|
|
@@ -106,13 +106,6 @@ static void push_tx_responses(struct xenvif_queue *queue);
|
|
|
|
|
|
static inline int tx_work_todo(struct xenvif_queue *queue);
|
|
|
|
|
|
-static struct xen_netif_rx_response *make_rx_response(struct xenvif_queue *queue,
|
|
|
- u16 id,
|
|
|
- s8 st,
|
|
|
- u16 offset,
|
|
|
- u16 size,
|
|
|
- u16 flags);
|
|
|
-
|
|
|
static inline unsigned long idx_to_pfn(struct xenvif_queue *queue,
|
|
|
u16 idx)
|
|
|
{
|
|
|
@@ -155,571 +148,11 @@ static inline pending_ring_idx_t pending_index(unsigned i)
|
|
|
return i & (MAX_PENDING_REQS-1);
|
|
|
}
|
|
|
|
|
|
-static bool xenvif_rx_ring_slots_available(struct xenvif_queue *queue)
|
|
|
-{
|
|
|
- RING_IDX prod, cons;
|
|
|
- struct sk_buff *skb;
|
|
|
- int needed;
|
|
|
-
|
|
|
- skb = skb_peek(&queue->rx_queue);
|
|
|
- if (!skb)
|
|
|
- return false;
|
|
|
-
|
|
|
- needed = DIV_ROUND_UP(skb->len, XEN_PAGE_SIZE);
|
|
|
- if (skb_is_gso(skb))
|
|
|
- needed++;
|
|
|
- if (skb->sw_hash)
|
|
|
- needed++;
|
|
|
-
|
|
|
- do {
|
|
|
- prod = queue->rx.sring->req_prod;
|
|
|
- cons = queue->rx.req_cons;
|
|
|
-
|
|
|
- if (prod - cons >= needed)
|
|
|
- return true;
|
|
|
-
|
|
|
- queue->rx.sring->req_event = prod + 1;
|
|
|
-
|
|
|
- /* Make sure event is visible before we check prod
|
|
|
- * again.
|
|
|
- */
|
|
|
- mb();
|
|
|
- } while (queue->rx.sring->req_prod != prod);
|
|
|
-
|
|
|
- return false;
|
|
|
-}
|
|
|
-
|
|
|
-void xenvif_rx_queue_tail(struct xenvif_queue *queue, struct sk_buff *skb)
|
|
|
-{
|
|
|
- unsigned long flags;
|
|
|
-
|
|
|
- spin_lock_irqsave(&queue->rx_queue.lock, flags);
|
|
|
-
|
|
|
- __skb_queue_tail(&queue->rx_queue, skb);
|
|
|
-
|
|
|
- queue->rx_queue_len += skb->len;
|
|
|
- if (queue->rx_queue_len > queue->rx_queue_max)
|
|
|
- netif_tx_stop_queue(netdev_get_tx_queue(queue->vif->dev, queue->id));
|
|
|
-
|
|
|
- spin_unlock_irqrestore(&queue->rx_queue.lock, flags);
|
|
|
-}
|
|
|
-
|
|
|
-static struct sk_buff *xenvif_rx_dequeue(struct xenvif_queue *queue)
|
|
|
-{
|
|
|
- struct sk_buff *skb;
|
|
|
-
|
|
|
- spin_lock_irq(&queue->rx_queue.lock);
|
|
|
-
|
|
|
- skb = __skb_dequeue(&queue->rx_queue);
|
|
|
- if (skb)
|
|
|
- queue->rx_queue_len -= skb->len;
|
|
|
-
|
|
|
- spin_unlock_irq(&queue->rx_queue.lock);
|
|
|
-
|
|
|
- return skb;
|
|
|
-}
|
|
|
-
|
|
|
-static void xenvif_rx_queue_maybe_wake(struct xenvif_queue *queue)
|
|
|
-{
|
|
|
- spin_lock_irq(&queue->rx_queue.lock);
|
|
|
-
|
|
|
- if (queue->rx_queue_len < queue->rx_queue_max)
|
|
|
- netif_tx_wake_queue(netdev_get_tx_queue(queue->vif->dev, queue->id));
|
|
|
-
|
|
|
- spin_unlock_irq(&queue->rx_queue.lock);
|
|
|
-}
|
|
|
-
|
|
|
-
|
|
|
-static void xenvif_rx_queue_purge(struct xenvif_queue *queue)
|
|
|
-{
|
|
|
- struct sk_buff *skb;
|
|
|
- while ((skb = xenvif_rx_dequeue(queue)) != NULL)
|
|
|
- kfree_skb(skb);
|
|
|
-}
|
|
|
-
|
|
|
-static void xenvif_rx_queue_drop_expired(struct xenvif_queue *queue)
|
|
|
-{
|
|
|
- struct sk_buff *skb;
|
|
|
-
|
|
|
- for(;;) {
|
|
|
- skb = skb_peek(&queue->rx_queue);
|
|
|
- if (!skb)
|
|
|
- break;
|
|
|
- if (time_before(jiffies, XENVIF_RX_CB(skb)->expires))
|
|
|
- break;
|
|
|
- xenvif_rx_dequeue(queue);
|
|
|
- kfree_skb(skb);
|
|
|
- }
|
|
|
-}
|
|
|
-
|
|
|
-struct netrx_pending_operations {
|
|
|
- unsigned copy_prod, copy_cons;
|
|
|
- unsigned meta_prod, meta_cons;
|
|
