[v5,1/4] net/i40e: cleanup Tx buffers
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Commit Message
Add support to the i40e driver for the API rte_eth_tx_done_cleanup
to force free consumed buffers on Tx ring.
Signed-off-by: Chenxu Di <chenxux.di@intel.com>
---
drivers/net/i40e/i40e_ethdev.c | 1 +
drivers/net/i40e/i40e_ethdev_vf.c | 1 +
drivers/net/i40e/i40e_rxtx.c | 122 ++++++++++++++++++++++++++++++
drivers/net/i40e/i40e_rxtx.h | 1 +
4 files changed, 125 insertions(+)
Comments
-----Original Message-----
From: Di, ChenxuX
Sent: Friday, December 27, 2019 11:45
To: dev@dpdk.org
Cc: Yang, Qiming <qiming.yang@intel.com>; Xing, Beilei <beilei.xing@intel.com>; Di, ChenxuX <chenxux.di@intel.com>
Subject: [PATCH v5 1/4] net/i40e: cleanup Tx buffers
Add support to the i40e driver for the API rte_eth_tx_done_cleanup to force free consumed buffers on Tx ring.
Signed-off-by: Chenxu Di <chenxux.di@intel.com>
---
drivers/net/i40e/i40e_ethdev.c | 1 +
drivers/net/i40e/i40e_ethdev_vf.c | 1 +
drivers/net/i40e/i40e_rxtx.c | 122 ++++++++++++++++++++++++++++++
drivers/net/i40e/i40e_rxtx.h | 1 +
4 files changed, 125 insertions(+)
diff --git a/drivers/net/i40e/i40e_ethdev.c b/drivers/net/i40e/i40e_ethdev.c index 5999c964b..fad47a942 100644
--- a/drivers/net/i40e/i40e_ethdev.c
+++ b/drivers/net/i40e/i40e_ethdev.c
@@ -522,6 +522,7 @@ static const struct eth_dev_ops i40e_eth_dev_ops = {
.mac_addr_set = i40e_set_default_mac_addr,
.mtu_set = i40e_dev_mtu_set,
.tm_ops_get = i40e_tm_ops_get,
+ .tx_done_cleanup = i40e_tx_done_cleanup,
};
/* store statistics names and its offset in stats structure */ diff --git a/drivers/net/i40e/i40e_ethdev_vf.c b/drivers/net/i40e/i40e_ethdev_vf.c
index 5dba0928b..0ca5417d7 100644
--- a/drivers/net/i40e/i40e_ethdev_vf.c
+++ b/drivers/net/i40e/i40e_ethdev_vf.c
@@ -215,6 +215,7 @@ static const struct eth_dev_ops i40evf_eth_dev_ops = {
.rss_hash_conf_get = i40evf_dev_rss_hash_conf_get,
.mtu_set = i40evf_dev_mtu_set,
.mac_addr_set = i40evf_set_default_mac_addr,
+ .tx_done_cleanup = i40e_tx_done_cleanup,
};
/*
diff --git a/drivers/net/i40e/i40e_rxtx.c b/drivers/net/i40e/i40e_rxtx.c index 17dc8c78f..9e4b0b678 100644
--- a/drivers/net/i40e/i40e_rxtx.c
+++ b/drivers/net/i40e/i40e_rxtx.c
@@ -2455,6 +2455,128 @@ i40e_tx_queue_release_mbufs(struct i40e_tx_queue *txq)
}
}
+int i40e_tx_done_cleanup(void *q, uint32_t free_cnt) {
+ struct i40e_tx_queue *txq = (struct i40e_tx_queue *)q;
+ struct i40e_tx_entry *sw_ring;
+ volatile struct i40e_tx_desc *txr;
+ uint16_t tx_first; /* First segment analyzed. */
+ uint16_t tx_id; /* Current segment being processed. */
+ uint16_t tx_last; /* Last segment in the current packet. */
+ uint16_t tx_next; /* First segment of the next packet. */
+ int count;
+
+ if (txq == NULL)
+ return -ENODEV;
+
+ count = 0;
+ sw_ring = txq->sw_ring;
+ txr = txq->tx_ring;
+
+ /*
+ * tx_tail is the last sent packet on the sw_ring. Goto the end
+ * of that packet (the last segment in the packet chain) and
+ * then the next segment will be the start of the oldest segment
+ * in the sw_ring. This is the first packet that will be
+ * attempted to be freed.
