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From: Gagandeep Singh <g.singh@nxp.com>
To: dev@dpdk.org,
Sachin Saxena <sachin.saxena@nxp.com>
Cc: Jun Yang <jun.yang@nxp.com>
Subject: [v2 24/30] dma/dpaa: improve congestion handling
Date: Mon, 22 Jul 2024 17:28:37 +0530
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From: Jun Yang <jun.yang@nxp.com>
The congestion issue occurs frequently on low speed device(PCIe).
We should drain the command queue to make dma work when congestion occurs.
Signed-off-by: Jun Yang <jun.yang@nxp.com>
---
drivers/dma/dpaa/dpaa_qdma.c | 157 +++++++++++++++++++----------------
1 file changed, 85 insertions(+), 72 deletions(-)
diff --git a/drivers/dma/dpaa/dpaa_qdma.c b/drivers/dma/dpaa/dpaa_qdma.c
index de5ecc7d0b..eaa5f81f6d 100644
--- a/drivers/dma/dpaa/dpaa_qdma.c
+++ b/drivers/dma/dpaa/dpaa_qdma.c
@@ -535,73 +535,6 @@ fsl_qdma_reg_init(struct fsl_qdma_engine *fsl_qdma)
return 0;
}
-static int
-fsl_qdma_enqueue_desc_to_ring(struct fsl_qdma_queue *fsl_queue,
- int is_burst)
-{
- uint16_t i, num = fsl_queue->pending_num, idx, start;
- int ret;
-
- num = is_burst ? fsl_queue->pending_num : 1;
-
- fsl_queue->desc_in_hw[fsl_queue->ci] = num;
- ret = rte_ring_enqueue(fsl_queue->complete_burst,
- &fsl_queue->desc_in_hw[fsl_queue->ci]);
- if (ret) {
- DPAA_QDMA_ERR("%s: Queue is full, try dequeue first",
- __func__);
- DPAA_QDMA_ERR("%s: submitted:%"PRIu64", completed:%"PRIu64"",
- __func__, fsl_queue->stats.submitted,
- fsl_queue->stats.completed);
- return ret;
- }
- start = fsl_queue->pending_start;
- for (i = 0; i < num; i++) {
- idx = (start + i) & (fsl_queue->pending_max - 1);
- ret = rte_ring_enqueue(fsl_queue->complete_desc,
- &fsl_queue->pending_desc[idx]);
- if (ret) {
- DPAA_QDMA_ERR("Descriptors eq failed!\r\n");
- return ret;
- }
- }
-
- return 0;
-}
-
-static int
-fsl_qdma_enqueue_desc_single(struct fsl_qdma_queue *fsl_queue,
- dma_addr_t dst, dma_addr_t src, size_t len)
-{
- uint8_t *block = fsl_queue->block_vir;
- struct fsl_qdma_comp_sg_desc *csgf_src, *csgf_dest;
- struct fsl_qdma_cmpd_ft *ft;
- int ret;
-
- ft = fsl_queue->ft[fsl_queue->ci];
- csgf_src = &ft->desc_sbuf;
- csgf_dest = &ft->desc_dbuf;
- qdma_desc_sge_addr_set64(csgf_src, src);
- csgf_src->length = len;
- csgf_src->extion = 0;
- qdma_desc_sge_addr_set64(csgf_dest, dst);
- csgf_dest->length = len;
- csgf_dest->extion = 0;
- /* This entry is the last entry. */
- csgf_dest->final = 1;
-
- ret = fsl_qdma_enqueue_desc_to_ring(fsl_queue, 0);
- if (ret)
- return ret;
- fsl_queue->ci = (fsl_queue->ci + 1) & (fsl_queue->n_cq - 1);
-
- qdma_writel(fsl_queue->le_cqmr | FSL_QDMA_BCQMR_EI,
- block + FSL_QDMA_BCQMR(fsl_queue->queue_id));
- fsl_queue->stats.submitted++;
-
- return 0;
-}
-
static uint16_t
dpaa_qdma_block_dequeue(struct fsl_qdma_engine *fsl_qdma,
uint8_t block_id)
@@ -633,7 +566,6 @@ dpaa_qdma_block_dequeue(struct fsl_qdma_engine *fsl_qdma,
ret = qdma_ccdf_get_queue(&cq[start], &qid);
if (ret == true) {
cmd_queue = &fsl_qdma->cmd_queues[block_id][qid];
- cmd_queue->stats.completed++;
ret = rte_ring_dequeue(cmd_queue->complete_burst,
(void **)&dq_complete);
@@ -677,6 +609,87 @@ dpaa_qdma_block_dequeue(struct fsl_qdma_engine *fsl_qdma,
return count;
}
+static int
