/* * Copyright (c) 2013 Johannes Berg * * This file is free software: you may copy, redistribute and/or modify it * under the terms of the GNU General Public License as published by the * Free Software Foundation, either version 2 of the License, or (at your * option) any later version. * * This file is distributed in the hope that it will be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program. If not, see . * * This file incorporates work covered by the following copyright and * permission notice: * * Copyright (c) 2012 Qualcomm Atheros, Inc. * * Permission to use, copy, modify, and/or distribute this software for any * purpose with or without fee is hereby granted, provided that the above * copyright notice and this permission notice appear in all copies. * * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include "alx.h" #include "hw.h" #include "reg.h" const char alx_drv_name[] = "alx"; static void alx_free_txbuf(struct alx_priv *alx, int entry) { struct alx_buffer *txb = &alx->txq.bufs[entry]; if (dma_unmap_len(txb, size)) { dma_unmap_single(&alx->hw.pdev->dev, dma_unmap_addr(txb, dma), dma_unmap_len(txb, size), DMA_TO_DEVICE); dma_unmap_len_set(txb, size, 0); } if (txb->skb) { dev_kfree_skb_any(txb->skb); txb->skb = NULL; } } static int alx_refill_rx_ring(struct alx_priv *alx, gfp_t gfp) { struct alx_rx_queue *rxq = &alx->rxq; struct sk_buff *skb; struct alx_buffer *cur_buf; dma_addr_t dma; u16 cur, next, count = 0; next = cur = rxq->write_idx; if (++next == alx->rx_ringsz) next = 0; cur_buf = &rxq->bufs[cur]; while (!cur_buf->skb && next != rxq->read_idx) { struct alx_rfd *rfd = &rxq->rfd[cur]; skb = __netdev_alloc_skb(alx->dev, alx->rxbuf_size, gfp); if (!skb) break; dma = dma_map_single(&alx->hw.pdev->dev, skb->data, alx->rxbuf_size, DMA_FROM_DEVICE); if (dma_mapping_error(&alx->hw.pdev->dev, dma)) { dev_kfree_skb(skb); break; } /* Unfortunately, RX descriptor buffers must be 4-byte * aligned, so we can't use IP alignment. */ if (WARN_ON(dma & 3)) { dev_kfree_skb(skb); break; } cur_buf->skb = skb; dma_unmap_len_set(cur_buf, size, alx->rxbuf_size); dma_unmap_addr_set(cur_buf, dma, dma); rfd->addr = cpu_to_le64(dma); cur = next; if (++next == alx->rx_ringsz) next = 0; cur_buf = &rxq->bufs[cur]; count++; } if (count) { /* flush all updates before updating hardware */ wmb(); rxq->write_idx = cur; alx_write_mem16(&alx->hw, ALX_RFD_PIDX, cur); } return count; } static inline int alx_tpd_avail(struct alx_priv *alx) { struct alx_tx_queue *txq = &alx->txq; if (txq->write_idx >= txq->read_idx) return alx->tx_ringsz + txq->read_idx - txq->write_idx - 1; return txq->read_idx - txq->write_idx - 1; } static bool alx_clean_tx_irq(struct alx_priv *alx) { struct alx_tx_queue *txq = &alx->txq; u16 hw_read_idx, sw_read_idx; unsigned int total_bytes = 0, total_packets = 0; int budget = ALX_DEFAULT_TX_WORK; sw_read_idx = txq->read_idx; hw_read_idx = alx_read_mem16(&alx->hw, ALX_TPD_PRI0_CIDX); if (sw_read_idx != hw_read_idx) { while (sw_read_idx != hw_read_idx && budget > 0) { struct sk_buff *skb; skb = txq->bufs[sw_read_idx].skb; if (skb) { total_bytes += skb->len; total_packets++; budget--; } alx_free_txbuf(alx, sw_read_idx); if (++sw_read_idx == alx->tx_ringsz) sw_read_idx = 0; } txq->read_idx = sw_read_idx; netdev_completed_queue(alx->dev, total_packets, total_bytes); } if (netif_queue_stopped(alx->dev) && netif_carrier_ok(alx->dev) && alx_tpd_avail(alx) > alx->tx_ringsz/4) netif_wake_queue(alx->dev); return sw_read_idx == hw_read_idx; } static void alx_schedule_link_check(struct alx_priv *alx) { schedule_work(&alx->link_check_wk); } static void alx_schedule_reset(struct alx_priv *alx) { schedule_work(&alx->reset_wk); } static bool alx_clean_rx_irq(struct alx_priv *alx, int budget) { struct alx_rx_queue *rxq = &alx->rxq; struct alx_rrd *rrd; struct alx_buffer *rxb; struct sk_buff *skb; u16 length, rfd_cleaned = 0; while (budget > 0) { rrd = &rxq->rrd[rxq->rrd_read_idx]; if (!