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ath10k: implement rx checksum offloading

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HW supports L3/L4 rx checksum offloading.

This should reduce CPU load and improve
performance on slow host machines.

Signed-off-by: Michal Kazior <michal.kazior@tieto.com>
Signed-off-by: Kalle Valo <kvalo@qca.qualcomm.com>
This commit is contained in:
Michal Kazior 2013-07-31 10:47:56 +02:00 committed by Kalle Valo
parent 8865bee483
commit 605f81aae7
1 changed files with 40 additions and 0 deletions
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40
drivers/net/wireless/ath/ath10k/htt_rx.c
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@ -804,6 +804,37 @@ static bool ath10k_htt_rx_has_fcs_err(struct sk_buff *skb)
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)
{
@ -815,6 +846,7 @@ static void ath10k_htt_rx_handler(struct ath10k_htt *htt,
u8 *fw_desc;
int i, j;
int ret;
int ip_summed;
memset(&info, 0, sizeof(info));
@ -889,6 +921,11 @@ static void ath10k_htt_rx_handler(struct ath10k_htt *htt,
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;
@ -914,6 +951,8 @@ static void ath10k_htt_rx_handler(struct ath10k_htt *htt,
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);
@ -980,6 +1019,7 @@ static void ath10k_htt_rx_frag_handler(struct ath10k_htt *htt,
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");