[dpdk-dev] [PATCH 0/2] net/netvsc: patches

[dpdk-dev] [PATCH 0/2] net/netvsc: patches

[Stephen Hemminger]

A couple of fixes for netvsc PMD.
The first is more serious than the second.

Stephen Hemminger (2):
  net/netvsc: handle receive packets during multi-channel setup
  net/netvsc: avoid mixing buffered and direct packets

 drivers/net/netvsc/hn_ethdev.c |  1 +
 drivers/net/netvsc/hn_nvs.c    | 40 ++++++++++++++++++++++++++++++++--
 drivers/net/netvsc/hn_rxtx.c   | 15 ++++++-------
 drivers/net/netvsc/hn_var.h    |  1 +
 4 files changed, 47 insertions(+), 10 deletions(-)

-- 
2.20.1

[dpdk-dev] [PATCH 1/2] net/netvsc: handle receive packets during multi-channel setup

[Stephen Hemminger]

It is possible for a packet to arrive during the configuration
process when setting up multiple queue mode. This would cause
configure to fail; fix by just ignoring receive packets while
waiting for control commands.

Add a spinlock to ensure that two control operations are not
attempted at once.

Fixes: 4e9c73e96e83 ("net/netvsc: add Hyper-V network device")
Cc: stable@dpdk.org
Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
---
 drivers/net/netvsc/hn_ethdev.c |  1 +
 drivers/net/netvsc/hn_nvs.c    | 40 ++++++++++++++++++++++++++++++++--
 drivers/net/netvsc/hn_var.h    |  1 +
 3 files changed, 40 insertions(+), 2 deletions(-)

diff --git a/drivers/net/netvsc/hn_ethdev.c b/drivers/net/netvsc/hn_ethdev.c
index 564620748daf..01e69de6f3e2 100644
--- a/drivers/net/netvsc/hn_ethdev.c
+++ b/drivers/net/netvsc/hn_ethdev.c
@@ -951,6 +951,7 @@ eth_hn_dev_init(struct rte_eth_dev *eth_dev)
 	hv->latency = HN_CHAN_LATENCY_NS;
 	hv->max_queues = 1;
 	rte_spinlock_init(&hv->vf_lock);
+	rte_spinlock_init(&hv->nvs_lock);
 	hv->vf_port = HN_INVALID_PORT;
 
 	err = hn_parse_args(eth_dev);
diff --git a/drivers/net/netvsc/hn_nvs.c b/drivers/net/netvsc/hn_nvs.c
index 6b518685ab6f..f56692f4d605 100644
--- a/drivers/net/netvsc/hn_nvs.c
+++ b/drivers/net/netvsc/hn_nvs.c
@@ -54,7 +54,7 @@ static int hn_nvs_req_send(struct hn_data *hv,
 }
 
 static int
-hn_nvs_execute(struct hn_data *hv,
+__hn_nvs_execute(struct hn_data *hv,
 	       void *req, uint32_t reqlen,
 	       void *resp, uint32_t resplen,
 	       uint32_t type)
@@ -62,6 +62,7 @@ hn_nvs_execute(struct hn_data *hv,
 	struct vmbus_channel *chan = hn_primary_chan(hv);
 	char buffer[NVS_RESPSIZE_MAX];
 	const struct hn_nvs_hdr *hdr;
+	uint64_t xactid;
 	uint32_t len;
 	int ret;
 
@@ -77,7 +78,7 @@ hn_nvs_execute(struct hn_data *hv,
 
  retry:
 	len = sizeof(buffer);
-	ret = rte_vmbus_chan_recv(chan, buffer, &len, NULL);
+	ret = rte_vmbus_chan_recv(chan, buffer, &len, &xactid);
 	if (ret == -EAGAIN) {
 		rte_delay_us(HN_CHAN_INTERVAL_US);
 		goto retry;
@@ -88,7 +89,20 @@ hn_nvs_execute(struct hn_data *hv,
 		return ret;
 	}
 
+	if (len < sizeof(*hdr)) {
+		PMD_DRV_LOG(ERR, "response missing NVS header");
+		return -EINVAL;
+	}
+
 	hdr = (struct hn_nvs_hdr *)buffer;
+
+	/* Silently drop received packets while waiting for response */
+	if (hdr->type == NVS_TYPE_RNDIS) {
+		hn_nvs_ack_rxbuf(chan, xactid);
+		--hv->rxbuf_outstanding;
+		goto retry;
+	}
+
 	if (hdr->type != type) {
 		PMD_DRV_LOG(ERR, "unexpected NVS resp %#x, expect %#x",
 			    hdr->type, type);
@@ -108,6 +122,28 @@ hn_nvs_execute(struct hn_data *hv,
 	return 0;
 }
 
+
+/*
+ * Execute one control command and get the response.
+ * Only one command can be active on a channel at once
+ * Unlike BSD, DPDK does not have an interrupt context
+ * so the polling is required to wait for response.
+ */
+static int
+hn_nvs_execute(struct hn_data *hv,
+	       void *req, uint32_t reqlen,
+	       void *resp, uint32_t resplen,
+	       uint32_t type)
+{
+	int ret;
+
+	rte_spinlock_lock(&hv->nvs_lock);
+	ret = __hn_nvs_execute(hv, req, reqlen, resp, resplen, type);
+	rte_spinlock_unlock(&hv->nvs_lock);
+
+	return ret;
+}
+
 static int
 hn_nvs_doinit(struct hn_data *hv, uint32_t nvs_ver)
 {
diff --git a/drivers/net/netvsc/hn_var.h b/drivers/net/netvsc/hn_var.h
index 05bc492511ec..7434ff19bfa5 100644
--- a/drivers/net/netvsc/hn_var.h
+++ b/drivers/net/netvsc/hn_var.h
@@ -97,6 +97,7 @@ struct hn_data {
 	struct rte_vmbus_device *vmbus;
 	struct hn_rx_queue *primary;
 	rte_spinlock_t  vf_lock;
+	rte_spinlock_t  nvs_lock;
 	uint16_t	port_id;
 	uint16_t	vf_port;
 
-- 
2.20.1

[dpdk-dev] [PATCH 2/2] net/netvsc: avoid mixing buffered and direct packets

[Stephen Hemminger]

Putting buffered and direct packets together into one request is
an unnecessary optimization. Better to split into two requests
(buffered and direct).

Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
---
 drivers/net/netvsc/hn_rxtx.c | 15 +++++++--------
 1 file changed, 7 insertions(+), 8 deletions(-)

diff --git a/drivers/net/netvsc/hn_rxtx.c b/drivers/net/netvsc/hn_rxtx.c
index 7212780c156e..aad3d8c04c7f 100644
--- a/drivers/net/netvsc/hn_rxtx.c
+++ b/drivers/net/netvsc/hn_rxtx.c
@@ -1362,15 +1362,14 @@ hn_xmit_pkts(void *ptxq, struct rte_mbuf **tx_pkts, uint16_t nb_pkts)
 		} else {
 			struct hn_txdesc *txd;
 
-			/* can send chimney data and large packet at once */
+			/* Send any outstanding packets in buffer */
 			txd = txq->agg_txd;
-			if (txd) {
-				hn_reset_txagg(txq);
-			} else {
-				txd = hn_new_txd(hv, txq);
-				if (unlikely(!txd))
-					break;
-			}
+			if (txd && hn_flush_txagg(txq, &need_sig))
+				goto fail;
+
+			txd = hn_new_txd(hv, txq);
+			if (unlikely(!txd))
+				break;
 
 			pkt = txd->rndis_pkt;
 			txd->m = m;
-- 
2.20.1

Re: [dpdk-dev] [PATCH 0/2] net/netvsc: patches

[Ferruh Yigit]

On 3/16/2020 11:56 PM, Stephen Hemminger wrote:
> A couple of fixes for netvsc PMD.
> The first is more serious than the second.
> 
> Stephen Hemminger (2):
>   net/netvsc: handle receive packets during multi-channel setup
>   net/netvsc: avoid mixing buffered and direct packets
> 

Series applied to dpdk-next-net/master, thanks.

Re: [dpdk-dev] [PATCH 0/2] net/netvsc: patches

[Stephen Hemminger]

On Wed, 18 Mar 2020 17:33:18 +0000
Ferruh Yigit <ferruh.yigit@intel.com> wrote:

> On 3/16/2020 11:56 PM, Stephen Hemminger wrote:
> > A couple of fixes for netvsc PMD.
> > The first is more serious than the second.
> > 
> > Stephen Hemminger (2):
> >   net/netvsc: handle receive packets during multi-channel setup
> >   net/netvsc: avoid mixing buffered and direct packets
> >   
> 
> Series applied to dpdk-next-net/master, thanks.

Could you back it out. I have v2 to send today.

Re: [dpdk-dev] [PATCH 0/2] net/netvsc: patches

[Ferruh Yigit]

On 3/18/2020 6:09 PM, Stephen Hemminger wrote:
> On Wed, 18 Mar 2020 17:33:18 +0000
> Ferruh Yigit <ferruh.yigit@intel.com> wrote:
> 
>> On 3/16/2020 11:56 PM, Stephen Hemminger wrote:
>>> A couple of fixes for netvsc PMD.
>>> The first is more serious than the second.
>>>
>>> Stephen Hemminger (2):
>>>   net/netvsc: handle receive packets during multi-channel setup
>>>   net/netvsc: avoid mixing buffered and direct packets
>>>   
>>
>> Series applied to dpdk-next-net/master, thanks.
> 
> Could you back it out. I have v2 to send today.
> 

Done, dropped from next-net.

[dpdk-dev] [PATCH v2 0/4] net/netvsc patches

[Stephen Hemminger]

These are bug fixes for netvsc PMD mostly related to issues
discovered by users of multi-queue.

v2 -- simplify the locking on multi-channel setup
      add patches to handle single queue and tx descriptor pool

Stephen Hemminger (4):
  net/netvsc: propogate descriptor limits from VF to netvsc
  net/netvsc: handle receive packets during multi-channel setup
  net/netvsc: split send buffers from transmit descriptors
  net/netvsc: don't enable RSS if only single receive queue

 drivers/net/netvsc/hn_ethdev.c |  22 ++-
 drivers/net/netvsc/hn_nvs.c    |  41 +++++-
 drivers/net/netvsc/hn_rxtx.c   | 258 ++++++++++++++++++++-------------
 drivers/net/netvsc/hn_var.h    |  10 +-
 drivers/net/netvsc/hn_vf.c     |  13 ++
 5 files changed, 231 insertions(+), 113 deletions(-)

-- 
2.20.1

[dpdk-dev] [PATCH v2 1/4] net/netvsc: propogate descriptor limits from VF to netvsc

[Stephen Hemminger]

If application cares about descriptor limits, the netvsc device
values should reflect those of the VF as well.

Fixes: dc7680e8597c ("net/netvsc: support integrated VF")
Cc: stable@dpdk.org
Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
---
 drivers/net/netvsc/hn_vf.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/drivers/net/netvsc/hn_vf.c b/drivers/net/netvsc/hn_vf.c
index 7a3734cadfa4..1261b2e2ef85 100644
--- a/drivers/net/netvsc/hn_vf.c
+++ b/drivers/net/netvsc/hn_vf.c
@@ -167,6 +167,17 @@ hn_nvs_handle_vfassoc(struct rte_eth_dev *dev,
 		hn_vf_remove(hv);
 }
 
+static void
+hn_vf_merge_desc_lim(struct rte_eth_desc_lim *lim,
+		     const struct rte_eth_desc_lim *vf_lim)
+{
+	lim->nb_max = RTE_MIN(vf_lim->nb_max, lim->nb_max);
+	lim->nb_min = RTE_MAX(vf_lim->nb_min, lim->nb_min);
+	lim->nb_align = RTE_MAX(vf_lim->nb_align, lim->nb_align);
+	lim->nb_seg_max = RTE_MIN(vf_lim->nb_seg_max, lim->nb_seg_max);
+	lim->nb_mtu_seg_max = RTE_MIN(vf_lim->nb_seg_max, lim->nb_seg_max);
+}
+
 /*
  * Merge the info from the VF and synthetic path.
  * use the default config of the VF
@@ -196,11 +207,13 @@ static int hn_vf_info_merge(struct rte_eth_dev *vf_dev,
 				      info->max_tx_queues);
 	info->tx_offload_capa &= vf_info.tx_offload_capa;
 	info->tx_queue_offload_capa &= vf_info.tx_queue_offload_capa;
+	hn_vf_merge_desc_lim(&info->tx_desc_lim, &vf_info.tx_desc_lim);
 
 	info->min_rx_bufsize = RTE_MAX(vf_info.min_rx_bufsize,
 				       info->min_rx_bufsize);
 	info->max_rx_pktlen  = RTE_MAX(vf_info.max_rx_pktlen,
 				       info->max_rx_pktlen);
+	hn_vf_merge_desc_lim(&info->rx_desc_lim, &vf_info.rx_desc_lim);
 
 	return 0;
 }
-- 
2.20.1

[dpdk-dev] [PATCH v2 2/4] net/netvsc: handle receive packets during multi-channel setup

[Stephen Hemminger]

It is possible for a packet to arrive during the configuration
process when setting up multiple queue mode. This would cause
configure to fail; fix by just ignoring receive packets while
waiting for control commands.

Use the receive ring lock to avoid possible races between
oddly behaved applications doing rx_burst and control operations
concurrently.

