rtw88: add napi support
Use napi to reduce overhead on rx interrupts. Driver used to interrupt kernel for every Rx packet, this could affect both system and network performance. NAPI is a mechanism that uses polling when processing huge amount of traffic, by doing this the number of interrupts can be decreased. Network performance can also benefit from this patch. Since TCP connection is bidirectional and acks are required for every several packets. These ack packets occupie the PCI bus bandwidth and could lead to performance degradation. When napi is used, GRO receive is enabled by default in the mac80211 stack. So mac80211 won't pass every RX TCP packets to the kernel TCP network stack immediately. Instead an aggregated large length TCP packet will be delivered. This reduces the tx acks sent and gains rx performance. After the patch, the Rx throughput increases about 25Mbps in 11ac. Signed-off-by:Po-Hao Huang <phhuang@realtek.com> Signed-off-by:
Ping-Ke Shih <pkshih@realtek.com> Reviewed-by:
Brian Norris <briannorris@chromium.org> Tested-by:
Brian Norris <briannorris@chromium.org> Signed-off-by:
Kalle Valo <kvalo@codeaurora.org> Link: https://lore.kernel.org/r/20210209070755.23019-4-pkshih@realtek.com
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