[ovs-dev] [PATCH v3] netdev-dpdk: support port representors
Ophir Munk
ophirmu at mellanox.com
Thu Dec 20 11:29:06 UTC 2018
Dpdk port representors were introduced in dpdk versions 18.xx.
Prior to port representors there was a one-to-one relationship
between an rte device (e.g. PCI bus) and an eth device (referenced as
dpdk port id in OVS). With port representors the relationship becomes
one-to-many rte device to eth devices.
For example in [3] there are two devices (representors) using the same
PCI physical address 0000:08:00.0: "0000:08:00.0,representor=[3]" and
"0000:08:00.0,representor=[5]".
This commit handles the new one-to-many relationship. For example,
when one of the device port representors in [3] is closed - the PCI bus
cannot be detached until the other device port representor is closed as
well. OVS remains backward compatible by supporting dpdk legacy PCI
ports which do not include port representors.
Dpdk port representors related commits are listed in [1]. Dpdk port
representors documentation appears in [2]. A sample configuration
which uses two representors ports (the output of "ovs-vsctl show"
command) is shown in [3].
[1]
e0cb96204b71 ("net/i40e: add support for representor ports")
cf80ba6e2038 ("net/ixgbe: add support for representor ports")
26c08b979d26 ("net/mlx5: add port representor awareness")
[2]
doc/guides/prog_guide/switch_representation.rst
[3]
Bridge "ovs_br0"
Port "ovs_br0"
Interface "ovs_br0"
type: internal
Port "port-rep3"
Interface "port-rep3"
type: dpdk
options: {dpdk-devargs="0000:08:00.0,representor=[3]"}
Port "port-rep5"
Interface "port-rep5"
type: dpdk
options: {dpdk-devargs="0000:08:00.0,representor=[5]"}
ovs_version: "2.10.90"
Signed-off-by: Ophir Munk <ophirmu at mellanox.com>
---
v1 (hwol branch):
1. rebase on top of Kevin's patch
dpdk: Update to use DPDK 18.11.[ovs-dev,v7,dpdk-latest,1/1] dpdk: Update to use DPDK 18.11.
https://patchwork.ozlabs.org/patch/1005535/
2. skipping count of sibling ports in case the sibling port state is RTE_ETH_DEV_UNUSED
v2 (switching to master branch):
1. Update based on review comments: https://patchwork.ozlabs.org/patch/1011457/#2051417
2. Send patch on master branch
v3:
Add a FIXME comment regarding the direct access to DPDK rte_eth_devices array
lib/netdev-dpdk.c | 125 +++++++++++++++++++++++++++++++++++++++++-------------
1 file changed, 95 insertions(+), 30 deletions(-)
diff --git a/lib/netdev-dpdk.c b/lib/netdev-dpdk.c
index 320422b..18c6e25 100644
--- a/lib/netdev-dpdk.c
+++ b/lib/netdev-dpdk.c
@@ -1218,6 +1218,27 @@ dpdk_dev_parse_name(const char dev_name[], const char prefix[],
}
}
+/* Get the number of OVS interfaces which have the same DPDK
+ * rte device (e.g. same pci bus address).
