[dpdk-dev] [PATCH v5 1/3] net/tap: add queue and port ids in Rx/Tx queues structures

[dpdk-dev] [PATCH v5 1/3] net/tap: add queue and port ids in Rx/Tx queues structures

[Raslan Darawsheh]

Signed-off-by: Raslan Darawsheh <rasland@mellanox.com>
---
 drivers/net/tap/rte_eth_tap.c | 3 +++
 drivers/net/tap/rte_eth_tap.h | 3 +++
 2 files changed, 6 insertions(+)

diff --git a/drivers/net/tap/rte_eth_tap.c b/drivers/net/tap/rte_eth_tap.c
index ad5ae98..edfb7da 100644
--- a/drivers/net/tap/rte_eth_tap.c
+++ b/drivers/net/tap/rte_eth_tap.c
@@ -1293,6 +1293,7 @@ tap_rx_queue_setup(struct rte_eth_dev *dev,
 	rxq->mp = mp;
 	rxq->trigger_seen = 1; /* force initial burst */
 	rxq->in_port = dev->data->port_id;
+	rxq->queue_id = rx_queue_id;
 	rxq->nb_rx_desc = nb_desc;
 	iovecs = rte_zmalloc_socket(dev->device->name, sizeof(*iovecs), 0,
 				    socket_id);
@@ -1359,6 +1360,8 @@ tap_tx_queue_setup(struct rte_eth_dev *dev,
 		return -1;
 	dev->data->tx_queues[tx_queue_id] = &internals->txq[tx_queue_id];
 	txq = dev->data->tx_queues[tx_queue_id];
+	txq->out_port = dev->data->port_id;
+	txq->queue_id = tx_queue_id;
 
 	offloads = tx_conf->offloads | dev->data->dev_conf.txmode.offloads;
 	txq->csum = !!(offloads &
diff --git a/drivers/net/tap/rte_eth_tap.h b/drivers/net/tap/rte_eth_tap.h
index 44e2773..4502e24 100644
--- a/drivers/net/tap/rte_eth_tap.h
+++ b/drivers/net/tap/rte_eth_tap.h
@@ -46,6 +46,7 @@ struct rx_queue {
 	struct rte_mempool *mp;         /* Mempool for RX packets */
 	uint32_t trigger_seen;          /* Last seen Rx trigger value */
 	uint16_t in_port;               /* Port ID */
+	uint16_t queue_id;		/* queue ID*/
 	int fd;
 	struct pkt_stats stats;         /* Stats for this RX queue */
 	uint16_t nb_rx_desc;            /* max number of mbufs available */
@@ -62,6 +63,8 @@ struct tx_queue {
 	uint16_t csum:1;                /* Enable checksum offloading */
 	struct pkt_stats stats;         /* Stats for this TX queue */
 	struct rte_gso_ctx gso_ctx;     /* GSO context */
+	uint16_t out_port;              /* Port ID */
+	uint16_t queue_id;		/* queue ID*/
 };
 
 struct pmd_internals {
-- 
2.7.4

[dpdk-dev] [PATCH v5 2/3] net/tap: move fds of Rx/Tx queues to be in process private

[Raslan Darawsheh]

fd's cannot be shared between processes, and each process need to have
it's own fd's pointer.

Signed-off-by: Raslan Darawsheh <rasland@mellanox.com>
---
 drivers/net/tap/rte_eth_tap.c | 93 +++++++++++++++++++++++++++++--------------
 drivers/net/tap/rte_eth_tap.h |  7 +++-
 drivers/net/tap/tap_flow.c    |  3 +-
 drivers/net/tap/tap_intr.c    |  5 ++-
 4 files changed, 73 insertions(+), 35 deletions(-)

diff --git a/drivers/net/tap/rte_eth_tap.c b/drivers/net/tap/rte_eth_tap.c
index edfb7da..3372d54 100644
--- a/drivers/net/tap/rte_eth_tap.c
+++ b/drivers/net/tap/rte_eth_tap.c
@@ -315,6 +315,7 @@ static uint16_t
 pmd_rx_burst(void *queue, struct rte_mbuf **bufs, uint16_t nb_pkts)
 {
 	struct rx_queue *rxq = queue;
+	struct pmd_process_private *process_private;
 	uint16_t num_rx;
 	unsigned long num_rx_bytes = 0;
 	uint32_t trigger = tap_trigger;
@@ -323,6 +324,7 @@ pmd_rx_burst(void *queue, struct rte_mbuf **bufs, uint16_t nb_pkts)
 		return 0;
 	if (trigger)
 		rxq->trigger_seen = trigger;
+	process_private = rte_eth_devices[rxq->in_port].process_private;
 	rte_compiler_barrier();
 	for (num_rx = 0; num_rx < nb_pkts; ) {
 		struct rte_mbuf *mbuf = rxq->pool;
@@ -331,9 +333,9 @@ pmd_rx_burst(void *queue, struct rte_mbuf **bufs, uint16_t nb_pkts)
 		uint16_t data_off = rte_pktmbuf_headroom(mbuf);
 		int len;
 
