diff options
Diffstat (limited to 'drivers/net/ethernet/sun/sunvnet.c')
| -rw-r--r-- | drivers/net/ethernet/sun/sunvnet.c | 775 |
1 files changed, 592 insertions, 183 deletions
diff --git a/drivers/net/ethernet/sun/sunvnet.c b/drivers/net/ethernet/sun/sunvnet.c index 3652afd3ec78..45c408ef67d0 100644 --- a/drivers/net/ethernet/sun/sunvnet.c +++ b/drivers/net/ethernet/sun/sunvnet.c @@ -15,12 +15,14 @@ #include <linux/ethtool.h> #include <linux/etherdevice.h> #include <linux/mutex.h> +#include <linux/highmem.h> #include <linux/if_vlan.h> #if IS_ENABLED(CONFIG_IPV6) #include <linux/icmpv6.h> #endif +#include <net/ip.h> #include <net/icmp.h> #include <net/route.h> @@ -40,6 +42,8 @@ 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 */ @@ -49,6 +53,8 @@ static int __vnet_tx_trigger(struct vnet_port *port, u32 start); /* Ordered from largest major to lowest */ static struct vio_version vnet_versions[] = { + { .major = 1, .minor = 8 }, + { .major = 1, .minor = 7 }, { .major = 1, .minor = 6 }, { .major = 1, .minor = 0 }, }; @@ -71,13 +77,19 @@ static int vnet_handle_unknown(struct vnet_port *port, void *arg) 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; + 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; @@ -108,8 +120,15 @@ static int vnet_send_attr(struct vio_driver_state *vio) pkt.mtu = framelen + VLAN_HLEN; } - pkt.plnk_updt = PHYSLINK_UPDATE_NONE; pkt.cflags = 0; + if (vio_version_after_eq(vio, 1, 7) && port->tso) { + pkt.cflags |= VNET_LSO_IPV4_CAPAB; + if (!port->tsolen) + port->tsolen = VNET_MAXTSO; + pkt.ipv4_lso_maxlen = port->tsolen; + } + + pkt.plnk_updt = PHYSLINK_UPDATE_NONE; viodbg(HS, "SEND NET ATTR xmode[0x%x] atype[0x%x] addr[%llx] " "ackfreq[%u] plnk_updt[0x%02x] opts[0x%02x] mtu[%llu] " @@ -163,6 +182,26 @@ static int handle_attr_info(struct vio_driver_state *vio, } port->rmtu = localmtu; + /* LSO negotiation */ + if (vio_version_after_eq(vio, 1, 7)) + port->tso &= !!(pkt->cflags & VNET_LSO_IPV4_CAPAB); + else + port->tso = false; + if (port->tso) { + if (!port->tsolen) + port->tsolen = VNET_MAXTSO; + port->tsolen = min(port->tsolen, pkt->ipv4_lso_maxlen); + if (port->tsolen < VNET_MINTSO) { + port->tso = false; + port->tsolen = 0; + pkt->cflags &= ~VNET_LSO_IPV4_CAPAB; + } + pkt->ipv4_lso_maxlen = port->tsolen; + } else { + pkt->cflags &= ~VNET_LSO_IPV4_CAPAB; + pkt->ipv4_lso_maxlen = 0; + } + /* for version >= 1.6, ACK packet mode we support */ if (vio_version_after_eq(vio, 1, 6)) { pkt->xfer_mode = VIO_NEW_DRING_MODE; @@ -274,10 +313,42 @@ static struct sk_buff *alloc_and_align_skb(struct net_device *dev, return skb; } -static int vnet_rx_one(struct vnet_port *port, unsigned int len, - struct ldc_trans_cookie *cookies, int ncookies) +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 err; @@ -299,7 +370,7 @@ static int vnet_rx_one(struct vnet_port *port, unsigned int len, skb_put(skb, copy_len); err = ldc_copy(port->vio.lp, LDC_COPY_IN, skb->data, copy_len, 0, - cookies, ncookies); + desc->cookies, desc->ncookies); if (unlikely(err < 0)) { dev->stats.rx_frame_errors++; goto out_free_skb; @@ -309,11 +380,33 @@ static int vnet_rx_one(struct vnet_port *port, unsigned int len, skb_trim(skb, len); skb->protocol = eth_type_trans(skb, dev); - dev->stats.rx_packets++; - dev->stats.rx_bytes += len; + if (vio_version_after_eq(&port->vio, 1, 8)) { + struct vio_net_dext *dext = vio_net_ext(desc); - netif_rx(skb); + if (dext->flags & VNET_PKT_HCK_IPV4_HDRCKSUM) { + if (skb->protocol == ETH_P_IP) { + struct iphdr *iph = (struct