Fixes: 4e9c73e96e83 ("net/netvsc: add Hyper-V network device")
Cc: stable@dpdk.org
Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
---
 drivers/net/netvsc/hn_nvs.c | 41 +++++++++++++++++++++++++++++++++++--
 1 file changed, 39 insertions(+), 2 deletions(-)

diff --git a/drivers/net/netvsc/hn_nvs.c b/drivers/net/netvsc/hn_nvs.c
index 6b518685ab6f..477202b2a0b7 100644
--- a/drivers/net/netvsc/hn_nvs.c
+++ b/drivers/net/netvsc/hn_nvs.c
@@ -54,7 +54,7 @@ static int hn_nvs_req_send(struct hn_data *hv,
 }
 
 static int
-hn_nvs_execute(struct hn_data *hv,
+__hn_nvs_execute(struct hn_data *hv,
 	       void *req, uint32_t reqlen,
 	       void *resp, uint32_t resplen,
 	       uint32_t type)
@@ -62,6 +62,7 @@ hn_nvs_execute(struct hn_data *hv,
 	struct vmbus_channel *chan = hn_primary_chan(hv);
 	char buffer[NVS_RESPSIZE_MAX];
 	const struct hn_nvs_hdr *hdr;
+	uint64_t xactid;
 	uint32_t len;
 	int ret;
 
@@ -77,7 +78,7 @@ hn_nvs_execute(struct hn_data *hv,
 
  retry:
 	len = sizeof(buffer);
-	ret = rte_vmbus_chan_recv(chan, buffer, &len, NULL);
+	ret = rte_vmbus_chan_recv(chan, buffer, &len, &xactid);
 	if (ret == -EAGAIN) {
 		rte_delay_us(HN_CHAN_INTERVAL_US);
 		goto retry;
@@ -88,7 +89,20 @@ hn_nvs_execute(struct hn_data *hv,
 		return ret;
 	}
 
+	if (len < sizeof(*hdr)) {
+		PMD_DRV_LOG(ERR, "response missing NVS header");
+		return -EINVAL;
+	}
+
 	hdr = (struct hn_nvs_hdr *)buffer;
+
+	/* Silently drop received packets while waiting for response */
+	if (hdr->type == NVS_TYPE_RNDIS) {
+		hn_nvs_ack_rxbuf(chan, xactid);
+		--hv->rxbuf_outstanding;
+		goto retry;
+	}
+
 	if (hdr->type != type) {
 		PMD_DRV_LOG(ERR, "unexpected NVS resp %#x, expect %#x",
 			    hdr->type, type);
@@ -108,6 +122,29 @@ hn_nvs_execute(struct hn_data *hv,
 	return 0;
 }
 
+
+/*
+ * Execute one control command and get the response.
+ * Only one command can be active on a channel at once
+ * Unlike BSD, DPDK does not have an interrupt context
+ * so the polling is required to wait for response.
+ */
+static int
+hn_nvs_execute(struct hn_data *hv,
+	       void *req, uint32_t reqlen,
+	       void *resp, uint32_t resplen,
+	       uint32_t type)
+{
+	struct hn_rx_queue *rxq = hv->primary;
+	int ret;
+
+	rte_spinlock_lock(&rxq->ring_lock);
+	ret = __hn_nvs_execute(hv, req, reqlen, resp, resplen, type);
+	rte_spinlock_unlock(&rxq->ring_lock);
+
+	return ret;
+}
+
 static int
 hn_nvs_doinit(struct hn_data *hv, uint32_t nvs_ver)
 {
-- 
2.20.1

[dpdk-dev] [PATCH v2 3/4] net/netvsc: split send buffers from transmit descriptors

[Stephen Hemminger]

The VMBus has reserved transmit area (per device) and transmit descriptors
(per queue). The previous code was always having a 1:1 mapping between
send buffers and descriptors. This can lead to one queue starving another
and also buffer bloat.

Change to working more like FreeBSD where there is a pool of transmit
descriptors per queue. If send buffer is not available then no aggregation
happens but the queue can still drain.

Fixes: 4e9c73e96e83 ("net/netvsc: add Hyper-V network device")
Cc: stable@dpdk.org
Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
---
 drivers/net/netvsc/hn_ethdev.c |   9 +-
 drivers/net/netvsc/hn_rxtx.c   | 258 ++++++++++++++++++++-------------
 drivers/net/netvsc/hn_var.h    |  10 +-
 3 files changed, 171 insertions(+), 106 deletions(-)

diff --git a/drivers/net/netvsc/hn_ethdev.c b/drivers/net/netvsc/hn_ethdev.c
index 564620748daf..ac6610838008 100644
--- a/drivers/net/netvsc/hn_ethdev.c
+++ b/drivers/net/netvsc/hn_ethdev.c
@@ -257,6 +257,9 @@ static int hn_dev_info_get(struct rte_eth_dev *dev,
 	dev_info->max_rx_queues = hv->max_queues;
 	dev_info->max_tx_queues = hv->max_queues;
 
+	dev_info->tx_desc_lim.nb_min = 1;
+	dev_info->tx_desc_lim.nb_max = 4096;
+
 	if (rte_eal_process_type() != RTE_PROC_PRIMARY)
 		return 0;
 
@@ -982,7 +985,7 @@ eth_hn_dev_init(struct rte_eth_dev *eth_dev)
 	if  (err)
 		goto failed;
 
-	err = hn_tx_pool_init(eth_dev);
+	err = hn_chim_init(eth_dev);
 	if (err)
 		goto failed;
 
@@ -1018,7 +1021,7 @@ eth_hn_dev_init(struct rte_eth_dev *eth_dev)
 failed:
 	PMD_INIT_LOG(NOTICE, "device init failed");
 
-	hn_tx_pool_uninit(eth_dev);
+	hn_chim_uninit(eth_dev);
 	hn_detach(hv);
 	return err;
 }
@@ -1042,7 +1045,7 @@ eth_hn_dev_uninit(struct rte_eth_dev *eth_dev)
 	eth_dev->rx_pkt_burst = NULL;
 
 	hn_detach(hv);
-	hn_tx_pool_uninit(eth_dev);
+	hn_chim_uninit(eth_dev);
 	rte_vmbus_chan_close(hv->primary->chan);
 	rte_free(hv->primary);
 	ret = rte_eth_dev_owner_delete(hv->owner.id);
diff --git a/drivers/net/netvsc/hn_rxtx.c b/drivers/net/netvsc/hn_rxtx.c
index 7212780c156e..f3ce5084eceb 100644
--- a/drivers/net/netvsc/hn_rxtx.c
+++ b/drivers/net/netvsc/hn_rxtx.c
@@ -18,6 +18,7 @@
 #include <rte_memzone.h>
 #include <rte_malloc.h>
 #include <rte_atomic.h>
+#include <rte_bitmap.h>
 #include <rte_branch_prediction.h>
 #include <rte_ether.h>
 #include <rte_common.h>
@@ -83,7 +84,7 @@ struct hn_txdesc {
 	struct rte_mbuf *m;
 
 	uint16_t	queue_id;
-	uint16_t	chim_index;
+	uint32_t	chim_index;
 	uint32_t	chim_size;
 	uint32_t	data_size;
 	uint32_t	packets;
@@ -98,6 +99,8 @@ struct hn_txdesc {
 	 RNDIS_PKTINFO_SIZE(NDIS_LSO2_INFO_SIZE) +	\
 	 RNDIS_PKTINFO_SIZE(NDIS_TXCSUM_INFO_SIZE))
 
+#define HN_RNDIS_PKT_ALIGNED	RTE_ALIGN(HN_RNDIS_PKT_LEN, RTE_CACHE_LINE_SIZE)
+
 /* Minimum space required for a packet */
 #define HN_PKTSIZE_MIN(align) \
 	RTE_ALIGN(RTE_ETHER_MIN_LEN + HN_RNDIS_PKT_LEN, align)
@@ -150,63 +153,78 @@ hn_rndis_pktmsg_offset(uint32_t ofs)
 static void hn_txd_init(struct rte_mempool *mp __rte_unused,
 			void *opaque, void *obj, unsigned int idx)
 {
+	struct hn_tx_queue *txq = opaque;
 	struct hn_txdesc *txd = obj;
-	struct rte_eth_dev *dev = opaque;
-	struct rndis_packet_msg *pkt;
 
 	memset(txd, 0, sizeof(*txd));
-	txd->chim_index = idx;
-
-	pkt = rte_malloc_socket("RNDIS_TX", HN_RNDIS_PKT_LEN,
-				rte_align32pow2(HN_RNDIS_PKT_LEN),
-				dev->device->numa_node);
-	if (!pkt)
-		rte_exit(EXIT_FAILURE, "can not allocate RNDIS header");
 
-	txd->rndis_pkt = pkt;
+	txd->queue_id = txq->queue_id;
+	txd->chim_index = NVS_CHIM_IDX_INVALID;
+	txd->rndis_pkt = (struct rndis_packet_msg *)(char *)txq->tx_rndis
+		+ idx * HN_RNDIS_PKT_ALIGNED;
 }
 
-/*
- * Unlike Linux and FreeBSD, this driver uses a mempool
- * to limit outstanding transmits and reserve buffers
- */
 int
-hn_tx_pool_init(struct rte_eth_dev *dev)
+hn_chim_init(struct rte_eth_dev *dev)
 {
 	struct hn_data *hv = dev->data->dev_private;
-	char name[RTE_MEMPOOL_NAMESIZE];
-	struct rte_mempool *mp;
+	uint32_t i, chim_bmp_size;
 
-	snprintf(name, sizeof(name),
-		 "hn_txd_%u", dev->data->port_id);
-
-	PMD_INIT_LOG(DEBUG, "create a TX send pool %s n=%u size=%zu socket=%d",
-		     name, hv->chim_cnt, sizeof(struct hn_txdesc),
-		     dev->device->numa_node);
-
-	mp = rte_mempool_create(name, hv->chim_cnt, sizeof(struct hn_txdesc),
-				HN_TXD_CACHE_SIZE, 0,
-				NULL, NULL,
-				hn_txd_init, dev,
-				dev->device->numa_node, 0);
-	if (!mp) {
-		PMD_DRV_LOG(ERR,
-			    "mempool %s create failed: %d", name, rte_errno);
-		return -rte_errno;
+	rte_spinlock_init(&hv->chim_lock);
+	chim_bmp_size = rte_bitmap_get_memory_footprint(hv->chim_cnt);
+	hv->chim_bmem = rte_zmalloc("hn_chim_bitmap", chim_bmp_size,
+				    RTE_CACHE_LINE_SIZE);
+	if (hv->chim_bmem == NULL) {
+		PMD_INIT_LOG(ERR, "failed to allocate bitmap size %u", chim_bmp_size);
+		return -1;
+
+	}
+
+	PMD_INIT_LOG(DEBUG, "create a TX bitmap n=%u size=%u", hv->chim_cnt, chim_bmp_size);
+
+	hv->chim_bmap = rte_bitmap_init(hv->chim_cnt, hv->chim_bmem, chim_bmp_size);
+	if (hv->chim_bmap == NULL) {
+		PMD_INIT_LOG(ERR, "failed to init chim bitmap");
+		return -1;
 	}
 
-	hv->tx_pool = mp;
+	for (i = 0; i < hv->chim_cnt; i++)
+		rte_bitmap_set(hv->chim_bmap, i);
+
 	return 0;
 }
 
 void
-hn_tx_pool_uninit(struct rte_eth_dev *dev)
+hn_chim_uninit(struct rte_eth_dev *dev)
 {
 	struct hn_data *hv = dev->data->dev_private;
 
-	if (hv->tx_pool) {
-		rte_mempool_free(hv->tx_pool);
-		hv->tx_pool = NULL;
+	rte_bitmap_free(hv->chim_bmap);
+	rte_free(hv->chim_bmem);
+	hv->chim_bmem = NULL;
+}
+
+static uint32_t hn_chim_alloc(struct hn_data *hv)
+{
+	uint32_t index = NVS_CHIM_IDX_INVALID;
+	uint64_t slab;
+
+	rte_spinlock_lock(&hv->chim_lock);
+	if (rte_bitmap_scan(hv->chim_bmap, &index, &slab))
+		rte_bitmap_clear(hv->chim_bmap, index);
+	rte_spinlock_unlock(&hv->chim_lock);
+
+	return index;
+}
+
+static void hn_chim_free(struct hn_data *hv, uint32_t chim_idx)
+{
+	if (chim_idx >= hv->chim_cnt) {
+		PMD_DRV_LOG(ERR, "Invalid chimney index %u", chim_idx);
+	} else {
+		rte_spinlock_lock(&hv->chim_lock);
+		rte_bitmap_set(hv->chim_bmap, chim_idx);
+		rte_spinlock_unlock(&hv->chim_lock);
 	}
 }
 
@@ -220,15 +238,16 @@ static void hn_reset_txagg(struct hn_tx_queue *txq)
 
 int
 hn_dev_tx_queue_setup(struct rte_eth_dev *dev,
-		      uint16_t queue_idx, uint16_t nb_desc __rte_unused,
+		      uint16_t queue_idx, uint16_t nb_desc,
 		      unsigned int socket_id,
 		      const struct rte_eth_txconf *tx_conf)
 
 {
 	struct hn_data *hv = dev->data->dev_private;
 	struct hn_tx_queue *txq;
+	char name[RTE_MEMPOOL_NAMESIZE];
 	uint32_t tx_free_thresh;
-	int err;
+	int err = -ENOMEM;
 
 	PMD_INIT_FUNC_TRACE();
 
@@ -252,6 +271,28 @@ hn_dev_tx_queue_setup(struct rte_eth_dev *dev,
 
 	txq->free_thresh = tx_free_thresh;
 
+	snprintf(name, sizeof(name),
+		 "hn_txd_%u_%u", dev->data->port_id, queue_idx);
+
+	PMD_INIT_LOG(DEBUG, "TX descriptor pool %s n=%u size=%zu",
+		     name, nb_desc, sizeof(struct hn_txdesc));
+
+	txq->tx_rndis = rte_calloc("hn_txq_rndis", nb_desc, HN_RNDIS_PKT_ALIGNED,
+				RTE_CACHE_LINE_SIZE);
+	if (txq->tx_rndis == NULL)
+		goto error;
+
+	txq->txdesc_pool = rte_mempool_create(name, nb_desc, sizeof(struct hn_txdesc),
+					      0, 0,
+					      NULL, NULL,
+					      hn_txd_init, txq,
+					      dev->device->numa_node, 0);
+	if (txq->txdesc_pool == NULL) {
+		PMD_DRV_LOG(ERR,
+			    "mempool %s create failed: %d", name, rte_errno);
+		goto error;
+	}
+
 	txq->agg_szmax  = RTE_MIN(hv->chim_szmax, hv->rndis_agg_size);
 	txq->agg_pktmax = hv->rndis_agg_pkts;
 	txq->agg_align  = hv->rndis_agg_align;
@@ -260,31 +301,57 @@ hn_dev_tx_queue_setup(struct rte_eth_dev *dev,
 
 	err = hn_vf_tx_queue_setup(dev, queue_idx, nb_desc,
 				     socket_id, tx_conf);
-	if (err) {
-		rte_free(txq);
-		return err;
+	if (err == 0) {
+		dev->data->tx_queues[queue_idx] = txq;
+		return 0;
 	}
 
-	dev->data->tx_queues[queue_idx] = txq;
-	return 0;
+error:
+	if (txq->txdesc_pool)
+		rte_mempool_free(txq->txdesc_pool);
+	rte_free(txq->tx_rndis);
+	rte_free(txq);
+	return err;
+}
+
+
+static struct hn_txdesc *hn_txd_get(struct hn_tx_queue *txq)
+{
+	struct hn_txdesc *txd;
+
+	if (rte_mempool_get(txq->txdesc_pool, (void **)&txd)) {
+		++txq->stats.ring_full;
+		PMD_TX_LOG(DEBUG, "tx pool exhausted!");
+		return NULL;
+	}
+
+	txd->m = NULL;
+	txd->packets = 0;
+	txd->data_size = 0;
+	txd->chim_size = 0;
+
+	return txd;
+}
+
+static void hn_txd_put(struct hn_tx_queue *txq, struct hn_txdesc *txd)
+{
+	rte_mempool_put(txq->txdesc_pool, txd);
 }
 
 void
 hn_dev_tx_queue_release(void *arg)
 {
 	struct hn_tx_queue *txq = arg;
-	struct hn_txdesc *txd;
 
