[PATCH 1/5] ath10k: rework posting pci rx buffers
Michal Kazior
michal.kazior at tieto.com
Thu Aug 7 02:05:04 PDT 2014
It was possible on a host system running low on
memory to end up with no rx buffers on pci pipes.
This also cleans up the code a bit and, as a side
effect, makes it possible to call
ath10k_hif_start() more than once.
Signed-off-by: Michal Kazior <michal.kazior at tieto.com>
---
drivers/net/wireless/ath/ath10k/ce.c | 71 +++++++----
drivers/net/wireless/ath/ath10k/ce.h | 16 +--
drivers/net/wireless/ath/ath10k/pci.c | 234 ++++++++++++++++++----------------
drivers/net/wireless/ath/ath10k/pci.h | 2 +
4 files changed, 175 insertions(+), 148 deletions(-)
diff --git a/drivers/net/wireless/ath/ath10k/ce.c b/drivers/net/wireless/ath/ath10k/ce.c
index 8cbc0ab..f666816 100644
--- a/drivers/net/wireless/ath/ath10k/ce.c
+++ b/drivers/net/wireless/ath/ath10k/ce.c
@@ -385,44 +385,59 @@ int ath10k_ce_num_free_src_entries(struct ath10k_ce_pipe *pipe)
return delta;
}
-int ath10k_ce_recv_buf_enqueue(struct ath10k_ce_pipe *ce_state,
- void *per_recv_context,
- u32 buffer)
+
+int __ath10k_ce_rx_num_free_bufs(struct ath10k_ce_pipe *pipe)
{
- struct ath10k_ce_ring *dest_ring = ce_state->dest_ring;
- u32 ctrl_addr = ce_state->ctrl_addr;
- struct ath10k *ar = ce_state->ar;
+ struct ath10k *ar = pipe->ar;
struct ath10k_pci *ar_pci = ath10k_pci_priv(ar);
+ struct ath10k_ce_ring *dest_ring = pipe->dest_ring;
unsigned int nentries_mask = dest_ring->nentries_mask;
- unsigned int write_index;
- unsigned int sw_index;
- int ret;
+ unsigned int write_index = dest_ring->write_index;
+ unsigned int sw_index = dest_ring->sw_index;
- spin_lock_bh(&ar_pci->ce_lock);
- write_index = dest_ring->write_index;
- sw_index = dest_ring->sw_index;
+ lockdep_assert_held(&ar_pci->ce_lock);
- if (CE_RING_DELTA(nentries_mask, write_index, sw_index - 1) > 0) {
- struct ce_desc *base = dest_ring->base_addr_owner_space;
- struct ce_desc *desc = CE_DEST_RING_TO_DESC(base, write_index);
+ return CE_RING_DELTA(nentries_mask, write_index, sw_index - 1);
+}
+
+int __ath10k_ce_rx_post_buf(struct ath10k_ce_pipe *pipe, void *ctx, u32 paddr)
+{
+ struct ath10k *ar = pipe->ar;
+ struct ath10k_pci *ar_pci = ath10k_pci_priv(ar);
+ struct ath10k_ce_ring *dest_ring = pipe->dest_ring;
+ unsigned int nentries_mask = dest_ring->nentries_mask;
+ unsigned int write_index = dest_ring->write_index;
+ unsigned int sw_index = dest_ring->sw_index;
+ struct ce_desc *base = dest_ring->base_addr_owner_space;
+ struct ce_desc *desc = CE_DEST_RING_TO_DESC(base, write_index);
+ u32 ctrl_addr = pipe->ctrl_addr;
- /* Update destination descriptor */
- desc->addr = __cpu_to_le32(buffer);
- desc->nbytes = 0;
+ lockdep_assert_held(&ar_pci->ce_lock);
- dest_ring->per_transfer_context[write_index] =
- per_recv_context;
+ if (CE_RING_DELTA(nentries_mask, write_index, sw_index - 1) == 0)
+ return -EIO;