|
- struct gnttab_copy *copy;
|
|
|
- struct xenvif_rx_meta *meta;
|
|
|
- int copy_off;
|
|
|
- grant_ref_t copy_gref;
|
|
|
-};
|
|
|
-
|
|
|
-static struct xenvif_rx_meta *get_next_rx_buffer(struct xenvif_queue *queue,
|
|
|
- struct netrx_pending_operations *npo)
|
|
|
-{
|
|
|
- struct xenvif_rx_meta *meta;
|
|
|
- struct xen_netif_rx_request req;
|
|
|
-
|
|
|
- RING_COPY_REQUEST(&queue->rx, queue->rx.req_cons++, &req);
|
|
|
-
|
|
|
- meta = npo->meta + npo->meta_prod++;
|
|
|
- meta->gso_type = XEN_NETIF_GSO_TYPE_NONE;
|
|
|
- meta->gso_size = 0;
|
|
|
- meta->size = 0;
|
|
|
- meta->id = req.id;
|
|
|
-
|
|
|
- npo->copy_off = 0;
|
|
|
- npo->copy_gref = req.gref;
|
|
|
-
|
|
|
- return meta;
|
|
|
-}
|
|
|
-
|
|
|
-struct gop_frag_copy {
|
|
|
- struct xenvif_queue *queue;
|
|
|
- struct netrx_pending_operations *npo;
|
|
|
- struct xenvif_rx_meta *meta;
|
|
|
- int head;
|
|
|
- int gso_type;
|
|
|
- int protocol;
|
|
|
- int hash_present;
|
|
|
-
|
|
|
- struct page *page;
|
|
|
-};
|
|
|
-
|
|
|
-static void xenvif_setup_copy_gop(unsigned long gfn,
|
|
|
- unsigned int offset,
|
|
|
- unsigned int *len,
|
|
|
- struct gop_frag_copy *info)
|
|
|
-{
|
|
|
- struct gnttab_copy *copy_gop;
|
|
|
- struct xen_page_foreign *foreign;
|
|
|
- /* Convenient aliases */
|
|
|
- struct xenvif_queue *queue = info->queue;
|
|
|
- struct netrx_pending_operations *npo = info->npo;
|
|
|
- struct page *page = info->page;
|
|
|
-
|
|
|
- BUG_ON(npo->copy_off > MAX_BUFFER_OFFSET);
|
|
|
-
|
|
|
- if (npo->copy_off == MAX_BUFFER_OFFSET)
|
|
|
- info->meta = get_next_rx_buffer(queue, npo);
|
|
|
-
|
|
|
- if (npo->copy_off + *len > MAX_BUFFER_OFFSET)
|
|
|
- *len = MAX_BUFFER_OFFSET - npo->copy_off;
|
|
|
-
|
|
|
- copy_gop = npo->copy + npo->copy_prod++;
|
|
|
- copy_gop->flags = GNTCOPY_dest_gref;
|
|
|
- copy_gop->len = *len;
|
|
|
-
|
|
|
- foreign = xen_page_foreign(page);
|
|
|
- if (foreign) {
|
|
|
- copy_gop->source.domid = foreign->domid;
|
|
|
- copy_gop->source.u.ref = foreign->gref;
|
|
|
- copy_gop->flags |= GNTCOPY_source_gref;
|
|
|
- } else {
|
|
|
- copy_gop->source.domid = DOMID_SELF;
|
|
|
- copy_gop->source.u.gmfn = gfn;
|
|
|
- }
|
|
|
- copy_gop->source.offset = offset;
|
|
|
-
|
|
|
- copy_gop->dest.domid = queue->vif->domid;
|
|
|
- copy_gop->dest.offset = npo->copy_off;
|
|
|
- copy_gop->dest.u.ref = npo->copy_gref;
|
|
|
-
|
|
|
- npo->copy_off += *len;
|
|
|
- info->meta->size += *len;
|
|
|
-
|
|
|
- if (!info->head)
|
|
|
- return;
|
|
|
-
|
|
|
- /* Leave a gap for the GSO descriptor. */
|
|
|
- if ((1 << info->gso_type) & queue->vif->gso_mask)
|
|
|
- queue->rx.req_cons++;
|
|
|
-
|
|
|
- /* Leave a gap for the hash extra segment. */
|
|
|
- if (info->hash_present)
|
|
|
- queue->rx.req_cons++;
|
|
|
-
|
|
|
- info->head = 0; /* There must be something in this buffer now */
|
|
|
-}
|
|
|
-
|
|
|
-static void xenvif_gop_frag_copy_grant(unsigned long gfn,
|
|
|
- unsigned offset,
|
|
|
- unsigned int len,
|
|
|
- void *data)
|
|
|
-{
|
|
|
- unsigned int bytes;
|
|
|
-
|
|
|
- while (len) {
|
|
|
- bytes = len;
|
|
|
- xenvif_setup_copy_gop(gfn, offset, &bytes, data);
|
|
|
- offset += bytes;
|
|
|
- len -= bytes;
|
|
|
- }
|
|
|
-}
|
|
|
-
|
|
|
-/*
|
|
|
- * Set up the grant operations for this fragment. If it's a flipping
|
|
|
- * interface, we also set up the unmap request from here.
