_CSUM &&
|
|
!xenbus_read_unsigned(np->xbdev->otherend,
|
|
"feature-ipv6-csum-offload", 0))
|
|
features &= ~NETIF_F_IPV6_CSUM;
|
|
|
|
if (features & NETIF_F_TSO &&
|
|
!xenbus_read_unsigned(np->xbdev->otherend, "feature-gso-tcpv4", 0))
|
|
features &= ~NETIF_F_TSO;
|
|
|
|
if (features & NETIF_F_TSO6 &&
|
|
!xenbus_read_unsigned(np->xbdev->otherend, "feature-gso-tcpv6", 0))
|
|
features &= ~NETIF_F_TSO6;
|
|
|
|
return features;
|
|
}
|
|
|
|
static int xennet_set_features(struct net_device *dev,
|
|
netdev_features_t features)
|
|
{
|
|
if (!(features & NETIF_F_SG) && dev->mtu > ETH_DATA_LEN) {
|
|
netdev_info(dev, "Reducing MTU because no SG offload");
|
|
dev->mtu = ETH_DATA_LEN;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static irqreturn_t xennet_tx_interrupt(int irq, void *dev_id)
|
|
{
|
|
struct netfront_queue *queue = dev_id;
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&queue->tx_lock, flags);
|
|
xennet_tx_buf_gc(queue);
|
|
spin_unlock_irqrestore(&queue->tx_lock, flags);
|
|
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
static irqreturn_t xennet_rx_interrupt(int irq, void *dev_id)
|
|
{
|
|
struct netfront_queue *queue = dev_id;
|
|
struct net_device *dev = queue->info->netdev;
|
|
|
|
if (likely(netif_carrier_ok(dev) &&
|
|
RING_HAS_UNCONSUMED_RESPONSES(&queue->rx)))
|
|
napi_schedule(&queue->napi);
|
|
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
static irqreturn_t xennet_interrupt(int irq, void *dev_id)
|
|
{
|
|
xennet_tx_interrupt(irq, dev_id);
|
|
xennet_rx_interrupt(irq, dev_id);
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
#ifdef CONFIG_NET_POLL_CONTROLLER
|
|
static void xennet_poll_controller(struct net_device *dev)
|
|
{
|
|
/* Poll each queue */
|
|
struct netfront_info *info = netdev_priv(dev);
|
|
unsigned int num_queues = dev->real_num_tx_queues;
|
|
unsigned int i;
|
|
for (i = 0; i < num_queues; ++i)
|
|
xennet_interrupt(0, &info->queues[i]);
|
|
}
|
|
#endif
|
|
|
|
static const struct net_device_ops xennet_netdev_ops = {
|
|
.ndo_open = xennet_open,
|
|
.ndo_stop = xennet_close,
|
|
.ndo_start_xmit = xennet_start_xmit,
|
|
.ndo_change_mtu = xennet_change_mtu,
|
|
.ndo_get_stats64 = xennet_get_stats64,
|
|
.ndo_set_mac_address = eth_mac_addr,
|
|
.ndo_validate_addr = eth_validate_addr,
|
|
.ndo_fix_features = xennet_fix_features,
|
|
.ndo_set_features = xennet_set_features,
|
|
.ndo_select_queue = xennet_select_queue,
|
|
#ifdef CONFIG_NET_POLL_CONTROLLER
|
|
.ndo_poll_controller = xennet_poll_controller,
|
|
#endif
|
|
};
|
|
|
|
static void xennet_free_netdev(struct net_device *netdev)
|
|
{
|
|
struct netfront_info *np = netdev_priv(netdev);
|
|
|
|
free_percpu(np->rx_stats);
|
|
free_percpu(np->tx_stats);
|
|
free_netdev(netdev);
|
|
}
|
|
|
|
static struct net_device *xennet_create_dev(struct xenbus_device *dev)
|
|
{
|
|
int err;
|
|
struct net_device *netdev;
|
|
struct netfront_info *np;
|
|
|
|
netdev = alloc_etherdev_mq(sizeof(struct netfront_info), xennet_max_queues);
|
|
if (!netdev)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
np = netdev_priv(netdev);
|
|
np->xbdev = dev;
|
|
|
|
np->queues = NULL;
|
|
|
|
err = -ENOMEM;
|
|
np->rx_stats = netdev_alloc_pcpu_stats(struct netfront_stats);
|
|
if (np->rx_stats == NULL)
|
|
goto exit;
|
|
np->tx_stats = netdev_alloc_pcpu_stats(struct netfront_stats);
|
|
if (np->tx_stats == NULL)
|
|
goto exit;
|
|
|
|
netdev->netdev_ops = &xennet_netdev_ops;
|
|
|
|
netdev->features = NETIF_F_IP_CSUM | NETIF_F_RXCSUM |
|
|
NETIF_F_GSO_ROBUST;
|
|
netdev->hw_features = NETIF_F_SG |
|
|
NETIF_F_IPV6_CSUM |
|
|
NETIF_F_TSO | NETIF_F_TSO6;
|
|
|
|
/*
|
|
* Assume that all hw features are available for now. This set
|
|
* will be adjusted by the call to netdev_update_features() in
|
|
* xennet_connect() which is the earliest point where we can
|
|
* negotiate with the backend regarding supported features.
