patches for DPDK stable branches
 help / color / mirror / Atom feed
* [dpdk-stable] [PATCH] app/testpmd: fix random number of Tx segments
@ 2021-09-02  8:20 Alvin Zhang
  2021-09-06  8:58 ` Li, Xiaoyun
       [not found] ` <20210917013923.4004-1-alvinx.zhang@intel.com>
  0 siblings, 2 replies; 20+ messages in thread
From: Alvin Zhang @ 2021-09-02  8:20 UTC (permalink / raw)
  To: xiaoyun.li, konstantin.ananyev; +Cc: dev, Alvin Zhang, stable

When random number of segments in Tx packets is enabled,
the total data space length of all segments must be greater
or equal than the size of an Eth/IP/UDP/timestamp packet,
that's total 14 + 20 + 8 + 16 bytes. Otherwise the Tx engine
may cause the application to crash.

Bugzilla ID: 797
Fixes: 79bec05b32b7 ("app/testpmd: add ability to split outgoing packets")
Cc: stable@dpdk.org

Signed-off-by: Alvin Zhang <alvinx.zhang@intel.com>
---
 app/test-pmd/config.c  | 16 +++++++++++-----
 app/test-pmd/testpmd.c |  5 +++++
 app/test-pmd/testpmd.h |  5 +++++
 app/test-pmd/txonly.c  |  7 +++++--
 4 files changed, 26 insertions(+), 7 deletions(-)

diff --git a/app/test-pmd/config.c b/app/test-pmd/config.c
index 31d8ba1..5105b3b 100644
--- a/app/test-pmd/config.c
+++ b/app/test-pmd/config.c
@@ -3837,10 +3837,11 @@ struct igb_ring_desc_16_bytes {
 	 * Check that each segment length is greater or equal than
 	 * the mbuf data size.
 	 * Check also that the total packet length is greater or equal than the
-	 * size of an empty UDP/IP packet (sizeof(struct rte_ether_hdr) +
-	 * 20 + 8).
+	 * size of an Eth/IP/UDP + timestamp packet
+	 * (sizeof(struct rte_ether_hdr) + 20 + 8 + 16).
 	 */
 	tx_pkt_len = 0;
+	tx_pkt_nb_min_segs = 0;
 	for (i = 0; i < nb_segs; i++) {
 		if (seg_lengths[i] > mbuf_data_size[0]) {
 			fprintf(stderr,
@@ -3849,11 +3850,16 @@ struct igb_ring_desc_16_bytes {
 			return;
 		}
 		tx_pkt_len = (uint16_t)(tx_pkt_len + seg_lengths[i]);
+
+		if (!tx_pkt_nb_min_segs &&
+		    tx_pkt_len >= (sizeof(struct rte_ether_hdr) + 20 + 8 + 16))
+			tx_pkt_nb_min_segs = i + 1;
 	}
-	if (tx_pkt_len < (sizeof(struct rte_ether_hdr) + 20 + 8)) {
+
+	if (!tx_pkt_nb_min_segs) {
 		fprintf(stderr, "total packet length=%u < %d - give up\n",
-				(unsigned) tx_pkt_len,
-				(int)(sizeof(struct rte_ether_hdr) + 20 + 8));
+			(unsigned int) tx_pkt_len,
+			(int)(sizeof(struct rte_ether_hdr) + 20 + 8 + 16));
 		return;
 	}
 
diff --git a/app/test-pmd/testpmd.c b/app/test-pmd/testpmd.c
index 6cbe9ba..c496e59 100644
--- a/app/test-pmd/testpmd.c
+++ b/app/test-pmd/testpmd.c
@@ -232,6 +232,11 @@ struct fwd_engine * fwd_engines[] = {
 };
 uint8_t  tx_pkt_nb_segs = 1; /**< Number of segments in TXONLY packets */
 
+/**< Minimum number of segments in TXONLY packets to accommodate all packet
+ * headers.
+ */
+uint8_t  tx_pkt_nb_min_segs = 1;
+
 enum tx_pkt_split tx_pkt_split = TX_PKT_SPLIT_OFF;
 /**< Split policy for packets to TX. */
 
