454 lines
13 KiB
C
454 lines
13 KiB
C
/*
|
|
* 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.
|
|
*/
|
|
|
|
#ifndef __XEN_NETBACK__COMMON_H__
|
|
#define __XEN_NETBACK__COMMON_H__
|
|
|
|
#define pr_fmt(fmt) KBUILD_MODNAME ":%s: " fmt, __func__
|
|
|
|
#include <linux/module.h>
|
|
#include <linux/interrupt.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/ip.h>
|
|
#include <linux/in.h>
|
|
#include <linux/io.h>
|
|
#include <linux/netdevice.h>
|
|
#include <linux/etherdevice.h>
|
|
#include <linux/wait.h>
|
|
#include <linux/sched.h>
|
|
|
|
#include <xen/interface/io/netif.h>
|
|
#include <xen/interface/grant_table.h>
|
|
#include <xen/grant_table.h>
|
|
#include <xen/xenbus.h>
|
|
#include <xen/page.h>
|
|
#include <linux/debugfs.h>
|
|
|
|
typedef unsigned int pending_ring_idx_t;
|
|
#define INVALID_PENDING_RING_IDX (~0U)
|
|
|
|
struct pending_tx_info {
|
|
struct xen_netif_tx_request req; /* tx request */
|
|
unsigned int extra_count;
|
|
/* Callback data for released SKBs. The callback is always
|
|
* xenvif_zerocopy_callback, desc contains the pending_idx, which is
|
|
* also an index in pending_tx_info array. It is initialized in
|
|
* xenvif_alloc and it never changes.
|
|
* skb_shinfo(skb)->destructor_arg points to the first mapped slot's
|
|
* callback_struct in this array of struct pending_tx_info's, then ctx
|
|
* to the next, or NULL if there is no more slot for this skb.
|
|
* ubuf_to_vif is a helper which finds the struct xenvif from a pointer
|
|
* to this field.
|
|
*/
|
|
struct ubuf_info_msgzc callback_struct;
|
|
};
|
|
|
|
#define XEN_NETIF_TX_RING_SIZE __CONST_RING_SIZE(xen_netif_tx, XEN_PAGE_SIZE)
|
|
#define XEN_NETIF_RX_RING_SIZE __CONST_RING_SIZE(xen_netif_rx, XEN_PAGE_SIZE)
|
|
|
|
struct xenvif_rx_meta {
|
|
int id;
|
|
int size;
|
|
int gso_type;
|
|
int gso_size;
|
|
};
|
|
|
|
#define GSO_BIT(type) \
|
|
(1 << XEN_NETIF_GSO_TYPE_ ## type)
|
|
|
|
/* Discriminate from any valid pending_idx value. */
|
|
#define INVALID_PENDING_IDX 0xFFFF
|
|
|
|
#define MAX_BUFFER_OFFSET XEN_PAGE_SIZE
|
|
|
|
#define MAX_PENDING_REQS XEN_NETIF_TX_RING_SIZE
|
|
|
|
/* The maximum number of frags is derived from the size of a grant (same
|
|
* as a Xen page size for now).
|
|
*/
|
|
#define MAX_XEN_SKB_FRAGS (65536 / XEN_PAGE_SIZE + 1)
|
|
|
|
#define NETBACK_INVALID_HANDLE -1
|
|
|
|
/* To avoid confusion, we define XEN_NETBK_LEGACY_SLOTS_MAX indicating
|
|
* the maximum slots a valid packet can use. Now this value is defined
|
|
* to be XEN_NETIF_NR_SLOTS_MIN, which is supposed to be supported by
|
|
* all backend.
|
|
*/
|
|
#define XEN_NETBK_LEGACY_SLOTS_MAX XEN_NETIF_NR_SLOTS_MIN
|
|
|
|
/* Queue name is interface name with "-qNNN" appended */
|
|
#define QUEUE_NAME_SIZE (IFNAMSIZ + 5)
|
|
|
|
/* IRQ name is queue name with "-tx" or "-rx" appended */
|
|
#define IRQ_NAME_SIZE (QUEUE_NAME_SIZE + 3)
|
|
|
|
struct xenvif;
|
|
|
|
struct xenvif_stats {
|
|
/* Stats fields to be updated per-queue.
