From: Vijay Kumar Srivastava <vsriv...@xilinx.com>
Add an API to query the virtqueue doorbell offset in the BAR for a VI.
For vDPA, the virtio net driver notifies the device directly by writing
doorbell. This API would be invoked from vDPA client driver.
Signed-off-by: Vijay Kumar Srivastava <vsriv...@xilinx.com>
Signed-off-by: Andrew Rybchenko <andrew.rybche...@oktetlabs.ru>
---
drivers/common/sfc_efx/base/efx.h | 12 +++
drivers/common/sfc_efx/base/efx_impl.h | 2 +
drivers/common/sfc_efx/base/efx_virtio.c | 41 ++++++++++
drivers/common/sfc_efx/base/rhead_impl.h | 6 ++
drivers/common/sfc_efx/base/rhead_virtio.c | 93 ++++++++++++++++++++++
drivers/common/sfc_efx/version.map | 1 +
6 files changed, 155 insertions(+)
diff --git a/drivers/common/sfc_efx/base/efx.h
b/drivers/common/sfc_efx/base/efx.h
index f9004ae2a4..733ef4a115 100644
--- a/drivers/common/sfc_efx/base/efx.h
+++ b/drivers/common/sfc_efx/base/efx.h
@@ -4475,6 +4475,18 @@ extern void
efx_virtio_qdestroy(
__in efx_virtio_vq_t *evvp);
+/*
+ * Get the offset in the BAR of the doorbells for a VI.
+ * net device : doorbell offset of RX & TX queues
+ * block device : request doorbell offset in the BAR.
+ * For further details refer section of 4 of SF-119689
+ */
+LIBEFX_API
+extern __checkReturn efx_rc_t
+efx_virtio_get_doorbell_offset(
+ __in efx_virtio_vq_t *evvp,
+ __out uint32_t *offsetp);
+
#endif /* EFSYS_OPT_VIRTIO */
#ifdef __cplusplus
diff --git a/drivers/common/sfc_efx/base/efx_impl.h
b/drivers/common/sfc_efx/base/efx_impl.h
index 374b14d253..dee9d936df 100644
--- a/drivers/common/sfc_efx/base/efx_impl.h
+++ b/drivers/common/sfc_efx/base/efx_impl.h
@@ -316,6 +316,8 @@ typedef struct efx_virtio_ops_s {
efx_virtio_vq_dyncfg_t *);
efx_rc_t (*evo_virtio_qstop)(efx_virtio_vq_t *,
efx_virtio_vq_dyncfg_t *);
+ efx_rc_t (*evo_get_doorbell_offset)(efx_virtio_vq_t *,
+ uint32_t *);
} efx_virtio_ops_t;
#endif /* EFSYS_OPT_VIRTIO */
diff --git a/drivers/common/sfc_efx/base/efx_virtio.c
b/drivers/common/sfc_efx/base/efx_virtio.c
index 1b7b01556e..de998fcad9 100644
--- a/drivers/common/sfc_efx/base/efx_virtio.c
+++ b/drivers/common/sfc_efx/base/efx_virtio.c
@@ -12,6 +12,7 @@
static const efx_virtio_ops_t __efx_virtio_rhead_ops = {
rhead_virtio_qstart, /* evo_virtio_qstart */
rhead_virtio_qstop, /* evo_virtio_qstop */
+ rhead_virtio_get_doorbell_offset, /* evo_get_doorbell_offset */
};
#endif /* EFSYS_OPT_RIVERHEAD */
@@ -213,4 +214,44 @@ efx_virtio_qdestroy(
}
}
+ __checkReturn efx_rc_t
+efx_virtio_get_doorbell_offset(
+ __in efx_virtio_vq_t *evvp,
+ __out uint32_t *offsetp)
+{
+ efx_nic_t *enp;
+ const efx_virtio_ops_t *evop;
+ efx_rc_t rc;
+
+ if ((evvp == NULL) || (offsetp == NULL)) {
+ rc = EINVAL;
+ goto fail1;
+ }
+
+ enp = evvp->evv_enp;
+ evop = enp->en_evop;
+
+ EFSYS_ASSERT3U(enp->en_magic, ==, EFX_NIC_MAGIC);
+ EFSYS_ASSERT3U(enp->en_mod_flags, &, EFX_MOD_VIRTIO);
+
+ if (evop == NULL) {
+ rc = ENOTSUP;
+ goto fail2;
+ }
+
+ if ((rc = evop->evo_get_doorbell_offset(evvp, offsetp)) != 0)
+ goto fail3;
+
+ return (0);
+
+fail3:
+ EFSYS_PROBE(fail3);
+fail2:
+ EFSYS_PROBE(fail2);
+fail1:
+ EFSYS_PROBE1(fail1, efx_rc_t, rc);
+
+ return (rc);
+}
+
#endif /* EFSYS_OPT_VIRTIO */
diff --git a/drivers/common/sfc_efx/base/rhead_impl.h
b/drivers/common/sfc_efx/base/rhead_impl.h
index e22c3e9b1a..4601e491fd 100644
