diff options
Diffstat (limited to 'drivers/net/wireless/ath/wil6210/txrx_edma.c')
| -rw-r--r-- | drivers/net/wireless/ath/wil6210/txrx_edma.c | 719 |
1 files changed, 719 insertions, 0 deletions
diff --git a/drivers/net/wireless/ath/wil6210/txrx_edma.c b/drivers/net/wireless/ath/wil6210/txrx_edma.c new file mode 100644 index 000000000000..9773d400808d --- /dev/null +++ b/drivers/net/wireless/ath/wil6210/txrx_edma.c @@ -0,0 +1,719 @@ +/* + * Copyright (c) 2012-2018 The Linux Foundation. All rights reserved. + * + * 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 <linux/moduleparam.h> +#include <linux/prefetch.h> +#include <linux/types.h> +#include <linux/list.h> +#include <linux/ip.h> +#include <linux/ipv6.h> +#include "wil6210.h" +#include "txrx_edma.h" +#include "txrx.h" + +#define WIL_EDMA_MAX_DATA_OFFSET (2) + +static void wil_tx_desc_unmap_edma(struct device *dev, + struct wil_tx_enhanced_desc *d, + struct wil_ctx *ctx) +{ + dma_addr_t pa = wil_tx_desc_get_addr_edma(&d->dma); + 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 int wil_find_free_sring(struct wil6210_priv *wil) +{ + int i; + + for (i = 0; i < WIL6210_MAX_STATUS_RINGS; i++) { + if (!wil->srings[i].va) + return i; + } + + return -EINVAL; +} + +static void wil_sring_free(struct wil6210_priv *wil, + struct wil_status_ring *sring) +{ + struct device *dev = wil_to_dev(wil); + size_t sz; + + if (!sring || !sring->va) + return; + + sz = sring->elem_size * sring->size; + + wil_dbg_misc(wil, "status_ring_free, size(bytes)=%zu, 0x%p:%pad\n", + sz, sring->va, &sring->pa); + + dma_free_coherent(dev, sz, (void *)sring->va, sring->pa); + sring->pa = 0; + sring->va = NULL; +} + +static int wil_sring_alloc(struct wil6210_priv *wil, + struct wil_status_ring *sring) +{ + struct device *dev = wil_to_dev(wil); + size_t sz = sring->elem_size * sring->size; + + wil_dbg_misc(wil, "status_ring_alloc: size=%zu\n", sz); + + if (sz == 0) { + wil_err(wil, "Cannot allocate a zero size status ring\n"); + return -EINVAL; + } + + sring->swhead = 0; + + /* Status messages are allocated and initialized to 0. This is necessary + * since DR bit should be initialized to 0. + */ + sring->va = dma_zalloc_coherent(dev, sz, &sring->pa, GFP_KERNEL); + if (!sring->va) + return -ENOMEM; + + wil_dbg_misc(wil, "status_ring[%d] 0x%p:%pad\n", sring->size, sring->va, + &sring->pa); + + return 0; +} + +static int wil_tx_init_edma(struct wil6210_priv *wil) +{ + int ring_id = wil_find_free_sring(wil); + struct wil_status_ring *sring; + int rc; + u16 status_ring_size; + + if (wil->tx_status_ring_order < WIL_SRING_SIZE_ORDER_MIN || + wil->tx_status_ring_order > WIL_SRING_SIZE_ORDER_MAX) + wil->tx_status_ring_order = WIL_TX_SRING_SIZE_ORDER_DEFAULT; + + status_ring_size = 1 << wil->tx_status_ring_order; + + wil_dbg_misc(wil, "init TX sring: size=%u, ring_id=%u\n", + status_ring_size, ring_id); + + if (ring_id < 0) + return