+ * FIXME: avoid direct access to DPDK internal array rte_eth_devices
+ * and replace it with a proper API expected in upcoming DPDK
+ * releases. */
+static int
+netdev_dpdk_get_num_ports(struct rte_device *device)
+ OVS_REQUIRES(dpdk_mutex)
+{
+ struct netdev_dpdk *dev;
+ int count = 0;
+
+ LIST_FOR_EACH (dev, list_node, &dpdk_list) {
+ if (rte_eth_devices[dev->port_id].device == device
+ && rte_eth_devices[dev->port_id].state != RTE_ETH_DEV_UNUSED) {
+ count++;
+ }
+ }
+ return count;
+}
+
static int
vhost_common_construct(struct netdev *netdev)
OVS_REQUIRES(dpdk_mutex)
@@ -1353,20 +1374,23 @@ static void
netdev_dpdk_destruct(struct netdev *netdev)
{
struct netdev_dpdk *dev = netdev_dpdk_cast(netdev);
- struct rte_eth_dev_info dev_info;
+ struct rte_device *rte_dev;
ovs_mutex_lock(&dpdk_mutex);
rte_eth_dev_stop(dev->port_id);
dev->started = false;
-
if (dev->attached) {
+ /* Remove the port eth device. */
rte_eth_dev_close(dev->port_id);
- rte_eth_dev_info_get(dev->port_id, &dev_info);
- if (dev_info.device && !rte_dev_remove(dev_info.device)) {
- VLOG_INFO("Device '%s' has been detached", dev->devargs);
- } else {
- VLOG_ERR("Device '%s' can not be detached", dev->devargs);
+ VLOG_INFO("Device '%s' has been removed", dev->devargs);
+ /* If this is the last port_id using this rte device
+ * remove this rte device and all its eth devices. */
+ rte_dev = rte_eth_devices[dev->port_id].device;
+ if (netdev_dpdk_get_num_ports(rte_dev) == 1) {
+ if (rte_dev_remove(rte_dev) < 0) {
+ VLOG_ERR("Device '%s' can not be detached", dev->devargs);
+ }
}
}
@@ -1632,8 +1656,28 @@ netdev_dpdk_get_port_by_mac(const char *mac_str)
return DPDK_ETH_PORT_ID_INVALID;
}
+/* Return the first DPDK port_id matching the devargs pattern. */
+static dpdk_port_t
+netdev_dpdk_get_port_by_devargs(const char *devargs)
+{
+ struct rte_dev_iterator iterator;
+ dpdk_port_t port_id;
+
+ if (rte_dev_probe(devargs)) {
+ port_id = DPDK_ETH_PORT_ID_INVALID;
+ } else {
+ RTE_ETH_FOREACH_MATCHING_DEV(port_id, devargs, &iterator) {
+ /* If a break is done - must call rte_eth_iterator_cleanup(). */
+ rte_eth_iterator_cleanup(&iterator);
+ break;
+ }
+ }
+ return port_id;
+}
+
/*
- * Normally, a PCI id is enough for identifying a specific DPDK port.
+ * Normally, a PCI id (optionally followed by a representor number)
+ * is enough for identifying a specific DPDK port.
* However, for some NICs having multiple ports sharing the same PCI
* id, using PCI id won't work then.
*
@@ -1641,34 +1685,42 @@ netdev_dpdk_get_port_by_mac(const char *mac_str)
*
* Note that the compatibility is fully kept: user can still use the
* PCI id for adding ports (when it's enough for them).
+ *
+ * In order to avoid clang errors add OVS_REQUIRES(dpdk_mutex) to this function
+ * since it is required by netdev_dpdk_lookup_by_port_id() while the dpdk_mutex
+ * is taken outside of this function.
