Hi,
> > Add page_pool_destroy() in bnxt_free_rx_rings() during normal RX ring
> > cleanup, as Ilias has informed us that the following commit has been
> > merged:
> >
> > 1da4bbeffe41 ("net: core: page_pool: add user refcnt and reintroduce
> > page_pool_destroy")
> >
> > The special error handling code to call page_pool_free() can now be
> > removed. bnxt_free_rx_rings() will always be called during normal
> > shutdown or any error paths.
> >
> > Fixes: 322b87ca55f2 ("bnxt_en: add page_pool support")
> > Cc: Ilias Apalodimas <ilias.apalodi...@linaro.org>
> > Cc: Andy Gospodarek <go...@broadcom.com>
> > Signed-off-by: Michael Chan <michael.c...@broadcom.com>
> > ---
> > drivers/net/ethernet/broadcom/bnxt/bnxt.c | 8 ++------
> > 1 file changed, 2 insertions(+), 6 deletions(-)
> >
> > diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt.c
> > b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
> > index e9d3bd8..2b5b0ab 100644
> > --- a/drivers/net/ethernet/broadcom/bnxt/bnxt.c
> > +++ b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
> > @@ -2500,6 +2500,7 @@ static void bnxt_free_rx_rings(struct bnxt *bp)
> > if (xdp_rxq_info_is_reg(&rxr->xdp_rxq))
> > xdp_rxq_info_unreg(&rxr->xdp_rxq);
> >
> > + page_pool_destroy(rxr->page_pool);
> > rxr->page_pool = NULL;
> >
> > kfree(rxr->rx_tpa);
> > @@ -2560,19 +2561,14 @@ static int bnxt_alloc_rx_rings(struct bnxt *bp)
> > return rc;
> >
> > rc = xdp_rxq_info_reg(&rxr->xdp_rxq, bp->dev, i);
> > - if (rc < 0) {
> > - page_pool_free(rxr->page_pool);
> > - rxr->page_pool = NULL;
> > + if (rc < 0)
> > return rc;
> > - }
> >
> > rc = xdp_rxq_info_reg_mem_model(&rxr->xdp_rxq,
> > MEM_TYPE_PAGE_POOL,
> > rxr->page_pool);
> > if (rc) {
> > xdp_rxq_info_unreg(&rxr->xdp_rxq);
> > - page_pool_free(rxr->page_pool);
> > - rxr->page_pool = NULL;
>
> Rather than deleting these lines it would also be acceptable to do:
>
> if (rc) {
> xdp_rxq_info_unreg(&rxr->xdp_rxq);
> - page_pool_free(rxr->page_pool);
> + page_pool_destroy(rxr->page_pool);
> rxr->page_pool = NULL;
> return rc;
> }
>
> but anytime there is a failure to bnxt_alloc_rx_rings the driver will
> immediately follow it up with a call to bnxt_free_rx_rings, so
> page_pool_destroy will be called.
>
> Thanks for pushing this out so quickly!
>
I also can't find page_pool_release_page() or page_pool_put_page() called when
destroying the pool. Can you try to insmod -> do some traffic -> rmmod ?
If there's stale buffers that haven't been unmapped properly you'll get a
WARN_ON for them.
This part was added later on in the API when Jesper fixed in-flight packet
handling
> Acked-by: Andy Gospodarek <go...@broadcom.com>
>
Thanks
/Ilias
