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From: "Ananyev, Konstantin" <konstantin.ananyev@intel.com>
To: ZY Qiu <quzeyao@gmail.com>, Thomas Monjalon <thomas@monjalon.net>,
	"Yigit, Ferruh" <ferruh.yigit@intel.com>,
	Andrew Rybchenko <arybchenko@solarflare.com>
Cc: "dev@dpdk.org" <dev@dpdk.org>,
	"stephen@networkplumber.org" <stephen@networkplumber.org>,
	ZY Qiu <tgw_team@tencent.com>
Subject: Re: [dpdk-dev] [PATCH v3] rte_ethdev: safer memory access by calling Rx/Tx callback
Date: Wed, 11 Mar 2020 12:22:41 +0000
Message-ID: <SN6PR11MB25581A1A6B117CEB14684E879AFC0@SN6PR11MB2558.namprd11.prod.outlook.com> (raw)
In-Reply-To: <20200305164704.29900-1-tgw_team@tencent.com>



> -----Original Message-----
> From: ZY Qiu <quzeyao@gmail.com>
> Sent: Thursday, March 5, 2020 4:47 PM
> To: Thomas Monjalon <thomas@monjalon.net>; Yigit, Ferruh <ferruh.yigit@intel.com>; Andrew Rybchenko <arybchenko@solarflare.com>
> Cc: dev@dpdk.org; stephen@networkplumber.org; Ananyev, Konstantin <konstantin.ananyev@intel.com>; ZY Qiu
> <tgw_team@tencent.com>
> Subject: [PATCH v3] rte_ethdev: safer memory access by calling Rx/Tx callback
> 
> When compiling with -O0,
> the compiler does not optimize two memory accesses into one.
> Leads to accessing a null pointer when queue post Rx burst callback
> removal while traffic is running.
> 
> Signed-off-by: ZY Qiu <tgw_team@tencent.com>
> ---
>  lib/librte_ethdev/rte_ethdev.h | 9 +++++----
>  1 file changed, 5 insertions(+), 4 deletions(-)
> 
> diff --git a/lib/librte_ethdev/rte_ethdev.h b/lib/librte_ethdev/rte_ethdev.h
> index d1a593ad1..c46612e3e 100644
> --- a/lib/librte_ethdev/rte_ethdev.h
> +++ b/lib/librte_ethdev/rte_ethdev.h
> @@ -4388,10 +4388,10 @@ rte_eth_rx_burst(uint16_t port_id, uint16_t queue_id,
>  				     rx_pkts, nb_pkts);
> 
>  #ifdef RTE_ETHDEV_RXTX_CALLBACKS
> -	if (unlikely(dev->post_rx_burst_cbs[queue_id] != NULL)) {
> -		struct rte_eth_rxtx_callback *cb =
> -				dev->post_rx_burst_cbs[queue_id];
> +	struct rte_eth_rxtx_callback *volatile cb =
> +			dev->post_rx_burst_cbs[queue_id];
> 
> +	if (unlikely(cb != NULL)) {
>  		do {
>  			nb_rx = cb->fn.rx(port_id, queue_id, rx_pkts, nb_rx,
>  						nb_pkts, cb->param);
> @@ -4652,7 +4652,8 @@ rte_eth_tx_burst(uint16_t port_id, uint16_t queue_id,
>  #endif
> 
>  #ifdef RTE_ETHDEV_RXTX_CALLBACKS
> -	struct rte_eth_rxtx_callback *cb = dev->pre_tx_burst_cbs[queue_id];
> +	struct rte_eth_rxtx_callback *volatile cb =
> +			dev->pre_tx_burst_cbs[queue_id];
> 
>  	if (unlikely(cb != NULL)) {
>  		do {
> --

Acked-by: Konstantin Ananyev <konstantin.ananyev@intel.com>

> 2.17.1


  parent reply	other threads:[~2020-03-11 12:22 UTC|newest]

Thread overview: 21+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-03-04 14:05 [dpdk-dev] [PATCH] rte_ethdev: fix unsafe memory access by calling RX callback Tencent TGW team
2020-03-04 14:16 ` Andrew Rybchenko
     [not found]   ` <61a6b7d5533643d692c40dc0ab1a2cdc@tencent.com>
2020-03-04 16:26     ` tgw_team(腾讯网关团队)
2020-03-04 16:15 ` Stephen Hemminger
2020-03-04 16:38   ` [dpdk-dev] [PATCH] rte_ethdev: fix unsafe memory access by calling RX callback.(Internet mail) tgw_team(腾讯网关团队)
2020-03-04 17:37     ` Stephen Hemminger
2020-03-04 17:44       ` [dpdk-dev] [PATCH] rte_ethdev: fix unsafe memory access by calling RX callback tgw_team(腾讯网关团队)
2020-03-04 17:33 ` [dpdk-dev] [PATCH v2] rte_ethdev: safer memory access by calling Rx callback ZY Qiu
2020-03-04 17:56   ` Stephen Hemminger
2020-03-04 18:31     ` tgw_team(腾讯网关团队)
2020-03-05  9:19   ` Bruce Richardson
2020-03-05 11:27     ` Ananyev, Konstantin
2020-03-05 14:23       ` tgw_team(腾讯网关团队)
2020-03-05 14:47       ` Liang, Ma
2020-03-05 15:19         ` Ananyev, Konstantin
2020-03-05 15:42           ` Liang, Ma
2020-03-05 16:47   ` [dpdk-dev] [PATCH v3] rte_ethdev: safer memory access by calling Rx/Tx callback ZY Qiu
2020-03-05 17:23     ` Jerin Jacob
2020-03-11 12:22     ` Ananyev, Konstantin [this message]
2020-03-11 12:26       ` Jerin Jacob
2020-10-01 15:14         ` Ferruh Yigit

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