|
|
*/
|
|
netdev->features |= netdev->hw_features;
|
|
|
|
netdev->ethtool_ops = &xennet_ethtool_ops;
|
|
netdev->min_mtu = ETH_MIN_MTU;
|
|
netdev->max_mtu = XEN_NETIF_MAX_TX_SIZE;
|
|
SET_NETDEV_DEV(netdev, &dev->dev);
|
|
|
|
np->netdev = netdev;
|
|
|
|
netif_carrier_off(netdev);
|
|
|
|
xenbus_switch_state(dev, XenbusStateInitialising);
|
|
wait_event(module_wq,
|
|
xenbus_read_driver_state(dev->otherend) !=
|
|
XenbusStateClosed &&
|
|
xenbus_read_driver_state(dev->otherend) !=
|
|
XenbusStateUnknown);
|
|
return netdev;
|
|
|
|
exit:
|
|
xennet_free_netdev(netdev);
|
|
return ERR_PTR(err);
|
|
}
|
|
|
|
/**
|
|
* Entry point to this code when a new device is created. Allocate the basic
|
|
* structures and the ring buffers for communication with the backend, and
|
|
* inform the backend of the appropriate details for those.
|
|
*/
|
|
static int netfront_probe(struct xenbus_device *dev,
|
|
const struct xenbus_device_id *id)
|
|
{
|
|
int err;
|
|
struct net_device *netdev;
|
|
struct netfront_info *info;
|
|
|
|
netdev = xennet_create_dev(dev);
|
|
if (IS_ERR(netdev)) {
|
|
err = PTR_ERR(netdev);
|
|
xenbus_dev_fatal(dev, err, "creating netdev");
|
|
return err;
|
|
}
|
|
|
|
info = netdev_priv(netdev);
|
|
dev_set_drvdata(&dev->dev, info);
|
|
#ifdef CONFIG_SYSFS
|
|
info->netdev->sysfs_groups[0] = &xennet_dev_group;
|
|
#endif
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void xennet_end_access(int ref, void *page)
|
|
{
|
|
/* This frees the page as a side-effect */
|
|
if (ref != GRANT_INVALID_REF)
|
|
gnttab_end_foreign_access(ref, 0, (unsigned long)page);
|
|
}
|
|
|
|
static void xennet_disconnect_backend(struct netfront_info *info)
|
|
{
|
|
unsigned int i = 0;
|
|
unsigned int num_queues = info->netdev->real_num_tx_queues;
|
|
|
|
netif_carrier_off(info->netdev);
|
|
|
|
for (i = 0; i < num_queues && info->queues; ++i) {
|
|
struct netfront_queue *queue = &info->queues[i];
|
|
|
|
del_timer_sync(&queue->rx_refill_timer);
|
|
|
|
if (queue->tx_irq && (queue->tx_irq == queue->rx_irq))
|
|
unbind_from_irqhandler(queue->tx_irq, queue);
|
|
if (queue->tx_irq && (queue->tx_irq != queue->rx_irq)) {
|
|
unbind_from_irqhandler(queue->tx_irq, queue);
|
|
unbind_from_irqhandler(queue->rx_irq, queue);
|
|
}
|
|
queue->tx_evtchn = queue->rx_evtchn = 0;
|
|
queue->tx_irq = queue->rx_irq = 0;
|
|
|
|
if (netif_running(info->netdev))
|
|
napi_synchronize(&queue->napi);
|
|
|
|
xennet_release_tx_bufs(queue);
|
|
xennet_release_rx_bufs(queue);
|
|
gnttab_free_grant_references(queue->gref_tx_head);
|
|
gnttab_free_grant_references(queue->gref_rx_head);
|
|
|
|
/* End access and free the pages */
|
|
xennet_end_access(queue->tx_ring_ref, queue->tx.sring);
|
|
xennet_end_access(queue->rx_ring_ref, queue->rx.sring);
|
|
|
|
queue->tx_ring_ref = GRANT_INVALID_REF;
|
|
queue->rx_ring_ref = GRANT_INVALID_REF;
|
|
queue->tx.sring = NULL;
|
|
queue->rx.sring = NULL;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* We are reconnecting to the backend, due to a suspend/resume, or a backend
|
|
* driver restart. We tear down our netif structure and recreate it, but
|
|
* leave the device-layer structures intact so that this is transparent to the
|
|
* rest of the kernel.
