From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:44865) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1cobbJ-00026F-Pz for qemu-devel@nongnu.org; Thu, 16 Mar 2017 16:02:26 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1cobbI-0003J3-Jn for qemu-devel@nongnu.org; Thu, 16 Mar 2017 16:02:21 -0400 Received: from mail.kernel.org ([198.145.29.136]:45954) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1cobbI-0003In-DI for qemu-devel@nongnu.org; Thu, 16 Mar 2017 16:02:20 -0400 From: Stefano Stabellini Date: Thu, 16 Mar 2017 13:01:55 -0700 Message-Id: <1489694518-16978-6-git-send-email-sstabellini@kernel.org> In-Reply-To: <1489694518-16978-1-git-send-email-sstabellini@kernel.org> References: <1489694518-16978-1-git-send-email-sstabellini@kernel.org> Subject: [Qemu-devel] [PATCH v3 6/9] xen/9pfs: receive requests from the frontend List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org Cc: xen-devel@lists.xenproject.org, sstabellini@kernel.org, jgross@suse.com, groug@kaod.org, Stefano Stabellini , anthony.perard@citrix.com, "Aneesh Kumar K.V" 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 CC: anthony.perard@citrix.com CC: jgross@suse.com CC: Aneesh Kumar K.V CC: Greg Kurz --- 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 From mboxrd@z Thu Jan 1 00:00:00 1970 From: Stefano Stabellini Subject: [PATCH v3 6/9] xen/9pfs: receive requests from the frontend Date: Thu, 16 Mar 2017 13:01:55 -0700 Message-ID: <1489694518-16978-6-git-send-email-sstabellini@kernel.org> References: <1489694518-16978-1-git-send-email-sstabellini@kernel.org> Mime-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Return-path: Received: from mail6.bemta6.messagelabs.com ([193.109.254.103]) by lists.xenproject.org with esmtp (Exim 4.84_2) (envelope-from ) id 1cobbN-00069G-3M for xen-devel@lists.xenproject.org; Thu, 16 Mar 2017 20:02:25 +0000 In-Reply-To: <1489694518-16978-1-git-send-email-sstabellini@kernel.org> List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: xen-devel-bounces@lists.xen.org Sender: "Xen-devel" To: qemu-devel@nongnu.org Cc: jgross@suse.com, sstabellini@kernel.org, groug@kaod.org, Stefano Stabellini , "Aneesh Kumar K.V" , anthony.perard@citrix.com, xen-devel@lists.xenproject.org List-Id: xen-devel@lists.xenproject.org VXBvbiByZWNlaXZpbmcgYW4gZXZlbnQgY2hhbm5lbCBub3RpZmljYXRpb24gZnJvbSB0aGUgZnJv bnRlbmQsIHNjaGVkdWxlCnRoZSBib3R0b20gaGFsZi4gRnJvbSB0aGUgYm90dG9tIGhhbGYsIHJl YWQgb25lIHJlcXVlc3QgZnJvbSB0aGUgcmluZywKY3JlYXRlIGEgcGR1IGFuZCBjYWxsIHBkdV9z dWJtaXQgdG8gaGFuZGxlIGl0LgoKRm9yIG5vdywgb25seSBoYW5kbGUgb25lIHJlcXVlc3QgcGVy IHJpbmcgYXQgYSB0aW1lLgoKU2lnbmVkLW9mZi1ieTogU3RlZmFubyBTdGFiZWxsaW5pIDxzdGVm YW5vQGFwb3JldG8uY29tPgpDQzogYW50aG9ueS5wZXJhcmRAY2l0cml4LmNvbQpDQzogamdyb3Nz QHN1c2UuY29tCkNDOiBBbmVlc2ggS3VtYXIgSy5WIDxhbmVlc2gua3VtYXJAbGludXgudm5ldC5p