mirror of https://gitee.com/openkylin/linux.git
159 lines
5.2 KiB
C
159 lines
5.2 KiB
C
/*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License version 2
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* as published by the Free Software Foundation; or, when distributed
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* separately from the Linux kernel or incorporated into other
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* software packages, subject to the following license:
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this source file (the "Software"), to deal in the Software without
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* restriction, including without limitation the rights to use, copy, modify,
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* merge, publish, distribute, sublicense, and/or sell copies of the Software,
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* and to permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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* IN THE SOFTWARE.
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*/
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#ifndef __XEN_NETBACK__COMMON_H__
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#define __XEN_NETBACK__COMMON_H__
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#define pr_fmt(fmt) KBUILD_MODNAME ":%s: " fmt, __func__
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#include <linux/module.h>
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#include <linux/interrupt.h>
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#include <linux/slab.h>
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#include <linux/ip.h>
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#include <linux/in.h>
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#include <linux/io.h>
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#include <linux/netdevice.h>
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#include <linux/etherdevice.h>
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#include <linux/wait.h>
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#include <linux/sched.h>
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#include <xen/interface/io/netif.h>
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#include <xen/interface/grant_table.h>
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#include <xen/grant_table.h>
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#include <xen/xenbus.h>
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struct xen_netbk;
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struct xenvif {
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/* Unique identifier for this interface. */
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domid_t domid;
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unsigned int handle;
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/* Reference to netback processing backend. */
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struct xen_netbk *netbk;
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u8 fe_dev_addr[6];
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/* Physical parameters of the comms window. */
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grant_handle_t tx_shmem_handle;
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grant_ref_t tx_shmem_ref;
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grant_handle_t rx_shmem_handle;
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grant_ref_t rx_shmem_ref;
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unsigned int irq;
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/* List of frontends to notify after a batch of frames sent. */
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struct list_head notify_list;
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/* The shared rings and indexes. */
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struct xen_netif_tx_back_ring tx;
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struct xen_netif_rx_back_ring rx;
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struct vm_struct *tx_comms_area;
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struct vm_struct *rx_comms_area;
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/* Frontend feature information. */
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u8 can_sg:1;
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u8 gso:1;
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u8 gso_prefix:1;
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u8 csum:1;
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/* Internal feature information. */
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u8 can_queue:1; /* can queue packets for receiver? */
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/*
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* Allow xenvif_start_xmit() to peek ahead in the rx request
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* ring. This is a prediction of what rx_req_cons will be
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* once all queued skbs are put on the ring.
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*/
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RING_IDX rx_req_cons_peek;
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/* Transmit shaping: allow 'credit_bytes' every 'credit_usec'. */
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unsigned long credit_bytes;
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unsigned long credit_usec;
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unsigned long remaining_credit;
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struct timer_list credit_timeout;
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/* Statistics */
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unsigned long rx_gso_checksum_fixup;
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/* Miscellaneous private stuff. */
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struct list_head schedule_list;
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atomic_t refcnt;
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struct net_device *dev;
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wait_queue_head_t waiting_to_free;
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};
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#define XEN_NETIF_TX_RING_SIZE __CONST_RING_SIZE(xen_netif_tx, PAGE_SIZE)
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#define XEN_NETIF_RX_RING_SIZE __CONST_RING_SIZE(xen_netif_rx, PAGE_SIZE)
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struct xenvif *xenvif_alloc(struct device *parent,
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domid_t domid,
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unsigned int handle);
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int xenvif_connect(struct xenvif *vif, unsigned long tx_ring_ref,
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unsigned long rx_ring_ref, unsigned int evtchn);
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void xenvif_disconnect(struct xenvif *vif);
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void xenvif_get(struct xenvif *vif);
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void xenvif_put(struct xenvif *vif);
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int xenvif_xenbus_init(void);
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int xenvif_schedulable(struct xenvif *vif);
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int xen_netbk_rx_ring_full(struct xenvif *vif);
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int xen_netbk_must_stop_queue(struct xenvif *vif);
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/* (Un)Map communication rings. */
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void xen_netbk_unmap_frontend_rings(struct xenvif *vif);
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int xen_netbk_map_frontend_rings(struct xenvif *vif,
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grant_ref_t tx_ring_ref,
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grant_ref_t rx_ring_ref);
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/* (De)Register a xenvif with the netback backend. */
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void xen_netbk_add_xenvif(struct xenvif *vif);
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void xen_netbk_remove_xenvif(struct xenvif *vif);
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/* (De)Schedule backend processing for a xenvif */
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void xen_netbk_schedule_xenvif(struct xenvif *vif);
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void xen_netbk_deschedule_xenvif(struct xenvif *vif);
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/* Check for SKBs from frontend and schedule backend processing */
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void xen_netbk_check_rx_xenvif(struct xenvif *vif);
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/* Receive an SKB from the frontend */
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void xenvif_receive_skb(struct xenvif *vif, struct sk_buff *skb);
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/* Queue an SKB for transmission to the frontend */
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void xen_netbk_queue_tx_skb(struct xenvif *vif, struct sk_buff *skb);
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/* Notify xenvif that ring now has space to send an skb to the frontend */
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void xenvif_notify_tx_completion(struct xenvif *vif);
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/* Returns number of ring slots required to send an skb to the frontend */
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unsigned int xen_netbk_count_skb_slots(struct xenvif *vif, struct sk_buff *skb);
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#endif /* __XEN_NETBACK__COMMON_H__ */
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