-		len = readv(rxq->fd, *rxq->iovecs,
-			    1 +
-			    (rxq->rxmode->offloads & DEV_RX_OFFLOAD_SCATTER ?
+		len = readv(process_private->rxq_fds[rxq->queue_id],
+			*rxq->iovecs,
+			1 + (rxq->rxmode->offloads & DEV_RX_OFFLOAD_SCATTER ?
 			     rxq->nb_rx_desc : 1));
 		if (len < (int)sizeof(struct tun_pi))
 			break;
@@ -494,6 +496,9 @@ tap_write_mbufs(struct tx_queue *txq, uint16_t num_mbufs,
 {
 	int i;
 	uint16_t l234_hlen;
+	struct pmd_process_private *process_private;
+
+	process_private = rte_eth_devices[txq->out_port].process_private;
 
 	for (i = 0; i < num_mbufs; i++) {
 		struct rte_mbuf *mbuf = pmbufs[i];
@@ -595,7 +600,7 @@ tap_write_mbufs(struct tx_queue *txq, uint16_t num_mbufs,
 			tap_tx_l4_cksum(l4_cksum, l4_phdr_cksum, l4_raw_cksum);
 
 		/* copy the tx frame data */
-		n = writev(txq->fd, iovecs, j);
+		n = writev(process_private->txq_fds[txq->queue_id], iovecs, j);
 		if (n <= 0)
 			break;
 		(*num_packets)++;
@@ -970,19 +975,20 @@ tap_dev_close(struct rte_eth_dev *dev)
 {
 	int i;
 	struct pmd_internals *internals = dev->data->dev_private;
+	struct pmd_process_private *process_private = dev->process_private;
 
 	tap_link_set_down(dev);
 	tap_flow_flush(dev, NULL);
 	tap_flow_implicit_flush(internals, NULL);
 
 	for (i = 0; i < RTE_PMD_TAP_MAX_QUEUES; i++) {
-		if (internals->rxq[i].fd != -1) {
-			close(internals->rxq[i].fd);
-			internals->rxq[i].fd = -1;
+		if (process_private->rxq_fds[i] != -1) {
+			close(process_private->rxq_fds[i]);
+			process_private->rxq_fds[i] = -1;
 		}
-		if (internals->txq[i].fd != -1) {
-			close(internals->txq[i].fd);
-			internals->txq[i].fd = -1;
+		if (process_private->txq_fds[i] != -1) {
+			close(process_private->txq_fds[i]);
+			process_private->txq_fds[i] = -1;
 		}
 	}
 
@@ -1006,10 +1012,14 @@ static void
 tap_rx_queue_release(void *queue)
 {
 	struct rx_queue *rxq = queue;
+	struct pmd_process_private *process_private;
 
-	if (rxq && (rxq->fd > 0)) {
-		close(rxq->fd);
-		rxq->fd = -1;
+	if (!rxq)
+		return;
+	process_private = rte_eth_devices[rxq->in_port].process_private;
+	if (process_private->rxq_fds[rxq->queue_id] > 0) {
+		close(process_private->rxq_fds[rxq->queue_id]);
+		process_private->rxq_fds[rxq->queue_id] = -1;
 		rte_pktmbuf_free(rxq->pool);
 		rte_free(rxq->iovecs);
 		rxq->pool = NULL;
@@ -1021,10 +1031,15 @@ static void
 tap_tx_queue_release(void *queue)
 {
 	struct tx_queue *txq = queue;
+	struct pmd_process_private *process_private;
+
+	if (!txq)
+		return;
+	process_private = rte_eth_devices[txq->out_port].process_private;
 
-	if (txq && (txq->fd > 0)) {
-		close(txq->fd);
-		txq->fd = -1;
+	if (process_private->txq_fds[txq->queue_id] > 0) {
+		close(process_private->txq_fds[txq->queue_id]);
+		process_private->txq_fds[txq->queue_id] = -1;
 	}
 }
 
@@ -1209,18 +1224,19 @@ tap_setup_queue(struct rte_eth_dev *dev,
 	int *other_fd;
 	const char *dir;
 	struct pmd_internals *pmd = dev->data->dev_private;
+	struct pmd_process_private *process_private = dev->process_private;
 	struct rx_queue *rx = &internals->rxq[qid];
 	struct tx_queue *tx = &internals->txq[qid];
 	struct rte_gso_ctx *gso_ctx;
 
 	if (is_rx) {
-		fd = &rx->fd;
-		other_fd = &tx->fd;
+		fd = &process_private->rxq_fds[qid];
+		other_fd = &process_private->txq_fds[qid];
 		dir = "rx";
 		gso_ctx = NULL;
 	} else {
-		fd = &tx->fd;
-		other_fd = &rx->fd;
+		fd = &process_private->txq_fds[qid];
+		other_fd = &process_private->rxq_fds[qid];
 		dir = "tx";
 		gso_ctx = &tx->gso_ctx;
 	}
@@ -1273,6 +1289,7 @@ tap_rx_queue_setup(struct rte_eth_dev *dev,
 		   struct rte_mempool *mp)
 {
 	struct pmd_internals *internals = dev->data->dev_private;
+	struct pmd_process_private *process_private = dev->process_private;
 	struct rx_queue *rxq = &internals->rxq[rx_queue_id];
 	struct rte_mbuf **tmp = &rxq->pool;
 	long iov_max = sysconf(_SC_IOV_MAX);
@@ -1332,7 +1349,8 @@ tap_rx_queue_setup(struct rte_eth_dev *dev,
 	}
 