|
|
|
- */
|
|
|
-static void xenvif_gop_frag_copy(struct xenvif_queue *queue, struct sk_buff *skb,
|
|
|
- struct netrx_pending_operations *npo,
|
|
|
- struct page *page, unsigned long size,
|
|
|
- unsigned long offset, int *head)
|
|
|
-{
|
|
|
- struct gop_frag_copy info = {
|
|
|
- .queue = queue,
|
|
|
- .npo = npo,
|
|
|
- .head = *head,
|
|
|
- .gso_type = XEN_NETIF_GSO_TYPE_NONE,
|
|
|
- /* xenvif_set_skb_hash() will have either set a s/w
|
|
|
- * hash or cleared the hash depending on
|
|
|
- * whether the the frontend wants a hash for this skb.
|
|
|
- */
|
|
|
- .hash_present = skb->sw_hash,
|
|
|
- };
|
|
|
- unsigned long bytes;
|
|
|
-
|
|
|
- if (skb_is_gso(skb)) {
|
|
|
- if (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV4)
|
|
|
- info.gso_type = XEN_NETIF_GSO_TYPE_TCPV4;
|
|
|
- else if (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV6)
|
|
|
- info.gso_type = XEN_NETIF_GSO_TYPE_TCPV6;
|
|
|
- }
|
|
|
-
|
|
|
- /* Data must not cross a page boundary. */
|
|
|
- BUG_ON(size + offset > PAGE_SIZE<<compound_order(page));
|
|
|
-
|
|
|
- info.meta = npo->meta + npo->meta_prod - 1;
|
|
|
-
|
|
|
- /* Skip unused frames from start of page */
|
|
|
- page += offset >> PAGE_SHIFT;
|
|
|
- offset &= ~PAGE_MASK;
|
|
|
-
|
|
|
- while (size > 0) {
|
|
|
- BUG_ON(offset >= PAGE_SIZE);
|
|
|
-
|
|
|
- bytes = PAGE_SIZE - offset;
|
|
|
- if (bytes > size)
|
|
|
- bytes = size;
|
|
|
-
|
|
|
- info.page = page;
|
|
|
- gnttab_foreach_grant_in_range(page, offset, bytes,
|
|
|
- xenvif_gop_frag_copy_grant,
|
|
|
- &info);
|
|
|
- size -= bytes;
|
|
|
- offset = 0;
|
|
|
-
|
|
|
- /* Next page */
|
|
|
- if (size) {
|
|
|
- BUG_ON(!PageCompound(page));
|
|
|
- page++;
|
|
|
- }
|
|
|
- }
|
|
|
-
|
|
|
- *head = info.head;
|
|
|
-}
|
|
|
-
|
|
|
-/*
|
|
|
- * Prepare an SKB to be transmitted to the frontend.
|
|
|
- *
|
|
|
- * This function is responsible for allocating grant operations, meta
|
|
|
- * structures, etc.
|
|
|
- *
|
|
|
- * It returns the number of meta structures consumed. The number of
|
|
|
- * ring slots used is always equal to the number of meta slots used
|
|
|
- * plus the number of GSO descriptors used. Currently, we use either
|
|
|
- * zero GSO descriptors (for non-GSO packets) or one descriptor (for
|
|
|
- * frontend-side LRO).
