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SubjectRe: [RFC PATCH net-next 1/1] cxgb4: fix missing unlock on ETHOFLD desc collect fail path
On Thursday, September 09/22/22, 2022 at 02:32:36 -0300, Rafael Mendonca wrote:
> The label passed to the QDESC_GET for the ETHOFLD TXQ, RXQ, and FLQ, is the
> 'out' one, which skips the 'out_unlock' label, and thus doesn't unlock the
> 'uld_mutex' before returning. Additionally, since commit 5148e5950c67
> ("cxgb4: add EOTID tracking and software context dump"), the access to
> these ETHOFLD hardware queues should be protected by the 'mqprio_mutex'
> instead.
>
> Fixes: 2d0cb84dd973 ("cxgb4: add ETHOFLD hardware queue support")
> Fixes: 5148e5950c67 ("cxgb4: add EOTID tracking and software context dump")
> Signed-off-by: Rafael Mendonca <rafaelmendsr@gmail.com>

Yes, the ETHOFLD queues do need to be accessed after unlocking the
uld_mutex and then taking the mqprio_mutex. Thanks for the fix!

Reviewed-by: Rahul Lakkireddy <rahul.lakkireddy@chelsio.com>


> ---
> .../net/ethernet/chelsio/cxgb4/cudbg_lib.c | 28 +++++++++++++------
> 1 file changed, 19 insertions(+), 9 deletions(-)
>
> diff --git a/drivers/net/ethernet/chelsio/cxgb4/cudbg_lib.c b/drivers/net/ethernet/chelsio/cxgb4/cudbg_lib.c
> index a7f291c89702..557c591a6ce3 100644
> --- a/drivers/net/ethernet/chelsio/cxgb4/cudbg_lib.c
> +++ b/drivers/net/ethernet/chelsio/cxgb4/cudbg_lib.c
> @@ -14,6 +14,7 @@
> #include "cudbg_entity.h"
> #include "cudbg_lib.h"
> #include "cudbg_zlib.h"
> +#include "cxgb4_tc_mqprio.h"
>
> static const u32 t6_tp_pio_array[][IREG_NUM_ELEM] = {
> {0x7e40, 0x7e44, 0x020, 28}, /* t6_tp_pio_regs_20_to_3b */
> @@ -3458,7 +3459,7 @@ int cudbg_collect_qdesc(struct cudbg_init *pdbg_init,
> for (i = 0; i < utxq->ntxq; i++)
> QDESC_GET_TXQ(&utxq->uldtxq[i].q,
> cudbg_uld_txq_to_qtype(j),
> - out_unlock);
> + out_unlock_uld);
> }
> }
>
> @@ -3475,7 +3476,7 @@ int cudbg_collect_qdesc(struct cudbg_init *pdbg_init,
> for (i = 0; i < urxq->nrxq; i++)
> QDESC_GET_RXQ(&urxq->uldrxq[i].rspq,
> cudbg_uld_rxq_to_qtype(j),
> - out_unlock);
> + out_unlock_uld);
> }
>
> /* ULD FLQ */
> @@ -3487,7 +3488,7 @@ int cudbg_collect_qdesc(struct cudbg_init *pdbg_init,
> for (i = 0; i < urxq->nrxq; i++)
> QDESC_GET_FLQ(&urxq->uldrxq[i].fl,
> cudbg_uld_flq_to_qtype(j),
> - out_unlock);
> + out_unlock_uld);
> }
>
> /* ULD CIQ */
> @@ -3500,29 +3501,34 @@ int cudbg_collect_qdesc(struct cudbg_init *pdbg_init,
> for (i = 0; i < urxq->nciq; i++)
> QDESC_GET_RXQ(&urxq->uldrxq[base + i].rspq,
> cudbg_uld_ciq_to_qtype(j),
> - out_unlock);
> + out_unlock_uld);
> }
> }
> + mutex_unlock(&uld_mutex);
> +
> + if (!padap->tc_mqprio)
> + goto out;
>
> + mutex_lock(&padap->tc_mqprio->mqprio_mutex);
> /* ETHOFLD TXQ */
> if (s->eohw_txq)
> for (i = 0; i < s->eoqsets; i++)
> QDESC_GET_TXQ(&s->eohw_txq[i].q,
> - CUDBG_QTYPE_ETHOFLD_TXQ, out);
> + CUDBG_QTYPE_ETHOFLD_TXQ, out_unlock_mqprio);
>
> /* ETHOFLD RXQ and FLQ */
> if (s->eohw_rxq) {
> for (i = 0; i < s->eoqsets; i++)
> QDESC_GET_RXQ(&s->eohw_rxq[i].rspq,
> - CUDBG_QTYPE_ETHOFLD_RXQ, out);
> + CUDBG_QTYPE_ETHOFLD_RXQ, out_unlock_mqprio);
>
> for (i = 0; i < s->eoqsets; i++)
> QDESC_GET_FLQ(&s->eohw_rxq[i].fl,
> - CUDBG_QTYPE_ETHOFLD_FLQ, out);
> + CUDBG_QTYPE_ETHOFLD_FLQ, out_unlock_mqprio);
> }
>
> -out_unlock:
> - mutex_unlock(&uld_mutex);
> +out_unlock_mqprio:
> + mutex_unlock(&padap->tc_mqprio->mqprio_mutex);
>
> out:
> qdesc_info->qdesc_entry_size = sizeof(*qdesc_entry);
> @@ -3559,6 +3565,10 @@ int cudbg_collect_qdesc(struct cudbg_init *pdbg_init,
> #undef QDESC_GET
>
> return rc;
> +
> +out_unlock_uld:
> + mutex_unlock(&uld_mutex);
> + goto out;
> }
>
> int cudbg_collect_flash(struct cudbg_init *pdbg_init,
> --
> 2.34.1
>

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