1 // SPDX-License-Identifier: GPL-2.0 or BSD-3-Clause
3  * Copyright(c) 2017 - 2018 Intel Corporation.
20  * struct vnic_txreq - VNIC transmit descriptor
42 	struct hfi1_vnic_sdma *vnic_sdma = tx->sdma;  in vnic_sdma_complete()
44 	sdma_txclean(vnic_sdma->dd, txreq);  in vnic_sdma_complete()
45 	dev_kfree_skb_any(tx->skb);  in vnic_sdma_complete()
46 	kmem_cache_free(vnic_sdma->dd->vnic.txreq_cache, tx);  in vnic_sdma_complete()
55 		sde->dd,  in build_vnic_ulp_payload()
56 		&tx->txreq,  in build_vnic_ulp_payload()
57 		tx->skb->data,  in build_vnic_ulp_payload()
58 		skb_headlen(tx->skb));  in build_vnic_ulp_payload()
62 	for (i = 0; i < skb_shinfo(tx->skb)->nr_frags; i++) {  in build_vnic_ulp_payload()
63 		skb_frag_t *frag = &skb_shinfo(tx->skb)->frags[i];  in build_vnic_ulp_payload()
66 		ret = sdma_txadd_page(sde->dd,  in build_vnic_ulp_payload()
67 				      &tx->txreq,  in build_vnic_ulp_payload()
75 	if (tx->plen)  in build_vnic_ulp_payload()
76 		ret = sdma_txadd_kvaddr(sde->dd, &tx->txreq,  in build_vnic_ulp_payload()
77 					tx->pad + HFI1_VNIC_MAX_PAD - tx->plen,  in build_vnic_ulp_payload()
78 					tx->plen);  in build_vnic_ulp_payload()
92 		&tx->txreq,  in build_vnic_tx_desc()
94 		hdrbytes + tx->skb->len + tx->plen,  in build_vnic_tx_desc()
104 	tx->pbc_val = cpu_to_le64(pbc);  in build_vnic_tx_desc()
106 		sde->dd,  in build_vnic_tx_desc()
107 		&tx->txreq,  in build_vnic_tx_desc()
108 		&tx->pbc_val,  in build_vnic_tx_desc()
122 	pad[HFI1_VNIC_MAX_PAD - 1] = plen - OPA_VNIC_ICRC_TAIL_LEN;  in hfi1_vnic_update_pad()
129 	struct hfi1_vnic_sdma *vnic_sdma = &vinfo->sdma[q_idx];  in hfi1_vnic_send_dma()
130 	struct sdma_engine *sde = vnic_sdma->sde;  in hfi1_vnic_send_dma()
132 	int ret = -ECOMM;  in hfi1_vnic_send_dma()
134 	if (unlikely(READ_ONCE(vnic_sdma->state) != HFI1_VNIC_SDMA_Q_ACTIVE))  in hfi1_vnic_send_dma()
140 	tx = kmem_cache_alloc(dd->vnic.txreq_cache, GFP_ATOMIC);  in hfi1_vnic_send_dma()
142 		ret = -ENOMEM;  in hfi1_vnic_send_dma()
146 	tx->sdma = vnic_sdma;  in hfi1_vnic_send_dma()
147 	tx->skb = skb;  in hfi1_vnic_send_dma()
148 	hfi1_vnic_update_pad(tx->pad, plen);  in hfi1_vnic_send_dma()
149 	tx->plen = plen;  in hfi1_vnic_send_dma()
154 	ret = sdma_send_txreq(sde, iowait_get_ib_work(&vnic_sdma->wait),  in hfi1_vnic_send_dma()
155 			      &tx->txreq, vnic_sdma->pkts_sent);  in hfi1_vnic_send_dma()
156 	/* When -ECOMM, sdma callback will be called with ABORT status */  in hfi1_vnic_send_dma()
157 	if (unlikely(ret && unlikely(ret != -ECOMM)))  in hfi1_vnic_send_dma()
161 		vnic_sdma->pkts_sent = true;  in hfi1_vnic_send_dma()
162 		iowait_starve_clear(vnic_sdma->pkts_sent, &vnic_sdma->wait);  in hfi1_vnic_send_dma()
167 	sdma_txclean(dd, &tx->txreq);  in hfi1_vnic_send_dma()
168 	kmem_cache_free(dd->vnic.txreq_cache, tx);  in hfi1_vnic_send_dma()
170 	if (ret != -EBUSY)  in hfi1_vnic_send_dma()
173 		vnic_sdma->pkts_sent = false;  in hfi1_vnic_send_dma()
178  * hfi1_vnic_sdma_sleep - vnic sdma sleep function
181  * sdma descriptors available to send the packet. It adds Tx queue's wait
186 				struct iowait_work *wait,  in hfi1_vnic_sdma_sleep()  argument
192 		container_of(wait->iow, struct hfi1_vnic_sdma, wait);  in hfi1_vnic_sdma_sleep()
194 	write_seqlock(&sde->waitlock);  in hfi1_vnic_sdma_sleep()
196 		write_sequnlock(&sde->waitlock);  in hfi1_vnic_sdma_sleep()
197 		return -EAGAIN;  in hfi1_vnic_sdma_sleep()
200 	vnic_sdma->state = HFI1_VNIC_SDMA_Q_DEFERRED;  in hfi1_vnic_sdma_sleep()
201 	if (list_empty(&vnic_sdma->wait.list)) {  in hfi1_vnic_sdma_sleep()
202 		iowait_get_priority(wait->iow);  in hfi1_vnic_sdma_sleep()
203 		iowait_queue(pkts_sent, wait->iow, &sde->dmawait);  in hfi1_vnic_sdma_sleep()
205 	write_sequnlock(&sde->waitlock);  in hfi1_vnic_sdma_sleep()
206 	return -EBUSY;  in hfi1_vnic_sdma_sleep()
210  * hfi1_vnic_sdma_wakeup - vnic sdma wakeup function
213  * queue's wait structure was previously added to sdma engine's dmawait list.