 	PMD_INIT_FUNC_TRACE();
 
 	if (!txq)
 		return;
 
-	/* If any pending data is still present just drop it */
-	txd = txq->agg_txd;
-	if (txd)
-		rte_mempool_put(txq->hv->tx_pool, txd);
+	if (txq->txdesc_pool)
+		rte_mempool_free(txq->txdesc_pool);
 
+	rte_free(txq->tx_rndis);
 	rte_free(txq);
 }
 
@@ -292,6 +359,7 @@ static void
 hn_nvs_send_completed(struct rte_eth_dev *dev, uint16_t queue_id,
 		      unsigned long xactid, const struct hn_nvs_rndis_ack *ack)
 {
+	struct hn_data *hv = dev->data->dev_private;
 	struct hn_txdesc *txd = (struct hn_txdesc *)xactid;
 	struct hn_tx_queue *txq;
 
@@ -312,9 +380,11 @@ hn_nvs_send_completed(struct rte_eth_dev *dev, uint16_t queue_id,
 		++txq->stats.errors;
 	}
 
-	rte_pktmbuf_free(txd->m);
+	if (txd->chim_index != NVS_CHIM_IDX_INVALID)
+		hn_chim_free(hv, txd->chim_index);
 
-	rte_mempool_put(txq->hv->tx_pool, txd);
+	rte_pktmbuf_free(txd->m);
+	hn_txd_put(txq, txd);
 }
 
 /* Handle transmit completion events */
@@ -1036,28 +1106,15 @@ static int hn_flush_txagg(struct hn_tx_queue *txq, bool *need_sig)
 	return ret;
 }
 
-static struct hn_txdesc *hn_new_txd(struct hn_data *hv,
-				    struct hn_tx_queue *txq)
-{
-	struct hn_txdesc *txd;
-
-	if (rte_mempool_get(hv->tx_pool, (void **)&txd)) {
-		++txq->stats.ring_full;
-		PMD_TX_LOG(DEBUG, "tx pool exhausted!");
-		return NULL;
-	}
-
-	txd->m = NULL;
-	txd->queue_id = txq->queue_id;
-	txd->packets = 0;
-	txd->data_size = 0;
-	txd->chim_size = 0;
-
-	return txd;
-}
-
+/*
+ * Try and find a place in a send chimney buffer to put
+ * the small packet. If space is available, this routine
+ * returns a pointer of where to place the data.
+ * If no space, caller should try direct transmit.
+ */
 static void *
-hn_try_txagg(struct hn_data *hv, struct hn_tx_queue *txq, uint32_t pktsize)
+hn_try_txagg(struct hn_data *hv, struct hn_tx_queue *txq,
+	     struct hn_txdesc *txd, uint32_t pktsize)
 {
 	struct hn_txdesc *agg_txd = txq->agg_txd;
 	struct rndis_packet_msg *pkt;
@@ -1085,7 +1142,7 @@ hn_try_txagg(struct hn_data *hv, struct hn_tx_queue *txq, uint32_t pktsize)
 		}
 
 		chim = (uint8_t *)pkt + pkt->len;
-
+		txq->agg_prevpkt = chim;
 		txq->agg_pktleft--;
 		txq->agg_szleft -= pktsize;
 		if (txq->agg_szleft < HN_PKTSIZE_MIN(txq->agg_align)) {
@@ -1095,18 +1152,21 @@ hn_try_txagg(struct hn_data *hv, struct hn_tx_queue *txq, uint32_t pktsize)
 			 */
 			txq->agg_pktleft = 0;
 		}
-	} else {
-		agg_txd = hn_new_txd(hv, txq);
-		if (!agg_txd)
-			return NULL;
-
-		chim = (uint8_t *)hv->chim_res->addr
-			+ agg_txd->chim_index * hv->chim_szmax;
 
-		txq->agg_txd = agg_txd;
-		txq->agg_pktleft = txq->agg_pktmax - 1;
-		txq->agg_szleft = txq->agg_szmax - pktsize;
+		hn_txd_put(txq, txd);
+		return chim;
 	}
+
+	txd->chim_index = hn_chim_alloc(hv);
+	if (txd->chim_index == NVS_CHIM_IDX_INVALID)
+		return NULL;
+
+	chim = (uint8_t *)hv->chim_res->addr
+			+ txd->chim_index * hv->chim_szmax;
+
+	txq->agg_txd = txd;
+	txq->agg_pktleft = txq->agg_pktmax - 1;
+	txq->agg_szleft = txq->agg_szmax - pktsize;
 	txq->agg_prevpkt = chim;
 
 	return chim;
@@ -1329,13 +1389,18 @@ hn_xmit_pkts(void *ptxq, struct rte_mbuf **tx_pkts, uint16_t nb_pkts)
 		return (*vf_dev->tx_pkt_burst)(sub_q, tx_pkts, nb_pkts);
 	}
 
-	if (rte_mempool_avail_count(hv->tx_pool) <= txq->free_thresh)
+	if (rte_mempool_avail_count(txq->txdesc_pool) <= txq->free_thresh)
 		hn_process_events(hv, txq->queue_id, 0);
 
 	for (nb_tx = 0; nb_tx < nb_pkts; nb_tx++) {
 		struct rte_mbuf *m = tx_pkts[nb_tx];
 		uint32_t pkt_size = m->pkt_len + HN_RNDIS_PKT_LEN;
 		struct rndis_packet_msg *pkt;
+		struct hn_txdesc *txd;
+
+		txd = hn_txd_get(txq);
+		if (txd == NULL)
+			break;
 
 		/* For small packets aggregate them in chimney buffer */
 		if (m->pkt_len < HN_TXCOPY_THRESHOLD && pkt_size <= txq->agg_szmax) {
@@ -1346,7 +1411,8 @@ hn_xmit_pkts(void *ptxq, struct rte_mbuf **tx_pkts, uint16_t nb_pkts)
 					goto fail;
 			}
 
-			pkt = hn_try_txagg(hv, txq, pkt_size);
+
+			pkt = hn_try_txagg(hv, txq, txd, pkt_size);
 			if (unlikely(!pkt))
 				break;
 
@@ -1360,21 +1426,13 @@ hn_xmit_pkts(void *ptxq, struct rte_mbuf **tx_pkts, uint16_t nb_pkts)
 			    hn_flush_txagg(txq, &need_sig))
 				goto fail;
 		} else {
-			struct hn_txdesc *txd;
-
-			/* can send chimney data and large packet at once */
-			txd = txq->agg_txd;
-			if (txd) {
-				hn_reset_txagg(txq);
-			} else {
-				txd = hn_new_txd(hv, txq);
-				if (unlikely(!txd))
-					break;
-			}
+			/* Send any outstanding packets in buffer */
+			if (txq->agg_txd && hn_flush_txagg(txq, &need_sig))
+				goto fail;
 
 			pkt = txd->rndis_pkt;
 			txd->m = m;
-			txd->data_size += m->pkt_len;
+			txd->data_size = m->pkt_len;
 			++txd->packets;
 
 			hn_encap(pkt, queue_id, m);
@@ -1383,7 +1441,7 @@ hn_xmit_pkts(void *ptxq, struct rte_mbuf **tx_pkts, uint16_t nb_pkts)
 			if (unlikely(ret != 0)) {
 				PMD_TX_LOG(NOTICE, "sg send failed: %d", ret);
 				++txq->stats.errors;
-				rte_mempool_put(hv->tx_pool, txd);
+				hn_txd_put(txq, txd);
 				goto fail;
 			}
 		}
diff --git a/drivers/net/netvsc/hn_var.h b/drivers/net/netvsc/hn_var.h
index 05bc492511ec..bd8aeada76ee 100644
--- a/drivers/net/netvsc/hn_var.h
+++ b/drivers/net/netvsc/hn_var.h
@@ -52,6 +52,8 @@ struct hn_tx_queue {
 	uint16_t	port_id;
 	uint16_t	queue_id;
 	uint32_t	free_thresh;
+	struct rte_mempool *txdesc_pool;
+	void 		*tx_rndis;
 
 	/* Applied packet transmission aggregation limits. */
 	uint32_t	agg_szmax;
@@ -115,8 +117,10 @@ struct hn_data {
 	uint16_t	num_queues;
 	uint64_t	rss_offloads;
 
+	rte_spinlock_t	chim_lock;
 	struct rte_mem_resource *chim_res;	/* UIO resource for Tx */
-	struct rte_mempool *tx_pool;		/* Tx descriptors */
+	struct rte_bitmap *chim_bmap;		/* Send buffer map */
+	void		*chim_bmem;
 	uint32_t	chim_szmax;		/* Max size per buffer */
 	uint32_t	chim_cnt;		/* Max packets per buffer */
 
@@ -157,8 +161,8 @@ uint16_t hn_xmit_pkts(void *tx_queue, struct rte_mbuf **tx_pkts,
 uint16_t hn_recv_pkts(void *rx_queue, struct rte_mbuf **rx_pkts,
 		      uint16_t nb_pkts);
 
-int	hn_tx_pool_init(struct rte_eth_dev *dev);
-void	hn_tx_pool_uninit(struct rte_eth_dev *dev);
+int	hn_chim_init(struct rte_eth_dev *dev);
+void	hn_chim_uninit(struct rte_eth_dev *dev);
 int	hn_dev_link_update(struct rte_eth_dev *dev, int wait);
 int	hn_dev_tx_queue_setup(struct rte_eth_dev *dev, uint16_t queue_idx,
 			      uint16_t nb_desc, unsigned int socket_id,
-- 
2.20.1

[dpdk-dev] [PATCH v2 4/4] net/netvsc: don't enable RSS if only single receive queue

[Stephen Hemminger]

If application has multiple transmit queues but only a single
receive queue, then do not enable RSS.

Fixes: 8b945a7f7dcb ("drivers/net: update Rx RSS hash offload capabilities")
Cc: stable@dpdk.org
Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
---
 drivers/net/netvsc/hn_ethdev.c | 13 ++++++++-----
 1 file changed, 8 insertions(+), 5 deletions(-)

diff --git a/drivers/net/netvsc/hn_ethdev.c b/drivers/net/netvsc/hn_ethdev.c
index ac6610838008..85f43996a623 100644
--- a/drivers/net/netvsc/hn_ethdev.c
+++ b/drivers/net/netvsc/hn_ethdev.c
@@ -597,11 +597,14 @@ static int hn_dev_configure(struct rte_eth_dev *dev)
 			return err;
 		}
 
-		err = hn_rndis_conf_rss(hv, 0);
-		if (err) {
-			PMD_DRV_LOG(NOTICE,
-				    "initial RSS config failed");
-			return err;
+		if ((dev_conf->rxmode.offloads & DEV_RX_OFFLOAD_RSS_HASH) &&
+		    dev->data->nb_rx_queues > 1) {
+			err = hn_rndis_conf_rss(hv, 0);
+			if (err) {
+				PMD_DRV_LOG(NOTICE,
+					    "initial RSS config failed");
+				return err;
+			}
 		}
 	}
 
-- 
2.20.1

[dpdk-dev] [PATCH v3 0/4] net/netvsc patches

[Stephen Hemminger]

These are bug fixes for netvsc PMD mostly related to issues
discovered by users of multi-queue.

v3 - fix checkpatch complaints
v2 - simplify the locking on multi-channel setup
      add patches to handle single queue and tx descriptor pool

Stephen Hemminger (4):
  net/netvsc: propagate descriptor limits from VF to netvsc
  net/netvsc: handle receive packets during multi-channel setup
  net/netvsc: split send buffers from transmit descriptors
  net/netvsc: don't enable RSS if only single receive queue

 drivers/net/netvsc/hn_ethdev.c |  22 ++-
 drivers/net/netvsc/hn_nvs.c    |  41 +++++-
 drivers/net/netvsc/hn_rxtx.c   | 261 ++++++++++++++++++++-------------
 drivers/net/netvsc/hn_var.h    |  10 +-
 drivers/net/netvsc/hn_vf.c     |  13 ++
 5 files changed, 234 insertions(+), 113 deletions(-)

-- 
2.20.1

[dpdk-dev] [PATCH v3 1/4] net/netvsc: propagate descriptor limits from VF to netvsc

[Stephen Hemminger]

If application cares about descriptor limits, the netvsc device
values should reflect those of the VF as well.

Fixes: dc7680e8597c ("net/netvsc: support integrated VF")
Cc: stable@dpdk.org
Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
---
 drivers/net/netvsc/hn_vf.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/drivers/net/netvsc/hn_vf.c b/drivers/net/netvsc/hn_vf.c
index 7a3734cadfa4..1261b2e2ef85 100644
--- a/drivers/net/netvsc/hn_vf.c
+++ b/drivers/net/netvsc/hn_vf.c
@@ -167,6 +167,17 @@ hn_nvs_handle_vfassoc(struct rte_eth_dev *dev,
 		hn_vf_remove(hv);
 }
 
+static void
+hn_vf_merge_desc_lim(struct rte_eth_desc_lim *lim,
+		     const struct rte_eth_desc_lim *vf_lim)
+{
+	lim->nb_max = RTE_MIN(vf_lim->nb_max, lim->nb_max);
+	lim->nb_min = RTE_MAX(vf_lim->nb_min, lim->nb_min);
+	lim->nb_align = RTE_MAX(vf_lim->nb_align, lim->nb_align);
+	lim->nb_seg_max = RTE_MIN(vf_lim->nb_seg_max, lim->nb_seg_max);
+	lim->nb_mtu_seg_max = RTE_MIN(vf_lim->nb_seg_max, lim->nb_seg_max);
+}
+
 /*
  * Merge the info from the VF and synthetic path.
  * use the default config of the VF
@@ -196,11 +207,13 @@ static int hn_vf_info_merge(struct rte_eth_dev *vf_dev,
 				      info->max_tx_queues);
 	info->tx_offload_capa &= vf_info.tx_offload_capa;
 	info->tx_queue_offload_capa &= vf_info.tx_queue_offload_capa;
+	hn_vf_merge_desc_lim(&info->tx_desc_lim, &vf_info.tx_desc_lim);
 
 	info->min_rx_bufsize = RTE_MAX(vf_info.min_rx_bufsize,
 				       info->min_rx_bufsize);
 	info->max_rx_pktlen  = RTE_MAX(vf_info.max_rx_pktlen,
 				       info->max_rx_pktlen);
+	hn_vf_merge_desc_lim(&info->rx_desc_lim, &vf_info.rx_desc_lim);
 
 	return 0;
 }
-- 
2.20.1

[dpdk-dev] [PATCH v3 2/4] net/netvsc: handle receive packets during multi-channel setup

[Stephen Hemminger]

It is possible for a packet to arrive during the configuration
process when setting up multiple queue mode. This would cause
configure to fail; fix by just ignoring receive packets while
waiting for control commands.

