From 7d13a7d0da74d127457cc6f88e47fd8e85960a13 Mon Sep 17 00:00:00 2001 From: Alexander Duyck Date: Fri, 26 Aug 2011 07:44:32 +0000 Subject: [PATCH] igb: Consolidate creation of Tx context descriptors into a single function This patch is meant to simplify the transmit path by reducing the overhead for creating a transmit context descriptor. The current implementation is split with igb_tso and igb_tx_csum doing two separate implementations on how to setup the tx_buffer_info structure and the tx_desc. By combining them it is possible to reduce code and simplify things since now only one function will create context descriptors. Signed-off-by: Alexander Duyck Tested-by: Aaron Brown Signed-off-by: Jeff Kirsher --- drivers/net/ethernet/intel/igb/igb_main.c | 233 ++++++++++------------ 1 file changed, 106 insertions(+), 127 deletions(-) diff --git a/drivers/net/ethernet/intel/igb/igb_main.c b/drivers/net/ethernet/intel/igb/igb_main.c index 2bdc78368b6..a0bb81d9ef1 100644 --- a/drivers/net/ethernet/intel/igb/igb_main.c +++ b/drivers/net/ethernet/intel/igb/igb_main.c @@ -45,6 +45,9 @@ #include #include #include +#include +#include +#include #include #include #include @@ -3960,16 +3963,39 @@ set_itr_now: #define IGB_TX_FLAGS_VLAN_MASK 0xffff0000 #define IGB_TX_FLAGS_VLAN_SHIFT 16 +void igb_tx_ctxtdesc(struct igb_ring *tx_ring, u32 vlan_macip_lens, + u32 type_tucmd, u32 mss_l4len_idx) +{ + struct e1000_adv_tx_context_desc *context_desc; + u16 i = tx_ring->next_to_use; + + context_desc = IGB_TX_CTXTDESC(tx_ring, i); + + i++; + tx_ring->next_to_use = (i < tx_ring->count) ? i : 0; + + /* set bits to identify this as an advanced context descriptor */ + type_tucmd |= E1000_TXD_CMD_DEXT | E1000_ADVTXD_DTYP_CTXT; + + /* For 82575, context index must be unique per ring. */ + if (tx_ring->flags & IGB_RING_FLAG_TX_CTX_IDX) + mss_l4len_idx |= tx_ring->reg_idx << 4; + + context_desc->vlan_macip_lens = cpu_to_le32(vlan_macip_lens); + context_desc->seqnum_seed = 0; + context_desc->type_tucmd_mlhl = cpu_to_le32(type_tucmd); + context_desc->mss_l4len_idx = cpu_to_le32(mss_l4len_idx); +} + static inline int igb_tso(struct igb_ring *tx_ring, struct sk_buff *skb, u32 tx_flags, u8 *hdr_len) { - struct e1000_adv_tx_context_desc *context_desc; - unsigned int i; int err; - struct igb_tx_buffer *buffer_info; - u32 info = 0, tu_cmd = 0; - u32 mss_l4len_idx; - u8 l4len; + u32 vlan_macip_lens, type_tucmd; + u32 mss_l4len_idx, l4len; + + if (!skb_is_gso(skb)) + return 0; if (skb_header_cloned(skb)) { err = pskb_expand_head(skb, 0, 0, GFP_ATOMIC); @@ -3977,8 +4003,8 @@ static inline int igb_tso(struct igb_ring *tx_ring, return err; } - l4len = tcp_hdrlen(skb); - *hdr_len += l4len; + /* ADV DTYP TUCMD