[dpdk-dev] [PATCH] app/testpmd: fix segment number check

[Viacheslav Ovsiienko <viacheslavo@nvidia.com>]

The --txpkts command line parameter was silently ignored due to
application was unable to check the Tx queue ring sizes for non
configured ports [1].

The "set txpkts <len0[,len1]*>" was also rejected if there
was some stopped or /unconfigured port.

This provides the following:

  - number of segment check is performed against
    configured Tx queues only

  - the capability to send single packet is supposed to
    be very basic and always supported, the setting segment
    number to 1 is always allowed, no check performed

  - at the moment of Tx queue setup the descriptor number is
    checked against configured segment number

Fixes: 8dae835d88b7 ("app/testpmd: remove restriction on Tx segments set")
Cc: stable@dpdk.org
Bugzilla ID: 584

Signed-off-by: Viacheslav Ovsiienko <viacheslavo@nvidia.com>
---
 app/test-pmd/cmdline.c |  5 +++++
 app/test-pmd/config.c  | 21 ++++++++++++++++-----
 app/test-pmd/testpmd.c |  7 ++++++-
 3 files changed, 27 insertions(+), 6 deletions(-)

diff --git a/app/test-pmd/cmdline.c b/app/test-pmd/cmdline.c
index 0d2d6aa..86388a2 100644
--- a/app/test-pmd/cmdline.c
+++ b/app/test-pmd/cmdline.c
@@ -2798,6 +2798,11 @@ struct cmd_setup_rxtx_queue {
 		if (!numa_support || socket_id == NUMA_NO_CONFIG)
 			socket_id = port->socket_id;
 
+		if (port->nb_tx_desc[res->qid] < tx_pkt_nb_segs) {
+			printf("Failed to setup TX queue: "
+			       "not enough descriptors\n");
+			return;
+		}
 		ret = rte_eth_tx_queue_setup(res->portid,
 					     res->qid,
 					     port->nb_tx_desc[res->qid],
diff --git a/app/test-pmd/config.c b/app/test-pmd/config.c
index b51de59..a6fccfa 100644
--- a/app/test-pmd/config.c
+++ b/app/test-pmd/config.c
@@ -3911,12 +3911,18 @@ struct igb_ring_desc_16_bytes {
 		for (queue_id = 0; queue_id < nb_txq; queue_id++) {
 			ret = get_tx_ring_size(port_id, queue_id, &ring_size);
 
-			if (ret)
+			/* Do the check only for the active/configured ports. */
+			if (ret == -EINVAL)
+				continue;
+			if (ret) {
+				printf("failed to get ring size for TX "
+				       "queue(%u) Port(%u) - txpkts ignored\n",
+				       port_id, queue_id);
 				return true;
-
+			}
 			if (ring_size < nb_segs) {
-				printf("nb segments per TX packets=%u >= "
-				       "TX queue(%u) ring_size=%u - ignored\n",
+				printf("nb segments per TX packets=%u >= TX "
+				       "queue(%u) ring_size=%u - txpkts ignored\n",
 				       nb_segs, queue_id, ring_size);
 				return true;
 			}
@@ -3932,7 +3938,12 @@ struct igb_ring_desc_16_bytes {
 	uint16_t tx_pkt_len;
 	unsigned int i;
 
-	if (nb_segs_is_invalid(nb_segs))
+	/*
+	 * For single sengment settings failed check is ignored.
+	 * It is a very basic capability to send the single segment
+	 * packets, suppose it is always supported.
+	 */
+	if (nb_segs > 1 && nb_segs_is_invalid(nb_segs))
 		return;
 
 	/*
diff --git a/app/test-pmd/testpmd.c b/app/test-pmd/testpmd.c
index 33fc0fd..9ea0145 100644
--- a/app/test-pmd/testpmd.c
+++ b/app/test-pmd/testpmd.c
@@ -2575,6 +2575,11 @@ struct extmem_param {
 			port->need_reconfig_queues = 0;
 			/* setup tx queues */
 			for (qi = 0; qi < nb_txq; qi++) {
+				if (port->nb_tx_desc[qi] < tx_pkt_nb_segs) {
+					printf("Failed to setup TX queue: "
+					       "not enough descriptors\n");
+					goto fail;
+				}
 				if ((numa_support) &&
 					(txring_numa[pi] != NUMA_NO_CONFIG))
 					diag = rte_eth_tx_queue_setup(pi, qi,
@@ -2589,7 +2594,7 @@ struct extmem_param {
 
 				if (diag == 0)
 					continue;
-
+fail:
 				/* Fail to setup tx queue, return */
 				if (rte_atomic16_cmpset(&(port->port_status),
 							RTE_PORT_HANDLING,
-- 
1.8.3.1