--- a/drivers/common/sfc_efx/base/rhead_impl.h
+++ b/drivers/common/sfc_efx/base/rhead_impl.h
@@ -492,6 +492,12 @@ rhead_virtio_qstop(
__in efx_virtio_vq_t *evvp,
__out_opt efx_virtio_vq_dyncfg_t *evvdp);
+LIBEFX_INTERNAL
+extern __checkReturn efx_rc_t
+rhead_virtio_get_doorbell_offset(
+ __in efx_virtio_vq_t *evvp,
+ __out uint32_t *offsetp);
+
#endif /* EFSYS_OPT_VIRTIO */
#ifdef __cplusplus
diff --git a/drivers/common/sfc_efx/base/rhead_virtio.c
b/drivers/common/sfc_efx/base/rhead_virtio.c
index d1719f834e..147460c95c 100644
--- a/drivers/common/sfc_efx/base/rhead_virtio.c
+++ b/drivers/common/sfc_efx/base/rhead_virtio.c
@@ -187,4 +187,97 @@ rhead_virtio_qstop(
return (rc);
}
+ __checkReturn efx_rc_t
+rhead_virtio_get_doorbell_offset(
+ __in efx_virtio_vq_t *evvp,
+ __out uint32_t *offsetp)
+{
+ efx_nic_t *enp = evvp->evv_enp;
+ efx_mcdi_req_t req;
+ uint32_t type;
+ EFX_MCDI_DECLARE_BUF(payload, MC_CMD_VIRTIO_GET_DOORBELL_OFFSET_REQ_LEN,
+ MC_CMD_VIRTIO_GET_NET_DOORBELL_OFFSET_RESP_LEN);
+ efx_rc_t rc;
+
+ req.emr_cmd = MC_CMD_VIRTIO_GET_DOORBELL_OFFSET;
+ req.emr_in_buf = payload;
+ req.emr_in_length = MC_CMD_VIRTIO_GET_DOORBELL_OFFSET_REQ_LEN;
+ req.emr_out_buf = payload;
+ req.emr_out_length = MC_CMD_VIRTIO_GET_NET_DOORBELL_OFFSET_RESP_LEN;
+
+ switch (evvp->evv_type) {
+ case EFX_VIRTIO_VQ_TYPE_NET_RXQ:
+ case EFX_VIRTIO_VQ_TYPE_NET_TXQ:
+ type = MC_CMD_VIRTIO_GET_FEATURES_IN_NET;
+ break;
+ case EFX_VIRTIO_VQ_TYPE_BLOCK:
+ type = MC_CMD_VIRTIO_GET_FEATURES_IN_BLOCK;
+ break;
+ default:
+ rc = EINVAL;
+ goto fail1;
+ }
+
+ MCDI_IN_SET_BYTE(req, VIRTIO_GET_DOORBELL_OFFSET_REQ_DEVICE_ID,
+ type);
+ MCDI_IN_SET_WORD(req, VIRTIO_GET_DOORBELL_OFFSET_REQ_TARGET_VF,
+ evvp->evv_target_vf);
+ MCDI_IN_SET_DWORD(req, VIRTIO_GET_DOORBELL_OFFSET_REQ_INSTANCE,
+ evvp->evv_vi_index);
+
+ efx_mcdi_execute(enp, &req);
+
+ if (req.emr_rc != 0) {
+ rc = req.emr_rc;
+ goto fail2;
+ }
+
+ switch (type) {
+ case MC_CMD_VIRTIO_GET_FEATURES_IN_NET:
+ if (req.emr_out_length_used <
+ MC_CMD_VIRTIO_GET_NET_DOORBELL_OFFSET_RESP_LEN) {
+ rc = EMSGSIZE;
+ goto fail3;
+ }
+
+ if (evvp->evv_type == EFX_VIRTIO_VQ_TYPE_NET_RXQ) {
+ *offsetp = MCDI_OUT_DWORD(req,
+ VIRTIO_GET_NET_DOORBELL_OFFSET_RESP_RX_DBL_OFFSET);
+ } else if (evvp->evv_type == EFX_VIRTIO_VQ_TYPE_NET_TXQ) {
+ *offsetp = MCDI_OUT_DWORD(req,
+ VIRTIO_GET_NET_DOORBELL_OFFSET_RESP_TX_DBL_OFFSET);
+ }
+ break;
+ case MC_CMD_VIRTIO_GET_FEATURES_IN_BLOCK:
+ if (req.emr_out_length_used <
+ MC_CMD_VIRTIO_GET_BLOCK_DOORBELL_OFFSET_RESP_LEN) {
+ rc = EMSGSIZE;
+ goto fail4;
+ }
+
+ *offsetp = MCDI_OUT_DWORD(req,
+ VIRTIO_GET_BLOCK_DOORBELL_OFFSET_RESP_DBL_OFFSET);
+ break;
+ default:
+ EFSYS_ASSERT(0);
+ rc = EINVAL;
+ goto fail5;
+ }
+
+ return (0);
+
+fail5:
+ EFSYS_PROBE(fail5);
+fail4:
+ EFSYS_PROBE(fail4);
+fail3:
+ EFSYS_PROBE(fail3);
+fail2:
+ EFSYS_PROBE(fail2);
+fail1:
+ EFSYS_PROBE1(fail1, efx_rc_t, rc);
+
+ return (rc);
+}
+
#endif /* EFSYS_OPT_RIVERHEAD && EFSYS_OPT_VIRTIO */
diff --git a/drivers/common/sfc_efx/version.map
b/drivers/common/sfc_efx/version.map
index b4da2ee5e6..0e41fd84fe 100644
--- a/drivers/common/sfc_efx/version.map
+++ b/drivers/common/sfc_efx/version.map
@@ -222,6 +222,7 @@ INTERNAL {
efx_txq_size;
efx_virtio_fini;
+ efx_virtio_get_doorbell_offset;
efx_virtio_init;
efx_virtio_qcreate;
efx_virtio_qdestroy;
--
2.30.1