ring_id; + + /* Allocate Tx status ring. Tx descriptor rings will be + * allocated on WMI connect event + */ + sring = &wil->srings[ring_id]; + + sring->is_rx = false; + sring->size = status_ring_size; + sring->elem_size = sizeof(struct wil_ring_tx_status); + rc = wil_sring_alloc(wil, sring); + if (rc) + return rc; + + rc = wil_wmi_tx_sring_cfg(wil, ring_id); + if (rc) + goto out_free; + + sring->desc_rdy_pol = 1; + wil->tx_sring_idx = ring_id; + + return 0; +out_free: + wil_sring_free(wil, sring); + return rc; +} + +/** + * Allocate one skb for Rx descriptor RING + */ +static int wil_ring_alloc_skb_edma(struct wil6210_priv *wil, + struct wil_ring *ring, u32 i) +{ + struct device *dev = wil_to_dev(wil); + unsigned int sz = wil->rx_buf_len + ETH_HLEN + + WIL_EDMA_MAX_DATA_OFFSET; + dma_addr_t pa; + u16 buff_id; + struct list_head *active = &wil->rx_buff_mgmt.active; + struct list_head *free = &wil->rx_buff_mgmt.free; + struct wil_rx_buff *rx_buff; + struct wil_rx_buff *buff_arr = wil->rx_buff_mgmt.buff_arr; + struct sk_buff *skb; + struct wil_rx_enhanced_desc dd, *d = ⅆ + struct wil_rx_enhanced_desc *_d = (struct wil_rx_enhanced_desc *) + &ring->va[i].rx.enhanced; + + if (unlikely(list_empty(free))) { + wil->rx_buff_mgmt.free_list_empty_cnt++; + return -EAGAIN; + } + + skb = dev_alloc_skb(sz); + if (unlikely(!skb)) + return -ENOMEM; + + 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; + } + + /* Get the buffer ID - the index of the rx buffer in the buff_arr */ + rx_buff = list_first_entry(free, struct wil_rx_buff, list); + buff_id = rx_buff->id; + + /* Move a buffer from the free list to the active list */ + list_move(&rx_buff->list, active); + + buff_arr[buff_id].skb = skb; + + wil_desc_set_addr_edma(&d->dma.addr, &d->dma.addr_high_high, pa); + d->dma.length = cpu_to_le16(sz); + d->mac.buff_id = cpu_to_le16(buff_id); + *_d = *d; + + /* Save the physical address in skb->cb for later use in dma_unmap */ + memcpy(skb->cb, &pa, sizeof(pa)); + + return 0; +} + +static int wil_rx_refill_edma(struct wil6210_priv *wil) +{ + struct wil_ring *ring = &wil->ring_rx; + u32 next_head; + int rc = 0; + u32 swtail = *ring->edma_rx_swtail.va; + + for (; next_head = wil_ring_next_head(ring), (next_head != swtail); + ring->swhead = next_head) { + rc = wil_ring_alloc_skb_edma(wil, ring, ring->swhead); + if (unlikely(rc)) { + if (rc == -EAGAIN) + wil_dbg_txrx(wil, "No free buffer ID found\n"); + else + wil_err_ratelimited(wil, + "Error %d in refill desc[%d]\n", + rc, ring->swhead); + break; + } + } + + /* make sure all writes to descriptors (shared memory) are done before + * committing them to HW + */ + wmb(); + + wil_w(wil, ring->hwtail, ring->swhead); + + return rc; +} + +static void wil_move_all_rx_buff_to_free_list(struct wil6210_priv *wil, + struct wil_ring *ring) +{ + struct device *dev = wil_to_dev(wil); + u32 next_tail; + u32 swhead = (ring->swhead + 1) % ring->size; + dma_addr_t