From: Vadim Lomovtsev <vlomovtsev@marvell.com>
To: "sgoutham@cavium.com" <sgoutham@cavium.com>,
"sunil.kovvuri@gmail.com" <sunil.kovvuri@gmail.com>,
"rric@kernel.org" <rric@kernel.org>,
"linux-arm-kernel@lists.infradead.org"
<linux-arm-kernel@lists.infradead.org>,
"netdev@vger.kernel.org" <netdev@vger.kernel.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"davem@davemloft.net" <davem@davemloft.net>
Cc: "dnelson@redhat.com" <dnelson@redhat.com>
Subject: Re: [PATCH v3 0/8] nic: thunderx: fix communication races between VF & PF
Date: Wed, 20 Feb 2019 11:19:24 +0000 [thread overview]
Message-ID: <20190220111923.GA9566@localhost.localdomain> (raw)
In-Reply-To: <20190220110225.9497-1-vlomovtsev@marvell.com>
sorry for occasionally reply to old thread.
On Wed, Feb 20, 2019 at 11:02:42AM +0000, Vadim Lomovtsev wrote:
> The ThunderX CN88XX NIC Virtual Function driver uses mailbox interface
> to communicate to physical function driver. Each of VF has it's own pair
> of mailbox registers to read from and write to. The mailbox registers
> has no protection from possible races, so it has to be implemented
> at software side.
>
> After long term testing by loop of 'ip link set <ifname> up/down'
> command it was found that there are two possible scenarios when
> race condition appears:
> 1. VF receives link change message from PF and VF send RX mode
> configuration message to PF in the same time from separate thread.
> 2. PF receives RX mode configuration from VF and in the same time,
> in separate thread PF detects link status change and sends appropriate
> message to particular VF.
>
> Both cases leads to mailbox data to be rewritten, NIC VF messaging control
> data to be updated incorrectly and communication sequence gets broken.
>
> This patch series is to address race condition with VF & PF communication.
>
> Changes:
> v1 -> v2
> - 0000: correct typo in cover letter subject: 'betwen' -> 'between';
> - move link state polling request task from pf to vf
> instead of cheking status of mailbox irq;
> v2 -> v3
> - 0003: change return type of nicvf_send_cfg_done() function
> from int to void;
> - 0007: update subject and remove unused variable 'netdev'
> from nicvf_link_status_check_task() function;
>
> Vadim Lomovtsev (8):
> net: thunderx: correct typo in macro name
> net: thunderx: replace global nicvf_rx_mode_wq work queue for all VFs
> to private for each of them.
> net: thunderx: make CFG_DONE message to run through generic send-ack
> sequence
> net: thunderx: add nicvf_send_msg_to_pf result check for
> set_rx_mode_task
> net: thunderx: rework xcast message structure to make it fit into 64
> bit
> net: thunderx: add mutex to protect mailbox from concurrent calls for
> same VF
> net: thunderx: add LINK_CHANGE message handler at nicpf
> net: thunderx: remove link change polling code and info from nicpf
>
> drivers/net/ethernet/cavium/thunder/nic.h | 14 +-
> .../net/ethernet/cavium/thunder/nic_main.c | 149 ++++++------------
> .../net/ethernet/cavium/thunder/nicvf_main.c | 130 ++++++++++-----
> .../net/ethernet/cavium/thunder/thunder_bgx.c | 2 +-
> .../net/ethernet/cavium/thunder/thunder_bgx.h | 2 +-
> 5 files changed, 144 insertions(+), 153 deletions(-)
>
> --
> 2.17.2
