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[67.170.74.237]) by smtp.gmail.com with ESMTPSA id 41be03b00d2f7-6822092f45fsm6652362a12.9.2024.05.28.10.42.58 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Tue, 28 May 2024 10:42:59 -0700 (PDT) From: dthaler1968@googlemail.com X-Google-Original-From: To: "'Andrii Nakryiko'" , "'Shankar Seal'" Cc: , References: In-Reply-To: Subject: RE: [Bpf] Re: Writing into a ring buffer map from user space Date: Tue, 28 May 2024 10:42:56 -0700 Message-ID: <0c4801dab126$7a502fc0$6ef08f40$@gmail.com> Precedence: bulk X-Mailing-List: bpf@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable X-Mailer: Microsoft Outlook 16.0 Thread-Index: AQHl5GiPScCT4J9LZ8tQH7TdFBakVgIm+6NAAnaUIquxcZcd0A== Content-Language: en-us Andrii Nakryiko wrote: > On Tue, May 28, 2024 at 9:32=E2=80=AFAM Shankar Seal > wrote: > > > > Adding bpf@vger.kernel.org > > > > A common use case of an BPF ring buffer map to use as a queue of > > events generated by BPF programs that can be read in-order by user > > space applications. I have a scenario requirement for a user space > > application to write into a ring buffer (or similar) map, such that > > events by BPF programs in kernel and user space applications are > > interleaved in the order they were generated, that can be consumed = by > > another user space application > > > > I would like to implement this new feature in the > https://github.com/microsoft/ebpf-for-windows project. But before I go = ahead with > the implementation, I wanted to check if there is any way to = accomplish this in > Linux today? If not, is there any reason why this should not be done? >=20 > Yes, there is. See user_ring_buffer ([0], [1]). >=20 > [0] > = https://github.com/torvalds/linux/blob/master/tools/testing/selftests/bpf= /prog_tests/ > user_ringbuf.c > [1] > = https://github.com/torvalds/linux/blob/master/tools/testing/selftests/bpf= /progs/user_ > ringbuf_success.c Both of those links go to GPL code so I suspect Shankar cannot use those = links. I think the answer is that BPF_MAP_TYPE_USER_RINGBUF is defined for this purpose and Shankar can read https://lwn.net/Articles/907056/ Thanks, Dave From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail.ietf.org (mail.ietf.org [50.223.129.194]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 8999947A6B for ; Tue, 28 May 2024 17:43:11 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=50.223.129.194 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1716918194; cv=none; b=k+u94j45q3wDyaTr6+QV6sgrtEGmHIhTGLYG1hAFN+oxabBT1+lnSksaqPfXJUMCdi1tONdZpFytAmZIXUsthUK0ETdyU7bf9ZJjz+3AVRTf0x/B8u7T8zS+DyNGHww7/LtbKovOyGAeewJXFnnSsJ7oSfxZBuMeOApZQ8j/8T4= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1716918194; c=relaxed/simple; bh=1cKP2d7d1Q21wjiD4c/MYO/ZyyIN6pIWX8DvDxIbJSw=; h=To:References:In-Reply-To:Date:Message-ID:MIME-Version:CC:Subject: Content-Type:From; 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[67.170.74.237]) by smtp.gmail.com with ESMTPSA id 41be03b00d2f7-6822092f45fsm6652362a12.9.2024.05.28.10.42.58 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Tue, 28 May 2024 10:42:59 -0700 (PDT) X-Google-Original-From: To: "'Andrii Nakryiko'" , "'Shankar Seal'" References: In-Reply-To: Date: Tue, 28 May 2024 10:42:56 -0700 Message-ID: <0c4801dab126$7a502fc0$6ef08f40$@gmail.com> Precedence: bulk X-Mailing-List: bpf@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Mailer: Microsoft Outlook 16.0 Thread-Index: AQHl5GiPScCT4J9LZ8tQH7TdFBakVgIm+6NAAnaUIquxcZcd0A== Content-Language: en-us Message-ID-Hash: H3GHK6OH4NRNG5V4RASKQULV5O6TLBEF X-Message-ID-Hash: H3GHK6OH4NRNG5V4RASKQULV5O6TLBEF X-MailFrom: dthaler1968@googlemail.com X-Mailman-Rule-Misses: dmarc-mitigation; no-senders; approved; emergency; loop; banned-address; member-moderation; nonmember-moderation; administrivia; implicit-dest; max-recipients; max-size; news-moderation; no-subject; digests; suspicious-header CC: bpf@ietf.org, bpf@vger.kernel.org X-Mailman-Version: 3.3.9rc4 Precedence: list Subject: =?utf-8?q?=5BBpf=5D_Re=3A_Writing_into_a_ring_buffer_map_from_user_space?= Archived-At: List-Archive: List-Help: List-Owner: List-Post: X-Mailman-Copy: yes Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 X-Original-From: dthaler1968@googlemail.com From: dthaler1968=40googlemail.com@dmarc.ietf.org Message-ID: <20240528174256.PUopE8NXr4diVqo31qbe0jkStfoBJB5xy8PexHAEqco@z> QW5kcmlpIE5ha3J5aWtvIDxhbmRyaWkubmFrcnlpa29AZ21haWwuY29tPiB3cm90ZToNCg0KPiBP biBUdWUsIE1heSAyOCwgMjAyNCBhdCA5OjMy4oCvQU0gU2hhbmthciBTZWFsDQo+IDxTaGFua2Fy LlNlYWw9NDBtaWNyb3NvZnQuY29tQGRtYXJjLmlldGYub3JnPiB3cm90ZToNCj4gPg0KPiA+IEFk ZGluZyBicGZAdmdlci5rZXJuZWwub3JnDQo+ID4NCj4gPiBBIGNvbW1vbiB1c2UgY2FzZSBvZiBh biBCUEYgcmluZyBidWZmZXIgbWFwIHRvIHVzZSBhcyBhIHF1ZXVlIG9mDQo+ID4gZXZlbnRzIGdl bmVyYXRlZCBieSBCUEYgcHJvZ3JhbXMgdGhhdCBjYW4gYmUgcmVhZCBpbi1vcmRlciBieSB1c2Vy DQo+ID4gc3BhY2UgYXBwbGljYXRpb25zLiBJIGhhdmUgYSBzY2VuYXJpbyByZXF1aXJlbWVudCBm b3IgYSB1c2VyIHNwYWNlDQo+ID4gYXBwbGljYXRpb24gdG8gd3JpdGUgaW50byBhIHJpbmcgYnVm ZmVyIChvciBzaW1pbGFyKSBtYXAsIHN1Y2ggdGhhdA0KPiA+IGV2ZW50cyBieSBCUEYgcHJvZ3Jh bXMgaW4ga2VybmVsIGFuZCB1c2VyIHNwYWNlIGFwcGxpY2F0aW9ucyBhcmUNCj4gPiBpbnRlcmxl YXZlZCBpbiB0aGUgb3JkZXIgdGhleSB3ZXJlIGdlbmVyYXRlZCwgdGhhdCBjYW4gYmUgY29uc3Vt ZWQgYnkNCj4gPiBhbm90aGVyIHVzZXIgc3BhY2UgYXBwbGljYXRpb24NCj4gPg0KPiA+IEkgd291 bGQgbGlrZSB0byBpbXBsZW1lbnQgdGhpcyBuZXcgZmVhdHVyZSBpbiB0aGUNCj4gaHR0cHM6Ly9n aXRodWIuY29tL21pY3Jvc29mdC9lYnBmLWZvci13aW5kb3dzIHByb2plY3QuIEJ1dCBiZWZvcmUg SSBnbyBhaGVhZCB3aXRoDQo+IHRoZSBpbXBsZW1lbnRhdGlvbiwgSSB3YW50ZWQgdG8gY2hlY2sg aWYgdGhlcmUgaXMgYW55IHdheSB0byBhY2NvbXBsaXNoIHRoaXMgaW4NCj4gTGludXggdG9kYXk/ IElmIG5vdCwgaXMgdGhlcmUgYW55IHJlYXNvbiB3aHkgdGhpcyBzaG91bGQgbm90IGJlIGRvbmU/ DQo+IA0KPiBZZXMsIHRoZXJlIGlzLiBTZWUgdXNlcl9yaW5nX2J1ZmZlciAoWzBdLCBbMV0pLg0K PiANCj4gICBbMF0NCj4gaHR0cHM6Ly9naXRodWIuY29tL3RvcnZhbGRzL2xpbnV4L2Jsb2IvbWFz dGVyL3Rvb2xzL3Rlc3Rpbmcvc2VsZnRlc3RzL2JwZi9wcm9nX3Rlc3RzLw0KPiB1c2VyX3Jpbmdi dWYuYw0KPiAgIFsxXQ0KPiBodHRwczovL2dpdGh1Yi5jb20vdG9ydmFsZHMvbGludXgvYmxvYi9t YXN0ZXIvdG9vbHMvdGVzdGluZy9zZWxmdGVzdHMvYnBmL3Byb2dzL3VzZXJfDQo+IHJpbmdidWZf c3VjY2Vzcy5jDQoNCkJvdGggb2YgdGhvc2UgbGlua3MgZ28gdG8gR1BMIGNvZGUgc28gSSBzdXNw ZWN0IFNoYW5rYXIgY2Fubm90IHVzZSB0aG9zZSBsaW5rcy4NCkkgdGhpbmsgdGhlIGFuc3dlciBp cyB0aGF0IEJQRl9NQVBfVFlQRV9VU0VSX1JJTkdCVUYgaXMgZGVmaW5lZCBmb3IgdGhpcw0KcHVy cG9zZSBhbmQgU2hhbmthciBjYW4gcmVhZCBodHRwczovL2x3bi5uZXQvQXJ0aWNsZXMvOTA3MDU2 Lw0KDQpUaGFua3MsDQpEYXZlDQoNCg0KDQotLSAKQnBmIG1haWxpbmcgbGlzdCAtLSBicGZAaWV0 Zi5vcmcKVG8gdW5zdWJzY3JpYmUgc2VuZCBhbiBlbWFpbCB0byBicGYtbGVhdmVAaWV0Zi5vcmcK