From: Stefano Stabellini <sstabellini@kernel.org> To: qemu-devel@nongnu.org Cc: xen-devel@lists.xenproject.org, sstabellini@kernel.org, jgross@suse.com, groug@kaod.org, Stefano Stabellini <stefano@aporeto.com>, anthony.perard@citrix.com, "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com> Subject: [Qemu-devel] [PATCH v3 6/9] xen/9pfs: receive requests from the frontend Date: Thu, 16 Mar 2017 13:01:55 -0700 [thread overview] Message-ID: <1489694518-16978-6-git-send-email-sstabellini@kernel.org> (raw) In-Reply-To: <1489694518-16978-1-git-send-email-sstabellini@kernel.org> Upon receiving an event channel notification from the frontend, schedule the bottom half. From the bottom half, read one request from the ring, create a pdu and call pdu_submit to handle it. For now, only handle one request per ring at a time. Signed-off-by: Stefano Stabellini <stefano@aporeto.com> CC: anthony.perard@citrix.com CC: jgross@suse.com CC: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> CC: Greg Kurz <groug@kaod.org> --- hw/9pfs/xen-9p-backend.c | 48 ++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 48 insertions(+) diff --git a/hw/9pfs/xen-9p-backend.c b/hw/9pfs/xen-9p-backend.c index 3fd20ff..f757591 100644 --- a/hw/9pfs/xen-9p-backend.c +++ b/hw/9pfs/xen-9p-backend.c @@ -104,12 +104,60 @@ static int xen_9pfs_init(struct XenDevice *xendev) return 0; } +static int xen_9pfs_receive(Xen9pfsRing *ring) +{ + P9MsgHeader h; + RING_IDX cons, prod, masked_prod, masked_cons; + V9fsPDU *pdu; + + if (ring->inprogress) { + return 0; + } + + cons = ring->intf->out_cons; + prod = ring->intf->out_prod; + xen_rmb(); + + if (xen_9pfs_queued(prod, cons, XEN_9PFS_RING_SIZE) < sizeof(h)) { + return 0; + } + ring->inprogress = true; + + masked_prod = xen_9pfs_mask(prod, XEN_9PFS_RING_SIZE); + masked_cons = xen_9pfs_mask(cons, XEN_9PFS_RING_SIZE); + + xen_9pfs_read_packet(ring->ring.out, masked_prod, &masked_cons, + XEN_9PFS_RING_SIZE, (uint8_t *) &h, sizeof(h)); + + /* cannot fail, because we only handle one request per ring at a time */ + pdu = pdu_alloc(&ring->priv->state); + pdu->size = le32_to_cpu(h.size_le); + pdu->id = h.id; + pdu->tag = le32_to_cpu(h.tag_le); + ring->out_size = le32_to_cpu(h.size_le); + ring->out_cons = cons + le32_to_cpu(h.size_le); + + qemu_co_queue_init(&pdu->complete); + pdu_submit(pdu); + + return 0; +} + static void xen_9pfs_bh(void *opaque) { + Xen9pfsRing *ring = opaque; + xen_9pfs_receive(ring); } static void xen_9pfs_evtchn_event(void *opaque) { + Xen9pfsRing *ring = opaque; + evtchn_port_t port; + + port = xenevtchn_pending(ring->evtchndev); + xenevtchn_unmask(ring->evtchndev, port); + + qemu_bh_schedule(ring->bh); } static int xen_9pfs_free(struct XenDevice *xendev) -- 1.9.1
WARNING: multiple messages have this Message-ID (diff)
From: Stefano Stabellini <sstabellini@kernel.org> To: qemu-devel@nongnu.org Cc: jgross@suse.com, sstabellini@kernel.org, groug@kaod.org, Stefano Stabellini <stefano@aporeto.com>, "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>, anthony.perard@citrix.com, xen-devel@lists.xenproject.org Subject: [PATCH v3 6/9] xen/9pfs: receive requests from the frontend Date: Thu, 16 Mar 2017 13:01:55 -0700 [thread overview] Message-ID: <1489694518-16978-6-git-send-email-sstabellini@kernel.org> (raw) In-Reply-To: <1489694518-16978-1-git-send-email-sstabellini@kernel.org> Upon receiving an event channel notification from the frontend, schedule the bottom half. From the bottom half, read one request from the ring, create a pdu and call pdu_submit to handle it. For now, only handle one request per ring at a time. Signed-off-by: Stefano Stabellini <stefano@aporeto.com> CC: anthony.perard@citrix.com CC: jgross@suse.com CC: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> CC: Greg Kurz <groug@kaod.org> --- hw/9pfs/xen-9p-backend.c | 48 ++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 48 insertions(+) diff --git a/hw/9pfs/xen-9p-backend.c b/hw/9pfs/xen-9p-backend.c index 3fd20ff..f757591 100644 --- a/hw/9pfs/xen-9p-backend.c +++ b/hw/9pfs/xen-9p-backend.c @@ -104,12 +104,60 @@ static int