![Mart van Santen](/assets/img/avatar_default.png)
This patch fixes an issue where the type of counters in the queue(s) and interface are not in sync (queue counters are int, interface counters are long), causing incorrect reporting of tx/rx values of the vif interface and unclear counter overflows. This patch sets both counters to the u64 type. Signed-off-by: Mart van Santen <mart@greenhost.nl> Reviewed-by: Paul Durrant <paul.durrant@citrix.com> Signed-off-by: David S. Miller <davem@davemloft.net>
415 lines
12 KiB
C
415 lines
12 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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/* 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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u8 key[XEN_NETBK_MAX_HASH_KEY_SIZE];
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u32 mapping[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 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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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(unsigned long data);
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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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