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net: mscc: ocelot: fix incorrect IFH SRC_PORT field in ocelot_ifh_set_basic()

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Packets injected by the CPU should have a SRC_PORT field equal to the
CPU port module index in the Analyzer block (ocelot->num_phys_ports).

The blamed commit copied the ocelot_ifh_set_basic() call incorrectly
from ocelot_xmit_common() in net/dsa/tag_ocelot.c. Instead of calling
with "x", it calls with BIT_ULL(x), but the field is not a port mask,
but rather a single port index.

[ side note: this is the technical debt of code duplication :( ]

The error used to be silent and doesn't appear to have other
user-visible manifestations, but with new changes in the packing
library, it now fails loudly as follows:

------------[ cut here ]------------
Cannot store 0x40 inside bits 46-43 - will truncate
sja1105 spi2.0: xmit timed out
WARNING: CPU: 1 PID: 102 at lib/packing.c:98 __pack+0x90/0x198
sja1105 spi2.0: timed out polling for tstamp
CPU: 1 UID: 0 PID: 102 Comm: felix_xmit
Tainted: G        W        N 6.13.0-rc1-00372-gf706b85d972d-dirty #2605
Call trace:
 __pack+0x90/0x198 (P)
 __pack+0x90/0x198 (L)
 packing+0x78/0x98
 ocelot_ifh_set_basic+0x260/0x368
 ocelot_port_inject_frame+0xa8/0x250
 felix_port_deferred_xmit+0x14c/0x258
 kthread_worker_fn+0x134/0x350
 kthread+0x114/0x138

The code path pertains to the ocelot switchdev driver and to the felix
secondary DSA tag protocol, ocelot-8021q. Here seen with ocelot-8021q.

The messenger (packing) is not really to blame, so fix the original
commit instead.

Fixes: e1b9e80236 ("net: mscc: ocelot: fix QoS class for injected packets with "ocelot-8021q"")
Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Link: https://patch.msgid.link/20241212165546.879567-1-vladimir.oltean@nxp.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Vladimir Oltean 2024-12-12 18:55:45 +02:00 committed by Jakub Kicinski
parent c296c0bf45
commit 2d5df3a680
1 changed files with 1 additions and 1 deletions
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2
drivers/net/ethernet/mscc/ocelot.c
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@ -1432,7 +1432,7 @@ void ocelot_ifh_set_basic(void *ifh, struct ocelot *ocelot, int port,
memset(ifh, 0, OCELOT_TAG_LEN);
ocelot_ifh_set_bypass(ifh, 1);
ocelot_ifh_set_src(ifh, BIT_ULL(ocelot->num_phys_ports));
ocelot_ifh_set_src(ifh, ocelot->num_phys_ports);
ocelot_ifh_set_dest(ifh, BIT_ULL(port));
ocelot_ifh_set_qos_class(ifh, qos_class);
ocelot_ifh_set_tag_type(ifh, tag_type);