diff options
author | 2015-08-04 12:17:53 -0700 | |
---|---|---|
committer | 2015-08-04 15:44:42 -0700 | |
commit | 9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00 (patch) | |
tree | 1c9cafbcd35f783a87880a10f85d1a060db1a563 /kernel/drivers/net/wireless/ath/wil6210/txrx.c | |
parent | 98260f3884f4a202f9ca5eabed40b1354c489b29 (diff) |
Add the rt linux 4.1.3-rt3 as base
Import the rt linux 4.1.3-rt3 as OPNFV kvm base.
It's from git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-4.1.y-rt and
the base is:
commit 0917f823c59692d751951bf5ea699a2d1e2f26a2
Author: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Date: Sat Jul 25 12:13:34 2015 +0200
Prepare v4.1.3-rt3
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
We lose all the git history this way and it's not good. We
should apply another opnfv project repo in future.
Change-Id: I87543d81c9df70d99c5001fbdf646b202c19f423
Signed-off-by: Yunhong Jiang <yunhong.jiang@intel.com>
Diffstat (limited to 'kernel/drivers/net/wireless/ath/wil6210/txrx.c')
-rw-r--r-- | kernel/drivers/net/wireless/ath/wil6210/txrx.c | 1453 |
1 files changed, 1453 insertions, 0 deletions
diff --git a/kernel/drivers/net/wireless/ath/wil6210/txrx.c b/kernel/drivers/net/wireless/ath/wil6210/txrx.c new file mode 100644 index 000000000..e8bd512d8 --- /dev/null +++ b/kernel/drivers/net/wireless/ath/wil6210/txrx.c @@ -0,0 +1,1453 @@ +/* + * Copyright (c) 2012-2014 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 <linux/ip.h> +#include <linux/ipv6.h> +#include <net/ipv6.h> +#include <linux/prefetch.h> + +#include "wil6210.h" +#include "wmi.h" +#include "txrx.h" +#include "trace.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"); + +bool rx_align_2; +module_param(rx_align_2, bool, S_IRUGO); +MODULE_PARM_DESC(rx_align_2, " align Rx buffers on 4*n+2, default - no"); + +static inline uint wil_rx_snaplen(void) +{ + return rx_align_2 ? 6 : 0; +} + +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; +} + +/* Used space in Tx Vring */ +static inline int wil_vring_used_tx(struct vring *vring) +{ + u32 swhead = vring->swhead; + u32 swtail = vring->swtail; + return (vring->size + swhead - swtail) % vring->size; +} + +/* Available space in Tx Vring */ +static inline int wil_vring_avail_tx(struct vring *vring) +{ + return vring->size - wil_vring_used_tx(vring) - 1; +} + +/* wil_vring_wmark_low - low watermark for available descriptor space */ +static inline int wil_vring_wmark_low(struct vring *vring) +{ + return vring->size/8; +} + +/* wil_vring_wmark_high - high watermark for available descriptor space */ +static inline int wil_vring_wmark_high(struct vring *vring) +{ + return vring->size/4; +} + +/* wil_val_in_range - check if value in [min,max) */ +static inline bool wil_val_in_range(int val, int min, int max) +{ + return val >= min && val < max; +} + +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; + + wil_dbg_misc(wil, "%s()\n", __func__); + + BUILD_BUG_ON(sizeof(vring->va[0]) != 32); + + vring->swhead = 0; + vring->swtail = 0; + vring->ctx = kcalloc(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) { + 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:%pad 0x%p\n", vring->size, + vring->va, &vring->pa, vring->ctx); + + return 0; +} + +static void wil_txdesc_unmap(struct device *dev, struct vring_tx_desc *d, + struct wil_ctx *ctx) +{ + dma_addr_t pa = wil_desc_addr(&d->dma.addr); + u16 dmalen = le16_to_cpu(d->dma.length); + + switch (ctx->mapped_as) { + case wil_mapped_as_single: + dma_unmap_single(dev, pa, dmalen, DMA_TO_DEVICE); + break; + case wil_mapped_as_page: + dma_unmap_page(dev, pa, dmalen, DMA_TO_DEVICE); + break; + default: + break; + } +} + +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]); + + if (tx) { + int vring_index = vring - wil->vring_tx; + + wil_dbg_misc(wil, "free Tx vring %d [%d] 0x%p:%pad 0x%p\n", + vring_index, vring->size, vring->va, + &vring->pa, vring->ctx); + } else { + wil_dbg_misc(wil, "free Rx vring [%d] 0x%p:%pad 0x%p\n", + vring->size, vring->va, + &vring->pa, vring->ctx); + } + + while (!wil_vring_is_empty(vring)) { + dma_addr_t pa; + u16 dmalen; + struct wil_ctx *ctx; + + if (tx) { + struct vring_tx_desc dd, *d = ⅆ + volatile struct vring_tx_desc *_d = + &vring->va[vring->swtail].tx; + + ctx = &vring->ctx[vring->swtail]; + *d = *_d; + wil_txdesc_unmap(dev, d, ctx); + if (ctx->skb) + dev_kfree_skb_any(ctx->skb); + vring->swtail = wil_vring_next_tail(vring); + } else { /* rx */ + struct vring_rx_desc dd, *d = ⅆ + volatile struct vring_rx_desc *_d = + &vring->va[vring->swhead].rx; + + ctx = &vring->ctx[vring->swhead]; + *d = *_d; + pa = wil_desc_addr(&d->dma.addr); + dmalen = le16_to_cpu(d->dma.length); + dma_unmap_single(dev, pa, dmalen, DMA_FROM_DEVICE); + kfree_skb(ctx->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 = mtu_max + ETH_HLEN + wil_rx_snaplen(); + struct vring_rx_desc dd, *d = ⅆ + volatile struct vring_rx_desc *_d = &vring->va[i].rx; + dma_addr_t pa; + 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; + wil_desc_addr_set(&d->dma.addr, 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 = cpu_to_le16(sz); + *_d = *d; + vring->ctx[i].skb = 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) +{ + 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 vring_rx_desc *d = wil_skb_rxdesc(skb); + 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); + } +} + +/** + * reap 1 frame from @swhead + * + * Rx descriptor copied to skb->cb + * + * 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 vring_rx_desc *d; + struct sk_buff *skb; + dma_addr_t pa; + unsigned int snaplen = wil_rx_snaplen(); + unsigned int sz = mtu_max + ETH_HLEN + snaplen; + u16 dmalen; + u8 ftype; + int cid; + int i = (int)vring->swhead; + struct wil_net_stats *stats; + + BUILD_BUG_ON(sizeof(struct vring_rx_desc) > sizeof(skb->cb)); + + if (unlikely(wil_vring_is_empty(vring))) + return NULL; + + _d = &vring->va[i].rx; + if (unlikely(!(_d->dma.status & RX_DMA_STATUS_DU))) { + /* it is not error, we just reached end of Rx done area */ + return NULL; + } + + skb = vring->ctx[i].skb; + vring->ctx[i].skb = NULL; + wil_vring_advance_head(vring, 1); + if (!skb) { + wil_err(wil, "No Rx skb at [%d]\n", i); + return NULL; + } + d = wil_skb_rxdesc(skb); + *d = *_d; + pa = wil_desc_addr(&d->dma.addr); + + dma_unmap_single(dev, pa, sz, DMA_FROM_DEVICE); + dmalen = le16_to_cpu(d->dma.length); + + trace_wil6210_rx(i, d); + wil_dbg_txrx(wil, "Rx[%3d] : %d bytes\n", i, dmalen); + wil_hex_dump_txrx("Rx ", DUMP_PREFIX_NONE, 32, 4, + (const void *)d, sizeof(*d), false); + + if (unlikely(dmalen > sz)) { + wil_err(wil, "Rx size too large: %d bytes!\n", dmalen); + kfree_skb(skb); + return NULL; + } + skb_trim(skb, dmalen); + + prefetch(skb->data); + + wil_hex_dump_txrx("Rx ", DUMP_PREFIX_OFFSET, 16, 1, + skb->data, skb_headlen(skb), false); + + cid = wil_rxdesc_cid(d); + stats = &wil->sta[cid].stats; + 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); + + /* 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 (unlikely(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 (unlikely(skb->len < ETH_HLEN + snaplen)) { + wil_err(wil, "Short frame, len = %d\n", skb->len); + /* TODO: process it (i.e. BAR) */ + kfree_skb(skb); + return NULL; + } + + /* L4 IDENT is on when HW calculated checksum, check status + * and in case of error drop the packet + * higher stack layers will handle retransmission (if required) + */ + if (likely(d->dma.status & RX_DMA_STATUS_L4I)) { + /* L4 