cxgb3 - Add LRO support
Add LRO support. Signed-off-by: Divy Le Ray <divy@chelsio.com> Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
This commit is contained in:
Divy Le Ray
Jeff Garzik
parent
7385ecf339
commit
b47385bd4f
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@ -2409,6 +2409,7 @@ config CHELSIO_T3
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tristate "Chelsio Communications T3 10Gb Ethernet support"
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depends on PCI
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select FW_LOADER
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select INET_LRO
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help
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This driver supports Chelsio T3-based gigabit and 10Gb Ethernet
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adapters.
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@ -42,6 +42,7 @@
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#include <linux/cache.h>
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#include <linux/mutex.h>
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#include <linux/bitops.h>
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#include <linux/inet_lro.h>
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#include "t3cdev.h"
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#include <asm/io.h>
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@ -173,16 +174,29 @@ enum { /* per port SGE statistics */
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SGE_PSTAT_TX_CSUM, /* # of TX checksum offloads */
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SGE_PSTAT_VLANEX, /* # of VLAN tag extractions */
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SGE_PSTAT_VLANINS, /* # of VLAN tag insertions */
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SGE_PSTAT_LRO_AGGR, /* # of page chunks added to LRO sessions */
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SGE_PSTAT_LRO_FLUSHED, /* # of flushed LRO sessions */
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SGE_PSTAT_LRO_NO_DESC, /* # of overflown LRO sessions */
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SGE_PSTAT_MAX /* must be last */
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};
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#define T3_MAX_LRO_SES 8
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#define T3_MAX_LRO_MAX_PKTS 64
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struct sge_qset { /* an SGE queue set */
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struct adapter *adap;
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struct napi_struct napi;
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struct sge_rspq rspq;
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struct sge_fl fl[SGE_RXQ_PER_SET];
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struct sge_txq txq[SGE_TXQ_PER_SET];
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struct net_lro_mgr lro_mgr;
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struct net_lro_desc lro_desc[T3_MAX_LRO_SES];
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struct skb_frag_struct *lro_frag_tbl;
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int lro_nfrags;
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int lro_enabled;
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int lro_frag_len;
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void *lro_va;
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struct net_device *netdev;
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unsigned long txq_stopped; /* which Tx queues are stopped */
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struct timer_list tx_reclaim_timer; /* reclaims TX buffers */
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@ -351,6 +351,7 @@ struct tp_params {
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struct qset_params { /* SGE queue set parameters */
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unsigned int polling; /* polling/interrupt service for rspq */
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unsigned int lro; /* large receive offload */
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unsigned int coalesce_usecs; /* irq coalescing timer */
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unsigned int rspq_size; /* # of entries in response queue */
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unsigned int fl_size; /* # of entries in regular free list */
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@ -90,6 +90,7 @@ struct ch_qset_params {
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int32_t fl_size[2];
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int32_t intr_lat;
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int32_t polling;
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int32_t lro;
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int32_t cong_thres;
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};
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@ -1212,6 +1212,9 @@ static char stats_strings[][ETH_GSTRING_LEN] = {
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"VLANinsertions ",
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"TxCsumOffload ",
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"RxCsumGood ",
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"LroAggregated ",
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"LroFlushed ",
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"LroNoDesc ",
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"RxDrops ",
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"CheckTXEnToggled ",
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@ -1340,6 +1343,9 @@ static void get_stats(struct net_device *dev, struct ethtool_stats *stats,
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*data++ = collect_sge_port_stats(adapter, pi, SGE_PSTAT_VLANINS);
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*data++ = collect_sge_port_stats(adapter, pi, SGE_PSTAT_TX_CSUM);
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*data++ = collect_sge_port_stats(adapter, pi, SGE_PSTAT_RX_CSUM_GOOD);
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*data++ = collect_sge_port_stats(adapter, pi, SGE_PSTAT_LRO_AGGR);
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*data++ = collect_sge_port_stats(adapter, pi, SGE_PSTAT_LRO_FLUSHED);
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*data++ = collect_sge_port_stats(adapter, pi, SGE_PSTAT_LRO_NO_DESC);
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*data++ = s->rx_cong_drops;
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*data++ = s->num_toggled;
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@ -1558,6 +1564,13 @@ static int set_rx_csum(struct net_device *dev, u32 data)
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struct port_info *p = netdev_priv(dev);
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p->rx_csum_offload = data;
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if (!data) {