MKRLOC/ISCSIHEDLEN */ + type_tucmd = E1000_ADVTXD_TUCMD_L4T_TCP; if (skb->protocol == htons(ETH_P_IP)) { struct iphdr *iph = ip_hdr(skb); @@ -3988,6 +4014,7 @@ static inline int igb_tso(struct igb_ring *tx_ring, iph->daddr, 0, IPPROTO_TCP, 0); + type_tucmd |= E1000_ADVTXD_TUCMD_IPV4; } else if (skb_is_gso_v6(skb)) { ipv6_hdr(skb)->payload_len = 0; tcp_hdr(skb)->check = ~csum_ipv6_magic(&ipv6_hdr(skb)->saddr, @@ -3995,131 +4022,85 @@ static inline int igb_tso(struct igb_ring *tx_ring, 0, IPPROTO_TCP, 0); } - i = tx_ring->next_to_use; - - buffer_info = &tx_ring->tx_buffer_info[i]; - context_desc = IGB_TX_CTXTDESC(tx_ring, i); - /* VLAN MACLEN IPLEN */ - if (tx_flags & IGB_TX_FLAGS_VLAN) - info |= (tx_flags & IGB_TX_FLAGS_VLAN_MASK); - info |= (skb_network_offset(skb) << E1000_ADVTXD_MACLEN_SHIFT); - *hdr_len += skb_network_offset(skb); - info |= skb_network_header_len(skb); - *hdr_len += skb_network_header_len(skb); - context_desc->vlan_macip_lens = cpu_to_le32(info); - - /* ADV DTYP TUCMD MKRLOC/ISCSIHEDLEN */ - tu_cmd |= (E1000_TXD_CMD_DEXT | E1000_ADVTXD_DTYP_CTXT); - - if (skb->protocol == htons(ETH_P_IP)) - tu_cmd |= E1000_ADVTXD_TUCMD_IPV4; - tu_cmd |= E1000_ADVTXD_TUCMD_L4T_TCP; - - context_desc->type_tucmd_mlhl = cpu_to_le32(tu_cmd); + l4len = tcp_hdrlen(skb); + *hdr_len = skb_transport_offset(skb) + l4len; /* MSS L4LEN IDX */ - mss_l4len_idx = (skb_shinfo(skb)->gso_size << E1000_ADVTXD_MSS_SHIFT); - mss_l4len_idx |= (l4len << E1000_ADVTXD_L4LEN_SHIFT); + mss_l4len_idx = l4len << E1000_ADVTXD_L4LEN_SHIFT; + mss_l4len_idx |= skb_shinfo(skb)->gso_size << E1000_ADVTXD_MSS_SHIFT; - /* For 82575, context index must be unique per ring. */ - if (tx_ring->flags & IGB_RING_FLAG_TX_CTX_IDX) - mss_l4len_idx |= tx_ring->reg_idx << 4; - - context_desc->mss_l4len_idx = cpu_to_le32(mss_l4len_idx); - context_desc->seqnum_seed = 0; - - buffer_info->time_stamp = jiffies; - buffer_info->next_to_watch = i; - buffer_info->dma = 0; - i++; - if (i == tx_ring->count) - i = 0; + /* VLAN MACLEN IPLEN */ + vlan_macip_lens = skb_network_header_len(skb); + vlan_macip_lens |= skb_network_offset(skb) << E1000_ADVTXD_MACLEN_SHIFT; + vlan_macip_lens |= tx_flags & IGB_TX_FLAGS_VLAN_MASK; - tx_ring->next_to_use = i; + igb_tx_ctxtdesc(tx_ring, vlan_macip_lens, type_tucmd, mss_l4len_idx); - return true; + return 1; } static inline bool igb_tx_csum(struct igb_ring *tx_ring, struct sk_buff *skb, u32 tx_flags) { - struct e1000_adv_tx_context_desc *context_desc; - struct device *dev = tx_ring->dev; - struct igb_tx_buffer *buffer_info; - u32 info = 0, tu_cmd = 0; - unsigned int i; - - if ((skb->ip_summed == CHECKSUM_PARTIAL) || - (tx_flags & IGB_TX_FLAGS_VLAN)) { - i = tx_ring->next_to_use; - buffer_info = &tx_ring->tx_buffer_info[i]; - context_desc = IGB_TX_CTXTDESC(tx_ring, i); - - if (tx_flags & IGB_TX_FLAGS_VLAN) - info |= (tx_flags & IGB_TX_FLAGS_VLAN_MASK); - - info |= (skb_network_offset(skb) << E1000_ADVTXD_MACLEN_SHIFT); - if (skb->ip_summed == CHECKSUM_PARTIAL) - info |= skb_network_header_len(skb); - - context_desc->vlan_macip_lens = cpu_to_le32(info); - - tu_cmd |= (E1000_TXD_CMD_DEXT | E1000_ADVTXD_DTYP_CTXT); - - if (skb->ip_summed == CHECKSUM_PARTIAL) { - __be16 protocol; + u32 vlan_macip_lens = 0; + u32 mss_l4len_idx = 0; + u32 type_tucmd = 0; - if (skb->protocol == cpu_to_be16(ETH_P_8021Q)) { - const struct vlan_ethhdr *vhdr = - (const struct vlan_ethhdr*)skb->data; - - protocol = vhdr->h_vlan_encapsulated_proto; - } else { - protocol = skb->protocol; + if (skb->ip_summed != CHECKSUM_PARTIAL) { + if (!(tx_flags & IGB_TX_FLAGS_VLAN)) + return false; + } else { + u8 l4_hdr = 0; + switch (skb->protocol) { + case __constant_htons(ETH_P_IP): + vlan_macip_lens |= skb_network_header_len(skb); + type_tucmd |= E1000_ADVTXD_TUCMD_IPV4; + l4_hdr = ip_hdr(skb)->protocol; + break; + case __constant_htons(ETH_P_IPV6): + vlan_macip_lens |= skb_network_header_len(skb); + l4_hdr = ipv6_hdr(skb)->nexthdr; + break; + default: + if (unlikely(net_ratelimit())) { + dev_warn(tx_ring->dev, + "partial checksum but proto=%x!\n", + skb->protocol); } + break; + } - switch (protocol) { - case cpu_to_be16(ETH_P_IP): - tu_cmd |= E1000_ADVTXD_TUCMD_IPV4; - if (ip_hdr(skb)->protocol == IPPROTO_TCP) - tu_cmd |= E1000_ADVTXD_TUCMD_L4T_TCP; - else if (ip_hdr(skb)->protocol == IPPROTO_SCTP) - tu_cmd |= E1000_ADVTXD_TUCMD_L4T_SCTP; - break; - case cpu_to_be16(ETH_P_IPV6): - /* XXX what about other V6 headers?? */ - if (ipv6_hdr(skb)->nexthdr == IPPROTO_TCP) - tu_cmd |= E1000_ADVTXD_TUCMD_L4T_TCP; - else if (ipv6_hdr(skb)->nexthdr == IPPROTO_SCTP) - tu_cmd |= E1000_ADVTXD_TUCMD_L4T_SCTP; - break; - default: - if (unlikely(net_ratelimit())) - dev_warn(dev, - "partial checksum but proto=%x!\n", - skb->protocol); - break; + switch (l4_hdr) { + case IPPROTO_TCP: + type_tucmd |= E1000_ADVTXD_TUCMD_L4T_TCP; + mss_l4len_idx = tcp_hdrlen(skb) << + E1000_ADVTXD_L4LEN_SHIFT; + break; + case IPPROTO_SCTP: + type_tucmd |= E1000_ADVTXD_TUCMD_L4T_SCTP; + mss_l4len_idx = sizeof(struct sctphdr) << + E1000_ADVTXD_L4LEN_SHIFT; + break; + case IPPROTO_UDP: + mss_l4len_idx = sizeof(struct udphdr) << + E1000_ADVTXD_L4LEN_SHIFT; + break; + default: + if (unlikely(net_ratelimit())) { + dev_warn(tx_ring->dev, + "partial checksum but l4 proto=%x!