*/
static dpdk_port_t
netdev_dpdk_process_devargs(struct netdev_dpdk *dev,
const char *devargs, char **errp)
+ OVS_REQUIRES(dpdk_mutex)
{
- char *name;
dpdk_port_t new_port_id = DPDK_ETH_PORT_ID_INVALID;
if (strncmp(devargs, "class=eth,mac=", 14) == 0) {
new_port_id = netdev_dpdk_get_port_by_mac(&devargs[14]);
} else {
- name = xmemdup0(devargs, strcspn(devargs, ","));
- if (rte_eth_dev_get_port_by_name(name, &new_port_id)
- || !rte_eth_dev_is_valid_port(new_port_id)) {
- /* Device not found in DPDK, attempt to attach it */
- if (!rte_dev_probe(devargs)
- && !rte_eth_dev_get_port_by_name(name, &new_port_id)) {
- /* Attach successful */
- dev->attached = true;
- VLOG_INFO("Device '%s' attached to DPDK", devargs);
- } else {
- /* Attach unsuccessful */
+ new_port_id = netdev_dpdk_get_port_by_devargs(devargs);
+ if (!rte_eth_dev_is_valid_port(new_port_id)) {
+ new_port_id = DPDK_ETH_PORT_ID_INVALID;
+ } else {
+ struct netdev_dpdk *dup_dev;
+
+ dup_dev = netdev_dpdk_lookup_by_port_id(new_port_id);
+ if (dup_dev) {
+ VLOG_WARN_BUF(errp, "'%s' is trying to use device '%s' "
+ "which is already in use by '%s'",
+ netdev_get_name(&dev->up), devargs,
+ netdev_get_name(&dup_dev->up));
new_port_id = DPDK_ETH_PORT_ID_INVALID;
+ } else {
+ /* Device successfully found. */
+ dev->attached = true;
+ VLOG_INFO("Device '%s' attached to DPDK port %d",
+ devargs, new_port_id);
}
}
- free(name);
}
-
if (new_port_id == DPDK_ETH_PORT_ID_INVALID) {
VLOG_WARN_BUF(errp, "Error attaching device '%s' to DPDK", devargs);
}
@@ -1761,7 +1813,7 @@ netdev_dpdk_set_config(struct netdev *netdev, const struct smap *args,
dup_dev = netdev_dpdk_lookup_by_port_id(new_port_id);
if (dup_dev) {
VLOG_WARN_BUF(errp, "'%s' is trying to use device '%s' "
- "which is already in use by '%s'",
+ "which is already in use by '%s'",
netdev_get_name(netdev), new_devargs,
netdev_get_name(&dup_dev->up));
err = EADDRINUSE;
@@ -3236,11 +3288,17 @@ netdev_dpdk_detach(struct unixctl_conn *conn, int argc OVS_UNUSED,
char *response;
dpdk_port_t port_id;
struct netdev_dpdk *dev;
- struct rte_eth_dev_info dev_info;
+ struct rte_device *rte_dev;
+ struct rte_dev_iterator iterator;
ovs_mutex_lock(&dpdk_mutex);
- if (rte_eth_dev_get_port_by_name(argv[1], &port_id)) {
+ RTE_ETH_FOREACH_MATCHING_DEV(port_id, argv[1], &iterator) {
+ /* If a break is done - must call rte_eth_iterator_cleanup(). */
+ rte_eth_iterator_cleanup(&iterator);
+ break;
+ }
+ if (port_id == DPDK_ETH_PORT_ID_INVALID) {
response = xasprintf("Device '%s' not found in DPDK", argv[1]);
goto error;
}
@@ -3253,15 +3311,22 @@ netdev_dpdk_detach(struct unixctl_conn *conn, int argc OVS_UNUSED,
goto error;
}
- rte_eth_dev_close(port_id);
+ rte_dev = rte_eth_devices[port_id].device;
+ if (netdev_dpdk_get_num_ports(rte_dev)) {
+ response = xasprintf("Device '%s' is being shared with other "
+ "interfaces. Remove them before detaching.",
+ argv[1]);
+ goto error;
+ }
- rte_eth_dev_info_get(port_id, &dev_info);
- if (!dev_info.device || rte_dev_remove(dev_info.device)) {
- response = xasprintf("Device '%s' can not be detached", argv[1]);
+ rte_eth_dev_close(port_id);
+ if (rte_dev_remove(rte_dev) < 0) {
+ response = xasprintf("Device '%s' can not be removed", argv[1]);
goto error;
}
- response = xasprintf("Device '%s' has been detached", argv[1]);
+ response = xasprintf("All devices shared with device '%s' "
+ "have been detached", argv[1]);
ovs_mutex_unlock(&dpdk_mutex);
unixctl_command_reply(conn, response);
--
1.8.3.1
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