Use the receive ring lock to avoid possible races between
oddly behaved applications doing rx_burst and control operations
concurrently.

Fixes: 4e9c73e96e83 ("net/netvsc: add Hyper-V network device")
Cc: stable@dpdk.org
Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
---
 drivers/net/netvsc/hn_nvs.c | 41 +++++++++++++++++++++++++++++++++++--
 1 file changed, 39 insertions(+), 2 deletions(-)

diff --git a/drivers/net/netvsc/hn_nvs.c b/drivers/net/netvsc/hn_nvs.c
index 6b518685ab6f..477202b2a0b7 100644
--- a/drivers/net/netvsc/hn_nvs.c
+++ b/drivers/net/netvsc/hn_nvs.c
@@ -54,7 +54,7 @@ static int hn_nvs_req_send(struct hn_data *hv,
 }
 
 static int
-hn_nvs_execute(struct hn_data *hv,
+__hn_nvs_execute(struct hn_data *hv,
 	       void *req, uint32_t reqlen,
 	       void *resp, uint32_t resplen,
 	       uint32_t type)
@@ -62,6 +62,7 @@ hn_nvs_execute(struct hn_data *hv,
 	struct vmbus_channel *chan = hn_primary_chan(hv);
 	char buffer[NVS_RESPSIZE_MAX];
 	const struct hn_nvs_hdr *hdr;
+	uint64_t xactid;
 	uint32_t len;
 	int ret;
 
@@ -77,7 +78,7 @@ hn_nvs_execute(struct hn_data *hv,
 
  retry:
 	len = sizeof(buffer);
-	ret = rte_vmbus_chan_recv(chan, buffer, &len, NULL);
+	ret = rte_vmbus_chan_recv(chan, buffer, &len, &xactid);
 	if (ret == -EAGAIN) {
 		rte_delay_us(HN_CHAN_INTERVAL_US);
 		goto retry;
@@ -88,7 +89,20 @@ hn_nvs_execute(struct hn_data *hv,
 		return ret;
 	}
 
+	if (len < sizeof(*hdr)) {
+		PMD_DRV_LOG(ERR, "response missing NVS header");
+		return -EINVAL;
+	}
+
 	hdr = (struct hn_nvs_hdr *)buffer;
+
+	/* Silently drop received packets while waiting for response */
+	if (hdr->type == NVS_TYPE_RNDIS) {
+		hn_nvs_ack_rxbuf(chan, xactid);
+		--hv->rxbuf_outstanding;
+		goto retry;
+	}
+
 	if (hdr->type != type) {
 		PMD_DRV_LOG(ERR, "unexpected NVS resp %#x, expect %#x",
 			    hdr->type, type);
@@ -108,6 +122,29 @@ hn_nvs_execute(struct hn_data *hv,
 	return 0;
 }
 
+
+/*
+ * Execute one control command and get the response.
+ * Only one command can be active on a channel at once
+ * Unlike BSD, DPDK does not have an interrupt context
+ * so the polling is required to wait for response.
+ */
+static int
+hn_nvs_execute(struct hn_data *hv,
+	       void *req, uint32_t reqlen,
+	       void *resp, uint32_t resplen,
+	       uint32_t type)
+{
+	struct hn_rx_queue *rxq = hv->primary;
+	int ret;
+
+	rte_spinlock_lock(&rxq->ring_lock);
+	ret = __hn_nvs_execute(hv, req, reqlen, resp, resplen, type);
+	rte_spinlock_unlock(&rxq->ring_lock);
+
+	return ret;
+}
+
 static int
 hn_nvs_doinit(struct hn_data *hv, uint32_t nvs_ver)
 {
-- 
2.20.1

[dpdk-dev] [PATCH v3 3/4] net/netvsc: split send buffers from transmit descriptors

[Stephen Hemminger]

The VMBus has reserved transmit area (per device) and transmit descriptors
(per queue). The previous code was always having a 1:1 mapping between
send buffers and descriptors. This can lead to one queue starving another
and also buffer bloat.

Change to working more like FreeBSD where there is a pool of transmit
descriptors per queue. If send buffer is not available then no aggregation
happens but the queue can still drain.

Fixes: 4e9c73e96e83 ("net/netvsc: add Hyper-V network device")
Cc: stable@dpdk.org
Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
---
 drivers/net/netvsc/hn_ethdev.c |   9 +-
 drivers/net/netvsc/hn_rxtx.c   | 261 ++++++++++++++++++++-------------
 drivers/net/netvsc/hn_var.h    |  10 +-
 3 files changed, 174 insertions(+), 106 deletions(-)

diff --git a/drivers/net/netvsc/hn_ethdev.c b/drivers/net/netvsc/hn_ethdev.c
index 564620748daf..ac6610838008 100644
--- a/drivers/net/netvsc/hn_ethdev.c
+++ b/drivers/net/netvsc/hn_ethdev.c
@@ -257,6 +257,9 @@ static int hn_dev_info_get(struct rte_eth_dev *dev,
 	dev_info->max_rx_queues = hv->max_queues;
 	dev_info->max_tx_queues = hv->max_queues;
 
+	dev_info->tx_desc_lim.nb_min = 1;
+	dev_info->tx_desc_lim.nb_max = 4096;
+
 	if (rte_eal_process_type() != RTE_PROC_PRIMARY)
 		return 0;
 
@@ -982,7 +985,7 @@ eth_hn_dev_init(struct rte_eth_dev *eth_dev)
 	if  (err)
 		goto failed;
 
-	err = hn_tx_pool_init(eth_dev);
+	err = hn_chim_init(eth_dev);
 	if (err)
 		goto failed;
 
@@ -1018,7 +1021,7 @@ eth_hn_dev_init(struct rte_eth_dev *eth_dev)
 failed:
 	PMD_INIT_LOG(NOTICE, "device init failed");
 
-	hn_tx_pool_uninit(eth_dev);
+	hn_chim_uninit(eth_dev);
 	hn_detach(hv);
 	return err;
 }
@@ -1042,7 +1045,7 @@ eth_hn_dev_uninit(struct rte_eth_dev *eth_dev)
 	eth_dev->rx_pkt_burst = NULL;
 
 	hn_detach(hv);
-	hn_tx_pool_uninit(eth_dev);
+	hn_chim_uninit(eth_dev);
 	rte_vmbus_chan_close(hv->primary->chan);
 	rte_free(hv->primary);
 	ret = rte_eth_dev_owner_delete(hv->owner.id);
diff --git a/drivers/net/netvsc/hn_rxtx.c b/drivers/net/netvsc/hn_rxtx.c
index 7212780c156e..eea09a431ec6 100644
--- a/drivers/net/netvsc/hn_rxtx.c
+++ b/drivers/net/netvsc/hn_rxtx.c
@@ -18,6 +18,7 @@
 #include <rte_memzone.h>
 #include <rte_malloc.h>
 #include <rte_atomic.h>
+#include <rte_bitmap.h>
 #include <rte_branch_prediction.h>
 #include <rte_ether.h>
 #include <rte_common.h>
@@ -83,7 +84,7 @@ struct hn_txdesc {
 	struct rte_mbuf *m;
 
 	uint16_t	queue_id;
-	uint16_t	chim_index;
+	uint32_t	chim_index;
 	uint32_t	chim_size;
 	uint32_t	data_size;
 	uint32_t	packets;
@@ -98,6 +99,8 @@ struct hn_txdesc {
 	 RNDIS_PKTINFO_SIZE(NDIS_LSO2_INFO_SIZE) +	\
 	 RNDIS_PKTINFO_SIZE(NDIS_TXCSUM_INFO_SIZE))
 
+#define HN_RNDIS_PKT_ALIGNED	RTE_ALIGN(HN_RNDIS_PKT_LEN, RTE_CACHE_LINE_SIZE)
+
 /* Minimum space required for a packet */
 #define HN_PKTSIZE_MIN(align) \
 	RTE_ALIGN(RTE_ETHER_MIN_LEN + HN_RNDIS_PKT_LEN, align)
@@ -150,63 +153,80 @@ hn_rndis_pktmsg_offset(uint32_t ofs)
 static void hn_txd_init(struct rte_mempool *mp __rte_unused,
 			void *opaque, void *obj, unsigned int idx)
 {
+	struct hn_tx_queue *txq = opaque;
 	struct hn_txdesc *txd = obj;
-	struct rte_eth_dev *dev = opaque;
-	struct rndis_packet_msg *pkt;
 
 	memset(txd, 0, sizeof(*txd));
-	txd->chim_index = idx;
-
-	pkt = rte_malloc_socket("RNDIS_TX", HN_RNDIS_PKT_LEN,
-				rte_align32pow2(HN_RNDIS_PKT_LEN),
-				dev->device->numa_node);
-	if (!pkt)
-		rte_exit(EXIT_FAILURE, "can not allocate RNDIS header");
 
-	txd->rndis_pkt = pkt;
+	txd->queue_id = txq->queue_id;
+	txd->chim_index = NVS_CHIM_IDX_INVALID;
+	txd->rndis_pkt = (struct rndis_packet_msg *)(char *)txq->tx_rndis
+		+ idx * HN_RNDIS_PKT_ALIGNED;
 }
 
-/*
- * Unlike Linux and FreeBSD, this driver uses a mempool
- * to limit outstanding transmits and reserve buffers
- */
 int
-hn_tx_pool_init(struct rte_eth_dev *dev)
+hn_chim_init(struct rte_eth_dev *dev)
 {
 	struct hn_data *hv = dev->data->dev_private;
-	char name[RTE_MEMPOOL_NAMESIZE];
-	struct rte_mempool *mp;
+	uint32_t i, chim_bmp_size;
+
+	rte_spinlock_init(&hv->chim_lock);
+	chim_bmp_size = rte_bitmap_get_memory_footprint(hv->chim_cnt);
+	hv->chim_bmem = rte_zmalloc("hn_chim_bitmap", chim_bmp_size,
+				    RTE_CACHE_LINE_SIZE);
+	if (hv->chim_bmem == NULL) {
+		PMD_INIT_LOG(ERR, "failed to allocate bitmap size %u",
+			     chim_bmp_size);
+		return -1;
+	}
 
-	snprintf(name, sizeof(name),
-		 "hn_txd_%u", dev->data->port_id);
-
-	PMD_INIT_LOG(DEBUG, "create a TX send pool %s n=%u size=%zu socket=%d",
-		     name, hv->chim_cnt, sizeof(struct hn_txdesc),
-		     dev->device->numa_node);
-
-	mp = rte_mempool_create(name, hv->chim_cnt, sizeof(struct hn_txdesc),
-				HN_TXD_CACHE_SIZE, 0,
-				NULL, NULL,
-				hn_txd_init, dev,
-				dev->device->numa_node, 0);
-	if (!mp) {
-		PMD_DRV_LOG(ERR,
-			    "mempool %s create failed: %d", name, rte_errno);
-		return -rte_errno;
+	PMD_INIT_LOG(DEBUG, "create a TX bitmap n=%u size=%u",
+		     hv->chim_cnt, chim_bmp_size);
+
+	hv->chim_bmap = rte_bitmap_init(hv->chim_cnt, hv->chim_bmem,
+					chim_bmp_size);
+	if (hv->chim_bmap == NULL) {
+		PMD_INIT_LOG(ERR, "failed to init chim bitmap");
+		return -1;
 	}
 
-	hv->tx_pool = mp;
+	for (i = 0; i < hv->chim_cnt; i++)
+		rte_bitmap_set(hv->chim_bmap, i);
+
 	return 0;
 }
 
 void
-hn_tx_pool_uninit(struct rte_eth_dev *dev)
+hn_chim_uninit(struct rte_eth_dev *dev)
 {
 	struct hn_data *hv = dev->data->dev_private;
 
-	if (hv->tx_pool) {
-		rte_mempool_free(hv->tx_pool);
-		hv->tx_pool = NULL;
+	rte_bitmap_free(hv->chim_bmap);
+	rte_free(hv->chim_bmem);
+	hv->chim_bmem = NULL;
+}
+
+static uint32_t hn_chim_alloc(struct hn_data *hv)
+{
+	uint32_t index = NVS_CHIM_IDX_INVALID;
+	uint64_t slab;
+
+	rte_spinlock_lock(&hv->chim_lock);
+	if (rte_bitmap_scan(hv->chim_bmap, &index, &slab))
+		rte_bitmap_clear(hv->chim_bmap, index);
+	rte_spinlock_unlock(&hv->chim_lock);
+
+	return index;
+}
+
+static void hn_chim_free(struct hn_data *hv, uint32_t chim_idx)
+{
+	if (chim_idx >= hv->chim_cnt) {
+		PMD_DRV_LOG(ERR, "Invalid chimney index %u", chim_idx);
+	} else {
+		rte_spinlock_lock(&hv->chim_lock);
+		rte_bitmap_set(hv->chim_bmap, chim_idx);
+		rte_spinlock_unlock(&hv->chim_lock);
 	}
 }
 
@@ -220,15 +240,16 @@ static void hn_reset_txagg(struct hn_tx_queue *txq)
 
 int
 hn_dev_tx_queue_setup(struct rte_eth_dev *dev,
-		      uint16_t queue_idx, uint16_t nb_desc __rte_unused,
+		      uint16_t queue_idx, uint16_t nb_desc,
 		      unsigned int socket_id,
 		      const struct rte_eth_txconf *tx_conf)
 
 {
 	struct hn_data *hv = dev->data->dev_private;
 	struct hn_tx_queue *txq;
+	char name[RTE_MEMPOOL_NAMESIZE];
 	uint32_t tx_free_thresh;
-	int err;
+	int err = -ENOMEM;
 
 	PMD_INIT_FUNC_TRACE();
 
@@ -252,6 +273,29 @@ hn_dev_tx_queue_setup(struct rte_eth_dev *dev,
 
 	txq->free_thresh = tx_free_thresh;
 
