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Message-Id: <1301702836-3265-4-git-send-email-anirban.chakraborty@qlogic.com>
Date: Fri, 1 Apr 2011 17:07:11 -0700
From: anirban.chakraborty@...gic.com
To: netdev@...r.kernel.org
Cc: davem@...emloft.com, Dept_NX_Linux_NIC_driver@...gic.com,
Anirban Chakraborty <anirban.chakraborty@...gic.com>
Subject: [PATCH 4/9 net-next-2.6] qlcnic: Code optimization patch
From: Anirban Chakraborty <anirban.chakraborty@...gic.com>
Optimized code resulted in achieving lower CPU utilization on transmit path
and higher throughput for small packet sizes (64 bytes).
Signed-off-by: Anirban Chakraborty <anirban.chakraborty@...gic.com>
---
drivers/net/qlcnic/qlcnic.h | 30 +++---
drivers/net/qlcnic/qlcnic_main.c | 210 ++++++++++++++++++--------------------
2 files changed, 115 insertions(+), 125 deletions(-)
diff --git a/drivers/net/qlcnic/qlcnic.h b/drivers/net/qlcnic/qlcnic.h
index 15d950a..a5b28d1 100644
--- a/drivers/net/qlcnic/qlcnic.h
+++ b/drivers/net/qlcnic/qlcnic.h
@@ -434,50 +434,49 @@ struct qlcnic_adapter_stats {
* be one Rcv Descriptor for normal packets, one for jumbo and may be others.
*/
struct qlcnic_host_rds_ring {
- u32 producer;
+ void __iomem *crb_rcv_producer;
+ struct rcv_desc *desc_head;
+ struct qlcnic_rx_buffer *rx_buf_arr;
u32 num_desc;
+ u32 producer;
u32 dma_size;
u32 skb_size;
u32 flags;
- void __iomem *crb_rcv_producer;
- struct rcv_desc *desc_head;
- struct qlcnic_rx_buffer *rx_buf_arr;
struct list_head free_list;
spinlock_t lock;
dma_addr_t phys_addr;
-};
+} ____cacheline_internodealigned_in_smp;
struct qlcnic_host_sds_ring {
u32 consumer;
u32 num_desc;
void __iomem *crb_sts_consumer;
- void __iomem *crb_intr_mask;
struct status_desc *desc_head;
struct qlcnic_adapter *adapter;
struct napi_struct napi;
struct list_head free_list[NUM_RCV_DESC_RINGS];
+ void __iomem *crb_intr_mask;
int irq;
dma_addr_t phys_addr;
char name[IFNAMSIZ+4];
-};
+} ____cacheline_internodealigned_in_smp;
struct qlcnic_host_tx_ring {
u32 producer;
- __le32 *hw_consumer;
u32 sw_consumer;
- void __iomem *crb_cmd_producer;
u32 num_desc;
-
- struct netdev_queue *txq;
-
- struct qlcnic_cmd_buffer *cmd_buf_arr;
+ void __iomem *crb_cmd_producer;
struct cmd_desc_type0 *desc_head;
+ struct qlcnic_cmd_buffer *cmd_buf_arr;
+ __le32 *hw_consumer;
+
dma_addr_t phys_addr;
dma_addr_t hw_cons_phys_addr;
-};
+ struct netdev_queue *txq;
+} ____cacheline_internodealigned_in_smp;
/*
* Receive context. There is one such structure per instance of the
@@ -1328,8 +1327,7 @@ static const struct qlcnic_brdinfo qlcnic_boards[] = {
static inline u32 qlcnic_tx_avail(struct qlcnic_host_tx_ring *tx_ring)
{
- smp_mb();
- if (tx_ring->producer < tx_ring->sw_consumer)
+ if (likely(tx_ring->producer < tx_ring->sw_consumer))
return tx_ring->sw_consumer - tx_ring->producer;
else
return tx_ring->sw_consumer + tx_ring->num_desc -
diff --git a/drivers/net/qlcnic/qlcnic_main.c b/drivers/net/qlcnic/qlcnic_main.c
index dde7e44..3b740f5 100644
--- a/drivers/net/qlcnic/qlcnic_main.c
+++ b/drivers/net/qlcnic/qlcnic_main.c
@@ -1861,6 +1861,7 @@ static void qlcnic_change_filter(struct qlcnic_adapter *adapter,