|
|
|
- */
|
|
|
-static int xenvif_gop_skb(struct sk_buff *skb,
|
|
|
- struct netrx_pending_operations *npo,
|
|
|
- struct xenvif_queue *queue)
|
|
|
-{
|
|
|
- struct xenvif *vif = netdev_priv(skb->dev);
|
|
|
- int nr_frags = skb_shinfo(skb)->nr_frags;
|
|
|
- int i;
|
|
|
- struct xen_netif_rx_request req;
|
|
|
- struct xenvif_rx_meta *meta;
|
|
|
- unsigned char *data;
|
|
|
- int head = 1;
|
|
|
- int old_meta_prod;
|
|
|
- int gso_type;
|
|
|
-
|
|
|
- old_meta_prod = npo->meta_prod;
|
|
|
-
|
|
|
- gso_type = XEN_NETIF_GSO_TYPE_NONE;
|
|
|
- if (skb_is_gso(skb)) {
|
|
|
- if (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV4)
|
|
|
- gso_type = XEN_NETIF_GSO_TYPE_TCPV4;
|
|
|
- else if (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV6)
|
|
|
- gso_type = XEN_NETIF_GSO_TYPE_TCPV6;
|
|
|
- }
|
|
|
-
|
|
|
- /* Set up a GSO prefix descriptor, if necessary */
|
|
|
- if ((1 << gso_type) & vif->gso_prefix_mask) {
|
|
|
- RING_COPY_REQUEST(&queue->rx, queue->rx.req_cons++, &req);
|
|
|
- meta = npo->meta + npo->meta_prod++;
|
|
|
- meta->gso_type = gso_type;
|
|
|
- meta->gso_size = skb_shinfo(skb)->gso_size;
|
|
|
- meta->size = 0;
|
|
|
- meta->id = req.id;
|
|
|
- }
|
|
|
-
|
|
|
- RING_COPY_REQUEST(&queue->rx, queue->rx.req_cons++, &req);
|
|
|
- meta = npo->meta + npo->meta_prod++;
|
|
|
-
|
|
|
- if ((1 << gso_type) & vif->gso_mask) {
|
|
|
- meta->gso_type = gso_type;
|
|
|
- meta->gso_size = skb_shinfo(skb)->gso_size;
|
|
|
- } else {
|
|
|
- meta->gso_type = XEN_NETIF_GSO_TYPE_NONE;
|
|
|
- meta->gso_size = 0;
|
|
|
- }
|
|
|
-
|
|
|
- meta->size = 0;
|
|
|
- meta->id = req.id;
|
|
|
- npo->copy_off = 0;
|
|
|
- npo->copy_gref = req.gref;
|
|
|
-
|
|
|
- data = skb->data;
|
|
|
- while (data < skb_tail_pointer(skb)) {
|
|
|
- unsigned int offset = offset_in_page(data);
|
|
|
- unsigned int len = PAGE_SIZE - offset;
|
|
|
-
|
|
|
- if (data + len > skb_tail_pointer(skb))
|
|
|
- len = skb_tail_pointer(skb) - data;
|
|
|
-
|
|
|
- xenvif_gop_frag_copy(queue, skb, npo,
|
|
|
- virt_to_page(data), len, offset, &head);
|
|
|
- data += len;
|
|
|
- }
|
|
|
-
|
|
|
- for (i = 0; i < nr_frags; i++) {
|
|
|
- xenvif_gop_frag_copy(queue, skb, npo,
|
|
|
- skb_frag_page(&skb_shinfo(skb)->frags[i]),
|
|
|
- skb_frag_size(&skb_shinfo(skb)->frags[i]),
|
|
|
- skb_shinfo(skb)->frags[i].page_offset,
|
|
|
- &head);
|
|
|
- }
|
|
|
-
|
|
|
- return npo->meta_prod - old_meta_prod;
|
|
|
-}
|
|
|
-
|
|
|
-/*
|
|
|
- * This is a twin to xenvif_gop_skb. Assume that xenvif_gop_skb was
|
|
|
- * used to set up the operations on the top of
|
|
|
- * netrx_pending_operations, which have since been done. Check that
|
|
|
- * they didn't give any errors and advance over them.
