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* [dpdk-dev] [RFC] librte_pmd_packet: add PMD for AF_PACKET-based virtual devices
@ 2014-06-06 19:25 John W. Linville
  2014-06-06 19:47 ` Chris Wright
  2014-06-06 20:30 ` Neil Horman
  0 siblings, 2 replies; 8+ messages in thread
From: John W. Linville @ 2014-06-06 19:25 UTC (permalink / raw)
  To: dev

This is a Linux-specific virtual PMD driver backed by an AF_PACKET
socket.  The current implementation uses mmap'ed ring buffers to
limit copying and user/kernel transitions.  The intent is also to take
advantage of fanout and any future AF_PACKET optimizations as well.

This is intended to provide a means for using DPDK on a broad range
of hardware without hardware-specifi PMDs and hopefully with better
performance than what PCAP offers in Linux.  This might be useful
as a development platform for DPDK applications when DPDK-supported
hardware is expensive or unavailable.

Signed-off-by: John W. Linville <linville@tuxdriver.com>
---
I've been toying with this for a while without a lot of progress.
I was about to post the original RFC patch just as the PMD
initialization flows got rewritten.  I set this down while that was
settling-out, and only just recently got back to it.

Anyway, I figure it is better to get this out now and let people
comment on it and/or get some use out of it if they can.  I have
posted this as RFC as it has only had very limited testing locally
and I'm sure it still could use some clean-ups and improvements
(like parameterizing block/frame size/count).

 config/common_bsdapp                   |   5 +
 config/common_linuxapp                 |   5 +
 lib/Makefile                           |   1 +
 lib/librte_eal/linuxapp/eal/Makefile   |   1 +
 lib/librte_pmd_packet/Makefile         |  60 +++
 lib/librte_pmd_packet/rte_eth_packet.c | 706 +++++++++++++++++++++++++++++++++
 lib/librte_pmd_packet/rte_eth_packet.h |  53 +++
 mk/rte.app.mk                          |   4 +
 8 files changed, 835 insertions(+)
 create mode 100644 lib/librte_pmd_packet/Makefile
 create mode 100644 lib/librte_pmd_packet/rte_eth_packet.c
 create mode 100644 lib/librte_pmd_packet/rte_eth_packet.h

diff --git a/config/common_bsdapp b/config/common_bsdapp
index 2cc7b800b37b..b28c22820719 100644
--- a/config/common_bsdapp
+++ b/config/common_bsdapp
@@ -187,6 +187,11 @@ CONFIG_RTE_PMD_RING_MAX_TX_RINGS=16
 CONFIG_RTE_LIBRTE_PMD_PCAP=y
 
 #
+# Compile software PMD backed by AF_PACKET sockets (Linux only)
+#
+CONFIG_RTE_LIBRTE_PMD_PACKET=n
+
+#
 # Do prefetch of packet data within PMD driver receive function
 #
 CONFIG_RTE_PMD_PACKET_PREFETCH=y
diff --git a/config/common_linuxapp b/config/common_linuxapp
index 62619c6c3a38..3ee29e1dd7ed 100644
--- a/config/common_linuxapp
+++ b/config/common_linuxapp
@@ -210,6 +210,11 @@ CONFIG_RTE_PMD_RING_MAX_TX_RINGS=16
 #
 CONFIG_RTE_LIBRTE_PMD_PCAP=n
 
+#
+# Compile software PMD backed by AF_PACKET sockets (Linux only)
+#
+CONFIG_RTE_LIBRTE_PMD_PACKET=y
+
 
 CONFIG_RTE_LIBRTE_PMD_XENVIRT=n
 
diff --git a/lib/Makefile b/lib/Makefile
index b92b3921e654..d530097e132b 100644
--- a/lib/Makefile
+++ b/lib/Makefile
@@ -44,6 +44,7 @@ DIRS-$(CONFIG_RTE_LIBRTE_E1000_PMD) += librte_pmd_e1000
 DIRS-$(CONFIG_RTE_LIBRTE_IXGBE_PMD) += librte_pmd_ixgbe
 DIRS-$(CONFIG_RTE_LIBRTE_PMD_RING) += librte_pmd_ring
 DIRS-$(CONFIG_RTE_LIBRTE_PMD_PCAP) += librte_pmd_pcap
+DIRS-$(CONFIG_RTE_LIBRTE_PMD_PACKET) += librte_pmd_packet
 DIRS-$(CONFIG_RTE_LIBRTE_VIRTIO_PMD) += librte_pmd_virtio
 DIRS-$(CONFIG_RTE_LIBRTE_VMXNET3_PMD) += librte_pmd_vmxnet3
 DIRS-$(CONFIG_RTE_LIBRTE_PMD_XENVIRT) += librte_pmd_xenvirt
diff --git a/lib/librte_eal/linuxapp/eal/Makefile b/lib/librte_eal/linuxapp/eal/Makefile
index b05282047709..95ab389d8d74 100644
--- a/lib/librte_eal/linuxapp/eal/Makefile
+++ b/lib/librte_eal/linuxapp/eal/Makefile
@@ -44,6 +44,7 @@ CFLAGS += -I$(RTE_SDK)/lib/librte_ether
 CFLAGS += -I$(RTE_SDK)/lib/librte_ivshmem
 CFLAGS += -I$(RTE_SDK)/lib/librte_pmd_ring
 CFLAGS += -I$(RTE_SDK)/lib/librte_pmd_pcap
+CFLAGS += -I$(RTE_SDK)/lib/librte_pmd_packet
 CFLAGS += -I$(RTE_SDK)/lib/librte_pmd_xenvirt
 CFLAGS += $(WERROR_FLAGS) -O3
 
