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openvswitch: add OVS_DP_ATTR_PER_CPU_PIDS to get requests

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CRIU needs OVS_DP_ATTR_PER_CPU_PIDS to checkpoint/restore newest
openvswitch versions.
Add pids to generic datapath reply. Limit exported pids amount to
nr_cpu_ids.

Signed-off-by: Andrey Zhadchenko <andrey.zhadchenko@virtuozzo.com>
Acked-by: Christian Brauner (Microsoft) <brauner@kernel.org>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Andrey Zhadchenko 2022-08-25 05:04:50 +03:00 committed by Jakub Kicinski
parent 54c4ef34c4
commit 347541e299
1 changed files with 9 additions and 1 deletions
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10
net/openvswitch/datapath.c
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@ -1523,6 +1523,7 @@ static size_t ovs_dp_cmd_msg_size(void)
msgsize += nla_total_size_64bit(sizeof(struct ovs_dp_megaflow_stats));
msgsize += nla_total_size(sizeof(u32)); /* OVS_DP_ATTR_USER_FEATURES */
msgsize += nla_total_size(sizeof(u32)); /* OVS_DP_ATTR_MASKS_CACHE_SIZE */
msgsize += nla_total_size(sizeof(u32) * nr_cpu_ids); /* OVS_DP_ATTR_PER_CPU_PIDS */
return msgsize;
}
@ -1534,7 +1535,8 @@ static int ovs_dp_cmd_fill_info(struct datapath *dp, struct sk_buff *skb,
struct ovs_header *ovs_header;
struct ovs_dp_stats dp_stats;
struct ovs_dp_megaflow_stats dp_megaflow_stats;
int err;
struct dp_nlsk_pids *pids = ovsl_dereference(dp->upcall_portids);
int err, pids_len;
ovs_header = genlmsg_put(skb, portid, seq, &dp_datapath_genl_family,
flags, cmd);
@ -1564,6 +1566,12 @@ static int ovs_dp_cmd_fill_info(struct datapath *dp, struct sk_buff *skb,
ovs_flow_tbl_masks_cache_size(&dp->table)))
goto nla_put_failure;
if (dp->user_features & OVS_DP_F_DISPATCH_UPCALL_PER_CPU && pids) {
pids_len = min(pids->n_pids, nr_cpu_ids) * sizeof(u32);
if (nla_put(skb, OVS_DP_ATTR_PER_CPU_PIDS, pids_len, &pids->pids))
goto nla_put_failure;
}
genlmsg_end(skb, ovs_header);
return 0;