[PATCH net 3/3] nfp: flower: use offsets provided by pedit instead of index for ipv6

[Jakub Kicinski]

From: Pieter Jansen van Vuuren <pieter.jansenvanvuu...@netronome.com>

Previously when populating the set ipv6 address action, we incorrectly
made use of pedit's key index to determine which 32bit word should be
set. We now calculate which word has been selected based on the offset
provided by the pedit action.

Fixes: 354b82bb320e ("nfp: add set ipv6 source and destination address")
Signed-off-by: Pieter Jansen van Vuuren <pieter.jansenvanvuu...@netronome.com>
Reviewed-by: Jakub Kicinski <jakub.kicin...@netronome.com>
---
 .../ethernet/netronome/nfp/flower/action.c    | 26 +++++++++++--------
 1 file changed, 15 insertions(+), 11 deletions(-)

diff --git a/drivers/net/ethernet/netronome/nfp/flower/action.c 
b/drivers/net/ethernet/netronome/nfp/flower/action.c
index c39d7fdf73e6..7a1e9cd9cc62 100644
--- a/drivers/net/ethernet/netronome/nfp/flower/action.c
+++ b/drivers/net/ethernet/netronome/nfp/flower/action.c
@@ -450,12 +450,12 @@ nfp_fl_set_ip4(const struct tc_action *action, int idx, 
u32 off,
 }
 
 static void
-nfp_fl_set_ip6_helper(int opcode_tag, int idx, __be32 exact, __be32 mask,
+nfp_fl_set_ip6_helper(int opcode_tag, u8 word, __be32 exact, __be32 mask,
                      struct nfp_fl_set_ipv6_addr *ip6)
 {
-       ip6->ipv6[idx % 4].mask |= mask;
-       ip6->ipv6[idx % 4].exact &= ~mask;
-       ip6->ipv6[idx % 4].exact |= exact & mask;
+       ip6->ipv6[word].mask |= mask;
+       ip6->ipv6[word].exact &= ~mask;
+       ip6->ipv6[word].exact |= exact & mask;
 
        ip6->reserved = cpu_to_be16(0);
        ip6->head.jump_id = opcode_tag;
@@ -468,6 +468,7 @@ nfp_fl_set_ip6(const struct tc_action *action, int idx, u32 
off,
               struct nfp_fl_set_ipv6_addr *ip_src)
 {
        __be32 exact, mask;
+       u8 word;
 
        /* We are expecting tcf_pedit to return a big endian value */
        mask = (__force __be32)~tcf_pedit_mask(action, idx);
@@ -476,17 +477,20 @@ nfp_fl_set_ip6(const struct tc_action *action, int idx, 
u32 off,
        if (exact & ~mask)
                return -EOPNOTSUPP;
 
-       if (off < offsetof(struct ipv6hdr, saddr))
+       if (off < offsetof(struct ipv6hdr, saddr)) {
                return -EOPNOTSUPP;
-       else if (off < offsetof(struct ipv6hdr, daddr))
-               nfp_fl_set_ip6_helper(NFP_FL_ACTION_OPCODE_SET_IPV6_SRC, idx,
+       } else if (off < offsetof(struct ipv6hdr, daddr)) {
+               word = (off - offsetof(struct ipv6hdr, saddr)) / sizeof(exact);
+               nfp_fl_set_ip6_helper(NFP_FL_ACTION_OPCODE_SET_IPV6_SRC, word,
                                      exact, mask, ip_src);
-       else if (off < offsetof(struct ipv6hdr, daddr) +
-                      sizeof(struct in6_addr))
-               nfp_fl_set_ip6_helper(NFP_FL_ACTION_OPCODE_SET_IPV6_DST, idx,
+       } else if (off < offsetof(struct ipv6hdr, daddr) +
+                      sizeof(struct in6_addr)) {
+               word = (off - offsetof(struct ipv6hdr, daddr)) / sizeof(exact);
+               nfp_fl_set_ip6_helper(NFP_FL_ACTION_OPCODE_SET_IPV6_DST, word,
                                      exact, mask, ip_dst);
-       else
+       } else {
                return -EOPNOTSUPP;
+       }
 
        return 0;
 }
-- 
2.17.1