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Message-Id: <8a6871e2429d489b1577e053bfcdd6547ec24309.1458006737.git.Aaron.Young@oracle.com>
Date: Tue, 15 Mar 2016 11:35:37 -0700
From: Aaron Young <Aaron.Young@...cle.com>
To: davem@...emloft.net
Cc: netdev@...r.kernel.org, sowmini.varadhan@...cle.com,
alexandre.chartre@...cle.com, rashmi.narasimhan@...cle.com,
aaron.young@...cle.com, atish.patra@...cle.com,
Aaron Young <Aaron.Young@...cle.com>
Subject: [PATCH net-next v2 1/4] ldmvsw: Split sunvnet driver into common code
From: Aaron Young <aaron.young@...cle.com>
Split sunvnet.c into sunvnet.c and sunvnet_common.c.
Details:
Since the sunvnet and ldmvsw drivers will both use common sunvnet code,
move the functions (and support functions) anticipated to be common code
from sunvnet.c to sunvnet_common.c. Similarly, sunvnet.h was renamed to
sunvnet_common.h. The sunvnet_common.c code will be compiled into the
kernel and act as a library of functions that are linked by either
(or both) drivers when loaded.
Function names for external functions in sunvnet_common.c (to be
called by both the sunvnet and ldmvsw drivers) were tagged with a "_common"
suffix to clearly designate them as common functions.
No functional changes as of yet... just moved code verbatim to the new
sunvnet_common.c/h files.
Makefile/Kconfig support added to build sunvnet_common.c file. The code
is included in the kernel if SUN_LDOMS is defined/selected.
NOTE - per the SubmittingPatches documentation, since the code was just
moved from one file another, the code was NOT checkpatch'd in this commit
to aid in review.
Signed-off-by: Aaron Young <aaron.young@...cle.com>
Signed-off-by: Rashmi Narasimhan <rashmi.narasimhan@...cle.com>
Reviewed-by: Sowmini Varadhan <sowmini.varadhan@...cle.com>
Reviewed-by: Alexandre Chartre <Alexandre.Chartre@...cle.com>
---
drivers/net/ethernet/sun/Kconfig | 5 +
drivers/net/ethernet/sun/Makefile | 1 +
drivers/net/ethernet/sun/sunvnet.c | 1755 +----------------------------
drivers/net/ethernet/sun/sunvnet.h | 114 --
drivers/net/ethernet/sun/sunvnet_common.c | 1753 ++++++++++++++++++++++++++++
drivers/net/ethernet/sun/sunvnet_common.h | 133 +++
6 files changed, 1917 insertions(+), 1844 deletions(-)
delete mode 100644 drivers/net/ethernet/sun/sunvnet.h
create mode 100644 drivers/net/ethernet/sun/sunvnet_common.c
create mode 100644 drivers/net/ethernet/sun/sunvnet_common.h
diff --git a/drivers/net/ethernet/sun/Kconfig b/drivers/net/ethernet/sun/Kconfig
index dee94b6..aa58c11 100644
--- a/drivers/net/ethernet/sun/Kconfig
+++ b/drivers/net/ethernet/sun/Kconfig
@@ -69,6 +69,11 @@ config CASSINI
Support for the Sun Cassini chip, aka Sun GigaSwift Ethernet. See also
<http://docs.oracle.com/cd/E19113-01/giga.ether.pci/817-4341-10/817-4341-10.pdf>.
+config SUNVNET_COMMON
+ bool
+ depends on SUN_LDOMS
+ default y if SUN_LDOMS
+
config SUNVNET
tristate "Sun Virtual Network support"
depends on SUN_LDOMS
diff --git a/drivers/net/ethernet/sun/Makefile b/drivers/net/ethernet/sun/Makefile
index 1e620ff..7b622aa 100644
--- a/drivers/net/ethernet/sun/Makefile
+++ b/drivers/net/ethernet/sun/Makefile
@@ -7,5 +7,6 @@ obj-$(CONFIG_SUNQE) += sunqe.o
obj-$(CONFIG_SUNBMAC) += sunbmac.o
obj-$(CONFIG_SUNGEM) += sungem.o
obj-$(CONFIG_CASSINI) += cassini.o
+obj-$(CONFIG_SUNVNET_COMMON) += sunvnet_common.o
obj-$(CONFIG_SUNVNET) += sunvnet.o
obj-$(CONFIG_NIU) += niu.o
diff --git a/drivers/net/ethernet/sun/sunvnet.c b/drivers/net/ethernet/sun/sunvnet.c
index 942a95d..5b91135 100644
--- a/drivers/net/ethernet/sun/sunvnet.c
+++ b/drivers/net/ethernet/sun/sunvnet.c
@@ -17,8 +17,6 @@
#include <linux/mutex.h>
#include <linux/highmem.h>
#include <linux/if_vlan.h>
-#define CREATE_TRACE_POINTS
-#include <trace/events/sunvnet.h>
#if IS_ENABLED(CONFIG_IPV6)
#include <linux/icmpv6.h>
@@ -31,7 +29,12 @@
#include <asm/vio.h>
#include <asm/ldc.h>
-#include "sunvnet.h"
+#include "sunvnet_common.h"
+
+/* length of time before we decide the hardware is borked,
+ * and dev->tx_timeout() should be called to fix the problem
+ */
+#define VNET_TX_TIMEOUT (5 * HZ)
#define DRV_MODULE_NAME "sunvnet"
#define DRV_MODULE_VERSION "1.0"
@@ -44,16 +47,6 @@ MODULE_DESCRIPTION("Sun LDOM virtual network driver");
MODULE_LICENSE("GPL");
MODULE_VERSION(DRV_MODULE_VERSION);
-#define VNET_MAX_TXQS 16
-
-/* Heuristic for the number of times to exponentially backoff and
- * retry sending an LDC trigger when EAGAIN is encountered
- */
-#define VNET_MAX_RETRIES 10
-
-static int __vnet_tx_trigger(struct vnet_port *port, u32 start);
-static void vnet_port_reset(struct vnet_port *port);
-
/* Ordered from largest major to lowest */
static struct vio_version vnet_versions[] = {
{ .major = 1, .minor = 8 },
@@ -62,1578 +55,6 @@ static struct vio_version vnet_versions[] = {
{ .major = 1, .minor = 0 },
};
-static inline u32 vnet_tx_dring_avail(struct vio_dring_state *dr)
-{
- return vio_dring_avail(dr, VNET_TX_RING_SIZE);
-}
-
-static int vnet_handle_unknown(struct vnet_port *port, void *arg)
-{
- struct vio_msg_tag *pkt = arg;
-
- pr_err("Received unknown msg [%02x:%02x:%04x:%08x]\n",
- pkt->type, pkt->stype, pkt->stype_env, pkt->sid);
- pr_err("Resetting connection\n");
-
- ldc_disconnect(port->vio.lp);
-
- return -ECONNRESET;
-}
-
-static int vnet_port_alloc_tx_ring(struct vnet_port *port);
-
-static int vnet_send_attr(struct vio_driver_state *vio)
-{
- struct vnet_port *port = to_vnet_port(vio);
- struct net_device *dev = port->vp->dev;
- struct vio_net_attr_info pkt;
- int framelen = ETH_FRAME_LEN;
- int i, err;
-
- err = vnet_port_alloc_tx_ring(to_vnet_port(vio));
- if (err)
- return err;
-
- memset(&pkt, 0, sizeof(pkt));
- pkt.tag.type = VIO_TYPE_CTRL;
- pkt.tag.stype = VIO_SUBTYPE_INFO;
- pkt.tag.stype_env = VIO_ATTR_INFO;
- pkt.tag.sid = vio_send_sid(vio);
- if (vio_version_before(vio, 1, 2))
- pkt.xfer_mode = VIO_DRING_MODE;
- else
- pkt.xfer_mode = VIO_NEW_DRING_MODE;
- pkt.addr_type = VNET_ADDR_ETHERMAC;
- pkt.ack_freq = 0;
- for (i = 0; i < 6; i++)
- pkt.addr |= (u64)dev->dev_addr[i] << ((5 - i) * 8);
- if (vio_version_after(vio, 1, 3)) {
- if (port->rmtu) {
- port->rmtu = min(VNET_MAXPACKET, port->rmtu);
- pkt.mtu = port->rmtu;
- } else {
- port->rmtu = VNET_MAXPACKET;
- pkt.mtu = port->rmtu;
- }
- if (vio_version_after_eq(vio, 1, 6))
- pkt.options = VIO_TX_DRING;
- } else if (vio_version_before(vio, 1, 3)) {
- pkt.mtu = framelen;
- } else { /* v1.3 */
- pkt.mtu = framelen + VLAN_HLEN;
- }
-
- 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] "
- "cflags[0x%04x] lso_max[%u]\n",
- pkt.xfer_mode, pkt.addr_type,
- (unsigned long long)pkt.addr,
- pkt.ack_freq, pkt.plnk_updt, pkt.options,
- (unsigned long long)pkt.mtu, pkt.cflags, pkt.ipv4_lso_maxlen);
-
-
- return vio_ldc_send(vio, &pkt, sizeof(pkt));
-}
-
-static int handle_attr_info(struct vio_driver_state *vio,
- struct vio_net_attr_info *pkt)
-{
- struct vnet_port *port = to_vnet_port(vio);
- u64 localmtu;
- u8 xfer_mode;
-
- viodbg(HS, "GOT NET ATTR xmode[0x%x] atype[0x%x] addr[%llx] "
- "ackfreq[%u] plnk_updt[0x%02x] opts[0x%02x] mtu[%llu] "
- " (rmtu[%llu]) cflags[0x%04x] lso_max[%u]\n",
- pkt->xfer_mode, pkt->addr_type,
- (unsigned long long)pkt->addr,
- pkt->ack_freq, pkt->plnk_updt, pkt->options,
- (unsigned long long)pkt->mtu, port->rmtu, pkt->cflags,
- pkt->ipv4_lso_maxlen);
-
- pkt->tag.sid = vio_send_sid(vio);
-
- xfer_mode = pkt->xfer_mode;
- /* for version < 1.2, VIO_DRING_MODE = 0x3 and no bitmask */
- if (vio_version_before(vio, 1, 2) && xfer_mode == VIO_DRING_MODE)
- xfer_mode = VIO_NEW_DRING_MODE;
-
- /* MTU negotiation:
- * < v1.3 - ETH_FRAME_LEN exactly
- * > v1.3 - MIN(pkt.mtu, VNET_MAXPACKET, port->rmtu) and change
- * pkt->mtu for ACK
- * = v1.3 - ETH_FRAME_LEN + VLAN_HLEN exactly
- */
- if (vio_version_before(vio, 1, 3)) {
- localmtu = ETH_FRAME_LEN;
- } else if (vio_version_after(vio, 1, 3)) {
- localmtu = port->rmtu ? port->rmtu : VNET_MAXPACKET;
- localmtu = min(pkt->mtu, localmtu);
- pkt->mtu = localmtu;
- } else { /* v1.3 */
- localmtu = ETH_FRAME_LEN + VLAN_HLEN;
- }
- 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;
- pkt->options = VIO_TX_DRING;
- }
-
- if (!(xfer_mode | VIO_NEW_DRING_MODE) ||
- pkt->addr_type != VNET_ADDR_ETHERMAC ||
- pkt->mtu != localmtu) {
- viodbg(HS, "SEND NET ATTR NACK\n");
-
- pkt->tag.stype = VIO_SUBTYPE_NACK;
-
- (void) vio_ldc_send(vio, pkt, sizeof(*pkt));
-
- return -ECONNRESET;
- } else {
- viodbg(HS, "SEND NET ATTR ACK xmode[0x%x] atype[0x%x] "
- "addr[%llx] ackfreq[%u] plnk_updt[0x%02x] opts[0x%02x] "
- "mtu[%llu] (rmtu[%llu]) cflags[0x%04x] lso_max[%u]\n",
- pkt->xfer_mode, pkt->addr_type,
- (unsigned long long)pkt->addr,
- pkt->ack_freq, pkt->plnk_updt, pkt->options,
- (unsigned long long)pkt->mtu, port->rmtu, pkt->cflags,
- pkt->ipv4_lso_maxlen);
-
- pkt->tag.stype = VIO_SUBTYPE_ACK;
-
- return vio_ldc_send(vio, pkt, sizeof(*pkt));
- }
-
-}
-
-static int handle_attr_ack(struct vio_driver_state *vio,
- struct vio_net_attr_info *pkt)
-{
- viodbg(HS, "GOT NET ATTR ACK\n");
-
- return 0;
-}
-
-static int handle_attr_nack(struct vio_driver_state *vio,
- struct vio_net_attr_info *pkt)
-{
- viodbg(HS, "GOT NET ATTR NACK\n");
-
- return -ECONNRESET;
-}
-
-static int vnet_handle_attr(struct vio_driver_state *vio, void *arg)
-{
- struct vio_net_attr_info *pkt = arg;
-
- switch (pkt->tag.stype) {
- case VIO_SUBTYPE_INFO:
- return handle_attr_info(vio, pkt);
-
- case VIO_SUBTYPE_ACK:
- return handle_attr_ack(vio, pkt);
-
- case VIO_SUBTYPE_NACK:
- return handle_attr_nack(vio, pkt);
-
- default:
- return -ECONNRESET;
- }
-}
-
-static void vnet_handshake_complete(struct vio_driver_state *vio)
-{
- struct vio_dring_state *dr;
-
- dr = &vio->drings[VIO_DRIVER_RX_RING];
- dr->snd_nxt = dr->rcv_nxt = 1;
-
- dr = &vio->drings[VIO_DRIVER_TX_RING];
- dr->snd_nxt = dr->rcv_nxt = 1;
-}
-
-/* The hypervisor interface that implements copying to/from imported
- * memory from another domain requires that copies are done to 8-byte
- * aligned buffers, and that the lengths of such copies are also 8-byte
- * multiples.
- *
- * So we align skb->data to an 8-byte multiple and pad-out the data
- * area so we can round the copy length up to the next multiple of
- * 8 for the copy.
- *
- * The transmitter puts the actual start of the packet 6 bytes into
- * the buffer it sends over, so that the IP headers after the ethernet
- * header are aligned properly. These 6 bytes are not in the descriptor
- * length, they are simply implied. This offset is represented using
- * the VNET_PACKET_SKIP macro.