216 static void hfi1_vnic_sdma_wakeup(struct iowait *wait, int reason)  in hfi1_vnic_sdma_wakeup()  argument
219 		container_of(wait, struct hfi1_vnic_sdma, wait);  in hfi1_vnic_sdma_wakeup()
220 	struct hfi1_vnic_vport_info *vinfo = vnic_sdma->vinfo;  in hfi1_vnic_sdma_wakeup()
222 	vnic_sdma->state = HFI1_VNIC_SDMA_Q_ACTIVE;  in hfi1_vnic_sdma_wakeup()
223 	if (__netif_subqueue_stopped(vinfo->netdev, vnic_sdma->q_idx))  in hfi1_vnic_sdma_wakeup()
224 		netif_wake_subqueue(vinfo->netdev, vnic_sdma->q_idx);  in hfi1_vnic_sdma_wakeup()
230 	struct hfi1_vnic_sdma *vnic_sdma = &vinfo->sdma[q_idx];  in hfi1_vnic_sdma_write_avail()
232 	return (READ_ONCE(vnic_sdma->state) == HFI1_VNIC_SDMA_Q_ACTIVE);  in hfi1_vnic_sdma_write_avail()
239 	for (i = 0; i < vinfo->num_tx_q; i++) {  in hfi1_vnic_sdma_init()
240 		struct hfi1_vnic_sdma *vnic_sdma = &vinfo->sdma[i];  in hfi1_vnic_sdma_init()
242 		iowait_init(&vnic_sdma->wait, 0, NULL, NULL,  in hfi1_vnic_sdma_init()
245 		vnic_sdma->sde = &vinfo->dd->per_sdma[i];  in hfi1_vnic_sdma_init()
246 		vnic_sdma->dd = vinfo->dd;  in hfi1_vnic_sdma_init()
247 		vnic_sdma->vinfo = vinfo;  in hfi1_vnic_sdma_init()
248 		vnic_sdma->q_idx = i;  in hfi1_vnic_sdma_init()
249 		vnic_sdma->state = HFI1_VNIC_SDMA_Q_ACTIVE;  in hfi1_vnic_sdma_init()
252 		if (vnic_sdma->sde->descq_cnt > HFI1_VNIC_SDMA_DESC_WTRMRK) {  in hfi1_vnic_sdma_init()
255 			INIT_LIST_HEAD(&vnic_sdma->stx.list);  in hfi1_vnic_sdma_init()
256 			vnic_sdma->stx.num_desc = HFI1_VNIC_SDMA_DESC_WTRMRK;  in hfi1_vnic_sdma_init()
257 			work = iowait_get_ib_work(&vnic_sdma->wait);  in hfi1_vnic_sdma_init()
258 			list_add_tail(&vnic_sdma->stx.list, &work->tx_head);  in hfi1_vnic_sdma_init()
267 	snprintf(buf, sizeof(buf), "hfi1_%u_vnic_txreq_cache", dd->unit);  in hfi1_vnic_txreq_init()
268 	dd->vnic.txreq_cache = kmem_cache_create(buf,  in hfi1_vnic_txreq_init()
272 	if (!dd->vnic.txreq_cache)  in hfi1_vnic_txreq_init()
273 		return -ENOMEM;  in hfi1_vnic_txreq_init()
279 	kmem_cache_destroy(dd->vnic.txreq_cache);  in hfi1_vnic_txreq_deinit()
280 	dd->vnic.txreq_cache = NULL;  in hfi1_vnic_txreq_deinit()