diff --git a/lib/librte_pmd_packet/Makefile b/lib/librte_pmd_packet/Makefile
new file mode 100644
index 000000000000..e1266fb992cd
--- /dev/null
+++ b/lib/librte_pmd_packet/Makefile
@@ -0,0 +1,60 @@
+#   BSD LICENSE
+#
+#   Copyright(c) 2014 John W. Linville <linville@redhat.com>
+#   Copyright(c) 2010-2014 Intel Corporation. All rights reserved.
+#   Copyright(c) 2014 6WIND S.A.
+#   All rights reserved.
+#
+#   Redistribution and use in source and binary forms, with or without
+#   modification, are permitted provided that the following conditions
+#   are met:
+#
+#     * Redistributions of source code must retain the above copyright
+#       notice, this list of conditions and the following disclaimer.
+#     * Redistributions in binary form must reproduce the above copyright
+#       notice, this list of conditions and the following disclaimer in
+#       the documentation and/or other materials provided with the
+#       distribution.
+#     * Neither the name of Intel Corporation nor the names of its
+#       contributors may be used to endorse or promote products derived
+#       from this software without specific prior written permission.
+#
+#   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+#   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+#   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+#   A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+#   OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+#   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+#   LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+#   DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+#   THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+#   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+#   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+include $(RTE_SDK)/mk/rte.vars.mk
+
+#
+# library name
+#
+LIB = librte_pmd_packet.a
+
+CFLAGS += -O3
+CFLAGS += $(WERROR_FLAGS)
+
+#
+# all source are stored in SRCS-y
+#
+SRCS-$(CONFIG_RTE_LIBRTE_PMD_PACKET) += rte_eth_packet.c
+
+#
+# Export include files
+#
+SYMLINK-y-include += rte_eth_packet.h
+
+# this lib depends upon:
+DEPDIRS-$(CONFIG_RTE_LIBRTE_PMD_PACKET) += lib/librte_mbuf
+DEPDIRS-$(CONFIG_RTE_LIBRTE_PMD_PACKET) += lib/librte_ether
+DEPDIRS-$(CONFIG_RTE_LIBRTE_PMD_PACKET) += lib/librte_malloc
+DEPDIRS-$(CONFIG_RTE_LIBRTE_PMD_PACKET) += lib/librte_kvargs
+
+include $(RTE_SDK)/mk/rte.lib.mk
diff --git a/lib/librte_pmd_packet/rte_eth_packet.c b/lib/librte_pmd_packet/rte_eth_packet.c
new file mode 100644
index 000000000000..5fb62df40d92
--- /dev/null
+++ b/lib/librte_pmd_packet/rte_eth_packet.c
@@ -0,0 +1,706 @@
+/*-
+ *   BSD LICENSE
+ *
+ *   Copyright(c) 2014 John W. Linville <linville@tuxdriver.com>
+ *
+ *   Originally based upon librte_pmd_pcap code:
+ *
+ *   Copyright(c) 2010-2014 Intel Corporation. All rights reserved.
+ *   Copyright(c) 2014 6WIND S.A.
+ *   All rights reserved.
+ *
+ *   Redistribution and use in source and binary forms, with or without
+ *   modification, are permitted provided that the following conditions
+ *   are met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ *       notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above copyright
+ *       notice, this list of conditions and the following disclaimer in
+ *       the documentation and/or other materials provided with the
+ *       distribution.
+ *     * Neither the name of Intel Corporation nor the names of its
+ *       contributors may be used to endorse or promote products derived