- */
-static struct sk_buff *alloc_and_align_skb(struct net_device *dev,
- unsigned int len)
-{
- struct sk_buff *skb = netdev_alloc_skb(dev, len+VNET_PACKET_SKIP+8+8);
- unsigned long addr, off;
-
- if (unlikely(!skb))
- return NULL;
-
- addr = (unsigned long) skb->data;
- off = ((addr + 7UL) & ~7UL) - addr;
- if (off)
- skb_reserve(skb, off);
-
- return skb;
-}
-
-static inline void vnet_fullcsum(struct sk_buff *skb)
-{
- struct iphdr *iph = ip_hdr(skb);
- int offset = skb_transport_offset(skb);
-
- if (skb->protocol != htons(ETH_P_IP))
- return;
- if (iph->protocol != IPPROTO_TCP &&
- iph->protocol != IPPROTO_UDP)
- return;
- skb->ip_summed = CHECKSUM_NONE;
- skb->csum_level = 1;
- skb->csum = 0;
- if (iph->protocol == IPPROTO_TCP) {
- struct tcphdr *ptcp = tcp_hdr(skb);
-
- ptcp->check = 0;
- skb->csum = skb_checksum(skb, offset, skb->len - offset, 0);
- ptcp->check = csum_tcpudp_magic(iph->saddr, iph->daddr,
- skb->len - offset, IPPROTO_TCP,
- skb->csum);
- } else if (iph->protocol == IPPROTO_UDP) {
- struct udphdr *pudp = udp_hdr(skb);
-
- pudp->check = 0;
- skb->csum = skb_checksum(skb, offset, skb->len - offset, 0);
- pudp->check = csum_tcpudp_magic(iph->saddr, iph->daddr,
- skb->len - offset, IPPROTO_UDP,
- skb->csum);
- }
-}
-
-static int vnet_rx_one(struct vnet_port *port, struct vio_net_desc *desc)
-{
- struct net_device *dev = port->vp->dev;
- unsigned int len = desc->size;
- unsigned int copy_len;
- struct sk_buff *skb;
- int maxlen;
- int err;
-
- err = -EMSGSIZE;
- if (port->tso && port->tsolen > port->rmtu)
- maxlen = port->tsolen;
- else
- maxlen = port->rmtu;
- if (unlikely(len < ETH_ZLEN || len > maxlen)) {
- dev->stats.rx_length_errors++;
- goto out_dropped;
- }
-
- skb = alloc_and_align_skb(dev, len);
- err = -ENOMEM;
- if (unlikely(!skb)) {
- dev->stats.rx_missed_errors++;
- goto out_dropped;
- }
-
- copy_len = (len + VNET_PACKET_SKIP + 7U) & ~7U;
- skb_put(skb, copy_len);
- err = ldc_copy(port->vio.lp, LDC_COPY_IN,
- skb->data, copy_len, 0,
- desc->cookies, desc->ncookies);
- if (unlikely(err < 0)) {
- dev->stats.rx_frame_errors++;
- goto out_free_skb;
- }
-
- skb_pull(skb, VNET_PACKET_SKIP);
- skb_trim(skb, len);
- skb->protocol = eth_type_trans(skb, dev);
-
- if (vio_version_after_eq(&port->vio, 1, 8)) {
- struct vio_net_dext *dext = vio_net_ext(desc);
-
- skb_reset_network_header(skb);
-
- if (dext->flags & VNET_PKT_HCK_IPV4_HDRCKSUM) {
- if (skb->protocol == ETH_P_IP) {
- struct iphdr *iph = ip_hdr(skb);
-
- iph->check = 0;
- ip_send_check(iph);
- }
- }
- if ((dext->flags & VNET_PKT_HCK_FULLCKSUM) &&
- skb->ip_summed == CHECKSUM_NONE) {
- if (skb->protocol == htons(ETH_P_IP)) {
- struct iphdr *iph = ip_hdr(skb);
- int ihl = iph->ihl * 4;
-
- skb_reset_transport_header(skb);
- skb_set_transport_header(skb, ihl);
- vnet_fullcsum(skb);
- }
- }
- if (dext->flags & VNET_PKT_HCK_IPV4_HDRCKSUM_OK) {
- skb->ip_summed = CHECKSUM_PARTIAL;
- skb->csum_level = 0;
- if (dext->flags & VNET_PKT_HCK_FULLCKSUM_OK)
- skb->csum_level = 1;
- }
- }
-
- skb->ip_summed = port->switch_port ? CHECKSUM_NONE : CHECKSUM_PARTIAL;
-
- dev->stats.rx_packets++;
- dev->stats.rx_bytes += len;
- napi_gro_receive(&port->napi, skb);
- return 0;
-
-out_free_skb:
- kfree_skb(skb);
-
-out_dropped:
- dev->stats.rx_dropped++;
- return err;
-}
-
-static int vnet_send_ack(struct vnet_port *port, struct vio_dring_state *dr,
- u32 start, u32 end, u8 vio_dring_state)
-{
- struct vio_dring_data hdr = {
- .tag = {
- .type = VIO_TYPE_DATA,
- .stype = VIO_SUBTYPE_ACK,
- .stype_env = VIO_DRING_DATA,
- .sid = vio_send_sid(&port->vio),
- },
- .dring_ident = dr->ident,
- .start_idx = start,
- .end_idx = end,
- .state = vio_dring_state,
- };
- int err, delay;
- int retries = 0;
-
- hdr.seq = dr->snd_nxt;
- delay = 1;
- do {
- err = vio_ldc_send(&port->vio, &hdr, sizeof(hdr));
- if (err > 0) {
- dr->snd_nxt++;
- break;
- }
- udelay(delay);
- if ((delay <<= 1) > 128)
- delay = 128;
- if (retries++ > VNET_MAX_RETRIES) {
- pr_info("ECONNRESET %x:%x:%x:%x:%x:%x\n",
- port->raddr[0], port->raddr[1],
- port->raddr[2], port->raddr[3],
- port->raddr[4], port->raddr[5]);
- break;
- }
- } while (err == -EAGAIN);
-
- if (err <= 0 && vio_dring_state == VIO_DRING_STOPPED) {
- port->stop_rx_idx = end;
- port->stop_rx = true;
- } else {
- port->stop_rx_idx = 0;
- port->stop_rx = false;
- }
-
- return err;
-}
-
-static struct vio_net_desc *get_rx_desc(struct vnet_port *port,
- struct vio_dring_state *dr,
- u32 index)
-{
- struct vio_net_desc *desc = port->vio.desc_buf;
- int err;
-
- err = ldc_get_dring_entry(port->vio.lp, desc, dr->entry_size,
- (index * dr->entry_size),
- dr->cookies, dr->ncookies);
- if (err < 0)
- return ERR_PTR(err);
-
- return desc;
-}
-
-static int put_rx_desc(struct vnet_port *port,
- struct vio_dring_state *dr,
- struct vio_net_desc *desc,
- u32 index)
-{
- int err;
-
- err = ldc_put_dring_entry(port->vio.lp, desc, dr->entry_size,
- (index * dr->entry_size),
- dr->cookies, dr->ncookies);
- if (err < 0)
- return err;
-
- return 0;
-}
-
-static int vnet_walk_rx_one(struct vnet_port *port,
- struct vio_dring_state *dr,
- u32 index, int *needs_ack)
-{
- struct vio_net_desc *desc = get_rx_desc(port, dr, index);
- struct vio_driver_state *vio = &port->vio;
- int err;
-
- BUG_ON(desc == NULL);
- if (IS_ERR(desc))
- return PTR_ERR(desc);
-
- if (desc->hdr.state != VIO_DESC_READY)
- return 1;
-
- dma_rmb();
-
- viodbg(DATA, "vio_walk_rx_one desc[%02x:%02x:%08x:%08x:%llx:%llx]\n",
- desc->hdr.state, desc->hdr.ack,
- desc->size, desc->ncookies,
- desc->cookies[0].cookie_addr,
- desc->cookies[0].cookie_size);
-
- err = vnet_rx_one(port, desc);
- if (err == -ECONNRESET)
- return err;
- trace_vnet_rx_one(port->vio._local_sid, port->vio._peer_sid,
- index, desc->hdr.ack);
- desc->hdr.state = VIO_DESC_DONE;
- err = put_rx_desc(port, dr, desc, index);
- if (err < 0)
- return err;
- *needs_ack = desc->hdr.ack;
- return 0;
-}
-
-static int vnet_walk_rx(struct vnet_port *port, struct vio_dring_state *dr,
- u32 start, u32 end, int *npkts, int budget)
-{
- struct vio_driver_state *vio = &port->vio;
- int ack_start = -1, ack_end = -1;
- bool send_ack = true;
-
- end = (end == (u32) -1) ? vio_dring_prev(dr, start)
- : vio_dring_next(dr, end);
-
- viodbg(DATA, "vnet_walk_rx start[%08x] end[%08x]\n", start, end);
-
- while (start != end) {
- int ack = 0, err = vnet_walk_rx_one(port, dr, start, &ack);
- if (err == -ECONNRESET)
- return err;
- if (err != 0)
- break;
- (*npkts)++;
- if (ack_start == -1)
- ack_start = start;
- ack_end = start;
- start = vio_dring_next(dr, start);
- if (ack && start != end) {
- err = vnet_send_ack(port, dr, ack_start, ack_end,
- VIO_DRING_ACTIVE);
- if (err == -ECONNRESET)
- return err;
- ack_start = -1;
- }
- if ((*npkts) >= budget) {
- send_ack = false;
- break;
- }
- }
- if (unlikely(ack_start == -1))
- ack_start = ack_end = vio_dring_prev(dr, start);
- if (send_ack) {
- port->napi_resume = false;
- trace_vnet_tx_send_stopped_ack(port->vio._local_sid,
- port->vio._peer_sid,
- ack_end, *npkts);
- return vnet_send_ack(port, dr, ack_start, ack_end,
- VIO_DRING_STOPPED);
- } else {
- trace_vnet_tx_defer_stopped_ack(port->vio._local_sid,
- port->vio._peer_sid,
- ack_end, *npkts);
- port->napi_resume = true;
- port->napi_stop_idx = ack_end;
- return 1;
- }
-}
-
-static int vnet_rx(struct vnet_port *port, void *msgbuf, int *npkts,
- int budget)
-{
- struct vio_dring_data *pkt = msgbuf;
- struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_RX_RING];
- struct vio_driver_state *vio = &port->vio;
-
- viodbg(DATA, "vnet_rx stype_env[%04x] seq[%016llx] rcv_nxt[%016llx]\n",
- pkt->tag.stype_env, pkt->seq, dr->rcv_nxt);
-
- if (unlikely(pkt->tag.stype_env != VIO_DRING_DATA))
- return 0;
- if (unlikely(pkt->seq != dr->rcv_nxt)) {
- pr_err("RX out of sequence seq[0x%llx] rcv_nxt[0x%llx]\n",
- pkt->seq, dr->rcv_nxt);
- return 0;
- }
-
- if (!port->napi_resume)
- dr->rcv_nxt++;
-
- /* XXX Validate pkt->start_idx and pkt->end_idx XXX */
-
- return vnet_walk_rx(port, dr, pkt->start_idx, pkt->end_idx,
- npkts, budget);
-}
-
-static int idx_is_pending(struct vio_dring_state *dr, u32 end)
-{
- u32 idx = dr->cons;
- int found = 0;
-
- while (idx != dr->prod) {
- if (idx == end) {
- found = 1;
- break;
- }
- idx = vio_dring_next(dr, idx);
- }
- return found;
-}
-
-static int vnet_ack(struct vnet_port *port, void *msgbuf)
-{
- struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING];
- struct vio_dring_data *pkt = msgbuf;
- struct net_device *dev;
- struct vnet *vp;
- u32 end;
- struct vio_net_desc *desc;
- struct netdev_queue *txq;
-
- if (unlikely(pkt->tag.stype_env != VIO_DRING_DATA))
- return 0;
-
- end = pkt->end_idx;
- vp = port->vp;
- dev = vp->dev;
- netif_tx_lock(dev);
- if (unlikely(!idx_is_pending(dr, end))) {
- netif_tx_unlock(dev);
- return 0;
- }
-
- /* sync for race conditions with vnet_start_xmit() and tell xmit it
- * is time to send a trigger.
- */
- trace_vnet_rx_stopped_ack(port->vio._local_sid,
- port->vio._peer_sid, end);
- dr->cons = vio_dring_next(dr, end);
- desc = vio_dring_entry(dr, dr->cons);
- if (desc->hdr.state == VIO_DESC_READY && !port->start_cons) {
- /* vnet_start_xmit() just populated this dring but missed
- * sending the "start" LDC message to the consumer.
- * Send a "start" trigger on its behalf.
- */
- if (__vnet_tx_trigger(port, dr->cons) > 0)
- port->start_cons = false;
- else
- port->start_cons = true;
- } else {
- port->start_cons = true;
- }
- netif_tx_unlock(dev);
-
- txq = netdev_get_tx_queue(dev, port->q_index);
- if (unlikely(netif_tx_queue_stopped(txq) &&
- vnet_tx_dring_avail(dr) >= VNET_TX_WAKEUP_THRESH(dr)))
- return 1;
-
- return 0;
-}
-
-static int vnet_nack(struct vnet_port *port, void *msgbuf)
-{
- /* XXX just reset or similar XXX */
- return 0;
-}
-
-static int handle_mcast(struct vnet_port *port, void *msgbuf)
-{
- struct vio_net_mcast_info *pkt = msgbuf;
-
- if (pkt->tag.stype != VIO_SUBTYPE_ACK)
- pr_err("%s: Got unexpected MCAST reply [%02x:%02x:%04x:%08x]\n",
- port->vp->dev->name,
- pkt->tag.type,
- pkt->tag.stype,
- pkt->tag.stype_env,
- pkt->tag.sid);
-
- return 0;
-}
-
-/* Got back a STOPPED LDC message on port. If the queue is stopped,
- * wake it up so that we'll send out another START message at the
- * next TX.
- */
-static void maybe_tx_wakeup(struct vnet_port *port)
-{
- struct netdev_queue *txq;
-
- txq = netdev_get_tx_queue(port->vp->dev, port->q_index);
- __netif_tx_lock(txq, smp_processor_id());
- if (likely(netif_tx_queue_stopped(txq))) {
- struct vio_dring_state *dr;
-
- dr = &port->vio.drings[VIO_DRIVER_TX_RING];
- netif_tx_wake_queue(txq);
- }
- __netif_tx_unlock(txq);
-}
-
-static inline bool port_is_up(struct vnet_port *vnet)
-{
- struct vio_driver_state *vio = &vnet->vio;
-
- return !!(vio->hs_state & VIO_HS_COMPLETE);
-}
-
-static int vnet_event_napi(struct vnet_port *port, int budget)
-{
- struct vio_driver_state *vio = &port->vio;
- int tx_wakeup, err;
- int npkts = 0;
- int event = (port->rx_event & LDC_EVENT_RESET);
-
-ldc_ctrl:
- if (unlikely(event == LDC_EVENT_RESET ||
- event == LDC_EVENT_UP)) {
- vio_link_state_change(vio, event);
-
- if (event == LDC_EVENT_RESET) {
- vnet_port_reset(port);
- vio_port_up(vio);
- }
- port->rx_event = 0;
- return 0;
- }
- /* We may have multiple LDC events in rx_event. Unroll send_events() */
- event = (port->rx_event & LDC_EVENT_UP);
- port->rx_event &= ~(LDC_EVENT_RESET|LDC_EVENT_UP);
- if (event == LDC_EVENT_UP)
- goto ldc_ctrl;
- event = port->rx_event;
- if (!(event & LDC_EVENT_DATA_READY))
- return 0;
-
- /* we dont expect any other bits than RESET, UP, DATA_READY */
- BUG_ON(event != LDC_EVENT_DATA_READY);
-
- tx_wakeup = err = 0;
- while (1) {
- union {
- struct vio_msg_tag tag;
- u64 raw[8];
- } msgbuf;
-
- if (port->napi_resume) {
- struct vio_dring_data *pkt =
- (struct vio_dring_data *)&msgbuf;
- struct vio_dring_state *dr =
- &port->vio.drings[VIO_DRIVER_RX_RING];
-
- pkt->tag.type = VIO_TYPE_DATA;
- pkt->tag.stype = VIO_SUBTYPE_INFO;
- pkt->tag.stype_env = VIO_DRING_DATA;
- pkt->seq = dr->rcv_nxt;
- pkt->start_idx = vio_dring_next(dr, port->napi_stop_idx);
- pkt->end_idx = -1;
- goto napi_resume;
- }
- err = ldc_read(vio->lp, &msgbuf, sizeof(msgbuf));
- if (unlikely(err < 0)) {
- if (err == -ECONNRESET)
- vio_conn_reset(vio);
- break;
- }
- if (err == 0)
- break;
- viodbg(DATA, "TAG [%02x:%02x:%04x:%08x]\n",
- msgbuf.tag.type,
- msgbuf.tag.stype,
- msgbuf.tag.stype_env,
- msgbuf.tag.sid);
- err = vio_validate_sid(vio, &msgbuf.tag);
- if (err < 0)
- break;
-napi_resume:
- if (likely(msgbuf.tag.type == VIO_TYPE_DATA)) {
- if (msgbuf.tag.stype == VIO_SUBTYPE_INFO) {
- if (!port_is_up(port)) {
- /* failures like handshake_failure()
- * may have cleaned up dring, but
- * NAPI polling may bring us here.
