i40iw: Set 128B as the only supported RQ WQE size

RQ WQE size other than 128B is not supported.  Correct
RQ size calculation to use 128B only.

Since this breaks ABI, add additional code to
provide compatibility with v4 user provider, libi40iw.

Signed-off-by: Chien Tin Tung <chien.tin.tung@intel.com>
Signed-off-by: Henry Orosco <henry.orosco@intel.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>

8 files changed, 53 insertions, 25 deletions

diff --git a/drivers/infiniband/hw/i40iw/i40iw_ctrl.c b/drivers/infiniband/hw/i40iw/i40iw_ctrl.c
index 392f78384a60..98923a8cf86d 100644
--- a/drivers/infiniband/hw/i40iw/i40iw_ctrl.c
+++ b/drivers/infiniband/hw/i40iw/i40iw_ctrl.c
@@ -358,13 +358,16 @@ void i40iw_qp_add_qos(struct i40iw_sc_qp *qp)
  * @dev: sc device struct
  * @pd: sc pd ptr
  * @pd_id: pd_id for allocated pd
+ * @abi_ver: ABI version from user context, -1 if not valid
  */
 static void i40iw_sc_pd_init(struct i40iw_sc_dev *dev,
 			     struct i40iw_sc_pd *pd,
-			     u16 pd_id)
+			     u16 pd_id,
+			     int abi_ver)
 {
 	pd->size = sizeof(*pd);
 	pd->pd_id = pd_id;
+	pd->abi_ver = abi_ver;
 	pd->dev = dev;
 }
 
@@ -2252,6 +2255,7 @@ static enum i40iw_status_code i40iw_sc_qp_init(struct i40iw_sc_qp *qp,
 					      offset);
 
 	info->qp_uk_init_info.wqe_alloc_reg = wqe_alloc_reg;
+	info->qp_uk_init_info.abi_ver = qp->pd->abi_ver;
 	ret_code = i40iw_qp_uk_init(&qp->qp_uk, &info->qp_uk_init_info);
 	if (ret_code)
 		return ret_code;
@@ -2270,10 +2274,21 @@ static enum i40iw_status_code i40iw_sc_qp_init(struct i40iw_sc_qp *qp,
 						    false);
 	i40iw_debug(qp->dev, I40IW_DEBUG_WQE, "%s: hw_sq_size[%04d] sq_ring.size[%04d]\n",
 		    __func__, qp->hw_sq_size, qp->qp_uk.sq_ring.size);
-	ret_code = i40iw_fragcnt_to_wqesize_rq(qp->qp_uk.max_rq_frag_cnt,
-					       &wqe_size);
-	if (ret_code)
-		return ret_code;
+
+	switch (qp->pd->abi_ver) {
+	case 4:
+		ret_code = i40iw_fragcnt_to_wqesize_rq(qp->qp_uk.max_rq_frag_cnt,
+						       &wqe_size);
+		if (ret_code)
+			return ret_code;
+		break;
+	case 5: /* fallthrough until next ABI version */
+	default:
+		if (qp->qp_uk.max_rq_frag_cnt > I40IW_MAX_WQ_FRAGMENT_COUNT)
+			return I40IW_ERR_INVALID_FRAG_COUNT;
+		wqe_size = I40IW_MAX_WQE_SIZE_RQ;
+		break;
+	}
 	qp->hw_rq_size = i40iw_get_encoded_wqe_size(qp->qp_uk.rq_size *
 				(wqe_size / I40IW_QP_WQE_MIN_SIZE), false);
 	i40iw_debug(qp->dev, I40IW_DEBUG_WQE,
diff --git a/drivers/infiniband/hw/i40iw/i40iw_puda.c b/drivers/infiniband/hw/i40iw/i40iw_puda.c
index 449ba8c81ce7..db41ab40da9c 100644
--- a/drivers/infiniband/hw/i40iw/i40iw_puda.c
+++ b/drivers/infiniband/hw/i40iw/i40iw_puda.c
@@ -930,7 +930,7 @@ enum i40iw_status_code i40iw_puda_create_rsrc(struct i40iw_sc_vsi *vsi,
 	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);
+	dev->iw_pd_ops->pd_init(dev, &rsrc->sc_pd, info->pd_id, -1);
 	rsrc->qp_id = info->qp_id;
 	rsrc->cq_id = info->cq_id;
 	rsrc->sq_size = info->sq_size;
diff --git a/drivers/infiniband/hw/i40iw/i40iw_type.h b/drivers/infiniband/hw/i40iw/i40iw_type.h
index f3f8e9cc3c05..7b76259752b0 100644
--- a/drivers/infiniband/hw/i40iw/i40iw_type.h
+++ b/drivers/infiniband/hw/i40iw/i40iw_type.h
@@ -280,6 +280,7 @@ struct i40iw_sc_pd {
 	u32 size;
 	struct i40iw_sc_dev *dev;
 	u16 pd_id;
+	int abi_ver;
 };
 
