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xen-netback: Remove old TX grant copy definitons and fix indentations

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These became obsolete with grant mapping. I've left intentionally the
indentations in this way, to improve readability of previous patches.

NOTE: if bisect brought you here, you should apply the series up until
"xen-netback: Timeout packets in RX path", otherwise Windows guests can't work
properly and malicious guests can block other guests by not releasing their sent
packets.

Signed-off-by: Zoltan Kiss <zoltan.kiss@citrix.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Zoltan Kiss 2014-03-06 21:48:27 +00:00 committed by David S. Miller
parent f53c3fe8da
commit 62bad3199a
2 changed files with 15 additions and 93 deletions
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36
drivers/net/xen-netback/common.h
View File

@ -48,37 +48,8 @@
typedef unsigned int pending_ring_idx_t;
#define INVALID_PENDING_RING_IDX (~0U)
/* For the head field in pending_tx_info: it is used to indicate
* whether this tx info is the head of one or more coalesced requests.
*
* When head != INVALID_PENDING_RING_IDX, it means the start of a new
* tx requests queue and the end of previous queue.
*
* An example sequence of head fields (I = INVALID_PENDING_RING_IDX):
*
* ...|0 I I I|5 I|9 I I I|...
* -->|<-INUSE----------------
*
* After consuming the first slot(s) we have:
*
* ...|V V V V|5 I|9 I I I|...
* -----FREE->|<-INUSE--------
*
* where V stands for "valid pending ring index". Any number other
* than INVALID_PENDING_RING_IDX is OK. These entries are considered
* free and can contain any number other than
* INVALID_PENDING_RING_IDX. In practice we use 0.
*
* The in use non-INVALID_PENDING_RING_IDX (say 0, 5 and 9 in the
* above example) number is the index into pending_tx_info and
* mmap_pages arrays.
*/
struct pending_tx_info {
struct xen_netif_tx_request req; /* coalesced tx request */
pending_ring_idx_t head; /* head != INVALID_PENDING_RING_IDX
* if it is head of one or more tx
* reqs
*/
struct xen_netif_tx_request req; /* tx request */
/* Callback data for released SKBs. The callback is always
* xenvif_zerocopy_callback, desc contains the pending_idx, which is
* also an index in pending_tx_info array. It is initialized in
@ -148,11 +119,6 @@ struct xenvif {
struct pending_tx_info pending_tx_info[MAX_PENDING_REQS];
grant_handle_t grant_tx_handle[MAX_PENDING_REQS];
/* Coalescing tx requests before copying makes number of grant
* copy ops greater or equal to number of slots required. In
* worst case a tx request consumes 2 gnttab_copy.
*/
struct gnttab_copy tx_copy_ops[2*MAX_PENDING_REQS];
struct gnttab_map_grant_ref tx_map_ops[MAX_PENDING_REQS];
struct gnttab_unmap_grant_ref tx_unmap_ops[MAX_PENDING_REQS];
/* passed to gnttab_[un]map_refs with pages under (un)mapping */