- */
- err = -ECONNRESET;
- break;
- }
- err = vnet_rx(port, &msgbuf, &npkts, budget);
- if (npkts >= budget)
- break;
- if (npkts == 0)
- break;
- } else if (msgbuf.tag.stype == VIO_SUBTYPE_ACK) {
- err = vnet_ack(port, &msgbuf);
- if (err > 0)
- tx_wakeup |= err;
- } else if (msgbuf.tag.stype == VIO_SUBTYPE_NACK) {
- err = vnet_nack(port, &msgbuf);
- }
- } else if (msgbuf.tag.type == VIO_TYPE_CTRL) {
- if (msgbuf.tag.stype_env == VNET_MCAST_INFO)
- err = handle_mcast(port, &msgbuf);
- else
- err = vio_control_pkt_engine(vio, &msgbuf);
- if (err)
- break;
- } else {
- err = vnet_handle_unknown(port, &msgbuf);
- }
- if (err == -ECONNRESET)
- break;
- }
- if (unlikely(tx_wakeup && err != -ECONNRESET))
- maybe_tx_wakeup(port);
- return npkts;
-}
-
-static int vnet_poll(struct napi_struct *napi, int budget)
-{
- struct vnet_port *port = container_of(napi, struct vnet_port, napi);
- struct vio_driver_state *vio = &port->vio;
- int processed = vnet_event_napi(port, budget);
-
- if (processed < budget) {
- napi_complete(napi);
- port->rx_event &= ~LDC_EVENT_DATA_READY;
- vio_set_intr(vio->vdev->rx_ino, HV_INTR_ENABLED);
- }
- return processed;
-}
-
-static void vnet_event(void *arg, int event)
-{
- struct vnet_port *port = arg;
- struct vio_driver_state *vio = &port->vio;
-
- port->rx_event |= event;
- vio_set_intr(vio->vdev->rx_ino, HV_INTR_DISABLED);
- napi_schedule(&port->napi);
-
-}
-
-static int __vnet_tx_trigger(struct vnet_port *port, u32 start)
-{
- struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING];
- struct vio_dring_data hdr = {
- .tag = {
- .type = VIO_TYPE_DATA,
- .stype = VIO_SUBTYPE_INFO,
- .stype_env = VIO_DRING_DATA,
- .sid = vio_send_sid(&port->vio),
- },
- .dring_ident = dr->ident,
- .start_idx = start,
- .end_idx = (u32) -1,
- };
- int err, delay;
- int retries = 0;
-
- if (port->stop_rx) {
- trace_vnet_tx_pending_stopped_ack(port->vio._local_sid,
- port->vio._peer_sid,
- port->stop_rx_idx, -1);
- err = vnet_send_ack(port,
- &port->vio.drings[VIO_DRIVER_RX_RING],
- port->stop_rx_idx, -1,
- VIO_DRING_STOPPED);
- if (err <= 0)
- return err;
- }
-
- hdr.seq = dr->snd_nxt;
- delay = 1;
- do {
- err = vio_ldc_send(&port->vio, &hdr, sizeof(hdr));
- if (err > 0) {
- dr->snd_nxt++;
- break;
- }
- udelay(delay);
- if ((delay <<= 1) > 128)
- delay = 128;
- if (retries++ > VNET_MAX_RETRIES)
- break;
- } while (err == -EAGAIN);
- trace_vnet_tx_trigger(port->vio._local_sid,
- port->vio._peer_sid, start, err);
-
- return err;
-}
-
-struct vnet_port *__tx_port_find(struct vnet *vp, struct sk_buff *skb)
-{
- unsigned int hash = vnet_hashfn(skb->data);
- struct hlist_head *hp = &vp->port_hash[hash];
- struct vnet_port *port;
-
- hlist_for_each_entry_rcu(port, hp, hash) {
- if (!port_is_up(port))
- continue;
- if (ether_addr_equal(port->raddr, skb->data))
- return port;
- }
- list_for_each_entry_rcu(port, &vp->port_list, list) {
- if (!port->switch_port)
- continue;
- if (!port_is_up(port))
- continue;
- return port;
- }
- return NULL;
-}
-
-static struct sk_buff *vnet_clean_tx_ring(struct vnet_port *port,
- unsigned *pending)
-{
- struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING];
- struct sk_buff *skb = NULL;
- int i, txi;
-
- *pending = 0;
-
- txi = dr->prod;
- for (i = 0; i < VNET_TX_RING_SIZE; ++i) {
- struct vio_net_desc *d;
-
- --txi;
- if (txi < 0)
- txi = VNET_TX_RING_SIZE-1;
-
- d = vio_dring_entry(dr, txi);
-
- if (d->hdr.state == VIO_DESC_READY) {
- (*pending)++;
- continue;
- }
- if (port->tx_bufs[txi].skb) {
- if (d->hdr.state != VIO_DESC_DONE)
- pr_notice("invalid ring buffer state %d\n",
- d->hdr.state);
- BUG_ON(port->tx_bufs[txi].skb->next);
-
- port->tx_bufs[txi].skb->next = skb;
- skb = port->tx_bufs[txi].skb;
- port->tx_bufs[txi].skb = NULL;
-
- ldc_unmap(port->vio.lp,
- port->tx_bufs[txi].cookies,
- port->tx_bufs[txi].ncookies);
- } else if (d->hdr.state == VIO_DESC_FREE)
- break;
- d->hdr.state = VIO_DESC_FREE;
- }
- return skb;
-}
-
-static inline void vnet_free_skbs(struct sk_buff *skb)
-{
- struct sk_buff *next;
-
- while (skb) {
- next = skb->next;
- skb->next = NULL;
- dev_kfree_skb(skb);
- skb = next;
- }
-}
-
-static void vnet_clean_timer_expire(unsigned long port0)
-{
- struct vnet_port *port = (struct vnet_port *)port0;
- struct sk_buff *freeskbs;
- unsigned pending;
-
- netif_tx_lock(port->vp->dev);
- freeskbs = vnet_clean_tx_ring(port, &pending);
- netif_tx_unlock(port->vp->dev);
-
- vnet_free_skbs(freeskbs);
-
- if (pending)
- (void)mod_timer(&port->clean_timer,
- jiffies + VNET_CLEAN_TIMEOUT);
- else
- del_timer(&port->clean_timer);
-}
-
-static inline int vnet_skb_map(struct ldc_channel *lp, struct sk_buff *skb,
- struct ldc_trans_cookie *cookies, int ncookies,
- unsigned int map_perm)
-{
- int i, nc, err, blen;
-
- /* header */
- blen = skb_headlen(skb);
- if (blen < ETH_ZLEN)
- blen = ETH_ZLEN;
- blen += VNET_PACKET_SKIP;
- blen += 8 - (blen & 7);
-
- err = ldc_map_single(lp, skb->data-VNET_PACKET_SKIP, blen, cookies,
- ncookies, map_perm);
- if (err < 0)
- return err;
- nc = err;
-
- for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
- skb_frag_t *f = &skb_shinfo(skb)->frags[i];
- u8 *vaddr;
-
- if (nc < ncookies) {
- vaddr = kmap_atomic(skb_frag_page(f));
- blen = skb_frag_size(f);
- blen += 8 - (blen & 7);
- err = ldc_map_single(lp, vaddr + f->page_offset,
- blen, cookies + nc, ncookies - nc,
- map_perm);
- kunmap_atomic(vaddr);
- } else {
- err = -EMSGSIZE;
- }
-
- if (err < 0) {
- ldc_unmap(lp, cookies, nc);
- return err;
- }
- nc += err;
- }
- return nc;
-}
-
-static inline struct sk_buff *vnet_skb_shape(struct sk_buff *skb, int ncookies)
-{
- struct sk_buff *nskb;
- int i, len, pad, docopy;
-
- len = skb->len;
- pad = 0;
- if (len < ETH_ZLEN) {
- pad += ETH_ZLEN - skb->len;
- len += pad;
- }
- len += VNET_PACKET_SKIP;
- pad += 8 - (len & 7);
-
- /* make sure we have enough cookies and alignment in every frag */
- docopy = skb_shinfo(skb)->nr_frags >= ncookies;
- for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
- skb_frag_t *f = &skb_shinfo(skb)->frags[i];
-
- docopy |= f->page_offset & 7;
- }
- if (((unsigned long)skb->data & 7) != VNET_PACKET_SKIP ||
- skb_tailroom(skb) < pad ||
- skb_headroom(skb) < VNET_PACKET_SKIP || docopy) {
- int start = 0, offset;
- __wsum csum;
-
- len = skb->len > ETH_ZLEN ? skb->len : ETH_ZLEN;
- nskb = alloc_and_align_skb(skb->dev, len);
- if (nskb == NULL) {
- dev_kfree_skb(skb);
- return NULL;
- }
- skb_reserve(nskb, VNET_PACKET_SKIP);
-
- nskb->protocol = skb->protocol;
- offset = skb_mac_header(skb) - skb->data;
- skb_set_mac_header(nskb, offset);
- offset = skb_network_header(skb) - skb->data;
- skb_set_network_header(nskb, offset);
- offset = skb_transport_header(skb) - skb->data;
- skb_set_transport_header(nskb, offset);
-
- offset = 0;
- nskb->csum_offset = skb->csum_offset;
- nskb->ip_summed = skb->ip_summed;
-
- if (skb->ip_summed == CHECKSUM_PARTIAL)
- start = skb_checksum_start_offset(skb);
- if (start) {
- struct iphdr *iph = ip_hdr(nskb);
- int offset = start + nskb->csum_offset;
-
- if (skb_copy_bits(skb, 0, nskb->data, start)) {
- dev_kfree_skb(nskb);
- dev_kfree_skb(skb);
- return NULL;
- }
- *(__sum16 *)(skb->data + offset) = 0;
- csum = skb_copy_and_csum_bits(skb, start,
- nskb->data + start,
- skb->len - start, 0);
- if (iph->protocol == IPPROTO_TCP ||
- iph->protocol == IPPROTO_UDP) {
- csum = csum_tcpudp_magic(iph->saddr, iph->daddr,
- skb->len - start,
- iph->protocol, csum);
- }
- *(__sum16 *)(nskb->data + offset) = csum;
-
- nskb->ip_summed = CHECKSUM_NONE;
- } else if (skb_copy_bits(skb, 0, nskb->data, skb->len)) {
- dev_kfree_skb(nskb);
- dev_kfree_skb(skb);
- return NULL;
- }
- (void)skb_put(nskb, skb->len);
- if (skb_is_gso(skb)) {
- skb_shinfo(nskb)->gso_size = skb_shinfo(skb)->gso_size;
- skb_shinfo(nskb)->gso_type = skb_shinfo(skb)->gso_type;
- }
- nskb->queue_mapping = skb->queue_mapping;
- dev_kfree_skb(skb);
- skb = nskb;
- }
- return skb;
-}
-
-static u16
-vnet_select_queue(struct net_device *dev, struct sk_buff *skb,
- void *accel_priv, select_queue_fallback_t fallback)
-{
- struct vnet *vp = netdev_priv(dev);
- struct vnet_port *port = __tx_port_find(vp, skb);
-
- if (port == NULL)
- return 0;
- return port->q_index;
-}
-
-static int vnet_start_xmit(struct sk_buff *skb, struct net_device *dev);
-
-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, 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) < gso_segs)) {
- struct netdev_queue *txq;
-
- txq = netdev_get_tx_queue(dev, port->q_index);
- netif_tx_stop_queue(txq);
- if (vnet_tx_dring_avail(dr) < skb_shinfo(skb)->gso_segs)
- return NETDEV_TX_BUSY;
- netif_tx_wake_queue(txq);
- }
-
- maclen = skb_network_header(skb) - skb_mac_header(skb);
- skb_pull(skb, maclen);
-
- if (port->tso && gso_size < datalen) {
- if (skb_unclone(skb, GFP_ATOMIC))
- goto out_dropped;
-
- /* 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);
- if (IS_ERR(segs))
- goto out_dropped;
-
- skb_push(skb, maclen);
- skb_reset_mac_header(skb);
-
- status = 0;
- while (segs) {
- struct sk_buff *curr = segs;
-
- 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);
- memcpy(skb_mac_header(curr), skb_mac_header(skb),
- maclen);
- curr->csum_start = skb_transport_header(curr) - curr->head;
- if (ip_hdr(curr)->protocol == IPPROTO_TCP)
- curr->csum_offset = offsetof(struct tcphdr, check);
- else if (ip_hdr(curr)->protocol == IPPROTO_UDP)
- curr->csum_offset = offsetof(struct udphdr, check);
-
- if (!(status & NETDEV_TX_MASK))
- status = vnet_start_xmit(curr, dev);
- if (status & NETDEV_TX_MASK)
- dev_kfree_skb_any(curr);
- }
-
- if (!(status & NETDEV_TX_MASK))
- dev_kfree_skb_any(skb);
- return status;
-out_dropped:
- dev->stats.tx_dropped++;
- dev_kfree_skb_any(skb);
- return NETDEV_TX_OK;
-}
-
-static int vnet_start_xmit(struct sk_buff *skb, struct net_device *dev)
-{
- struct vnet *vp = netdev_priv(dev);
- struct vnet_port *port = NULL;
- struct vio_dring_state *dr;
- struct vio_net_desc *d;
- unsigned int len;
- struct sk_buff *freeskbs = NULL;
- int i, err, txi;
- unsigned pending = 0;
- struct netdev_queue *txq;
-
- rcu_read_lock();
- port = __tx_port_find(vp, skb);
- if (unlikely(!port)) {
- rcu_read_unlock();
- goto out_dropped;
- }
-
- if (skb_is_gso(skb) && skb->len > port->tsolen) {
- err = vnet_handle_offloads(port, skb);
- rcu_read_unlock();
- return err;
- }
-
- 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))
- localmtu -= VLAN_HLEN;
-
- if (skb->protocol == htons(ETH_P_IP)) {
- struct flowi4 fl4;
- struct rtable *rt = NULL;
-
- memset(&fl4, 0, sizeof(fl4));
- fl4.flowi4_oif = dev->ifindex;
- fl4.flowi4_tos = RT_TOS(ip_hdr(skb)->tos);
- fl4.daddr = ip_hdr(skb)->daddr;
- fl4.saddr = ip_hdr(skb)->saddr;
-
- rt = ip_route_output_key(dev_net(dev), &fl4);
- rcu_read_unlock();
- if (!IS_ERR(rt)) {
- skb_dst_set(skb, &rt->dst);
- icmp_send(skb, ICMP_DEST_UNREACH,
- ICMP_FRAG_NEEDED,
- htonl(localmtu));
- }
- }
-#if IS_ENABLED(CONFIG_IPV6)
- else if (skb->protocol == htons(ETH_P_IPV6))
- icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, localmtu);
-#endif
- goto out_dropped;
- }
-
- skb = vnet_skb_shape(skb, 2);
-
- if (unlikely(!skb))
- goto out_dropped;
-
- if (skb->ip_summed == CHECKSUM_PARTIAL)
- vnet_fullcsum(skb);
-
- dr = &port->vio.drings[VIO_DRIVER_TX_RING];
- i = skb_get_queue_mapping(skb);
- txq = netdev_get_tx_queue(dev, i);
- if (unlikely(vnet_tx_dring_avail(dr) < 1)) {
- if (!netif_tx_queue_stopped(txq)) {
- netif_tx_stop_queue(txq);
-
- /* This is a hard error, log it. */
- netdev_err(dev, "BUG! Tx Ring full when queue awake!\n");
- dev->stats.tx_errors++;
- }
- rcu_read_unlock();
- return NETDEV_TX_BUSY;
- }
-
- d = vio_dring_cur(dr);
-
- txi = dr->prod;
-
- freeskbs = vnet_clean_tx_ring(port, &pending);
-
- BUG_ON(port->tx_bufs[txi].skb);
-
- len = skb->len;
- if (len < ETH_ZLEN)
- len = ETH_ZLEN;
-
- err = vnet_skb_map(port->vio.lp, skb, port->tx_bufs[txi].cookies, 2,
- (LDC_MAP_SHADOW | LDC_MAP_DIRECT | LDC_MAP_RW));
- if (err < 0) {
- netdev_info(dev, "tx buffer map error %d\n", err);
- goto out_dropped;
- }
-
- port->tx_bufs[txi].skb = skb;
- skb = NULL;
- port->tx_bufs[txi].ncookies = err;
-
- /* We don't rely on the ACKs to free the skb in vnet_start_xmit(),
- * thus it is safe to not set VIO_ACK_ENABLE for each transmission:
- * the protocol itself does not require it as long as the peer
- * sends a VIO_SUBTYPE_ACK for VIO_DRING_STOPPED.
- *
- * An ACK for every packet in the ring is expensive as the
- * sending of LDC messages is slow and affects performance.
- */
- d->hdr.ack = VIO_ACK_DISABLE;
- d->size = len;
- d->ncookies = port->tx_bufs[txi].ncookies;
- for (i = 0; i < d->ncookies; i++)
- d->cookies[i] = port->tx_bufs[txi].cookies[i];
- if (vio_version_after_eq(&port->vio, 1, 7)) {
- 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;
- dext->flags |= VNET_PKT_HCK_FULLCKSUM_OK;
- }
- }
-
- /* This has to be a non-SMP write barrier because we are writing
- * to memory which is shared with the peer LDOM.
- */
- dma_wmb();
-
- d->hdr.state = VIO_DESC_READY;
-
- /* Exactly one ldc "start" trigger (for dr->cons) needs to be sent
- * to notify the consumer that some descriptors are READY.
- * After that "start" trigger, no additional triggers are needed until
- * a DRING_STOPPED is received from the consumer. The dr->cons field
- * (set up by vnet_ack()) has the value of the next dring index
- * that has not yet been ack-ed. We send a "start" trigger here
- * if, and only if, start_cons is true (reset it afterward). Conversely,
- * vnet_ack() should check if the dring corresponding to cons
- * is marked READY, but start_cons was false.
