Signed-off-by: Kalle Valo <kvalo@xxxxxxxxxxxxxxxx>
---
drivers/net/wireless/ath/ath10k/htt_rx.c | 1167 ++++++++++++++++++++++++++++++
1 file changed, 1167 insertions(+)
create mode 100644 drivers/net/wireless/ath/ath10k/htt_rx.c
diff --git a/drivers/net/wireless/ath/ath10k/htt_rx.c b/drivers/net/wireless/ath/ath10k/htt_rx.c
new file mode 100644
index 0000000..de058d7
--- /dev/null
+++ b/drivers/net/wireless/ath/ath10k/htt_rx.c
@@ -0,0 +1,1167 @@
+/*
+ * Copyright (c) 2005-2011 Atheros Communications Inc.
+ * Copyright (c) 2011-2013 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 "htc.h"
+#include "htt.h"
+#include "txrx.h"
+#include "debug.h"
+
+#include <linux/log2.h>
+
+/* slightly larger than one large A-MPDU */
+#define HTT_RX_RING_SIZE_MIN 128
+
+/* roughly 20 ms @ 1 Gbps of 1500B MSDUs */
+#define HTT_RX_RING_SIZE_MAX 2048
+
+#define HTT_RX_AVG_FRM_BYTES 1000
+
+/* ms, very conservative */
+#define HTT_RX_HOST_LATENCY_MAX_MS 20
+
+/* ms, conservative */
+#define HTT_RX_HOST_LATENCY_WORST_LIKELY_MS 10
+
+/* when under memory pressure rx ring refill may fail and needs a retry */
+#define HTT_RX_RING_REFILL_RETRY_MS 50
+
+static int ath10k_htt_rx_ring_size(struct ath10k_htt *htt)
+{
+ int size;
+
+ /*
+ * It is expected that the host CPU will typically be able to
+ * service the rx indication from one A-MPDU before the rx
+ * indication from the subsequent A-MPDU happens, roughly 1-2 ms
+ * later. However, the rx ring should be sized very conservatively,
+ * to accomodate the worst reasonable delay before the host CPU
+ * services a rx indication interrupt.
+ *
+ * The rx ring need not be kept full of empty buffers. In theory,
+ * the htt host SW can dynamically track the low-water mark in the
+ * rx ring, and dynamically adjust the level to which the rx ring
+ * is filled with empty buffers, to dynamically meet the desired
+ * low-water mark.
+ *
+ * In contrast, it's difficult to resize the rx ring itself, once
+ * it's in use. Thus, the ring itself should be sized very
+ * conservatively, while the degree to which the ring is filled
+ * with empty buffers should be sized moderately conservatively.
+ */
+
+ /* 1e6 bps/mbps / 1e3 ms per sec = 1000 */
+ size =
+ htt->max_throughput_mbps +
+ 1000 /
+ (8 * HTT_RX_AVG_FRM_BYTES) * HTT_RX_HOST_LATENCY_MAX_MS;
+
+ if (size < HTT_RX_RING_SIZE_MIN)
+ size = HTT_RX_RING_SIZE_MIN;
+
+ if (size > HTT_RX_RING_SIZE_MAX)
+ size = HTT_RX_RING_SIZE_MAX;
+
+ size = roundup_pow_of_two(size);
+
+ return size;
+}
+
+static int ath10k_htt_rx_ring_fill_level(struct ath10k_htt *htt)
+{
+ int size;
+
+ /* 1e6 bps/mbps / 1e3 ms per sec = 1000 */
+ size =
+ htt->max_throughput_mbps *
+ 1000 /
+ (8 * HTT_RX_AVG_FRM_BYTES) * HTT_RX_HOST_LATENCY_WORST_LIKELY_MS;
+
+ /*
+ * Make sure the fill level is at least 1 less than the ring size.
+ * Leaving 1 element empty allows the SW to easily distinguish
+ * between a full ring vs. an empty ring.
+ */
+ if (size >= htt->rx_ring.size)
+ size = htt->rx_ring.size - 1;
+
+ return size;
+}
+
+static void ath10k_htt_rx_ring_free(struct ath10k_htt *htt)
+{
+ struct sk_buff *skb;
+ struct ath10k_skb_cb *cb;
+ int i;
+
+ for (i = 0; i < htt->rx_ring.fill_cnt; i++) {
+ skb = htt->rx_ring.netbufs_ring[i];
+ cb = ATH10K_SKB_CB(skb);
+ dma_unmap_single(htt->ar->dev, cb->paddr,
+ skb->len + skb_tailroom(skb),
+ DMA_FROM_DEVICE);
+ dev_kfree_skb_any(skb);
+ }
+
+ htt->rx_ring.fill_cnt = 0;
+}
+
+static int __ath10k_htt_rx_ring_fill_n(struct ath10k_htt *htt, int num)
+{
+ struct htt_rx_desc *rx_desc;
+ struct sk_buff *skb;
+ dma_addr_t paddr;
+ int ret = 0, idx;
+
+ idx = __le32_to_cpu(*(htt->rx_ring.alloc_idx.vaddr));
+ while (num > 0) {
+ skb = dev_alloc_skb(HTT_RX_BUF_SIZE + HTT_RX_DESC_ALIGN);
+ if (!skb) {
+ ret = -ENOMEM;
+ goto fail;
+ }
+
+ if (!IS_ALIGNED((unsigned long)skb->data, HTT_RX_DESC_ALIGN))
+ skb_pull(skb,
+ PTR_ALIGN(skb->data, HTT_RX_DESC_ALIGN) -
+ skb->data);
+
+ /* Clear rx_desc attention word before posting to Rx ring */
+ rx_desc = (struct htt_rx_desc *)skb->data;
+ rx_desc->attention.flags = __cpu_to_le32(0);
+
+ paddr = dma_map_single(htt->ar->dev, skb->data,
+ skb->len + skb_tailroom(skb),
+ DMA_FROM_DEVICE);
+
+ if (unlikely(dma_mapping_error(htt->ar->dev, paddr))) {
+ dev_kfree_skb_any(skb);
+ ret = -ENOMEM;
+ goto fail;
+ }
+
+ ATH10K_SKB_CB(skb)->paddr = paddr;
+ htt->rx_ring.netbufs_ring[idx] = skb;
+ htt->rx_ring.paddrs_ring[idx] = __cpu_to_le32(paddr);
+ htt->rx_ring.fill_cnt++;
+
+ num--;
+ idx++;
+ idx &= htt->rx_ring.size_mask;
+ }
+
+fail:
+ *(htt->rx_ring.alloc_idx.vaddr) = __cpu_to_le32(idx);
+ return ret;
+}
+
+static int ath10k_htt_rx_ring_fill_n(struct ath10k_htt *htt, int num)
+{
+ lockdep_assert_held(&htt->rx_ring.lock);
+ return __ath10k_htt_rx_ring_fill_n(htt, num);
+}
+
+static void ath10k_htt_rx_msdu_buff_replenish(struct ath10k_htt *htt)
+{
+ int ret, num_to_fill;
+
+ spin_lock_bh(&htt->rx_ring.lock);
+ num_to_fill = htt->rx_ring.fill_level - htt->rx_ring.fill_cnt;
+ ret = ath10k_htt_rx_ring_fill_n(htt, num_to_fill);
+ if (ret == -ENOMEM) {
+ /*
+ * Failed to fill it to the desired level -
+ * we'll start a timer and try again next time.
