diff options
author | Matt Carlson <mcarlson@broadcom.com> | 2011-05-19 12:12:44 +0000 |
---|---|---|
committer | David S. Miller <davem@davemloft.net> | 2011-05-19 17:59:59 -0400 |
commit | 2ffcc981d823a0518c627ca22d51ef72d0b7ca9a (patch) | |
tree | 72847aea34b0f898c4d7b43e05aec466c21a6159 /drivers/net | |
parent | 5b5ed8afe48ca6916daabf9822e7a19fc19fdab4 (diff) | |
download | op-kernel-dev-2ffcc981d823a0518c627ca22d51ef72d0b7ca9a.zip op-kernel-dev-2ffcc981d823a0518c627ca22d51ef72d0b7ca9a.tar.gz |
tg3: Set tx bug flags for more devices
It has been recently discovered that all tg3 devices have a 4Gb boundary
DMA problem, and that all 5755 and newer devices can't handle fragments
less than or equal to 8 bytes in size. This patch adjusts the flags and
removes tg3_start_xmit(). tg3_start_xmit_dma_bug() has been renamed to
tg3_start_xmit().
Signed-off-by: Matt Carlson <mcarlson@broadcom.com>
Reviewed-by: Michael Chan <mchan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net')
-rw-r--r-- | drivers/net/tg3.c | 262 |
1 files changed, 33 insertions, 229 deletions
diff --git a/drivers/net/tg3.c b/drivers/net/tg3.c index d5a1f9e..4c44168 100644 --- a/drivers/net/tg3.c +++ b/drivers/net/tg3.c @@ -5735,7 +5735,28 @@ static inline int tg3_40bit_overflow_test(struct tg3 *tp, dma_addr_t mapping, #endif } -static void tg3_set_txd(struct tg3_napi *, int, dma_addr_t, int, u32, u32); +static void tg3_set_txd(struct tg3_napi *tnapi, int entry, + dma_addr_t mapping, int len, u32 flags, + u32 mss_and_is_end) +{ + struct tg3_tx_buffer_desc *txd = &tnapi->tx_ring[entry]; + int is_end = (mss_and_is_end & 0x1); + u32 mss = (mss_and_is_end >> 1); + u32 vlan_tag = 0; + + if (is_end) + flags |= TXD_FLAG_END; + if (flags & TXD_FLAG_VLAN) { + vlan_tag = flags >> 16; + flags &= 0xffff; + } + vlan_tag |= (mss << TXD_MSS_SHIFT); + + txd->addr_hi = ((u64) mapping >> 32); + txd->addr_lo = ((u64) mapping & 0xffffffff); + txd->len_flags = (len << TXD_LEN_SHIFT) | flags; + txd->vlan_tag = vlan_tag << TXD_VLAN_TAG_SHIFT; +} /* Workaround 4GB and 40-bit hardware DMA bugs. */ static int tigon3_dma_hwbug_workaround(struct tg3_napi *tnapi, @@ -5818,202 +5839,7 @@ static int tigon3_dma_hwbug_workaround(struct tg3_napi *tnapi, return ret; } -static void tg3_set_txd(struct tg3_napi *tnapi, int entry, - dma_addr_t mapping, int len, u32 flags, - u32 mss_and_is_end) -{ - struct tg3_tx_buffer_desc *txd = &tnapi->tx_ring[entry]; - int is_end = (mss_and_is_end & 0x1); - u32 mss = (mss_and_is_end >> 1); - u32 vlan_tag = 0; - - if (is_end) - flags |= TXD_FLAG_END; - if (flags & TXD_FLAG_VLAN) { - vlan_tag = flags >> 16; - flags &= 0xffff; - } - vlan_tag |= (mss << TXD_MSS_SHIFT); - - txd->addr_hi = ((u64) mapping >> 32); - txd->addr_lo = ((u64) mapping & 0xffffffff); - txd->len_flags = (len << TXD_LEN_SHIFT) | flags; - txd->vlan_tag = vlan_tag << TXD_VLAN_TAG_SHIFT; -} - -/* hard_start_xmit for devices that don't have any bugs and - * support TG3_FLAG_HW_TSO_2 and TG3_FLAG_HW_TSO_3 only. - */ -static netdev_tx_t tg3_start_xmit(struct sk_buff *skb, - struct net_device *dev) -{ - struct tg3 *tp = netdev_priv(dev); - u32 len, entry, base_flags, mss; - dma_addr_t mapping; - struct tg3_napi *tnapi; - struct netdev_queue *txq; - unsigned int i, last; - - txq = netdev_get_tx_queue(dev, skb_get_queue_mapping(skb)); - tnapi = &tp->napi[skb_get_queue_mapping(skb)]; - if (tg3_flag(tp, ENABLE_TSS)) - tnapi++; - - /* We