qed: VF XDP support

The final addition on the qed front -
 - VFs would now require their PFs to provide multiple CIDs
 - Based on the availability of connections from PF, determine whether
   XDP is feasible and share it with qede via dev_info.

Signed-off-by: Yuval Mintz <Yuval.Mintz@cavium.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/qlogic/qed/qed_l2.c

@@ -2119,15 +2119,26 @@ static int qed_fill_eth_dev_info(struct qed_dev *cdev,
 
 		ether_addr_copy(info->port_mac,
 				cdev->hwfns[0].hw_info.hw_mac_addr);
+
+		info->xdp_supported = true;
 	} else {
-		qed_vf_get_num_rxqs(QED_LEADING_HWFN(cdev), &info->num_queues);
-		if (cdev->num_hwfns > 1) {
-			u8 queues = 0;
+		u16 total_cids = 0;
+
+		/* Determine queues &  XDP support */
+		for_each_hwfn(cdev, i) {
+			struct qed_hwfn *p_hwfn = &cdev->hwfns[i];
+			u8 queues, cids;
 
-			qed_vf_get_num_rxqs(&cdev->hwfns[1], &queues);
+			qed_vf_get_num_cids(p_hwfn, &cids);
+			qed_vf_get_num_rxqs(p_hwfn, &queues);
 			info->num_queues += queues;
+			total_cids += cids;
 		}
 
+		/* Enable VF XDP in case PF guarntees sufficient connections */
+		if (total_cids >= info->num_queues * 3)
+			info->xdp_supported = true;
+
 		qed_vf_get_num_vlan_filters(&cdev->hwfns[0],
 					    (u8 *)&info->num_vlan_filters);
 		qed_vf_get_num_mac_filters(&cdev->hwfns[0],

drivers/net/ethernet/qlogic/qed/qed_vf.c

@@ -291,9 +291,11 @@ static int qed_vf_pf_acquire(struct qed_hwfn *p_hwfn)
 	req->vfdev_info.capabilities |= VFPF_ACQUIRE_CAP_100G;
 
 	/* If we've mapped the doorbell bar, try using queue qids */
-	if (p_iov->b_doorbell_bar)
+	if (p_iov->b_doorbell_bar) {
 		req->vfdev_info.capabilities |= VFPF_ACQUIRE_CAP_PHYSICAL_BAR |
 						VFPF_ACQUIRE_CAP_QUEUE_QIDS;
+		p_resc->num_cids = QED_ETH_VF_MAX_NUM_CIDS;
+	}
 
 	/* pf 2 vf bulletin board address */
 	req->bulletin_addr = p_iov->bulletin.phys;
@@ -884,8 +886,8 @@ qed_vf_pf_txq_start(struct qed_hwfn *p_hwfn,
 	}
 
 	DP_VERBOSE(p_hwfn, QED_MSG_IOV,
-		   "Txq[0x%02x]: doorbell at %p [offset 0x%08x]\n",
-		   qid, *pp_doorbell, resp->offset);
+		   "Txq[0x%02x.%02x]: doorbell at %p [offset 0x%08x]\n",
+		   qid, p_cid->qid_usage_idx, *pp_doorbell, resp->offset);
 exit:
 	qed_vf_pf_req_end(p_hwfn, rc);
 
@@ -1478,6 +1480,11 @@ void qed_vf_get_num_txqs(struct qed_hwfn *p_hwfn, u8 *num_txqs)
 	*num_txqs = p_hwfn->vf_iov_info->acquire_resp.resc.num_txqs;
 }
 
+void qed_vf_get_num_cids(struct qed_hwfn *p_hwfn, u8 *num_cids)
+{
+	*num_cids = p_hwfn->vf_iov_info->acquire_resp.resc.num_cids;
+}
+
 void qed_vf_get_port_mac(struct qed_hwfn *p_hwfn, u8 *port_mac)
 {
 	memcpy(port_mac,

drivers/net/ethernet/qlogic/qed/qed_vf.h

@@ -731,6 +731,14 @@ void qed_vf_get_num_rxqs(struct qed_hwfn *p_hwfn, u8 *num_rxqs);
  */
 void qed_vf_get_num_txqs(struct qed_hwfn *p_hwfn, u8 *num_txqs);
 
+/**
+ * @brief Get number of available connections [both Rx and Tx] for VF
+ *
+ * @param p_hwfn
+ * @param num_cids - allocated number of connections
+ */
+void qed_vf_get_num_cids(struct qed_hwfn *p_hwfn, u8 *num_cids);
+
 /**
  * @brief Get port mac address for VF
  *
@@ -1010,6 +1018,10 @@ static inline void qed_vf_get_num_txqs(struct qed_hwfn *p_hwfn, u8 *num_txqs)
 {
 }
 
+static inline void qed_vf_get_num_cids(struct qed_hwfn *p_hwfn, u8 *num_cids)
+{
+}
+
 static inline void qed_vf_get_port_mac(struct qed_hwfn *p_hwfn, u8 *port_mac)
 {
 }

include/linux/qed/qed_eth_if.h

@@ -73,6 +73,9 @@ struct qed_dev_eth_info {
 
 	/* Legacy VF - this affects the datapath, so qede has to know */
 	bool is_legacy;
+
+	/* Might depend on available resources [in case of VF] */
+	bool xdp_supported;
 };
 
 struct qed_update_vport_rss_params {