+ */
+
+ /* Get last segment in most recently added packet. */
+ tx_last = sw_ring[txq->tx_tail].last_id;
+
+ /* Get the next segment, which is the oldest segment in ring. */
+ tx_first = sw_ring[tx_last].next_id;
+
+ /* Set the current index to the first. */
+ tx_id = tx_first;
+
+ /*
+ * Loop through each packet. For each packet, verify that an
+ * mbuf exists and that the last segment is free. If so, free
+ * it and move on.
+ */
+ while (1) {
+ tx_last = sw_ring[tx_id].last_id;
+
+ if (sw_ring[tx_last].mbuf) {
+ if ((txr[tx_last].cmd_type_offset_bsz &
+ rte_cpu_to_le_64(I40E_TXD_QW1_DTYPE_MASK)) ==
+ rte_cpu_to_le_64(I40E_TX_DESC_DTYPE_DESC_DONE)) {
+ /* Get the start of the next packet. */
+ tx_next = sw_ring[tx_last].next_id;
+
+ /*
+ * Loop through all segments in a
+ * packet.
+ */
+ do {
+ rte_pktmbuf_free_seg(sw_ring[tx_id].mbuf);
+ sw_ring[tx_id].mbuf = NULL;
+ sw_ring[tx_id].last_id = tx_id;
+
+ /* Move to next segment. */
+ tx_id = sw_ring[tx_id].next_id;
+
+ } while (tx_id != tx_next);
+
+ /*
+ * Increment the number of packets
+ * freed.
+ */
+ count++;
+
+ if (unlikely(count == (int)free_cnt))
+ break;
+ } else {
If the else is just break, then this if can be deleted.
Please follow clean code, remove unnecessary tabs.
+ /*
+ * mbuf still in use, nothing left to
+ * free.
+ */
+ break;
+ }
+ } else {
+ /*
+ * There are multiple reasons to be here:
+ * 1) All the packets on the ring have been
+ * freed - tx_id is equal to tx_first
+ * and some packets have been freed.
+ * - Done, exit
+ * 2) Interfaces has not sent a rings worth of
+ * packets yet, so the segment after tail is
+ * still empty. Or a previous call to this
+ * function freed some of the segments but
+ * not all so there is a hole in the list.
+ * Hopefully this is a rare case.
+ * - Walk the list and find the next mbuf. If
+ * there isn't one, then done.
+ */
+ if (likely(tx_id == tx_first && count != 0))
+ break;
+
+ /*
+ * Walk the list and find the next mbuf, if any.
+ */
+ do {
+ /* Move to next segment. */
+ tx_id = sw_ring[tx_id].next_id;
+
+ if (sw_ring[tx_id].mbuf)
+ break;
+
+ } while (tx_id != tx_first);
+
+ /*
+ * Determine why previous loop bailed. If there
+ * is not an mbuf, done.
+ */
+ if (sw_ring[tx_id].mbuf == NULL)
+ break;
+ }
+ }
+
+ return count;
+}
+
void
i40e_reset_tx_queue(struct i40e_tx_queue *txq) { diff --git a/drivers/net/i40e/i40e_rxtx.h b/drivers/net/i40e/i40e_rxtx.h index 2106bb355..8f11f011a 100644
--- a/drivers/net/i40e/i40e_rxtx.h
+++ b/drivers/net/i40e/i40e_rxtx.h
@@ -212,6 +212,7 @@ void i40e_dev_free_queues(struct rte_eth_dev *dev); void i40e_reset_rx_queue(struct i40e_rx_queue *rxq); void i40e_reset_tx_queue(struct i40e_tx_queue *txq); void i40e_tx_queue_release_mbufs(struct i40e_tx_queue *txq);
+int i40e_tx_done_cleanup(void *txq, uint32_t free_cnt);
int i40e_alloc_rx_queue_mbufs(struct i40e_rx_queue *rxq); void i40e_rx_queue_release_mbufs(struct i40e_rx_queue *rxq);
--
2.17.1
@@ -522,6 +522,7 @@ static const struct eth_dev_ops i40e_eth_dev_ops = {
.mac_addr_set = i40e_set_default_mac_addr,
.mtu_set = i40e_dev_mtu_set,
.tm_ops_get = i40e_tm_ops_get,
+ .tx_done_cleanup = i40e_tx_done_cleanup,
};
/* store statistics names and its offset in stats structure */
@@ -215,6 +215,7 @@ static const struct eth_dev_ops i40evf_eth_dev_ops = {
.rss_hash_conf_get = i40evf_dev_rss_hash_conf_get,
.mtu_set = i40evf_dev_mtu_set,
.mac_addr_set = i40evf_set_default_mac_addr,
+ .tx_done_cleanup = i40e_tx_done_cleanup,
};
/*
@@ -2455,6 +2455,128 @@ i40e_tx_queue_release_mbufs(struct i40e_tx_queue *txq)
}
}
+int i40e_tx_done_cleanup(void *q, uint32_t free_cnt)
+{
+ struct i40e_tx_queue *txq = (struct i40e_tx_queue *)q;
+ struct i40e_tx_entry *sw_ring;
+ volatile struct i40e_tx_desc *txr;
+ uint16_t tx_first; /* First segment analyzed. */
+ uint16_t tx_id; /* Current segment being processed. */
+ uint16_t tx_last; /* Last segment in the current packet. */
+ uint16_t tx_next; /* First segment of the next packet. */
+ int count;
+
+ if (txq == NULL)
+ return -ENODEV;
+
+ count = 0;
+ sw_ring = txq->sw_ring;
+ txr = txq->tx_ring;
+
+ /*
+ * tx_tail is the last sent packet on the sw_ring. Goto the end
+ * of that packet (the last segment in the packet chain) and
+ * then the next segment will be the start of the oldest segment
+ * in the sw_ring. This is the first packet that will be
+ * attempted to be freed.