|
|
*/
|
|
static int netfront_resume(struct xenbus_device *dev)
|
|
{
|
|
struct netfront_info *info = dev_get_drvdata(&dev->dev);
|
|
|
|
dev_dbg(&dev->dev, "%s\n", dev->nodename);
|
|
|
|
xennet_disconnect_backend(info);
|
|
return 0;
|
|
}
|
|
|
|
static int xen_net_read_mac(struct xenbus_device *dev, u8 mac[])
|
|
{
|
|
char *s, *e, *macstr;
|
|
int i;
|
|
|
|
macstr = s = xenbus_read(XBT_NIL, dev->nodename, "mac", NULL);
|
|
if (IS_ERR(macstr))
|
|
return PTR_ERR(macstr);
|
|
|
|
for (i = 0; i < ETH_ALEN; i++) {
|
|
mac[i] = simple_strtoul(s, &e, 16);
|
|
if ((s == e) || (*e != ((i == ETH_ALEN-1) ? '\0' : ':'))) {
|
|
kfree(macstr);
|
|
return -ENOENT;
|
|
}
|
|
s = e+1;
|
|
}
|
|
|
|
kfree(macstr);
|
|
return 0;
|
|
}
|
|
|
|
static int setup_netfront_single(struct netfront_queue *queue)
|
|
{
|
|
int err;
|
|
|
|
err = xenbus_alloc_evtchn(queue->info->xbdev, &queue->tx_evtchn);
|
|
if (err < 0)
|
|
goto fail;
|
|
|
|
err = bind_evtchn_to_irqhandler(queue->tx_evtchn,
|
|
xennet_interrupt,
|
|
0, queue->info->netdev->name, queue);
|
|
if (err < 0)
|
|
goto bind_fail;
|
|
queue->rx_evtchn = queue->tx_evtchn;
|
|
queue->rx_irq = queue->tx_irq = err;
|
|
|
|
return 0;
|
|
|
|
bind_fail:
|
|
xenbus_free_evtchn(queue->info->xbdev, queue->tx_evtchn);
|
|
queue->tx_evtchn = 0;
|
|
fail:
|
|
return err;
|
|
}
|
|
|
|
static int setup_netfront_split(struct netfront_queue *queue)
|
|
{
|
|
int err;
|
|
|
|
err = xenbus_alloc_evtchn(queue->info->xbdev, &queue->tx_evtchn);
|
|
if (err < 0)
|
|
goto fail;
|
|
err = xenbus_alloc_evtchn(queue->info->xbdev, &queue->rx_evtchn);
|
|
if (err < 0)
|
|
goto alloc_rx_evtchn_fail;
|
|
|
|
snprintf(queue->tx_irq_name, sizeof(queue->tx_irq_name),
|
|
"%s-tx", queue->name);
|
|
err = bind_evtchn_to_irqhandler(queue->tx_evtchn,
|
|
xennet_tx_interrupt,
|
|
0, queue->tx_irq_name, queue);
|
|
if (err < 0)
|
|
goto bind_tx_fail;
|
|
queue->tx_irq = err;
|
|
|
|
snprintf(queue->rx_irq_name, sizeof(queue->rx_irq_name),
|
|
"%s-rx", queue->name);
|
|
err = bind_evtchn_to_irqhandler(queue->rx_evtchn,
|
|
xennet_rx_interrupt,
|
|
0, queue->rx_irq_name, queue);
|
|
if (err < 0)
|
|
goto bind_rx_fail;
|
|
queue->rx_irq = err;
|
|
|
|
return 0;
|
|
|
|
bind_rx_fail:
|
|
unbind_from_irqhandler(queue->tx_irq, queue);
|
|
queue->tx_irq = 0;
|
|
bind_tx_fail:
|
|
xenbus_free_evtchn(queue->info->xbdev, queue->rx_evtchn);
|
|
queue->rx_evtchn = 0;
|
|
alloc_rx_evtchn_fail:
|
|
xenbus_free_evtchn(queue->info->xbdev, queue->tx_evtchn);
|
|
queue->tx_evtchn = 0;
|
|
fail:
|
|
return err;
|
|
}
|
|
|
|
static int setup_netfront(struct xenbus_device *dev,
|
|
struct netfront_queue *queue, unsigned int feature_split_evtchn)
|
|
{
|
|
struct xen_netif_tx_sring *txs;
|
|
struct xen_netif_rx_sring *rxs;
|
|
grant_ref_t gref;
|
|
int err;
|
|
|
|
queue->tx_ring_ref = GRANT_INVALID_REF;
|
|
queue->rx_ring_ref = GRANT_INVALID_REF;
|
|
queue->rx.sring = NULL;
|
|
queue->tx.sring = NULL;
|
|
|
|
txs = (struct xen_netif_tx_sring *)get_zeroed_page(GFP_NOIO | __GFP_HIGH);
|
|
if (!txs) {
|
|
err = -ENOMEM;
|
|
xenbus_dev_fatal(dev, err, "allocating tx ring page");
|
|
goto fail;
|
|
}
|
|
SHARED_RING_INIT(txs);
|
|
FRONT_RING_INIT(&queue->tx, txs, XEN_PAGE_SIZE);
|
|
|
|
err = xenbus_grant_ring(dev, txs, 1, &gref);
|
|
if (err < 0)
|
|
goto grant_tx_ring_fail;
|
|
queue->tx_ring_ref = gref;
|
|
|
|
rxs = (struct xen_netif_rx_sring *)get_zeroed_page(GFP_NOIO | __GFP_HIGH);
|
|
if (!rxs) {
|
|
err = -ENOMEM;
|
|
xenbus_dev_fatal(dev, err, "allocating rx ring page");
|
|
goto alloc_rx_ring_fail;
|
|
}
|
|
SHARED_RING_INIT(rxs);
|
|
FRONT_RING_INIT(&queue->rx, rxs, XEN_PAGE_SIZE);
|
|
|
|
err = xenbus_grant_ring(dev, rxs, 1, &gref);
|
|
if (err < 0)
|
|
goto grant_rx_ring_fail;
|
|
queue->rx_ring_ref = gref;
|
|
|
|
if (feature_split_evtchn)
|
|
err = setup_netfront_split(queue);
|
|
/* setup single event channel if
|
|
* a) feature-split-event-channels == 0
|
|
* b) feature-split-event-channels == 1 but failed to setup
|
|
*/
|
|
if (!feature_split_evtchn || (feature_split_evtchn && err))
|
|
err = setup_netfront_single(queue);
|
|
|
|
if (err)
|
|
goto alloc_evtchn_fail;
|
|
|
|
return 0;
|
|
|
|
/* If we fail to setup netfront, it is safe to just revoke access to
|
|
* granted pages because backend is not accessing it at this point.