 	TAP_LOG(DEBUG, "  RX TUNTAP device name %s, qid %d on fd %d",
-		internals->name, rx_queue_id, internals->rxq[rx_queue_id].fd);
+		internals->name, rx_queue_id,
+		process_private->rxq_fds[rx_queue_id]);
 
 	return 0;
 
@@ -1352,6 +1370,7 @@ tap_tx_queue_setup(struct rte_eth_dev *dev,
 		   const struct rte_eth_txconf *tx_conf)
 {
 	struct pmd_internals *internals = dev->data->dev_private;
+	struct pmd_process_private *process_private = dev->process_private;
 	struct tx_queue *txq;
 	int ret;
 	uint64_t offloads;
@@ -1374,7 +1393,8 @@ tap_tx_queue_setup(struct rte_eth_dev *dev,
 		return -1;
 	TAP_LOG(DEBUG,
 		"  TX TUNTAP device name %s, qid %d on fd %d csum %s",
-		internals->name, tx_queue_id, internals->txq[tx_queue_id].fd,
+		internals->name, tx_queue_id,
+		process_private->txq_fds[tx_queue_id],
 		txq->csum ? "on" : "off");
 
 	return 0;
@@ -1622,6 +1642,7 @@ eth_dev_tap_create(struct rte_vdev_device *vdev, char *tap_name,
 	int numa_node = rte_socket_id();
 	struct rte_eth_dev *dev;
 	struct pmd_internals *pmd;
+	struct pmd_process_private *process_private;
 	struct rte_eth_dev_data *data;
 	struct ifreq ifr;
 	int i;
@@ -1636,7 +1657,16 @@ eth_dev_tap_create(struct rte_vdev_device *vdev, char *tap_name,
 		goto error_exit_nodev;
 	}
 
+	process_private = (struct pmd_process_private *)
+		rte_zmalloc_socket(tap_name, sizeof(struct pmd_process_private),
+			RTE_CACHE_LINE_SIZE, dev->device->numa_node);
+
+	if (process_private == NULL) {
+		TAP_LOG(ERR, "Failed to alloc memory for process private");
+		return -1;
+	}
 	pmd = dev->data->dev_private;
+	dev->process_private = process_private;
 	pmd->dev = dev;
 	snprintf(pmd->name, sizeof(pmd->name), "%s", tap_name);
 	pmd->type = type;
@@ -1672,8 +1702,8 @@ eth_dev_tap_create(struct rte_vdev_device *vdev, char *tap_name,
 	/* Presetup the fds to -1 as being not valid */
 	pmd->ka_fd = -1;
 	for (i = 0; i < RTE_PMD_TAP_MAX_QUEUES; i++) {
-		pmd->rxq[i].fd = -1;
-		pmd->txq[i].fd = -1;
+		process_private->rxq_fds[i] = -1;
+		process_private->txq_fds[i] = -1;
 	}
 
 	if (pmd->type == ETH_TUNTAP_TYPE_TAP) {
@@ -2073,6 +2103,7 @@ rte_pmd_tap_remove(struct rte_vdev_device *dev)
 {
 	struct rte_eth_dev *eth_dev = NULL;
 	struct pmd_internals *internals;
+	struct pmd_process_private *process_private;
 	int i;
 
 	/* find the ethdev entry */
@@ -2081,6 +2112,7 @@ rte_pmd_tap_remove(struct rte_vdev_device *dev)
 		return 0;
 
 	internals = eth_dev->data->dev_private;
+	process_private = eth_dev->process_private;
 
 	TAP_LOG(DEBUG, "Closing %s Ethernet device on numa %u",
 		(internals->type == ETH_TUNTAP_TYPE_TAP) ? "TAP" : "TUN",
@@ -2092,18 +2124,19 @@ rte_pmd_tap_remove(struct rte_vdev_device *dev)
 		tap_nl_final(internals->nlsk_fd);
 	}
 	for (i = 0; i < RTE_PMD_TAP_MAX_QUEUES; i++) {
-		if (internals->rxq[i].fd != -1) {
-			close(internals->rxq[i].fd);
-			internals->rxq[i].fd = -1;
+		if (process_private->rxq_fds[i] != -1) {
+			close(process_private->rxq_fds[i]);
+			process_private->rxq_fds[i] = -1;
 		}
-		if (internals->txq[i].fd != -1) {
-			close(internals->txq[i].fd);
-			internals->txq[i].fd = -1;
+		if (process_private->txq_fds[i] != -1) {
+			close(process_private->txq_fds[i]);
+			process_private->txq_fds[i] = -1;
 		}
 	}
 
 	close(internals->ioctl_sock);
 	rte_free(eth_dev->data->dev_private);
+	rte_free(eth_dev->process_private);
 	rte_eth_dev_release_port(eth_dev);
 
 	if (internals->ka_fd != -1) {
diff --git a/drivers/net/tap/rte_eth_tap.h b/drivers/net/tap/rte_eth_tap.h
index 4502e24..dc3579a 100644
--- a/drivers/net/tap/rte_eth_tap.h
+++ b/drivers/net/tap/rte_eth_tap.h
@@ -47,7 +47,6 @@ struct rx_queue {
 	uint32_t trigger_seen;          /* Last seen Rx trigger value */
 	uint16_t in_port;               /* Port ID */
 	uint16_t queue_id;		/* queue ID*/
-	int fd;
 	struct pkt_stats stats;         /* Stats for this RX queue */
 	uint16_t nb_rx_desc;            /* max number of mbufs available */
 	struct rte_eth_rxmode *rxmode;  /* RX features */
@@ -57,7 +56,6 @@ struct rx_queue {
 };
 
 struct tx_queue {
-	int fd;
 	int type;                       /* Type field - TUN|TAP */
 	uint16_t *mtu;                  /* Pointer to MTU from dev_data */
 	uint16_t csum:1;                /* Enable checksum offloading */
@@ -95,6 +93,11 @@ struct pmd_internals {
 	int ka_fd;                        /* keep-alive file descriptor */
 };
 
