| /* |
| * 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/etherdevice.h> |
| #include <net/ieee80211_radiotap.h> |
| #include <linux/if_arp.h> |
| #include <linux/moduleparam.h> |
| |
| #include "wil6210.h" |
| #include "wmi.h" |
| #include "txrx.h" |
| |
| static bool rtap_include_phy_info; |
| module_param(rtap_include_phy_info, bool, S_IRUGO); |
| MODULE_PARM_DESC(rtap_include_phy_info, |
| " Include PHY info in the radiotap header, default - no"); |
| |
| static inline int wil_vring_is_empty(struct vring *vring) |
| { |
| return vring->swhead == vring->swtail; |
| } |
| |
| static inline u32 wil_vring_next_tail(struct vring *vring) |
| { |
| return (vring->swtail + 1) % vring->size; |
| } |
| |
| static inline void wil_vring_advance_head(struct vring *vring, int n) |
| { |
| vring->swhead = (vring->swhead + n) % vring->size; |
| } |
| |
| static inline int wil_vring_is_full(struct vring *vring) |
| { |
| return wil_vring_next_tail(vring) == vring->swhead; |
| } |
| /* |
| * Available space in Tx Vring |
| */ |
| static inline int wil_vring_avail_tx(struct vring *vring) |
| { |
| u32 swhead = vring->swhead; |
| u32 swtail = vring->swtail; |
| int used = (vring->size + swhead - swtail) % vring->size; |
| |
| return vring->size - used - 1; |
| } |
| |
| static int wil_vring_alloc(struct wil6210_priv *wil, struct vring *vring) |
| { |
| struct device *dev = wil_to_dev(wil); |
| size_t sz = vring->size * sizeof(vring->va[0]); |
| uint i; |
| |
| BUILD_BUG_ON(sizeof(vring->va[0]) != 32); |
| |
| vring->swhead = 0; |
| vring->swtail = 0; |
| vring->ctx = kzalloc(vring->size * sizeof(vring->ctx[0]), GFP_KERNEL); |
| if (!vring->ctx) { |
| vring->va = NULL; |
| return -ENOMEM; |
| } |
| /* |
| * vring->va should be aligned on its size rounded up to power of 2 |
| * This is granted by the dma_alloc_coherent |
| */ |
| vring->va = dma_alloc_coherent(dev, sz, &vring->pa, GFP_KERNEL); |
| if (!vring->va) { |
| wil_err(wil, "vring_alloc [%d] failed to alloc DMA mem\n", |
| vring->size); |
| kfree(vring->ctx); |
| vring->ctx = NULL; |
| return -ENOMEM; |
| } |
| /* initially, all descriptors are SW owned |
| * For Tx and Rx, ownership bit is at the same location, thus |
| * we can use any |
| */ |
| for (i = 0; i < vring->size; i++) { |
| volatile struct vring_tx_desc *d = &(vring->va[i].tx); |
| d->dma.status = TX_DMA_STATUS_DU; |
| } |
| |
| wil_dbg_misc(wil, "vring[%d] 0x%p:0x%016llx 0x%p\n", vring->size, |
| vring->va, (unsigned long long)vring->pa, vring->ctx); |
| |
| return 0; |
| } |
| |
| static void wil_vring_free(struct wil6210_priv *wil, struct vring *vring, |
| int tx) |
| { |
| struct device *dev = wil_to_dev(wil); |
| size_t sz = vring->size * sizeof(vring->va[0]); |
| |
| while (!wil_vring_is_empty(vring)) { |
| if (tx) { |
| volatile struct vring_tx_desc *d = |