+ */
+
+ /* Get last segment in most recently added packet. */
+ tx_last = sw_ring[txq->tx_tail].last_id;
+
+ /* Get the next segment, which is the oldest segment in ring. */
+ tx_first = sw_ring[tx_last].next_id;
+
+ /* Set the current index to the first. */
+ tx_id = tx_first;
+
+ /*
+ * Loop through each packet. For each packet, verify that an
+ * mbuf exists and that the last segment is free. If so, free
+ * it and move on.
+ */
+ while (1) {
+ tx_last = sw_ring[tx_id].last_id;
+
+ if (sw_ring[tx_last].mbuf) {
+ if ((txr[tx_last].cmd_type_offset_bsz &
+ rte_cpu_to_le_64(I40E_TXD_QW1_DTYPE_MASK)) ==
+ rte_cpu_to_le_64(I40E_TX_DESC_DTYPE_DESC_DONE)) {
+ /* Get the start of the next packet. */
+ tx_next = sw_ring[tx_last].next_id;
+
+ /*
+ * Loop through all segments in a
+ * packet.
+ */
+ do {
+ rte_pktmbuf_free_seg(sw_ring[tx_id].mbuf);
+ sw_ring[tx_id].mbuf = NULL;
+ sw_ring[tx_id].last_id = tx_id;
+
+ /* Move to next segment. */
+ tx_id = sw_ring[tx_id].next_id;
+
+ } while (tx_id != tx_next);
+
+ /*
+ * Increment the number of packets
+ * freed.
+ */
+ count++;
+
+ if (unlikely(count == (int)free_cnt))
+ break;
+ } else {
+ /*
+ * mbuf still in use, nothing left to
+ * free.
+ */
+ break;
+ }
+ } else {
+ /*
+ * There are multiple reasons to be here:
+ * 1) All the packets on the ring have been
+ * freed - tx_id is equal to tx_first
+ * and some packets have been freed.
+ * - Done, exit
+ * 2) Interfaces has not sent a rings worth of
+ * packets yet, so the segment after tail is
+ * still empty. Or a previous call to this
+ * function freed some of the segments but
+ * not all so there is a hole in the list.
+ * Hopefully this is a rare case.
+ * - Walk the list and find the next mbuf. If
+ * there isn't one, then done.
+ */
+ if (likely(tx_id == tx_first && count != 0))
+ break;
+
+ /*
+ * Walk the list and find the next mbuf, if any.
+ */
+ do {
+ /* Move to next segment. */
+ tx_id = sw_ring[tx_id].next_id;
+
+ if (sw_ring[tx_id].mbuf)
+ break;
+
+ } while (tx_id != tx_first);
+
+ /*
+ * Determine why previous loop bailed. If there
+ * is not an mbuf, done.
+ */
+ if (sw_ring[tx_id].mbuf == NULL)
+ break;
+ }
+ }
+
+ return count;
+}
+
void
i40e_reset_tx_queue(struct i40e_tx_queue *txq)
{
@@ -212,6 +212,7 @@ void i40e_dev_free_queues(struct rte_eth_dev *dev);
void i40e_reset_rx_queue(struct i40e_rx_queue *rxq);
void i40e_reset_tx_queue(struct i40e_tx_queue *txq);
void i40e_tx_queue_release_mbufs(struct i40e_tx_queue *txq);
+int i40e_tx_done_cleanup(void *txq, uint32_t free_cnt);
int i40e_alloc_rx_queue_mbufs(struct i40e_rx_queue *rxq);
void i40e_rx_queue_release_mbufs(struct i40e_rx_queue *rxq);