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authorTianyu Li <tianyu.li@arm.com>2021-08-26 10:03:43 +0800
committerFlorin Coras <florin.coras@gmail.com>2021-08-30 18:53:14 +0000
commit40ba69271b27beca78eb8e4dbc5b13c05100299a (patch)
treec45233560427e64cbff14059631771ec004eaa50 /src/vnet/session
parent276675e2a3907cf38ac097a070fada82be1c2d5a (diff)
session: fix prefetch out of struct bound on Arm
CLIB_PREFETCH (s->tx_fifo, 2 * CLIB_CACHE_LINE_BYTES, LOAD); sizeof(svm_fifo_t) is 128 bytes Note on 64B cacheline size Arm machine, CLIB_CACHE_LINE_BYTES 128 CLIB_CACHE_PREFETCH_BYTES 6 above CLIB_PREFETCH () macro will be expand to __builtin_prefetch(s->tx_fifo) __builtin_prefetch(s->tx_fifo + 64) __builtin_prefetch(s->tx_fifo + 128) << prefetch out of range __builtin_prefetch(s->tx_fifo + 192) << the same here Solution: Change to CLIB_PREFETCH (s->tx_fifo, sizeof (*(s->tx_fifo)), LOAD); Type: fix Signed-off-by: Tianyu Li <tianyu.li@arm.com> Reviewed-by: Lijian Zhang <lijian.zhang@arm.com> Change-Id: I745cbce3dbe5afcab53c39189d18392f569df5aa
Diffstat (limited to 'src/vnet/session')
-rw-r--r--src/vnet/session/session_node.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/vnet/session/session_node.c b/src/vnet/session/session_node.c
index 969f88c7e36..18fb61d25e9 100644
--- a/src/vnet/session/session_node.c
+++ b/src/vnet/session/session_node.c
@@ -1580,7 +1580,7 @@ session_event_dispatch_io (session_worker_t * wrk, vlib_node_runtime_t * node,
s = session_event_get_session (wrk, e);
if (PREDICT_FALSE (!s))
break;
- CLIB_PREFETCH (s->tx_fifo, 2 * CLIB_CACHE_LINE_BYTES, LOAD);
+ CLIB_PREFETCH (s->tx_fifo, sizeof (*(s->tx_fifo)), LOAD);
wrk->ctx.s = s;
/* Spray packets in per session type frames, since they go to
* different nodes */