- * If so, vnet_ack() should send out the missed "start" trigger.
- *
- * Note that the dma_wmb() above makes sure the cookies et al. are
- * not globally visible before the VIO_DESC_READY, and that the
- * stores are ordered correctly by the compiler. The consumer will
- * not proceed until the VIO_DESC_READY is visible assuring that
- * the consumer does not observe anything related to descriptors
- * out of order. The HV trap from the LDC start trigger is the
- * producer to consumer announcement that work is available to the
- * consumer
- */
- if (!port->start_cons) { /* previous trigger suffices */
- trace_vnet_skip_tx_trigger(port->vio._local_sid,
- port->vio._peer_sid, dr->cons);
- goto ldc_start_done;
- }
-
- err = __vnet_tx_trigger(port, dr->cons);
- if (unlikely(err < 0)) {
- netdev_info(dev, "TX trigger error %d\n", err);
- d->hdr.state = VIO_DESC_FREE;
- skb = port->tx_bufs[txi].skb;
- port->tx_bufs[txi].skb = NULL;
- dev->stats.tx_carrier_errors++;
- goto out_dropped;
- }
-
-ldc_start_done:
- port->start_cons = false;
-
- dev->stats.tx_packets++;
- dev->stats.tx_bytes += port->tx_bufs[txi].skb->len;
-
- dr->prod = (dr->prod + 1) & (VNET_TX_RING_SIZE - 1);
- if (unlikely(vnet_tx_dring_avail(dr) < 1)) {
- netif_tx_stop_queue(txq);
- if (vnet_tx_dring_avail(dr) > VNET_TX_WAKEUP_THRESH(dr))
- netif_tx_wake_queue(txq);
- }
-
- (void)mod_timer(&port->clean_timer, jiffies + VNET_CLEAN_TIMEOUT);
- rcu_read_unlock();
-
- vnet_free_skbs(freeskbs);
-
- return NETDEV_TX_OK;
-
-out_dropped:
- if (pending)
- (void)mod_timer(&port->clean_timer,
- jiffies + VNET_CLEAN_TIMEOUT);
- else if (port)
- del_timer(&port->clean_timer);
- if (port)
- rcu_read_unlock();
- if (skb)
- dev_kfree_skb(skb);
- vnet_free_skbs(freeskbs);
- dev->stats.tx_dropped++;
- return NETDEV_TX_OK;
-}
-
-static void vnet_tx_timeout(struct net_device *dev)
-{
- /* XXX Implement me XXX */
-}
-
-static int vnet_open(struct net_device *dev)
-{
- netif_carrier_on(dev);
- netif_tx_start_all_queues(dev);
-
- return 0;
-}
-
-static int vnet_close(struct net_device *dev)
-{
- netif_tx_stop_all_queues(dev);
- netif_carrier_off(dev);
-
- return 0;
-}
-
-static struct vnet_mcast_entry *__vnet_mc_find(struct vnet *vp, u8 *addr)
-{
- struct vnet_mcast_entry *m;
-
- for (m = vp->mcast_list; m; m = m->next) {
- if (ether_addr_equal(m->addr, addr))
- return m;
- }
- return NULL;
-}
-
-static void __update_mc_list(struct vnet *vp, struct net_device *dev)
-{
- struct netdev_hw_addr *ha;
-
- netdev_for_each_mc_addr(ha, dev) {
- struct vnet_mcast_entry *m;
-
- m = __vnet_mc_find(vp, ha->addr);
- if (m) {
- m->hit = 1;
- continue;
- }
-
- if (!m) {
- m = kzalloc(sizeof(*m), GFP_ATOMIC);
- if (!m)
- continue;
- memcpy(m->addr, ha->addr, ETH_ALEN);
- m->hit = 1;
-
- m->next = vp->mcast_list;
- vp->mcast_list = m;
- }
- }
-}
-
-static void __send_mc_list(struct vnet *vp, struct vnet_port *port)
-{
- struct vio_net_mcast_info info;
- struct vnet_mcast_entry *m, **pp;
- int n_addrs;
-
- memset(&info, 0, sizeof(info));
-
- info.tag.type = VIO_TYPE_CTRL;
- info.tag.stype = VIO_SUBTYPE_INFO;
- info.tag.stype_env = VNET_MCAST_INFO;
- info.tag.sid = vio_send_sid(&port->vio);
- info.set = 1;
-
- n_addrs = 0;
- for (m = vp->mcast_list; m; m = m->next) {
- if (m->sent)
- continue;
- m->sent = 1;
- memcpy(&info.mcast_addr[n_addrs * ETH_ALEN],
- m->addr, ETH_ALEN);
- if (++n_addrs == VNET_NUM_MCAST) {
- info.count = n_addrs;
-
- (void) vio_ldc_send(&port->vio, &info,
- sizeof(info));
- n_addrs = 0;
- }
- }
- if (n_addrs) {
- info.count = n_addrs;
- (void) vio_ldc_send(&port->vio, &info, sizeof(info));
- }
-
- info.set = 0;
-
- n_addrs = 0;
- pp = &vp->mcast_list;
- while ((m = *pp) != NULL) {
- if (m->hit) {
- m->hit = 0;
- pp = &m->next;
- continue;
- }
-
- memcpy(&info.mcast_addr[n_addrs * ETH_ALEN],
- m->addr, ETH_ALEN);
- if (++n_addrs == VNET_NUM_MCAST) {
- info.count = n_addrs;
- (void) vio_ldc_send(&port->vio, &info,
- sizeof(info));
- n_addrs = 0;
- }
-
- *pp = m->next;
- kfree(m);
- }
- if (n_addrs) {
- info.count = n_addrs;
- (void) vio_ldc_send(&port->vio, &info, sizeof(info));
- }
-}
-
-static void vnet_set_rx_mode(struct net_device *dev)
-{
- struct vnet *vp = netdev_priv(dev);
- struct vnet_port *port;
-
- rcu_read_lock();
- list_for_each_entry_rcu(port, &vp->port_list, list) {
-
- if (port->switch_port) {
- __update_mc_list(vp, dev);
- __send_mc_list(vp, port);
- break;
- }
- }
- rcu_read_unlock();
-}
-
-static int vnet_change_mtu(struct net_device *dev, int new_mtu)
-{
- if (new_mtu < 68 || new_mtu > 65535)
- return -EINVAL;
-
- dev->mtu = new_mtu;
- return 0;
-}
-
-static int vnet_set_mac_addr(struct net_device *dev, void *p)
-{
- return -EINVAL;
-}
-
static void vnet_get_drvinfo(struct net_device *dev,
struct ethtool_drvinfo *info)
{
@@ -1660,129 +81,21 @@ static const struct ethtool_ops vnet_ethtool_ops = {
.get_link = ethtool_op_get_link,
};
-static void vnet_port_free_tx_bufs(struct vnet_port *port)
-{
- struct vio_dring_state *dr;
- int i;
-
- dr = &port->vio.drings[VIO_DRIVER_TX_RING];
-
- if (dr->base == NULL)
- return;
-
- for (i = 0; i < VNET_TX_RING_SIZE; i++) {
- struct vio_net_desc *d;
- void *skb = port->tx_bufs[i].skb;
-
- if (!skb)
- continue;
-
- d = vio_dring_entry(dr, i);
-
- ldc_unmap(port->vio.lp,
- port->tx_bufs[i].cookies,
- port->tx_bufs[i].ncookies);
- dev_kfree_skb(skb);
- port->tx_bufs[i].skb = NULL;
- d->hdr.state = VIO_DESC_FREE;
- }
- ldc_free_exp_dring(port->vio.lp, dr->base,
- (dr->entry_size * dr->num_entries),
- dr->cookies, dr->ncookies);
- dr->base = NULL;
- dr->entry_size = 0;
- dr->num_entries = 0;
- dr->pending = 0;
- dr->ncookies = 0;
-}
-
-static void vnet_port_reset(struct vnet_port *port)
-{
- del_timer(&port->clean_timer);
- vnet_port_free_tx_bufs(port);
- port->rmtu = 0;
- port->tso = true;
- port->tsolen = 0;
-}
-
-static int vnet_port_alloc_tx_ring(struct vnet_port *port)
-{
- struct vio_dring_state *dr;
- unsigned long len, elen;
- int i, err, ncookies;
- void *dring;
-
- dr = &port->vio.drings[VIO_DRIVER_TX_RING];
-
- elen = sizeof(struct vio_net_desc) +
- sizeof(struct ldc_trans_cookie) * 2;
- if (vio_version_after_eq(&port->vio, 1, 7))
- elen += sizeof(struct vio_net_dext);
- len = VNET_TX_RING_SIZE * elen;
-
- ncookies = VIO_MAX_RING_COOKIES;
- dring = ldc_alloc_exp_dring(port->vio.lp, len,
- dr->cookies, &ncookies,
- (LDC_MAP_SHADOW |
- LDC_MAP_DIRECT |
- LDC_MAP_RW));
- if (IS_ERR(dring)) {
- err = PTR_ERR(dring);
- goto err_out;
- }
-
- dr->base = dring;
- dr->entry_size = elen;
- dr->num_entries = VNET_TX_RING_SIZE;
- dr->prod = dr->cons = 0;
- port->start_cons = true; /* need an initial trigger */
- dr->pending = VNET_TX_RING_SIZE;
- dr->ncookies = ncookies;
-
- for (i = 0; i < VNET_TX_RING_SIZE; ++i) {
- struct vio_net_desc *d;
-
- d = vio_dring_entry(dr, i);
- d->hdr.state = VIO_DESC_FREE;
- }
- return 0;
-
-err_out:
- vnet_port_free_tx_bufs(port);
-
- return err;
-}
-
-#ifdef CONFIG_NET_POLL_CONTROLLER
-static void vnet_poll_controller(struct net_device *dev)
-{
- struct vnet *vp = netdev_priv(dev);
- struct vnet_port *port;
- unsigned long flags;
-
- spin_lock_irqsave(&vp->lock, flags);
- if (!list_empty(&vp->port_list)) {
- port = list_entry(vp->port_list.next, struct vnet_port, list);
- napi_schedule(&port->napi);
- }
- spin_unlock_irqrestore(&vp->lock, flags);
-}
-#endif
static LIST_HEAD(vnet_list);
static DEFINE_MUTEX(vnet_list_mutex);
static const struct net_device_ops vnet_ops = {
- .ndo_open = vnet_open,
- .ndo_stop = vnet_close,
- .ndo_set_rx_mode = vnet_set_rx_mode,
- .ndo_set_mac_address = vnet_set_mac_addr,
+ .ndo_open = sunvnet_open_common,
+ .ndo_stop = sunvnet_close_common,
+ .ndo_set_rx_mode = sunvnet_set_rx_mode_common,
+ .ndo_set_mac_address = sunvnet_set_mac_addr_common,
.ndo_validate_addr = eth_validate_addr,
- .ndo_tx_timeout = vnet_tx_timeout,
- .ndo_change_mtu = vnet_change_mtu,
- .ndo_start_xmit = vnet_start_xmit,
- .ndo_select_queue = vnet_select_queue,
+ .ndo_tx_timeout = sunvnet_tx_timeout_common,
+ .ndo_change_mtu = sunvnet_change_mtu_common,
+ .ndo_start_xmit = sunvnet_start_xmit_common,
+ .ndo_select_queue = sunvnet_select_queue_common,
#ifdef CONFIG_NET_POLL_CONTROLLER
- .ndo_poll_controller = vnet_poll_controller,
+ .ndo_poll_controller = sunvnet_poll_controller_common,
#endif
};
@@ -1908,15 +221,15 @@ static struct vnet *vnet_find_parent(struct mdesc_handle *hp,
}
static struct ldc_channel_config vnet_ldc_cfg = {
- .event = vnet_event,
+ .event = sunvnet_event_common,
.mtu = 64,
.mode = LDC_MODE_UNRELIABLE,
};
static struct vio_driver_ops vnet_vio_ops = {
- .send_attr = vnet_send_attr,
- .handle_attr = vnet_handle_attr,
- .handshake_complete = vnet_handshake_complete,
+ .send_attr = sunvnet_send_attr_common,
+ .handle_attr = sunvnet_handle_attr_common,
+ .handshake_complete = sunvnet_handshake_complete_common,
};
static void print_version(void)
@@ -1926,25 +239,6 @@ static void print_version(void)
const char *remote_macaddr_prop = "remote-mac-address";
-static void
-vnet_port_add_txq(struct vnet_port *port)
-{
- struct vnet *vp = port->vp;
- int n;
-
- n = vp->nports++;
- n = n & (VNET_MAX_TXQS - 1);
- port->q_index = n;
- netif_tx_wake_queue(netdev_get_tx_queue(vp->dev, port->q_index));
-}
-
-static void
-vnet_port_rm_txq(struct vnet_port *port)
-{
- port->vp->nports--;
- netif_tx_stop_queue(netdev_get_tx_queue(port->vp->dev, port->q_index));
-}
-
static int vnet_port_probe(struct vio_dev *vdev, const struct vio_device_id *id)
{
struct mdesc_handle *hp;
@@ -1992,7 +286,8 @@ static int vnet_port_probe(struct vio_dev *vdev, const struct vio_device_id *id)
if (err)
goto err_out_free_port;
- netif_napi_add(port->vp->dev, &port->napi, vnet_poll, NAPI_POLL_WEIGHT);
+ netif_napi_add(port->vp->dev, &port->napi, sunvnet_poll_common,
+ NAPI_POLL_WEIGHT);
INIT_HLIST_NODE(&port->hash);
INIT_LIST_HEAD(&port->list);
@@ -2011,7 +306,7 @@ static int vnet_port_probe(struct vio_dev *vdev, const struct vio_device_id *id)
list_add_tail_rcu(&port->list, &vp->port_list);
hlist_add_head_rcu(&port->hash,
&vp->port_hash[vnet_hashfn(port->raddr)]);
- vnet_port_add_txq(port);
+ sunvnet_port_add_txq_common(port);
spin_unlock_irqrestore(&vp->lock, flags);
dev_set_drvdata(&vdev->dev, port);
@@ -2019,7 +314,7 @@ static int vnet_port_probe(struct vio_dev *vdev, const struct vio_device_id *id)
pr_info("%s: PORT ( remote-mac %pM%s )\n",
vp->dev->name, port->raddr, switch_port ? " switch-port" : "");
- setup_timer(&port->clean_timer, vnet_clean_timer_expire,
+ setup_timer(&port->clean_timer, sunvnet_clean_timer_expire_common,
(unsigned long)port);
napi_enable(&port->napi);
@@ -2052,9 +347,9 @@ static int vnet_port_remove(struct vio_dev *vdev)
synchronize_rcu();
del_timer_sync(&port->clean_timer);
- vnet_port_rm_txq(port);
+ sunvnet_port_rm_txq_common(port);
netif_napi_del(&port->napi);
- vnet_port_free_tx_bufs(port);
+ sunvnet_port_free_tx_bufs_common(port);
vio_ldc_free(&port->vio);
dev_set_drvdata(&vdev->dev, NULL);
diff --git a/drivers/net/ethernet/sun/sunvnet.h b/drivers/net/ethernet/sun/sunvnet.h
deleted file mode 100644
index 01ca781..0000000
--- a/drivers/net/ethernet/sun/sunvnet.h
+++ /dev/null
@@ -1,114 +0,0 @@
-#ifndef _SUNVNET_H
-#define _SUNVNET_H
-
-#include <linux/interrupt.h>
-
-#define DESC_NCOOKIES(entry_size) \
- ((entry_size) - sizeof(struct vio_net_desc))
-
-/* length of time before we decide the hardware is borked,
- * and dev->tx_timeout() should be called to fix the problem
- */
-#define VNET_TX_TIMEOUT (5 * HZ)
-
-/* length of time (or less) we expect pending descriptors to be marked
- * as VIO_DESC_DONE and skbs ready to be freed
- */
-#define VNET_CLEAN_TIMEOUT ((HZ/100)+1)
-
-#define VNET_MAXPACKET (65535ULL + ETH_HLEN + VLAN_HLEN)
-#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.