+ *       from this software without specific prior written permission.
+ *
+ *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ *   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ *   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ *   A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ *   OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ *   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ *   LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ *   DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ *   THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ *   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <rte_mbuf.h>
+#include <rte_ethdev.h>
+#include <rte_malloc.h>
+#include <rte_kvargs.h>
+#include <rte_dev.h>
+
+#include <linux/if_ether.h>
+#include <linux/if_packet.h>
+#include <arpa/inet.h>
+#include <net/if.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <sys/ioctl.h>
+#include <sys/mman.h>
+#include <unistd.h>
+#include <poll.h>
+
+#include "rte_eth_packet.h"
+
+#define ETH_PACKET_IFACE_ARG		"iface"
+
+/* These should be parameterized... */
+#define BLOCKSIZ	(1 << 16)
+#define BLOCKCNT	(1 << 2)
+#define FRAMESIZ	(1 << 11)
+#define FRAMECNT	((BLOCKSIZ * BLOCKCNT) / FRAMESIZ)
+#define FRMCNTMSK	(FRAMECNT - 1)
+
+struct pkt_rx_queue {
+	int sockfd;
+
+	struct iovec *rd;
+	uint8_t *map;
+	unsigned int framenum;
+
+	struct rte_mempool *mb_pool;
+
+	volatile unsigned long rx_pkts;
+	volatile unsigned long err_pkts;
+};
+
+struct pkt_tx_queue {
+	int sockfd;
+
+	struct iovec *rd;
+	uint8_t *map;
+	unsigned int framenum;
+
+	volatile unsigned long tx_pkts;
+	volatile unsigned long err_pkts;
+};
+
+struct pmd_internals {
+	unsigned nb_rx_queues;
+	unsigned nb_tx_queues;
+
+	int if_index;
+	struct ether_addr eth_addr;
+
+	struct tpacket_req req;
+
+	struct pkt_rx_queue rx_queue[RTE_PMD_RING_MAX_RX_RINGS];
+	struct pkt_tx_queue tx_queue[RTE_PMD_RING_MAX_TX_RINGS];
+};
+
+static const char *valid_arguments[] = {
+	ETH_PACKET_IFACE_ARG,
+	NULL
+};
+
+static const char *drivername = "AF_PACKET PMD";
+
+static struct rte_eth_link pmd_link = {
+	.link_speed = 10000,
+	.link_duplex = ETH_LINK_FULL_DUPLEX,
+	.link_status = 0
+};
+
+static uint16_t
+eth_packet_rx(void *queue, struct rte_mbuf **bufs, uint16_t nb_pkts)
+{
+	unsigned i;
+	struct tpacket2_hdr *ppd;
+	struct rte_mbuf *mbuf;
+	uint8_t *pbuf;
+	struct pkt_rx_queue *pkt_q = queue;
+	uint16_t num_rx = 0;
+	unsigned int framenum;
+
+	if (unlikely(nb_pkts == 0))
+		return 0;
+
+	/*
+	 * Reads the given number of packets from the AF_PACKET socket one by
+	 * one and copies the packet data into a newly allocated mbuf.
+	 */
+	framenum = pkt_q->framenum;
+	for (i = 0; i < nb_pkts; i++) {
+		/* point at the next incoming frame */
+		ppd = (struct tpacket2_hdr *) pkt_q->rd[framenum].iov_base;
+		if ((ppd->tp_status & TP_STATUS_USER) == 0)
+			break;
+
+		/* allocate the next mbuf */
+		mbuf = rte_pktmbuf_alloc(pkt_q->mb_pool);
+		if (unlikely(mbuf == NULL))
+			break;
+
+		/* packet will fit in the mbuf, go ahead and receive it */
+		mbuf->pkt.pkt_len = mbuf->pkt.data_len = ppd->tp_snaplen;
+		pbuf = (uint8_t *) ppd + ppd->tp_mac;
+		memcpy(mbuf->pkt.data, pbuf, mbuf->pkt.data_len);
+
+		/* release incoming frame and advance ring buffer */
+		ppd->tp_status = TP_STATUS_KERNEL;
+		framenum = (framenum + 1) & FRMCNTMSK;
+
+		/* account for the receive frame */
+		bufs[i] = mbuf;
+		num_rx++;
+	}
+	pkt_q->framenum = framenum;
