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qcacld-3.0: Update Wifi netdevs for IPA exception path NAPI

Bladeren bron 
Starting Kernel 4.19 IPA LAN RX supports NAPI polling
mechanism. Netdevs that hook into IPA need to call
netif_receive_skb() or similar to deliver the packet
to network stack instead of using netif_rx_ni().

IPA driver exports ipa_get_lan_rx_napi(void) API for
this purpose. If this API call returns true use
netif_receive_skb() or fallback on legacy api.

Add the changes under a feature flag IPA_LAN_RX_NAPI_SUPPORT.
The flag is enabled only for linux kernel version 4.19 and
above.

Change-Id: I3bf200c993461e45da0d07697678c634760e9a89
CRs-Fixed: 2560360
This commit is contained in:
Nisha Menon
2019-12-11 16:09:04 -08:00
gecommit door nshrivas
bovenliggende 3193c42596
commit 9db78810c9
1 gewijzigde bestanden met toevoegingen van 29 en 4 verwijderingen
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33
core/hdd/src/wlan_hdd_ipa.c
Bestand weergeven

@@ -1,5 +1,5 @@
/*
* Copyright (c) 2013-2019 The Linux Foundation. All rights reserved.
* Copyright (c) 2013-2020 The Linux Foundation. All rights reserved.
*
* Permission to use, copy, modify, and/or distribute this software for
* any purpose with or without fee is hereby granted, provided that the
@@ -355,6 +355,28 @@ static void hdd_ipa_set_wake_up_idle(bool wake_up_idle)
}
#endif
/**
* hdd_ipa_send_to_nw_stack() - Check if IPA supports NAPI
* polling during RX
* @skb : data buffer sent to network stack
*
* If IPA LAN RX supports NAPI polling mechanism use
* netif_receive_skb instead of netif_rx_ni to forward the skb
* to network stack.
*
* Return: Return value from netif_rx_ni/netif_receive_skb
*/
static int hdd_ipa_send_to_nw_stack(qdf_nbuf_t skb)
{
int result;
if (qdf_ipa_get_lan_rx_napi())
result = netif_receive_skb(skb);
else
result = netif_rx_ni(skb);
return result;
}
#ifdef QCA_CONFIG_SMP
/**
@@ -367,13 +389,16 @@ static void hdd_ipa_set_wake_up_idle(bool wake_up_idle)
* In this manner, UDP/TCP packets are sent in an aggregated way to the stack.
* For IP/ICMP packets, simply call netif_rx_ni.
*
* Check if IPA supports NAPI polling then use netif_receive_skb
* instead of netif_rx_ni.
*
* Return: return value from the netif_rx_ni/netif_rx api.
*/
static int hdd_ipa_aggregated_rx_ind(qdf_nbuf_t skb)
{
int ret;
ret = netif_rx_ni(skb);
ret = hdd_ipa_send_to_nw_stack(skb);
return ret;
}
#else
@@ -387,13 +412,13 @@ static int hdd_ipa_aggregated_rx_ind(qdf_nbuf_t skb)
ip_h = (struct iphdr *)(skb->data);
if ((skb->protocol == htons(ETH_P_IP)) &&
(ip_h->protocol == IPPROTO_ICMP)) {
result = netif_rx_ni(skb);
result = hdd_ipa_send_to_nw_stack(skb);
} else {
/* Call netif_rx_ni for every IPA_WLAN_RX_SOFTIRQ_THRESH packets
* to avoid excessive softirq's.
*/
if (atomic_dec_and_test(&softirq_mitigation_cntr)) {
result = netif_rx_ni(skb);
result = hdd_ipa_send_to_nw_stack(skb);
atomic_set(&softirq_mitigation_cntr,
IPA_WLAN_RX_SOFTIRQ_THRESH);
} else {