i40iw: add puda code

i40iw_puda.[ch] are files to handle iwarp connection packets as
well as exception packets over multiple privilege mode uda queues.
Acked-by: Anjali Singhai Jain <anjali.singhai@intel.com>
Acked-by: Shannon Nelson <shannon.nelson@intel.com>
Signed-off-by: Faisal Latif <faisal.latif@intel.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>

drivers/infiniband/hw/i40iw/i40iw_puda.c

+/*******************************************************************************
+*
+* Copyright (c) 2015-2016 Intel Corporation.  All rights reserved.
+*
+* This software is available to you under a choice of one of two
+* licenses.  You may choose to be licensed under the terms of the GNU
+* General Public License (GPL) Version 2, available from the file
+* COPYING in the main directory of this source tree, or the
+* OpenFabrics.org BSD license below:
+*
+*   Redistribution and use in source and binary forms, with or
+*   without modification, are permitted provided that the following
+*   conditions are met:
+*
+*    - Redistributions of source code must retain the above
+*	copyright notice, this list of conditions and the following
+*	disclaimer.
+*
+*    - Redistributions in binary form must reproduce the above
+*	copyright notice, this list of conditions and the following
+*	disclaimer in the documentation and/or other materials
+*	provided with the distribution.
+*
+* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+* SOFTWARE.
+*
+*******************************************************************************/
+
+#include "i40iw_osdep.h"
+#include "i40iw_register.h"
+#include "i40iw_status.h"
+#include "i40iw_hmc.h"
+
+#include "i40iw_d.h"
+#include "i40iw_type.h"
+#include "i40iw_p.h"
+#include "i40iw_puda.h"
+
+static void i40iw_ieq_receive(struct i40iw_sc_dev *dev,
+			      struct i40iw_puda_buf *buf);
+static void i40iw_ieq_tx_compl(struct i40iw_sc_dev *dev, void *sqwrid);
+static void i40iw_ilq_putback_rcvbuf(struct i40iw_sc_qp *qp, u32 wqe_idx);
+static enum i40iw_status_code i40iw_puda_replenish_rq(struct i40iw_puda_rsrc
+						      *rsrc, bool initial);
+/**
+ * i40iw_puda_get_listbuf - get buffer from puda list
+ * @list: list to use for buffers (ILQ or IEQ)
+ */
+static struct i40iw_puda_buf *i40iw_puda_get_listbuf(struct list_head *list)
+{
+	struct i40iw_puda_buf *buf = NULL;
+
+	if (!list_empty(list)) {
+		buf = (struct i40iw_puda_buf *)list->next;
+		list_del((struct list_head *)&buf->list);
+	}
+	return buf;
+}
+
+/**
+ * i40iw_puda_get_bufpool - return buffer from resource
+ * @rsrc: resource to use for buffer
+ */
+struct i40iw_puda_buf *i40iw_puda_get_bufpool(struct i40iw_puda_rsrc *rsrc)
+{
+	struct i40iw_puda_buf *buf = NULL;
+	struct list_head *list = &rsrc->bufpool;
+	unsigned long	flags;
+
+	spin_lock_irqsave(&rsrc->bufpool_lock, flags);
+	buf = i40iw_puda_get_listbuf(list);
+	if (buf)
+		rsrc->avail_buf_count--;
+	else
+		rsrc->stats_buf_alloc_fail++;
+	spin_unlock_irqrestore(&rsrc->bufpool_lock, flags);
+	return buf;
+}
+
+/**
+ * i40iw_puda_ret_bufpool - return buffer to rsrc list
+ * @rsrc: resource to use for buffer
+ * @buf: buffe to return to resouce
+ */
+void i40iw_puda_ret_bufpool(struct i40iw_puda_rsrc *rsrc,
+			    struct i40iw_puda_buf *buf)
+{
+	unsigned long	flags;
+
+	spin_lock_irqsave(&rsrc->bufpool_lock, flags);
+	list_add(&buf->list, &rsrc->bufpool);
+	spin_unlock_irqrestore(&rsrc->bufpool_lock, flags);
+	rsrc->avail_buf_count++;
+}
+
+/**
+ * i40iw_puda_post_recvbuf - set wqe for rcv buffer
+ * @rsrc: resource ptr
+ * @wqe_idx: wqe index to use
+ * @buf: puda buffer for rcv q
+ * @initial: flag if during init time
+ */
+static void i40iw_puda_post_recvbuf(struct i40iw_puda_rsrc *rsrc, u32 wqe_idx,
+				    struct i40iw_puda_buf *buf, bool initial)
+{
+	u64 *wqe;
+	struct i40iw_sc_qp *qp = &rsrc->qp;
+	u64 offset24 = 0;
+
+	qp->qp_uk.rq_wrid_array[wqe_idx] = (uintptr_t)buf;
+	wqe = qp->qp_uk.rq_base[wqe_idx].elem;
+	i40iw_debug(rsrc->dev, I40IW_DEBUG_PUDA,
+		    "%s: wqe_idx= %d buf = %p wqe = %p\n", __func__,
+		    wqe_idx, buf, wqe);
+	if (!initial)
+		get_64bit_val(wqe, 24, &offset24);
+
+	offset24 = (offset24) ? 0 : LS_64(1, I40IWQPSQ_VALID);
+	set_64bit_val(wqe, 24, offset24);
+
+	set_64bit_val(wqe, 0, buf->mem.pa);
+	set_64bit_val(wqe, 8,
+		      LS_64(buf->mem.size, I40IWQPSQ_FRAG_LEN));
+	set_64bit_val(wqe, 24, offset24);
+}
+
+/**
+ * i40iw_puda_replenish_rq - post rcv buffers
+ * @rsrc: resource to use for buffer
+ * @initial: flag if during init time
+ */
+static enum i40iw_status_code i40iw_puda_replenish_rq(struct i40iw_puda_rsrc *rsrc,
+						      bool initial)
+{
+	u32 i;
+	u32 invalid_cnt = rsrc->rxq_invalid_cnt;
+	struct i40iw_puda_buf *buf = NULL;
+
+	for (i = 0; i < invalid_cnt; i++) {
+		buf = i40iw_puda_get_bufpool(rsrc);
+		if (!buf)
+			return I40IW_ERR_list_empty;
+		i40iw_puda_post_recvbuf(rsrc, rsrc->rx_wqe_idx, buf,
+					initial);
+		rsrc->rx_wqe_idx =
+		    ((rsrc->rx_wqe_idx + 1) % rsrc->rq_size);
+		rsrc->rxq_invalid_cnt--;
+	}
+	return 0;
+}
+
+/**
+ * i40iw_puda_alloc_buf - allocate mem for buffer
+ * @dev: iwarp device
+ * @length: length of buffer
+ */
+static struct i40iw_puda_buf *i40iw_puda_alloc_buf(struct i40iw_sc_dev *dev,
+						   u32 length)
+{
+	struct i40iw_puda_buf *buf = NULL;
+	struct i40iw_virt_mem buf_mem;
+	enum i40iw_status_code ret;
+
+	ret = i40iw_allocate_virt_mem(dev->hw, &buf_mem,
+				      sizeof(struct i40iw_puda_buf));
+	if (ret) {
+		i40iw_debug(dev, I40IW_DEBUG_PUDA,
+			    "%s: error mem for buf\n", __func__);
+		return NULL;
+	}
+	buf = (struct i40iw_puda_buf *)buf_mem.va;
+	ret = i40iw_allocate_dma_mem(dev->hw, &buf->mem, length, 1);
+	if (ret) {
+		i40iw_debug(dev, I40IW_DEBUG_PUDA,
+			    "%s: error dma mem for buf\n", __func__);
+		i40iw_free_virt_mem(dev->hw, &buf_mem);
+		return NULL;
+	}
+	buf->buf_mem.va = buf_mem.va;
+	buf->buf_mem.size = buf_mem.size;
+	return buf;
+}
+
+/**
