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iwlwifi: mvm: enable TCP/UDP checksum support for 9000 family

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Declare and enable support of RX and TX checksum for 9000 family.
Configure offload_assist in the TX cmd accordingly to support
TX csum.

Signed-off-by: Sara Sharon <sara.sharon@intel.com>
Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
This commit is contained in:
Sara Sharon 2016-03-10 17:40:56 +02:00 committed by Emmanuel Grumbach
parent 728e825f81
commit 5e6a98dc48
4 changed files with 133 additions and 7 deletions
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1
drivers/net/wireless/intel/iwlwifi/iwl-9000.c
View File

@ -137,6 +137,7 @@ static const struct iwl_tt_params iwl9000_tt_params = {
.dccm2_len = IWL9000_DCCM2_LEN, \
.smem_offset = IWL9000_SMEM_OFFSET, \
.smem_len = IWL9000_SMEM_LEN, \
.features = IWL_TX_CSUM_NETIF_FLAGS | NETIF_F_RXCSUM, \
.thermal_params = &iwl9000_tt_params, \
.apmg_not_supported = true, \
.mq_rx_supported = true, \

2
drivers/net/wireless/intel/iwlwifi/iwl-config.h
View File

@ -131,6 +131,8 @@ enum iwl_led_mode {
#define IWL_MAX_WD_TIMEOUT 120000
#define IWL_DEFAULT_MAX_TX_POWER 22
#define IWL_TX_CSUM_NETIF_FLAGS (NETIF_F_IPV6_CSUM | NETIF_F_IP_CSUM |\
NETIF_F_TSO | NETIF_F_TSO6)
/* Antenna presence definitions */
#define ANT_NONE 0x0

13
drivers/net/wireless/intel/iwlwifi/mvm/mac80211.c
View File

@ -665,12 +665,13 @@ int iwl_mvm_mac_setup_register(struct iwl_mvm *mvm)
}
hw->netdev_features |= mvm->cfg->features;
if (!iwl_mvm_is_csum_supported(mvm))
hw->netdev_features &= ~NETIF_F_RXCSUM;
if (IWL_MVM_SW_TX_CSUM_OFFLOAD)
hw->netdev_features |= NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM |
NETIF_F_TSO | NETIF_F_TSO6;
if (!iwl_mvm_is_csum_supported(mvm)) {
hw->netdev_features &= ~(IWL_TX_CSUM_NETIF_FLAGS |
NETIF_F_RXCSUM);
/* We may support SW TX CSUM */
if (IWL_MVM_SW_TX_CSUM_OFFLOAD)
hw->netdev_features |= IWL_TX_CSUM_NETIF_FLAGS;
}
ret = ieee80211_register_hw(mvm->hw);
if (ret)

