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Commit 2e51e45c authored by Potnuri Bharat Teja's avatar Potnuri Bharat Teja Committed by Jason Gunthorpe
Browse files

iw_cxgb4: pass window scale in flowc work request 



This will allow FW to not send more data to TP (which would then need to
be buffered). Pass the negotiated TCP window scale to FW in the FLOWC WR.

Also refactor send_flowc() a bit to clean it up.

Signed-off-by: default avatarSteve Wise <swise@opengridcomputing.com>
Signed-off-by: default avatarPotnuri Bharat Teja <bharat@chelsio.com>
Signed-off-by: default avatarJason Gunthorpe <jgg@mellanox.com>
parent 0dfe4522

drivers/infiniband/hw/cxgb4/cm.c

+23 −23
Original line number Diff line number Diff line
@@ -587,24 +587,29 @@ static int send_flowc(struct c4iw_ep *ep) 
{

	struct fw_flowc_wr *flowc;

	struct sk_buff *skb = skb_dequeue(&ep->com.ep_skb_list);

	int i;

	u16 vlan = ep->l2t->vlan;

	int nparams;

	int flowclen, flowclen16;



	if (WARN_ON(!skb))

		return -ENOMEM;



	if (vlan == CPL_L2T_VLAN_NONE)

		nparams = 8;

	else

		nparams = 9;

	else

		nparams = 10;



	flowclen = offsetof(struct fw_flowc_wr, mnemval[nparams]);

	flowclen16 = DIV_ROUND_UP(flowclen, 16);

	flowclen = flowclen16 * 16;



	flowc = __skb_put(skb, FLOWC_LEN);

	flowc = __skb_put(skb, flowclen);

	memset(flowc, 0, flowclen);



	flowc->op_to_nparams = cpu_to_be32(FW_WR_OP_V(FW_FLOWC_WR) |

					   FW_FLOWC_WR_NPARAMS_V(nparams));

	flowc->flowid_len16 = cpu_to_be32(FW_WR_LEN16_V(DIV_ROUND_UP(FLOWC_LEN,

					  16)) | FW_WR_FLOWID_V(ep->hwtid));

	flowc->flowid_len16 = cpu_to_be32(FW_WR_LEN16_V(flowclen16) |

					  FW_WR_FLOWID_V(ep->hwtid));



	flowc->mnemval[0].mnemonic = FW_FLOWC_MNEM_PFNVFN;

	flowc->mnemval[0].val = cpu_to_be32(FW_PFVF_CMD_PFN_V
@@ -623,21 +628,13 @@ static int send_flowc(struct c4iw_ep *ep) 
	flowc->mnemval[6].val = cpu_to_be32(ep->snd_win);

	flowc->mnemval[7].mnemonic = FW_FLOWC_MNEM_MSS;

	flowc->mnemval[7].val = cpu_to_be32(ep->emss);

	if (nparams == 9) {

	flowc->mnemval[8].mnemonic = FW_FLOWC_MNEM_RCV_SCALE;

	flowc->mnemval[8].val = cpu_to_be32(ep->snd_wscale);

	if (nparams == 10) {

		u16 pri;



		pri = (vlan & VLAN_PRIO_MASK) >> VLAN_PRIO_SHIFT;

		flowc->mnemval[8].mnemonic = FW_FLOWC_MNEM_SCHEDCLASS;

		flowc->mnemval[8].val = cpu_to_be32(pri);

	} else {

		/* Pad WR to 16 byte boundary */

		flowc->mnemval[8].mnemonic = 0;

		flowc->mnemval[8].val = 0;

	}

	for (i = 0; i < 9; i++) {

		flowc->mnemval[i].r4[0] = 0;

		flowc->mnemval[i].r4[1] = 0;

		flowc->mnemval[i].r4[2] = 0;

		flowc->mnemval[9].mnemonic = FW_FLOWC_MNEM_SCHEDCLASS;

		flowc->mnemval[9].val = cpu_to_be32(pri);

	}



	set_wr_txq(skb, CPL_PRIORITY_DATA, ep->txq_idx);
@@ -1176,6 +1173,7 @@ static int act_establish(struct c4iw_dev *dev, struct sk_buff *skb) 
{

	struct c4iw_ep *ep;

	struct cpl_act_establish *req = cplhdr(skb);

	unsigned short tcp_opt = ntohs(req->tcp_opt);

	unsigned int tid = GET_TID(req);

	unsigned int atid = TID_TID_G(ntohl(req->tos_atid));

	struct tid_info *t = dev->rdev.lldi.tids;
@@ -1196,8 +1194,9 @@ static int act_establish(struct c4iw_dev *dev, struct sk_buff *skb) 


	ep->snd_seq = be32_to_cpu(req->snd_isn);

	ep->rcv_seq = be32_to_cpu(req->rcv_isn);

	ep->snd_wscale = TCPOPT_SND_WSCALE_G(tcp_opt);



	set_emss(ep, ntohs(req->tcp_opt));

	set_emss(ep, tcp_opt);



	/* dealloc the atid */

	remove_handle(ep->com.dev, &ep->com.dev->atid_idr, atid);
@@ -2629,16 +2628,17 @@ static int pass_establish(struct c4iw_dev *dev, struct sk_buff *skb) 
	struct cpl_pass_establish *req = cplhdr(skb);

	unsigned int tid = GET_TID(req);

	int ret;

	u16 tcp_opt = ntohs(req->tcp_opt);



	ep = get_ep_from_tid(dev, tid);

	pr_debug("ep %p tid %u\n", ep, ep->hwtid);

	ep->snd_seq = be32_to_cpu(req->snd_isn);

	ep->rcv_seq = be32_to_cpu(req->rcv_isn);

	ep->snd_wscale = TCPOPT_SND_WSCALE_G(tcp_opt);



	pr_debug("ep %p hwtid %u tcp_opt 0x%02x\n", ep, tid,

		 ntohs(req->tcp_opt));

	pr_debug("ep %p hwtid %u tcp_opt 0x%02x\n", ep, tid, tcp_opt);



	set_emss(ep, ntohs(req->tcp_opt));

	set_emss(ep, tcp_opt);



	dst_confirm(ep->dst);

	mutex_lock(&ep->com.mutex);

drivers/infiniband/hw/cxgb4/iw_cxgb4.h

+5 −1
Original line number Diff line number Diff line
@@ -910,7 +910,10 @@ enum conn_pre_alloc_buffers { 
	CN_MAX_CON_BUF

};



#define FLOWC_LEN 80

enum {

	FLOWC_LEN = offsetof(struct fw_flowc_wr, mnemval[FW_FLOWC_MNEM_MAX])

};



union cpl_wr_size {

	struct cpl_abort_req abrt_req;

	struct cpl_abort_rpl abrt_rpl;
@@ -977,6 +980,7 @@ struct c4iw_ep { 
	unsigned int retry_count;

	int snd_win;

	int rcv_win;

	u32 snd_wscale;

	struct c4iw_ep_stats stats;

};