protocol identified, csum calculated */ + if (likely((d->dma.error & RX_DMA_ERROR_L4_ERR) == 0)) + skb->ip_summed = CHECKSUM_UNNECESSARY; + /* If HW reports bad checksum, let IP stack re-check it + * For example, HW don't understand Microsoft IP stack that + * mis-calculates TCP checksum - if it should be 0x0, + * it writes 0xffff in violation of RFC 1624 + */ + } + + if (snaplen) { + /* Packet layout + * +-------+-------+---------+------------+------+ + * | SA(6) | DA(6) | SNAP(6) | ETHTYPE(2) | DATA | + * +-------+-------+---------+------------+------+ + * Need to remove SNAP, shifting SA and DA forward + */ + memmove(skb->data + snaplen, skb->data, 2 * ETH_ALEN); + skb_pull(skb, snaplen); + } + + 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 (unlikely(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. + * Called in softirq context (NAPI poll). + */ +void wil_netif_rx_any(struct sk_buff *skb, struct net_device *ndev) +{ + gro_result_t rc = GRO_NORMAL; + struct wil6210_priv *wil = ndev_to_wil(ndev); + struct wireless_dev *wdev = wil_to_wdev(wil); + unsigned int len = skb->len; + struct vring_rx_desc *d = wil_skb_rxdesc(skb); + int cid = wil_rxdesc_cid(d); /* always 0..7, no need to check */ + struct ethhdr *eth = (void *)skb->data; + /* here looking for DA, not A1, thus Rxdesc's 'mcast' indication + * is not suitable, need to look at data + */ + int mcast = is_multicast_ether_addr(eth->h_dest); + struct wil_net_stats *stats = &wil->sta[cid].stats; + struct sk_buff *xmit_skb = NULL; + static const char * const gro_res_str[] = { + [GRO_MERGED] = "GRO_MERGED", + [GRO_MERGED_FREE] = "GRO_MERGED_FREE", + [GRO_HELD] = "GRO_HELD", + [GRO_NORMAL] = "GRO_NORMAL", + [GRO_DROP] = "GRO_DROP", + }; + + skb_orphan(skb); + + if (wdev->iftype == NL80211_IFTYPE_AP && !wil->ap_isolate) { + if (mcast) { + /* send multicast frames both to higher layers in + * local net stack and back to the wireless medium + */ + xmit_skb = skb_copy(skb, GFP_ATOMIC); + } else { + int xmit_cid = wil_find_cid(wil, eth->h_dest); + + if (xmit_cid >= 0) { + /* The destination station is associated to + * this AP (in this VLAN), so send the frame + * directly to it and do not pass it to local + * net stack. + */ + xmit_skb = skb; + skb = NULL; + } + } + } + if (xmit_skb) { + /* Send to wireless media and increase priority by 256 to + * keep the received priority instead of reclassifying + * the frame (see cfg80211_classify8021d). + */ + xmit_skb->dev = ndev; + xmit_skb->priority += 256; + xmit_skb->protocol = htons(ETH_P_802_3); + skb_reset_network_header(xmit_skb); + skb_reset_mac_header(xmit_skb); + wil_dbg_txrx(wil, "Rx -> Tx %d bytes\n", len); + dev_queue_xmit(xmit_skb); + } + + if (skb) { /* deliver to local stack */ + + skb->protocol = eth_type_trans(skb, ndev); + rc = napi_gro_receive(&wil->napi_rx, skb); + wil_dbg_txrx(wil, "Rx complete %d bytes => %s\n", + len, gro_res_str[rc]); + } + /* statistics. rc set to GRO_NORMAL for AP bridging */ + if (unlikely(rc == GRO_DROP)) { + ndev->stats.rx_dropped++; + stats->rx_dropped++; + wil_dbg_txrx(wil, "Rx drop %d bytes\n", len); + } else { + ndev->stats.rx_packets++; + stats->rx_packets++; + ndev->stats.rx_bytes += len; + stats->rx_bytes += len; + if (mcast) + ndev->stats.multicast++; + } +} + +/** + * Proceed all completed skb's from Rx VRING + * + * Safe to call from NAPI poll, i.e. softirq with interrupts enabled + */ +void wil_rx_handle(struct wil6210_priv *wil, int *quota) +{ + struct net_device *ndev = wil_to_ndev(wil); + struct vring *v = &wil->vring_rx; + struct sk_buff *skb; + + if (unlikely(!v->va)) { + wil_err(wil, "Rx IRQ while Rx not yet initialized\n"); + return; + } + wil_dbg_txrx(wil, "%s()\n", __func__); + while ((*quota > 0) && (NULL != (skb = wil_vring_reap_rx(wil, v)))) { + (*quota)--; + + 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); + wil_netif_rx_any(skb, ndev); + } else { + wil_rx_reorder(wil, skb); + } + } + wil_rx_refill(wil, v->size); +} + +int wil_rx_init(struct wil6210_priv *wil, u16 size) +{ + struct vring *vring = &wil->vring_rx; + int rc; + + wil_dbg_misc(wil, "%s()\n", __func__); + + if (vring->va) { + wil_err(wil, "Rx ring already allocated\n"); + return -EINVAL; + } + + vring->size = 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; + + wil_dbg_misc(wil, "%s()\n", __func__); + + 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(wil_mtu2macbuf(mtu_max)), + .ring_size = cpu_to_le16(size), + }, + .ringid = id, + .cidxtid = mk_cidxtid(cid, tid), + .encap_trans_type = WMI_VRING_ENC_TYPE_802_3, + .mac_ctrl = 0, + .to_resolution = 0, + .agg_max_wsize = 0, + .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]; + struct vring_tx_data *txdata = &wil->vring_tx_data[id]; + + wil_dbg_misc(wil, "%s() max_mpdu_size %d\n", __func__, + cmd.vring_cfg.tx_sw_ring.max_mpdu_size); + + if (vring->va) { + wil_err(wil, "Tx ring [%d] already allocated\n", id); + rc = -EINVAL; + goto out; + } + + memset(txdata, 0, sizeof(*txdata)); + spin_lock_init(&txdata->lock); + vring->size = size; + rc = wil_vring_alloc(wil, vring); + if (rc) + goto out; + + wil->vring2cid_tid[id][0] = cid; + wil->vring2cid_tid[id][1] = tid; + + cmd.vring_cfg.tx_sw_ring.ring_mem_base = cpu_to_le64(vring->pa); + + 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); + + txdata->enabled = 1; + if (wil->sta[cid].data_port_open && (agg_wsize >= 0)) + wil_addba_tx_request(wil, id, agg_wsize); + + return 0; + out_free: + wil_vring_free(wil, vring, 1); + out: + + return rc; +} + +int wil_vring_init_bcast(struct wil6210_priv *wil, int id, int size) +{ + int rc; + struct wmi_bcast_vring_cfg_cmd cmd = { + .action = cpu_to_le32(WMI_VRING_CMD_ADD), + .vring_cfg = { + .tx_sw_ring = { + .max_mpdu_size = + cpu_to_le16(wil_mtu2macbuf(mtu_max)), + .ring_size = cpu_to_le16(size), + }, + .ringid = id, + .encap_trans_type = WMI_VRING_ENC_TYPE_802_3, + }, + }; + struct { + struct wil6210_mbox_hdr_wmi wmi; + struct wmi_vring_cfg_done_event cmd; + } __packed reply; + struct vring *vring = &wil->vring_tx[id]; + struct vring_tx_data *txdata = &wil->vring_tx_data[id]; + + wil_dbg_misc(wil, "%s() max_mpdu_size %d\n", __func__, + cmd.vring_cfg.tx_sw_ring.max_mpdu_size); + + if (vring->va) { + wil_err(wil, "Tx ring [%d] already allocated\n", id); + rc = -EINVAL; + goto out; + } + + memset(txdata, 0, sizeof(*txdata)); + spin_lock_init(&txdata->lock); + vring->size = size; + rc = wil_vring_alloc(wil, vring); + if (rc) + goto out; + + wil->vring2cid_tid[id][0] = WIL6210_MAX_CID; /* CID */ + wil->vring2cid_tid[id][1] = 0; /* TID */ + + cmd.vring_cfg.tx_sw_ring.ring_mem_base = cpu_to_le64(vring->pa); + + rc = wmi_call(wil, WMI_BCAST_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); + + txdata->enabled = 1; + + 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]; + struct vring_tx_data *txdata = &wil->vring_tx_data[id]; + + WARN_ON(!mutex_is_locked(&wil->mutex)); + + if (!vring->va) + return; + + wil_dbg_misc(wil, "%s() id=%d\n", __func__, id); + + spin_lock_bh(&txdata->lock); + txdata->enabled = 0; /* no Tx can be in progress or start anew */ + spin_unlock_bh(&txdata->lock); + /* make sure NAPI won't touch this vring */ + if (test_bit(wil_status_napi_en, wil->status)) + napi_synchronize(&wil->napi_tx); + + wil_vring_free(wil, vring, 1); + memset(txdata, 0, sizeof(*txdata)); +} + +static struct vring *wil_find_tx_ucast(struct wil6210_priv *wil, + struct sk_buff *skb) +{ + int i; + struct ethhdr *eth = (void *)skb->data; + int