xen-netback: Factor queue-specific data into queue struct
In preparation for multi-queue support in xen-netback, move the queue-specific data from struct xenvif into struct xenvif_queue, and update the rest of the code to use this. Also adds loops over queues where appropriate, even though only one is configured at this point, and uses alloc_netdev_mq() and the corresponding multi-queue netif wake/start/stop functions in preparation for multiple active queues. Finally, implements a trivial queue selection function suitable for ndo_select_queue, which simply returns 0 for a single queue and uses skb_get_hash() to compute the queue index otherwise. Signed-off-by: Andrew J. Bennieston <andrew.bennieston@citrix.com> Signed-off-by: Wei Liu <wei.liu2@citrix.com> Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Wei Liu
David S. Miller
parent
a55d9766ce
commit
e9ce7cb6b1
4 changed files with 837 additions and 608 deletions
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@ -99,22 +99,43 @@ struct xenvif_rx_meta {
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*/
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#define XEN_NETBK_LEGACY_SLOTS_MAX XEN_NETIF_NR_SLOTS_MIN
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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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/* Queue name is interface name with "-qNNN" appended */
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#define QUEUE_NAME_SIZE (IFNAMSIZ + 5)
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/* Is this interface disabled? True when backend discovers
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* frontend is rogue.
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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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bool disabled;
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unsigned int rx_bytes;
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unsigned int rx_packets;
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unsigned int tx_bytes;
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unsigned int 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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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[IFNAMSIZ+4]; /* DEVNAME-tx */
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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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@ -150,7 +171,7 @@ struct xenvif {
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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[IFNAMSIZ+4]; /* DEVNAME-rx */
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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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RING_IDX rx_last_skb_slots;
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@ -165,6 +186,22 @@ struct xenvif {
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*/
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struct xenvif_rx_meta meta[XEN_NETIF_RX_RING_SIZE];
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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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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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/* Frontend feature information. */
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@ -178,19 +215,13 @@ struct xenvif {
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/* Internal feature information. */
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u8 can_queue:1; /* can queue packets for receiver? */
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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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/* 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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/* Statistics */
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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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/* Queues */
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struct xenvif_queue *queues;
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/* Miscellaneous private stuff. */
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struct net_device *dev;
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@ -205,7 +236,9 @@ 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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int xenvif_init_queue(struct xenvif_queue *queue);
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int xenvif_connect(struct xenvif_queue *queue, unsigned long tx_ring_ref,
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unsigned long rx_ring_ref, unsigned int tx_evtchn,
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unsigned int rx_evtchn);
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void xenvif_disconnect(struct xenvif *vif);
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@ -216,44 +249,47 @@ void xenvif_xenbus_fini(void);
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int xenvif_schedulable(struct xenvif *vif);
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int xenvif_must_stop_queue(struct xenvif *vif);
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int xenvif_must_stop_queue(struct xenvif_queue *queue);
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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_rings(struct xenvif *vif);
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int xenvif_map_frontend_rings(struct xenvif *vif,
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void xenvif_unmap_frontend_rings(struct xenvif_queue *queue);
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int xenvif_map_frontend_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 *vif);
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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 *vif, int budget);
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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 *vif);
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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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/* Determine whether the needed number of slots (req) are available,
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* and set req_event if not.
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*/
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bool xenvif_rx_ring_slots_available(struct xenvif *vif, int needed);
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bool xenvif_rx_ring_slots_available(struct xenvif_queue *queue, int needed);
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void xenvif_stop_queue(struct xenvif *vif);
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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 *vif, u16 pending_idx);
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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 *vif)
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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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vif->pending_prod + vif->pending_cons;
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queue->pending_prod + queue->pending_cons;
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}
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/* Callback from stack when TX packet can be released */
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@ -34,7 +34,6 @@
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#include <linux/ethtool.h>
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#include <linux/rtnetlink.h>
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#include <linux/if_vlan.h>
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#include <linux/vmalloc.h>
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#include <xen/events.h>
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#include <asm/xen/hypercall.h>
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@ -43,6 +42,16 @@
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#define XENVIF_QUEUE_LENGTH 32
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#define XENVIF_NAPI_WEIGHT 64
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static inline void xenvif_stop_queue(struct xenvif_queue *queue)
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{
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struct net_device *dev = queue->vif->dev;
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if (!queue->vif->can_queue)
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return;
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netif_tx_stop_queue(netdev_get_tx_queue(dev, queue->id));
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}
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int xenvif_schedulable(struct xenvif *vif)
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{
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return netif_running(vif->dev) && netif_carrier_ok(vif->dev);
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@ -50,33 +59,34 @@ int xenvif_schedulable(struct xenvif *vif)
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static irqreturn_t xenvif_tx_interrupt(int irq, void *dev_id)
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{
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struct xenvif *vif = dev_id;
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struct xenvif_queue *queue = dev_id;
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if (RING_HAS_UNCONSUMED_REQUESTS(&vif->tx))
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napi_schedule(&vif->napi);
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if (RING_HAS_UNCONSUMED_REQUESTS(&queue->tx))
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napi_schedule(&queue->napi);
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return IRQ_HANDLED;
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}
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static int xenvif_poll(struct napi_struct *napi, int budget)
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int xenvif_poll(struct napi_struct *napi, int budget)
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{
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struct xenvif *vif = container_of(napi, struct xenvif, napi);
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struct xenvif_queue *queue =
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container_of(napi, struct xenvif_queue, napi);
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int work_done;
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/* This vif is rogue, we pretend we've there is nothing to do
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* for this vif to deschedule it from NAPI. But this interface
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* will be turned off in thread context later.