- /* Update Destination Ring Write Index */
- write_index = CE_RING_IDX_INCR(nentries_mask, write_index);
- ath10k_ce_dest_ring_write_index_set(ar, ctrl_addr, write_index);
- dest_ring->write_index = write_index;
- ret = 0;
- } else {
- ret = -EIO;
- }
+ desc->addr = __cpu_to_le32(paddr);
+ desc->nbytes = 0;
+
+ dest_ring->per_transfer_context[write_index] = ctx;
+ write_index = CE_RING_IDX_INCR(nentries_mask, write_index);
+ ath10k_ce_dest_ring_write_index_set(ar, ctrl_addr, write_index);
+ dest_ring->write_index = write_index;
+ return 0;
+}
+
+int ath10k_ce_rx_post_buf(struct ath10k_ce_pipe *pipe, void *ctx, u32 paddr)
+{
+ struct ath10k *ar = pipe->ar;
+ struct ath10k_pci *ar_pci = ath10k_pci_priv(ar);
+ int ret;
+
+ spin_lock_bh(&ar_pci->ce_lock);
+ ret = __ath10k_ce_rx_post_buf(pipe, ctx, paddr);
spin_unlock_bh(&ar_pci->ce_lock);
+
return ret;
}
diff --git a/drivers/net/wireless/ath/ath10k/ce.h b/drivers/net/wireless/ath/ath10k/ce.h
index d48dbb9..82d1f23 100644
--- a/drivers/net/wireless/ath/ath10k/ce.h
+++ b/drivers/net/wireless/ath/ath10k/ce.h
@@ -166,19 +166,9 @@ int ath10k_ce_num_free_src_entries(struct ath10k_ce_pipe *pipe);
/*==================Recv=======================*/
-/*
- * Make a buffer available to receive. The buffer must be at least of a
- * minimal size appropriate for this copy engine (src_sz_max attribute).
- * ce - which copy engine to use
- * per_transfer_recv_context - context passed back to caller's recv_cb
- * buffer - address of buffer in CE space
- * Returns 0 on success; otherwise an error status.
- *
- * Implemenation note: Pushes a buffer to Dest ring.
- */
-int ath10k_ce_recv_buf_enqueue(struct ath10k_ce_pipe *ce_state,
- void *per_transfer_recv_context,
- u32 buffer);
+int __ath10k_ce_rx_num_free_bufs(struct ath10k_ce_pipe *pipe);
+int __ath10k_ce_rx_post_buf(struct ath10k_ce_pipe *pipe, void *ctx, u32 paddr);
+int ath10k_ce_rx_post_buf(struct ath10k_ce_pipe *pipe, void *ctx, u32 paddr);
/* recv flags */
/* Data is byte-swapped */
diff --git a/drivers/net/wireless/ath/ath10k/pci.c b/drivers/net/wireless/ath/ath10k/pci.c
index c157717..7efcf8e 100644
--- a/drivers/net/wireless/ath/ath10k/pci.c
+++ b/drivers/net/wireless/ath/ath10k/pci.c
@@ -67,10 +67,7 @@ static DEFINE_PCI_DEVICE_TABLE(ath10k_pci_id_table) = {
static int ath10k_pci_diag_read_access(struct ath10k *ar, u32 address,
u32 *data);
-static int ath10k_pci_post_rx(struct ath10k *ar);
-static int ath10k_pci_post_rx_pipe(struct ath10k_pci_pipe *pipe_info,
- int num);
-static void ath10k_pci_rx_pipe_cleanup(struct ath10k_pci_pipe *pipe_info);
+static void ath10k_pci_buffer_cleanup(struct ath10k *ar);
static int ath10k_pci_cold_reset(struct ath10k *ar);
static int ath10k_pci_warm_reset(struct ath10k *ar);
static int ath10k_pci_wait_for_target_init(struct ath10k *ar);
@@ -278,6 +275,123 @@ static inline const char *ath10k_pci_get_irq_method(struct ath10k *ar)