| &vring->va[vring->swtail].tx; |
| dma_addr_t pa = d->dma.addr_low | |
| ((u64)d->dma.addr_high << 32); |
| struct sk_buff *skb = vring->ctx[vring->swtail]; |
| if (skb) { |
| dma_unmap_single(dev, pa, d->dma.length, |
| DMA_TO_DEVICE); |
| dev_kfree_skb_any(skb); |
| vring->ctx[vring->swtail] = NULL; |
| } else { |
| dma_unmap_page(dev, pa, d->dma.length, |
| DMA_TO_DEVICE); |
| } |
| vring->swtail = wil_vring_next_tail(vring); |
| } else { /* rx */ |
| volatile struct vring_rx_desc *d = |
| &vring->va[vring->swtail].rx; |
| dma_addr_t pa = d->dma.addr_low | |
| ((u64)d->dma.addr_high << 32); |
| struct sk_buff *skb = vring->ctx[vring->swhead]; |
| dma_unmap_single(dev, pa, d->dma.length, |
| DMA_FROM_DEVICE); |
| kfree_skb(skb); |
| wil_vring_advance_head(vring, 1); |
| } |
| } |
| dma_free_coherent(dev, sz, (void *)vring->va, vring->pa); |
| kfree(vring->ctx); |
| vring->pa = 0; |
| vring->va = NULL; |
| vring->ctx = NULL; |
| } |
| |
| /** |
| * Allocate one skb for Rx VRING |
| * |
| * Safe to call from IRQ |
| */ |
| static int wil_vring_alloc_skb(struct wil6210_priv *wil, struct vring *vring, |
| u32 i, int headroom) |
| { |
| struct device *dev = wil_to_dev(wil); |
| unsigned int sz = RX_BUF_LEN; |
| volatile struct vring_rx_desc *d = &(vring->va[i].rx); |
| dma_addr_t pa; |
| |
| /* TODO align */ |
| struct sk_buff *skb = dev_alloc_skb(sz + headroom); |
| if (unlikely(!skb)) |
| return -ENOMEM; |
| |
| skb_reserve(skb, headroom); |
| skb_put(skb, sz); |
| |
| pa = dma_map_single(dev, skb->data, skb->len, DMA_FROM_DEVICE); |
| if (unlikely(dma_mapping_error(dev, pa))) { |
| kfree_skb(skb); |
| return -ENOMEM; |
| } |
| |
| d->dma.d0 = BIT(9) | RX_DMA_D0_CMD_DMA_IT; |
| d->dma.addr_low = lower_32_bits(pa); |
| d->dma.addr_high = (u16)upper_32_bits(pa); |
| /* ip_length don't care */ |
| /* b11 don't care */ |
| /* error don't care */ |
| d->dma.status = 0; /* BIT(0) should be 0 for HW_OWNED */ |
| d->dma.length = sz; |
| vring->ctx[i] = skb; |
| |
| return 0; |
| } |
| |
| /** |
| * Adds radiotap header |
| * |
| * Any error indicated as "Bad FCS" |
| * |
| * Vendor data for 04:ce:14-1 (Wilocity-1) consists of: |
| * - Rx descriptor: 32 bytes |
| * - Phy info |
| */ |
| static void wil_rx_add_radiotap_header(struct wil6210_priv *wil, |
| struct sk_buff *skb, |
| volatile struct vring_rx_desc *d) |
| { |
| struct wireless_dev *wdev = wil->wdev; |
| struct wil6210_rtap { |
| struct ieee80211_radiotap_header rthdr; |
| /* fields should be in the order of bits in rthdr.it_present */ |
| /* flags */ |
| u8 flags; |
| /* channel */ |
| __le16 chnl_freq __aligned(2); |
| __le16 chnl_flags; |
| /* MCS */ |
| u8 mcs_present; |
| u8 mcs_flags; |
| u8 mcs_index; |
| } __packed; |
| struct wil6210_rtap_vendor { |
| struct wil6210_rtap rtap; |
| /* vendor */ |
