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rps: Inspect PPTP encapsulated by GRE to get flow hash

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The PPTP is encapsulated by GRE header with that GRE_VERSION bits
must contain one. But current GRE RPS needs the GRE_VERSION must be
zero. So RPS does not work for PPTP traffic.

In my test environment, there are four MIPS cores, and all traffic
are passed through by PPTP. As a result, only one core is 100% busy
while other three cores are very idle. After this patch, the usage
of four cores are balanced well.

Signed-off-by: Gao Feng <fgao@ikuai8.com>
Reviewed-by: Philip Prindeville <philipp@redfish-solutions.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Gao Feng
2016-08-09 12:38:24 +08:00
committed by David S. Miller
parent 084c9535aa
commit ab10dccb11
5 changed files with 133 additions and 69 deletions
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10
include/net/gre.h
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@@ -7,7 +7,15 @@
struct gre_base_hdr {
__be16 flags;
__be16 protocol;
};
} __packed;
struct gre_full_hdr {
struct gre_base_hdr fixed_header;
__be16 csum;
__be16 reserved1;
__be32 key;
__be32 seq;
} __packed;
#define GRE_HEADER_SECTION 4
#define GREPROTO_CISCO 0