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linux/drivers/net/wireless/ath/ath10k/htt_rx.c

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/*
* 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 "core.h"
#include "htc.h"
#include "htt.h"
#include "txrx.h"
#include "debug.h"
#include "trace.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)) {
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);
}
/* When fmt == RX_MSDU_DECAP_8023_SNAP_LLC:
*
* SNAP 802.3 consists of:
* [dst:6][src:6][len:2][dsap:1][ssap:1][ctl:1][snap:5]
* [data][fcs:4].
*
* Since this overlaps with A-MSDU header (da, sa, len)
* there's nothing extra to do. */
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 int ath10k_htt_rx_get_csum_state(struct sk_buff *skb)
{
struct htt_rx_desc *rxd;
u32 flags, info;
bool is_ip4, is_ip6;
bool is_tcp, is_udp;
bool ip_csum_ok, tcpudp_csum_ok;
rxd = (void *)skb->data - sizeof(*rxd);
flags = __le32_to_cpu(rxd->attention.flags);
info = __le32_to_cpu(rxd->msdu_start.info1);
is_ip4 = !!(info & RX_MSDU_START_INFO1_IPV4_PROTO);
is_ip6 = !!(info & RX_MSDU_START_INFO1_IPV6_PROTO);
is_tcp = !!(info & RX_MSDU_START_INFO1_TCP_PROTO);
is_udp = !!(info & RX_MSDU_START_INFO1_UDP_PROTO);
ip_csum_ok = !(flags & RX_ATTENTION_FLAGS_IP_CHKSUM_FAIL);
tcpudp_csum_ok = !(flags & RX_ATTENTION_FLAGS_TCP_UDP_CHKSUM_FAIL);
if (!is_ip4 && !is_ip6)
return CHECKSUM_NONE;
if (!is_tcp && !is_udp)
return CHECKSUM_NONE;
if (!ip_csum_ok)
return CHECKSUM_NONE;
if (!tcpudp_csum_ok)
return CHECKSUM_NONE;
return CHECKSUM_UNNECESSARY;
}
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;
int ip_summed;
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;
}
/* The skb is not yet processed and it may be
* reallocated. Since the offload is in the original
* skb extract the checksum now and assign it later */
ip_summed = ath10k_htt_rx_get_csum_state(msdu_head);
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");
info.skb->ip_summed = ip_summed;
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);
info.skb->ip_summed = ath10k_htt_rx_get_csum_state(info.skb);
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_STATS_CONF:
trace_ath10k_htt_stats(skb->data, skb->len);
break;
case HTT_T2H_MSG_TYPE_TX_INSPECT_IND:
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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