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dpif-linux: Fix a bug in creating port.

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Based on the policy of 'OVS_VPORT_ATTR_UPCALL_PID', if upcall should
not be sent to userspace (i.e. the number of handler threads is zero),
the netlink message for creating vport should be an one-element array of
value 0.  However, dpif_linux_port_add__() fails to obey it and generates
zero-payload netlink message which causes the netlink transaction failing
with ERANGE error.

This is particularly bad when the 'flow-restore-wait' is set during upgrade,
since number of handler threads is not set in dpif-linux module and ovs is
not able to add port in datapath until the 'flow-restore-wait' is disabled.
Connection may lose due to this bug.

This bug was introduced by commit 1579cf677f (dpif-linux: Implement the
API functions to allow multiple handler threads read upcall.).

This commit fixes the bug by fixing the dpif_linux_port_add__() to generate
the correct netlink message when the number of handler threads is not set.

Bug #1239914.
Bug #1240598.
Bug #1240626.

Reported-by: Gurucharan Shetty <gshetty@nicira.com>
Signed-off-by: Alex Wang <alexw@nicira.com>
Acked-by: Ben Pfaff <blp@nicira.com>
This commit is contained in:
Alex Wang
2014-04-28 22:05:05 -07:00
parent 60cda7d69b
commit aeaae11fce
1 changed files with 1 additions and 1 deletions
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2
lib/dpif-linux.c
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@@ -676,7 +676,7 @@ dpif_linux_port_add__(struct dpif_linux *dpif, struct netdev *netdev,
request.port_no = *port_nop;
upcall_pids = vport_socksp_to_pids(socksp, dpif->n_handlers);
request.n_upcall_pids = dpif->n_handlers;
request.n_upcall_pids = socksp ? dpif->n_handlers : 1;
request.upcall_pids = upcall_pids;
error = dpif_linux_vport_transact(&request, &reply, &buf);