diff options
Diffstat (limited to 'drivers/net/ethernet/atheros/alx/main.c')
| -rw-r--r-- | drivers/net/ethernet/atheros/alx/main.c | 2067 |
1 files changed, 2067 insertions, 0 deletions
diff --git a/drivers/net/ethernet/atheros/alx/main.c b/drivers/net/ethernet/atheros/alx/main.c new file mode 100644 index 000000000..d30d11872 --- /dev/null +++ b/drivers/net/ethernet/atheros/alx/main.c @@ -0,0 +1,2067 @@ +/* + * Copyright (c) 2013, 2021 Johannes Berg <johannes@sipsolutions.net> + * + * 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 <http://www.gnu.org/licenses/>. + * + * 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 <linux/module.h> +#include <linux/pci.h> +#include <linux/interrupt.h> +#include <linux/ip.h> +#include <linux/ipv6.h> +#include <linux/if_vlan.h> +#include <linux/mdio.h> +#include <linux/aer.h> +#include <linux/bitops.h> +#include <linux/netdevice.h> +#include <linux/etherdevice.h> +#include <net/ip6_checksum.h> +#include <linux/crc32.h> +#include "alx.h" +#include "hw.h" +#include "reg.h" + +static const char alx_drv_name[] = "alx"; + +static void alx_free_txbuf(struct alx_tx_queue *txq, int entry) +{ + struct alx_buffer *txb = &txq->bufs[entry]; + + if (dma_unmap_len(txb, size)) { + dma_unmap_single(txq->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->qnapi[0]->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]; + + /* + * When DMA RX address is set to something like + * 0x....fc0, it will be very likely to cause DMA + * RFD overflow issue. + * + * To work around it, we apply rx skb with 64 bytes + * longer space, and offset the address whenever + * 0x....fc0 is detected. + */ + skb = __netdev_alloc_skb(alx->dev, alx->rxbuf_size + 64, gfp); + if (!skb) + break; + + if (((unsigned long)skb->data & 0xfff) == 0xfc0) + skb_reserve(skb, 64); + + 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 struct alx_tx_queue *alx_tx_queue_mapping(struct alx_priv *alx, + struct sk_buff *skb) +{ + unsigned int r_idx = skb->queue_mapping; + + if (r_idx >= alx->num_txq) + r_idx = r_idx % alx->num_txq; + + return alx->qnapi[r_idx]->txq; +} + +static struct netdev_queue *alx_get_tx_queue(const struct alx_tx_queue *txq) +{ + return netdev_get_tx_queue(txq->netdev, txq->queue_idx); +} + +static inline int alx_tpd_avail(struct alx_tx_queue *txq) +{ + if (txq->write_idx >= txq->read_idx) + return txq->count + txq->read_idx - txq->write_idx - 1; + return txq->read_idx - txq->write_idx - 1; +} + +static bool alx_clean_tx_irq(struct alx_tx_queue *txq) +{ + struct alx_priv *alx; + struct netdev_queue *tx_queue; + u16 hw_read_idx, sw_read_idx; + unsigned int total_bytes = 0, total_packets = 0; + int budget = ALX_DEFAULT_TX_WORK; + + alx = netdev_priv(txq->netdev); + tx_queue = alx_get_tx_queue(txq); + + sw_read_idx = txq->read_idx; + hw_read_idx = alx_read_mem16(&alx->hw, txq->c_reg); + + 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(txq, sw_read_idx); + + if (++sw_read_idx == txq->count) + sw_read_idx = 0; + } + txq->read_idx = sw_read_idx; + + netdev_tx_completed_queue(tx_queue, total_packets, total_bytes); + } + + if (netif_tx_queue_stopped(tx_queue) && netif_carrier_ok(alx->dev) && + alx_tpd_avail(txq) > txq->count / 4) + netif_tx_wake_queue(tx_queue); + + 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 int alx_clean_rx_irq(struct alx_rx_queue *rxq, int budget) +{ + struct alx_priv *alx; + struct alx_rrd *rrd; + struct alx_buffer *rxb; + struct sk_buff *skb; + u16 length, rfd_cleaned = 0; + int work = 0; + + alx = netdev_priv(rxq->netdev); + + while (work < budget) { + 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 work; + } + + rxb = &rxq->bufs[rxq->read_idx]; + dma_unmap_single(rxq->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, rxq->netdev); + + 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(&rxq->np->napi, skb); + work++; + +next_pkt: + if (++rxq->read_idx == rxq->count) + rxq->read_idx = 0; + if (++rxq->rrd_read_idx == rxq->count) + 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 work; +} + +static int alx_poll(struct napi_struct *napi, int budget) +{ + struct alx_napi *np = container_of(napi, struct alx_napi, napi); + struct alx_priv *alx = np->alx; + struct alx_hw *hw = &alx->hw; + unsigned long flags; + bool tx_complete = true; + int work = 0; + + if (np->txq) + tx_complete = alx_clean_tx_irq(np->txq); + if (np->rxq) + work = alx_clean_rx_irq(np->rxq, budget); + + if (!tx_complete || work == budget) + return budget; + + napi_complete_done(&np->napi, work); + + /* enable interrupt */ + if (alx->hw.pdev->msix_enabled) { + alx_mask_msix(hw, np->vec_idx, false); + } else { + 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 work; +} + +static bool alx_intr_handle_misc(struct alx_priv *alx, u32 intr) +{ + struct alx_hw *hw = &alx->hw; + + if (intr & ALX_ISR_FATAL) { + netif_warn(alx, hw, alx->dev, + "fatal interrupt 0x%x, resetting\n", intr); + alx_schedule_reset(alx); + return true; + } + + 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; + alx_write_mem32(hw, ALX_IMR, alx->int_mask); + alx_schedule_link_check(alx); + } + + return false; +} + +static irqreturn_t alx_intr_handle(struct alx_priv *alx, u32 intr) +{ + struct alx_hw *hw = &alx->hw; + + spin_lock(&alx->irq_lock); + + /* ACK interrupt */ + alx_write_mem32(hw, ALX_ISR, intr | ALX_ISR_DIS); + intr &= alx->int_mask; + + if (alx_intr_handle_misc(alx, intr)) + goto out; + + if (intr & (ALX_ISR_TX_Q0 | ALX_ISR_RX_Q0)) { + napi_schedule(&alx->qnapi[0]->napi); + /* mask rx/tx interrupt, enable them when napi complete */ + alx->int_mask &= ~ALX_ISR_ALL_QUEUES; + 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_msix_ring(int irq, void *data) +{ + struct alx_napi *np = data; + struct alx_hw *hw = &np->alx->hw; + + /* mask interrupt to ACK chip */ + alx_mask_msix(hw, np->vec_idx, true); + /* clear interrupt status */ + alx_write_mem32(hw, ALX_ISR, np->vec_mask); + + napi_schedule(&np->napi); + + return IRQ_HANDLED; +} + +static irqreturn_t alx_intr_msix_misc(int irq, void *data) +{ + struct alx_priv *alx = data; + struct alx_hw *hw = &alx->hw; + u32 intr; + + /* mask interrupt to ACK chip */ + alx_mask_msix(hw, 0, true); + + /* read interrupt status */ + intr = alx_read_mem32(hw, ALX_ISR); + intr &= (alx->int_mask & ~ALX_ISR_ALL_QUEUES); + + if (alx_intr_handle_misc(alx, intr)) + return IRQ_HANDLED; + + /* clear interrupt status */ + alx_write_mem32(hw, ALX_ISR, intr); + + /* enable interrupt again */ + alx_mask_msix(hw, 0, false); + + 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 const u16 txring_header_reg[] = {ALX_TPD_PRI0_ADDR_LO, + ALX_TPD_PRI1_ADDR_LO, + ALX_TPD_PRI2_ADDR_LO, + ALX_TPD_PRI3_ADDR_LO}; + +static void alx_init_ring_ptrs(struct alx_priv *alx) +{ + struct alx_hw *hw = &alx->hw; + u32 addr_hi = ((u64)alx->descmem.dma) >> 32; + struct alx_napi *np; + int i; + + for (i = 0; i < alx->num_napi; i++) { + np = alx->qnapi[i]; + if (np->txq) { + np->txq->read_idx = 0; + np->txq->write_idx = 0; + alx_write_mem32(hw, + txring_header_reg[np->txq->queue_idx], + np->txq->tpd_dma); + } + + if (np->rxq) { + np->rxq->read_idx = 0; + np->rxq->write_idx = 0; + np->rxq->rrd_read_idx = 