|
|
* A subset of struct net_device_stats that contains only the
|
|
* fields that are updated in netback.c for each queue.
|
|
*/
|
|
u64 rx_bytes;
|
|
u64 rx_packets;
|
|
u64 tx_bytes;
|
|
u64 tx_packets;
|
|
|
|
/* Additional stats used by xenvif */
|
|
unsigned long rx_gso_checksum_fixup;
|
|
unsigned long tx_zerocopy_sent;
|
|
unsigned long tx_zerocopy_success;
|
|
unsigned long tx_zerocopy_fail;
|
|
unsigned long tx_frag_overflow;
|
|
};
|
|
|
|
#define COPY_BATCH_SIZE 64
|
|
|
|
struct xenvif_copy_state {
|
|
struct gnttab_copy op[COPY_BATCH_SIZE];
|
|
RING_IDX idx[COPY_BATCH_SIZE];
|
|
unsigned int num;
|
|
struct sk_buff_head *completed;
|
|
};
|
|
|
|
struct xenvif_queue { /* Per-queue data for xenvif */
|
|
unsigned int id; /* Queue ID, 0-based */
|
|
char name[QUEUE_NAME_SIZE]; /* DEVNAME-qN */
|
|
struct xenvif *vif; /* Parent VIF */
|
|
|
|
/*
|
|
* TX/RX common EOI handling.
|
|
* When feature-split-event-channels = 0, interrupt handler sets
|
|
* NETBK_COMMON_EOI, otherwise NETBK_RX_EOI and NETBK_TX_EOI are set
|
|
* by the RX and TX interrupt handlers.
|
|
* RX and TX handler threads will issue an EOI when either
|
|
* NETBK_COMMON_EOI or their specific bits (NETBK_RX_EOI or
|
|
* NETBK_TX_EOI) are set and they will reset those bits.
|
|
*/
|
|
atomic_t eoi_pending;
|
|
#define NETBK_RX_EOI 0x01
|
|
#define NETBK_TX_EOI 0x02
|
|
#define NETBK_COMMON_EOI 0x04
|
|
|
|
/* Use NAPI for guest TX */
|
|
struct napi_struct napi;
|
|
/* When feature-split-event-channels = 0, tx_irq = rx_irq. */
|
|
unsigned int tx_irq;
|
|
/* Only used when feature-split-event-channels = 1 */
|
|
char tx_irq_name[IRQ_NAME_SIZE]; /* DEVNAME-qN-tx */
|
|
struct xen_netif_tx_back_ring tx;
|
|
struct sk_buff_head tx_queue;
|
|
struct page *mmap_pages[MAX_PENDING_REQS];
|
|
pending_ring_idx_t pending_prod;
|
|
pending_ring_idx_t pending_cons;
|
|
u16 pending_ring[MAX_PENDING_REQS];
|
|
struct pending_tx_info pending_tx_info[MAX_PENDING_REQS];
|
|
grant_handle_t grant_tx_handle[MAX_PENDING_REQS];
|
|
|
|
struct gnttab_copy tx_copy_ops[MAX_PENDING_REQS];
|
|
struct gnttab_map_grant_ref tx_map_ops[MAX_PENDING_REQS];
|
|
struct gnttab_unmap_grant_ref tx_unmap_ops[MAX_PENDING_REQS];
|
|
/* passed to gnttab_[un]map_refs with pages under (un)mapping */
|
|
struct page *pages_to_map[MAX_PENDING_REQS];
|
|
struct page *pages_to_unmap[MAX_PENDING_REQS];
|
|
|
|
/* This prevents zerocopy callbacks to race over dealloc_ring */
|
|
spinlock_t callback_lock;