return "legacy";
}
+static int __ath10k_pci_rx_post_buf(struct ath10k_pci_pipe *pipe)
+{
+ struct ath10k *ar = pipe->hif_ce_state;
+ struct ath10k_pci *ar_pci = ath10k_pci_priv(ar);
+ struct ath10k_ce_pipe *ce_pipe = pipe->ce_hdl;
+ struct sk_buff *skb;
+ dma_addr_t paddr;
+ int ret;
+
+ lockdep_assert_held(&ar_pci->ce_lock);
+
+ skb = dev_alloc_skb(pipe->buf_sz);
+ if (!skb)
+ return -ENOMEM;
+
+ WARN_ONCE((unsigned long)skb->data & 3, "unaligned skb");
+
+ paddr = dma_map_single(ar->dev, skb->data,
+ skb->len + skb_tailroom(skb),
+ DMA_FROM_DEVICE);
+ if (unlikely(dma_mapping_error(ar->dev, paddr))) {
+ ath10k_warn("failed to dma map pci rx buf\n");
+ dev_kfree_skb_any(skb);
+ return -EIO;
+ }
+
+ ATH10K_SKB_CB(skb)->paddr = paddr;
+
+ ret = __ath10k_ce_rx_post_buf(ce_pipe, skb, paddr);
+ if (ret) {
+ ath10k_warn("failed to post pci rx buf: %d\n", ret);
+ dma_unmap_single(ar->dev, paddr, skb->len + skb_tailroom(skb),
+ DMA_FROM_DEVICE);
+ dev_kfree_skb_any(skb);
+ return ret;
+ }
+
+ return 0;
+}
+
+static int __ath10k_pci_rx_post_pipe(struct ath10k_pci_pipe *pipe)
+{
+ struct ath10k *ar = pipe->hif_ce_state;
+ struct ath10k_pci *ar_pci = ath10k_pci_priv(ar);
+ struct ath10k_ce_pipe *ce_pipe = pipe->ce_hdl;
+ int ret, num;
+
+ lockdep_assert_held(&ar_pci->ce_lock);
+
+ if (pipe->buf_sz == 0)
+ return 0;
+
+ if (!ce_pipe->dest_ring)
+ return 0;
+
+ num = __ath10k_ce_rx_num_free_bufs(ce_pipe);
+ while (num--) {
+ ret = __ath10k_pci_rx_post_buf(pipe);
+ if (ret) {
+ ath10k_warn("failed to post pci rx buf: %d\n", ret);
+ return ret;
+ }
+ }
+
+ return 0;
+}
+
+static int ath10k_pci_rx_post(struct ath10k *ar)
+{
+ struct ath10k_pci *ar_pci = ath10k_pci_priv(ar);
+ struct ath10k_pci_pipe *pipe;
+ int i, ret;
+
+ spin_lock_bh(&ar_pci->ce_lock);
+ for (i = 0; i < CE_COUNT; i++) {
+ pipe = &ar_pci->pipe_info[i];
+
+ ret = __ath10k_pci_rx_post_pipe(pipe);
+ if (ret) {
+ ath10k_warn("failed to post pci rx pipe %d: %d\n",
+ i, ret);
+ break;
+ }
+ }
+ spin_unlock_bh(&ar_pci->ce_lock);
+
+ return ret;
+}
+
+static void ath10k_pci_rx_replenish(struct ath10k_pci_pipe *pipe)
+{
+ struct ath10k *ar = pipe->hif_ce_state;
+ struct ath10k_pci *ar_pci = ath10k_pci_priv(ar);
+ int ret;
+
+ spin_lock_bh(&ar_pci->ce_lock);
+ ret = __ath10k_pci_rx_post_pipe(pipe);
+ spin_unlock_bh(&ar_pci->ce_lock);
+
+ if (ret) {
+ ath10k_warn("failed to replenish pci rx pipe %d: %d, arming retry timer\n",
+ pipe->pipe_num, ret);
+ mod_timer(&ar_pci->rx_replenish_retry,
+ ATH10K_PCI_RX_REPLENISH_RETRY_MS);
+ }
+}
+
+static void ath10k_pci_rx_replenish_retry(unsigned long ptr)
+{
+ struct ath10k *ar = (void *)ptr;
+ struct ath10k_pci *ar_pci = ath10k_pci_priv(ar);
+ int i;
+
+ for (i = 0; i < CE_COUNT; i++)
+ ath10k_pci_rx_replenish(&ar_pci->pipe_info[i]);
+}
+
/*
* Diagnostic read/write access is provided for startup/config/debug usage.