|
|
*/
|
|
alloc_evtchn_fail:
|
|
gnttab_end_foreign_access_ref(queue->rx_ring_ref, 0);
|
|
grant_rx_ring_fail:
|
|
free_page((unsigned long)rxs);
|
|
alloc_rx_ring_fail:
|
|
gnttab_end_foreign_access_ref(queue->tx_ring_ref, 0);
|
|
grant_tx_ring_fail:
|
|
free_page((unsigned long)txs);
|
|
fail:
|
|
return err;
|
|
}
|
|
|
|
/* Queue-specific initialisation
|
|
* This used to be done in xennet_create_dev() but must now
|
|
* be run per-queue.
|
|
*/
|
|
static int xennet_init_queue(struct netfront_queue *queue)
|
|
{
|
|
unsigned short i;
|
|
int err = 0;
|
|
char *devid;
|
|
|
|
spin_lock_init(&queue->tx_lock);
|
|
spin_lock_init(&queue->rx_lock);
|
|
|
|
timer_setup(&queue->rx_refill_timer, rx_refill_timeout, 0);
|
|
|
|
devid = strrchr(queue->info->xbdev->nodename, '/') + 1;
|
|
snprintf(queue->name, sizeof(queue->name), "vif%s-q%u",
|
|
devid, queue->id);
|
|
|
|
/* Initialise tx_skbs as a free chain containing every entry. */
|
|
queue->tx_skb_freelist = 0;
|
|
for (i = 0; i < NET_TX_RING_SIZE; i++) {
|
|
skb_entry_set_link(&queue->tx_skbs[i], i+1);
|
|
queue->grant_tx_ref[i] = GRANT_INVALID_REF;
|
|
queue->grant_tx_page[i] = NULL;
|
|
}
|
|
|
|
/* Clear out rx_skbs */
|
|
for (i = 0; i < NET_RX_RING_SIZE; i++) {
|
|
queue->rx_skbs[i] = NULL;
|
|
queue->grant_rx_ref[i] = GRANT_INVALID_REF;
|
|
}
|
|
|
|
/* A grant for every tx ring slot */
|
|
if (gnttab_alloc_grant_references(NET_TX_RING_SIZE,
|
|
&queue->gref_tx_head) < 0) {
|
|
pr_alert("can't alloc tx grant refs\n");
|
|
err = -ENOMEM;
|
|
goto exit;
|
|
}
|
|
|
|
/* A grant for every rx ring slot */
|
|
if (gnttab_alloc_grant_references(NET_RX_RING_SIZE,
|
|
&queue->gref_rx_head) < 0) {
|
|
pr_alert("can't alloc rx grant refs\n");
|
|
err = -ENOMEM;
|
|
goto exit_free_tx;
|
|
}
|
|
|
|
return 0;
|
|
|
|
exit_free_tx:
|
|
gnttab_free_grant_references(queue->gref_tx_head);
|
|
exit:
|
|
return err;
|
|
}
|
|
|
|
static int write_queue_xenstore_keys(struct netfront_queue *queue,
|
|
struct xenbus_transaction *xbt, int write_hierarchical)
|
|
{
|
|
/* Write the queue-specific keys into XenStore in the traditional
|
|
* way for a single queue, or in a queue subkeys for multiple
|
|
* queues.