are running in BH disabled context with netif_tx_lock - * and TX reclaim runs via tp->napi.poll inside of a software - * interrupt. Furthermore, IRQ processing runs lockless so we have - * no IRQ context deadlocks to worry about either. Rejoice! - */ - if (unlikely(tg3_tx_avail(tnapi) <= (skb_shinfo(skb)->nr_frags + 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"); - } - return NETDEV_TX_BUSY; - } - - entry = tnapi->tx_prod; - base_flags = 0; - mss = skb_shinfo(skb)->gso_size; - if (mss) { - int tcp_opt_len, ip_tcp_len; - u32 hdrlen; - - if (skb_header_cloned(skb) && - pskb_expand_head(skb, 0, 0, GFP_ATOMIC)) { - dev_kfree_skb(skb); - goto out_unlock; - } - - if (skb_is_gso_v6(skb)) { - hdrlen = skb_headlen(skb) - ETH_HLEN; - } else { - struct iphdr *iph = ip_hdr(skb); - - tcp_opt_len = tcp_optlen(skb); - ip_tcp_len = ip_hdrlen(skb) + sizeof(struct tcphdr); - - iph->check = 0; - iph->tot_len = htons(mss + ip_tcp_len + tcp_opt_len); - hdrlen = ip_tcp_len + tcp_opt_len; - } - - if (tg3_flag(tp, HW_TSO_3)) { - mss |= (hdrlen & 0xc) << 12; - if (hdrlen & 0x10) - base_flags |= 0x00000010; - base_flags |= (hdrlen & 0x3e0) << 5; - } else - mss |= hdrlen << 9; - - base_flags |= (TXD_FLAG_CPU_PRE_DMA | - TXD_FLAG_CPU_POST_DMA); - - tcp_hdr(skb)->check = 0; - - } else if (skb->ip_summed == CHECKSUM_PARTIAL) { - base_flags |= TXD_FLAG_TCPUDP_CSUM; - } - - if (vlan_tx_tag_present(skb)) - base_flags |= (TXD_FLAG_VLAN | - (vlan_tx_tag_get(skb) << 16)); - - len = skb_headlen(skb); - - /* Queue skb data, a.k.a. the main skb fragment. */ - mapping = pci_map_single(tp->pdev, skb->data, len, PCI_DMA_TODEVICE); - if (pci_dma_mapping_error(tp->pdev, mapping)) { - dev_kfree_skb(skb); - goto out_unlock; - } - - tnapi->tx_buffers[entry].skb = skb; - dma_unmap_addr_set(&tnapi->tx_buffers[entry], mapping, mapping); - - if (tg3_flag(tp, USE_JUMBO_BDFLAG) && - !mss && skb->len > VLAN_ETH_FRAME_LEN) - base_flags |= TXD_FLAG_JMB_PKT; - - tg3_set_txd(tnapi, entry, mapping, len, base_flags, - (skb_shinfo(skb)->nr_frags == 0) | (mss << 1)); - - entry = NEXT_TX(entry); - - /* Now loop through additional data fragments, and queue them. */ - if (skb_shinfo(skb)->nr_frags > 0) { - last = skb_shinfo(skb)->nr_frags - 1; - for (i = 0; i <= last; i++) { - skb_frag_t *frag = &skb_shinfo(skb)->frags[i]; - - len = frag->size; - mapping = pci_map_page(tp->pdev, - frag->page, - frag->page_offset, - len, PCI_DMA_TODEVICE); - if (pci_dma_mapping_error(tp->pdev, mapping)) - goto dma_error; - - tnapi->tx_buffers[entry].skb = NULL; - dma_unmap_addr_set(&tnapi->tx_buffers[entry], mapping, - mapping); - - tg3_set_txd(tnapi, entry, mapping, len, - base_flags, (i == last) | (mss << 1)); - - entry = NEXT_TX(entry); - } - } - - /* Packets are ready, update Tx producer idx local and on card. */ - tw32_tx_mbox(tnapi->prodmbox, entry); - - tnapi->tx_prod = entry; - if (unlikely(tg3_tx_avail(tnapi) <= (MAX_SKB_FRAGS + 1))) { - netif_tx_stop_queue(txq); - - /* netif_tx_stop_queue() must be done before checking - * checking tx index in tg3_tx_avail() below, because in - * tg3_tx(), we update tx index before checking for - * netif_tx_queue_stopped(). - */ - smp_mb(); - if (tg3_tx_avail(tnapi) > TG3_TX_WAKEUP_THRESH(tnapi)) - netif_tx_wake_queue(txq); - } - -out_unlock: - mmiowb(); - - return NETDEV_TX_OK; - -dma_error: - last = i; - entry = tnapi->tx_prod; - tnapi->tx_buffers[entry].skb = NULL; - pci_unmap_single(tp->pdev, - dma_unmap_addr(&tnapi->tx_buffers[entry], mapping), - skb_headlen(skb), - PCI_DMA_TODEVICE); - for (i = 0; i <= last; i++) { - skb_frag_t *frag = &skb_shinfo(skb)->frags[i]; - entry = NEXT_TX(entry); - - pci_unmap_page(tp->pdev, - dma_unmap_addr(&tnapi->tx_buffers[entry], - mapping), - frag->size, PCI_DMA_TODEVICE); - } - - dev_kfree_skb(skb); - return NETDEV_TX_OK; -} - -static netdev_tx_t tg3_start_xmit_dma_bug(struct sk_buff *, - struct net_device *); +static netdev_tx_t tg3_start_xmit(struct sk_buff *, struct net_device *); /* Use GSO to workaround a rare TSO bug that may be triggered when the * TSO header is greater than 80 bytes. @@ -6047,7 +5873,7 @@ static int tg3_tso_bug(struct tg3 *tp, struct sk_buff *skb) nskb = segs; segs = segs->next; nskb->next = NULL; - tg3_start_xmit_dma_bug(nskb, tp->dev); + tg3_start_xmit(nskb, tp->dev); } while (segs); tg3_tso_bug_end: @@ -6059,8 +5885,7 @@ tg3_tso_bug_end: /* hard_start_xmit for devices that have the 4G bug and/or 40-bit bug and * support TG3_FLAG_HW_TSO_1 or firmware TSO only. */ -static netdev_tx_t tg3_start_xmit_dma_bug(struct sk_buff *skb, - struct net_device *dev) +static netdev_tx_t tg3_start_xmit(struct sk_buff *skb, struct net_device *dev) { struct tg3 *tp = netdev_priv(dev); u32 len, entry, base_flags, mss; @@ -13857,14 +13682,15 @@ static int __devinit tg3_get_invariants(struct tg3 *tp) } } - if (GET_ASIC_REV(tp->pci_chip_rev_id) == ASIC_REV_5717 || - GET_ASIC_REV(tp->pci_chip_rev_id) == ASIC_REV_5719 || - GET_ASIC_REV(tp->pci_chip_rev_id) == ASIC_REV_5906) + /* All chips can get confused if TX buffers + * straddle the 4GB address boundary. + */ + tg3_flag_set(tp, 4G_DMA_BNDRY_BUG); + + if (tg3_flag(tp, 5755_PLUS)) tg3_flag_set(tp, SHORT_DMA_BUG); - else if (!tg3_flag(tp, 5755_PLUS)) { - tg3_flag_set(tp, 4G_DMA_BNDRY_BUG); + else tg3_flag_set(tp, 40BIT_DMA_LIMIT_BUG); - } if (tg3_flag(tp, 5717_PLUS)) tg3_flag_set(tp, LRG_PROD_RING_CAP); @@ -15092,23 +14918,6 @@ static const struct net_device_ops tg3_netdev_ops = { #endif }; -static const struct net_device_ops tg3_netdev_ops_dma_bug = { - .ndo_open = tg3_open, - .ndo_stop = tg3_close, - .ndo_start_xmit = tg3_start_xmit_dma_bug, - .ndo_get_stats64 = tg3_get_stats64, - .ndo_validate_addr = eth_validate_addr, - .ndo_set_multicast_list = tg3_set_rx_mode, - .ndo_set_mac_address = tg3_set_mac_addr, - .ndo_do_ioctl = tg3_ioctl, - .ndo_tx_timeout = tg3_tx_timeout, - .ndo_change_mtu = tg3_change_mtu, - .ndo_set_features = tg3_set_features, -#ifdef CONFIG_NET_POLL_CONTROLLER - .ndo_poll_controller = tg3_poll_controller, -#endif -}; - static int __devinit tg3_init_one(struct pci_dev *pdev, const struct pci_device_id *ent) { @@ -15205,6 +15014,7 @@ static int __devinit tg3_init_one(struct pci_dev *pdev, dev->ethtool_ops = &tg3_ethtool_ops; dev->watchdog_timeo = TG3_TX_TIMEOUT; + dev->netdev_ops = &tg3_netdev_ops; dev->irq = pdev->irq; err = tg3_get_invariants(tp); @@ -15214,12 +15024,6 @@ static int __devinit tg3_init_one(struct pci_dev *pdev, goto err_out_iounmap; } - if (tg3_flag(tp, 5755_PLUS) && !tg3_flag(tp, 5717_PLUS)) - dev->netdev_ops = &tg3_netdev_ops; - else - dev->netdev_ops = &tg3_netdev_ops_dma_bug; - - /* The EPB bridge inside 5714, 5715, and 5780 and any * device behind the EPB cannot support DMA addresses > 40-bit. * On 64-bit systems with IOMMU, use 40-bit dma_mask. |