* Caller must guarantee proper alignment, when applicable, and single user
@@ -344,7 +458,7 @@ static int ath10k_pci_diag_read_mem(struct ath10k *ar, u32 address, void *data,
nbytes = min_t(unsigned int, remaining_bytes,
DIAG_TRANSFER_LIMIT);
- ret = ath10k_ce_recv_buf_enqueue(ce_diag, NULL, ce_data);
+ ret = ath10k_ce_rx_post_buf(ce_diag, NULL, ce_data);
if (ret != 0)
goto done;
@@ -501,7 +615,7 @@ static int ath10k_pci_diag_write_mem(struct ath10k *ar, u32 address,
nbytes = min_t(int, remaining_bytes, DIAG_TRANSFER_LIMIT);
/* Set up to receive directly into Target(!) address */
- ret = ath10k_ce_recv_buf_enqueue(ce_diag, NULL, address);
+ ret = ath10k_ce_rx_post_buf(ce_diag, NULL, address);
if (ret != 0)
goto done;
@@ -663,12 +777,10 @@ static void ath10k_pci_ce_recv_data(struct ath10k_ce_pipe *ce_state)
unsigned int nbytes, max_nbytes;
unsigned int transfer_id;
unsigned int flags;
- int err, num_replenish = 0;
while (ath10k_ce_completed_recv_next(ce_state, &transfer_context,
&ce_data, &nbytes, &transfer_id,
&flags) == 0) {
- num_replenish++;
skb = transfer_context;
max_nbytes = skb->len + skb_tailroom(skb);
dma_unmap_single(ar->dev, ATH10K_SKB_CB(skb)->paddr,
@@ -685,12 +797,7 @@ static void ath10k_pci_ce_recv_data(struct ath10k_ce_pipe *ce_state)
cb->rx_completion(ar, skb, pipe_info->pipe_num);
}
- err = ath10k_pci_post_rx_pipe(pipe_info, num_replenish);
- if (unlikely(err)) {
- /* FIXME: retry */
- ath10k_warn("failed to replenish CE rx ring %d (%d bufs): %d\n",
- pipe_info->pipe_num, num_replenish, err);
- }
+ ath10k_pci_rx_replenish(pipe_info);
}
static int ath10k_pci_hif_tx_sg(struct ath10k *ar, u8 pipe_id,
@@ -944,94 +1051,6 @@ static void ath10k_pci_hif_get_default_pipe(struct ath10k *ar,
&dl_is_polled);
}
-static int ath10k_pci_post_rx_pipe(struct ath10k_pci_pipe *pipe_info,
- int num)
-{
- struct ath10k *ar = pipe_info->hif_ce_state;
- struct ath10k_pci *ar_pci = ath10k_pci_priv(ar);
- struct ath10k_ce_pipe *ce_state = pipe_info->ce_hdl;
- struct sk_buff *skb;
- dma_addr_t ce_data;
- int i, ret = 0;
-
- if (pipe_info->buf_sz == 0)
- return 0;
-
- for (i = 0; i < num; i++) {
- skb = dev_alloc_skb(pipe_info->buf_sz);
- if (!skb) {
- ath10k_warn("failed to allocate skbuff for pipe %d\n",
- num);
- ret = -ENOMEM;
- goto err;
- }
-
- WARN_ONCE((unsigned long)skb->data & 3, "unaligned skb");
-
- ce_data = dma_map_single(ar->dev, skb->data,
- skb->len + skb_tailroom(skb),
- DMA_FROM_DEVICE);
-
- if (unlikely(dma_mapping_error(ar->dev, ce_data))) {
- ath10k_warn("failed to DMA map sk_buff\n");
- dev_kfree_skb_any(skb);
- ret = -EIO;
- goto err;
- }
-
- ATH10K_SKB_CB(skb)->paddr = ce_data;
-
- pci_dma_sync_single_for_device(ar_pci->pdev, ce_data,
- pipe_info->buf_sz,
- PCI_DMA_FROMDEVICE);
-
- ret = ath10k_ce_recv_buf_enqueue(ce_state, (void *)skb,
