From aecd67b60722dd24353b0bc50e78a55b30707dcd Mon Sep 17 00:00:00 2001 From: Jesper Dangaard Brouer Date: Wed, 3 Jan 2018 11:25:13 +0100 Subject: xdp: base API for new XDP rx-queue info concept This patch only introduce the core data structures and API functions. All XDP enabled drivers must use the API before this info can used. There is a need for XDP to know more about the RX-queue a given XDP frames have arrived on. For both the XDP bpf-prog and kernel side. Instead of extending xdp_buff each time new info is needed, the patch creates a separate read-mostly struct xdp_rxq_info, that contains this info. We stress this data/cache-line is for read-only info. This is NOT for dynamic per packet info, use the data_meta for such use-cases. The performance advantage is this info can be setup at RX-ring init time, instead of updating N-members in xdp_buff. A possible (driver level) micro optimization is that xdp_buff->rxq assignment could be done once per XDP/NAPI loop. The extra pointer deref only happens for program needing access to this info (thus, no slowdown to existing use-cases). Signed-off-by: Jesper Dangaard Brouer Signed-off-by: Alexei Starovoitov --- include/linux/filter.h | 2 ++ 1 file changed, 2 insertions(+) (limited to 'include/linux') diff --git a/include/linux/filter.h b/include/linux/filter.h index 2b0df2703671..425056c7f96c 100644 --- a/include/linux/filter.h +++ b/include/linux/filter.h @@ -20,6 +20,7 @@ #include #include +#include #include #include @@ -503,6 +504,7 @@ struct xdp_buff { void *data_end; void *data_meta; void *data_hard_start; + struct xdp_rxq_info *rxq; }; /* Compute the linear packet data range [data, data_end) which -- cgit v1.2.3