- */
-#define VNET_PACKET_SKIP 6
-
-#define VNET_MAXCOOKIES (VNET_MAXPACKET/PAGE_SIZE + 1)
-
-struct vnet_tx_entry {
- struct sk_buff *skb;
- unsigned int ncookies;
- struct ldc_trans_cookie cookies[VNET_MAXCOOKIES];
-};
-
-struct vnet;
-struct vnet_port {
- struct vio_driver_state vio;
-
- struct hlist_node hash;
- u8 raddr[ETH_ALEN];
- unsigned switch_port:1;
- unsigned tso:1;
- unsigned __pad:14;
-
- struct vnet *vp;
-
- struct vnet_tx_entry tx_bufs[VNET_TX_RING_SIZE];
-
- struct list_head list;
-
- u32 stop_rx_idx;
- bool stop_rx;
- bool start_cons;
-
- struct timer_list clean_timer;
-
- u64 rmtu;
- u16 tsolen;
-
- struct napi_struct napi;
- u32 napi_stop_idx;
- bool napi_resume;
- int rx_event;
- u16 q_index;
-};
-
-static inline struct vnet_port *to_vnet_port(struct vio_driver_state *vio)
-{
- return container_of(vio, struct vnet_port, vio);
-}
-
-#define VNET_PORT_HASH_SIZE 16
-#define VNET_PORT_HASH_MASK (VNET_PORT_HASH_SIZE - 1)
-
-static inline unsigned int vnet_hashfn(u8 *mac)
-{
- unsigned int val = mac[4] ^ mac[5];
-
- return val & (VNET_PORT_HASH_MASK);
-}
-
-struct vnet_mcast_entry {
- u8 addr[ETH_ALEN];
- u8 sent;
- u8 hit;
- struct vnet_mcast_entry *next;
-};
-
-struct vnet {
- /* Protects port_list and port_hash. */
- spinlock_t lock;
-
- struct net_device *dev;
-
- u32 msg_enable;
-
- struct list_head port_list;
-
- struct hlist_head port_hash[VNET_PORT_HASH_SIZE];
-
- struct vnet_mcast_entry *mcast_list;
-
- struct list_head list;
- u64 local_mac;
-
- int nports;
-};
-
-#endif /* _SUNVNET_H */
diff --git a/drivers/net/ethernet/sun/sunvnet_common.c b/drivers/net/ethernet/sun/sunvnet_common.c
new file mode 100644
index 0000000..49e85d0
--- /dev/null
+++ b/drivers/net/ethernet/sun/sunvnet_common.c
@@ -0,0 +1,1753 @@
+/* sunvnet.c: Sun LDOM Virtual Network Driver.
+ *
+ * Copyright (C) 2007, 2008 David S. Miller <davem@...emloft.net>
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/types.h>
+#include <linux/slab.h>
+#include <linux/delay.h>
+#include <linux/init.h>
+#include <linux/netdevice.h>
+#include <linux/ethtool.h>
+#include <linux/etherdevice.h>
+#include <linux/mutex.h>
+#include <linux/highmem.h>
+#include <linux/if_vlan.h>
+#define CREATE_TRACE_POINTS
+#include <trace/events/sunvnet.h>
+
+#if IS_ENABLED(CONFIG_IPV6)
+#include <linux/icmpv6.h>
+#endif
+
+#include <net/ip.h>
+#include <net/icmp.h>
+#include <net/route.h>
+
+#include <asm/vio.h>
+#include <asm/ldc.h>
+
+#include "sunvnet_common.h"
+
+/* Heuristic for the number of times to exponentially backoff and
+ * retry sending an LDC trigger when EAGAIN is encountered
+ */
+#define VNET_MAX_RETRIES 10
+
+static int __vnet_tx_trigger(struct vnet_port *port, u32 start);
+static void vnet_port_reset(struct vnet_port *port);
+
+static inline u32 vnet_tx_dring_avail(struct vio_dring_state *dr)
+{
+ return vio_dring_avail(dr, VNET_TX_RING_SIZE);
+}
+
+static int vnet_handle_unknown(struct vnet_port *port, void *arg)
+{
+ struct vio_msg_tag *pkt = arg;
+
+ pr_err("Received unknown msg [%02x:%02x:%04x:%08x]\n",
+ pkt->type, pkt->stype, pkt->stype_env, pkt->sid);
+ pr_err("Resetting connection\n");
+
+ ldc_disconnect(port->vio.lp);
+
+ return -ECONNRESET;
+}
+
+static int vnet_port_alloc_tx_ring(struct vnet_port *port);
+
+int sunvnet_send_attr_common(struct vio_driver_state *vio)
+{
+ struct vnet_port *port = to_vnet_port(vio);
+ struct net_device *dev = port->vp->dev;
+ struct vio_net_attr_info pkt;
+ int framelen = ETH_FRAME_LEN;
+ int i, err;
+
+ err = vnet_port_alloc_tx_ring(to_vnet_port(vio));
+ if (err)
+ return err;
+
+ memset(&pkt, 0, sizeof(pkt));
+ pkt.tag.type = VIO_TYPE_CTRL;
+ pkt.tag.stype = VIO_SUBTYPE_INFO;
+ pkt.tag.stype_env = VIO_ATTR_INFO;
+ pkt.tag.sid = vio_send_sid(vio);
+ if (vio_version_before(vio, 1, 2))
+ pkt.xfer_mode = VIO_DRING_MODE;
+ else
+ pkt.xfer_mode = VIO_NEW_DRING_MODE;
+ pkt.addr_type = VNET_ADDR_ETHERMAC;
+ pkt.ack_freq = 0;
+ for (i = 0; i < 6; i++)
+ pkt.addr |= (u64)dev->dev_addr[i] << ((5 - i) * 8);
+ if (vio_version_after(vio, 1, 3)) {
+ if (port->rmtu) {
+ port->rmtu = min(VNET_MAXPACKET, port->rmtu);
+ pkt.mtu = port->rmtu;
+ } else {
+ port->rmtu = VNET_MAXPACKET;
+ pkt.mtu = port->rmtu;
+ }
+ if (vio_version_after_eq(vio, 1, 6))
+ pkt.options = VIO_TX_DRING;
+ } else if (vio_version_before(vio, 1, 3)) {
+ pkt.mtu = framelen;
+ } else { /* v1.3 */
+ pkt.mtu = framelen + VLAN_HLEN;
+ }
+
+ 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] "
+ "cflags[0x%04x] lso_max[%u]\n",
+ pkt.xfer_mode, pkt.addr_type,
+ (unsigned long long)pkt.addr,
+ pkt.ack_freq, pkt.plnk_updt, pkt.options,
+ (unsigned long long)pkt.mtu, pkt.cflags, pkt.ipv4_lso_maxlen);
+
+
+ return vio_ldc_send(vio, &pkt, sizeof(pkt));
+}
+EXPORT_SYMBOL_GPL(sunvnet_send_attr_common);
+
+static int handle_attr_info(struct vio_driver_state *vio,
+ struct vio_net_attr_info *pkt)
+{
+ struct vnet_port *port = to_vnet_port(vio);
+ u64 localmtu;
+ u8 xfer_mode;
+
+ viodbg(HS, "GOT NET ATTR xmode[0x%x] atype[0x%x] addr[%llx] "
+ "ackfreq[%u] plnk_updt[0x%02x] opts[0x%02x] mtu[%llu] "
+ " (rmtu[%llu]) cflags[0x%04x] lso_max[%u]\n",
+ pkt->xfer_mode, pkt->addr_type,
+ (unsigned long long)pkt->addr,
+ pkt->ack_freq, pkt->plnk_updt, pkt->options,
+ (unsigned long long)pkt->mtu, port->rmtu, pkt->cflags,
+ pkt->ipv4_lso_maxlen);
+
+ pkt->tag.sid = vio_send_sid(vio);
+
+ xfer_mode = pkt->xfer_mode;
+ /* for version < 1.2, VIO_DRING_MODE = 0x3 and no bitmask */
+ if (vio_version_before(vio, 1, 2) && xfer_mode == VIO_DRING_MODE)
+ xfer_mode = VIO_NEW_DRING_MODE;
+
+ /* MTU negotiation:
+ * < v1.3 - ETH_FRAME_LEN exactly
+ * > v1.3 - MIN(pkt.mtu, VNET_MAXPACKET, port->rmtu) and change
+ * pkt->mtu for ACK
+ * = v1.3 - ETH_FRAME_LEN + VLAN_HLEN exactly
+ */
+ if (vio_version_before(vio, 1, 3)) {
+ localmtu = ETH_FRAME_LEN;
+ } else if (vio_version_after(vio, 1, 3)) {
+ localmtu = port->rmtu ? port->rmtu : VNET_MAXPACKET;
+ localmtu = min(pkt->mtu, localmtu);
+ pkt->mtu = localmtu;
+ } else { /* v1.3 */
+ localmtu = ETH_FRAME_LEN + VLAN_HLEN;
+ }
+ 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;
+ pkt->options = VIO_TX_DRING;
+ }
+
+ if (!(xfer_mode | VIO_NEW_DRING_MODE) ||
+ pkt->addr_type != VNET_ADDR_ETHERMAC ||
+ pkt->mtu != localmtu) {
+ viodbg(HS, "SEND NET ATTR NACK\n");
+
+ pkt->tag.stype = VIO_SUBTYPE_NACK;
+
+ (void) vio_ldc_send(vio, pkt, sizeof(*pkt));
+
+ return -ECONNRESET;
+ } else {
+ viodbg(HS, "SEND NET ATTR ACK xmode[0x%x] atype[0x%x] "
+ "addr[%llx] ackfreq[%u] plnk_updt[0x%02x] opts[0x%02x] "
+ "mtu[%llu] (rmtu[%llu]) cflags[0x%04x] lso_max[%u]\n",
+ pkt->xfer_mode, pkt->addr_type,
+ (unsigned long long)pkt->addr,
+ pkt->ack_freq, pkt->plnk_updt, pkt->options,
+ (unsigned long long)pkt->mtu, port->rmtu, pkt->cflags,
+ pkt->ipv4_lso_maxlen);
+
+ pkt->tag.stype = VIO_SUBTYPE_ACK;
+
+ return vio_ldc_send(vio, pkt, sizeof(*pkt));
+ }
+
+}
+
+static int handle_attr_ack(struct vio_driver_state *vio,
+ struct vio_net_attr_info *pkt)
+{
+ viodbg(HS, "GOT NET ATTR ACK\n");
+
+ return 0;
+}
+
+static int handle_attr_nack(struct vio_driver_state *vio,
+ struct vio_net_attr_info *pkt)
+{
+ viodbg(HS, "GOT NET ATTR NACK\n");
+
+ return -ECONNRESET;
+}
+
+int sunvnet_handle_attr_common(struct vio_driver_state *vio, void *arg)
+{
+ struct vio_net_attr_info *pkt = arg;
+
+ switch (pkt->tag.stype) {
+ case VIO_SUBTYPE_INFO:
+ return handle_attr_info(vio, pkt);
+
+ case VIO_SUBTYPE_ACK:
+ return handle_attr_ack(vio, pkt);
+
+ case VIO_SUBTYPE_NACK:
+ return handle_attr_nack(vio, pkt);
+
+ default:
+ return -ECONNRESET;
+ }
+}
+EXPORT_SYMBOL_GPL(sunvnet_handle_attr_common);
+
+void sunvnet_handshake_complete_common(struct vio_driver_state *vio)
+{
+ struct vio_dring_state *dr;
+
+ dr = &vio->drings[VIO_DRIVER_RX_RING];
+ dr->snd_nxt = dr->rcv_nxt = 1;
+
+ dr = &vio->drings[VIO_DRIVER_TX_RING];
+ dr->snd_nxt = dr->rcv_nxt = 1;
+}
+EXPORT_SYMBOL_GPL(sunvnet_handshake_complete_common);
+
+/* The hypervisor interface that implements copying to/from imported
+ * memory from another domain requires that copies are done to 8-byte
+ * aligned buffers, and that the lengths of such copies are also 8-byte
+ * multiples.
+ *
+ * So we align skb->data to an 8-byte multiple and pad-out the data
+ * area so we can round the copy length up to the next multiple of
+ * 8 for the copy.
+ *
+ * The transmitter puts the actual start of the packet 6 bytes into
+ * the buffer it sends over, so that the IP headers after the ethernet
+ * header are aligned properly. These 6 bytes are not in the descriptor
+ * length, they are simply implied. This offset is represented using
+ * the VNET_PACKET_SKIP macro.