iphdr *)skb->data; + iph->check = 0; + ip_send_check(iph); + } + } + if ((dext->flags & VNET_PKT_HCK_FULLCKSUM) && + skb->ip_summed == CHECKSUM_NONE) + 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: @@ -373,23 +466,6 @@ static int vnet_send_ack(struct vnet_port *port, struct vio_dring_state *dr, return err; } -static u32 next_idx(u32 idx, struct vio_dring_state *dr) -{ - if (++idx == dr->num_entries) - idx = 0; - return idx; -} - -static u32 prev_idx(u32 idx, struct vio_dring_state *dr) -{ - if (idx == 0) - idx = dr->num_entries - 1; - else - idx--; - - return idx; -} - static struct vio_net_desc *get_rx_desc(struct vnet_port *port, struct vio_dring_state *dr, u32 index) @@ -430,6 +506,7 @@ static int vnet_walk_rx_one(struct vnet_port *port, struct vio_driver_state *vio = &port->vio; int err; + BUG_ON(desc == NULL); if (IS_ERR(desc)) return PTR_ERR(desc); @@ -444,7 +521,7 @@ static int vnet_walk_rx_one(struct vnet_port *port, desc->cookies[0].cookie_addr, desc->cookies[0].cookie_size); - err = vnet_rx_one(port, desc->size, desc->cookies, desc->ncookies); + err = vnet_rx_one(port, desc); if (err == -ECONNRESET) return err; desc->hdr.state = VIO_DESC_DONE; @@ -456,12 +533,14 @@ static int vnet_walk_rx_one(struct vnet_port *port, } static int vnet_walk_rx(struct vnet_port *port, struct vio_dring_state *dr, - u32 start, u32 end) + 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) ? prev_idx(start, dr) : next_idx(end, dr); + 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); @@ -471,10 +550,11 @@ static int vnet_walk_rx(struct vnet_port *port, struct vio_dring_state *dr, return err; if (err != 0) break; + (*npkts)++; if (ack_start == -1) ack_start = start; ack_end = start; - start = next_idx(start, dr); + start = vio_dring_next(dr, start); if (ack && start != end) { err = vnet_send_ack(port, dr, ack_start, ack_end, VIO_DRING_ACTIVE); @@ -482,13 +562,26 @@ static int vnet_walk_rx(struct vnet_port *port, struct vio_dring_state *dr, return err; ack_start = -1; } + if ((*npkts) >= budget) { + send_ack = false; + break; + } } if (unlikely(ack_start == -1)) - ack_start = ack_end = prev_idx(start, dr); - return vnet_send_ack(port, dr, ack_start, ack_end, VIO_DRING_STOPPED); + ack_start = ack_end = vio_dring_prev(dr, start); + if (send_ack) { + port->napi_resume = false; + return vnet_send_ack(port, dr, ack_start, ack_end, + VIO_DRING_STOPPED); + } else { + port->napi_resume = true; + port->napi_stop_idx = ack_end; + return 1; + } } -static int vnet_rx(struct vnet_port *port, void *msgbuf) +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]; @@ -505,11 +598,13 @@ static int vnet_rx(struct vnet_port *port, void *msgbuf) return 0; } - dr->rcv_nxt++; + 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); + 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) @@ -522,7 +617,7 @@ static int idx_is_pending(struct vio_dring_state *dr, u32 end) found = 1; break; } - idx = next_idx(idx, dr); + idx = vio_dring_next(dr, idx); } return found; } @@ -535,19 +630,26 @@ static int vnet_ack(struct vnet_port *port, void *msgbuf) 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; - if (unlikely(!idx_is_pending(dr, end))) + 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. */ - dr->cons = next_idx(end, dr); + dr->cons = vio_dring_next(dr, end); desc = vio_dring_entry(dr, dr->cons); - if (desc->hdr.state == VIO_DESC_READY && port->start_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. @@ -559,11 +661,10 @@ static int vnet_ack(struct