+ * As long as enough buffers are left in the ring for
+ * another A-MPDU rx, no special recovery is needed.
+ */
+ mod_timer(&htt->rx_ring.refill_retry_timer, jiffies +
+ msecs_to_jiffies(HTT_RX_RING_REFILL_RETRY_MS));
+ }
+ spin_unlock_bh(&htt->rx_ring.lock);
+}
+
+static void ath10k_htt_rx_ring_refill_retry(unsigned long arg)
+{
+ struct ath10k_htt *htt = (struct ath10k_htt *)arg;
+ ath10k_htt_rx_msdu_buff_replenish(htt);
+}
+
+static unsigned ath10k_htt_rx_ring_elems(struct ath10k_htt *htt)
+{
+ return (__le32_to_cpu(*htt->rx_ring.alloc_idx.vaddr) -
+ htt->rx_ring.sw_rd_idx.msdu_payld) & htt->rx_ring.size_mask;
+}
+
+void ath10k_htt_rx_detach(struct ath10k_htt *htt)
+{
+ int sw_rd_idx = htt->rx_ring.sw_rd_idx.msdu_payld;
+
+ del_timer_sync(&htt->rx_ring.refill_retry_timer);
+
+ while (sw_rd_idx != __le32_to_cpu(*(htt->rx_ring.alloc_idx.vaddr))) {
+ struct sk_buff *skb =
+ htt->rx_ring.netbufs_ring[sw_rd_idx];
+ struct ath10k_skb_cb *cb = ATH10K_SKB_CB(skb);
+
+ dma_unmap_single(htt->ar->dev, cb->paddr,
+ skb->len + skb_tailroom(skb),
+ DMA_FROM_DEVICE);
+ dev_kfree_skb_any(htt->rx_ring.netbufs_ring[sw_rd_idx]);
+ sw_rd_idx++;
+ sw_rd_idx &= htt->rx_ring.size_mask;
+ }
+
+ dma_free_coherent(htt->ar->dev,
+ (htt->rx_ring.size *
+ sizeof(htt->rx_ring.paddrs_ring)),
+ htt->rx_ring.paddrs_ring,
+ htt->rx_ring.base_paddr);
+
+ dma_free_coherent(htt->ar->dev,
+ sizeof(*htt->rx_ring.alloc_idx.vaddr),
+ htt->rx_ring.alloc_idx.vaddr,
+ htt->rx_ring.alloc_idx.paddr);
+
+ kfree(htt->rx_ring.netbufs_ring);
+}
+
+static inline struct sk_buff *ath10k_htt_rx_netbuf_pop(struct ath10k_htt *htt)
+{
+ int idx;
+ struct sk_buff *msdu;
+
+ spin_lock_bh(&htt->rx_ring.lock);
+
+ if (ath10k_htt_rx_ring_elems(htt) == 0)
+ ath10k_warn("htt rx ring is empty!\n");
+
+ idx = htt->rx_ring.sw_rd_idx.msdu_payld;
+ msdu = htt->rx_ring.netbufs_ring[idx];
+
+ idx++;
+ idx &= htt->rx_ring.size_mask;
+ htt->rx_ring.sw_rd_idx.msdu_payld = idx;
+ htt->rx_ring.fill_cnt--;
+
+ spin_unlock_bh(&htt->rx_ring.lock);
+ return msdu;
+}
+
+static void ath10k_htt_rx_free_msdu_chain(struct sk_buff *skb)
+{
+ struct sk_buff *next;
+
+ while (skb) {
+ next = skb->next;
+ dev_kfree_skb_any(skb);
+ skb = next;
+ }
+}
+
+static int ath10k_htt_rx_amsdu_pop(struct ath10k_htt *htt,
+ u8 **fw_desc, int *fw_desc_len,
+ struct sk_buff **head_msdu,
+ struct sk_buff **tail_msdu)
+{
+ int msdu_len, msdu_chaining = 0;
+ struct sk_buff *msdu;
+ struct htt_rx_desc *rx_desc;
+
+ if (ath10k_htt_rx_ring_elems(htt) == 0)
+ ath10k_warn("htt rx ring is empty!\n");
+
+ if (htt->rx_confused) {
+ ath10k_warn("htt is confused. refusing rx\n");
+ return 0;
+ }
+
+ msdu = *head_msdu = ath10k_htt_rx_netbuf_pop(htt);
+ while (msdu) {
+ int last_msdu, msdu_len_invalid, msdu_chained;
+
+ dma_unmap_single(htt->ar->dev,
+ ATH10K_SKB_CB(msdu)->paddr,
+ msdu->len + skb_tailroom(msdu),
+ DMA_FROM_DEVICE);
+
+ ath10k_dbg_dump(ATH10K_DBG_HTT_DUMP, NULL, "htt rx: ",
+ msdu->data, msdu->len + skb_tailroom(msdu));
+
+ rx_desc = (struct htt_rx_desc *)msdu->data;
+
+ /* FIXME: we must report msdu payload since this is what caller
+ * expects now */
+ skb_put(msdu, offsetof(struct htt_rx_desc, msdu_payload));
+ skb_pull(msdu, offsetof(struct htt_rx_desc, msdu_payload));
+
+ /*
+ * Sanity check - confirm the HW is finished filling in the
+ * rx data.