| u8 vendor_oui[3] __aligned(2); |
| u8 vendor_ns; |
| __le16 vendor_skip; |
| u8 vendor_data[0]; |
| } __packed; |
| struct wil6210_rtap_vendor *rtap_vendor; |
| int rtap_len = sizeof(struct wil6210_rtap); |
| int phy_length = 0; /* phy info header size, bytes */ |
| static char phy_data[128]; |
| struct ieee80211_channel *ch = wdev->preset_chandef.chan; |
| |
| if (rtap_include_phy_info) { |
| rtap_len = sizeof(*rtap_vendor) + sizeof(*d); |
| /* calculate additional length */ |
| if (d->dma.status & RX_DMA_STATUS_PHY_INFO) { |
| /** |
| * PHY info starts from 8-byte boundary |
| * there are 8-byte lines, last line may be partially |
| * written (HW bug), thus FW configures for last line |
| * to be excessive. Driver skips this last line. |
| */ |
| int len = min_t(int, 8 + sizeof(phy_data), |
| wil_rxdesc_phy_length(d)); |
| if (len > 8) { |
| void *p = skb_tail_pointer(skb); |
| void *pa = PTR_ALIGN(p, 8); |
| if (skb_tailroom(skb) >= len + (pa - p)) { |
| phy_length = len - 8; |
| memcpy(phy_data, pa, phy_length); |
| } |
| } |
| } |
| rtap_len += phy_length; |
| } |
| |
| if (skb_headroom(skb) < rtap_len && |
| pskb_expand_head(skb, rtap_len, 0, GFP_ATOMIC)) { |
| wil_err(wil, "Unable to expand headrom to %d\n", rtap_len); |
| return; |
| } |
| |
| rtap_vendor = (void *)skb_push(skb, rtap_len); |
| memset(rtap_vendor, 0, rtap_len); |
| |
| rtap_vendor->rtap.rthdr.it_version = PKTHDR_RADIOTAP_VERSION; |
| rtap_vendor->rtap.rthdr.it_len = cpu_to_le16(rtap_len); |
| rtap_vendor->rtap.rthdr.it_present = cpu_to_le32( |
| (1 << IEEE80211_RADIOTAP_FLAGS) | |
| (1 << IEEE80211_RADIOTAP_CHANNEL) | |
| (1 << IEEE80211_RADIOTAP_MCS)); |
| if (d->dma.status & RX_DMA_STATUS_ERROR) |
| rtap_vendor->rtap.flags |= IEEE80211_RADIOTAP_F_BADFCS; |
| |
| rtap_vendor->rtap.chnl_freq = cpu_to_le16(ch ? ch->center_freq : 58320); |
| rtap_vendor->rtap.chnl_flags = cpu_to_le16(0); |
| |
| rtap_vendor->rtap.mcs_present = IEEE80211_RADIOTAP_MCS_HAVE_MCS; |
| rtap_vendor->rtap.mcs_flags = 0; |
| rtap_vendor->rtap.mcs_index = wil_rxdesc_mcs(d); |
| |
| if (rtap_include_phy_info) { |
| rtap_vendor->rtap.rthdr.it_present |= cpu_to_le32(1 << |
| IEEE80211_RADIOTAP_VENDOR_NAMESPACE); |
| /* OUI for Wilocity 04:ce:14 */ |
| rtap_vendor->vendor_oui[0] = 0x04; |
| rtap_vendor->vendor_oui[1] = 0xce; |
| rtap_vendor->vendor_oui[2] = 0x14; |
| rtap_vendor->vendor_ns = 1; |
| /* Rx descriptor + PHY data */ |
| rtap_vendor->vendor_skip = cpu_to_le16(sizeof(*d) + |
| phy_length); |
| memcpy(rtap_vendor->vendor_data, (void *)d, sizeof(*d)); |
| memcpy(rtap_vendor->vendor_data + sizeof(*d), phy_data, |
| phy_length); |
| } |
| } |
| |
| /* |
| * Fast swap in place between 2 registers |
| */ |
| static void wil_swap_u16(u16 *a, u16 *b) |
| { |
| *a ^= *b; |
| *b ^= *a; |
| *a ^= *b; |
| } |
| |