0; + alx_write_mem32(hw, ALX_RRD_ADDR_LO, np->rxq->rrd_dma); + alx_write_mem32(hw, ALX_RFD_ADDR_LO, np->rxq->rfd_dma); + } + } + + alx_write_mem32(hw, ALX_TX_BASE_ADDR_HI, addr_hi); + alx_write_mem32(hw, ALX_TPD_RING_SZ, alx->tx_ringsz); + + alx_write_mem32(hw, ALX_RX_BASE_ADDR_HI, addr_hi); + alx_write_mem32(hw, ALX_RRD_RING_SZ, alx->rx_ringsz); + alx_write_mem32(hw, ALX_RFD_RING_SZ, alx->rx_ringsz); + alx_write_mem32(hw, ALX_RFD_BUF_SZ, alx->rxbuf_size); + + /* load these pointers into the chip */ + alx_write_mem32(hw, ALX_SRAM9, ALX_SRAM_LOAD_PTR); +} + +static void alx_free_txring_buf(struct alx_tx_queue *txq) +{ + int i; + + if (!txq->bufs) + return; + + for (i = 0; i < txq->count; i++) + alx_free_txbuf(txq, i); + + memset(txq->bufs, 0, txq->count * sizeof(struct alx_buffer)); + memset(txq->tpd, 0, txq->count * sizeof(struct alx_txd)); + txq->write_idx = 0; + txq->read_idx = 0; + + netdev_tx_reset_queue(alx_get_tx_queue(txq)); +} + +static void alx_free_rxring_buf(struct alx_rx_queue *rxq) +{ + struct alx_buffer *cur_buf; + u16 i; + + if (!rxq->bufs) + return; + + for (i = 0; i < rxq->count; i++) { + cur_buf = rxq->bufs + i; + if (cur_buf->skb) { + dma_unmap_single(rxq->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) +{ + int i; + + for (i = 0; i < alx->num_txq; i++) + if (alx->qnapi[i] && alx->qnapi[i]->txq) + alx_free_txring_buf(alx->qnapi[i]->txq); + + if (alx->qnapi[0] && alx->qnapi[0]->rxq) + alx_free_rxring_buf(alx->qnapi[0]->rxq); +} + +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; + + eth_hw_addr_set(netdev, addr->sa_data); + memcpy(hw->mac_addr, addr->sa_data, netdev->addr_len); + alx_set_macaddr(hw, hw->mac_addr); + + return 0; +} + +static int alx_alloc_tx_ring(struct alx_priv *alx, struct alx_tx_queue *txq, + int offset) +{ + txq->bufs = kcalloc(txq->count, sizeof(struct alx_buffer), GFP_KERNEL); + if (!txq->bufs) + return -ENOMEM; + + txq->tpd = alx->descmem.virt + offset; + txq->tpd_dma = alx->descmem.dma + offset; + offset += sizeof(struct alx_txd) * txq->count; + + return offset; +} + +static int alx_alloc_rx_ring(struct alx_priv *alx, struct alx_rx_queue *rxq, + int offset) +{ + rxq->bufs = kcalloc(rxq->count, sizeof(struct alx_buffer), GFP_KERNEL); + if (!rxq->bufs) + return -ENOMEM; + + rxq->rrd = alx->descmem.virt + offset; + rxq->rrd_dma = alx->descmem.dma + offset; + offset += sizeof(struct alx_rrd) * rxq->count; + + rxq->rfd = alx->descmem.virt + offset; + rxq->rfd_dma = alx->descmem.dma + offset; + offset += sizeof(struct alx_rfd) * rxq->count; + + return offset; +} + +static int alx_alloc_rings(struct alx_priv *alx) +{ + int i, offset = 0; + + /* 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 * + alx->num_txq + + sizeof(struct alx_rrd) * alx->rx_ringsz + + sizeof(struct alx_rfd) * alx->rx_ringsz; + alx->descmem.virt = dma_alloc_coherent(&alx->hw.pdev->dev, + alx->descmem.size, + &alx->descmem.dma, GFP_KERNEL); + if (!alx->descmem.virt) + return -ENOMEM; + + /* alignment requirements */ + BUILD_BUG_ON(sizeof(struct alx_txd) % 8); + BUILD_BUG_ON(sizeof(struct alx_rrd) % 8); + + for (i = 0; i < alx->num_txq; i++) { + offset = alx_alloc_tx_ring(alx, alx->qnapi[i]->txq, offset); + if (offset < 0) { + netdev_err(alx->dev, "Allocation of tx buffer failed!\n"); + return -ENOMEM; + } + } + + offset = alx_alloc_rx_ring(alx, alx->qnapi[0]->rxq, offset); + if (offset < 0) { + netdev_err(alx->dev, "Allocation of rx buffer failed!