vnet_port *port, void *msgbuf) } else { port->start_cons = true; } + netif_tx_unlock(dev); - - vp = port->vp; - dev = vp->dev; - if (unlikely(netif_queue_stopped(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; @@ -591,58 +692,64 @@ static int handle_mcast(struct vnet_port *port, void *msgbuf) return 0; } -static void maybe_tx_wakeup(unsigned long param) +/* 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 vnet *vp = (struct vnet *)param; - struct net_device *dev = vp->dev; - - netif_tx_lock(dev); - if (likely(netif_queue_stopped(dev))) { - struct vnet_port *port; - int wake = 1; + struct netdev_queue *txq; - list_for_each_entry(port, &vp->port_list, list) { - struct vio_dring_state *dr; + 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]; - if (vnet_tx_dring_avail(dr) < - VNET_TX_WAKEUP_THRESH(dr)) { - wake = 0; - break; - } - } - if (wake) - netif_wake_queue(dev); + dr = &port->vio.drings[VIO_DRIVER_TX_RING]; + netif_tx_wake_queue(txq); } - netif_tx_unlock(dev); + __netif_tx_unlock(txq); } -static void vnet_event(void *arg, int event) +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 vnet_port *port = arg; struct vio_driver_state *vio = &port->vio; - unsigned long flags; int tx_wakeup, err; + int npkts = 0; + int event = (port->rx_event & LDC_EVENT_RESET); - spin_lock_irqsave(&vio->lock, flags); - +ldc_ctrl: if (unlikely(event == LDC_EVENT_RESET || event == LDC_EVENT_UP)) { vio_link_state_change(vio, event); - spin_unlock_irqrestore(&vio->lock, flags); if (event == LDC_EVENT_RESET) { port->rmtu = 0; + port->tso = true; + port->tsolen = 0; vio_port_up(vio); } - return; + 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; - if (unlikely(event != LDC_EVENT_DATA_READY)) { - pr_warn("Unexpected LDC event %d\n", event); - spin_unlock_irqrestore(&vio->lock, flags); - return; - } + /* we dont expect any other bits than RESET, UP, DATA_READY */ + BUG_ON(event != LDC_EVENT_DATA_READY); tx_wakeup = err = 0; while (1) { @@ -651,6 +758,20 @@ static void vnet_event(void *arg, int event) 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) @@ -667,10 +788,22 @@ static void vnet_event(void *arg, int event) 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) { - err = vnet_rx(port, &msgbuf); + 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) @@ -691,15 +824,34 @@ static void vnet_event(void *arg, int event) if (err == -ECONNRESET) break; } - spin_unlock(&vio->lock); - /* Kick off a tasklet to wake the queue. We cannot call - * maybe_tx_wakeup directly here because we could deadlock on - * netif_tx_lock() with dev_watchdog() - */ if (unlikely(tx_wakeup && err != -ECONNRESET)) - tasklet_schedule(&port->vp->vnet_tx_wakeup); + 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); - local_irq_restore(flags); } static int __vnet_tx_trigger(struct vnet_port *port, u32 start) @@ -746,26 +898,19 @@ static int __vnet_tx_trigger(struct vnet_port *port, u32 start) return err; } -static inline bool port_is_up(struct vnet_port *vnet) -{ - struct vio_driver_state *vio = &vnet->vio; - - return !!