+	snprintf(name, sizeof(name),
+		 "hn_txd_%u_%u", dev->data->port_id, queue_idx);
+
+	PMD_INIT_LOG(DEBUG, "TX descriptor pool %s n=%u size=%zu",
+		     name, nb_desc, sizeof(struct hn_txdesc));
+
+	txq->tx_rndis = rte_calloc("hn_txq_rndis", nb_desc,
+				   HN_RNDIS_PKT_ALIGNED, RTE_CACHE_LINE_SIZE);
+	if (txq->tx_rndis == NULL)
+		goto error;
+
+	txq->txdesc_pool = rte_mempool_create(name, nb_desc,
+					      sizeof(struct hn_txdesc),
+					      0, 0,
+					      NULL, NULL,
+					      hn_txd_init, txq,
+					      dev->device->numa_node, 0);
+	if (txq->txdesc_pool == NULL) {
+		PMD_DRV_LOG(ERR,
+			    "mempool %s create failed: %d", name, rte_errno);
+		goto error;
+	}
+
 	txq->agg_szmax  = RTE_MIN(hv->chim_szmax, hv->rndis_agg_size);
 	txq->agg_pktmax = hv->rndis_agg_pkts;
 	txq->agg_align  = hv->rndis_agg_align;
@@ -260,31 +304,57 @@ hn_dev_tx_queue_setup(struct rte_eth_dev *dev,
 
 	err = hn_vf_tx_queue_setup(dev, queue_idx, nb_desc,
 				     socket_id, tx_conf);
-	if (err) {
-		rte_free(txq);
-		return err;
+	if (err == 0) {
+		dev->data->tx_queues[queue_idx] = txq;
+		return 0;
 	}
 
-	dev->data->tx_queues[queue_idx] = txq;
-	return 0;
+error:
+	if (txq->txdesc_pool)
+		rte_mempool_free(txq->txdesc_pool);
+	rte_free(txq->tx_rndis);
+	rte_free(txq);
+	return err;
+}
+
+
+static struct hn_txdesc *hn_txd_get(struct hn_tx_queue *txq)
+{
+	struct hn_txdesc *txd;
+
+	if (rte_mempool_get(txq->txdesc_pool, (void **)&txd)) {
+		++txq->stats.ring_full;
+		PMD_TX_LOG(DEBUG, "tx pool exhausted!");
+		return NULL;
+	}
+
+	txd->m = NULL;
+	txd->packets = 0;
+	txd->data_size = 0;
+	txd->chim_size = 0;
+
+	return txd;
+}
+
+static void hn_txd_put(struct hn_tx_queue *txq, struct hn_txdesc *txd)
+{
+	rte_mempool_put(txq->txdesc_pool, txd);
 }
 
 void
 hn_dev_tx_queue_release(void *arg)
 {
 	struct hn_tx_queue *txq = arg;
-	struct hn_txdesc *txd;
 
 	PMD_INIT_FUNC_TRACE();
 
 	if (!txq)
 		return;
 
-	/* If any pending data is still present just drop it */
-	txd = txq->agg_txd;
-	if (txd)
-		rte_mempool_put(txq->hv->tx_pool, txd);
+	if (txq->txdesc_pool)
+		rte_mempool_free(txq->txdesc_pool);
 
+	rte_free(txq->tx_rndis);
 	rte_free(txq);
 }
 
@@ -292,6 +362,7 @@ static void
 hn_nvs_send_completed(struct rte_eth_dev *dev, uint16_t queue_id,
 		      unsigned long xactid, const struct hn_nvs_rndis_ack *ack)
 {
+	struct hn_data *hv = dev->data->dev_private;
 	struct hn_txdesc *txd = (struct hn_txdesc *)xactid;
 	struct hn_tx_queue *txq;
 
@@ -312,9 +383,11 @@ hn_nvs_send_completed(struct rte_eth_dev *dev, uint16_t queue_id,
 		++txq->stats.errors;
 	}
 
-	rte_pktmbuf_free(txd->m);
+	if (txd->chim_index != NVS_CHIM_IDX_INVALID)
+		hn_chim_free(hv, txd->chim_index);
 
-	rte_mempool_put(txq->hv->tx_pool, txd);
+	rte_pktmbuf_free(txd->m);
+	hn_txd_put(txq, txd);
 }
 
 /* Handle transmit completion events */
@@ -1036,28 +1109,15 @@ static int hn_flush_txagg(struct hn_tx_queue *txq, bool *need_sig)
 	return ret;
 }
 
-static struct hn_txdesc *hn_new_txd(struct hn_data *hv,
-				    struct hn_tx_queue *txq)
-{
-	struct hn_txdesc *txd;
-
-	if (rte_mempool_get(hv->tx_pool, (void **)&txd)) {
-		++txq->stats.ring_full;
-		PMD_TX_LOG(DEBUG, "tx pool exhausted!");
-		return NULL;
-	}
-
-	txd->m = NULL;
-	txd->queue_id = txq->queue_id;
-	txd->packets = 0;
-	txd->data_size = 0;
-	txd->chim_size = 0;
-
-	return txd;
-}
-
+/*
+ * Try and find a place in a send chimney buffer to put
+ * the small packet. If space is available, this routine
+ * returns a pointer of where to place the data.
+ * If no space, caller should try direct transmit.
+ */
 static void *
-hn_try_txagg(struct hn_data *hv, struct hn_tx_queue *txq, uint32_t pktsize)
+hn_try_txagg(struct hn_data *hv, struct hn_tx_queue *txq,
+	     struct hn_txdesc *txd, uint32_t pktsize)
 {
 	struct hn_txdesc *agg_txd = txq->agg_txd;
 	struct rndis_packet_msg *pkt;
@@ -1085,7 +1145,7 @@ hn_try_txagg(struct hn_data *hv, struct hn_tx_queue *txq, uint32_t pktsize)
 		}
 
 		chim = (uint8_t *)pkt + pkt->len;
-
+		txq->agg_prevpkt = chim;
 		txq->agg_pktleft--;
 		txq->agg_szleft -= pktsize;
 		if (txq->agg_szleft < HN_PKTSIZE_MIN(txq->agg_align)) {
@@ -1095,18 +1155,21 @@ hn_try_txagg(struct hn_data *hv, struct hn_tx_queue *txq, uint32_t pktsize)
 			 */
 			txq->agg_pktleft = 0;
 		}
-	} else {
-		agg_txd = hn_new_txd(hv, txq);
-		if (!agg_txd)
-			return NULL;
-
-		chim = (uint8_t *)hv->chim_res->addr
-			+ agg_txd->chim_index * hv->chim_szmax;
 
-		txq->agg_txd = agg_txd;
-		txq->agg_pktleft = txq->agg_pktmax - 1;
-		txq->agg_szleft = txq->agg_szmax - pktsize;
+		hn_txd_put(txq, txd);
+		return chim;
 	}
+
+	txd->chim_index = hn_chim_alloc(hv);
+	if (txd->chim_index == NVS_CHIM_IDX_INVALID)
+		return NULL;
+
+	chim = (uint8_t *)hv->chim_res->addr
+			+ txd->chim_index * hv->chim_szmax;
+
+	txq->agg_txd = txd;
+	txq->agg_pktleft = txq->agg_pktmax - 1;
+	txq->agg_szleft = txq->agg_szmax - pktsize;
 	txq->agg_prevpkt = chim;
 
 	return chim;
@@ -1329,13 +1392,18 @@ hn_xmit_pkts(void *ptxq, struct rte_mbuf **tx_pkts, uint16_t nb_pkts)
 		return (*vf_dev->tx_pkt_burst)(sub_q, tx_pkts, nb_pkts);
 	}
 
-	if (rte_mempool_avail_count(hv->tx_pool) <= txq->free_thresh)
+	if (rte_mempool_avail_count(txq->txdesc_pool) <= txq->free_thresh)
 		hn_process_events(hv, txq->queue_id, 0);
 
 	for (nb_tx = 0; nb_tx < nb_pkts; nb_tx++) {
 		struct rte_mbuf *m = tx_pkts[nb_tx];
 		uint32_t pkt_size = m->pkt_len + HN_RNDIS_PKT_LEN;
 		struct rndis_packet_msg *pkt;
+		struct hn_txdesc *txd;
+
+		txd = hn_txd_get(txq);
+		if (txd == NULL)
+			break;
 
 		/* For small packets aggregate them in chimney buffer */
 		if (m->pkt_len < HN_TXCOPY_THRESHOLD && pkt_size <= txq->agg_szmax) {
@@ -1346,7 +1414,8 @@ hn_xmit_pkts(void *ptxq, struct rte_mbuf **tx_pkts, uint16_t nb_pkts)
 					goto fail;
 			}
 
-			pkt = hn_try_txagg(hv, txq, pkt_size);
+
+			pkt = hn_try_txagg(hv, txq, txd, pkt_size);
 			if (unlikely(!pkt))
 				break;
 
@@ -1360,21 +1429,13 @@ hn_xmit_pkts(void *ptxq, struct rte_mbuf **tx_pkts, uint16_t nb_pkts)
 			    hn_flush_txagg(txq, &need_sig))
 				goto fail;
 		} else {
-			struct hn_txdesc *txd;
-
-			/* can send chimney data and large packet at once */
-			txd = txq->agg_txd;
-			if (txd) {
-				hn_reset_txagg(txq);
-			} else {
-				txd = hn_new_txd(hv, txq);
-				if (unlikely(!txd))
-					break;
-			}
+			/* Send any outstanding packets in buffer */
+			if (txq->agg_txd && hn_flush_txagg(txq, &need_sig))
+				goto fail;
 
 			pkt = txd->rndis_pkt;
 			txd->m = m;
-			txd->data_size += m->pkt_len;
+			txd->data_size = m->pkt_len;
 			++txd->packets;
 
 			hn_encap(pkt, queue_id, m);
@@ -1383,7 +1444,7 @@ hn_xmit_pkts(void *ptxq, struct rte_mbuf **tx_pkts, uint16_t nb_pkts)
 			if (unlikely(ret != 0)) {
 				PMD_TX_LOG(NOTICE, "sg send failed: %d", ret);
 				++txq->stats.errors;
-				rte_mempool_put(hv->tx_pool, txd);
+				hn_txd_put(txq, txd);
 				goto fail;
 			}
 		}
diff --git a/drivers/net/netvsc/hn_var.h b/drivers/net/netvsc/hn_var.h
index 05bc492511ec..822d737bd3cc 100644
--- a/drivers/net/netvsc/hn_var.h
+++ b/drivers/net/netvsc/hn_var.h
@@ -52,6 +52,8 @@ struct hn_tx_queue {
 	uint16_t	port_id;
 	uint16_t	queue_id;
 	uint32_t	free_thresh;
+	struct rte_mempool *txdesc_pool;
+	void		*tx_rndis;
 
 	/* Applied packet transmission aggregation limits. */
 	uint32_t	agg_szmax;
@@ -115,8 +117,10 @@ struct hn_data {
 	uint16_t	num_queues;
 	uint64_t	rss_offloads;
 
+	rte_spinlock_t	chim_lock;
 	struct rte_mem_resource *chim_res;	/* UIO resource for Tx */
-	struct rte_mempool *tx_pool;		/* Tx descriptors */
+	struct rte_bitmap *chim_bmap;		/* Send buffer map */
+	void		*chim_bmem;
 	uint32_t	chim_szmax;		/* Max size per buffer */
 	uint32_t	chim_cnt;		/* Max packets per buffer */
 
@@ -157,8 +161,8 @@ uint16_t hn_xmit_pkts(void *tx_queue, struct rte_mbuf **tx_pkts,
 uint16_t hn_recv_pkts(void *rx_queue, struct rte_mbuf **rx_pkts,
 		      uint16_t nb_pkts);
 
-int	hn_tx_pool_init(struct rte_eth_dev *dev);
-void	hn_tx_pool_uninit(struct rte_eth_dev *dev);
+int	hn_chim_init(struct rte_eth_dev *dev);
+void	hn_chim_uninit(struct rte_eth_dev *dev);
 int	hn_dev_link_update(struct rte_eth_dev *dev, int wait);
 int	hn_dev_tx_queue_setup(struct rte_eth_dev *dev, uint16_t queue_idx,
 			      uint16_t nb_desc, unsigned int socket_id,
-- 
2.20.1

[dpdk-dev] [PATCH v3 4/4] net/netvsc: don't enable RSS if only single receive queue

[Stephen Hemminger]

If application has multiple transmit queues but only a single
receive queue, then do not enable RSS.

Fixes: 8b945a7f7dcb ("drivers/net: update Rx RSS hash offload capabilities")
Cc: stable@dpdk.org
Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
---
 drivers/net/netvsc/hn_ethdev.c | 13 ++++++++-----
 1 file changed, 8 insertions(+), 5 deletions(-)

diff --git a/drivers/net/netvsc/hn_ethdev.c b/drivers/net/netvsc/hn_ethdev.c
index ac6610838008..85f43996a623 100644
--- a/drivers/net/netvsc/hn_ethdev.c
+++ b/drivers/net/netvsc/hn_ethdev.c
@@ -597,11 +597,14 @@ static int hn_dev_configure(struct rte_eth_dev *dev)
 			return err;
 		}
 
-		err = hn_rndis_conf_rss(hv, 0);
-		if (err) {
-			PMD_DRV_LOG(NOTICE,
-				    "initial RSS config failed");
-			return err;
+		if ((dev_conf->rxmode.offloads & DEV_RX_OFFLOAD_RSS_HASH) &&
+		    dev->data->nb_rx_queues > 1) {
+			err = hn_rndis_conf_rss(hv, 0);
+			if (err) {
+				PMD_DRV_LOG(NOTICE,
+					    "initial RSS config failed");
+				return err;
+			}
 		}
 	}
 
-- 
2.20.1

[dpdk-dev] [PATCH v4 0/8] net/netvsc: bug fixes

[Stephen Hemminger]

These are bug fixes for netvsc PMD mostly related to issues
in the transmit ring discovered by users of multi-queue.

v4 - add more bug fixes
v3 - fix checkpatch complaints
v2 - simplify the locking on multi-channel setup

Stephen Hemminger (8):
  net/netvsc: propagate descriptor limits from VF to netvsc
  net/netvsc: handle receive packets during multi-channel setup
  net/netvsc: split send buffers from transmit descriptors
  net/netvsc: fix invalid rte_free on dev_close
  net/netvsc: remove process event optimization
  net/netvsc: handle transmit completions based on burst size
  bus/vmbus: simplify args to need_signal
  net/netvsc: avoid possible live lock

 drivers/bus/vmbus/vmbus_bufring.c |   8 +-
 drivers/net/netvsc/hn_ethdev.c    |  25 ++-
 drivers/net/netvsc/hn_nvs.c       |  41 ++++-
 drivers/net/netvsc/hn_rxtx.c      | 281 ++++++++++++++++++------------
 drivers/net/netvsc/hn_var.h       |  12 +-
 drivers/net/netvsc/hn_vf.c        |  13 ++
 6 files changed, 248 insertions(+), 132 deletions(-)

-- 
2.20.1

[dpdk-dev] [PATCH v4 1/8] net/netvsc: propagate descriptor limits from VF to netvsc

[Stephen Hemminger]

If application cares about descriptor limits, the netvsc device
values should reflect those of the VF as well.