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*/
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if (unlikely(vif->disabled)) {
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if (unlikely(queue->vif->disabled)) {
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napi_complete(napi);
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return 0;
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}
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work_done = xenvif_tx_action(vif, budget);
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work_done = xenvif_tx_action(queue, budget);
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if (work_done < budget) {
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napi_complete(napi);
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xenvif_napi_schedule_or_enable_events(vif);
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xenvif_napi_schedule_or_enable_events(queue);
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}
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return work_done;
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@ -84,9 +94,9 @@ static int xenvif_poll(struct napi_struct *napi, int budget)
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static irqreturn_t xenvif_rx_interrupt(int irq, void *dev_id)
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{
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struct xenvif *vif = dev_id;
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struct xenvif_queue *queue = dev_id;
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xenvif_kick_thread(vif);
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xenvif_kick_thread(queue);
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return IRQ_HANDLED;
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}
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@ -99,28 +109,81 @@ static irqreturn_t xenvif_interrupt(int irq, void *dev_id)
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return IRQ_HANDLED;
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}
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static void xenvif_wake_queue(unsigned long data)
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int xenvif_queue_stopped(struct xenvif_queue *queue)
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{
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struct xenvif *vif = (struct xenvif *)data;
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if (netif_queue_stopped(vif->dev)) {
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netdev_err(vif->dev, "draining TX queue\n");
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vif->rx_queue_purge = true;
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xenvif_kick_thread(vif);
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netif_wake_queue(vif->dev);
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struct net_device *dev = queue->vif->dev;
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unsigned int id = queue->id;
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return netif_tx_queue_stopped(netdev_get_tx_queue(dev, id));
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}
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void xenvif_wake_queue(struct xenvif_queue *queue)
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{
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struct net_device *dev = queue->vif->dev;
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unsigned int id = queue->id;
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netif_tx_wake_queue(netdev_get_tx_queue(dev, id));
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}
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/* Callback to wake the queue and drain it on timeout */
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static void xenvif_wake_queue_callback(unsigned long data)
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{
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struct xenvif_queue *queue = (struct xenvif_queue *)data;
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if (xenvif_queue_stopped(queue)) {
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netdev_err(queue->vif->dev, "draining TX queue\n");
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queue->rx_queue_purge = true;
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xenvif_kick_thread(queue);
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xenvif_wake_queue(queue);
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}
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}
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static u16 xenvif_select_queue(struct net_device *dev, struct sk_buff *skb,
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void *accel_priv, select_queue_fallback_t fallback)
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{
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struct xenvif *vif = netdev_priv(dev);
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unsigned int num_queues = dev->real_num_tx_queues;
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u32 hash;
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u16 queue_index;
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/* First, check if there is only one queue to optimise the
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* single-queue or old frontend scenario.
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*/
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if (num_queues == 1) {
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queue_index = 0;
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} else {
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/* Use skb_get_hash to obtain an L4 hash if available */
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hash = skb_get_hash(skb);
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queue_index = hash % num_queues;
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}
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return queue_index;
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}
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static int xenvif_start_xmit(struct sk_buff *skb, struct net_device *dev)
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{
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struct xenvif *vif = netdev_priv(dev);
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struct xenvif_queue *queue = NULL;
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unsigned int num_queues = dev->real_num_tx_queues;
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u16 index;
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int min_slots_needed;
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BUG_ON(skb->dev != dev);
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/* Drop the packet if vif is not ready */
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if (vif->task == NULL ||
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vif->dealloc_task == NULL ||
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/* Drop the packet if queues are not set up */
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if (num_queues < 1)
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goto drop;
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/* Obtain the queue to be used to transmit this packet */
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index = skb_get_queue_mapping(skb);
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if (index >= num_queues) {
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pr_warn_ratelimited("Invalid queue %hu for packet on interface %s\n.",
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index, vif->dev->name);
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index %= num_queues;
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}
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queue = &vif->queues[index];
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/* Drop the packet if queue is not ready */
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if (queue->task == NULL ||
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queue->dealloc_task == NULL ||
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!xenvif_schedulable(vif))
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goto drop;
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@ -139,16 +202,16 @@ static int xenvif_start_xmit(struct sk_buff *skb, struct net_device *dev)
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* then turn off the queue to give the ring a chance to
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* drain.