+struct pmd_process_private {
+	int rxq_fds[RTE_PMD_TAP_MAX_QUEUES];
+	int txq_fds[RTE_PMD_TAP_MAX_QUEUES];
+};
+
 /* tap_intr.c */
 
 int tap_rx_intr_vec_set(struct rte_eth_dev *dev, int set);
diff --git a/drivers/net/tap/tap_flow.c b/drivers/net/tap/tap_flow.c
index 0e01af6..3ba6945 100644
--- a/drivers/net/tap/tap_flow.c
+++ b/drivers/net/tap/tap_flow.c
@@ -1567,6 +1567,7 @@ tap_flow_isolate(struct rte_eth_dev *dev,
 		 struct rte_flow_error *error __rte_unused)
 {
 	struct pmd_internals *pmd = dev->data->dev_private;
+	struct pmd_process_private *process_private = dev->process_private;
 
 	/* normalize 'set' variable to contain 0 or 1 values */
 	if (set)
@@ -1580,7 +1581,7 @@ tap_flow_isolate(struct rte_eth_dev *dev,
 	 * If netdevice is there, setup appropriate flow rules immediately.
 	 * Otherwise it will be set when bringing up the netdevice (tun_alloc).
 	 */
-	if (!pmd->rxq[0].fd)
+	if (!process_private->rxq_fds[0])
 		return 0;
 	if (set) {
 		struct rte_flow *remote_flow;
diff --git a/drivers/net/tap/tap_intr.c b/drivers/net/tap/tap_intr.c
index fc59018..7af0010 100644
--- a/drivers/net/tap/tap_intr.c
+++ b/drivers/net/tap/tap_intr.c
@@ -51,6 +51,7 @@ static int
 tap_rx_intr_vec_install(struct rte_eth_dev *dev)
 {
 	struct pmd_internals *pmd = dev->data->dev_private;
+	struct pmd_process_private *process_private = dev->process_private;
 	unsigned int rxqs_n = pmd->dev->data->nb_rx_queues;
 	struct rte_intr_handle *intr_handle = &pmd->intr_handle;
 	unsigned int n = RTE_MIN(rxqs_n, (uint32_t)RTE_MAX_RXTX_INTR_VEC_ID);
@@ -71,7 +72,7 @@ tap_rx_intr_vec_install(struct rte_eth_dev *dev)
 		struct rx_queue *rxq = pmd->dev->data->rx_queues[i];
 
 		/* Skip queues that cannot request interrupts. */
-		if (!rxq || rxq->fd <= 0) {
+		if (!rxq || process_private->rxq_fds[i] <= 0) {
 			/* Use invalid intr_vec[] index to disable entry. */
 			intr_handle->intr_vec[i] =
 				RTE_INTR_VEC_RXTX_OFFSET +
@@ -79,7 +80,7 @@ tap_rx_intr_vec_install(struct rte_eth_dev *dev)
 			continue;
 		}
 		intr_handle->intr_vec[i] = RTE_INTR_VEC_RXTX_OFFSET + count;
-		intr_handle->efds[count] = rxq->fd;
+		intr_handle->efds[count] = process_private->rxq_fds[i];
 		count++;
 	}
 	if (!count)
-- 
2.7.4

[dpdk-dev] [PATCH v5 3/3] net/tap: add queues when attaching from secondary process

[Raslan Darawsheh]

In the case the device is created by the primary process,
the secondary must request some file descriptors to attach the queues.
The file descriptors are shared via IPC Unix socket.

Thanks to the IPC synchronization, the secondary process
is now able to do Rx/Tx on a TAP created by the primary process.

Signed-off-by: Raslan Darawsheh <rasland@mellanox.com>
Signed-off-by: Thomas Monjalon <thomas@monjalon.net>

---
    v2:
       - translate file descriptors via IPC API
       - add documentation
    v3:
       - rabse the commit
       - use private static array for fd's to be local for each process

    v4:
       - removed TODO and FIXME tags
       - used strlcpy instead of strcpy

    v5: rebase the commit on top of Alejandro Lucero patch for secondary
        process private pointer.
        http://patches.dpdk.org/patch/46185/

---
---
 doc/guides/nics/tap.rst                |  16 ++++
 doc/guides/rel_notes/release_18_11.rst |   5 ++
 drivers/net/tap/Makefile               |   1 +
 drivers/net/tap/meson.build            |   1 +
 drivers/net/tap/rte_eth_tap.c          | 147 ++++++++++++++++++++++++++++++++-
 5 files changed, 169 insertions(+), 1 deletion(-)

diff --git a/doc/guides/nics/tap.rst b/doc/guides/nics/tap.rst
index 2714868..9a3d7b3 100644
--- a/doc/guides/nics/tap.rst
+++ b/doc/guides/nics/tap.rst
@@ -152,6 +152,22 @@ Distribute IPv4 TCP packets using RSS to a given MAC address over queues 0-3::
    testpmd> flow create 0 priority 4 ingress pattern eth dst is 0a:0b:0c:0d:0e:0f \
             / ipv4 / tcp / end actions rss queues 0 1 2 3 end / end
 