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struct adapter *adap = p->adapter;
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int i;
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for (i = p->first_qset; i < p->first_qset + p->nqsets; i++)
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adap->sge.qs[i].lro_enabled = 0;
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}
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return 0;
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}
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@ -1830,6 +1843,11 @@ static int cxgb_extension_ioctl(struct net_device *dev, void __user *useraddr)
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}
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}
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}
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if (t.lro >= 0) {
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struct sge_qset *qs = &adapter->sge.qs[t.qset_idx];
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q->lro = t.lro;
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qs->lro_enabled = t.lro;
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}
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break;
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}
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case CHELSIO_GET_QSET_PARAMS:{
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@ -1849,6 +1867,7 @@ static int cxgb_extension_ioctl(struct net_device *dev, void __user *useraddr)
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t.fl_size[0] = q->fl_size;
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t.fl_size[1] = q->jumbo_size;
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t.polling = q->polling;
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t.lro = q->lro;
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t.intr_lat = q->coalesce_usecs;
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t.cong_thres = q->cong_thres;
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@ -584,6 +584,8 @@ static void t3_reset_qset(struct sge_qset *q)
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memset(q->txq, 0, sizeof(struct sge_txq) * SGE_TXQ_PER_SET);
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q->txq_stopped = 0;
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memset(&q->tx_reclaim_timer, 0, sizeof(q->tx_reclaim_timer));
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kfree(q->lro_frag_tbl);
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q->lro_nfrags = q->lro_frag_len = 0;
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}
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@ -796,7 +798,7 @@ recycle:
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goto recycle;
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if (!skb)
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newskb = alloc_skb(SGE_RX_PULL_LEN, GFP_ATOMIC);
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newskb = alloc_skb(SGE_RX_PULL_LEN, GFP_ATOMIC);
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if (unlikely(!newskb)) {
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if (!drop_thres)
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return NULL;
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@ -1868,9 +1870,10 @@ static void restart_tx(struct sge_qset *qs)
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* if it was immediate data in a response.
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*/
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static void rx_eth(struct adapter *adap, struct sge_rspq *rq,
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struct sk_buff *skb, int pad)
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struct sk_buff *skb, int pad, int lro)
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{
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struct cpl_rx_pkt *p = (struct cpl_rx_pkt *)(skb->data + pad);
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struct sge_qset *qs = rspq_to_qset(rq);
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struct port_info *pi;
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skb_pull(skb, sizeof(*p) + pad);
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@ -1887,18 +1890,202 @@ static void rx_eth(struct adapter *adap, struct sge_rspq *rq,
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if (unlikely(p->vlan_valid)) {
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struct vlan_group *grp = pi->vlan_grp;
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rspq_to_qset(rq)->port_stats[SGE_PSTAT_VLANEX]++;
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qs->port_stats[SGE_PSTAT_VLANEX]++;
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if (likely(grp))
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__vlan_hwaccel_rx(skb, grp, ntohs(p->vlan),
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rq->polling);
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if (lro)
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lro_vlan_hwaccel_receive_skb(&qs->lro_mgr, skb,
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grp,
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ntohs(p->vlan),
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p);
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else
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__vlan_hwaccel_rx(skb, grp, ntohs(p->vlan),
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rq->polling);
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else
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dev_kfree_skb_any(skb);
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} else if (rq->polling)
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netif_receive_skb(skb);
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else
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} else if (rq->polling) {
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if (lro)
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lro_receive_skb(&qs->lro_mgr, skb, p);
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else
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netif_receive_skb(skb);
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} else
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netif_rx(skb);
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}
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static inline int is_eth_tcp(u32 rss)
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{
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return G_HASHTYPE(ntohl(rss)) == RSS_HASH_4_TUPLE;
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}
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/**
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* lro_frame_ok - check if an ingress packet is eligible for LRO
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* @p: the CPL header of the packet
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*
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* Returns true if a received packet is eligible for LRO.
