Messages in this thread | | | Date | Fri, 21 Mar 2014 19:31:21 +0000 | From | Zoltan Kiss <> | Subject | Re: [PATCH net-next] xen-netback: Follow-up patch for grant mapping series |
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On 21/03/14 09:41, Ian Campbell wrote: > On Thu, 2014-03-20 at 19:32 +0000, Zoltan Kiss wrote: >> Ian made some late comments about the grant mapping series, I incorporated the >> outcomes into this patch. Additional comments, refactoring etc. > > I don't know how davem feels about merging these kinds of thing into one > patch but from my point of view the least thing to do is to enumerate > the cleanups -- so that people can verify that the patch does infact do > exactly what it says it does, no more, no less. Ok, I'll make a detailed list in the commit message about what are the changes, and fix up the typos you mentioned below. > >> Signed-off-by: Zoltan Kiss <zoltan.kiss@citrix.com> >> --- >> diff --git a/drivers/net/xen-netback/interface.c b/drivers/net/xen-netback/interface.c >> index 6837bfc..fa19538 100644 >> --- a/drivers/net/xen-netback/interface.c >> +++ b/drivers/net/xen-netback/interface.c >> @@ -576,15 +576,15 @@ 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) * >> @@ -599,6 +599,13 @@ 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 mchecking again. We shouldn't exit here until > > "checking" > >> + * dealloc thread and NAPI instance release all the >> + * pages. If a kernel bug cause the skbs stall > > "causes the skbs to stall" > >> + * somewhere, the interface couldn't be brought down >> + * properly. > > I'm not sure what you are saying here exactly. Perhaps you means > s/couldn't/cannot/? > >> + */ >> i = -1; >> } >> } >> diff --git a/drivers/net/xen-netback/netback.c b/drivers/net/xen-netback/netback.c >> index 1c336f6..0e46184b 100644 >> --- a/drivers/net/xen-netback/netback.c >> +++ b/drivers/net/xen-netback/netback.c >> @@ -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); >> @@ -99,6 +99,9 @@ static inline unsigned long idx_to_kaddr(struct xenvif *vif, >> return (unsigned long)pfn_to_kaddr(idx_to_pfn(vif, idx)); >> } >> >> +#define callback_param(vif, pending_idx) \ >> + (vif->pending_tx_info[pending_idx].callback_struct) >> + >> /* Find the containing VIF's structure from a pointer in pending_tx_info array >> */ >> static inline struct xenvif* ubuf_to_vif(struct ubuf_info *ubuf) >> @@ -1025,12 +1028,12 @@ static void xenvif_fill_frags(struct xenvif *vif, struct sk_buff *skb) >> /* If this is not the first frag, chain it to the previous*/ >> if (unlikely(prev_pending_idx == INVALID_PENDING_IDX)) >> skb_shinfo(skb)->destructor_arg = >> - &vif->pending_tx_info[pending_idx].callback_struct; >> + &callback_param(vif, pending_idx); >> else if (likely(pending_idx != prev_pending_idx)) >> - vif->pending_tx_info[prev_pending_idx].callback_struct.ctx = >> - &(vif->pending_tx_info[pending_idx].callback_struct); >> + callback_param(vif, prev_pending_idx).ctx = >> + &callback_param(vif, pending_idx); >> >> - vif->pending_tx_info[pending_idx].callback_struct.ctx = NULL; >> + callback_param(vif, pending_idx).ctx = NULL; >> prev_pending_idx = pending_idx; >> >> txp = &vif->pending_tx_info[pending_idx].req; >> @@ -1400,13 +1403,13 @@ static int xenvif_tx_submit(struct xenvif *vif) >> memcpy(skb->data, >> (void *)(idx_to_kaddr(vif, pending_idx)|txp->offset), >> data_len); >> - vif->pending_tx_info[pending_idx].callback_struct.ctx = NULL; >> + callback_param(vif, pending_idx).ctx = NULL; >> if (data_len < txp->size) { >> /* Append the packet payload as a fragment. */ >> txp->offset += data_len; >> txp->size -= data_len; >> skb_shinfo(skb)->destructor_arg = >> - &vif->pending_tx_info[pending_idx].callback_struct; >> + &callback_param(vif, pending_idx); >> } else { >> /* Schedule a response immediately. */ >> xenvif_idx_unmap(vif, pending_idx); >> @@ -1550,7 +1553,6 @@ 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; >> } >> @@ -1683,12 +1685,20 @@ 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, >> &vif->mmap_pages[pending_idx], 1); >> - BUG_ON(ret); >> + if (ret) { >> + netdev_err(vif->dev, >> + "Unmap fail: ret: %d pending_idx: %d host_addr: %llx handle: %x status: %d\n", >> + ret, >> + pending_idx, >> + tx_unmap_op.host_addr, >> + tx_unmap_op.handle, >> + tx_unmap_op.status); >> + BUG(); >> + } >> >> xenvif_idx_release(vif, pending_idx, XEN_NETIF_RSP_OKAY); >> } > >
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