From: Boris Ostrovsky <boris.ostrovsky@oracle.com> To: Stefano Stabellini <sstabellini@kernel.org> Cc: xen-devel@lists.xenproject.org, linux-kernel@vger.kernel.org, Stefano Stabellini <stefano@aporeto.com>, jgross@suse.com, Eric Van Hensbergen <ericvh@gmail.com>, Ron Minnich <rminnich@sandia.gov>, Latchesar Ionkov <lucho@ionkov.net>, v9fs-developer@lists.sourceforge.net Subject: Re: [PATCH 4/7] xen/9pfs: connect to the backend Date: Wed, 8 Mar 2017 08:47:45 -0500 [thread overview] Message-ID: <7a016728-5a22-6ab0-a34a-4f7354927cf1@oracle.com> (raw) In-Reply-To: <alpine.DEB.2.10.1703071557470.17906@sstabellini-ThinkPad-X260> > >>> + ring->bytes = (void*)__get_free_pages(GFP_KERNEL | __GFP_ZERO, XEN_9PFS_RING_ORDER); >>> + if (ring->bytes == NULL) >>> + goto error; >>> + for (i = 0; i < (1 << XEN_9PFS_RING_ORDER); i++) >>> + ring->intf->ref[i] = gnttab_grant_foreign_access(dev->otherend_id, pfn_to_gfn(virt_to_pfn((void*)ring->bytes) + i), 0); >>> + ring->ref = gnttab_grant_foreign_access(dev->otherend_id, pfn_to_gfn(virt_to_pfn((void*)ring->intf)), 0); >>> + ring->ring.in = ring->bytes; >>> + ring->ring.out = ring->bytes + XEN_9PFS_RING_SIZE; >>> + >>> + ret = xenbus_alloc_evtchn(dev, &ring->evtchn); >>> + if (ret) >>> + goto error; >>> + ring->irq = bind_evtchn_to_irqhandler(ring->evtchn, xen_9pfs_front_event_handler, >>> + 0, "xen_9pfs-frontend", ring); >>> + if (ring->irq < 0) { >>> + xenbus_free_evtchn(dev, ring->evtchn); >>> + ret = ring->irq; >>> + goto error; >>> + } >>> return 0; >>> + >>> +error: >> You may need to gnttab_end_foreign_access(). > Actually this error path is unnecessary because it will be handled by > xen_9pfs_front_probe, that calls xen_9pfs_front_free on errors. I'll > remove it. (It's a matter of personal preference but I think a routine should clean up its own mess whenever it can.) > > > + > + again: > + ret = xenbus_transaction_start(&xbt); > + if (ret) { > + xenbus_dev_fatal(dev, ret, "starting transaction"); > + goto error; > + } > + ret = xenbus_printf(xbt, dev->nodename, "version", "%u", 1); > + if (ret) > + goto error_xenbus; > + ret = xenbus_printf(xbt, dev->nodename, "num-rings", "%u", priv->num_rings); > + if (ret) > + goto error_xenbus; > + for (i = 0; i < priv->num_rings; i++) { > + char str[16]; > + > + priv->rings[i].priv = priv; > + ret = xen_9pfs_front_alloc_dataring(dev, &priv->rings[i]); >> Not for -EAGAIN, I think. > I don't think xen_9pfs_front_alloc_dataring can return EAGAIN. EAGAIN > can only come from xenbus_transaction_end, the case we handle below. I didn't mean that xen_9pfs_front_alloc_dataring() can return -EAGAIN. I was referring to... > > >>> + if (ret < 0) >>> + goto error_xenbus; >>> + >>> + sprintf(str, "ring-ref%u", i); >>> + ret = xenbus_printf(xbt, dev->nodename, str, "%d", priv->rings[i].ref); >>> + if (ret) >>> + goto error_xenbus; >>> + >>> + sprintf(str, "event-channel-%u", i); >>> + ret = xenbus_printf(xbt, dev->nodename, str, "%u", priv->rings[i].evtchn); >>> + if (ret) >>> + goto error_xenbus; >>> + } >>> + priv->tag = xenbus_read(xbt, dev->nodename, "tag", NULL); >>> + if (ret) >>> + goto error_xenbus; >>> + ret = xenbus_transaction_end(xbt, 0); >>> + if (ret) { >>> + if (ret == -EAGAIN) >>> + goto again; ... this. Sorry for not being clear. -boris
WARNING: multiple messages have this Message-ID (diff)