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*/
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if (!xenvif_rx_ring_slots_available(vif, min_slots_needed)) {
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vif->wake_queue.function = xenvif_wake_queue;
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vif->wake_queue.data = (unsigned long)vif;
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xenvif_stop_queue(vif);
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mod_timer(&vif->wake_queue,
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if (!xenvif_rx_ring_slots_available(queue, min_slots_needed)) {
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queue->wake_queue.function = xenvif_wake_queue_callback;
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queue->wake_queue.data = (unsigned long)queue;
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xenvif_stop_queue(queue);
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mod_timer(&queue->wake_queue,
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jiffies + rx_drain_timeout_jiffies);
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}
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skb_queue_tail(&vif->rx_queue, skb);
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xenvif_kick_thread(vif);
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skb_queue_tail(&queue->rx_queue, skb);
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xenvif_kick_thread(queue);
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return NETDEV_TX_OK;
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@ -161,25 +224,65 @@ static int xenvif_start_xmit(struct sk_buff *skb, struct net_device *dev)
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static struct net_device_stats *xenvif_get_stats(struct net_device *dev)
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{
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struct xenvif *vif = netdev_priv(dev);
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struct xenvif_queue *queue = NULL;
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unsigned int num_queues = dev->real_num_tx_queues;
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unsigned long rx_bytes = 0;
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unsigned long rx_packets = 0;
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unsigned long tx_bytes = 0;
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unsigned long tx_packets = 0;
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unsigned int index;
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if (vif->queues == NULL)
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goto out;
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/* Aggregate tx and rx stats from each queue */
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for (index = 0; index < num_queues; ++index) {
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queue = &vif->queues[index];
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rx_bytes += queue->stats.rx_bytes;
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rx_packets += queue->stats.rx_packets;
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tx_bytes += queue->stats.tx_bytes;
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tx_packets += queue->stats.tx_packets;
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}
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out:
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vif->dev->stats.rx_bytes = rx_bytes;
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vif->dev->stats.rx_packets = rx_packets;
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vif->dev->stats.tx_bytes = tx_bytes;
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vif->dev->stats.tx_packets = tx_packets;
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return &vif->dev->stats;
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}
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static void xenvif_up(struct xenvif *vif)
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{
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napi_enable(&vif->napi);
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enable_irq(vif->tx_irq);
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if (vif->tx_irq != vif->rx_irq)
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enable_irq(vif->rx_irq);
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xenvif_napi_schedule_or_enable_events(vif);
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struct xenvif_queue *queue = NULL;