cid = wil_find_cid(wil, eth->h_dest); + + if (cid < 0) + return NULL; + + if (!wil->sta[cid].data_port_open && + (skb->protocol != cpu_to_be16(ETH_P_PAE))) + return NULL; + + /* TODO: fix for multiple TID */ + for (i = 0; i < ARRAY_SIZE(wil->vring2cid_tid); i++) { + if (wil->vring2cid_tid[i][0] == cid) { + struct vring *v = &wil->vring_tx[i]; + + wil_dbg_txrx(wil, "%s(%pM) -> [%d]\n", + __func__, eth->h_dest, i); + if (v->va) { + return v; + } else { + wil_dbg_txrx(wil, "vring[%d] not valid\n", i); + return NULL; + } + } + } + + return NULL; +} + +static int wil_tx_vring(struct wil6210_priv *wil, struct vring *vring, + struct sk_buff *skb); + +static struct vring *wil_find_tx_vring_sta(struct wil6210_priv *wil, + struct sk_buff *skb) +{ + struct vring *v; + int i; + u8 cid; + + /* In the STA mode, it is expected to have only 1 VRING + * for the AP we connected to. + * find 1-st vring and see whether it is eligible for data + */ + for (i = 0; i < WIL6210_MAX_TX_RINGS; i++) { + v = &wil->vring_tx[i]; + if (!v->va) + continue; + + cid = wil->vring2cid_tid[i][0]; + if (cid >= WIL6210_MAX_CID) /* skip BCAST */ + continue; + + if (!wil->sta[cid].data_port_open && + (skb->protocol != cpu_to_be16(ETH_P_PAE))) + break; + + wil_dbg_txrx(wil, "Tx -> ring %d\n", i); + + return v; + } + + wil_dbg_txrx(wil, "Tx while no vrings active?\n"); + + return NULL; +} + +/* Use one of 2 strategies: + * + * 1. New (real broadcast): + * use dedicated broadcast vring + * 2. Old (pseudo-DMS): + * Find 1-st vring and return it; + * duplicate skb and send it to other active vrings; + * in all cases override dest address to unicast peer's address + * Use old strategy when new is not supported yet: + * - for PBSS + * - for secure link + */ +static struct vring *wil_find_tx_bcast_1(struct wil6210_priv *wil, + struct sk_buff *skb) +{ + struct vring *v; + int i = wil->bcast_vring; + + if (i < 0) + return NULL; + v = &wil->vring_tx[i]; + if (!v->va) + return NULL; + + return v; +} + +static void wil_set_da_for_vring(struct wil6210_priv *wil, + struct sk_buff *skb, int vring_index) +{ + struct ethhdr *eth = (void *)skb->data; + int cid = wil->vring2cid_tid[vring_index][0]; + + ether_addr_copy(eth->h_dest, wil->sta[cid].addr); +} + +static struct vring *wil_find_tx_bcast_2(struct wil6210_priv *wil, + struct sk_buff *skb) +{ + struct vring *v, *v2; + struct sk_buff *skb2; + int i; + u8 cid; + struct ethhdr *eth = (void *)skb->data; + char *src = eth->h_source; + + /* find 1-st vring eligible for data */ + for (i = 0; i < WIL6210_MAX_TX_RINGS; i++) { + v = &wil->vring_tx[i]; + if (!v->va) + continue; + + cid = wil->vring2cid_tid[i][0]; + if (cid >= WIL6210_MAX_CID) /* skip BCAST */ + continue; + if (!wil->sta[cid].data_port_open) + continue; + + /* don't Tx back to source when re-routing Rx->Tx at the AP */ + if (0 == memcmp(wil->sta[cid].addr, src, ETH_ALEN)) + continue; + + goto found; + } + + wil_dbg_txrx(wil, "Tx while no vrings active?\n"); + + return NULL; + +found: + wil_dbg_txrx(wil, "BCAST -> ring %d\n", i); + wil_set_da_for_vring(wil, skb, i); + + /* find other active vrings and duplicate skb for each */ + for (i++; i < WIL6210_MAX_TX_RINGS; i++) { + v2 = &wil->vring_tx[i]; + if (!v2->va) + continue; + cid = wil->vring2cid_tid[i][0]; + if (cid >= WIL6210_MAX_CID) /* skip BCAST */ + continue; + if (!wil->sta[cid].data_port_open) + continue; + + if (0 == memcmp(wil->sta[cid].addr, src, ETH_ALEN)) + continue; + + skb2 = skb_copy(skb, GFP_ATOMIC); + if (skb2) { + wil_dbg_txrx(wil, "BCAST DUP -> ring %d\n", i); + wil_set_da_for_vring(wil, skb2, i); + wil_tx_vring(wil, v2, skb2); + } else { + wil_err(wil, "skb_copy failed\n"); + } + } + + return v; +} + +static struct vring *wil_find_tx_bcast(struct