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, 122 insertions, 0 deletions

diff --git a/drivers/net/ethernet/qlogic/qed/qed_vf.c b/drivers/net/ethernet/qlogic/qed/qed_vf.c
index 961de771392c..05b3ccadbcea 100644
--- a/drivers/net/ethernet/qlogic/qed/qed_vf.c
+++ b/drivers/net/ethernet/qlogic/qed/qed_vf.c
@@ -6,6 +6,7 @@
  * this source tree.
  */
 
+#include <linux/crc32.h>
 #include "qed.h"
 #include "qed_sriov.h"
 #include "qed_vf.h"
@@ -865,6 +866,103 @@ u16 qed_vf_get_igu_sb_id(struct qed_hwfn *p_hwfn, u16 sb_id)
 	return p_iov->acquire_resp.resc.hw_sbs[sb_id].hw_sb_id;
 }
 
+int qed_vf_read_bulletin(struct qed_hwfn *p_hwfn, u8 *p_change)
+{
+	struct qed_vf_iov *p_iov = p_hwfn->vf_iov_info;
+	struct qed_bulletin_content shadow;
+	u32 crc, crc_size;
+
+	crc_size = sizeof(p_iov->bulletin.p_virt->crc);
+	*p_change = 0;
+
+	/* Need to guarantee PF is not in the middle of writing it */
+	memcpy(&shadow, p_iov->bulletin.p_virt, p_iov->bulletin.size);
+
+	/* If version did not update, no need to do anything */
+	if (shadow.version == p_iov->bulletin_shadow.version)
+		return 0;
+
+	/* Verify the bulletin we see is valid */
+	crc = crc32(0, (u8 *)&shadow + crc_size,
+		    p_iov->bulletin.size - crc_size);
+	if (crc != shadow.crc)
+		return -EAGAIN;
+
+	/* Set the shadow bulletin and process it */
+	memcpy(&p_iov->bulletin_shadow, &shadow, p_iov->bulletin.size);
+
+	DP_VERBOSE(p_hwfn, QED_MSG_IOV,
+		   "Read a bulletin update %08x\n", shadow.version);
+
+	*p_change = 1;
+
+	return 0;
+}
+
+void __qed_vf_get_link_params(struct qed_hwfn *p_hwfn,
+			      struct qed_mcp_link_params *p_params,
+			      struct qed_bulletin_content *p_bulletin)
+{
+	memset(p_params, 0, sizeof(*p_params));
+
+	p_params->speed.autoneg = p_bulletin->req_autoneg;
+	p_params->speed.advertised_speeds = p_bulletin->req_adv_speed;
+	p_params->speed.forced_speed = p_bulletin->req_forced_speed;
+	p_params->pause.autoneg = p_bulletin->req_autoneg_pause;
+	p_params->pause.forced_rx = p_bulletin->req_forced_rx;
+	p_params->pause.forced_tx = p_bulletin->req_forced_tx;
+	p_params->loopback_mode = p_bulletin->req_loopback;
+}
+
+void qed_vf_get_link_params(struct qed_hwfn *p_hwfn,
+			    struct qed_mcp_link_params *params)
+{
+	__qed_vf_get_link_params(p_hwfn, params,
+				 &(p_hwfn->vf_iov_info->bulletin_shadow));
+}
+
+void __qed_vf_get_link_state(struct qed_hwfn *p_hwfn,
+			     struct qed_mcp_link_state *p_link,
+			     struct qed_bulletin_content *p_bulletin)
+{
+	memset(p_link, 0, sizeof(*p_link));
+
+	p_link->link_up = p_bulletin->link_up;
+	p_link->speed = p_bulletin->speed;
+	p_link->full_duplex = p_bulletin->full_duplex;
+	p_link->an = p_bulletin->autoneg;
+	p_link->an_complete = p_bulletin->autoneg_complete;
+	p_link->parallel_detection = p_bulletin->parallel_detection;
+	p_link->pfc_enabled = p_bulletin->pfc_enabled;
+	p_link->partner_adv_speed = p_bulletin->partner_adv_speed;
+	p_link->partner_tx_flow_ctrl_en = p_bulletin->partner_tx_flow_ctrl_en;
+	p_link->partner_rx_flow_ctrl_en = p_bulletin->partner_rx_flow_ctrl_en;
+	p_link->partner_adv_pause = p_bulletin->partner_adv_pause;
+	p_link->sfp_tx_fault = p_bulletin->sfp_tx_fault;
+}
+
+void qed_vf_get_link_state(struct qed_hwfn *p_hwfn,
+			   struct qed_mcp_link_state *link)
+{
+	__qed_vf_get_link_state(p_hwfn, link,
+				&(p_hwfn->vf_iov_info->bulletin_shadow));
+}
+
+void __qed_vf_get_link_caps(struct qed_hwfn *p_hwfn,
+			    struct qed_mcp_link_capabilities *p_link_caps,
+			    struct qed_bulletin_content *p_bulletin)
+{
+	memset(p_link_caps, 0, sizeof(*p_link_caps));
+	p_link_caps->speed_capabilities = p_bulletin->capability_speed;
+}
+
+void qed_vf_get_link_caps(struct qed_hwfn *p_hwfn,
+			  struct qed_mcp_link_capabilities *p_link_caps)
+{
+	__qed_vf_get_link_caps(p_hwfn, p_link_caps,
+			       &(p_hwfn->vf_iov_info->bulletin_shadow));
+}
+
 void qed_vf_get_num_rxqs(struct qed_hwfn *p_hwfn, u8 *num_rxqs)
 {
 	*num_rxqs = p_hwfn->vf_iov_info->acquire_resp.resc.num_rxqs;
@@ -897,3 +995,27 @@ void qed_vf_get_fw_version(struct qed_hwfn *p_hwfn,
 	*fw_rev = info->fw_rev;
 	*fw_eng = info->fw_eng;
 }
+
+static void qed_handle_bulletin_change(struct qed_hwfn *hwfn)
+{
+	/* Always update link configuration according to bulletin */
+	qed_link_update(hwfn);
+}
+
+void qed_iov_vf_task(struct work_struct *work)
+{
+	struct qed_hwfn *hwfn = container_of(work, struct qed_hwfn,
+					     iov_task.work);
+	u8 change = 0;
+
+	if (test_and_clear_bit(QED_IOV_WQ_STOP_WQ_FLAG, &hwfn->iov_task_flags))
+		return;
+
+	/* Handle bulletin board changes */
+	qed_vf_read_bulletin(hwfn, &change);
+	if (change)
+		qed_handle_bulletin_change(hwfn);
+
+	/* As VF is polling bulletin board, need to constantly re-schedule */
+	queue_delayed_work(hwfn->iov_wq, &hwfn->iov_task, HZ);
+}