diff options
Diffstat (limited to 'drivers/net/ethernet/apm/xgene/xgene_enet_main.c')
| -rw-r--r-- | drivers/net/ethernet/apm/xgene/xgene_enet_main.c | 2188 |
1 files changed, 2188 insertions, 0 deletions
diff --git a/drivers/net/ethernet/apm/xgene/xgene_enet_main.c b/drivers/net/ethernet/apm/xgene/xgene_enet_main.c new file mode 100644 index 000000000..71151f675 --- /dev/null +++ b/drivers/net/ethernet/apm/xgene/xgene_enet_main.c @@ -0,0 +1,2188 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* Applied Micro X-Gene SoC Ethernet Driver + * + * Copyright (c) 2014, Applied Micro Circuits Corporation + * Authors: Iyappan Subramanian <isubramanian@apm.com> + * Ravi Patel <rapatel@apm.com> + * Keyur Chudgar <kchudgar@apm.com> + */ + +#include <linux/gpio.h> +#include "xgene_enet_main.h" +#include "xgene_enet_hw.h" +#include "xgene_enet_sgmac.h" +#include "xgene_enet_xgmac.h" + +#define RES_ENET_CSR 0 +#define RES_RING_CSR 1 +#define RES_RING_CMD 2 + +static void xgene_enet_init_bufpool(struct xgene_enet_desc_ring *buf_pool) +{ + struct xgene_enet_raw_desc16 *raw_desc; + int i; + + if (!buf_pool) + return; + + for (i = 0; i < buf_pool->slots; i++) { + raw_desc = &buf_pool->raw_desc16[i]; + + /* Hardware expects descriptor in little endian format */ + raw_desc->m0 = cpu_to_le64(i | + SET_VAL(FPQNUM, buf_pool->dst_ring_num) | + SET_VAL(STASH, 3)); + } +} + +static u16 xgene_enet_get_data_len(u64 bufdatalen) +{ + u16 hw_len, mask; + + hw_len = GET_VAL(BUFDATALEN, bufdatalen); + + if (unlikely(hw_len == 0x7800)) { + return 0; + } else if (!(hw_len & BIT(14))) { + mask = GENMASK(13, 0); + return (hw_len & mask) ? (hw_len & mask) : SIZE_16K; + } else if (!(hw_len & GENMASK(13, 12))) { + mask = GENMASK(11, 0); + return (hw_len & mask) ? (hw_len & mask) : SIZE_4K; + } else { + mask = GENMASK(11, 0); + return (hw_len & mask) ? (hw_len & mask) : SIZE_2K; + } +} + +static u16 xgene_enet_set_data_len(u32 size) +{ + u16 hw_len; + + hw_len = (size == SIZE_4K) ? BIT(14) : 0; + + return hw_len; +} + +static int xgene_enet_refill_pagepool(struct xgene_enet_desc_ring *buf_pool, + u32 nbuf) +{ + struct xgene_enet_raw_desc16 *raw_desc; + struct xgene_enet_pdata *pdata; + struct net_device *ndev; + dma_addr_t dma_addr; + struct device *dev; + struct page *page; + u32 slots, tail; + u16 hw_len; + int i; + + if (unlikely(!buf_pool)) + return 0; + + ndev = buf_pool->ndev; + pdata = netdev_priv(ndev); + dev = ndev_to_dev(ndev); + slots = buf_pool->slots - 1; + tail = buf_pool->tail; + + for (i = 0; i < nbuf; i++) { + raw_desc = &buf_pool->raw_desc16[tail]; + + page = dev_alloc_page(); + if (unlikely(!page)) + return -ENOMEM; + + dma_addr = dma_map_page(dev, page, 0, + PAGE_SIZE, DMA_FROM_DEVICE); + if (unlikely(dma_mapping_error(dev, dma_addr))) { + put_page(page); + return -ENOMEM; + } + + hw_len = xgene_enet_set_data_len(PAGE_SIZE); + raw_desc->m1 = cpu_to_le64(SET_VAL(DATAADDR, dma_addr) | + SET_VAL(BUFDATALEN, hw_len) | + SET_BIT(COHERENT)); + + buf_pool->frag_page[tail] = page; + tail = (tail + 1) & slots; + } + + pdata->ring_ops->wr_cmd(buf_pool, nbuf); + buf_pool->tail = tail; + + return 0; +} + +static int xgene_enet_refill_bufpool(struct xgene_enet_desc_ring *buf_pool, + u32 nbuf) +{ + struct sk_buff *skb; + struct xgene_enet_raw_desc16 *raw_desc; + struct xgene_enet_pdata *pdata; + struct net_device *ndev; + struct device *dev; + dma_addr_t dma_addr; + u32 tail = buf_pool->tail; + u32 slots = buf_pool->slots - 1; + u16 bufdatalen, len; + int i; + + ndev = buf_pool->ndev; + dev = ndev_to_dev(buf_pool->ndev); + pdata = netdev_priv(ndev); + + bufdatalen = BUF_LEN_CODE_2K | (SKB_BUFFER_SIZE & GENMASK(11, 0)); + len = XGENE_ENET_STD_MTU; + + for (i = 0; i < nbuf; i++) { + raw_desc = &buf_pool->raw_desc16[tail]; + + skb = netdev_alloc_skb_ip_align(ndev, len); + if (unlikely(!skb)) + return -ENOMEM; + + dma_addr = dma_map_single(dev, skb->data, len, DMA_FROM_DEVICE); + if (dma_mapping_error(dev, dma_addr)) { + netdev_err(ndev, "DMA mapping error\n"); + dev_kfree_skb_any(skb); + return -EINVAL; + } + + buf_pool->rx_skb[tail] = skb; + + raw_desc->m1 = cpu_to_le64(SET_VAL(DATAADDR, dma_addr) | + SET_VAL(BUFDATALEN, bufdatalen) | + SET_BIT(COHERENT)); + tail = (tail + 1) & slots; + } + + pdata->ring_ops->wr_cmd(buf_pool, nbuf); + buf_pool->tail = tail; + + return 0; +} + +static u8 xgene_enet_hdr_len(const void *data) +{ + const struct ethhdr *eth = data; + + return (eth->h_proto == htons(ETH_P_8021Q)) ? VLAN_ETH_HLEN : ETH_HLEN; +} + +static void xgene_enet_delete_bufpool(struct xgene_enet_desc_ring *buf_pool) +{ + struct device *dev = ndev_to_dev(buf_pool->ndev); + struct xgene_enet_raw_desc16 *raw_desc; + dma_addr_t dma_addr; + int i; + + /* Free up the buffers held by hardware */ + for (i = 0; i < buf_pool->slots; i++) { + if (buf_pool->rx_skb[i]) { + dev_kfree_skb_any(buf_pool->rx_skb[i]); + + raw_desc = &buf_pool->raw_desc16[i]; + dma_addr = GET_VAL(DATAADDR, le64_to_cpu(raw_desc->m1)); + dma_unmap_single(dev, dma_addr, XGENE_ENET_MAX_MTU, + DMA_FROM_DEVICE); + } + } +} + +static void xgene_enet_delete_pagepool(struct xgene_enet_desc_ring *buf_pool) +{ + struct device *dev = ndev_to_dev(buf_pool->ndev); + dma_addr_t dma_addr; + struct page *page; + int i; + + /* Free up the buffers held by hardware */ + for (i = 0; i < buf_pool->slots; i++) { + page = buf_pool->frag_page[i]; + if (page) { + dma_addr = buf_pool->frag_dma_addr[i]; + dma_unmap_page(dev, dma_addr, PAGE_SIZE, + DMA_FROM_DEVICE); + put_page(page); + } + } +} + +static irqreturn_t xgene_enet_rx_irq(const int irq, void *data) +{ + struct xgene_enet_desc_ring *rx_ring = data; + + if (napi_schedule_prep(&rx_ring->napi)) { + disable_irq_nosync(irq); + __napi_schedule(&rx_ring->napi); + } + + return IRQ_HANDLED; +} + +static int xgene_enet_tx_completion(struct xgene_enet_desc_ring *cp_ring, + struct xgene_enet_raw_desc *raw_desc) +{ + struct xgene_enet_pdata *pdata = netdev_priv(cp_ring->ndev); + struct sk_buff *skb; + struct device *dev; + skb_frag_t *frag; + dma_addr_t *frag_dma_addr; + u16 skb_index; + u8 mss_index; + u8 status; + int i; + + skb_index = GET_VAL(USERINFO, le64_to_cpu(raw_desc->m0)); + skb = cp_ring->cp_skb[skb_index]; + frag_dma_addr = &cp_ring->frag_dma_addr[skb_index * MAX_SKB_FRAGS]; + + dev = ndev_to_dev(cp_ring->ndev); + dma_unmap_single(dev, GET_VAL(DATAADDR, le64_to_cpu(raw_desc->m1)), + skb_headlen(skb), + DMA_TO_DEVICE); + + for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) { + frag = &skb_shinfo(skb)->frags[i]; + dma_unmap_page(dev, frag_dma_addr[i], skb_frag_size(frag), + DMA_TO_DEVICE); + } + + if (GET_BIT(ET, le64_to_cpu(raw_desc->m3))) { + mss_index = GET_VAL(MSS, le64_to_cpu(raw_desc->m3)); + spin_lock(&pdata->mss_lock); + pdata->mss_refcnt[mss_index]--; + spin_unlock(&pdata->mss_lock); + } + + /* Checking