diff options
| -rw-r--r-- | src/vnet/interface_output.c | 5 | ||||
| -rw-r--r-- | test/test_gso.py | 32 |
2 files changed, 36 insertions, 1 deletions
diff --git a/src/vnet/interface_output.c b/src/vnet/interface_output.c index c863d444f5a..92cbaac4810 100644 --- a/src/vnet/interface_output.c +++ b/src/vnet/interface_output.c @@ -235,8 +235,11 @@ tso_alloc_tx_bufs (vlib_main_t * vm, vlib_buffer_t * b0, u32 n_bytes_b0, u16 l234_sz, u16 gso_size) { + u16 size = + clib_min (gso_size, vlib_buffer_get_default_data_size (vm) - l234_sz); + /* rounded-up division */ - u16 n_bufs = (n_bytes_b0 - l234_sz + (gso_size - 1)) / gso_size; + u16 n_bufs = (n_bytes_b0 - l234_sz + (size - 1)) / size; u16 n_alloc; ASSERT (n_bufs > 0); diff --git a/test/test_gso.py b/test/test_gso.py index b7d3b98b2e9..87626ccf01f 100644 --- a/test/test_gso.py +++ b/test/test_gso.py @@ -170,5 +170,37 @@ class TestGSO(VppTestCase): size -= 20 # TCP header self.assertEqual(size, 65200) + # + # Send jumbo frame with gso enabled only on input interface with 9K MTU + # and DF bit is unset. GSO packet will be fragmented. GSO size will be + # 8960. + # + self.vapi.sw_interface_set_mtu(self.pg1.sw_if_index, [9000, 0, 0, 0]) + self.create_pg_interfaces(range(5, 6), 1, 8960) + for i in self.pg_interfaces: + i.admin_up() + i.config_ip4() + i.config_ip6() + i.disable_ipv6_ra() + i.resolve_arp() + i.resolve_ndp() + + self.vapi.sw_interface_set_mtu(self.pg5.sw_if_index, [9000, 0, 0, 0]) + p44 = (Ether(src=self.pg5.remote_mac, dst=self.pg5.local_mac) / + IP(src=self.pg5.remote_ip4, dst=self.pg1.remote_ip4) / + TCP(sport=1234, dport=1234) / + Raw('\xa5' * 65200)) + + self.pg1.enable_capture() + rxs = self.send_and_expect(self.pg5, [p44], self.pg1, 33) + size = 0 + for rx in rxs: + self.assertEqual(rx[Ether].src, self.pg1.local_mac) + self.assertEqual(rx[Ether].dst, self.pg1.remote_mac) + self.assertEqual(rx[IP].src, self.pg5.remote_ip4) + self.assertEqual(rx[IP].dst, self.pg1.remote_ip4) + size = rxs[32][TCP].seq + rxs[32][IP].len - 20 - 20 + self.assertEqual(size, 65200) + if __name__ == '__main__': unittest.main(testRunner=VppTestRunner) |