From mboxrd@z Thu Jan  1 00:00:00 1970
From: "Samudrala, Sridhar" <sridhar.samudrala@intel.com>
Subject: Re: [RFC PATCH net-next v2 2/2] virtio_net: Extend virtio to use VF
	datapath when available
Date: Fri, 26 Jan 2018 10:15:13 -0800
Message-ID: <dcebb89c-dff9-c499-a5ff-39aee79ce985@intel.com>
References: <1515736720-39368-1-git-send-email-sridhar.samudrala@intel.com>
	<1515736720-39368-3-git-send-email-sridhar.samudrala@intel.com>
	<20180126185617-mutt-send-email-mst@kernel.org>
Mime-Version: 1.0
Content-Type: text/plain; charset="utf-8"; Format="flowed"
Content-Transfer-Encoding: base64
Cc: alexander.h.duyck@intel.com, virtio-dev@lists.oasis-open.org,
	kubakici@wp.pl, netdev@vger.kernel.org,
	virtualization@lists.linux-foundation.org, davem@davemloft.net
To: "Michael S. Tsirkin" <mst@redhat.com>
Return-path: <virtualization-bounces@lists.linux-foundation.org>
In-Reply-To: <20180126185617-mutt-send-email-mst@kernel.org>
Content-Language: en-US
List-Unsubscribe: <https://lists.linuxfoundation.org/mailman/options/virtualization>,
	<mailto:virtualization-request@lists.linux-foundation.org?subject=unsubscribe>
List-Archive: <http://lists.linuxfoundation.org/pipermail/virtualization/>
List-Post: <mailto:virtualization@lists.linux-foundation.org>
List-Help: <mailto:virtualization-request@lists.linux-foundation.org?subject=help>
List-Subscribe: <https://lists.linuxfoundation.org/mailman/listinfo/virtualization>,
	<mailto:virtualization-request@lists.linux-foundation.org?subject=subscribe>
Sender: virtualization-bounces@lists.linux-foundation.org
Errors-To: virtualization-bounces@lists.linux-foundation.org
List-Id: netdev.vger.kernel.org

CgpPbiAxLzI2LzIwMTggODo1OCBBTSwgTWljaGFlbCBTLiBUc2lya2luIHdyb3RlOgo+IE9uIFRo
dSwgSmFuIDExLCAyMDE4IGF0IDA5OjU4OjM5UE0gLTA4MDAsIFNyaWRoYXIgU2FtdWRyYWxhIHdy
b3RlOgo+PiBAQCAtMjg1OSw2ICszMTIzLDQyIEBAIHN0YXRpYyBzdHJ1Y3QgdmlydGlvX2RyaXZl
ciB2aXJ0aW9fbmV0X2RyaXZlciA9IHsKPj4gICAjZW5kaWYKPj4gICB9Owo+PiAgIAo+PiArc3Rh
