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nfp: flower: split and limit cmsg skb lists

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Introduce a second skb list for handling control messages and limit the
number of allowed messages. Some control messages are considered more
crucial than others, resulting in the need for a second skb list. By
splitting the list into a separate high and low priority list we can
ensure that messages on the high list get added to the head of the list
that gets processed, this however has no functional impact. Previously
there was no limit on the number of messages allowed on the queue, this
could result in the queue growing boundlessly and eventually the host
running out of memory.

Fixes: b985f870a5 ("nfp: process control messages in workqueue in flower app")
Signed-off-by: Pieter Jansen van Vuuren <pieter.jansenvanvuuren@netronome.com>
Reviewed-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Reviewed-by: Simon Horman <simon.horman@netronome.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Pieter Jansen van Vuuren 2018-04-11 16:47:38 -07:00 committed by David S. Miller
parent 0b1a989ef5
commit cf2cbadc20
4 changed files with 46 additions and 8 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

38
drivers/net/ethernet/netronome/nfp/flower/cmsg.c
View File

@ -272,18 +272,49 @@ out:
void nfp_flower_cmsg_process_rx(struct work_struct *work)
{
struct sk_buff_head cmsg_joined;
struct nfp_flower_priv *priv;
struct sk_buff *skb;
priv = container_of(work, struct nfp_flower_priv, cmsg_work);
skb_queue_head_init(&cmsg_joined);
while ((skb = skb_dequeue(&priv->cmsg_skbs)))
spin_lock_bh(&priv->cmsg_skbs_high.lock);
skb_queue_splice_tail_init(&priv->cmsg_skbs_high, &cmsg_joined);
spin_unlock_bh(&priv->cmsg_skbs_high.lock);
spin_lock_bh(&priv->cmsg_skbs_low.lock);
skb_queue_splice_tail_init(&priv->cmsg_skbs_low, &cmsg_joined);
spin_unlock_bh(&priv->cmsg_skbs_low.lock);
while ((skb = __skb_dequeue(&cmsg_joined)))
nfp_flower_cmsg_process_one_rx(priv->app, skb);
}
static void
nfp_flower_queue_ctl_msg(struct nfp_app *app, struct sk_buff *skb, int type)
{
struct nfp_flower_priv *priv = app->priv;
struct sk_buff_head *skb_head;
if (type == NFP_FLOWER_CMSG_TYPE_PORT_REIFY ||
type == NFP_FLOWER_CMSG_TYPE_PORT_MOD)
skb_head = &priv->cmsg_skbs_high;
else
skb_head = &priv->cmsg_skbs_low;
if (skb_queue_len(skb_head) >= NFP_FLOWER_WORKQ_MAX_SKBS) {
nfp_flower_cmsg_warn(app, "Dropping queued control messages\n");
dev_kfree_skb_any(skb);
return;
}
skb_queue_tail(skb_head, skb);
schedule_work(&priv->cmsg_work);
}
void nfp_flower_cmsg_rx(struct nfp_app *app, struct sk_buff *skb)
{
struct nfp_flower_priv *priv = app->priv;
struct nfp_flower_cmsg_hdr *cmsg_hdr;
cmsg_hdr = nfp_flower_cmsg_get_hdr(skb);
@ -307,7 +338,6 @@ void nfp_flower_cmsg_rx(struct nfp_app *app, struct sk_buff *skb)
/* Acks from the NFP that the route is added - ignore. */
dev_consume_skb_any(skb);
} else {
skb_queue_tail(&priv->cmsg_skbs, skb);
schedule_work(&priv->cmsg_work);
nfp_flower_queue_ctl_msg(app, skb, cmsg_hdr->type);
}
}

2
drivers/net/ethernet/netronome/nfp/flower/cmsg.h
View File

@ -108,6 +108,8 @@
#define NFP_FL_IPV4_TUNNEL_TYPE GENMASK(7, 4)
#define NFP_FL_IPV4_PRE_TUN_INDEX GENMASK(2, 0)
#define NFP_FLOWER_WORKQ_MAX_SKBS 30000
#define nfp_flower_cmsg_warn(app, fmt, args...) \
do { \
if (net_ratelimit()) \

6
drivers/net/ethernet/netronome/nfp/flower/main.c
View File

@ -519,7 +519,8 @@ static int nfp_flower_init(struct nfp_app *app)
app->priv = app_priv;
app_priv->app = app;
skb_queue_head_init(&app_priv->cmsg_skbs);
skb_queue_head_init(&app_priv->cmsg_skbs_high);
skb_queue_head_init(&app_priv->cmsg_skbs_low);
INIT_WORK(&app_priv->cmsg_work, nfp_flower_cmsg_process_rx);
init_waitqueue_head(&app_priv->reify_wait_queue);
@ -549,7 +550,8 @@ static void nfp_flower_clean(struct nfp_app *app)
{
struct nfp_flower_priv *app_priv = app->priv;
skb_queue_purge(&app_priv->cmsg_skbs);
skb_queue_purge(&app_priv->cmsg_skbs_high);
skb_queue_purge(&app_priv->cmsg_skbs_low);
flush_work(&app_priv->cmsg_work);
nfp_flower_metadata_cleanup(app);

8
drivers/net/ethernet/netronome/nfp/flower/main.h
View File

@ -107,7 +107,10 @@ struct nfp_mtu_conf {
* @mask_table: Hash table used to store masks
* @flow_table: Hash table used to store flower rules
* @cmsg_work: Workqueue for control messages processing
* @cmsg_skbs: List of skbs for control message processing
* @cmsg_skbs_high: List of higher priority skbs for control message
* processing
* @cmsg_skbs_low: List of lower priority skbs for control message
* processing
* @nfp_mac_off_list: List of MAC addresses to offload
* @nfp_mac_index_list: List of unique 8-bit indexes for non NFP netdevs
* @nfp_ipv4_off_list: List of IPv4 addresses to offload
@ -136,7 +139,8 @@ struct nfp_flower_priv {
DECLARE_HASHTABLE(mask_table, NFP_FLOWER_MASK_HASH_BITS);
DECLARE_HASHTABLE(flow_table, NFP_FLOWER_HASH_BITS);
struct work_struct cmsg_work;
struct sk_buff_head cmsg_skbs;
struct sk_buff_head cmsg_skbs_high;
struct sk_buff_head cmsg_skbs_low;
struct list_head nfp_mac_off_list;
struct list_head nfp_mac_index_list;
struct list_head nfp_ipv4_off_list;