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[v3,05/16] net/dpaa2: fix the prefetch Rx to honor nb pkts

Message ID 1530864613-11754-5-git-send-email-hemant.agrawal@nxp.com
State Accepted
Commit 65a70a98f1dbbff474d54151337f05d4752932a1
Headers show
Series [v3,01/16] bus/dpaa: fix phandle support for kernel 4.16 | expand

Commit Message

Hemant Agrawal July 6, 2018, 8:10 a.m. UTC 
This patch fixes prefetch rx routine to
set the next prefetch request to the size of nb_pkts.
It assumes that next request would ideally be
of same size.

Fixes: 4bc5ab88dbd6 ("net/dpaa2: fix Tx only mode")
Cc: stable@dpdk.org

Signed-off-by: Hemant Agrawal <hemant.agrawal@nxp.com>

Acked-by: Shreyansh Jain <shreyansh.jain@nxp.com>

---
 drivers/net/dpaa2/dpaa2_rxtx.c | 16 +++++++++++-----
 1 file changed, 11 insertions(+), 5 deletions(-)

-- 
2.7.4
diff mbox series

Patch

diff --git a/drivers/net/dpaa2/dpaa2_rxtx.c b/drivers/net/dpaa2/dpaa2_rxtx.c
index dac086d..ef109a6 100644
--- a/drivers/net/dpaa2/dpaa2_rxtx.c
+++ b/drivers/net/dpaa2/dpaa2_rxtx.c
@@ -447,6 +447,12 @@  eth_copy_mbuf_to_fd(struct rte_mbuf *mbuf,
 return 0;
 }
 
+/* This function assumes that caller will be keep the same value for nb_pkts
+ * across calls per queue, if that is not the case, better use non-prefetch
+ * version of rx call.
+ * It will return the packets as requested in previous call without honoring
+ * the current nb_pkts or bufs space.
+ */
 uint16_t
 dpaa2_dev_prefetch_rx(void *queue, struct rte_mbuf **bufs, uint16_t nb_pkts)
 {
@@ -454,7 +460,7 @@  dpaa2_dev_prefetch_rx(void *queue, struct rte_mbuf **bufs, uint16_t nb_pkts)
 	struct dpaa2_queue *dpaa2_q = (struct dpaa2_queue *)queue;
 	struct qbman_result *dq_storage, *dq_storage1 = NULL;
 	uint32_t fqid = dpaa2_q->fqid;
-	int ret, num_rx = 0;
+	int ret, num_rx = 0, pull_size;
 	uint8_t pending, status;
 	struct qbman_swp *swp;
 	const struct qbman_fd *fd, *next_fd;
@@ -470,12 +476,12 @@  dpaa2_dev_prefetch_rx(void *queue, struct rte_mbuf **bufs, uint16_t nb_pkts)
 		}
 	}
 	swp = DPAA2_PER_LCORE_ETHRX_PORTAL;
-
+	pull_size = (nb_pkts > DPAA2_DQRR_RING_SIZE) ?
+					       DPAA2_DQRR_RING_SIZE : nb_pkts;
 	if (unlikely(!q_storage->active_dqs)) {
 		q_storage->toggle = 0;
 		dq_storage = q_storage->dq_storage[q_storage->toggle];
-		q_storage->last_num_pkts = (nb_pkts > DPAA2_DQRR_RING_SIZE) ?
-					       DPAA2_DQRR_RING_SIZE : nb_pkts;
+		q_storage->last_num_pkts = pull_size;
 		qbman_pull_desc_clear(&pulldesc);
 		qbman_pull_desc_set_numframes(&pulldesc,
 					      q_storage->last_num_pkts);
@@ -514,7 +520,7 @@  dpaa2_dev_prefetch_rx(void *queue, struct rte_mbuf **bufs, uint16_t nb_pkts)
 	q_storage->toggle ^= 1;
 	dq_storage1 = q_storage->dq_storage[q_storage->toggle];
 	qbman_pull_desc_clear(&pulldesc);
-	qbman_pull_desc_set_numframes(&pulldesc, DPAA2_DQRR_RING_SIZE);
+	qbman_pull_desc_set_numframes(&pulldesc, pull_size);
 	qbman_pull_desc_set_fq(&pulldesc, fqid);
 	qbman_pull_desc_set_storage(&pulldesc, dq_storage1,
 		(uint64_t)(DPAA2_VADDR_TO_IOVA(dq_storage1)), 1);