diff --git a/app/test-pmd/testpmd.h b/app/test-pmd/testpmd.h
index 16a3598..f5bc427 100644
--- a/app/test-pmd/testpmd.h
+++ b/app/test-pmd/testpmd.h
@@ -464,6 +464,11 @@ enum dcb_mode_enable
 extern uint16_t tx_pkt_length; /**< Length of TXONLY packet */
 extern uint16_t tx_pkt_seg_lengths[RTE_MAX_SEGS_PER_PKT]; /**< Seg. lengths */
 extern uint8_t  tx_pkt_nb_segs; /**< Number of segments in TX packets */
+
+/**< Minimum number of segments in TXONLY packets to accommodate all packet
+ * headers.
+ */
+extern uint8_t  tx_pkt_nb_min_segs;
 extern uint32_t tx_pkt_times_intra;
 extern uint32_t tx_pkt_times_inter;
 
diff --git a/app/test-pmd/txonly.c b/app/test-pmd/txonly.c
index aed820f..27e4458 100644
--- a/app/test-pmd/txonly.c
+++ b/app/test-pmd/txonly.c
@@ -195,8 +195,11 @@
 	uint32_t nb_segs, pkt_len;
 	uint8_t i;
 
-	if (unlikely(tx_pkt_split == TX_PKT_SPLIT_RND))
-		nb_segs = rte_rand() % tx_pkt_nb_segs + 1;
+	if (unlikely(tx_pkt_split == TX_PKT_SPLIT_RND) &&
+	    tx_pkt_nb_segs > tx_pkt_nb_min_segs)
+		nb_segs = rte_rand() %
+			  (tx_pkt_nb_segs - tx_pkt_nb_min_segs + 1) +
+			  tx_pkt_nb_min_segs;
 	else
 		nb_segs = tx_pkt_nb_segs;
 
-- 
1.8.3.1


^ permalink raw reply	[flat|nested] 20+ messages in thread

end of thread, other threads:[~2021-10-08 17:01 UTC | newest]

Thread overview: 20+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2021-09-02  8:20 [dpdk-stable] [PATCH] app/testpmd: fix random number of Tx segments Alvin Zhang
2021-09-06  8:58 ` Li, Xiaoyun
2021-09-06 10:03   ` Zhang, AlvinX
2021-09-06 10:54     ` Li, Xiaoyun
2021-09-07  2:25       ` Zhang, AlvinX
2021-09-07  8:05         ` Li, Xiaoyun
     [not found] ` <20210917013923.4004-1-alvinx.zhang@intel.com>
2021-09-17  1:39   ` [dpdk-stable] [PATCH v2 2/2] app/testpmd: fix txonly forwording Alvin Zhang
     [not found]   ` <20210918030659.12448-1-alvinx.zhang@intel.com>
2021-09-18  3:06     ` [dpdk-stable] [PATCH v3 " Alvin Zhang
2021-09-18  8:20       ` Li, Xiaoyun
2021-09-22  2:49     ` [dpdk-stable] [PATCH v4 1/2] app/testpmd: update forward engine beginning Alvin Zhang
2021-09-22  2:49       ` [dpdk-stable] [PATCH v4 2/2] app/testpmd: fix txonly forwording Alvin Zhang
2021-09-22  5:58         ` Li, Xiaoyun
2021-09-22  5:59       ` [dpdk-stable] [PATCH v4 1/2] app/testpmd: update forward engine beginning Li, Xiaoyun
2021-09-23  1:49       ` [dpdk-stable] [PATCH v5 " Alvin Zhang
2021-09-23  1:49         ` [dpdk-stable] [PATCH v5 2/2] app/testpmd: fix txonly forwording Alvin Zhang
2021-09-23  4:25           ` Ivan Malov
2021-09-23  5:11             ` Zhang, AlvinX
2021-09-23  8:01         ` [dpdk-stable] [PATCH v6 1/2] app/testpmd: update forward engine beginning Alvin Zhang
2021-09-23  8:01           ` [dpdk-stable] [PATCH v6 2/2] app/testpmd: fix txonly forwarding Alvin Zhang
2021-10-08 17:01           ` [dpdk-stable] [PATCH v6 1/2] app/testpmd: update forward engine beginning Ferruh Yigit

patches for DPDK stable branches

This inbox may be cloned and mirrored by anyone:

	git clone --mirror http://inbox.dpdk.org/stable/0 stable/git/0.git

	# If you have public-inbox 1.1+ installed, you may
	# initialize and index your mirror using the following commands:
	public-inbox-init -V2 stable stable/ http://inbox.dpdk.org/stable \
		stable@dpdk.org
	public-inbox-index stable

Example config snippet for mirrors.
Newsgroup available over NNTP:
	nntp://inbox.dpdk.org/inbox.dpdk.stable


AGPL code for this site: git clone https://public-inbox.org/public-inbox.git