From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jason Wang Subject: Re: [RFC v3 4/5] virtio_ring: add event idx support in packed ring Date: Tue, 8 May 2018 17:34:40 +0800 Message-ID: <122277c6-d103-e1f6-d695-4d64e6934a51@redhat.com> References: <20180502184015-mutt-send-email-mst@kernel.org> <20180503011116.qvoyblcpklinrk26@debian> <20180503044218-mutt-send-email-mst@kernel.org> <20180503020949.5u3qz32gsk33z6vk@debian> <9f0b4e37-63ff-42f9-f2e6-3747a19a0206@redhat.com> <20180503135430.lbtvn4p4lyu3ksqo@debian> <12ede490-f674-2b89-d639-266b5fe15466@redhat.com> <20180508064409.kcn6amhsxu7nkuuc@debian> <34f2c690-7cb2-f9ea-2ce9-40f4ccb594c9@redhat.com> <20180508091628.d7jzpopqopq4abhy@debian> Mime-Version: 1.0 Content-Type: text/plain; charset="utf-8"; Format="flowed" Content-Transfer-Encoding: base64 Cc: "Michael S. Tsirkin" , netdev@vger.kernel.org, linux-kernel@vger.kernel.org, virtualization@lists.linux-foundation.org, wexu@redhat.com To: Tiwei Bie Return-path: In-Reply-To: <20180508091628.d7jzpopqopq4abhy@debian> Content-Language: en-US List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: virtualization-bounces@lists.linux-foundation.org Errors-To: virtualization-bounces@lists.linux-foundation.org List-Id: netdev.vger.kernel.org CgpPbiAyMDE45bm0MDXmnIgwOOaXpSAxNzoxNiwgVGl3ZWkgQmllIHdyb3RlOgo+IE9uIFR1ZSwg TWF5IDA4LCAyMDE4IGF0IDAzOjE2OjUzUE0gKzA4MDAsIEphc29uIFdhbmcgd3JvdGU6Cj4+IE9u IDIwMTjlubQwNeaciDA45pelIDE0OjQ0LCBUaXdlaSBCaWUgd3JvdGU6Cj4+PiBPbiBUdWUsIE1h eSAwOCwgMjAxOCBhdCAwMTo0MDo0MFBNICswODAwLCBKYXNvbiBXYW5nIHdyb3RlOgo+Pj4+IE9u IDIwMTjlubQwNeaciDA45pelIDExOjA1LCBKYXNvbiBXYW5nIHdyb3RlOgo+Pj4+Pj4gQmVjYXVz ZSBpbiB2aXJ0cXVldWVfZW5hYmxlX2NiX2RlbGF5ZWQoKSwgd2UgbWF5IHNldCBhbgo+Pj4+Pj4g ZXZlbnRfb2ZmIHdoaWNoIGlzIGJpZ2dlciB0aGFuIG5ldyBhbmQgYm90aCBvZiB0aGVtIGhhdmUK Pj4+Pj4+IHdyYXBwZWQuIEFuZCBpbiB0aGlzIGNhc2UsIGFsdGhvdWdoIG5ldyBpcyBzbWFsbGVy IHRoYW4KPj4+Pj4+IGV2ZW50X29mZiAoaS5lLiB0aGUgdGhpcmQgcGFyYW0gLS0gb2xkKSwgbmV3 IHNob3VsZG4ndAo+Pj4+Pj4gYWRkIHZxLT5udW0sIGFuZCBhY3R1YWxseSB3ZSBhcmUgZXhwZWN0 aW5nIGEgdmVyeSBiaWcKPj4+Pj4+IGlkeCBkaWZmLgo+Pj4+PiBZZXMsIHNvIHRvIGNhbGN1bGF0 ZSBkaXN0YW5jZSBjb3JyZWN0bHkgYmV0d2VlbiBldmVudCBhbmQgbmV3LCB3ZSBqdXN0Cj4+Pj4+ IG5lZWQgdG8gY29tcGFyZSB0aGUgd2FycCBjb3VudGVyIGFuZCByZXR1cm4gZmFsc2UgaWYgaXQg