| static void wil_swap_ethaddr(void *data) |
| { |
| struct ethhdr *eth = data; |
| u16 *s = (u16 *)eth->h_source; |
| u16 *d = (u16 *)eth->h_dest; |
| |
| wil_swap_u16(s++, d++); |
| wil_swap_u16(s++, d++); |
| wil_swap_u16(s, d); |
| } |
| |
| /** |
| * reap 1 frame from @swhead |
| * |
| * Safe to call from IRQ |
| */ |
| static struct sk_buff *wil_vring_reap_rx(struct wil6210_priv *wil, |
| struct vring *vring) |
| { |
| struct device *dev = wil_to_dev(wil); |
| struct net_device *ndev = wil_to_ndev(wil); |
| volatile struct vring_rx_desc *d; |
| struct sk_buff *skb; |
| dma_addr_t pa; |
| unsigned int sz = RX_BUF_LEN; |
| u8 ftype; |
| u8 ds_bits; |
| |
| if (wil_vring_is_empty(vring)) |
| return NULL; |
| |
| d = &(vring->va[vring->swhead].rx); |
| if (!(d->dma.status & RX_DMA_STATUS_DU)) { |
| /* it is not error, we just reached end of Rx done area */ |
| return NULL; |
| } |
| |
| pa = d->dma.addr_low | ((u64)d->dma.addr_high << 32); |
| skb = vring->ctx[vring->swhead]; |
| dma_unmap_single(dev, pa, sz, DMA_FROM_DEVICE); |
| skb_trim(skb, d->dma.length); |
| |
| wil->stats.last_mcs_rx = wil_rxdesc_mcs(d); |
| |
| /* use radiotap header only if required */ |
| if (ndev->type == ARPHRD_IEEE80211_RADIOTAP) |
| wil_rx_add_radiotap_header(wil, skb, d); |
| |
| wil_dbg_txrx(wil, "Rx[%3d] : %d bytes\n", vring->swhead, d->dma.length); |
| wil_hex_dump_txrx("Rx ", DUMP_PREFIX_NONE, 32, 4, |
| (const void *)d, sizeof(*d), false); |
| |
| wil_vring_advance_head(vring, 1); |
| |
| /* no extra checks if in sniffer mode */ |
| if (ndev->type != ARPHRD_ETHER) |
| return skb; |
| /* |
| * Non-data frames may be delivered through Rx DMA channel (ex: BAR) |
| * Driver should recognize it by frame type, that is found |
| * in Rx descriptor. If type is not data, it is 802.11 frame as is |
| */ |
| ftype = wil_rxdesc_ftype(d) << 2; |
| if (ftype != IEEE80211_FTYPE_DATA) { |
| wil_dbg_txrx(wil, "Non-data frame ftype 0x%08x\n", ftype); |
| /* TODO: process it */ |
| kfree_skb(skb); |
| return NULL; |
| } |
| |
| if (skb->len < ETH_HLEN) { |
| wil_err(wil, "Short frame, len = %d\n", skb->len); |
| /* TODO: process it (i.e. BAR) */ |
| kfree_skb(skb); |
| return NULL; |
| } |
| |
| ds_bits = wil_rxdesc_ds_bits(d); |
| if (ds_bits == 1) { |
| /* |
| * HW bug - in ToDS mode, i.e. Rx on AP side, |
| * addresses get swapped |
| */ |
| wil_swap_ethaddr(skb->data); |
| } |
| |
| return skb; |
| } |
| |
| /** |
| * allocate and fill up to @count buffers in rx ring |
| * buffers posted at @swtail |
| */ |
| static int wil_rx_refill(struct wil6210_priv *wil, int count) |
| { |
| struct net_device *ndev = wil_to_ndev(wil); |
| struct vring *v = &wil->vring_rx; |
| u32 next_tail; |
| int rc = 0; |
| int headroom = ndev->type == ARPHRD_IEEE80211_RADIOTAP ? |
| WIL6210_RTAP_SIZE : 0; |
| |
