e1f00a69ec
Netback and netfront only use one event channel to do TX / RX notification, which may cause unnecessary wake-up of processing routines. This patch adds a new feature called feature-split-event-channels to netback, enabling it to handle TX and RX events separately. Netback will use tx_irq to notify guest for TX completion, rx_irq for RX notification. If frontend doesn't support this feature, tx_irq equals to rx_irq. Signed-off-by: Wei Liu <wei.liu2@citrix.com> Signed-off-by: David S. Miller <davem@davemloft.net>
168 lines
5.5 KiB
C
168 lines
5.5 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>
|
|
|
|
struct xen_netbk;
|
|
|
|
struct xenvif {
|
|
/* Unique identifier for this interface. */
|
|
domid_t domid;
|
|
unsigned int handle;
|
|
|
|
/* Reference to netback processing backend. */
|
|
struct xen_netbk *netbk;
|
|
|
|
u8 fe_dev_addr[6];
|
|
|
|
/* When feature-split-event-channels = 0, tx_irq = rx_irq. */
|
|
unsigned int tx_irq;
|
|
unsigned int rx_irq;
|
|
/* Only used when feature-split-event-channels = 1 */
|
|
char tx_irq_name[IFNAMSIZ+4]; /* DEVNAME-tx */
|
|
char rx_irq_name[IFNAMSIZ+4]; /* DEVNAME-rx */
|
|
|
|
/* List of frontends to notify after a batch of frames sent. */
|
|
struct list_head notify_list;
|
|
|
|
/* The shared rings and indexes. */
|
|
struct xen_netif_tx_back_ring tx;
|
|
struct xen_netif_rx_back_ring rx;
|
|
|
|
/* Frontend feature information. */
|
|
u8 can_sg:1;
|
|
u8 gso:1;
|
|
u8 gso_prefix:1;
|
|
u8 csum:1;
|
|
|
|
/* Internal feature information. */
|
|
u8 can_queue:1; /* can queue packets for receiver? */
|
|
|
|
/*
|
|
* Allow xenvif_start_xmit() to peek ahead in the rx request
|
|
* ring. This is a prediction of what rx_req_cons will be
|
|
* once all queued skbs are put on the ring.
|
|
*/
|
|
RING_IDX rx_req_cons_peek;
|
|
|
|
/* 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;
|
|
|
|
/* Statistics */
|
|
unsigned long rx_gso_checksum_fixup;
|
|
|
|
/* Miscellaneous private stuff. */
|
|
struct list_head schedule_list;
|
|
atomic_t refcnt;
|
|
struct net_device *dev;
|
|
|
|
wait_queue_head_t waiting_to_free;
|
|
};
|
|
|
|
static inline struct xenbus_device *xenvif_to_xenbus_device(struct xenvif *vif)
|
|
{
|
|
return to_xenbus_device(vif->dev->dev.parent);
|
|
}
|
|
|
|
#define XEN_NETIF_TX_RING_SIZE __CONST_RING_SIZE(xen_netif_tx, PAGE_SIZE)
|
|
#define XEN_NETIF_RX_RING_SIZE __CONST_RING_SIZE(xen_netif_rx, PAGE_SIZE)
|
|
|
|
struct xenvif *xenvif_alloc(struct device *parent,
|
|
domid_t domid,
|
|
unsigned int handle);
|
|
|
|
int xenvif_connect(struct xenvif *vif, unsigned long tx_ring_ref,
|
|
unsigned long rx_ring_ref, unsigned int tx_evtchn,
|
|
unsigned int rx_evtchn);
|
|
void xenvif_disconnect(struct xenvif *vif);
|
|
|
|
void xenvif_get(struct xenvif *vif);
|
|
void xenvif_put(struct xenvif *vif);
|
|
|
|
int xenvif_xenbus_init(void);
|
|
void xenvif_xenbus_fini(void);
|
|
|
|
int xenvif_schedulable(struct xenvif *vif);
|
|
|
|
int xen_netbk_rx_ring_full(struct xenvif *vif);
|
|
|
|
int xen_netbk_must_stop_queue(struct xenvif *vif);
|
|
|
|
/* (Un)Map communication rings. */
|
|
void xen_netbk_unmap_frontend_rings(struct xenvif *vif);
|
|
int xen_netbk_map_frontend_rings(struct xenvif *vif,
|
|
grant_ref_t tx_ring_ref,
|
|
grant_ref_t rx_ring_ref);
|
|
|
|
/* (De)Register a xenvif with the netback backend. */
|
|
void xen_netbk_add_xenvif(struct xenvif *vif);
|
|
void xen_netbk_remove_xenvif(struct xenvif *vif);
|
|
|
|
/* (De)Schedule backend processing for a xenvif */
|
|
void xen_netbk_schedule_xenvif(struct xenvif *vif);
|
|
void xen_netbk_deschedule_xenvif(struct xenvif *vif);
|
|
|
|
/* Check for SKBs from frontend and schedule backend processing */
|
|
void xen_netbk_check_rx_xenvif(struct xenvif *vif);
|
|
/* Receive an SKB from the frontend */
|
|
void xenvif_receive_skb(struct xenvif *vif, struct sk_buff *skb);
|
|
|
|
/* Queue an SKB for transmission to the frontend */
|
|
void xen_netbk_queue_tx_skb(struct xenvif *vif, struct sk_buff *skb);
|
|
/* Notify xenvif that ring now has space to send an skb to the frontend */
|
|
void xenvif_notify_tx_completion(struct xenvif *vif);
|
|
|
|
/* Prevent the device from generating any further traffic. */
|
|
void xenvif_carrier_off(struct xenvif *vif);
|
|
|
|
/* Returns number of ring slots required to send an skb to the frontend */
|
|
unsigned int xen_netbk_count_skb_slots(struct xenvif *vif, struct sk_buff *skb);
|
|
|
|
extern bool separate_tx_rx_irq;
|
|
|
|
#endif /* __XEN_NETBACK__COMMON_H__ */
|