\n"); + return -ENOMEM; + } + + return 0; +} + +static void alx_free_rings(struct alx_priv *alx) +{ + int i; + + alx_free_buffers(alx); + + for (i = 0; i < alx->num_txq; i++) + if (alx->qnapi[i] && alx->qnapi[i]->txq) + kfree(alx->qnapi[i]->txq->bufs); + + if (alx->qnapi[0] && alx->qnapi[0]->rxq) + kfree(alx->qnapi[0]->rxq->bufs); + + if (alx->descmem.virt) + dma_free_coherent(&alx->hw.pdev->dev, + alx->descmem.size, + alx->descmem.virt, + alx->descmem.dma); +} + +static void alx_free_napis(struct alx_priv *alx) +{ + struct alx_napi *np; + int i; + + for (i = 0; i < alx->num_napi; i++) { + np = alx->qnapi[i]; + if (!np) + continue; + + netif_napi_del(&np->napi); + kfree(np->txq); + kfree(np->rxq); + kfree(np); + alx->qnapi[i] = NULL; + } +} + +static const u16 tx_pidx_reg[] = {ALX_TPD_PRI0_PIDX, ALX_TPD_PRI1_PIDX, + ALX_TPD_PRI2_PIDX, ALX_TPD_PRI3_PIDX}; +static const u16 tx_cidx_reg[] = {ALX_TPD_PRI0_CIDX, ALX_TPD_PRI1_CIDX, + ALX_TPD_PRI2_CIDX, ALX_TPD_PRI3_CIDX}; +static const u32 tx_vect_mask[] = {ALX_ISR_TX_Q0, ALX_ISR_TX_Q1, + ALX_ISR_TX_Q2, ALX_ISR_TX_Q3}; +static const u32 rx_vect_mask[] = {ALX_ISR_RX_Q0, ALX_ISR_RX_Q1, + ALX_ISR_RX_Q2, ALX_ISR_RX_Q3, + ALX_ISR_RX_Q4, ALX_ISR_RX_Q5, + ALX_ISR_RX_Q6, ALX_ISR_RX_Q7}; + +static int alx_alloc_napis(struct alx_priv *alx) +{ + struct alx_napi *np; + struct alx_rx_queue *rxq; + struct alx_tx_queue *txq; + int i; + + alx->int_mask &= ~ALX_ISR_ALL_QUEUES; + + /* allocate alx_napi structures */ + for (i = 0; i < alx->num_napi; i++) { + np = kzalloc(sizeof(struct alx_napi), GFP_KERNEL); + if (!np) + goto err_out; + + np->alx = alx; + netif_napi_add(alx->dev, &np->napi, alx_poll); + alx->qnapi[i] = np; + } + + /* allocate tx queues */ + for (i = 0; i < alx->num_txq; i++) { + np = alx->qnapi[i]; + txq = kzalloc(sizeof(*txq), GFP_KERNEL); + if (!txq) + goto err_out; + + np->txq = txq; + txq->p_reg = tx_pidx_reg[i]; + txq->c_reg = tx_cidx_reg[i]; + txq->queue_idx = i; + txq->count = alx->tx_ringsz; + txq->netdev = alx->dev; + txq->dev = &alx->hw.pdev->dev; + np->vec_mask |= tx_vect_mask[i]; + alx->int_mask |= tx_vect_mask[i]; + } + + /* allocate rx queues */ + np = alx->qnapi[0]; + rxq = kzalloc(sizeof(*rxq), GFP_KERNEL); + if (!rxq) + goto err_out; + + np->rxq = rxq; + rxq->np = alx->qnapi[0]; + rxq->queue_idx = 0; + rxq->count = alx->rx_ringsz; + rxq->netdev = alx->dev; + rxq->dev = &alx->hw.pdev->dev; + np->vec_mask |= rx_vect_mask[0]; + alx->int_mask |= rx_vect_mask[0]; + + return 0; + +err_out: + netdev_err(alx->dev, "error allocating internal structures\n"); + alx_free_napis(alx); + return -ENOMEM; +} + +static const int txq_vec_mapping_shift[] = { + 0, ALX_MSI_MAP_TBL1_TXQ0_SHIFT, + 0, ALX_MSI_MAP_TBL1_TXQ1_SHIFT, + 1, ALX_MSI_MAP_TBL2_TXQ2_SHIFT, + 1, ALX_MSI_MAP_TBL2_TXQ3_SHIFT, +}; + +static void alx_config_vector_mapping(struct alx_priv *alx) +{ + struct alx_hw *hw = &alx->hw; + u32 tbl[2] = {0, 0}; + int i, vector, idx, shift; + + if (alx->hw.pdev->msix_enabled) { + /* tx mappings */ + for (i = 0, vector = 1; i < alx->num_txq; i++, vector++) { + idx = txq_vec_mapping_shift[i * 2]; + shift = txq_vec_mapping_shift[i * 2 + 1]; + tbl[idx] |= vector << shift; + } + + /* rx mapping */ + tbl[0] |= 1 << ALX_MSI_MAP_TBL1_RXQ0_SHIFT; + } + + alx_write_mem32(hw, ALX_MSI_MAP_TBL1, tbl[0]); + alx_write_mem32(hw, ALX_MSI_MAP_TBL2, tbl[1]); + alx_write_mem32(hw, ALX_MSI_ID_MAP, 0); +} + +static int alx_enable_msix(struct alx_priv *alx) +{ + int err, num_vec, num_txq, num_rxq; + + num_txq = min_t(int, num_online_cpus(), ALX_MAX_TX_QUEUES); + num_rxq = 1; + num_vec = max_t(int, num_txq, num_rxq) + 1; + + err = pci_alloc_irq_vectors(alx->hw.pdev, num_vec, num_vec, + PCI_IRQ_MSIX); + if (err < 0) { + netdev_warn(alx->dev, "Enabling MSI-X interrupts failed!