+	pkt_q->rx_pkts += num_rx;
+	return num_rx;
+}
+
+/*
+ * Callback to handle sending packets through a real NIC.
+ */
+static uint16_t
+eth_packet_tx(void *queue, struct rte_mbuf **bufs, uint16_t nb_pkts)
+{
+	struct tpacket2_hdr *ppd;
+	struct rte_mbuf *mbuf;
+	uint8_t *pbuf;
+	unsigned int framenum;
+	struct pollfd pfd;
+	struct pkt_tx_queue *pkt_q = queue;
+	uint16_t num_tx = 0;
+	int i;
+
+	if (unlikely(nb_pkts == 0))
+		return 0;
+
+	memset(&pfd, 0, sizeof(pfd));
+	pfd.fd = pkt_q->sockfd;
+	pfd.events = POLLOUT;
+	pfd.revents = 0;
+
+	framenum = pkt_q->framenum;
+	ppd = (struct tpacket2_hdr *) pkt_q->rd[framenum].iov_base;
+	for (i = 0; i < nb_pkts; i++) {
+		/* point at the next incoming frame */
+		if ((ppd->tp_status != TP_STATUS_AVAILABLE) &&
+		    (poll(&pfd, 1, -1) < 0))
+				continue;
+
+		/* copy the tx frame data */
+		mbuf = bufs[num_tx];
+		pbuf = (uint8_t *) ppd + TPACKET2_HDRLEN -
+			sizeof(struct sockaddr_ll);
+		memcpy(pbuf, mbuf->pkt.data, mbuf->pkt.data_len);
+		ppd->tp_len = ppd->tp_snaplen = mbuf->pkt.data_len;
+
+		/* release incoming frame and advance ring buffer */
+		ppd->tp_status = TP_STATUS_SEND_REQUEST;
+		framenum = (framenum + 1) & FRMCNTMSK;
+		ppd = (struct tpacket2_hdr *) pkt_q->rd[framenum].iov_base;
+
+		num_tx++;
+		rte_pktmbuf_free(mbuf);
+	}
+
+	/* kick-off transmits */
+	send(pkt_q->sockfd, NULL, 0, 0);
+
+	pkt_q->framenum = framenum;
+	pkt_q->tx_pkts += num_tx;
+	pkt_q->err_pkts += nb_pkts - num_tx;
+	return num_tx;
+}
+
+static int
+eth_dev_start(struct rte_eth_dev *dev)
+{
+	dev->data->dev_link.link_status = 1;
+	return 0;
+}
+
+/*
+ * This function gets called when the current port gets stopped.
+ */
+static void
+eth_dev_stop(struct rte_eth_dev *dev)
+{
+	unsigned i;
+	int sockfd;
+	struct pmd_internals *internals = dev->data->dev_private;
+
+	for (i = 0; i < internals->nb_tx_queues; i++) {
+		sockfd = internals->tx_queue[i].sockfd;
+		if(sockfd != -1)
+			close(sockfd);
+	}
+
+	dev->data->dev_link.link_status = 0;
+}
+
+static int
+eth_dev_configure(struct rte_eth_dev *dev __rte_unused)
+{
+	return 0;
+}
+
+static void
+eth_dev_info(struct rte_eth_dev *dev, struct rte_eth_dev_info *dev_info)
+{
+	struct pmd_internals *internals = dev->data->dev_private;
+
+	dev_info->driver_name = drivername;
+	dev_info->if_index = internals->if_index;
+	dev_info->max_mac_addrs = 1;
+	dev_info->max_rx_pktlen = (uint32_t)ETH_FRAME_LEN;
+	dev_info->max_rx_queues = (uint16_t)internals->nb_rx_queues;
+	dev_info->max_tx_queues = (uint16_t)internals->nb_tx_queues;
+	dev_info->min_rx_bufsize = 0;
+	dev_info->pci_dev = NULL;
+}
+
+static void
+eth_stats_get(struct rte_eth_dev *dev, struct rte_eth_stats *igb_stats)
+{
+	unsigned i, imax;
+	unsigned long rx_total = 0, tx_total = 0, tx_err_total = 0;
+	const struct pmd_internals *internal = dev->data->dev_private;
+
+	memset(igb_stats, 0, sizeof(*igb_stats));
+
+	imax = (internal->nb_rx_queues < RTE_ETHDEV_QUEUE_STAT_CNTRS ?
+	        internal->nb_rx_queues : RTE_ETHDEV_QUEUE_STAT_CNTRS);
+	for (i = 0; i < imax; i++) {
+		igb_stats->q_ipackets[i] = internal->rx_queue[i].rx_pkts;
+		rx_total += igb_stats->q_ipackets[i];
+	}
+
+	imax = (internal->nb_tx_queues < RTE_ETHDEV_QUEUE_STAT_CNTRS ?
+	        internal->nb_tx_queues : RTE_ETHDEV_QUEUE_STAT_CNTRS);
+	for (i = 0; i < imax; i++) {
+		igb_stats->q_opackets[i] = internal->tx_queue[i].tx_pkts;
+		igb_stats->q_errors[i] = internal->tx_queue[i].err_pkts;
+		tx_total += igb_stats->q_opackets[i];
+		tx_err_total += igb_stats->q_errors[i];