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unsigned int num_queues = vif->dev->real_num_tx_queues;
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unsigned int queue_index;
|
||||
|
||||
for (queue_index = 0; queue_index < num_queues; ++queue_index) {
|
||||
queue = &vif->queues[queue_index];
|
||||
napi_enable(&queue->napi);
|
||||
enable_irq(queue->tx_irq);
|
||||
if (queue->tx_irq != queue->rx_irq)
|
||||
enable_irq(queue->rx_irq);
|
||||
xenvif_napi_schedule_or_enable_events(queue);
|
||||
}
|
||||
}
|
||||
|
||||
static void xenvif_down(struct xenvif *vif)
|
||||
{
|
||||
napi_disable(&vif->napi);
|
||||
disable_irq(vif->tx_irq);
|
||||
if (vif->tx_irq != vif->rx_irq)
|
||||
disable_irq(vif->rx_irq);
|
||||
del_timer_sync(&vif->credit_timeout);
|
||||
struct xenvif_queue *queue = NULL;
|
||||
unsigned int num_queues = vif->dev->real_num_tx_queues;
|
||||
unsigned int queue_index;
|
||||
|
||||
for (queue_index = 0; queue_index < num_queues; ++queue_index) {
|
||||
queue = &vif->queues[queue_index];
|
||||
napi_disable(&queue->napi);
|
||||
disable_irq(queue->tx_irq);
|
||||
if (queue->tx_irq != queue->rx_irq)
|
||||
disable_irq(queue->rx_irq);
|
||||
del_timer_sync(&queue->credit_timeout);
|
||||
}
|
||||
}
|
||||
|
||||
static int xenvif_open(struct net_device *dev)
|
||||
|
|
@ -187,7 +290,7 @@ static int xenvif_open(struct net_device *dev)
|
|||
struct xenvif *vif = netdev_priv(dev);
|
||||
if (netif_carrier_ok(dev))
|
||||
xenvif_up(vif);
|
||||
netif_start_queue(dev);
|
||||
netif_tx_start_all_queues(dev);
|
||||
return 0;
|
||||
}
|
||||
|
||||
|
|
@ -196,7 +299,7 @@ static int xenvif_close(struct net_device *dev)
|
|||
struct xenvif *vif = netdev_priv(dev);
|
||||
if (netif_carrier_ok(dev))
|
||||
xenvif_down(vif);
|
||||
netif_stop_queue(dev);
|
||||
netif_tx_stop_all_queues(dev);
|
||||
return 0;
|
||||
}
|
||||
|
||||
|
|
@ -236,29 +339,29 @@ static const struct xenvif_stat {
|
|||
} xenvif_stats[] = {
|
||||
{
|
||||
"rx_gso_checksum_fixup",
|
||||
offsetof(struct xenvif, rx_gso_checksum_fixup)
|
||||
offsetof(struct xenvif_stats, rx_gso_checksum_fixup)
|
||||
},
|
||||
/* If (sent != success + fail), there are probably packets never
|
||||
* freed up properly!
|
||||
*/
|
||||
{
|
||||
"tx_zerocopy_sent",
|
||||
offsetof(struct xenvif, tx_zerocopy_sent),
|
||||
offsetof(struct xenvif_stats, tx_zerocopy_sent),
|
||||
},
|
||||
{
|
||||
"tx_zerocopy_success",
|
||||
offsetof(struct xenvif, tx_zerocopy_success),
|
||||
offsetof(struct xenvif_stats, tx_zerocopy_success),
|
||||
},
|
||||
{
|
||||
"tx_zerocopy_fail",
|
||||
offsetof(struct xenvif, tx_zerocopy_fail)
|
||||
offsetof(struct xenvif_stats, tx_zerocopy_fail)
|
||||
},
|
||||
/* Number of packets exceeding MAX_SKB_FRAG slots. You should use
|
||||
* a guest with the same MAX_SKB_FRAG
|
||||
*/
|
||||
{
|
||||
"tx_frag_overflow",
|
||||
offsetof(struct xenvif, tx_frag_overflow)
|
||||
offsetof(struct xenvif_stats, tx_frag_overflow)
|
||||
},
|
||||
};
|
||||
|
||||
|
|
@ -275,11 +378,20 @@ static int xenvif_get_sset_count(struct net_device *dev, int string_set)
|
|||
static void xenvif_get_ethtool_stats(struct net_device *dev,
|
||||
struct ethtool_stats *stats, u64 * data)
|
||||
{
|
||||
void *vif = netdev_priv(dev);
|
||||
struct xenvif *vif = netdev_priv(dev);
|
||||
unsigned int num_queues = dev->real_num_tx_queues;
|
||||
int i;
|
||||
unsigned int queue_index;
|
||||
struct xenvif_stats *vif_stats;
|
||||
|
||||
for (i = 0; i < ARRAY_SIZE(xenvif_stats); i++)
|
||||
data[i] = *(unsigned long *)(vif + xenvif_stats[i].offset);
|
||||
for (i = 0; i < ARRAY_SIZE(xenvif_stats); i++) {
|
||||
unsigned long accum = 0;
|
||||
for (queue_index = 0; queue_index < num_queues; ++queue_index) {
|
||||
vif_stats = &vif->queues[queue_index].stats;
|
||||
accum += *(unsigned long *)(vif_stats + xenvif_stats[i].offset);
|
||||
}
|
||||
data[i] = accum;
|
||||
}
|
||||
}
|
||||
|
||||
static void xenvif_get_strings(struct net_device *dev, u32 stringset, u8 * data)
|
||||
|
|
@ -312,6 +424,7 @@ static const struct net_device_ops xenvif_netdev_ops = {
|
|||
.ndo_fix_features = xenvif_fix_features,
|
||||
.ndo_set_mac_address = eth_mac_addr,
|
||||
.ndo_validate_addr = eth_validate_addr,
|
||||
.ndo_select_queue = xenvif_select_queue,
|
||||
};
|
||||
|
||||
struct xenvif *xenvif_alloc(struct device *parent, domid_t domid,
|
||||
|
|
@ -321,10 +434,9 @@ struct xenvif *xenvif_alloc(struct device *parent, domid_t domid,
|
|||
struct net_device *dev;
|
||||
struct xenvif *vif;
|
||||
char name[IFNAMSIZ] = {};
|
||||
int i;
|
||||
|
||||
snprintf(name, IFNAMSIZ - 1, "vif%u.%u", domid, handle);
|
||||
dev = alloc_netdev(sizeof(struct xenvif), name, ether_setup);
|
||||
