diff options
| -rw-r--r-- | drivers/net/xen-netback/common.h | 36 | ||||
| -rw-r--r-- | drivers/net/xen-netback/netback.c | 72 |
2 files changed, 15 insertions, 93 deletions
diff --git a/drivers/net/xen-netback/common.h b/drivers/net/xen-netback/common.h index 5a991266a394..49109afa2253 100644 --- a/drivers/net/xen-netback/common.h +++ b/drivers/net/xen-netback/common.h @@ -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 */ diff --git a/drivers/net/xen-netback/netback.c b/drivers/net/xen-netback/netback.c index cb29134147d1..46a75706cb78 100644 --- a/drivers/net/xen-netback/netback.c +++ b/drivers/net/xen-netback/netback.c @@ -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); } |