forked from mirrors/linux
xen-netback: support multiple extra info fragments passed from frontend
The code does not currently support a frontend passing multiple extra info fragments to the backend in a tx request. The xenvif_get_extras() function handles multiple extra_info fragments but make_tx_response() assumes there is only ever a single extra info fragment. This patch modifies xenvif_get_extras() to pass back a count of extra info fragments, which is then passed to make_tx_response() (after possibly being stashed in pending_tx_info for deferred responses). Signed-off-by: Paul Durrant <paul.durrant@citrix.com> Cc: Wei Liu <wei.liu2@citrix.com> Acked-by: Wei Liu <wei.liu2@citrix.com> Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Paul Durrant
David S. Miller
parent
6b8abef5f8
commit
562abd39a1
2 changed files with 43 additions and 23 deletions
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@ -52,6 +52,7 @@ typedef unsigned int pending_ring_idx_t;
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struct pending_tx_info {
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struct xen_netif_tx_request req; /* tx request */
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unsigned int extra_count;
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/* Callback data for released SKBs. The callback is always
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* xenvif_zerocopy_callback, desc contains the pending_idx, which is
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* also an index in pending_tx_info array. It is initialized in
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@ -95,6 +95,7 @@ static void xenvif_idx_release(struct xenvif_queue *queue, u16 pending_idx,
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static void make_tx_response(struct xenvif_queue *queue,
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struct xen_netif_tx_request *txp,
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unsigned int extra_count,
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s8 st);
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static void push_tx_responses(struct xenvif_queue *queue);
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@ -696,14 +697,15 @@ void xenvif_tx_credit_callback(unsigned long data)
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}
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static void xenvif_tx_err(struct xenvif_queue *queue,
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struct xen_netif_tx_request *txp, RING_IDX end)
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struct xen_netif_tx_request *txp,
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unsigned int extra_count, RING_IDX end)
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{
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RING_IDX cons = queue->tx.req_cons;
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unsigned long flags;
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do {
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spin_lock_irqsave(&queue->response_lock, flags);
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make_tx_response(queue, txp, XEN_NETIF_RSP_ERROR);
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make_tx_response(queue, txp, extra_count, XEN_NETIF_RSP_ERROR);
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push_tx_responses(queue);
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spin_unlock_irqrestore(&queue->response_lock, flags);
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if (cons == end)
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@ -724,6 +726,7 @@ static void xenvif_fatal_tx_err(struct xenvif *vif)
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static int xenvif_count_requests(struct xenvif_queue *queue,
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struct xen_netif_tx_request *first,
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unsigned int extra_count,
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struct xen_netif_tx_request *txp,
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int work_to_do)
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{
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@ -812,7 +815,7 @@ static int xenvif_count_requests(struct xenvif_queue *queue,
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} while (more_data);
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if (drop_err) {
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xenvif_tx_err(queue, first, cons + slots);
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xenvif_tx_err(queue, first, extra_count, cons + slots);
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return drop_err;
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}
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@ -827,9 +830,10 @@ struct xenvif_tx_cb {
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#define XENVIF_TX_CB(skb) ((struct xenvif_tx_cb *)(skb)->cb)
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static inline void xenvif_tx_create_map_op(struct xenvif_queue *queue,
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u16 pending_idx,
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struct xen_netif_tx_request *txp,
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struct gnttab_map_grant_ref *mop)
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u16 pending_idx,
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struct xen_netif_tx_request *txp,
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unsigned int extra_count,
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struct gnttab_map_grant_ref *mop)
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{
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queue->pages_to_map[mop-queue->tx_map_ops] = queue->mmap_pages[pending_idx];
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gnttab_set_map_op(mop, idx_to_kaddr(queue, pending_idx),
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@ -838,6 +842,7 @@ static inline void xenvif_tx_create_map_op(struct xenvif_queue *queue,
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memcpy(&queue->pending_tx_info[pending_idx].req, txp,
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sizeof(*txp));
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queue->pending_tx_info[pending_idx].extra_count = extra_count;
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}