|
|
/* This prevents dealloc thread and NAPI instance to race over response
|
|
* creation and pending_ring in xenvif_idx_release. In xenvif_tx_err
|
|
* it only protect response creation
|
|
*/
|
|
spinlock_t response_lock;
|
|
pending_ring_idx_t dealloc_prod;
|
|
pending_ring_idx_t dealloc_cons;
|
|
u16 dealloc_ring[MAX_PENDING_REQS];
|
|
struct task_struct *dealloc_task;
|
|
wait_queue_head_t dealloc_wq;
|
|
atomic_t inflight_packets;
|
|
|
|
/* Use kthread for guest RX */
|
|
struct task_struct *task;
|
|
wait_queue_head_t wq;
|
|
/* When feature-split-event-channels = 0, tx_irq = rx_irq. */
|
|
unsigned int rx_irq;
|
|
/* Only used when feature-split-event-channels = 1 */
|
|
char rx_irq_name[IRQ_NAME_SIZE]; /* DEVNAME-qN-rx */
|
|
struct xen_netif_rx_back_ring rx;
|
|
struct sk_buff_head rx_queue;
|
|
|
|
unsigned int rx_queue_max;
|
|
unsigned int rx_queue_len;
|
|
unsigned long last_rx_time;
|
|
bool stalled;
|
|
|
|
struct xenvif_copy_state rx_copy;
|
|
|
|
/* Transmit shaping: allow 'credit_bytes' every 'credit_usec'. */
|
|
unsigned long credit_bytes;
|
|
unsigned long credit_usec;
|
|
unsigned long remaining_credit;
|
|
struct timer_list credit_timeout;
|
|
u64 credit_window_start;
|
|
bool rate_limited;
|
|
|
|
/* Statistics */
|
|
struct xenvif_stats stats;
|
|
};
|
|
|
|
enum state_bit_shift {
|
|
/* This bit marks that the vif is connected */
|
|
VIF_STATUS_CONNECTED,
|
|
};
|
|
|
|
struct xenvif_mcast_addr {
|
|
struct list_head entry;
|
|
struct rcu_head rcu;
|
|
u8 addr[6];
|
|
};
|
|
|
|
#define XEN_NETBK_MCAST_MAX 64
|
|
|
|
#define XEN_NETBK_MAX_HASH_KEY_SIZE 40
|
|
#define XEN_NETBK_MAX_HASH_MAPPING_SIZE 128
|
|
#define XEN_NETBK_HASH_TAG_SIZE 40
|
|
|
|
struct xenvif_hash_cache_entry {
|
|
struct list_head link;
|
|
struct rcu_head rcu;
|
|
u8 tag[XEN_NETBK_HASH_TAG_SIZE];
|
|
unsigned int len;
|
|
u32 val;
|
|
int seq;
|
|
};
|
|
|
|
struct xenvif_hash_cache {
|
|
spinlock_t lock;
|
|
struct list_head list;
|
|
unsigned int count;
|
|
atomic_t seq;
|
|
};
|
|
|
|
struct xenvif_hash {
|
|
unsigned int alg;
|
|
u32 flags;
|
|
bool mapping_sel;
|
|
u8 key[XEN_NETBK_MAX_HASH_KEY_SIZE];
|
|
u32 mapping[2][XEN_NETBK_MAX_HASH_MAPPING_SIZE];
|
|
unsigned int size;
|
|
struct xenvif_hash_cache cache;
|
|
};
|
|
|
|
struct backend_info {
|
|
struct xenbus_device *dev;
|
|
struct xenvif *vif;
|
|
|
|
/* This is the state that will be reflected in xenstore when any
|
|
* active hotplug script completes.