|
|
*/
|
|
struct xenbus_device *dev = queue->info->xbdev;
|
|
int err;
|
|
const char *message;
|
|
char *path;
|
|
size_t pathsize;
|
|
|
|
/* Choose the correct place to write the keys */
|
|
if (write_hierarchical) {
|
|
pathsize = strlen(dev->nodename) + 10;
|
|
path = kzalloc(pathsize, GFP_KERNEL);
|
|
if (!path) {
|
|
err = -ENOMEM;
|
|
message = "out of memory while writing ring references";
|
|
goto error;
|
|
}
|
|
snprintf(path, pathsize, "%s/queue-%u",
|
|
dev->nodename, queue->id);
|
|
} else {
|
|
path = (char *)dev->nodename;
|
|
}
|
|
|
|
/* Write ring references */
|
|
err = xenbus_printf(*xbt, path, "tx-ring-ref", "%u",
|
|
queue->tx_ring_ref);
|
|
if (err) {
|
|
message = "writing tx-ring-ref";
|
|
goto error;
|
|
}
|
|
|
|
err = xenbus_printf(*xbt, path, "rx-ring-ref", "%u",
|
|
queue->rx_ring_ref);
|
|
if (err) {
|
|
message = "writing rx-ring-ref";
|
|
goto error;
|
|
}
|
|
|
|
/* Write event channels; taking into account both shared
|
|
* and split event channel scenarios.
|
|
*/
|
|
if (queue->tx_evtchn == queue->rx_evtchn) {
|
|
/* Shared event channel */
|
|
err = xenbus_printf(*xbt, path,
|
|
"event-channel", "%u", queue->tx_evtchn);
|
|
if (err) {
|
|
message = "writing event-channel";
|
|
goto error;
|
|
}
|
|
} else {
|
|
/* Split event channels */
|
|
err = xenbus_printf(*xbt, path,
|
|
"event-channel-tx", "%u", queue->tx_evtchn);
|
|
if (err) {
|
|
message = "writing event-channel-tx";
|
|
goto error;
|
|
}
|
|
|
|
err = xenbus_printf(*xbt, path,
|
|
"event-channel-rx", "%u", queue->rx_evtchn);
|
|
if (err) {
|
|
message = "writing event-channel-rx";
|
|
goto error;
|
|
}
|
|
}
|
|
|
|
if (write_hierarchical)
|
|
kfree(path);
|
|
return 0;
|
|
|
|
error:
|
|
if (write_hierarchical)
|
|
kfree(path);
|
|
xenbus_dev_fatal(dev, err, "%s", message);
|
|
return err;
|
|
}
|
|
|
|
static void xennet_destroy_queues(struct netfront_info *info)
|
|
{
|
|
unsigned int i;
|
|
|
|
for (i = 0; i < info->netdev->real_num_tx_queues; i++) {
|
|
struct netfront_queue *queue = &info->queues[i];
|
|
|
|
if (netif_running(info->netdev))
|
|
napi_disable(&queue->napi);
|
|
netif_napi_del(&queue->napi);
|
|
}
|
|
|
|
kfree(info->queues);
|
|
info->queues = NULL;
|
|
}
|
|
|
|
static int xennet_create_queues(struct netfront_info *info,
|
|
unsigned int *num_queues)
|
|
{
|
|
unsigned int i;
|
|
int ret;
|
|
|
|
info->queues = kcalloc(*num_queues, sizeof(struct netfront_queue),
|
|
GFP_KERNEL);
|
|
if (!info->queues)
|
|
return -ENOMEM;
|
|
|
|
for (i = 0; i < *num_queues; i++) {
|
|
struct netfront_queue *queue = &info->queues[i];
|
|
|
|
queue->id = i;
|
|
queue->info = info;
|
|
|
|
ret = xennet_init_queue(queue);
|
|
if (ret < 0) {
|
|
dev_warn(&info->xbdev->dev,
|
|
"only created %d queues\n", i);
|
|
*num_queues = i;
|
|
break;
|
|
}
|
|
|
|
netif_napi_add(queue->info->netdev, &queue->napi,
|
|
xennet_poll, 64);
|
|
if (netif_running(info->netdev))
|
|
napi_enable(&queue->napi);
|
|
}
|
|
|
|
netif_set_real_num_tx_queues(info->netdev, *num_queues);
|
|
|
|
if (*num_queues == 0) {
|
|
dev_err(&info->xbdev->dev, "no queues\n");
|
|
return -EINVAL;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/* Common code used when first setting up, and when resuming. */
|
|
static int talk_to_netback(struct xenbus_device *dev,
|
|
struct netfront_info *info)
|
|
{
|
|
const char *message;
|
|
struct xenbus_transaction xbt;
|
|
int err;
|
|
unsigned int feature_split_evtchn;
|
|
unsigned int i = 0;
|
|
unsigned int max_queues = 0;
|
|
struct netfront_queue *queue = NULL;
|
|
unsigned int num_queues = 1;
|
|
|
|
info->netdev->irq = 0;
|
|
|
|
/* Check if backend supports multiple queues */
|
|
max_queues = xenbus_read_unsigned(info->xbdev->otherend,
|
|
"multi-queue-max-queues", 1);
|
|
num_queues = min(max_queues, xennet_max_queues);
|
|
|
|
/* Check feature-split-event-channels */
|
|
feature_split_evtchn = xenbus_read_unsigned(info->xbdev->otherend,
|
|
"feature-split-event-channels", 0);
|
|
|
|
/* Read mac addr. */
|
|
err = xen_net_read_mac(dev, info->netdev->dev_addr);
|
|
if (err) {
|
|
xenbus_dev_fatal(dev, err, "parsing %s/mac", dev->nodename);
|
|
goto out_unlocked;
|
|
}
|
|
|
|
rtnl_lock();
