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Date: Thu, 6 Mar 2014 21:48:23 +0000
From: Zoltan Kiss <zoltan.kiss@...rix.com>
To: <ian.campbell@...rix.com>, <wei.liu2@...rix.com>,
<xen-devel@...ts.xenproject.org>
CC: <netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
<jonathan.davies@...rix.com>, Zoltan Kiss <zoltan.kiss@...rix.com>
Subject: [PATCH net-next v7 1/9] xen-netback: Use skb->cb for pending_idx
Storing the pending_idx at the first byte of the linear buffer never looked
good, skb->cb is a more proper place for this. It also prevents the header to
be directly grant copied there, and we don't have the pending_idx after we
copied the header here, so it's time to change it.
It also introduces helpers for the RX side
Signed-off-by: Zoltan Kiss <zoltan.kiss@...rix.com>
---
v7:
- using helpers to access skb->cb, on RX side too
diff --git a/drivers/net/xen-netback/netback.c b/drivers/net/xen-netback/netback.c
index e5284bc..43ae4ba 100644
--- a/drivers/net/xen-netback/netback.c
+++ b/drivers/net/xen-netback/netback.c
@@ -455,10 +455,12 @@ static void xenvif_add_frag_responses(struct xenvif *vif, int status,
}
}
-struct skb_cb_overlay {
+struct xenvif_rx_cb {
int meta_slots_used;
};
+#define XENVIF_RX_CB(skb) ((struct xenvif_rx_cb *)(skb)->cb)
+
void xenvif_kick_thread(struct xenvif *vif)
{
wake_up(&vif->wq);
@@ -474,7 +476,6 @@ static void xenvif_rx_action(struct xenvif *vif)
LIST_HEAD(notify);
int ret;
unsigned long offset;
- struct skb_cb_overlay *sco;
bool need_to_notify = false;
struct netrx_pending_operations npo = {
@@ -513,9 +514,8 @@ static void xenvif_rx_action(struct xenvif *vif)
} else
vif->rx_last_skb_slots = 0;
- sco = (struct skb_cb_overlay *)skb->cb;
- sco->meta_slots_used = xenvif_gop_skb(skb, &npo);
- BUG_ON(sco->meta_slots_used > max_slots_needed);
+ XENVIF_RX_CB(skb)->meta_slots_used = xenvif_gop_skb(skb, &npo);
+ BUG_ON(XENVIF_RX_CB(skb)->meta_slots_used > max_slots_needed);
__skb_queue_tail(&rxq, skb);
}
@@ -529,7 +529,6 @@ static void xenvif_rx_action(struct xenvif *vif)
gnttab_batch_copy(vif->grant_copy_op, npo.copy_prod);
while ((skb = __skb_dequeue(&rxq)) != NULL) {
- sco = (struct skb_cb_overlay *)skb->cb;
if ((1 << vif->meta[npo.meta_cons].gso_type) &
vif->gso_prefix_mask) {
@@ -540,19 +539,21 @@ static void xenvif_rx_action(struct xenvif *vif)
resp->offset = vif->meta[npo.meta_cons].gso_size;
resp->id = vif->meta[npo.meta_cons].id;
- resp->status = sco->meta_slots_used;
+ resp->status = XENVIF_RX_CB(skb)->meta_slots_used;
npo.meta_cons++;
- sco->meta_slots_used--;
+ XENVIF_RX_CB(skb)->meta_slots_used--;
}
vif->dev->stats.tx_bytes += skb->len;
vif->dev->stats.tx_packets++;
- status = xenvif_check_gop(vif, sco->meta_slots_used, &npo);
+ status = xenvif_check_gop(vif,
+ XENVIF_RX_CB(skb)->meta_slots_used,
+ &npo);
- if (sco->meta_slots_used == 1)
+ if (XENVIF_RX_CB(skb)->meta_slots_used == 1)
flags = 0;
else
flags = XEN_NETRXF_more_data;
@@ -589,13 +590,13 @@ static void xenvif_rx_action(struct xenvif *vif)
xenvif_add_frag_responses(vif, status,
vif->meta + npo.meta_cons + 1,
- sco->meta_slots_used);
+ XENVIF_RX_CB(skb)->meta_slots_used);
RING_PUSH_RESPONSES_AND_CHECK_NOTIFY(&vif->rx, ret);
need_to_notify |= !!ret;
- npo.meta_cons += sco->meta_slots_used;
+ npo.meta_cons += XENVIF_RX_CB(skb)->meta_slots_used;
dev_kfree_skb(skb);
}
@@ -772,6 +773,13 @@ static struct page *xenvif_alloc_page(struct xenvif *vif,
return page;
}
+
+struct xenvif_tx_cb {
+ u16 pending_idx;
+};
+
+#define XENVIF_TX_CB(skb) ((struct xenvif_tx_cb *)(skb)->cb)
+
static struct gnttab_copy *xenvif_get_requests(struct xenvif *vif,
struct sk_buff *skb,
struct xen_netif_tx_request *txp,
@@ -779,7 +787,7 @@ static struct gnttab_copy *xenvif_get_requests(struct xenvif *vif,
{
struct skb_shared_info *shinfo = skb_shinfo(skb);
skb_frag_t *frags = shinfo->frags;
- u16 pending_idx = *((u16 *)skb->data);
+ u16 pending_idx = XENVIF_TX_CB(skb)->pending_idx;
u16 head_idx = 0;
int slot, start;
struct page *page;
@@ -897,7 +905,7 @@ static int xenvif_tx_check_gop(struct xenvif *vif,
struct gnttab_copy **gopp)
{
struct gnttab_copy *gop = *gopp;
- u16 pending_idx = *((u16 *)skb->data);
+ u16 pending_idx = XENVIF_TX_CB(skb)->pending_idx;
struct skb_shared_info *shinfo = skb_shinfo(skb);
struct pending_tx_info *tx_info;
int nr_frags = shinfo->nr_frags;
@@ -944,7 +952,7 @@ static int xenvif_tx_check_gop(struct xenvif *vif,
continue;
/* First error: invalidate header and preceding fragments. */
- pending_idx = *((u16 *)skb->data);
+ pending_idx = XENVIF_TX_CB(skb)->pending_idx;
xenvif_idx_release(vif, pending_idx, XEN_NETIF_RSP_OKAY);
for (j = start; j < i; j++) {
pending_idx = frag_get_pending_idx(&shinfo->frags[j]);
@@ -1236,7 +1244,7 @@ static unsigned xenvif_tx_build_gops(struct xenvif *vif, int budget)
memcpy(&vif->pending_tx_info[pending_idx].req,
&txreq, sizeof(txreq));
vif->pending_tx_info[pending_idx].head = index;
- *((u16 *)skb->data) = pending_idx;
+ XENVIF_TX_CB(skb)->pending_idx = pending_idx;
__skb_put(skb, data_len);
@@ -1283,7 +1291,7 @@ static int xenvif_tx_submit(struct xenvif *vif)
u16 pending_idx;
unsigned data_len;
- pending_idx = *((u16 *)skb->data);
+ pending_idx = XENVIF_TX_CB(skb)->pending_idx;
txp = &vif->pending_tx_info[pending_idx].req;
/* Check the remap error code. */
--
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