+ * i40iw_puda_dele_buf - delete buffer back to system
+ * @dev: iwarp device
+ * @buf: buffer to free
+ */
+static void i40iw_puda_dele_buf(struct i40iw_sc_dev *dev,
+				struct i40iw_puda_buf *buf)
+{
+	i40iw_free_dma_mem(dev->hw, &buf->mem);
+	i40iw_free_virt_mem(dev->hw, &buf->buf_mem);
+}
+
+/**
+ * i40iw_puda_get_next_send_wqe - return next wqe for processing
+ * @qp: puda qp for wqe
+ * @wqe_idx: wqe index for caller
+ */
+static u64 *i40iw_puda_get_next_send_wqe(struct i40iw_qp_uk *qp, u32 *wqe_idx)
+{
+	u64 *wqe = NULL;
+	enum i40iw_status_code ret_code = 0;
+
+	*wqe_idx = I40IW_RING_GETCURRENT_HEAD(qp->sq_ring);
+	if (!*wqe_idx)
+		qp->swqe_polarity = !qp->swqe_polarity;
+	I40IW_RING_MOVE_HEAD(qp->sq_ring, ret_code);
+	if (ret_code)
+		return wqe;
+	wqe = qp->sq_base[*wqe_idx].elem;
+
+	return wqe;
+}
+
+/**
+ * i40iw_puda_poll_info - poll cq for completion
+ * @cq: cq for poll
+ * @info: info return for successful completion
+ */
+static enum i40iw_status_code i40iw_puda_poll_info(struct i40iw_sc_cq *cq,
+						   struct i40iw_puda_completion_info *info)
+{
+	u64 qword0, qword2, qword3;
+	u64 *cqe;
+	u64 comp_ctx;
+	bool valid_bit;
+	u32 major_err, minor_err;
+	bool error;
+
+	cqe = (u64 *)I40IW_GET_CURRENT_CQ_ELEMENT(&cq->cq_uk);
+	get_64bit_val(cqe, 24, &qword3);
+	valid_bit = (bool)RS_64(qword3, I40IW_CQ_VALID);
+
+	if (valid_bit != cq->cq_uk.polarity)
+		return I40IW_ERR_QUEUE_EMPTY;
+
+	i40iw_debug_buf(cq->dev, I40IW_DEBUG_PUDA, "PUDA CQE", cqe, 32);
+	error = (bool)RS_64(qword3, I40IW_CQ_ERROR);
+	if (error) {
+		i40iw_debug(cq->dev, I40IW_DEBUG_PUDA, "%s receive error\n", __func__);
+		major_err = (u32)(RS_64(qword3, I40IW_CQ_MAJERR));
+		minor_err = (u32)(RS_64(qword3, I40IW_CQ_MINERR));
+		info->compl_error = major_err << 16 | minor_err;
+		return I40IW_ERR_CQ_COMPL_ERROR;
+	}
+
+	get_64bit_val(cqe, 0, &qword0);
+	get_64bit_val(cqe, 16, &qword2);
+
+	info->q_type = (u8)RS_64(qword3, I40IW_CQ_SQ);
+	info->qp_id = (u32)RS_64(qword2, I40IWCQ_QPID);
+
+	get_64bit_val(cqe, 8, &comp_ctx);
+	info->qp = (struct i40iw_qp_uk *)(unsigned long)comp_ctx;
+	info->wqe_idx = (u32)RS_64(qword3, I40IW_CQ_WQEIDX);
+
+	if (info->q_type == I40IW_CQE_QTYPE_RQ) {
+		info->vlan_valid = (bool)RS_64(qword3, I40IW_VLAN_TAG_VALID);
+		info->l4proto = (u8)RS_64(qword2, I40IW_UDA_L4PROTO);
+		info->l3proto = (u8)RS_64(qword2, I40IW_UDA_L3PROTO);
+		info->payload_len = (u16)RS_64(qword0, I40IW_UDA_PAYLOADLEN);
+	}
+
+	return 0;
+}
+
+/**
+ * i40iw_puda_poll_completion - processes completion for cq
+ * @dev: iwarp device
+ * @cq: cq getting interrupt
+ * @compl_err: return any completion err
+ */
+enum i40iw_status_code i40iw_puda_poll_completion(struct i40iw_sc_dev *dev,
+						  struct i40iw_sc_cq *cq, u32 *compl_err)
+{
+	struct i40iw_qp_uk *qp;
+	struct i40iw_cq_uk *cq_uk = &cq->cq_uk;
+	struct i40iw_puda_completion_info info;
+	enum i40iw_status_code ret = 0;
+	struct i40iw_puda_buf *buf;
+	struct i40iw_puda_rsrc *rsrc;
+	void *sqwrid;
+	u8 cq_type = cq->cq_type;
+	unsigned long	flags;
+
+	if ((cq_type == I40IW_CQ_TYPE_ILQ) || (cq_type == I40IW_CQ_TYPE_IEQ)) {
+		rsrc = (cq_type == I40IW_CQ_TYPE_ILQ) ? dev->ilq : dev->ieq;
+	} else {
+		i40iw_debug(dev, I40IW_DEBUG_PUDA, "%s qp_type error\n", __func__);
+		return I40IW_ERR_BAD_PTR;
+	}
+	memset(&info, 0, sizeof(info));
+	ret = i40iw_puda_poll_info(cq, &info);
+	*compl_err = info.compl_error;
+	if (ret == I40IW_ERR_QUEUE_EMPTY)
+		return ret;
+	if (ret)
+		goto done;
+
+	qp = info.qp;
+	if (!qp || !rsrc) {
+		ret = I40IW_ERR_BAD_PTR;
+		goto done;
+	}
+
+	if (qp->qp_id != rsrc->qp_id) {
+		ret = I40IW_ERR_BAD_PTR;
+		goto done;
+	}
+
+	if (info.q_type == I40IW_CQE_QTYPE_RQ) {
+		buf = (struct i40iw_puda_buf *)(uintptr_t)qp->rq_wrid_array[info.wqe_idx];
+		/* Get all the tcpip information in the buf header */
+		ret = i40iw_puda_get_tcpip_info(&info, buf);
+		if (ret) {
+			rsrc->stats_rcvd_pkt_err++;
+			if (cq_type == I40IW_CQ_TYPE_ILQ) {
+				i40iw_ilq_putback_rcvbuf(&rsrc->qp,
+							 info.wqe_idx);
+			} else {
+				i40iw_puda_ret_bufpool(rsrc, buf);
+				i40iw_puda_replenish_rq(rsrc, false);
+			}
+			goto done;
+		}
+
+		rsrc->stats_pkt_rcvd++;
+		rsrc->compl_rxwqe_idx = info.wqe_idx;
+		i40iw_debug(dev, I40IW_DEBUG_PUDA, "%s RQ completion\n", __func__);
+		rsrc->receive(rsrc->dev, buf);
+		if (cq_type == I40IW_CQ_TYPE_ILQ)
+			i40iw_ilq_putback_rcvbuf(&rsrc->qp, info.wqe_idx);
+		else
+			i40iw_puda_replenish_rq(rsrc, false);
+
+	} else {
+		i40iw_debug(dev, I40IW_DEBUG_PUDA, "%s SQ completion\n", __func__);
+		sqwrid = (void *)(uintptr_t)qp->sq_wrtrk_array[info.wqe_idx].wrid;
+		I40IW_RING_SET_TAIL(qp->sq_ring, info.wqe_idx);
+		rsrc->xmit_complete(rsrc->dev, sqwrid);
+		spin_lock_irqsave(&rsrc->bufpool_lock, flags);
+		rsrc->tx_wqe_avail_cnt++;
+		spin_unlock_irqrestore(&rsrc->bufpool_lock, flags);
+		if (!list_empty(&dev->ilq->txpend))
+			i40iw_puda_send_buf(dev->ilq, NULL);
+	}
+
+done:
+	I40IW_RING_MOVE_HEAD(cq_uk->cq_ring, ret);
+	if (I40IW_RING_GETCURRENT_HEAD(cq_uk->cq_ring) == 0)
+		cq_uk->polarity = !cq_uk->polarity;
+	/* update cq tail in cq shadow memory also */
+	I40IW_RING_MOVE_TAIL(cq_uk->cq_ring);
+	set_64bit_val(cq_uk->shadow_area, 0,
+		      I40IW_RING_GETCURRENT_HEAD(cq_uk->cq_ring));
+	return 0;
+}
+
+/**
+ * i40iw_puda_send - complete send wqe for transmit
+ * @qp: puda qp for send
+ * @info: buffer information for transmit
+ */
+enum i40iw_status_code i40iw_puda_send(struct i40iw_sc_qp *qp,
+				       struct i40iw_puda_send_info *info)
+{
+	u64 *wqe;
+	u32 iplen, l4len;
+	u64 header[2];
+	u32 wqe_idx;
+	u8 iipt;
+
+	/* number of 32 bits DWORDS in header */
+	l4len = info->tcplen >> 2;
+	if (info->ipv4) {
+		iipt = 3;
+		iplen = 5;
+	} else {
+		iipt = 1;
+		iplen = 10;
+	}
+
+	wqe = i40iw_puda_get_next_send_wqe(&qp->qp_uk, &wqe_idx);
+	if (!wqe)
+		return I40IW_ERR_QP_TOOMANY_WRS_POSTED;
+	qp->qp_uk.sq_wrtrk_array[wqe_idx].wrid = (uintptr_t)info->scratch;
