From: Marcin Smoczynski Date: Mon, 23 Sep 2019 13:22:47 +0000 (+0200) Subject: net/tap: fix blocked Rx packets X-Git-Url: http://git.droids-corp.org/?a=commitdiff_plain;h=d070c3413164e3f8f7fa4c4325d7df50a8275f39;p=dpdk.git net/tap: fix blocked Rx packets When OS sends more packets than are being read with a single 'rte_eth_rx_burst' call, rx packets are getting stucked in the tap pmd and are unable to receive, because trigger_seen is getting updated and consecutive calls are not getting any packets. Do not update trigger_seen unless less than a max number of packets were received allowing next call to receive the rest. Remove unnecessary compiler barrier. Fixes: a0d8e807d9de ("net/tap: add Rx trigger") Cc: stable@dpdk.org Signed-off-by: Marcin Smoczynski Tested-by: Mariusz Drost Tested-by: Konstantin Ananyev Reviewed-by: Keith Wiles --- diff --git a/drivers/net/tap/rte_eth_tap.c b/drivers/net/tap/rte_eth_tap.c index 922371c295..a13d8d50d7 100644 --- a/drivers/net/tap/rte_eth_tap.c +++ b/drivers/net/tap/rte_eth_tap.c @@ -353,10 +353,8 @@ pmd_rx_burst(void *queue, struct rte_mbuf **bufs, uint16_t nb_pkts) if (trigger == rxq->trigger_seen) return 0; - if (trigger) - rxq->trigger_seen = trigger; + process_private = rte_eth_devices[rxq->in_port].process_private; - rte_compiler_barrier(); for (num_rx = 0; num_rx < nb_pkts; ) { struct rte_mbuf *mbuf = rxq->pool; struct rte_mbuf *seg = NULL; @@ -433,6 +431,9 @@ end: rxq->stats.ipackets += num_rx; rxq->stats.ibytes += num_rx_bytes; + if (trigger && num_rx < nb_pkts) + rxq->trigger_seen = trigger; + return num_rx; }