dev = alloc_netdev_mq(sizeof(struct xenvif), name, ether_setup, 1);
|
||||
if (dev == NULL) {
|
||||
pr_warn("Could not allocate netdev for %s\n", name);
|
||||
return ERR_PTR(-ENOMEM);
|
||||
|
|
@ -339,15 +451,13 @@ struct xenvif *xenvif_alloc(struct device *parent, domid_t domid,
|
|||
vif->can_sg = 1;
|
||||
vif->ip_csum = 1;
|
||||
vif->dev = dev;
|
||||
|
||||
vif->disabled = false;
|
||||
|
||||
vif->credit_bytes = vif->remaining_credit = ~0UL;
|
||||
vif->credit_usec = 0UL;
|
||||
init_timer(&vif->credit_timeout);
|
||||
vif->credit_window_start = get_jiffies_64();
|
||||
|
||||
init_timer(&vif->wake_queue);
|
||||
/* Start out with no queues. The call below does not require
|
||||
* rtnl_lock() as it happens before register_netdev().
|
||||
*/
|
||||
vif->queues = NULL;
|
||||
netif_set_real_num_tx_queues(dev, 0);
|
||||
|
||||
dev->netdev_ops = &xenvif_netdev_ops;
|
||||
dev->hw_features = NETIF_F_SG |
|
||||
|
|
@ -358,34 +468,6 @@ struct xenvif *xenvif_alloc(struct device *parent, domid_t domid,
|
|||
|
||||
dev->tx_queue_len = XENVIF_QUEUE_LENGTH;
|
||||
|
||||
skb_queue_head_init(&vif->rx_queue);
|
||||
skb_queue_head_init(&vif->tx_queue);
|
||||
|
||||
vif->pending_cons = 0;
|
||||
vif->pending_prod = MAX_PENDING_REQS;
|
||||
for (i = 0; i < MAX_PENDING_REQS; i++)
|
||||
vif->pending_ring[i] = i;
|
||||
spin_lock_init(&vif->callback_lock);
|
||||
spin_lock_init(&vif->response_lock);
|
||||
/* If ballooning is disabled, this will consume real memory, so you
|
||||
* better enable it. The long term solution would be to use just a
|
||||
* bunch of valid page descriptors, without dependency on ballooning
|
||||
*/
|
||||
err = alloc_xenballooned_pages(MAX_PENDING_REQS,
|
||||
vif->mmap_pages,
|
||||
false);
|
||||
if (err) {
|
||||
netdev_err(dev, "Could not reserve mmap_pages\n");
|
||||
return ERR_PTR(-ENOMEM);
|
||||
}
|
||||
for (i = 0; i < MAX_PENDING_REQS; i++) {
|
||||
vif->pending_tx_info[i].callback_struct = (struct ubuf_info)
|
||||
{ .callback = xenvif_zerocopy_callback,
|
||||
.ctx = NULL,
|
||||
.desc = i };
|
||||
vif->grant_tx_handle[i] = NETBACK_INVALID_HANDLE;
|
||||
}
|
||||
|
||||
/*
|
||||
* Initialise a dummy MAC address. We choose the numerically
|
||||
* largest non-broadcast address to prevent the address getting
|
||||
|
|
@ -395,8 +477,6 @@ struct xenvif *xenvif_alloc(struct device *parent, domid_t domid,
|
|||
memset(dev->dev_addr, 0xFF, ETH_ALEN);
|
||||
dev->dev_addr[0] &= ~0x01;
|
||||
|
||||
netif_napi_add(dev, &vif->napi, xenvif_poll, XENVIF_NAPI_WEIGHT);
|
||||
|
||||
netif_carrier_off(dev);
|
||||
|
||||
err = register_netdev(dev);
|
||||
|
|
@ -413,76 +493,56 @@ struct xenvif *xenvif_alloc(struct device *parent, domid_t domid,
|
|||
return vif;
|
||||
}
|
||||
|
||||
int xenvif_connect(struct xenvif *vif, unsigned long tx_ring_ref,
|
||||
unsigned long rx_ring_ref, unsigned int tx_evtchn,
|
||||
unsigned int rx_evtchn)
|
||||
int xenvif_init_queue(struct xenvif_queue *queue)
|
||||
{
|
||||
struct task_struct *task;
|
||||
int err = -ENOMEM;
|
||||
int err, i;
|
||||
|
||||
BUG_ON(vif->tx_irq);
|
||||
BUG_ON(vif->task);
|
||||
BUG_ON(vif->dealloc_task);
|
||||
queue->credit_bytes = queue->remaining_credit = ~0UL;
|
||||
queue->credit_usec = 0UL;
|
||||
init_timer(&queue->credit_timeout);
|
||||
queue->credit_window_start = get_jiffies_64();
|
||||
|
||||
err = xenvif_map_frontend_rings(vif, tx_ring_ref, rx_ring_ref);
|
||||
if (err < 0)
|
||||
goto err;
|
||||
skb_queue_head_init(&queue->rx_queue);
|
||||
skb_queue_head_init(&queue->tx_queue);
|
||||
|
||||
init_waitqueue_head(&vif->wq);
|
||||
init_waitqueue_head(&vif->dealloc_wq);
|
||||
queue->pending_cons = 0;
|
||||
queue->pending_prod = MAX_PENDING_REQS;
|
||||
for (i = 0; i < MAX_PENDING_REQS; ++i)
|
||||
queue->pending_ring[i] = i;
|
||||
|
||||
if (tx_evtchn == rx_evtchn) {
|
||||
/* feature-split-event-channels == 0 */
|
||||
err = bind_interdomain_evtchn_to_irqhandler(
|
||||
vif->domid, tx_evtchn, xenvif_interrupt, 0,
|
||||
vif->dev->name, vif);
|
||||
if (err < 0)
|
||||
goto err_unmap;
|
||||
vif->tx_irq = vif->rx_irq = err;
|
||||
disable_irq(vif->tx_irq);
|
||||
} else {
|
||||
/* feature-split-event-channels == 1 */
|
||||
snprintf(vif->tx_irq_name, sizeof(vif->tx_irq_name),
|
||||
"%s-tx", vif->dev->name);
|
||||
err = bind_interdomain_evtchn_to_irqhandler(
|
||||
vif->domid, tx_evtchn, xenvif_tx_interrupt, 0,
|
||||
vif->tx_irq_name, vif);
|
||||
if (err < 0)
|
||||
goto err_unmap;
|
||||
vif->tx_irq = err;
|
||||
disable_irq(vif->tx_irq);
|
||||
spin_lock_init(&queue->callback_lock);
|
||||
spin_lock_init(&queue->response_lock);
|
||||
|
||||
snprintf(vif->rx_irq_name, sizeof(vif->rx_irq_name),
|
||||