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* The following conditions must be true:
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* - packet is TCP/IP Ethernet II (checked elsewhere)
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* - not an IP fragment
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* - no IP options
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* - TCP/IP checksums are correct
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* - the packet is for this host
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*/
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static inline int lro_frame_ok(const struct cpl_rx_pkt *p)
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{
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const struct ethhdr *eh = (struct ethhdr *)(p + 1);
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const struct iphdr *ih = (struct iphdr *)(eh + 1);
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return (*((u8 *)p + 1) & 0x90) == 0x10 && p->csum == htons(0xffff) &&
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eh->h_proto == htons(ETH_P_IP) && ih->ihl == (sizeof(*ih) >> 2);
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}
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#define TCP_FLAG_MASK (TCP_FLAG_CWR | TCP_FLAG_ECE | TCP_FLAG_URG |\
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TCP_FLAG_ACK | TCP_FLAG_PSH | TCP_FLAG_RST |\
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TCP_FLAG_SYN | TCP_FLAG_FIN)
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#define TSTAMP_WORD ((TCPOPT_NOP << 24) | (TCPOPT_NOP << 16) |\
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(TCPOPT_TIMESTAMP << 8) | TCPOLEN_TIMESTAMP)
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/**
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* lro_segment_ok - check if a TCP segment is eligible for LRO
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* @tcph: the TCP header of the packet
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*
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* Returns true if a TCP packet is eligible for LRO. This requires that
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* the packet have only the ACK flag set and no TCP options besides
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* time stamps.
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*/
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static inline int lro_segment_ok(const struct tcphdr *tcph)
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{
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int optlen;
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if (unlikely((tcp_flag_word(tcph) & TCP_FLAG_MASK) != TCP_FLAG_ACK))
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return 0;
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optlen = (tcph->doff << 2) - sizeof(*tcph);
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if (optlen) {
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const u32 *opt = (const u32 *)(tcph + 1);
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if (optlen != TCPOLEN_TSTAMP_ALIGNED ||
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*opt != htonl(TSTAMP_WORD) || !opt[2])
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return 0;
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}
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return 1;
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}
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static int t3_get_lro_header(void **eh, void **iph, void **tcph,
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u64 *hdr_flags, void *priv)
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{
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const struct cpl_rx_pkt *cpl = priv;
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if (!lro_frame_ok(cpl))
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return -1;
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*eh = (struct ethhdr *)(cpl + 1);
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*iph = (struct iphdr *)((struct ethhdr *)*eh + 1);
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*tcph = (struct tcphdr *)((struct iphdr *)*iph + 1);
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if (!lro_segment_ok(*tcph))
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return -1;
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*hdr_flags = LRO_IPV4 | LRO_TCP;
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return 0;
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}
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static int t3_get_skb_header(struct sk_buff *skb,
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void **iph, void **tcph, u64 *hdr_flags,
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void *priv)
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{
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void *eh;
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return t3_get_lro_header(&eh, iph, tcph, hdr_flags, priv);
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}
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static int t3_get_frag_header(struct skb_frag_struct *frag, void **eh,
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void **iph, void **tcph, u64 *hdr_flags,
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void *priv)
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{
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return t3_get_lro_header(eh, iph, tcph, hdr_flags, priv);
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}
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/**
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* lro_add_page - add a page chunk to an LRO session
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* @adap: the adapter
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* @qs: the associated queue set
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* @fl: the free list containing the page chunk to add
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* @len: packet length
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* @complete: Indicates the last fragment of a frame
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*
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* Add a received packet contained in a page chunk to an existing LRO
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* session.