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static inline struct sk_buff *xenvif_alloc_skb(unsigned int size)
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@ -880,7 +885,7 @@ static struct gnttab_map_grant_ref *xenvif_get_requests(struct xenvif_queue *que
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shinfo->nr_frags++, txp++, gop++) {
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index = pending_index(queue->pending_cons++);
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pending_idx = queue->pending_ring[index];
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xenvif_tx_create_map_op(queue, pending_idx, txp, gop);
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xenvif_tx_create_map_op(queue, pending_idx, txp, 0, gop);
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frag_set_pending_idx(&frags[shinfo->nr_frags], pending_idx);
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}
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@ -893,7 +898,8 @@ static struct gnttab_map_grant_ref *xenvif_get_requests(struct xenvif_queue *que
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shinfo->nr_frags++, txp++, gop++) {
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index = pending_index(queue->pending_cons++);
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pending_idx = queue->pending_ring[index];
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xenvif_tx_create_map_op(queue, pending_idx, txp, gop);
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xenvif_tx_create_map_op(queue, pending_idx, txp, 0,
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gop);
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frag_set_pending_idx(&frags[shinfo->nr_frags],
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pending_idx);
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}
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@ -1095,8 +1101,9 @@ static void xenvif_fill_frags(struct xenvif_queue *queue, struct sk_buff *skb)
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}
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static int xenvif_get_extras(struct xenvif_queue *queue,
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struct xen_netif_extra_info *extras,
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int work_to_do)
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struct xen_netif_extra_info *extras,
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unsigned int *extra_count,
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int work_to_do)
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{
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struct xen_netif_extra_info extra;
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RING_IDX cons = queue->tx.req_cons;
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@ -1109,9 +1116,12 @@ static int xenvif_get_extras(struct xenvif_queue *queue,
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}
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RING_COPY_REQUEST(&queue->tx, cons, &extra);
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queue->tx.req_cons = ++cons;
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(*extra_count)++;
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if (unlikely(!extra.type ||
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extra.type >= XEN_NETIF_EXTRA_TYPE_MAX)) {
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queue->tx.req_cons = ++cons;
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netdev_err(queue->vif->dev,
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"Invalid extra type: %d\n", extra.type);
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xenvif_fatal_tx_err(queue->vif);
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@ -1119,7 +1129,6 @@ static int xenvif_get_extras(struct xenvif_queue *queue,
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}
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memcpy(&extras[extra.type - 1], &extra, sizeof(extra));
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queue->tx.req_cons = ++cons;
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} while (extra.flags & XEN_NETIF_EXTRA_FLAG_MORE);
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return work_to_do;
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@ -1294,6 +1303,7 @@ static void xenvif_tx_build_gops(struct xenvif_queue *queue,
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struct xen_netif_tx_request txreq;
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struct xen_netif_tx_request txfrags[XEN_NETBK_LEGACY_SLOTS_MAX];
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struct xen_netif_extra_info extras[XEN_NETIF_EXTRA_TYPE_MAX-1];
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unsigned int extra_count;
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u16 pending_idx;
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RING_IDX idx;
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int work_to_do;
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@ -1330,8 +1340,10 @@ static void xenvif_tx_build_gops(struct xenvif_queue *queue,
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queue->tx.req_cons = ++idx;
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memset(extras, 0, sizeof(extras));
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extra_count = 0;
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if (txreq.flags & XEN_NETTXF_extra_info) {
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work_to_do = xenvif_get_extras(queue, extras,
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&extra_count,
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work_to_do);
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idx = queue->tx.req_cons;
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if (unlikely(work_to_do < 0))
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@ -1344,7 +1356,7 @@ static void xenvif_tx_build_gops(struct xenvif_queue *queue,
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extra = &extras[XEN_NETIF_EXTRA_TYPE_MCAST_ADD - 1];
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ret = xenvif_mcast_add(queue->vif, extra->u.mcast.addr);
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make_tx_response(queue, &txreq,
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make_tx_response(queue, &txreq, extra_count,
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(ret == 0) ?