dGljIGludCB2aXJ0aW9fbmV0ZGV2X2V2ZW50KHN0cnVjdCBub3RpZmllcl9ibG9jayAqdGhpcywK
Pj4gKwkJCSAgICAgICB1bnNpZ25lZCBsb25nIGV2ZW50LCB2b2lkICpwdHIpCj4+ICt7Cj4+ICsJ
c3RydWN0IG5ldF9kZXZpY2UgKmV2ZW50X2RldiA9IG5ldGRldl9ub3RpZmllcl9pbmZvX3RvX2Rl
dihwdHIpOwo+PiArCj4+ICsJLyogU2tpcCBvdXIgb3duIGV2ZW50cyAqLwo+PiArCWlmIChldmVu
dF9kZXYtPm5ldGRldl9vcHMgPT0gJnZpcnRuZXRfbmV0ZGV2KQo+PiArCQlyZXR1cm4gTk9USUZZ
X0RPTkU7Cj4+ICsKPj4gKwkvKiBBdm9pZCBub24tRXRoZXJuZXQgdHlwZSBkZXZpY2VzICovCj4+
ICsJaWYgKGV2ZW50X2Rldi0+dHlwZSAhPSBBUlBIUkRfRVRIRVIpCj4+ICsJCXJldHVybiBOT1RJ
RllfRE9ORTsKPj4gKwo+PiArCS8qIEF2b2lkIFZsYW4gZGV2IHdpdGggc2FtZSBNQUMgcmVnaXN0
ZXJpbmcgYXMgVkYgKi8KPj4gKwlpZiAoaXNfdmxhbl9kZXYoZXZlbnRfZGV2KSkKPj4gKwkJcmV0
dXJuIE5PVElGWV9ET05FOwo+PiArCj4+ICsJLyogQXZvaWQgQm9uZGluZyBtYXN0ZXIgZGV2IHdp
dGggc2FtZSBNQUMgcmVnaXN0ZXJpbmcgYXMgVkYgKi8KPj4gKwlpZiAoKGV2ZW50X2Rldi0+cHJp
dl9mbGFncyAmIElGRl9CT05ESU5HKSAmJgo+PiArCSAgICAoZXZlbnRfZGV2LT5mbGFncyAmIElG
Rl9NQVNURVIpKQo+PiArCQlyZXR1cm4gTk9USUZZX0RPTkU7Cj4+ICsKPj4gKwlzd2l0Y2ggKGV2
ZW50KSB7Cj4+ICsJY2FzZSBORVRERVZfUkVHSVNURVI6Cj4+ICsJCXJldHVybiB2aXJ0bmV0X3Jl
Z2lzdGVyX3ZmKGV2ZW50X2Rldik7Cj4+ICsJY2FzZSBORVRERVZfVU5SRUdJU1RFUjoKPj4gKwkJ
cmV0dXJuIHZpcnRuZXRfdW5yZWdpc3Rlcl92ZihldmVudF9kZXYpOwo+PiArCWRlZmF1bHQ6Cj4+
ICsJCXJldHVybiBOT1RJRllfRE9ORTsKPj4gKwl9Cj4+ICt9Cj4+ICsKPj4gK3N0YXRpYyBzdHJ1
Y3Qgbm90aWZpZXJfYmxvY2sgdmlydGlvX25ldGRldl9ub3RpZmllciA9IHsKPj4gKwkubm90aWZp
ZXJfY2FsbCA9IHZpcnRpb19uZXRkZXZfZXZlbnQsCj4+ICt9Owo+PiArCj4+ICAgc3RhdGljIF9f
aW5pdCBpbnQgdmlydGlvX25ldF9kcml2ZXJfaW5pdCh2b2lkKQo+PiAgIHsKPj4gICAJaW50IHJl
dDsKPj4gQEAgLTI4NzcsNiArMzE3Nyw4IEBAIHN0YXRpYyBfX2luaXQgaW50IHZpcnRpb19uZXRf
ZHJpdmVyX2luaXQodm9pZCkKPj4gICAgICAgICAgIHJldCA9IHJlZ2lzdGVyX3ZpcnRpb19kcml2
ZXIoJnZpcnRpb19uZXRfZHJpdmVyKTsKPj4gICAJaWYgKHJldCkKPj4gICAJCWdvdG8gZXJyX3Zp
cnRpbzsKPj4gKwo+PiArCXJlZ2lzdGVyX25ldGRldmljZV9ub3RpZmllcigmdmlydGlvX25ldGRl
dl9ub3RpZmllcik7Cj4+ICAgCXJldHVybiAwOwo+PiAgIGVycl92aXJ0aW86Cj4+ICAgCWNwdWhw