+ */
+static struct sk_buff *alloc_and_align_skb(struct net_device *dev,
+ unsigned int len)
+{
+ struct sk_buff *skb = netdev_alloc_skb(dev, len+VNET_PACKET_SKIP+8+8);
+ unsigned long addr, off;
+
+ if (unlikely(!skb))
+ return NULL;
+
+ addr = (unsigned long) skb->data;
+ off = ((addr + 7UL) & ~7UL) - addr;
+ if (off)
+ skb_reserve(skb, off);
+
+ return skb;
+}
+
+static inline void vnet_fullcsum(struct sk_buff *skb)
+{
+ struct iphdr *iph = ip_hdr(skb);
+ int offset = skb_transport_offset(skb);
+
+ if (skb->protocol != htons(ETH_P_IP))
+ return;
+ if (iph->protocol != IPPROTO_TCP &&
+ iph->protocol != IPPROTO_UDP)
+ return;
+ skb->ip_summed = CHECKSUM_NONE;
+ skb->csum_level = 1;
+ skb->csum = 0;
+ if (iph->protocol == IPPROTO_TCP) {
+ struct tcphdr *ptcp = tcp_hdr(skb);
+
+ ptcp->check = 0;
+ skb->csum = skb_checksum(skb, offset, skb->len - offset, 0);
+ ptcp->check = csum_tcpudp_magic(iph->saddr, iph->daddr,
+ skb->len - offset, IPPROTO_TCP,
+ skb->csum);
+ } else if (iph->protocol == IPPROTO_UDP) {
+ struct udphdr *pudp = udp_hdr(skb);
+
+ pudp->check = 0;
+ skb->csum = skb_checksum(skb, offset, skb->len - offset, 0);
+ pudp->check = csum_tcpudp_magic(iph->saddr, iph->daddr,
+ skb->len - offset, IPPROTO_UDP,
+ skb->csum);
+ }
+}
+
+static int vnet_rx_one(struct vnet_port *port, struct vio_net_desc *desc)
+{
+ struct net_device *dev = port->vp->dev;
+ unsigned int len = desc->size;
+ unsigned int copy_len;
+ struct sk_buff *skb;
+ int maxlen;
+ int err;
+
+ err = -EMSGSIZE;
+ if (port->tso && port->tsolen > port->rmtu)
+ maxlen = port->tsolen;
+ else
+ maxlen = port->rmtu;
+ if (unlikely(len < ETH_ZLEN || len > maxlen)) {
+ dev->stats.rx_length_errors++;
+ goto out_dropped;
+ }
+
+ skb = alloc_and_align_skb(dev, len);
+ err = -ENOMEM;
+ if (unlikely(!skb)) {
+ dev->stats.rx_missed_errors++;
+ goto out_dropped;
+ }
+
+ copy_len = (len + VNET_PACKET_SKIP + 7U) & ~7U;
+ skb_put(skb, copy_len);
+ err = ldc_copy(port->vio.lp, LDC_COPY_IN,
+ skb->data, copy_len, 0,
+ desc->cookies, desc->ncookies);
+ if (unlikely(err < 0)) {
+ dev->stats.rx_frame_errors++;
+ goto out_free_skb;
+ }
+
+ skb_pull(skb, VNET_PACKET_SKIP);
+ skb_trim(skb, len);
+ skb->protocol = eth_type_trans(skb, dev);
+
+ if (vio_version_after_eq(&port->vio, 1, 8)) {
+ struct vio_net_dext *dext = vio_net_ext(desc);
+
+ skb_reset_network_header(skb);
+
+ if (dext->flags & VNET_PKT_HCK_IPV4_HDRCKSUM) {
+ if (skb->protocol == ETH_P_IP) {
+ struct iphdr *iph = ip_hdr(skb);
+
+ iph->check = 0;
+ ip_send_check(iph);
+ }
+ }
+ if ((dext->flags & VNET_PKT_HCK_FULLCKSUM) &&
+ skb->ip_summed == CHECKSUM_NONE) {
+ if (skb->protocol == htons(ETH_P_IP)) {
+ struct iphdr *iph = ip_hdr(skb);
+ int ihl = iph->ihl * 4;
+
+ skb_reset_transport_header(skb);
+ skb_set_transport_header(skb, ihl);
+ vnet_fullcsum(skb);
+ }
+ }
+ if (dext->flags & VNET_PKT_HCK_IPV4_HDRCKSUM_OK) {
+ skb->ip_summed = CHECKSUM_PARTIAL;
+ skb->csum_level = 0;
+ if (dext->flags & VNET_PKT_HCK_FULLCKSUM_OK)
+ skb->csum_level = 1;
+ }
+ }
+
+ skb->ip_summed = port->switch_port ? CHECKSUM_NONE : CHECKSUM_PARTIAL;
+
+ dev->stats.rx_packets++;
+ dev->stats.rx_bytes += len;
+ napi_gro_receive(&port->napi, skb);
+ return 0;
+
+out_free_skb:
+ kfree_skb(skb);
+
+out_dropped:
+ dev->stats.rx_dropped++;
+ return err;
+}
+
+static int vnet_send_ack(struct vnet_port *port, struct vio_dring_state *dr,
+ u32 start, u32 end, u8 vio_dring_state)
+{
+ struct vio_dring_data hdr = {
+ .tag = {
+ .type = VIO_TYPE_DATA,
+ .stype = VIO_SUBTYPE_ACK,
+ .stype_env = VIO_DRING_DATA,
+ .sid = vio_send_sid(&port->vio),
+ },
+ .dring_ident = dr->ident,
+ .start_idx = start,
+ .end_idx = end,
+ .state = vio_dring_state,
+ };
+ int err, delay;
+ int retries = 0;
+
+ hdr.seq = dr->snd_nxt;
+ delay = 1;
+ do {
+ err = vio_ldc_send(&port->vio, &hdr, sizeof(hdr));
+ if (err > 0) {
+ dr->snd_nxt++;
+ break;
+ }
+ udelay(delay);
+ if ((delay <<= 1) > 128)
+ delay = 128;
+ if (retries++ > VNET_MAX_RETRIES) {
+ pr_info("ECONNRESET %x:%x:%x:%x:%x:%x\n",
+ port->raddr[0], port->raddr[1],
+ port->raddr[2], port->raddr[3],
+ port->raddr[4], port->raddr[5]);
+ break;
+ }
+ } while (err == -EAGAIN);
+
+ if (err <= 0 && vio_dring_state == VIO_DRING_STOPPED) {
+ port->stop_rx_idx = end;
+ port->stop_rx = true;
+ } else {
+ port->stop_rx_idx = 0;
+ port->stop_rx = false;
+ }
+
+ return err;
+}
+
+static struct vio_net_desc *get_rx_desc(struct vnet_port *port,
+ struct vio_dring_state *dr,
+ u32 index)
+{
+ struct vio_net_desc *desc = port->vio.desc_buf;
+ int err;
+
+ err = ldc_get_dring_entry(port->vio.lp, desc, dr->entry_size,
+ (index * dr->entry_size),
+ dr->cookies, dr->ncookies);
+ if (err < 0)
+ return ERR_PTR(err);
+
+ return desc;
+}
+
+static int put_rx_desc(struct vnet_port *port,
+ struct vio_dring_state *dr,
+ struct vio_net_desc *desc,
+ u32 index)
+{
+ int err;
+
+ err = ldc_put_dring_entry(port->vio.lp, desc, dr->entry_size,
+ (index * dr->entry_size),
+ dr->cookies, dr->ncookies);
+ if (err < 0)
+ return err;
+
+ return 0;
+}
+
+static int vnet_walk_rx_one(struct vnet_port *port,
+ struct vio_dring_state *dr,
+ u32 index, int *needs_ack)
+{
+ struct vio_net_desc *desc = get_rx_desc(port, dr, index);
+ struct vio_driver_state *vio = &port->vio;
+ int err;
+
+ BUG_ON(desc == NULL);
+ if (IS_ERR(desc))
+ return PTR_ERR(desc);
+
+ if (desc->hdr.state != VIO_DESC_READY)
+ return 1;
+
+ dma_rmb();
+
+ viodbg(DATA, "vio_walk_rx_one desc[%02x:%02x:%08x:%08x:%llx:%llx]\n",
+ desc->hdr.state, desc->hdr.ack,
+ desc->size, desc->ncookies,
+ desc->cookies[0].cookie_addr,
+ desc->cookies[0].cookie_size);
+
+ err = vnet_rx_one(port, desc);
+ if (err == -ECONNRESET)
+ return err;
+ trace_vnet_rx_one(port->vio._local_sid, port->vio._peer_sid,
+ index, desc->hdr.ack);
+ desc->hdr.state = VIO_DESC_DONE;
+ err = put_rx_desc(port, dr, desc, index);
+ if (err < 0)
+ return err;
+ *needs_ack = desc->hdr.ack;
+ return 0;
+}
+
+static int vnet_walk_rx(struct vnet_port *port, struct vio_dring_state *dr,
+ u32 start, u32 end, int *npkts, int budget)
+{
+ struct vio_driver_state *vio = &port->vio;
+ int ack_start = -1, ack_end = -1;
+ bool send_ack = true;
+
+ end = (end == (u32) -1) ? vio_dring_prev(dr, start)
+ : vio_dring_next(dr, end);
+
+ viodbg(DATA, "vnet_walk_rx start[%08x] end[%08x]\n", start, end);
+
+ while (start != end) {
+ int ack = 0, err = vnet_walk_rx_one(port, dr, start, &ack);
+ if (err == -ECONNRESET)
+ return err;
+ if (err != 0)
+ break;
+ (*npkts)++;
+ if (ack_start == -1)
+ ack_start = start;
+ ack_end = start;
+ start = vio_dring_next(dr, start);
+ if (ack && start != end) {
+ err = vnet_send_ack(port, dr, ack_start, ack_end,
+ VIO_DRING_ACTIVE);
+ if (err == -ECONNRESET)
+ return err;
+ ack_start = -1;
+ }
+ if ((*npkts) >= budget) {
+ send_ack = false;
+ break;
+ }
+ }
+ if (unlikely(ack_start == -1))
+ ack_start = ack_end = vio_dring_prev(dr, start);
+ if (send_ack) {
+ port->napi_resume = false;
+ trace_vnet_tx_send_stopped_ack(port->vio._local_sid,
+ port->vio._peer_sid,
+ ack_end, *npkts);
+ return vnet_send_ack(port, dr, ack_start, ack_end,
+ VIO_DRING_STOPPED);
+ } else {
+ trace_vnet_tx_defer_stopped_ack(port->vio._local_sid,
+ port->vio._peer_sid,
+ ack_end, *npkts);
+ port->napi_resume = true;
+ port->napi_stop_idx = ack_end;
+ return 1;
+ }
+}
+
+static int vnet_rx(struct vnet_port *port, void *msgbuf, int *npkts,
+ int budget)
+{
+ struct vio_dring_data *pkt = msgbuf;
+ struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_RX_RING];
+ struct vio_driver_state *vio = &port->vio;
+
+ viodbg(DATA, "vnet_rx stype_env[%04x] seq[%016llx] rcv_nxt[%016llx]\n",
+ pkt->tag.stype_env, pkt->seq, dr->rcv_nxt);
+
+ if (unlikely(pkt->tag.stype_env != VIO_DRING_DATA))
+ return 0;
+ if (unlikely(pkt->seq != dr->rcv_nxt)) {
+ pr_err("RX out of sequence seq[0x%llx] rcv_nxt[0x%llx]\n",
+ pkt->seq, dr->rcv_nxt);
+ return 0;
+ }
+
+ if (!port->napi_resume)
+ dr->rcv_nxt++;
+
+ /* XXX Validate pkt->start_idx and pkt->end_idx XXX */
+
+ return vnet_walk_rx(port, dr, pkt->start_idx, pkt->end_idx,
+ npkts, budget);
+}
+
+static int idx_is_pending(struct vio_dring_state *dr, u32 end)
+{
+ u32 idx = dr->cons;
+ int found = 0;
+
+ while (idx != dr->prod) {
+ if (idx == end) {
+ found = 1;
+ break;
+ }
+ idx = vio_dring_next(dr, idx);
+ }
+ return found;
+}
+
+static int vnet_ack(struct vnet_port *port, void *msgbuf)
+{
+ struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING];
+ struct vio_dring_data *pkt = msgbuf;
+ struct net_device *dev;
+ struct vnet *vp;
+ u32 end;
+ struct vio_net_desc *desc;
+ struct netdev_queue *txq;
+
+ if (unlikely(pkt->tag.stype_env != VIO_DRING_DATA))
+ return 0;
+
+ end = pkt->end_idx;
+ vp = port->vp;
+ dev = vp->dev;
+ netif_tx_lock(dev);
+ if (unlikely(!idx_is_pending(dr, end))) {
+ netif_tx_unlock(dev);
+ return 0;
+ }
+
+ /* sync for race conditions with vnet_start_xmit() and tell xmit it
+ * is time to send a trigger.
+ */
+ trace_vnet_rx_stopped_ack(port->vio._local_sid,
+ port->vio._peer_sid, end);
+ dr->cons = vio_dring_next(dr, end);
+ desc = vio_dring_entry(dr, dr->cons);
+ if (desc->hdr.state == VIO_DESC_READY && !port->start_cons) {
+ /* vnet_start_xmit() just populated this dring but missed
+ * sending the "start" LDC message to the consumer.
+ * Send a "start" trigger on its behalf.
+ */
+ if (__vnet_tx_trigger(port, dr->cons) > 0)
+ port->start_cons = false;
+ else
+ port->start_cons = true;
+ } else {
+ port->start_cons = true;
+ }
+ netif_tx_unlock(dev);
+
+ txq = netdev_get_tx_queue(dev, port->q_index);
+ if (unlikely(netif_tx_queue_stopped(txq) &&
+ vnet_tx_dring_avail(dr) >= VNET_TX_WAKEUP_THRESH(dr)))
+ return 1;
+
+ return 0;
+}
+
+static int vnet_nack(struct vnet_port *port, void *msgbuf)
+{
+ /* XXX just reset or similar XXX */
+ return 0;
+}
+
+static int handle_mcast(struct vnet_port *port, void *msgbuf)
+{
+ struct vio_net_mcast_info *pkt = msgbuf;
+
+ if (pkt->tag.stype != VIO_SUBTYPE_ACK)
+ pr_err("%s: Got unexpected MCAST reply [%02x:%02x:%04x:%08x]\n",
+ port->vp->dev->name,
+ pkt->tag.type,
+ pkt->tag.stype,
+ pkt->tag.stype_env,
+ pkt->tag.sid);
+
+ return 0;
+}
+
+/* Got back a STOPPED LDC message on port. If the queue is stopped,
+ * wake it up so that we'll send out another START message at the
+ * next TX.
+ */
+static void maybe_tx_wakeup(struct vnet_port *port)
+{
+ struct netdev_queue *txq;
+
+ txq = netdev_get_tx_queue(port->vp->dev, port->q_index);
+ __netif_tx_lock(txq, smp_processor_id());
+ if (likely(netif_tx_queue_stopped(txq))) {
+ struct vio_dring_state *dr;
+
+ dr = &port->vio.drings[VIO_DRIVER_TX_RING];
+ netif_tx_wake_queue(txq);
+ }
+ __netif_tx_unlock(txq);
+}
+
+static inline bool port_is_up(struct vnet_port *vnet)
+{
+ struct vio_driver_state *vio = &vnet->vio;
+
+ return !!(vio->hs_state & VIO_HS_COMPLETE);
+}
+
+static int vnet_event_napi(struct vnet_port *port, int budget)
+{
+ struct vio_driver_state *vio = &port->vio;
+ int tx_wakeup, err;
+ int npkts = 0;
+ int event = (port->rx_event & LDC_EVENT_RESET);
+
+ldc_ctrl:
+ if (unlikely(event == LDC_EVENT_RESET ||
+ event == LDC_EVENT_UP)) {
+ vio_link_state_change(vio, event);
+
+ if (event == LDC_EVENT_RESET) {
+ vnet_port_reset(port);
+ vio_port_up(vio);
+ }
+ port->rx_event = 0;
+ return 0;
+ }
+ /* We may have multiple LDC events in rx_event. Unroll send_events() */
+ event = (port->rx_event & LDC_EVENT_UP);
+ port->rx_event &= ~(LDC_EVENT_RESET|LDC_EVENT_UP);
+ if (event == LDC_EVENT_UP)
+ goto ldc_ctrl;
+ event = port->rx_event;
+ if (!(event & LDC_EVENT_DATA_READY))
+ return 0;
+
+ /* we dont expect any other bits than RESET, UP, DATA_READY */
+ BUG_ON(event != LDC_EVENT_DATA_READY);
+
+ tx_wakeup = err = 0;
+ while (1) {
+ union {
+ struct vio_msg_tag tag;
+ u64 raw[8];
+ } msgbuf;
+
+ if (port->napi_resume) {
+ struct vio_dring_data *pkt =
+ (struct vio_dring_data *)&msgbuf;
+ struct vio_dring_state *dr =
+ &port->vio.drings[VIO_DRIVER_RX_RING];
+
+ pkt->tag.type = VIO_TYPE_DATA;
+ pkt->tag.stype = VIO_SUBTYPE_INFO;
+ pkt->tag.stype_env = VIO_DRING_DATA;
+ pkt->seq = dr->rcv_nxt;
+ pkt->start_idx = vio_dring_next(dr, port->napi_stop_idx);
+ pkt->end_idx = -1;
+ goto napi_resume;
+ }
+ err = ldc_read(vio->lp, &msgbuf, sizeof(msgbuf));
+ if (unlikely(err < 0)) {
+ if (err == -ECONNRESET)
+ vio_conn_reset(vio);
+ break;
+ }
+ if (err == 0)
+ break;
+ viodbg(DATA, "TAG [%02x:%02x:%04x:%08x]\n",
+ msgbuf.tag.type,
+ msgbuf.tag.stype,
+ msgbuf.tag.stype_env,
+ msgbuf.tag.sid);
+ err = vio_validate_sid(vio, &msgbuf.tag);
+ if (err < 0)
+ break;
+napi_resume:
+ if (likely(msgbuf.tag.type == VIO_TYPE_DATA)) {
+ if (msgbuf.tag.stype == VIO_SUBTYPE_INFO) {
+ if (!port_is_up(port)) {
+ /* failures like handshake_failure()
+ * may have cleaned up dring, but
+ * NAPI polling may bring us here.