xen_9pfs_init(struct XenDevice *xendev) return 0; } +static int xen_9pfs_receive(Xen9pfsRing *ring) +{ + P9MsgHeader h; + RING_IDX cons, prod, masked_prod, masked_cons; + V9fsPDU *pdu; + + if (ring->inprogress) { + return 0; + } + + cons = ring->intf->out_cons; + prod = ring->intf->out_prod; + xen_rmb(); + + if (xen_9pfs_queued(prod, cons, XEN_9PFS_RING_SIZE) < sizeof(h)) { + return 0; + } + ring->inprogress = true; + + masked_prod = xen_9pfs_mask(prod, XEN_9PFS_RING_SIZE); + masked_cons = xen_9pfs_mask(cons, XEN_9PFS_RING_SIZE); + + xen_9pfs_read_packet(ring->ring.out, masked_prod, &masked_cons, + XEN_9PFS_RING_SIZE, (uint8_t *) &h, sizeof(h)); + + /* cannot fail, because we only handle one request per ring at a time */ + pdu = pdu_alloc(&ring->priv->state); + pdu->size = le32_to_cpu(h.size_le); + pdu->id = h.id; + pdu->tag = le32_to_cpu(h.tag_le); + ring->out_size = le32_to_cpu(h.size_le); + ring->out_cons = cons + le32_to_cpu(h.size_le); + + qemu_co_queue_init(&pdu->complete); + pdu_submit(pdu); + + return 0; +} + static void xen_9pfs_bh(void *opaque) { + Xen9pfsRing *ring = opaque; + xen_9pfs_receive(ring); } static void xen_9pfs_evtchn_event(void *opaque) { + Xen9pfsRing *ring = opaque; + evtchn_port_t port; + + port = xenevtchn_pending(ring->evtchndev); + xenevtchn_unmask(ring->evtchndev, port); + + qemu_bh_schedule(ring->bh); } static int xen_9pfs_free(struct XenDevice *xendev) -- 1.9.1 _______________________________________________ Xen-devel mailing list Xen-devel@lists.xen.org https://lists.xen.org/xen-devel
next prev parent reply other threads:[~2017-03-16 20:02 UTC|newest] Thread overview: 40+ messages / expand[flat|nested] mbox.gz Atom feed top 2017-03-16 20:00 [Qemu-devel] [PATCH v3 0/9] xen/9pfs: introduce the Xen 9pfs backend Stefano Stabellini 2017-03-16 20:00 ` Stefano Stabellini 2017-03-16 20:01 ` [Qemu-devel] [PATCH v3 1/9] xen: do not build backends for targets that do not support xen Stefano Stabellini 2017-03-16 20:01 ` Stefano Stabellini 2017-03-16 20:01 ` [Qemu-devel] [PATCH v3 2/9] xen: import ring.h from xen Stefano Stabellini 2017-03-16 20:01 ` Stefano Stabellini 2017-03-17 11:15 ` [Qemu-devel] " Greg Kurz 2017-03-17 11:15 ` Greg Kurz 2017-03-16 20:01 ` [Qemu-devel] [PATCH v3 3/9] 9p: introduce a type for the 9p header Stefano Stabellini 2017-03-16 20:01 ` Stefano Stabellini 2017-03-17 11:16 ` [Qemu-devel] " Greg Kurz 2017-03-17 11:16 ` Greg Kurz 2017-03-17 21:06 ` [Qemu-devel] " Philippe Mathieu-Daudé 2017-03-17 21:06 ` Philippe Mathieu-Daudé 2017-03-16 20:01 ` [Qemu-devel] [PATCH v3 4/9] xen/9pfs: introduce Xen 9pfs backend Stefano Stabellini 2017-03-16 20:01 ` Stefano Stabellini 2017-03-16 20:01 ` [Qemu-devel] [PATCH v3 5/9] xen/9pfs: connect to the frontend Stefano Stabellini 2017-03-16 20:01 ` Stefano Stabellini 2017-03-17 13:22 ` [Qemu-devel] " Greg Kurz 2017-03-17 13:22 ` Greg Kurz 2017-03-17 17:40 ` [Qemu-devel] " Stefano Stabellini 2017-03-17 17:40 ` Stefano Stabellini 2017-03-16 20:01 ` Stefano Stabellini [this message] 2017-03-16 20:01 ` [PATCH v3 6/9] xen/9pfs: receive requests from " Stefano Stabellini 2017-03-16 20:01 ` [Qemu-devel] [PATCH v3 7/9] xen/9pfs: implement in/out_iov_from_pdu and vmarshal/vunmarshal Stefano Stabellini 2017-03-16 20:01 ` Stefano Stabellini 2017-03-17 13:27 ` [Qemu-devel] " Greg Kurz 2017-03-17 13:27 ` Greg Kurz 2017-03-17 18:19 ` [Qemu-devel] " Stefano Stabellini 2017-03-17 18:19 ` Stefano Stabellini 2017-03-16 20:01 ` [Qemu-devel] [PATCH v3 8/9] xen/9pfs: send responses back to the frontend Stefano Stabellini 2017-03-16 20:01 ` Stefano Stabellini 2017-03-16 20:01 ` [Qemu-devel] [PATCH v3 9/9] xen/9pfs: build and register Xen 9pfs backend Stefano Stabellini 2017-03-16 20:01 ` Stefano Stabellini 2017-03-17 11:08 ` [Qemu-devel] [PATCH v3 1/9] xen: do not build backends for targets that do not support xen Greg Kurz 2017-03-17 11:08 ` Greg Kurz 2017-03-17 11:10 ` [Qemu-devel] " Paolo Bonzini 2017-03-17 11:10 ` Paolo Bonzini 2017-03-17 17:34 ` [Qemu-devel] " Stefano Stabellini 2017-03-17 17:34 ` Stefano Stabellini
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