static int xenvif_read_io_ring(struct seq_file *m, void *v)
{
struct xenvif_queue *queue = m->private;
struct xen_netif_tx_back_ring *tx_ring = &queue->tx;
struct xen_netif_rx_back_ring *rx_ring = &queue->rx;
struct netdev_queue *dev_queue;
if (tx_ring->sring) {
struct xen_netif_tx_sring *sring = tx_ring->sring;
seq_printf(m, "Queue %d\nTX: nr_ents %u\n", queue->id,
tx_ring->nr_ents);
seq_printf(m, "req prod %u (%d) cons %u (%d) event %u (%d)\n",
sring->req_prod,
sring->req_prod - sring->rsp_prod,
tx_ring->req_cons,
tx_ring->req_cons - sring->rsp_prod,
sring->req_event,
sring->req_event - sring->rsp_prod);
seq_printf(m, "rsp prod %u (base) pvt %u (%d) event %u (%d)\n",
sring->rsp_prod,
tx_ring->rsp_prod_pvt,
tx_ring->rsp_prod_pvt - sring->rsp_prod,
sring->rsp_event,
sring->rsp_event - sring->rsp_prod);
seq_printf(m, "pending prod %u pending cons %u nr_pending_reqs %u\n",
queue->pending_prod,
queue->pending_cons,
nr_pending_reqs(queue));
seq_printf(m, "dealloc prod %u dealloc cons %u dealloc_queue %u\n\n",
queue->dealloc_prod,
queue->dealloc_cons,
queue->dealloc_prod - queue->dealloc_cons);
}
if (rx_ring->sring) {
struct xen_netif_rx_sring *sring = rx_ring->sring;
seq_printf(m, "RX: nr_ents %u\n", rx_ring->nr_ents);
seq_printf(m, "req prod %u (%d) cons %u (%d) event %u (%d)\n",
sring->req_prod,
sring->req_prod - sring->rsp_prod,
rx_ring->req_cons,
rx_ring->req_cons - sring->rsp_prod,
sring->req_event,
sring->req_event - sring->rsp_prod);
seq_printf(m, "rsp prod %u (base) pvt %u (%d) event %u (%d)\n\n",
sring->rsp_prod,
rx_ring->rsp_prod_pvt,
rx_ring->rsp_prod_pvt - sring->rsp_prod,
sring->rsp_event,
sring->rsp_event - sring->rsp_prod);
}
seq_printf(m, "NAPI state: %lx NAPI weight: %d TX queue len %u\n"
"Credit timer_pending: %d, credit: %lu, usec: %lu\n"
"remaining: %lu, expires: %lu, now: %lu\n",
queue->napi.state, queue->napi.weight,
skb_queue_len(&queue->tx_queue),
timer_pending(&queue->credit_timeout),
queue->credit_bytes,
queue->credit_usec,
queue->remaining_credit,
queue->credit_timeout.expires,
jiffies);
dev_queue = netdev_get_tx_queue(queue->vif->dev, queue->id);
seq_printf(m, "\nRx internal queue: len %u max %u pkts %u %s\n",
queue->rx_queue_len, queue->rx_queue_max,
skb_queue_len(&queue->rx_queue),
netif_tx_queue_stopped(dev_queue) ? "stopped" : "running");
return 0;
}
static unsigned xenvif_tx_build_gops(struct xenvif *vif, int budget)
{
struct gnttab_copy *gop = vif->tx_copy_ops, *request_gop;
struct sk_buff *skb;
int ret;
while ((nr_pending_reqs(vif) + XEN_NETBK_LEGACY_SLOTS_MAX
< MAX_PENDING_REQS) &&
(skb_queue_len(&vif->tx_queue) < budget)) {
struct xen_netif_tx_request txreq;
struct xen_netif_tx_request txfrags[XEN_NETBK_LEGACY_SLOTS_MAX];
struct page *page;
struct xen_netif_extra_info extras[XEN_NETIF_EXTRA_TYPE_MAX-1];
u16 pending_idx;
RING_IDX idx;
int work_to_do;
unsigned int data_len;
pending_ring_idx_t index;
if (vif->tx.sring->req_prod - vif->tx.req_cons >
XEN_NETIF_TX_RING_SIZE) {
netdev_err(vif->dev,
"Impossible number of requests. "
"req_prod %d, req_cons %d, size %ld\n",
vif->tx.sring->req_prod, vif->tx.req_cons,
XEN_NETIF_TX_RING_SIZE);