+Multi-process sharing
+---------------------
+
+It is possible to attach an existing TAP device in a secondary process,
+by declaring it as a vdev with the same name as in the primary process,
+and without any parameter.
+
+The port attached in a secondary process will give access to the
+statistics and the queues.
+Therefore it can be used for monitoring or Rx/Tx processing.
+
+The IPC synchronization of Rx/Tx queues is currently limited:
+
+  - Maximum 8 queues shared
+  - Synchronized on probing, but not on later port update
+
 Example
 -------
 
diff --git a/doc/guides/rel_notes/release_18_11.rst b/doc/guides/rel_notes/release_18_11.rst
index 2133a5b..3240b52 100644
--- a/doc/guides/rel_notes/release_18_11.rst
+++ b/doc/guides/rel_notes/release_18_11.rst
@@ -104,6 +104,11 @@ New Features
   the specified port. The port must be stopped before the command call in order
   to reconfigure queues.
 
+* **Added TAP Rx/Tx queues sharing with a secondary process.**
+
+  A secondary process can attach a TAP device created in the primary process,
+  probe the queues, and process Rx/Tx in a secondary process.
+
 
 API Changes
 -----------
diff --git a/drivers/net/tap/Makefile b/drivers/net/tap/Makefile
index 3243365..7748283 100644
--- a/drivers/net/tap/Makefile
+++ b/drivers/net/tap/Makefile
@@ -22,6 +22,7 @@ CFLAGS += -O3
 CFLAGS += -I$(SRCDIR)
 CFLAGS += -I.
 CFLAGS += $(WERROR_FLAGS)
+CFLAGS += -DALLOW_EXPERIMENTAL_API
 LDLIBS += -lrte_eal -lrte_mbuf -lrte_mempool -lrte_ring
 LDLIBS += -lrte_ethdev -lrte_net -lrte_kvargs -lrte_hash
 LDLIBS += -lrte_bus_vdev -lrte_gso
diff --git a/drivers/net/tap/meson.build b/drivers/net/tap/meson.build
index 37f65b7..f7e8852 100644
--- a/drivers/net/tap/meson.build
+++ b/drivers/net/tap/meson.build
@@ -35,6 +35,7 @@ args = [
 	  'TCA_ACT_BPF_FD' ],
 ]
 config = configuration_data()
+allow_experimental_apis = true
 foreach arg:args
 	config.set(arg[0], cc.has_header_symbol(arg[1], arg[2]))
 endforeach
diff --git a/drivers/net/tap/rte_eth_tap.c b/drivers/net/tap/rte_eth_tap.c
index 3372d54..83c9288 100644
--- a/drivers/net/tap/rte_eth_tap.c
+++ b/drivers/net/tap/rte_eth_tap.c
@@ -16,6 +16,8 @@
 #include <rte_debug.h>
 #include <rte_ip.h>
 #include <rte_string_fns.h>
+#include <rte_ethdev.h>
+#include <rte_errno.h>
 
 #include <assert.h>
 #include <sys/types.h>
@@ -62,6 +64,10 @@
 #define TAP_GSO_MBUFS_NUM \
 	(TAP_GSO_MBUFS_PER_CORE * TAP_GSO_MBUF_CACHE_SIZE)
 
+/* IPC key for queue fds sync */
+#define TAP_MP_KEY "tap_mp_sync_queues"
+
+static int tap_devices_count;
 static struct rte_vdev_driver pmd_tap_drv;
 static struct rte_vdev_driver pmd_tun_drv;
 
@@ -100,6 +106,17 @@ enum ioctl_mode {
 	REMOTE_ONLY,
 };
 
+/* Message header to synchronize queues via IPC */
+struct ipc_queues {
+	char port_name[RTE_DEV_NAME_MAX_LEN];
+	int rxq_count;
+	int txq_count;
+	/*
+	 * The file descriptors are in the dedicated part
+	 * of the Unix message to be translated by the kernel.
+	 */
+};
+
 static int tap_intr_handle_set(struct rte_eth_dev *dev, int set);
 
 /**
@@ -2006,6 +2023,102 @@ rte_pmd_tun_probe(struct rte_vdev_device *dev)
 	return ret;
 }
 
