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Date: Sun, 28 Jul 2019 19:35:49 +0200 From: Matteo Croce <mcroce@...hat.com> To: netdev@...r.kernel.org Cc: Antoine Tenart <antoine.tenart@...tlin.com>, Maxime Chevallier <maxime.chevallier@...tlin.com>, Marcin Wojtas <mw@...ihalf.com>, Stefan Chulski <stefanc@...vell.com>, LKML <linux-kernel@...r.kernel.org>, David Miller <davem@...emloft.net> Subject: [PATCH net v2] mvpp2: refactor the HW checksum setup The hardware can only offload checksum calculation on first port due to the Tx FIFO size limitation, and has a maximum L3 offset of 128 bytes. Document this in a comment and move duplicated code in a function. Fixes: 576193f2d579 ("net: mvpp2: jumbo frames support") Signed-off-by: Matteo Croce <mcroce@...hat.com> --- .../net/ethernet/marvell/mvpp2/mvpp2_main.c | 35 ++++++++++++------- 1 file changed, 22 insertions(+), 13 deletions(-) diff --git a/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c b/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c index 937e4b928b94..a99405135046 100644 --- a/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c +++ b/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c @@ -811,6 +811,26 @@ static int mvpp2_swf_bm_pool_init(struct mvpp2_port *port) return 0; } +static void mvpp2_set_hw_csum(struct mvpp2_port *port, + enum mvpp2_bm_pool_log_num new_long_pool) +{ + const netdev_features_t csums = NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM; + + /* Update L4 checksum when jumbo enable/disable on port. + * Only port 0 supports hardware checksum offload due to + * the Tx FIFO size limitation. + * Also, don't set NETIF_F_HW_CSUM because L3_offset in TX descriptor + * has 7 bits, so the maximum L3 offset is 128. + */ + if (new_long_pool == MVPP2_BM_JUMBO && port->id != 0) { + port->dev->features &= ~csums; + port->dev->hw_features &= ~csums; + } else { + port->dev->features |= csums; + port->dev->hw_features |= csums; + } +} + static int mvpp2_bm_update_mtu(struct net_device *dev, int mtu) { struct mvpp2_port *port = netdev_priv(dev); @@ -843,15 +863,7 @@ static int mvpp2_bm_update_mtu(struct net_device *dev, int mtu) /* Add port to new short & long pool */ mvpp2_swf_bm_pool_init(port); - /* Update L4 checksum when jumbo enable/disable on port */ - if (new_long_pool == MVPP2_BM_JUMBO && port->id != 0) { - dev->features &= ~(NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM); - dev->hw_features &= ~(NETIF_F_IP_CSUM | - NETIF_F_IPV6_CSUM); - } else { - dev->features |= NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM; - dev->hw_features |= NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM; - } + mvpp2_set_hw_csum(port, new_long_pool); } dev->mtu = mtu; @@ -5209,10 +5221,7 @@ static int mvpp2_port_probe(struct platform_device *pdev, dev->features |= NETIF_F_NTUPLE; } - if (port->pool_long->id == MVPP2_BM_JUMBO && port->id != 0) { - dev->features &= ~(NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM); - dev->hw_features &= ~(NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM); - } + mvpp2_set_hw_csum(port, port->pool_long->id); dev->vlan_features |= features; dev->gso_max_segs = MVPP2_MAX_TSO_SEGS; -- 2.21.0
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