wireless: add new wil6210 802.11ad 60GHz driver
This adds support for the 60 GHz 802.11ad Wilocity card
through a new driver, wil6210. Wilocity implemented the
firmware, QCA maintains the device driver.
Currently supported:
- STA: with security
- AP: limited to 1 connected STA, security disabled
- Monitor: due to a hardware/firmware limitation
either control or non-control frames are monitored
Using a STA and AP with this drive, one can assemble
a fully functional BSS. Throughput of 1.2Gbps is achieved
with iperf.
The wil6210 cards have on-board flash memory for the
firmware, the cards comes pre-flashed and no firmware
download is required.
For more details see:
http://wireless.kernel.org/en/users/Drivers/wil6210
Signed-off-by: Vladimir Kondratiev <qca_vkondrat@qca.qualcomm.com>
Signed-off-by: Luis R. Rodriguez <mcgrof@qca.qualcomm.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/drivers/net/wireless/ath/wil6210/txrx.c b/drivers/net/wireless/ath/wil6210/txrx.c
new file mode 100644
index 0000000..f29c294
--- /dev/null
+++ b/drivers/net/wireless/ath/wil6210/txrx.c
@@ -0,0 +1,871 @@
+/*
+ * 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/kernel.h>
+#include <linux/netdevice.h>
+#include <linux/etherdevice.h>
+#include <linux/hardirq.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) {
+ wil_err(wil, "vring_alloc [%d] failed to alloc ctx mem\n",
+ vring->size);
+ 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(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;
+
+ 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);
+
+ skb_orphan(skb);
+
+ 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 net_device *ndev = wil_to_ndev(wil);
+ struct wireless_dev *wdev = wil->wdev;
+ struct vring *vring = &wil->vring_rx;
+ int rc;
+ struct wmi_cfg_rx_chain_cmd cmd = {
+ .action = WMI_RX_CHAIN_ADD,
+ .rx_sw_ring = {
+ .max_mpdu_size = cpu_to_le16(RX_BUF_LEN),
+ },
+ .mid = 0, /* TODO - what is it? */
+ .decap_trans_type = WMI_DECAP_TYPE_802_3,
+ };
+ struct {
+ struct wil6210_mbox_hdr_wmi wmi;
+ struct wmi_cfg_rx_chain_done_event evt;
+ } __packed evt;
+
+ vring->size = WIL6210_RX_RING_SIZE;
+ rc = wil_vring_alloc(wil, vring);
+ if (rc)
+ return rc;
+
+ cmd.rx_sw_ring.ring_mem_base = cpu_to_le64(vring->pa);
+ cmd.rx_sw_ring.ring_size = cpu_to_le16(vring->size);
+ if (wdev->iftype == NL80211_IFTYPE_MONITOR) {
+ struct ieee80211_channel *ch = wdev->preset_chandef.chan;
+
+ cmd.sniffer_cfg.mode = cpu_to_le32(WMI_SNIFFER_ON);
+ if (ch)
+ cmd.sniffer_cfg.channel = ch->hw_value - 1;
+ cmd.sniffer_cfg.phy_info_mode =
+ cpu_to_le32(ndev->type == ARPHRD_IEEE80211_RADIOTAP);
+ cmd.sniffer_cfg.phy_support =
+ cpu_to_le32((wil->monitor_flags & MONITOR_FLAG_CONTROL)
+ ? WMI_SNIFFER_CP : WMI_SNIFFER_DP);
+ }
+ /* typical time for secure PCP is 840ms */
+ rc = wmi_call(wil, WMI_CFG_RX_CHAIN_CMDID, &cmd, sizeof(cmd),
+ WMI_CFG_RX_CHAIN_DONE_EVENTID, &evt, sizeof(evt), 2000);
+ if (rc)
+ goto err_free;
+
+ vring->hwtail = le32_to_cpu(evt.evt.rx_ring_tail_ptr);
+
+ wil_dbg(wil, "Rx init: status %d tail 0x%08x\n",
+ le32_to_cpu(evt.evt.status), vring->hwtail);
+
+ 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) {
+ int rc;
+ struct wmi_cfg_rx_chain_cmd cmd = {
+ .action = cpu_to_le32(WMI_RX_CHAIN_DEL),
+ .rx_sw_ring = {
+ .max_mpdu_size = cpu_to_le16(RX_BUF_LEN),
+ },
+ };
+ struct {
+ struct wil6210_mbox_hdr_wmi wmi;
+ struct wmi_cfg_rx_chain_done_event cfg;
+ } __packed wmi_rx_cfg_reply;
+
+ rc = wmi_call(wil, WMI_CFG_RX_CHAIN_CMDID, &cmd, sizeof(cmd),
+ WMI_CFG_RX_CHAIN_DONE_EVENTID,
+ &wmi_rx_cfg_reply, sizeof(wmi_rx_cfg_reply),
+ 100);
+ 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_VRING_CFG_SUCCESS) {
+ wil_err(wil, "Tx config failed, status 0x%02x\n",
+ reply.cmd.status);
+ 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:
+ ndev->stats.tx_packets++;
+ ndev->stats.tx_bytes += skb->len;
+ dev_kfree_skb_any(skb);
+ return NETDEV_TX_OK;
+ case -ENOMEM:
+ return NETDEV_TX_BUSY;
+ default:
+ ; /* goto drop; */
+ break;
+ }
+ 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 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) {
+ 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));
+}