| for (; next_tail = wil_vring_next_tail(v), |
| (next_tail != v->swhead) && (count-- > 0); |
| v->swtail = next_tail) { |
| rc = wil_vring_alloc_skb(wil, v, v->swtail, headroom); |
| if (rc) { |
| wil_err(wil, "Error %d in wil_rx_refill[%d]\n", |
| rc, v->swtail); |
| break; |
| } |
| } |
| iowrite32(v->swtail, wil->csr + HOSTADDR(v->hwtail)); |
| |
| return rc; |
| } |
| |
| /* |
| * Pass Rx packet to the netif. Update statistics. |
| */ |
| static void wil_netif_rx_any(struct sk_buff *skb, struct net_device *ndev) |
| { |
| int rc; |
| unsigned int len = skb->len; |
| |
| skb_orphan(skb); |
| |
| if (in_interrupt()) |
| rc = netif_rx(skb); |
| else |
| rc = netif_rx_ni(skb); |
| |
| if (likely(rc == NET_RX_SUCCESS)) { |
| ndev->stats.rx_packets++; |
| ndev->stats.rx_bytes += len; |
| |
| } else { |
| ndev->stats.rx_dropped++; |
| } |
| } |
| |
| /** |
| * Proceed all completed skb's from Rx VRING |
| * |
| * Safe to call from IRQ |
| */ |
| void wil_rx_handle(struct wil6210_priv *wil) |
| { |
| struct net_device *ndev = wil_to_ndev(wil); |
| struct vring *v = &wil->vring_rx; |
| struct sk_buff *skb; |
| |
| if (!v->va) { |
| wil_err(wil, "Rx IRQ while Rx not yet initialized\n"); |
| return; |
| } |
| wil_dbg_txrx(wil, "%s()\n", __func__); |
| while (NULL != (skb = wil_vring_reap_rx(wil, v))) { |
| wil_hex_dump_txrx("Rx ", DUMP_PREFIX_OFFSET, 16, 1, |
| skb->data, skb_headlen(skb), false); |
| |
| if (wil->wdev->iftype == NL80211_IFTYPE_MONITOR) { |
| skb->dev = ndev; |
| skb_reset_mac_header(skb); |
| skb->ip_summed = CHECKSUM_UNNECESSARY; |
| skb->pkt_type = PACKET_OTHERHOST; |
| skb->protocol = htons(ETH_P_802_2); |
| |
| } else { |
| skb->protocol = eth_type_trans(skb, ndev); |
| } |
| |
| wil_netif_rx_any(skb, ndev); |
| } |
| wil_rx_refill(wil, v->size); |
| } |
| |
| int wil_rx_init(struct wil6210_priv *wil) |
| { |
| struct vring *vring = &wil->vring_rx; |
| int rc; |
| |
| vring->size = WIL6210_RX_RING_SIZE; |
| rc = wil_vring_alloc(wil, vring); |
| if (rc) |
| return rc; |
| |
| rc = wmi_rx_chain_add(wil, vring); |
| if (rc) |
| goto err_free; |
| |
| rc = wil_rx_refill(wil, vring->size); |
| if (rc) |
| goto err_free; |
| |
| return 0; |
| err_free: |
| wil_vring_free(wil, vring, 0); |
| |
| return rc; |
| } |
| |
| void wil_rx_fini(struct wil6210_priv *wil) |
| { |
| struct vring *vring = &wil->vring_rx; |
| |
| if (vring->va) |
| wil_vring_free(wil, vring, 0); |
| } |
| |
| int wil_vring_init_tx(struct wil6210_priv *wil, int id, int size, |
| int cid, int tid) |
| { |
| int rc; |
| struct wmi_vring_cfg_cmd cmd = { |
| .action = cpu_to_le32(WMI_VRING_CMD_ADD), |
| .vring_cfg = { |
| .tx_sw_ring = { |
| .max_mpdu_size = cpu_to_le16(TX_BUF_LEN), |
| }, |
| .ringid = id, |
| .cidxtid = (cid & 0xf) | ((tid & 0xf) << 4), |
| .encap_trans_type = WMI_VRING_ENC_TYPE_802_3, |
