From mboxrd@z Thu Jan 1 00:00:00 1970 From: Koichiro Den Subject: Re: [PATCH net-next] virtio-net: invoke zerocopy callback on xmit path if no tx napi Date: Tue, 22 Aug 2017 22:42:19 +0900 Message-ID: <1503409339.8694.12.camel@klaipeden.com> References: <20170819063854.27010-1-den@klaipeden.com> <5352c98a-fa48-fcf9-c062-9986a317a1b0@redhat.com> <64d451ae-9944-e978-5a05-54bb1a62aaad@redhat.com> Mime-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Return-path: In-Reply-To: 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 To: Willem de Bruijn , Jason Wang Cc: Network Development , virtualization@lists.linux-foundation.org, "Michael S. Tsirkin" List-Id: virtualization@lists.linuxfoundation.org T24gTW9uLCAyMDE3LTA4LTIxIGF0IDIzOjEwIC0wNDAwLCBXaWxsZW0gZGUgQnJ1aWpuIHdyb3Rl Ogo+ID4gPiA+IEludGVyZXN0aW5nLCBkZWFkbG9jayBjb3VsZCBiZSB0cmVhdGVkIGFzIGEgYSBy YWRpY2FsIGNhc2Ugb2YgdGhlCj4gPiA+ID4gZGlzY3Vzc2lvbgo+ID4gPiA+IGhlcmUgaHR0cHM6 Ly9wYXRjaHdvcmsua2VybmVsLm9yZy9wYXRjaC8zNzg3NjcxLy4KPiA+ID4gPiAKPiA+ID4gPiBn aXQgZ3JlcCB0ZWxscyBtb3JlIHNpbWlsYXIgc2tiX29ycGhhbigpIGNhc2VzLiBEbyB3ZSBuZWVk IHRvIGNoYW5nZQo+ID4gPiA+IHRoZW0KPiA+ID4gPiBhbGwgKG9yIHBhcnQpPwo+ID4gPiAKPiA+ ID4gTW9zdCBza2Jfb3JwaGFuIGNhbGxzIGFyZSBub3QgcmVsZXZhbnQgdG8gdGhlIGlzc3VlIG9m IHRyYW5zbWl0IGRlbGF5Lgo+ID4gCj4gPiAKPiA+IFllcywgYnV0IGF0IGxlYXN0IHdlIHNob3Vs ZCBhdWRpdCB0aGUgb25lcyBpbiBkcml2ZXJzL25ldC4KPiAKPiBEbyB5b3UgbWVhbiBvdGhlciB2 aXJ0dWFsIGRldmljZSBkcml2ZXIgdHJhbnNtaXQgcGF0aHMsIGxpa2UgeGVuLAo+IHNwZWNpZmlj YWxseT8KPiAKPiA+ID4gPiBBY3R1YWxseSwgd2UgbWF5IG1lZXQgc2ltaWxhciBpc3N1ZXMgYXQg bWFueSBvdGhlciBwbGFjZXMgKGUuZyBuZXRlbSkuCj4gPiA+IAo+ID4gPiBOZXRlbSBpcyBhbiBp bnRlcmVzdGluZyBjYXNlLiBCZWNhdXNlIGl0IGlzIGludGVuZGVkIHRvIG1pbWljIG5ldHdvcmsK PiA+ID4gZGVsYXksIGF0IGxlYXN0IGluIHRoZSBjYXNlIHdoZXJlIGl0IGNhbGxzIHNrYl9vcnBo YW4sIGl0IG1heSBtYWtlCj4gPiA+IHNlbnNlIHRvIHJlbGVhc2UgYWxsIHJlZmVyZW5jZXMsIGlu Y2x1ZGluZyBjYWxsaW5nIHNrYl96Y29weV9jbGVhci4KPiA+ID4gCj4gPiA+IEluIGdlbmVyYWws