|
|
*/
|
|
enum xenbus_state state;
|
|
|
|
enum xenbus_state frontend_state;
|
|
struct xenbus_watch hotplug_status_watch;
|
|
u8 have_hotplug_status_watch:1;
|
|
|
|
const char *hotplug_script;
|
|
};
|
|
|
|
struct xenvif {
|
|
/* Unique identifier for this interface. */
|
|
domid_t domid;
|
|
unsigned int handle;
|
|
|
|
u8 fe_dev_addr[6];
|
|
struct list_head fe_mcast_addr;
|
|
unsigned int fe_mcast_count;
|
|
|
|
/* Frontend feature information. */
|
|
int gso_mask;
|
|
|
|
u8 can_sg:1;
|
|
u8 ip_csum:1;
|
|
u8 ipv6_csum:1;
|
|
u8 multicast_control:1;
|
|
|
|
/* headroom requested by xen-netfront */
|
|
u16 xdp_headroom;
|
|
|
|
/* Is this interface disabled? True when backend discovers
|
|
* frontend is rogue.
|
|
*/
|
|
bool disabled;
|
|
unsigned long status;
|
|
unsigned long drain_timeout;
|
|
unsigned long stall_timeout;
|
|
|
|
/* Queues */
|
|
struct xenvif_queue *queues;
|
|
unsigned int num_queues; /* active queues, resource allocated */
|
|
unsigned int stalled_queues;
|
|
|
|
struct xenvif_hash hash;
|
|
|
|
struct xenbus_watch credit_watch;
|
|
struct xenbus_watch mcast_ctrl_watch;
|
|
|
|
struct backend_info *be;
|
|
|
|
spinlock_t lock;
|
|
|
|
#ifdef CONFIG_DEBUG_FS
|
|
struct dentry *xenvif_dbg_root;
|
|
#endif
|
|
|
|
struct xen_netif_ctrl_back_ring ctrl;
|
|
unsigned int ctrl_irq;
|
|
|
|
/* Miscellaneous private stuff. */
|
|
struct net_device *dev;
|
|
};
|
|
|
|
struct xenvif_rx_cb {
|
|
unsigned long expires;
|
|
int meta_slots_used;
|
|
};
|
|
|
|
#define XENVIF_RX_CB(skb) ((struct xenvif_rx_cb *)(skb)->cb)
|
|
|
|
static inline struct xenbus_device *xenvif_to_xenbus_device(struct xenvif *vif)
|
|
{
|
|
return to_xenbus_device(vif->dev->dev.parent);
|
|
}
|
|
|
|
void xenvif_tx_credit_callback(struct timer_list *t);
|
|
|
|
struct xenvif *xenvif_alloc(struct device *parent,
|
|
domid_t domid,
|
|
unsigned int handle);
|
|
|
|
int xenvif_init_queue(struct xenvif_queue *queue);
|
|
void xenvif_deinit_queue(struct xenvif_queue *queue);
|
|
|
|
int xenvif_connect_data(struct xenvif_queue *queue,
|
|
unsigned long tx_ring_ref,
|
|
unsigned long rx_ring_ref,
|
|
unsigned int tx_evtchn,
|
|
unsigned int rx_evtchn);
|
|
void xenvif_disconnect_data(struct xenvif *vif);
|
|
int xenvif_connect_ctrl(struct xenvif *vif, grant_ref_t ring_ref,
|
|
unsigned int evtchn);
|
|
void xenvif_disconnect_ctrl(struct xenvif *vif);
|
|
void xenvif_free(struct xenvif *vif);
|
|
|
|
int xenvif_xenbus_init(void);
|
|
void xenvif_xenbus_fini(void);
|
|
|
|
int xenvif_schedulable(struct xenvif *vif);
|
|
|
|
int xenvif_queue_stopped(struct xenvif_queue *queue);
|
|
void xenvif_wake_queue(struct xenvif_queue *queue);
|
|
|
|
/* (Un)Map communication rings. */
|
|
void xenvif_unmap_frontend_data_rings(struct xenvif_queue *queue);
|
|
int xenvif_map_frontend_data_rings(struct xenvif_queue *queue,