+ * If the HW and SW are working correctly, then it's guaranteed
+ * that the HW's MAC DMA is done before this point in the SW.
+ * To prevent the case that we handle a stale Rx descriptor,
+ * just assert for now until we have a way to recover.
+ */
+ if (!(__le32_to_cpu(rx_desc->attention.flags)
+ & RX_ATTENTION_FLAGS_MSDU_DONE)) {
+ ath10k_htt_rx_free_msdu_chain(*head_msdu);
+ *head_msdu = NULL;
+ msdu = NULL;
+ ath10k_err("htt rx stopped. cannot recover\n");
+ htt->rx_confused = true;
+ break;
+ }
+
+ /*
+ * Copy the FW rx descriptor for this MSDU from the rx
+ * indication message into the MSDU's netbuf. HL uses the
+ * same rx indication message definition as LL, and simply
+ * appends new info (fields from the HW rx desc, and the
+ * MSDU payload itself). So, the offset into the rx
+ * indication message only has to account for the standard
+ * offset of the per-MSDU FW rx desc info within the
+ * message, and how many bytes of the per-MSDU FW rx desc
+ * info have already been consumed. (And the endianness of
+ * the host, since for a big-endian host, the rx ind
+ * message contents, including the per-MSDU rx desc bytes,
+ * were byteswapped during upload.)
+ */
+ if (*fw_desc_len > 0) {
+ rx_desc->fw_desc.info0 = **fw_desc;
+ /*
+ * The target is expected to only provide the basic
+ * per-MSDU rx descriptors. Just to be sure, verify
+ * that the target has not attached extension data
+ * (e.g. LRO flow ID).
+ */
+
+ /* or more, if there's extension data */
+ (*fw_desc)++;
+ (*fw_desc_len)--;
+ } else {
+ /*
+ * When an oversized AMSDU happened, FW will lost
+ * some of MSDU status - in this case, the FW
+ * descriptors provided will be less than the
+ * actual MSDUs inside this MPDU. Mark the FW
+ * descriptors so that it will still deliver to
+ * upper stack, if no CRC error for this MPDU.
+ *
+ * FIX THIS - the FW descriptors are actually for
+ * MSDUs in the end of this A-MSDU instead of the
+ * beginning.
+ */
+ rx_desc->fw_desc.info0 = 0;
+ }
+
+ msdu_len_invalid = !!(__le32_to_cpu(rx_desc->attention.flags)
+ & (RX_ATTENTION_FLAGS_MPDU_LENGTH_ERR |
+ RX_ATTENTION_FLAGS_MSDU_LENGTH_ERR));
+ msdu_len = MS(__le32_to_cpu(rx_desc->msdu_start.info0),
+ RX_MSDU_START_INFO0_MSDU_LENGTH);
+ msdu_chained = rx_desc->frag_info.ring2_more_count;
+
+ if (msdu_len_invalid)
+ msdu_len = 0;
+
+ skb_trim(msdu, 0);
+ skb_put(msdu, min(msdu_len, HTT_RX_MSDU_SIZE));
+ msdu_len -= msdu->len;
+
+ /* FIXME: Do chained buffers include htt_rx_desc or not? */
+ while (msdu_chained--) {
+ struct sk_buff *next = ath10k_htt_rx_netbuf_pop(htt);
+
+ dma_unmap_single(htt->ar->dev,
+ ATH10K_SKB_CB(next)->paddr,
+ next->len + skb_tailroom(next),
+ DMA_FROM_DEVICE);
+
+ ath10k_dbg_dump(ATH10K_DBG_HTT_DUMP, NULL, "htt rx: ",
+ next->data,
+ next->len + skb_tailroom(next));
+
+ skb_trim(next, 0);
+ skb_put(next, min(msdu_len, HTT_RX_BUF_SIZE));
+ msdu_len -= next->len;
+
+ msdu->next = next;
+ msdu = next;
+ msdu_chaining = 1;
+ }
+
+ if (msdu_len > 0) {
+ /* This may suggest FW bug? */
+ ath10k_warn("htt rx msdu len not consumed (%d)\n",
+ msdu_len);
+ }
+
+ last_msdu = __le32_to_cpu(rx_desc->msdu_end.info0) &
+ RX_MSDU_END_INFO0_LAST_MSDU;
+
+ if (last_msdu) {
+ msdu->next = NULL;
+ break;
+ } else {
+ struct sk_buff *next = ath10k_htt_rx_netbuf_pop(htt);
+ msdu->next = next;
+ msdu = next;
+ }
+ }
+ *tail_msdu = msdu;
+
+ /*
+ * Don't refill the ring yet.
+ *
+ * First, the elements popped here are still in use - it is not
+ * safe to overwrite them until the matching call to
+ * mpdu_desc_list_next. Second, for efficiency it is preferable to
+ * refill the rx ring with 1 PPDU's worth of rx buffers (something
+ * like 32 x 3 buffers), rather than one MPDU's worth of rx buffers
+ * (something like 3 buffers). Consequently, we'll rely on the txrx
+ * SW to tell us when it is done pulling all the PPDU's rx buffers
+ * out of the rx ring, and then refill it just once.