72
drivers/net/xen-netback/netback.c
View File

@ -62,16 +62,6 @@ module_param(separate_tx_rx_irq, bool, 0644);
static unsigned int fatal_skb_slots = FATAL_SKB_SLOTS_DEFAULT;
module_param(fatal_skb_slots, uint, 0444);
/*
* If head != INVALID_PENDING_RING_IDX, it means this tx request is head of
* one or more merged tx requests, otherwise it is the continuation of
* previous tx request.
*/
static inline int pending_tx_is_head(struct xenvif *vif, RING_IDX idx)
{
return vif->pending_tx_info[idx].head != INVALID_PENDING_RING_IDX;
}
static void xenvif_idx_release(struct xenvif *vif, u16 pending_idx,
u8 status);
@ -790,19 +780,6 @@ static int xenvif_count_requests(struct xenvif *vif,
return slots;
}
static struct page *xenvif_alloc_page(struct xenvif *vif,
u16 pending_idx)
{
struct page *page;
page = alloc_page(GFP_ATOMIC|__GFP_COLD);
if (!page)
return NULL;
vif->mmap_pages[pending_idx] = page;
return page;
}
struct xenvif_tx_cb {
u16 pending_idx;
@ -832,13 +809,9 @@ static struct gnttab_map_grant_ref *xenvif_get_requests(struct xenvif *vif,
struct skb_shared_info *shinfo = skb_shinfo(skb);
skb_frag_t *frags = shinfo->frags;
u16 pending_idx = XENVIF_TX_CB(skb)->pending_idx;
u16 head_idx = 0;
int slot, start;
struct page *page;
pending_ring_idx_t index, start_idx = 0;
uint16_t dst_offset;
int start;
pending_ring_idx_t index;
unsigned int nr_slots;
struct pending_tx_info *first = NULL;
/* At this point shinfo->nr_frags is in fact the number of
* slots, which can be as large as XEN_NETBK_LEGACY_SLOTS_MAX.
@ -850,8 +823,8 @@ static struct gnttab_map_grant_ref *xenvif_get_requests(struct xenvif *vif,
for (shinfo->nr_frags = start; shinfo->nr_frags < nr_slots;
shinfo->nr_frags++, txp++, gop++) {
index = pending_index(vif->pending_cons++);
pending_idx = vif->pending_ring[index];
index = pending_index(vif->pending_cons++);
pending_idx = vif->pending_ring[index];
xenvif_tx_create_gop(vif, pending_idx, txp, gop);
frag_set_pending_idx(&frags[shinfo->nr_frags], pending_idx);
}
@ -859,18 +832,6 @@ static struct gnttab_map_grant_ref *xenvif_get_requests(struct xenvif *vif,
BUG_ON(shinfo->nr_frags > MAX_SKB_FRAGS);
return gop;
err:
/* Unwind, freeing all pages and sending error responses. */
while (shinfo->nr_frags-- > start) {
xenvif_idx_release(vif,
frag_get_pending_idx(&frags[shinfo->nr_frags]),
XEN_NETIF_RSP_ERROR);
}
/* The head too, if necessary. */
if (start)
xenvif_idx_release(vif, pending_idx, XEN_NETIF_RSP_ERROR);
return NULL;
}
static inline void xenvif_grant_handle_set(struct xenvif *vif,
@ -910,7 +871,6 @@ static int xenvif_tx_check_gop(struct xenvif *vif,
struct pending_tx_info *tx_info;
int nr_frags = shinfo->nr_frags;
int i, err, start;
u16 peek; /* peek into next tx request */
/* Check status of header. */
err = gop->status;
@ -924,14 +884,12 @@ static int xenvif_tx_check_gop(struct xenvif *vif,
for (i = start; i < nr_frags; i++) {
int j, newerr;
pending_ring_idx_t head;
pending_idx = frag_get_pending_idx(&shinfo->frags[i]);
tx_info = &vif->pending_tx_info[pending_idx];
head = tx_info->head;
/* Check error status: if okay then remember grant handle. */
newerr = (++gop)->status;
newerr = (++gop)->status;
if (likely(!newerr)) {
xenvif_grant_handle_set(vif, pending_idx , gop->handle);
@ -1136,7 +1094,6 @@ static unsigned xenvif_tx_build_gops(struct xenvif *vif, int budget)
(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;
@ -1507,18 +1464,17 @@ static void xenvif_idx_release(struct xenvif *vif, u16 pending_idx,
{
struct pending_tx_info *pending_tx_info;
pending_ring_idx_t index;
u16 peek; /* peek into next tx request */
unsigned long flags;
pending_tx_info = &vif->pending_tx_info[pending_idx];
spin_lock_irqsave(&vif->response_lock, flags);
make_tx_response(vif, &pending_tx_info->req, status);
index = pending_index(vif->pending_prod);
vif->pending_ring[index] = pending_idx;
/* TX shouldn't use the index before we give it back here */
mb();
vif->pending_prod++;
spin_unlock_irqrestore(&vif->response_lock, flags);
pending_tx_info = &vif->pending_tx_info[pending_idx];
spin_lock_irqsave(&vif->response_lock, flags);
make_tx_response(vif, &pending_tx_info->req, status);
index = pending_index(vif->pending_prod);
vif->pending_ring[index] = pending_idx;
/* TX shouldn't use the index before we give it back here */
mb();
vif->pending_prod++;
spin_unlock_irqrestore(&vif->response_lock, flags);
}