netdev - [PATCH bpf-next v3 05/11] bpf: make cavium thunder compatible w/ bpf_xdp_adjust

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Message-Id: <20180418044223.17685-6-tehnerd@tehnerd.com>
Date:   Tue, 17 Apr 2018 21:42:17 -0700
From:   "Nikita V. Shirokov" <tehnerd@...nerd.com>
To:     Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Robert Richter <rric@...nel.org>,
        Sunil Goutham <sgoutham@...ium.com>
Cc:     netdev@...r.kernel.org, "Nikita V. Shirokov" <tehnerd@...nerd.com>
Subject: [PATCH bpf-next v3 05/11] bpf: make cavium thunder compatible w/ bpf_xdp_adjust_tail

w/ bpf_xdp_adjust_tail helper xdp's data_end pointer could be changed as
well (only "decrease" of pointer's location is going to be supported).
changing of this pointer will change packet's size.
for cavium's thunder driver we will just calculate packet's length
unconditionally

Acked-by: Alexei Starovoitov <ast@...nel.org>
Signed-off-by: Nikita V. Shirokov <tehnerd@...nerd.com>
---
 drivers/net/ethernet/cavium/thunder/nicvf_main.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/cavium/thunder/nicvf_main.c b/drivers/net/ethernet/cavium/thunder/nicvf_main.c
index 707db3304396..7135db45927e 100644
--- a/drivers/net/ethernet/cavium/thunder/nicvf_main.c
+++ b/drivers/net/ethernet/cavium/thunder/nicvf_main.c
@@ -538,9 +538,9 @@ static inline bool nicvf_xdp_rx(struct nicvf *nic, struct bpf_prog *prog,
 	action = bpf_prog_run_xdp(prog, &xdp);
 	rcu_read_unlock();
 
+	len = xdp.data_end - xdp.data;
 	/* Check if XDP program has changed headers */
 	if (orig_data != xdp.data) {
-		len = xdp.data_end - xdp.data;
 		offset = orig_data - xdp.data;
 		dma_addr -= offset;
 	}
-- 
2.15.1