| Message ID | 20180829162706.24111f9c@xhacker.debian (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | net: mvneta: some bug fix and trivial improvement | expand |
Hi Jisheng, On mer., août 29 2018, Jisheng Zhang <Jisheng.Zhang@synaptics.com> wrote: > The rx_offset_correction is RX packet offset correction for platforms, > it's not related with SW BM, instead, it's only related with the > platform's NET_SKB_PAD. > But if I undrestood well, the value of rx_offset_correction has an influence only when we use HW BM. However since d93277b9839b ("Revert "arm64: Increase the max granular size""), NET_SKB_PAD is 64 for arm64, so in the end rx_offset_correction is always 0 for recent kernels. Gregory > Fix the issue by reverting to the original behavior. > > Fixes: 562e2f467e71 ("net: mvneta: Improve the buffer allocation method for SWBM") > Signed-off-by: Jisheng Zhang <Jisheng.Zhang@synaptics.com> > --- > drivers/net/ethernet/marvell/mvneta.c | 24 ++++++++++-------------- > 1 file changed, 10 insertions(+), 14 deletions(-) > > diff --git a/drivers/net/ethernet/marvell/mvneta.c b/drivers/net/ethernet/marvell/mvneta.c > index bc80a678abc3..0ce94f6587a5 100644 > --- a/drivers/net/ethernet/marvell/mvneta.c > +++ b/drivers/net/ethernet/marvell/mvneta.c > @@ -2899,21 +2899,18 @@ static void mvneta_rxq_hw_init(struct mvneta_port *pp, > mvreg_write(pp, MVNETA_RXQ_BASE_ADDR_REG(rxq->id), rxq->descs_phys); > mvreg_write(pp, MVNETA_RXQ_SIZE_REG(rxq->id), rxq->size); > > + /* Set Offset */ > + mvneta_rxq_offset_set(pp, rxq, NET_SKB_PAD - pp->rx_offset_correction); > + > /* Set coalescing pkts and time */ > mvneta_rx_pkts_coal_set(pp, rxq, rxq->pkts_coal); > mvneta_rx_time_coal_set(pp, rxq, rxq->time_coal); > > if (!pp->bm_priv) { > - /* Set Offset */ > - mvneta_rxq_offset_set(pp, rxq, 0); > mvneta_rxq_buf_size_set(pp, rxq, pp->frag_size); > mvneta_rxq_bm_disable(pp, rxq); > mvneta_rxq_fill(pp, rxq, rxq->size); > } else { > - /* Set Offset */ > - mvneta_rxq_offset_set(pp, rxq, > - NET_SKB_PAD - pp->rx_offset_correction); > - > mvneta_rxq_bm_enable(pp, rxq); > /* Fill RXQ with buffers from RX pool */ > mvneta_rxq_long_pool_set(pp, rxq); > @@ -4547,7 +4544,13 @@ static int mvneta_probe(struct platform_device *pdev) > SET_NETDEV_DEV(dev, &pdev->dev); > > pp->id = global_port_id++; > - pp->rx_offset_correction = 0; /* not relevant for SW BM */ > + > + /* Set RX packet offset correction for platforms, whose > + * NET_SKB_PAD, exceeds 64B. It should be 64B for 64-bit > + * platforms and 0B for 32-bit ones. > + */ > + pp->rx_offset_correction = > + max(0, NET_SKB_PAD - MVNETA_RX_PKT_OFFSET_CORRECTION); > > /* Obtain access to BM resources if enabled and already initialized */ > bm_node = of_parse_phandle(dn, "buffer-manager", 0); > @@ -4562,13 +4565,6 @@ static int mvneta_probe(struct platform_device *pdev) > pp->bm_priv = NULL; > } > } > - /* Set RX packet offset correction for platforms, whose > - * NET_SKB_PAD, exceeds 64B. It should be 64B for 64-bit > - * platforms and 0B for 32-bit ones. > - */ > - pp->rx_offset_correction = max(0, > - NET_SKB_PAD - > - MVNETA_RX_PKT_OFFSET_CORRECTION); > } > of_node_put(bm_node); > > -- > 2.18.0 >