wil6210_priv *wil, + struct sk_buff *skb) +{ + struct wireless_dev *wdev = wil->wdev; + + if (wdev->iftype != NL80211_IFTYPE_AP) + return wil_find_tx_bcast_2(wil, skb); + + if (wil->privacy) + return wil_find_tx_bcast_2(wil, skb); + + return wil_find_tx_bcast_1(wil, skb); +} + +static int wil_tx_desc_map(struct vring_tx_desc *d, dma_addr_t pa, u32 len, + int vring_index) +{ + wil_desc_addr_set(&d->dma.addr, 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 = cpu_to_le16((u16)len); + d->dma.d0 = (vring_index << DMA_CFG_DESC_TX_0_QID_POS); + d->mac.d[0] = 0; + d->mac.d[1] = 0; + d->mac.d[2] = 0; + d->mac.ucode_cmd = 0; + /* 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 inline +void wil_tx_desc_set_nr_frags(struct vring_tx_desc *d, int nr_frags) +{ + d->mac.d[2] |= ((nr_frags + 1) << + MAC_CFG_DESC_TX_2_NUM_OF_DESCRIPTORS_POS); +} + +static int wil_tx_desc_offload_cksum_set(struct wil6210_priv *wil, + struct vring_tx_desc *d, + struct sk_buff *skb) +{ + int protocol; + + if (skb->ip_summed != CHECKSUM_PARTIAL) + return 0; + + d->dma.b11 = ETH_HLEN; /* MAC header length */ + + switch (skb->protocol) { + case cpu_to_be16(ETH_P_IP): + protocol = ip_hdr(skb)->protocol; + d->dma.b11 |= BIT(DMA_CFG_DESC_TX_OFFLOAD_CFG_L3T_IPV4_POS); + break; + case cpu_to_be16(ETH_P_IPV6): + protocol = ipv6_hdr(skb)->nexthdr; + break; + default: + return -EINVAL; + } + + switch (protocol) { + case IPPROTO_TCP: + d->dma.d0 |= (2 << DMA_CFG_DESC_TX_0_L4_TYPE_POS); + /* L4 header len: TCP header length */ + d->dma.d0 |= + (tcp_hdrlen(skb) & DMA_CFG_DESC_TX_0_L4_LENGTH_MSK); + break; + case IPPROTO_UDP: + /* L4 header len: UDP header length */ + d->dma.d0 |= + (sizeof(struct udphdr) & DMA_CFG_DESC_TX_0_L4_LENGTH_MSK); + break; + default: + return -EINVAL; + } + + d->dma.ip_length = skb_network_header_len(skb); + /* Enable TCP/UDP checksum */ + d->dma.d0 |= BIT(DMA_CFG_DESC_TX_0_TCP_UDP_CHECKSUM_EN_POS); + /* Calculate pseudo-header */ + d->dma.d0 |= BIT(DMA_CFG_DESC_TX_0_PSEUDO_HEADER_CALC_EN_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); + struct vring_tx_desc dd, *d = ⅆ + 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 = 0; + int vring_index = vring - wil->vring_tx; + struct vring_tx_data *txdata = &wil->vring_tx_data[vring_index]; + uint i = swhead; + dma_addr_t pa; + int used; + bool mcast = (vring_index == wil->bcast_vring); + uint len = skb_headlen(skb); + + wil_dbg_txrx(wil, "%s()\n", __func__); + + if (unlikely(!txdata->enabled)) + return -EINVAL; + + if (unlikely(avail < 1 + nr_frags)) { + wil_err_ratelimited(wil, + "Tx ring[%2d] full. No space for %d fragments\n", + vring_index, 1 + nr_frags); + return -ENOMEM; + } + _d = &vring->va[i].tx; + + pa = dma_map_single(dev, skb->data, skb_headlen(skb), DMA_TO_DEVICE); + + wil_dbg_txrx(wil, "Tx[%2d] skb %d bytes 0x%p -> %pad\n", vring_index, + skb_headlen(skb), skb->data, &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; + vring->ctx[i].mapped_as = wil_mapped_as_single; + /* 1-st segment */ + wil_tx_desc_map(d, pa, len, vring_index); + if (unlikely(mcast)) { + d->mac.d[0] |= BIT(MAC_CFG_DESC_TX_0_MCS_EN_POS); /* MCS 0 */ + if (unlikely(len > WIL_BCAST_MCS0_LIMIT)) { + /* set MCS 1 */ + d->mac.d[0] |= (1 << MAC_CFG_DESC_TX_0_MCS_INDEX_POS); + /* packet mode 2 */ + d->mac.d[1] |= BIT(MAC_CFG_DESC_TX_1_PKT_MODE_EN_POS) | + (2 << MAC_CFG_DESC_TX_1_PKT_MODE_POS); + } + } + /* Process TCP/UDP checksum offloading */ + if (unlikely(wil_tx_desc_offload_cksum_set(wil, d, skb))) { + wil_err(wil, "Tx[%2d] Failed to set cksum, drop packet\n", + vring_index); + goto dma_error; + } + + vring->ctx[i].nr_frags = nr_frags; + wil_tx_desc_set_nr_frags(d, nr_frags); + + /* middle segments */ + for (; f < nr_frags; f++) { + const