pa; + u16 dmalen; + + for (; next_tail = wil_ring_next_tail(ring), (next_tail != swhead); + ring->swtail = next_tail) { + struct wil_rx_enhanced_desc dd, *d = ⅆ + struct wil_rx_enhanced_desc *_d = + (struct wil_rx_enhanced_desc *) + &ring->va[ring->swtail].rx.enhanced; + struct sk_buff *skb; + u16 buff_id; + + *d = *_d; + pa = wil_rx_desc_get_addr_edma(&d->dma); + dmalen = le16_to_cpu(d->dma.length); + dma_unmap_single(dev, pa, dmalen, DMA_FROM_DEVICE); + + /* Extract the SKB from the rx_buff management array */ + buff_id = __le16_to_cpu(d->mac.buff_id); + if (buff_id >= wil->rx_buff_mgmt.size) { + wil_err(wil, "invalid buff_id %d\n", buff_id); + continue; + } + skb = wil->rx_buff_mgmt.buff_arr[buff_id].skb; + wil->rx_buff_mgmt.buff_arr[buff_id].skb = NULL; + if (unlikely(!skb)) + wil_err(wil, "No Rx skb at buff_id %d\n", buff_id); + else + kfree_skb(skb); + + /* Move the buffer from the active to the free list */ + list_move(&wil->rx_buff_mgmt.buff_arr[buff_id].list, + &wil->rx_buff_mgmt.free); + } +} + +static void wil_free_rx_buff_arr(struct wil6210_priv *wil) +{ + struct wil_ring *ring = &wil->ring_rx; + + if (!wil->rx_buff_mgmt.buff_arr) + return; + + /* Move all the buffers to the free list in case active list is + * not empty in order to release all SKBs before deleting the array + */ + wil_move_all_rx_buff_to_free_list(wil, ring); + + kfree(wil->rx_buff_mgmt.buff_arr); + wil->rx_buff_mgmt.buff_arr = NULL; +} + +static int wil_init_rx_buff_arr(struct wil6210_priv *wil, + size_t size) +{ + struct wil_rx_buff *buff_arr; + struct list_head *active = &wil->rx_buff_mgmt.active; + struct list_head *free = &wil->rx_buff_mgmt.free; + int i; + + wil->rx_buff_mgmt.buff_arr = kcalloc(size, sizeof(struct wil_rx_buff), + GFP_KERNEL); + if (!wil->rx_buff_mgmt.buff_arr) + return -ENOMEM; + + /* Set list heads */ + INIT_LIST_HEAD(active); + INIT_LIST_HEAD(free); + + /* Linkify the list */ + buff_arr = wil->rx_buff_mgmt.buff_arr; + for (i = 0; i < size; i++) { + list_add(&buff_arr[i].list, free); + buff_arr[i].id = i; + } + + wil->rx_buff_mgmt.size = size; + + return 0; +} + +static int wil_init_rx_sring(struct wil6210_priv *wil, + u16 status_ring_size, + size_t elem_size, + u16 ring_id) +{ + struct wil_status_ring *sring = &wil->srings[ring_id]; + int rc; + + wil_dbg_misc(wil, "init RX sring: size=%u, ring_id=%u\n", sring->size, + ring_id); + + memset(&sring->rx_data, 0, sizeof(sring->rx_data)); + + sring->is_rx = true; + sring->size = status_ring_size; + sring->elem_size = elem_size; + rc = wil_sring_alloc(wil, sring); + if (rc) + return rc; + + rc = wil_wmi_rx_sring_add(wil, ring_id); + if (rc) + goto out_free; + + sring->desc_rdy_pol = 1; + + return 0; +out_free: + wil_sring_free(wil, sring); + return rc; +} + +static int wil_ring_alloc_desc_ring(struct wil6210_priv *wil, + struct wil_ring *ring) +{ + struct device *dev = wil_to_dev(wil); + size_t sz = ring->size * sizeof(ring->va[0]); + + wil_dbg_misc(wil, "alloc_desc_ring:\n"); + + BUILD_BUG_ON(sizeof(ring->va[0]) != 32); + + ring->swhead = 0; + ring->swtail = 0; + ring->ctx = kcalloc(ring->size, sizeof(ring->ctx[0]), GFP_KERNEL); + if (!ring->ctx) + goto err; + + ring->va = dma_zalloc_coherent(dev, sz, &ring->pa, GFP_KERNEL); + if (!ring->va) + goto err_free_ctx; + + if (ring->is_rx) { + sz = sizeof(*ring->edma_rx_swtail.va); + ring->edma_rx_swtail.va = + dma_zalloc_coherent(dev, sz, &ring->edma_rx_swtail.pa, + GFP_KERNEL); + if (!ring->edma_rx_swtail.va) + goto err_free_va; + } + + wil_dbg_misc(wil, "%s ring[%d] 0x%p:%pad 0x%p\n", + ring->is_rx ? "RX" : "TX", + ring->size, ring->va, &ring->pa, ring->ctx); + + return 0; +err_free_va: + dma_free_coherent(dev, ring->size * sizeof(ring->va[0]), + (void *)ring->va, ring->pa); + ring->va = NULL; +err_free_ctx: + kfree(ring->ctx); + ring->ctx = NULL; +err: + return -ENOMEM; +} + +static void wil_ring_free_edma(struct wil6210_priv *wil, struct wil_ring *ring) +{ + struct device *dev = wil_to_dev(wil); + size_t sz; + int ring_index = 0; + + if (!ring->va) + return; + + sz = ring->size * sizeof(ring->va[0]); + + lockdep_assert_held(&wil->mutex); + if (ring->is_rx) { + wil_dbg_misc(wil, "free Rx ring [%d] 0x%p:%pad 0x%p\n", + ring->size, ring->va, + &ring->pa, ring->ctx); + + wil_move_all_rx_buff_to_free_list(wil, ring); + goto out; + } + + /* TX ring */ + ring_index = ring - wil->ring_tx; + + wil_dbg_misc(wil, "free Tx ring %d [%d] 0x%p:%pad 0x%p\n", + ring_index, ring->size, ring->va, + &ring->pa, ring->ctx); + + while (!wil_ring_is_empty(ring)) { + struct wil_ctx *ctx; + + struct wil_tx_enhanced_desc dd, *d = ⅆ + struct wil_tx_enhanced_desc *_d = + (struct wil_tx_enhanced_desc *) + &ring->va[ring->swtail].tx.enhanced; + + ctx = &ring->ctx[ring->swtail]; + if (!ctx) { + wil_dbg_txrx(wil, + "ctx(%d) was already completed\n", + ring->swtail); + ring->swtail = wil_ring_next_tail(ring); + continue; + } + *d = *_d; + wil_tx_desc_unmap_edma(dev, d, ctx); + if (ctx->skb) + dev_kfree_skb_any(ctx->skb); + ring->swtail = wil_ring_next_tail(ring); + } + +out: + dma_free_coherent(dev, sz, (void *)ring->va, ring->pa); + kfree(ring->ctx); + ring->pa = 0; + ring->va = NULL; + ring->ctx = NULL; +} + +static int wil_init_rx_desc_ring(struct wil6210_priv *wil, u16 desc_ring_size, + int status_ring_id) +{ + struct wil_ring *ring = &wil->ring_rx; + int rc; + + wil_dbg_misc(wil, "init RX desc ring\n"); + + ring->size = desc_ring_size; + ring->is_rx = true; + rc = wil_ring_alloc_desc_ring(wil, ring); + if (rc) + return rc; + + rc = wil_wmi_rx_desc_ring_add(wil, status_ring_id); + if (rc) + goto out_free; + + return 0; +out_free: + wil_ring_free_edma(wil, ring); + return rc; +} + +static void wil_rx_buf_len_init_edma(struct wil6210_priv *wil) +{ + wil->rx_buf_len = rx_large_buf ? + WIL_MAX_ETH_MTU : TXRX_BUF_LEN_DEFAULT - WIL_MAX_MPDU_OVERHEAD; +} + +static