\n"); + return err; + } + + alx->num_vec = num_vec; + alx->num_napi = num_vec - 1; + alx->num_txq = num_txq; + alx->num_rxq = num_rxq; + + return err; +} + +static int alx_request_msix(struct alx_priv *alx) +{ + struct net_device *netdev = alx->dev; + int i, err, vector = 0, free_vector = 0; + + err = request_irq(pci_irq_vector(alx->hw.pdev, 0), alx_intr_msix_misc, + 0, netdev->name, alx); + if (err) + goto out_err; + + for (i = 0; i < alx->num_napi; i++) { + struct alx_napi *np = alx->qnapi[i]; + + vector++; + + if (np->txq && np->rxq) + sprintf(np->irq_lbl, "%s-TxRx-%u", netdev->name, + np->txq->queue_idx); + else if (np->txq) + sprintf(np->irq_lbl, "%s-tx-%u", netdev->name, + np->txq->queue_idx); + else if (np->rxq) + sprintf(np->irq_lbl, "%s-rx-%u", netdev->name, + np->rxq->queue_idx); + else + sprintf(np->irq_lbl, "%s-unused", netdev->name); + + np->vec_idx = vector; + err = request_irq(pci_irq_vector(alx->hw.pdev, vector), + alx_intr_msix_ring, 0, np->irq_lbl, np); + if (err) + goto out_free; + } + return 0; + +out_free: + free_irq(pci_irq_vector(alx->hw.pdev, free_vector++), alx); + + vector--; + for (i = 0; i < vector; i++) + free_irq(pci_irq_vector(alx->hw.pdev,free_vector++), + alx->qnapi[i]); + +out_err: + return err; +} + +static int alx_init_intr(struct alx_priv *alx) +{ + int ret; + + ret = pci_alloc_irq_vectors(alx->hw.pdev, 1, 1, + PCI_IRQ_MSI | PCI_IRQ_LEGACY); + if (ret < 0) + return ret; + + alx->num_vec = 1; + alx->num_napi = 1; + alx->num_txq = 1; + alx->num_rxq = 1; + return 0; +} + +static void alx_irq_enable(struct alx_priv *alx) +{ + struct alx_hw *hw = &alx->hw; + int i; + + /* level-1 interrupt switch */ + alx_write_mem32(hw, ALX_ISR, 0); + alx_write_mem32(hw, ALX_IMR, alx->int_mask); + alx_post_write(hw); + + if (alx->hw.pdev->msix_enabled) { + /* enable all msix irqs */ + for (i = 0; i < alx->num_vec; i++) + alx_mask_msix(hw, i, false); + } +} + +static void alx_irq_disable(struct alx_priv *alx) +{ + struct alx_hw *hw = &alx->hw; + int i; + + alx_write_mem32(hw, ALX_ISR, ALX_ISR_DIS); + alx_write_mem32(hw, ALX_IMR, 0); + alx_post_write(hw); + + if (alx->hw.pdev->msix_enabled) { + for (i = 0; i < alx->num_vec; i++) { + alx_mask_msix(hw, i, true); + synchronize_irq(pci_irq_vector(alx->hw.pdev, i)); + } + } else { + synchronize_irq(pci_irq_vector(alx->hw.pdev, 0)); + } +} + +static int alx_realloc_resources(struct alx_priv *alx) +{ + int err; + + alx_free_rings(alx); + alx_free_napis(alx); + pci_free_irq_vectors(alx->hw.pdev); + + err = alx_init_intr(alx); + if (err) + return err; + + err = alx_alloc_napis(alx); + if (err) + return err; + + err = alx_alloc_rings(alx); + if (err) + return err; + + return 0; +} + +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 (alx->hw.pdev->msix_enabled) { + alx_write_mem32(hw, ALX_MSI_RETRANS_TIMER, msi_ctrl); + err = alx_request_msix(alx); + if (!err) + goto out; + + /* msix request failed, realloc resources */ + err = alx_realloc_resources(alx); + if (err) + goto out; + } + + if (alx->hw.pdev->msi_enabled) { + alx_write_mem32(hw, ALX_MSI_RETRANS_TIMER, + msi_ctrl | ALX_MSI_MASK_SEL_LINE); + err = request_irq(pci_irq_vector(pdev, 0), alx_intr_msi, 0, + alx->dev->name, alx); + if (!err) + goto out; + + /* fall back to legacy interrupt */ + pci_free_irq_vectors(alx->hw.pdev); + } + + alx_write_mem32(hw, ALX_MSI_RETRANS_TIMER, 0); + err = request_irq(pci_irq_vector(pdev, 0), alx_intr_legacy, IRQF_SHARED, + alx->dev->name, alx); +out: + if (!err) + alx_config_vector_mapping(alx); + else + netdev_err(alx->dev, "IRQ registration failed!