| .mac_ctrl = 0, |
| .to_resolution = 0, |
| .agg_max_wsize = 16, |
| .schd_params = { |
| .priority = cpu_to_le16(0), |
| .timeslot_us = cpu_to_le16(0xfff), |
| }, |
| }, |
| }; |
| struct { |
| struct wil6210_mbox_hdr_wmi wmi; |
| struct wmi_vring_cfg_done_event cmd; |
| } __packed reply; |
| struct vring *vring = &wil->vring_tx[id]; |
| |
| if (vring->va) { |
| wil_err(wil, "Tx ring [%d] already allocated\n", id); |
| rc = -EINVAL; |
| goto out; |
| } |
| |
| vring->size = size; |
| rc = wil_vring_alloc(wil, vring); |
| if (rc) |
| goto out; |
| |
| cmd.vring_cfg.tx_sw_ring.ring_mem_base = cpu_to_le64(vring->pa); |
| cmd.vring_cfg.tx_sw_ring.ring_size = cpu_to_le16(vring->size); |
| |
| rc = wmi_call(wil, WMI_VRING_CFG_CMDID, &cmd, sizeof(cmd), |
| WMI_VRING_CFG_DONE_EVENTID, &reply, sizeof(reply), 100); |
| if (rc) |
| goto out_free; |
| |
| if (reply.cmd.status != WMI_FW_STATUS_SUCCESS) { |
| wil_err(wil, "Tx config failed, status 0x%02x\n", |
| reply.cmd.status); |
| rc = -EINVAL; |
| goto out_free; |
| } |
| vring->hwtail = le32_to_cpu(reply.cmd.tx_vring_tail_ptr); |
| |
| return 0; |
| out_free: |
| wil_vring_free(wil, vring, 1); |
| out: |
| |
| return rc; |
| } |
| |
| void wil_vring_fini_tx(struct wil6210_priv *wil, int id) |
| { |
| struct vring *vring = &wil->vring_tx[id]; |
| |
| if (!vring->va) |
| return; |
| |
| wil_vring_free(wil, vring, 1); |
| } |
| |
| static struct vring *wil_find_tx_vring(struct wil6210_priv *wil, |
| struct sk_buff *skb) |
| { |
| struct vring *v = &wil->vring_tx[0]; |
| |
| if (v->va) |
| return v; |
| |
| return NULL; |
| } |
| |
| static int wil_tx_desc_map(volatile struct vring_tx_desc *d, |
| dma_addr_t pa, u32 len) |
| { |
| d->dma.addr_low = lower_32_bits(pa); |
| d->dma.addr_high = (u16)upper_32_bits(pa); |
| d->dma.ip_length = 0; |
| /* 0..6: mac_length; 7:ip_version 0-IP6 1-IP4*/ |
| d->dma.b11 = 0/*14 | BIT(7)*/; |
| d->dma.error = 0; |
| d->dma.status = 0; /* BIT(0) should be 0 for HW_OWNED */ |
| d->dma.length = len; |
| d->dma.d0 = 0; |
| d->mac.d[0] = 0; |
| d->mac.d[1] = 0; |
| d->mac.d[2] = 0; |
| d->mac.ucode_cmd = 0; |
| /* use dst index 0 */ |
| d->mac.d[1] |= BIT(MAC_CFG_DESC_TX_1_DST_INDEX_EN_POS) | |
| (0 << MAC_CFG_DESC_TX_1_DST_INDEX_POS); |
| /* translation type: 0 - bypass; 1 - 802.3; 2 - native wifi */ |
| d->mac.d[2] = BIT(MAC_CFG_DESC_TX_2_SNAP_HDR_INSERTION_EN_POS) | |
| (1 << MAC_CFG_DESC_TX_2_L2_TRANSLATION_TYPE_POS); |
| |
| return 0; |
| } |
| |
| static int wil_tx_vring(struct wil6210_priv *wil, struct vring *vring, |
| struct sk_buff *skb) |
| { |
| struct device *dev = wil_to_dev(wil); |
| volatile struct vring_tx_desc *d; |
| u32 swhead = vring->swhead; |
| int avail = wil_vring_avail_tx(vring); |
| int nr_frags = skb_shinfo(skb)->nr_frags; |
| uint f; |
| int vring_index = vring - wil->vring_tx; |
