From: Yuanhan Liu <yuanhan.liu@linux.intel.com>
To: Qi Zhang <qi.z.zhang@intel.com>
Cc: Konstantin Ananyev <konstantin.ananyev@intel.com>,
dpdk stable <stable@dpdk.org>
Subject: [dpdk-stable] patch 'net/ixgbe: fix out of order Rx read' has been queued to stable release 16.07.2
Date: Wed, 2 Nov 2016 18:21:30 +0800 [thread overview]
Message-ID: <1478082097-16957-34-git-send-email-yuanhan.liu@linux.intel.com> (raw)
In-Reply-To: <1478082097-16957-1-git-send-email-yuanhan.liu@linux.intel.com>
Hi,
FYI, your patch has been queued to stable release 16.07.2
Note it hasn't been pushed to http://dpdk.org/browse/dpdk-stable
yet. It will be pushed if I get no objections before 11/06/16.
So please shout if anyone has objections.
Thanks.
--yliu
---
>From 92704c3dfb390939ca6b4831853062fa375938bd Mon Sep 17 00:00:00 2001
From: Qi Zhang <qi.z.zhang@intel.com>
Date: Tue, 18 Oct 2016 02:29:41 +0800
Subject: [PATCH] net/ixgbe: fix out of order Rx read
[ upstream commit bd85525efbf3ce382c12146ab89954e8bcdfd0be ]
In vPMD, when we load Rx desc with _mm_loadu_si128, the volatile
modifier will be cast away, allowing the compiler to reorder the
load instructions.
The Rx recv function's correctness is relying on these load
instructions following a strict sequence, reading the descriptors
in reverse order, so we add compiler barrier to prevent compiler
reorder.
Fixes: c95584dc2b18 ("ixgbe: new vectorized functions for Rx/Tx")
Signed-off-by: Qi Zhang <qi.z.zhang@intel.com>
Acked-by: Konstantin Ananyev <konstantin.ananyev@intel.com>
---
drivers/net/ixgbe/ixgbe_rxtx_vec_sse.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/drivers/net/ixgbe/ixgbe_rxtx_vec_sse.c b/drivers/net/ixgbe/ixgbe_rxtx_vec_sse.c
index 1c4fd7c..7fb155a 100644
--- a/drivers/net/ixgbe/ixgbe_rxtx_vec_sse.c
+++ b/drivers/net/ixgbe/ixgbe_rxtx_vec_sse.c
@@ -305,6 +305,7 @@ _recv_raw_pkts_vec(struct ixgbe_rx_queue *rxq, struct rte_mbuf **rx_pkts,
/* Read desc statuses backwards to avoid race condition */
/* A.1 load 4 pkts desc */
descs[3] = _mm_loadu_si128((__m128i *)(rxdp + 3));
+ rte_compiler_barrier();
/* B.2 copy 2 mbuf point into rx_pkts */
_mm_storeu_si128((__m128i *)&rx_pkts[pos], mbp1);
@@ -313,8 +314,10 @@ _recv_raw_pkts_vec(struct ixgbe_rx_queue *rxq, struct rte_mbuf **rx_pkts,
mbp2 = _mm_loadu_si128((__m128i *)&sw_ring[pos+2]);
descs[2] = _mm_loadu_si128((__m128i *)(rxdp + 2));
+ rte_compiler_barrier();
/* B.1 load 2 mbuf point */
descs[1] = _mm_loadu_si128((__m128i *)(rxdp + 1));
+ rte_compiler_barrier();
descs[0] = _mm_loadu_si128((__m128i *)(rxdp));
/* B.2 copy 2 mbuf point into rx_pkts */
--
1.9.0
next prev parent reply other threads:[~2016-11-02 10:21 UTC|newest]
Thread overview: 44+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-11-02 10:20 [dpdk-stable] patch 'examples/ipsec-secgw: check SP only when setup' " Yuanhan Liu
2016-11-02 10:20 ` [dpdk-stable] patch 'pdump: fix created directory permissions' " Yuanhan Liu
2016-11-02 10:20 ` [dpdk-stable] patch 'app/procinfo: free xstats memory upon failure' " Yuanhan Liu
2016-11-02 10:21 ` [dpdk-stable] patch 'examples/ip_pipeline: fix plugin loading' " Yuanhan Liu
2016-11-02 10:21 ` [dpdk-stable] patch 'examples/qos_sched: fix dequeue from ring' " Yuanhan Liu
2016-11-02 10:21 ` [dpdk-stable] patch 'app/test: fix hash multiwriter sequence' " Yuanhan Liu
2016-11-02 10:21 ` [dpdk-stable] patch 'app/testpmd: fix RSS hash key size' " Yuanhan Liu