vlan_req->vlan_id = vlan_id;
tx_ring->producer = get_next_index(producer, tx_ring->num_desc);
+ smp_mb();
}
#define QLCNIC_MAC_HASH(MAC)\
@@ -1921,58 +1922,122 @@ qlcnic_send_filter(struct qlcnic_adapter *adapter,
spin_unlock(&adapter->mac_learn_lock);
}
-static void
-qlcnic_tso_check(struct net_device *netdev,
- struct qlcnic_host_tx_ring *tx_ring,
+static int
+qlcnic_tx_pkt(struct qlcnic_adapter *adapter,
struct cmd_desc_type0 *first_desc,
struct sk_buff *skb)
{
- u8 opcode = TX_ETHER_PKT;
- __be16 protocol = skb->protocol;
- u16 flags = 0;
- int copied, offset, copy_len, hdr_len = 0, tso = 0;
+ u8 opcode = 0, hdr_len = 0;
+ u16 flags = 0, vlan_tci = 0;
+ int copied, offset, copy_len;
struct cmd_desc_type0 *hwdesc;
struct vlan_ethhdr *vh;
- struct qlcnic_adapter *adapter = netdev_priv(netdev);
+ struct qlcnic_host_tx_ring *tx_ring = adapter->tx_ring;
+ u16 protocol = ntohs(skb->protocol);
u32 producer = tx_ring->producer;
- __le16 vlan_oob = first_desc->flags_opcode &
- cpu_to_le16(FLAGS_VLAN_OOB);
+
+ if (protocol == ETH_P_8021Q) {
+ vh = (struct vlan_ethhdr *)skb->data;
+ flags = FLAGS_VLAN_TAGGED;
+ vlan_tci = vh->h_vlan_TCI;
+ } else if (vlan_tx_tag_present(skb)) {
+ flags = FLAGS_VLAN_OOB;
+ vlan_tci = vlan_tx_tag_get(skb);
+ }
+ if (unlikely(adapter->pvid)) {
+ if (vlan_tci && !(adapter->flags & QLCNIC_TAGGING_ENABLED))
+ return -EIO;
+ if (vlan_tci && (adapter->flags & QLCNIC_TAGGING_ENABLED))
+ goto set_flags;
+
+ flags = FLAGS_VLAN_OOB;
+ vlan_tci = adapter->pvid;
+ }
+set_flags:
+ qlcnic_set_tx_vlan_tci(first_desc, vlan_tci);
+ qlcnic_set_tx_flags_opcode(first_desc, flags, opcode);
if (*(skb->data) & BIT_0) {
flags |= BIT_0;
memcpy(&first_desc->eth_addr, skb->data, ETH_ALEN);
}
-
- if ((netdev->features & (NETIF_F_TSO | NETIF_F_TSO6)) &&
+ opcode = TX_ETHER_PKT;
+ if ((adapter->netdev->features & (NETIF_F_TSO | NETIF_F_TSO6)) &&
skb_shinfo(skb)->gso_size > 0) {
hdr_len = skb_transport_offset(skb) + tcp_hdrlen(skb);
first_desc->mss = cpu_to_le16(skb_shinfo(skb)->gso_size);
first_desc->total_hdr_length = hdr_len;
- if (vlan_oob) {
+
+ opcode = (protocol == ETH_P_IPV6) ? TX_TCP_LSO6 : TX_TCP_LSO;
+
+ /* For LSO, we need to copy the MAC/IP/TCP headers into
+ * the descriptor ring */
+ copied = 0;
+ offset = 2;
+
+ if (flags & FLAGS_VLAN_OOB) {
first_desc->total_hdr_length += VLAN_HLEN;
first_desc->tcp_hdr_offset = VLAN_HLEN;
first_desc->ip_hdr_offset = VLAN_HLEN;
/* Only in case of TSO on vlan device */
flags |= FLAGS_VLAN_TAGGED;
+
+ /* Create a TSO vlan header template for firmware */
+
+ hwdesc = &tx_ring->desc_head[producer];
+ tx_ring->cmd_buf_arr[producer].skb = NULL;
+
+ copy_len = min((int)sizeof(struct cmd_desc_type0) -
+ offset, hdr_len + VLAN_HLEN);
+
+ vh = (struct vlan_ethhdr *)((char *) hwdesc + 2);
+ skb_copy_from_linear_data(skb, vh, 12);
+ vh->h_vlan_proto = htons(ETH_P_8021Q);
+ vh->h_vlan_TCI = htons(vlan_tci);
+
+ skb_copy_from_linear_data_offset(skb, 12,
+ (char *)vh + 16, copy_len - 16);
+
+ copied = copy_len - VLAN_HLEN;
+ offset = 0;
+
+ producer = get_next_index(producer, tx_ring->num_desc);
}
- opcode = (protocol == cpu_to_be16(ETH_P_IPV6)) ?