| uint i = swhead; |
| dma_addr_t pa; |
| |
| wil_dbg_txrx(wil, "%s()\n", __func__); |
| |
| if (avail < vring->size/8) |
| netif_tx_stop_all_queues(wil_to_ndev(wil)); |
| if (avail < 1 + nr_frags) { |
| wil_err(wil, "Tx ring full. No space for %d fragments\n", |
| 1 + nr_frags); |
| return -ENOMEM; |
| } |
| d = &(vring->va[i].tx); |
| |
| /* FIXME FW can accept only unicast frames for the peer */ |
| memcpy(skb->data, wil->dst_addr[vring_index], ETH_ALEN); |
| |
| pa = dma_map_single(dev, skb->data, |
| skb_headlen(skb), DMA_TO_DEVICE); |
| |
| wil_dbg_txrx(wil, "Tx skb %d bytes %p -> %#08llx\n", skb_headlen(skb), |
| skb->data, (unsigned long long)pa); |
| wil_hex_dump_txrx("Tx ", DUMP_PREFIX_OFFSET, 16, 1, |
| skb->data, skb_headlen(skb), false); |
| |
| if (unlikely(dma_mapping_error(dev, pa))) |
| return -EINVAL; |
| /* 1-st segment */ |
| wil_tx_desc_map(d, pa, skb_headlen(skb)); |
| d->mac.d[2] |= ((nr_frags + 1) << |
| MAC_CFG_DESC_TX_2_NUM_OF_DESCRIPTORS_POS); |
| /* middle segments */ |
| for (f = 0; f < nr_frags; f++) { |
| const struct skb_frag_struct *frag = |
| &skb_shinfo(skb)->frags[f]; |
| int len = skb_frag_size(frag); |
| i = (swhead + f + 1) % vring->size; |
| d = &(vring->va[i].tx); |
| pa = skb_frag_dma_map(dev, frag, 0, skb_frag_size(frag), |
| DMA_TO_DEVICE); |
| if (unlikely(dma_mapping_error(dev, pa))) |
| goto dma_error; |
| wil_tx_desc_map(d, pa, len); |
| vring->ctx[i] = NULL; |
| } |
| /* for the last seg only */ |
| d->dma.d0 |= BIT(DMA_CFG_DESC_TX_0_CMD_EOP_POS); |
| d->dma.d0 |= BIT(9); /* BUG: undocumented bit */ |
| d->dma.d0 |= BIT(DMA_CFG_DESC_TX_0_CMD_DMA_IT_POS); |
| d->dma.d0 |= (vring_index << DMA_CFG_DESC_TX_0_QID_POS); |
| |
| wil_hex_dump_txrx("Tx ", DUMP_PREFIX_NONE, 32, 4, |
| (const void *)d, sizeof(*d), false); |
| |
| /* advance swhead */ |
| wil_vring_advance_head(vring, nr_frags + 1); |
| wil_dbg_txrx(wil, "Tx swhead %d -> %d\n", swhead, vring->swhead); |
| iowrite32(vring->swhead, wil->csr + HOSTADDR(vring->hwtail)); |
| /* hold reference to skb |
| * to prevent skb release before accounting |
| * in case of immediate "tx done" |
| */ |
| vring->ctx[i] = skb_get(skb); |
| |
| return 0; |
| dma_error: |
| /* unmap what we have mapped */ |
| /* Note: increment @f to operate with positive index */ |
| for (f++; f > 0; f--) { |
| i = (swhead + f) % vring->size; |
| d = &(vring->va[i].tx); |
| d->dma.status = TX_DMA_STATUS_DU; |
| pa = d->dma.addr_low | ((u64)d->dma.addr_high << 32); |
| if (vring->ctx[i]) |
| dma_unmap_single(dev, pa, d->dma.length, DMA_TO_DEVICE); |
| else |
| dma_unmap_page(dev, pa, d->dma.length, DMA_TO_DEVICE); |
| } |
| |
| return -EINVAL; |
| } |
| |
| |
| netdev_tx_t wil_start_xmit(struct sk_buff *skb, struct net_device *ndev) |
| { |
| struct wil6210_priv *wil = ndev_to_wil(ndev); |
