diff --git a/drivers/net/ethernet/freescale/enetc/enetc.c b/drivers/net/ethernet/freescale/enetc/enetc.c index 3cbfa8b4e265..09193b478ab3 100644 --- a/drivers/net/ethernet/freescale/enetc/enetc.c +++ b/drivers/net/ethernet/freescale/enetc/enetc.c @@ -8,6 +8,7 @@ #include #include #include +#include static int enetc_num_stack_tx_queues(struct enetc_ndev_priv *priv) { @@ -314,12 +315,261 @@ dma_err: return 0; } +static void enetc_map_tx_tso_hdr(struct enetc_bdr *tx_ring, struct sk_buff *skb, + struct enetc_tx_swbd *tx_swbd, + union enetc_tx_bd *txbd, int *i, int hdr_len, + int data_len) +{ + union enetc_tx_bd txbd_tmp; + u8 flags = 0, e_flags = 0; + dma_addr_t addr; + + enetc_clear_tx_bd(&txbd_tmp); + addr = tx_ring->tso_headers_dma + *i * TSO_HEADER_SIZE; + + if (skb_vlan_tag_present(skb)) + flags |= ENETC_TXBD_FLAGS_EX; + + txbd_tmp.addr = cpu_to_le64(addr); + txbd_tmp.buf_len = cpu_to_le16(hdr_len); + + /* first BD needs frm_len and offload flags set */ + txbd_tmp.frm_len = cpu_to_le16(hdr_len + data_len); + txbd_tmp.flags = flags; + + /* For the TSO header we do not set the dma address since we do not + * want it unmapped when we do cleanup. We still set len so that we + * count the bytes sent. + */ + tx_swbd->len = hdr_len; + tx_swbd->do_twostep_tstamp = false; + tx_swbd->check_wb = false; + + /* Actually write the header in the BD */ + *txbd = txbd_tmp; + + /* Add extension BD for VLAN */ + if (flags & ENETC_TXBD_FLAGS_EX) { + /* Get the next BD */ + enetc_bdr_idx_inc(tx_ring, i); + txbd = ENETC_TXBD(*tx_ring, *i); + tx_swbd = &tx_ring->tx_swbd[*i]; + prefetchw(txbd); + + /* Setup the VLAN fields */ + enetc_clear_tx_bd(&txbd_tmp); + txbd_tmp.ext.vid = cpu_to_le16(skb_vlan_tag_get(skb)); + txbd_tmp.ext.tpid = 0; /* < C-TAG */ + e_flags |= ENETC_TXBD_E_FLAGS_VLAN_INS; + + /* Write the BD */ + txbd_tmp.ext.e_flags = e_flags; + *txbd = txbd_tmp; + } +} + +static int enetc_map_tx_tso_data(struct enetc_bdr *tx_ring, struct sk_buff *skb, + struct enetc_tx_swbd *tx_swbd, + union enetc_tx_bd *txbd, char *data, + int size, bool last_bd) +{ + union enetc_tx_bd txbd_tmp; + dma_addr_t addr; + u8 flags = 0; + + enetc_clear_tx_bd(&txbd_tmp); + + addr = dma_map_single(tx_ring->dev, data, size, DMA_TO_DEVICE); + if (unlikely(dma_mapping_error(tx_ring->dev, addr))) { + netdev_err(tx_ring->ndev, "DMA map error\n"); + return -ENOMEM; + } + + if (last_bd) { + flags |= ENETC_TXBD_FLAGS_F; + tx_swbd->is_eof = 1; + } + + txbd_tmp.addr = cpu_to_le64(addr); + txbd_tmp.buf_len = cpu_to_le16(size); + txbd_tmp.flags = flags; + + tx_swbd->dma = addr; + tx_swbd->len = size; + tx_swbd->dir = DMA_TO_DEVICE; + + *txbd = txbd_tmp; + + return 0; +} + +static __wsum enetc_tso_hdr_csum(struct tso_t *tso, struct sk_buff *skb, + char *hdr, int hdr_len, int *l4_hdr_len) +{ + char *l4_hdr = hdr + skb_transport_offset(skb); + int mac_hdr_len = skb_network_offset(skb); + + if (tso->tlen != sizeof(struct udphdr)) { + struct tcphdr *tcph = (struct tcphdr *)(l4_hdr); + + tcph->check = 0; + } else { + struct udphdr *udph = (struct udphdr *)(l4_hdr); + + udph->check = 0; + } + + /* Compute the IP checksum. This is necessary since tso_build_hdr() + * already incremented the IP ID field. + */ + if (!tso->ipv6) { + struct iphdr *iph = (void *)(hdr + mac_hdr_len); + + iph->check = 0; + iph->check = ip_fast_csum((unsigned char *)iph, iph->ihl); + } + + /* Compute the checksum over the L4 header. */ + *l4_hdr_len = hdr_len - skb_transport_offset(skb); + return csum_partial(l4_hdr, *l4_hdr_len, 0); +} + +static void enetc_tso_complete_csum(struct enetc_bdr *tx_ring, struct tso_t *tso, + struct sk_buff *skb, char *hdr, int len, + __wsum sum) +{ + char *l4_hdr = hdr + skb_transport_offset(skb); + __sum16 csum_final; + + /* Complete the L4 checksum by appending the pseudo-header to the + * already computed checksum. + */ + if (!tso->ipv6) + csum_final = csum_tcpudp_magic(ip_hdr(skb)->saddr, + ip_hdr(skb)->daddr, + len, ip_hdr(skb)->protocol, sum); + else + csum_final = csum_ipv6_magic(&ipv6_hdr(skb)->saddr, + &ipv6_hdr(skb)->daddr, + len, ipv6_hdr(skb)->nexthdr, sum); + + if (tso->tlen != sizeof(struct udphdr)) { + struct tcphdr *tcph = (struct tcphdr *)(l4_hdr); + + tcph->check = csum_final; + } else { + struct udphdr *udph = (struct udphdr *)(l4_hdr); + + udph->check = csum_final; + } +} + +static int enetc_map_tx_tso_buffs(struct enetc_bdr *tx_ring, struct sk_buff *skb) +{ + int hdr_len, total_len, data_len; + struct enetc_tx_swbd *tx_swbd; + union enetc_tx_bd *txbd; + struct tso_t tso; + __wsum csum, csum2; + int count = 0, pos; + int err, i, bd_data_num; + + /* Initialize the TSO handler, and prepare the first payload */ + hdr_len = tso_start(skb, &tso); + total_len = skb->len - hdr_len; + i = tx_ring->next_to_use; + + while (total_len > 0) { + char *hdr; + + /* Get the BD */ + txbd = ENETC_TXBD(*tx_ring, i); + tx_swbd = &tx_ring->tx_swbd[i]; + prefetchw(txbd); + + /* Determine the length of this packet */ + data_len = min_t(int, skb_shinfo(skb)->gso_size, total_len); + total_len -= data_len; + + /* prepare packet headers: MAC + IP + TCP */ + hdr = tx_ring->tso_headers + i * TSO_HEADER_SIZE; + tso_build_hdr(skb, hdr, &tso, data_len, total_len == 0); + + /* compute the csum over the L4 header */ + csum = enetc_tso_hdr_csum(&tso, skb, hdr, hdr_len, &pos); + enetc_map_tx_tso_hdr(tx_ring, skb, tx_swbd, txbd, &i, hdr_len, data_len); + bd_data_num = 0; + count++; + + while (data_len > 0) { + int size; + + size = min_t(int, tso.size, data_len); + + /* Advance the index in the BDR */ + enetc_bdr_idx_inc(tx_ring, &i); + txbd = ENETC_TXBD(*tx_ring, i); + tx_swbd = &tx_ring->tx_swbd[i]; + prefetchw(txbd); + + /* Compute the checksum over this segment of data and + * add it to the csum already computed (over the L4 + * header and possible other data segments). + */ + csum2 = csum_partial(tso.data, size, 0); + csum = csum_block_add(csum, csum2, pos); + pos += size; + + err = enetc_map_tx_tso_data(tx_ring, skb, tx_swbd, txbd, + tso.data, size, + size == data_len); + if (err) + goto err_map_data; + + data_len -= size; + count++; + bd_data_num++; + tso_build_data(skb, &tso, size); + + if (unlikely(bd_data_num >= ENETC_MAX_SKB_FRAGS && data_len)) + goto err_chained_bd; + } + + enetc_tso_complete_csum(tx_ring, &tso, skb, hdr, pos, csum); + + if (total_len == 0) + tx_swbd->skb = skb; + + /* Go to the next BD */ + enetc_bdr_idx_inc(tx_ring, &i); + } + + tx_ring->next_to_use = i; + enetc_update_tx_ring_tail(tx_ring); + + return count; + +err_map_data: + dev_err(tx_ring->dev, "DMA map error"); + +err_chained_bd: + do { + tx_swbd = &tx_ring->tx_swbd[i]; + enetc_free_tx_frame(tx_ring, tx_swbd); + if (i == 0) + i = tx_ring->bd_count; + i--; + } while (count--); + + return 0; +} + static netdev_tx_t enetc_start_xmit(struct sk_buff *skb, struct net_device *ndev) { struct enetc_ndev_priv *priv = netdev_priv(ndev); struct enetc_bdr *tx_ring; - int count; + int count, err; /* Queue one-step Sync packet if already locked */ if (skb->cb[0] & ENETC_F_TX_ONESTEP_SYNC_TSTAMP) { @@ -332,20 +582,36 @@ static netdev_tx_t enetc_start_xmit(struct sk_buff *skb, tx_ring = priv->tx_ring[skb->queue_mapping]; - if (unlikely(skb_shinfo(skb)->nr_frags > ENETC_MAX_SKB_FRAGS)) - if (unlikely(skb_linearize(skb))) - goto drop_packet_err; + if (skb_is_gso(skb)) { + if (enetc_bd_unused(tx_ring) < tso_count_descs(skb)) { + netif_stop_subqueue(ndev, tx_ring->index); + return NETDEV_TX_BUSY; + } - count = skb_shinfo(skb)->nr_frags + 1; /* fragments + head */ - if (enetc_bd_unused(tx_ring) < ENETC_TXBDS_NEEDED(count)) { - netif_stop_subqueue(ndev, tx_ring->index); - return NETDEV_TX_BUSY; + enetc_lock_mdio(); + count = enetc_map_tx_tso_buffs(tx_ring, skb); + enetc_unlock_mdio(); + } else { + if (unlikely(skb_shinfo(skb)->nr_frags > ENETC_MAX_SKB_FRAGS)) + if (unlikely(skb_linearize(skb))) + goto drop_packet_err; + + count = skb_shinfo(skb)->nr_frags + 1; /* fragments + head */ + if (enetc_bd_unused(tx_ring) < ENETC_TXBDS_NEEDED(count)) { + netif_stop_subqueue(ndev, tx_ring->index); + return NETDEV_TX_BUSY; + } + + if (skb->ip_summed == CHECKSUM_PARTIAL) { + err = skb_checksum_help(skb); + if (err) + goto drop_packet_err; + } + enetc_lock_mdio(); + count = enetc_map_tx_buffs(tx_ring, skb); + enetc_unlock_mdio(); } - enetc_lock_mdio(); - count = enetc_map_tx_buffs(tx_ring, skb); - enetc_unlock_mdio(); - if (unlikely(!count)) goto drop_packet_err; @@ -1493,15 +1759,30 @@ static int enetc_alloc_txbdr(struct enetc_bdr *txr) return -ENOMEM; err = enetc_dma_alloc_bdr(txr, sizeof(union enetc_tx_bd)); - if (err) { - vfree(txr->tx_swbd); - return err; - } + if (err) + goto err_alloc_bdr; + + txr->tso_headers = dma_alloc_coherent(txr->dev, + txr->bd_count * TSO_HEADER_SIZE, + &txr->tso_headers_dma, + GFP_KERNEL); + if (err) + goto err_alloc_tso; txr->next_to_clean = 0; txr->next_to_use = 0; return 0; + +err_alloc_tso: + dma_free_coherent(txr->dev, txr->bd_count * sizeof(union