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From: Hemant Agrawal <hemant.agrawal@nxp.com>
To: <dev@dpdk.org>
CC: Nipun Gupta <nipun.gupta@nxp.com>
Date: Mon, 24 Jul 2017 13:01:46 +0530
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Subject: [dpdk-dev] [PATCH] net/dpaa2: enable Tx congestion state check
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X-List-Received-Date: Mon, 24 Jul 2017 07:31:55 -0000
For larger packet size congestion is observed on Tx Queues.
This patch enables Tx Queue congestion state check support.
If congested, try to resend the packet few times.
Signed-off-by: Nipun Gupta <nipun.gupta@nxp.com>
Signed-off-by: Hemant Agrawal <hemant.agrawal@nxp.com>
---
drivers/net/dpaa2/dpaa2_ethdev.c | 2 +-
drivers/net/dpaa2/dpaa2_ethdev.h | 4 +++-
drivers/net/dpaa2/dpaa2_rxtx.c | 11 ++++++++---
3 files changed, 12 insertions(+), 5 deletions(-)
diff --git a/drivers/net/dpaa2/dpaa2_ethdev.c b/drivers/net/dpaa2/dpaa2_ethdev.c
index c662505..429b3a0 100644
--- a/drivers/net/dpaa2/dpaa2_ethdev.c
+++ b/drivers/net/dpaa2/dpaa2_ethdev.c
@@ -488,7 +488,7 @@ dpaa2_dev_tx_queue_setup(struct rte_eth_dev *dev,
}
dpaa2_q->tc_index = tc_id;
- if (priv->flags & DPAA2_TX_CGR_SUPPORT) {
+ if (!(priv->flags & DPAA2_TX_CGR_OFF)) {
struct dpni_congestion_notification_cfg cong_notif_cfg;
cong_notif_cfg.units = DPNI_CONGESTION_UNIT_FRAMES;
diff --git a/drivers/net/dpaa2/dpaa2_ethdev.h b/drivers/net/dpaa2/dpaa2_ethdev.h
index ea7c0db..a2902da 100644
--- a/drivers/net/dpaa2/dpaa2_ethdev.h
+++ b/drivers/net/dpaa2/dpaa2_ethdev.h
@@ -55,6 +55,8 @@
*/
#define CONG_EXIT_TX_THRESHOLD 480
+#define CONG_RETRY_COUNT 18000
+
/* RX queue tail drop threshold
* currently considering 32 KB packets
*/
@@ -66,7 +68,7 @@
/* Enable TX Congestion control support
* default is disable
*/
-#define DPAA2_TX_CGR_SUPPORT 0x01
+#define DPAA2_TX_CGR_OFF 0x01
/* Disable RX tail drop, default is enable */
#define DPAA2_RX_TAILDROP_OFF 0x04
diff --git a/drivers/net/dpaa2/dpaa2_rxtx.c b/drivers/net/dpaa2/dpaa2_rxtx.c
index 3db91d8..3c057a3 100644
--- a/drivers/net/dpaa2/dpaa2_rxtx.c
+++ b/drivers/net/dpaa2/dpaa2_rxtx.c
@@ -524,7 +524,7 @@ uint16_t
dpaa2_dev_tx(void *queue, struct rte_mbuf **bufs, uint16_t nb_pkts)
{
/* Function to transmit the frames to given device and VQ*/
- uint32_t loop;
+ uint32_t loop, retry_count;
int32_t ret;
struct qbman_fd fd_arr[MAX_TX_RING_SLOTS];
struct rte_mbuf *mi;
@@ -559,8 +559,13 @@ dpaa2_dev_tx(void *queue, struct rte_mbuf **bufs, uint16_t nb_pkts)
/*Clear the unused FD fields before sending*/
while (nb_pkts) {
/*Check if the queue is congested*/
- if (qbman_result_SCN_state_in_mem(dpaa2_q->cscn))
- goto skip_tx;
+ retry_count = 0;
+ if (qbman_result_SCN_state_in_mem(dpaa2_q->cscn)) {
+ retry_count++;
+ /* Retry for some time before giving up */
+ if (retry_count > CONG_RETRY_COUNT)
+ goto skip_tx;
+ }
frames_to_send = (nb_pkts >> 3) ? MAX_TX_RING_SLOTS : nb_pkts;
--
2.7.4