+	/* Third line of WQE descriptor */
+	/* maclen is in words */
+	header[0] = LS_64((info->maclen >> 1), I40IW_UDA_QPSQ_MACLEN) |
+		    LS_64(iplen, I40IW_UDA_QPSQ_IPLEN) | LS_64(1, I40IW_UDA_QPSQ_L4T) |
+		    LS_64(iipt, I40IW_UDA_QPSQ_IIPT) |
+		    LS_64(l4len, I40IW_UDA_QPSQ_L4LEN);
+	/* Forth line of WQE descriptor */
+	header[1] = LS_64(I40IW_OP_TYPE_SEND, I40IW_UDA_QPSQ_OPCODE) |
+		    LS_64(1, I40IW_UDA_QPSQ_SIGCOMPL) |
+		    LS_64(info->doloopback, I40IW_UDA_QPSQ_DOLOOPBACK) |
+		    LS_64(qp->qp_uk.swqe_polarity, I40IW_UDA_QPSQ_VALID);
+
+	set_64bit_val(wqe, 0, info->paddr);
+	set_64bit_val(wqe, 8, LS_64(info->len, I40IWQPSQ_FRAG_LEN));
+	set_64bit_val(wqe, 16, header[0]);
+	set_64bit_val(wqe, 24, header[1]);
+
+	i40iw_debug_buf(qp->dev, I40IW_DEBUG_PUDA, "PUDA SEND WQE", wqe, 32);
+	i40iw_qp_post_wr(&qp->qp_uk);
+	return 0;
+}
+
+/**
+ * i40iw_puda_send_buf - transmit puda buffer
+ * @rsrc: resource to use for buffer
+ * @buf: puda buffer to transmit
+ */
+void i40iw_puda_send_buf(struct i40iw_puda_rsrc *rsrc, struct i40iw_puda_buf *buf)
+{
+	struct i40iw_puda_send_info info;
+	enum i40iw_status_code ret = 0;
+	unsigned long	flags;
+
+	spin_lock_irqsave(&rsrc->bufpool_lock, flags);
+	/* if no wqe available or not from a completion and we have
+	 * pending buffers, we must queue new buffer
+	 */
+	if (!rsrc->tx_wqe_avail_cnt || (buf && !list_empty(&rsrc->txpend))) {
+		list_add_tail(&buf->list, &rsrc->txpend);
+		spin_unlock_irqrestore(&rsrc->bufpool_lock, flags);
+		rsrc->stats_sent_pkt_q++;
+		if (rsrc->type == I40IW_PUDA_RSRC_TYPE_ILQ)
+			i40iw_debug(rsrc->dev, I40IW_DEBUG_PUDA,
+				    "%s: adding to txpend\n", __func__);
+		return;
+	}
+	rsrc->tx_wqe_avail_cnt--;
+	/* if we are coming from a completion and have pending buffers
+	 * then Get one from pending list
+	 */
+	if (!buf) {
+		buf = i40iw_puda_get_listbuf(&rsrc->txpend);
+		if (!buf)
+			goto done;
+	}
+
+	info.scratch = (void *)buf;
+	info.paddr = buf->mem.pa;
+	info.len = buf->totallen;
+	info.tcplen = buf->tcphlen;
+	info.maclen = buf->maclen;
+	info.ipv4 = buf->ipv4;
+	info.doloopback = (rsrc->type == I40IW_PUDA_RSRC_TYPE_IEQ);
+
+	ret = i40iw_puda_send(&rsrc->qp, &info);
+	if (ret) {
+		rsrc->tx_wqe_avail_cnt++;
+		rsrc->stats_sent_pkt_q++;
+		list_add(&buf->list, &rsrc->txpend);
+		if (rsrc->type == I40IW_PUDA_RSRC_TYPE_ILQ)
+			i40iw_debug(rsrc->dev, I40IW_DEBUG_PUDA,
+				    "%s: adding to puda_send\n", __func__);
+	} else {
+		rsrc->stats_pkt_sent++;
+	}
+done:
+	spin_unlock_irqrestore(&rsrc->bufpool_lock, flags);
+}
+
+/**
+ * i40iw_puda_qp_setctx - during init, set qp's context
+ * @rsrc: qp's resource
+ */
+static void i40iw_puda_qp_setctx(struct i40iw_puda_rsrc *rsrc)
+{
+	struct i40iw_sc_qp *qp = &rsrc->qp;
+	u64 *qp_ctx = qp->hw_host_ctx;
+
+	set_64bit_val(qp_ctx, 8, qp->sq_pa);
+	set_64bit_val(qp_ctx, 16, qp->rq_pa);
+
+	set_64bit_val(qp_ctx, 24,
+		      LS_64(qp->hw_rq_size, I40IWQPC_RQSIZE) |
+		      LS_64(qp->hw_sq_size, I40IWQPC_SQSIZE));
+
+	set_64bit_val(qp_ctx, 48, LS_64(1514, I40IWQPC_SNDMSS));
+	set_64bit_val(qp_ctx, 56, 0);
+	set_64bit_val(qp_ctx, 64, 1);
+
+	set_64bit_val(qp_ctx, 136,
+		      LS_64(rsrc->cq_id, I40IWQPC_TXCQNUM) |
+		      LS_64(rsrc->cq_id, I40IWQPC_RXCQNUM));
+
+	set_64bit_val(qp_ctx, 160, LS_64(1, I40IWQPC_PRIVEN));
+
+	set_64bit_val(qp_ctx, 168,
+		      LS_64((uintptr_t)qp, I40IWQPC_QPCOMPCTX));
+
+	set_64bit_val(qp_ctx, 176,
+		      LS_64(qp->sq_tph_val, I40IWQPC_SQTPHVAL) |
+		      LS_64(qp->rq_tph_val, I40IWQPC_RQTPHVAL) |
+		      LS_64(qp->qs_handle, I40IWQPC_QSHANDLE));
+
+	i40iw_debug_buf(rsrc->dev, I40IW_DEBUG_PUDA, "PUDA QP CONTEXT",
+			qp_ctx, I40IW_QP_CTX_SIZE);
+}
+
+/**
+ * i40iw_puda_qp_wqe - setup wqe for qp create
+ * @rsrc: resource for qp
+ */
+static enum i40iw_status_code i40iw_puda_qp_wqe(struct i40iw_puda_rsrc *rsrc)
+{
+	struct i40iw_sc_qp *qp = &rsrc->qp;
+	struct i40iw_sc_dev *dev = rsrc->dev;
+	struct i40iw_sc_cqp *cqp;
+	u64 *wqe;
+	u64 header;
+	struct i40iw_ccq_cqe_info compl_info;
+	enum i40iw_status_code status = 0;
+
+	cqp = dev->cqp;
+	wqe = i40iw_sc_cqp_get_next_send_wqe(cqp, 0);
+	if (!wqe)
+		return I40IW_ERR_RING_FULL;
+
+	set_64bit_val(wqe, 16, qp->hw_host_ctx_pa);
+	set_64bit_val(wqe, 40, qp->shadow_area_pa);
+	header = qp->qp_uk.qp_id |
+		 LS_64(I40IW_CQP_OP_CREATE_QP, I40IW_CQPSQ_OPCODE) |
+		 LS_64(I40IW_QP_TYPE_UDA, I40IW_CQPSQ_QP_QPTYPE) |
+		 LS_64(1, I40IW_CQPSQ_QP_CQNUMVALID) |
+		 LS_64(2, I40IW_CQPSQ_QP_NEXTIWSTATE) |
+		 LS_64(cqp->polarity, I40IW_CQPSQ_WQEVALID);
+
+	set_64bit_val(wqe, 24, header);
+
+	i40iw_debug_buf(cqp->dev, I40IW_DEBUG_PUDA, "PUDA CQE", wqe, 32);
+	i40iw_sc_cqp_post_sq(cqp);
+	status = dev->cqp_ops->poll_for_cqp_op_done(dev->cqp,
+						    I40IW_CQP_OP_CREATE_QP,
+						    &compl_info);
+	return status;
+}
+
+/**
+ * i40iw_puda_qp_create - create qp for resource
+ * @rsrc: resource to use for buffer
+ */
+static enum i40iw_status_code i40iw_puda_qp_create(struct i40iw_puda_rsrc *rsrc)
+{
+	struct i40iw_sc_qp *qp = &rsrc->qp;
+	struct i40iw_qp_uk *ukqp = &qp->qp_uk;
+	enum i40iw_status_code ret = 0;
+	u32 sq_size, rq_size, t_size;
+	struct i40iw_dma_mem *mem;
+
+	sq_size = rsrc->sq_size * I40IW_QP_WQE_MIN_SIZE;
+	rq_size = rsrc->rq_size * I40IW_QP_WQE_MIN_SIZE;
+	t_size = (sq_size + rq_size + (I40IW_SHADOW_AREA_SIZE << 3) +
+		  I40IW_QP_CTX_SIZE);
+	/* Get page aligned memory */
+	ret =
+	    i40iw_allocate_dma_mem(rsrc->dev->hw, &rsrc->qpmem, t_size,
+				   I40IW_HW_PAGE_SIZE);
+	if (ret) {
+		i40iw_debug(rsrc->dev, I40IW_DEBUG_PUDA, "%s: error dma mem\n", __func__);
+		return ret;
+	}
+
+	mem = &rsrc->qpmem;
+	memset(mem->va, 0, t_size);
+	qp->hw_sq_size = i40iw_get_encoded_wqe_size(rsrc->sq_size, false);
+	qp->hw_rq_size = i40iw_get_encoded_wqe_size(rsrc->rq_size, false);
+	qp->pd = &rsrc->sc_pd;
+	qp->qp_type = I40IW_QP_TYPE_UDA;
+	qp->dev = rsrc->dev;
+	qp->back_qp = (void *)rsrc;
+	qp->sq_pa = mem->pa;
