From 01c15e93a78cfcf45cc32d07aa38bdc84250f569 Mon Sep 17 00:00:00 2001 From: Pieter Jansen van Vuuren Date: Fri, 19 Jan 2018 17:54:08 -0800 Subject: [PATCH] nfp: flower: prioritize stats updates Previously it was possible to interrupt processing stats updates because they were handled in a work queue. Interrupting the stats updates could lead to a situation where we backup the control message queue. This patch moves the stats update processing out of the work queue to be processed as soon as hardware sends a request. Reported-by: Louis Peens Signed-off-by: Pieter Jansen van Vuuren Reviewed-by: Dirk van der Merwe Reviewed-by: Jakub Kicinski Signed-off-by: David S. Miller --- drivers/net/ethernet/netronome/nfp/flower/cmsg.c | 29 +++++++++++++++--------- 1 file changed, 18 insertions(+), 11 deletions(-) diff --git a/drivers/net/ethernet/netronome/nfp/flower/cmsg.c b/drivers/net/ethernet/netronome/nfp/flower/cmsg.c index 615314d..baaea6f 100644 --- a/drivers/net/ethernet/netronome/nfp/flower/cmsg.c +++ b/drivers/net/ethernet/netronome/nfp/flower/cmsg.c @@ -211,12 +211,6 @@ nfp_flower_cmsg_process_one_rx(struct nfp_app *app, struct sk_buff *skb) cmsg_hdr = nfp_flower_cmsg_get_hdr(skb); - if (unlikely(cmsg_hdr->version != NFP_FLOWER_CMSG_VER1)) { - nfp_flower_cmsg_warn(app, "Cannot handle repr control version %u\n", - cmsg_hdr->version); - goto out; - } - type = cmsg_hdr->type; switch (type) { case NFP_FLOWER_CMSG_TYPE_PORT_REIFY: @@ -225,9 +219,6 @@ nfp_flower_cmsg_process_one_rx(struct nfp_app *app, struct sk_buff *skb) case NFP_FLOWER_CMSG_TYPE_PORT_MOD: nfp_flower_cmsg_portmod_rx(app, skb); break; - case NFP_FLOWER_CMSG_TYPE_FLOW_STATS: - nfp_flower_rx_flow_stats(app, skb); - break; case NFP_FLOWER_CMSG_TYPE_NO_NEIGH: nfp_tunnel_request_route(app, skb); break; @@ -263,7 +254,23 @@ void nfp_flower_cmsg_process_rx(struct work_struct *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); + + if (unlikely(cmsg_hdr->version != NFP_FLOWER_CMSG_VER1)) { + nfp_flower_cmsg_warn(app, "Cannot handle repr control version %u\n", + cmsg_hdr->version); + dev_kfree_skb_any(skb); + return; + } - skb_queue_tail(&priv->cmsg_skbs, skb); - schedule_work(&priv->cmsg_work); + if (cmsg_hdr->type == NFP_FLOWER_CMSG_TYPE_FLOW_STATS) { + /* We need to deal with stats updates from HW asap */ + nfp_flower_rx_flow_stats(app, skb); + dev_consume_skb_any(skb); + } else { + skb_queue_tail(&priv->cmsg_skbs, skb); + schedule_work(&priv->cmsg_work); + } } -- 2.7.4