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Thu, 29 Oct 2020 03:37:48 -0700 (PDT) Date: Thu, 29 Oct 2020 11:37:45 +0100 From: Lorenzo Bianconi To: Ilias Apalodimas Cc: Lorenzo Bianconi , netdev@vger.kernel.org, bpf@vger.kernel.org, davem@davemloft.net, kuba@kernel.org, brouer@redhat.com Subject: Re: [PATCH net-next 2/4] net: page_pool: add bulk support for ptr_ring Message-ID: <20201029103745.GC15697@lore-desk> References: <20201029072526.GA61828@apalos.home> MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="hOcCNbCCxyk/YU74" Content-Disposition: inline In-Reply-To: <20201029072526.GA61828@apalos.home> Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org --hOcCNbCCxyk/YU74 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable > On Tue, Oct 27, 2020 at 08:04:08PM +0100, Lorenzo Bianconi wrote: > > Introduce the capability to batch page_pool ptr_ring refill since it is > > usually run inside the driver NAPI tx completion loop. > >=20 > > Suggested-by: Jesper Dangaard Brouer > > Signed-off-by: Lorenzo Bianconi > > --- > > include/net/page_pool.h | 26 ++++++++++++++++++++++++++ > > net/core/page_pool.c | 33 +++++++++++++++++++++++++++++++++ > > net/core/xdp.c | 9 ++------- > > 3 files changed, 61 insertions(+), 7 deletions(-) > >=20 > > diff --git a/include/net/page_pool.h b/include/net/page_pool.h > > index 81d7773f96cd..b5b195305346 100644 [...] > > +void page_pool_put_page_bulk(struct page_pool *pool, void **data, > > + int count) > > +{ > > + struct page *page_ring[XDP_BULK_QUEUE_SIZE]; > > + int i, len =3D 0; > > + > > + for (i =3D 0; i < count; i++) { > > + struct page *page =3D virt_to_head_page(data[i]); > > + > > + if (unlikely(page_ref_count(page) !=3D 1 || > > + !pool_page_reusable(pool, page))) { > > + page_pool_release_page(pool, page); > > + put_page(page); > > + continue; > > + } > > + > > + if (pool->p.flags & PP_FLAG_DMA_SYNC_DEV) > > + page_pool_dma_sync_for_device(pool, page, -1); > > + > > + page_ring[len++] =3D page; > > + } > > + > > + page_pool_ring_lock(pool); > > + for (i =3D 0; i < len; i++) { > > + if (__ptr_ring_produce(&pool->ring, page_ring[i])) > > + page_pool_return_page(pool, page_ring[i]); >=20 > Can we add a comment here on why the explicit spinlock needs to protect= =20 > page_pool_return_page() as well instead of just using ptr_ring_produce()? ack, will do in v2. Regards, Lorenzo >=20 > > + } > > + page_pool_ring_unlock(pool); > > +} > > +EXPORT_SYMBOL(page_pool_put_page_bulk); > > + > > static void page_pool_empty_ring(struct page_pool *pool) > > { > > struct page *page; > > diff --git a/net/core/xdp.c b/net/core/xdp.c > > index 93eabd789246..9f9a8d14df38 100644 > > --- a/net/core/xdp.c > > +++ b/net/core/xdp.c > > @@ -383,16 +383,11 @@ EXPORT_SYMBOL_GPL(xdp_return_frame_rx_napi); > > void xdp_flush_frame_bulk(struct xdp_frame_bulk *bq) > > { > > struct xdp_mem_allocator *xa =3D bq->xa; > > - int i; > > =20 > > - if (unlikely(!xa)) > > + if (unlikely(!xa || !bq->count)) > > return; > > =20 > > - for (i =3D 0; i < bq->count; i++) { > > - struct page *page =3D virt_to_head_page(bq->q[i]); > > - > > - page_pool_put_full_page(xa->page_pool, page, false); > > - } > > + page_pool_put_page_bulk(xa->page_pool, bq->q, bq->count); > > bq->count =3D 0; > > } > > EXPORT_SYMBOL_GPL(xdp_flush_frame_bulk); > > --=20 > > 2.26.2 > >=20 >=20 > Thanks > /Ilias >=20 --hOcCNbCCxyk/YU74 Content-Type: application/pgp-signature; name="signature.asc" -----BEGIN PGP SIGNATURE----- iHUEABYIAB0WIQTquNwa3Txd3rGGn7Y6cBh0uS2trAUCX5qbdwAKCRA6cBh0uS2t rPbSAQDV0Nbla02xYvnDQ/pk0LPM6cNtuOKKYd9EFguupAe+uQD+IwBpLxguInNI gRSok5ptbUBSZ5fDR5y0geCxhoGccAE= =4+Fo -----END PGP SIGNATURE----- --hOcCNbCCxyk/YU74--