+	qp->rq_pa = qp->sq_pa + sq_size;
+	ukqp->sq_base = mem->va;
+	ukqp->rq_base = &ukqp->sq_base[rsrc->sq_size];
+	ukqp->shadow_area = ukqp->rq_base[rsrc->rq_size].elem;
+	qp->shadow_area_pa = qp->rq_pa + rq_size;
+	qp->hw_host_ctx = ukqp->shadow_area + I40IW_SHADOW_AREA_SIZE;
+	qp->hw_host_ctx_pa =
+		qp->shadow_area_pa + (I40IW_SHADOW_AREA_SIZE << 3);
+	ukqp->qp_id = rsrc->qp_id;
+	ukqp->sq_wrtrk_array = rsrc->sq_wrtrk_array;
+	ukqp->rq_wrid_array = rsrc->rq_wrid_array;
+
+	ukqp->qp_id = rsrc->qp_id;
+	ukqp->sq_size = rsrc->sq_size;
+	ukqp->rq_size = rsrc->rq_size;
+
+	I40IW_RING_INIT(ukqp->sq_ring, ukqp->sq_size);
+	I40IW_RING_INIT(ukqp->initial_ring, ukqp->sq_size);
+	I40IW_RING_INIT(ukqp->rq_ring, ukqp->rq_size);
+
+	if (qp->pd->dev->is_pf)
+		ukqp->wqe_alloc_reg = (u32 __iomem *)(i40iw_get_hw_addr(qp->pd->dev) +
+						    I40E_PFPE_WQEALLOC);
+	else
+		ukqp->wqe_alloc_reg = (u32 __iomem *)(i40iw_get_hw_addr(qp->pd->dev) +
+						    I40E_VFPE_WQEALLOC1);
+
+	qp->qs_handle = qp->dev->qs_handle;
+	i40iw_puda_qp_setctx(rsrc);
+	ret = i40iw_puda_qp_wqe(rsrc);
+	if (ret)
+		i40iw_free_dma_mem(rsrc->dev->hw, &rsrc->qpmem);
+	return ret;
+}
+
+/**
+ * i40iw_puda_cq_create - create cq for resource
+ * @rsrc: resource for which cq to create
+ */
+static enum i40iw_status_code i40iw_puda_cq_create(struct i40iw_puda_rsrc *rsrc)
+{
+	struct i40iw_sc_dev *dev = rsrc->dev;
+	struct i40iw_sc_cq *cq = &rsrc->cq;
+	u64 *wqe;
+	struct i40iw_sc_cqp *cqp;
+	u64 header;
+	enum i40iw_status_code ret = 0;
+	u32 tsize, cqsize;
+	u32 shadow_read_threshold = 128;
+	struct i40iw_dma_mem *mem;
+	struct i40iw_ccq_cqe_info compl_info;
+	struct i40iw_cq_init_info info;
+	struct i40iw_cq_uk_init_info *init_info = &info.cq_uk_init_info;
+
+	cq->back_cq = (void *)rsrc;
+	cqsize = rsrc->cq_size * (sizeof(struct i40iw_cqe));
+	tsize = cqsize + sizeof(struct i40iw_cq_shadow_area);
+	ret = i40iw_allocate_dma_mem(dev->hw, &rsrc->cqmem, tsize,
+				     I40IW_CQ0_ALIGNMENT_MASK);
+	if (ret)
+		return ret;
+
+	mem = &rsrc->cqmem;
+	memset(&info, 0, sizeof(info));
+	info.dev = dev;
+	info.type = (rsrc->type == I40IW_PUDA_RSRC_TYPE_ILQ) ?
+			 I40IW_CQ_TYPE_ILQ : I40IW_CQ_TYPE_IEQ;
+	info.shadow_read_threshold = rsrc->cq_size >> 2;
+	info.ceq_id_valid = true;
+	info.cq_base_pa = mem->pa;
+	info.shadow_area_pa = mem->pa + cqsize;
+	init_info->cq_base = mem->va;
+	init_info->shadow_area = (u64 *)((u8 *)mem->va + cqsize);
+	init_info->cq_size = rsrc->cq_size;
+	init_info->cq_id = rsrc->cq_id;
+	ret = dev->iw_priv_cq_ops->cq_init(cq, &info);
+	if (ret)
+		goto error;
+	cqp = dev->cqp;
+	wqe = i40iw_sc_cqp_get_next_send_wqe(cqp, 0);
+	if (!wqe) {
+		ret = I40IW_ERR_RING_FULL;
+		goto error;
+	}
+
+	set_64bit_val(wqe, 0, rsrc->cq_size);
+	set_64bit_val(wqe, 8, RS_64_1(cq, 1));
+	set_64bit_val(wqe, 16, LS_64(shadow_read_threshold, I40IW_CQPSQ_CQ_SHADOW_READ_THRESHOLD));
+	set_64bit_val(wqe, 32, cq->cq_pa);
+
+	set_64bit_val(wqe, 40, cq->shadow_area_pa);
+
+	header = rsrc->cq_id |
+	    LS_64(I40IW_CQP_OP_CREATE_CQ, I40IW_CQPSQ_OPCODE) |
+	    LS_64(1, I40IW_CQPSQ_CQ_CHKOVERFLOW) |
+	    LS_64(1, I40IW_CQPSQ_CQ_ENCEQEMASK) |
+	    LS_64(1, I40IW_CQPSQ_CQ_CEQIDVALID) |
+	    LS_64(cqp->polarity, I40IW_CQPSQ_WQEVALID);
+	set_64bit_val(wqe, 24, header);
+
+	i40iw_debug_buf(dev, I40IW_DEBUG_PUDA, "PUDA CQE",
+			wqe, I40IW_CQP_WQE_SIZE * 8);
+
+	i40iw_sc_cqp_post_sq(dev->cqp);
+	ret = dev->cqp_ops->poll_for_cqp_op_done(dev->cqp,
+						 I40IW_CQP_OP_CREATE_CQ,
+						 &compl_info);
+
+error:
+	if (ret)
+		i40iw_free_dma_mem(dev->hw, &rsrc->cqmem);
+	return ret;
+}
+
+/**
+ * i40iw_puda_dele_resources - delete all resources during close
+ * @dev: iwarp device
+ * @type: type of resource to dele
+ * @reset: true if reset chip
+ */
+void i40iw_puda_dele_resources(struct i40iw_sc_dev *dev,
+			       enum puda_resource_type type,
+			       bool reset)
+{
+	struct i40iw_ccq_cqe_info compl_info;
+	struct i40iw_puda_rsrc *rsrc;
+	struct i40iw_puda_buf *buf = NULL;
+	struct i40iw_puda_buf *nextbuf = NULL;
+	struct i40iw_virt_mem *vmem;
+	enum i40iw_status_code ret;
+
+	switch (type) {
+	case I40IW_PUDA_RSRC_TYPE_ILQ:
+		rsrc = dev->ilq;
+		vmem = &dev->ilq_mem;
+		break;
+	case I40IW_PUDA_RSRC_TYPE_IEQ:
+		rsrc = dev->ieq;
+		vmem = &dev->ieq_mem;
+		break;
+	default:
+		i40iw_debug(dev, I40IW_DEBUG_PUDA, "%s: error resource type = 0x%x\n",
+			    __func__, type);
+		return;
+	}
+
+	switch (rsrc->completion) {
+	case PUDA_HASH_CRC_COMPLETE:
+		i40iw_free_hash_desc(&rsrc->hash_desc);
+	case PUDA_QP_CREATED:
+		do {
+			if (reset)
+				break;
+			ret = dev->iw_priv_qp_ops->qp_destroy(&rsrc->qp,
+							      0, false, true, true);
+			if (ret)
+				i40iw_debug(rsrc->dev, I40IW_DEBUG_PUDA,
+					    "%s error ieq qp destroy\n",
+					    __func__);
+
+			ret = dev->cqp_ops->poll_for_cqp_op_done(dev->cqp,
+								 I40IW_CQP_OP_DESTROY_QP,
+								 &compl_info);
+			if (ret)
+				i40iw_debug(rsrc->dev, I40IW_DEBUG_PUDA,
+					    "%s error ieq qp destroy done\n",
+					    __func__);
+		} while (0);
+
+		i40iw_free_dma_mem(dev->hw, &rsrc->qpmem);
+		/* fallthrough */
+	case PUDA_CQ_CREATED:
+		do {
+			if (reset)
+				break;
+			ret = dev->iw_priv_cq_ops->cq_destroy(&rsrc->cq, 0, true);
+			if (ret)
+				i40iw_debug(rsrc->dev, I40IW_DEBUG_PUDA,
+					    "%s error ieq cq destroy\n",
+					    __func__);
+
+			ret = dev->cqp_ops->poll_for_cqp_op_done(dev->cqp,
+								 I40IW_CQP_OP_DESTROY_CQ,
+								 &compl_info);
+			if (ret)
+				i40iw_debug(rsrc->dev, I40IW_DEBUG_PUDA,
+					    "%s error ieq qp destroy done\n",
+					    __func__);
+		} while (0);
+
+		i40iw_free_dma_mem(dev->hw, &rsrc->cqmem);
+		break;
+	default:
+		i40iw_debug(rsrc->dev, I40IW_DEBUG_PUDA, "%s error no resources\n", __func__);
+		break;
+	}
+	/* Free all allocated puda buffers for both tx and rx */
+	buf = rsrc->alloclist;
+	while (buf) {
+		nextbuf = buf->next;
+		i40iw_puda_dele_buf(dev, buf);
