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dpif-netdev: Add functions to modify rxq without reloading pmd threads.

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This commit introduces some functions to add/remove rxqs from pmd
threads without reloading them.  They will be used by next commits.

Signed-off-by: Daniele Di Proietto <diproiettod@vmware.com>
Tested-by: Ilya Maximets <i.maximets@samsung.com>
Acked-by: Ilya Maximets <i.maximets@samsung.com>
This commit is contained in:
Daniele Di Proietto
2016-04-05 17:01:25 -07:00
parent b8d2925224
commit b68872d8bb
1 changed files with 56 additions and 21 deletions
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77
lib/dpif-netdev.c
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@@ -495,8 +495,6 @@ static void dp_netdev_destroy_all_pmds(struct dp_netdev *dp);
static void dp_netdev_del_pmds_on_numa(struct dp_netdev *dp, int numa_id);
static void dp_netdev_set_pmds_on_numa(struct dp_netdev *dp, int numa_id);
static void dp_netdev_pmd_clear_poll_list(struct dp_netdev_pmd_thread *pmd);
static void dp_netdev_del_port_from_pmd(struct dp_netdev_port *port,
struct dp_netdev_pmd_thread *pmd);
static void dp_netdev_del_port_from_all_pmds(struct dp_netdev *dp,
struct dp_netdev_port *port);
static void
@@ -3012,11 +3010,11 @@ dp_netdev_pmd_clear_poll_list(struct dp_netdev_pmd_thread *pmd)
ovs_mutex_unlock(&pmd->poll_mutex);
}
/* Deletes all rx queues of 'port' from poll_list of pmd thread and
* reloads it if poll_list was changed. */
static void
dp_netdev_del_port_from_pmd(struct dp_netdev_port *port,
struct dp_netdev_pmd_thread *pmd)
/* Deletes all rx queues of 'port' from poll_list of pmd thread. Returns true
* if 'port' was found in 'pmd' (therefore a restart is required). */
static bool
dp_netdev_del_port_from_pmd__(struct dp_netdev_port *port,
struct dp_netdev_pmd_thread *pmd)
{
struct rxq_poll *poll, *next;
bool found = false;
@@ -3031,8 +3029,30 @@ dp_netdev_del_port_from_pmd(struct dp_netdev_port *port,
}
}
ovs_mutex_unlock(&pmd->poll_mutex);
if (found) {
dp_netdev_reload_pmd__(pmd);
return found;
}
/* Deletes all rx queues of 'port' from all pmd threads. The pmd threads that
* need to be restarted are inserted in 'to_reload'. */
static void
dp_netdev_del_port_from_all_pmds__(struct dp_netdev *dp,
struct dp_netdev_port *port,
struct hmapx *to_reload)
{
int numa_id = netdev_get_numa_id(port->netdev);
struct dp_netdev_pmd_thread *pmd;
CMAP_FOR_EACH (pmd, node, &dp->poll_threads) {
if (pmd->numa_id == numa_id) {
bool found;
found = dp_netdev_del_port_from_pmd__(port, pmd);
if (found) {
hmapx_add(to_reload, pmd);
}
}
}
}
@@ -3042,16 +3062,21 @@ static void
dp_netdev_del_port_from_all_pmds(struct dp_netdev *dp,
struct dp_netdev_port *port)
{
int numa_id = netdev_get_numa_id(port->netdev);
struct dp_netdev_pmd_thread *pmd;
struct hmapx to_reload = HMAPX_INITIALIZER(&to_reload);
struct hmapx_node *node;
CMAP_FOR_EACH (pmd, node, &dp->poll_threads) {
if (pmd->numa_id == numa_id) {
dp_netdev_del_port_from_pmd(port, pmd);
}
dp_netdev_del_port_from_all_pmds__(dp, port, &to_reload);
HMAPX_FOR_EACH (node, &to_reload) {
pmd = (struct dp_netdev_pmd_thread *) node->data;
dp_netdev_reload_pmd__(pmd);
}
hmapx_destroy(&to_reload);
}
/* Returns PMD thread from this numa node with fewer rx queues to poll.
* Returns NULL if there is no PMD threads on this numa node.
* Can be called safely only by main thread. */
@@ -3087,18 +3112,16 @@ dp_netdev_add_rxq_to_pmd(struct dp_netdev_pmd_thread *pmd,
pmd->poll_cnt++;
}
/* Distributes all rx queues of 'port' between all PMD threads and reloads
* them if needed. */
/* Distributes all rx queues of 'port' between all PMD threads in 'dp'. The
* pmd threads that need to be restarted are inserted in 'to_reload'. */
static void
dp_netdev_add_port_to_pmds(struct dp_netdev *dp, struct dp_netdev_port *port)
dp_netdev_add_port_to_pmds__(struct dp_netdev *dp, struct dp_netdev_port *port,
struct hmapx *to_reload)
{
int numa_id = netdev_get_numa_id(port->netdev);
struct dp_netdev_pmd_thread *pmd;
struct hmapx to_reload;
struct hmapx_node *node;
int i;
hmapx_init(&to_reload);
/* Cannot create pmd threads for invalid numa node. */
ovs_assert(ovs_numa_numa_id_is_valid(numa_id));
@@ -3115,8 +3138,20 @@ dp_netdev_add_port_to_pmds(struct dp_netdev *dp, struct dp_netdev_port *port)
dp_netdev_add_rxq_to_pmd(pmd, port, port->rxq[i]);
ovs_mutex_unlock(&pmd->poll_mutex);
hmapx_add(&to_reload, pmd);
hmapx_add(to_reload, pmd);
}
}
/* Distributes all rx queues of 'port' between all PMD threads in 'dp' and
* reloads them, if needed. */
static void
dp_netdev_add_port_to_pmds(struct dp_netdev *dp, struct dp_netdev_port *port)
{
struct dp_netdev_pmd_thread *pmd;
struct hmapx to_reload = HMAPX_INITIALIZER(&to_reload);
struct hmapx_node *node;
dp_netdev_add_port_to_pmds__(dp, port, &to_reload);
HMAPX_FOR_EACH (node, &to_reload) {
pmd = (struct dp_netdev_pmd_thread *) node->data;