6.6-stable review patch. If anyone has any objections, please let me know.
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From: Ioana Ciornei ioana.ciornei@nxp.com
[ Upstream commit 2690cb089502b80b905f2abdafd1bf2d54e1abef ]
Starting with commit c50e7475961c ("dpaa2-switch: Fix error checking in dpaa2_switch_seed_bp()"), the probing of a second DPSW object errors out like below.
fsl_dpaa2_switch dpsw.1: fsl_mc_driver_probe failed: -12 fsl_dpaa2_switch dpsw.1: probe with driver fsl_dpaa2_switch failed with error -12
The aforementioned commit brought to the surface the fact that seeding buffers into the buffer pool destined for control traffic is not successful and an access violation recoverable error can be seen in the MC firmware log:
[E, qbman_rec_isr:391, QBMAN] QBMAN recoverable event 0x1000000
This happens because the driver incorrectly used the ID of the DPBP object instead of the hardware buffer pool ID when trying to release buffers into it.
This is because any DPSW object uses two buffer pools, one managed by the Linux driver and destined for control traffic packet buffers and the other one managed by the MC firmware and destined only for offloaded traffic. And since the buffer pool managed by the MC firmware does not have an external facing DPBP equivalent, any subsequent DPBP objects created after the first DPSW will have a DPBP id different to the underlying hardware buffer ID.
The issue was not caught earlier because these two numbers can be identical when all DPBP objects are created before the DPSW objects are. This is the case when the DPL file is used to describe the entire DPAA2 object layout and objects are created at boot time and it's also true for the first DPSW being created dynamically using ls-addsw.
Fix this by using the buffer pool ID instead of the DPBP id when releasing buffers into the pool.
Fixes: 2877e4f7e189 ("staging: dpaa2-switch: setup buffer pool and RX path rings") Signed-off-by: Ioana Ciornei ioana.ciornei@nxp.com Link: https://patch.msgid.link/20250910144825.2416019-1-ioana.ciornei@nxp.com Signed-off-by: Jakub Kicinski kuba@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/net/ethernet/freescale/dpaa2/dpaa2-switch.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/net/ethernet/freescale/dpaa2/dpaa2-switch.c b/drivers/net/ethernet/freescale/dpaa2/dpaa2-switch.c index 76795bb0b564b..cdab37e9634d4 100644 --- a/drivers/net/ethernet/freescale/dpaa2/dpaa2-switch.c +++ b/drivers/net/ethernet/freescale/dpaa2/dpaa2-switch.c @@ -2700,7 +2700,7 @@ static int dpaa2_switch_setup_dpbp(struct ethsw_core *ethsw) dev_err(dev, "dpsw_ctrl_if_set_pools() failed\n"); goto err_get_attr; } - ethsw->bpid = dpbp_attrs.id; + ethsw->bpid = dpbp_attrs.bpid;
return 0;