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From: Maxime Coquelin <maxime.coquelin@redhat.com>
To: dev@dpdk.org, matan@mellanox.com, xiao.w.wang@intel.com,
	zhihong.wang@intel.com, xiaolong.ye@intel.com,
	chenbo.xia@intel.com, david.marchand@redhat.com,
	amorenoz@redhat.com, shreyansh.jain@nxp.com,
	viacheslavo@mellanox.com, hemant.agrawal@nxp.com,
	sachin.saxena@nxp.com
Cc: Maxime Coquelin <maxime.coquelin@redhat.com>
Subject: [dpdk-dev] [PATCH 03/14] vhost: introduce vDPA devices class
Date: Thu, 11 Jun 2020 23:37:37 +0200
Message-ID: <20200611213748.1967029-4-maxime.coquelin@redhat.com> (raw)
In-Reply-To: <20200611213748.1967029-1-maxime.coquelin@redhat.com>

This patch introduces vDPA device class. It will enable
application to iterate over the vDPA devices.

Signed-off-by: Maxime Coquelin <maxime.coquelin@redhat.com>
---
 lib/librte_vhost/vdpa.c | 116 +++++++++++++++++++++++++++++++++-------
 1 file changed, 98 insertions(+), 18 deletions(-)

diff --git a/lib/librte_vhost/vdpa.c b/lib/librte_vhost/vdpa.c
index b2b2a105f1..61ab9aadb4 100644
--- a/lib/librte_vhost/vdpa.c
+++ b/lib/librte_vhost/vdpa.c
@@ -10,11 +10,12 @@
 
 #include <stdbool.h>
 
+#include <rte_class.h>
 #include <rte_malloc.h>
 #include "rte_vdpa.h"
 #include "vhost.h"
 
-static struct rte_vdpa_device *vdpa_devices[MAX_VHOST_DEVICE];
+static struct rte_vdpa_device vdpa_devices[MAX_VHOST_DEVICE];
 static uint32_t vdpa_device_num;
 
 static bool
@@ -46,35 +47,28 @@ rte_vdpa_register_device(struct rte_vdpa_dev_addr *addr,
 		struct rte_vdpa_dev_ops *ops)
 {
 	struct rte_vdpa_device *dev;
-	char device_name[MAX_VDPA_NAME_LEN];
 	int i;
 
 	if (vdpa_device_num >= MAX_VHOST_DEVICE || addr == NULL || ops == NULL)
 		return -1;
 
 	for (i = 0; i < MAX_VHOST_DEVICE; i++) {
-		dev = vdpa_devices[i];
-		if (dev && is_same_vdpa_device(&dev->addr, addr))
+		dev = &vdpa_devices[i];
+		if (dev->ops && is_same_vdpa_device(&dev->addr, addr))
 			return -1;
 	}
 
 	for (i = 0; i < MAX_VHOST_DEVICE; i++) {
-		if (vdpa_devices[i] == NULL)
+		if (vdpa_devices[i].ops == NULL)
 			break;
 	}
 
 	if (i == MAX_VHOST_DEVICE)
 		return -1;
 
-	snprintf(device_name, sizeof(device_name), "vdpa-dev-%d", i);
-	dev = rte_zmalloc(device_name, sizeof(struct rte_vdpa_device),
-			RTE_CACHE_LINE_SIZE);
-	if (!dev)
-		return -1;
-
+	dev = &vdpa_devices[i];
 	memcpy(&dev->addr, addr, sizeof(struct rte_vdpa_dev_addr));
 	dev->ops = ops;
-	vdpa_devices[i] = dev;
 	vdpa_device_num++;
 
 	return i;
@@ -83,11 +77,10 @@ rte_vdpa_register_device(struct rte_vdpa_dev_addr *addr,
 int
 rte_vdpa_unregister_device(int did)
 {
-	if (did < 0 || did >= MAX_VHOST_DEVICE || vdpa_devices[did] == NULL)
+	if (did < 0 || did >= MAX_VHOST_DEVICE || vdpa_devices[did].ops == NULL)
 		return -1;
 
-	rte_free(vdpa_devices[did]);
-	vdpa_devices[did] = NULL;
+	memset(&vdpa_devices[did], 0, sizeof(struct rte_vdpa_device));
 	vdpa_device_num--;
 
 	return did;
@@ -103,8 +96,11 @@ rte_vdpa_find_device_id(struct rte_vdpa_dev_addr *addr)
 		return -1;
 
 	for (i = 0; i < MAX_VHOST_DEVICE; ++i) {
-		dev = vdpa_devices[i];
-		if (dev && is_same_vdpa_device(&dev->addr, addr))
+		dev = &vdpa_devices[i];
+		if (dev->ops == NULL)
+			continue;
+
+		if (is_same_vdpa_device(&dev->addr, addr))
 			return i;
 	}
 
@@ -117,7 +113,7 @@ rte_vdpa_get_device(int did)
 	if (did < 0 || did >= MAX_VHOST_DEVICE)
 		return NULL;
 
