@@ -574,15 +574,15 @@ void xenvif_disconnect(struct xenvif *vif)
void xenvif_free(struct xenvif *vif)
{
int i, unmap_timeout = 0;
- /* Here we want to avoid timeout messages if an skb can be legitimatly
- * stucked somewhere else. Realisticly this could be an another vif's
+ /* Here we want to avoid timeout messages if an skb can be legitimately
+ * stuck somewhere else. Realistically this could be an another vif's
* internal or QDisc queue. That another vif also has this
* rx_drain_timeout_msecs timeout, but the timer only ditches the
* internal queue. After that, the QDisc queue can put in worst case
* XEN_NETIF_RX_RING_SIZE / MAX_SKB_FRAGS skbs into that another vif's
* internal queue, so we need several rounds of such timeouts until we
* can be sure that no another vif should have skb's from us. We are
- * not sending more skb's, so newly stucked packets are not interesting
+ * not sending more skb's, so newly stuck packets are not interesting
* for us here.
*/
unsigned int worst_case_skb_lifetime = (rx_drain_timeout_msecs/1000) *
@@ -597,6 +597,13 @@ void xenvif_free(struct xenvif *vif)
netdev_err(vif->dev,
"Page still granted! Index: %x\n",
i);
+ /* If there are still unmapped pages, reset the loop to
+ * start checking again. We shouldn't exit here until
+ * dealloc thread and NAPI instance release all the
+ * pages. If a kernel bug causes the skbs to stall
+ * somewhere, the interface cannot be brought down
+ * properly.
+ */
i = -1;
}
}
@@ -56,7 +56,7 @@ bool separate_tx_rx_irq = 1;
module_param(separate_tx_rx_irq, bool, 0644);
/* When guest ring is filled up, qdisc queues the packets for us, but we have
- * to timeout them, otherwise other guests' packets can get stucked there
+ * to timeout them, otherwise other guests' packets can get stuck there
*/
unsigned int rx_drain_timeout_msecs = 10000;
module_param(rx_drain_timeout_msecs, uint, 0444);
@@ -1545,7 +1545,6 @@ static inline void xenvif_tx_dealloc_action(struct xenvif *vif)
idx_to_kaddr(vif, pending_idx),
GNTMAP_host_map,
vif->grant_tx_handle[pending_idx]);
- /* Btw. already unmapped? */
xenvif_grant_handle_reset(vif, pending_idx);
++gop;
}
@@ -1678,7 +1677,6 @@ void xenvif_idx_unmap(struct xenvif *vif, u16 pending_idx)
idx_to_kaddr(vif, pending_idx),
GNTMAP_host_map,
vif->grant_tx_handle[pending_idx]);
- /* Btw. already unmapped? */
xenvif_grant_handle_reset(vif, pending_idx);
ret = gnttab_unmap_refs(&tx_unmap_op, NULL,
Ian made some late comments about the grant mapping series, I incorporated the non-functional outcomes into this patch: - typo fixes in a comment of xenvif_free(), and add another one there as well - typo fix for comment of rx_drain_timeout_msecs - remove stale comment before calling xenvif_grant_handle_reset() Signed-off-by: Zoltan Kiss <zoltan.kiss@citrix.com> --- v2: - expand commit message and split this into 2 patch - fix typos -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html