From: Boris Ostrovsky <boris.ostrovsky@oracle.com> To: Stefano Stabellini <sstabellini@kernel.org> Cc: jgross@suse.com, Latchesar Ionkov <lucho@ionkov.net>, Eric Van Hensbergen <ericvh@gmail.com>, linux-kernel@vger.kernel.org, Stefano Stabellini <stefano@aporeto.com>, v9fs-developer@lists.sourceforge.net, Ron Minnich <rminnich@sandia.gov>, xen-devel@lists.xenproject.org Subject: Re: [PATCH 4/7] xen/9pfs: connect to the backend Date: Wed, 8 Mar 2017 08:47:45 -0500 [thread overview] Message-ID: <7a016728-5a22-6ab0-a34a-4f7354927cf1@oracle.com> (raw) In-Reply-To: <alpine.DEB.2.10.1703071557470.17906@sstabellini-ThinkPad-X260> > >>> + ring->bytes = (void*)__get_free_pages(GFP_KERNEL | __GFP_ZERO, XEN_9PFS_RING_ORDER); >>> + if (ring->bytes == NULL) >>> + goto error; >>> + for (i = 0; i < (1 << XEN_9PFS_RING_ORDER); i++) >>> + ring->intf->ref[i] = gnttab_grant_foreign_access(dev->otherend_id, pfn_to_gfn(virt_to_pfn((void*)ring->bytes) + i), 0); >>> + ring->ref = gnttab_grant_foreign_access(dev->otherend_id, pfn_to_gfn(virt_to_pfn((void*)ring->intf)), 0); >>> + ring->ring.in = ring->bytes; >>> + ring->ring.out = ring->bytes + XEN_9PFS_RING_SIZE; >>> + >>> + ret = xenbus_alloc_evtchn(dev, &ring->evtchn); >>> + if (ret) >>> + goto error; >>> + ring->irq = bind_evtchn_to_irqhandler(ring->evtchn, xen_9pfs_front_event_handler, >>> + 0, "xen_9pfs-frontend", ring); >>> + if (ring->irq < 0) { >>> + xenbus_free_evtchn(dev, ring->evtchn); >>> + ret = ring->irq; >>> + goto error; >>> + } >>> return 0; >>> + >>> +error: >> You may need to gnttab_end_foreign_access(). > Actually this error path is unnecessary because it will be handled by > xen_9pfs_front_probe, that calls xen_9pfs_front_free on errors. I'll > remove it. (It's a matter of personal preference but I think a routine should clean up its own mess whenever it can.) > > > + > + again: > + ret = xenbus_transaction_start(&xbt); > + if (ret) { > + xenbus_dev_fatal(dev, ret, "starting transaction"); > + goto error; > + } > + ret = xenbus_printf(xbt, dev->nodename, "version", "%u", 1); > + if (ret) > + goto error_xenbus; > + ret = xenbus_printf(xbt, dev->nodename, "num-rings", "%u", priv->num_rings); > + if (ret) > + goto error_xenbus; > + for (i = 0; i < priv->num_rings; i++) { > + char str[16]; > + > + priv->rings[i].priv = priv; > + ret = xen_9pfs_front_alloc_dataring(dev, &priv->rings[i]); >> Not for -EAGAIN, I think. > I don't think xen_9pfs_front_alloc_dataring can return EAGAIN. EAGAIN > can only come from xenbus_transaction_end, the case we handle below. I didn't mean that xen_9pfs_front_alloc_dataring() can return -EAGAIN. I was referring to... > > >>> + if (ret < 0) >>> + goto error_xenbus; >>> + >>> + sprintf(str, "ring-ref%u", i); >>> + ret = xenbus_printf(xbt, dev->nodename, str, "%d", priv->rings[i].ref); >>> + if (ret) >>> + goto error_xenbus; >>> + >>> + sprintf(str, "event-channel-%u", i); >>> + ret = xenbus_printf(xbt, dev->nodename, str, "%u", priv->rings[i].evtchn); >>> + if (ret) >>> + goto error_xenbus; >>> + } >>> + priv->tag = xenbus_read(xbt, dev->nodename, "tag", NULL); >>> + if (ret) >>> + goto error_xenbus; >>> + ret = xenbus_transaction_end(xbt, 0); >>> + if (ret) { >>> + if (ret == -EAGAIN) >>> + goto again; ... this. Sorry for not being clear. -boris _______________________________________________ Xen-devel mailing list Xen-devel@lists.xen.org https://lists.xen.org/xen-devel