+/* Request queue file descriptors from secondary to primary. */
+static int
+tap_mp_attach_queues(const char *port_name, struct rte_eth_dev *dev)
+{
+	int ret;
+	struct timespec timeout = {.tv_sec = 1, .tv_nsec = 0};
+	struct rte_mp_msg request, *reply;
+	struct rte_mp_reply replies;
+	struct ipc_queues *request_param = (struct ipc_queues *)request.param;
+	struct ipc_queues *reply_param;
+	struct pmd_process_private *process_private = dev->process_private;
+	int queue, fd_iterator;
+
+	/* Prepare the request */
+	strlcpy(request.name, TAP_MP_KEY, sizeof(request.name));
+	strlcpy(request_param->port_name, port_name,
+		sizeof(request_param->port_name));
+	request.len_param = sizeof(*request_param);
+	/* Send request and receive reply */
+	ret = rte_mp_request_sync(&request, &replies, &timeout);
+	if (ret < 0) {
+		TAP_LOG(ERR, "Failed to request queues from primary: %d",
+			rte_errno);
+		return -1;
+	}
+	reply = &replies.msgs[0];
+	reply_param = (struct ipc_queues *)reply->param;
+	TAP_LOG(DEBUG, "Received IPC reply for %s", reply_param->port_name);
+
+	/* Attach the queues from received file descriptors */
+	dev->data->nb_rx_queues = reply_param->rxq_count;
+	dev->data->nb_tx_queues = reply_param->txq_count;
+	fd_iterator = 0;
+	for (queue = 0; queue < reply_param->rxq_count; queue++)
+		process_private->rxq_fds[queue] = reply->fds[fd_iterator++];
+	for (queue = 0; queue < reply_param->txq_count; queue++)
+		process_private->txq_fds[queue] = reply->fds[fd_iterator++];
+
+	return 0;
+}
+
+/* Send the queue file descriptors from the primary process to secondary. */
+static int
+tap_mp_sync_queues(const struct rte_mp_msg *request, const void *peer)
+{
+	struct rte_eth_dev *dev;
+	struct pmd_process_private *process_private;
+	struct rte_mp_msg reply;
+	const struct ipc_queues *request_param =
+		(const struct ipc_queues *)request->param;
+	struct ipc_queues *reply_param =
+		(struct ipc_queues *)reply.param;
+	uint16_t port_id;
+	int queue;
+	int ret;
+
+	/* Get requested port */
+	TAP_LOG(DEBUG, "Received IPC request for %s", request_param->port_name);
+	ret = rte_eth_dev_get_port_by_name(request_param->port_name, &port_id);
+	if (ret) {
+		TAP_LOG(ERR, "Failed to get port id for %s",
+			request_param->port_name);
+		return -1;
+	}
+	dev = &rte_eth_devices[port_id];
+	process_private = dev->process_private;
+
+	/* Fill file descriptors for all queues */
+	reply.num_fds = 0;
+	reply_param->rxq_count = 0;
+	for (queue = 0; queue < dev->data->nb_rx_queues; queue++) {
+		reply.fds[reply.num_fds++] = process_private->rxq_fds[queue];
+		reply_param->rxq_count++;
+	}
+	RTE_ASSERT(reply_param->rxq_count == dev->data->nb_rx_queues);
+	RTE_ASSERT(reply_param->txq_count == dev->data->nb_tx_queues);
+	RTE_ASSERT(reply.num_fds <= RTE_MP_MAX_FD_NUM);
+
+	reply_param->txq_count = 0;
+	for (queue = 0; queue < dev->data->nb_tx_queues; queue++) {
+		reply.fds[reply.num_fds++] = process_private->txq_fds[queue];
+		reply_param->txq_count++;
+	}
+
+	/* Send reply */
+	strlcpy(reply.name, request->name, sizeof(reply.name));
+	strlcpy(reply_param->port_name, request_param->port_name,
+		sizeof(reply_param->port_name));
+	reply.len_param = sizeof(*reply_param);
+	if (rte_mp_reply(&reply, peer) < 0) {
+		TAP_LOG(ERR, "Failed to reply an IPC request to sync queues");
+		return -1;
+	}
+	return 0;
+}
+
 /* Open a TAP interface device.
  */
 static int
@@ -2032,9 +2145,28 @@ rte_pmd_tap_probe(struct rte_vdev_device *dev)
 			TAP_LOG(ERR, "Failed to probe %s", name);
 			return -1;
 		}
-		/* TODO: request info from primary to set up Rx and Tx */
 		eth_dev->dev_ops = &ops;
 		eth_dev->device = &dev->device;
+		eth_dev->rx_pkt_burst = pmd_rx_burst;
+		eth_dev->tx_pkt_burst = pmd_tx_burst;
+		if (!rte_eal_primary_proc_alive(NULL)) {
+			TAP_LOG(ERR, "Primary process is missing");
+			return -1;
+		}
+		eth_dev->process_private = (struct pmd_process_private *)
+			rte_zmalloc_socket(name,
+				sizeof(struct pmd_process_private),
+				RTE_CACHE_LINE_SIZE,
+				eth_dev->device->numa_node);
+		if (eth_dev->process_private == NULL) {
+			TAP_LOG(ERR,
+				"Failed to alloc memory for process private");
+			return -1;
+		}
+
+		ret = tap_mp_attach_queues(name, eth_dev);
+		if (ret != 0)
+			return -1;
 		rte_eth_dev_probing_finish(eth_dev);
 		return 0;
 	}
@@ -2082,6 +2214,14 @@ rte_pmd_tap_probe(struct rte_vdev_device *dev)
 	TAP_LOG(NOTICE, "Initializing pmd_tap for %s as %s",
 		name, tap_name);
 
+	/* Register IPC feed callback */
+	ret = rte_mp_action_register(TAP_MP_KEY, tap_mp_sync_queues);
+	if (ret < 0 && rte_errno != EEXIST && tap_devices_count) {
+		TAP_LOG(ERR, "%s: Failed to register IPC callback: %s",
+			tuntap_name, strerror(rte_errno));
+		goto leave;
+	}
+	tap_devices_count++;
 	ret = eth_dev_tap_create(dev, tap_name, remote_iface, &user_mac,
 		ETH_TUNTAP_TYPE_TAP);
 