for error */ + status = GET_VAL(LERR, le64_to_cpu(raw_desc->m0)); + if (unlikely(status > 2)) { + cp_ring->tx_dropped++; + cp_ring->tx_errors++; + } + + if (likely(skb)) { + dev_kfree_skb_any(skb); + } else { + netdev_err(cp_ring->ndev, "completion skb is NULL\n"); + } + + return 0; +} + +static int xgene_enet_setup_mss(struct net_device *ndev, u32 mss) +{ + struct xgene_enet_pdata *pdata = netdev_priv(ndev); + int mss_index = -EBUSY; + int i; + + spin_lock(&pdata->mss_lock); + + /* Reuse the slot if MSS matches */ + for (i = 0; mss_index < 0 && i < NUM_MSS_REG; i++) { + if (pdata->mss[i] == mss) { + pdata->mss_refcnt[i]++; + mss_index = i; + } + } + + /* Overwrite the slot with ref_count = 0 */ + for (i = 0; mss_index < 0 && i < NUM_MSS_REG; i++) { + if (!pdata->mss_refcnt[i]) { + pdata->mss_refcnt[i]++; + pdata->mac_ops->set_mss(pdata, mss, i); + pdata->mss[i] = mss; + mss_index = i; + } + } + + spin_unlock(&pdata->mss_lock); + + return mss_index; +} + +static int xgene_enet_work_msg(struct sk_buff *skb, u64 *hopinfo) +{ + struct net_device *ndev = skb->dev; + struct iphdr *iph; + u8 l3hlen = 0, l4hlen = 0; + u8 ethhdr, proto = 0, csum_enable = 0; + u32 hdr_len, mss = 0; + u32 i, len, nr_frags; + int mss_index; + + ethhdr = xgene_enet_hdr_len(skb->data); + + if (unlikely(skb->protocol != htons(ETH_P_IP)) && + unlikely(skb->protocol != htons(ETH_P_8021Q))) + goto out; + + if (unlikely(!(skb->dev->features & NETIF_F_IP_CSUM))) + goto out; + + iph = ip_hdr(skb); + if (unlikely(ip_is_fragment(iph))) + goto out; + + if (likely(iph->protocol == IPPROTO_TCP)) { + l4hlen = tcp_hdrlen(skb) >> 2; + csum_enable = 1; + proto = TSO_IPPROTO_TCP; + if (ndev->features & NETIF_F_TSO) { + hdr_len = ethhdr + ip_hdrlen(skb) + tcp_hdrlen(skb); + mss = skb_shinfo(skb)->gso_size; + + if (skb_is_nonlinear(skb)) { + len = skb_headlen(skb); + nr_frags = skb_shinfo(skb)->nr_frags; + + for (i = 0; i < 2 && i < nr_frags; i++) + len += skb_frag_size( + &skb_shinfo(skb)->frags[i]); + + /* HW requires header must reside in 3 buffer */ + if (unlikely(hdr_len > len)) { + if (skb_linearize(skb)) + return 0; + } + } + + if (!mss || ((skb->len - hdr_len) <= mss)) + goto out; + + mss_index = xgene_enet_setup_mss(ndev, mss); + if (unlikely(mss_index < 0)) + return -EBUSY; + + *hopinfo |= SET_BIT(ET) | SET_VAL(MSS, mss_index); + } + } else if (iph->protocol == IPPROTO_UDP) { + l4hlen = UDP_HDR_SIZE; + csum_enable = 1; + } +out: + l3hlen = ip_hdrlen(skb) >> 2; + *hopinfo |= SET_VAL(TCPHDR, l4hlen) | + SET_VAL(IPHDR, l3hlen) | + SET_VAL(ETHHDR, ethhdr) | + SET_VAL(EC, csum_enable) | + SET_VAL(IS, proto) | + SET_BIT(IC) | + SET_BIT(TYPE_ETH_WORK_MESSAGE); + + return 0; +} + +static u16 xgene_enet_encode_len(u16 len) +{ + return (len == BUFLEN_16K) ? 0 : len; +} + +static void xgene_set_addr_len(__le64 *desc, u32 idx, dma_addr_t addr, u32 len) +{ + desc[idx ^ 1] = cpu_to_le64(SET_VAL(DATAADDR, addr) | + SET_VAL(BUFDATALEN, len)); +} + +static __le64 *xgene_enet_get_exp_bufs(struct xgene_enet_desc_ring *ring) +{ + __le64 *exp_bufs; + + exp_bufs = &ring->exp_bufs[ring->exp_buf_tail * MAX_EXP_BUFFS]; + memset(exp_bufs, 0, sizeof(__le64) * MAX_EXP_BUFFS); + ring->exp_buf_tail = (ring->exp_buf_tail + 1) & ((ring->slots / 2) - 1); + + return exp_bufs; +} + +static dma_addr_t *xgene_get_frag_dma_array(struct xgene_enet_desc_ring *ring) +{ + return &ring->cp_ring->frag_dma_addr[ring->tail * MAX_SKB_FRAGS]; +} + +static int xgene_enet_setup_tx_desc(struct xgene_enet_desc_ring *tx_ring, + struct sk_buff *skb) +{ + struct device *dev = ndev_to_dev(tx_ring->ndev); + struct xgene_enet_pdata *pdata = netdev_priv(tx_ring->ndev); + struct xgene_enet_raw_desc *raw_desc; + __le64 *exp_desc = NULL, *exp_bufs = NULL; + dma_addr_t dma_addr, pbuf_addr, *frag_dma_addr; + skb_frag_t *frag; + u16 tail = tx_ring->tail; + u64 hopinfo = 0; + u32 len, hw_len; + u8 ll = 0, nv = 0, idx = 0; + bool split = false; + u32 size, offset, ell_bytes = 0; + u32 i, fidx, nr_frags, count = 1; + int ret; + + raw_desc = &tx_ring->raw_desc[tail]; + tail = (tail + 1) & (tx_ring->slots - 1); + memset(raw_desc, 0, sizeof(struct xgene_enet_raw_desc)); + + ret = xgene_enet_work_msg(skb, &hopinfo); + if (ret) + return ret; + + raw_desc->m3 = cpu_to_le64(SET_VAL(HENQNUM, tx_ring->dst_ring_num) | + hopinfo); + + len = skb_headlen(skb); + hw_len = xgene_enet_encode_len(len); + + dma_addr = dma_map_single(dev, skb->data, len, DMA_TO_DEVICE); + if (dma_mapping_error(dev, dma_addr)) { + netdev_err(tx_ring->ndev, "DMA mapping error\n"); + return -EINVAL; + } + + /* Hardware expects descriptor in little endian format */ + raw_desc->m1 = cpu_to_le64(SET_VAL(DATAADDR, dma_addr) | + SET_VAL(BUFDATALEN, hw_len) | + SET_BIT(COHERENT)); + + if (!skb_is_nonlinear(skb)) + goto out; + + /* scatter gather */ + nv = 1; + exp_desc = (void *)&tx_ring->raw_desc[tail]; + tail = (tail + 1) & (tx_ring->slots - 1); + memset(exp_desc, 0, sizeof(struct xgene_enet_raw_desc)); + + nr_frags = skb_shinfo(skb)->nr_frags; + for (i = nr_frags; i < 4 ; i++) + exp_desc[i ^ 1] = cpu_to_le64(LAST_BUFFER); + + frag_dma_addr = xgene_get_frag_dma_array(tx_ring); + + for (i = 0, fidx = 0; split || (fidx < nr_frags); i++) { + if (!split) { + frag = &skb_shinfo(skb)->frags[fidx]; + size = skb_frag_size(frag); + offset = 0; + + pbuf_addr = skb_frag_dma_map(dev, frag, 0, size, + DMA_TO_DEVICE); + if (dma_mapping_error(dev, pbuf_addr)) + return -EINVAL; + + frag_dma_addr[fidx] = pbuf_addr; + fidx++; + + if (size > BUFLEN_16K) + split = true; + } + + if (size > BUFLEN_16K) { + len = BUFLEN_16K; + size -= BUFLEN_16K; + } else { + len = size; + split = false; + } + + dma_addr = pbuf_addr + offset; + hw_len = xgene_enet_encode_len(len); + + switch (i) { + case 0: + case 1: + case 2: + xgene_set_addr_len(exp_desc, i, dma_addr, hw_len); + break; + case 3: + if (split || (fidx != nr_frags)) { + exp_bufs = xgene_enet_get_exp_bufs(tx_ring); + xgene_set_addr_len(exp_bufs, idx, dma_addr, + hw_len); + idx++; + ell_bytes += len; + } else { + xgene_set_addr_len(exp_desc, i, dma_addr, + hw_len); + } + break; + default: + xgene_set_addr_len(exp_bufs, idx, dma_addr, hw_len); + idx++; + ell_bytes += len; + break; + } + + if (split) + offset += BUFLEN_16K; + } + count++; + + if (idx) { + ll = 1; + dma_addr = dma_map_single(dev, exp_bufs, + sizeof(u64) * MAX_EXP_BUFFS, + DMA_TO_DEVICE); + if (dma_mapping_error(dev, dma_addr)) { + dev_kfree_skb_any(skb); + return -EINVAL; + } + i = ell_bytes >> LL_BYTES_LSB_LEN; + exp_desc[2] = cpu_to_le64(SET_VAL(DATAADDR, dma_addr) | + SET_VAL(LL_BYTES_MSB, i) | + SET_VAL(LL_LEN, idx)); + raw_desc->m2 = cpu_to_le64(SET_VAL(LL_BYTES_LSB, ell_bytes)); + } + +out: + raw_desc->m0 = cpu_to_le64(SET_VAL(LL, ll) | SET_VAL(NV, nv) | + SET_VAL(USERINFO, tx_ring->tail)); + tx_ring->cp_ring->cp_skb[tx_ring->tail] = skb; + pdata->tx_level[tx_ring->cp_ring->index] += count; + tx_ring->tail = tail; + + return count; +} + +static netdev_tx_t xgene_enet_start_xmit(struct sk_buff *skb, + struct net_device *ndev) +{ + struct xgene_enet_pdata *pdata = netdev_priv(ndev); + struct xgene_enet_desc_ring *tx_ring; + int index = skb->queue_mapping; + u32 tx_level = pdata->tx_level[index]; + int count; + + tx_ring = pdata->tx_ring[index]; + if (tx_level < pdata->txc_level[index]) + tx_level += ((typeof(pdata->tx_level[index]))~0U); + + if ((tx_level - pdata->txc_level[index]) > pdata->tx_qcnt_hi) { + netif_stop_subqueue(ndev, index); + return NETDEV_TX_BUSY; + } + + if (skb_padto(skb, XGENE_MIN_ENET_FRAME_SIZE)) + return NETDEV_TX_OK; + + count = xgene_enet_setup_tx_desc(tx_ring, skb); + if (count == -EBUSY) + return NETDEV_TX_BUSY; + + if (count <= 0) { + dev_kfree_skb_any(skb); + return NETDEV_TX_OK; + } + + skb_tx_timestamp(skb); + + tx_ring->tx_packets++; + tx_ring->tx_bytes += skb->len; + + pdata->ring_ops->wr_cmd(tx_ring, count); + return NETDEV_TX_OK; +} + +static void xgene_enet_rx_csum(struct sk_buff *skb) +{ + struct net_device *ndev = skb->dev; + struct iphdr *iph = ip_hdr(skb); + + if (!(ndev->features & NETIF_F_RXCSUM)) + return; + + if (skb->protocol != htons(ETH_P_IP)) + return; + + if (ip_is_fragment(iph)) + return; + + if (iph->protocol != IPPROTO_TCP && iph->protocol != IPPROTO_UDP) + return; + + skb->ip_summed = CHECKSUM_UNNECESSARY; +} + +static void xgene_enet_free_pagepool(struct xgene_enet_desc_ring *buf_pool, + struct xgene_enet_raw_desc *raw_desc, + struct xgene_enet_raw_desc *exp_desc) +{ + __le64 *desc = (void *)exp_desc; + dma_addr_t dma_addr; + struct device *dev; + struct page *page; + u16 slots, head; + u32 frag_size; + int i; + + if (!buf_pool || !raw_desc || !exp_desc || + (!GET_VAL(NV, le64_to_cpu(raw_desc->m0)))) + return; + + dev = ndev_to_dev(buf_pool->ndev); + slots = buf_pool->slots - 1; + head = buf_pool->head; + + for (i = 0; i < 4; i++) { + frag_size = xgene_enet_get_data_len(le64_to_cpu(desc[i ^ 1])); + if (!frag_size) + break; + + dma_addr = GET_VAL(DATAADDR, le64_to_cpu(desc[i ^ 1])); + dma_unmap_page(dev, dma_addr, PAGE_SIZE, DMA_FROM_DEVICE); + + page = buf_pool->frag_page[head]; + put_page(page); + + buf_pool->frag_page[head] = NULL; + head = (head + 1) & slots; + } + buf_pool->head = head; +} + +/* Errata 10GE_10 and ENET_15 - Fix duplicated HW statistic counters */ +static bool xgene_enet_errata_10GE_10(struct sk_buff *skb, u32 len, u8 status) +{ + if (status == INGRESS_CRC && + len >= (ETHER_STD_PACKET + 1) && + len <= (ETHER_STD_PACKET + 4) && + skb->protocol == htons(ETH_P_8021Q)) + return true; + + return false; +} + +/* Errata 10GE_8 and ENET_11 - allow packet with length <=64B */ +static bool xgene_enet_errata_10GE_8(struct sk_buff *skb, u32 len, u8 status) +{ + if (status == INGRESS_PKT_LEN && len == ETHER_MIN_PACKET) { + if (ntohs(eth_hdr(skb)->h_proto) < 46) + return true; + } + + return false; +} + +static int xgene_enet_rx_frame(struct xgene_enet_desc_ring *rx_ring, + struct xgene_enet_raw_desc *raw_desc, + struct xgene_enet_raw_desc *exp_desc) +{ + struct xgene_enet_desc_ring *buf_pool, *page_pool; + u32 datalen, frag_size, skb_index; + struct xgene_enet_pdata *pdata; + struct net_device *ndev; + dma_addr_t dma_addr; + struct sk_buff *skb; + struct device *dev; + struct page *page; + u16 slots, head; + int i, ret = 0; + __le64 *desc; + u8 status; + bool nv; + + ndev = rx_ring->ndev; + pdata = netdev_priv(ndev); + dev = ndev_to_dev(rx_ring->ndev); + buf_pool = rx_ring->buf_pool; + page_pool = rx_ring->page_pool; + + dma_unmap_single(dev, GET_VAL(DATAADDR, le64_to_cpu(raw_desc->m1)), + XGENE_ENET_STD_MTU, DMA_FROM_DEVICE); + skb_index = GET_VAL(USERINFO, le64_to_cpu(raw_desc->m0)); + skb = buf_pool->rx_skb[skb_index]; + buf_pool->rx_skb[skb_index] = NULL; + + datalen = xgene_enet_get_data_len(le64_to_cpu(raw_desc->m1)); + + /* strip off CRC as HW isn't doing this */ + nv = GET_VAL(NV, le64_to_cpu(raw_desc->m0)); + if (!nv) + datalen -= 4; + + skb_put(skb, datalen); + prefetch(skb->data - NET_IP_ALIGN); + skb->protocol = eth_type_trans(skb, ndev); + + /* checking for error */ + status = (GET_VAL(ELERR, le64_to_cpu(raw_desc->m0)) << LERR_LEN) | + GET_VAL(LERR, le64_to_cpu(raw_desc->m0)); + if (unlikely(status)) { + if (xgene_enet_errata_10GE_8(skb, datalen, status)) { + pdata->false_rflr++; + } else if (xgene_enet_errata_10GE_10(skb, datalen, status)) { + pdata->vlan_rjbr++; + } else { + dev_kfree_skb_any(skb); + xgene_enet_free_pagepool(page_pool, raw_desc, exp_desc); + xgene_enet_parse_error(rx_ring, status); + rx_ring->rx_dropped++; + goto out; + } + } + + if (!nv) + goto skip_jumbo; + + slots = page_pool->slots - 1; + head = page_pool->head; + desc = (void *)exp_desc; + + for (i = 0; i < 4; i++) { + frag_size = xgene_enet_get_data_len(le64_to_cpu(desc[i ^ 1])); + if (!frag_size) + break; + + dma_addr = GET_VAL(DATAADDR, le64_to_cpu(desc[i ^ 1])); + dma_unmap_page(dev, dma_addr, PAGE_SIZE, DMA_FROM_DEVICE); + + page = page_pool->frag_page[head]; + skb_add_rx_frag(skb, skb_shinfo(skb)->nr_frags, page, 0, + frag_size, PAGE_SIZE); + + datalen += frag_size; + + page_pool->frag_page[head] = NULL; + head = (head + 1) & slots; + } + + page_pool->head = head; + rx_ring->npagepool -= skb_shinfo(skb)->nr_frags; + +skip_jumbo: + skb_checksum_none_assert(skb); + xgene_enet_rx_csum(skb); + + rx_ring->rx_packets++; + rx_ring->rx_bytes += datalen; + napi_gro_receive(&rx_ring->napi, skb); + +out: + if (rx_ring->npagepool <= 0) { + ret = xgene_enet_refill_pagepool(page_pool, NUM_NXTBUFPOOL); + rx_ring->npagepool = NUM_NXTBUFPOOL; + if (ret) + return ret; + } + + if (--rx_ring->nbufpool == 0) { + ret = xgene_enet_refill_bufpool(buf_pool, NUM_BUFPOOL); + rx_ring->nbufpool = NUM_BUFPOOL; + } + + return ret; +} + +static bool is_rx_desc(struct xgene_enet_raw_desc *raw_desc) +{ + return GET_VAL(FPQNUM, le64_to_cpu(raw_desc->m0)) ? true : false; +} + +static int xgene_enet_process_ring(struct xgene_enet_desc_ring *ring, + int budget) +{ + struct net_device *ndev = ring->ndev; + struct xgene_enet_pdata *pdata = netdev_priv(ndev); + struct xgene_enet_raw_desc *raw_desc, *exp_desc; + u16 head = ring->head; + u16 slots = ring->slots - 1; + int ret, desc_count, count = 0, processed = 0; + bool is_completion; + + do { + raw_desc = &ring->raw_desc[head]; + desc_count = 0; + is_completion = false; + exp_desc = NULL; + if (unlikely(xgene_enet_is_desc_slot_empty(raw_desc))) + break; + + /* read fpqnum field after dataaddr field */ + dma_rmb(); + if (GET_BIT(NV, le64_to_cpu(raw_desc->m0))) { + head = (head + 1) & slots; + exp_desc = &ring->raw_desc[head]; + + if (unlikely(xgene_enet_is_desc_slot_empty(exp_desc))) { + head = (head - 1) & slots; + break; + } + dma_rmb(); + count++; + desc_count++; + } + if (is_rx_desc(raw_desc)) { + ret = xgene_enet_rx_frame(ring, raw_desc, exp_desc); + } else { + ret = xgene_enet_tx_completion(ring, raw_desc); + is_completion = true; + } + xgene_enet_mark_desc_slot_empty(raw_desc); + if (exp_desc) + xgene_enet_mark_desc_slot_empty(exp_desc); + + head = (head + 1) & slots; + count++; + desc_count++; + processed++; + if (is_completion) + pdata->txc_level[ring->index] += desc_count; + + if (ret) + break; + } while (--budget); + + if (likely(count)) { + pdata->ring_ops->wr_cmd(ring, -count); + ring->head = head; + + if (__netif_subqueue_stopped(ndev, ring->index)) + netif_start_subqueue(ndev, ring->index); + } + + return processed; +} + +static int xgene_enet_napi(struct napi_struct *napi, const int budget) +{ + struct xgene_enet_desc_ring *ring; + int processed; + + ring = container_of(napi, struct xgene_enet_desc_ring, napi); + processed = xgene_enet_process_ring(ring, budget); + + if (processed != budget) { + napi_complete_done(napi, processed); + enable_irq(ring->irq); + } + + return processed; +} + +static void xgene_enet_timeout(struct net_device *ndev, unsigned int txqueue) +{ + struct xgene_enet_pdata *pdata = netdev_priv(ndev); + struct netdev_queue *txq; + int i; + + pdata->mac_ops->reset(pdata); + + for (i = 0; i < pdata->txq_cnt; i++) { + txq = netdev_get_tx_queue(ndev, i); + txq->trans_start = jiffies; + netif_tx_start_queue(txq); + } +} + +static void xgene_enet_set_irq_name(struct net_device *ndev) +{ + struct xgene_enet_pdata *pdata = netdev_priv(ndev); + struct xgene_enet_desc_ring *ring; + int i; + + for (i = 0; i < pdata->rxq_cnt; i++) { + ring = pdata->rx_ring[i]; + if (!pdata->cq_cnt) { + snprintf(ring->irq_name, IRQ_ID_SIZE, "%s-rx-txc", + ndev->name); + } else { + snprintf(ring->irq_name, IRQ_ID_SIZE, "%s-rx-%d", + ndev->name, i); + } + } + + for (i = 0; i < pdata->cq_cnt; i++) { + ring = pdata->tx_ring[i]->cp_ring; + snprintf(ring->irq_name, IRQ_ID_SIZE, "%s-txc-%d", + ndev->name, i); + } +} + +static int xgene_enet_register_irq(struct net_device *ndev) +{ + struct xgene_enet_pdata *pdata = netdev_priv(ndev); + struct device *dev = ndev_to_dev(ndev); + struct xgene_enet_desc_ring *ring; + int ret = 0, i; + + xgene_enet_set_irq_name(ndev); + for (i = 0; i < pdata->rxq_cnt; i++) { + ring = pdata->rx_ring[i]; + irq_set_status_flags(ring->irq, IRQ_DISABLE_UNLAZY); + ret = devm_request_irq(dev, ring->irq, xgene_enet_rx_irq, + 0, ring->irq_name, ring); + if (ret) { + netdev_err(ndev, "Failed to request irq %s\n", + ring->irq_name); + } + } + + for (i = 0; i < pdata->cq_cnt; i++) { + ring = pdata->tx_ring[i]->cp_ring; + irq_set_status_flags(ring->irq, IRQ_DISABLE_UNLAZY); + ret = devm_request_irq(dev, ring->irq, xgene_enet_rx_irq, + 0, ring->irq_name, ring); + if (ret) { + netdev_err(ndev, "Failed to request irq %s\n", + ring->irq_name); + } + } + + return ret; +} + +static void xgene_enet_free_irq(struct net_device *ndev) +{ + struct xgene_enet_pdata *pdata; + struct xgene_enet_desc_ring *ring; + struct device *dev; + int i; + + pdata = netdev_priv(ndev); + dev = ndev_to_dev(ndev); + + for (i = 0; i < pdata->rxq_cnt; i++) { + ring = pdata->rx_ring[i]; + irq_clear_status_flags(ring->irq, IRQ_DISABLE_UNLAZY); + devm_free_irq(dev, ring->irq, ring); + } + + for (i = 0; i < pdata->cq_cnt; i++) { + ring = pdata->tx_ring[i]->cp_ring; + irq_clear_status_flags(ring->irq, IRQ_DISABLE_UNLAZY); + devm_free_irq(dev, ring->irq, ring); + } +} + +static void xgene_enet_napi_enable(struct xgene_enet_pdata *pdata) +{ + struct napi_struct *napi; + int i; + + for (i = 0; i < pdata->rxq_cnt; i++) { + napi = &pdata->rx_ring[i]->napi; + napi_enable(napi); + } + + for (i = 0; i < pdata->cq_cnt; i++) { + napi = &pdata->tx_ring[i]->cp_ring->napi; + napi_enable(napi); + } +} + +static void xgene_enet_napi_disable(struct xgene_enet_pdata *pdata) +{ + struct napi_struct *napi; + int i; + + for (i = 0; i < pdata->rxq_cnt; i++) { + napi = &pdata->rx_ring[i]->napi; + napi_disable(napi); + } + + for (i = 0; i < pdata->cq_cnt; i++) { + napi = &pdata->tx_ring[i]->cp_ring->napi; + napi_disable(napi); + } +} + +static int xgene_enet_open(struct net_device *ndev) +{ + struct xgene_enet_pdata *pdata = netdev_priv(ndev); + const struct xgene_mac_ops *mac_ops = pdata->mac_ops; + int ret; + + ret = netif_set_real_num_tx_queues(ndev, pdata->txq_cnt); + if (ret) + return ret; + + ret = netif_set_real_num_rx_queues(ndev, pdata->rxq_cnt); + if (ret) + return ret; + + xgene_enet_napi_enable(pdata); + ret = xgene_enet_register_irq(ndev); + if (ret) { + xgene_enet_napi_disable(pdata); + return ret; + } + + if (ndev->phydev) { + phy_start(ndev->phydev); + } else { + schedule_delayed_work(&pdata->link_work, PHY_POLL_LINK_OFF); + netif_carrier_off(ndev); + } + + mac_ops->tx_enable(pdata); + mac_ops->rx_enable(pdata); + netif_tx_start_all_queues(ndev); + + return ret; +} + +static int xgene_enet_close(struct net_device *ndev) +{ + struct xgene_enet_pdata *pdata = netdev_priv(ndev); + const struct xgene_mac_ops *mac_ops = pdata->mac_ops; + int i; + + netif_tx_stop_all_queues(ndev); + mac_ops->tx_disable(pdata); + mac_ops->rx_disable(pdata); + + if (ndev->phydev) + phy_stop(ndev->phydev); + else + cancel_delayed_work_sync(&pdata->link_work); + + xgene_enet_free_irq(ndev); + xgene_enet_napi_disable(pdata); + for (i = 0; i < pdata->rxq_cnt; i++) + xgene_enet_process_ring(pdata->rx_ring[i], -1); + + return 0; +} +static void xgene_enet_delete_ring(struct xgene_enet_desc_ring *ring) +{ + struct xgene_enet_pdata *pdata; + struct device *dev; + + pdata = netdev_priv(ring->ndev); + dev = ndev_to_dev(ring->ndev); + + pdata->ring_ops->clear(ring); + dmam_free_coherent(dev, ring->size, ring->desc_addr, ring->dma); +} + +static void xgene_enet_delete_desc_rings(struct xgene_enet_pdata *pdata) +{ + struct xgene_enet_desc_ring *buf_pool, *page_pool; + struct xgene_enet_desc_ring *ring; + int i; + + for (i = 0; i < pdata->txq_cnt; i++) { + ring = pdata->tx_ring[i]; + if (ring) { + xgene_enet_delete_ring(ring); + pdata->port_ops->clear(pdata, ring); + if (pdata->cq_cnt) + xgene_enet_delete_ring(ring->cp_ring); + pdata->tx_ring[i] = NULL; + } + + } + + for (i = 0; i < pdata->rxq_cnt; i++) { + ring = pdata->rx_ring[i]; + if (ring) { + page_pool = ring->page_pool; + if (page_pool) { + xgene_enet_delete_pagepool(page_pool); + xgene_enet_delete_ring(page_pool); + pdata->port_ops->clear(pdata, page_pool); + } + + buf_pool = ring->buf_pool; + xgene_enet_delete_bufpool(buf_pool); + xgene_enet_delete_ring(buf_pool); + pdata->port_ops->clear(pdata, buf_pool); + + xgene_enet_delete_ring(ring); + pdata->rx_ring[i] = NULL; + } + + } +} + +static