ZG9lc24ndCBtYXRjaAo+Pj4+PiB3aXRob3V0IHRoZSBuZWVkIHRvIHRyeSB0byBhZGQgdnEubnVt IGhlcmUuCj4+Pj4+Cj4+Pj4+IFRoYW5rcwo+Pj4+IFNvcnJ5LCBsb29rcyBsaWtlIHRoZSBmb2xs b3dpbmcgc2hvdWxkIHdvcmssIHdlIG5lZWQgYWRkIHZxLm51bSBpZgo+Pj4+IHVzZWRfd3JhcF9j b3VudGVyIGRvZXMgbm90IG1hdGNoOgo+Pj4+Cj4+Pj4gc3RhdGljIGJvb2wgdmhvc3RfdnJpbmdf cGFja2VkX25lZWRfZXZlbnQoc3RydWN0IHZob3N0X3ZpcnRxdWV1ZSAqdnEsCj4+Pj4gICDCoMKg wqAgwqDCoMKgIMKgwqDCoCDCoMKgwqAgwqDCoMKgIMKgIF9fdTE2IG9mZl93cmFwLCBfX3UxNiBu ZXcsCj4+Pj4gICDCoMKgwqAgwqDCoMKgIMKgwqDCoCDCoMKgwqAgwqDCoMKgIMKgIF9fdTE2IG9s ZCkKPj4+PiB7Cj4+Pj4gICDCoMKgwqAgYm9vbCB3cmFwID0gb2ZmX3dyYXAgPj4gMTU7Cj4+Pj4g ICDCoMKgwqAgaW50IG9mZiA9IG9mZl93cmFwICYgfigxIDw8IDE1KTsKPj4+PiAgIMKgwqDCoCBf X3UxNiBkMSwgZDI7Cj4+Pj4KPj4+PiAgIMKgwqDCoCBpZiAod3JhcCAhPSB2cS0+dXNlZF93cmFw X2NvdW50ZXIpCj4+Pj4gICDCoMKgwqAgwqDCoMKgIGQxID0gbmV3ICsgdnEtPm51bSAtIG9mZiAt IDE7Cj4+PiBKdXN0IHRvIGRyYXcgeW91ciBhdHRlbnRpb24gKG1heWJlIHlvdSBoYXZlIGFscmVh ZHkKPj4+IG5vdGljZWQgdGhpcykuCj4+IEkgbWlzcyB0aGlzLCB0aGFua3MhCj4+Cj4+PiBJbiB0 aGlzIGNhc2UgKGkuZS4gd3JhcCAhPSB2cS0+dXNlZF93cmFwX2NvdW50ZXIpLAo+Pj4gaXQncyBh bHNvIHBvc3NpYmxlIHRoYXQgKG9mZiA8IG5ldykgaXMgdHJ1ZS4gQmVjYXVzZSwKPj4+Cj4+PiB3 aGVuIHZpcnRxdWV1ZV9lbmFibGVfY2JfZGVsYXllZF9wYWNrZWQoKSBpcyB1c2VkLAo+Pj4gYG9m ZmAgaXMgY2FsY3VsYXRlZCBpbiBkcml2ZXIgaW4gYSB3YXkgbGlrZSB0aGlzOgo+Pj4KPj4+IAlv ZmYgPSB2cS0+bGFzdF91c2VkX2lkeCArIGJ1ZnM7Cj4+PiAJaWYgKG9mZiA+PSB2cS0+dnJpbmdf cGFja2VkLm51bSkgewo+Pj4gCQlvZmYgLT0gdnEtPnZyaW5nX3BhY2tlZC5udW07Cj4+PiAJCXdy YXBfY291bnRlciBePSAxOwo+Pj4gCX0KPj4+Cj4+PiBBbmQgd2hlbiBgbmV3YCAoaW4gdmhvc3Qp IGlzIGNsb3NlIHRvIHZxLT5udW0uIFRoZQo+Pj4gdnEtPmxhc3RfdXNlZF9pZHggKyBidWZzIChp biBkcml2ZXIpIGNhbiBiZSBiaWdnZXIKPj4+IHRoYW4gdnEtPnZyaW5nX3BhY2tlZC5udW0sIGFu ZDoKPj4+Cj4+PiAxLiBgb2ZmYCB3aWxsIHdyYXA7Cj4+PiAyLiB3cmFwIGNvdW50ZXJzIHdvbid0 IG1hdGNoOwo+Pj4gMy4gb2ZmIDwgbmV3Owo+Pj4KPj4+IEFuZCBkMSAoaS5lLiBuZXcgKyB2cS0+ bnVtIC0gb2ZmIC0gMSkgd2lsbCBiZSBhIHZhbHVlCj4+PiBiaWdnZXIgdGhhbiB2cS0+bnVtLiBJ J20gb2theSB3aXRoIHRoaXMsIGFsdGhvdWdoIGl0J3MKPj4+IGEgYml0IHdlaXJkLgo+Pgo+PiBT byBJJ20gY29uc2lkZXJpbmcgc29tZXRoaW5nIG1vcmUgY29tcGFjdCBieSByZXVzaW5nIHZyaW5n X25lZWRfZXZlbnQoKSBieQo+PiBwcmV0ZW5kaW5nIGEgbGFyZ2VyIHF1ZXVlIHNpemUgYW5kIGFk ZGluZyB2cS0+bnVtIGJhY2sgd2hlbiBuZWNlc3Nhcnk6Cj4+Cj4+IHN0YXRpYyBib29sIHZob3N0 