xenvif_fatal_tx_err(vif);
continue;
}
work_to_do = RING_HAS_UNCONSUMED_REQUESTS(&vif->tx);
if (!work_to_do)
break;
idx = vif->tx.req_cons;
rmb(); /* Ensure that we see the request before we copy it. */
memcpy(&txreq, RING_GET_REQUEST(&vif->tx, idx), sizeof(txreq));
/* Credit-based scheduling. */
if (txreq.size > vif->remaining_credit &&
tx_credit_exceeded(vif, txreq.size))
break;
vif->remaining_credit -= txreq.size;
work_to_do--;
vif->tx.req_cons = ++idx;
memset(extras, 0, sizeof(extras));
if (txreq.flags & XEN_NETTXF_extra_info) {
work_to_do = xenvif_get_extras(vif, extras,
work_to_do);
idx = vif->tx.req_cons;
if (unlikely(work_to_do < 0))
break;
}
ret = xenvif_count_requests(vif, &txreq, txfrags, work_to_do);
if (unlikely(ret < 0))
break;
idx += ret;
if (unlikely(txreq.size < ETH_HLEN)) {
netdev_dbg(vif->dev,
"Bad packet size: %d\n", txreq.size);
xenvif_tx_err(vif, &txreq, idx);
break;
}
/* No crossing a page as the payload mustn't fragment. */
if (unlikely((txreq.offset + txreq.size) > PAGE_SIZE)) {
netdev_err(vif->dev,
"txreq.offset: %x, size: %u, end: %lu\n",
txreq.offset, txreq.size,
(txreq.offset&~PAGE_MASK) + txreq.size);
xenvif_fatal_tx_err(vif);
break;
}
index = pending_index(vif->pending_cons);
pending_idx = vif->pending_ring[index];
data_len = (txreq.size > PKT_PROT_LEN &&
ret < XEN_NETBK_LEGACY_SLOTS_MAX) ?
PKT_PROT_LEN : txreq.size;
skb = alloc_skb(data_len + NET_SKB_PAD + NET_IP_ALIGN,
GFP_ATOMIC | __GFP_NOWARN);
if (unlikely(skb == NULL)) {
netdev_dbg(vif->dev,
"Can't allocate a skb in start_xmit.\n");
xenvif_tx_err(vif, &txreq, idx);
break;
}
/* Packets passed to netif_rx() must have some headroom. */
skb_reserve(skb, NET_SKB_PAD + NET_IP_ALIGN);
if (extras[XEN_NETIF_EXTRA_TYPE_GSO - 1].type) {
struct xen_netif_extra_info *gso;
gso = &extras[XEN_NETIF_EXTRA_TYPE_GSO - 1];
if (xenvif_set_skb_gso(vif, skb, gso)) {
/* Failure in xenvif_set_skb_gso is fatal. */
kfree_skb(skb);
break;
}
}
/* XXX could copy straight to head */
page = xenvif_alloc_page(vif, pending_idx);
if (!page) {
kfree_skb(skb);
xenvif_tx_err(vif, &txreq, idx);
break;
}
gop->source.u.ref = txreq.gref;
gop->source.domid = vif->domid;
gop->source.offset = txreq.offset;
gop->dest.u.gmfn = virt_to_mfn(page_address(page));
gop->dest.domid = DOMID_SELF;
gop->dest.offset = txreq.offset;
gop->len = txreq.size;
gop->flags = GNTCOPY_source_gref;
gop++;
memcpy(&vif->pending_tx_info[pending_idx].req,
&txreq, sizeof(txreq));
vif->pending_tx_info[pending_idx].head = index;
*((u16 *)skb->data) = pending_idx;
__skb_put(skb, data_len);
skb_shinfo(skb)->nr_frags = ret;
if (data_len < txreq.size) {
skb_shinfo(skb)->nr_frags++;
frag_set_pending_idx(&skb_shinfo(skb)->frags[0],
pending_idx);
} else {
frag_set_pending_idx(&skb_shinfo(skb)->frags[0],
INVALID_PENDING_IDX);
}
vif->pending_cons++;
request_gop = xenvif_get_requests(vif, skb, txfrags, gop);
if (request_gop == NULL) {
kfree_skb(skb);
xenvif_tx_err(vif, &txreq, idx);
break;
}
gop = request_gop;
__skb_queue_tail(&vif->tx_queue, skb);
vif->tx.req_cons = idx;
if ((gop-vif->tx_copy_ops) >= ARRAY_SIZE(vif->tx_copy_ops))
break;
}
return gop - vif->tx_copy_ops;
}