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XEN_NETIF_RSP_OKAY :
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XEN_NETIF_RSP_ERROR);
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@ -1358,12 +1370,14 @@ static void xenvif_tx_build_gops(struct xenvif_queue *queue,
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extra = &extras[XEN_NETIF_EXTRA_TYPE_MCAST_DEL - 1];
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xenvif_mcast_del(queue->vif, extra->u.mcast.addr);
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make_tx_response(queue, &txreq, XEN_NETIF_RSP_OKAY);
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make_tx_response(queue, &txreq, extra_count,
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XEN_NETIF_RSP_OKAY);
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push_tx_responses(queue);
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continue;
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}
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ret = xenvif_count_requests(queue, &txreq, txfrags, work_to_do);
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ret = xenvif_count_requests(queue, &txreq, extra_count,
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txfrags, work_to_do);
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if (unlikely(ret < 0))
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break;
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@ -1372,7 +1386,7 @@ static void xenvif_tx_build_gops(struct xenvif_queue *queue,
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if (unlikely(txreq.size < ETH_HLEN)) {
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netdev_dbg(queue->vif->dev,
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"Bad packet size: %d\n", txreq.size);
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xenvif_tx_err(queue, &txreq, idx);
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xenvif_tx_err(queue, &txreq, extra_count, idx);
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break;
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}
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@ -1397,7 +1411,7 @@ static void xenvif_tx_build_gops(struct xenvif_queue *queue,
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if (unlikely(skb == NULL)) {
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netdev_dbg(queue->vif->dev,
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"Can't allocate a skb in start_xmit.\n");
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xenvif_tx_err(queue, &txreq, idx);
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xenvif_tx_err(queue, &txreq, extra_count, idx);
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break;
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}
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@ -1416,7 +1430,7 @@ static void xenvif_tx_build_gops(struct xenvif_queue *queue,
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nskb = xenvif_alloc_skb(0);
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if (unlikely(nskb == NULL)) {
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kfree_skb(skb);
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xenvif_tx_err(queue, &txreq, idx);
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xenvif_tx_err(queue, &txreq, extra_count, idx);
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if (net_ratelimit())
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netdev_err(queue->vif->dev,
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"Can't allocate the frag_list skb.\n");
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@ -1457,13 +1471,16 @@ static void xenvif_tx_build_gops(struct xenvif_queue *queue,
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if (data_len < txreq.size) {
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frag_set_pending_idx(&skb_shinfo(skb)->frags[0],
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pending_idx);
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xenvif_tx_create_map_op(queue, pending_idx, &txreq, gop);
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xenvif_tx_create_map_op(queue, pending_idx, &txreq,
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extra_count, gop);
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gop++;
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} else {
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frag_set_pending_idx(&skb_shinfo(skb)->frags[0],
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INVALID_PENDING_IDX);
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memcpy(&queue->pending_tx_info[pending_idx].req, &txreq,
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sizeof(txreq));
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memcpy(&queue->pending_tx_info[pending_idx].req,
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&txreq, sizeof(txreq));
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queue->pending_tx_info[pending_idx].extra_count =
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extra_count;
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}
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queue->pending_cons++;
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@ -1804,7 +1821,8 @@ static void xenvif_idx_release(struct xenvif_queue *queue, u16 pending_idx,
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spin_lock_irqsave(&queue->response_lock, flags);
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make_tx_response(queue, &pending_tx_info->req, status);
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make_tx_response(queue, &pending_tx_info->req,
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pending_tx_info->extra_count, status);
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/* Release the pending index before pusing the Tx response so
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* its available before a new Tx request is pushed by the
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@ -1821,6 +1839,7 @@ static void xenvif_idx_release(struct xenvif_queue *queue, u16 pending_idx,
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static void make_tx_response(struct xenvif_queue *queue,
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struct xen_netif_tx_request *txp,
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unsigned int extra_count,
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s8 st)
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{
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RING_IDX i = queue->tx.rsp_prod_pvt;
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@ -1830,7 +1849,7 @@ static void make_tx_response(struct xenvif_queue *queue,
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resp->id = txp->id;
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resp->status = st;
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if (txp->flags & XEN_NETTXF_extra_info)
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while (extra_count-- != 0)
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RING_GET_RESPONSE(&queue->tx, ++i)->status = XEN_NETIF_RSP_NULL;
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queue->tx.rsp_prod_pvt = ++i;
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