RDMA/core: Get xmit slave for LAG

Add a call to rdma_lag_get_ah_roce_slave() when the address handle is
created. Lower driver can use it to select the QP's affinity port.

Link: https://lore.kernel.org/r/20200430192146.12863-15-maorg@mellanox.comSigned-off-by: Maor Gottlieb <maorg@mellanox.com>
Reviewed-by: Leon Romanovsky <leonro@mellanox.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>

drivers/infiniband/core/verbs.c

@@ -50,6 +50,7 @@
 #include <rdma/ib_cache.h>
 #include <rdma/ib_addr.h>
 #include <rdma/rw.h>
+#include <rdma/lag.h>
 
 #include "core_priv.h"
 #include <trace/events/rdma_core.h>
@@ -500,7 +501,8 @@ rdma_update_sgid_attr(struct rdma_ah_attr *ah_attr,
 static struct ib_ah *_rdma_create_ah(struct ib_pd *pd,
 				     struct rdma_ah_attr *ah_attr,
 				     u32 flags,
-				     struct ib_udata *udata)
+				     struct ib_udata *udata,
+				     struct net_device *xmit_slave)
 {
 	struct rdma_ah_init_attr init_attr = {};
 	struct ib_device *device = pd->device;
@@ -524,6 +526,7 @@ static struct ib_ah *_rdma_create_ah(struct ib_pd *pd,
 	ah->sgid_attr = rdma_update_sgid_attr(ah_attr, NULL);
 	init_attr.ah_attr = ah_attr;
 	init_attr.flags = flags;
+	init_attr.xmit_slave = xmit_slave;
 
 	ret = device->ops.create_ah(ah, &init_attr, udata);
 	if (ret) {
@@ -550,15 +553,22 @@ struct ib_ah *rdma_create_ah(struct ib_pd *pd, struct rdma_ah_attr *ah_attr,
 			     u32 flags)
 {
 	const struct ib_gid_attr *old_sgid_attr;
+	struct net_device *slave;
 	struct ib_ah *ah;
 	int ret;
 
 	ret = rdma_fill_sgid_attr(pd->device, ah_attr, &old_sgid_attr);
 	if (ret)
 		return ERR_PTR(ret);
-
-	ah = _rdma_create_ah(pd, ah_attr, flags, NULL);
-
+	slave = rdma_lag_get_ah_roce_slave(pd->device, ah_attr,
+					   (flags & RDMA_CREATE_AH_SLEEPABLE) ?
+					   GFP_KERNEL : GFP_ATOMIC);
+	if (IS_ERR(slave)) {
+		rdma_unfill_sgid_attr(ah_attr, old_sgid_attr);
+		return (void *)slave;
+	}
+	ah = _rdma_create_ah(pd, ah_attr, flags, NULL, slave);
+	rdma_lag_put_ah_roce_slave(slave);
 	rdma_unfill_sgid_attr(ah_attr, old_sgid_attr);
 	return ah;
 }
@@ -597,7 +607,8 @@ struct ib_ah *rdma_create_user_ah(struct ib_pd *pd,
 		}
 	}
 
-	ah = _rdma_create_ah(pd, ah_attr, RDMA_CREATE_AH_SLEEPABLE, udata);
+	ah = _rdma_create_ah(pd, ah_attr, RDMA_CREATE_AH_SLEEPABLE,
+			     udata, NULL);
 
 out:
 	rdma_unfill_sgid_attr(ah_attr, old_sgid_attr);
@@ -1636,11 +1647,35 @@ static int _ib_modify_qp(struct ib_qp *qp, struct ib_qp_attr *attr,
 	const struct ib_gid_attr *old_sgid_attr_alt_av;
 	int ret;
 
+	attr->xmit_slave = NULL;
 	if (attr_mask & IB_QP_AV) {
 		ret = rdma_fill_sgid_attr(qp->device, &attr->ah_attr,
 					  &old_sgid_attr_av);
 		if (ret)
 			return ret;
+
+		if (attr->ah_attr.type == RDMA_AH_ATTR_TYPE_ROCE &&
+		    is_qp_type_connected(qp)) {
+			struct net_device *slave;
+
+			/*
+			 * If the user provided the qp_attr then we have to
+			 * resolve it. Kerne users have to provide already
+			 * resolved rdma_ah_attr's.
+			 */
+			if (udata) {
+				ret = ib_resolve_eth_dmac(qp->device,
+							  &attr->ah_attr);
+				if (ret)
+					goto out_av;
+			}
+			slave = rdma_lag_get_ah_roce_slave(qp->device,
+							   &attr->ah_attr,
+							   GFP_KERNEL);
+			if (IS_ERR(slave))
+				goto out_av;
+			attr->xmit_slave = slave;
+		}
 	}
 	if (attr_mask & IB_QP_ALT_PATH) {
 		/*
@@ -1667,18 +1702,6 @@ static int _ib_modify_qp(struct ib_qp *qp, struct ib_qp_attr *attr,
 		}
 	}
 
-	/*
-	 * If the user provided the qp_attr then we have to resolve it. Kernel
-	 * users have to provide already resolved rdma_ah_attr's
-	 */
-	if (udata && (attr_mask & IB_QP_AV) &&
-	    attr->ah_attr.type == RDMA_AH_ATTR_TYPE_ROCE &&
-	    is_qp_type_connected(qp)) {
-		ret = ib_resolve_eth_dmac(qp->device, &attr->ah_attr);
-		if (ret)
-			goto out;
-	}
-
 	if (rdma_ib_or_roce(qp->device, port)) {
 		if (attr_mask & IB_QP_RQ_PSN && attr->rq_psn & ~0xffffff) {
 			dev_warn(&qp->device->dev,
@@ -1720,8 +1743,10 @@ static int _ib_modify_qp(struct ib_qp *qp, struct ib_qp_attr *attr,
 	if (attr_mask & IB_QP_ALT_PATH)
 		rdma_unfill_sgid_attr(&attr->alt_ah_attr, old_sgid_attr_alt_av);
 out_av:
-	if (attr_mask & IB_QP_AV)
+	if (attr_mask & IB_QP_AV) {
+		rdma_lag_put_ah_roce_slave(attr->xmit_slave);
 		rdma_unfill_sgid_attr(&attr->ah_attr, old_sgid_attr_av);
+	}
 	return ret;
 }
 

include/rdma/ib_verbs.h

@@ -883,6 +883,7 @@ __attribute_const__ enum ib_rate mult_to_ib_rate(int mult);
 struct rdma_ah_init_attr {
 	struct rdma_ah_attr *ah_attr;
 	u32 flags;
+	struct net_device *xmit_slave;
 };
 
 enum rdma_ah_attr_type {
@@ -1272,6 +1273,7 @@ struct ib_qp_attr {
 	u8			alt_port_num;
 	u8			alt_timeout;
 	u32			rate_limit;
+	struct net_device	*xmit_slave;
 };
 
 enum ib_wr_opcode {