\n"); + return err; +} + +static void alx_free_irq(struct alx_priv *alx) +{ + struct pci_dev *pdev = alx->hw.pdev; + int i; + + free_irq(pci_irq_vector(pdev, 0), alx); + if (alx->hw.pdev->msix_enabled) { + for (i = 0; i < alx->num_napi; i++) + free_irq(pci_irq_vector(pdev, i + 1), alx->qnapi[i]); + } + + pci_free_irq_vectors(pdev); +} + +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 = ALX_MAX_FRAME_LEN(hw->mtu); + /* MTU range: 34 - 9256 */ + alx->dev->min_mtu = 34; + alx->dev->max_mtu = ALX_MAX_FRAME_LEN(ALX_MAX_FRAME_SIZE); + 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; + mutex_init(&alx->mtx); + + return 0; +} + + +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) +{ + int i; + + netif_trans_update(alx->dev); + if (netif_carrier_ok(alx->dev)) { + netif_carrier_off(alx->dev); + netif_tx_disable(alx->dev); + for (i = 0; i < alx->num_napi; i++) + napi_disable(&alx->qnapi[i]->napi); + } +} + +static void alx_halt(struct alx_priv *alx) +{ + struct alx_hw *hw = &alx->hw; + + lockdep_assert_held(&alx->mtx); + + 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) +{ + lockdep_assert_held(&alx->mtx); + + /* 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) +{ + lockdep_assert_held(&alx->mtx); + + 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 = ALX_MAX_FRAME_LEN(mtu); + + netdev->mtu = mtu; + alx->hw.mtu = mtu; + alx->rxbuf_size = max(max_frame, ALX_DEF_RXBUF_SIZE); + netdev_update_features(netdev); + if (netif_running(netdev)) { + mutex_lock(&alx->mtx); + alx_reinit(alx); + mutex_unlock(&alx->mtx); + } + return 0; +} + +static void alx_netif_start(struct alx_priv *alx) +{ + int i; + + netif_tx_wake_all_queues(alx->dev); + for (i = 0; i < alx->num_napi; i++) + napi_enable(&alx->qnapi[i]->napi); + netif_carrier_on(alx->dev); +} + +static int __alx_open(struct alx_priv *alx, bool resume) +{ + int err; + + err = alx_enable_msix(alx); + if (err < 0) { + err = alx_init_intr(alx); + if (err) + return err; + } + + if (!resume) + netif_carrier_off(alx->dev); + + err = alx_alloc_napis(alx); + if (err) + goto out_disable_adv_intr; + + err = alx_alloc_rings(alx); + if (err) + goto out_free_rings; + + alx_configure(alx); + + err = alx_request_irq(alx); + if (err) + goto out_free_rings; + + /* must be called after alx_request_irq because the chip stops working + * if we copy the dma addresses in alx_init_ring_ptrs twice when + * requesting msi-x interrupts failed + */ + alx_reinit_rings(alx); + + netif_set_real_num_tx_queues(alx->dev, alx->num_txq); + netif_set_real_num_rx_queues(alx->dev, alx->num_rxq); + + /* 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); + alx_free_napis(alx); +out_disable_adv_intr: + pci_free_irq_vectors(alx->hw.pdev); + return err; +} + +static void __alx_stop(struct alx_priv *alx) +{ + lockdep_assert_held(&alx->mtx); + + alx_free_irq(alx); + + cancel_work_sync(&alx->link_check_wk); + cancel_work_sync(&alx->reset_wk); + + alx_halt(alx); + alx_free_rings(alx); + alx_free_napis(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; + int err; + + lockdep_assert_held(&alx->mtx); + + /* clear PHY internal interrupt status, otherwise the main + * interrupt status will be asserted forever + */ + alx_clear_phy_intr(hw); + + old_speed = hw->link_speed; + 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) +{ + struct alx_priv *alx = netdev_priv(netdev); + int ret; + + mutex_lock(&alx->mtx); + ret = __alx_open(alx, false); + mutex_unlock(&alx->mtx); + + return ret; +} + +static int alx_stop(struct net_device *netdev) +{ + struct alx_priv *alx = netdev_priv(netdev); + + mutex_lock(&alx->mtx); + __alx_stop(alx); + mutex_unlock(&alx->mtx); + + 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); + + mutex_lock(&alx->mtx); + alx_check_link(alx); + mutex_unlock(&alx->mtx); +} + +static void alx_reset(struct work_struct *work) +{ + struct alx_priv *alx = container_of(work, struct alx_priv, reset_wk); + + mutex_lock(&alx->mtx); + alx_reinit(alx); + mutex_unlock(&alx->mtx); +} + +static