+ */
+
+ return msdu_chaining;
+}
+
+int ath10k_htt_rx_attach(struct ath10k_htt *htt)
+{
+ dma_addr_t paddr;
+ void *vaddr;
+ struct timer_list *timer = &htt->rx_ring.refill_retry_timer;
+
+ htt->rx_ring.size = ath10k_htt_rx_ring_size(htt);
+ if (!is_power_of_2(htt->rx_ring.size)) {
+ ath10k_warn("htt rx ring size is not power of 2\n");
+ return -EINVAL;
+ }
+
+ htt->rx_ring.size_mask = htt->rx_ring.size - 1;
+
+ /*
+ * Set the initial value for the level to which the rx ring
+ * should be filled, based on the max throughput and the
+ * worst likely latency for the host to fill the rx ring
+ * with new buffers. In theory, this fill level can be
+ * dynamically adjusted from the initial value set here, to
+ * reflect the actual host latency rather than a
+ * conservative assumption about the host latency.
+ */
+ htt->rx_ring.fill_level = ath10k_htt_rx_ring_fill_level(htt);
+
+ htt->rx_ring.netbufs_ring =
+ kmalloc(htt->rx_ring.size * sizeof(struct sk_buff *),
+ GFP_KERNEL);
+ if (!htt->rx_ring.netbufs_ring)
+ goto err_netbuf;
+
+ vaddr = dma_alloc_coherent(htt->ar->dev,
+ (htt->rx_ring.size * sizeof(htt->rx_ring.paddrs_ring)),
+ &paddr, GFP_DMA);
+ if (!vaddr)
+ goto err_dma_ring;
+
+ htt->rx_ring.paddrs_ring = vaddr;
+ htt->rx_ring.base_paddr = paddr;
+
+ vaddr = dma_alloc_coherent(htt->ar->dev,
+ sizeof(*htt->rx_ring.alloc_idx.vaddr),
+ &paddr, GFP_DMA);
+ if (!vaddr)
+ goto err_dma_idx;
+
+ htt->rx_ring.alloc_idx.vaddr = vaddr;
+ htt->rx_ring.alloc_idx.paddr = paddr;
+ htt->rx_ring.sw_rd_idx.msdu_payld = 0;
+ *htt->rx_ring.alloc_idx.vaddr = 0;
+
+ /* Initialize the Rx refill retry timer */
+ setup_timer(timer, ath10k_htt_rx_ring_refill_retry, (unsigned long)htt);
+
+ spin_lock_init(&htt->rx_ring.lock);
+
+ htt->rx_ring.fill_cnt = 0;
+ if (__ath10k_htt_rx_ring_fill_n(htt, htt->rx_ring.fill_level))
+ goto err_fill_ring;
+
+ ath10k_dbg(ATH10K_DBG_HTT, "HTT RX ring size: %d, fill_level: %d\n",
+ htt->rx_ring.size, htt->rx_ring.fill_level);
+ return 0;
+
+err_fill_ring:
+ ath10k_htt_rx_ring_free(htt);
+ dma_free_coherent(htt->ar->dev,
+ sizeof(*htt->rx_ring.alloc_idx.vaddr),
+ htt->rx_ring.alloc_idx.vaddr,
+ htt->rx_ring.alloc_idx.paddr);
+err_dma_idx:
+ dma_free_coherent(htt->ar->dev,
+ (htt->rx_ring.size *
+ sizeof(htt->rx_ring.paddrs_ring)),
+ htt->rx_ring.paddrs_ring,
+ htt->rx_ring.base_paddr);
+err_dma_ring:
+ kfree(htt->rx_ring.netbufs_ring);
+err_netbuf:
+ return -ENOMEM;
+}
+
+static int ath10k_htt_rx_crypto_param_len(enum htt_rx_mpdu_encrypt_type type)
+{
+ switch (type) {
+ case HTT_RX_MPDU_ENCRYPT_WEP40:
+ case HTT_RX_MPDU_ENCRYPT_WEP104:
+ return 4;
+ case HTT_RX_MPDU_ENCRYPT_TKIP_WITHOUT_MIC:
+ case HTT_RX_MPDU_ENCRYPT_WEP128: /* not tested */
+ case HTT_RX_MPDU_ENCRYPT_TKIP_WPA:
+ case HTT_RX_MPDU_ENCRYPT_WAPI: /* not tested */
+ case HTT_RX_MPDU_ENCRYPT_AES_CCM_WPA2:
+ return 8;
+ case HTT_RX_MPDU_ENCRYPT_NONE:
+ return 0;
+ }
+
+ ath10k_warn("unknown encryption type %d\n", type);
+ return 0;
+}
+
+static int ath10k_htt_rx_crypto_tail_len(enum htt_rx_mpdu_encrypt_type type)
+{
+ switch (type) {
+ case HTT_RX_MPDU_ENCRYPT_NONE:
+ case HTT_RX_MPDU_ENCRYPT_WEP40:
+ case HTT_RX_MPDU_ENCRYPT_WEP104:
+ case HTT_RX_MPDU_ENCRYPT_WEP128:
+ case HTT_RX_MPDU_ENCRYPT_WAPI:
+ return 0;
+ case HTT_RX_MPDU_ENCRYPT_TKIP_WITHOUT_MIC:
+ case HTT_RX_MPDU_ENCRYPT_TKIP_WPA:
+ return 4;
+ case HTT_RX_MPDU_ENCRYPT_AES_CCM_WPA2:
+ return 8;
+ }
+
+ ath10k_warn("unknown encryption type %d\n", type);
+ return 0;
+}
+
+/* Applies for first msdu in chain, before altering it. */
+static struct ieee80211_hdr *ath10k_htt_rx_skb_get_hdr(struct sk_buff *skb)
+{
+ struct htt_rx_desc *rxd;
+ enum rx_msdu_decap_format fmt;
+
+ rxd = (void *)skb->data - sizeof(*rxd);
+ fmt = MS(__le32_to_cpu(rxd->msdu_start.info1),
+ RX_MSDU_START_INFO1_DECAP_FORMAT);
+
+ if (fmt == RX_MSDU_DECAP_RAW)
+ return (void *)skb->data;
+ else
+ return (void *)skb->data - RX_HTT_HDR_STATUS_LEN;
+}
+