@@ -2089,6 +2229,8 @@ rte_pmd_tap_probe(struct rte_vdev_device *dev)
 	if (ret == -1) {
 		TAP_LOG(ERR, "Failed to create pmd for %s as %s",
 			name, tap_name);
+		if (!tap_devices_count)
+			rte_mp_action_unregister(TAP_MP_KEY);
 		tap_unit--;		/* Restore the unit number */
 	}
 	rte_kvargs_free(kvlist);
@@ -2137,6 +2279,9 @@ rte_pmd_tap_remove(struct rte_vdev_device *dev)
 	close(internals->ioctl_sock);
 	rte_free(eth_dev->data->dev_private);
 	rte_free(eth_dev->process_private);
+	if (tap_devices_count == 1)
+		rte_mp_action_unregister(TAP_MP_KEY);
+	tap_devices_count--;
 	rte_eth_dev_release_port(eth_dev);
 
 	if (internals->ka_fd != -1) {
-- 
2.7.4

Re: [dpdk-dev] [PATCH v5 3/3] net/tap: add queues when attaching from secondary process

[Wiles, Keith]

> On Oct 10, 2018, at 2:03 AM, Raslan Darawsheh <rasland@mellanox.com> wrote:
> 
> In the case the device is created by the primary process,
> the secondary must request some file descriptors to attach the queues.
> The file descriptors are shared via IPC Unix socket.
> 
> Thanks to the IPC synchronization, the secondary process
> is now able to do Rx/Tx on a TAP created by the primary process.
> 
> Signed-off-by: Raslan Darawsheh <rasland@mellanox.com>
> Signed-off-by: Thomas Monjalon <thomas@monjalon.net>
> 
> ---
>    v2:
>       - translate file descriptors via IPC API
>       - add documentation
>    v3:
>       - rabse the commit
>       - use private static array for fd's to be local for each process
> 
>    v4:
>       - removed TODO and FIXME tags
>       - used strlcpy instead of strcpy
> 
>    v5: rebase the commit on top of Alejandro Lucero patch for secondary
>        process private pointer.
>        http://patches.dpdk.org/patch/46185/
> 
Maybe the patch title could be better,

net/tap: allow secondary process to access primary TAP device queues

Maybe we can just have the title changed at apply time and not require a new patch.

Regards,
Keith

Re: [dpdk-dev] [PATCH v5 1/3] net/tap: add queue and port ids in Rx/Tx queues structures

[Wiles, Keith]

> On Oct 10, 2018, at 2:03 AM, Raslan Darawsheh <rasland@mellanox.com> wrote:
> 
> Signed-off-by: Raslan Darawsheh <rasland@mellanox.com>

This title for the patch is the what we did not why we did it, should that be changed? To me it does not convey the reason or we would need to add a more complete comment body text to explain why we wanted the change. It is a bit of nit picking.

> ---
> drivers/net/tap/rte_eth_tap.c | 3 +++
> drivers/net/tap/rte_eth_tap.h | 3 +++
> 2 files changed, 6 insertions(+)
> 
> diff --git a/drivers/net/tap/rte_eth_tap.c b/drivers/net/tap/rte_eth_tap.c
> index ad5ae98..edfb7da 100644
> --- a/drivers/net/tap/rte_eth_tap.c
> +++ b/drivers/net/tap/rte_eth_tap.c
> @@ -1293,6 +1293,7 @@ tap_rx_queue_setup(struct rte_eth_dev *dev,
> 	rxq->mp = mp;
> 	rxq->trigger_seen = 1; /* force initial burst */
> 	rxq->in_port = dev->data->port_id;
> +	rxq->queue_id = rx_queue_id;
> 	rxq->nb_rx_desc = nb_desc;
> 	iovecs = rte_zmalloc_socket(dev->device->name, sizeof(*iovecs), 0,
> 				    socket_id);
> @@ -1359,6 +1360,8 @@ tap_tx_queue_setup(struct rte_eth_dev *dev,
> 		return -1;
> 	dev->data->tx_queues[tx_queue_id] = &internals->txq[tx_queue_id];
> 	txq = dev->data->tx_queues[tx_queue_id];
> +	txq->out_port = dev->data->port_id;
> +	txq->queue_id = tx_queue_id;
> 
> 	offloads = tx_conf->offloads | dev->data->dev_conf.txmode.offloads;
> 	txq->csum = !!(offloads &
> diff --git a/drivers/net/tap/rte_eth_tap.h b/drivers/net/tap/rte_eth_tap.h
> index 44e2773..4502e24 100644
> --- a/drivers/net/tap/rte_eth_tap.h
> +++ b/drivers/net/tap/rte_eth_tap.h
> @@ -46,6 +46,7 @@ struct rx_queue {
> 	struct rte_mempool *mp;         /* Mempool for RX packets */
> 	uint32_t trigger_seen;          /* Last seen Rx trigger value */
> 	uint16_t in_port;               /* Port ID */
> +	uint16_t queue_id;		/* queue ID*/
> 	int fd;
> 	struct pkt_stats stats;         /* Stats for this RX queue */
> 	uint16_t nb_rx_desc;            /* max number of mbufs available */
> @@ -62,6 +63,8 @@ struct tx_queue {
> 	uint16_t csum:1;                /* Enable checksum offloading */
> 	struct pkt_stats stats;         /* Stats for this TX queue */
> 	struct rte_gso_ctx gso_ctx;     /* GSO context */
> +	uint16_t out_port;              /* Port ID */
> +	uint16_t queue_id;		/* queue ID*/
> };
> 
> struct pmd_internals {
> -- 
> 2.7.4
> 