|
|
if (info->queues)
|
|
xennet_destroy_queues(info);
|
|
|
|
err = xennet_create_queues(info, &num_queues);
|
|
if (err < 0) {
|
|
xenbus_dev_fatal(dev, err, "creating queues");
|
|
kfree(info->queues);
|
|
info->queues = NULL;
|
|
goto out;
|
|
}
|
|
rtnl_unlock();
|
|
|
|
/* Create shared ring, alloc event channel -- for each queue */
|
|
for (i = 0; i < num_queues; ++i) {
|
|
queue = &info->queues[i];
|
|
err = setup_netfront(dev, queue, feature_split_evtchn);
|
|
if (err)
|
|
goto destroy_ring;
|
|
}
|
|
|
|
again:
|
|
err = xenbus_transaction_start(&xbt);
|
|
if (err) {
|
|
xenbus_dev_fatal(dev, err, "starting transaction");
|
|
goto destroy_ring;
|
|
}
|
|
|
|
if (xenbus_exists(XBT_NIL,
|
|
info->xbdev->otherend, "multi-queue-max-queues")) {
|
|
/* Write the number of queues */
|
|
err = xenbus_printf(xbt, dev->nodename,
|
|
"multi-queue-num-queues", "%u", num_queues);
|
|
if (err) {
|
|
message = "writing multi-queue-num-queues";
|
|
goto abort_transaction_no_dev_fatal;
|
|
}
|
|
}
|
|
|
|
if (num_queues == 1) {
|
|
err = write_queue_xenstore_keys(&info->queues[0], &xbt, 0); /* flat */
|
|
if (err)
|
|
goto abort_transaction_no_dev_fatal;
|
|
} else {
|
|
/* Write the keys for each queue */
|
|
for (i = 0; i < num_queues; ++i) {
|
|
queue = &info->queues[i];
|
|
err = write_queue_xenstore_keys(queue, &xbt, 1); /* hierarchical */
|
|
if (err)
|
|
goto abort_transaction_no_dev_fatal;
|
|
}
|
|
}
|
|
|
|
/* The remaining keys are not queue-specific */
|
|
err = xenbus_printf(xbt, dev->nodename, "request-rx-copy", "%u",
|
|
1);
|
|
if (err) {
|
|
message = "writing request-rx-copy";
|
|
goto abort_transaction;
|
|
}
|
|
|
|
err = xenbus_printf(xbt, dev->nodename, "feature-rx-notify", "%d", 1);
|
|
if (err) {
|
|
message = "writing feature-rx-notify";
|
|
goto abort_transaction;
|
|
}
|
|
|
|
err = xenbus_printf(xbt, dev->nodename, "feature-sg", "%d", 1);
|
|
if (err) {
|
|
message = "writing feature-sg";
|
|
goto abort_transaction;
|
|
}
|
|
|
|
err = xenbus_printf(xbt, dev->nodename, "feature-gso-tcpv4", "%d", 1);
|
|
if (err) {
|
|
message = "writing feature-gso-tcpv4";
|
|
goto abort_transaction;
|
|
}
|
|
|
|
err = xenbus_write(xbt, dev->nodename, "feature-gso-tcpv6", "1");
|
|
if (err) {
|
|
message = "writing feature-gso-tcpv6";
|
|
goto abort_transaction;
|
|
}
|
|
|
|
err = xenbus_write(xbt, dev->nodename, "feature-ipv6-csum-offload",
|
|
"1");
|
|
if (err) {
|
|
message = "writing feature-ipv6-csum-offload";
|
|
goto abort_transaction;
|
|
}
|
|
|
|
err = xenbus_transaction_end(xbt, 0);
|
|
if (err) {
|
|
if (err == -EAGAIN)
|
|
goto again;
|
|
xenbus_dev_fatal(dev, err, "completing transaction");
|
|
goto destroy_ring;
|
|
}
|
|
|
|
return 0;
|
|
|
|
abort_transaction:
|
|
xenbus_dev_fatal(dev, err, "%s", message);
|
|
abort_transaction_no_dev_fatal:
|
|
xenbus_transaction_end(xbt, 1);
|
|
destroy_ring:
|
|
xennet_disconnect_backend(info);
|
|
rtnl_lock();
|
|
xennet_destroy_queues(info);
|
|
out:
|
|
rtnl_unlock();
|
|
out_unlocked:
|
|
device_unregister(&dev->dev);
|
|
return err;
|
|
}
|
|
|
|
static int xennet_connect(struct net_device *dev)
|
|
{
|
|
struct netfront_info *np = netdev_priv(dev);
|
|
unsigned int num_queues = 0;
|
|
int err;
|
|
unsigned int j = 0;
|
|
struct netfront_queue *queue = NULL;
|
|
|
|
if (!xenbus_read_unsigned(np->xbdev->otherend, "feature-rx-copy", 0)) {
|
|
dev_info(&dev->dev,
|
|
"backend does not support copying receive path\n");
|
|
return -ENODEV;
|
|
}
|
|
|
|
err = talk_to_netback(np->xbdev, np);
|
|
if (err)
|
|
return err;
|
|
|
|
/* talk_to_netback() sets the correct number of queues */
|
|
num_queues = dev->real_num_tx_queues;
|
|
|
|
if (dev->reg_state == NETREG_UNINITIALIZED) {
|
|
err = register_netdev(dev);
|
|
if (err) {
|
|
pr_warn("%s: register_netdev err=%d\n", __func__, err);
|
|
device_unregister(&np->xbdev->dev);
|
|
return err;
|
|
}
|
|
}
|
|
|
|
rtnl_lock();
|
|
netdev_update_features(dev);
|
|
rtnl_unlock();
|
|
|
|
/*
|
|
* All public and private state should now be sane. Get
|
|
* ready to start sending and receiving packets and give the driver
|
|
* domain a kick because we've probably just requeued some
|
|
* packets.