next prev parent reply other threads:[~2019-02-20 11:19 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-03-27 15:07 [PATCH 0/7] net: thunderx: implement DMAC filtering support Vadim Lomovtsev
2018-03-27 15:07 ` [PATCH 1/7] net: thunderx: move filter register related macro into proper place Vadim Lomovtsev
2018-03-27 15:07 ` [PATCH 2/7] net: thunderx: add MAC address filter tracking for LMAC Vadim Lomovtsev
2018-03-27 15:07 ` [PATCH 3/7] net: thunderx: add multicast filter management support Vadim Lomovtsev
2018-03-28 12:29 ` kbuild test robot
2018-03-27 15:07 ` [PATCH 4/7] net: thunderx: add new messages for handle ndo_set_rx_mode callback Vadim Lomovtsev
2018-03-27 15:07 ` [PATCH 5/7] net: thunderx: add XCAST messages handlers for PF Vadim Lomovtsev
2018-03-27 15:07 ` [PATCH 6/7] net: thunderx: add workqueue control structures for handle ndo_set_rx_mode request Vadim Lomovtsev
2018-03-27 15:07 ` [PATCH 7/7] net: thunderx: add ndo_set_rx_mode callback implementation for VF Vadim Lomovtsev
2018-03-27 17:28 ` [PATCH 0/7] net: thunderx: implement DMAC filtering support David Miller
2018-03-28 8:47 ` Vadim Lomovtsev
2018-03-30 11:59 ` [PATCH v2 " Vadim Lomovtsev
2018-03-30 11:59 ` [PATCH v2 1/7] net: thunderx: move filter register related macro into proper place Vadim Lomovtsev
2018-03-30 11:59 ` [PATCH v2 2/7] net: thunderx: add MAC address filter tracking for LMAC Vadim Lomovtsev
2018-03-30 11:59 ` [PATCH v2 3/7] net: thunderx: add multicast filter management support Vadim Lomovtsev
2018-03-30 11:59 ` [PATCH v2 4/7] net: thunderx: add new messages for handle ndo_set_rx_mode callback Vadim Lomovtsev
2018-03-30 11:59 ` [PATCH v2 5/7] net: thunderx: add XCAST messages handlers for PF Vadim Lomovtsev
2018-03-30 11:59 ` [PATCH v2 6/7] net: thunderx: add workqueue control structures for handle ndo_set_rx_mode request Vadim Lomovtsev
2018-03-30 11:59 ` [PATCH v2 7/7] net: thunderx: add ndo_set_rx_mode callback implementation for VF Vadim Lomovtsev
2018-04-01 2:07 ` [PATCH v2 0/7] net: thunderx: implement DMAC filtering support David Miller
2018-04-02 10:40 ` Vadim Lomovtsev
2019-02-20 11:02 ` [PATCH v3 0/8] nic: thunderx: fix communication races between VF & PF Vadim Lomovtsev
2019-02-20 11:02 ` [PATCH v3 1/8] net: thunderx: correct typo in macro name Vadim Lomovtsev
2019-02-20 11:02 ` [PATCH v3 2/8] net: thunderx: replace global nicvf_rx_mode_wq work queue for all VFs to private for each of them Vadim Lomovtsev
2019-02-20 11:02 ` [PATCH v3 3/8] net: thunderx: make CFG_DONE message to run through generic send-ack sequence Vadim Lomovtsev
2019-02-20 11:02 ` [PATCH v3 5/8] net: thunderx: rework xcast message structure to make it fit into 64 bit Vadim Lomovtsev
2019-02-20 11:02 ` [PATCH v3 6/8] net: thunderx: add mutex to protect mailbox from concurrent calls for same VF Vadim Lomovtsev
2019-02-20 11:02 ` [PATCH v3 4/8] net: thunderx: add nicvf_send_msg_to_pf result check for set_rx_mode_task Vadim Lomovtsev
2019-02-20 11:02 ` [PATCH v3 7/8] net: thunderx: move link state polling function to VF Vadim Lomovtsev
2019-02-20 11:02 ` [PATCH v3 8/8] net: thunderx: remove link change polling code and info from nicpf Vadim Lomovtsev
2019-02-20 11:19 ` Vadim Lomovtsev [this message]
2019-02-22 19:44 ` [PATCH v3 0/8] nic: thunderx: fix communication races between VF & PF David Miller
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