+fsl_qdma_enqueue_desc_to_ring(struct fsl_qdma_queue *fsl_queue,
+ int is_burst)
+{
+ uint16_t i, num = fsl_queue->pending_num, idx, start, dq;
+ int ret, dq_cnt;
+
+ num = is_burst ? fsl_queue->pending_num : 1;
+
+ fsl_queue->desc_in_hw[fsl_queue->ci] = num;
+eq_again:
+ ret = rte_ring_enqueue(fsl_queue->complete_burst,
+ &fsl_queue->desc_in_hw[fsl_queue->ci]);
+ if (ret) {
+ DPAA_QDMA_DP_DEBUG("%s: Queue is full, try dequeue first",
+ __func__);
+ DPAA_QDMA_DP_DEBUG("%s: submitted:%"PRIu64", completed:%"PRIu64"",
+ __func__, fsl_queue->stats.submitted,
+ fsl_queue->stats.completed);
+ dq_cnt = 0;
+dq_again:
+ dq = dpaa_qdma_block_dequeue(fsl_queue->engine,
+ fsl_queue->block_id);
+ dq_cnt++;
+ if (dq > 0) {
+ goto eq_again;
+ } else {
+ if (dq_cnt < 100)
+ goto dq_again;
+ DPAA_QDMA_ERR("%s: Dq block%d failed!",
+ __func__, fsl_queue->block_id);
+ }
+ return ret;
+ }
+ start = fsl_queue->pending_start;
+ for (i = 0; i < num; i++) {
+ idx = (start + i) & (fsl_queue->pending_max - 1);
+ ret = rte_ring_enqueue(fsl_queue->complete_desc,
+ &fsl_queue->pending_desc[idx]);
+ if (ret) {
+ DPAA_QDMA_ERR("Descriptors eq failed!\r\n");
+ return ret;
+ }
+ }
+
+ return 0;
+}
+
+static int
+fsl_qdma_enqueue_desc_single(struct fsl_qdma_queue *fsl_queue,
+ dma_addr_t dst, dma_addr_t src, size_t len)
+{
+ uint8_t *block = fsl_queue->block_vir;
+ struct fsl_qdma_comp_sg_desc *csgf_src, *csgf_dest;
+ struct fsl_qdma_cmpd_ft *ft;
+ int ret;
+
+ ft = fsl_queue->ft[fsl_queue->ci];
+ csgf_src = &ft->desc_sbuf;
+ csgf_dest = &ft->desc_dbuf;
+ qdma_desc_sge_addr_set64(csgf_src, src);
+ csgf_src->length = len;
+ csgf_src->extion = 0;
+ qdma_desc_sge_addr_set64(csgf_dest, dst);
+ csgf_dest->length = len;
+ csgf_dest->extion = 0;
+ /* This entry is the last entry. */
+ csgf_dest->final = 1;
+
+ ret = fsl_qdma_enqueue_desc_to_ring(fsl_queue, 0);
+ if (ret)
+ return ret;
+ fsl_queue->ci = (fsl_queue->ci + 1) & (fsl_queue->n_cq - 1);
+
+ qdma_writel(fsl_queue->le_cqmr | FSL_QDMA_BCQMR_EI,
+ block + FSL_QDMA_BCQMR(fsl_queue->queue_id));
+ fsl_queue->stats.submitted++;
+
+ return 0;
+}
+
static int
fsl_qdma_enqueue_overflow(struct fsl_qdma_queue *fsl_queue)
{
@@ -702,7 +715,7 @@ fsl_qdma_enqueue_overflow(struct fsl_qdma_queue *fsl_queue)
if (likely(!overflow))
return 0;
- DPAA_QDMA_ERR("TC%d/Q%d submitted(%"PRIu64")-completed(%"PRIu64") >= %d",
+ DPAA_QDMA_DP_DEBUG("TC%d/Q%d submitted(%"PRIu64")-completed(%"PRIu64") >= %d",
fsl_queue->block_id, fsl_queue->queue_id,
st->submitted, st->completed, QDMA_QUEUE_CR_WM);
drain_num = 0;
@@ -712,7 +725,7 @@ fsl_qdma_enqueue_overflow(struct fsl_qdma_queue *fsl_queue)
fsl_queue->block_id);
if (!blk_drain) {
drain_num++;
- if (drain_num > 100) {
+ if (drain_num > 1000) {
DPAA_QDMA_ERR("TC%d failed drain, Q%d's %"PRIu64" bd in HW.",
fsl_queue->block_id, fsl_queue->queue_id,
st->submitted - st->completed);
@@ -721,8 +734,8 @@ fsl_qdma_enqueue_overflow(struct fsl_qdma_queue *fsl_queue)
goto drain_again;
}
check_num++;
- if (check_num > 10) {
- DPAA_QDMA_ERR("TC%d failed drain, Q%d's %"PRIu64" bd in HW.",
+ if (check_num > 1000) {
+ DPAA_QDMA_ERR("TC%d failed check, Q%d's %"PRIu64" bd in HW.",
fsl_queue->block_id, fsl_queue->queue_id,
st->submitted - st->completed);
return -ENOSPC;
--
2.25.1