"%s-rx", vif->dev->name);
|
||||
err = bind_interdomain_evtchn_to_irqhandler(
|
||||
vif->domid, rx_evtchn, xenvif_rx_interrupt, 0,
|
||||
vif->rx_irq_name, vif);
|
||||
if (err < 0)
|
||||
goto err_tx_unbind;
|
||||
vif->rx_irq = err;
|
||||
disable_irq(vif->rx_irq);
|
||||
/* If ballooning is disabled, this will consume real memory, so you
|
||||
* better enable it. The long term solution would be to use just a
|
||||
* bunch of valid page descriptors, without dependency on ballooning
|
||||
*/
|
||||
err = alloc_xenballooned_pages(MAX_PENDING_REQS,
|
||||
queue->mmap_pages,
|
||||
false);
|
||||
if (err) {
|
||||
netdev_err(queue->vif->dev, "Could not reserve mmap_pages\n");
|
||||
return -ENOMEM;
|
||||
}
|
||||
|
||||
task = kthread_create(xenvif_kthread_guest_rx,
|
||||
(void *)vif, "%s-guest-rx", vif->dev->name);
|
||||
if (IS_ERR(task)) {
|
||||
pr_warn("Could not allocate kthread for %s\n", vif->dev->name);
|
||||
err = PTR_ERR(task);
|
||||
goto err_rx_unbind;
|
||||
for (i = 0; i < MAX_PENDING_REQS; i++) {
|
||||
queue->pending_tx_info[i].callback_struct = (struct ubuf_info)
|
||||
{ .callback = xenvif_zerocopy_callback,
|
||||
.ctx = NULL,
|
||||
.desc = i };
|
||||
queue->grant_tx_handle[i] = NETBACK_INVALID_HANDLE;
|
||||
}
|
||||
|
||||
vif->task = task;
|
||||
init_timer(&queue->wake_queue);
|
||||
|
||||
task = kthread_create(xenvif_dealloc_kthread,
|
||||
(void *)vif, "%s-dealloc", vif->dev->name);
|
||||
if (IS_ERR(task)) {
|
||||
pr_warn("Could not allocate kthread for %s\n", vif->dev->name);
|
||||
err = PTR_ERR(task);
|
||||
goto err_rx_unbind;
|
||||
netif_napi_add(queue->vif->dev, &queue->napi, xenvif_poll,
|
||||
XENVIF_NAPI_WEIGHT);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
vif->dealloc_task = task;
|
||||
|
||||
void xenvif_carrier_on(struct xenvif *vif)
|
||||
{
|
||||
rtnl_lock();
|
||||
if (!vif->can_sg && vif->dev->mtu > ETH_DATA_LEN)
|
||||
dev_set_mtu(vif->dev, ETH_DATA_LEN);
|
||||
|
|
@ -491,20 +551,89 @@ int xenvif_connect(struct xenvif *vif, unsigned long tx_ring_ref,
|
|||
if (netif_running(vif->dev))
|
||||
xenvif_up(vif);
|
||||
rtnl_unlock();
|
||||
}
|
||||
|
||||
wake_up_process(vif->task);
|
||||
wake_up_process(vif->dealloc_task);
|
||||
int xenvif_connect(struct xenvif_queue *queue, unsigned long tx_ring_ref,
|
||||
unsigned long rx_ring_ref, unsigned int tx_evtchn,
|
||||
unsigned int rx_evtchn)
|
||||
{
|
||||
struct task_struct *task;
|
||||
int err = -ENOMEM;
|
||||
|
||||
BUG_ON(queue->tx_irq);
|
||||
BUG_ON(queue->task);
|
||||
BUG_ON(queue->dealloc_task);
|
||||
|
||||
err = xenvif_map_frontend_rings(queue, tx_ring_ref, rx_ring_ref);
|
||||
if (err < 0)
|
||||
goto err;
|
||||
|
||||
init_waitqueue_head(&queue->wq);
|
||||
init_waitqueue_head(&queue->dealloc_wq);
|
||||
|
||||
if (tx_evtchn == rx_evtchn) {
|
||||
/* feature-split-event-channels == 0 */
|
||||
err = bind_interdomain_evtchn_to_irqhandler(
|
||||
queue->vif->domid, tx_evtchn, xenvif_interrupt, 0,
|
||||
queue->name, queue);
|
||||
if (err < 0)
|
||||
goto err_unmap;
|
||||
queue->tx_irq = queue->rx_irq = err;
|
||||
disable_irq(queue->tx_irq);
|
||||
} else {
|
||||
/* feature-split-event-channels == 1 */
|
||||
snprintf(queue->tx_irq_name, sizeof(queue->tx_irq_name),
|
||||
"%s-tx", queue->name);
|
||||
err = bind_interdomain_evtchn_to_irqhandler(
|
||||
queue->vif->domid, tx_evtchn, xenvif_tx_interrupt, 0,
|
||||
queue->tx_irq_name, queue);
|
||||
if (err < 0)
|
||||
goto err_unmap;
|
||||
queue->tx_irq = err;
|
||||
disable_irq(queue->tx_irq);
|
||||
|
||||
snprintf(queue->rx_irq_name, sizeof(queue->rx_irq_name),
|
||||
"%s-rx", queue->name);
|
||||
err = bind_interdomain_evtchn_to_irqhandler(
|
||||
queue->vif->domid, rx_evtchn, xenvif_rx_interrupt, 0,
|
||||
queue->rx_irq_name, queue);
|
||||
if (err < 0)
|
||||
goto err_tx_unbind;
|
||||
queue->rx_irq = err;
|
||||
disable_irq(queue->rx_irq);
|
||||
}
|
||||
|
||||
task = kthread_create(xenvif_kthread_guest_rx,
|
||||
(void *)queue, "%s-guest-rx", queue->name);
|
||||
if (IS_ERR(task)) {
|
||||
pr_warn("Could not allocate kthread for %s\n", queue->name);
|
||||
err = PTR_ERR(task);
|
||||
goto err_rx_unbind;
|
||||
}
|
||||
queue->task = task;
|
||||
|
||||
task = kthread_create(xenvif_dealloc_kthread,
|
||||
(void *)queue, "%s-dealloc", queue->name);
|
||||
if (IS_ERR(task)) {
|
||||
pr_warn("Could not allocate kthread for %s\n", queue->name);
|
||||
err = PTR_ERR(task);
|
||||
goto err_rx_unbind;
|
||||
}
|
||||
queue->dealloc_task = task;
|
||||
|
||||
wake_up_process(queue->task);
|
||||
wake_up_process(queue->dealloc_task);
|
||||
|
||||
return 0;
|
||||
|
||||
err_rx_unbind:
|
||||
unbind_from_irqhandler(vif->rx_irq, vif);
