From: Qi Zhang <qi.z.zhang@intel.com>
To: jingjing.wu@intel.com, helin.zhang@intel.com
Cc: dev@dpdk.org, Qi Zhang <qi.z.zhang@intel.com>
Subject: [dpdk-dev] [PATCH v2 0/3] net: fix out of order Rx read issue
Date: Tue, 18 Oct 2016 02:29:39 +0800 [thread overview]
Message-ID: <1476728982-39985-1-git-send-email-qi.z.zhang@intel.com> (raw)
In vPMD, when load Rx desc with _mm_loadu_si128,
volatile point will be cast into non-volatile point.
So GCC is allowed to reorder the load instructions,
while Rx read's correctness is reply on these load
instructions to follow a backward sequence strictly,
so we add compile barrier to prevent compiler reorder.
We already met this issue on i40e with GCC6 and we
fixed this on ixgbe and fm10k also.
v2:
- fix check-git-log.sh warning.
- add more detail commit message.
Qi Zhang (3):
net/i40e: fix out of order Rx read issue
net/ixgbe: fix out of order Rx read issue
net/fm10k: fix out of ofder Rx read issue
drivers/net/fm10k/fm10k_rxtx_vec.c | 3 +++
drivers/net/i40e/i40e_rxtx_vec.c | 3 +++
drivers/net/ixgbe/ixgbe_rxtx_vec_sse.c | 3 +++
3 files changed, 9 insertions(+)
--
2.7.4
next reply other threads:[~2016-10-18 1:32 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-10-17 18:29 Qi Zhang [this message]
2016-10-17 18:29 ` [dpdk-dev] [PATCH v2 1/3] net/i40e: " Qi Zhang
2016-10-17 18:29 ` [dpdk-dev] [PATCH v2 2/3] net/ixgbe: " Qi Zhang
2016-10-17 18:29 ` [dpdk-dev] [PATCH v2 3/3] net/fm10k: fix out of ofder " Qi Zhang
2016-10-18 11:33 ` [dpdk-dev] [PATCH v2 0/3] net: fix out of order " Ananyev, Konstantin
2016-10-19 9:52 ` Bruce Richardson
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