 struct i40iw_cqp_quanta {
@@ -852,6 +853,7 @@ struct i40iw_qp_init_info {
 	u64 host_ctx_pa;
 	u64 q2_pa;
 	u64 shadow_area_pa;
+	int abi_ver;
 	u8 sq_tph_val;
 	u8 rq_tph_val;
 	u8 type;
@@ -1051,7 +1053,7 @@ struct i40iw_aeq_ops {
 };
 
 struct i40iw_pd_ops {
-	void (*pd_init)(struct i40iw_sc_dev *, struct i40iw_sc_pd *, u16);
+	void (*pd_init)(struct i40iw_sc_dev *, struct i40iw_sc_pd *, u16, int);
 };
 
 struct i40iw_priv_qp_ops {
diff --git a/drivers/infiniband/hw/i40iw/i40iw_ucontext.h b/drivers/infiniband/hw/i40iw/i40iw_ucontext.h
index 12acd688def4..57d3f1d11ff1 100644
--- a/drivers/infiniband/hw/i40iw/i40iw_ucontext.h
+++ b/drivers/infiniband/hw/i40iw/i40iw_ucontext.h
@@ -39,8 +39,8 @@
 
 #include <linux/types.h>
 
-#define I40IW_ABI_USERSPACE_VER 4
-#define I40IW_ABI_KERNEL_VER    4
+#define I40IW_ABI_VER 5
+
 struct i40iw_alloc_ucontext_req {
 	__u32 reserved32;
 	__u8 userspace_ver;
diff --git a/drivers/infiniband/hw/i40iw/i40iw_uk.c b/drivers/infiniband/hw/i40iw/i40iw_uk.c
index 4376cd628774..2800f796271c 100644
--- a/drivers/infiniband/hw/i40iw/i40iw_uk.c
+++ b/drivers/infiniband/hw/i40iw/i40iw_uk.c
@@ -966,10 +966,6 @@ enum i40iw_status_code i40iw_qp_uk_init(struct i40iw_qp_uk *qp,
 	if (ret_code)
 		return ret_code;
 
-	ret_code = i40iw_get_wqe_shift(info->rq_size, info->max_rq_frag_cnt, 0, &rqshift);
-	if (ret_code)
-		return ret_code;
-
 	qp->sq_base = info->sq;
 	qp->rq_base = info->rq;
 	qp->shadow_area = info->shadow_area;
@@ -998,8 +994,19 @@ enum i40iw_status_code i40iw_qp_uk_init(struct i40iw_qp_uk *qp,
 	if (!qp->use_srq) {
 		qp->rq_size = info->rq_size;
 		qp->max_rq_frag_cnt = info->max_rq_frag_cnt;
-		qp->rq_wqe_size = rqshift;
 		I40IW_RING_INIT(qp->rq_ring, qp->rq_size);
+		switch (info->abi_ver) {
+		case 4:
+			ret_code = i40iw_get_wqe_shift(info->rq_size, info->max_rq_frag_cnt, 0, &rqshift);
+			if (ret_code)
+				return ret_code;
+			break;
+		case 5: /* fallthrough until next ABI version */
+		default:
+			rqshift = I40IW_MAX_RQ_WQE_SHIFT;
+			break;
+		}
+		qp->rq_wqe_size = rqshift;
 		qp->rq_wqe_size_multiplier = 4 << rqshift;
 	}
 	qp->ops = iw_qp_uk_ops;
diff --git a/drivers/infiniband/hw/i40iw/i40iw_user.h b/drivers/infiniband/hw/i40iw/i40iw_user.h
index 80d9f464f65e..84be6f13b9c5 100644
--- a/drivers/infiniband/hw/i40iw/i40iw_user.h
+++ b/drivers/infiniband/hw/i40iw/i40iw_user.h
@@ -76,6 +76,7 @@ enum i40iw_device_capabilities_const {
 	I40IW_MAX_ORD_SIZE =			127,
 	I40IW_MAX_WQ_ENTRIES =			2048,
 	I40IW_Q2_BUFFER_SIZE =			(248 + 100),
+	I40IW_MAX_WQE_SIZE_RQ =			128,
 	I40IW_QP_CTX_SIZE =			248,
 	I40IW_MAX_PDS = 			32768
 };
@@ -97,6 +98,7 @@ enum i40iw_device_capabilities_const {
 #define i40iw_address_list u64 *
 
 #define	I40IW_MAX_MR_SIZE	0x10000000000L
+#define	I40IW_MAX_RQ_WQE_SHIFT	2
 
 struct i40iw_qp_uk;
 struct i40iw_cq_uk;
@@ -405,7 +407,7 @@ struct i40iw_qp_uk_init_info {
 	u32 max_sq_frag_cnt;
 	u32 max_rq_frag_cnt;
 	u32 max_inline_data;
-
+	int abi_ver;
 };
 
 struct i40iw_cq_uk_init_info {
diff --git a/drivers/infiniband/hw/i40iw/i40iw_verbs.c b/drivers/infiniband/hw/i40iw/i40iw_verbs.c
index 7368a50bbdaa..29e97df9e1a7 100644
--- a/drivers/infiniband/hw/i40iw/i40iw_verbs.c
+++ b/drivers/infiniband/hw/i40iw/i40iw_verbs.c
@@ -145,9 +145,8 @@ static struct ib_ucontext *i40iw_alloc_ucontext(struct ib_device *ibdev,
 	if (ib_copy_from_udata(&req, udata, sizeof(req)))
 		return ERR_PTR(-EINVAL);
 
