cxgb3: Replace LRO with GRO

This patch makes cxgb3 invoke the GRO hooks instead of LRO.  As
GRO has a compatible external interface to LRO this is a very
straightforward replacement.

I've kept the ioctl controls for per-queue LRO switches.  However,
we should not encourage anyone to use these.

Because of that, I've also kept the skb construction code in
cxgb3.  Hopefully we can phase out those per-queue switches
and then kill this too.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Acked-by: Divy Le Ray <divy@chelsio.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 16 insertions, 103 deletions

diff --git a/drivers/net/cxgb3/sge.c b/drivers/net/cxgb3/sge.c
index 379a1324db4..8299fb538f2 100644
--- a/drivers/net/cxgb3/sge.c
+++ b/drivers/net/cxgb3/sge.c
@@ -585,8 +585,7 @@ static void t3_reset_qset(struct sge_qset *q)
 	memset(q->txq, 0, sizeof(struct sge_txq) * SGE_TXQ_PER_SET);
 	q->txq_stopped = 0;
 	q->tx_reclaim_timer.function = NULL; /* for t3_stop_sge_timers() */
-	kfree(q->lro_frag_tbl);
-	q->lro_nfrags = q->lro_frag_len = 0;
+	q->lro_frag_tbl.nr_frags = q->lro_frag_tbl.len = 0;
 }
 
 
@@ -1945,10 +1944,8 @@ static void rx_eth(struct adapter *adap, struct sge_rspq *rq,
 		qs->port_stats[SGE_PSTAT_VLANEX]++;
 		if (likely(grp))
 			if (lro)
-				lro_vlan_hwaccel_receive_skb(&qs->lro_mgr, skb,
-							     grp,
-							     ntohs(p->vlan),
-							     p);
+				vlan_gro_receive(&qs->napi, grp,
+						 ntohs(p->vlan), skb);
 			else {
 				if (unlikely(pi->iscsi_ipv4addr &&
 				    is_arp(skb))) {
@@ -1965,7 +1962,7 @@ static void rx_eth(struct adapter *adap, struct sge_rspq *rq,
 			dev_kfree_skb_any(skb);
 	} else if (rq->polling) {
 		if (lro)
-			lro_receive_skb(&qs->lro_mgr, skb, p);
+			napi_gro_receive(&qs->napi, skb);
 		else {
 			if (unlikely(pi->iscsi_ipv4addr && is_arp(skb)))
 				cxgb3_arp_process(adap, skb);
@@ -1981,59 +1978,6 @@ static inline int is_eth_tcp(u32 rss)
 }
 
 /**
- *	lro_frame_ok - check if an ingress packet is eligible for LRO
- *	@p: the CPL header of the packet
- *
- *	Returns true if a received packet is eligible for LRO.
- *	The following conditions must be true:
- *	- packet is TCP/IP Ethernet II (checked elsewhere)
- *	- not an IP fragment
- *	- no IP options
- *	- TCP/IP checksums are correct
- *	- the packet is for this host
- */
-static inline int lro_frame_ok(const struct cpl_rx_pkt *p)
-{
-	const struct ethhdr *eh = (struct ethhdr *)(p + 1);
-	const struct iphdr *ih = (struct iphdr *)(eh + 1);
-
-	return (*((u8 *)p + 1) & 0x90) == 0x10 && p->csum == htons(0xffff) &&
-		eh->h_proto == htons(ETH_P_IP) && ih->ihl == (sizeof(*ih) >> 2);
-}
-
-static int t3_get_lro_header(void **eh,  void **iph, void **tcph,
-			     u64 *hdr_flags, void *priv)
-{
-	const struct cpl_rx_pkt *cpl = priv;
-
-	if (!lro_frame_ok(cpl))
-		return -1;
-
-	*eh = (struct ethhdr *)(cpl + 1);
-	*iph = (struct iphdr *)((struct ethhdr *)*eh + 1);
-	*tcph = (struct tcphdr *)((struct iphdr *)*iph + 1);
-
-	*hdr_flags = LRO_IPV4 | LRO_TCP;
-	return 0;
-}
-
-static int t3_get_skb_header(struct sk_buff *skb,
-			      void **iph, void **tcph, u64 *hdr_flags,
-			      void *priv)
-{
-	void *eh;
-
-	return t3_get_lro_header(&eh, iph, tcph, hdr_flags, priv);
-}
-
-static int t3_get_frag_header(struct skb_frag_struct *frag, void **eh,
-			      void **iph, void **tcph, u64 *hdr_flags,
-			      void *priv)
-{
-	return t3_get_lro_header(eh, iph, tcph, hdr_flags, priv);
-}
-
-/**
  *	lro_add_page - add a page chunk to an LRO session
  *	@adap: the adapter
  *	@qs: the associated queue set
@@ -2049,8 +1993,9 @@ static void lro_add_page(struct adapter *adap, struct sge_qset *qs,
 {
 	struct rx_sw_desc *sd = &fl->sdesc[fl->cidx];
 	struct cpl_rx_pkt *cpl;
-	struct skb_frag_struct *rx_frag = qs->lro_frag_tbl;
-	int nr_frags = qs->lro_nfrags, frag_len = qs->lro_frag_len;
+	struct skb_frag_struct *rx_frag = qs->lro_frag_tbl.frags;
+	int nr_frags = qs->lro_frag_tbl.nr_frags;
+	int frag_len = qs->lro_frag_tbl.len;
 	int offset = 0;
 