\n", + l4_hdr); } + break; } + } - context_desc->type_tucmd_mlhl = cpu_to_le32(tu_cmd); - context_desc->seqnum_seed = 0; - if (tx_ring->flags & IGB_RING_FLAG_TX_CTX_IDX) - context_desc->mss_l4len_idx = - cpu_to_le32(tx_ring->reg_idx << 4); + vlan_macip_lens |= skb_network_offset(skb) << E1000_ADVTXD_MACLEN_SHIFT; + vlan_macip_lens |= tx_flags & IGB_TX_FLAGS_VLAN_MASK; - buffer_info->time_stamp = jiffies; - buffer_info->next_to_watch = i; - buffer_info->dma = 0; + igb_tx_ctxtdesc(tx_ring, vlan_macip_lens, type_tucmd, mss_l4len_idx); - i++; - if (i == tx_ring->count) - i = 0; - tx_ring->next_to_use = i; - - return true; - } - return false; + return (skb->ip_summed == CHECKSUM_PARTIAL); } #define IGB_MAX_TXD_PWR 16 @@ -4140,8 +4121,6 @@ static inline int igb_tx_map(struct igb_ring *tx_ring, struct sk_buff *skb, buffer_info = &tx_ring->tx_buffer_info[i]; BUG_ON(hlen >= IGB_MAX_DATA_PER_TXD); buffer_info->length = hlen; - /* set time_stamp *before* dma to help avoid a possible race */ - buffer_info->time_stamp = jiffies; buffer_info->next_to_watch = i; buffer_info->dma = dma_map_single(dev, skb->data, hlen, DMA_TO_DEVICE); @@ -4160,7 +4139,6 @@ static inline int igb_tx_map(struct igb_ring *tx_ring, struct sk_buff *skb, buffer_info = &tx_ring->tx_buffer_info[i]; BUG_ON(len >= IGB_MAX_DATA_PER_TXD); buffer_info->length = len; - buffer_info->time_stamp = jiffies; buffer_info->next_to_watch = i; buffer_info->mapped_as_page = true; buffer_info->dma = skb_frag_dma_map(dev, frag, 0, len, @@ -4176,6 +4154,7 @@ static inline int igb_tx_map(struct igb_ring *tx_ring, struct sk_buff *skb, buffer_info->bytecount = ((gso_segs - 1) * hlen) + skb->len; buffer_info->gso_segs = gso_segs; tx_ring->tx_buffer_info[first].next_to_watch = i; + tx_ring->tx_buffer_info[first].time_stamp = jiffies; return ++count; @@ -4304,7 +4283,7 @@ static inline int igb_maybe_stop_tx(struct igb_ring *tx_ring, int size) netdev_tx_t igb_xmit_frame_ring(struct sk_buff *skb, struct igb_ring *tx_ring) { - int tso = 0, count; + int tso, count; u32 tx_flags = 0; u16 first; u8 hdr_len = 0; @@ -4333,16 +4312,12 @@ netdev_tx_t igb_xmit_frame_ring(struct sk_buff *skb, tx_flags |= IGB_TX_FLAGS_IPV4; first = tx_ring->next_to_use; - if (skb_is_gso(skb)) { - tso = igb_tso(tx_ring, skb, tx_flags, &hdr_len); - if (tso < 0) { - dev_kfree_skb_any(skb); - return NETDEV_TX_OK; - } - } + tso = igb_tso(tx_ring, skb, tx_flags, &hdr_len); - if (tso) + if (tso < 0) + goto out_drop; + else if (tso) tx_flags |= IGB_TX_FLAGS_TSO; else if (igb_tx_csum(tx_ring, skb, tx_flags) && (skb->ip_summed == CHECKSUM_PARTIAL)) @@ -4366,6 +4341,10 @@ netdev_tx_t igb_xmit_frame_ring(struct sk_buff *skb, igb_maybe_stop_tx(tx_ring, MAX_SKB_FRAGS + 4); return NETDEV_TX_OK; + +out_drop: + dev_kfree_skb_any(skb); + return NETDEV_TX_OK; } static inline struct igb_ring *igb_tx_queue_mapping(struct igb_adapter *adapter, -- 2.39.5