IHplcm9jb3B5IHJldmVydHMgdG8gY29weSBvbiBhbGwgcGF0aHMgdGhhdCBtYXkgY2F1c2UKPiA+ ID4gdW5ib3VuZGVkIGRlbGF5IGR1ZSB0byBhbm90aGVyIHByb2Nlc3MuIEd1YXJkaW5nIGFnYWlu c3QgZGVsYXkKPiA+ID4gaW5kdWNlZCBieSB0aGUgYWRtaW5pc3RyYXRvciBpcyBpbmZlYXNpYmxl LiBJdCBpcyBhbHdheXMgcG9zc2libGUgdG8KPiA+ID4ganVzdCBwYXVzZSB0aGUgbmljLiBOZXRl bSBpcyBvbmUgaW5zdGFuY2Ugb2YgdGhhdCwgYW5kIG5vdCB1bmJvdW5kZWQuCj4gPiAKPiA+IAo+ ID4gVGhlIHByb2JsZW0gaXMsIGFkbWluIG1heSBvbmx5IGRlbGF5IHRoZSB0cmFmZmljIGluIGUu ZyBvbmUgaW50ZXJmYWNlLCBidXQKPiA+IGl0IGFjdHVhbGx5IGRlbGF5IG9yIHN0YWxsIGFsbCB0 cmFmZmljIGluc2lkZSBhIFZNLgo+IAo+IFVuZGVyc3Rvb2QuIElkZWFsbHkgd2UgY2FuIHJlbW92 ZSB0aGUgSG9MIGJsb2NraW5nIGNhdXNlIG9mIHRoaXMsCj4gaXRzZWxmLgo+IAo+ID4gPiA+IE5l ZWQKPiA+ID4gPiB0byBjb25zaWRlciBhIGNvbXBsZXRlIHNvbHV0aW9uIGZvciB0aGlzLiBGaWd1 cmluZyBvdXQgYWxsIHBsYWNlcyB0aGF0Cj4gPiA+ID4gY291bGQKPiA+ID4gPiBkZWxheSBhIHBh Y2tldCBpcyBhIG1ldGhvZC4KPiA+ID4gCj4gPiA+IFRoZSBpc3N1ZSBkZXNjcmliZWQgaW4gdGhl IHJlZmVyZW5jZWQgcGF0Y2ggc2VlbXMgbGlrZSBoZWFkIG9mIGxpbmUKPiA+ID4gYmxvY2tpbmcg YmV0d2VlbiB0d28gZmxvd3MuIElmIG9uZSBmbG93IGRlbGF5cyB6ZXJvY29weSBkZXNjcmlwdG9y Cj4gPiA+IHJlbGVhc2UgZnJvbSB0aGUgdmhvc3QtbmV0IHBvb2wsIGl0IGJsb2NrcyBhbGwgc3Vi c2VxdWVudCBkZXNjcmlwdG9ycwo+ID4gPiBpbiB0aGF0IHBvb2wgZnJvbSBiZWluZyByZWxlYXNl ZCwgYWxzbyBkZWxheWluZyBvdGhlciBmbG93cyB0aGF0IHVzZQo+ID4gPiB0aGUgc2FtZSBkZXNj cmlwdG9yIHBvb2wuIElmIHRoZSBwb29sIGlzIGVtcHR5LCBhbGwgdHJhbnNtaXNzaW9uIHN0b3Bw ZWQuCj4gPiA+IAo+ID4gPiBSZXZlcnRpbmcgdG8gY29weSB0eCB3aGVuIHRoZSBwb29sIHJlYWNo ZXMgYSBsb3cgd2F0ZXJtYXJrLCBhcyB0aGUKPiA+ID4gcGF0Y2ggZG9lcywgZml4ZXMgdGhpcy4K PiA+IAo+ID4gCj4gPiBBbiBpc3N1ZSBvZiB0aGUgcmVmZXJlbmNlZCBwYXRjaCBpcyB0aGF0IHNu ZGJ1ZiBjb3VsZCBiZSBzbWFsbGVyIHRoYW4gbG93Cj4gPiB3YXRlcm1hcmsuCldlIGNhbm5vdCBk ZXRlcm1pbmUgdGhlIGxvdyB3YXRlcm1hcmsgcHJvcGVybHkgYmVjYXVzZSBvZiBub3Qgb25seSBz bmRidWYgc2l6ZQppc3N1ZSBidXQgYWxzbyB0aGUgZmFjdCB0aGF0IHRoZSB1cHBlciB2aG9zdC1u