 	if (!nr_frags) {
@@ -2069,13 +2014,13 @@ static void lro_add_page(struct adapter *adap, struct sge_qset *qs,
 	rx_frag->page_offset = sd->pg_chunk.offset + offset;
 	rx_frag->size = len;
 	frag_len += len;
-	qs->lro_nfrags++;
-	qs->lro_frag_len = frag_len;
+	qs->lro_frag_tbl.nr_frags++;
+	qs->lro_frag_tbl.len = frag_len;
 
 	if (!complete)
 		return;
 
-	qs->lro_nfrags = qs->lro_frag_len = 0;
+	qs->lro_frag_tbl.ip_summed = CHECKSUM_UNNECESSARY;
 	cpl = qs->lro_va;
 
 	if (unlikely(cpl->vlan_valid)) {
@@ -2084,36 +2029,15 @@ static void lro_add_page(struct adapter *adap, struct sge_qset *qs,
 		struct vlan_group *grp = pi->vlan_grp;
 
 		if (likely(grp != NULL)) {
-			lro_vlan_hwaccel_receive_frags(&qs->lro_mgr,
-						       qs->lro_frag_tbl,
-						       frag_len, frag_len,
-						       grp, ntohs(cpl->vlan),
-						       cpl, 0);
-			return;
+			vlan_gro_frags(&qs->napi, grp, ntohs(cpl->vlan),
+				       &qs->lro_frag_tbl);
+			goto out;
 		}
 	}
-	lro_receive_frags(&qs->lro_mgr, qs->lro_frag_tbl,
-			  frag_len, frag_len, cpl, 0);
-}
+	napi_gro_frags(&qs->napi, &qs->lro_frag_tbl);
 
-/**
- *	init_lro_mgr - initialize a LRO manager object
- *	@lro_mgr: the LRO manager object
- */
-static void init_lro_mgr(struct sge_qset *qs, struct net_lro_mgr *lro_mgr)
-{
-	lro_mgr->dev = qs->netdev;
-	lro_mgr->features = LRO_F_NAPI;
-	lro_mgr->frag_align_pad = NET_IP_ALIGN;
-	lro_mgr->ip_summed = CHECKSUM_UNNECESSARY;
-	lro_mgr->ip_summed_aggr = CHECKSUM_UNNECESSARY;
-	lro_mgr->max_desc = T3_MAX_LRO_SES;
-	lro_mgr->lro_arr = qs->lro_desc;
-	lro_mgr->get_frag_header = t3_get_frag_header;
-	lro_mgr->get_skb_header = t3_get_skb_header;
-	lro_mgr->max_aggr = T3_MAX_LRO_MAX_PKTS;
-	if (lro_mgr->max_aggr > MAX_SKB_FRAGS)
-		lro_mgr->max_aggr = MAX_SKB_FRAGS;
+out:
+	qs->lro_frag_tbl.nr_frags = qs->lro_frag_tbl.len = 0;
 }
 
 /**
@@ -2357,10 +2281,6 @@ next_fl:
 	}
 
 	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);
@@ -2907,7 +2827,6 @@ 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);
 	setup_timer(&q->tx_reclaim_timer, sge_timer_cb, (unsigned long)q);
@@ -2987,10 +2906,6 @@ 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 < */
@@ -3042,8 +2957,6 @@ int t3_sge_alloc_qset(struct adapter *adapter, unsigned int id, int nports,
 	q->tx_q = netdevq;
 	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) {