-	return vdpa_devices[did];
+	return &vdpa_devices[did];
 }
 
 int
@@ -227,3 +223,87 @@ rte_vdpa_relay_vring_used(int vid, uint16_t qid, void *vring_m)
 		free_ind_table(idesc);
 	return -1;
 }
+
+static uint16_t
+vdpa_dev_to_id(const struct rte_vdpa_device *dev)
+{
+	if (dev == NULL)
+		return MAX_VHOST_DEVICE;
+	return dev - vdpa_devices;
+}
+
+static int
+vdpa_dev_match(struct rte_vdpa_device *dev,
+	      const struct rte_device *rte_dev)
+{
+	struct rte_vdpa_dev_addr addr;
+
+	/*  Only PCI bus supported for now */
+	if (strcmp(rte_dev->bus->name, "pci") != 0)
+		return -1;
+
+	addr.type = VDPA_ADDR_PCI;
+
+	if (rte_pci_addr_parse(rte_dev->name, &addr.pci_addr) != 0)
+		return -1;
+
+	if (!is_same_vdpa_device(&dev->addr, &addr))
+		return -1;
+
+	return 0;
+}
+
+/* Generic rte_vdpa_dev comparison function. */
+typedef int (*rte_vdpa_cmp_t)(struct rte_vdpa_device *,
+		const struct rte_device *rte_dev);
+
+static struct rte_vdpa_device *
+vdpa_find_device(const struct rte_vdpa_device *start, rte_vdpa_cmp_t cmp,
+		struct rte_device *rte_dev)
+{
+	struct rte_vdpa_device *dev;
+	ptrdiff_t idx;
+
+	/* Avoid Undefined Behaviour */
+	if (start != NULL &&
+	    (start < &vdpa_devices[0] ||
+	     start >= &vdpa_devices[MAX_VHOST_DEVICE]))
+		return NULL;
+
+	if (start != NULL)
+		idx = vdpa_dev_to_id(start) + 1;
+	else
+		idx = 0;
+	for (; idx < MAX_VHOST_DEVICE; idx++) {
+		dev = &vdpa_devices[idx];
+		/*
+		 * ToDo: Certainly better to introduce a state field,
+		 * but rely on ops being set for now.
+		 */
+		if (dev->ops == NULL)
+			continue;
+		if (cmp(dev, rte_dev) == 0)
+			return dev;
+	}
+	return NULL;
+}
+
+static void *
+vdpa_dev_iterate(const void *start,
+		const char *str,
+		const struct rte_dev_iterator *it)
+{
+	struct rte_vdpa_device *vdpa_dev = NULL;
+
+	RTE_SET_USED(str);
+
+	vdpa_dev = vdpa_find_device(start, vdpa_dev_match, it->device);
+
+	return vdpa_dev;
+}
+
+static struct rte_class rte_class_vdpa = {
+	.dev_iterate = vdpa_dev_iterate,
+};
+
+RTE_REGISTER_CLASS(vdpa, rte_class_vdpa);
-- 
2.26.2


  parent reply	other threads:[~2020-06-11 21:38 UTC|newest]

Thread overview: 25+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-06-11 21:37 [dpdk-dev] [PATCH 00/14] vDPA API and framework rework Maxime Coquelin
2020-06-11 21:37 ` [dpdk-dev] [PATCH 01/14] bus/dpaa: fix null pointer dereference Maxime Coquelin
2020-06-12  9:48   ` Gaëtan Rivet
2020-06-11 21:37 ` [dpdk-dev] [PATCH 02/14] bus/fslmc: " Maxime Coquelin
2020-06-11 21:37 ` Maxime Coquelin [this message]
2020-06-12 12:37   ` [dpdk-dev] [PATCH 03/14] vhost: introduce vDPA devices class Gaëtan Rivet
2020-06-15  9:15     ` Maxime Coquelin
2020-06-11 21:37 ` [dpdk-dev] [PATCH 04/14] vhost: make vDPA framework bus agnostic Maxime Coquelin
2020-06-12 12:46   ` Gaëtan Rivet
2020-06-15  9:17     ` Maxime Coquelin
2020-06-19 11:14   ` Adrian Moreno
2020-06-19 15:11     ` Maxime Coquelin
2020-06-22  9:49       ` Adrian Moreno
2020-06-22 12:34         ` Maxime Coquelin
2020-06-11 21:37 ` [dpdk-dev] [PATCH 05/14] vhost: replace device ID in vDPA ops Maxime Coquelin
2020-06-11 21:37 ` [dpdk-dev] [PATCH 06/14] vhost: replace vDPA device ID in Vhost Maxime Coquelin
2020-06-11 21:37 ` [dpdk-dev] [PATCH 07/14] vhost: replace device ID in applications Maxime Coquelin
2020-06-11 21:37 ` [dpdk-dev] [PATCH 08/14] vhost: remove useless vDPA API Maxime Coquelin
2020-06-11 21:37 ` [dpdk-dev] [PATCH 09/14] vhost: use linked-list for vDPA devices Maxime Coquelin
2020-06-11 21:37 ` [dpdk-dev] [PATCH 10/14] vhost: introduce wrappers for some vDPA ops Maxime Coquelin
2020-06-11 21:37 ` [dpdk-dev] [PATCH 11/14] examples/vdpa: use new wrappers instead of ops Maxime Coquelin
2020-06-11 21:37 ` [dpdk-dev] [PATCH 12/14] examples/vdpa: remove useless device count Maxime Coquelin
2020-06-11 21:37 ` [dpdk-dev] [PATCH 13/14] vhost: remove vDPA device count API Maxime Coquelin
2020-06-11 21:37 ` [dpdk-dev] [PATCH 14/14] vhost: split vDPA header file Maxime Coquelin
2020-06-12  9:38 ` [dpdk-dev] [PATCH 00/14] vDPA API and framework rework Gaëtan Rivet

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