|
|
*/
|
|
netif_carrier_on(np->netdev);
|
|
for (j = 0; j < num_queues; ++j) {
|
|
queue = &np->queues[j];
|
|
|
|
notify_remote_via_irq(queue->tx_irq);
|
|
if (queue->tx_irq != queue->rx_irq)
|
|
notify_remote_via_irq(queue->rx_irq);
|
|
|
|
spin_lock_irq(&queue->tx_lock);
|
|
xennet_tx_buf_gc(queue);
|
|
spin_unlock_irq(&queue->tx_lock);
|
|
|
|
spin_lock_bh(&queue->rx_lock);
|
|
xennet_alloc_rx_buffers(queue);
|
|
spin_unlock_bh(&queue->rx_lock);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* Callback received when the backend's state changes.
|
|
*/
|
|
static void netback_changed(struct xenbus_device *dev,
|
|
enum xenbus_state backend_state)
|
|
{
|
|
struct netfront_info *np = dev_get_drvdata(&dev->dev);
|
|
struct net_device *netdev = np->netdev;
|
|
|
|
dev_dbg(&dev->dev, "%s\n", xenbus_strstate(backend_state));
|
|
|
|
wake_up_all(&module_wq);
|
|
|
|
switch (backend_state) {
|
|
case XenbusStateInitialising:
|
|
case XenbusStateInitialised:
|
|
case XenbusStateReconfiguring:
|
|
case XenbusStateReconfigured:
|
|
case XenbusStateUnknown:
|
|
break;
|
|
|
|
case XenbusStateInitWait:
|
|
if (dev->state != XenbusStateInitialising)
|
|
break;
|
|
if (xennet_connect(netdev) != 0)
|
|
break;
|
|
xenbus_switch_state(dev, XenbusStateConnected);
|
|
break;
|
|
|
|
case XenbusStateConnected:
|
|
netdev_notify_peers(netdev);
|
|
break;
|
|
|
|
case XenbusStateClosed:
|
|
if (dev->state == XenbusStateClosed)
|
|
break;
|
|
/* Missed the backend's CLOSING state -- fallthrough */
|
|
case XenbusStateClosing:
|
|
xenbus_frontend_closed(dev);
|
|
break;
|
|
}
|
|
}
|
|
|
|
static const struct xennet_stat {
|
|
char name[ETH_GSTRING_LEN];
|
|
u16 offset;
|
|
} xennet_stats[] = {
|
|
{
|
|
"rx_gso_checksum_fixup",
|
|
offsetof(struct netfront_info, rx_gso_checksum_fixup)
|
|
},
|
|
};
|
|
|
|
static int xennet_get_sset_count(struct net_device *dev, int string_set)
|
|
{
|
|
switch (string_set) {
|
|
case ETH_SS_STATS:
|
|
return ARRAY_SIZE(xennet_stats);
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
}
|
|
|
|
static void xennet_get_ethtool_stats(struct net_device *dev,
|
|
struct ethtool_stats *stats, u64 * data)
|
|
{
|
|
void *np = netdev_priv(dev);
|
|
int i;
|
|
|
|
for (i = 0; i < ARRAY_SIZE(xennet_stats); i++)
|
|
data[i] = atomic_read((atomic_t *)(np + xennet_stats[i].offset));
|
|
}
|
|
|
|
static void xennet_get_strings(struct net_device *dev, u32 stringset, u8 * data)
|
|
{
|
|
int i;
|
|
|
|
switch (stringset) {
|
|
case ETH_SS_STATS:
|
|
for (i = 0; i < ARRAY_SIZE(xennet_stats); i++)
|
|
memcpy(data + i * ETH_GSTRING_LEN,
|
|
xennet_stats[i].name, ETH_GSTRING_LEN);
|
|
break;
|
|
}
|
|
}
|
|
|
|
static const struct ethtool_ops xennet_ethtool_ops =
|
|
{
|
|
.get_link = ethtool_op_get_link,
|
|
|
|
.get_sset_count = xennet_get_sset_count,
|
|
.get_ethtool_stats = xennet_get_ethtool_stats,
|
|
.get_strings = xennet_get_strings,
|
|
};
|
|
|
|
#ifdef CONFIG_SYSFS
|
|
static ssize_t show_rxbuf(struct device *dev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
return sprintf(buf, "%lu\n", NET_RX_RING_SIZE);