+		buf = nextbuf;
+		rsrc->alloc_buf_count--;
+	}
+	i40iw_free_virt_mem(dev->hw, vmem);
+}
+
+/**
+ * i40iw_puda_allocbufs - allocate buffers for resource
+ * @rsrc: resource for buffer allocation
+ * @count: number of buffers to create
+ */
+static enum i40iw_status_code i40iw_puda_allocbufs(struct i40iw_puda_rsrc *rsrc,
+						   u32 count)
+{
+	u32 i;
+	struct i40iw_puda_buf *buf;
+	struct i40iw_puda_buf *nextbuf;
+
+	for (i = 0; i < count; i++) {
+		buf = i40iw_puda_alloc_buf(rsrc->dev, rsrc->buf_size);
+		if (!buf) {
+			rsrc->stats_buf_alloc_fail++;
+			return I40IW_ERR_NO_MEMORY;
+		}
+		i40iw_puda_ret_bufpool(rsrc, buf);
+		rsrc->alloc_buf_count++;
+		if (!rsrc->alloclist) {
+			rsrc->alloclist = buf;
+		} else {
+			nextbuf = rsrc->alloclist;
+			rsrc->alloclist = buf;
+			buf->next = nextbuf;
+		}
+	}
+	rsrc->avail_buf_count = rsrc->alloc_buf_count;
+	return 0;
+}
+
+/**
+ * i40iw_puda_create_rsrc - create resouce (ilq or ieq)
+ * @dev: iwarp device
+ * @info: resource information
+ */
+enum i40iw_status_code i40iw_puda_create_rsrc(struct i40iw_sc_dev *dev,
+					      struct i40iw_puda_rsrc_info *info)
+{
+	enum i40iw_status_code ret = 0;
+	struct i40iw_puda_rsrc *rsrc;
+	u32 pudasize;
+	u32 sqwridsize, rqwridsize;
+	struct i40iw_virt_mem *vmem;
+
+	info->count = 1;
+	pudasize = sizeof(struct i40iw_puda_rsrc);
+	sqwridsize = info->sq_size * sizeof(struct i40iw_sq_uk_wr_trk_info);
+	rqwridsize = info->rq_size * 8;
+	switch (info->type) {
+	case I40IW_PUDA_RSRC_TYPE_ILQ:
+		vmem = &dev->ilq_mem;
+		break;
+	case I40IW_PUDA_RSRC_TYPE_IEQ:
+		vmem = &dev->ieq_mem;
+		break;
+	default:
+		return I40IW_NOT_SUPPORTED;
+	}
+	ret =
+	    i40iw_allocate_virt_mem(dev->hw, vmem,
+				    pudasize + sqwridsize + rqwridsize);
+	if (ret)
+		return ret;
+	rsrc = (struct i40iw_puda_rsrc *)vmem->va;
+	spin_lock_init(&rsrc->bufpool_lock);
+	if (info->type == I40IW_PUDA_RSRC_TYPE_ILQ) {
+		dev->ilq = (struct i40iw_puda_rsrc *)vmem->va;
+		dev->ilq_count = info->count;
+		rsrc->receive = info->receive;
+		rsrc->xmit_complete = info->xmit_complete;
+	} else {
+		vmem = &dev->ieq_mem;
+		dev->ieq_count = info->count;
+		dev->ieq = (struct i40iw_puda_rsrc *)vmem->va;
+		rsrc->receive = i40iw_ieq_receive;
+		rsrc->xmit_complete = i40iw_ieq_tx_compl;
+	}
+
+	rsrc->type = info->type;
+	rsrc->sq_wrtrk_array = (struct i40iw_sq_uk_wr_trk_info *)((u8 *)vmem->va + pudasize);
+	rsrc->rq_wrid_array = (u64 *)((u8 *)vmem->va + pudasize + sqwridsize);
+	rsrc->mss = info->mss;
+	/* Initialize all ieq lists */
+	INIT_LIST_HEAD(&rsrc->bufpool);
+	INIT_LIST_HEAD(&rsrc->txpend);
+
+	rsrc->tx_wqe_avail_cnt = info->sq_size - 1;
+	dev->iw_pd_ops->pd_init(dev, &rsrc->sc_pd, info->pd_id);
+	rsrc->qp_id = info->qp_id;
+	rsrc->cq_id = info->cq_id;
+	rsrc->sq_size = info->sq_size;
+	rsrc->rq_size = info->rq_size;
+	rsrc->cq_size = info->rq_size + info->sq_size;
+	rsrc->buf_size = info->buf_size;
+	rsrc->dev = dev;
+
+	ret = i40iw_puda_cq_create(rsrc);
+	if (!ret) {
+		rsrc->completion = PUDA_CQ_CREATED;
+		ret = i40iw_puda_qp_create(rsrc);
+	}
+	if (ret) {
+		i40iw_debug(dev, I40IW_DEBUG_PUDA, "[%s] error qp_create\n", __func__);
+		goto error;
+	}
+	rsrc->completion = PUDA_QP_CREATED;
+
+	ret = i40iw_puda_allocbufs(rsrc, info->tx_buf_cnt + info->rq_size);
+	if (ret) {
+		i40iw_debug(dev, I40IW_DEBUG_PUDA, "[%s] error allloc_buf\n", __func__);
+		goto error;
+	}
+
+	rsrc->rxq_invalid_cnt = info->rq_size;
+	ret = i40iw_puda_replenish_rq(rsrc, true);
+	if (ret)
+		goto error;
+
+	if (info->type == I40IW_PUDA_RSRC_TYPE_IEQ) {
+		if (!i40iw_init_hash_desc(&rsrc->hash_desc)) {
+			rsrc->check_crc = true;
+			rsrc->completion = PUDA_HASH_CRC_COMPLETE;
+			ret = 0;
+		}
+	}
+
+	dev->ccq_ops->ccq_arm(&rsrc->cq);
+	return ret;
+ error:
+	i40iw_puda_dele_resources(dev, info->type, false);
+
+	return ret;
+}
+
+/**
+ * i40iw_ilq_putback_rcvbuf - ilq buffer to put back on rq
+ * @qp: ilq's qp resource
+ * @wqe_idx:  wqe index of completed rcvbuf
+ */
+static void i40iw_ilq_putback_rcvbuf(struct i40iw_sc_qp *qp, u32 wqe_idx)
+{
+	u64 *wqe;
+	u64 offset24;
+
+	wqe = qp->qp_uk.rq_base[wqe_idx].elem;
+	get_64bit_val(wqe, 24, &offset24);
+	offset24 = (offset24) ? 0 : LS_64(1, I40IWQPSQ_VALID);
+	set_64bit_val(wqe, 24, offset24);
+}
+
+/**
+ * i40iw_ieq_get_fpdu - given length return fpdu length
+ * @length: length if fpdu
+ */
+static u16 i40iw_ieq_get_fpdu_length(u16 length)
+{
+	u16 fpdu_len;
+
+	fpdu_len = length + I40IW_IEQ_MPA_FRAMING;
+	fpdu_len = (fpdu_len + 3) & 0xfffffffc;
+	return fpdu_len;
+}
+
+/**
+ * i40iw_ieq_copy_to_txbuf - copydata from rcv buf to tx buf
+ * @buf: rcv buffer with partial
+ * @txbuf: tx buffer for sendign back
+ * @buf_offset: rcv buffer offset to copy from
+ * @txbuf_offset: at offset in tx buf to copy
+ * @length: length of data to copy
+ */
+static void i40iw_ieq_copy_to_txbuf(struct i40iw_puda_buf *buf,
+				    struct i40iw_puda_buf *txbuf,
+				    u16 buf_offset, u32 txbuf_offset,
+				    u32 length)
+{
+	void *mem1 = (u8 *)buf->mem.va + buf_offset;
+	void *mem2 = (u8 *)txbuf->mem.va + txbuf_offset;
+
+	memcpy(mem2, mem1, length);
+}
+
+/**
+ * i40iw_ieq_setup_tx_buf - setup tx buffer for partial handling
+ * @buf: reeive buffer with partial
+ * @txbuf: buffer to prepare
+ */
+static void i40iw_ieq_setup_tx_buf(struct i40iw_puda_buf *buf,
+				   struct i40iw_puda_buf *txbuf)
+{
+	txbuf->maclen = buf->maclen;
+	txbuf->tcphlen = buf->tcphlen;
+	txbuf->ipv4 = buf->ipv4;
+	txbuf->hdrlen = buf->hdrlen;
+	i40iw_ieq_copy_to_txbuf(buf, txbuf, 0, 0, buf->hdrlen);
+}
+
+/**
+ * i40iw_ieq_check_first_buf - check if rcv buffer's seq is in range
+ * @buf: receive exception buffer
+ * @fps: first partial sequence number
+ */
+static void i40iw_ieq_check_first_buf(struct i40iw_puda_buf *buf, u32 fps)
+{
+	u32 offset;
+
+	if (buf->seqnum < fps) {
+		offset = fps - buf->seqnum;
+		if (offset > buf->datalen)
+			return;
+		buf->data += offset;