| struct vring *vring; |
| int rc; |
| |
| wil_dbg_txrx(wil, "%s()\n", __func__); |
| if (!test_bit(wil_status_fwready, &wil->status)) { |
| wil_err(wil, "FW not ready\n"); |
| goto drop; |
| } |
| if (!test_bit(wil_status_fwconnected, &wil->status)) { |
| wil_err(wil, "FW not connected\n"); |
| goto drop; |
| } |
| if (wil->wdev->iftype == NL80211_IFTYPE_MONITOR) { |
| wil_err(wil, "Xmit in monitor mode not supported\n"); |
| goto drop; |
| } |
| if (skb->protocol == cpu_to_be16(ETH_P_PAE)) { |
| rc = wmi_tx_eapol(wil, skb); |
| } else { |
| /* find vring */ |
| vring = wil_find_tx_vring(wil, skb); |
| if (!vring) { |
| wil_err(wil, "No Tx VRING available\n"); |
| goto drop; |
| } |
| /* set up vring entry */ |
| rc = wil_tx_vring(wil, vring, skb); |
| } |
| switch (rc) { |
| case 0: |
| /* statistics will be updated on the tx_complete */ |
| dev_kfree_skb_any(skb); |
| return NETDEV_TX_OK; |
| case -ENOMEM: |
| return NETDEV_TX_BUSY; |
| default: |
| break; /* goto drop; */ |
| } |
| drop: |
| netif_tx_stop_all_queues(ndev); |
| ndev->stats.tx_dropped++; |
| dev_kfree_skb_any(skb); |
| |
| return NET_XMIT_DROP; |
| } |
| |
| /** |
| * Clean up transmitted skb's from the Tx VRING |
| * |
| * Safe to call from IRQ |
| */ |
| void wil_tx_complete(struct wil6210_priv *wil, int ringid) |
| { |
| struct net_device *ndev = wil_to_ndev(wil); |
| struct device *dev = wil_to_dev(wil); |
| struct vring *vring = &wil->vring_tx[ringid]; |
| |
| if (!vring->va) { |
| wil_err(wil, "Tx irq[%d]: vring not initialized\n", ringid); |
| return; |
| } |
| |
| wil_dbg_txrx(wil, "%s(%d)\n", __func__, ringid); |
| |
| while (!wil_vring_is_empty(vring)) { |
| volatile struct vring_tx_desc *d = &vring->va[vring->swtail].tx; |
| dma_addr_t pa; |
| struct sk_buff *skb; |
| if (!(d->dma.status & TX_DMA_STATUS_DU)) |
| break; |
| |
| wil_dbg_txrx(wil, |
| "Tx[%3d] : %d bytes, status 0x%02x err 0x%02x\n", |
| vring->swtail, d->dma.length, d->dma.status, |
| d->dma.error); |
| wil_hex_dump_txrx("TxC ", DUMP_PREFIX_NONE, 32, 4, |
| (const void *)d, sizeof(*d), false); |
| |
| pa = d->dma.addr_low | ((u64)d->dma.addr_high << 32); |
| skb = vring->ctx[vring->swtail]; |
| if (skb) { |
| if (d->dma.error == 0) { |
| ndev->stats.tx_packets++; |
| ndev->stats.tx_bytes += skb->len; |
| } else { |
| ndev->stats.tx_errors++; |
| } |
| |
| dma_unmap_single(dev, pa, d->dma.length, DMA_TO_DEVICE); |
| dev_kfree_skb_any(skb); |
| vring->ctx[vring->swtail] = NULL; |
| } else { |
| dma_unmap_page(dev, pa, d->dma.length, DMA_TO_DEVICE); |
| } |
| d->dma.addr_low = 0; |
| d->dma.addr_high = 0; |
| d->dma.length = 0; |
| d->dma.status = TX_DMA_STATUS_DU; |
| vring->swtail = wil_vring_next_tail(vring); |
| } |
| if (wil_vring_avail_tx(vring) > vring->size/4) |
| netif_tx_wake_all_queues(wil_to_ndev(wil)); |
| } |