+/* This function only applies for first msdu in an msdu chain */
+static bool ath10k_htt_rx_hdr_is_amsdu(struct ieee80211_hdr *hdr)
+{
+ if (ieee80211_is_data_qos(hdr->frame_control)) {
+ u8 *qc = ieee80211_get_qos_ctl(hdr);
+ if (qc[0] & 0x80)
+ return true;
+ }
+ return false;
+}
+
+static int ath10k_htt_rx_amsdu(struct ath10k_htt *htt,
+ struct htt_rx_info *info)
+{
+ struct htt_rx_desc *rxd;
+ struct sk_buff *amsdu;
+ struct sk_buff *first;
+ struct ieee80211_hdr *hdr;
+ struct sk_buff *skb = info->skb;
+ enum rx_msdu_decap_format fmt;
+ enum htt_rx_mpdu_encrypt_type enctype;
+ unsigned int hdr_len;
+ int crypto_len;
+
+ rxd = (void *)skb->data - sizeof(*rxd);
+ fmt = MS(__le32_to_cpu(rxd->msdu_start.info1),
+ RX_MSDU_START_INFO1_DECAP_FORMAT);
+ enctype = MS(__le32_to_cpu(rxd->mpdu_start.info0),
+ RX_MPDU_START_INFO0_ENCRYPT_TYPE);
+
+ /* FIXME: No idea what assumptions are safe here. Need logs */
+ if ((fmt == RX_MSDU_DECAP_RAW && skb->next) ||
+ (fmt == RX_MSDU_DECAP_8023_SNAP_LLC)) {
+ ath10k_htt_rx_free_msdu_chain(skb->next);
+ skb->next = NULL;
+ return -ENOTSUPP;
+ }
+
+ /* A-MSDU max is a little less than 8K */
+ amsdu = dev_alloc_skb(8*1024);
+ if (!amsdu) {
+ ath10k_warn("A-MSDU allocation failed\n");
+ ath10k_htt_rx_free_msdu_chain(skb->next);
+ skb->next = NULL;
+ return -ENOMEM;
+ }
+
+ if (fmt >= RX_MSDU_DECAP_NATIVE_WIFI) {
+ int hdrlen;
+
+ hdr = (void *)rxd->rx_hdr_status;
+ hdrlen = ieee80211_hdrlen(hdr->frame_control);
+ memcpy(skb_put(amsdu, hdrlen), hdr, hdrlen);
+ }
+
+ first = skb;
+ while (skb) {
+ void *decap_hdr;
+ int decap_len = 0;
+
+ rxd = (void *)skb->data - sizeof(*rxd);
+ fmt = MS(__le32_to_cpu(rxd->msdu_start.info1),
+ RX_MSDU_START_INFO1_DECAP_FORMAT);
+ decap_hdr = (void *)rxd->rx_hdr_status;
+
+ if (skb == first) {
+ /* We receive linked A-MSDU subframe skbuffs. The
+ * first one contains the original 802.11 header (and
+ * possible crypto param) in the RX descriptor. The
+ * A-MSDU subframe header follows that. Each part is
+ * aligned to 4 byte boundary. */
+
+ hdr = (void *)amsdu->data;
+ hdr_len = ieee80211_hdrlen(hdr->frame_control);
+ crypto_len = ath10k_htt_rx_crypto_param_len(enctype);
+
+ decap_hdr += roundup(hdr_len, 4);
+ decap_hdr += roundup(crypto_len, 4);
+ }
+
+ if (fmt == RX_MSDU_DECAP_ETHERNET2_DIX) {
+ /* Ethernet2 decap inserts ethernet header in place of
+ * A-MSDU subframe header. */
+ skb_pull(skb, 6 + 6 + 2);
+
+ /* A-MSDU subframe header length */
+ decap_len += 6 + 6 + 2;
+
+ /* Ethernet2 decap also strips the LLC/SNAP so we need
+ * to re-insert it. The LLC/SNAP follows A-MSDU
+ * subframe header. */
+ /* FIXME: Not all LLCs are 8 bytes long */
+ decap_len += 8;
+
+ memcpy(skb_put(amsdu, decap_len), decap_hdr, decap_len);
+ }
+
+ if (fmt == RX_MSDU_DECAP_NATIVE_WIFI) {
+ /* Native Wifi decap inserts regular 802.11 header
+ * in place of A-MSDU subframe header. */
+ hdr = (struct ieee80211_hdr *)skb->data;
+ skb_pull(skb, ieee80211_hdrlen(hdr->frame_control));
+
+ /* A-MSDU subframe header length */
+ decap_len += 6 + 6 + 2;
+
+ memcpy(skb_put(amsdu, decap_len), decap_hdr, decap_len);
+ }
+
+ if (fmt == RX_MSDU_DECAP_RAW)
+ skb_trim(skb, skb->len - 4); /* remove FCS */
+
+ memcpy(skb_put(amsdu, skb->len), skb->data, skb->len);
+
+ /* A-MSDU subframes are padded to 4bytes
+ * but relative to first subframe, not the whole MPDU */
+ if (skb->next && ((decap_len + skb->len) & 3)) {
+ int padlen = 4 - ((decap_len + skb->len) & 3);
+ memset(skb_put(amsdu, padlen), 0, padlen);
+ }
+
+ skb = skb->next;
+ }
+
+ info->skb = amsdu;
+ info->encrypt_type = enctype;
+
+ ath10k_htt_rx_free_msdu_chain(first);
+
+ return 0;
+}
+
+static int ath10k_htt_rx_msdu(struct ath10k_htt *htt, struct htt_rx_info *info)
+{
+ struct sk_buff *skb = info->skb;
+ struct htt_rx_desc *rxd;
+ struct ieee80211_hdr *hdr;
+ enum rx_msdu_decap_format fmt;
+ enum htt_rx_mpdu_encrypt_type enctype;
+
+ /* This shouldn't happen. If it does than it may be a FW bug. */