X3JlbW92ZV9tdWx0aV9zdGF0ZShDUFVIUF9WSVJUX05FVF9ERUFEKTsKPj4gQEAgLTI4ODksNiAr
MzE5MSw3IEBAIG1vZHVsZV9pbml0KHZpcnRpb19uZXRfZHJpdmVyX2luaXQpOwo+PiAgIAo+PiAg
IHN0YXRpYyBfX2V4aXQgdm9pZCB2aXJ0aW9fbmV0X2RyaXZlcl9leGl0KHZvaWQpCj4+ICAgewo+
PiArCXVucmVnaXN0ZXJfbmV0ZGV2aWNlX25vdGlmaWVyKCZ2aXJ0aW9fbmV0ZGV2X25vdGlmaWVy
KTsKPj4gICAJdW5yZWdpc3Rlcl92aXJ0aW9fZHJpdmVyKCZ2aXJ0aW9fbmV0X2RyaXZlcik7Cj4+
ICAgCWNwdWhwX3JlbW92ZV9tdWx0aV9zdGF0ZShDUFVIUF9WSVJUX05FVF9ERUFEKTsKPj4gICAJ
Y3B1aHBfcmVtb3ZlX211bHRpX3N0YXRlKHZpcnRpb25ldF9vbmxpbmUpOwo+IEkgaGF2ZSBhIHF1
ZXN0aW9uIGhlcmU6IHdoYXQgaWYgUFQgZGV2aWNlIGRyaXZlciBtb2R1bGUgbG9hZHMKPiBhbmQg
Y3JlYXRlcyBhIGRldmljZSBiZWZvcmUgdmlydGlvPwo+Cj4KSW5pdGlhbGx5IGkgYWxzbyBoYWQg
dGhpcyBxdWVzdGlvbiBpZiB3ZSBnZXQgTkVUREVWX1JFR0lTVEVSIGV2ZW50cyBmb3IgCm5ldGRl
dnMKdGhhdCBhcmUgYWxyZWFkeSBwcmVzZW50LiBCdXQgaXQgbG9va3MgbGlrZSAKcmVnaXN0ZXJf
bmV0ZGV2aWNlX25vdGlmaWVyKCkgd2lsbCBjYXVzZQpyZXBsYXkgb2YgYWxsIHRoZSByZWdpc3Ry
YXRpb24gYW5kIHVwIGV2ZW50cyBvZiBleGlzdGluZyBkZXZpY2VzLgoKLyoqCiDCoCogcmVnaXN0
ZXJfbmV0ZGV2aWNlX25vdGlmaWVyIC0gcmVnaXN0ZXIgYSBuZXR3b3JrIG5vdGlmaWVyIGJsb2Nr
CiDCoCogQG5iOiBub3RpZmllcgogwqAqCiDCoCogUmVnaXN0ZXIgYSBub3RpZmllciB0byBiZSBj
YWxsZWQgd2hlbiBuZXR3b3JrIGRldmljZSBldmVudHMgb2NjdXIuCiDCoCogVGhlIG5vdGlmaWVy
IHBhc3NlZCBpcyBsaW5rZWQgaW50byB0aGUga2VybmVsIHN0cnVjdHVyZXMgYW5kIG11c3QKIMKg
KiBub3QgYmUgcmV1c2VkIHVudGlsIGl0IGhhcyBiZWVuIHVucmVnaXN0ZXJlZC4gQSBuZWdhdGl2
ZSBlcnJubyBjb2RlCiDCoCogaXMgcmV0dXJuZWQgb24gYSBmYWlsdXJlLgogwqAqCiDCoCogV2hl
biByZWdpc3RlcmVkIGFsbCByZWdpc3RyYXRpb24gYW5kIHVwIGV2ZW50cyBhcmUgcmVwbGF5ZWQK
IMKgKiB0byB0aGUgbmV3IG5vdGlmaWVyIHRvIGFsbG93IGRldmljZSB0byBoYXZlIGEgcmFjZSBm
cmVlCiDCoCogdmlldyBvZiB0aGUgbmV0d29yayBkZXZpY2UgbGlzdC4KIMKgKi8KClRoYW5rcwpT
cmlkaGFyCl9fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fClZp
cnR1YWxpemF0aW9uIG1haWxpbmcgbGlzdApWaXJ0dWFsaXphdGlvbkBsaXN0cy5saW51eC1mb3Vu
ZGF0aW9uLm9yZwpodHRwczovL2xpc3RzLmxpbnV4Zm91bmRhdGlvbi5vcmcvbWFpbG1hbi9saXN0
aW5mby92aXJ0dWFsaXphdGlvbg==