int xgene_enet_get_ring_size(struct device *dev, + enum xgene_enet_ring_cfgsize cfgsize) +{ + int size = -EINVAL; + + switch (cfgsize) { + case RING_CFGSIZE_512B: + size = 0x200; + break; + case RING_CFGSIZE_2KB: + size = 0x800; + break; + case RING_CFGSIZE_16KB: + size = 0x4000; + break; + case RING_CFGSIZE_64KB: + size = 0x10000; + break; + case RING_CFGSIZE_512KB: + size = 0x80000; + break; + default: + dev_err(dev, "Unsupported cfg ring size %d\n", cfgsize); + break; + } + + return size; +} + +static void xgene_enet_free_desc_ring(struct xgene_enet_desc_ring *ring) +{ + struct xgene_enet_pdata *pdata; + struct device *dev; + + if (!ring) + return; + + dev = ndev_to_dev(ring->ndev); + pdata = netdev_priv(ring->ndev); + + if (ring->desc_addr) { + pdata->ring_ops->clear(ring); + dmam_free_coherent(dev, ring->size, ring->desc_addr, ring->dma); + } + devm_kfree(dev, ring); +} + +static void xgene_enet_free_desc_rings(struct xgene_enet_pdata *pdata) +{ + struct xgene_enet_desc_ring *page_pool; + struct device *dev = &pdata->pdev->dev; + struct xgene_enet_desc_ring *ring; + void *p; + int i; + + for (i = 0; i < pdata->txq_cnt; i++) { + ring = pdata->tx_ring[i]; + if (ring) { + if (ring->cp_ring && ring->cp_ring->cp_skb) + devm_kfree(dev, ring->cp_ring->cp_skb); + + if (ring->cp_ring && pdata->cq_cnt) + xgene_enet_free_desc_ring(ring->cp_ring); + + xgene_enet_free_desc_ring(ring); + } + + } + + for (i = 0; i < pdata->rxq_cnt; i++) { + ring = pdata->rx_ring[i]; + if (ring) { + if (ring->buf_pool) { + if (ring->buf_pool->rx_skb) + devm_kfree(dev, ring->buf_pool->rx_skb); + + xgene_enet_free_desc_ring(ring->buf_pool); + } + + page_pool = ring->page_pool; + if (page_pool) { + p = page_pool->frag_page; + if (p) + devm_kfree(dev, p); + + p = page_pool->frag_dma_addr; + if (p) + devm_kfree(dev, p); + } + + xgene_enet_free_desc_ring(ring); + } + } +} + +static bool is_irq_mbox_required(struct xgene_enet_pdata *pdata, + struct xgene_enet_desc_ring *ring) +{ + if ((pdata->enet_id == XGENE_ENET2) && + (xgene_enet_ring_owner(ring->id) == RING_OWNER_CPU)) { + return true; + } + + return false; +} + +static void __iomem *xgene_enet_ring_cmd_base(struct xgene_enet_pdata *pdata, + struct xgene_enet_desc_ring *ring) +{ + u8 num_ring_id_shift = pdata->ring_ops->num_ring_id_shift; + + return pdata->ring_cmd_addr + (ring->num << num_ring_id_shift); +} + +static struct xgene_enet_desc_ring *xgene_enet_create_desc_ring( + struct net_device *ndev, u32 ring_num, + enum xgene_enet_ring_cfgsize cfgsize, u32 ring_id) +{ + struct xgene_enet_pdata *pdata = netdev_priv(ndev); + struct device *dev = ndev_to_dev(ndev); + struct xgene_enet_desc_ring *ring; + void *irq_mbox_addr; + int size; + + size = xgene_enet_get_ring_size(dev, cfgsize); + if (size < 0) + return NULL; + + ring = devm_kzalloc(dev, sizeof(struct xgene_enet_desc_ring), + GFP_KERNEL); + if (!ring) + return NULL; + + ring->ndev = ndev; + ring->num = ring_num; + ring->cfgsize = cfgsize; + ring->id = ring_id; + + ring->desc_addr = dmam_alloc_coherent(dev, size, &ring->dma, + GFP_KERNEL | __GFP_ZERO); + if (!ring->desc_addr) { + devm_kfree(dev, ring); + return NULL; + } + ring->size = size; + + if (is_irq_mbox_required(pdata, ring)) { + irq_mbox_addr = dmam_alloc_coherent(dev, INTR_MBOX_SIZE, + &ring->irq_mbox_dma, + GFP_KERNEL | __GFP_ZERO); + if (!irq_mbox_addr) { + dmam_free_coherent(dev, size, ring->desc_addr, + ring->dma); + devm_kfree(dev, ring); + return NULL; + } + ring->irq_mbox_addr = irq_mbox_addr; + } + + ring->cmd_base = xgene_enet_ring_cmd_base(pdata, ring); + ring->cmd = ring->cmd_base + INC_DEC_CMD_ADDR; + ring = pdata->ring_ops->setup(ring); + netdev_dbg(ndev, "ring info: num=%d size=%d id=%d slots=%d\n", + ring->num, ring->size, ring->id, ring->slots); + + return ring; +} + +static u16 xgene_enet_get_ring_id(enum xgene_ring_owner owner, u8 bufnum) +{ + return (owner << 6) | (bufnum & GENMASK(5, 0)); +} + +static enum xgene_ring_owner xgene_derive_ring_owner(struct xgene_enet_pdata *p) +{ + enum xgene_ring_owner owner; + + if (p->enet_id == XGENE_ENET1) { + switch (p->phy_mode) { + case PHY_INTERFACE_MODE_SGMII: + owner = RING_OWNER_ETH0; + break; + default: + owner = (!p->port_id) ? RING_OWNER_ETH0 : + RING_OWNER_ETH1; + break; + } + } else { + owner = (!p->port_id) ? RING_OWNER_ETH0 : RING_OWNER_ETH1; + } + + return owner; +} + +static u8 xgene_start_cpu_bufnum(struct xgene_enet_pdata *pdata) +{ + struct device *dev = &pdata->pdev->dev; + u32 cpu_bufnum; + int ret; + + ret = device_property_read_u32(dev, "channel", &cpu_bufnum); + + return (!ret) ? cpu_bufnum : pdata->cpu_bufnum; +} + +static int xgene_enet_create_desc_rings(struct net_device *ndev) +{ + struct xgene_enet_desc_ring *rx_ring, *tx_ring, *cp_ring; + struct xgene_enet_pdata *pdata = netdev_priv(ndev); + struct xgene_enet_desc_ring *page_pool = NULL; + struct xgene_enet_desc_ring *buf_pool = NULL; + struct device *dev = ndev_to_dev(ndev); + u8 eth_bufnum = pdata->eth_bufnum; + u8 bp_bufnum = pdata->bp_bufnum; + u16 ring_num = pdata->ring_num; + enum xgene_ring_owner owner; + dma_addr_t dma_exp_bufs; + u16 ring_id, slots; + __le64 *exp_bufs; + int i, ret, size; + u8 cpu_bufnum; + + cpu_bufnum = xgene_start_cpu_bufnum(pdata); + + for (i = 0; i < pdata->rxq_cnt; i++) { + /* allocate rx descriptor ring */ + owner = xgene_derive_ring_owner(pdata); + ring_id = xgene_enet_get_ring_id(RING_OWNER_CPU, cpu_bufnum++); + rx_ring = xgene_enet_create_desc_ring(ndev, ring_num++, + RING_CFGSIZE_16KB, + ring_id); + if (!rx_ring) { + ret = -ENOMEM; + goto err; + } + + /* allocate buffer pool for receiving packets */ + owner = xgene_derive_ring_owner(pdata); + ring_id = xgene_enet_get_ring_id(owner, bp_bufnum++); + buf_pool = xgene_enet_create_desc_ring(ndev, ring_num++, + RING_CFGSIZE_16KB, + ring_id); + if (!buf_pool) { + ret = -ENOMEM; + goto err; + } + + rx_ring->nbufpool = NUM_BUFPOOL; + rx_ring->npagepool = NUM_NXTBUFPOOL; + rx_ring->irq = pdata->irqs[i]; + buf_pool->rx_skb = devm_kcalloc(dev, buf_pool->slots, + sizeof(struct sk_buff *), + GFP_KERNEL); + if (!buf_pool->rx_skb) { + ret = -ENOMEM; + goto err; + } + + buf_pool->dst_ring_num = xgene_enet_dst_ring_num(buf_pool); + rx_ring->buf_pool = buf_pool; + pdata->rx_ring[i] = rx_ring; + + if ((pdata->enet_id == XGENE_ENET1 && pdata->rxq_cnt > 4) || + (pdata->enet_id == XGENE_ENET2 && pdata->rxq_cnt > 16)) { + break; + } + + /* allocate next buffer pool for jumbo packets */ + owner = xgene_derive_ring_owner(pdata); + ring_id = xgene_enet_get_ring_id(owner, bp_bufnum++); + page_pool = xgene_enet_create_desc_ring(ndev, ring_num++, + RING_CFGSIZE_16KB, + ring_id); + if (!page_pool) { + ret = -ENOMEM; + goto err; + } + + slots = page_pool->slots; + page_pool->frag_page = devm_kcalloc(dev, slots, + sizeof(struct page *), + GFP_KERNEL); + if (!page_pool->frag_page) { + ret = -ENOMEM; + goto err; + } + + page_pool->frag_dma_addr = devm_kcalloc(dev, slots, + sizeof(dma_addr_t), + GFP_KERNEL); + if (!page_pool->frag_dma_addr) { + ret = -ENOMEM; + goto err; + } + + page_pool->dst_ring_num = xgene_enet_dst_ring_num(page_pool); + rx_ring->page_pool = page_pool; + } + + for (i = 0; i < pdata->txq_cnt; i++) { + /* allocate tx descriptor ring */ + owner = xgene_derive_ring_owner(pdata); + ring_id = xgene_enet_get_ring_id(owner, eth_bufnum++); + tx_ring = xgene_enet_create_desc_ring(ndev, ring_num++, + RING_CFGSIZE_16KB, + ring_id); + if (!tx_ring) { + ret = -ENOMEM; + goto err; + } + + size = (tx_ring->slots / 2) * sizeof(__le64) * MAX_EXP_BUFFS; + exp_bufs = dmam_alloc_coherent(dev, size, &dma_exp_bufs, + GFP_KERNEL | __GFP_ZERO); + if (!exp_bufs) { + ret = -ENOMEM; + goto err; + } + tx_ring->exp_bufs = exp_bufs; + + pdata->tx_ring[i] = tx_ring; + + if (!pdata->cq_cnt) { + cp_ring = pdata->rx_ring[i]; + } else { + /* allocate tx completion descriptor ring */ + ring_id = xgene_enet_get_ring_id(RING_OWNER_CPU, + cpu_bufnum++); + cp_ring = xgene_enet_create_desc_ring(ndev, ring_num++, + RING_CFGSIZE_16KB, + ring_id); + if (!cp_ring) { + ret = -ENOMEM; + goto err; + } + + cp_ring->irq = pdata->irqs[pdata->rxq_cnt + i]; + cp_ring->index = i; + } + + cp_ring->cp_skb = devm_kcalloc(dev, tx_ring->slots, + sizeof(struct sk_buff *), + GFP_KERNEL); + if (!cp_ring->cp_skb) { + ret = -ENOMEM; + goto err; + } + + size = sizeof(dma_addr_t) * MAX_SKB_FRAGS; + cp_ring->frag_dma_addr = devm_kcalloc(dev, tx_ring->slots, + size, GFP_KERNEL); + if (!cp_ring->frag_dma_addr) { + devm_kfree(dev, cp_ring->cp_skb); + ret = -ENOMEM; + goto err; + } + + tx_ring->cp_ring = cp_ring; + tx_ring->dst_ring_num = xgene_enet_dst_ring_num(cp_ring); + } + + if (pdata->ring_ops->coalesce) + pdata->ring_ops->coalesce(pdata->tx_ring[0]); + pdata->tx_qcnt_hi = pdata->tx_ring[0]->slots - 128; + + return 0; + +err: + xgene_enet_free_desc_rings(pdata); + return ret; +} + +static void xgene_enet_get_stats64( + struct net_device *ndev, + struct rtnl_link_stats64 *stats) +{ + struct xgene_enet_pdata *pdata = netdev_priv(ndev); + struct xgene_enet_desc_ring *ring; + int i; + + for (i = 0; i < pdata->txq_cnt; i++) { + ring = pdata->tx_ring[i]; + if (ring) { + stats->tx_packets += ring->tx_packets; + stats->tx_bytes += ring->tx_bytes; + stats->tx_dropped += ring->tx_dropped; + stats->tx_errors += ring->tx_errors; + } + } + + for (i = 0; i < pdata->rxq_cnt; i++) { + ring = pdata->rx_ring[i]; + if (ring) { + stats->rx_packets += ring->rx_packets; + stats->rx_bytes += ring->rx_bytes; + stats->rx_dropped += ring->rx_dropped; + stats->rx_errors += ring->rx_errors + + ring->rx_length_errors + + ring->rx_crc_errors + + ring->rx_frame_errors + + ring->rx_fifo_errors; + stats->rx_length_errors += ring->rx_length_errors; + stats->rx_crc_errors += ring->rx_crc_errors; + stats->rx_frame_errors += ring->rx_frame_errors; + stats->rx_fifo_errors += ring->rx_fifo_errors; + } + } +} + +static int xgene_enet_set_mac_address(struct net_device *ndev, void *addr) +{ + struct xgene_enet_pdata *pdata = netdev_priv(ndev); + int ret; + + ret = eth_mac_addr(ndev, addr); + if (ret) + return ret; + pdata->mac_ops->set_mac_addr(pdata); + + return ret; +} + +static int xgene_change_mtu(struct net_device *ndev, int new_mtu) +{ + struct xgene_enet_pdata *pdata = netdev_priv(ndev); + int frame_size; + + if (!netif_running(ndev)) + return 0; + + frame_size = (new_mtu > ETH_DATA_LEN) ? (new_mtu + 18) : 0x600; + + xgene_enet_close(ndev); + ndev->mtu = new_mtu; + pdata->mac_ops->set_framesize(pdata, frame_size); + xgene_enet_open(ndev); + + return 0; +} + +static const struct net_device_ops xgene_ndev_ops = { + .ndo_open = xgene_enet_open, + .ndo_stop = xgene_enet_close, + .ndo_start_xmit = xgene_enet_start_xmit, + .ndo_tx_timeout = xgene_enet_timeout, + .ndo_get_stats64 = xgene_enet_get_stats64, + .ndo_change_mtu = xgene_change_mtu, + .ndo_set_mac_address = xgene_enet_set_mac_address, +}; + +#ifdef CONFIG_ACPI +static void xgene_get_port_id_acpi(struct device *dev, + struct xgene_enet_pdata *pdata) +{ + acpi_status status; + u64 temp; + + status = acpi_evaluate_integer(ACPI_HANDLE(dev), "_SUN", NULL, &temp); + if (ACPI_FAILURE(status)) { + pdata->port_id = 0; + } else { + pdata->port_id = temp; + } + + return; +} +#endif + +static void xgene_get_port_id_dt(struct device *dev, struct xgene_enet_pdata *pdata) +{ + u32 id = 0; + + of_property_read_u32(dev->of_node, "port-id", &id); + + pdata->port_id = id & BIT(0); + + return; +} + +static int xgene_get_tx_delay(struct xgene_enet_pdata *pdata) +{ + struct device *dev = &pdata->pdev->dev; + int delay, ret; + + ret = device_property_read_u32(dev, "tx-delay", &delay); + if (ret) { + pdata->tx_delay = 4; + return 0; + } + + if (delay < 0 || delay > 7) { + dev_err(dev, "Invalid tx-delay specified\n"); + return -EINVAL; + } + + pdata->tx_delay = delay; + + return 0; +} + +static int xgene_get_rx_delay(struct xgene_enet_pdata *pdata) +{ + struct device *dev = &pdata->pdev->dev; + int delay, ret; + + ret = device_property_read_u32(dev, "rx-delay", &delay); + if (ret) { + pdata->rx_delay = 2; + return 0; + } + + if (delay < 0 || delay > 7) { + dev_err(dev, "Invalid rx-delay specified\n"); + return -EINVAL; + } + + pdata->rx_delay = delay; + + return 0; +} + +static int xgene_enet_get_irqs(struct xgene_enet_pdata *pdata) +{ + struct platform_device *pdev = pdata->pdev; + int i, ret, max_irqs; + + if (phy_interface_mode_is_rgmii(pdata->phy_mode)) + max_irqs = 1; + else if (pdata->phy_mode == PHY_INTERFACE_MODE_SGMII) + max_irqs = 2; + else + max_irqs = XGENE_MAX_ENET_IRQ; + + for (i = 0; i < max_irqs; i++) { + ret = platform_get_irq(pdev, i); + if (ret <= 0) { + if (pdata->phy_mode == PHY_INTERFACE_MODE_XGMII) { + max_irqs = i; + pdata->rxq_cnt = max_irqs / 2; + pdata->txq_cnt = max_irqs / 2; + pdata->cq_cnt = max_irqs / 2; + break; + } + return ret ? : -ENXIO; + } + pdata->irqs[i] = ret; + } + + return 0; +} + +static void xgene_enet_check_phy_handle(struct xgene_enet_pdata *pdata) +{ + int ret; + + if (pdata->phy_mode == PHY_INTERFACE_MODE_XGMII) + return; + + if (!IS_ENABLED(CONFIG_MDIO_XGENE)) + return; + + ret = xgene_enet_phy_connect(pdata->ndev); + if (!ret) + pdata->mdio_driver = true; +} + +static void xgene_enet_gpiod_get(struct xgene_enet_pdata *pdata) +{ + struct device *dev = &pdata->pdev->dev; + + pdata->sfp_gpio_en = false; + if (pdata->phy_mode != PHY_INTERFACE_MODE_XGMII || + (!device_property_present(dev, "sfp-gpios") && + !device_property_present(dev, "rxlos-gpios"))) + return; + + pdata->sfp_gpio_en = true; + pdata->sfp_rdy = gpiod_get(dev, "rxlos", GPIOD_IN); + if (IS_ERR(pdata->sfp_rdy)) + pdata->sfp_rdy = gpiod_get(dev, "sfp", GPIOD_IN); +} + +static int xgene_enet_get_resources(struct xgene_enet_pdata *pdata) +{ + struct platform_device *pdev; + struct net_device *ndev; + struct device *dev; + struct resource *res; + void __iomem *base_addr; + u32 offset; + int ret = 0; + + pdev = pdata->pdev; + dev = &pdev->dev; + ndev = pdata->ndev; + + res = platform_get_resource(pdev, IORESOURCE_MEM, RES_ENET_CSR); + if (!res) { + dev_err(dev, "Resource enet_csr not defined\n"); + return -ENODEV; + } + pdata->base_addr = devm_ioremap(dev, res->start, resource_size(res)); + if (!pdata->base_addr) { + dev_err(dev, "Unable to retrieve ENET Port CSR region\n"); + return -ENOMEM; + } + + res = platform_get_resource(pdev, IORESOURCE_MEM, RES_RING_CSR); + if (!res) { + dev_err(dev, "Resource ring_csr not defined\n"); + return -ENODEV; + } + pdata->ring_csr_addr = devm_ioremap(dev, res->start, + resource_size(res)); + if (!pdata->ring_csr_addr) { + dev_err(dev, "Unable to retrieve ENET Ring CSR region\n"); + return -ENOMEM; + } + + res = platform_get_resource(pdev, IORESOURCE_MEM, RES_RING_CMD); + if (!res) { + dev_err(dev, "Resource ring_cmd not defined\n"); + return -ENODEV; + } + pdata->ring_cmd_addr = devm_ioremap(dev, res->start, + resource_size(res)); + if (!pdata->ring_cmd_addr) { + dev_err(dev, "Unable to retrieve ENET Ring command region\n"); + return -ENOMEM; + } + + if (dev->of_node) + xgene_get_port_id_dt(dev, pdata); +#ifdef CONFIG_ACPI + else + xgene_get_port_id_acpi(dev, pdata); +#endif + + if (!device_get_mac_address(dev, ndev->dev_addr, ETH_ALEN)) + eth_hw_addr_random(ndev); + + memcpy(ndev->perm_addr, ndev->dev_addr, ndev->addr_len); + + pdata->phy_mode = device_get_phy_mode(dev); + if (pdata->phy_mode < 0) { + dev_err(dev, "Unable to get phy-connection-type\n"); + return pdata->phy_mode; + } + if (!phy_interface_mode_is_rgmii(pdata->phy_mode) && + pdata->phy_mode != PHY_INTERFACE_MODE_SGMII && + pdata->phy_mode != PHY_INTERFACE_MODE_XGMII) { + dev_err(dev, "Incorrect phy-connection-type specified\n"); + return -ENODEV; + } + + ret = xgene_get_tx_delay(pdata); + if (ret) + return ret; + + ret = xgene_get_rx_delay(pdata); + if (ret) + return ret; + + ret = xgene_enet_get_irqs(pdata); + if (ret) + return ret; + + xgene_enet_gpiod_get(pdata); + + pdata->clk = devm_clk_get(&pdev->dev, NULL); + if (IS_ERR(pdata->clk)) { + if (pdata->phy_mode != PHY_INTERFACE_MODE_SGMII) { + /* Abort if the clock is defined but couldn't be + * retrived. Always abort if the clock is missing on + * DT system as the driver can't cope with this case. + */ + if (PTR_ERR(pdata->clk) != -ENOENT || dev->of_node) + return PTR_ERR(pdata->clk); + /* Firmware may have set up the clock already. */ + dev_info(dev, "clocks have been setup already\n"); + } + } + + if (pdata->phy_mode != PHY_INTERFACE_MODE_XGMII) + base_addr = pdata->base_addr - (pdata->port_id * MAC_OFFSET); + else + base_addr = pdata->base_addr; + pdata->eth_csr_addr = base_addr + BLOCK_ETH_CSR_OFFSET; + pdata->cle.base = base_addr + BLOCK_ETH_CLE_CSR_OFFSET; + pdata->eth_ring_if_addr = base_addr + BLOCK_ETH_RING_IF_OFFSET; + pdata->eth_diag_csr_addr = base_addr + BLOCK_ETH_DIAG_CSR_OFFSET; + if (phy_interface_mode_is_rgmii(pdata->phy_mode) || + pdata->phy_mode == PHY_INTERFACE_MODE_SGMII) { + pdata->mcx_mac_addr = pdata->base_addr + BLOCK_ETH_MAC_OFFSET; + pdata->mcx_stats_addr = + pdata->base_addr + BLOCK_ETH_STATS_OFFSET; + offset = (pdata->enet_id == XGENE_ENET1) ? + BLOCK_ETH_MAC_CSR_OFFSET : + X2_BLOCK_ETH_MAC_CSR_OFFSET; + pdata->mcx_mac_csr_addr = base_addr + offset; + } else { + pdata->mcx_mac_addr = base_addr + BLOCK_AXG_MAC_OFFSET; + pdata->mcx_stats_addr = base_addr + BLOCK_AXG_STATS_OFFSET; + pdata->mcx_mac_csr_addr = base_addr + BLOCK_AXG_MAC_CSR_OFFSET; + pdata->pcs_addr = base_addr + BLOCK_PCS_OFFSET; + } + pdata->rx_buff_cnt = NUM_PKT_BUF; + + return 0; +} + +static int xgene_enet_init_hw(struct xgene_enet_pdata *pdata) +{ + struct xgene_enet_cle *enet_cle = &pdata->cle; + struct xgene_enet_desc_ring *page_pool; + struct net_device *ndev = pdata->ndev; + struct xgene_enet_desc_ring *buf_pool; + u16 dst_ring_num, ring_id; + int i, ret; + u32 count; + + ret = pdata->port_ops->reset(pdata); + if (ret) + return ret; + + ret = xgene_enet_create_desc_rings(ndev); + if (ret) { + netdev_err(ndev, "Error in ring configuration\n"); + return ret; + } + + /* setup buffer pool */ + for (i = 0; i < pdata->rxq_cnt; i++) { + buf_pool = pdata->rx_ring[i]->buf_pool; + xgene_enet_init_bufpool(buf_pool); + page_pool = pdata->rx_ring[i]->page_pool; + xgene_enet_init_bufpool(page_pool); + + count = pdata->rx_buff_cnt; + ret = xgene_enet_refill_bufpool(buf_pool, count); + if (ret) + goto err; + + ret = xgene_enet_refill_pagepool(page_pool, count); + if (ret) + goto err; + + } + + dst_ring_num = xgene_enet_dst_ring_num(pdata->rx_ring[0]); + buf_pool = pdata->rx_ring[0]->buf_pool; + if (pdata->phy_mode == PHY_INTERFACE_MODE_XGMII) { + /* Initialize and Enable PreClassifier Tree */ + enet_cle->max_nodes = 512; + enet_cle->max_dbptrs = 1024; + enet_cle->parsers = 3; + enet_cle->active_parser = PARSER_ALL; + enet_cle->ptree.start_node = 0; + enet_cle->ptree.start_dbptr = 0; + enet_cle->jump_bytes = 8; + ret = pdata->cle_ops->cle_init(pdata); + if (ret) { + netdev_err(ndev, "Preclass Tree init error\n"); + goto err; + } + + } else { + dst_ring_num = xgene_enet_dst_ring_num(pdata->rx_ring[0]); + buf_pool = pdata->rx_ring[0]->buf_pool; + page_pool = pdata->rx_ring[0]->page_pool; + ring_id = (page_pool) ? page_pool->id : 0; + pdata->port_ops->cle_bypass(pdata, dst_ring_num, + buf_pool->id, ring_id); + } + + ndev->max_mtu = XGENE_ENET_MAX_MTU; + pdata->phy_speed = SPEED_UNKNOWN; + pdata->mac_ops->init(pdata); + + return ret; + +err: + xgene_enet_delete_desc_rings(pdata); + return ret; +} + +static void xgene_enet_setup_ops(struct xgene_enet_pdata *pdata) +{ + switch (pdata->phy_mode) { + case PHY_INTERFACE_MODE_RGMII: + case PHY_INTERFACE_MODE_RGMII_ID: + case PHY_INTERFACE_MODE_RGMII_RXID: + case PHY_INTERFACE_MODE_RGMII_TXID: + pdata->mac_ops = &xgene_gmac_ops; + pdata->port_ops = &xgene_gport_ops; + pdata->rm = RM3; + pdata->rxq_cnt = 1; + pdata->txq_cnt = 1; + pdata->cq_cnt = 0; + break; + case PHY_INTERFACE_MODE_SGMII: + pdata->mac_ops = &xgene_sgmac_ops; + pdata->port_ops = &xgene_sgport_ops; + pdata->rm = RM1; + pdata->rxq_cnt = 1; + pdata->txq_cnt = 1; + pdata->cq_cnt = 1; + break; + default: + pdata->mac_ops = &xgene_xgmac_ops; + pdata->port_ops = &xgene_xgport_ops; + pdata->cle_ops = &xgene_cle3in_ops; + pdata->rm = RM0; + if (!pdata->rxq_cnt) { + pdata->rxq_cnt = XGENE_NUM_RX_RING; + pdata->txq_cnt = XGENE_NUM_TX_RING; + pdata->cq_cnt = XGENE_NUM_TXC_RING; + } + break; + } + + if (pdata->enet_id == XGENE_ENET1) { + switch (pdata->port_id) { + case 0: + if (pdata->phy_mode == PHY_INTERFACE_MODE_XGMII) { + pdata->cpu_bufnum = X2_START_CPU_BUFNUM_0; + pdata->eth_bufnum = X2_START_ETH_BUFNUM_0; + pdata->bp_bufnum = X2_START_BP_BUFNUM_0; + pdata->ring_num = START_RING_NUM_0; + } else { + pdata->cpu_bufnum = START_CPU_BUFNUM_0; + pdata->eth_bufnum = START_ETH_BUFNUM_0; + pdata->bp_bufnum = START_BP_BUFNUM_0; + pdata->ring_num = START_RING_NUM_0; + } + break; + case 1: + if (pdata->phy_mode == PHY_INTERFACE_MODE_XGMII) { + pdata->cpu_bufnum = XG_START_CPU_BUFNUM_1; + pdata->eth_bufnum = XG_START_ETH_BUFNUM_1; + pdata->bp_bufnum = XG_START_BP_BUFNUM_1; + pdata->ring_num = XG_START_RING_NUM_1; + } else { + pdata->cpu_bufnum = START_CPU_BUFNUM_1; + pdata->eth_bufnum = START_ETH_BUFNUM_1; + pdata->bp_bufnum = START_BP_BUFNUM_1; + pdata->ring_num = START_RING_NUM_1; + } + break; + default: + break; + } + pdata->ring_ops = &xgene_ring1_ops; + } else { + switch (pdata->port_id) { + case 0: + pdata->cpu_bufnum = X2_START_CPU_BUFNUM_0; + pdata->eth_bufnum = X2_START_ETH_BUFNUM_0; + pdata->bp_bufnum = X2_START_BP_BUFNUM_0; + pdata->ring_num = X2_START_RING_NUM_0; + break; + case 1: + pdata->cpu_bufnum = X2_START_CPU_BUFNUM_1; + pdata->eth_bufnum = X2_START_ETH_BUFNUM_1; + pdata->bp_bufnum = X2_START_BP_BUFNUM_1; + pdata->ring_num = X2_START_RING_NUM_1; + break; + default: + break; + } + pdata->rm = RM0; + pdata->ring_ops = &xgene_ring2_ops; + } +} + +static void xgene_enet_napi_add(struct xgene_enet_pdata *pdata) +{ + struct napi_struct *napi; + int i; + + for (i = 0; i < pdata->rxq_cnt; i++) { + napi = &pdata->rx_ring[i]->napi; + netif_napi_add(pdata->ndev, napi, xgene_enet_napi, + NAPI_POLL_WEIGHT); + } + + for (i = 0; i < pdata->cq_cnt; i++) { + napi = &pdata->tx_ring[i]->cp_ring->napi; + netif_napi_add(pdata->ndev, napi, xgene_enet_napi, + NAPI_POLL_WEIGHT); + } +} + +#ifdef CONFIG_ACPI +static const struct acpi_device_id xgene_enet_acpi_match[] = { + { "APMC0D05", XGENE_ENET1}, + { "APMC0D30", XGENE_ENET1}, + { "APMC0D31", XGENE_ENET1}, + { "APMC0D3F", XGENE_ENET1}, + { "APMC0D26", XGENE_ENET2}, + { "APMC0D25", XGENE_ENET2}, + { } +}; +MODULE_DEVICE_TABLE(acpi, xgene_enet_acpi_match); +#endif + +static const struct of_device_id xgene_enet_of_match[] = { + {.compatible = "apm,xgene-enet", .data = (void *)XGENE_ENET1}, + {.compatible = "apm,xgene1-sgenet", .data = (void *)XGENE_ENET1}, + {.compatible = "apm,xgene1-xgenet", .data = (void *)XGENE_ENET1}, + {.compatible = "apm,xgene2-sgenet", .data = (void *)XGENE_ENET2}, + {.compatible = "apm,xgene2-xgenet", .data = (void *)XGENE_ENET2}, + {}, +}; + +MODULE_DEVICE_TABLE(of, xgene_enet_of_match); + +static int xgene_enet_probe(struct platform_device *pdev) +{ + struct net_device *ndev; + struct xgene_enet_pdata *pdata; + struct device *dev = &pdev->dev; + void (*link_state)(struct work_struct *); + const struct of_device_id *of_id; + int ret; + + ndev = alloc_etherdev_mqs(sizeof(struct xgene_enet_pdata), + XGENE_NUM_TX_RING, XGENE_NUM_RX_RING); + if (!ndev) + return -ENOMEM; + + pdata = netdev_priv(ndev); + + pdata->pdev = pdev; + pdata->ndev = ndev; + SET_NETDEV_DEV(ndev, dev); + platform_set_drvdata(pdev, pdata); + ndev->netdev_ops = &xgene_ndev_ops; + xgene_enet_set_ethtool_ops(ndev); + ndev->features |= NETIF_F_IP_CSUM | + NETIF_F_GSO | + NETIF_F_GRO | + NETIF_F_SG; + + of_id = of_match_device(xgene_enet_of_match, &pdev->dev); + if (of_id) { + pdata->enet_id = (enum xgene_enet_id)of_id->data; + } +#ifdef CONFIG_ACPI + else { + const struct acpi_device_id *acpi_id; + + acpi_id = acpi_match_device(xgene_enet_acpi_match, &pdev->dev); + if (acpi_id) + pdata->enet_id = (enum xgene_enet_id) acpi_id->driver_data; + } +#endif + if (!pdata->enet_id) { + ret = -ENODEV; + goto err; + } + + ret = xgene_enet_get_resources(pdata); + if (ret) + goto err; + + xgene_enet_setup_ops(pdata); + spin_lock_init(&pdata->mac_lock); + + if (pdata->phy_mode == PHY_INTERFACE_MODE_XGMII) { + ndev->features |= NETIF_F_TSO | NETIF_F_RXCSUM; + spin_lock_init(&pdata->mss_lock); + } + ndev->hw_features = ndev->features; + + ret = dma_coerce_mask_and_coherent(dev, DMA_BIT_MASK(64)); + if (ret) { + netdev_err(ndev, "No usable DMA configuration\n"); + goto err; + } + + xgene_enet_check_phy_handle(pdata); + + ret = xgene_enet_init_hw(pdata); + if (ret) + goto err2; + + link_state = pdata->mac_ops->link_state; + if (pdata->phy_mode == PHY_INTERFACE_MODE_XGMII) { + INIT_DELAYED_WORK(&pdata->link_work, link_state); + } else if (!pdata->mdio_driver) { + if (phy_interface_mode_is_rgmii(pdata->phy_mode)) + ret = xgene_enet_mdio_config(pdata); + else + INIT_DELAYED_WORK(&pdata->link_work, link_state); + + if (ret) + goto err1; + } + + spin_lock_init(&pdata->stats_lock); + ret = xgene_extd_stats_init(pdata); + if (ret) + goto err1; + + xgene_enet_napi_add(pdata); + ret = register_netdev(ndev); + if (ret) { + netdev_err(ndev, "Failed to register netdev\n"); + goto err1; + } + + return 0; + +err1: + /* + * If necessary, free_netdev() will call netif_napi_del() and undo + * the effects of xgene_enet_napi_add()'s calls to netif_napi_add(). + */ + + xgene_enet_delete_desc_rings(pdata); + +err2: + if (pdata->mdio_driver) + xgene_enet_phy_disconnect(pdata); + else if (phy_interface_mode_is_rgmii(pdata->phy_mode)) + xgene_enet_mdio_remove(pdata); +err: + free_netdev(ndev); + return ret; +} + +static int xgene_enet_remove(struct platform_device *pdev) +{ + struct xgene_enet_pdata *pdata; + struct net_device *ndev; + + pdata = platform_get_drvdata(pdev); + ndev = pdata->ndev; + + rtnl_lock(); + if (netif_running(ndev)) + dev_close(ndev); + rtnl_unlock(); + + if (pdata->mdio_driver) + xgene_enet_phy_disconnect(pdata); + else if (phy_interface_mode_is_rgmii(pdata->phy_mode)) + xgene_enet_mdio_remove(pdata); + + unregister_netdev(ndev); + xgene_enet_delete_desc_rings(pdata); + pdata->port_ops->shutdown(pdata); + free_netdev(ndev); + + return 0; +} + +static void xgene_enet_shutdown(struct platform_device *pdev) +{ + struct xgene_enet_pdata *pdata; + + pdata = platform_get_drvdata(pdev); + if (!pdata) + return; + + if (!pdata->ndev) + return; + + xgene_enet_remove(pdev); +} + +static struct platform_driver xgene_enet_driver = { + .driver = { + .name = "xgene-enet", + .of_match_table = of_match_ptr(xgene_enet_of_match), + .acpi_match_table = ACPI_PTR(xgene_enet_acpi_match), + }, + .probe = xgene_enet_probe, + .remove = xgene_enet_remove, + .shutdown = xgene_enet_shutdown, +}; + +module_platform_driver(xgene_enet_driver); + +MODULE_DESCRIPTION("APM X-Gene SoC Ethernet driver"); +MODULE_AUTHOR("Iyappan Subramanian <isubramanian@apm.com>"); +MODULE_AUTHOR("Keyur Chudgar <kchudgar@apm.com>"); +MODULE_LICENSE("GPL"); |