- TX_TCP_LSO6 : TX_TCP_LSO;
- tso = 1;
+ while (copied < hdr_len) {
+
+ copy_len = min((int)sizeof(struct cmd_desc_type0) -
+ offset, (hdr_len - copied));
+
+ hwdesc = &tx_ring->desc_head[producer];
+ tx_ring->cmd_buf_arr[producer].skb = NULL;
+
+ skb_copy_from_linear_data_offset(skb, copied,
+ (char *) hwdesc + offset, copy_len);
+
+ copied += copy_len;
+ offset = 0;
+
+ producer = get_next_index(producer, tx_ring->num_desc);
+ }
+
+ tx_ring->producer = producer;
+ smp_mb();
+ adapter->stats.lso_frames++;
} else if (skb->ip_summed == CHECKSUM_PARTIAL) {
u8 l4proto;
- if (protocol == cpu_to_be16(ETH_P_IP)) {
+ if (protocol == ETH_P_IP) {
l4proto = ip_hdr(skb)->protocol;
if (l4proto == IPPROTO_TCP)
opcode = TX_TCP_PKT;
else if (l4proto == IPPROTO_UDP)
opcode = TX_UDP_PKT;
- } else if (protocol == cpu_to_be16(ETH_P_IPV6)) {
+ } else if (protocol == ETH_P_IPV6) {
l4proto = ipv6_hdr(skb)->nexthdr;
if (l4proto == IPPROTO_TCP)
@@ -1981,63 +2046,11 @@ qlcnic_tso_check(struct net_device *netdev,
opcode = TX_UDPV6_PKT;
}
}
-
first_desc->tcp_hdr_offset += skb_transport_offset(skb);
first_desc->ip_hdr_offset += skb_network_offset(skb);
qlcnic_set_tx_flags_opcode(first_desc, flags, opcode);
- if (!tso)
- return;
-
- /* For LSO, we need to copy the MAC/IP/TCP headers into
- * the descriptor ring
- */
- copied = 0;
- offset = 2;
-
- if (vlan_oob) {
- /* Create a TSO vlan header template for firmware */
-
- hwdesc = &tx_ring->desc_head[producer];
- tx_ring->cmd_buf_arr[producer].skb = NULL;
-
- copy_len = min((int)sizeof(struct cmd_desc_type0) - offset,
- hdr_len + VLAN_HLEN);
-
- vh = (struct vlan_ethhdr *)((char *)hwdesc + 2);
- skb_copy_from_linear_data(skb, vh, 12);
- vh->h_vlan_proto = htons(ETH_P_8021Q);
- vh->h_vlan_TCI = (__be16)swab16((u16)first_desc->vlan_TCI);
-
- skb_copy_from_linear_data_offset(skb, 12,
- (char *)vh + 16, copy_len - 16);
-
- copied = copy_len - VLAN_HLEN;
- offset = 0;
-
- producer = get_next_index(producer, tx_ring->num_desc);
- }
-
- while (copied < hdr_len) {
-
- copy_len = min((int)sizeof(struct cmd_desc_type0) - offset,
- (hdr_len - copied));
-
- hwdesc = &tx_ring->desc_head[producer];
- tx_ring->cmd_buf_arr[producer].skb = NULL;
-
- skb_copy_from_linear_data_offset(skb, copied,
- (char *)hwdesc + offset, copy_len);
-
- copied += copy_len;
- offset = 0;
-
- producer = get_next_index(producer, tx_ring->num_desc);
- }
-
- tx_ring->producer = producer;
- barrier();
- adapter->stats.lso_frames++;
+ return 0;
}
static int
@@ -2088,39 +2101,21 @@ out_err:
return -ENOMEM;
}
-static int
-qlcnic_check_tx_tagging(struct qlcnic_adapter *adapter,
- struct sk_buff *skb,
- struct cmd_desc_type0 *first_desc)
+static void
+qlcnic_unmap_buffers(struct pci_dev *pdev, struct sk_buff *skb,
+ struct qlcnic_cmd_buffer *pbuf)
{
- u8 opcode = 0;
