| Message ID | 20210805145511.12016-1-grygorii.strashko@ti.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | [net,v2] net: ethernet: ti: cpsw: fix min eth packet size for non-switch use-cases | expand |
On 05/08/2021 17:55, Grygorii Strashko wrote: > The CPSW switchdev driver inherited fix from commit 9421c9015047 ("net: > ethernet: ti: cpsw: fix min eth packet size") which changes min TX packet > size to 64bytes (VLAN_ETH_ZLEN, excluding ETH_FCS). It was done to fix HW > packed drop issue when packets are sent from Host to the port with PVID and > un-tagging enabled. Unfortunately this breaks some other non-switch > specific use-cases, like: > - [1] CPSW port as DSA CPU port with DSA-tag applied at the end of the > packet > - [2] Some industrial protocols, which expects min TX packet size 60Bytes > (excluding FCS). > > Fix it by configuring min TX packet size depending on driver mode > - 60Bytes (ETH_ZLEN) for multi mac (dual-mac) mode > - 64Bytes (VLAN_ETH_ZLEN) for switch mode > and update it during driver mode change and annotate with > READ_ONCE()/WRITE_ONCE() as it can be read by napi while writing. > > [1] https://lore.kernel.org/netdev/20210531124051.GA15218@cephalopod/ > [2] https://e2e.ti.com/support/arm/sitara_arm/f/791/t/701669 > > > Cc: stable@vger.kernel.org > Fixes: ed3525eda4c4 ("net: ethernet: ti: introduce cpsw switchdev based driver part 1 - dual-emac") > Reported-by: Ben Hutchings <ben.hutchings@essensium.com> > Signed-off-by: Grygorii Strashko <grygorii.strashko@ti.com> > --- > > Changes in v2: > - use skb_put_padto > - update description > - annotate tx_packet_min with READ_ONCE()/WRITE_ONCE() > > I'm not going to add additional changes in cpdma configuration interface and, > instead, will send patches to convert all cpdma users to use skb_put_padto() and > drop frames padding from cpdma. > > v1: https://patchwork.kernel.org/project/netdevbpf/patch/20210611132732.10690-1-grygorii.strashko@ti.com/ > > drivers/net/ethernet/ti/cpsw_new.c | 7 +++++-- > drivers/net/ethernet/ti/cpsw_priv.h | 4 +++- > 2 files changed, 8 insertions(+), 3 deletions(-) > Cc: Ilias Apalodimas <ilias.apalodimas@linaro.org> > diff --git a/drivers/net/ethernet/ti/cpsw_new.c b/drivers/net/ethernet/ti/cpsw_new.c > index ae167223e87f..d904f4ca4b37 100644 > --- a/drivers/net/ethernet/ti/cpsw_new.c > +++ b/drivers/net/ethernet/ti/cpsw_new.c > @@ -921,7 +921,7 @@ static netdev_tx_t cpsw_ndo_start_xmit(struct sk_buff *skb, > struct cpdma_chan *txch; > int ret, q_idx; > > - if (skb_padto(skb, CPSW_MIN_PACKET_SIZE)) { > + if (skb_put_padto(skb, READ_ONCE(priv->tx_packet_min))) { > cpsw_err(priv, tx_err, "packet pad failed\n"); > ndev->stats.tx_dropped++; > return NET_XMIT_DROP; > @@ -1101,7 +1101,7 @@ static int cpsw_ndo_xdp_xmit(struct net_device *ndev, int n, > > for (i = 0; i < n; i++) { > xdpf = frames[i]; > - if (xdpf->len < CPSW_MIN_PACKET_SIZE) > + if (xdpf->len < READ_ONCE(priv->tx_packet_min)) > break; > > if (cpsw_xdp_tx_frame(priv, xdpf, NULL, priv->emac_port)) > @@ -1390,6 +1390,7 @@ static int cpsw_create_ports(struct cpsw_common *cpsw) > priv->dev = dev; > priv->msg_enable = netif_msg_init(debug_level, CPSW_DEBUG); > priv->emac_port = i + 1; > + priv->tx_packet_min = CPSW_MIN_PACKET_SIZE; > > if (is_valid_ether_addr(slave_data->mac_addr)) { > ether_addr_copy(priv->mac_addr, slave_data->mac_addr); > @@ -1698,6 +1699,7 @@ static int cpsw_dl_switch_mode_set(struct devlink *dl, u32 id, > > priv = netdev_priv(sl_ndev); > slave->port_vlan = vlan; > + WRITE_ONCE(priv->tx_packet_min, CPSW_MIN_PACKET_SIZE_VLAN); > if (netif_running(sl_ndev)) > cpsw_port_add_switch_def_ale_entries(priv, > slave); > @@ -1726,6 +1728,7 @@ static int cpsw_dl_switch_mode_set(struct devlink *dl, u32 id, > > priv = netdev_priv(slave->ndev); > slave->port_vlan = slave->data->dual_emac_res_vlan; > + WRITE_ONCE(priv->tx_packet_min, CPSW_MIN_PACKET_SIZE); > cpsw_port_add_dual_emac_def_ale_entries(priv, slave); > } > > diff --git a/drivers/net/ethernet/ti/cpsw_priv.h b/drivers/net/ethernet/ti/cpsw_priv.h > index a323bea54faa..2951fb7b9dae 100644 > --- a/drivers/net/ethernet/ti/cpsw_priv.h > +++ b/drivers/net/ethernet/ti/cpsw_priv.h > @@ -89,7 +89,8 @@ do { \ > > #define CPSW_POLL_WEIGHT 64 > #define CPSW_RX_VLAN_ENCAP_HDR_SIZE 4 > -#define CPSW_MIN_PACKET_SIZE (VLAN_ETH_ZLEN) > +#define CPSW_MIN_PACKET_SIZE_VLAN (VLAN_ETH_ZLEN) > +#define CPSW_MIN_PACKET_SIZE (ETH_ZLEN) > #define CPSW_MAX_PACKET_SIZE (VLAN_ETH_FRAME_LEN +\ > ETH_FCS_LEN +\ > CPSW_RX_VLAN_ENCAP_HDR_SIZE) > @@ -380,6 +381,7 @@ struct cpsw_priv { > u32 emac_port; > struct cpsw_common *cpsw; > int offload_fwd_mark; > + u32 tx_packet_min; > }; > > #define ndev_to_cpsw(ndev) (((struct cpsw_priv *)netdev_priv(ndev))->cpsw) >
Hello: This patch was applied to netdev/net.git (refs/heads/master): On Thu, 5 Aug 2021 17:55:11 +0300 you wrote: > The CPSW switchdev driver inherited fix from commit 9421c9015047 ("net: > ethernet: ti: cpsw: fix min eth packet size") which changes min TX packet > size to 64bytes (VLAN_ETH_ZLEN, excluding ETH_FCS). It was done to fix HW > packed drop issue when packets are sent from Host to the port with PVID and > un-tagging enabled. Unfortunately this breaks some other non-switch > specific use-cases, like: > - [1] CPSW port as DSA CPU port with DSA-tag applied at the end of the > packet > - [2] Some industrial protocols, which expects min TX packet size 60Bytes > (excluding FCS). > > [...] Here is the summary with links: - [net,v2] net: ethernet: ti: cpsw: fix min eth packet size for non-switch use-cases https://git.kernel.org/netdev/net/c/acc68b8d2a11 You are awesome, thank you! -- Deet-doot-dot, I am a bot. https://korg.docs.kernel.org/patchwork/pwbot.html
diff --git a/drivers/net/ethernet/ti/cpsw_new.c b/drivers/net/ethernet/ti/cpsw_new.c index ae167223e87f..d904f4ca4b37 100644 --- a/drivers/net/ethernet/ti/cpsw_new.c +++ b/drivers/net/ethernet/ti/cpsw_new.c @@ -921,7 +921,7 @@ static netdev_tx_t cpsw_ndo_start_xmit(struct sk_buff *skb, struct cpdma_chan *txch; int ret, q_idx; - if (skb_padto(skb, CPSW_MIN_PACKET_SIZE)) { + if (skb_put_padto(skb, READ_ONCE(priv->tx_packet_min))) { cpsw_err(priv, tx_err, "packet pad failed\n"); ndev->stats.tx_dropped++; return NET_XMIT_DROP; @@ -1101,7 +1101,7 @@ static int cpsw_ndo_xdp_xmit(struct net_device *ndev, int n, for (i = 0; i < n; i++) { xdpf = frames[i]; - if (xdpf->len < CPSW_MIN_PACKET_SIZE) + if (xdpf->len < READ_ONCE(priv->tx_packet_min)) break; if (cpsw_xdp_tx_frame(priv, xdpf, NULL, priv->emac_port)) @@ -1390,6 +1390,7 @@ static int cpsw_create_ports(struct cpsw_common *cpsw) priv->dev = dev; priv->msg_enable = netif_msg_init(debug_level, CPSW_DEBUG); priv->emac_port = i + 1; + priv->tx_packet_min = CPSW_MIN_PACKET_SIZE; if (is_valid_ether_addr(slave_data->mac_addr)) { ether_addr_copy(priv->mac_addr, slave_data->mac_addr); @@ -1698,6 +1699,7 @@ static int cpsw_dl_switch_mode_set(struct devlink *dl, u32 id, priv = netdev_priv(sl_ndev); slave->port_vlan = vlan; + WRITE_ONCE(priv->tx_packet_min, CPSW_MIN_PACKET_SIZE_VLAN); if (netif_running(sl_ndev)) cpsw_port_add_switch_def_ale_entries(priv, slave); @@ -1726,6 +1728,7 @@ static int cpsw_dl_switch_mode_set(struct devlink *dl, u32 id, priv = netdev_priv(slave->ndev); slave->port_vlan = slave->data->dual_emac_res_vlan; + WRITE_ONCE(priv->tx_packet_min, CPSW_MIN_PACKET_SIZE); cpsw_port_add_dual_emac_def_ale_entries(priv, slave); } diff --git a/drivers/net/ethernet/ti/cpsw_priv.h b/drivers/net/ethernet/ti/cpsw_priv.h index a323bea54faa..2951fb7b9dae 100644 --- a/drivers/net/ethernet/ti/cpsw_priv.h +++ b/drivers/net/ethernet/ti/cpsw_priv.h @@ -89,7 +89,8 @@ do { \ #define CPSW_POLL_WEIGHT 64 #define CPSW_RX_VLAN_ENCAP_HDR_SIZE 4 -#define CPSW_MIN_PACKET_SIZE (VLAN_ETH_ZLEN) +#define CPSW_MIN_PACKET_SIZE_VLAN (VLAN_ETH_ZLEN) +#define CPSW_MIN_PACKET_SIZE (ETH_ZLEN) #define CPSW_MAX_PACKET_SIZE (VLAN_ETH_FRAME_LEN +\ ETH_FCS_LEN +\ CPSW_RX_VLAN_ENCAP_HDR_SIZE) @@ -380,6 +381,7 @@ struct cpsw_priv { u32 emac_port; struct cpsw_common *cpsw; int offload_fwd_mark; + u32 tx_packet_min; }; #define ndev_to_cpsw(ndev) (((struct cpsw_priv *)netdev_priv(ndev))->cpsw)
The CPSW switchdev driver inherited fix from commit 9421c9015047 ("net: ethernet: ti: cpsw: fix min eth packet size") which changes min TX packet size to 64bytes (VLAN_ETH_ZLEN, excluding ETH_FCS). It was done to fix HW packed drop issue when packets are sent from Host to the port with PVID and un-tagging enabled. Unfortunately this breaks some other non-switch specific use-cases, like: - [1] CPSW port as DSA CPU port with DSA-tag applied at the end of the packet - [2] Some industrial protocols, which expects min TX packet size 60Bytes (excluding FCS). Fix it by configuring min TX packet size depending on driver mode - 60Bytes (ETH_ZLEN) for multi mac (dual-mac) mode - 64Bytes (VLAN_ETH_ZLEN) for switch mode and update it during driver mode change and annotate with READ_ONCE()/WRITE_ONCE() as it can be read by napi while writing. [1] https://lore.kernel.org/netdev/20210531124051.GA15218@cephalopod/ [2] https://e2e.ti.com/support/arm/sitara_arm/f/791/t/701669 Cc: stable@vger.kernel.org Fixes: ed3525eda4c4 ("net: ethernet: ti: introduce cpsw switchdev based driver part 1 - dual-emac") Reported-by: Ben Hutchings <ben.hutchings@essensium.com> Signed-off-by: Grygorii Strashko <grygorii.strashko@ti.com> --- Changes in v2: - use skb_put_padto - update description - annotate tx_packet_min with READ_ONCE()/WRITE_ONCE() I'm not going to add additional changes in cpdma configuration interface and, instead, will send patches to convert all cpdma users to use skb_put_padto() and drop frames padding from cpdma. v1: https://patchwork.kernel.org/project/netdevbpf/patch/20210611132732.10690-1-grygorii.strashko@ti.com/ drivers/net/ethernet/ti/cpsw_new.c | 7 +++++-- drivers/net/ethernet/ti/cpsw_priv.h | 4 +++- 2 files changed, 8 insertions(+), 3 deletions(-)