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| author |   Andrew Yourtchenko <ayourtch@gmail.com> | 2024-09-17 15:01:44 +0200 |
|---|---|---|
| committer |   Damjan Marion <dmarion@0xa5.net> | 2024-09-19 14:31:36 +0000 |
| commit | 33e1243a4c8fcd07282dd1c7b7b27d904dcd0b2e (patch) | |
| tree | 760843f9e31a3ec5e9a6b971c7b7d7ae1ccbdcb6 /src/vnet | |
| parent | 3ecd6840af4f890a11d26628ac34d31786b16758 (diff) | |
l2: fix DVR test failure on AWS Graviton on Ubuntu 22.04
The AWS Graviton make test fails in dvr_test.py on Ubuntu 22.04,
due to a mismatching source MAC address. Debian 11 tests run fine.
The following can be seen in the log.txt trace:
00:00:00:756422: ethernet-input
frame: flags 0x1, hw-if-index 3, sw-if-index 3
IP4: 02:03:00:00:ff:02 -> de:ad:00:00:00:00 802.1q vlan 92
00:00:00:756435: l2-input
l2-input: sw_if_index 6 dst de:ad:00:00:00:00 src 02:03:00:00:ff:02 [l2-input-vtr l2-learn l2-fwd l2-flood l2-flood ]
00:00:00:756438: l2-input-vtr
l2-input-vtr: sw_if_index 6 dst de:ad:00:00:00:00 src 02:03:00:00:00:00 data 08 00 45 00 00 80 00 01 00 00 40 11
00:00:00:756441: l2-learn
l2-learn: sw_if_index 6 dst de:ad:00:00:00:00 src 02:03:00:00:00:00 bd_index 1
Note how l2-input-vtr node has the two lowest bytes of the source MAC corrupted.
Discussing with Benoit, since this could be caused by unaligned memory accesses,
using clib_memcpy_fast.
Type: fix
Change-Id: I28991e1166335df0edd1e4b84fa72a2b1d0bb9bf
Signed-off-by: Andrew Yourtchenko <ayourtch@gmail.com>
Diffstat (limited to 'src/vnet')
| -rw-r--r-- | src/vnet/l2/l2_vtr.h | 13 |
1 files changed, 5 insertions, 8 deletions
diff --git a/src/vnet/l2/l2_vtr.h b/src/vnet/l2/l2_vtr.h index 1cd9209973b..40285873273 100644 --- a/src/vnet/l2/l2_vtr.h +++ b/src/vnet/l2/l2_vtr.h @@ -75,15 +75,13 @@ typedef struct always_inline u32 l2_vtr_process (vlib_buffer_t * b0, vtr_config_t * config) { - u64 temp_8; - u32 temp_4; u8 *eth; + u8 save_macs[12]; eth = vlib_buffer_get_current (b0); /* copy the 12B dmac and smac to a temporary location */ - temp_8 = *((u64 *) eth); - temp_4 = *((u32 *) (eth + 8)); + clib_memcpy_fast (save_macs, eth, sizeof (save_macs)); /* adjust for popped tags */ eth += config->pop_bytes; @@ -95,7 +93,8 @@ l2_vtr_process (vlib_buffer_t * b0, vtr_config_t * config) } /* copy the 2 new tags to the start of the packet */ - *((u64 *) (eth + 12 - 8)) = config->raw_tags; + clib_memcpy_fast (eth + 12 - 8, &config->raw_tags, + sizeof (config->raw_tags)); /* TODO: set cos bits */ @@ -103,8 +102,7 @@ l2_vtr_process (vlib_buffer_t * b0, vtr_config_t * config) eth -= config->push_bytes; /* copy the 12 dmac and smac back to the packet */ - *((u64 *) eth) = temp_8; - *((u32 *) (eth + 8)) = temp_4; + clib_memcpy_fast (eth, save_macs, sizeof (save_macs)); /* Update l2 parameters */ vnet_buffer (b0)->l2.l2_len += @@ -124,7 +122,6 @@ l2_vtr_process (vlib_buffer_t * b0, vtr_config_t * config) return 0; } - /* * Perform the egress pre-vlan tag rewrite EFP Filter check. * The post-vlan tag rewrite check is a separate graph node. |