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*/
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static void lro_add_page(struct adapter *adap, struct sge_qset *qs,
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struct sge_fl *fl, int len, int complete)
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{
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struct rx_sw_desc *sd = &fl->sdesc[fl->cidx];
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struct cpl_rx_pkt *cpl;
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struct skb_frag_struct *rx_frag = qs->lro_frag_tbl;
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int nr_frags = qs->lro_nfrags, frag_len = qs->lro_frag_len;
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int offset = 0;
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if (!nr_frags) {
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offset = 2 + sizeof(struct cpl_rx_pkt);
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qs->lro_va = cpl = sd->pg_chunk.va + 2;
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}
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fl->credits--;
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len -= offset;
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pci_unmap_single(adap->pdev, pci_unmap_addr(sd, dma_addr),
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fl->buf_size, PCI_DMA_FROMDEVICE);
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rx_frag += nr_frags;
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rx_frag->page = sd->pg_chunk.page;
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rx_frag->page_offset = sd->pg_chunk.offset + offset;
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rx_frag->size = len;
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frag_len += len;
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qs->lro_nfrags++;
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qs->lro_frag_len = frag_len;
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if (!complete)
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return;
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qs->lro_nfrags = qs->lro_frag_len = 0;
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cpl = qs->lro_va;
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if (unlikely(cpl->vlan_valid)) {
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struct net_device *dev = qs->netdev;
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struct port_info *pi = netdev_priv(dev);
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struct vlan_group *grp = pi->vlan_grp;
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if (likely(grp != NULL)) {
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lro_vlan_hwaccel_receive_frags(&qs->lro_mgr,
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qs->lro_frag_tbl,
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frag_len, frag_len,
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grp, ntohs(cpl->vlan),
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cpl, 0);
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return;
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}
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}
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lro_receive_frags(&qs->lro_mgr, qs->lro_frag_tbl,
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frag_len, frag_len, cpl, 0);
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}
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/**
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* init_lro_mgr - initialize a LRO manager object
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* @lro_mgr: the LRO manager object
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*/
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static void init_lro_mgr(struct sge_qset *qs, struct net_lro_mgr *lro_mgr)
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{
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lro_mgr->dev = qs->netdev;
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lro_mgr->features = LRO_F_NAPI;
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lro_mgr->ip_summed = CHECKSUM_UNNECESSARY;
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lro_mgr->ip_summed_aggr = CHECKSUM_UNNECESSARY;
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lro_mgr->max_desc = T3_MAX_LRO_SES;
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lro_mgr->lro_arr = qs->lro_desc;
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lro_mgr->get_frag_header = t3_get_frag_header;
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lro_mgr->get_skb_header = t3_get_skb_header;
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lro_mgr->max_aggr = T3_MAX_LRO_MAX_PKTS;
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if (lro_mgr->max_aggr > MAX_SKB_FRAGS)
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lro_mgr->max_aggr = MAX_SKB_FRAGS;
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}
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/**
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* handle_rsp_cntrl_info - handles control information in a response
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* @qs: the queue set corresponding to the response
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@ -2027,7 +2214,7 @@ static int process_responses(struct adapter *adap, struct sge_qset *qs,
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q->next_holdoff = q->holdoff_tmr;
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while (likely(budget_left && is_new_response(r, q))) {
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int packet_complete, eth, ethpad = 2;