(vio->hs_state & VIO_HS_COMPLETE); -} - 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(port, hp, hash) { + 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(port, &vp->port_list, list) { + list_for_each_entry_rcu(port, &vp->port_list, list) { if (!port->switch_port) continue; if (!port_is_up(port)) @@ -775,18 +920,6 @@ struct vnet_port *__tx_port_find(struct vnet *vp, struct sk_buff *skb) return NULL; } -struct vnet_port *tx_port_find(struct vnet *vp, struct sk_buff *skb) -{ - struct vnet_port *ret; - unsigned long flags; - - spin_lock_irqsave(&vp->lock, flags); - ret = __tx_port_find(vp, skb); - spin_unlock_irqrestore(&vp->lock, flags); - - return ret; -} - static struct sk_buff *vnet_clean_tx_ring(struct vnet_port *port, unsigned *pending) { @@ -847,11 +980,10 @@ static void vnet_clean_timer_expire(unsigned long port0) struct vnet_port *port = (struct vnet_port *)port0; struct sk_buff *freeskbs; unsigned pending; - unsigned long flags; - spin_lock_irqsave(&port->vio.lock, flags); + netif_tx_lock(port->vp->dev); freeskbs = vnet_clean_tx_ring(port, &pending); - spin_unlock_irqrestore(&port->vio.lock, flags); + netif_tx_unlock(port->vp->dev); vnet_free_skbs(freeskbs); @@ -862,11 +994,54 @@ static void vnet_clean_timer_expire(unsigned long port0) del_timer(&port->clean_timer); } -static inline struct sk_buff *vnet_skb_shape(struct sk_buff *skb, void **pstart, - int *plen) +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 len, pad; + int i, len, pad, docopy; len = skb->len; pad = 0; @@ -876,51 +1051,223 @@ static inline struct sk_buff *vnet_skb_shape(struct sk_buff *skb, void **pstart, } len += VNET_PACKET_SKIP; pad += 8 - (len & 7); - len += 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) { - nskb = alloc_and_align_skb(skb->dev, skb->len); + 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); - if (skb_copy_bits(skb, 0, nskb->data, skb->len)) { + + 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; + } dev_kfree_skb(skb); skb = nskb; } - - *pstart = skb->data - VNET_PACKET_SKIP; - *plen = len; 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) { + /* segment to TSO size */ + skb_shinfo(skb)->gso_size = datalen; + skb_shinfo(skb)->gso_segs = gso_segs; + + segs = skb_gso_segment(skb, dev->features & ~NETIF_F_TSO); + + /* restore gso_size & gso_segs */ + skb_shinfo(skb)->gso_size = gso_size; + skb_shinfo(skb)->gso_segs = DIV_ROUND_UP(skb->len - hlen, + gso_size); + } else + segs = skb_gso_segment(skb, dev->features & ~NETIF_F_TSO); + if (IS_ERR(segs)) { + dev->stats.tx_dropped++; + return NETDEV_TX_OK; + } + + 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; +} + static int vnet_start_xmit(struct sk_buff *skb, struct net_device *dev) { struct vnet *vp = netdev_priv(dev); - struct vnet_port *port = tx_port_find(vp, skb); + struct vnet_port *port = NULL; struct vio_dring_state *dr; struct vio_net_desc *d; - unsigned long flags; unsigned int len; struct sk_buff *freeskbs = NULL; int i, err, txi; - void *start = NULL; - int nlen = 0; unsigned pending = 0; + struct netdev_queue *txq; - if (unlikely(!port)) + rcu_read_lock(); + port = __tx_port_find(vp, skb); + if (unlikely(!port)) { + rcu_read_unlock(); goto out_dropped; + } - skb = vnet_skb_shape(skb, &start, &nlen); - - if (unlikely(!skb)) - 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->len > port->rmtu) { + if (!skb_is_gso(skb) && skb->len > port->rmtu) { unsigned long localmtu = port->rmtu - ETH_HLEN; if (vio_version_after_eq(&port->vio, 1, 3)) @@ -937,6 +1284,7 @@ static int vnet_start_xmit(struct sk_buff *skb, struct net_device *dev) 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, @@ -951,18 +1299,26 @@ static int vnet_start_xmit(struct sk_buff *skb, struct net_device *dev) goto out_dropped; } - spin_lock_irqsave(&port->vio.lock, flags); + 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_queue_stopped(dev)) { - netif_stop_queue(dev); + 