qed: Bulletin and Link

Up to this point, VF and PF communication always originates from VF.
As a result, VF cannot be notified of any async changes, and specifically
cannot be informed of the current link state.

This introduces the bulletin board, the mechanism through which the PF
is going to communicate async notifications back to the VF. basically,
it's a well-defined structure agreed by both PF and VF which the VF would
continuously poll and into which the PF would DMA messages when needed.
[Bulletin board is actually allocated and communicated in previous patches
but never before used]

Based on the bulletin infrastructure, the VF can query its link status
and receive said async carrier changes.

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

1 files changed, 133 insertions, 3 deletions

diff --git a/drivers/net/ethernet/qlogic/qed/qed_sriov.c b/drivers/net/ethernet/qlogic/qed/qed_sriov.c
index 82f1eda38962..f6540c0ae595 100644
--- a/drivers/net/ethernet/qlogic/qed/qed_sriov.c
+++ b/drivers/net/ethernet/qlogic/qed/qed_sriov.c
@@ -7,6 +7,7 @@
  */
 
 #include <linux/etherdevice.h>
+#include <linux/crc32.h>
 #include <linux/qed/qed_iov_if.h>
 #include "qed_cxt.h"
 #include "qed_hsi.h"
@@ -116,6 +117,41 @@ static struct qed_vf_info *qed_iov_get_vf_info(struct qed_hwfn *p_hwfn,
 	return vf;
 }
 
+int qed_iov_post_vf_bulletin(struct qed_hwfn *p_hwfn,
+			     int vfid, struct qed_ptt *p_ptt)
+{
+	struct qed_bulletin_content *p_bulletin;
+	int crc_size = sizeof(p_bulletin->crc);
+	struct qed_dmae_params params;
+	struct qed_vf_info *p_vf;
+
+	p_vf = qed_iov_get_vf_info(p_hwfn, (u16) vfid, true);
+	if (!p_vf)
+		return -EINVAL;
+
+	if (!p_vf->vf_bulletin)
+		return -EINVAL;
+
+	p_bulletin = p_vf->bulletin.p_virt;
+
+	/* Increment bulletin board version and compute crc */
+	p_bulletin->version++;
+	p_bulletin->crc = crc32(0, (u8 *)p_bulletin + crc_size,
+				p_vf->bulletin.size - crc_size);
+
+	DP_VERBOSE(p_hwfn, QED_MSG_IOV,
+		   "Posting Bulletin 0x%08x to VF[%d] (CRC 0x%08x)\n",
+		   p_bulletin->version, p_vf->relative_vf_id, p_bulletin->crc);
+
+	/* propagate bulletin board via dmae to vm memory */
+	memset(&params, 0, sizeof(params));
+	params.flags = QED_DMAE_FLAG_VF_DST;
+	params.dst_vfid = p_vf->abs_vf_id;
+	return qed_dmae_host2host(p_hwfn, p_ptt, p_vf->bulletin.phys,
+				  p_vf->vf_bulletin, p_vf->bulletin.size / 4,
+				  &params);
+}
+
 static int qed_iov_pci_cfg_info(struct qed_dev *cdev)
 {
 	struct qed_hw_sriov_info *iov = cdev->p_iov_info;
@@ -790,6 +826,11 @@ static int qed_iov_release_hw_for_vf(struct qed_hwfn *p_hwfn,
 		return -EINVAL;
 	}
 
+	if (vf->bulletin.p_virt)
+		memset(vf->bulletin.p_virt, 0, sizeof(*vf->bulletin.p_virt));
+
+	memset(&vf->p_vf_info, 0, sizeof(vf->p_vf_info));
+
 	if (vf->state != VF_STOPPED) {
 		/* Stopping the VF */
 		rc = qed_sp_vf_stop(p_hwfn, vf->concrete_fid, vf->opaque_fid);
@@ -1159,6 +1200,7 @@ static void qed_iov_vf_mbx_acquire(struct qed_hwfn *p_hwfn,
 
 	/* Fill agreed size of bulletin board in response */
 	resp->bulletin_size = vf->bulletin.size;
+	qed_iov_post_vf_bulletin(p_hwfn, vf->relative_vf_id, p_ptt);
 
 	DP_VERBOSE(p_hwfn,
 		   QED_MSG_IOV,
@@ -2019,6 +2061,45 @@ int qed_iov_mark_vf_flr(struct qed_hwfn *p_hwfn, u32 *p_disabled_vfs)
 	return found;
 }
 