|
|
grant_ref_t tx_ring_ref,
|
|
grant_ref_t rx_ring_ref);
|
|
|
|
/* Check for SKBs from frontend and schedule backend processing */
|
|
void xenvif_napi_schedule_or_enable_events(struct xenvif_queue *queue);
|
|
|
|
/* Prevent the device from generating any further traffic. */
|
|
void xenvif_carrier_off(struct xenvif *vif);
|
|
|
|
int xenvif_tx_action(struct xenvif_queue *queue, int budget);
|
|
|
|
int xenvif_kthread_guest_rx(void *data);
|
|
void xenvif_kick_thread(struct xenvif_queue *queue);
|
|
|
|
int xenvif_dealloc_kthread(void *data);
|
|
|
|
irqreturn_t xenvif_ctrl_irq_fn(int irq, void *data);
|
|
|
|
bool xenvif_have_rx_work(struct xenvif_queue *queue, bool test_kthread);
|
|
void xenvif_rx_action(struct xenvif_queue *queue);
|
|
void xenvif_rx_queue_tail(struct xenvif_queue *queue, struct sk_buff *skb);
|
|
|
|
void xenvif_carrier_on(struct xenvif *vif);
|
|
|
|
/* Callbacks from stack when TX packet can be released */
|
|
extern const struct ubuf_info_ops xenvif_ubuf_ops;
|
|
|
|
/* Unmap a pending page and release it back to the guest */
|
|
void xenvif_idx_unmap(struct xenvif_queue *queue, u16 pending_idx);
|
|
|
|
static inline pending_ring_idx_t nr_pending_reqs(struct xenvif_queue *queue)
|
|
{
|
|
return MAX_PENDING_REQS -
|
|
queue->pending_prod + queue->pending_cons;
|
|
}
|
|
|
|
irqreturn_t xenvif_interrupt(int irq, void *dev_id);
|
|
|
|
extern bool separate_tx_rx_irq;
|
|
extern bool provides_xdp_headroom;
|
|
|
|
extern unsigned int rx_drain_timeout_msecs;
|
|
extern unsigned int rx_stall_timeout_msecs;
|
|
extern unsigned int xenvif_max_queues;
|
|
extern unsigned int xenvif_hash_cache_size;
|
|
|
|
#ifdef CONFIG_DEBUG_FS
|
|
extern struct dentry *xen_netback_dbg_root;
|
|
#endif
|
|
|
|
void xenvif_skb_zerocopy_prepare(struct xenvif_queue *queue,
|
|
struct sk_buff *skb);
|
|
void xenvif_skb_zerocopy_complete(struct xenvif_queue *queue);
|
|
|
|
/* Multicast control */
|
|
bool xenvif_mcast_match(struct xenvif *vif, const u8 *addr);
|
|
void xenvif_mcast_addr_list_free(struct xenvif *vif);
|
|
|
|
/* Hash */
|
|
void xenvif_init_hash(struct xenvif *vif);
|
|
void xenvif_deinit_hash(struct xenvif *vif);
|
|
|
|
u32 xenvif_set_hash_alg(struct xenvif *vif, u32 alg);
|
|
u32 xenvif_get_hash_flags(struct xenvif *vif, u32 *flags);
|
|
u32 xenvif_set_hash_flags(struct xenvif *vif, u32 flags);
|
|
u32 xenvif_set_hash_key(struct xenvif *vif, u32 gref, u32 len);
|
|
u32 xenvif_set_hash_mapping_size(struct xenvif *vif, u32 size);
|
|
u32 xenvif_set_hash_mapping(struct xenvif *vif, u32 gref, u32 len,
|
|
u32 off);
|
|
|
|
void xenvif_set_skb_hash(struct xenvif *vif, struct sk_buff *skb);
|
|
|
|
#ifdef CONFIG_DEBUG_FS
|
|
void xenvif_dump_hash_info(struct xenvif *vif, struct seq_file *m);
|
|
#endif
|
|
|
|
#endif /* __XEN_NETBACK__COMMON_H__ */
|