|
|
|
- */
|
|
|
-static int xenvif_check_gop(struct xenvif *vif, int nr_meta_slots,
|
|
|
- struct netrx_pending_operations *npo)
|
|
|
-{
|
|
|
- struct gnttab_copy *copy_op;
|
|
|
- int status = XEN_NETIF_RSP_OKAY;
|
|
|
- int i;
|
|
|
-
|
|
|
- for (i = 0; i < nr_meta_slots; i++) {
|
|
|
- copy_op = npo->copy + npo->copy_cons++;
|
|
|
- if (copy_op->status != GNTST_okay) {
|
|
|
- netdev_dbg(vif->dev,
|
|
|
- "Bad status %d from copy to DOM%d.\n",
|
|
|
- copy_op->status, vif->domid);
|
|
|
- status = XEN_NETIF_RSP_ERROR;
|
|
|
- }
|
|
|
- }
|
|
|
-
|
|
|
- return status;
|
|
|
-}
|
|
|
-
|
|
|
-static void xenvif_add_frag_responses(struct xenvif_queue *queue, int status,
|
|
|
- struct xenvif_rx_meta *meta,
|
|
|
- int nr_meta_slots)
|
|
|
-{
|
|
|
- int i;
|
|
|
- unsigned long offset;
|
|
|
-
|
|
|
- /* No fragments used */
|
|
|
- if (nr_meta_slots <= 1)
|
|
|
- return;
|
|
|
-
|
|
|
- nr_meta_slots--;
|
|
|
-
|
|
|
- for (i = 0; i < nr_meta_slots; i++) {
|
|
|
- int flags;
|
|
|
- if (i == nr_meta_slots - 1)
|
|
|
- flags = 0;
|
|
|
- else
|
|
|
- flags = XEN_NETRXF_more_data;
|
|
|
-
|
|
|
- offset = 0;
|
|
|
- make_rx_response(queue, meta[i].id, status, offset,
|
|
|
- meta[i].size, flags);
|
|
|
- }
|
|
|
-}
|
|
|
-
|
|
|
void xenvif_kick_thread(struct xenvif_queue *queue)
|
|
|
{
|
|
|
wake_up(&queue->wq);
|
|
|
}
|
|
|
|
|
|
-static void xenvif_rx_action(struct xenvif_queue *queue)
|
|
|
-{
|
|
|
- struct xenvif *vif = queue->vif;
|
|
|
- s8 status;
|
|
|
- u16 flags;
|
|
|
- struct xen_netif_rx_response *resp;
|
|
|
- struct sk_buff_head rxq;
|
|
|
- struct sk_buff *skb;
|
|
|
- LIST_HEAD(notify);
|
|
|
- int ret;
|
|
|
- unsigned long offset;
|
|
|
- bool need_to_notify = false;
|
|
|
-
|
|
|
- struct netrx_pending_operations npo = {
|
|
|
- .copy = queue->grant_copy_op,
|
|
|
- .meta = queue->meta,
|
|
|
- };
|
|
|
-
|
|
|
- skb_queue_head_init(&rxq);
|
|
|
-
|
|
|
- while (xenvif_rx_ring_slots_available(queue)
|
|
|
- && (skb = xenvif_rx_dequeue(queue)) != NULL) {
|
|
|
- queue->last_rx_time = jiffies;
|
|
|
-
|
|
|
- XENVIF_RX_CB(skb)->meta_slots_used = xenvif_gop_skb(skb, &npo, queue);
|
|
|
-
|
|
|
- __skb_queue_tail(&rxq, skb);
|
|
|
- }
|
|
|
-
|
|
|
- BUG_ON(npo.meta_prod > ARRAY_SIZE(queue->meta));
|
|
|
-
|
|
|
- if (!npo.copy_prod)
|
|
|
- goto done;
|
|
|
-
|
|
|
- BUG_ON(npo.copy_prod > MAX_GRANT_COPY_OPS);
|
|
|
- gnttab_batch_copy(queue->grant_copy_op, npo.copy_prod);
|
|
|
-
|
|
|
- while ((skb = __skb_dequeue(&rxq)) != NULL) {
|
|
|
- struct xen_netif_extra_info *extra = NULL;
|
|
|
-
|
|
|
- if ((1 << queue->meta[npo.meta_cons].gso_type) &
|
|
|
- vif->gso_prefix_mask) {
|
|
|
- resp = RING_GET_RESPONSE(&queue->rx,
|
