From 368e36ed4c76a408608091045914f9a3d11d7209 Mon Sep 17 00:00:00 2001 From: David L Stevens Date: Tue, 2 Dec 2014 15:31:38 -0500 Subject: sunvnet: add TSO support This patch adds TSO support for the sunvnet driver. Signed-off-by: David L Stevens Signed-off-by: David S. Miller --- drivers/net/ethernet/sun/sunvnet.c | 95 +++++++++++++++++++++++++++++++++++--- drivers/net/ethernet/sun/sunvnet.h | 9 +++- 2 files changed, 95 insertions(+), 9 deletions(-) (limited to 'drivers/net/ethernet/sun') diff --git a/drivers/net/ethernet/sun/sunvnet.c b/drivers/net/ethernet/sun/sunvnet.c index d19b3582cdf0..aac7d933319b 100644 --- a/drivers/net/ethernet/sun/sunvnet.c +++ b/drivers/net/ethernet/sun/sunvnet.c @@ -120,8 +120,15 @@ static int vnet_send_attr(struct vio_driver_state *vio) pkt.mtu = framelen + VLAN_HLEN; } - pkt.plnk_updt = PHYSLINK_UPDATE_NONE; pkt.cflags = 0; + if (vio_version_after_eq(vio, 1, 7) && port->tso) { + pkt.cflags |= VNET_LSO_IPV4_CAPAB; + if (!port->tsolen) + port->tsolen = VNET_MAXTSO; + pkt.ipv4_lso_maxlen = port->tsolen; + } + + pkt.plnk_updt = PHYSLINK_UPDATE_NONE; viodbg(HS, "SEND NET ATTR xmode[0x%x] atype[0x%x] addr[%llx] " "ackfreq[%u] plnk_updt[0x%02x] opts[0x%02x] mtu[%llu] " @@ -175,6 +182,26 @@ static int handle_attr_info(struct vio_driver_state *vio, } port->rmtu = localmtu; + /* LSO negotiation */ + if (vio_version_after_eq(vio, 1, 7)) + port->tso &= !!(pkt->cflags & VNET_LSO_IPV4_CAPAB); + else + port->tso = false; + if (port->tso) { + if (!port->tsolen) + port->tsolen = VNET_MAXTSO; + port->tsolen = min(port->tsolen, pkt->ipv4_lso_maxlen); + if (port->tsolen < VNET_MINTSO) { + port->tso = false; + port->tsolen = 0; + pkt->cflags &= ~VNET_LSO_IPV4_CAPAB; + } + pkt->ipv4_lso_maxlen = port->tsolen; + } else { + pkt->cflags &= ~VNET_LSO_IPV4_CAPAB; + pkt->ipv4_lso_maxlen = 0; + } + /* for version >= 1.6, ACK packet mode we support */ if (vio_version_after_eq(vio, 1, 6)) { pkt->xfer_mode = VIO_NEW_DRING_MODE; @@ -721,6 +748,8 @@ ldc_ctrl: if (event == LDC_EVENT_RESET) { port->rmtu = 0; + port->tso = true; + port->tsolen = 0; vio_port_up(vio); } port->rx_event = 0; @@ -1131,10 +1160,36 @@ static int vnet_handle_offloads(struct vnet_port *port, struct sk_buff *skb) struct net_device *dev = port->vp->dev; struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING]; struct sk_buff *segs; - int maclen; + int maclen, datalen; int status; + int gso_size, gso_type, gso_segs; + int hlen = skb_transport_header(skb) - skb_mac_header(skb); + int proto = IPPROTO_IP; + + if (skb->protocol == htons(ETH_P_IP)) + proto = ip_hdr(skb)->protocol; + else if (skb->protocol == htons(ETH_P_IPV6)) + proto = ipv6_hdr(skb)->nexthdr; + + if (proto == IPPROTO_TCP) + hlen += tcp_hdr(skb)->doff * 4; + else if (proto == IPPROTO_UDP) + hlen += sizeof(struct udphdr); + else { + pr_err("vnet_handle_offloads GSO with unknown transport " + "protocol %d tproto %d\n", skb->protocol, proto); + hlen = 128; /* XXX */ + } + datalen = port->tsolen - hlen; + + gso_size = skb_shinfo(skb)->gso_size; + gso_type = skb_shinfo(skb)->gso_type; + gso_segs = skb_shinfo(skb)->gso_segs; + + if (port->tso && gso_size < datalen) + gso_segs = DIV_ROUND_UP(skb->len - hlen, datalen); - if (unlikely(vnet_tx_dring_avail(dr) < skb_shinfo(skb)->gso_segs)) { + if (unlikely(vnet_tx_dring_avail(dr) < gso_segs)) { struct netdev_queue *txq; txq = netdev_get_tx_queue(dev, port->q_index); @@ -1147,7 +1202,19 @@ static int vnet_handle_offloads(struct vnet_port *port, struct sk_buff *skb) maclen = skb_network_header(skb) - skb_mac_header(skb); skb_pull(skb, maclen); - segs = skb_gso_segment(skb, dev->features & ~NETIF_F_TSO); + if (port->tso && gso_size < datalen) { + /* segment to TSO size */ + skb_shinfo(skb)->gso_size = datalen; + skb_shinfo(skb)->gso_segs = gso_segs; + + segs = skb_gso_segment(skb, dev->features & ~NETIF_F_TSO); + + /* restore gso_size & gso_segs */ + skb_shinfo(skb)->gso_size = gso_size; + skb_shinfo(skb)->gso_segs = DIV_ROUND_UP(skb->len - hlen, + gso_size); + } else + segs = skb_gso_segment(skb, dev->features & ~NETIF_F_TSO); if (IS_ERR(segs)) { dev->stats.tx_dropped++; return NETDEV_TX_OK; @@ -1162,6 +1229,13 @@ static int vnet_handle_offloads(struct vnet_port *port, struct sk_buff *skb) segs = segs->next; curr->next = NULL; + if (port->tso && curr->len > dev->mtu) { + skb_shinfo(curr)->gso_size = gso_size; + skb_shinfo(curr)->gso_type = gso_type; + skb_shinfo(curr)->gso_segs = + DIV_ROUND_UP(curr->len - hlen, gso_size); + } else + skb_shinfo(curr)->gso_size = 0; skb_push(curr, maclen); skb_reset_mac_header(curr); @@ -1203,13 +1277,13 @@ static int vnet_start_xmit(struct sk_buff *skb, struct net_device *dev) goto out_dropped; } - if (skb_is_gso(skb)) { + if (skb_is_gso(skb) && skb->len > port->tsolen) { err = vnet_handle_offloads(port, skb); rcu_read_unlock(); return err; } - if (skb->len > port->rmtu) { + if (!skb_is_gso(skb) && skb->len > port->rmtu) { unsigned long localmtu = port->rmtu - ETH_HLEN; if (vio_version_after_eq(&port->vio, 1, 3)) @@ -1306,6 +1380,11 @@ static int vnet_start_xmit(struct sk_buff *skb, struct net_device *dev) struct vio_net_dext *dext = vio_net_ext(d); memset(dext, 0, sizeof(*dext)); + if (skb_is_gso(port->tx_bufs[txi].skb)) { + dext->ipv4_lso_mss = skb_shinfo(port->tx_bufs[txi].skb) + ->gso_size; + dext->flags |= VNET_PKT_IPV4_LSO; + } if (vio_version_after_eq(&port->vio, 1, 8) && !port->switch_port) { dext->flags |= VNET_PKT_HCK_IPV4_HDRCKSUM_OK; @@ -1712,7 +1791,7 @@ static struct vnet *vnet_new(const u64 *local_mac) dev->ethtool_ops = &vnet_ethtool_ops; dev->watchdog_timeo = VNET_TX_TIMEOUT; - dev->hw_features = NETIF_F_GSO | NETIF_F_GSO_SOFTWARE | + dev->hw_features = NETIF_F_TSO | NETIF_F_GSO | NETIF_F_GSO_SOFTWARE | NETIF_F_HW_CSUM | NETIF_F_SG; dev->features = dev->hw_features; @@ -1892,6 +1971,8 @@ static int vnet_port_probe(struct vio_dev *vdev, const struct vio_device_id *id) if (mdesc_get_property(hp, vdev->mp, "switch-port", NULL) != NULL) switch_port = 1; port->switch_port = switch_port; + port->tso = true; + port->tsolen = 0; spin_lock_irqsave(&vp->lock, flags); if (switch_port) diff --git a/drivers/net/ethernet/sun/sunvnet.h b/drivers/net/ethernet/sun/sunvnet.h index cd5d343ea232..01ca78191683 100644 --- a/drivers/net/ethernet/sun/sunvnet.h +++ b/drivers/net/ethernet/sun/sunvnet.h @@ -20,6 +20,9 @@ #define VNET_TX_RING_SIZE 512 #define VNET_TX_WAKEUP_THRESH(dr) ((dr)->pending / 4) +#define VNET_MINTSO 2048 /* VIO protocol's minimum TSO len */ +#define VNET_MAXTSO 65535 /* VIO protocol's maximum TSO len */ + /* VNET packets are sent in buffers with the first 6 bytes skipped * so that after the ethernet header the IPv4/IPv6 headers are aligned * properly. @@ -40,8 +43,9 @@ struct vnet_port { struct hlist_node hash; u8 raddr[ETH_ALEN]; - u8 switch_port; - u8 __pad; + unsigned switch_port:1; + unsigned tso:1; + unsigned __pad:14; struct vnet *vp; @@ -56,6 +60,7 @@ struct vnet_port { struct timer_list clean_timer; u64 rmtu; + u16 tsolen; struct napi_struct napi; u32 napi_stop_idx; -- cgit v1.2.3