|
||||
vif->rx_irq = 0;
|
||||
unbind_from_irqhandler(queue->rx_irq, queue);
|
||||
queue->rx_irq = 0;
|
||||
err_tx_unbind:
|
||||
unbind_from_irqhandler(vif->tx_irq, vif);
|
||||
vif->tx_irq = 0;
|
||||
unbind_from_irqhandler(queue->tx_irq, queue);
|
||||
queue->tx_irq = 0;
|
||||
err_unmap:
|
||||
xenvif_unmap_frontend_rings(vif);
|
||||
xenvif_unmap_frontend_rings(queue);
|
||||
err:
|
||||
module_put(THIS_MODULE);
|
||||
return err;
|
||||
|
|
@ -521,38 +650,67 @@ void xenvif_carrier_off(struct xenvif *vif)
|
|||
rtnl_unlock();
|
||||
}
|
||||
|
||||
static void xenvif_wait_unmap_timeout(struct xenvif_queue *queue,
|
||||
unsigned int worst_case_skb_lifetime)
|
||||
{
|
||||
int i, unmap_timeout = 0;
|
||||
|
||||
for (i = 0; i < MAX_PENDING_REQS; ++i) {
|
||||
if (queue->grant_tx_handle[i] != NETBACK_INVALID_HANDLE) {
|
||||
unmap_timeout++;
|
||||
schedule_timeout(msecs_to_jiffies(1000));
|
||||
if (unmap_timeout > worst_case_skb_lifetime &&
|
||||
net_ratelimit())
|
||||
netdev_err(queue->vif->dev,
|
||||
"Page still granted! Index: %x\n",
|
||||
i);
|
||||
i = -1;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
void xenvif_disconnect(struct xenvif *vif)
|
||||
{
|
||||
struct xenvif_queue *queue = NULL;
|
||||
unsigned int num_queues = vif->dev->real_num_tx_queues;
|
||||
unsigned int queue_index;
|
||||
|
||||
if (netif_carrier_ok(vif->dev))
|
||||
xenvif_carrier_off(vif);
|
||||
|
||||
if (vif->task) {
|
||||
del_timer_sync(&vif->wake_queue);
|
||||
kthread_stop(vif->task);
|
||||
vif->task = NULL;
|
||||
for (queue_index = 0; queue_index < num_queues; ++queue_index) {
|
||||
queue = &vif->queues[queue_index];
|
||||
|
||||
if (queue->task) {
|
||||
del_timer_sync(&queue->wake_queue);
|
||||
kthread_stop(queue->task);
|
||||
queue->task = NULL;
|
||||
}
|
||||
|
||||
if (vif->dealloc_task) {
|
||||
kthread_stop(vif->dealloc_task);
|
||||
vif->dealloc_task = NULL;
|
||||
if (queue->dealloc_task) {
|
||||
kthread_stop(queue->dealloc_task);
|
||||
queue->dealloc_task = NULL;
|
||||
}
|
||||
|
||||
if (vif->tx_irq) {
|
||||
if (vif->tx_irq == vif->rx_irq)
|
||||
unbind_from_irqhandler(vif->tx_irq, vif);
|
||||
if (queue->tx_irq) {
|
||||
if (queue->tx_irq == queue->rx_irq)
|
||||
unbind_from_irqhandler(queue->tx_irq, queue);
|
||||
else {
|
||||
unbind_from_irqhandler(vif->tx_irq, vif);
|
||||
unbind_from_irqhandler(vif->rx_irq, vif);
|
||||
unbind_from_irqhandler(queue->tx_irq, queue);
|
||||
unbind_from_irqhandler(queue->rx_irq, queue);
|
||||
}
|
||||
vif->tx_irq = 0;
|
||||
queue->tx_irq = 0;
|
||||
}
|
||||
|
||||
xenvif_unmap_frontend_rings(vif);
|
||||
xenvif_unmap_frontend_rings(queue);
|
||||
}
|
||||
}
|
||||
|
||||
void xenvif_free(struct xenvif *vif)
|
||||
{
|
||||
int i, unmap_timeout = 0;
|
||||
struct xenvif_queue *queue = NULL;
|
||||
unsigned int num_queues = vif->dev->real_num_tx_queues;
|
||||
unsigned int queue_index;
|
||||
/* Here we want to avoid timeout messages if an skb can be legitimately
|
||||
* stuck somewhere else. Realistically this could be an another vif's
|
||||
* internal or QDisc queue. That another vif also has this
|
||||
|
|
@ -567,32 +725,24 @@ void xenvif_free(struct xenvif *vif)
|
|||
unsigned int worst_case_skb_lifetime = (rx_drain_timeout_msecs/1000) *
|
||||
DIV_ROUND_UP(XENVIF_QUEUE_LENGTH, (XEN_NETIF_RX_RING_SIZE / MAX_SKB_FRAGS));
|
||||
|
||||
for (i = 0; i < MAX_PENDING_REQS; ++i) {
|
||||
if (vif->grant_tx_handle[i] != NETBACK_INVALID_HANDLE) {
|
||||
unmap_timeout++;
|
||||
schedule_timeout(msecs_to_jiffies(1000));
|
||||
if (unmap_timeout > worst_case_skb_lifetime &&
|
||||
net_ratelimit())
|
||||
netdev_err(vif->dev,
|
||||
"Page still granted! Index: %x\n",
|
||||
i);
|
||||
/* If there are still unmapped pages, reset the loop to
|
||||
* start checking again. We shouldn't exit here until
|
||||
* dealloc thread and NAPI instance release all the
|
||||
* pages. If a kernel bug causes the skbs to stall
|
||||
* somewhere, the interface cannot be brought down
|
||||
* properly.
|
||||
*/
|
||||
i = -1;
|
||||
}
|
||||
}
|
||||
|
||||
free_xenballooned_pages(MAX_PENDING_REQS, vif->mmap_pages);
|
||||
|
||||
netif_napi_del(&vif->napi);
|
||||
|
||||
unregister_netdev(vif->dev);
|
||||
|
||||
for (queue_index = 0; queue_index < num_queues; ++queue_index) {
|
||||
queue = &vif->queues[queue_index];
|
||||
|
||||
xenvif_wait_unmap_timeout(queue, worst_case_skb_lifetime);
|
||||
free_xenballooned_pages(MAX_PENDING_REQS, queue->mmap_pages);
|
||||
|
||||
netif_napi_del(&queue->napi);
|
||||
}
|
||||
|
||||
/* Free the array of queues. The call below does not require
|
||||
* rtnl_lock() because it happens after unregister_netdev().