|
|
}
|
|
|
|
static ssize_t store_rxbuf(struct device *dev,
|
|
struct device_attribute *attr,
|
|
const char *buf, size_t len)
|
|
{
|
|
char *endp;
|
|
unsigned long target;
|
|
|
|
if (!capable(CAP_NET_ADMIN))
|
|
return -EPERM;
|
|
|
|
target = simple_strtoul(buf, &endp, 0);
|
|
if (endp == buf)
|
|
return -EBADMSG;
|
|
|
|
/* rxbuf_min and rxbuf_max are no longer configurable. */
|
|
|
|
return len;
|
|
}
|
|
|
|
static DEVICE_ATTR(rxbuf_min, 0644, show_rxbuf, store_rxbuf);
|
|
static DEVICE_ATTR(rxbuf_max, 0644, show_rxbuf, store_rxbuf);
|
|
static DEVICE_ATTR(rxbuf_cur, 0444, show_rxbuf, NULL);
|
|
|
|
static struct attribute *xennet_dev_attrs[] = {
|
|
&dev_attr_rxbuf_min.attr,
|
|
&dev_attr_rxbuf_max.attr,
|
|
&dev_attr_rxbuf_cur.attr,
|
|
NULL
|
|
};
|
|
|
|
static const struct attribute_group xennet_dev_group = {
|
|
.attrs = xennet_dev_attrs
|
|
};
|
|
#endif /* CONFIG_SYSFS */
|
|
|
|
static int xennet_remove(struct xenbus_device *dev)
|
|
{
|
|
struct netfront_info *info = dev_get_drvdata(&dev->dev);
|
|
|
|
dev_dbg(&dev->dev, "%s\n", dev->nodename);
|
|
|
|
if (xenbus_read_driver_state(dev->otherend) != XenbusStateClosed) {
|
|
xenbus_switch_state(dev, XenbusStateClosing);
|
|
wait_event(module_wq,
|
|
xenbus_read_driver_state(dev->otherend) ==
|
|
XenbusStateClosing ||
|
|
xenbus_read_driver_state(dev->otherend) ==
|
|
XenbusStateUnknown);
|
|
|
|
xenbus_switch_state(dev, XenbusStateClosed);
|
|
wait_event(module_wq,
|
|
xenbus_read_driver_state(dev->otherend) ==
|
|
XenbusStateClosed ||
|
|
xenbus_read_driver_state(dev->otherend) ==
|
|
XenbusStateUnknown);
|
|
}
|
|
|
|
xennet_disconnect_backend(info);
|
|
|
|
if (info->netdev->reg_state == NETREG_REGISTERED)
|
|
unregister_netdev(info->netdev);
|
|
|
|
if (info->queues) {
|
|
rtnl_lock();
|
|
xennet_destroy_queues(info);
|
|
rtnl_unlock();
|
|
}
|
|
xennet_free_netdev(info->netdev);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct xenbus_device_id netfront_ids[] = {
|
|
{ "vif" },
|
|
{ "" }
|
|
};
|
|
|
|
static struct xenbus_driver netfront_driver = {
|
|
.ids = netfront_ids,
|
|
.probe = netfront_probe,
|
|
.remove = xennet_remove,
|
|
.resume = netfront_resume,
|
|
.otherend_changed = netback_changed,
|
|
};
|
|
|
|
static int __init netif_init(void)
|
|
{
|
|
if (!xen_domain())
|
|
return -ENODEV;
|
|
|
|
if (!xen_has_pv_nic_devices())
|
|
return -ENODEV;
|
|
|
|
pr_info("Initialising Xen virtual ethernet driver\n");
|
|
|
|
/* Allow as many queues as there are CPUs inut max. 8 if user has not
|
|
* specified a value.
|
|
*/
|
|
if (xennet_max_queues == 0)
|
|
xennet_max_queues = min_t(unsigned int, MAX_QUEUES_DEFAULT,
|
|
num_online_cpus());
|
|
|
|
return xenbus_register_frontend(&netfront_driver);
|
|
}
|
|
module_init(netif_init);
|
|
|
|
|
|
static void __exit netif_exit(void)
|
|
{
|
|
xenbus_unregister_driver(&netfront_driver);
|
|
}
|
|
module_exit(netif_exit);
|
|
|
|
MODULE_DESCRIPTION("Xen virtual network device frontend");
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_ALIAS("xen:vif");
|
|
MODULE_ALIAS("xennet");
|