Fixes: dc7680e8597c ("net/netvsc: support integrated VF")
Cc: stable@dpdk.org
Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
---
 drivers/net/netvsc/hn_vf.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/drivers/net/netvsc/hn_vf.c b/drivers/net/netvsc/hn_vf.c
index 7a3734cadfa4..1261b2e2ef85 100644
--- a/drivers/net/netvsc/hn_vf.c
+++ b/drivers/net/netvsc/hn_vf.c
@@ -167,6 +167,17 @@ hn_nvs_handle_vfassoc(struct rte_eth_dev *dev,
 		hn_vf_remove(hv);
 }
 
+static void
+hn_vf_merge_desc_lim(struct rte_eth_desc_lim *lim,
+		     const struct rte_eth_desc_lim *vf_lim)
+{
+	lim->nb_max = RTE_MIN(vf_lim->nb_max, lim->nb_max);
+	lim->nb_min = RTE_MAX(vf_lim->nb_min, lim->nb_min);
+	lim->nb_align = RTE_MAX(vf_lim->nb_align, lim->nb_align);
+	lim->nb_seg_max = RTE_MIN(vf_lim->nb_seg_max, lim->nb_seg_max);
+	lim->nb_mtu_seg_max = RTE_MIN(vf_lim->nb_seg_max, lim->nb_seg_max);
+}
+
 /*
  * Merge the info from the VF and synthetic path.
  * use the default config of the VF
@@ -196,11 +207,13 @@ static int hn_vf_info_merge(struct rte_eth_dev *vf_dev,
 				      info->max_tx_queues);
 	info->tx_offload_capa &= vf_info.tx_offload_capa;
 	info->tx_queue_offload_capa &= vf_info.tx_queue_offload_capa;
+	hn_vf_merge_desc_lim(&info->tx_desc_lim, &vf_info.tx_desc_lim);
 
 	info->min_rx_bufsize = RTE_MAX(vf_info.min_rx_bufsize,
 				       info->min_rx_bufsize);
 	info->max_rx_pktlen  = RTE_MAX(vf_info.max_rx_pktlen,
 				       info->max_rx_pktlen);
+	hn_vf_merge_desc_lim(&info->rx_desc_lim, &vf_info.rx_desc_lim);
 
 	return 0;
 }
-- 
2.20.1

[dpdk-dev] [PATCH v4 2/8] net/netvsc: handle receive packets during multi-channel setup

[Stephen Hemminger]

It is possible for a packet to arrive during the configuration
process when setting up multiple queue mode. This would cause
configure to fail; fix by just ignoring receive packets while
waiting for control commands.

Use the receive ring lock to avoid possible races between
oddly behaved applications doing rx_burst and control operations
concurrently.

Fixes: 4e9c73e96e83 ("net/netvsc: add Hyper-V network device")
Cc: stable@dpdk.org
Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
---
 drivers/net/netvsc/hn_nvs.c | 41 +++++++++++++++++++++++++++++++++++--
 1 file changed, 39 insertions(+), 2 deletions(-)

diff --git a/drivers/net/netvsc/hn_nvs.c b/drivers/net/netvsc/hn_nvs.c
index 6b518685ab6f..477202b2a0b7 100644
--- a/drivers/net/netvsc/hn_nvs.c
+++ b/drivers/net/netvsc/hn_nvs.c
@@ -54,7 +54,7 @@ static int hn_nvs_req_send(struct hn_data *hv,
 }
 
 static int
-hn_nvs_execute(struct hn_data *hv,
+__hn_nvs_execute(struct hn_data *hv,
 	       void *req, uint32_t reqlen,
 	       void *resp, uint32_t resplen,
 	       uint32_t type)
@@ -62,6 +62,7 @@ hn_nvs_execute(struct hn_data *hv,
 	struct vmbus_channel *chan = hn_primary_chan(hv);
 	char buffer[NVS_RESPSIZE_MAX];
 	const struct hn_nvs_hdr *hdr;
+	uint64_t xactid;
 	uint32_t len;
 	int ret;
 
@@ -77,7 +78,7 @@ hn_nvs_execute(struct hn_data *hv,
 
  retry:
 	len = sizeof(buffer);
-	ret = rte_vmbus_chan_recv(chan, buffer, &len, NULL);
+	ret = rte_vmbus_chan_recv(chan, buffer, &len, &xactid);
 	if (ret == -EAGAIN) {
 		rte_delay_us(HN_CHAN_INTERVAL_US);
 		goto retry;
@@ -88,7 +89,20 @@ hn_nvs_execute(struct hn_data *hv,
 		return ret;
 	}
 
+	if (len < sizeof(*hdr)) {
+		PMD_DRV_LOG(ERR, "response missing NVS header");
+		return -EINVAL;
+	}
+
 	hdr = (struct hn_nvs_hdr *)buffer;
+
+	/* Silently drop received packets while waiting for response */
+	if (hdr->type == NVS_TYPE_RNDIS) {
+		hn_nvs_ack_rxbuf(chan, xactid);
+		--hv->rxbuf_outstanding;
+		goto retry;
+	}
+
 	if (hdr->type != type) {
 		PMD_DRV_LOG(ERR, "unexpected NVS resp %#x, expect %#x",
 			    hdr->type, type);
@@ -108,6 +122,29 @@ hn_nvs_execute(struct hn_data *hv,
 	return 0;
 }
 
+
+/*
+ * Execute one control command and get the response.
+ * Only one command can be active on a channel at once
+ * Unlike BSD, DPDK does not have an interrupt context
+ * so the polling is required to wait for response.
+ */
+static int
+hn_nvs_execute(struct hn_data *hv,
+	       void *req, uint32_t reqlen,
+	       void *resp, uint32_t resplen,
+	       uint32_t type)
+{
+	struct hn_rx_queue *rxq = hv->primary;
+	int ret;
+
+	rte_spinlock_lock(&rxq->ring_lock);
+	ret = __hn_nvs_execute(hv, req, reqlen, resp, resplen, type);
+	rte_spinlock_unlock(&rxq->ring_lock);
+
+	return ret;
+}
+
 static int
 hn_nvs_doinit(struct hn_data *hv, uint32_t nvs_ver)
 {
-- 
2.20.1

[dpdk-dev] [PATCH v4 3/8] net/netvsc: split send buffers from transmit descriptors

[Stephen Hemminger]

The VMBus has reserved transmit area (per device) and transmit descriptors
(per queue). The previous code was always having a 1:1 mapping between
send buffers and descriptors. This can lead to one queue starving another
and also buffer bloat.

Change to working more like FreeBSD where there is a pool of transmit
descriptors per queue. If send buffer is not available then no aggregation
happens but the queue can still drain.

Fixes: 4e9c73e96e83 ("net/netvsc: add Hyper-V network device")
Cc: stable@dpdk.org
Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
---
 drivers/net/netvsc/hn_ethdev.c |   9 +-
 drivers/net/netvsc/hn_rxtx.c   | 271 ++++++++++++++++++++-------------
 drivers/net/netvsc/hn_var.h    |  10 +-
 3 files changed, 180 insertions(+), 110 deletions(-)

diff --git a/drivers/net/netvsc/hn_ethdev.c b/drivers/net/netvsc/hn_ethdev.c
index 564620748daf..ac6610838008 100644
--- a/drivers/net/netvsc/hn_ethdev.c
+++ b/drivers/net/netvsc/hn_ethdev.c
@@ -257,6 +257,9 @@ static int hn_dev_info_get(struct rte_eth_dev *dev,
 	dev_info->max_rx_queues = hv->max_queues;
 	dev_info->max_tx_queues = hv->max_queues;
 
+	dev_info->tx_desc_lim.nb_min = 1;
+	dev_info->tx_desc_lim.nb_max = 4096;
+
 	if (rte_eal_process_type() != RTE_PROC_PRIMARY)
 		return 0;
 
@@ -982,7 +985,7 @@ eth_hn_dev_init(struct rte_eth_dev *eth_dev)
 	if  (err)
 		goto failed;
 
-	err = hn_tx_pool_init(eth_dev);
+	err = hn_chim_init(eth_dev);
 	if (err)
 		goto failed;
 
@@ -1018,7 +1021,7 @@ eth_hn_dev_init(struct rte_eth_dev *eth_dev)
 failed:
 	PMD_INIT_LOG(NOTICE, "device init failed");
 
-	hn_tx_pool_uninit(eth_dev);
+	hn_chim_uninit(eth_dev);
 	hn_detach(hv);
 	return err;
 }
@@ -1042,7 +1045,7 @@ eth_hn_dev_uninit(struct rte_eth_dev *eth_dev)
 	eth_dev->rx_pkt_burst = NULL;
 
 	hn_detach(hv);
-	hn_tx_pool_uninit(eth_dev);
+	hn_chim_uninit(eth_dev);
 	rte_vmbus_chan_close(hv->primary->chan);
 	rte_free(hv->primary);
 	ret = rte_eth_dev_owner_delete(hv->owner.id);
diff --git a/drivers/net/netvsc/hn_rxtx.c b/drivers/net/netvsc/hn_rxtx.c
index 7212780c156e..32c03e3da0c7 100644
--- a/drivers/net/netvsc/hn_rxtx.c
+++ b/drivers/net/netvsc/hn_rxtx.c
@@ -18,6 +18,7 @@
 #include <rte_memzone.h>
 #include <rte_malloc.h>
 #include <rte_atomic.h>
+#include <rte_bitmap.h>
 #include <rte_branch_prediction.h>
 #include <rte_ether.h>
 #include <rte_common.h>
@@ -83,7 +84,7 @@ struct hn_txdesc {
 	struct rte_mbuf *m;
 
 	uint16_t	queue_id;
-	uint16_t	chim_index;
+	uint32_t	chim_index;
 	uint32_t	chim_size;
 	uint32_t	data_size;
 	uint32_t	packets;
@@ -98,11 +99,13 @@ struct hn_txdesc {
 	 RNDIS_PKTINFO_SIZE(NDIS_LSO2_INFO_SIZE) +	\
 	 RNDIS_PKTINFO_SIZE(NDIS_TXCSUM_INFO_SIZE))
 
+#define HN_RNDIS_PKT_ALIGNED	RTE_ALIGN(HN_RNDIS_PKT_LEN, RTE_CACHE_LINE_SIZE)
+
 /* Minimum space required for a packet */
 #define HN_PKTSIZE_MIN(align) \
 	RTE_ALIGN(RTE_ETHER_MIN_LEN + HN_RNDIS_PKT_LEN, align)
 
-#define DEFAULT_TX_FREE_THRESH 32U
+#define DEFAULT_TX_FREE_THRESH 32
 
 static void
 hn_update_packet_stats(struct hn_stats *stats, const struct rte_mbuf *m)
@@ -150,63 +153,77 @@ hn_rndis_pktmsg_offset(uint32_t ofs)
 static void hn_txd_init(struct rte_mempool *mp __rte_unused,
 			void *opaque, void *obj, unsigned int idx)
 {
+	struct hn_tx_queue *txq = opaque;
 	struct hn_txdesc *txd = obj;
-	struct rte_eth_dev *dev = opaque;
-	struct rndis_packet_msg *pkt;
 
 	memset(txd, 0, sizeof(*txd));
-	txd->chim_index = idx;
-
-	pkt = rte_malloc_socket("RNDIS_TX", HN_RNDIS_PKT_LEN,
-				rte_align32pow2(HN_RNDIS_PKT_LEN),
-				dev->device->numa_node);
-	if (!pkt)
-		rte_exit(EXIT_FAILURE, "can not allocate RNDIS header");
 
-	txd->rndis_pkt = pkt;
+	txd->queue_id = txq->queue_id;
+	txd->chim_index = NVS_CHIM_IDX_INVALID;
+	txd->rndis_pkt = (struct rndis_packet_msg *)(char *)txq->tx_rndis
+		+ idx * HN_RNDIS_PKT_ALIGNED;
 }
 
-/*
- * Unlike Linux and FreeBSD, this driver uses a mempool
- * to limit outstanding transmits and reserve buffers
- */
 int
-hn_tx_pool_init(struct rte_eth_dev *dev)
+hn_chim_init(struct rte_eth_dev *dev)
 {
 	struct hn_data *hv = dev->data->dev_private;
-	char name[RTE_MEMPOOL_NAMESIZE];
-	struct rte_mempool *mp;
+	uint32_t i, chim_bmp_size;
+
+	rte_spinlock_init(&hv->chim_lock);
+	chim_bmp_size = rte_bitmap_get_memory_footprint(hv->chim_cnt);
+	hv->chim_bmem = rte_zmalloc("hn_chim_bitmap", chim_bmp_size,
+				    RTE_CACHE_LINE_SIZE);
+	if (hv->chim_bmem == NULL) {
+		PMD_INIT_LOG(ERR, "failed to allocate bitmap size %u",
+			     chim_bmp_size);
+		return -1;
+	}
 
-	snprintf(name, sizeof(name),
-		 "hn_txd_%u", dev->data->port_id);
-
-	PMD_INIT_LOG(DEBUG, "create a TX send pool %s n=%u size=%zu socket=%d",
-		     name, hv->chim_cnt, sizeof(struct hn_txdesc),
-		     dev->device->numa_node);
-
-	mp = rte_mempool_create(name, hv->chim_cnt, sizeof(struct hn_txdesc),
-				HN_TXD_CACHE_SIZE, 0,
-				NULL, NULL,
-				hn_txd_init, dev,
-				dev->device->numa_node, 0);
-	if (!mp) {
-		PMD_DRV_LOG(ERR,
-			    "mempool %s create failed: %d", name, rte_errno);
-		return -rte_errno;
+	hv->chim_bmap = rte_bitmap_init(hv->chim_cnt,
+					hv->chim_bmem, chim_bmp_size);
+	if (hv->chim_bmap == NULL) {
+		PMD_INIT_LOG(ERR, "failed to init chim bitmap");
+		return -1;
 	}
 
-	hv->tx_pool = mp;
+	for (i = 0; i < hv->chim_cnt; i++)
+		rte_bitmap_set(hv->chim_bmap, i);
+
 	return 0;
 }
 
 void
-hn_tx_pool_uninit(struct rte_eth_dev *dev)
+hn_chim_uninit(struct rte_eth_dev *dev)
 {
 	struct hn_data *hv = dev->data->dev_private;
 
-	if (hv->tx_pool) {
-		rte_mempool_free(hv->tx_pool);
-		hv->tx_pool = NULL;
+	rte_bitmap_free(hv->chim_bmap);
+	rte_free(hv->chim_bmem);
+	hv->chim_bmem = NULL;
+}
+
+static uint32_t hn_chim_alloc(struct hn_data *hv)
+{
+	uint32_t index = NVS_CHIM_IDX_INVALID;
+	uint64_t slab;
+
+	rte_spinlock_lock(&hv->chim_lock);
+	if (rte_bitmap_scan(hv->chim_bmap, &index, &slab))
+		rte_bitmap_clear(hv->chim_bmap, index);
+	rte_spinlock_unlock(&hv->chim_lock);
+
+	return index;
+}
+
+static void hn_chim_free(struct hn_data *hv, uint32_t chim_idx)
+{
+	if (chim_idx >= hv->chim_cnt) {
+		PMD_DRV_LOG(ERR, "Invalid chimney index %u", chim_idx);
+	} else {
+		rte_spinlock_lock(&hv->chim_lock);
+		rte_bitmap_set(hv->chim_bmap, chim_idx);
+		rte_spinlock_unlock(&hv->chim_lock);
 	}
 }
 