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++; } - spin_unlock_irqrestore(&port->vio.lock, flags); + rcu_read_unlock(); return NETDEV_TX_BUSY; } @@ -978,16 +1334,15 @@ static int vnet_start_xmit(struct sk_buff *skb, struct net_device *dev) if (len < ETH_ZLEN) len = ETH_ZLEN; - port->tx_bufs[txi].skb = skb; - skb = NULL; - - err = ldc_map_single(port->vio.lp, start, nlen, - port->tx_bufs[txi].cookies, VNET_MAXCOOKIES, - (LDC_MAP_SHADOW | LDC_MAP_DIRECT | LDC_MAP_RW)); + 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_unlock; + 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(), @@ -1003,6 +1358,21 @@ static int vnet_start_xmit(struct sk_buff *skb, struct net_device *dev) 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. @@ -1039,7 +1409,7 @@ static int vnet_start_xmit(struct sk_buff *skb, struct net_device *dev) netdev_info(dev, "TX trigger error %d\n", err); d->hdr.state = VIO_DESC_FREE; dev->stats.tx_carrier_errors++; - goto out_dropped_unlock; + goto out_dropped; } ldc_start_done: @@ -1050,31 +1420,29 @@ ldc_start_done: dr->prod = (dr->prod + 1) & (VNET_TX_RING_SIZE - 1); if (unlikely(vnet_tx_dring_avail(dr) < 1)) { - netif_stop_queue(dev); + netif_tx_stop_queue(txq); if (vnet_tx_dring_avail(dr) > VNET_TX_WAKEUP_THRESH(dr)) - netif_wake_queue(dev); + netif_tx_wake_queue(txq); } - spin_unlock_irqrestore(&port->vio.lock, flags); + (void)mod_timer(&port->clean_timer, jiffies + VNET_CLEAN_TIMEOUT); + rcu_read_unlock(); vnet_free_skbs(freeskbs); - (void)mod_timer(&port->clean_timer, jiffies + VNET_CLEAN_TIMEOUT); - return NETDEV_TX_OK; -out_dropped_unlock: - spin_unlock_irqrestore(&port->vio.lock, flags); - out_dropped: - if (skb) - dev_kfree_skb(skb); - vnet_free_skbs(freeskbs); 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; } @@ -1087,14 +1455,14 @@ static void vnet_tx_timeout(struct net_device *dev) static int vnet_open(struct net_device *dev) { netif_carrier_on(dev); - netif_start_queue(dev); + netif_tx_start_all_queues(dev); return 0; } static int vnet_close(struct net_device *dev) { - netif_stop_queue(dev); + netif_tx_stop_all_queues(dev); netif_carrier_off(dev); return 0; @@ -1204,18 +1572,17 @@ static void vnet_set_rx_mode(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); + 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; } } - spin_unlock_irqrestore(&vp->lock, flags); + rcu_read_unlock(); } static int vnet_change_mtu(struct net_device *dev, int new_mtu) @@ -1295,18 +1662,20 @@ static void vnet_port_free_tx_bufs(struct vnet_port *port) } } -static int vnet_port_alloc_tx_bufs(struct vnet_port *port) +static int vnet_port_alloc_tx_ring(struct vnet_port *port) { struct vio_dring_state *dr; - unsigned long len; + unsigned long len, elen; int i, err, ncookies; void *dring; dr = &port->vio.drings[VIO_DRIVER_TX_RING]; - len = (VNET_TX_RING_SIZE * - (sizeof(struct vio_net_desc) + - (sizeof(struct ldc_trans_cookie) * 2))); + 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, @@ -1320,8 +1689,7 @@ static int vnet_port_alloc_tx_bufs(struct vnet_port *port) } dr->base = dring; - dr->entry_size = (sizeof(struct vio_net_desc) + - (sizeof(struct ldc_trans_cookie) * 2)); + dr->entry_size = elen; dr->num_entries = VNET_TX_RING_SIZE; dr->prod = dr->cons = 0; port->start_cons = true; /* need an initial trigger */ @@ -1342,6 +1710,21 @@ err_out: 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); @@ -1354,6 +1737,10 @@ static const struct net_device_ops vnet_ops = { .ndo_tx_timeout = vnet_tx_timeout, .ndo_change_mtu = vnet_change_mtu, .ndo_start_xmit = vnet_start_xmit, + .ndo_select_queue = vnet_select_queue, +#ifdef CONFIG_NET_POLL_CONTROLLER + .ndo_poll_controller = vnet_poll_controller, +#endif }; static struct vnet *vnet_new(const u64 *local_mac) @@ -1362,7 +1749,7 @@ static struct vnet *vnet_new(const u64 *local_mac) struct vnet *vp; int err, i; - dev = alloc_etherdev(sizeof(*vp)); + dev = alloc_etherdev_mqs(sizeof(*vp), VNET_MAX_TXQS, 1); if (!dev) return ERR_PTR(-ENOMEM); dev->needed_headroom = VNET_PACKET_SKIP + 8; @@ -1374,7 +1761,6 @@ static struct vnet *vnet_new(const u64 *local_mac) vp = netdev_priv(dev); spin_lock_init(&vp->lock); - tasklet_init(&vp->vnet_tx_wakeup, maybe_tx_wakeup, (unsigned long)vp); vp->dev = dev; INIT_LIST_HEAD(&vp->port_list); @@ -1387,6 +1773,10 @@ static struct vnet *vnet_new(const u64 *local_mac) dev->ethtool_ops = &vnet_ethtool_ops; dev->watchdog_timeo = VNET_TX_TIMEOUT; + dev->hw_features = NETIF_F_TSO | NETIF_F_GSO | NETIF_F_GSO_SOFTWARE | + NETIF_F_HW_CSUM | NETIF_F_SG; + dev->features = dev->hw_features; + err = register_netdev(dev); if (err) { pr_err("Cannot register net device, aborting\n"); @@ -1434,7 +1824,6 @@ static void vnet_cleanup(void) vp = list_first_entry(&vnet_list, struct vnet, list); list_del(&vp->list); dev = vp->dev; - tasklet_kill(&vp->vnet_tx_wakeup); /* vio_unregister_driver() should have cleaned up port_list */ BUG_ON(!list_empty(&vp->port_list)); unregister_netdev(dev); @@ -1489,6 +1878,25 @@ 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; @@ -1536,9 +1944,7 @@ static int vnet_port_probe(struct vio_dev *vdev, const struct vio_device_id *id) if (err) goto err_out_free_port; - err = vnet_port_alloc_tx_bufs(port); - if (err) - goto err_out_free_ldc; + netif_napi_add(port->vp->dev, &port->napi, vnet_poll, NAPI_POLL_WEIGHT); INIT_HLIST_NODE(&port->hash); INIT_LIST_HEAD(&port->list); @@ -1547,13 +1953,17 @@ static int vnet_port_probe(struct vio_dev *vdev, const struct vio_device_id *id) if (mdesc_get_property(hp, vdev->mp, "switch-port", NULL) != NULL) switch_port = 1; port->switch_port = switch_port; + port->tso = true; + port->tsolen = 0; spin_lock_irqsave(&vp->lock, flags); if (switch_port) - list_add(&port->list, &vp->port_list); + list_add_rcu(&port->list, &vp->port_list); else - list_add_tail(&port->list, &vp->port_list); - hlist_add_head(&port->hash, &vp->port_hash[vnet_hashfn(port->raddr)]); + 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); spin_unlock_irqrestore(&vp->lock, flags); dev_set_drvdata(&vdev->dev, port); @@ -1564,15 +1974,13 @@ static int vnet_port_probe(struct vio_dev *vdev, const struct vio_device_id *id) setup_timer(&port->clean_timer, vnet_clean_timer_expire, (unsigned long)port); + napi_enable(&port->napi); vio_port_up(&port->vio); mdesc_release(hp); return 0; -err_out_free_ldc: - vio_ldc_free(&port->vio); - err_out_free_port: kfree(port); @@ -1586,17 +1994,18 @@ static int vnet_port_remove(struct vio_dev *vdev) struct vnet_port *port = dev_get_drvdata(&vdev->dev); if (port) { - struct vnet *vp = port->vp; - unsigned long flags; del_timer_sync(&port->vio.timer); - del_timer_sync(&port->clean_timer); - spin_lock_irqsave(&vp->lock, flags); - list_del(&port->list); - hlist_del(&port->hash); - spin_unlock_irqrestore(&vp->lock, flags); + napi_disable(&port->napi); + + list_del_rcu(&port->list); + hlist_del_rcu(&port->hash); + synchronize_rcu(); + del_timer_sync(&port->clean_timer); + vnet_port_rm_txq(port); + netif_napi_del(&port->napi); vnet_port_free_tx_bufs(port); vio_ldc_free(&port->vio); |