- u16 flags = 0;
- __be16 protocol = skb->protocol;
- struct vlan_ethhdr *vh;
+ struct qlcnic_skb_frag *nf = &pbuf->frag_array[0];
+ int nr_frags = skb_shinfo(skb)->nr_frags;
+ int i;
- if (protocol == cpu_to_be16(ETH_P_8021Q)) {
- vh = (struct vlan_ethhdr *)skb->data;
- protocol = vh->h_vlan_encapsulated_proto;
- flags = FLAGS_VLAN_TAGGED;
- qlcnic_set_tx_vlan_tci(first_desc, ntohs(vh->h_vlan_TCI));
- } else if (vlan_tx_tag_present(skb)) {
- flags = FLAGS_VLAN_OOB;
- qlcnic_set_tx_vlan_tci(first_desc, vlan_tx_tag_get(skb));
+ for (i = 0; i < nr_frags; i++) {
+ nf = &pbuf->frag_array[i+1];
+ pci_unmap_page(pdev, nf->dma, nf->length, PCI_DMA_TODEVICE);
}
- if (unlikely(adapter->pvid)) {
- if (first_desc->vlan_TCI &&
- !(adapter->flags & QLCNIC_TAGGING_ENABLED))
- return -EIO;
- if (first_desc->vlan_TCI &&
- (adapter->flags & QLCNIC_TAGGING_ENABLED))
- goto set_flags;
- flags = FLAGS_VLAN_OOB;
- qlcnic_set_tx_vlan_tci(first_desc, adapter->pvid);
- }
-set_flags:
- qlcnic_set_tx_flags_opcode(first_desc, flags, opcode);
- return 0;
+ nf = &pbuf->frag_array[0];
+ pci_unmap_single(pdev, nf->dma, skb_headlen(skb), PCI_DMA_TODEVICE);
}
static inline void
@@ -2144,7 +2139,7 @@ qlcnic_xmit_frame(struct sk_buff *skb, struct net_device *netdev)
int i, k;
u32 producer;
- int frag_count, no_of_desc;
+ int frag_count;
u32 num_txd = tx_ring->num_desc;
if (!test_bit(__QLCNIC_DEV_UP, &adapter->state)) {
@@ -2161,12 +2156,8 @@ qlcnic_xmit_frame(struct sk_buff *skb, struct net_device *netdev)
frag_count = skb_shinfo(skb)->nr_frags + 1;
- /* 4 fragments per cmd des */
- no_of_desc = (frag_count + 3) >> 2;
-
if (unlikely(qlcnic_tx_avail(tx_ring) <= TX_STOP_THRESH)) {
netif_stop_queue(netdev);
- smp_mb();
if (qlcnic_tx_avail(tx_ring) > TX_STOP_THRESH)
netif_start_queue(netdev);
else {
@@ -2183,9 +2174,6 @@ qlcnic_xmit_frame(struct sk_buff *skb, struct net_device *netdev)
first_desc = hwdesc = &tx_ring->desc_head[producer];
qlcnic_clear_cmddesc((u64 *)hwdesc);
- if (qlcnic_check_tx_tagging(adapter, skb, first_desc))
- goto drop_packet;
-
if (qlcnic_map_tx_skb(pdev, skb, pbuf)) {
adapter->stats.tx_dma_map_error++;
goto drop_packet;
@@ -2229,8 +2217,10 @@ qlcnic_xmit_frame(struct sk_buff *skb, struct net_device *netdev)
}
tx_ring->producer = get_next_index(producer, num_txd);
+ smp_mb();
- qlcnic_tso_check(netdev, tx_ring, first_desc, skb);
+ if (unlikely(qlcnic_tx_pkt(adapter, first_desc, skb)))
+ goto unwind_buff;
if (qlcnic_mac_learn)
qlcnic_send_filter(adapter, tx_ring, first_desc, skb);
@@ -2242,6 +2232,8 @@ qlcnic_xmit_frame(struct sk_buff *skb, struct net_device *netdev)
return NETDEV_TX_OK;
+unwind_buff:
+ qlcnic_unmap_buffers(pdev, skb, pbuf);
drop_packet:
adapter->stats.txdropped++;
dev_kfree_skb_any(skb);
--
1.7.1
--
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