Ym0uY29tPgpDQzogR3JlZyBLdXJ6IDxncm91Z0BrYW9kLm9yZz4KLS0tCiBody85cGZzL3hlbi05 cC1iYWNrZW5kLmMgfCA0OCArKysrKysrKysrKysrKysrKysrKysrKysrKysrKysrKysrKysrKysr KysrKysrKysKIDEgZmlsZSBjaGFuZ2VkLCA0OCBpbnNlcnRpb25zKCspCgpkaWZmIC0tZ2l0IGEv aHcvOXBmcy94ZW4tOXAtYmFja2VuZC5jIGIvaHcvOXBmcy94ZW4tOXAtYmFja2VuZC5jCmluZGV4 IDNmZDIwZmYuLmY3NTc1OTEgMTAwNjQ0Ci0tLSBhL2h3LzlwZnMveGVuLTlwLWJhY2tlbmQuYwor KysgYi9ody85cGZzL3hlbi05cC1iYWNrZW5kLmMKQEAgLTEwNCwxMiArMTA0LDYwIEBAIHN0YXRp YyBpbnQgeGVuXzlwZnNfaW5pdChzdHJ1Y3QgWGVuRGV2aWNlICp4ZW5kZXYpCiAgICAgcmV0dXJu IDA7CiB9CiAKK3N0YXRpYyBpbnQgeGVuXzlwZnNfcmVjZWl2ZShYZW45cGZzUmluZyAqcmluZykK K3sKKyAgICBQOU1zZ0hlYWRlciBoOworICAgIFJJTkdfSURYIGNvbnMsIHByb2QsIG1hc2tlZF9w cm9kLCBtYXNrZWRfY29uczsKKyAgICBWOWZzUERVICpwZHU7CisKKyAgICBpZiAocmluZy0+aW5w cm9ncmVzcykgeworICAgICAgICByZXR1cm4gMDsKKyAgICB9CisKKyAgICBjb25zID0gcmluZy0+ aW50Zi0+b3V0X2NvbnM7CisgICAgcHJvZCA9IHJpbmctPmludGYtPm91dF9wcm9kOworICAgIHhl bl9ybWIoKTsKKworICAgIGlmICh4ZW5fOXBmc19xdWV1ZWQocHJvZCwgY29ucywgWEVOXzlQRlNf UklOR19TSVpFKSA8IHNpemVvZihoKSkgeworICAgICAgICByZXR1cm4gMDsKKyAgICB9CisgICAg cmluZy0+aW5wcm9ncmVzcyA9IHRydWU7CisKKyAgICBtYXNrZWRfcHJvZCA9IHhlbl85cGZzX21h c2socHJvZCwgWEVOXzlQRlNfUklOR19TSVpFKTsKKyAgICBtYXNrZWRfY29ucyA9IHhlbl85cGZz X21hc2soY29ucywgWEVOXzlQRlNfUklOR19TSVpFKTsKKworICAgIHhlbl85cGZzX3JlYWRfcGFj a2V0KHJpbmctPnJpbmcub3V0LCBtYXNrZWRfcHJvZCwgJm1hc2tlZF9jb25zLAorICAgICAgICAg ICAgICAgICAgICAgICAgIFhFTl85UEZTX1JJTkdfU0laRSwgKHVpbnQ4X3QgKikgJmgsIHNpemVv ZihoKSk7CisKKyAgICAvKiBjYW5ub3QgZmFpbCwgYmVjYXVzZSB3ZSBvbmx5IGhhbmRsZSBvbmUg cmVxdWVzdCBwZXIgcmluZyBhdCBhIHRpbWUgKi8KKyAgICBwZHUgPSBwZHVfYWxsb2MoJnJpbmct PnByaXYtPnN0YXRlKTsKKyAgICBwZHUtPnNpemUgPSBsZTMyX3RvX2NwdShoLnNpemVfbGUpOwor ICAgIHBkdS0+aWQgPSBoLmlkOworICAgIHBkdS0+dGFnID0gbGUzMl90b19jcHUoaC50YWdfbGUp OworICAgIHJpbmctPm91dF9zaXplID0gbGUzMl90b19jcHUoaC5zaXplX2xlKTsKKyAgICByaW5n LT5vdXRfY29ucyA9IGNvbnMgKyBsZTMyX3RvX2NwdShoLnNpemVfbGUpOworCisgICAgcWVtdV9j b19xdWV1ZV9pbml0KCZwZHUtPmNvbXBsZXRlKTsKKyAgICBwZHVfc3VibWl0KHBkdSk7CisKKyAg ICByZXR1cm4gMDsKK30KKwogc3RhdGljIHZvaWQgeGVuXzlwZnNfYmgodm9pZCAqb3BhcXVlKQog eworICAgIFhlbjlwZnNSaW5nICpyaW5nID0gb3BhcXVlOworICAgIHhlbl85cGZzX3JlY2VpdmUo cmluZyk7CiB9CiAKIHN0YXRpYyB2b2lkIHhlbl85cGZzX2V2dGNobl9ldmVudCh2b2lkICpvcGFx dWUpCiB7CisgICAgWGVuOXBmc1JpbmcgKnJpbmcgPSBvcGFxdWU7CisgICAgZXZ0Y2huX3BvcnRf dCBwb3J0OworCisgICAgcG9ydCA9IHhlbmV2dGNobl9wZW5kaW5nKHJpbmctPmV2dGNobmRldik7 CisgICAgeGVuZXZ0Y2huX3VubWFzayhyaW5nLT5ldnRjaG5kZXYsIHBvcnQpOworCisgICAgcWVt dV9iaF9zY2hlZHVsZShyaW5nLT5iaCk7CiB9CiAKIHN0YXRpYyBpbnQgeGVuXzlwZnNfZnJlZShz dHJ1Y3QgWGVuRGV2aWNlICp4ZW5kZXYpCi0tIAoxLjkuMQoKCl9fX19fX19fX19fX19fX19fX19f X19fX19fX19fX19fX19fX19fX19fX19fX19fClhlbi1kZXZlbCBtYWlsaW5nIGxpc3QKWGVuLWRl dmVsQGxpc3RzLnhlbi5vcmcKaHR0cHM6Ly9saXN0cy54ZW4ub3JnL3hlbi1kZXZlbAo=