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int packet_complete, eth, ethpad = 2, lro = qs->lro_enabled;
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struct sk_buff *skb = NULL;
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u32 len, flags = ntohl(r->flags);
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__be32 rss_hi = *(const __be32 *)r,
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@ -2059,6 +2246,9 @@ no_mem:
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} else if ((len = ntohl(r->len_cq)) != 0) {
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struct sge_fl *fl;
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if (eth)
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lro = qs->lro_enabled && is_eth_tcp(rss_hi);
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fl = (len & F_RSPD_FLQ) ? &qs->fl[1] : &qs->fl[0];
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if (fl->use_pages) {
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void *addr = fl->sdesc[fl->cidx].pg_chunk.va;
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@ -2068,6 +2258,12 @@ no_mem:
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prefetch(addr + L1_CACHE_BYTES);
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#endif
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__refill_fl(adap, fl);
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if (lro > 0) {
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lro_add_page(adap, qs, fl,
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G_RSPD_LEN(len),
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flags & F_RSPD_EOP);
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goto next_fl;
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}
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skb = get_packet_pg(adap, fl, q,
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G_RSPD_LEN(len),
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@ -2083,7 +2279,7 @@ no_mem:
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q->rx_drops++;
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} else if (unlikely(r->rss_hdr.opcode == CPL_TRACE_PKT))
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__skb_pull(skb, 2);
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next_fl:
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if (++fl->cidx == fl->size)
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fl->cidx = 0;
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} else
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@ -2113,7 +2309,7 @@ no_mem:
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if (skb != NULL && packet_complete) {
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if (eth)
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rx_eth(adap, q, skb, ethpad);
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rx_eth(adap, q, skb, ethpad, lro);
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else {
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q->offload_pkts++;
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/* Preserve the RSS info in csum & priority */
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|
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@ -2125,12 +2321,17 @@ no_mem:
|
|||
}
|
||||
|
||||
if (flags & F_RSPD_EOP)
|
||||
clear_rspq_bufstate(q);
|
||||
clear_rspq_bufstate(q);
|
||||
}
|
||||
--budget_left;
|
||||
}
|
||||
|
||||
deliver_partial_bundle(&adap->tdev, q, offload_skbs, ngathered);
|
||||
lro_flush_all(&qs->lro_mgr);
|
||||
qs->port_stats[SGE_PSTAT_LRO_AGGR] = qs->lro_mgr.stats.aggregated;
|
||||
qs->port_stats[SGE_PSTAT_LRO_FLUSHED] = qs->lro_mgr.stats.flushed;
|
||||
qs->port_stats[SGE_PSTAT_LRO_NO_DESC] = qs->lro_mgr.stats.no_desc;
|
||||
|
||||
if (sleeping)
|
||||
check_ring_db(adap, qs, sleeping);
|
||||
|
||||
|
|
@ -2674,6 +2875,7 @@ int t3_sge_alloc_qset(struct adapter *adapter, unsigned int id, int nports,
|
|||
{
|
||||
int i, avail, ret = -ENOMEM;
|
||||
struct sge_qset *q = &adapter->sge.qs[id];
|
||||
struct net_lro_mgr *lro_mgr = &q->lro_mgr;
|
||||
|
||||
init_qset_cntxt(q, id);
|
||||
init_timer(&q->tx_reclaim_timer);
|
||||
|
|
@ -2754,6 +2956,10 @@ int t3_sge_alloc_qset(struct adapter *adapter, unsigned int id, int nports,
|
|||
q->fl[0].order = FL0_PG_ORDER;
|
||||
q->fl[1].order = FL1_PG_ORDER;
|
||||
|
||||
q->lro_frag_tbl = kcalloc(MAX_FRAME_SIZE / FL1_PG_CHUNK_SIZE + 1,
|
||||
sizeof(struct skb_frag_struct),
|
||||
GFP_KERNEL);
|
||||
q->lro_nfrags = q->lro_frag_len = 0;
|
||||
spin_lock_irq(&adapter->sge.reg_lock);
|
||||
|
||||
/* FL threshold comparison uses < */
|
||||
|
|
@ -2803,6 +3009,9 @@ int t3_sge_alloc_qset(struct adapter *adapter, unsigned int id, int nports,
|
|||
q->adap = adapter;
|
||||
q->netdev = dev;
|
||||
t3_update_qset_coalesce(q, p);
|
||||
|
||||
init_lro_mgr(q, lro_mgr);
|
||||
|
||||
avail = refill_fl(adapter, &q->fl[0], q->fl[0].size,
|
||||
GFP_KERNEL | __GFP_COMP);
|
||||
if (!avail) {
|
||||
|
|
|
|||
|
|
@ -174,6 +174,13 @@ enum { /* TCP congestion control algorithms */
|
|||
CONG_ALG_HIGHSPEED
|
||||
};
|
||||
|
||||
enum { /* RSS hash type */
|
||||
RSS_HASH_NONE = 0,
|
||||
RSS_HASH_2_TUPLE = 1,
|
||||
RSS_HASH_4_TUPLE = 2,
|
||||
RSS_HASH_TCPV6 = 3
|
||||
};
|
||||
|
||||
union opcode_tid {
|
||||
__be32 opcode_tid;
|
||||
__u8 opcode;
|
||||
|
|
@ -184,6 +191,10 @@ union opcode_tid {
|
|||
#define G_OPCODE(x) (((x) >> S_OPCODE) & 0xFF)
|
||||
#define G_TID(x) ((x) & 0xFFFFFF)
|
||||
|
||||
#define S_HASHTYPE 22
|
||||
#define M_HASHTYPE 0x3
|
||||
#define G_HASHTYPE(x) (((x) >> S_HASHTYPE) & M_HASHTYPE)
|
||||
|
||||
/* tid is assumed to be 24-bits */
|
||||
#define MK_OPCODE_TID(opcode, tid) (V_OPCODE(opcode) | (tid))
|
||||
|
||||
|
|
|
|||
Loading…
Reference in New Issue