X3ZyaW5nX3BhY2tlZF9uZWVkX2V2ZW50KHN0cnVjdCB2aG9zdF92aXJ0cXVldWUgKnZxLAo+PiAg wqDCoMKgIMKgwqDCoCDCoMKgwqAgwqDCoMKgIMKgwqDCoCDCoCBfX3UxNiBvZmZfd3JhcCwgX191 MTYgbmV3LAo+PiAgwqDCoMKgIMKgwqDCoCDCoMKgwqAgwqDCoMKgIMKgwqDCoCDCoCBfX3UxNiBv bGQpCj4+IHsKPj4gIMKgwqDCoCBib29sIHdyYXAgPSB2cS0+dXNlZF93cmFwX2NvdW50ZXI7Cj4g SWYgdGhlIHdyYXAgY291bnRlciBpcyBvYnRhaW5lZCBmcm9tIHRoZSB2cSwKPiBJIHRoaW5rIGBu ZXdgIHNob3VsZCBhbHNvIGJlIG9idGFpbmVkIGZyb20KPiB0aGUgdnEuIE9yIHRoZSB3cmFwIGNv dW50ZXIgc2hvdWxkIGJlIGNhcnJpZWQKPiBpbiBgbmV3YC4KPgo+PiAgwqDCoMKgIGludCBvZmYg PSBvZmZfd3JhcCAmIH4oMSA8PCAxNSk7Cj4+ICDCoMKgwqAgX191MTYgZDEsIGQyOwo+Pgo+PiAg wqDCoMKgIGlmIChuZXcgPCBvbGQpIHsKPj4gIMKgwqDCoCDCoMKgwqAgbmV3ICs9IHZxLT5udW07 Cj4+ICDCoMKgwqAgwqDCoMKgIHdyYXAgXj0gMTsKPj4gIMKgwqDCoCB9Cj4+Cj4+ICDCoMKgwqAg aWYgKHdyYXAgIT0gb2ZmX3dyYXAgPj4gMTUpCj4+ICDCoMKgwqAgwqDCoMKgIG9mZiArPSB2cS0+ bnVtOwo+IFdoZW4gYG5ld2AgYW5kIGBvbGRgIHdyYXBzLCBhbmQgYG9mZmAgZG9lc24ndCB3cmFw LAo+IHdyYXAgIT0gKG9mZl93cmFwID4+IDE1KSB3aWxsIGJlIHRydWUuIEluIHRoaXMgY2FzZSwK PiBgb2ZmYCBpcyBiaWdnZXIgdGhhbiBgbmV3YCwgYW5kIHdoYXQgd2Ugc2hvdWxkIGRvCj4gaXMg YG9mZiAtPSB2cS0+bnVtYCBpbnN0ZWFkIG9mIGBvZmYgKz0gdnEtPm51bWAuCgpJZiBJIHVuZGVy c3RhbmQgdGhpcyBjb3JyZWN0bHksIGlmIHdlIHRyYWNrIG9sZCBjb3JyZWN0bHksIGl0IHdvbid0 IApoYXBwZW4gaWYgZ3Vlc3QgZHJpdmVyIGJlaGF2ZSBjb3JyZWN0bHkuIFRoYXQgbWVhbnMgaXQg c2hvdWxkIG9ubHkgCmhhcHBlbiBmb3IgYSBidWdneSBkcml2ZXIgKGUuZyB0cnlpbmcgdG8gbW92 ZSBvZmZfd3JhcCBiYWNrKS4KClRoYW5rcwoKPgo+IEJlc3QgcmVnYXJkcywKPiBUaXdlaSBCaWUK Pgo+PiAgwqDCoMKgIHJldHVybiB2cmluZ19uZWVkX2V2ZW50KG9mZiwgbmV3LCBvbGQpOwo+PiB9 Cj4+Cj4+Cj4+PiBCZXN0IHJlZ2FyZHMsCj4+PiBUaXdlaSBCaWUKPj4+Cj4+Pj4gICDCoMKgwqAg ZWxzZQo+Pj4+ICAgwqDCoMKgIMKgwqDCoCBkMSA9IG5ldyAtIG9mZiAtIDE7Cj4+Pj4KPj4+PiAg IMKgwqDCoCBpZiAobmV3ID4gb2xkKQo+Pj4+ICAgwqDCoMKgIMKgwqDCoCBkMiA9IG5ldyAtIG9s ZDsKPj4+PiAgIMKgwqDCoCBlbHNlCj4+Pj4gICDCoMKgwqAgwqDCoMKgIGQyID0gbmV3ICsgdnEt Pm51bSAtIG9sZDsKPj4+Pgo+Pj4+ICAgwqDCoMKgIHJldHVybiBkMSA8IGQyOwo+Pj4+IH0KPj4+ Pgo+Pj4+IFRoYW5rcwo+Pj4+CgpfX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19f X19fX19fX19fXwpWaXJ0dWFsaXphdGlvbiBtYWlsaW5nIGxpc3QKVmlydHVhbGl6YXRpb25AbGlz dHMubGludXgtZm91bmRhdGlvbi5vcmcKaHR0cHM6Ly9saXN0cy5saW51eGZvdW5kYXRpb24ub3Jn L21haWxtYW4vbGlzdGluZm8vdmlydHVhbGl6YXRpb24=