@@ -220,15 +237,16 @@ static void hn_reset_txagg(struct hn_tx_queue *txq)
 
 int
 hn_dev_tx_queue_setup(struct rte_eth_dev *dev,
-		      uint16_t queue_idx, uint16_t nb_desc __rte_unused,
+		      uint16_t queue_idx, uint16_t nb_desc,
 		      unsigned int socket_id,
 		      const struct rte_eth_txconf *tx_conf)
 
 {
 	struct hn_data *hv = dev->data->dev_private;
 	struct hn_tx_queue *txq;
+	char name[RTE_MEMPOOL_NAMESIZE];
 	uint32_t tx_free_thresh;
-	int err;
+	int err = -ENOMEM;
 
 	PMD_INIT_FUNC_TRACE();
 
@@ -244,14 +262,42 @@ hn_dev_tx_queue_setup(struct rte_eth_dev *dev,
 
 	tx_free_thresh = tx_conf->tx_free_thresh;
 	if (tx_free_thresh == 0)
-		tx_free_thresh = RTE_MIN(hv->chim_cnt / 4,
+		tx_free_thresh = RTE_MIN(nb_desc / 4,
 					 DEFAULT_TX_FREE_THRESH);
 
-	if (tx_free_thresh >= hv->chim_cnt - 3)
-		tx_free_thresh = hv->chim_cnt - 3;
+	if (tx_free_thresh + 3 >= nb_desc) {
+		PMD_INIT_LOG(ERR,
+			     "tx_free_thresh must be less than the number of TX entries minus 3(%u)."
+			     " (tx_free_thresh=%u port=%u queue=%u)\n",
+			     nb_desc - 3,
+			     tx_free_thresh, dev->data->port_id, queue_idx);
+		return -EINVAL;
+	}
 
 	txq->free_thresh = tx_free_thresh;
 
+	snprintf(name, sizeof(name),
+		 "hn_txd_%u_%u", dev->data->port_id, queue_idx);
+
+	PMD_INIT_LOG(DEBUG, "TX descriptor pool %s n=%u size=%zu",
+		     name, nb_desc, sizeof(struct hn_txdesc));
+
+	txq->tx_rndis = rte_calloc("hn_txq_rndis", nb_desc,
+				   HN_RNDIS_PKT_ALIGNED, RTE_CACHE_LINE_SIZE);
+	if (txq->tx_rndis == NULL)
+		goto error;
+
+	txq->txdesc_pool = rte_mempool_create(name, nb_desc,
+					      sizeof(struct hn_txdesc),
+					      0, 0, NULL, NULL,
+					      hn_txd_init, txq,
+					      dev->device->numa_node, 0);
+	if (txq->txdesc_pool == NULL) {
+		PMD_DRV_LOG(ERR,
+			    "mempool %s create failed: %d", name, rte_errno);
+		goto error;
+	}
+
 	txq->agg_szmax  = RTE_MIN(hv->chim_szmax, hv->rndis_agg_size);
 	txq->agg_pktmax = hv->rndis_agg_pkts;
 	txq->agg_align  = hv->rndis_agg_align;
@@ -260,31 +306,57 @@ hn_dev_tx_queue_setup(struct rte_eth_dev *dev,
 
 	err = hn_vf_tx_queue_setup(dev, queue_idx, nb_desc,
 				     socket_id, tx_conf);
-	if (err) {
-		rte_free(txq);
-		return err;
+	if (err == 0) {
+		dev->data->tx_queues[queue_idx] = txq;
+		return 0;
 	}
 
-	dev->data->tx_queues[queue_idx] = txq;
-	return 0;
+error:
+	if (txq->txdesc_pool)
+		rte_mempool_free(txq->txdesc_pool);
+	rte_free(txq->tx_rndis);
+	rte_free(txq);
+	return err;
+}
+
+
+static struct hn_txdesc *hn_txd_get(struct hn_tx_queue *txq)
+{
+	struct hn_txdesc *txd;
+
+	if (rte_mempool_get(txq->txdesc_pool, (void **)&txd)) {
+		++txq->stats.ring_full;
+		PMD_TX_LOG(DEBUG, "tx pool exhausted!");
+		return NULL;
+	}
+
+	txd->m = NULL;
+	txd->packets = 0;
+	txd->data_size = 0;
+	txd->chim_size = 0;
+
+	return txd;
+}
+
+static void hn_txd_put(struct hn_tx_queue *txq, struct hn_txdesc *txd)
+{
+	rte_mempool_put(txq->txdesc_pool, txd);
 }
 
 void
 hn_dev_tx_queue_release(void *arg)
 {
 	struct hn_tx_queue *txq = arg;
-	struct hn_txdesc *txd;
 
 	PMD_INIT_FUNC_TRACE();
 
 	if (!txq)
 		return;
 
-	/* If any pending data is still present just drop it */
-	txd = txq->agg_txd;
-	if (txd)
-		rte_mempool_put(txq->hv->tx_pool, txd);
+	if (txq->txdesc_pool)
+		rte_mempool_free(txq->txdesc_pool);
 
+	rte_free(txq->tx_rndis);
 	rte_free(txq);
 }
 
@@ -292,6 +364,7 @@ static void
 hn_nvs_send_completed(struct rte_eth_dev *dev, uint16_t queue_id,
 		      unsigned long xactid, const struct hn_nvs_rndis_ack *ack)
 {
+	struct hn_data *hv = dev->data->dev_private;
 	struct hn_txdesc *txd = (struct hn_txdesc *)xactid;
 	struct hn_tx_queue *txq;
 
@@ -312,9 +385,11 @@ hn_nvs_send_completed(struct rte_eth_dev *dev, uint16_t queue_id,
 		++txq->stats.errors;
 	}
 
-	rte_pktmbuf_free(txd->m);
+	if (txd->chim_index != NVS_CHIM_IDX_INVALID)
+		hn_chim_free(hv, txd->chim_index);
 
-	rte_mempool_put(txq->hv->tx_pool, txd);
+	rte_pktmbuf_free(txd->m);
+	hn_txd_put(txq, txd);
 }
 
 /* Handle transmit completion events */
@@ -1036,28 +1111,15 @@ static int hn_flush_txagg(struct hn_tx_queue *txq, bool *need_sig)
 	return ret;
 }
 
-static struct hn_txdesc *hn_new_txd(struct hn_data *hv,
-				    struct hn_tx_queue *txq)
-{
-	struct hn_txdesc *txd;
-
-	if (rte_mempool_get(hv->tx_pool, (void **)&txd)) {
-		++txq->stats.ring_full;
-		PMD_TX_LOG(DEBUG, "tx pool exhausted!");
-		return NULL;
-	}
-
-	txd->m = NULL;
-	txd->queue_id = txq->queue_id;
-	txd->packets = 0;
-	txd->data_size = 0;
-	txd->chim_size = 0;
-
-	return txd;
-}
-
+/*
+ * Try and find a place in a send chimney buffer to put
+ * the small packet. If space is available, this routine
+ * returns a pointer of where to place the data.
+ * If no space, caller should try direct transmit.
+ */
 static void *
-hn_try_txagg(struct hn_data *hv, struct hn_tx_queue *txq, uint32_t pktsize)
+hn_try_txagg(struct hn_data *hv, struct hn_tx_queue *txq,
+	     struct hn_txdesc *txd, uint32_t pktsize)
 {
 	struct hn_txdesc *agg_txd = txq->agg_txd;
 	struct rndis_packet_msg *pkt;
@@ -1085,7 +1147,7 @@ hn_try_txagg(struct hn_data *hv, struct hn_tx_queue *txq, uint32_t pktsize)
 		}
 
 		chim = (uint8_t *)pkt + pkt->len;
-
+		txq->agg_prevpkt = chim;
 		txq->agg_pktleft--;
 		txq->agg_szleft -= pktsize;
 		if (txq->agg_szleft < HN_PKTSIZE_MIN(txq->agg_align)) {
@@ -1095,18 +1157,21 @@ hn_try_txagg(struct hn_data *hv, struct hn_tx_queue *txq, uint32_t pktsize)
 			 */
 			txq->agg_pktleft = 0;
 		}
-	} else {
-		agg_txd = hn_new_txd(hv, txq);
-		if (!agg_txd)
-			return NULL;
-
-		chim = (uint8_t *)hv->chim_res->addr
-			+ agg_txd->chim_index * hv->chim_szmax;
 
-		txq->agg_txd = agg_txd;
-		txq->agg_pktleft = txq->agg_pktmax - 1;
-		txq->agg_szleft = txq->agg_szmax - pktsize;
+		hn_txd_put(txq, txd);
+		return chim;
 	}
+
+	txd->chim_index = hn_chim_alloc(hv);
+	if (txd->chim_index == NVS_CHIM_IDX_INVALID)
+		return NULL;
+
+	chim = (uint8_t *)hv->chim_res->addr
+			+ txd->chim_index * hv->chim_szmax;
+
+	txq->agg_txd = txd;
+	txq->agg_pktleft = txq->agg_pktmax - 1;
+	txq->agg_szleft = txq->agg_szmax - pktsize;
 	txq->agg_prevpkt = chim;
 
 	return chim;
@@ -1329,13 +1394,18 @@ hn_xmit_pkts(void *ptxq, struct rte_mbuf **tx_pkts, uint16_t nb_pkts)
 		return (*vf_dev->tx_pkt_burst)(sub_q, tx_pkts, nb_pkts);
 	}
 
-	if (rte_mempool_avail_count(hv->tx_pool) <= txq->free_thresh)
+	if (rte_mempool_avail_count(txq->txdesc_pool) <= txq->free_thresh)
 		hn_process_events(hv, txq->queue_id, 0);
 
 	for (nb_tx = 0; nb_tx < nb_pkts; nb_tx++) {
 		struct rte_mbuf *m = tx_pkts[nb_tx];
 		uint32_t pkt_size = m->pkt_len + HN_RNDIS_PKT_LEN;
 		struct rndis_packet_msg *pkt;
+		struct hn_txdesc *txd;
+
+		txd = hn_txd_get(txq);
+		if (txd == NULL)
+			break;
 
 		/* For small packets aggregate them in chimney buffer */
 		if (m->pkt_len < HN_TXCOPY_THRESHOLD && pkt_size <= txq->agg_szmax) {
@@ -1346,7 +1416,8 @@ hn_xmit_pkts(void *ptxq, struct rte_mbuf **tx_pkts, uint16_t nb_pkts)
 					goto fail;
 			}
 
-			pkt = hn_try_txagg(hv, txq, pkt_size);
+
+			pkt = hn_try_txagg(hv, txq, txd, pkt_size);
 			if (unlikely(!pkt))
 				break;
 
@@ -1360,21 +1431,13 @@ hn_xmit_pkts(void *ptxq, struct rte_mbuf **tx_pkts, uint16_t nb_pkts)
 			    hn_flush_txagg(txq, &need_sig))
 				goto fail;
 		} else {
-			struct hn_txdesc *txd;
-
-			/* can send chimney data and large packet at once */
-			txd = txq->agg_txd;
-			if (txd) {
-				hn_reset_txagg(txq);
-			} else {
-				txd = hn_new_txd(hv, txq);
-				if (unlikely(!txd))
-					break;
-			}
+			/* Send any outstanding packets in buffer */
+			if (txq->agg_txd && hn_flush_txagg(txq, &need_sig))
+				goto fail;
 
 			pkt = txd->rndis_pkt;
 			txd->m = m;
-			txd->data_size += m->pkt_len;
+			txd->data_size = m->pkt_len;
 			++txd->packets;
 
 			hn_encap(pkt, queue_id, m);
@@ -1383,7 +1446,7 @@ hn_xmit_pkts(void *ptxq, struct rte_mbuf **tx_pkts, uint16_t nb_pkts)
 			if (unlikely(ret != 0)) {
 				PMD_TX_LOG(NOTICE, "sg send failed: %d", ret);
 				++txq->stats.errors;
-				rte_mempool_put(hv->tx_pool, txd);
+				hn_txd_put(txq, txd);
 				goto fail;
 			}
 		}
diff --git a/drivers/net/netvsc/hn_var.h b/drivers/net/netvsc/hn_var.h
index 05bc492511ec..822d737bd3cc 100644
--- a/drivers/net/netvsc/hn_var.h
+++ b/drivers/net/netvsc/hn_var.h
@@ -52,6 +52,8 @@ struct hn_tx_queue {
 	uint16_t	port_id;
 	uint16_t	queue_id;
 	uint32_t	free_thresh;
+	struct rte_mempool *txdesc_pool;
+	void		*tx_rndis;
 
 	/* Applied packet transmission aggregation limits. */
 	uint32_t	agg_szmax;
@@ -115,8 +117,10 @@ struct hn_data {
 	uint16_t	num_queues;
 	uint64_t	rss_offloads;
 
+	rte_spinlock_t	chim_lock;
 	struct rte_mem_resource *chim_res;	/* UIO resource for Tx */
-	struct rte_mempool *tx_pool;		/* Tx descriptors */
+	struct rte_bitmap *chim_bmap;		/* Send buffer map */
+	void		*chim_bmem;
 	uint32_t	chim_szmax;		/* Max size per buffer */
 	uint32_t	chim_cnt;		/* Max packets per buffer */
 
@@ -157,8 +161,8 @@ uint16_t hn_xmit_pkts(void *tx_queue, struct rte_mbuf **tx_pkts,
 uint16_t hn_recv_pkts(void *rx_queue, struct rte_mbuf **rx_pkts,
 		      uint16_t nb_pkts);
 
-int	hn_tx_pool_init(struct rte_eth_dev *dev);
-void	hn_tx_pool_uninit(struct rte_eth_dev *dev);
+int	hn_chim_init(struct rte_eth_dev *dev);
+void	hn_chim_uninit(struct rte_eth_dev *dev);
 int	hn_dev_link_update(struct rte_eth_dev *dev, int wait);
 int	hn_dev_tx_queue_setup(struct rte_eth_dev *dev, uint16_t queue_idx,
 			      uint16_t nb_desc, unsigned int socket_id,
-- 
2.20.1

[dpdk-dev] [PATCH v4 4/8] net/netvsc: fix invalid rte_free on dev_close

[Stephen Hemminger]

The netvsc PMD was putting the mac address in private data but the
core rte_ethdev doesn't allow that it. It has to be in rte_malloc'd
memory or the a message will be printed on shutdown/close.
 EAL: Invalid memory