+	}
+
+	igb_stats->ipackets = rx_total;
+	igb_stats->opackets = tx_total;
+	igb_stats->oerrors = tx_err_total;
+}
+
+static void
+eth_stats_reset(struct rte_eth_dev *dev)
+{
+	unsigned i;
+	struct pmd_internals *internal = dev->data->dev_private;
+
+	for (i = 0; i < internal->nb_rx_queues; i++)
+		internal->rx_queue[i].rx_pkts = 0;
+
+	for (i = 0; i < internal->nb_tx_queues; i++) {
+		internal->tx_queue[i].tx_pkts = 0;
+		internal->tx_queue[i].err_pkts = 0;
+	}
+}
+
+static void
+eth_dev_close(struct rte_eth_dev *dev __rte_unused)
+{
+}
+
+static void
+eth_queue_release(void *q __rte_unused)
+{
+}
+
+static int
+eth_link_update(struct rte_eth_dev *dev __rte_unused,
+                int wait_to_complete __rte_unused)
+{
+	return 0;
+}
+
+static int
+eth_rx_queue_setup(struct rte_eth_dev *dev,
+                   uint16_t rx_queue_id,
+                   uint16_t nb_rx_desc __rte_unused,
+                   unsigned int socket_id __rte_unused,
+                   const struct rte_eth_rxconf *rx_conf __rte_unused,
+                   struct rte_mempool *mb_pool)
+{
+	struct pmd_internals *internals = dev->data->dev_private;
+	struct pkt_rx_queue *pkt_q = &internals->rx_queue[rx_queue_id];
+	struct rte_pktmbuf_pool_private *mbp_priv;
+	uint16_t buf_size;
+
+	pkt_q->mb_pool = mb_pool;
+
+	/* Now get the space available for data in the mbuf */
+	mbp_priv = rte_mempool_get_priv(pkt_q->mb_pool);
+	buf_size = (uint16_t) (mbp_priv->mbuf_data_room_size -
+	                       RTE_PKTMBUF_HEADROOM);
+
+	if (ETH_FRAME_LEN > buf_size) {
+		RTE_LOG(ERR, PMD,
+			"AF_PACKET %d bytes will not fit in mbuf (%d bytes)\n",
+			ETH_FRAME_LEN, buf_size);
+		return -ENOMEM;
+	}
+
+	dev->data->rx_queues[rx_queue_id] = pkt_q;
+
+	return 0;
+}
+
+static int
+eth_tx_queue_setup(struct rte_eth_dev *dev,
+                   uint16_t tx_queue_id,
+                   uint16_t nb_tx_desc __rte_unused,
+                   unsigned int socket_id __rte_unused,
+                   const struct rte_eth_txconf *tx_conf __rte_unused)
+{
+
+	struct pmd_internals *internals = dev->data->dev_private;
+
+	dev->data->tx_queues[tx_queue_id] = &internals->tx_queue[tx_queue_id];
+	return 0;
+}
+
+static struct eth_dev_ops ops = {
+	.dev_start = eth_dev_start,
+	.dev_stop = eth_dev_stop,
+	.dev_close = eth_dev_close,
+	.dev_configure = eth_dev_configure,
+	.dev_infos_get = eth_dev_info,
+	.rx_queue_setup = eth_rx_queue_setup,
+	.tx_queue_setup = eth_tx_queue_setup,
+	.rx_queue_release = eth_queue_release,
+	.tx_queue_release = eth_queue_release,
+	.link_update = eth_link_update,
+	.stats_get = eth_stats_get,
+	.stats_reset = eth_stats_reset,
+};
+
+/*
+ * Opens an AF_PACKET socket
+ */
+static int
+open_packet_iface(const char *key __rte_unused,
+                  const char *value __rte_unused,
+                  void *extra_args)
+{
+	int *sockfd = extra_args;
+
+	/* Open an AF_PACKET socket... */
+	*sockfd = socket(AF_PACKET, SOCK_RAW, htons(ETH_P_ALL));
+	if (*sockfd == -1) {
+		RTE_LOG(ERR, PMD, "Could not open AF_PACKET socket\n");
+		return -1;
+	}
+
+	return 0;
+}
+
+static int
+rte_pmd_init_internals(const int sockfd,
+                       const unsigned nb_rx_queues,
+                       const unsigned nb_tx_queues,
+                       const unsigned numa_node,
+                       struct pmd_internals **internals,
+                       struct rte_eth_dev **eth_dev,
+                       struct rte_kvargs *kvlist)
+{
+	struct rte_eth_dev_data *data = NULL;