+ if (skb->next) {
+ ath10k_warn("received chained non A-MSDU frame\n");
+ ath10k_htt_rx_free_msdu_chain(skb->next);
+ skb->next = NULL;
+ }
+
+ rxd = (void *)skb->data - sizeof(*rxd);
+ fmt = MS(__le32_to_cpu(rxd->msdu_start.info1),
+ RX_MSDU_START_INFO1_DECAP_FORMAT);
+ enctype = MS(__le32_to_cpu(rxd->mpdu_start.info0),
+ RX_MPDU_START_INFO0_ENCRYPT_TYPE);
+ hdr = (void *)skb->data - RX_HTT_HDR_STATUS_LEN;
+
+ switch (fmt) {
+ case RX_MSDU_DECAP_RAW:
+ /* remove trailing FCS */
+ skb_trim(skb, skb->len - 4);
+ break;
+ case RX_MSDU_DECAP_NATIVE_WIFI:
+ /* nothing to do here */
+ break;
+ case RX_MSDU_DECAP_ETHERNET2_DIX:
+ /* macaddr[6] + macaddr[6] + ethertype[2] */
+ skb_pull(skb, 6 + 6 + 2);
+ break;
+ case RX_MSDU_DECAP_8023_SNAP_LLC:
+ /* macaddr[6] + macaddr[6] + len[2] */
+ /* we don't need this for non-A-MSDU */
+ skb_pull(skb, 6 + 6 + 2);
+ break;
+ }
+
+ if (fmt == RX_MSDU_DECAP_ETHERNET2_DIX) {
+ void *llc;
+ int llclen;
+
+ llclen = 8;
+ llc = hdr;
+ llc += roundup(ieee80211_hdrlen(hdr->frame_control), 4);
+ llc += roundup(ath10k_htt_rx_crypto_param_len(enctype), 4);
+
+ skb_push(skb, llclen);
+ memcpy(skb->data, llc, llclen);
+ }
+
+ if (fmt >= RX_MSDU_DECAP_ETHERNET2_DIX) {
+ int len = ieee80211_hdrlen(hdr->frame_control);
+ skb_push(skb, len);
+ memcpy(skb->data, hdr, len);
+ }
+
+ info->skb = skb;
+ info->encrypt_type = enctype;
+ return 0;
+}
+
+static bool ath10k_htt_rx_has_decrypt_err(struct sk_buff *skb)
+{
+ struct htt_rx_desc *rxd;
+ u32 flags;
+
+ rxd = (void *)skb->data - sizeof(*rxd);
+ flags = __le32_to_cpu(rxd->attention.flags);
+
+ if (flags & RX_ATTENTION_FLAGS_DECRYPT_ERR)
+ return true;
+
+ return false;
+}
+
+static bool ath10k_htt_rx_has_fcs_err(struct sk_buff *skb)
+{
+ struct htt_rx_desc *rxd;
+ u32 flags;
+
+ rxd = (void *)skb->data - sizeof(*rxd);
+ flags = __le32_to_cpu(rxd->attention.flags);
+
+ if (flags & RX_ATTENTION_FLAGS_FCS_ERR)
+ return true;
+
+ return false;
+}
+
+static void ath10k_htt_rx_handler(struct ath10k_htt *htt,
+ struct htt_rx_indication *rx)
+{
+ struct htt_rx_info info;
+ struct htt_rx_indication_mpdu_range *mpdu_ranges;
+ struct ieee80211_hdr *hdr;
+ int num_mpdu_ranges;
+ int fw_desc_len;
+ u8 *fw_desc;
+ int i, j;
+ int ret;
+
+ memset(&info, 0, sizeof(info));
+
+ fw_desc_len = __le16_to_cpu(rx->prefix.fw_rx_desc_bytes);
+ fw_desc = (u8 *)&rx->fw_desc;
+
+ num_mpdu_ranges = MS(__le32_to_cpu(rx->hdr.info1),
+ HTT_RX_INDICATION_INFO1_NUM_MPDU_RANGES);
+ mpdu_ranges = htt_rx_ind_get_mpdu_ranges(rx);
+
+ ath10k_dbg_dump(ATH10K_DBG_HTT_DUMP, NULL, "htt rx ind: ",
+ rx, sizeof(*rx) +
+ (sizeof(struct htt_rx_indication_mpdu_range) *
+ num_mpdu_ranges));
+
+ for (i = 0; i < num_mpdu_ranges; i++) {
+ info.status = mpdu_ranges[i].mpdu_range_status;
+
+ for (j = 0; j < mpdu_ranges[i].mpdu_count; j++) {
+ struct sk_buff *msdu_head, *msdu_tail;
+ enum htt_rx_mpdu_status status;
+ int msdu_chaining;
+
+ msdu_head = NULL;
+ msdu_tail = NULL;
+ msdu_chaining = ath10k_htt_rx_amsdu_pop(htt,
+ &fw_desc,
+ &fw_desc_len,
+ &msdu_head,
+ &msdu_tail);
+
+ if (!msdu_head) {
+ ath10k_warn("htt rx no data!\n");
+ continue;
+ }
+
+ if (msdu_head->len == 0) {
+ ath10k_dbg(ATH10K_DBG_HTT,
+ "htt rx dropping due to zero-len\n");
+ ath10k_htt_rx_free_msdu_chain(msdu_head);
+ continue;
+ }
+
+ if (ath10k_htt_rx_has_decrypt_err(msdu_head)) {
+ ath10k_htt_rx_free_msdu_chain(msdu_head);
+ continue;
+ }
+
+ status = info.status;
+
+ /* Skip mgmt frames while we handle this in WMI */
+ if (status == HTT_RX_IND_MPDU_STATUS_MGMT_CTRL) {
+ ath10k_htt_rx_free_msdu_chain(msdu_head);
+ continue;
+ }
+
+ if (status != HTT_RX_IND_MPDU_STATUS_OK &&
+ status != HTT_RX_IND_MPDU_STATUS_TKIP_MIC_ERR &&
+ !htt->ar->monitor_enabled) {
+ ath10k_dbg(ATH10K_DBG_HTT,
+ "htt rx ignoring frame w/ status %d\n",
+ status);
+ ath10k_htt_rx_free_msdu_chain(msdu_head);
+ continue;
+ }
+
+ /* FIXME: we do not support chaining yet.
