common/sfc_efx/base: support getting virtio features

Add an API to get virtio features supported by device.

Signed-off-by: Vijay Kumar Srivastava <vsrivast@xilinx.com>
Signed-off-by: Andrew Rybchenko <andrew.rybchenko@oktetlabs.ru>

diff --git a/drivers/common/sfc_efx/base/efx.h b/drivers/common/sfc_efx/base/efx.h
index d4b7d7f..e3ac51e 100644 (file)
--- a/drivers/common/sfc_efx/base/efx.h
+++ b/drivers/common/sfc_efx/base/efx.h
@@ -4433,6 +4433,13 @@ typedef struct efx_virtio_vq_cfg_s {
 
 typedef struct efx_virtio_vq_s efx_virtio_vq_t;
 
+typedef enum efx_virtio_device_type_e {
+       EFX_VIRTIO_DEVICE_TYPE_RESERVED,
+       EFX_VIRTIO_DEVICE_TYPE_NET,
+       EFX_VIRTIO_DEVICE_TYPE_BLOCK,
+       EFX_VIRTIO_DEVICE_NTYPES
+} efx_virtio_device_type_t;
+
 LIBEFX_API
 extern __checkReturn   efx_rc_t
 efx_virtio_init(
@@ -4487,6 +4494,13 @@ efx_virtio_get_doorbell_offset(
        __in            efx_virtio_vq_t *evvp,
        __out           uint32_t *offsetp);
 
+LIBEFX_API
+extern __checkReturn   efx_rc_t
+efx_virtio_get_features(
+       __in            efx_nic_t *enp,
+       __in            efx_virtio_device_type_t type,
+       __out           uint64_t *featuresp);
+
 #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 d6742f4..758206d 100644 (file)
--- a/drivers/common/sfc_efx/base/efx_impl.h
+++ b/drivers/common/sfc_efx/base/efx_impl.h
@@ -318,6 +318,8 @@ typedef struct efx_virtio_ops_s {
                                efx_virtio_vq_dyncfg_t *);
        efx_rc_t        (*evo_get_doorbell_offset)(efx_virtio_vq_t *,
                                uint32_t *);
+       efx_rc_t        (*evo_get_features)(efx_nic_t *,
+                               efx_virtio_device_type_t, uint64_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 7303c00..925dcc3 100644 (file)
--- a/drivers/common/sfc_efx/base/efx_virtio.c
+++ b/drivers/common/sfc_efx/base/efx_virtio.c
@@ -13,6 +13,7 @@ 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 */
+       rhead_virtio_get_features,              /* evo_get_features */
 };
 #endif /* EFSYS_OPT_RIVERHEAD */
 
@@ -254,4 +255,48 @@ fail1:
        return (rc);
 }
 
+       __checkReturn   efx_rc_t
+efx_virtio_get_features(
+       __in            efx_nic_t *enp,
+       __in            efx_virtio_device_type_t type,
+       __out           uint64_t *featuresp)
+{
+       const efx_virtio_ops_t *evop = enp->en_evop;
+       efx_rc_t rc;
+
+       if (featuresp == NULL) {
+               rc = EINVAL;
+               goto fail1;
+       }
+
+       if (type >= EFX_VIRTIO_DEVICE_NTYPES) {
+               rc = EINVAL;
+               goto fail2;
+       }
+
+       EFSYS_ASSERT3U(enp->en_magic, ==, EFX_NIC_MAGIC);
+       EFSYS_ASSERT3U(enp->en_mod_flags, &, EFX_MOD_VIRTIO);
+
+       if (evop == NULL) {
+               rc = ENOTSUP;
+               goto fail3;
+       }
+
+       if ((rc = evop->evo_get_features(enp, type, featuresp)) != 0)
+               goto fail4;
+
+       return (0);
+
+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_VIRTIO */

diff --git a/drivers/common/sfc_efx/base/rhead_impl.h b/drivers/common/sfc_efx/base/rhead_impl.h
index 4304f63..69d701a 100644 (file)
--- a/drivers/common/sfc_efx/base/rhead_impl.h
+++ b/drivers/common/sfc_efx/base/rhead_impl.h
@@ -498,6 +498,13 @@ rhead_virtio_get_doorbell_offset(
        __in                            efx_virtio_vq_t *evvp,
        __out                           uint32_t *offsetp);
 
+LIBEFX_INTERNAL
+extern __checkReturn                   efx_rc_t
+rhead_virtio_get_features(
+       __in                            efx_nic_t *enp,
+       __in                            efx_virtio_device_type_t type,
+       __out                           uint64_t *featuresp);
+
 #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 e696713..c49ac10 100644 (file)
--- a/drivers/common/sfc_efx/base/rhead_virtio.c
+++ b/drivers/common/sfc_efx/base/rhead_virtio.c
@@ -280,4 +280,56 @@ fail1:
        return (rc);
 }
 
+       __checkReturn   efx_rc_t
+rhead_virtio_get_features(
+       __in            efx_nic_t *enp,
+       __in            efx_virtio_device_type_t type,
+       __out           uint64_t *featuresp)
+{
+       efx_mcdi_req_t req;
+       uint32_t features_lo;
+       uint32_t features_hi;
+       EFX_MCDI_DECLARE_BUF(payload, MC_CMD_VIRTIO_GET_FEATURES_IN_LEN,
+               MC_CMD_VIRTIO_GET_FEATURES_OUT_LEN);
+       efx_rc_t rc;
+
+       EFX_STATIC_ASSERT(EFX_VIRTIO_DEVICE_TYPE_NET ==
+               MC_CMD_VIRTIO_GET_FEATURES_IN_NET);
+       EFX_STATIC_ASSERT(EFX_VIRTIO_DEVICE_TYPE_BLOCK ==
+               MC_CMD_VIRTIO_GET_FEATURES_IN_BLOCK);
+
+       req.emr_cmd = MC_CMD_VIRTIO_GET_FEATURES;
+       req.emr_in_buf = payload;
+       req.emr_in_length = MC_CMD_VIRTIO_GET_FEATURES_IN_LEN;
+       req.emr_out_buf = payload;
+       req.emr_out_length = MC_CMD_VIRTIO_GET_FEATURES_OUT_LEN;
+
+       MCDI_IN_SET_DWORD(req, VIRTIO_GET_FEATURES_IN_DEVICE_ID, type);
+
+       efx_mcdi_execute(enp, &req);
+
+       if (req.emr_rc != 0) {
+               rc = req.emr_rc;
+               goto fail1;
+       }
+
+       if (req.emr_out_length_used < MC_CMD_VIRTIO_GET_FEATURES_OUT_LEN) {
+               rc = EMSGSIZE;
+               goto fail2;
+       }
+
+       features_lo = MCDI_OUT_DWORD(req, VIRTIO_GET_FEATURES_OUT_FEATURES_LO);
+       features_hi = MCDI_OUT_DWORD(req, VIRTIO_GET_FEATURES_OUT_FEATURES_HI);
+       *featuresp = ((uint64_t)features_hi << 32) | features_lo;
+
+       return (0);
+
+fail2:
+       EFSYS_PROBE(fail2);
+fail1:
+       EFSYS_PROBE1(fail1, efx_rc_t, rc);
+
+       return (rc);
+}
+
 #endif /* EFSYS_OPT_RIVERHEAD && EFSYS_OPT_VIRTIO */