2016-11-02 10:21 ` [dpdk-stable] patch 'app/testpmd: fix DCB configuration' " Yuanhan Liu
2016-11-02 10:21 ` [dpdk-stable] patch 'lpm: fix freeing unused sub-table on rule delete' " Yuanhan Liu
2016-11-02 10:21 ` [dpdk-stable] patch 'net/bonding: validate speed after link up' " Yuanhan Liu
2016-11-02 10:21 ` [dpdk-stable] patch 'net/thunderx: fix Tx checksum handling' " Yuanhan Liu
2016-11-02 10:21 ` [dpdk-stable] patch 'net/enic: fix flow director' " Yuanhan Liu
2016-11-02 10:21 ` [dpdk-stable] patch 'net/enic: fix crash with removed flow director filters' " Yuanhan Liu
2016-11-02 10:21 ` [dpdk-stable] patch 'net/bnx2x: fix maximum PF queues' " Yuanhan Liu
2016-11-02 10:21 ` [dpdk-stable] patch 'net/bnx2x: fix socket id for slowpath memory' " Yuanhan Liu
2016-11-02 10:21 ` [dpdk-stable] patch 'net/ena: improve safety of string handling' " Yuanhan Liu
2016-11-02 10:21 ` [dpdk-stable] patch 'net/bnxt: ensure entry length is unsigned' " Yuanhan Liu
2016-11-02 10:21 ` [dpdk-stable] patch 'net/i40e: do not use VSI before NULL check' " Yuanhan Liu
2016-11-02 10:21 ` [dpdk-stable] patch 'net/bnxt: fix bit shift size' " Yuanhan Liu
2016-11-02 10:21 ` [dpdk-stable] patch 'net/mlx5: fix Rx function selection' " Yuanhan Liu
2016-11-02 12:44 ` Nélio Laranjeiro
2016-11-02 10:21 ` [dpdk-stable] patch 'net/ring: fix ring device creation via devargs' " Yuanhan Liu
2016-11-02 10:21 ` [dpdk-stable] patch 'net/fm10k: fix Rx checksum flags' " Yuanhan Liu
2016-11-02 10:21 ` [dpdk-stable] patch 'examples/tep_term: fix L4 length' " Yuanhan Liu
2016-11-02 10:21 ` [dpdk-stable] patch 'examples/tep_term: fix packet length with multi-segments' " Yuanhan Liu
2016-11-02 10:21 ` [dpdk-stable] patch 'app/testpmd: fix PF/VF check of flow director' " Yuanhan Liu
2016-11-02 10:21 ` [dpdk-stable] patch 'mempool: fix search of maximum contiguous pages' " Yuanhan Liu
2016-11-02 10:21 ` [dpdk-stable] patch 'ethdev: prevent duplicate event callback' " Yuanhan Liu
2016-11-02 10:21 ` [dpdk-stable] patch 'net/bnx2x: fix build with icc' " Yuanhan Liu
2016-11-02 10:21 ` [dpdk-stable] patch 'net/mlx5: fix hash key size retrieval' " Yuanhan Liu
2016-11-02 12:45 ` Nélio Laranjeiro
2016-11-02 10:21 ` [dpdk-stable] patch 'net/ixgbe: fix flow director mask' " Yuanhan Liu
2016-11-02 10:21 ` [dpdk-stable] patch 'app/testpmd: " Yuanhan Liu
2016-11-02 10:21 ` [dpdk-stable] patch 'app/testpmd: fix flow director endianness' " Yuanhan Liu
2016-11-02 10:21 ` [dpdk-stable] patch 'net/enic: revert truncated packets counter fix' " Yuanhan Liu
2016-11-02 10:21 ` Yuanhan Liu [this message]
2016-11-02 10:21 ` [dpdk-stable] patch 'net/fm10k: fix out of order Rx read' " Yuanhan Liu
2016-11-02 10:21 ` [dpdk-stable] patch 'net/mlx5: fix link status report' " Yuanhan Liu
2016-11-02 10:21 ` [dpdk-stable] patch 'net/fm10k: fix VF Tx queue initialization' " Yuanhan Liu
[not found] ` <8E8F16D832DEA44EAC8E3A3C70D1E0C737AB8DBD@CRSMSX101.amr.corp.intel.com>
2016-12-06 1:44 ` Yuanhan Liu
2016-11-02 10:21 ` [dpdk-stable] patch 'net/qede/base: fix 32-bit build' " Yuanhan Liu
2016-11-02 10:21 ` [dpdk-stable] patch 'net/i40e: fix hash filter on X722' " Yuanhan Liu
2016-11-02 10:21 ` [dpdk-stable] patch 'net/i40e: fix Rx hang when disable LLDP' " Yuanhan Liu
2016-11-02 10:21 ` [dpdk-stable] patch 'vhost: fix Windows VM hang' " Yuanhan Liu
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