|
|
- queue->rx.rsp_prod_pvt++);
|
|
|
-
|
|
|
- resp->flags = XEN_NETRXF_gso_prefix | XEN_NETRXF_more_data;
|
|
|
-
|
|
|
- resp->offset = queue->meta[npo.meta_cons].gso_size;
|
|
|
- resp->id = queue->meta[npo.meta_cons].id;
|
|
|
- resp->status = XENVIF_RX_CB(skb)->meta_slots_used;
|
|
|
-
|
|
|
- npo.meta_cons++;
|
|
|
- XENVIF_RX_CB(skb)->meta_slots_used--;
|
|
|
- }
|
|
|
-
|
|
|
-
|
|
|
- queue->stats.tx_bytes += skb->len;
|
|
|
- queue->stats.tx_packets++;
|
|
|
-
|
|
|
- status = xenvif_check_gop(vif,
|
|
|
- XENVIF_RX_CB(skb)->meta_slots_used,
|
|
|
- &npo);
|
|
|
-
|
|
|
- if (XENVIF_RX_CB(skb)->meta_slots_used == 1)
|
|
|
- flags = 0;
|
|
|
- else
|
|
|
- flags = XEN_NETRXF_more_data;
|
|
|
-
|
|
|
- if (skb->ip_summed == CHECKSUM_PARTIAL) /* local packet? */
|
|
|
- flags |= XEN_NETRXF_csum_blank | XEN_NETRXF_data_validated;
|
|
|
- else if (skb->ip_summed == CHECKSUM_UNNECESSARY)
|
|
|
- /* remote but checksummed. */
|
|
|
- flags |= XEN_NETRXF_data_validated;
|
|
|
-
|
|
|
- offset = 0;
|
|
|
- resp = make_rx_response(queue, queue->meta[npo.meta_cons].id,
|
|
|
- status, offset,
|
|
|
- queue->meta[npo.meta_cons].size,
|
|
|
- flags);
|
|
|
-
|
|
|
- if ((1 << queue->meta[npo.meta_cons].gso_type) &
|
|
|
- vif->gso_mask) {
|
|
|
- extra = (struct xen_netif_extra_info *)
|
|
|
- RING_GET_RESPONSE(&queue->rx,
|
|
|
- queue->rx.rsp_prod_pvt++);
|
|
|
-
|
|
|
- resp->flags |= XEN_NETRXF_extra_info;
|
|
|
-
|
|
|
- extra->u.gso.type = queue->meta[npo.meta_cons].gso_type;
|
|
|
- extra->u.gso.size = queue->meta[npo.meta_cons].gso_size;
|
|
|
- extra->u.gso.pad = 0;
|
|
|
- extra->u.gso.features = 0;
|
|
|
-
|
|
|
- extra->type = XEN_NETIF_EXTRA_TYPE_GSO;
|
|
|
- extra->flags = 0;
|
|
|
- }
|
|
|
-
|
|
|
- if (skb->sw_hash) {
|
|
|
- /* Since the skb got here via xenvif_select_queue()
|
|
|
- * we know that the hash has been re-calculated
|
|
|
- * according to a configuration set by the frontend
|
|
|
- * and therefore we know that it is legitimate to
|
|
|
- * pass it to the frontend.
|
|
|
- */
|
|
|
- if (resp->flags & XEN_NETRXF_extra_info)
|
|
|
- extra->flags |= XEN_NETIF_EXTRA_FLAG_MORE;
|
|
|
- else
|
|
|
- resp->flags |= XEN_NETRXF_extra_info;
|
|
|
-
|
|
|
- extra = (struct xen_netif_extra_info *)
|
|
|
- RING_GET_RESPONSE(&queue->rx,
|
|
|
- queue->rx.rsp_prod_pvt++);
|
|
|
-
|
|
|
- extra->u.hash.algorithm =
|
|
|
- XEN_NETIF_CTRL_HASH_ALGORITHM_TOEPLITZ;
|
|
|
-
|
|
|
- if (skb->l4_hash)
|
|
|
- extra->u.hash.type =
|
|
|
- skb->protocol == htons(ETH_P_IP) ?
|
|
|
- _XEN_NETIF_CTRL_HASH_TYPE_IPV4_TCP :
|
|
|
- _XEN_NETIF_CTRL_HASH_TYPE_IPV6_TCP;
|
|
|
- else
|
|
|
- extra->u.hash.type =
|
|
|
- skb->protocol == htons(ETH_P_IP) ?