+	struct rte_pci_device *pci_dev = NULL;
+	struct rte_kvargs_pair *pair = NULL;
+	struct ifreq ifr;
+	size_t ifnamelen;
+	unsigned k_idx;
+	struct sockaddr_ll sockaddr;
+	struct tpacket_req *req;
+	struct pkt_rx_queue *rx_queue;
+	struct pkt_tx_queue *tx_queue;
+	int rc, tpver, discard, bypass;
+	unsigned int i, rdsize;
+
+
+	for (k_idx = 0; k_idx < kvlist->count; k_idx++) {
+		pair = &kvlist->pairs[k_idx];
+		if (strstr(pair->key, ETH_PACKET_IFACE_ARG) != NULL)
+			break;
+	}
+	if (pair == NULL) {
+		RTE_LOG(ERR, PMD,
+			"No interface specified for AF_PACKET ethdev\n");
+		goto error;
+	}
+
+	RTE_LOG(INFO, PMD,
+		"Creating AF_PACKET-backed ethdev on numa socket %u\n",
+		numa_node);
+
+	/*
+	 * now do all data allocation - for eth_dev structure, dummy pci driver
+	 * and internal (private) data
+	 */
+	data = rte_zmalloc_socket(NULL, sizeof(*data), 0, numa_node);
+	if (data == NULL)
+		goto error;
+
+	pci_dev = rte_zmalloc_socket(NULL, sizeof(*pci_dev), 0, numa_node);
+	if (pci_dev == NULL)
+		goto error;
+
+	*internals = rte_zmalloc_socket(NULL, sizeof(**internals),
+	                                0, numa_node);
+	if (*internals == NULL)
+		goto error;
+
+	tpver = TPACKET_V2;
+	rc = setsockopt(sockfd, SOL_PACKET, PACKET_VERSION,
+			&tpver, sizeof(tpver));
+	if (rc == -1) {
+		RTE_LOG(ERR, PMD,
+			"Could not set PACKET_VERSION on AF_PACKET "
+			"socket for %s\n", pair->value);
+		goto error;
+	}
+
+	discard = 1;
+	rc = setsockopt(sockfd, SOL_PACKET, PACKET_LOSS,
+			&discard, sizeof(discard));
+	if (rc == -1) {
+		RTE_LOG(ERR, PMD,
+			"Could not set PACKET_LOSS on AF_PACKET socket "
+			"for %s\n", pair->value);
+		goto error;
+	}
+
+	bypass = 1;
+	rc = setsockopt(sockfd, SOL_PACKET, PACKET_QDISC_BYPASS,
+			&bypass, sizeof(bypass));
+	if (rc == -1) {
+		RTE_LOG(ERR, PMD,
+			"Could not set PACKET_QDISC_BYPASS on AF_PACKET socket "
+			"for %s\n", pair->value);
+		goto error;
+	}
+
+	req = &((*internals)->req);
+
+	req->tp_block_size = BLOCKSIZ;
+	req->tp_block_nr = BLOCKCNT;
+	req->tp_frame_size = FRAMESIZ;
+	req->tp_frame_nr = FRAMECNT;
+
+	rc = setsockopt(sockfd, SOL_PACKET, PACKET_RX_RING, req, sizeof(*req));
+	if (rc == -1) {
+		RTE_LOG(ERR, PMD,
+			"Could not set PACKET_RX_RING on AF_PACKET "
+			"socket for %s\n", pair->value);
+		goto error;
+	}
+
+	rc = setsockopt(sockfd, SOL_PACKET, PACKET_TX_RING, req, sizeof(*req));
+	if (rc == -1) {
+		RTE_LOG(ERR, PMD,
+			"Could not set PACKET_TX_RING on AF_PACKET "
+			"socket for %s\n", pair->value);
+		goto error;
+	}
+
+	rx_queue = &((*internals)->rx_queue[0]);
+
+	rx_queue->map = mmap(NULL, 2 * req->tp_block_size * req->tp_block_nr,
+			    PROT_READ | PROT_WRITE, MAP_SHARED | MAP_LOCKED,
+			    sockfd, 0);
+	if (rx_queue->map == MAP_FAILED) {
+		RTE_LOG(ERR, PMD,
+			"Call to mmap failed on AF_PACKET socket for %s\n",
+			pair->value);
+		goto error;
+	}
+
+	/* rdsize is same for both Tx and Rx */
+	rdsize = req->tp_frame_nr * sizeof(*(rx_queue->rd));
+
+	rx_queue->rd = rte_zmalloc_socket(NULL, rdsize, 0, numa_node);
+	for (i = 0; i < req->tp_frame_nr; ++i) {
+		rx_queue->rd[i].iov_base = rx_queue->map + (i * FRAMESIZ);
+		rx_queue->rd[i].iov_len = req->tp_frame_size;
+	}
+
+	tx_queue = &((*internals)->tx_queue[0]);
+
+	tx_queue->map = rx_queue->map + req->tp_block_size * req->tp_block_nr;
+
+	tx_queue->rd = rte_zmalloc_socket(NULL, rdsize, 0, numa_node);
+	for (i = 0; i < req->tp_frame_nr; ++i) {
+		tx_queue->rd[i].iov_base = tx_queue->map + (i * FRAMESIZ);
