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