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Date: Tue, 12 May 2015 19:18:33 +0200
From: Joao Martins <joao.martins@...lab.eu>
To: <xen-devel@...ts.xenproject.org>, <netdev@...r.kernel.org>
CC: <wei.liu2@...rix.com>, <ian.campbell@...rix.com>,
<david.vrabel@...rix.com>, <boris.ostrovsky@...cle.com>,
<konrad.wilk@...cle.com>, Joao Martins <joao.martins@...lab.eu>
Subject: [RFC PATCH 09/13] xen-netfront: move grant_{ref,page} to struct grant
Refactors a little bit how grants are stored by moving
grant_rx_ref/grant_tx_ref and grant_tx_page to its
own structure, namely struct grant.
Signed-off-by: Joao Martins <joao.martins@...lab.eu>
---
drivers/net/xen-netfront.c | 56 ++++++++++++++++++++++++++--------------------
1 file changed, 32 insertions(+), 24 deletions(-)
diff --git a/drivers/net/xen-netfront.c b/drivers/net/xen-netfront.c
index 3f45afd..8f49ed4 100644
--- a/drivers/net/xen-netfront.c
+++ b/drivers/net/xen-netfront.c
@@ -87,6 +87,11 @@ struct netfront_cb {
/* IRQ name is queue name with "-tx" or "-rx" appended */
#define IRQ_NAME_SIZE (QUEUE_NAME_SIZE + 3)
+struct grant {
+ grant_ref_t ref;
+ struct page *page;
+};
+
struct netfront_stats {
u64 packets;
u64 bytes;
@@ -129,8 +134,7 @@ struct netfront_queue {
unsigned long link;
} tx_skbs[NET_TX_RING_SIZE];
grant_ref_t gref_tx_head;
- grant_ref_t grant_tx_ref[NET_TX_RING_SIZE];
- struct page *grant_tx_page[NET_TX_RING_SIZE];
+ struct grant grant_tx[NET_TX_RING_SIZE];
unsigned tx_skb_freelist;
spinlock_t rx_lock ____cacheline_aligned_in_smp;
@@ -141,7 +145,7 @@ struct netfront_queue {
struct sk_buff *rx_skbs[NET_RX_RING_SIZE];
grant_ref_t gref_rx_head;
- grant_ref_t grant_rx_ref[NET_RX_RING_SIZE];
+ struct grant grant_rx[NET_RX_RING_SIZE];
};
struct netfront_info {
@@ -213,8 +217,9 @@ static grant_ref_t xennet_get_rx_ref(struct netfront_queue *queue,
RING_IDX ri)
{
int i = xennet_rxidx(ri);
- grant_ref_t ref = queue->grant_rx_ref[i];
- queue->grant_rx_ref[i] = GRANT_INVALID_REF;
+ grant_ref_t ref = queue->grant_rx[i].ref;
+
+ queue->grant_rx[i].ref = GRANT_INVALID_REF;
return ref;
}
@@ -306,7 +311,7 @@ static void xennet_alloc_rx_buffers(struct netfront_queue *queue)
ref = gnttab_claim_grant_reference(&queue->gref_rx_head);
BUG_ON((signed short)ref < 0);
- queue->grant_rx_ref[id] = ref;
+ queue->grant_rx[id].ref = ref;
pfn = page_to_pfn(skb_frag_page(&skb_shinfo(skb)->frags[0]));
@@ -383,17 +388,17 @@ static void xennet_tx_buf_gc(struct netfront_queue *queue)
id = txrsp->id;
skb = queue->tx_skbs[id].skb;
if (unlikely(gnttab_query_foreign_access(
- queue->grant_tx_ref[id]) != 0)) {
+ queue->grant_tx[id].ref) != 0)) {
pr_alert("%s: warning -- grant still in use by backend domain\n",
__func__);
BUG();
}
gnttab_end_foreign_access_ref(
- queue->grant_tx_ref[id], GNTMAP_readonly);
+ queue->grant_tx[id].ref, GNTMAP_readonly);
gnttab_release_grant_reference(
- &queue->gref_tx_head, queue->grant_tx_ref[id]);
- queue->grant_tx_ref[id] = GRANT_INVALID_REF;
- queue->grant_tx_page[id] = NULL;
