[dpdk-dev] Added Spinlock to l3fwd-vf example to prevent race conditioning
Neil Horman
nhorman at tuxdriver.com
Mon Dec 8 15:45:45 CET 2014
On Tue, Jul 08, 2014 at 12:16:24PM +0100, Daniel Mrzyglod wrote:
> Signed-off-by: Daniel Mrzyglod <danielx.t.mrzyglod at intel.com>
>
> ---
> examples/l3fwd-vf/main.c | 6 +++++-
> 1 file changed, 5 insertions(+), 1 deletion(-)
>
> diff --git a/examples/l3fwd-vf/main.c b/examples/l3fwd-vf/main.c
> index 2ca5c21..57852d0 100644
> --- a/examples/l3fwd-vf/main.c
> +++ b/examples/l3fwd-vf/main.c
> @@ -54,6 +54,7 @@
> #include <rte_per_lcore.h>
> #include <rte_launch.h>
> #include <rte_atomic.h>
> +#include <rte_spinlock.h>
> #include <rte_cycles.h>
> #include <rte_prefetch.h>
> #include <rte_lcore.h>
> @@ -328,7 +329,7 @@ struct lcore_conf {
> } __rte_cache_aligned;
>
> static struct lcore_conf lcore_conf[RTE_MAX_LCORE];
> -
> +static rte_spinlock_t spinlock_conf[RTE_MAX_ETHPORTS]={RTE_SPINLOCK_INITIALIZER};
> /* Send burst of packets on an output interface */
> static inline int
> send_burst(struct lcore_conf *qconf, uint16_t n, uint8_t port)
> @@ -340,7 +341,10 @@ send_burst(struct lcore_conf *qconf, uint16_t n, uint8_t port)
> queueid = qconf->tx_queue_id;
> m_table = (struct rte_mbuf **)qconf->tx_mbufs[port].m_table;
>
> + rte_spinlock_lock(&spinlock_conf[port]) ;
> ret = rte_eth_tx_burst(port, queueid, m_table, n);
> + rte_spinlock_unlock(&spinlock_conf[port]);
> +
> if (unlikely(ret < n)) {
> do {
> rte_pktmbuf_free(m_table[ret]);
Acked-by: Neil Horman <nhorman at tuxdriver.com>
Though, that said, doesn't it seem to anyone else like serialization of enqueue
to a port should be the responsibility of the library, not the application?
Neil
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