int wil_rx_init_edma(struct wil6210_priv *wil, u16 desc_ring_size) +{ + u16 status_ring_size; + struct wil_ring *ring = &wil->ring_rx; + int rc; + size_t elem_size = wil->use_compressed_rx_status ? + sizeof(struct wil_rx_status_compressed) : + sizeof(struct wil_rx_status_extended); + int i; + u16 max_rx_pl_per_desc; + + if (wil->rx_status_ring_order < WIL_SRING_SIZE_ORDER_MIN || + wil->rx_status_ring_order > WIL_SRING_SIZE_ORDER_MAX) + wil->rx_status_ring_order = WIL_RX_SRING_SIZE_ORDER_DEFAULT; + + status_ring_size = 1 << wil->rx_status_ring_order; + + wil_dbg_misc(wil, + "rx_init, desc_ring_size=%u, status_ring_size=%u, elem_size=%zu\n", + desc_ring_size, status_ring_size, elem_size); + + wil_rx_buf_len_init_edma(wil); + + max_rx_pl_per_desc = wil->rx_buf_len + ETH_HLEN + + WIL_EDMA_MAX_DATA_OFFSET; + + /* Use debugfs dbg_num_rx_srings if set, reserve one sring for TX */ + if (wil->num_rx_status_rings > WIL6210_MAX_STATUS_RINGS - 1) + wil->num_rx_status_rings = WIL6210_MAX_STATUS_RINGS - 1; + + wil_dbg_misc(wil, "rx_init: allocate %d status rings\n", + wil->num_rx_status_rings); + + rc = wil_wmi_cfg_def_rx_offload(wil, max_rx_pl_per_desc); + if (rc) + return rc; + + /* Allocate status ring */ + for (i = 0; i < wil->num_rx_status_rings; i++) { + int sring_id = wil_find_free_sring(wil); + + if (sring_id < 0) { + rc = -EFAULT; + goto err_free_status; + } + rc = wil_init_rx_sring(wil, status_ring_size, elem_size, + sring_id); + if (rc) + goto err_free_status; + } + + /* Allocate descriptor ring */ + rc = wil_init_rx_desc_ring(wil, desc_ring_size, + WIL_DEFAULT_RX_STATUS_RING_ID); + if (rc) + goto err_free_status; + + if (wil->rx_buff_id_count >= status_ring_size) { + wil_info(wil, + "rx_buff_id_count %d exceeds sring_size %d. set it to %d\n", + wil->rx_buff_id_count, status_ring_size, + status_ring_size - 1); + wil->rx_buff_id_count = status_ring_size - 1; + } + + /* Allocate Rx buffer array */ + rc = wil_init_rx_buff_arr(wil, wil->rx_buff_id_count); + if (rc) + goto err_free_desc; + + /* Fill descriptor ring with credits */ + rc = wil_rx_refill_edma(wil); + if (rc) + goto err_free_rx_buff_arr; + + return 0; +err_free_rx_buff_arr: + wil_free_rx_buff_arr(wil); +err_free_desc: + wil_ring_free_edma(wil, ring); +err_free_status: + for (i = 0; i < wil->num_rx_status_rings; i++) + wil_sring_free(wil, &wil->srings[i]); + + return rc; +} + +static int wil_ring_init_tx_edma(struct wil6210_vif *vif, int ring_id, + int size, int cid, int tid) +{ + struct wil6210_priv *wil = vif_to_wil(vif); + int rc; + struct wil_ring *ring = &wil->ring_tx[ring_id]; + struct wil_ring_tx_data *txdata = &wil->ring_tx_data[ring_id]; + + lockdep_assert_held(&wil->mutex); + + wil_dbg_misc(wil, + "init TX ring: ring_id=%u, cid=%u, tid=%u, sring_id=%u\n", + ring_id, cid, tid, wil->tx_sring_idx); + + wil_tx_data_init(txdata); + ring->size = size; + rc = wil_ring_alloc_desc_ring(wil, ring); + if (rc) + goto out; + + wil->ring2cid_tid[ring_id][0] = cid; + wil->ring2cid_tid[ring_id][1] = tid; + if (!vif->privacy) + txdata->dot1x_open = true; + + rc = wil_wmi_tx_desc_ring_add(vif, ring_id, cid, tid); + if (rc) { + wil_err(wil, "WMI_TX_DESC_RING_ADD_CMD failed\n"); + goto out_free; + } + + if (txdata->dot1x_open && agg_wsize >= 0) + wil_addba_tx_request(wil, ring_id, agg_wsize); + + return 0; + out_free: + spin_lock_bh(&txdata->lock); + txdata->dot1x_open = false; + txdata->enabled = 0; + spin_unlock_bh(&txdata->lock); + wil_ring_free_edma(wil, ring); + wil->ring2cid_tid[ring_id][0] = WIL6210_MAX_CID; + wil->ring2cid_tid[ring_id][1] = 0; + + out: + return rc; +} + +static int wil_ring_init_bcast_edma(struct wil6210_vif *vif, int ring_id, + int size) +{ + struct wil6210_priv *wil = vif_to_wil(vif); + struct wil_ring *ring = &wil->ring_tx[ring_id]; + int rc; + struct wil_ring_tx_data *txdata = &wil->ring_tx_data[ring_id]; + + wil_dbg_misc(wil, "init bcast: ring_id=%d, sring_id=%d\n", + ring_id, wil->tx_sring_idx); + + lockdep_assert_held(&wil->mutex); + + wil_tx_data_init(txdata); + ring->size = size; + ring->is_rx = false; + rc = wil_ring_alloc_desc_ring(wil, ring); + if (rc) + goto out; + + wil->ring2cid_tid[ring_id][0] = WIL6210_MAX_CID; /* CID */ + wil->ring2cid_tid[ring_id][1] = 0; /* TID */ + if (!vif->privacy) + txdata->dot1x_open = true; + + rc = wil_wmi_bcast_desc_ring_add(vif, ring_id); + if (rc) + goto out_free; + + return 0; + + out_free: + spin_lock_bh(&txdata->lock); + txdata->enabled = 0; + txdata->dot1x_open = false; + spin_unlock_bh(&txdata->lock); + wil_ring_free_edma(wil, ring); + +out: + return rc; +} + +static void wil_tx_fini_edma(struct wil6210_priv *wil) +{ + struct wil_status_ring *sring = &wil->srings[wil->tx_sring_idx]; + + wil_dbg_misc(wil, "free TX sring\n"); + + wil_sring_free(wil, sring); +} + +static void wil_rx_data_free(struct wil_status_ring *sring) +{ + if (!sring) + return; + + kfree_skb(sring->rx_data.skb); + sring->rx_data.skb = NULL; +} + +static void wil_rx_fini_edma(struct wil6210_priv *wil) +{ + struct wil_ring *ring = &wil->ring_rx; + int i; + + wil_dbg_misc(wil, "rx_fini_edma\n"); + + wil_ring_free_edma(wil, ring); + + for (i = 0; i < wil->num_rx_status_rings; i++) { + wil_rx_data_free(&wil->srings[i]); + wil_sring_free(wil, &wil->srings[i]); + } + + wil_free_rx_buff_arr(wil); +} + +void wil_init_txrx_ops_edma(struct wil6210_priv *wil) +{ + wil->txrx_ops.configure_interrupt_moderation = + wil_configure_interrupt_moderation_edma; + /* TX ops */ + wil->txrx_ops.ring_init_tx = wil_ring_init_tx_edma; + wil->txrx_ops.ring_fini_tx = wil_ring_free_edma; + wil->txrx_ops.ring_init_bcast = wil_ring_init_bcast_edma; + wil->txrx_ops.tx_init = wil_tx_init_edma; + wil->txrx_ops.tx_fini = wil_tx_fini_edma; + /* RX ops */ + wil->txrx_ops.rx_init = wil_rx_init_edma; + wil->txrx_ops.rx_fini = wil_rx_fini_edma; +} + |