int alx_tpd_req(struct sk_buff *skb) +{ + int num; + + num = skb_shinfo(skb)->nr_frags + 1; + /* we need one extra descriptor for LSOv2 */ + if (skb_is_gso(skb) && skb_shinfo(skb)->gso_type & SKB_GSO_TCPV6) + num++; + + return num; +} + +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_tso(struct sk_buff *skb, struct alx_txd *first) +{ + int err; + + if (skb->ip_summed != CHECKSUM_PARTIAL) + return 0; + + if (!skb_is_gso(skb)) + return 0; + + err = skb_cow_head(skb, 0); + if (err < 0) + return err; + + if (skb->protocol == htons(ETH_P_IP)) { + struct iphdr *iph = ip_hdr(skb); + + iph->check = 0; + tcp_hdr(skb)->check = ~csum_tcpudp_magic(iph->saddr, iph->daddr, + 0, IPPROTO_TCP, 0); + first->word1 |= 1 << TPD_IPV4_SHIFT; + } else if (skb_is_gso_v6(skb)) { + tcp_v6_gso_csum_prep(skb); + /* LSOv2: the first TPD only provides the packet length */ + first->adrl.l.pkt_len = skb->len; + first->word1 |= 1 << TPD_LSO_V2_SHIFT; + } + + first->word1 |= 1 << TPD_LSO_EN_SHIFT; + first->word1 |= (skb_transport_offset(skb) & + TPD_L4HDROFFSET_MASK) << TPD_L4HDROFFSET_SHIFT; + first->word1 |= (skb_shinfo(skb)->gso_size & + TPD_MSS_MASK) << TPD_MSS_SHIFT; + return 1; +} + +static int alx_map_tx_skb(struct alx_tx_queue *txq, struct sk_buff *skb) +{ + 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; + + if (tpd->word1 & (1 << TPD_LSO_V2_SHIFT)) { + if (++txq->write_idx == txq->count) + txq->write_idx = 0; + + tpd = &txq->tpd[txq->write_idx]; + tpd->len = first_tpd->len; + tpd->vlan_tag = first_tpd->vlan_tag; + tpd->word1 = first_tpd->word1; + } + + maplen = skb_headlen(skb); + dma = dma_map_single(txq->dev, skb->data, maplen, + DMA_TO_DEVICE); + if (dma_mapping_error(txq->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++) { + skb_frag_t *frag = &skb_shinfo(skb)->frags[f]; + + if (++txq->write_idx == txq->count) + 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(txq->dev, frag, 0, + maplen, DMA_TO_DEVICE); + if (dma_mapping_error(txq->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 == txq->count) + txq->write_idx = 0; + + return 0; + +err_dma: + f = first_idx; + while (f != txq->write_idx) { + alx_free_txbuf(txq, f); + if (++f == txq->count) + f = 0; + } + return -ENOMEM; +} + +static netdev_tx_t alx_start_xmit_ring(struct sk_buff *skb, + struct alx_tx_queue *txq) +{ + struct alx_priv *alx; + struct alx_txd *first; + int tso; + + alx = netdev_priv(txq->netdev); + + if (alx_tpd_avail(txq) < alx_tpd_req(skb)) { + netif_tx_stop_queue(alx_get_tx_queue(txq)); + goto drop; + } + + first = &txq->tpd[txq->write_idx]; + memset(first, 0, sizeof(*first)); + + tso = alx_tso(skb, first); + if (tso < 0) + goto drop; + else if (!tso && alx_tx_csum(skb, first)) + goto drop; + + if (alx_map_tx_skb(txq, skb) < 0) + goto drop; + + netdev_tx_sent_queue(alx_get_tx_queue(txq), skb->len); + + /* flush updates before updating hardware */ + wmb(); + alx_write_mem16(&alx->hw, txq->p_reg, txq->write_idx); + + if (alx_tpd_avail(txq) < txq->count / 8) + netif_tx_stop_queue(alx_get_tx_queue(txq)); + + return NETDEV_TX_OK; + +drop: + dev_kfree_skb_any(skb); + return NETDEV_TX_OK; +} + +static netdev_tx_t alx_start_xmit(struct sk_buff *skb, + struct net_device *netdev) +{ + struct alx_priv *alx = netdev_priv(netdev); + return alx_start_xmit_ring(skb, alx_tx_queue_mapping(alx, skb)); +} + +static void alx_tx_timeout(struct net_device *dev, unsigned int txqueue) +{ + 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); + int i; + + if (alx->hw.pdev->msix_enabled) { + alx_intr_msix_misc(0, alx); + for (i = 0; i < alx->num_txq; i++) + alx_intr_msix_ring(0, alx->qnapi[i]); + } else