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Date: Tue, 02 Dec 2014 15:31:38 -0500
From: David L Stevens <david.stevens@...cle.com>
To: David Miller <davem@...emloft.net>
CC: netdev@...r.kernel.org,
Sowmini Varadhan <sowmini.varadhan@...cle.com>
Subject: [PATCH net-next 6/6] sunvnet: add TSO support
This patch adds TSO support for the sunvnet driver.
Signed-off-by: David L Stevens <david.stevens@...cle.com>
---
drivers/net/ethernet/sun/sunvnet.c | 95 +++++++++++++++++++++++++++++++++---
drivers/net/ethernet/sun/sunvnet.h | 9 +++-
2 files changed, 95 insertions(+), 9 deletions(-)
diff --git a/drivers/net/ethernet/sun/sunvnet.c b/drivers/net/ethernet/sun/sunvnet.c
index d19b358..b883add 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 cd5d343..01ca781 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;
--
1.7.1
--
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