diff options
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/net/xen-netfront.c | 122 |
1 files changed, 86 insertions, 36 deletions
diff --git a/drivers/net/xen-netfront.c b/drivers/net/xen-netfront.c index f821a97d7827..badca3101b62 100644 --- a/drivers/net/xen-netfront.c +++ b/drivers/net/xen-netfront.c @@ -74,8 +74,8 @@ struct netfront_cb { #define GRANT_INVALID_REF 0 -#define NET_TX_RING_SIZE __CONST_RING_SIZE(xen_netif_tx, PAGE_SIZE) -#define NET_RX_RING_SIZE __CONST_RING_SIZE(xen_netif_rx, PAGE_SIZE) +#define NET_TX_RING_SIZE __CONST_RING_SIZE(xen_netif_tx, XEN_PAGE_SIZE) +#define NET_RX_RING_SIZE __CONST_RING_SIZE(xen_netif_rx, XEN_PAGE_SIZE) /* Minimum number of Rx slots (includes slot for GSO metadata). */ #define NET_RX_SLOTS_MIN (XEN_NETIF_NR_SLOTS_MIN + 1) @@ -291,7 +291,7 @@ static void xennet_alloc_rx_buffers(struct netfront_queue *queue) struct sk_buff *skb; unsigned short id; grant_ref_t ref; - unsigned long gfn; + struct page *page; struct xen_netif_rx_request *req; skb = xennet_alloc_one_rx_buffer(queue); @@ -307,14 +307,13 @@ static void xennet_alloc_rx_buffers(struct netfront_queue *queue) BUG_ON((signed short)ref < 0); queue->grant_rx_ref[id] = ref; - gfn = xen_page_to_gfn(skb_frag_page(&skb_shinfo(skb)->frags[0])); + page = skb_frag_page(&skb_shinfo(skb)->frags[0]); req = RING_GET_REQUEST(&queue->rx, req_prod); - gnttab_grant_foreign_access_ref(ref, - queue->info->xbdev->otherend_id, - gfn, - 0); - + gnttab_page_grant_foreign_access_ref_one(ref, + queue->info->xbdev->otherend_id, + page, + 0); req->id = id; req->gref = ref; } @@ -415,25 +414,33 @@ static void xennet_tx_buf_gc(struct netfront_queue *queue) xennet_maybe_wake_tx(queue); } -static struct xen_netif_tx_request *xennet_make_one_txreq( - struct netfront_queue *queue, struct sk_buff *skb, - struct page *page, unsigned int offset, unsigned int len) +struct xennet_gnttab_make_txreq { + struct netfront_queue *queue; + struct sk_buff *skb; + struct page *page; + struct xen_netif_tx_request *tx; /* Last request */ + unsigned int size; +}; + +static void xennet_tx_setup_grant(unsigned long gfn, unsigned int offset, + unsigned int len, void *data) { + struct xennet_gnttab_make_txreq *info = data; unsigned int id; struct xen_netif_tx_request *tx; grant_ref_t ref; - - len = min_t(unsigned int, PAGE_SIZE - offset, len); + /* convenient aliases */ + struct page *page = info->page; + struct netfront_queue *queue = info->queue; + struct sk_buff *skb = info->skb; id = get_id_from_freelist(&queue->tx_skb_freelist, queue->tx_skbs); tx = RING_GET_REQUEST(&queue->tx, queue->tx.req_prod_pvt++); ref = gnttab_claim_grant_reference(&queue->gref_tx_head); BUG_ON((signed short)ref < 0); - gnttab_grant_foreign_access_ref(ref, - queue->info->xbdev->otherend_id, - xen_page_to_gfn(page), - GNTMAP_readonly); + gnttab_grant_foreign_access_ref(ref, queue->info->xbdev->otherend_id, + gfn, GNTMAP_readonly); queue->tx_skbs[id].skb = skb; queue->grant_tx_page[id] = page; @@ -445,7 +452,34 @@ static struct xen_netif_tx_request *xennet_make_one_txreq( tx->size = len; tx->flags = 0; - return tx; + info->tx = tx; + info->size += tx->size; +} + +static struct xen_netif_tx_request *xennet_make_first_txreq( + struct netfront_queue *queue, struct sk_buff *skb, + struct page *page, unsigned int offset, unsigned int len) +{ + struct xennet_gnttab_make_txreq info = { + .queue = queue, + .skb = skb, + .page = page, + .size = 0, + }; + + gnttab_for_one_grant(page, offset, len, xennet_tx_setup_grant, &info); + + return info.tx; +} + +static void xennet_make_one_txreq(unsigned long gfn, unsigned int offset, + unsigned int