+		buf->datalen -= (u16)offset;
+		buf->seqnum = fps;
+	}
+}
+
+/**
+ * i40iw_ieq_compl_pfpdu - write txbuf with full fpdu
+ * @ieq: ieq resource
+ * @rxlist: ieq's received buffer list
+ * @pbufl: temporary list for buffers for fpddu
+ * @txbuf: tx buffer for fpdu
+ * @fpdu_len: total length of fpdu
+ */
+static void  i40iw_ieq_compl_pfpdu(struct i40iw_puda_rsrc *ieq,
+				   struct list_head *rxlist,
+				   struct list_head *pbufl,
+				   struct i40iw_puda_buf *txbuf,
+				   u16 fpdu_len)
+{
+	struct i40iw_puda_buf *buf;
+	u32 nextseqnum;
+	u16 txoffset, bufoffset;
+
+	buf = i40iw_puda_get_listbuf(pbufl);
+	nextseqnum = buf->seqnum + fpdu_len;
+	txbuf->totallen = buf->hdrlen + fpdu_len;
+	txbuf->data = (u8 *)txbuf->mem.va + buf->hdrlen;
+	i40iw_ieq_setup_tx_buf(buf, txbuf);
+
+	txoffset = buf->hdrlen;
+	bufoffset = (u16)(buf->data - (u8 *)buf->mem.va);
+
+	do {
+		if (buf->datalen >= fpdu_len) {
+			/* copied full fpdu */
+			i40iw_ieq_copy_to_txbuf(buf, txbuf, bufoffset, txoffset, fpdu_len);
+			buf->datalen -= fpdu_len;
+			buf->data += fpdu_len;
+			buf->seqnum = nextseqnum;
+			break;
+		}
+		/* copy partial fpdu */
+		i40iw_ieq_copy_to_txbuf(buf, txbuf, bufoffset, txoffset, buf->datalen);
+		txoffset += buf->datalen;
+		fpdu_len -= buf->datalen;
+		i40iw_puda_ret_bufpool(ieq, buf);
+		buf = i40iw_puda_get_listbuf(pbufl);
+		bufoffset = (u16)(buf->data - (u8 *)buf->mem.va);
+	} while (1);
+
+	/* last buffer on the list*/
+	if (buf->datalen)
+		list_add(&buf->list, rxlist);
+	else
+		i40iw_puda_ret_bufpool(ieq, buf);
+}
+
+/**
+ * i40iw_ieq_create_pbufl - create buffer list for single fpdu
+ * @rxlist: resource list for receive ieq buffes
+ * @pbufl: temp. list for buffers for fpddu
+ * @buf: first receive buffer
+ * @fpdu_len: total length of fpdu
+ */
+static enum i40iw_status_code i40iw_ieq_create_pbufl(
+						     struct i40iw_pfpdu *pfpdu,
+						     struct list_head *rxlist,
+						     struct list_head *pbufl,
+						     struct i40iw_puda_buf *buf,
+						     u16 fpdu_len)
+{
+	enum i40iw_status_code status = 0;
+	struct i40iw_puda_buf *nextbuf;
+	u32	nextseqnum;
+	u16 plen = fpdu_len - buf->datalen;
+	bool done = false;
+
+	nextseqnum = buf->seqnum + buf->datalen;
+	do {
+		nextbuf = i40iw_puda_get_listbuf(rxlist);
+		if (!nextbuf) {
+			status = I40IW_ERR_list_empty;
+			break;
+		}
+		list_add_tail(&nextbuf->list, pbufl);
+		if (nextbuf->seqnum != nextseqnum) {
+			pfpdu->bad_seq_num++;
+			status = I40IW_ERR_SEQ_NUM;
+			break;
+		}
+		if (nextbuf->datalen >= plen) {
+			done = true;
+		} else {
+			plen -= nextbuf->datalen;
+			nextseqnum = nextbuf->seqnum + nextbuf->datalen;
+		}
+
+	} while (!done);
+
+	return status;
+}
+
+/**
+ * i40iw_ieq_handle_partial - process partial fpdu buffer
+ * @ieq: ieq resource
+ * @pfpdu: partial management per user qp
+ * @buf: receive buffer
+ * @fpdu_len: fpdu len in the buffer
+ */
+static enum i40iw_status_code i40iw_ieq_handle_partial(struct i40iw_puda_rsrc *ieq,
+						       struct i40iw_pfpdu *pfpdu,
+						       struct i40iw_puda_buf *buf,
+						       u16 fpdu_len)
+{
+	enum i40iw_status_code status = 0;
+	u8 *crcptr;
+	u32 mpacrc;
+	u32 seqnum = buf->seqnum;
+	struct list_head pbufl;	/* partial buffer list */
+	struct i40iw_puda_buf *txbuf = NULL;
+	struct list_head *rxlist = &pfpdu->rxlist;
+
+	INIT_LIST_HEAD(&pbufl);
+	list_add(&buf->list, &pbufl);
+
+	status = i40iw_ieq_create_pbufl(pfpdu, rxlist, &pbufl, buf, fpdu_len);
+	if (!status)
+		goto error;
+
+	txbuf = i40iw_puda_get_bufpool(ieq);
+	if (!txbuf) {
+		pfpdu->no_tx_bufs++;
+		status = I40IW_ERR_NO_TXBUFS;
+		goto error;
+	}
+
+	i40iw_ieq_compl_pfpdu(ieq, rxlist, &pbufl, txbuf, fpdu_len);
+	i40iw_ieq_update_tcpip_info(txbuf, fpdu_len, seqnum);
+	crcptr = txbuf->data + fpdu_len - 4;
+	mpacrc = *(u32 *)crcptr;
+	if (ieq->check_crc) {
+		status = i40iw_ieq_check_mpacrc(&ieq->hash_desc, txbuf->data,
+						(fpdu_len - 4), mpacrc);
+		if (status) {
+			i40iw_debug(ieq->dev, I40IW_DEBUG_IEQ,
+				    "%s: error bad crc\n", __func__);
+			goto error;
+		}
+	}
+
+	i40iw_debug_buf(ieq->dev, I40IW_DEBUG_IEQ, "IEQ TX BUFFER",
+			txbuf->mem.va, txbuf->totallen);
+	i40iw_puda_send_buf(ieq, txbuf);
+	pfpdu->rcv_nxt = seqnum + fpdu_len;
+	return status;
+ error:
+	while (!list_empty(&pbufl)) {
+		buf = (struct i40iw_puda_buf *)(pbufl.prev);
+		list_del(&buf->list);
+		list_add(&buf->list, rxlist);
+	}
+	if (txbuf)
+		i40iw_puda_ret_bufpool(ieq, txbuf);
+	return status;
+}
+
+/**
+ * i40iw_ieq_process_buf - process buffer rcvd for ieq
+ * @ieq: ieq resource
+ * @pfpdu: partial management per user qp
+ * @buf: receive buffer
+ */
+static enum i40iw_status_code i40iw_ieq_process_buf(struct i40iw_puda_rsrc *ieq,
+						    struct i40iw_pfpdu *pfpdu,
+						    struct i40iw_puda_buf *buf)
+{
+	u16 fpdu_len = 0;
+	u16 datalen = buf->datalen;
+	u8 *datap = buf->data;
+	u8 *crcptr;
+	u16 ioffset = 0;
+	u32 mpacrc;
+	u32 seqnum = buf->seqnum;
+	u16 length = 0;
+	u16 full = 0;
+	bool partial = false;
+	struct i40iw_puda_buf *txbuf;
+	struct list_head *rxlist = &pfpdu->rxlist;
+	enum i40iw_status_code ret = 0;
+	enum i40iw_status_code status = 0;
+
+	ioffset = (u16)(buf->data - (u8 *)buf->mem.va);
+	while (datalen) {
+		fpdu_len = i40iw_ieq_get_fpdu_length(ntohs(*(u16 *)datap));
+		if (fpdu_len > pfpdu->max_fpdu_data) {
+			i40iw_debug(ieq->dev, I40IW_DEBUG_IEQ,
+				    "%s: error bad fpdu_len\n", __func__);
+			status = I40IW_ERR_MPA_CRC;
+			list_add(&buf->list, rxlist);
+			return status;
+		}
+
+		if (datalen < fpdu_len) {
+			partial = true;
+			break;
+		}
+		crcptr = datap + fpdu_len - 4;
+		mpacrc = *(u32 *)crcptr;
+		if (ieq->check_crc)
+			ret = i40iw_ieq_check_mpacrc(&ieq->hash_desc,
+						     datap, fpdu_len - 4, mpacrc);
+		if (ret) {
+			status = I40IW_ERR_MPA_CRC;
+			list_add(&buf->list, rxlist);
+			return status;
+		}
+		full++;
+		pfpdu->fpdu_processed++;
+		datap += fpdu_len;
+		length += fpdu_len;