+ * this needs investigation */
+ if (msdu_chaining) {
+ ath10k_warn("msdu_chaining is true\n");
+ ath10k_htt_rx_free_msdu_chain(msdu_head);
+ continue;
+ }
+
+ info.skb = msdu_head;
+ info.fcs_err = ath10k_htt_rx_has_fcs_err(msdu_head);
+ info.signal = ATH10K_DEFAULT_NOISE_FLOOR;
+ info.signal += rx->ppdu.combined_rssi;
+
+ info.rate.info0 = rx->ppdu.info0;
+ info.rate.info1 = __le32_to_cpu(rx->ppdu.info1);
+ info.rate.info2 = __le32_to_cpu(rx->ppdu.info2);
+
+ hdr = ath10k_htt_rx_skb_get_hdr(msdu_head);
+
+ if (ath10k_htt_rx_hdr_is_amsdu(hdr))
+ ret = ath10k_htt_rx_amsdu(htt, &info);
+ else
+ ret = ath10k_htt_rx_msdu(htt, &info);
+
+ if (ret && !info.fcs_err) {
+ ath10k_warn("error processing msdus %d\n", ret);
+ dev_kfree_skb_any(info.skb);
+ continue;
+ }
+
+ if (ath10k_htt_rx_hdr_is_amsdu((void *)info.skb->data))
+ ath10k_dbg(ATH10K_DBG_HTT, "htt mpdu is amsdu\n");
+
+ ath10k_dbg_dump(ATH10K_DBG_HTT_DUMP, NULL, "htt mpdu: ",
+ info.skb->data, info.skb->len);
+ ath10k_process_rx(htt->ar, &info);
+ }
+ }
+
+ ath10k_htt_rx_msdu_buff_replenish(htt);
+}
+
+static void ath10k_htt_rx_frag_handler(struct ath10k_htt *htt,
+ struct htt_rx_fragment_indication *frag)
+{
+ struct sk_buff *msdu_head, *msdu_tail;
+ struct htt_rx_desc *rxd;
+ enum rx_msdu_decap_format fmt;
+ struct htt_rx_info info = {};
+ struct ieee80211_hdr *hdr;
+ int msdu_chaining;
+ bool tkip_mic_err;
+ bool decrypt_err;
+ u8 *fw_desc;
+ int fw_desc_len, hdrlen, paramlen;
+ int trim;
+
+ fw_desc_len = __le16_to_cpu(frag->fw_rx_desc_bytes);
+ fw_desc = (u8 *)frag->fw_msdu_rx_desc;
+
+ msdu_head = NULL;
+ msdu_tail = NULL;
+ msdu_chaining = ath10k_htt_rx_amsdu_pop(htt, &fw_desc, &fw_desc_len,
+ &msdu_head, &msdu_tail);
+
+ ath10k_dbg(ATH10K_DBG_HTT_DUMP, "htt rx frag ahead\n");
+
+ if (!msdu_head) {
+ ath10k_warn("htt rx frag no data\n");
+ return;
+ }
+
+ if (msdu_chaining || msdu_head != msdu_tail) {
+ ath10k_warn("aggregation with fragmentation?!\n");
+ ath10k_htt_rx_free_msdu_chain(msdu_head);
+ return;
+ }
+
+ /* FIXME: implement signal strength */
+
+ hdr = (struct ieee80211_hdr *)msdu_head->data;
+ rxd = (void *)msdu_head->data - sizeof(*rxd);
+ tkip_mic_err = !!(__le32_to_cpu(rxd->attention.flags) &
+ RX_ATTENTION_FLAGS_TKIP_MIC_ERR);
+ decrypt_err = !!(__le32_to_cpu(rxd->attention.flags) &
+ RX_ATTENTION_FLAGS_DECRYPT_ERR);
+ fmt = MS(__le32_to_cpu(rxd->msdu_start.info1),
+ RX_MSDU_START_INFO1_DECAP_FORMAT);
+
+ if (fmt != RX_MSDU_DECAP_RAW) {
+ ath10k_warn("we dont support non-raw fragmented rx yet\n");
+ dev_kfree_skb_any(msdu_head);
+ goto end;
+ }
+
+ info.skb = msdu_head;
+ info.status = HTT_RX_IND_MPDU_STATUS_OK;
+ info.encrypt_type = MS(__le32_to_cpu(rxd->mpdu_start.info0),
+ RX_MPDU_START_INFO0_ENCRYPT_TYPE);
+
+ if (tkip_mic_err) {
+ ath10k_warn("tkip mic error\n");
+ info.status = HTT_RX_IND_MPDU_STATUS_TKIP_MIC_ERR;
+ }
+
+ if (decrypt_err) {
+ ath10k_warn("decryption err in fragmented rx\n");
+ dev_kfree_skb_any(info.skb);
+ goto end;
+ }
+
+ if (info.encrypt_type != HTT_RX_MPDU_ENCRYPT_NONE) {
+ hdrlen = ieee80211_hdrlen(hdr->frame_control);
+ paramlen = ath10k_htt_rx_crypto_param_len(info.encrypt_type);
+
+ /* It is more efficient to move the header than the payload */
+ memmove((void *)info.skb->data + paramlen,
+ (void *)info.skb->data,
+ hdrlen);
+ skb_pull(info.skb, paramlen);
+ hdr = (struct ieee80211_hdr *)info.skb->data;
+ }
+
+ /* remove trailing FCS */
+ trim = 4;
+
+ /* remove crypto trailer */
+ trim += ath10k_htt_rx_crypto_tail_len(info.encrypt_type);
+
+ /* last fragment of TKIP frags has MIC */
+ if (!ieee80211_has_morefrags(hdr->frame_control) &&
+ info.encrypt_type == HTT_RX_MPDU_ENCRYPT_TKIP_WPA)
+ trim += 8;
+
+ if (trim > info.skb->len) {
+ ath10k_warn("htt rx fragment: trailer longer than the frame itself? drop\n");
+ dev_kfree_skb_any(info.skb);
+ goto end;
+ }
+
+ skb_trim(info.skb, info.skb->len - trim);
+