+		tx_queue->rd[i].iov_len = req->tp_frame_size;
+	}
+
+	ifnamelen = strlen(pair->value);
+	if (ifnamelen < sizeof(ifr.ifr_name)) {
+		memcpy(ifr.ifr_name, pair->value, ifnamelen);
+		ifr.ifr_name[ifnamelen]='\0';
+	} else {
+		RTE_LOG(ERR, PMD,
+			"AF_PACKET I/F name too long (%s)\n",
+			pair->value);
+		goto error;
+	}
+	if (ioctl(sockfd, SIOCGIFINDEX, &ifr) == -1) {
+		RTE_LOG(ERR, PMD,
+			"AF_PACKET ioctl failed (SIOCGIFINDEX)\n");
+		goto error;
+	}
+	(*internals)->if_index = ifr.ifr_ifindex;
+
+	if (ioctl(sockfd, SIOCGIFHWADDR, &ifr) == -1) {
+		RTE_LOG(ERR, PMD,
+			"AF_PACKET ioctl failed (SIOCGIFHWADDR)\n");
+		goto error;
+	}
+	memcpy(&(*internals)->eth_addr, ifr.ifr_hwaddr.sa_data, ETH_ALEN);
+
+	memset(&sockaddr, 0, sizeof(sockaddr));
+	sockaddr.sll_family = AF_PACKET;
+	sockaddr.sll_protocol = htons(ETH_P_ALL);
+	sockaddr.sll_ifindex = (*internals)->if_index;
+
+	rc = bind(sockfd, (const struct sockaddr*)&sockaddr, sizeof(sockaddr));
+	if (rc == -1) {
+		RTE_LOG(ERR, PMD,
+			"Could not bind AF_PACKET socket to %s\n", pair->value);
+		goto error;
+	}
+
+	/* reserve an ethdev entry */
+	*eth_dev = rte_eth_dev_allocate();
+	if (*eth_dev == NULL)
+		goto error;
+
+	/*
+	 * now put it all together
+	 * - store queue data in internals,
+	 * - store numa_node info in pci_driver
+	 * - point eth_dev_data to internals and pci_driver
+	 * - and point eth_dev structure to new eth_dev_data structure
+	 */
+
+	(*internals)->nb_rx_queues = nb_rx_queues;
+	(*internals)->nb_tx_queues = nb_tx_queues;
+
+	data->dev_private = *internals;
+	data->port_id = (*eth_dev)->data->port_id;
+	data->nb_rx_queues = (uint16_t)nb_rx_queues;
+	data->nb_tx_queues = (uint16_t)nb_tx_queues;
+	data->dev_link = pmd_link;
+	data->mac_addrs = &(*internals)->eth_addr;
+
+	pci_dev->numa_node = numa_node;
+
+	(*eth_dev)->data = data;
+	(*eth_dev)->dev_ops = &ops;
+	(*eth_dev)->pci_dev = pci_dev;
+
+	return 0;
+
+error:
+	if (data)
+		rte_free(data);
+	if (pci_dev)
+		rte_free(pci_dev);
+	if ((*internals)->rx_queue[0].rd)
+		rte_free((*internals)->rx_queue[0].rd);
+	if ((*internals)->tx_queue[0].rd)
+		rte_free((*internals)->tx_queue[0].rd);
+	if (*internals)
+		rte_free(*internals);
+	return -1;
+}
+
+static int
+rte_eth_from_packet(int const *sockfd,
+                    const unsigned nb_rx_queues,
+                    const unsigned nb_tx_queues,
+                    const unsigned numa_node,
+                    struct rte_kvargs *kvlist)
+{
+	struct pmd_internals *internals = NULL;
+	struct rte_eth_dev *eth_dev = NULL;
+
+	/* do some parameter checking */
+	if (*sockfd < 0)
+		return -1;
+	if (nb_rx_queues < 1 || nb_tx_queues < 1)
+		return -1;
+
+	if (rte_pmd_init_internals(*sockfd,
+	                           nb_rx_queues, nb_tx_queues,
+	                           numa_node, &internals,
+	                           &eth_dev, kvlist) < 0)
+		return -1;
+
+	internals->rx_queue->sockfd = *sockfd;
+	internals->tx_queue->sockfd = *sockfd;
+
+	eth_dev->rx_pkt_burst = eth_packet_rx;
+	eth_dev->tx_pkt_burst = eth_packet_tx;
+
+	return 0;
+}
+
+int
+rte_pmd_packet_devinit(const char *name, const char *params)
+{
+	unsigned numa_node;
+	int ret;
+	struct rte_kvargs *kvlist;
+	int sockfd = -1;
+
+	RTE_LOG(INFO, PMD, "Initializing pmd_packet for %s\n", name);
+
+	numa_node = rte_socket_id();
+
+	kvlist = rte_kvargs_parse(params, valid_arguments);
+	if (kvlist == NULL)
+		return -1;
+
+	/*
+	 * If iface argument is passed we open the NICs and use them for
+	 * reading / writing
