mlx4: Modify proxy/tunnel QP mechanism so that guests do no calculations

Previously, the structure of a guest's proxy QPs followed the
structure of the PPF special qps (qp0 port 1, qp0 port 2, qp1 port 1,
qp1 port 2, ...).  The guest then did offset calculations on the
sqp_base qp number that the PPF passed to it in QUERY_FUNC_CAP().

This is now changed so that the guest does no offset calculations
regarding proxy or tunnel QPs to use.  This change frees the PPF from
needing to adhere to a specific order in allocating proxy and tunnel
QPs.

Now QUERY_FUNC_CAP provides each port individually with its proxy
qp0, proxy qp1, tunnel qp0, and tunnel qp1 QP numbers, and these are
used directly where required (with no offset calculations).

To accomplish this change, several fields were added to the phys_caps
structure for use by the PPF and by non-SR-IOV mode:

    base_sqpn -- in non-sriov mode, this was formerly sqp_start.
    base_proxy_sqpn -- the first physical proxy qp number -- used by PPF
    base_tunnel_sqpn -- the first physical tunnel qp number -- used by PPF.

The current code in the PPF still adheres to the previous layout of
sqps, proxy-sqps and tunnel-sqps.  However, the PPF can change this
layout without affecting VF or (paravirtualized) PF code.

Signed-off-by: Jack Morgenstein <jackm@dev.mellanox.co.il>
Signed-off-by: Roland Dreier <roland@purestorage.com>

1 files changed, 10 insertions, 6 deletions

diff --git a/include/linux/mlx4/device.h b/include/linux/mlx4/device.h
index c0f8f74a0a5e..6d1acb04cd17 100644
--- a/include/linux/mlx4/device.h
+++ b/include/linux/mlx4/device.h
@@ -328,6 +328,9 @@ struct mlx4_phys_caps {
         u32                     gid_phys_table_len[MLX4_MAX_PORTS + 1];
         u32                     pkey_phys_table_len[MLX4_MAX_PORTS + 1];
         u32                     num_phys_eqs;
+        u32                     base_sqpn;
+        u32                     base_proxy_sqpn;
+        u32                     base_tunnel_sqpn;
 };
 
 struct mlx4_caps {
@@ -358,9 +361,10 @@ struct mlx4_caps {
         int                     max_rq_desc_sz;
         int                     max_qp_init_rdma;
         int                     max_qp_dest_rdma;
-        int                     sqp_start;
-        u32                     base_sqpn;
-        u32                     base_tunnel_sqpn;
+        u32                     *qp0_proxy;
+        u32                     *qp1_proxy;
+        u32                     *qp0_tunnel;
+        u32                     *qp1_tunnel;
         int                     num_srqs;
         int                     max_srq_wqes;
         int                     max_srq_sge;
@@ -722,15 +726,15 @@ static inline int mlx4_is_master(struct mlx4_dev *dev)
 
 static inline int mlx4_is_qp_reserved(struct mlx4_dev *dev, u32 qpn)
 {
-        return (qpn < dev->caps.base_sqpn + 8 +
+        return (qpn < dev->phys_caps.base_sqpn + 8 +
                 16 * MLX4_MFUNC_MAX * !!mlx4_is_master(dev));
 }
 
 static inline int mlx4_is_guest_proxy(struct mlx4_dev *dev, int slave, u32 qpn)
 {
-        int base = dev->caps.sqp_start + slave * 8;
+        int guest_proxy_base = dev->phys_caps.base_proxy_sqpn + slave * 8;
 
-        if (qpn >= base && qpn < base + 8)
+        if (qpn >= guest_proxy_base && qpn < guest_proxy_base + 8)
                 return 1;
 
         return 0;