-	if (req.userspace_ver != I40IW_ABI_USERSPACE_VER) {
-		i40iw_pr_err("Invalid userspace driver version detected. Detected version %d, should be %d\n",
-			     req.userspace_ver, I40IW_ABI_USERSPACE_VER);
+	if (req.userspace_ver < 4 || req.userspace_ver > I40IW_ABI_VER) {
+		i40iw_pr_err("Unsupported provider library version %u.\n", req.userspace_ver);
 		return ERR_PTR(-EINVAL);
 	}
 
@@ -155,13 +154,14 @@ static struct ib_ucontext *i40iw_alloc_ucontext(struct ib_device *ibdev,
 	uresp.max_qps = iwdev->max_qp;
 	uresp.max_pds = iwdev->max_pd;
 	uresp.wq_size = iwdev->max_qp_wr * 2;
-	uresp.kernel_ver = I40IW_ABI_KERNEL_VER;
+	uresp.kernel_ver = req.userspace_ver;
 
 	ucontext = kzalloc(sizeof(*ucontext), GFP_KERNEL);
 	if (!ucontext)
 		return ERR_PTR(-ENOMEM);
 
 	ucontext->iwdev = iwdev;
+	ucontext->abi_ver = req.userspace_ver;
 
 	if (ib_copy_to_udata(udata, &uresp, sizeof(uresp))) {
 		kfree(ucontext);
@@ -333,6 +333,7 @@ static struct ib_pd *i40iw_alloc_pd(struct ib_device *ibdev,
 	struct i40iw_sc_dev *dev = &iwdev->sc_dev;
 	struct i40iw_alloc_pd_resp uresp;
 	struct i40iw_sc_pd *sc_pd;
+	struct i40iw_ucontext *ucontext;
 	u32 pd_id = 0;
 	int err;
 
@@ -353,15 +354,18 @@ static struct ib_pd *i40iw_alloc_pd(struct ib_device *ibdev,
 	}
 
 	sc_pd = &iwpd->sc_pd;
-	dev->iw_pd_ops->pd_init(dev, sc_pd, pd_id);
 
 	if (context) {
+		ucontext = to_ucontext(context);
+		dev->iw_pd_ops->pd_init(dev, sc_pd, pd_id, ucontext->abi_ver);
 		memset(&uresp, 0, sizeof(uresp));
 		uresp.pd_id = pd_id;
 		if (ib_copy_to_udata(udata, &uresp, sizeof(uresp))) {
 			err = -EFAULT;
 			goto error;
 		}
+	} else {
+		dev->iw_pd_ops->pd_init(dev, sc_pd, pd_id, -1);
 	}
 
 	i40iw_add_pdusecount(iwpd);
@@ -518,7 +522,7 @@ static int i40iw_setup_kmode_qp(struct i40iw_device *iwdev,
 	struct i40iw_dma_mem *mem = &iwqp->kqp.dma_mem;
 	u32 sqdepth, rqdepth;
 	u32 sq_size, rq_size;
-	u8 sqshift, rqshift;
+	u8 sqshift;
 	u32 size;
 	enum i40iw_status_code status;
 	struct i40iw_qp_uk_init_info *ukinfo = &info->qp_uk_init_info;
@@ -527,14 +531,11 @@ static int i40iw_setup_kmode_qp(struct i40iw_device *iwdev,
 	rq_size = i40iw_qp_roundup(ukinfo->rq_size + 1);
 
 	status = i40iw_get_wqe_shift(sq_size, ukinfo->max_sq_frag_cnt, ukinfo->max_inline_data, &sqshift);
-	if (!status)
-		status = i40iw_get_wqe_shift(rq_size, ukinfo->max_rq_frag_cnt, 0, &rqshift);
-
 	if (status)
 		return -ENOMEM;
 
 	sqdepth = sq_size << sqshift;
-	rqdepth = rq_size << rqshift;
+	rqdepth = rq_size << I40IW_MAX_RQ_WQE_SHIFT;
 
 	size = sqdepth * sizeof(struct i40iw_sq_uk_wr_trk_info) + (rqdepth << 3);
 	iwqp->kqp.wrid_mem = kzalloc(size, GFP_KERNEL);
diff --git a/drivers/infiniband/hw/i40iw/i40iw_verbs.h b/drivers/infiniband/hw/i40iw/i40iw_verbs.h
index 6549c939500f..07c3fec77de6 100644
--- a/drivers/infiniband/hw/i40iw/i40iw_verbs.h
+++ b/drivers/infiniband/hw/i40iw/i40iw_verbs.h
@@ -42,6 +42,7 @@ struct i40iw_ucontext {
 	spinlock_t cq_reg_mem_list_lock; /* memory list for cq's */
 	struct list_head qp_reg_mem_list;
 	spinlock_t qp_reg_mem_list_lock; /* memory list for qp's */
+	int abi_ver;
 };
 
 struct i40iw_pd {