|
|
|
- _XEN_NETIF_CTRL_HASH_TYPE_IPV4 :
|
|
|
- _XEN_NETIF_CTRL_HASH_TYPE_IPV6;
|
|
|
-
|
|
|
- *(uint32_t *)extra->u.hash.value =
|
|
|
- skb_get_hash_raw(skb);
|
|
|
-
|
|
|
- extra->type = XEN_NETIF_EXTRA_TYPE_HASH;
|
|
|
- extra->flags = 0;
|
|
|
- }
|
|
|
-
|
|
|
- xenvif_add_frag_responses(queue, status,
|
|
|
- queue->meta + npo.meta_cons + 1,
|
|
|
- XENVIF_RX_CB(skb)->meta_slots_used);
|
|
|
-
|
|
|
- RING_PUSH_RESPONSES_AND_CHECK_NOTIFY(&queue->rx, ret);
|
|
|
-
|
|
|
- need_to_notify |= !!ret;
|
|
|
-
|
|
|
- npo.meta_cons += XENVIF_RX_CB(skb)->meta_slots_used;
|
|
|
- dev_kfree_skb(skb);
|
|
|
- }
|
|
|
-
|
|
|
-done:
|
|
|
- if (need_to_notify)
|
|
|
- notify_remote_via_irq(queue->rx_irq);
|
|
|
-}
|
|
|
-
|
|
|
void xenvif_napi_schedule_or_enable_events(struct xenvif_queue *queue)
|
|
|
{
|
|
|
int more_to_do;
|
|
|
@@ -1951,29 +1384,6 @@ static void push_tx_responses(struct xenvif_queue *queue)
|
|
|
notify_remote_via_irq(queue->tx_irq);
|
|
|
}
|
|
|
|
|
|
-static struct xen_netif_rx_response *make_rx_response(struct xenvif_queue *queue,
|
|
|
- u16 id,
|
|
|
- s8 st,
|
|
|
- u16 offset,
|
|
|
- u16 size,
|
|
|
- u16 flags)
|
|
|
-{
|
|
|
- RING_IDX i = queue->rx.rsp_prod_pvt;
|
|
|
- struct xen_netif_rx_response *resp;
|
|
|
-
|
|
|
- resp = RING_GET_RESPONSE(&queue->rx, i);
|
|
|
- resp->offset = offset;
|
|
|
- resp->flags = flags;
|
|
|
- resp->id = id;
|
|
|
- resp->status = (s16)size;
|
|
|
- if (st < 0)
|
|
|
- resp->status = (s16)st;
|
|
|
-
|
|
|
- queue->rx.rsp_prod_pvt = ++i;
|
|
|
-
|
|
|
- return resp;
|
|
|
-}
|
|
|
-
|
|
|
void xenvif_idx_unmap(struct xenvif_queue *queue, u16 pending_idx)
|
|
|
{
|
|
|
int ret;
|
|
|
@@ -2055,170 +1465,6 @@ err:
|
|
|
return err;
|
|
|
}
|
|
|
|
|
|
-static void xenvif_queue_carrier_off(struct xenvif_queue *queue)
|
|
|
-{
|
|
|
- struct xenvif *vif = queue->vif;
|
|
|
-
|
|
|
- queue->stalled = true;
|
|
|
-
|
|
|
- /* At least one queue has stalled? Disable the carrier. */
|
|
|
- spin_lock(&vif->lock);
|
|
|
- if (vif->stalled_queues++ == 0) {
|
|
|
- netdev_info(vif->dev, "Guest Rx stalled");
|
|
|
- netif_carrier_off(vif->dev);
|
|
|
- }
|
|
|
- spin_unlock(&vif->lock);
|
|
|
-}
|
|
|
-
|
|
|
-static void xenvif_queue_carrier_on(struct xenvif_queue *queue)
|
|
|
-{
|
|
|
- struct xenvif *vif = queue->vif;
|
|
|
-
|
|
|
- queue->last_rx_time = jiffies; /* Reset Rx stall detection. */
|
|
|
- queue->stalled = false;
|
|
|
-
|
|
|
- /* All queues are ready? Enable the carrier. */
|
|
|
- spin_lock(&vif->lock);
|
|
|
- if (--vif->stalled_queues == 0) {
|
|
|
- netdev_info(vif->dev, "Guest Rx ready");
|
|
|
- netif_carrier_on(vif->dev);
|
|
|
- }
|
|
|
- spin_unlock(&vif->lock);
|
|
|
-}
|
|
|
-
|
|
|
-static bool xenvif_rx_queue_stalled(struct xenvif_queue *queue)
|
|
|
-{
|
|
|
- RING_IDX prod, cons;
|
|
|
-
|
|
|
- prod = queue->rx.sring->req_prod;
|
|
|
- cons = queue->rx.req_cons;
|
|
|
-
|
|
|
- return !queue->stalled && prod - cons < 1
|
|
|
- && time_after(jiffies,
|
|
|
- queue->last_rx_time + queue->vif->stall_timeout);
|
|
|
-}
|
|
|
-
|
|
|
-static bool xenvif_rx_queue_ready(struct xenvif_queue *queue)
|
|
|
-{
|
|
|
- RING_IDX prod, cons;
|
|
|
-
|
|
|
- prod = queue->rx.sring->req_prod;
|
|
|
- cons = queue->rx.req_cons;
|
|
|
-
|
|
|
- return queue->stalled && prod - cons >= 1;
|
|
|
-}
|
|
|
-
|
|
|
-static bool xenvif_have_rx_work(struct xenvif_queue *queue)
|
|
|
-{
|
|
|
- return xenvif_rx_ring_slots_available(queue)
|
|
|
- || (queue->vif->stall_timeout &&
|
|
|
- (xenvif_rx_queue_stalled(queue)
|
|
|
- || xenvif_rx_queue_ready(queue)))
|
|
|
- || kthread_should_stop()
|
|
|
- || queue->vif->disabled;
|
|
|
-}
|
|
|
-
|
|
|
-static long xenvif_rx_queue_timeout(struct xenvif_queue *queue)
|
|
|
-{
|
|
|
- struct sk_buff *skb;
|
|
|
- long timeout;
|
|
|
-
|
|
|
- skb = skb_peek(&queue->rx_queue);
|
|
|
- if (!skb)
|
|
|
- return MAX_SCHEDULE_TIMEOUT;
|
|
|
-
|
|
|
- timeout = XENVIF_RX_CB(skb)->expires - jiffies;
|
|
|
- return timeout < 0 ? 0 : timeout;
|
|
|
-}
|
|
|
-
|
|
|
-/* Wait until the guest Rx thread has work.