(rrd->word3 & cpu_to_le32(1 << RRD_UPDATED_SHIFT))) break; rrd->word3 &= ~cpu_to_le32(1 << RRD_UPDATED_SHIFT); if (ALX_GET_FIELD(le32_to_cpu(rrd->word0), RRD_SI) != rxq->read_idx || ALX_GET_FIELD(le32_to_cpu(rrd->word0), RRD_NOR) != 1) { alx_schedule_reset(alx); return 0; } rxb = &rxq->bufs[rxq->read_idx]; dma_unmap_single(&alx->hw.pdev->dev, dma_unmap_addr(rxb, dma), dma_unmap_len(rxb, size), DMA_FROM_DEVICE); dma_unmap_len_set(rxb, size, 0); skb = rxb->skb; rxb->skb = NULL; if (rrd->word3 & cpu_to_le32(1 << RRD_ERR_RES_SHIFT) || rrd->word3 & cpu_to_le32(1 << RRD_ERR_LEN_SHIFT)) { rrd->word3 = 0; dev_kfree_skb_any(skb); goto next_pkt; } length = ALX_GET_FIELD(le32_to_cpu(rrd->word3), RRD_PKTLEN) - ETH_FCS_LEN; skb_put(skb, length); skb->protocol = eth_type_trans(skb, alx->dev); skb_checksum_none_assert(skb); if (alx->dev->features & NETIF_F_RXCSUM && !(rrd->word3 & (cpu_to_le32(1 << RRD_ERR_L4_SHIFT) | cpu_to_le32(1 << RRD_ERR_IPV4_SHIFT)))) { switch (ALX_GET_FIELD(le32_to_cpu(rrd->word2), RRD_PID)) { case RRD_PID_IPV6UDP: case RRD_PID_IPV4UDP: case RRD_PID_IPV4TCP: case RRD_PID_IPV6TCP: skb->ip_summed = CHECKSUM_UNNECESSARY; break; } } napi_gro_receive(&alx->napi, skb); budget--; next_pkt: if (++rxq->read_idx == alx->rx_ringsz) rxq->read_idx = 0; if (++rxq->rrd_read_idx == alx->rx_ringsz) rxq->rrd_read_idx = 0; if (++rfd_cleaned > ALX_RX_ALLOC_THRESH) rfd_cleaned -= alx_refill_rx_ring(alx, GFP_ATOMIC); } if (rfd_cleaned) alx_refill_rx_ring(alx, GFP_ATOMIC); return budget > 0; } static int alx_poll(struct napi_struct *napi, int budget) { struct alx_priv *alx = container_of(napi, struct alx_priv, napi); struct alx_hw *hw = &alx->hw; bool complete = true; unsigned long flags; complete = alx_clean_tx_irq(alx) && alx_clean_rx_irq(alx, budget); if (!complete) return 1; napi_complete(&alx->napi); /* enable interrupt */ spin_lock_irqsave(&alx->irq_lock, flags); alx->int_mask |= ALX_ISR_TX_Q0 | ALX_ISR_RX_Q0; alx_write_mem32(hw, ALX_IMR, alx->int_mask); spin_unlock_irqrestore(&alx->irq_lock, flags); alx_post_write(hw); return 0; } static irqreturn_t alx_intr_handle(struct alx_priv *alx, u32 intr) { struct alx_hw *hw = &alx->hw; bool write_int_mask = false; spin_lock(&alx->irq_lock); /* ACK interrupt */ alx_write_mem32(hw, ALX_ISR, intr | ALX_ISR_DIS); intr &= alx->int_mask; if (intr & ALX_ISR_FATAL) { netif_warn(alx, hw, alx->dev, "fatal interrupt 0x%x, resetting\n", intr); alx_schedule_reset(alx); goto out; } if (intr & ALX_ISR_ALERT) netdev_warn(alx->dev, "alert interrupt: 0x%x\n", intr); if (intr & ALX_ISR_PHY) { /* suppress PHY interrupt, because the source * is from PHY internal. only the internal status * is cleared, the interrupt status could be cleared. */ alx->int_mask &= ~ALX_ISR_PHY; write_int_mask = true; alx_schedule_link_check(alx); } if (intr & (ALX_ISR_TX_Q0 | ALX_ISR_RX_Q0)) { napi_schedule(&alx->napi); /* mask rx/tx interrupt, enable them when napi complete */ alx->int_mask &= ~ALX_ISR_ALL_QUEUES; write_int_mask = true; } if (write_int_mask) alx_write_mem32(hw, ALX_IMR, alx->int_mask); alx_write_mem32(hw, ALX_ISR, 0); out: spin_unlock(&alx->irq_lock); return IRQ_HANDLED; } static irqreturn_t alx_intr_msi(int irq, void *data) { struct alx_priv *alx = data; return alx_intr_handle(alx, alx_read_mem32(&alx->hw, ALX_ISR)); } static irqreturn_t alx_intr_legacy(int irq, void *data) { struct alx_priv *alx = data; struct alx_hw *hw = &alx->hw; u32 intr; intr = alx_read_mem32(hw, ALX_ISR); if (intr & ALX_ISR_DIS || !(intr & alx->int_mask)) return IRQ_NONE; return alx_intr_handle(alx, intr); } static void alx_init_ring_ptrs(struct alx_priv *alx) { struct alx_hw *hw = &alx->hw; u32 addr_hi = ((u64)alx->descmem.dma) >> 32; alx->rxq.read_idx = 0; alx->rxq.write_idx = 0; alx->rxq.rrd_read_idx = 0; alx_write_mem32(hw, ALX_RX_BASE_ADDR_HI, addr_hi); alx_write_mem32(hw, ALX_RRD_ADDR_LO, alx->rxq.rrd_dma); alx_write_mem32(hw, ALX_RRD_RING_SZ, alx->rx_ringsz); alx_write_mem32(hw, ALX_RFD_ADDR_LO, alx->rxq.rfd_dma); alx_write_mem32(hw, ALX_RFD_RING_SZ, alx->rx_ringsz); alx_write_mem32(hw, ALX_RFD_BUF_SZ, alx->rxbuf_size); alx->txq.read_idx = 0; alx->txq.write_idx = 0; alx_write_mem32(hw, ALX_TX_BASE_ADDR_HI, addr_hi); alx_write_mem32(hw, ALX_TPD_PRI0_ADDR_LO, alx->txq.tpd_dma); alx_write_mem32(hw, ALX_TPD_RING_SZ, alx->tx_ringsz); /* load these pointers into the chip */ alx_write_mem32(hw, ALX_SRAM9, ALX_SRAM_LOAD_PTR); } static void alx_free_txring_buf(struct alx_priv *alx) { struct alx_tx_queue *txq = &alx->txq; int i; if (!txq->bufs) return; for (i = 0; i < alx->tx_ringsz; i++) alx_free_txbuf(alx, i); memset(txq->bufs, 0, alx->tx_ringsz * sizeof(struct alx_buffer)); memset(txq->tpd, 0, alx->tx_ringsz * sizeof(struct alx_txd)); txq->write_idx = 0; txq->read_idx = 0; netdev_reset_queue(alx->dev); } static void alx_free_rxring_buf(struct alx_priv *alx) { struct alx_rx_queue *rxq = &alx->rxq; struct alx_buffer *cur_buf; u16 i; if (rxq == NULL) return; for (i = 0; i < alx->rx_ringsz; i++) { cur_buf = rxq->bufs + i; if (cur_buf->skb) { dma_unmap_single(&alx->hw.pdev->dev, dma_unmap_addr(cur_buf, dma), dma_unmap_len(cur_buf, size), DMA_FROM_DEVICE); dev_kfree_skb(cur_buf->skb); cur_buf->skb = NULL; dma_unmap_len_set(cur_buf, size, 0); dma_unmap_addr_set(cur_buf, dma, 0); } } rxq->write_idx = 0; rxq->read_idx = 0; rxq->rrd_read_idx = 0; } static void alx_free_buffers(struct alx_priv *alx) { alx_free_txring_buf(alx); alx_free_rxring_buf(alx); } static int alx_reinit_rings(struct alx_priv *alx) { alx_free_buffers(alx); alx_init_ring_ptrs(alx); if (!alx_refill_rx_ring(alx, GFP_KERNEL)) return -ENOMEM; return 0; } static void alx_add_mc_addr(struct alx_hw *hw, const u8 *addr, u32 *mc_hash) { u32 crc32, bit, reg; crc32 = ether_crc(ETH_ALEN, addr); reg = (crc32 >> 31) & 0x1; bit = (crc32 >> 26) & 0x1F; mc_hash[reg] |= BIT(bit); } static void __alx_set_rx_mode(struct net_device *netdev) { struct alx_priv *alx = netdev_priv(netdev); struct alx_hw *hw = &alx->hw; struct netdev_hw_addr *ha; u32 mc_hash[2] = {}; if (!(netdev->flags & IFF_ALLMULTI)) { netdev_for_each_mc_addr(ha, netdev) alx_add_mc_addr(hw, ha->addr, mc_hash); alx_write_mem32(hw, ALX_HASH_TBL0, mc_hash[0]); alx_write_mem32(hw, ALX_HASH_TBL1, mc_hash[1]); } hw->rx_ctrl &= ~(ALX_MAC_CTRL_MULTIALL_EN | ALX_MAC_CTRL_PROMISC_EN); if (netdev->flags & IFF_PROMISC) hw->rx_ctrl |= ALX_MAC_CTRL_PROMISC_EN; if (netdev->flags & IFF_ALLMULTI) hw->rx_ctrl |= ALX_MAC_CTRL_MULTIALL_EN; alx_write_mem32(hw, ALX_MAC_CTRL, hw->rx_ctrl); } static void alx_set_rx_mode(struct net_device *netdev) { __alx_set_rx_mode(netdev); } static int alx_set_mac_address(struct net_device *netdev, void *data) { struct alx_priv *alx = netdev_priv(netdev); struct alx_hw *hw = &alx->hw; struct sockaddr *addr = data; if (!is_valid_ether_addr(addr->sa_data)) return -EADDRNOTAVAIL; if (netdev->addr_assign_type & NET_ADDR_RANDOM) netdev->addr_assign_type ^= NET_ADDR_RANDOM; memcpy(netdev->dev_addr, addr->sa_data, netdev->addr_len); memcpy(hw->mac_addr, addr->sa_data, netdev->addr_len); alx_set_macaddr(hw, hw->mac_addr); return 0; } static int alx_alloc_descriptors(struct alx_priv *alx) { alx->txq.bufs = kcalloc(alx->tx_ringsz, sizeof(struct alx_buffer), GFP_KERNEL); if (!alx->txq.bufs) return -ENOMEM; alx->rxq.bufs = kcalloc(alx->rx_ringsz, sizeof(struct alx_buffer), GFP_KERNEL); if (!alx->rxq.bufs) goto out_free; /* physical tx/rx ring descriptors * * Allocate them as a single chunk because they must not cross a * 4G boundary (hardware has a single register for high 32 bits * of addresses only) */ alx->descmem.size = sizeof(struct alx_txd) * alx->tx_ringsz + sizeof(struct alx_rrd) * alx->rx_ringsz + sizeof(struct alx_rfd) * alx->rx_ringsz; alx->descmem.virt = dma_zalloc_coherent(&alx->hw.pdev->dev, alx->descmem.size, &alx->descmem.dma, GFP_KERNEL); if (!alx->descmem.virt) goto out_free; alx->txq.tpd = alx->descmem.virt; alx->txq.tpd_dma = alx->descmem.dma; /* alignment requirement for next block */ BUILD_BUG_ON(sizeof(struct alx_txd) % 8); alx->rxq.rrd = (void *)((u8 *)alx->descmem.virt + sizeof(struct alx_txd) * alx->tx_ringsz); alx->rxq.rrd_dma = alx->descmem.dma + sizeof(struct alx_txd) * alx->tx_ringsz; /* alignment requirement for next block */ BUILD_BUG_ON(sizeof(struct alx_rrd) % 8); alx->rxq.rfd = (void *)((u8 *)alx->descmem.virt + sizeof(struct alx_txd) * alx->tx_ringsz + sizeof(struct alx_rrd) * alx->rx_ringsz); alx->rxq.rfd_dma = alx->descmem.dma + sizeof(struct alx_txd) * alx->tx_ringsz + sizeof(struct alx_rrd) * alx->rx_ringsz; return 0; out_free: kfree(alx->txq.bufs); kfree(alx->rxq.bufs); return -ENOMEM; } static int alx_alloc_rings(struct alx_priv *alx) { int err; err = alx_alloc_descriptors(alx); if (err) return err; alx->int_mask &= ~ALX_ISR_ALL_QUEUES; alx->int_mask |= ALX_ISR_TX_Q0 | ALX_ISR_RX_Q0; alx->tx_ringsz = alx->tx_ringsz; netif_napi_add(alx->dev, &alx->napi, alx_poll, 64); alx_reinit_rings(alx); return 0; } static void alx_free_rings(struct alx_priv *alx) { netif_napi_del(&alx->napi); alx_free_buffers(alx); kfree(alx->txq.bufs); kfree(alx->rxq.bufs); dma_free_coherent(&alx->hw.pdev->dev, alx->descmem.size, alx->descmem.virt, alx->descmem.dma); } static void alx_config_vector_mapping(struct alx_priv *alx) { struct alx_hw *hw = &alx->hw; alx_write_mem32(hw, ALX_MSI_MAP_TBL1, 0); alx_write_mem32(hw, ALX_MSI_MAP_TBL2, 0); alx_write_mem32(hw, ALX_MSI_ID_MAP, 0); } static void alx_irq_enable(struct alx_priv *alx) { struct alx_hw *hw = &alx->hw; /* level-1 interrupt switch */ alx_write_mem32(hw, ALX_ISR, 0); alx_write_mem32(hw, ALX_IMR, alx->int_mask); alx_post_write(hw); } static void alx_irq_disable(struct alx_priv *alx) { struct alx_hw *hw = &alx->hw; alx_write_mem32(hw, ALX_ISR, ALX_ISR_DIS); alx_write_mem32(hw, ALX_IMR, 0); alx_post_write(hw); synchronize_irq(alx->hw.pdev->irq); } static int alx_request_irq(struct alx_priv *alx) { struct pci_dev *pdev = alx->hw.pdev; struct alx_hw *hw = &alx->hw; int err; u32 msi_ctrl; msi_ctrl = (hw->imt >> 1) << ALX_MSI_RETRANS_TM_SHIFT; if (!pci_enable_msi(alx->hw.pdev)) { alx->msi = true; alx_write_mem32(hw, ALX_MSI_RETRANS_TIMER, msi_ctrl | ALX_MSI_MASK_SEL_LINE); err = request_irq(pdev->irq, alx_intr_msi, 0, alx->dev->name, alx); if (!err) goto out; /* fall back to legacy interrupt */ pci_disable_msi(alx->hw.pdev); } alx_write_mem32(hw, ALX_MSI_RETRANS_TIMER, 0); err = request_irq(pdev->irq, alx_intr_legacy, IRQF_SHARED, alx->dev->name, alx); out: if (!err) alx_config_vector_mapping(alx); return err; } static void alx_free_irq(struct alx_priv *alx) { struct pci_dev *pdev = alx->hw.pdev; free_irq(pdev->irq, alx); if (alx->msi) { pci_disable_msi(alx->hw.pdev); alx->msi = false; } } static int alx_identify_hw(struct alx_priv *alx) { struct alx_hw *hw = &alx->hw; int rev = alx_hw_revision(hw); if (rev > ALX_REV_C0) return -EINVAL; hw->max_dma_chnl = rev >= ALX_REV_B0 ? 4 : 2; return 0; } static int alx_init_sw(struct alx_priv *alx) { struct pci_dev *pdev = alx->hw.pdev; struct alx_hw *hw = &alx->hw; int err; err = alx_identify_hw(alx); if (err) { dev_err(&pdev->dev, "unrecognized chip, aborting\n"); return err; } alx->hw.lnk_patch = pdev->device == ALX_DEV_ID_AR8161 && pdev->subsystem_vendor == PCI_VENDOR_ID_ATTANSIC && pdev->subsystem_device == 0x0091 && pdev->revision == 0; hw->smb_timer = 400; hw->mtu = alx->dev->mtu; alx->rxbuf_size = ALIGN(ALX_RAW_MTU(hw->mtu), 8); alx->tx_ringsz = 256; alx->rx_ringsz = 512; hw->imt = 200; alx->int_mask = ALX_ISR_MISC; hw->dma_chnl = hw->max_dma_chnl; hw->ith_tpd = alx->tx_ringsz / 3; hw->link_speed = SPEED_UNKNOWN; hw->duplex = DUPLEX_UNKNOWN; hw->adv_cfg = ADVERTISED_Autoneg | ADVERTISED_10baseT_Half | ADVERTISED_10baseT_Full | ADVERTISED_100baseT_Full | ADVERTISED_100baseT_Half | ADVERTISED_1000baseT_Full; hw->flowctrl = ALX_FC_ANEG | ALX_FC_RX | ALX_FC_TX; hw->rx_ctrl = ALX_MAC_CTRL_WOLSPED_SWEN | ALX_MAC_CTRL_MHASH_ALG_HI5B | ALX_MAC_CTRL_BRD_EN | ALX_MAC_CTRL_PCRCE | ALX_MAC_CTRL_CRCE | ALX_MAC_CTRL_RXFC_EN | ALX_MAC_CTRL_TXFC_EN | 7 << ALX_MAC_CTRL_PRMBLEN_SHIFT; return err; } static netdev_features_t alx_fix_features(struct net_device *netdev, netdev_features_t features) { if (netdev->mtu > ALX_MAX_TSO_PKT_SIZE) features &= ~(NETIF_F_TSO | NETIF_F_TSO6); return features; } static void alx_netif_stop(struct alx_priv *alx) { alx->dev->trans_start = jiffies; if (netif_carrier_ok(alx->dev)) { netif_carrier_off(alx->dev); netif_tx_disable(alx->dev); napi_disable(&alx->napi); } } static void alx_halt(struct alx_priv *alx) { struct alx_hw *hw = &alx->hw; alx_netif_stop(alx); hw->link_speed = SPEED_UNKNOWN; hw->duplex = DUPLEX_UNKNOWN; alx_reset_mac(hw); /* disable l0s/l1 */ alx_enable_aspm(hw, false, false); alx_irq_disable(alx); alx_free_buffers(alx); } static void alx_configure(struct alx_priv *alx) { struct alx_hw *hw = &alx->hw; alx_configure_basic(hw); alx_disable_rss(hw); __alx_set_rx_mode(alx->dev); alx_write_mem32(hw, ALX_MAC_CTRL, hw->rx_ctrl); } static void alx_activate(struct alx_priv *alx) { /* hardware setting lost, restore it */ alx_reinit_rings(alx); alx_configure(alx); /* clear