next prev parent reply other threads:[~2017-03-08 13:50 UTC|newest] Thread overview: 77+ messages / expand[flat|nested] mbox.gz Atom feed top 2017-03-06 20:00 [PATCH 0/7] Xen transport for 9pfs frontend driver Stefano Stabellini 2017-03-06 20:01 ` [PATCH 1/7] xen: import new ring macros in ring.h Stefano Stabellini 2017-03-06 20:01 ` Stefano Stabellini 2017-03-06 20:01 ` [PATCH 2/7] xen: introduce the header file for the Xen 9pfs transport protocol Stefano Stabellini 2017-03-06 20:01 ` Stefano Stabellini 2017-03-06 21:22 ` Boris Ostrovsky 2017-03-06 21:22 ` Boris Ostrovsky 2017-03-06 21:36 ` Stefano Stabellini 2017-03-06 21:36 ` Stefano Stabellini 2017-03-06 21:42 ` Boris Ostrovsky 2017-03-06 21:42 ` Boris Ostrovsky 2017-03-06 20:01 ` [PATCH 3/7] xen/9pfs: introduce Xen 9pfs transport driver Stefano Stabellini 2017-03-06 20:01 ` Stefano Stabellini 2017-03-06 20:01 ` [PATCH 4/7] xen/9pfs: connect to the backend Stefano Stabellini 2017-03-06 20:01 ` Stefano Stabellini 2017-03-07 15:03 ` Boris Ostrovsky 2017-03-07 15:03 ` Boris Ostrovsky 2017-03-08 0:11 ` Stefano Stabellini 2017-03-08 0:11 ` Stefano Stabellini 2017-03-08 13:47 ` Boris Ostrovsky [this message] 2017-03-08 13:47 ` Boris Ostrovsky 2017-03-08 19:22 ` Stefano Stabellini 2017-03-08 19:22 ` Stefano Stabellini 2017-03-07 17:37 ` [Xen-devel] " Julien Grall 2017-03-07 17:37 ` Julien Grall 2017-03-08 0:49 ` [Xen-devel] " Stefano Stabellini 2017-03-08 0:49 ` Stefano Stabellini 2017-03-08 12:25 ` [Xen-devel] " Julien Grall 2017-03-08 12:25 ` Julien Grall 2017-03-08 19:08 ` [Xen-devel] " Stefano Stabellini 2017-03-08 19:08 ` Stefano Stabellini 2017-03-06 20:01 ` [PATCH 5/7] xen/9pfs: send requests " Stefano Stabellini 2017-03-06 20:01 ` Stefano Stabellini 2017-03-07 15:27 ` Boris Ostrovsky 2017-03-07 15:27 ` Boris Ostrovsky 2017-03-08 0:55 ` Stefano Stabellini 2017-03-08 0:55 ` Stefano Stabellini 2017-03-08 13:58 ` Boris Ostrovsky 2017-03-08 13:58 ` Boris Ostrovsky 2017-03-08 19:33 ` Stefano Stabellini 2017-03-08 19:33 ` Stefano Stabellini 2017-03-08 20:02 ` Boris Ostrovsky 2017-03-08 20:02 ` Boris Ostrovsky 2017-03-08 20:56 ` Stefano Stabellini 2017-03-08 20:56 ` Stefano Stabellini 2017-03-08 21:01 ` Boris Ostrovsky 2017-03-08 21:01 ` Boris Ostrovsky 2017-03-06 20:01 ` [PATCH 6/7] xen/9pfs: receive responses Stefano Stabellini 2017-03-06 20:01 ` Stefano Stabellini 2017-03-07 15:49 ` Boris Ostrovsky 2017-03-07 15:49 ` Boris Ostrovsky 2017-03-08 1:06 ` Stefano Stabellini 2017-03-08 1:06 ` Stefano Stabellini 2017-03-08 1:13 ` Stefano Stabellini 2017-03-08 1:13 ` Stefano Stabellini 2017-03-08 20:11 ` Konrad Rzeszutek Wilk 2017-03-08 20:11 ` [Xen-devel] " Konrad Rzeszutek Wilk 2017-03-08 14:33 ` Boris Ostrovsky 2017-03-08 14:33 ` Boris Ostrovsky 2017-03-08 19:26 ` Stefano Stabellini 2017-03-08 19:26 ` Stefano Stabellini 2017-03-06 20:01 ` [PATCH 7/7] xen/9pfs: build 9pfs Xen transport driver Stefano Stabellini 2017-03-06 20:01 ` Stefano Stabellini 2017-03-07 17:15 ` [Xen-devel] [PATCH 1/7] xen: import new ring macros in ring.h Julien Grall 2017-03-07 17:15 ` Julien Grall 2017-03-08 0:12 ` [Xen-devel] " Stefano Stabellini 2017-03-08 0:12 ` Stefano Stabellini 2017-03-08 11:14 ` [Xen-devel] " Julien Grall 2017-03-08 11:14 ` Julien Grall 2017-03-07 16:38 ` [Xen-devel] [PATCH 0/7] Xen transport for 9pfs frontend driver Roger Pau Monné 2017-03-07 16:38 ` Roger Pau Monné 2017-03-07 18:27 ` [Xen-devel] " Stefano Stabellini 2017-03-07 18:27 ` Stefano Stabellini 2017-03-09 3:02 ` [Xen-devel] " Roger Pau Monné 2017-03-09 3:02 ` Roger Pau Monné 2017-03-13 22:36 ` Stefano Stabellini 2017-03-13 22:36 ` [Xen-devel] " Stefano Stabellini
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