Regards,
Keith

Re: [dpdk-dev] [PATCH v5 1/3] net/tap: add queue and port ids in Rx/Tx queues structures

[Thomas Monjalon]

10/10/2018 14:50, Wiles, Keith:
> 
> > On Oct 10, 2018, at 2:03 AM, Raslan Darawsheh <rasland@mellanox.com> wrote:
> > 
> > Signed-off-by: Raslan Darawsheh <rasland@mellanox.com>
> 
> This title for the patch is the what we did not why we did it, should that be changed? To me it does not convey the reason or we would need to add a more complete comment body text to explain why we wanted the change. It is a bit of nit picking.

I think the question "why" must be answered in the body.

Re: [dpdk-dev] [PATCH v5 3/3] net/tap: add queues when attaching from secondary process

[Raslan Darawsheh]

Just sent a new Version with the commit log reworded as mentioned. 

Kindest regards,
Raslan Darawsheh

> -----Original Message-----
> From: Wiles, Keith <keith.wiles@intel.com>
> Sent: Wednesday, October 10, 2018 3:48 PM
> To: Raslan Darawsheh <rasland@mellanox.com>
> Cc: Thomas Monjalon <thomas@monjalon.net>; dev@dpdk.org; Shahaf
> Shuler <shahafs@mellanox.com>; Ori Kam <orika@mellanox.com>; Yigit,
> Ferruh <ferruh.yigit@intel.com>
> Subject: Re: [PATCH v5 3/3] net/tap: add queues when attaching from
> secondary process
> 
> 
> 
> > On Oct 10, 2018, at 2:03 AM, Raslan Darawsheh <rasland@mellanox.com>
> wrote:
> >
> > In the case the device is created by the primary process, the
> > secondary must request some file descriptors to attach the queues.
> > The file descriptors are shared via IPC Unix socket.
> >
> > Thanks to the IPC synchronization, the secondary process is now able
> > to do Rx/Tx on a TAP created by the primary process.
> >
> > Signed-off-by: Raslan Darawsheh <rasland@mellanox.com>
> > Signed-off-by: Thomas Monjalon <thomas@monjalon.net>
> >
> > ---
> >    v2:
> >       - translate file descriptors via IPC API
> >       - add documentation
> >    v3:
> >       - rabse the commit
> >       - use private static array for fd's to be local for each process
> >
> >    v4:
> >       - removed TODO and FIXME tags
> >       - used strlcpy instead of strcpy
> >
> >    v5: rebase the commit on top of Alejandro Lucero patch for secondary
> >        process private pointer.
> >
> >
> https://emea01.safelinks.protection.outlook.com/?url=http%3A%2F%2Fpatc
> >
> hes.dpdk.org%2Fpatch%2F46185%2F&amp;data=02%7C01%7Crasland%40me
> llanox.
> >
> com%7Ccfacb17302174d9f4d4608d62eae9952%7Ca652971c7d2e4d9ba6a4d14
> 9256f4
> >
> 61b%7C0%7C0%7C636747724769870635&amp;sdata=ascg78Cv3PhUY1blcdUi
> QHh1mmJ
> > JZ2rD5pFUnoEzH9Q%3D&amp;reserved=0
> >
> Maybe the patch title could be better,
> 
> net/tap: allow secondary process to access primary TAP device queues
> 
> Maybe we can just have the title changed at apply time and not require a
> new patch.
> 
> Regards,
> Keith

Re: [dpdk-dev] [PATCH v5 1/3] net/tap: add queue and port ids in Rx/Tx queues structures

[Raslan Darawsheh]

Hi,

Just sent a new version with the commit log reworded to answer the "why" question you mentioned.
Thx for your reviews.

Kindest regards,
Raslan Darawsheh

> -----Original Message-----
> From: Thomas Monjalon <thomas@monjalon.net>
> Sent: Wednesday, October 10, 2018 5:08 PM
> To: Wiles, Keith <keith.wiles@intel.com>; Raslan Darawsheh
> <rasland@mellanox.com>
> Cc: dev@dpdk.org; Shahaf Shuler <shahafs@mellanox.com>; Ori Kam
> <orika@mellanox.com>; Yigit, Ferruh <ferruh.yigit@intel.com>
> Subject: Re: [PATCH v5 1/3] net/tap: add queue and port ids in Rx/Tx queues
> structures
> 
> 10/10/2018 14:50, Wiles, Keith:
> >
> > > On Oct 10, 2018, at 2:03 AM, Raslan Darawsheh <rasland@mellanox.com>
> wrote:
> > >
> > > Signed-off-by: Raslan Darawsheh <rasland@mellanox.com>
> >
> > This title for the patch is the what we did not why we did it, should that be
> changed? To me it does not convey the reason or we would need to add a
> more complete comment body text to explain why we wanted the change. It
> is a bit of nit picking.
> 
> I think the question "why" must be answered in the body.
> 
>