- ce_data);
- if (ret) {
- ath10k_warn("failed to enqueue to pipe %d: %d\n",
- num, ret);
- goto err;
- }
- }
-
- return ret;
-
-err:
- ath10k_pci_rx_pipe_cleanup(pipe_info);
- return ret;
-}
-
-static int ath10k_pci_post_rx(struct ath10k *ar)
-{
- struct ath10k_pci *ar_pci = ath10k_pci_priv(ar);
- struct ath10k_pci_pipe *pipe_info;
- const struct ce_attr *attr;
- int pipe_num, ret = 0;
-
- for (pipe_num = 0; pipe_num < CE_COUNT; pipe_num++) {
- pipe_info = &ar_pci->pipe_info[pipe_num];
- attr = &host_ce_config_wlan[pipe_num];
-
- if (attr->dest_nentries == 0)
- continue;
-
- ret = ath10k_pci_post_rx_pipe(pipe_info,
- attr->dest_nentries - 1);
- if (ret) {
- ath10k_warn("failed to post RX buffer for pipe %d: %d\n",
- pipe_num, ret);
-
- for (; pipe_num >= 0; pipe_num--) {
- pipe_info = &ar_pci->pipe_info[pipe_num];
- ath10k_pci_rx_pipe_cleanup(pipe_info);
- }
- return ret;
- }
- }
-
- return 0;
-}
-
static int ath10k_pci_hif_start(struct ath10k *ar)
{
struct ath10k_pci *ar_pci = ath10k_pci_priv(ar);
@@ -1039,11 +1058,10 @@ static int ath10k_pci_hif_start(struct ath10k *ar)
ath10k_dbg(ATH10K_DBG_BOOT, "boot hif start\n");
- /* Post buffers once to start things off. */
- ret = ath10k_pci_post_rx(ar);
+ ret = ath10k_pci_rx_post(ar);
if (ret) {
- ath10k_warn("failed to post RX buffers for all pipes: %d\n",
- ret);
+ ath10k_warn("failed to post pci rx buffers: %d\n", ret);
+ ath10k_pci_buffer_cleanup(ar);
return ret;
}
@@ -1232,7 +1250,7 @@ static int ath10k_pci_hif_exchange_bmi_msg(struct ath10k *ar,
xfer.wait_for_resp = true;
xfer.resp_len = 0;
- ath10k_ce_recv_buf_enqueue(ce_rx, &xfer, resp_paddr);
+ ath10k_ce_rx_post_buf(ce_rx, &xfer, resp_paddr);
}
ret = ath10k_ce_send(ce_tx, &xfer, req_paddr, req_len, -1, 0);
@@ -2427,6 +2445,8 @@ static int ath10k_pci_probe(struct pci_dev *pdev,
ar_pci->ar = ar;
spin_lock_init(&ar_pci->ce_lock);
+ setup_timer(&ar_pci->rx_replenish_retry, ath10k_pci_rx_replenish_retry,
+ (unsigned long)ar);
ret = ath10k_pci_claim(ar);
if (ret) {
diff --git a/drivers/net/wireless/ath/ath10k/pci.h b/drivers/net/wireless/ath/ath10k/pci.h
index 662bca3..68fcb4f 100644
--- a/drivers/net/wireless/ath/ath10k/pci.h
+++ b/drivers/net/wireless/ath/ath10k/pci.h
@@ -185,6 +185,7 @@ struct ath10k_pci {
/* Map CE id to ce_state */
struct ath10k_ce_pipe ce_states[CE_COUNT_MAX];
+ struct timer_list rx_replenish_retry;
};
static inline struct ath10k_pci *ath10k_pci_priv(struct ath10k *ar)
@@ -192,6 +193,7 @@ static inline struct ath10k_pci *ath10k_pci_priv(struct ath10k *ar)
return (struct ath10k_pci *)ar->drv_priv;
}
+#define ATH10K_PCI_RX_REPLENISH_RETRY_MS 50
#define ATH_PCI_RESET_WAIT_MAX 10 /* ms */
#define PCIE_WAKE_TIMEOUT 5000 /* 5ms */
--
1.8.5.3
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