+ ath10k_dbg_dump(ATH10K_DBG_HTT_DUMP, NULL, "htt frag mpdu: ",
+ info.skb->data, info.skb->len);
+ ath10k_process_rx(htt->ar, &info);
+
+end:
+ if (fw_desc_len > 0) {
+ ath10k_dbg(ATH10K_DBG_HTT,
+ "expecting more fragmented rx in one indication %d\n",
+ fw_desc_len);
+ }
+}
+
+void ath10k_htt_t2h_msg_handler(struct ath10k *ar, struct sk_buff *skb)
+{
+ struct ath10k_htt *htt = ar->htt;
+ struct htt_resp *resp = (struct htt_resp *)skb->data;
+
+ /* confirm alignment */
+ if (!IS_ALIGNED((unsigned long)skb->data, 4))
+ ath10k_warn("unaligned htt message, expect trouble\n");
+
+ ath10k_dbg(ATH10K_DBG_HTT, "HTT RX, msg_type: 0x%0X\n",
+ resp->hdr.msg_type);
+ switch (resp->hdr.msg_type) {
+ case HTT_T2H_MSG_TYPE_VERSION_CONF: {
+ htt->target_version_major = resp->ver_resp.major;
+ htt->target_version_minor = resp->ver_resp.minor;
+ complete(&htt->target_version_received);
+ break;
+ }
+ case HTT_T2H_MSG_TYPE_RX_IND: {
+ ath10k_htt_rx_handler(htt, &resp->rx_ind);
+ break;
+ }
+ case HTT_T2H_MSG_TYPE_PEER_MAP: {
+ struct htt_peer_map_event ev = {
+ .vdev_id = resp->peer_map.vdev_id,
+ .peer_id = __le16_to_cpu(resp->peer_map.peer_id),
+ };
+ memcpy(ev.addr, resp->peer_map.addr, sizeof(ev.addr));
+ ath10k_peer_map_event(htt, &ev);
+ break;
+ }
+ case HTT_T2H_MSG_TYPE_PEER_UNMAP: {
+ struct htt_peer_unmap_event ev = {
+ .peer_id = __le16_to_cpu(resp->peer_unmap.peer_id),
+ };
+ ath10k_peer_unmap_event(htt, &ev);
+ break;
+ }
+ case HTT_T2H_MSG_TYPE_MGMT_TX_COMPLETION: {
+ struct htt_tx_done tx_done = {};
+ int status = __le32_to_cpu(resp->mgmt_tx_completion.status);
+
+ tx_done.msdu_id =
+ __le32_to_cpu(resp->mgmt_tx_completion.desc_id);
+
+ switch (status) {
+ case HTT_MGMT_TX_STATUS_OK:
+ break;
+ case HTT_MGMT_TX_STATUS_RETRY:
+ tx_done.no_ack = true;
+ break;
+ case HTT_MGMT_TX_STATUS_DROP:
+ tx_done.discard = true;
+ break;
+ }
+
+ ath10k_txrx_tx_completed(htt, &tx_done);
+ break;
+ }
+ case HTT_T2H_MSG_TYPE_TX_COMPL_IND: {
+ struct htt_tx_done tx_done = {};
+ int status = MS(resp->data_tx_completion.flags,
+ HTT_DATA_TX_STATUS);
+ __le16 msdu_id;
+ int i;
+
+ switch (status) {
+ case HTT_DATA_TX_STATUS_NO_ACK:
+ tx_done.no_ack = true;
+ break;
+ case HTT_DATA_TX_STATUS_OK:
+ break;
+ case HTT_DATA_TX_STATUS_DISCARD:
+ case HTT_DATA_TX_STATUS_POSTPONE:
+ case HTT_DATA_TX_STATUS_DOWNLOAD_FAIL:
+ tx_done.discard = true;
+ break;
+ default:
+ ath10k_warn("unhandled tx completion status %d\n",
+ status);
+ tx_done.discard = true;
+ break;
+ }
+
+ ath10k_dbg(ATH10K_DBG_HTT, "htt tx completion num_msdus %d\n",
+ resp->data_tx_completion.num_msdus);
+
+ for (i = 0; i < resp->data_tx_completion.num_msdus; i++) {
+ msdu_id = resp->data_tx_completion.msdus[i];
+ tx_done.msdu_id = __le16_to_cpu(msdu_id);
+ ath10k_txrx_tx_completed(htt, &tx_done);
+ }
+ break;
+ }
+ case HTT_T2H_MSG_TYPE_SEC_IND: {
+ struct ath10k *ar = htt->ar;
+ struct htt_security_indication *ev = &resp->security_indication;
+
+ ath10k_dbg(ATH10K_DBG_HTT,
+ "sec ind peer_id %d unicast %d type %d\n",
+ __le16_to_cpu(ev->peer_id),
+ !!(ev->flags & HTT_SECURITY_IS_UNICAST),
+ MS(ev->flags, HTT_SECURITY_TYPE));
+ complete(&ar->install_key_done);
+ break;
+ }
+ case HTT_T2H_MSG_TYPE_RX_FRAG_IND: {
+ ath10k_dbg_dump(ATH10K_DBG_HTT_DUMP, NULL, "htt event: ",
+ skb->data, skb->len);
+ ath10k_htt_rx_frag_handler(htt, &resp->rx_frag_ind);
+ break;
+ }
+ case HTT_T2H_MSG_TYPE_TEST:
+ /* FIX THIS */
+ break;
+ case HTT_T2H_MSG_TYPE_TX_INSPECT_IND:
+ case HTT_T2H_MSG_TYPE_STATS_CONF:
+ case HTT_T2H_MSG_TYPE_RX_ADDBA:
+ case HTT_T2H_MSG_TYPE_RX_DELBA:
+ case HTT_T2H_MSG_TYPE_RX_FLUSH:
+ default:
+ ath10k_dbg(ATH10K_DBG_HTT, "htt event (%d) not handled\n",
+ resp->hdr.msg_type);
+ ath10k_dbg_dump(ATH10K_DBG_HTT_DUMP, NULL, "htt event: ",
+ skb->data, skb->len);
+ break;
+ };
+
+ /* Free the indication buffer */
+ dev_kfree_skb_any(skb);
+}
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