if (alx->hw.pdev->msi_enabled) + alx_intr_msi(0, alx); + else + alx_intr_legacy(0, alx); +} +#endif + +static void 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); +} + +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_eth_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 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; + } + } + + err = pci_request_mem_regions(pdev, alx_drv_name); + if (err) { + dev_err(&pdev->dev, + "pci_request_mem_regions failed\n"); + 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_mqs(sizeof(*alx), + ALX_MAX_TX_QUEUES, 1); + 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 = pci_irq_vector(pdev, 0); + 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; + } + + mutex_lock(&alx->mtx); + + 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_unlock; + } + + /* 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_unlock; + } + } + + netdev->hw_features = NETIF_F_SG | + NETIF_F_HW_CSUM | + NETIF_F_RXCSUM | + NETIF_F_TSO | + NETIF_F_TSO6; + + 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); + eth_hw_addr_set(netdev, hw->mac_addr); + 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_unlock; + } + + mutex_unlock(&alx->mtx); + + 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_unlock: + mutex_unlock(&alx->mtx); +out_unmap: + iounmap(hw->hw_addr); +out_free_netdev: + free_netdev(netdev); +out_pci_release: + pci_release_mem_regions(pdev); + pci_disable_pcie_error_reporting(pdev); +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; + + /* restore permanent mac address */ + alx_set_macaddr(hw, hw->perm_addr); + + unregister_netdev(alx->dev); + iounmap(hw->hw_addr); + pci_release_mem_regions(pdev); + + pci_disable_pcie_error_reporting(pdev); + pci_disable_device(pdev); + + mutex_destroy(&alx->mtx); + + free_netdev(alx->dev); +} + +#ifdef CONFIG_PM_SLEEP +static int alx_suspend(struct device *dev) +{ + struct alx_priv *alx = dev_get_drvdata(dev); + + if (!netif_running(alx->dev)) + return 0; + + rtnl_lock(); + netif_device_detach(alx->dev); + + mutex_lock(&alx->mtx); + __alx_stop(alx); + mutex_unlock(&alx->mtx); + rtnl_unlock(); + + return 0; +} + +static int alx_resume(struct device *dev) +{ + struct alx_priv *alx = dev_get_drvdata(dev); + struct alx_hw *hw = &alx->hw; + int err; + + rtnl_lock(); + mutex_lock(&alx->mtx); + alx_reset_phy(hw); + + if (!netif_running(alx->dev)) { + err = 0; + goto unlock; + } + + err = __alx_open(alx, true); + if (err) + goto unlock; + + netif_device_attach(alx->dev); + +unlock: + mutex_unlock(&alx->mtx); + rtnl_unlock(); + return err; +} + +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"); + + mutex_lock(&alx->mtx); + + 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); + + mutex_unlock(&alx->mtx); + + 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"); + + mutex_lock(&alx->mtx); + + 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: + mutex_unlock(&alx->mtx); + + 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"); + + mutex_lock(&alx->mtx); + + if (netif_running(netdev)) { + alx_activate(alx); + netif_device_attach(netdev); + } + + mutex_unlock(&alx->mtx); +} + +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 const struct pci_device_id 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_E2400), + .driver_data = ALX_DEV_QUIRK_MSI_INTX_DISABLE_BUG }, + { PCI_VDEVICE(ATTANSIC, ALX_DEV_ID_E2500), + .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 <johannes@sipsolutions.net>"); +MODULE_AUTHOR("Qualcomm Corporation"); +MODULE_DESCRIPTION( + "Qualcomm Atheros(R) AR816x/AR817x PCI-E Ethernet Network Driver"); +MODULE_LICENSE("GPL"); |