Hi, On Wed, 29 Aug 2018 11:05:45 +0200 Gregory CLEMENT wrote: > Hi Jisheng, > > On mer., août 29 2018, Jisheng Zhang <Jisheng.Zhang@synaptics.com> wrote: > > > The rx_offset_correction is RX packet offset correction for platforms, > > it's not related with SW BM, instead, it's only related with the > > platform's NET_SKB_PAD. > > > > But if I undrestood well, the value of rx_offset_correction has an > influence only when we use HW BM. The rx_offset_correction is introduced by commit 8d5047cf9ca2 ("net: mvneta: Convert to be 64 bits compatible"). It's to support mvneta on 64bit platforms such as Armada 3700. It's not related with HW BM. > > However since d93277b9839b ("Revert "arm64: Increase the max granular > size""), NET_SKB_PAD is 64 for arm64, so in the end rx_offset_correction > is always 0 for recent kernels. yes, I mentioned this in email "[query] about recent mvneta patches". IMHO, we'd better not rely on the platform's L1_CACHE_BYTES value, we dunno whether the max granular size is increased again in the future. Thanks > > Gregory > > > > Fix the issue by reverting to the original behavior. > > > > Fixes: 562e2f467e71 ("net: mvneta: Improve the buffer allocation method for SWBM") > > Signed-off-by: Jisheng Zhang <Jisheng.Zhang@synaptics.com> > > --- > > drivers/net/ethernet/marvell/mvneta.c | 24 ++++++++++-------------- > > 1 file changed, 10 insertions(+), 14 deletions(-) > > > > diff --git a/drivers/net/ethernet/marvell/mvneta.c b/drivers/net/ethernet/marvell/mvneta.c > > index bc80a678abc3..0ce94f6587a5 100644 > > --- a/drivers/net/ethernet/marvell/mvneta.c > > +++ b/drivers/net/ethernet/marvell/mvneta.c > > @@ -2899,21 +2899,18 @@ static void mvneta_rxq_hw_init(struct mvneta_port *pp, > > mvreg_write(pp, MVNETA_RXQ_BASE_ADDR_REG(rxq->id), rxq->descs_phys); > > mvreg_write(pp, MVNETA_RXQ_SIZE_REG(rxq->id), rxq->size); > > > > + /* Set Offset */ > > + mvneta_rxq_offset_set(pp, rxq, NET_SKB_PAD - pp->rx_offset_correction); > > + > > /* Set coalescing pkts and time */ > > mvneta_rx_pkts_coal_set(pp, rxq, rxq->pkts_coal); > > mvneta_rx_time_coal_set(pp, rxq, rxq->time_coal); > > > > if (!pp->bm_priv) { > > - /* Set Offset */ > > - mvneta_rxq_offset_set(pp, rxq, 0); > > mvneta_rxq_buf_size_set(pp, rxq, pp->frag_size); > > mvneta_rxq_bm_disable(pp, rxq); > > mvneta_rxq_fill(pp, rxq, rxq->size); > > } else { > > - /* Set Offset */ > > - mvneta_rxq_offset_set(pp, rxq, > > - NET_SKB_PAD - pp->rx_offset_correction); > > - > > mvneta_rxq_bm_enable(pp, rxq); > > /* Fill RXQ with buffers from RX pool */ > > mvneta_rxq_long_pool_set(pp, rxq); > > @@ -4547,7 +4544,13 @@ static int mvneta_probe(struct platform_device *pdev) > > SET_NETDEV_DEV(dev, &pdev->dev); > > > > pp->id = global_port_id++; > > - pp->rx_offset_correction = 0; /* not relevant for SW BM */ > > + > > + /* Set RX packet offset correction for platforms, whose > > + * NET_SKB_PAD, exceeds 64B. It should be 64B for 64-bit > > + * platforms and 0B for 32-bit ones. > > + */ > > + pp->rx_offset_correction = > > + max(0, NET_SKB_PAD - MVNETA_RX_PKT_OFFSET_CORRECTION); > > > > /* Obtain access to BM resources if enabled and already initialized */ > > bm_node = of_parse_phandle(dn, "buffer-manager", 0); > > @@ -4562,13 +4565,6 @@ static int mvneta_probe(struct platform_device *pdev) > > pp->bm_priv = NULL; > > } > > } > > - /* Set RX packet offset correction for platforms, whose > > - * NET_SKB_PAD, exceeds 64B. It should be 64B for 64-bit > > - * platforms and 0B for 32-bit ones. > > - */ > > - pp->rx_offset_correction = max(0, > > - NET_SKB_PAD - > > - MVNETA_RX_PKT_OFFSET_CORRECTION); > > } > > of_node_put(bm_node); > > > > -- > > 2.18.0 > > >
diff --git a/drivers/net/ethernet/marvell/mvneta.c b/drivers/net/ethernet/marvell/mvneta.c index bc80a678abc3..0ce94f6587a5 100644 --- a/drivers/net/ethernet/marvell/mvneta.c +++ b/drivers/net/ethernet/marvell/mvneta.c @@ -2899,21 +2899,18 @@ static void mvneta_rxq_hw_init(struct mvneta_port *pp, mvreg_write(pp, MVNETA_RXQ_BASE_ADDR_REG(rxq->id), rxq->descs_phys); mvreg_write(pp, MVNETA_RXQ_SIZE_REG(rxq->id), rxq->size); + /* Set Offset */ + mvneta_rxq_offset_set(pp, rxq, NET_SKB_PAD - pp->rx_offset_correction); + /* Set coalescing pkts and time */ mvneta_rx_pkts_coal_set(pp, rxq, rxq->pkts_coal); mvneta_rx_time_coal_set(pp, rxq, rxq->time_coal); if (!pp->bm_priv) { - /* Set Offset */ - mvneta_rxq_offset_set(pp, rxq, 0); mvneta_rxq_buf_size_set(pp, rxq, pp->frag_size); mvneta_rxq_bm_disable(pp, rxq); mvneta_rxq_fill(pp, rxq, rxq->size); } else { - /* Set Offset */ - mvneta_rxq_offset_set(pp, rxq, - NET_SKB_PAD - pp->rx_offset_correction); - mvneta_rxq_bm_enable(pp, rxq); /* Fill RXQ with buffers from RX pool */ mvneta_rxq_long_pool_set(pp, rxq); @@ -4547,7 +4544,13 @@ static int mvneta_probe(struct platform_device *pdev) SET_NETDEV_DEV(dev, &pdev->dev); pp->id = global_port_id++; - pp->rx_offset_correction = 0; /* not relevant for SW BM */ + + /* Set RX packet offset correction for platforms, whose + * NET_SKB_PAD, exceeds 64B. It should be 64B for 64-bit + * platforms and 0B for 32-bit ones. + */ + pp->rx_offset_correction = + max(0, NET_SKB_PAD - MVNETA_RX_PKT_OFFSET_CORRECTION); /* Obtain access to BM resources if enabled and already initialized */ bm_node = of_parse_phandle(dn, "buffer-manager", 0); @@ -4562,13 +4565,6 @@ static int mvneta_probe(struct platform_device *pdev) pp->bm_priv = NULL; } } - /* Set RX packet offset correction for platforms, whose - * NET_SKB_PAD, exceeds 64B. It should be 64B for 64-bit - * platforms and 0B for 32-bit ones. - */ - pp->rx_offset_correction = max(0, - NET_SKB_PAD - - MVNETA_RX_PKT_OFFSET_CORRECTION); } of_node_put(bm_node);
The rx_offset_correction is RX packet offset correction for platforms, it's not related with SW BM, instead, it's only related with the platform's NET_SKB_PAD. Fix the issue by reverting to the original behavior. Fixes: 562e2f467e71 ("net: mvneta: Improve the buffer allocation method for SWBM") Signed-off-by: Jisheng Zhang <Jisheng.Zhang@synaptics.com> --- drivers/net/ethernet/marvell/mvneta.c | 24 ++++++++++-------------- 1 file changed, 10 insertions(+), 14 deletions(-)