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authorParav Pandit <parav@mellanox.com>2017-11-14 15:51:49 +0300
committerJason Gunthorpe <jgg@mellanox.com>2017-12-18 23:49:43 +0300
commit1060f86534147c2830db4bbc9dd849d1892a611b (patch)
treef4c8d11a3fa5145531a2bd294b592c614bcc7cb9 /include/rdma
parent8b0c05dc9380ea3e5d42e0df0a79aeb4971220c5 (diff)
downloadlinux-1060f86534147c2830db4bbc9dd849d1892a611b.tar.xz
IB/{core/cm}: Fix generating a return AH for RoCEE
When computing a UD reverse path (return AH) from a WC the code was not doing a route lookup anchored in a specific netdevice. This caused several bugs, including broken IPv6 link-local address support in RoCEv2. [1] This fixes the lookup by determining the GID table entry that the HW matched to the SGID for the WC and then using the netdevice from that entry to perform the route and ND lookup for the 'DGID' to build a return AH. RoCE GID table management ensures that right upper netdevices of the physical netdevices are added. Therefore init_ah_from_wc doesn't need to perform such check. Now that route lookup is done based on the netdevice of the GID entry, simplify code to not have ifindex and vlan pointers. As part of that, refactor to have netdevice as input parameter. This is already discussed at [2]. Finally ib_init_ah_from_wc resolves dmac for unicast GID in similar way as what ib_resolve_eth_dmac() does. So ib_resolve_eth_dmac is refactored to split for unicast and non unicast GIDs, so that it can be reused by ib_init_ah_from_wc. While we are at refactoring ib_resolve_eth_dmac(), it is further simplified (a) to avoid hoplimit as optional parameter, as there is only one user who always queries hoplimit. (b) for empty line. (c) avoided zero initialization of ret. (d) removed as exported symbol as only ib core uses it. For IPv6, this is tested using simple rping test as below. rping -sv -a ::0 rping -c -a fe80::268a:7ff:fe55:4661%ens2f1 -C 1 -v -d [1] https://www.spinics.net/lists/linux-rdma/msg45690.html [2] https://www.spinics.net/lists/linux-rdma/msg45710.html Signed-off-by: Parav Pandit <parav@mellanox.com> Reviewed-by: Matan Barak <matanb@mellanox.com> Reviewed-by: Mark Bloch <markb@mellanox.com> Reported-by: Roland Dreier <roland@purestorage.com> Signed-off-by: Leon Romanovsky <leon@kernel.org> Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
Diffstat (limited to 'include/rdma')
-rw-r--r--include/rdma/ib_addr.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/include/rdma/ib_addr.h b/include/rdma/ib_addr.h
index 18c564f60e93..d5c3bbb84608 100644
--- a/include/rdma/ib_addr.h
+++ b/include/rdma/ib_addr.h
@@ -134,7 +134,7 @@ int rdma_addr_size(struct sockaddr *addr);
int rdma_addr_find_smac_by_sgid(union ib_gid *sgid, u8 *smac, u16 *vlan_id);
int rdma_addr_find_l2_eth_by_grh(const union ib_gid *sgid,
const union ib_gid *dgid,
- u8 *smac, u16 *vlan_id, int *if_index,
+ u8 *dmac, const struct net_device *ndev,
int *hoplimit);
static inline u16 ib_addr_get_pkey(struct rdma_dev_addr *dev_addr)