|
||||
*/
|
||||
netif_set_real_num_tx_queues(vif->dev, 0);
|
||||
vfree(vif->queues);
|
||||
vif->queues = NULL;
|
||||
|
||||
free_netdev(vif->dev);
|
||||
|
||||
module_put(THIS_MODULE);
|
||||
|
|
|
|||
File diff suppressed because it is too large
Load diff
|
|
@ -19,6 +19,8 @@
|
|||
*/
|
||||
|
||||
#include "common.h"
|
||||
#include <linux/vmalloc.h>
|
||||
#include <linux/rtnetlink.h>
|
||||
|
||||
struct backend_info {
|
||||
struct xenbus_device *dev;
|
||||
|
|
@ -34,8 +36,9 @@ struct backend_info {
|
|||
u8 have_hotplug_status_watch:1;
|
||||
};
|
||||
|
||||
static int connect_rings(struct backend_info *);
|
||||
static void connect(struct backend_info *);
|
||||
static int connect_rings(struct backend_info *be, struct xenvif_queue *queue);
|
||||
static void connect(struct backend_info *be);
|
||||
static int read_xenbus_vif_flags(struct backend_info *be);
|
||||
static void backend_create_xenvif(struct backend_info *be);
|
||||
static void unregister_hotplug_status_watch(struct backend_info *be);
|
||||
static void set_backend_state(struct backend_info *be,
|
||||
|
|
@ -485,10 +488,10 @@ static void connect(struct backend_info *be)
|
|||
{
|
||||
int err;
|
||||
struct xenbus_device *dev = be->dev;
|
||||
|
||||
err = connect_rings(be);
|
||||
if (err)
|
||||
return;
|
||||
unsigned long credit_bytes, credit_usec;
|
||||
unsigned int queue_index;
|
||||
unsigned int requested_num_queues = 1;
|
||||
struct xenvif_queue *queue;
|
||||
|
||||
err = xen_net_read_mac(dev, be->vif->fe_dev_addr);
|
||||
if (err) {
|
||||
|
|
@ -496,9 +499,34 @@ static void connect(struct backend_info *be)
|
|||
return;
|
||||
}
|
||||
|
||||
xen_net_read_rate(dev, &be->vif->credit_bytes,
|
||||
&be->vif->credit_usec);
|
||||
be->vif->remaining_credit = be->vif->credit_bytes;
|
||||
xen_net_read_rate(dev, &credit_bytes, &credit_usec);
|
||||
read_xenbus_vif_flags(be);
|
||||
|
||||
be->vif->queues = vzalloc(requested_num_queues *
|
||||
sizeof(struct xenvif_queue));
|
||||
rtnl_lock();
|
||||
netif_set_real_num_tx_queues(be->vif->dev, requested_num_queues);
|
||||
rtnl_unlock();
|
||||
|
||||
for (queue_index = 0; queue_index < requested_num_queues; ++queue_index) {
|
||||
queue = &be->vif->queues[queue_index];
|
||||
queue->vif = be->vif;
|
||||
queue->id = queue_index;
|
||||
snprintf(queue->name, sizeof(queue->name), "%s-q%u",
|
||||
be->vif->dev->name, queue->id);
|
||||
|
||||
err = xenvif_init_queue(queue);
|
||||
if (err)
|
||||
goto err;
|
||||
|
||||
queue->remaining_credit = credit_bytes;
|
||||
|
||||
err = connect_rings(be, queue);
|
||||
if (err)
|
||||
goto err;
|
||||
}
|
||||
|
||||
xenvif_carrier_on(be->vif);
|
||||
|
||||
unregister_hotplug_status_watch(be);
|
||||
err = xenbus_watch_pathfmt(dev, &be->hotplug_status_watch,
|
||||
|
|
@ -507,18 +535,26 @@ static void connect(struct backend_info *be)
|
|||
if (!err)
|
||||
be->have_hotplug_status_watch = 1;
|
||||
|
||||
netif_wake_queue(be->vif->dev);
|
||||
netif_tx_wake_all_queues(be->vif->dev);
|
||||
|
||||
return;
|
||||
|
||||
err:
|
||||
vfree(be->vif->queues);
|
||||
be->vif->queues = NULL;
|
||||
rtnl_lock();
|
||||
netif_set_real_num_tx_queues(be->vif->dev, 0);
|
||||
rtnl_unlock();
|
||||
return;
|
||||
}
|
||||
|
||||
|
||||
static int connect_rings(struct backend_info *be)
|
||||
static int connect_rings(struct backend_info *be, struct xenvif_queue *queue)
|
||||
{
|
||||
struct xenvif *vif = be->vif;
|
||||
struct xenbus_device *dev = be->dev;
|
||||
unsigned long tx_ring_ref, rx_ring_ref;
|
||||
unsigned int tx_evtchn, rx_evtchn, rx_copy;
|
||||
unsigned int tx_evtchn, rx_evtchn;
|
||||
int err;
|
||||
int val;
|
||||
|
||||
err = xenbus_gather(XBT_NIL, dev->otherend,
|
||||
"tx-ring-ref", "%lu", &tx_ring_ref,
|
||||
|
|
@ -546,6 +582,27 @@ static int connect_rings(struct backend_info *be)
|
|||
rx_evtchn = tx_evtchn;
|
||||
}
|
||||
|
||||
/* Map the shared frame, irq etc. */
|
||||
err = xenvif_connect(queue, tx_ring_ref, rx_ring_ref,
|
||||
tx_evtchn, rx_evtchn);
|
||||
if (err) {
|
||||
xenbus_dev_fatal(dev, err,
|
||||
"mapping shared-frames %lu/%lu port tx %u rx %u",
|
||||
tx_ring_ref, rx_ring_ref,
|
||||
tx_evtchn, rx_evtchn);
|
||||
return err;
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int read_xenbus_vif_flags(struct backend_info *be)
|
||||
{
|
||||
struct xenvif *vif = be->vif;
|
||||
struct xenbus_device *dev = be->dev;
|
||||
unsigned int rx_copy;
|
||||
int err, val;
|
||||
|
||||
err = xenbus_scanf(XBT_NIL, dev->otherend, "request-rx-copy", "%u",
|
||||
&rx_copy);
|
||||
if (err == -ENOENT) {
|
||||
|
|
@ -621,16 +678,6 @@ static int connect_rings(struct backend_info *be)
|
|||
val = 0;
|
||||
vif->ipv6_csum = !!val;
|
||||
|
||||
/* Map the shared frame, irq etc. */
|
||||
err = xenvif_connect(vif, tx_ring_ref, rx_ring_ref,
|
||||
tx_evtchn, rx_evtchn);
|
||||
if (err) {
|
||||
xenbus_dev_fatal(dev, err,
|
||||
"mapping shared-frames %lu/%lu port tx %u rx %u",
|
||||
tx_ring_ref, rx_ring_ref,
|
||||
tx_evtchn, rx_evtchn);
|
||||
return err;
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
|
||||
|
|
|
|||
Loading…
Add table
Add a link
Reference in a new issue