|
|
|
- *
|
|
|
- * The timeout needs to be adjusted based on the current head of the
|
|
|
- * queue (and not just the head at the beginning). In particular, if
|
|
|
- * the queue is initially empty an infinite timeout is used and this
|
|
|
- * needs to be reduced when a skb is queued.
|
|
|
- *
|
|
|
- * This cannot be done with wait_event_timeout() because it only
|
|
|
- * calculates the timeout once.
|
|
|
- */
|
|
|
-static void xenvif_wait_for_rx_work(struct xenvif_queue *queue)
|
|
|
-{
|
|
|
- DEFINE_WAIT(wait);
|
|
|
-
|
|
|
- if (xenvif_have_rx_work(queue))
|
|
|
- return;
|
|
|
-
|
|
|
- for (;;) {
|
|
|
- long ret;
|
|
|
-
|
|
|
- prepare_to_wait(&queue->wq, &wait, TASK_INTERRUPTIBLE);
|
|
|
- if (xenvif_have_rx_work(queue))
|
|
|
- break;
|
|
|
- ret = schedule_timeout(xenvif_rx_queue_timeout(queue));
|
|
|
- if (!ret)
|
|
|
- break;
|
|
|
- }
|
|
|
- finish_wait(&queue->wq, &wait);
|
|
|
-}
|
|
|
-
|
|
|
-int xenvif_kthread_guest_rx(void *data)
|
|
|
-{
|
|
|
- struct xenvif_queue *queue = data;
|
|
|
- struct xenvif *vif = queue->vif;
|
|
|
-
|
|
|
- if (!vif->stall_timeout)
|
|
|
- xenvif_queue_carrier_on(queue);
|
|
|
-
|
|
|
- for (;;) {
|
|
|
- xenvif_wait_for_rx_work(queue);
|
|
|
-
|
|
|
- if (kthread_should_stop())
|
|
|
- break;
|
|
|
-
|
|
|
- /* This frontend is found to be rogue, disable it in
|
|
|
- * kthread context. Currently this is only set when
|
|
|
- * netback finds out frontend sends malformed packet,
|
|
|
- * but we cannot disable the interface in softirq
|
|
|
- * context so we defer it here, if this thread is
|
|
|
- * associated with queue 0.
|
|
|
- */
|
|
|
- if (unlikely(vif->disabled && queue->id == 0)) {
|
|
|
- xenvif_carrier_off(vif);
|
|
|
- break;
|
|
|
- }
|
|
|
-
|
|
|
- if (!skb_queue_empty(&queue->rx_queue))
|
|
|
- xenvif_rx_action(queue);
|
|
|
-
|
|
|
- /* If the guest hasn't provided any Rx slots for a
|
|
|
- * while it's probably not responsive, drop the
|
|
|
- * carrier so packets are dropped earlier.
|
|
|
- */
|
|
|
- if (vif->stall_timeout) {
|
|
|
- if (xenvif_rx_queue_stalled(queue))
|
|
|
- xenvif_queue_carrier_off(queue);
|
|
|
- else if (xenvif_rx_queue_ready(queue))
|
|
|
- xenvif_queue_carrier_on(queue);
|
|
|
- }
|
|
|
-
|
|
|
- /* Queued packets may have foreign pages from other
|
|
|
- * domains. These cannot be queued indefinitely as
|
|
|
- * this would starve guests of grant refs and transmit
|
|
|
- * slots.
|
|
|
- */
|
|
|
- xenvif_rx_queue_drop_expired(queue);
|
|
|
-
|
|
|
- xenvif_rx_queue_maybe_wake(queue);
|
|
|
-
|
|
|
- cond_resched();
|
|
|
- }
|
|
|
-
|
|
|
- /* Bin any remaining skbs */
|
|
|
- xenvif_rx_queue_purge(queue);
|
|
|
-
|
|
|
- return 0;
|
|
|
-}
|
|
|
-
|
|
|
static bool xenvif_dealloc_kthread_should_stop(struct xenvif_queue *queue)
|
|
|
{
|
|
|
/* Dealloc thread must remain running until all inflight
|
David S. Miller