netdev - [PATCH 0/2] D_CAN RX buffer size improvements

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Date:   Fri, 8 Feb 2019 13:31:00 +0000
From:   Andrejs Cainikovs <Andrejs.Cainikovs@...module.com>
To:     Wolfgang Grandegger <wg@...ndegger.com>,
        Marc Kleine-Budde <mkl@...gutronix.de>,
        "David S . Miller" <davem@...emloft.net>,
        "linux-can@...r.kernel.org" <linux-can@...r.kernel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC:     Patrick Zysset <Patrick.Zysset@...module.com>
Subject: [PATCH 0/2] D_CAN RX buffer size improvements

Re-sending entire patchset due to missed cover letter, sorry.

This patchset introduces support for 64 D_CAN message objects with an option of
unequal split between RX/TX.

The rationale behind this is that there are lots of frame loss on higher bus
speeds. Below are test results from my custom Sitara AM3352 based board:

  Sender: timeout 15m cangen can0 -g 0 -i x
  Target: candump can0,0~0,#FFFFFFFF -td -c -d -e

  * Without patches:
    - 15 minute RX test, 500kbps
    - 16 RX / 16 TX message objects
    - 77 received frames lost out of 4649415

  * With patches applied:
    - 15 hours RX test, 500kbps
    - 56 RX / 8 TX message objects
    - 41 received frames lost out of 279303376

Please note, I do not have ability to test pure C_CAN, so it is left untested.

---

Andrejs Cainikovs (2):
  can: c_can: support 64 message objects for D_CAN
  can: c_can: configurable amount of D_CAN RX objects

 drivers/net/can/c_can/Kconfig | 20 ++++++++++
 drivers/net/can/c_can/c_can.c | 93 +++++++++++++++++++++++++++----------------
 drivers/net/can/c_can/c_can.h | 20 +++++++---
 3 files changed, 94 insertions(+), 39 deletions(-)

---
2.11.0