+		datalen -= fpdu_len;
+	}
+	if (full) {
+		/* copy full pdu's in the txbuf and send them out */
+		txbuf = i40iw_puda_get_bufpool(ieq);
+		if (!txbuf) {
+			pfpdu->no_tx_bufs++;
+			status = I40IW_ERR_NO_TXBUFS;
+			list_add(&buf->list, rxlist);
+			return status;
+		}
+		/* modify txbuf's buffer header */
+		i40iw_ieq_setup_tx_buf(buf, txbuf);
+		/* copy full fpdu's to new buffer */
+		i40iw_ieq_copy_to_txbuf(buf, txbuf, ioffset, buf->hdrlen,
+					length);
+		txbuf->totallen = buf->hdrlen + length;
+
+		i40iw_ieq_update_tcpip_info(txbuf, length, buf->seqnum);
+		i40iw_puda_send_buf(ieq, txbuf);
+
+		if (!datalen) {
+			pfpdu->rcv_nxt = buf->seqnum + length;
+			i40iw_puda_ret_bufpool(ieq, buf);
+			return status;
+		}
+		buf->data = datap;
+		buf->seqnum = seqnum + length;
+		buf->datalen = datalen;
+		pfpdu->rcv_nxt = buf->seqnum;
+	}
+	if (partial)
+		status = i40iw_ieq_handle_partial(ieq, pfpdu, buf, fpdu_len);
+
+	return status;
+}
+
+/**
+ * i40iw_ieq_process_fpdus - process fpdu's buffers on its list
+ * @qp: qp for which partial fpdus
+ * @ieq: ieq resource
+ */
+static void i40iw_ieq_process_fpdus(struct i40iw_sc_qp *qp,
+				    struct i40iw_puda_rsrc *ieq)
+{
+	struct i40iw_pfpdu *pfpdu = &qp->pfpdu;
+	struct list_head *rxlist = &pfpdu->rxlist;
+	struct i40iw_puda_buf *buf;
+	enum i40iw_status_code status;
+
+	do {
+		if (list_empty(rxlist))
+			break;
+		buf = i40iw_puda_get_listbuf(rxlist);
+		if (!buf) {
+			i40iw_debug(ieq->dev, I40IW_DEBUG_IEQ,
+				    "%s: error no buf\n", __func__);
+			break;
+		}
+		if (buf->seqnum != pfpdu->rcv_nxt) {
+			/* This could be out of order or missing packet */
+			pfpdu->out_of_order++;
+			list_add(&buf->list, rxlist);
+			break;
+		}
+		/* keep processing buffers from the head of the list */
+		status = i40iw_ieq_process_buf(ieq, pfpdu, buf);
+		if (status == I40IW_ERR_MPA_CRC) {
+			pfpdu->mpa_crc_err = true;
+			while (!list_empty(rxlist)) {
+				buf = i40iw_puda_get_listbuf(rxlist);
+				i40iw_puda_ret_bufpool(ieq, buf);
+				pfpdu->crc_err++;
+			}
+			/* create CQP for AE */
+			i40iw_ieq_mpa_crc_ae(ieq->dev, qp);
+		}
+	} while (!status);
+}
+
+/**
+ * i40iw_ieq_handle_exception - handle qp's exception
+ * @ieq: ieq resource
+ * @qp: qp receiving excpetion
+ * @buf: receive buffer
+ */
+static void i40iw_ieq_handle_exception(struct i40iw_puda_rsrc *ieq,
+				       struct i40iw_sc_qp *qp,
+				       struct i40iw_puda_buf *buf)
+{
+	struct i40iw_puda_buf *tmpbuf = NULL;
+	struct i40iw_pfpdu *pfpdu = &qp->pfpdu;
+	u32 *hw_host_ctx = (u32 *)qp->hw_host_ctx;
+	u32 rcv_wnd = hw_host_ctx[23];
+	/* first partial seq # in q2 */
+	u32 fps = qp->q2_buf[16];
+	struct list_head *rxlist = &pfpdu->rxlist;
+	struct list_head *plist;
+
+	pfpdu->total_ieq_bufs++;
+
+	if (pfpdu->mpa_crc_err) {
+		pfpdu->crc_err++;
+		goto error;
+	}
+	if (pfpdu->mode && (fps != pfpdu->fps)) {
+		/* clean up qp as it is new partial sequence */
+		i40iw_ieq_cleanup_qp(ieq->dev, qp);
+		i40iw_debug(ieq->dev, I40IW_DEBUG_IEQ,
+			    "%s: restarting new partial\n", __func__);
+		pfpdu->mode = false;
+	}
+
+	if (!pfpdu->mode) {
+		i40iw_debug_buf(ieq->dev, I40IW_DEBUG_IEQ, "Q2 BUFFER", (u64 *)qp->q2_buf, 128);
+		/* First_Partial_Sequence_Number check */
+		pfpdu->rcv_nxt = fps;
+		pfpdu->fps = fps;
+		pfpdu->mode = true;
+		pfpdu->max_fpdu_data = ieq->mss;
+		pfpdu->pmode_count++;
+		INIT_LIST_HEAD(rxlist);
+		i40iw_ieq_check_first_buf(buf, fps);
+	}
+
+	if (!(rcv_wnd >= (buf->seqnum - pfpdu->rcv_nxt))) {
+		pfpdu->bad_seq_num++;
+		goto error;
+	}
+
+	if (!list_empty(rxlist)) {
+		tmpbuf = (struct i40iw_puda_buf *)rxlist->next;
+		plist = &tmpbuf->list;
+		while ((struct list_head *)tmpbuf != rxlist) {
+			if ((int)(buf->seqnum - tmpbuf->seqnum) < 0)
+				break;
+			tmpbuf = (struct i40iw_puda_buf *)plist->next;
+		}
+		/* Insert buf before tmpbuf */
+		list_add_tail(&buf->list, &tmpbuf->list);
+	} else {
+		list_add_tail(&buf->list, rxlist);
+	}
+	i40iw_ieq_process_fpdus(qp, ieq);
+	return;
+ error:
+	i40iw_puda_ret_bufpool(ieq, buf);
+}
+
+/**
+ * i40iw_ieq_receive - received exception buffer
+ * @dev: iwarp device
+ * @buf: exception buffer received
+ */
+static void i40iw_ieq_receive(struct i40iw_sc_dev *dev,
+			      struct i40iw_puda_buf *buf)
+{
+	struct i40iw_puda_rsrc *ieq = dev->ieq;
+	struct i40iw_sc_qp *qp = NULL;
+	u32 wqe_idx = ieq->compl_rxwqe_idx;
+
+	qp = i40iw_ieq_get_qp(dev, buf);
+	if (!qp) {
+		ieq->stats_bad_qp_id++;
+		i40iw_puda_ret_bufpool(ieq, buf);
+	} else {
+		i40iw_ieq_handle_exception(ieq, qp, buf);
+	}
+	/*
+	 * ieq->rx_wqe_idx is used by i40iw_puda_replenish_rq()
+	 * on which wqe_idx to start replenish rq
+	 */
+	if (!ieq->rxq_invalid_cnt)
+		ieq->rx_wqe_idx = wqe_idx;
+	ieq->rxq_invalid_cnt++;
+}
+
+/**
+ * i40iw_ieq_tx_compl - put back after sending completed exception buffer
+ * @dev: iwarp device
+ * @sqwrid: pointer to puda buffer
+ */
+static void i40iw_ieq_tx_compl(struct i40iw_sc_dev *dev, void *sqwrid)
+{
+	struct i40iw_puda_rsrc *ieq = dev->ieq;
+	struct i40iw_puda_buf *buf = (struct i40iw_puda_buf *)sqwrid;
+
+	i40iw_puda_ret_bufpool(ieq, buf);
+	if (!list_empty(&ieq->txpend)) {
+		buf = i40iw_puda_get_listbuf(&ieq->txpend);
+		i40iw_puda_send_buf(ieq, buf);
+	}
+}
+
+/**
+ * i40iw_ieq_cleanup_qp - qp is being destroyed
+ * @dev: iwarp device
+ * @qp: all pending fpdu buffers
+ */
+void i40iw_ieq_cleanup_qp(struct i40iw_sc_dev *dev, struct i40iw_sc_qp *qp)
+{
+	struct i40iw_puda_buf *buf;
+	struct i40iw_pfpdu *pfpdu = &qp->pfpdu;
+	struct list_head *rxlist = &pfpdu->rxlist;
+	struct i40iw_puda_rsrc *ieq = dev->ieq;
+
+	if (!pfpdu->mode)
+		return;
+	while (!list_empty(rxlist)) {
+		buf = i40iw_puda_get_listbuf(rxlist);
+		i40iw_puda_ret_bufpool(ieq, buf);
+	}
+}

drivers/infiniband/hw/i40iw/i40iw_puda.h

+/*******************************************************************************
+*
+* Copyright (c) 2015-2016 Intel Corporation.  All rights reserved.