enetc_tx_bd), + txr->bd_base, txr->bd_dma_base); + txr->bd_base = NULL; +err_alloc_bdr: + vfree(txr->tx_swbd); + txr->tx_swbd = NULL; + + return err; } static void enetc_free_txbdr(struct enetc_bdr *txr) @@ -1513,6 +1794,10 @@ static void enetc_free_txbdr(struct enetc_bdr *txr) size = txr->bd_count * sizeof(union enetc_tx_bd); + dma_free_coherent(txr->dev, txr->bd_count * TSO_HEADER_SIZE, + txr->tso_headers, txr->tso_headers_dma); + txr->tso_headers = NULL; + dma_free_coherent(txr->dev, size, txr->bd_base, txr->bd_dma_base); txr->bd_base = NULL; diff --git a/drivers/net/ethernet/freescale/enetc/enetc.h b/drivers/net/ethernet/freescale/enetc/enetc.h index 08b283347d9c..fb39e406b7fc 100644 --- a/drivers/net/ethernet/freescale/enetc/enetc.h +++ b/drivers/net/ethernet/freescale/enetc/enetc.h @@ -112,6 +112,10 @@ struct enetc_bdr { dma_addr_t bd_dma_base; u8 tsd_enable; /* Time specific departure */ bool ext_en; /* enable h/w descriptor extensions */ + + /* DMA buffer for TSO headers */ + char *tso_headers; + dma_addr_t tso_headers_dma; } ____cacheline_aligned_in_smp; static inline void enetc_bdr_idx_inc(struct enetc_bdr *bdr, int *i) diff --git a/drivers/net/ethernet/freescale/enetc/enetc_pf.c b/drivers/net/ethernet/freescale/enetc/enetc_pf.c index 628a74ba630c..8281dd664f4e 100644 --- a/drivers/net/ethernet/freescale/enetc/enetc_pf.c +++ b/drivers/net/ethernet/freescale/enetc/enetc_pf.c @@ -759,10 +759,14 @@ static void enetc_pf_netdev_setup(struct enetc_si *si, struct net_device *ndev, ndev->hw_features = NETIF_F_SG | NETIF_F_RXCSUM | NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_CTAG_RX | - NETIF_F_HW_VLAN_CTAG_FILTER | NETIF_F_LOOPBACK; + NETIF_F_HW_VLAN_CTAG_FILTER | NETIF_F_LOOPBACK | + NETIF_F_HW_CSUM | NETIF_F_TSO | NETIF_F_TSO6; ndev->features = NETIF_F_HIGHDMA | NETIF_F_SG | NETIF_F_RXCSUM | NETIF_F_HW_VLAN_CTAG_TX | - NETIF_F_HW_VLAN_CTAG_RX; + NETIF_F_HW_VLAN_CTAG_RX | + NETIF_F_HW_CSUM | NETIF_F_TSO | NETIF_F_TSO6; + ndev->vlan_features = NETIF_F_SG | NETIF_F_HW_CSUM | + NETIF_F_TSO | NETIF_F_TSO6; if (si->num_rss) ndev->hw_features |= NETIF_F_RXHASH; diff --git a/drivers/net/ethernet/freescale/enetc/enetc_vf.c b/drivers/net/ethernet/freescale/enetc/enetc_vf.c index 0704f6bf12fd..df312c9f8243 100644 --- a/drivers/net/ethernet/freescale/enetc/enetc_vf.c +++ b/drivers/net/ethernet/freescale/enetc/enetc_vf.c @@ -122,10 +122,14 @@ static void enetc_vf_netdev_setup(struct enetc_si *si, struct net_device *ndev, ndev->hw_features = NETIF_F_SG | NETIF_F_RXCSUM | NETIF_F_HW_VLAN_CTAG_TX | - NETIF_F_HW_VLAN_CTAG_RX; + NETIF_F_HW_VLAN_CTAG_RX | + NETIF_F_HW_CSUM | NETIF_F_TSO | NETIF_F_TSO6; ndev->features = NETIF_F_HIGHDMA | NETIF_F_SG | NETIF_F_RXCSUM | NETIF_F_HW_VLAN_CTAG_TX | - NETIF_F_HW_VLAN_CTAG_RX; + NETIF_F_HW_VLAN_CTAG_RX | + NETIF_F_HW_CSUM | NETIF_F_TSO | NETIF_F_TSO6; + ndev->vlan_features = NETIF_F_SG | NETIF_F_HW_CSUM | + NETIF_F_TSO | NETIF_F_TSO6; if (si->num_rss) ndev->hw_features |= NETIF_F_RXHASH;