124
drivers/net/wireless/intel/iwlwifi/mvm/tx.c
View File

@ -67,6 +67,7 @@
#include <linux/etherdevice.h>
#include <linux/tcp.h>
#include <net/ip.h>
#include <net/ipv6.h>
#include "iwl-trans.h"
#include "iwl-eeprom-parse.h"
@ -98,6 +99,111 @@ iwl_mvm_bar_check_trigger(struct iwl_mvm *mvm, const u8 *addr,
addr, tid, ssn);
}
#define OPT_HDR(type, skb, off) \
(type *)(skb_network_header(skb) + (off))
static void iwl_mvm_tx_csum(struct iwl_mvm *mvm, struct sk_buff *skb,
struct ieee80211_hdr *hdr,
struct ieee80211_tx_info *info,
struct iwl_tx_cmd *tx_cmd)
{
#if IS_ENABLED(CONFIG_INET)
u16 mh_len = ieee80211_hdrlen(hdr->frame_control);
u16 offload_assist = le16_to_cpu(tx_cmd->offload_assist);
u8 protocol = 0;
/*
* Do not compute checksum if already computed or if transport will
* compute it
*/
if (skb->ip_summed != CHECKSUM_PARTIAL || IWL_MVM_SW_TX_CSUM_OFFLOAD)
return;
/* We do not expect to be requested to csum stuff we do not support */
if (WARN_ONCE(!(mvm->hw->netdev_features & IWL_TX_CSUM_NETIF_FLAGS) ||
(skb->protocol != htons(ETH_P_IP) &&
skb->protocol != htons(ETH_P_IPV6)),
"No support for requested checksum\n")) {
skb_checksum_help(skb);
return;
}
if (skb->protocol == htons(ETH_P_IP)) {
protocol = ip_hdr(skb)->protocol;
} else {
#if IS_ENABLED(CONFIG_IPV6)
struct ipv6hdr *ipv6h =
(struct ipv6hdr *)skb_network_header(skb);
unsigned int off = sizeof(*ipv6h);
protocol = ipv6h->nexthdr;
while (protocol != NEXTHDR_NONE && ipv6_ext_hdr(protocol)) {
/* only supported extension headers */
if (protocol != NEXTHDR_ROUTING &&
protocol != NEXTHDR_HOP &&
protocol != NEXTHDR_DEST &&
protocol != NEXTHDR_FRAGMENT) {
skb_checksum_help(skb);
return;
}
if (protocol == NEXTHDR_FRAGMENT) {
struct frag_hdr *hp =
OPT_HDR(struct frag_hdr, skb, off);
protocol = hp->nexthdr;
off += sizeof(struct frag_hdr);
} else {
struct ipv6_opt_hdr *hp =
OPT_HDR(struct ipv6_opt_hdr, skb, off);
protocol = hp->nexthdr;
off += ipv6_optlen(hp);
}
}
/* if we get here - protocol now should be TCP/UDP */
#endif
}
if (protocol != IPPROTO_TCP && protocol != IPPROTO_UDP) {
WARN_ON_ONCE(1);
skb_checksum_help(skb);
return;
}
/* enable L4 csum */
offload_assist |= BIT(TX_CMD_OFFLD_L4_EN);
/*
* Set offset to IP header (snap).
* We don't support tunneling so no need to take care of inner header.
* Size is in words.
*/
offload_assist |= (4 << TX_CMD_OFFLD_IP_HDR);
/* Do IPv4 csum for AMSDU only (no IP csum for Ipv6) */
if (skb->protocol == htons(ETH_P_IP) &&
(offload_assist & BIT(TX_CMD_OFFLD_AMSDU))) {
ip_hdr(skb)->check = 0;
offload_assist |= BIT(TX_CMD_OFFLD_L3_EN);
}
/* reset UDP/TCP header csum */
if (protocol == IPPROTO_TCP)
tcp_hdr(skb)->check = 0;
else
udp_hdr(skb)->check = 0;
/* mac header len should include IV, size is in words */
if (info->control.hw_key)
mh_len += info->control.hw_key->iv_len;
mh_len /= 2;
offload_assist |= mh_len << TX_CMD_OFFLD_MH_SIZE;
tx_cmd->offload_assist = cpu_to_le16(offload_assist);
#endif
}
/*
* Sets most of the Tx cmd's fields
*/
@ -196,6 +302,8 @@ void iwl_mvm_set_tx_cmd(struct iwl_mvm *mvm, struct sk_buff *skb,
if (ieee80211_hdrlen(fc) % 4 &&
!(tx_cmd->offload_assist & cpu_to_le16(BIT(TX_CMD_OFFLD_AMSDU))))
tx_cmd->offload_assist |= cpu_to_le16(BIT(TX_CMD_OFFLD_PAD));
iwl_mvm_tx_csum(mvm, skb, hdr, info, tx_cmd);
}
/*
@ -466,6 +574,7 @@ static int iwl_mvm_tx_tso(struct iwl_mvm *mvm, struct sk_buff *skb,
u16 ip_base_id = ipv4 ? ntohs(ip_hdr(skb)->id) : 0;
u16 amsdu_add, snap_ip_tcp, pad, i = 0;
unsigned int dbg_max_amsdu_len;
netdev_features_t netdev_features = NETIF_F_CSUM_MASK | NETIF_F_SG;
u8 *qc, tid, txf;
snap_ip_tcp = 8 + skb_transport_header(skb) - skb_network_header(skb) +
@ -484,6 +593,19 @@ static int iwl_mvm_tx_tso(struct iwl_mvm *mvm, struct sk_buff *skb,
goto segment;
}
/*
* Do not build AMSDU for IPv6 with extension headers.
* ask stack to segment and checkum the generated MPDUs for us.
*/
if (skb->protocol == htons(ETH_P_IPV6) &&
((struct ipv6hdr *)skb_network_header(skb))->nexthdr !=
IPPROTO_TCP) {
num_subframes = 1;
pad = 0;
netdev_features &= ~NETIF_F_CSUM_MASK;
goto segment;
}
/*
* No need to lock amsdu_in_ampdu_allowed since it can't be modified
* during an BA session.
@ -577,7 +699,7 @@ static int iwl_mvm_tx_tso(struct iwl_mvm *mvm, struct sk_buff *skb,
skb_shinfo(skb)->gso_size = num_subframes * mss;
memcpy(cb, skb->cb, sizeof(cb));
next = skb_gso_segment(skb, NETIF_F_CSUM_MASK | NETIF_F_SG);
next = skb_gso_segment(skb, netdev_features);
skb_shinfo(skb)->gso_size = mss;
if (WARN_ON_ONCE(IS_ERR(next)))
return -EINVAL;