old interrupts */ alx_write_mem32(&alx->hw, ALX_ISR, ~(u32)ALX_ISR_DIS); alx_irq_enable(alx); alx_schedule_link_check(alx); } static void alx_reinit(struct alx_priv *alx) { ASSERT_RTNL(); alx_halt(alx); alx_activate(alx); } static int alx_change_mtu(struct net_device *netdev, int mtu) { struct alx_priv *alx = netdev_priv(netdev); int max_frame = mtu + ETH_HLEN + ETH_FCS_LEN + VLAN_HLEN; if ((max_frame < ALX_MIN_FRAME_SIZE) || (max_frame > ALX_MAX_FRAME_SIZE)) return -EINVAL; if (netdev->mtu == mtu) return 0; netdev->mtu = mtu; alx->hw.mtu = mtu; alx->rxbuf_size = mtu > ALX_DEF_RXBUF_SIZE ? ALIGN(max_frame, 8) : ALX_DEF_RXBUF_SIZE; netdev_update_features(netdev); if (netif_running(netdev)) alx_reinit(alx); return 0; } static void alx_netif_start(struct alx_priv *alx) { netif_tx_wake_all_queues(alx->dev); napi_enable(&alx->napi); netif_carrier_on(alx->dev); } static int __alx_open(struct alx_priv *alx, bool resume) { int err; if (!resume) netif_carrier_off(alx->dev); err = alx_alloc_rings(alx); if (err) return err; alx_configure(alx); err = alx_request_irq(alx); if (err) goto out_free_rings; /* clear old interrupts */ alx_write_mem32(&alx->hw, ALX_ISR, ~(u32)ALX_ISR_DIS); alx_irq_enable(alx); if (!resume) netif_tx_start_all_queues(alx->dev); alx_schedule_link_check(alx); return 0; out_free_rings: alx_free_rings(alx); return err; } static void __alx_stop(struct alx_priv *alx) { alx_halt(alx); alx_free_irq(alx); alx_free_rings(alx); } static const char *alx_speed_desc(struct alx_hw *hw) { switch (alx_speed_to_ethadv(hw->link_speed, hw->duplex)) { case ADVERTISED_1000baseT_Full: return "1 Gbps Full"; case ADVERTISED_100baseT_Full: return "100 Mbps Full"; case ADVERTISED_100baseT_Half: return "100 Mbps Half"; case ADVERTISED_10baseT_Full: return "10 Mbps Full"; case ADVERTISED_10baseT_Half: return "10 Mbps Half"; default: return "Unknown speed"; } } static void alx_check_link(struct alx_priv *alx) { struct alx_hw *hw = &alx->hw; unsigned long flags; int old_speed; u8 old_duplex; int err; /* clear PHY internal interrupt status, otherwise the main * interrupt status will be asserted forever */ alx_clear_phy_intr(hw); old_speed = hw->link_speed; old_duplex = hw->duplex; err = alx_read_phy_link(hw); if (err < 0) goto reset; spin_lock_irqsave(&alx->irq_lock, flags); alx->int_mask |= ALX_ISR_PHY; alx_write_mem32(hw, ALX_IMR, alx->int_mask); spin_unlock_irqrestore(&alx->irq_lock, flags); if (old_speed == hw->link_speed) return; if (hw->link_speed != SPEED_UNKNOWN) { netif_info(alx, link, alx->dev, "NIC Up: %s\n", alx_speed_desc(hw)); alx_post_phy_link(hw); alx_enable_aspm(hw, true, true); alx_start_mac(hw); if (old_speed == SPEED_UNKNOWN) alx_netif_start(alx); } else { /* link is now down */ alx_netif_stop(alx); netif_info(alx, link, alx->dev, "Link Down\n"); err = alx_reset_mac(hw); if (err) goto reset; alx_irq_disable(alx); /* MAC reset causes all HW settings to be lost, restore all */ err = alx_reinit_rings(alx); if (err) goto reset; alx_configure(alx); alx_enable_aspm(hw, false, true); alx_post_phy_link(hw); alx_irq_enable(alx); } return; reset: alx_schedule_reset(alx); } static int alx_open(struct net_device *netdev) { return __alx_open(netdev_priv(netdev), false); } static int alx_stop(struct net_device *netdev) { __alx_stop(netdev_priv(netdev)); return 0; } static void alx_link_check(struct work_struct *work) { struct alx_priv *alx; alx = container_of(work, struct alx_priv, link_check_wk); rtnl_lock(); alx_check_link(alx); rtnl_unlock(); } static void alx_reset(struct work_struct *work) { struct alx_priv *alx = container_of(work, struct alx_priv, reset_wk); rtnl_lock(); alx_reinit(alx); rtnl_unlock(); } static int alx_tx_csum(struct sk_buff *skb, struct alx_txd *first) { u8 cso, css; if (skb->ip_summed != CHECKSUM_PARTIAL) return 0; cso = skb_checksum_start_offset(skb); if (cso & 1) return -EINVAL; css = cso + skb->csum_offset; first->word1 |= cpu_to_le32((cso >> 1) << TPD_CXSUMSTART_SHIFT); first->word1 |= cpu_to_le32((css >> 1) << TPD_CXSUMOFFSET_SHIFT); first->word1 |= cpu_to_le32(1 << TPD_CXSUM_EN_SHIFT); return 0; } static int alx_map_tx_skb(struct alx_priv *alx, struct sk_buff *skb) { struct alx_tx_queue *txq = &alx->txq; struct alx_txd *tpd, *first_tpd; dma_addr_t dma; int maplen, f, first_idx = txq->write_idx; first_tpd = &txq->tpd[txq->write_idx]; tpd = first_tpd; maplen = skb_headlen(skb); dma = dma_map_single(&alx->hw.pdev->dev, skb->data, maplen, DMA_TO_DEVICE); if (dma_mapping_error(&alx->hw.pdev->dev, dma)) goto err_dma; dma_unmap_len_set(&txq->bufs[txq->write_idx], size, maplen); dma_unmap_addr_set(&txq->bufs[txq->write_idx], dma, dma); tpd->adrl.addr = cpu_to_le64(dma); tpd->len = cpu_to_le16(maplen); for (f = 0; f < skb_shinfo(skb)->nr_frags; f++) { struct skb_frag_struct *frag; frag = &skb_shinfo(skb)->frags[f]; if (++txq->write_idx == alx->tx_ringsz) txq->write_idx = 0; tpd = &txq->tpd[txq->write_idx]; tpd->word1 = first_tpd->word1; maplen = skb_frag_size(frag); dma = skb_frag_dma_map(&alx->hw.pdev->dev, frag, 0, maplen, DMA_TO_DEVICE); if (dma_mapping_error(&alx->hw.pdev->dev, dma)) goto err_dma; dma_unmap_len_set(&txq->bufs[txq->write_idx], size, maplen); dma_unmap_addr_set(&txq->bufs[txq->write_idx], dma, dma); tpd->adrl.addr = cpu_to_le64(dma); tpd->len = cpu_to_le16(maplen); } /* last TPD, set EOP flag and store skb */ tpd->word1 |= cpu_to_le32(1 << TPD_EOP_SHIFT); txq->bufs[txq->write_idx].skb = skb; if (++txq->write_idx == alx->tx_ringsz) txq->write_idx = 0; return 0; err_dma: f = first_idx; while (f != txq->write_idx) { alx_free_txbuf(alx, f); if (++f == alx->tx_ringsz) f = 0; } return -ENOMEM; } static netdev_tx_t alx_start_xmit(struct sk_buff *skb, struct net_device *netdev) { struct alx_priv *alx = netdev_priv(netdev); struct alx_tx_queue *txq = &alx->txq; struct alx_txd *first; int tpdreq = skb_shinfo(skb)->nr_frags + 1; if (alx_tpd_avail(alx) < tpdreq) { netif_stop_queue(alx->dev); goto drop; } first = &txq->tpd[txq->write_idx]; memset(first, 0, sizeof(*first)); if (alx_tx_csum(skb, first)) goto drop; if (alx_map_tx_skb(alx, skb) < 0) goto drop; netdev_sent_queue(alx->dev, skb->len); /* flush updates before updating hardware */ wmb(); alx_write_mem16(&alx->hw, ALX_TPD_PRI0_PIDX, txq->write_idx); if (alx_tpd_avail(alx) < alx->tx_ringsz/8) netif_stop_queue(alx->dev); return NETDEV_TX_OK; drop: dev_kfree_skb_any(skb); return NETDEV_TX_OK; } static void alx_tx_timeout(struct net_device *dev) { struct alx_priv *alx = netdev_priv(dev); alx_schedule_reset(alx); } static int alx_mdio_read(struct net_device *netdev, int prtad, int devad, u16 addr) { struct alx_priv *alx = netdev_priv(netdev); struct alx_hw *hw = &alx->hw; u16 val; int err; if (prtad != hw->mdio.prtad) return -EINVAL; if (devad == MDIO_DEVAD_NONE) err = alx_read_phy_reg(hw, addr, &val); else err = alx_read_phy_ext(hw, devad, addr, &val); if (err) return err; return val; } static int alx_mdio_write(struct net_device *netdev, int prtad, int devad, u16 addr, u16 val) { struct alx_priv *alx = netdev_priv(netdev); struct alx_hw *hw = &alx->hw; if (prtad != hw->mdio.prtad) return -EINVAL; if (devad == MDIO_DEVAD_NONE) return alx_write_phy_reg(hw, addr, val); return alx_write_phy_ext(hw, devad, addr, val); } static int alx_ioctl(struct net_device *netdev, struct ifreq *ifr, int cmd) { struct alx_priv *alx = netdev_priv(netdev); if (!netif_running(netdev)) return -EAGAIN; return mdio_mii_ioctl(&alx->hw.mdio, if_mii(ifr), cmd); } #ifdef CONFIG_NET_POLL_CONTROLLER static void alx_poll_controller(struct net_device *netdev) { struct alx_priv *alx = netdev_priv(netdev); if (alx->msi) alx_intr_msi(0, alx); else alx_intr_legacy(0, alx); } #endif static struct rtnl_link_stats64 *alx_get_stats64(struct net_device *dev, struct rtnl_link_stats64 *net_stats) { struct alx_priv *alx = netdev_priv(dev); struct alx_hw_stats *hw_stats = &alx->hw.stats; spin_lock(&alx->stats_lock); alx_update_hw_stats(&alx->hw); net_stats->tx_bytes = hw_stats->tx_byte_cnt; net_stats->rx_bytes = hw_stats->rx_byte_cnt; net_stats->multicast = hw_stats->rx_mcast; net_stats->collisions = hw_stats->tx_single_col + hw_stats->tx_multi_col + hw_stats->tx_late_col + hw_stats->tx_abort_col; net_stats->rx_errors = hw_stats->rx_frag + hw_stats->rx_fcs_err + hw_stats->rx_len_err + hw_stats->rx_ov_sz + hw_stats->rx_ov_rrd + hw_stats->rx_align_err + hw_stats->rx_ov_rxf; net_stats->rx_fifo_errors = hw_stats->rx_ov_rxf; net_stats->rx_length_errors = hw_stats->rx_len_err; net_stats->rx_crc_errors = hw_stats->rx_fcs_err; net_stats->rx_frame_errors = hw_stats->rx_align_err; net_stats->rx_dropped = hw_stats->rx_ov_rrd; net_stats->tx_errors = hw_stats->tx_late_col + hw_stats->tx_abort_col + hw_stats->tx_underrun + hw_stats->tx_trunc; net_stats->tx_aborted_errors = hw_stats->tx_abort_col; net_stats->tx_fifo_errors = hw_stats->tx_underrun; net_stats->tx_window_errors = hw_stats->tx_late_col; net_stats->tx_packets = hw_stats->tx_ok + net_stats->tx_errors; net_stats->rx_packets = hw_stats->rx_ok + net_stats->rx_errors; spin_unlock(&alx->stats_lock); return net_stats; } static const struct net_device_ops alx_netdev_ops = { .ndo_open = alx_open, .ndo_stop = alx_stop, .ndo_start_xmit = alx_start_xmit, .ndo_get_stats64 = alx_get_stats64, .ndo_set_rx_mode = alx_set_rx_mode, .ndo_validate_addr = eth_validate_addr, .ndo_set_mac_address = alx_set_mac_address, .ndo_change_mtu = alx_change_mtu, .ndo_do_ioctl = alx_ioctl, .ndo_tx_timeout = alx_tx_timeout, .ndo_fix_features = alx_fix_features, #ifdef CONFIG_NET_POLL_CONTROLLER .ndo_poll_controller = alx_poll_controller, #endif }; static int alx_probe(struct pci_dev *pdev, const struct pci_device_id *ent) { struct net_device *netdev; struct alx_priv *alx; struct alx_hw *hw; bool phy_configured; int bars, err; err = pci_enable_device_mem(pdev); if (err) return err; /* The alx chip can DMA to 64-bit addresses, but it uses a single * shared register for the high 32 bits, so only a single, aligned, * 4 GB physical address range can be used for descriptors. */ if (!dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(64))) { dev_dbg(&pdev->dev, "DMA to 64-BIT addresses\n"); } else { err = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32)); if (err) { dev_err(&pdev->dev, "No usable DMA config, aborting\n"); goto out_pci_disable; } } bars = pci_select_bars(pdev, IORESOURCE_MEM); err = pci_request_selected_regions(pdev, bars, alx_drv_name); if (err) { dev_err(&pdev->dev, "pci_request_selected_regions failed(bars:%d)\n", bars); goto out_pci_disable; } pci_enable_pcie_error_reporting(pdev); pci_set_master(pdev); if (!pdev->pm_cap) { dev_err(&pdev->dev, "Can't find power management capability, aborting\n"); err = -EIO; goto out_pci_release; } netdev = alloc_etherdev(sizeof(*alx)); if (!netdev) { err = -ENOMEM; goto out_pci_release; } SET_NETDEV_DEV(netdev, &pdev->dev); alx = netdev_priv(netdev); spin_lock_init(&alx->hw.mdio_lock); spin_lock_init(&alx->irq_lock); spin_lock_init(&alx->stats_lock); alx->dev = netdev; alx->hw.pdev = pdev; alx->msg_enable = NETIF_MSG_LINK | NETIF_MSG_HW | NETIF_MSG_IFUP | NETIF_MSG_TX_ERR | NETIF_MSG_RX_ERR | NETIF_MSG_WOL; hw = &alx->hw; pci_set_drvdata(pdev, alx); hw->hw_addr = pci_ioremap_bar(pdev, 0); if (!hw->hw_addr) { dev_err(&pdev->dev, "cannot map device registers\n"); err = -EIO; goto out_free_netdev; } netdev->netdev_ops = &alx_netdev_ops; netdev->ethtool_ops = &alx_ethtool_ops; netdev->irq = pdev->irq; netdev->watchdog_timeo = ALX_WATCHDOG_TIME; if (ent->driver_data & ALX_DEV_QUIRK_MSI_INTX_DISABLE_BUG) pdev->dev_flags |= PCI_DEV_FLAGS_MSI_INTX_DISABLE_BUG; err = alx_init_sw(alx); if (err) { dev_err(&pdev->dev, "net device private data init failed\n"); goto out_unmap; } alx_reset_pcie(hw); phy_configured = alx_phy_configured(hw); if (!phy_configured) alx_reset_phy(hw); err = alx_reset_mac(hw); if (err) { dev_err(&pdev->dev, "MAC Reset failed, error = %d\n", err); goto out_unmap; } /* setup link to put it in a known good starting state */ if (!phy_configured) { err = alx_setup_speed_duplex(hw, hw->adv_cfg, hw->flowctrl); if (err) { dev_err(&pdev->dev, "failed to configure PHY speed/duplex (err=%d)\n", err); goto out_unmap; } } netdev->hw_features = NETIF_F_SG | NETIF_F_HW_CSUM; if (alx_get_perm_macaddr(hw, hw->perm_addr)) { dev_warn(&pdev->dev, "Invalid permanent address programmed, using random one\n"); eth_hw_addr_random(netdev); memcpy(hw->perm_addr, netdev->dev_addr, netdev->addr_len); } memcpy(hw->mac_addr, hw->perm_addr, ETH_ALEN); memcpy(netdev->dev_addr, hw->mac_addr, ETH_ALEN); memcpy(netdev->perm_addr, hw->perm_addr, ETH_ALEN); hw->mdio.prtad = 0; hw->mdio.mmds = 0; hw->mdio.dev = netdev; hw->mdio.mode_support = MDIO_SUPPORTS_C45 | MDIO_SUPPORTS_C22 | MDIO_EMULATE_C22; hw->mdio.mdio_read = alx_mdio_read; hw->mdio.mdio_write = alx_mdio_write; if (!alx_get_phy_info(hw)) { dev_err(&pdev->dev, "failed to identify PHY\n"); err = -EIO; goto out_unmap; } INIT_WORK(&alx->link_check_wk, alx_link_check); INIT_WORK(&alx->reset_wk, alx_reset); netif_carrier_off(netdev); err = register_netdev(netdev); if (err) { dev_err(&pdev->dev, "register netdevice failed\n"); goto out_unmap; } netdev_info(netdev, "Qualcomm Atheros AR816x/AR817x Ethernet [%pM]\n", netdev->dev_addr); return 0; out_unmap: iounmap(hw->hw_addr); out_free_netdev: free_netdev(netdev); out_pci_release: pci_release_selected_regions(pdev, bars); out_pci_disable: pci_disable_device(pdev); return err; } static void alx_remove(struct pci_dev *pdev) { struct alx_priv *alx = pci_get_drvdata(pdev); struct alx_hw *hw = &alx->hw; cancel_work_sync(&alx->link_check_wk); cancel_work_sync(&alx->reset_wk); /* restore permanent mac address */ alx_set_macaddr(hw, hw->perm_addr); unregister_netdev(alx->dev); iounmap(hw->hw_addr); pci_release_selected_regions(pdev, pci_select_bars(pdev, IORESOURCE_MEM)); pci_disable_pcie_error_reporting(pdev); pci_disable_device(pdev); free_netdev(alx->dev); } #ifdef CONFIG_PM_SLEEP static int alx_suspend(struct device *dev) { struct pci_dev *pdev = to_pci_dev(dev); struct alx_priv *alx = pci_get_drvdata(pdev); if (!netif_running(alx->dev)) return 0; netif_device_detach(alx->dev); __alx_stop(alx); return 0; } static int alx_resume(struct device *dev) { struct pci_dev *pdev = to_pci_dev(dev); struct alx_priv *alx = pci_get_drvdata(pdev); struct alx_hw *hw = &alx->hw; alx_reset_phy(hw); if (!netif_running(alx->dev)) return 0; netif_device_attach(alx->dev); return __alx_open(alx, true); } static SIMPLE_DEV_PM_OPS(alx_pm_ops, alx_suspend, alx_resume); #define ALX_PM_OPS (&alx_pm_ops) #else #define ALX_PM_OPS NULL #endif static pci_ers_result_t alx_pci_error_detected(struct pci_dev *pdev, pci_channel_state_t state) { struct alx_priv *alx = pci_get_drvdata(pdev); struct net_device *netdev = alx->dev; pci_ers_result_t rc = PCI_ERS_RESULT_NEED_RESET; dev_info(&pdev->dev, "pci error detected\n"); rtnl_lock(); if (netif_running(netdev)) { netif_device_detach(netdev); alx_halt(alx); } if (state == pci_channel_io_perm_failure) rc = PCI_ERS_RESULT_DISCONNECT; else pci_disable_device(pdev); rtnl_unlock(); return rc; } static pci_ers_result_t alx_pci_error_slot_reset(struct pci_dev *pdev) { struct alx_priv *alx = pci_get_drvdata(pdev); struct alx_hw *hw = &alx->hw; pci_ers_result_t rc = PCI_ERS_RESULT_DISCONNECT; dev_info(&pdev->dev, "pci error slot reset\n"); rtnl_lock(); if (pci_enable_device(pdev)) { dev_err(&pdev->dev, "Failed to re-enable PCI device after reset\n"); goto out; } pci_set_master(pdev); alx_reset_pcie(hw); if (!alx_reset_mac(hw)) rc = PCI_ERS_RESULT_RECOVERED; out: pci_cleanup_aer_uncorrect_error_status(pdev); rtnl_unlock(); return rc; } static void alx_pci_error_resume(struct pci_dev *pdev) { struct alx_priv *alx = pci_get_drvdata(pdev); struct net_device *netdev = alx->dev; dev_info(&pdev->dev, "pci error resume\n"); rtnl_lock(); if (netif_running(netdev)) { alx_activate(alx); netif_device_attach(netdev); } rtnl_unlock(); } static const struct pci_error_handlers alx_err_handlers = { .error_detected = alx_pci_error_detected, .slot_reset = alx_pci_error_slot_reset, .resume = alx_pci_error_resume, }; static DEFINE_PCI_DEVICE_TABLE(alx_pci_tbl) = { { PCI_VDEVICE(ATTANSIC, ALX_DEV_ID_AR8161), .driver_data = ALX_DEV_QUIRK_MSI_INTX_DISABLE_BUG }, { PCI_VDEVICE(ATTANSIC, ALX_DEV_ID_E2200), .driver_data = ALX_DEV_QUIRK_MSI_INTX_DISABLE_BUG }, { PCI_VDEVICE(ATTANSIC, ALX_DEV_ID_AR8162), .driver_data = ALX_DEV_QUIRK_MSI_INTX_DISABLE_BUG }, { PCI_VDEVICE(ATTANSIC, ALX_DEV_ID_AR8171) }, { PCI_VDEVICE(ATTANSIC, ALX_DEV_ID_AR8172) }, {} }; static struct pci_driver alx_driver = { .name = alx_drv_name, .id_table = alx_pci_tbl, .probe = alx_probe, .remove = alx_remove, .err_handler = &alx_err_handlers, .driver.pm = ALX_PM_OPS, }; module_pci_driver(alx_driver); MODULE_DEVICE_TABLE(pci, alx_pci_tbl); MODULE_AUTHOR("Johannes Berg "); MODULE_AUTHOR("Qualcomm Corporation, "); MODULE_DESCRIPTION( "Qualcomm Atheros(R) AR816x/AR817x PCI-E Ethernet Network Driver"); MODULE_LICENSE("GPL");