ZXQgY2Fubm90IGRpcmVjdGx5IHNlZSBob3cgbXVjaApkZXNjcmlwdG9yIGlzIGN1cnJlbnRseSBh dmFpbGFibGUgYXQgdGhlIHZpcnRpby1uZXQgdHggcXVldWUuIEl0IGRlcGVuZHMgb24KbXVsdGlx dWV1ZSBzZXR0aW5ncyBvciBvdGhlciBzZW5kZXJzIHdoaWNoIGFyZSBhbHNvIHVzaW5nIHRoZSBz YW1lIHR4IHF1ZXVlLgpOb3RlIHRoYXQgaW4gdGhlIGxhdHRlciBjYXNlIGlmIHRoZXkgY29uc3Rh bnRseSB0cmFuc21pdHRpbmcsIHRoZSBkZWFkbG9jayBjb3VsZApub3Qgb2NjdXIoKiksIGhvd2V2 ZXIgaWYgaXQgaGFzIGp1c3QgdGVtcG9yYXJpbHkgZnVsZmlsbCBzb21lIHBvcnRpb24gb2YgdGhl CnBvb2wgaW4gdGhlIG1lYW4gdGltZSwgdGhlbiB0aGUgbG93IHdhdGVybWFyayBjYW5ub3QgYmUg aGVscGZ1bC4KKCo6wqBUaGF0IGlzIGJlY2F1c2UgaXQncyByZWxpYWJsZSBlbm91Z2ggaW4gdGhl IHNlbnNlIEkgbWVudGlvbiBiZWxvdy4pCgpLZWVwIGluIHRoaXMgaW4gbWluZCwgbGV0IG1lIGJy aWVmbHkgZGVzY3JpYmUgdGhlIHBvc3NpYmxlIGRlYWRsb2NrIEkgbWVudGlvbmVkOgooMSkuIHZo b3N0LW5ldCBvbiBMMSBndWVzdCBoYXMgbm90aGluZyB0byBkbyBzZW5kbXNnIHVudGlsIHRoZSB1 cHBlciBsYXllciBzZXRzCm5ldyBkZXNjcmlwdG9ycywgd2hpY2ggZGVwZW5kcyBvbmx5IG9uIHRo ZSB2aG9zdC1uZXQgemNvcHkgY2FsbGJhY2sgYW5kIGFkZGluZwpuZXdseSB1c2VkIGRlc2NyaXB0 b3JzLgooMikuIHZob3N0LW5ldCBjYWxsYmFjayBkZXBlbmRzIG9uIHRoZSBza2IgZnJlZWluZyBv biB0aGUgeG1pdCBwYXRoIG9ubHkuCigzKS4gdGhlIHhtaXQgcGF0aCBkZXBlbmRzIChwb3NzaWJs eSBvbmx5KSBvbiB0aGUgdmhvc3QtbmV0IHNlbmRtc2cuCkFzIHlvdSBzZWUsIGl0J3MgZW5vdWdo IHRvIGJyaW5nIGFib3V0IHRoZSBzaXR1YXRpb24gYWJvdmUgdGhhdCBMMSB2aXJ0aW8tbmV0CnJl YWNoZXMgaXRzIGxpbWl0IGVhcmxpZXIgdGhhbiB0aGUgTDAgaG9zdCBwcm9jZXNzaW5nLiBUaGUg dmhvc3QtbmV0IHBvb2wgY291bGQKYmUgYWxtb3N0IGZ1bGwgb3IgZW1wdHksIHdoYXRldmVyLgoK QWxzbyBub3RlIHRoYXQgcmVsYXhpbmcgdGhlIHJlc3RyaWN0aW9uICgyKSAoYW5kIHRodXMgcmVt b3ZlIHRoZSBkZXBlbmRlbmN5ICgzKQotPiAoMSkpIHNlZW1zIHF1aXRlIG5hdHVyYWwgYnV0IGl0 IG5lZWRzIHRvIGJlIHJlbGlhYmxlIGVub3VnaCB0byBuZXZlciBtaXNzIHRoZQpsYXN0IHRyaWdn ZXIgaWYgaXQncyBiYXNlZCBvbiBpbnRlcnJ1cHRpb24uIFdlIG1pZ2h0IG5lZWQgdG8gZG8gc29t ZQptb2RpZmljYXRpb24gb24gdmlydGlvIGludGVycnVwdGlvbiBtaXRpZ2F0aW9uIGluIG5vbmUg dHggbmFwaSBjYXNlIGJ1dCBpdCdzIHRvbwpjb3N0bHkgYW5kIG5vdCBmYWlyIHRvIGNvdmVyIHRo