+void qed_iov_set_link(struct qed_hwfn *p_hwfn,
+		      u16 vfid,
+		      struct qed_mcp_link_params *params,
+		      struct qed_mcp_link_state *link,
+		      struct qed_mcp_link_capabilities *p_caps)
+{
+	struct qed_vf_info *p_vf = qed_iov_get_vf_info(p_hwfn,
+						       vfid,
+						       false);
+	struct qed_bulletin_content *p_bulletin;
+
+	if (!p_vf)
+		return;
+
+	p_bulletin = p_vf->bulletin.p_virt;
+	p_bulletin->req_autoneg = params->speed.autoneg;
+	p_bulletin->req_adv_speed = params->speed.advertised_speeds;
+	p_bulletin->req_forced_speed = params->speed.forced_speed;
+	p_bulletin->req_autoneg_pause = params->pause.autoneg;
+	p_bulletin->req_forced_rx = params->pause.forced_rx;
+	p_bulletin->req_forced_tx = params->pause.forced_tx;
+	p_bulletin->req_loopback = params->loopback_mode;
+
+	p_bulletin->link_up = link->link_up;
+	p_bulletin->speed = link->speed;
+	p_bulletin->full_duplex = link->full_duplex;
+	p_bulletin->autoneg = link->an;
+	p_bulletin->autoneg_complete = link->an_complete;
+	p_bulletin->parallel_detection = link->parallel_detection;
+	p_bulletin->pfc_enabled = link->pfc_enabled;
+	p_bulletin->partner_adv_speed = link->partner_adv_speed;
+	p_bulletin->partner_tx_flow_ctrl_en = link->partner_tx_flow_ctrl_en;
+	p_bulletin->partner_rx_flow_ctrl_en = link->partner_rx_flow_ctrl_en;
+	p_bulletin->partner_adv_pause = link->partner_adv_pause;
+	p_bulletin->sfp_tx_fault = link->sfp_tx_fault;
+
+	p_bulletin->capability_speed = p_caps->speed_capabilities;
+}
+
 static void qed_iov_process_mbx_req(struct qed_hwfn *p_hwfn,
 				    struct qed_ptt *p_ptt, int vfid)
 {
@@ -2359,6 +2440,29 @@ static int qed_sriov_configure(struct qed_dev *cdev, int num_vfs_param)
 		return qed_sriov_disable(cdev, true);
 }
 
+void qed_inform_vf_link_state(struct qed_hwfn *hwfn)
+{
+	struct qed_mcp_link_capabilities caps;
+	struct qed_mcp_link_params params;
+	struct qed_mcp_link_state link;
+	int i;
+
+	if (!hwfn->pf_iov_info)
+		return;
+
+	/* Update bulletin of all future possible VFs with link configuration */
+	for (i = 0; i < hwfn->cdev->p_iov_info->total_vfs; i++) {
+		memcpy(&params, qed_mcp_get_link_params(hwfn), sizeof(params));
+		memcpy(&link, qed_mcp_get_link_state(hwfn), sizeof(link));
+		memcpy(&caps, qed_mcp_get_link_capabilities(hwfn),
+		       sizeof(caps));
+
+		qed_iov_set_link(hwfn, i, &params, &link, &caps);
+	}
+
+	qed_schedule_iov(hwfn, QED_IOV_WQ_BULLETIN_UPDATE_FLAG);
+}
+
 static void qed_handle_vf_msg(struct qed_hwfn *hwfn)
 {
 	u64 events[QED_VF_ARRAY_LENGTH];
@@ -2398,6 +2502,24 @@ static void qed_handle_vf_msg(struct qed_hwfn *hwfn)
 	qed_ptt_release(hwfn, ptt);
 }
 
+static void qed_handle_bulletin_post(struct qed_hwfn *hwfn)
+{
+	struct qed_ptt *ptt;
+	int i;
+
+	ptt = qed_ptt_acquire(hwfn);
+	if (!ptt) {
+		DP_NOTICE(hwfn, "Failed allocating a ptt entry\n");
+		qed_schedule_iov(hwfn, QED_IOV_WQ_BULLETIN_UPDATE_FLAG);
+		return;
+	}
+
+	qed_for_each_vf(hwfn, i)
+	    qed_iov_post_vf_bulletin(hwfn, i, ptt);
+
+	qed_ptt_release(hwfn, ptt);
+}
+
 void qed_iov_pf_task(struct work_struct *work)
 {
 	struct qed_hwfn *hwfn = container_of(work, struct qed_hwfn,
@@ -2424,6 +2546,9 @@ void qed_iov_pf_task(struct work_struct *work)
 
 	if (test_and_clear_bit(QED_IOV_WQ_MSG_FLAG, &hwfn->iov_task_flags))
 		qed_handle_vf_msg(hwfn);
+	if (test_and_clear_bit(QED_IOV_WQ_BULLETIN_UPDATE_FLAG,
+			       &hwfn->iov_task_flags))
+		qed_handle_bulletin_post(hwfn);
 }
 
 void qed_iov_wq_stop(struct qed_dev *cdev, bool schedule_first)
@@ -2453,8 +2578,10 @@ int qed_iov_wq_start(struct qed_dev *cdev)
 	for_each_hwfn(cdev, i) {
 		struct qed_hwfn *p_hwfn = &cdev->hwfns[i];
 
-		/* PFs needs a dedicated workqueue only if they support IOV. */
-		if (!IS_PF_SRIOV(p_hwfn))
+		/* PFs needs a dedicated workqueue only if they support IOV.
+		 * VFs always require one.
+		 */
+		if (IS_PF(p_hwfn->cdev) && !IS_PF_SRIOV(p_hwfn))
 			continue;
 
 		snprintf(name, NAME_SIZE, "iov-%02x:%02x.%02x",
@@ -2467,7 +2594,10 @@ int qed_iov_wq_start(struct qed_dev *cdev)
 			return -ENOMEM;
 		}
 
-		INIT_DELAYED_WORK(&p_hwfn->iov_task, qed_iov_pf_task);
+		if (IS_PF(cdev))
+			INIT_DELAYED_WORK(&p_hwfn->iov_task, qed_iov_pf_task);
+		else
+			INIT_DELAYED_WORK(&p_hwfn->iov_task, qed_iov_vf_task);
 	}
 
 	return 0;