patches for DPDK stable branches
 help / color / mirror / Atom feed
* [dpdk-stable] [PATCH v4] net/tap: fix missing _SC_IOV_MAX
@ 2019-03-08 19:06 olegpoly123
  2019-03-08 19:13 ` Wiles, Keith
  2019-03-08 21:51 ` [dpdk-stable] [dpdk-dev] " Stephen Hemminger
  0 siblings, 2 replies; 3+ messages in thread
From: olegpoly123 @ 2019-03-08 19:06 UTC (permalink / raw)
  To: keith.wiles, thomas; +Cc: dev, olegpoly123, stable

If the value _SC_IOV_MAX is missing, sysconf returns -1.
In this case, iov_max is set to a default value of 1024.

Cc: stable@dpdk.org

Signed-off-by: Oleg Polyakov <olegp123@walla.co.il>
---
 drivers/net/tap/rte_eth_tap.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/drivers/net/tap/rte_eth_tap.c b/drivers/net/tap/rte_eth_tap.c
index 6f5109fca..2a7e6aa00 100644
--- a/drivers/net/tap/rte_eth_tap.c
+++ b/drivers/net/tap/rte_eth_tap.c
@@ -68,6 +68,8 @@
 /* IPC key for queue fds sync */
 #define TAP_MP_KEY "tap_mp_sync_queues"
 
+#define TAP_IOV_DEFAULT_MAX 1024
+
 static int tap_devices_count;
 static struct rte_vdev_driver pmd_tap_drv;
 static struct rte_vdev_driver pmd_tun_drv;
@@ -1326,6 +1328,12 @@ tap_rx_queue_setup(struct rte_eth_dev *dev,
 	struct rx_queue *rxq = &internals->rxq[rx_queue_id];
 	struct rte_mbuf **tmp = &rxq->pool;
 	long iov_max = sysconf(_SC_IOV_MAX);
+
+	if (iov_max <= 0) {
+		TAP_LOG(WARNING,
+			"_SC_IOV_MAX is not defined. Using %d as default\n", TAP_IOV_DEFAULT_MAX);
+		iov_max = TAP_IOV_DEFAULT_MAX;
+	}
 	uint16_t nb_desc = RTE_MIN(nb_rx_desc, iov_max - 1);
 	struct iovec (*iovecs)[nb_desc + 1];
 	int data_off = RTE_PKTMBUF_HEADROOM;
-- 
2.14.1

^ permalink raw reply	[flat|nested] 3+ messages in thread

end of thread, other threads:[~2019-03-09  0:50 UTC | newest]

Thread overview: 3+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2019-03-08 19:06 [dpdk-stable] [PATCH v4] net/tap: fix missing _SC_IOV_MAX olegpoly123
2019-03-08 19:13 ` Wiles, Keith
2019-03-08 21:51 ` [dpdk-stable] [dpdk-dev] " Stephen Hemminger

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).