+	 */
+	if (rte_kvargs_count(kvlist, ETH_PACKET_IFACE_ARG) == 1) {
+
+		ret = rte_kvargs_process(kvlist, ETH_PACKET_IFACE_ARG,
+		                         &open_packet_iface, &sockfd);
+		if (ret < 0)
+			return -1;
+	}
+
+	ret = rte_eth_from_packet(&sockfd, 1, 1, numa_node, kvlist);
+
+	if (ret < 0) {
+		close(sockfd);
+		return -1;
+	}
+
+	return 0;
+}
+
+static struct rte_driver pmd_packet_drv = {
+	.name = "eth_packet",
+	.type = PMD_VDEV,
+	.init = rte_pmd_packet_devinit,
+};
+
+PMD_REGISTER_DRIVER(pmd_packet_drv);
diff --git a/lib/librte_pmd_packet/rte_eth_packet.h b/lib/librte_pmd_packet/rte_eth_packet.h
new file mode 100644
index 000000000000..957e551c1d28
--- /dev/null
+++ b/lib/librte_pmd_packet/rte_eth_packet.h
@@ -0,0 +1,53 @@
+/*-
+ *   BSD LICENSE
+ *
+ *   Copyright(c) 2010-2014 Intel Corporation. All rights reserved.
+ *   All rights reserved.
+ *
+ *   Redistribution and use in source and binary forms, with or without
+ *   modification, are permitted provided that the following conditions
+ *   are met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ *       notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above copyright
+ *       notice, this list of conditions and the following disclaimer in
+ *       the documentation and/or other materials provided with the
+ *       distribution.
+ *     * Neither the name of Intel Corporation nor the names of its
+ *       contributors may be used to endorse or promote products derived
+ *       from this software without specific prior written permission.
+ *
+ *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ *   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ *   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ *   A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ *   OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ *   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ *   LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ *   DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ *   THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ *   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef _RTE_ETH_PACKET_H_
+#define _RTE_ETH_PACKET_H_
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#define RTE_ETH_PACKET_PARAM_NAME "eth_packet"
+
+/**
+ * For use by the EAL only. Called as part of EAL init to set up any dummy NICs
+ * configured on command line.
+ */
+int rte_pmd_packet_devinit(const char *name, const char *params);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif
diff --git a/mk/rte.app.mk b/mk/rte.app.mk
index a8365775f176..e1439712f1d8 100644
--- a/mk/rte.app.mk
+++ b/mk/rte.app.mk
@@ -177,6 +177,10 @@ ifeq ($(CONFIG_RTE_LIBRTE_PMD_PCAP),y)
 LDLIBS += -lrte_pmd_pcap -lpcap
 endif
 
+ifeq ($(CONFIG_RTE_LIBRTE_PMD_PACKET),y)
+LDLIBS += -lrte_pmd_packet
+endif
+
 endif
 
 LDLIBS += $(EXECENV_LDLIBS)
-- 
1.9.3

^ permalink raw reply	[flat|nested] 8+ messages in thread
end of thread, other threads:[~2014-06-06 20:51 UTC | newest]

Thread overview: 8+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2014-06-06 19:25 [dpdk-dev] [RFC] librte_pmd_packet: add PMD for AF_PACKET-based virtual devices John W. Linville
2014-06-06 19:47 ` Chris Wright
2014-06-06 19:57   ` John W. Linville
2014-06-06 20:04     ` Richardson, Bruce
2014-06-06 20:06     ` Chris Wright
2014-06-06 20:30 ` Neil Horman
2014-06-06 20:36   ` John W. Linville
2014-06-06 20:51     ` Neil Horman

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