Fixes: f8279f47dd89 ("net/netvsc: fix crash in secondary process")
Cc: stable@dpdk.org
Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
---
 drivers/net/netvsc/hn_ethdev.c | 16 ++++++++++------
 drivers/net/netvsc/hn_var.h    |  2 --
 2 files changed, 10 insertions(+), 8 deletions(-)

diff --git a/drivers/net/netvsc/hn_ethdev.c b/drivers/net/netvsc/hn_ethdev.c
index ac6610838008..05f1a25a1abc 100644
--- a/drivers/net/netvsc/hn_ethdev.c
+++ b/drivers/net/netvsc/hn_ethdev.c
@@ -134,8 +134,6 @@ eth_dev_vmbus_allocate(struct rte_vmbus_device *dev, size_t private_data_size)
 static void
 eth_dev_vmbus_release(struct rte_eth_dev *eth_dev)
 {
-	/* mac_addrs must not be freed alone because part of dev_private */
-	eth_dev->data->mac_addrs = NULL;
 	/* free ether device */
 	rte_eth_dev_release_port(eth_dev);
 
@@ -937,9 +935,6 @@ eth_hn_dev_init(struct rte_eth_dev *eth_dev)
 	eth_dev->tx_pkt_burst = &hn_xmit_pkts;
 	eth_dev->rx_pkt_burst = &hn_recv_pkts;
 
-	/* Since Hyper-V only supports one MAC address, just use local data */
-	eth_dev->data->mac_addrs = &hv->mac_addr;
-
 	/*
 	 * for secondary processes, we don't initialize any further as primary
 	 * has already done this work.
@@ -947,6 +942,15 @@ eth_hn_dev_init(struct rte_eth_dev *eth_dev)
 	if (rte_eal_process_type() != RTE_PROC_PRIMARY)
 		return 0;
 
+	/* Since Hyper-V only supports one MAC address */
+	eth_dev->data->mac_addrs = rte_calloc("hv_mac", HN_MAX_MAC_ADDRS,
+					      sizeof(struct rte_ether_addr), 0);
+	if (eth_dev->data->mac_addrs == NULL) {
+		PMD_INIT_LOG(ERR,
+			     "Failed to allocate memory store MAC addresses");
+		return -ENOMEM;
+	}
+
 	hv->vmbus = vmbus;
 	hv->rxbuf_res = &vmbus->resource[HV_RECV_BUF_MAP];
 	hv->chim_res  = &vmbus->resource[HV_SEND_BUF_MAP];
@@ -989,7 +993,7 @@ eth_hn_dev_init(struct rte_eth_dev *eth_dev)
 	if (err)
 		goto failed;
 
-	err = hn_rndis_get_eaddr(hv, hv->mac_addr.addr_bytes);
+	err = hn_rndis_get_eaddr(hv, eth_dev->data->mac_addrs->addr_bytes);
 	if (err)
 		goto failed;
 
diff --git a/drivers/net/netvsc/hn_var.h b/drivers/net/netvsc/hn_var.h
index 822d737bd3cc..b4c61717379f 100644
--- a/drivers/net/netvsc/hn_var.h
+++ b/drivers/net/netvsc/hn_var.h
@@ -139,8 +139,6 @@ struct hn_data {
 	uint8_t		rss_key[40];
 	uint16_t	rss_ind[128];
 
-	struct rte_ether_addr mac_addr;
-
 	struct rte_eth_dev_owner owner;
 	struct rte_intr_handle vf_intr;
 
-- 
2.20.1

Re: [dpdk-dev] [dpdk-stable] [PATCH v4 4/8] net/netvsc: fix invalid rte_free on dev_close

[Ferruh Yigit]

On 3/31/2020 6:14 PM, Stephen Hemminger wrote:
> The netvsc PMD was putting the mac address in private data but the
> core rte_ethdev doesn't allow that it. It has to be in rte_malloc'd
> memory or the a message will be printed on shutdown/close.

It doesn't have to be rte_malloc'ed. Setting 'eth_dev->data->mac_addrs' to null
in 'hn_dev_close()' should fix it.

But dynamically allocating it also works if that is what preferred.

>  EAL: Invalid memory
> 
> Fixes: f8279f47dd89 ("net/netvsc: fix crash in secondary process")
> Cc: stable@dpdk.org
> Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
> ---
>  drivers/net/netvsc/hn_ethdev.c | 16 ++++++++++------
>  drivers/net/netvsc/hn_var.h    |  2 --
>  2 files changed, 10 insertions(+), 8 deletions(-)
> 
> diff --git a/drivers/net/netvsc/hn_ethdev.c b/drivers/net/netvsc/hn_ethdev.c
> index ac6610838008..05f1a25a1abc 100644
> --- a/drivers/net/netvsc/hn_ethdev.c
> +++ b/drivers/net/netvsc/hn_ethdev.c
> @@ -134,8 +134,6 @@ eth_dev_vmbus_allocate(struct rte_vmbus_device *dev, size_t private_data_size)
>  static void
>  eth_dev_vmbus_release(struct rte_eth_dev *eth_dev)
>  {
> -	/* mac_addrs must not be freed alone because part of dev_private */
> -	eth_dev->data->mac_addrs = NULL;
>  	/* free ether device */
>  	rte_eth_dev_release_port(eth_dev);
>  
> @@ -937,9 +935,6 @@ eth_hn_dev_init(struct rte_eth_dev *eth_dev)
>  	eth_dev->tx_pkt_burst = &hn_xmit_pkts;
>  	eth_dev->rx_pkt_burst = &hn_recv_pkts;
>  
> -	/* Since Hyper-V only supports one MAC address, just use local data */
> -	eth_dev->data->mac_addrs = &hv->mac_addr;
> -
>  	/*
>  	 * for secondary processes, we don't initialize any further as primary
>  	 * has already done this work.
> @@ -947,6 +942,15 @@ eth_hn_dev_init(struct rte_eth_dev *eth_dev)
>  	if (rte_eal_process_type() != RTE_PROC_PRIMARY)
>  		return 0;
>  
> +	/* Since Hyper-V only supports one MAC address */
> +	eth_dev->data->mac_addrs = rte_calloc("hv_mac", HN_MAX_MAC_ADDRS,
> +					      sizeof(struct rte_ether_addr), 0);
> +	if (eth_dev->data->mac_addrs == NULL) {
> +		PMD_INIT_LOG(ERR,
> +			     "Failed to allocate memory store MAC addresses");
> +		return -ENOMEM;
> +	}
> +
>  	hv->vmbus = vmbus;
>  	hv->rxbuf_res = &vmbus->resource[HV_RECV_BUF_MAP];
>  	hv->chim_res  = &vmbus->resource[HV_SEND_BUF_MAP];
> @@ -989,7 +993,7 @@ eth_hn_dev_init(struct rte_eth_dev *eth_dev)
>  	if (err)
>  		goto failed;
>  
> -	err = hn_rndis_get_eaddr(hv, hv->mac_addr.addr_bytes);
> +	err = hn_rndis_get_eaddr(hv, eth_dev->data->mac_addrs->addr_bytes);
>  	if (err)
>  		goto failed;
>  
> diff --git a/drivers/net/netvsc/hn_var.h b/drivers/net/netvsc/hn_var.h
> index 822d737bd3cc..b4c61717379f 100644
> --- a/drivers/net/netvsc/hn_var.h
> +++ b/drivers/net/netvsc/hn_var.h
> @@ -139,8 +139,6 @@ struct hn_data {
>  	uint8_t		rss_key[40];
>  	uint16_t	rss_ind[128];
>  
> -	struct rte_ether_addr mac_addr;
> -
>  	struct rte_eth_dev_owner owner;
>  	struct rte_intr_handle vf_intr;
>  
> 

[dpdk-dev] [PATCH v4 5/8] net/netvsc: remove process event optimization

[Stephen Hemminger]

Remove unlocked check for data in receive ring.
This check is not safe because of missing barriers etc.

Fixes: 4e9c73e96e83 ("net/netvsc: add Hyper-V network device")
Cc: stable@dpdk.org
Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
---
 drivers/net/netvsc/hn_rxtx.c | 4 ----
 1 file changed, 4 deletions(-)

diff --git a/drivers/net/netvsc/hn_rxtx.c b/drivers/net/netvsc/hn_rxtx.c
index 32c03e3da0c7..e8df84604202 100644
--- a/drivers/net/netvsc/hn_rxtx.c
+++ b/drivers/net/netvsc/hn_rxtx.c
@@ -969,10 +969,6 @@ uint32_t hn_process_events(struct hn_data *hv, uint16_t queue_id,
 
 	rxq = queue_id == 0 ? hv->primary : dev->data->rx_queues[queue_id];
 
-	/* If no pending data then nothing to do */
-	if (rte_vmbus_chan_rx_empty(rxq->chan))
-		return 0;
-
 	/*
 	 * Since channel is shared between Rx and TX queue need to have a lock
 	 * since DPDK does not force same CPU to be used for Rx/Tx.
-- 
2.20.1

[dpdk-dev] [PATCH v4 6/8] net/netvsc: handle transmit completions based on burst size

[Stephen Hemminger]

If tx_free_thresh is quite low, it is possible that we need to
cleanup based on burst size.

Fixes: fc30efe3a22e ("net/netvsc: change Rx descriptor setup and sizing")
Cc: stable@dpdk.org
Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
---
 drivers/net/netvsc/hn_rxtx.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/net/netvsc/hn_rxtx.c b/drivers/net/netvsc/hn_rxtx.c
index e8df84604202..cbdfcc628b75 100644
--- a/drivers/net/netvsc/hn_rxtx.c
+++ b/drivers/net/netvsc/hn_rxtx.c
@@ -1375,7 +1375,7 @@ hn_xmit_pkts(void *ptxq, struct rte_mbuf **tx_pkts, uint16_t nb_pkts)
 	struct hn_data *hv = txq->hv;
 	struct rte_eth_dev *vf_dev;
 	bool need_sig = false;
-	uint16_t nb_tx;
+	uint16_t nb_tx, avail;
 	int ret;
 
 	if (unlikely(hv->closed))
@@ -1390,7 +1390,8 @@ hn_xmit_pkts(void *ptxq, struct rte_mbuf **tx_pkts, uint16_t nb_pkts)
 		return (*vf_dev->tx_pkt_burst)(sub_q, tx_pkts, nb_pkts);
 	}
 
-	if (rte_mempool_avail_count(txq->txdesc_pool) <= txq->free_thresh)
+	avail = rte_mempool_avail_count(txq->txdesc_pool);
+	if (nb_pkts > avail || avail <= txq->free_thresh)
 		hn_process_events(hv, txq->queue_id, 0);
 
 	for (nb_tx = 0; nb_tx < nb_pkts; nb_tx++) {
-- 
2.20.1

[dpdk-dev] [PATCH v4 7/8] bus/vmbus: simplify args to need_signal

[Stephen Hemminger]

The transmit need signal function can avoid an unnecessary
dereference by passing the right pointer. This also makes
code better match FreeBSD driver.

Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
---
 drivers/bus/vmbus/vmbus_bufring.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/bus/vmbus/vmbus_bufring.c b/drivers/bus/vmbus/vmbus_bufring.c
index c88001605dbb..c4aa07b307ff 100644
--- a/drivers/bus/vmbus/vmbus_bufring.c
+++ b/drivers/bus/vmbus/vmbus_bufring.c
@@ -54,10 +54,10 @@ void vmbus_br_setup(struct vmbus_br *br, void *buf, unsigned int blen)
  *   data have arrived.
  */
 static inline bool
-vmbus_txbr_need_signal(const struct vmbus_br *tbr, uint32_t old_windex)
+vmbus_txbr_need_signal(const struct vmbus_bufring *vbr, uint32_t old_windex)
 {
 	rte_smp_mb();
-	if (tbr->vbr->imask)
+	if (vbr->imask)
 		return false;
 
 	rte_smp_rmb();
@@ -66,7 +66,7 @@ vmbus_txbr_need_signal(const struct vmbus_br *tbr, uint32_t old_windex)
 	 * This is the only case we need to signal when the
 	 * ring transitions from being empty to non-empty.
 	 */
-	return old_windex == tbr->vbr->rindex;
+	return old_windex == vbr->rindex;
 }
 
 static inline uint32_t
@@ -163,7 +163,7 @@ vmbus_txbr_write(struct vmbus_br *tbr, const struct iovec iov[], int iovlen,
 		rte_pause();
 
 	/* If host had read all data before this, then need to signal */
-	*need_sig |= vmbus_txbr_need_signal(tbr, old_windex);
+	*need_sig |= vmbus_txbr_need_signal(vbr, old_windex);
 	return 0;
 }
 
-- 
2.20.1

[dpdk-dev] [PATCH v4 8/8] net/netvsc: avoid possible live lock

[Stephen Hemminger]

Since the ring buffer with host is shared for both transmit
completions and receive packets, it is possible that transmitter
could get starved if receive ring gets full.

Better to process all outstanding events which frees up transmit
buffer slots, even if means dropping some packets.

Fixes: 7e6c82430702 ("net/netvsc: avoid over filling Rx descriptor ring")
Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
---
 drivers/net/netvsc/hn_rxtx.c | 3 ---
 1 file changed, 3 deletions(-)

diff --git a/drivers/net/netvsc/hn_rxtx.c b/drivers/net/netvsc/hn_rxtx.c
index cbdfcc628b75..19f00a05285f 100644
--- a/drivers/net/netvsc/hn_rxtx.c
+++ b/drivers/net/netvsc/hn_rxtx.c
@@ -1032,9 +1032,6 @@ uint32_t hn_process_events(struct hn_data *hv, uint16_t queue_id,
 
 		if (tx_limit && tx_done >= tx_limit)
 			break;
-
-		if (rxq->rx_ring && rte_ring_full(rxq->rx_ring))
-			break;
 	}
 
 	if (bytes_read > 0)
-- 
2.20.1

Re: [dpdk-dev] [PATCH v4 0/8] net/netvsc: bug fixes

[Ferruh Yigit]

On 3/31/2020 6:13 PM, Stephen Hemminger wrote:
> These are bug fixes for netvsc PMD mostly related to issues
> in the transmit ring discovered by users of multi-queue.
> 
> v4 - add more bug fixes
> v3 - fix checkpatch complaints
> v2 - simplify the locking on multi-channel setup
> 
> Stephen Hemminger (8):
>   net/netvsc: propagate descriptor limits from VF to netvsc
>   net/netvsc: handle receive packets during multi-channel setup
>   net/netvsc: split send buffers from transmit descriptors
>   net/netvsc: fix invalid rte_free on dev_close
>   net/netvsc: remove process event optimization
>   net/netvsc: handle transmit completions based on burst size
>   bus/vmbus: simplify args to need_signal
>   net/netvsc: avoid possible live lock

Series applied to dpdk-next-net/master, thanks.