+*
+* This software is available to you under a choice of one of two
+* licenses.  You may choose to be licensed under the terms of the GNU
+* General Public License (GPL) Version 2, available from the file
+* COPYING in the main directory of this source tree, or the
+* OpenFabrics.org BSD license below:
+*
+*   Redistribution and use in source and binary forms, with or
+*   without modification, are permitted provided that the following
+*   conditions are met:
+*
+*    - Redistributions of source code must retain the above
+*	copyright notice, this list of conditions and the following
+*	disclaimer.
+*
+*    - Redistributions in binary form must reproduce the above
+*	copyright notice, this list of conditions and the following
+*	disclaimer in the documentation and/or other materials
+*	provided with the distribution.
+*
+* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+* SOFTWARE.
+*
+*******************************************************************************/
+
+#ifndef I40IW_PUDA_H
+#define I40IW_PUDA_H
+
+#define I40IW_IEQ_MPA_FRAMING 6
+
+struct i40iw_sc_dev;
+struct i40iw_sc_qp;
+struct i40iw_sc_cq;
+
+enum puda_resource_type {
+	I40IW_PUDA_RSRC_TYPE_ILQ = 1,
+	I40IW_PUDA_RSRC_TYPE_IEQ
+};
+
+enum puda_rsrc_complete {
+	PUDA_CQ_CREATED = 1,
+	PUDA_QP_CREATED,
+	PUDA_TX_COMPLETE,
+	PUDA_RX_COMPLETE,
+	PUDA_HASH_CRC_COMPLETE
+};
+
+struct i40iw_puda_completion_info {
+	struct i40iw_qp_uk *qp;
+	u8 q_type;
+	u8 vlan_valid;
+	u8 l3proto;
+	u8 l4proto;
+	u16 payload_len;
+	u32 compl_error;	/* No_err=0, else major and minor err code */
+	u32 qp_id;
+	u32 wqe_idx;
+};
+
+struct i40iw_puda_send_info {
+	u64 paddr;		/* Physical address */
+	u32 len;
+	u8 tcplen;
+	u8 maclen;
+	bool ipv4;
+	bool doloopback;
+	void *scratch;
+};
+
+struct i40iw_puda_buf {
+	struct list_head list;	/* MUST be first entry */
+	struct i40iw_dma_mem mem;	/* DMA memory for the buffer */
+	struct i40iw_puda_buf *next;	/* for alloclist in rsrc struct */
+	struct i40iw_virt_mem buf_mem;	/* Buffer memory for this buffer */
+	void *scratch;
+	u8 *iph;
+	u8 *tcph;
+	u8 *data;
+	u16 datalen;
+	u16 vlan_id;
+	u8 tcphlen;		/* tcp length in bytes */
+	u8 maclen;		/* mac length in bytes */
+	u32 totallen;		/* machlen+iphlen+tcphlen+datalen */
+	atomic_t refcount;
+	u8 hdrlen;
+	bool ipv4;
+	u32 seqnum;
+};
+
+struct i40iw_puda_rsrc_info {
+	enum puda_resource_type type;	/* ILQ or IEQ */
+	u32 count;
+	u16 pd_id;
+	u32 cq_id;
+	u32 qp_id;
+	u32 sq_size;
+	u32 rq_size;
+	u16 buf_size;
+	u16 mss;
+	u32 tx_buf_cnt;		/* total bufs allocated will be rq_size + tx_buf_cnt */
+	void (*receive)(struct i40iw_sc_dev *, struct i40iw_puda_buf *);
+	void (*xmit_complete)(struct i40iw_sc_dev *, void *);
+};
+
+struct i40iw_puda_rsrc {
+	struct i40iw_sc_cq cq;
+	struct i40iw_sc_qp qp;
+	struct i40iw_sc_pd sc_pd;
+	struct i40iw_sc_dev *dev;
+	struct i40iw_dma_mem cqmem;
+	struct i40iw_dma_mem qpmem;
+	struct i40iw_virt_mem ilq_mem;
+	enum puda_rsrc_complete completion;
+	enum puda_resource_type type;
+	u16 buf_size;		/*buffer must be max datalen + tcpip hdr + mac */
+	u16 mss;
+	u32 cq_id;
+	u32 qp_id;
+	u32 sq_size;
+	u32 rq_size;
+	u32 cq_size;
+	struct i40iw_sq_uk_wr_trk_info *sq_wrtrk_array;
+	u64 *rq_wrid_array;
+	u32 compl_rxwqe_idx;
+	u32 rx_wqe_idx;
+	u32 rxq_invalid_cnt;
+	u32 tx_wqe_avail_cnt;
+	bool check_crc;
+	struct hash_desc hash_desc;
+	struct list_head txpend;
+	struct list_head bufpool;	/* free buffers pool list for recv and xmit */
+	u32 alloc_buf_count;
+	u32 avail_buf_count;		/* snapshot of currently available buffers */
+	spinlock_t bufpool_lock;
+	struct i40iw_puda_buf *alloclist;
+	void (*receive)(struct i40iw_sc_dev *, struct i40iw_puda_buf *);
+	void (*xmit_complete)(struct i40iw_sc_dev *, void *);
+	/* puda stats */
+	u64 stats_buf_alloc_fail;
+	u64 stats_pkt_rcvd;
+	u64 stats_pkt_sent;
+	u64 stats_rcvd_pkt_err;
+	u64 stats_sent_pkt_q;
+	u64 stats_bad_qp_id;
+};
+
+struct i40iw_puda_buf *i40iw_puda_get_bufpool(struct i40iw_puda_rsrc *rsrc);
+void i40iw_puda_ret_bufpool(struct i40iw_puda_rsrc *rsrc,
+			    struct i40iw_puda_buf *buf);
+void i40iw_puda_send_buf(struct i40iw_puda_rsrc *rsrc,
+			 struct i40iw_puda_buf *buf);
+enum i40iw_status_code i40iw_puda_send(struct i40iw_sc_qp *qp,
+				       struct i40iw_puda_send_info *info);
+enum i40iw_status_code i40iw_puda_create_rsrc(struct i40iw_sc_dev *dev,
+					      struct i40iw_puda_rsrc_info *info);
+void i40iw_puda_dele_resources(struct i40iw_sc_dev *dev,
+			       enum puda_resource_type type,
+			       bool reset);
+enum i40iw_status_code i40iw_puda_poll_completion(struct i40iw_sc_dev *dev,
+						  struct i40iw_sc_cq *cq, u32 *compl_err);
+void i40iw_ieq_cleanup_qp(struct i40iw_sc_dev *dev, struct i40iw_sc_qp *qp);
+
+struct i40iw_sc_qp *i40iw_ieq_get_qp(struct i40iw_sc_dev *dev,
+				     struct i40iw_puda_buf *buf);
+enum i40iw_status_code i40iw_puda_get_tcpip_info(struct i40iw_puda_completion_info *info,
+						 struct i40iw_puda_buf *buf);
+enum i40iw_status_code i40iw_ieq_check_mpacrc(struct hash_desc *desc,
+					      void *addr, u32 length, u32 value);
+enum i40iw_status_code i40iw_init_hash_desc(struct hash_desc *desc);
+void i40iw_ieq_mpa_crc_ae(struct i40iw_sc_dev *dev, struct i40iw_sc_qp *qp);
+void i40iw_free_hash_desc(struct hash_desc *desc);
+void i40iw_ieq_update_tcpip_info(struct i40iw_puda_buf *buf, u16 length,
+				 u32 seqnum);
+#endif