ZSB1cHBlciBsYXllciBwZWN1bGlhcml0eS4KClNvIEkgdGhpbmsgZHJpdmVycyB3aGljaCBob2xk cyBjaGFyYWN0ZXJpc3RpY3Mgc3VjaCBhcyAoMikgaXMgd29ydGggY2hlY2tpbmcKd2hldGhlciB3 ZSBzaG91bGQgcmV2aXNlLgo+ID4gCj4gPiA+IFBlcmhhcHMgdGhlIGRlc2NyaXB0b3IgcG9vbCBz aG91bGQgYWxzbyBiZQo+ID4gPiByZXZpc2VkIHRvIGFsbG93IG91dCBvZiBvcmRlciBjb21wbGV0 aW9ucy4gVGhlbiB0aGVyZSBpcyBubyBuZWVkIHRvCj4gPiA+IGNvcHkgemVyb2NvcHkgcGFja2V0 cyB3aGVuZXZlciB0aGV5IG1heSBleHBlcmllbmNlIGRlbGF5Lgo+ID4gCj4gPiAKPiA+IFllcywg YnV0IGFzIHJlcGxpZWQgaW4gdGhlIHJlZmVyZW5jZWQgdGhyZWFkLCB3aW5kb3dzIGRyaXZlciBt YXkgdHJlYXQgb3V0Cj4gPiBvZiBvcmRlciBjb21wbGV0aW9uIGFzIGEgYnVnLgo+IAo+IEludGVy ZXN0aW5nLiBJIG1pc3NlZCB0aGF0LiBQZXJoYXBzIHRoZSB6ZXJvY29weSBvcHRpbWl6YXRpb24K PiBjb3VsZCBiZSBnYXRlZCBvbiBndWVzdCBzdXBwb3J0IGZvciBvdXQgb2Ygb3JkZXIgY29tcGxl dGlvbnMuCj4gCj4gPiA+IE9uIHRoZSBwb2ludCBvZiBjb3VudGluZyBjb3B5IHZzIHplcm9jb3B5 OiB0aGUgbmV3IG1zZ196ZXJvY29weQo+ID4gPiB2YXJpYW50IG9mIHVidWZfaW5mbyBoYXMgYSBm aWVsZCB0byByZWNvcmQgd2hldGhlciBhIGRlZXAgY29weSB3YXMKPiA+ID4gbWFkZS4gVGhpcyBj YW4gYmUgdXNlZCB3aXRoIHZob3N0LW5ldCB6ZXJvY29weSwgdG9vLgo+ID4gCj4gPiAKPiA+IEp1 c3QgdG8gbWFrZSBzdXJlIEkgdW5kZXJzdGFuZC4gSXQncyBzdGlsbCBub3QgY2xlYXIgdG8gbWUg aG93IHRvIHJldXNlIHRoaXMKPiA+IGZvciB2aG9zdC1uZXQsIGUuZyB6ZXJvY29weSBmbGFnIGlz IGluIGEgdW5pb24gd2hpY2ggaXMgbm90IHVzZWQgYnkKPiA+IHZob3N0X25ldC4KPiAKPiBUcnVl LCBidXQgdGhhdCBpcyBub3Qgc2V0IGluIHN0b25lLiBJIHdlbnQgYmFjayBhbmQgZm9ydGggb24g dGhhdCB3aGVuCj4gcHJlcGFyaW5nIGZpeCAwYTRhMDYwYmIyMDQgKCJzb2NrOiBmaXggemVyb2Nv cHlfc3VjY2VzcyByZWdyZXNzaW9uCj4gd2l0aCBtc2dfemVyb2NvcHkiKS4gVGhlIGZpZWxkIGNh biBiZSBtb3ZlZCBvdXRzaWRlIHRoZSB1bmlvbiBhbmQKPiBpbml0aWFsaXplZCBpbiB0aGUgb3Ro ZXIgemVyb2NvcHkgcGF0aHMuCgpfX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19f X19fX19fX19fXwpWaXJ0dWFsaXphdGlvbiBtYWlsaW5nIGxpc3QKVmlydHVhbGl6YXRpb25AbGlz dHMubGludXgtZm91bmRhdGlvbi5vcmcKaHR0cHM6Ly9saXN0cy5saW51eGZvdW5kYXRpb24ub3Jn L21haWxtYW4vbGlzdGluZm8vdmlydHVhbGl6YXRpb24=