+ */
+ err = -ECONNRESET;
+ break;
+ }
+ err = vnet_rx(port, &msgbuf, &npkts, budget);
+ if (npkts >= budget)
+ break;
+ if (npkts == 0)
+ break;
+ } else if (msgbuf.tag.stype == VIO_SUBTYPE_ACK) {
+ err = vnet_ack(port, &msgbuf);
+ if (err > 0)
+ tx_wakeup |= err;
+ } else if (msgbuf.tag.stype == VIO_SUBTYPE_NACK) {
+ err = vnet_nack(port, &msgbuf);
+ }
+ } else if (msgbuf.tag.type == VIO_TYPE_CTRL) {
+ if (msgbuf.tag.stype_env == VNET_MCAST_INFO)
+ err = handle_mcast(port, &msgbuf);
+ else
+ err = vio_control_pkt_engine(vio, &msgbuf);
+ if (err)
+ break;
+ } else {
+ err = vnet_handle_unknown(port, &msgbuf);
+ }
+ if (err == -ECONNRESET)
+ break;
+ }
+ if (unlikely(tx_wakeup && err != -ECONNRESET))
+ maybe_tx_wakeup(port);
+ return npkts;
+}
+
+int sunvnet_poll_common(struct napi_struct *napi, int budget)
+{
+ struct vnet_port *port = container_of(napi, struct vnet_port, napi);
+ struct vio_driver_state *vio = &port->vio;
+ int processed = vnet_event_napi(port, budget);
+
+ if (processed < budget) {
+ napi_complete(napi);
+ port->rx_event &= ~LDC_EVENT_DATA_READY;
+ vio_set_intr(vio->vdev->rx_ino, HV_INTR_ENABLED);
+ }
+ return processed;
+}
+EXPORT_SYMBOL_GPL(sunvnet_poll_common);
+
+void sunvnet_event_common(void *arg, int event)
+{
+ struct vnet_port *port = arg;
+ struct vio_driver_state *vio = &port->vio;
+
+ port->rx_event |= event;
+ vio_set_intr(vio->vdev->rx_ino, HV_INTR_DISABLED);
+ napi_schedule(&port->napi);
+
+}
+EXPORT_SYMBOL_GPL(sunvnet_event_common);
+
+static int __vnet_tx_trigger(struct vnet_port *port, u32 start)
+{
+ struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING];
+ struct vio_dring_data hdr = {
+ .tag = {
+ .type = VIO_TYPE_DATA,
+ .stype = VIO_SUBTYPE_INFO,
+ .stype_env = VIO_DRING_DATA,
+ .sid = vio_send_sid(&port->vio),
+ },
+ .dring_ident = dr->ident,
+ .start_idx = start,
+ .end_idx = (u32) -1,
+ };
+ int err, delay;
+ int retries = 0;
+
+ if (port->stop_rx) {
+ trace_vnet_tx_pending_stopped_ack(port->vio._local_sid,
+ port->vio._peer_sid,
+ port->stop_rx_idx, -1);
+ err = vnet_send_ack(port,
+ &port->vio.drings[VIO_DRIVER_RX_RING],
+ port->stop_rx_idx, -1,
+ VIO_DRING_STOPPED);
+ if (err <= 0)
+ return err;
+ }
+
+ hdr.seq = dr->snd_nxt;
+ delay = 1;
+ do {
+ err = vio_ldc_send(&port->vio, &hdr, sizeof(hdr));
+ if (err > 0) {
+ dr->snd_nxt++;
+ break;
+ }
+ udelay(delay);
+ if ((delay <<= 1) > 128)
+ delay = 128;
+ if (retries++ > VNET_MAX_RETRIES)
+ break;
+ } while (err == -EAGAIN);
+ trace_vnet_tx_trigger(port->vio._local_sid,
+ port->vio._peer_sid, start, err);
+
+ return err;
+}
+
+static struct vnet_port *__tx_port_find(struct vnet *vp, struct sk_buff *skb)
+{
+ unsigned int hash = vnet_hashfn(skb->data);
+ struct hlist_head *hp = &vp->port_hash[hash];
+ struct vnet_port *port;
+
+ hlist_for_each_entry_rcu(port, hp, hash) {
+ if (!port_is_up(port))
+ continue;
+ if (ether_addr_equal(port->raddr, skb->data))
+ return port;
+ }
+ list_for_each_entry_rcu(port, &vp->port_list, list) {
+ if (!port->switch_port)
+ continue;
+ if (!port_is_up(port))
+ continue;
+ return port;
+ }
+ return NULL;
+}
+
+static struct sk_buff *vnet_clean_tx_ring(struct vnet_port *port,
+ unsigned *pending)
+{
+ struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING];
+ struct sk_buff *skb = NULL;
+ int i, txi;
+
+ *pending = 0;
+
+ txi = dr->prod;
+ for (i = 0; i < VNET_TX_RING_SIZE; ++i) {
+ struct vio_net_desc *d;
+
+ --txi;
+ if (txi < 0)
+ txi = VNET_TX_RING_SIZE-1;
+
+ d = vio_dring_entry(dr, txi);
+
+ if (d->hdr.state == VIO_DESC_READY) {
+ (*pending)++;
+ continue;
+ }
+ if (port->tx_bufs[txi].skb) {
+ if (d->hdr.state != VIO_DESC_DONE)
+ pr_notice("invalid ring buffer state %d\n",
+ d->hdr.state);
+ BUG_ON(port->tx_bufs[txi].skb->next);
+
+ port->tx_bufs[txi].skb->next = skb;
+ skb = port->tx_bufs[txi].skb;
+ port->tx_bufs[txi].skb = NULL;
+
+ ldc_unmap(port->vio.lp,
+ port->tx_bufs[txi].cookies,
+ port->tx_bufs[txi].ncookies);
+ } else if (d->hdr.state == VIO_DESC_FREE)
+ break;
+ d->hdr.state = VIO_DESC_FREE;
+ }
+ return skb;
+}
+
+static inline void vnet_free_skbs(struct sk_buff *skb)
+{
+ struct sk_buff *next;
+
+ while (skb) {
+ next = skb->next;
+ skb->next = NULL;
+ dev_kfree_skb(skb);
+ skb = next;
+ }
+}
+
+void sunvnet_clean_timer_expire_common(unsigned long port0)
+{
+ struct vnet_port *port = (struct vnet_port *)port0;
+ struct sk_buff *freeskbs;
+ unsigned pending;
+
+ netif_tx_lock(port->vp->dev);
+ freeskbs = vnet_clean_tx_ring(port, &pending);
+ netif_tx_unlock(port->vp->dev);
+
+ vnet_free_skbs(freeskbs);
+
+ if (pending)
+ (void)mod_timer(&port->clean_timer,
+ jiffies + VNET_CLEAN_TIMEOUT);
+ else
+ del_timer(&port->clean_timer);
+}
+EXPORT_SYMBOL_GPL(sunvnet_clean_timer_expire_common);
+
+static inline int vnet_skb_map(struct ldc_channel *lp, struct sk_buff *skb,
+ struct ldc_trans_cookie *cookies, int ncookies,
+ unsigned int map_perm)
+{
+ int i, nc, err, blen;
+
+ /* header */
+ blen = skb_headlen(skb);
+ if (blen < ETH_ZLEN)
+ blen = ETH_ZLEN;
+ blen += VNET_PACKET_SKIP;
+ blen += 8 - (blen & 7);
+
+ err = ldc_map_single(lp, skb->data-VNET_PACKET_SKIP, blen, cookies,
+ ncookies, map_perm);
+ if (err < 0)
+ return err;
+ nc = err;
+
+ for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
+ skb_frag_t *f = &skb_shinfo(skb)->frags[i];
+ u8 *vaddr;
+
+ if (nc < ncookies) {
+ vaddr = kmap_atomic(skb_frag_page(f));
+ blen = skb_frag_size(f);
+ blen += 8 - (blen & 7);
+ err = ldc_map_single(lp, vaddr + f->page_offset,
+ blen, cookies + nc, ncookies - nc,
+ map_perm);
+ kunmap_atomic(vaddr);
+ } else {
+ err = -EMSGSIZE;
+ }
+
+ if (err < 0) {
+ ldc_unmap(lp, cookies, nc);
+ return err;
+ }
+ nc += err;
+ }
+ return nc;
+}
+
+static inline struct sk_buff *vnet_skb_shape(struct sk_buff *skb, int ncookies)
+{
+ struct sk_buff *nskb;
+ int i, len, pad, docopy;
+
+ len = skb->len;
+ pad = 0;
+ if (len < ETH_ZLEN) {
+ pad += ETH_ZLEN - skb->len;
+ len += pad;
+ }
+ len += VNET_PACKET_SKIP;
+ pad += 8 - (len & 7);
+
+ /* make sure we have enough cookies and alignment in every frag */
+ docopy = skb_shinfo(skb)->nr_frags >= ncookies;
+ for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
+ skb_frag_t *f = &skb_shinfo(skb)->frags[i];
+
+ docopy |= f->page_offset & 7;
+ }
+ if (((unsigned long)skb->data & 7) != VNET_PACKET_SKIP ||
+ skb_tailroom(skb) < pad ||
+ skb_headroom(skb) < VNET_PACKET_SKIP || docopy) {
+ int start = 0, offset;
+ __wsum csum;
+
+ len = skb->len > ETH_ZLEN ? skb->len : ETH_ZLEN;
+ nskb = alloc_and_align_skb(skb->dev, len);
+ if (nskb == NULL) {
+ dev_kfree_skb(skb);
+ return NULL;
+ }
+ skb_reserve(nskb, VNET_PACKET_SKIP);
+
+ nskb->protocol = skb->protocol;
+ offset = skb_mac_header(skb) - skb->data;
+ skb_set_mac_header(nskb, offset);
+ offset = skb_network_header(skb) - skb->data;
+ skb_set_network_header(nskb, offset);
+ offset = skb_transport_header(skb) - skb->data;
+ skb_set_transport_header(nskb, offset);
+
+ offset = 0;
+ nskb->csum_offset = skb->csum_offset;
+ nskb->ip_summed = skb->ip_summed;
+
+ if (skb->ip_summed == CHECKSUM_PARTIAL)
+ start = skb_checksum_start_offset(skb);
+ if (start) {
+ struct iphdr *iph = ip_hdr(nskb);
+ int offset = start + nskb->csum_offset;
+
+ if (skb_copy_bits(skb, 0, nskb->data, start)) {
+ dev_kfree_skb(nskb);
+ dev_kfree_skb(skb);
+ return NULL;
+ }
+ *(__sum16 *)(skb->data + offset) = 0;
+ csum = skb_copy_and_csum_bits(skb, start,
+ nskb->data + start,
+ skb->len - start, 0);
+ if (iph->protocol == IPPROTO_TCP ||
+ iph->protocol == IPPROTO_UDP) {
+ csum = csum_tcpudp_magic(iph->saddr, iph->daddr,
+ skb->len - start,
+ iph->protocol, csum);
+ }
+ *(__sum16 *)(nskb->data + offset) = csum;
+
+ nskb->ip_summed = CHECKSUM_NONE;
+ } else if (skb_copy_bits(skb, 0, nskb->data, skb->len)) {
+ dev_kfree_skb(nskb);
+ dev_kfree_skb(skb);
+ return NULL;
+ }
+ (void)skb_put(nskb, skb->len);
+ if (skb_is_gso(skb)) {
+ skb_shinfo(nskb)->gso_size = skb_shinfo(skb)->gso_size;
+ skb_shinfo(nskb)->gso_type = skb_shinfo(skb)->gso_type;
+ }
+ nskb->queue_mapping = skb->queue_mapping;
+ dev_kfree_skb(skb);
+ skb = nskb;
+ }
+ return skb;
+}
+
+u16 sunvnet_select_queue_common(struct net_device *dev, struct sk_buff *skb,
+ void *accel_priv, select_queue_fallback_t fallback)
+{
+ struct vnet *vp = netdev_priv(dev);
+ struct vnet_port *port = __tx_port_find(vp, skb);
+
+ if (port == NULL)
+ return 0;
+ return port->q_index;
+}
+EXPORT_SYMBOL_GPL(sunvnet_select_queue_common);
+
+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, 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) < gso_segs)) {
+ struct netdev_queue *txq;
+
+ txq = netdev_get_tx_queue(dev, port->q_index);
+ netif_tx_stop_queue(txq);
+ if (vnet_tx_dring_avail(dr) < skb_shinfo(skb)->gso_segs)
+ return NETDEV_TX_BUSY;
+ netif_tx_wake_queue(txq);
+ }
+
+ maclen = skb_network_header(skb) - skb_mac_header(skb);
+ skb_pull(skb, maclen);
+
+ if (port->tso && gso_size < datalen) {
+ if (skb_unclone(skb, GFP_ATOMIC))
+ goto out_dropped;
+
+ /* 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);
+ if (IS_ERR(segs))
+ goto out_dropped;
+
+ skb_push(skb, maclen);
+ skb_reset_mac_header(skb);
+
+ status = 0;
+ while (segs) {
+ struct sk_buff *curr = segs;
+
+ 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);
+ memcpy(skb_mac_header(curr), skb_mac_header(skb),
+ maclen);
+ curr->csum_start = skb_transport_header(curr) - curr->head;
+ if (ip_hdr(curr)->protocol == IPPROTO_TCP)
+ curr->csum_offset = offsetof(struct tcphdr, check);
+ else if (ip_hdr(curr)->protocol == IPPROTO_UDP)
+ curr->csum_offset = offsetof(struct udphdr, check);
+
+ if (!(status & NETDEV_TX_MASK))
+ status = sunvnet_start_xmit_common(curr, dev);
+ if (status & NETDEV_TX_MASK)
+ dev_kfree_skb_any(curr);
+ }
+
+ if (!(status & NETDEV_TX_MASK))
+ dev_kfree_skb_any(skb);
+ return status;
+out_dropped:
+ dev->stats.tx_dropped++;
+ dev_kfree_skb_any(skb);
+ return NETDEV_TX_OK;
+}
+
+int sunvnet_start_xmit_common(struct sk_buff *skb, struct net_device *dev)
+{
+ struct vnet *vp = netdev_priv(dev);
+ struct vnet_port *port = NULL;
+ struct vio_dring_state *dr;
+ struct vio_net_desc *d;
+ unsigned int len;
+ struct sk_buff *freeskbs = NULL;
+ int i, err, txi;
+ unsigned pending = 0;
+ struct netdev_queue *txq;
+
+ rcu_read_lock();
+ port = __tx_port_find(vp, skb);
+ if (unlikely(!port)) {
+ rcu_read_unlock();
+ goto out_dropped;
+ }
+
+ if (skb_is_gso(skb) && skb->len > port->tsolen) {
+ err = vnet_handle_offloads(port, skb);
+ rcu_read_unlock();
+ return err;
+ }
+
+ 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))
+ localmtu -= VLAN_HLEN;
+
+ if (skb->protocol == htons(ETH_P_IP)) {
+ struct flowi4 fl4;
+ struct rtable *rt = NULL;
+
+ memset(&fl4, 0, sizeof(fl4));
+ fl4.flowi4_oif = dev->ifindex;
+ fl4.flowi4_tos = RT_TOS(ip_hdr(skb)->tos);
+ fl4.daddr = ip_hdr(skb)->daddr;
+ fl4.saddr = ip_hdr(skb)->saddr;
+
+ rt = ip_route_output_key(dev_net(dev), &fl4);
+ rcu_read_unlock();
+ if (!IS_ERR(rt)) {
+ skb_dst_set(skb, &rt->dst);
+ icmp_send(skb, ICMP_DEST_UNREACH,
+ ICMP_FRAG_NEEDED,
+ htonl(localmtu));
+ }
+ }
+#if IS_ENABLED(CONFIG_IPV6)
+ else if (skb->protocol == htons(ETH_P_IPV6))
+ icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, localmtu);
+#endif
+ goto out_dropped;
+ }
+
+ skb = vnet_skb_shape(skb, 2);
+
+ if (unlikely(!skb))
+ goto out_dropped;
+
+ if (skb->ip_summed == CHECKSUM_PARTIAL)
+ vnet_fullcsum(skb);
+
+ dr = &port->vio.drings[VIO_DRIVER_TX_RING];
+ i = skb_get_queue_mapping(skb);
+ txq = netdev_get_tx_queue(dev, i);
+ if (unlikely(vnet_tx_dring_avail(dr) < 1)) {
+ if (!netif_tx_queue_stopped(txq)) {
+ netif_tx_stop_queue(txq);
+
+ /* This is a hard error, log it. */
+ netdev_err(dev, "BUG! Tx Ring full when queue awake!\n");
+ dev->stats.tx_errors++;
+ }
+ rcu_read_unlock();
+ return NETDEV_TX_BUSY;
+ }
+
+ d = vio_dring_cur(dr);
+
+ txi = dr->prod;
+
+ freeskbs = vnet_clean_tx_ring(port, &pending);
+
+ BUG_ON(port->tx_bufs[txi].skb);
+
+ len = skb->len;
+ if (len < ETH_ZLEN)
+ len = ETH_ZLEN;
+
+ err = vnet_skb_map(port->vio.lp, skb, port->tx_bufs[txi].cookies, 2,
+ (LDC_MAP_SHADOW | LDC_MAP_DIRECT | LDC_MAP_RW));
+ if (err < 0) {
+ netdev_info(dev, "tx buffer map error %d\n", err);
+ goto out_dropped;
+ }
+
+ port->tx_bufs[txi].skb = skb;
+ skb = NULL;
+ port->tx_bufs[txi].ncookies = err;
+
+ /* We don't rely on the ACKs to free the skb in vnet_start_xmit(),
+ * thus it is safe to not set VIO_ACK_ENABLE for each transmission:
+ * the protocol itself does not require it as long as the peer
+ * sends a VIO_SUBTYPE_ACK for VIO_DRING_STOPPED.
+ *
+ * An ACK for every packet in the ring is expensive as the
+ * sending of LDC messages is slow and affects performance.
+ */
+ d->hdr.ack = VIO_ACK_DISABLE;
+ d->size = len;
+ d->ncookies = port->tx_bufs[txi].ncookies;
+ for (i = 0; i < d->ncookies; i++)
+ d->cookies[i] = port->tx_bufs[txi].cookies[i];
+ if (vio_version_after_eq(&port->vio, 1, 7)) {
+ 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;
+ dext->flags |= VNET_PKT_HCK_FULLCKSUM_OK;
+ }
+ }
+
+ /* This has to be a non-SMP write barrier because we are writing
+ * to memory which is shared with the peer LDOM.
+ */
+ dma_wmb();
+
+ d->hdr.state = VIO_DESC_READY;
+
+ /* Exactly one ldc "start" trigger (for dr->cons) needs to be sent
+ * to notify the consumer that some descriptors are READY.
+ * After that "start" trigger, no additional triggers are needed until
+ * a DRING_STOPPED is received from the consumer. The dr->cons field
+ * (set up by vnet_ack()) has the value of the next dring index
+ * that has not yet been ack-ed. We send a "start" trigger here
+ * if, and only if, start_cons is true (reset it afterward). Conversely,
+ * vnet_ack() should check if the dring corresponding to cons
+ * is marked READY, but start_cons was false.