len, void *data) +{ + struct xennet_gnttab_make_txreq *info = data; + + info->tx->flags |= XEN_NETTXF_more_data; + skb_get(info->skb); + xennet_tx_setup_grant(gfn, offset, len, data); } static struct xen_netif_tx_request *xennet_make_txreqs( @@ -453,20 +487,30 @@ static struct xen_netif_tx_request *xennet_make_txreqs( struct sk_buff *skb, struct page *page, unsigned int offset, unsigned int len) { + struct xennet_gnttab_make_txreq info = { + .queue = queue, + .skb = skb, + .tx = tx, + }; + /* Skip unused frames from start of page */ page += offset >> PAGE_SHIFT; offset &= ~PAGE_MASK; while (len) { - tx->flags |= XEN_NETTXF_more_data; - tx = xennet_make_one_txreq(queue, skb_get(skb), - page, offset, len); + info.page = page; + info.size = 0; + + gnttab_foreach_grant_in_range(page, offset, len, + xennet_make_one_txreq, + &info); + page++; offset = 0; - len -= tx->size; + len -= info.size; } - return tx; + return info.tx; } /* @@ -476,9 +520,10 @@ static struct xen_netif_tx_request *xennet_make_txreqs( static int xennet_count_skb_slots(struct sk_buff *skb) { int i, frags = skb_shinfo(skb)->nr_frags; - int pages; + int slots; - pages = PFN_UP(offset_in_page(skb->data) + skb_headlen(skb)); + slots = gnttab_count_grant(offset_in_page(skb->data), + skb_headlen(skb)); for (i = 0; i < frags; i++) { skb_frag_t *frag = skb_shinfo(skb)->frags + i; @@ -488,10 +533,10 @@ static int xennet_count_skb_slots(struct sk_buff *skb) /* Skip unused frames from start of page */ offset &= ~PAGE_MASK; - pages += PFN_UP(offset + size); + slots += gnttab_count_grant(offset, size); } - return pages; + return slots; } static u16 xennet_select_queue(struct net_device *dev, struct sk_buff *skb, @@ -512,6 +557,8 @@ static u16 xennet_select_queue(struct net_device *dev, struct sk_buff *skb, return queue_idx; } +#define MAX_XEN_SKB_FRAGS (65536 / XEN_PAGE_SIZE + 1) + static int xennet_start_xmit(struct sk_buff *skb, struct net_device *dev) { struct netfront_info *np = netdev_priv(dev); @@ -546,7 +593,7 @@ static int xennet_start_xmit(struct sk_buff *skb, struct net_device *dev) } slots = xennet_count_skb_slots(skb); - if (unlikely(slots > MAX_SKB_FRAGS + 1)) { + if (unlikely(slots > MAX_XEN_SKB_FRAGS + 1)) { net_dbg_ratelimited("xennet: skb rides the rocket: %d slots, %d bytes\n", slots, skb->len); if (skb_linearize(skb)) @@ -567,10 +614,13 @@ static int xennet_start_xmit(struct sk_buff *skb, struct net_device *dev) } /* First request for the linear area. */ - first_tx = tx = xennet_make_one_txreq(queue, skb, - page, offset, len); - page++; - offset = 0; + first_tx = tx = xennet_make_first_txreq(queue, skb, + page, offset, len); + offset += tx->size; + if (offset == PAGE_SIZE) { + page++; + offset = 0; + } len -= tx->size; if (skb->ip_summed == CHECKSUM_PARTIAL) @@ -732,7 +782,7 @@ static int xennet_get_responses(struct netfront_queue *queue, for (;;) { if (unlikely(rx->status < 0 || - rx->offset + rx->status > PAGE_SIZE)) { + rx->offset + rx->status > XEN_PAGE_SIZE)) { if (net_ratelimit()) dev_warn(dev, "rx->offset: %u, size: %d\n", rx->offset, rx->status); @@ -1496,7 +1546,7 @@ static int setup_netfront(struct xenbus_device *dev, goto fail; } SHARED_RING_INIT(txs); - FRONT_RING_INIT(&queue->tx, txs, PAGE_SIZE); + FRONT_RING_INIT(&queue->tx, txs, XEN_PAGE_SIZE); err = xenbus_grant_ring(dev, txs, 1, &gref); if (err < 0) @@ -1510,7 +1560,7 @@ static int setup_netfront(struct xenbus_device *dev, goto alloc_rx_ring_fail; } SHARED_RING_INIT(rxs); - FRONT_RING_INIT(&queue->rx, rxs, PAGE_SIZE); + FRONT_RING_INIT(&queue->rx, rxs, XEN_PAGE_SIZE); err = xenbus_grant_ring(dev, rxs, 1, &gref); if (err < 0) |