struct skb_frag_struct *frag = + &skb_shinfo(skb)->frags[f]; + int len = skb_frag_size(frag); + + *_d = *d; + wil_dbg_txrx(wil, "Tx[%2d] desc[%4d]\n", vring_index, i); + wil_hex_dump_txrx("TxD ", DUMP_PREFIX_NONE, 32, 4, + (const void *)d, sizeof(*d), false); + 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; + vring->ctx[i].mapped_as = wil_mapped_as_page; + wil_tx_desc_map(d, pa, len, vring_index); + /* no need to check return code - + * if it succeeded for 1-st descriptor, + * it will succeed here too + */ + wil_tx_desc_offload_cksum_set(wil, d, skb); + } + /* for the last seg only */ + d->dma.d0 |= BIT(DMA_CFG_DESC_TX_0_CMD_EOP_POS); + d->dma.d0 |= BIT(DMA_CFG_DESC_TX_0_CMD_MARK_WB_POS); + d->dma.d0 |= BIT(DMA_CFG_DESC_TX_0_CMD_DMA_IT_POS); + *_d = *d; + wil_dbg_txrx(wil, "Tx[%2d] desc[%4d]\n", vring_index, i); + wil_hex_dump_txrx("TxD ", DUMP_PREFIX_NONE, 32, 4, + (const void *)d, sizeof(*d), false); + + /* hold reference to skb + * to prevent skb release before accounting + * in case of immediate "tx done" + */ + vring->ctx[i].skb = skb_get(skb); + + /* performance monitoring */ + used = wil_vring_used_tx(vring); + if (wil_val_in_range(vring_idle_trsh, + used, used + nr_frags + 1)) { + txdata->idle += get_cycles() - txdata->last_idle; + wil_dbg_txrx(wil, "Ring[%2d] not idle %d -> %d\n", + vring_index, used, used + nr_frags + 1); + } + + /* advance swhead */ + wil_vring_advance_head(vring, nr_frags + 1); + wil_dbg_txrx(wil, "Tx[%2d] swhead %d -> %d\n", vring_index, swhead, + vring->swhead); + trace_wil6210_tx(vring_index, swhead, skb->len, nr_frags); + iowrite32(vring->swhead, wil->csr + HOSTADDR(vring->hwtail)); + + return 0; + dma_error: + /* unmap what we have mapped */ + nr_frags = f + 1; /* frags mapped + one for skb head */ + for (f = 0; f < nr_frags; f++) { + struct wil_ctx *ctx; + + i = (swhead + f) % vring->size; + ctx = &vring->ctx[i]; + _d = &vring->va[i].tx; + *d = *_d; + _d->dma.status = TX_DMA_STATUS_DU; + wil_txdesc_unmap(dev, d, ctx); + + if (ctx->skb) + dev_kfree_skb_any(ctx->skb); + + memset(ctx, 0, sizeof(*ctx)); + } + + return -EINVAL; +} + +static int wil_tx_vring(struct wil6210_priv *wil, struct vring *vring, + struct sk_buff *skb) +{ + int vring_index = vring - wil->vring_tx; + struct vring_tx_data *txdata = &wil->vring_tx_data[vring_index]; + int rc; + + spin_lock(&txdata->lock); + rc = __wil_tx_vring(wil, vring, skb); + spin_unlock(&txdata->lock); + return rc; +} + +netdev_tx_t wil_start_xmit(struct sk_buff *skb, struct net_device *ndev) +{ + struct wil6210_priv *wil = ndev_to_wil(ndev); + struct ethhdr *eth = (void *)skb->data; + bool bcast = is_multicast_ether_addr(eth->h_dest); + struct vring *vring; + static bool pr_once_fw; + int rc; + + wil_dbg_txrx(wil, "%s()\n", __func__); + if (unlikely(!test_bit(wil_status_fwready, wil->status))) { + if (!pr_once_fw) { + wil_err(wil, "FW not ready\n"); + pr_once_fw = true; + } + goto drop; + } + if (unlikely(!test_bit(wil_status_fwconnected, wil->status))) { + wil_err(wil, "FW not connected\n"); + goto drop; + } + if (unlikely(wil->wdev->iftype == NL80211_IFTYPE_MONITOR)) { + wil_err(wil, "Xmit in monitor mode not supported\n"); + goto drop; + } + pr_once_fw = false; + + /* find vring */ + if (wil->wdev->iftype == NL80211_IFTYPE_STATION) { + /* in STA mode (ESS), all to same VRING */ + vring = wil_find_tx_vring_sta(wil, skb); + } else { /* direct communication, find matching VRING */ + vring = bcast ? wil_find_tx_bcast(wil, skb) : + wil_find_tx_ucast(wil, skb); + } + if (unlikely(!vring)) { + wil_dbg_txrx(wil, "No Tx VRING found for %pM\n", eth->h_dest); + goto drop; + } + /* set up vring entry */ + rc = wil_tx_vring(wil, vring, skb); + + /* do we still have enough room in the vring? */ + if (unlikely(wil_vring_avail_tx(vring) < wil_vring_wmark_low(vring))) { + netif_tx_stop_all_queues(wil_to_ndev(wil)); + wil_dbg_txrx(wil, "netif_tx_stop : ring full\n"); + } + + 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: + ndev->stats.tx_dropped++; + dev_kfree_skb_any(skb); + + return NET_XMIT_DROP; +} + +static inline bool wil_need_txstat(struct sk_buff *skb) +{ + struct ethhdr *eth = (void *)skb->data; + + return is_unicast_ether_addr(eth->h_dest) && skb->sk && + (skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS); +} + +static inline void wil_consume_skb(struct sk_buff *skb, bool acked) +{ + if (unlikely(wil_need_txstat(skb))) + skb_complete_wifi_ack(skb, acked); + else + acked ? dev_consume_skb_any(skb) : dev_kfree_skb_any(skb); +} + +/** + * Clean up transmitted skb's from the Tx VRING + * + * Return number of descriptors cleared + * + * Safe to call from IRQ + */ +int 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]; + struct vring_tx_data *txdata = &wil->vring_tx_data[ringid]; + int done = 0; + int cid = wil->vring2cid_tid[ringid][0]; + struct wil_net_stats *stats = NULL; + volatile struct vring_tx_desc *_d; + int used_before_complete; + int used_new; + + if (unlikely(!vring->va)) { + wil_err(wil, "Tx irq[%d]: vring not initialized\n", ringid); + return 0; + } + + if (unlikely(!txdata->enabled)) { + wil_info(wil, "Tx irq[%d]: vring disabled\n", ringid); + return 0; + } + + wil_dbg_txrx(wil, "%s(%d)\n", __func__, ringid); + + used_before_complete = wil_vring_used_tx(vring); + + if (cid < WIL6210_MAX_CID) + stats = &wil->sta[cid].stats; + + while (!wil_vring_is_empty(vring)) { + int new_swtail; + struct wil_ctx *ctx = &vring->ctx[vring->swtail]; + /** + * For the fragmented skb, HW will set DU bit only for the + * last fragment. look for it + */ + int lf = (vring->swtail + ctx->nr_frags) % vring->size; + /* TODO: check we are not past head */ + + _d = &vring->va[lf].tx; + if (unlikely(!(_d->dma.status & TX_DMA_STATUS_DU))) + break; + + new_swtail = (lf + 1) % vring->size; + while (vring->swtail != new_swtail) { + struct vring_tx_desc dd, *d = ⅆ + u16 dmalen; + struct sk_buff *skb; + + ctx = &vring->ctx[vring->swtail]; + skb = ctx->skb; + _d = &vring->va[vring->swtail].tx; + + *d = *_d; + + dmalen = le16_to_cpu(d->dma.length); + trace_wil6210_tx_done(ringid, vring->swtail, dmalen, + d->dma.error); + wil_dbg_txrx(wil, + "TxC[%2d][%3d] : %d bytes, status 0x%02x err 0x%02x\n", + ringid, vring->swtail, dmalen, + d->dma.status, d->dma.error); + wil_hex_dump_txrx("TxCD ", DUMP_PREFIX_NONE, 32, 4, + (const void *)d, sizeof(*d), false); + + wil_txdesc_unmap(dev, d, ctx); + + if (skb) { + if (likely(d->dma.error == 0)) { + ndev->stats.tx_packets++; + ndev->stats.tx_bytes += skb->len; + if (stats) { + stats->tx_packets++; + stats->tx_bytes += skb->len; + } + } else { + ndev->stats.tx_errors++; + if (stats) + stats->tx_errors++; + } + wil_consume_skb(skb, d->dma.error == 0); + } + memset(ctx, 0, sizeof(*ctx)); + /* There is no need to touch HW descriptor: + * - ststus bit TX_DMA_STATUS_DU is set by design, + * so hardware will not try to process this desc., + * - rest of descriptor will be initialized on Tx. + */ + vring->swtail = wil_vring_next_tail(vring); + done++; + } + } + + /* performance monitoring */ + used_new = wil_vring_used_tx(vring); + if (wil_val_in_range(vring_idle_trsh, + used_new, used_before_complete)) { + wil_dbg_txrx(wil, "Ring[%2d] idle %d -> %d\n", + ringid, used_before_complete, used_new); + txdata->last_idle = get_cycles(); + } + + if (wil_vring_avail_tx(vring) > wil_vring_wmark_high(vring)) { + wil_dbg_txrx(wil, "netif_tx_wake : ring not full\n"); + netif_tx_wake_all_queues(wil_to_ndev(wil)); + } + + return done; +} |