+ &queue->gref_tx_head, queue->grant_tx[id].ref);
+ queue->grant_tx[id].ref = GRANT_INVALID_REF;
+ queue->grant_tx[id].page = NULL;
add_id_to_freelist(&queue->tx_skb_freelist, queue->tx_skbs, id);
dev_kfree_skb_irq(skb);
}
@@ -435,8 +440,8 @@ static struct xen_netif_tx_request *xennet_make_one_txreq(
page_to_mfn(page), GNTMAP_readonly);
queue->tx_skbs[id].skb = skb;
- queue->grant_tx_page[id] = page;
- queue->grant_tx_ref[id] = ref;
+ queue->grant_tx[id].page = page;
+ queue->grant_tx[id].ref = ref;
tx->id = id;
tx->gref = ref;
@@ -659,7 +664,7 @@ static void xennet_move_rx_slot(struct netfront_queue *queue, struct sk_buff *sk
BUG_ON(queue->rx_skbs[new]);
queue->rx_skbs[new] = skb;
- queue->grant_rx_ref[new] = ref;
+ queue->grant_rx[new].ref = ref;
RING_GET_REQUEST(&queue->rx, queue->rx.req_prod_pvt)->id = new;
RING_GET_REQUEST(&queue->rx, queue->rx.req_prod_pvt)->gref = ref;
queue->rx.req_prod_pvt++;
@@ -1055,6 +1060,7 @@ static struct rtnl_link_stats64 *xennet_get_stats64(struct net_device *dev,
static void xennet_release_tx_bufs(struct netfront_queue *queue)
{
struct sk_buff *skb;
+ struct page *page;
int i;
for (i = 0; i < NET_TX_RING_SIZE; i++) {
@@ -1063,12 +1069,13 @@ static void xennet_release_tx_bufs(struct netfront_queue *queue)
continue;
skb = queue->tx_skbs[i].skb;
- get_page(queue->grant_tx_page[i]);
- gnttab_end_foreign_access(queue->grant_tx_ref[i],
+ page = queue->grant_tx[i].page;
+ get_page(page);
+ gnttab_end_foreign_access(queue->grant_tx[i].ref,
GNTMAP_readonly,
- (unsigned long)page_address(queue->grant_tx_page[i]));
- queue->grant_tx_page[i] = NULL;
- queue->grant_tx_ref[i] = GRANT_INVALID_REF;
+ (unsigned long)page_address(page));
+ queue->grant_tx[i].page = NULL;
+ queue->grant_tx[i].ref = GRANT_INVALID_REF;
add_id_to_freelist(&queue->tx_skb_freelist, queue->tx_skbs, i);
dev_kfree_skb_irq(skb);
}
@@ -1088,7 +1095,7 @@ static void xennet_release_rx_bufs(struct netfront_queue *queue)
if (!skb)
continue;
- ref = queue->grant_rx_ref[id];
+ ref = queue->grant_rx[id].ref;
if (ref == GRANT_INVALID_REF)
continue;
@@ -1100,7 +1107,7 @@ static void xennet_release_rx_bufs(struct netfront_queue *queue)
get_page(page);
gnttab_end_foreign_access(ref, 0,
(unsigned long)page_address(page));
- queue->grant_rx_ref[id] = GRANT_INVALID_REF;
+ queue->grant_rx[id].ref = GRANT_INVALID_REF;
kfree_skb(skb);
}
@@ -1571,14 +1578,15 @@ static int xennet_init_queue(struct netfront_queue *queue)
queue->tx_skb_freelist = 0;
for (i = 0; i < NET_TX_RING_SIZE; i++) {
skb_entry_set_link(&queue->tx_skbs[i], i+1);
- queue->grant_tx_ref[i] = GRANT_INVALID_REF;
- queue->grant_tx_page[i] = NULL;
+ queue->grant_tx[i].ref = GRANT_INVALID_REF;
+ queue->grant_tx[i].page = NULL;
}
/* Clear out rx_skbs */
for (i = 0; i < NET_RX_RING_SIZE; i++) {
queue->rx_skbs[i] = NULL;
- queue->grant_rx_ref[i] = GRANT_INVALID_REF;
+ queue->grant_rx[i].ref = GRANT_INVALID_REF;
+ queue->grant_rx[i].page = NULL;
}
/* A grant for every tx ring slot */
--
2.1.3
--
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