+ * If so, vnet_ack() should send out the missed "start" trigger.
+ *
+ * Note that the dma_wmb() above makes sure the cookies et al. are
+ * not globally visible before the VIO_DESC_READY, and that the
+ * stores are ordered correctly by the compiler. The consumer will
+ * not proceed until the VIO_DESC_READY is visible assuring that
+ * the consumer does not observe anything related to descriptors
+ * out of order. The HV trap from the LDC start trigger is the
+ * producer to consumer announcement that work is available to the
+ * consumer
+ */
+ if (!port->start_cons) { /* previous trigger suffices */
+ trace_vnet_skip_tx_trigger(port->vio._local_sid,
+ port->vio._peer_sid, dr->cons);
+ goto ldc_start_done;
+ }
+
+ err = __vnet_tx_trigger(port, dr->cons);
+ if (unlikely(err < 0)) {
+ netdev_info(dev, "TX trigger error %d\n", err);
+ d->hdr.state = VIO_DESC_FREE;
+ skb = port->tx_bufs[txi].skb;
+ port->tx_bufs[txi].skb = NULL;
+ dev->stats.tx_carrier_errors++;
+ goto out_dropped;
+ }
+
+ldc_start_done:
+ port->start_cons = false;
+
+ dev->stats.tx_packets++;
+ dev->stats.tx_bytes += port->tx_bufs[txi].skb->len;
+
+ dr->prod = (dr->prod + 1) & (VNET_TX_RING_SIZE - 1);
+ if (unlikely(vnet_tx_dring_avail(dr) < 1)) {
+ netif_tx_stop_queue(txq);
+ if (vnet_tx_dring_avail(dr) > VNET_TX_WAKEUP_THRESH(dr))
+ netif_tx_wake_queue(txq);
+ }
+
+ (void)mod_timer(&port->clean_timer, jiffies + VNET_CLEAN_TIMEOUT);
+ rcu_read_unlock();
+
+ vnet_free_skbs(freeskbs);
+
+ return NETDEV_TX_OK;
+
+out_dropped:
+ if (pending)
+ (void)mod_timer(&port->clean_timer,
+ jiffies + VNET_CLEAN_TIMEOUT);
+ else if (port)
+ del_timer(&port->clean_timer);
+ if (port)
+ rcu_read_unlock();
+ if (skb)
+ dev_kfree_skb(skb);
+ vnet_free_skbs(freeskbs);
+ dev->stats.tx_dropped++;
+ return NETDEV_TX_OK;
+}
+EXPORT_SYMBOL_GPL(sunvnet_start_xmit_common);
+
+void sunvnet_tx_timeout_common(struct net_device *dev)
+{
+ /* XXX Implement me XXX */
+}
+EXPORT_SYMBOL_GPL(sunvnet_tx_timeout_common);
+
+int sunvnet_open_common(struct net_device *dev)
+{
+ netif_carrier_on(dev);
+ netif_tx_start_all_queues(dev);
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(sunvnet_open_common);
+
+int sunvnet_close_common(struct net_device *dev)
+{
+ netif_tx_stop_all_queues(dev);
+ netif_carrier_off(dev);
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(sunvnet_close_common);
+
+static struct vnet_mcast_entry *__vnet_mc_find(struct vnet *vp, u8 *addr)
+{
+ struct vnet_mcast_entry *m;
+
+ for (m = vp->mcast_list; m; m = m->next) {
+ if (ether_addr_equal(m->addr, addr))
+ return m;
+ }
+ return NULL;
+}
+
+static void __update_mc_list(struct vnet *vp, struct net_device *dev)
+{
+ struct netdev_hw_addr *ha;
+
+ netdev_for_each_mc_addr(ha, dev) {
+ struct vnet_mcast_entry *m;
+
+ m = __vnet_mc_find(vp, ha->addr);
+ if (m) {
+ m->hit = 1;
+ continue;
+ }
+
+ if (!m) {
+ m = kzalloc(sizeof(*m), GFP_ATOMIC);
+ if (!m)
+ continue;
+ memcpy(m->addr, ha->addr, ETH_ALEN);
+ m->hit = 1;
+
+ m->next = vp->mcast_list;
+ vp->mcast_list = m;
+ }
+ }
+}
+
+static void __send_mc_list(struct vnet *vp, struct vnet_port *port)
+{
+ struct vio_net_mcast_info info;
+ struct vnet_mcast_entry *m, **pp;
+ int n_addrs;
+
+ memset(&info, 0, sizeof(info));
+
+ info.tag.type = VIO_TYPE_CTRL;
+ info.tag.stype = VIO_SUBTYPE_INFO;
+ info.tag.stype_env = VNET_MCAST_INFO;
+ info.tag.sid = vio_send_sid(&port->vio);
+ info.set = 1;
+
+ n_addrs = 0;
+ for (m = vp->mcast_list; m; m = m->next) {
+ if (m->sent)
+ continue;
+ m->sent = 1;
+ memcpy(&info.mcast_addr[n_addrs * ETH_ALEN],
+ m->addr, ETH_ALEN);
+ if (++n_addrs == VNET_NUM_MCAST) {
+ info.count = n_addrs;
+
+ (void) vio_ldc_send(&port->vio, &info,
+ sizeof(info));
+ n_addrs = 0;
+ }
+ }
+ if (n_addrs) {
+ info.count = n_addrs;
+ (void) vio_ldc_send(&port->vio, &info, sizeof(info));
+ }
+
+ info.set = 0;
+
+ n_addrs = 0;
+ pp = &vp->mcast_list;
+ while ((m = *pp) != NULL) {
+ if (m->hit) {
+ m->hit = 0;
+ pp = &m->next;
+ continue;
+ }
+
+ memcpy(&info.mcast_addr[n_addrs * ETH_ALEN],
+ m->addr, ETH_ALEN);
+ if (++n_addrs == VNET_NUM_MCAST) {
+ info.count = n_addrs;
+ (void) vio_ldc_send(&port->vio, &info,
+ sizeof(info));
+ n_addrs = 0;
+ }
+
+ *pp = m->next;
+ kfree(m);
+ }
+ if (n_addrs) {
+ info.count = n_addrs;
+ (void) vio_ldc_send(&port->vio, &info, sizeof(info));
+ }
+}
+
+void sunvnet_set_rx_mode_common(struct net_device *dev)
+{
+ struct vnet *vp = netdev_priv(dev);
+ struct vnet_port *port;
+
+ rcu_read_lock();
+ list_for_each_entry_rcu(port, &vp->port_list, list) {
+
+ if (port->switch_port) {
+ __update_mc_list(vp, dev);
+ __send_mc_list(vp, port);
+ break;
+ }
+ }
+ rcu_read_unlock();
+}
+EXPORT_SYMBOL_GPL(sunvnet_set_rx_mode_common);
+
+int sunvnet_change_mtu_common(struct net_device *dev, int new_mtu)
+{
+ if (new_mtu < 68 || new_mtu > 65535)
+ return -EINVAL;
+
+ dev->mtu = new_mtu;
+ return 0;
+}
+EXPORT_SYMBOL_GPL(sunvnet_change_mtu_common);
+
+int sunvnet_set_mac_addr_common(struct net_device *dev, void *p)
+{
+ return -EINVAL;
+}
+EXPORT_SYMBOL_GPL(sunvnet_set_mac_addr_common);
+
+void sunvnet_port_free_tx_bufs_common(struct vnet_port *port)
+{
+ struct vio_dring_state *dr;
+ int i;
+
+ dr = &port->vio.drings[VIO_DRIVER_TX_RING];
+
+ if (dr->base == NULL)
+ return;
+
+ for (i = 0; i < VNET_TX_RING_SIZE; i++) {
+ struct vio_net_desc *d;
+ void *skb = port->tx_bufs[i].skb;
+
+ if (!skb)
+ continue;
+
+ d = vio_dring_entry(dr, i);
+
+ ldc_unmap(port->vio.lp,
+ port->tx_bufs[i].cookies,
+ port->tx_bufs[i].ncookies);
+ dev_kfree_skb(skb);
+ port->tx_bufs[i].skb = NULL;
+ d->hdr.state = VIO_DESC_FREE;
+ }
+ ldc_free_exp_dring(port->vio.lp, dr->base,
+ (dr->entry_size * dr->num_entries),
+ dr->cookies, dr->ncookies);
+ dr->base = NULL;
+ dr->entry_size = 0;
+ dr->num_entries = 0;
+ dr->pending = 0;
+ dr->ncookies = 0;
+}
+EXPORT_SYMBOL_GPL(sunvnet_port_free_tx_bufs_common);
+
+static void vnet_port_reset(struct vnet_port *port)
+{
+ del_timer(&port->clean_timer);
+ sunvnet_port_free_tx_bufs_common(port);
+ port->rmtu = 0;
+ port->tso = true;
+ port->tsolen = 0;
+}
+
+static int vnet_port_alloc_tx_ring(struct vnet_port *port)
+{
+ struct vio_dring_state *dr;
+ unsigned long len, elen;
+ int i, err, ncookies;
+ void *dring;
+
+ dr = &port->vio.drings[VIO_DRIVER_TX_RING];
+
+ elen = sizeof(struct vio_net_desc) +
+ sizeof(struct ldc_trans_cookie) * 2;
+ if (vio_version_after_eq(&port->vio, 1, 7))
+ elen += sizeof(struct vio_net_dext);
+ len = VNET_TX_RING_SIZE * elen;
+
+ ncookies = VIO_MAX_RING_COOKIES;
+ dring = ldc_alloc_exp_dring(port->vio.lp, len,
+ dr->cookies, &ncookies,
+ (LDC_MAP_SHADOW |
+ LDC_MAP_DIRECT |
+ LDC_MAP_RW));
+ if (IS_ERR(dring)) {
+ err = PTR_ERR(dring);
+ goto err_out;
+ }
+
+ dr->base = dring;
+ dr->entry_size = elen;
+ dr->num_entries = VNET_TX_RING_SIZE;
+ dr->prod = dr->cons = 0;
+ port->start_cons = true; /* need an initial trigger */
+ dr->pending = VNET_TX_RING_SIZE;
+ dr->ncookies = ncookies;
+
+ for (i = 0; i < VNET_TX_RING_SIZE; ++i) {
+ struct vio_net_desc *d;
+
+ d = vio_dring_entry(dr, i);
+ d->hdr.state = VIO_DESC_FREE;
+ }
+ return 0;
+
+err_out:
+ sunvnet_port_free_tx_bufs_common(port);
+
+ return err;
+}
+
+#ifdef CONFIG_NET_POLL_CONTROLLER
+void sunvnet_poll_controller_common(struct net_device *dev)
+{
+ struct vnet *vp = netdev_priv(dev);
+ struct vnet_port *port;
+ unsigned long flags;
+
+ spin_lock_irqsave(&vp->lock, flags);
+ if (!list_empty(&vp->port_list)) {
+ port = list_entry(vp->port_list.next, struct vnet_port, list);
+ napi_schedule(&port->napi);
+ }
+ spin_unlock_irqrestore(&vp->lock, flags);
+}
+EXPORT_SYMBOL_GPL(sunvnet_poll_controller_common);
+#endif
+
+void sunvnet_port_add_txq_common(struct vnet_port *port)
+{
+ struct vnet *vp = port->vp;
+ int n;
+
+ n = vp->nports++;
+ n = n & (VNET_MAX_TXQS - 1);
+ port->q_index = n;
+ netif_tx_wake_queue(netdev_get_tx_queue(vp->dev, port->q_index));
+}
+EXPORT_SYMBOL_GPL(sunvnet_port_add_txq_common);
+
+void sunvnet_port_rm_txq_common(struct vnet_port *port)
+{
+ port->vp->nports--;
+ netif_tx_stop_queue(netdev_get_tx_queue(port->vp->dev, port->q_index));
+}
+EXPORT_SYMBOL_GPL(sunvnet_port_rm_txq_common);
diff --git a/drivers/net/ethernet/sun/sunvnet_common.h b/drivers/net/ethernet/sun/sunvnet_common.h
new file mode 100644
index 0000000..c29c526
--- /dev/null
+++ b/drivers/net/ethernet/sun/sunvnet_common.h
@@ -0,0 +1,133 @@
+#ifndef _SUNVNETCOMMON_H
+#define _SUNVNETCOMMON_H
+
+#include <linux/interrupt.h>
+
+/* length of time (or less) we expect pending descriptors to be marked
+ * as VIO_DESC_DONE and skbs ready to be freed
+ */
+#define VNET_CLEAN_TIMEOUT ((HZ / 100) + 1)
+
+#define VNET_MAXPACKET (65535ULL + ETH_HLEN + VLAN_HLEN)
+#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.
+ */
+#define VNET_PACKET_SKIP 6
+
+#define VNET_MAXCOOKIES (VNET_MAXPACKET / PAGE_SIZE + 1)
+
+#define VNET_MAX_TXQS 16
+
+struct vnet_tx_entry {
+ struct sk_buff *skb;
+ unsigned int ncookies;
+ struct ldc_trans_cookie cookies[VNET_MAXCOOKIES];
+};
+
+struct vnet;
+struct vnet_port {
+ struct vio_driver_state vio;
+
+ struct hlist_node hash;
+ u8 raddr[ETH_ALEN];
+ unsigned switch_port:1;
+ unsigned tso:1;
+ unsigned __pad:14;
+
+ struct vnet *vp;
+
+ struct vnet_tx_entry tx_bufs[VNET_TX_RING_SIZE];
+
+ struct list_head list;
+
+ u32 stop_rx_idx;
+ bool stop_rx;
+ bool start_cons;
+
+ struct timer_list clean_timer;
+
+ u64 rmtu;
+ u16 tsolen;
+
+ struct napi_struct napi;
+ u32 napi_stop_idx;
+ bool napi_resume;
+ int rx_event;
+ u16 q_index;
+};
+
+static inline struct vnet_port *to_vnet_port(struct vio_driver_state *vio)
+{
+ return container_of(vio, struct vnet_port, vio);
+}
+
+#define VNET_PORT_HASH_SIZE 16
+#define VNET_PORT_HASH_MASK (VNET_PORT_HASH_SIZE - 1)
+
+static inline unsigned int vnet_hashfn(u8 *mac)
+{
+ unsigned int val = mac[4] ^ mac[5];
+
+ return val & (VNET_PORT_HASH_MASK);
+}
+
+struct vnet_mcast_entry {
+ u8 addr[ETH_ALEN];
+ u8 sent;
+ u8 hit;
+ struct vnet_mcast_entry *next;
+};
+
+struct vnet {
+ /* Protects port_list and port_hash. */
+ spinlock_t lock;
+
+ struct net_device *dev;
+
+ u32 msg_enable;
+
+ struct list_head port_list;
+
+ struct hlist_head port_hash[VNET_PORT_HASH_SIZE];
+
+ struct vnet_mcast_entry *mcast_list;
+
+ struct list_head list;
+ u64 local_mac;
+
+ int nports;
+};
+
+/* Common funcs */
+void sunvnet_clean_timer_expire_common(unsigned long port0);
+int sunvnet_open_common(struct net_device *dev);
+int sunvnet_close_common(struct net_device *dev);
+void sunvnet_set_rx_mode_common(struct net_device *dev);
+int sunvnet_set_mac_addr_common(struct net_device *dev, void *p);
+void sunvnet_tx_timeout_common(struct net_device *dev);
+int sunvnet_change_mtu_common(struct net_device *dev, int new_mtu);
+int sunvnet_start_xmit_common(struct sk_buff *skb, struct net_device *dev);
+u16 sunvnet_select_queue_common(struct net_device *dev,
+ struct sk_buff *skb,
+ void *accel_priv,
+ select_queue_fallback_t fallback);
+#ifdef CONFIG_NET_POLL_CONTROLLER
+void sunvnet_poll_controller_common(struct net_device *dev);
+#endif
+void sunvnet_event_common(void *arg, int event);
+int sunvnet_send_attr_common(struct vio_driver_state *vio);
+int sunvnet_handle_attr_common(struct vio_driver_state *vio, void *arg);
+void sunvnet_handshake_complete_common(struct vio_driver_state *vio);
+int sunvnet_poll_common(struct napi_struct *napi, int budget);
+void sunvnet_port_free_tx_bufs_common(struct vnet_port *port);
+void sunvnet_port_add_txq_common(struct vnet_port *port);
+void sunvnet_port_rm_txq_common(struct vnet_port *port);
+
+#endif /* _SUNVNETCOMMON_H */
--
1.7.1
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