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net/mlx5: Add reserved-gids support

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Reserved GIDs are entries in the GID table in use by the mlx5_core
and its submodules (e.g. FPGA, SRIOV, E-Swtich, netdev).
The entries are reserved at the high indexes of the GID table.

A mlx5 submodule may reserve a certain amount of GIDs for its own use
during the load sequence by calling mlx5_core_reserve_gids, and must
also take care to un-reserve these GIDs when it closes.
Reservation is only allowed during the load sequence and before any
interfaces (e.g. mlx5_ib or mlx5_en) are up.

After reservation, a submodule may call mlx5_core_reserved_gid_alloc/
free to allocate entries from the reserved GIDs pool.

Reserve a GID table entry for every supported FPGA QP.

A later patch in the patchset will remove them from being reported to
IB core.
Another such patch will make use of these for FPGA QPs in Innova NIC.

Added lib/mlx5.h to serve as a library for mlx5 submodlues, and to
expose only public mlx5 API, more mlx5 library files will be added in
future submissions.

Signed-off-by: Ilan Tayari <ilant@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>
This commit is contained in:
Ilan Tayari
2017-03-26 17:01:57 +03:00
committed by Saeed Mahameed
parent 9ade8c7c3c
commit 52ec462eca
7 changed files with 260 additions and 3 deletions
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17
include/linux/mlx5/driver.h
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@@ -44,6 +44,7 @@
#include <linux/workqueue.h>
#include <linux/mempool.h>
#include <linux/interrupt.h>
#include <linux/idr.h>
#include <linux/mlx5/device.h>
#include <linux/mlx5/doorbell.h>
@@ -737,6 +738,14 @@ struct mlx5e_resources {
struct mlx5_sq_bfreg bfreg;
};
#define MLX5_MAX_RESERVED_GIDS 8
struct mlx5_rsvd_gids {
unsigned int start;
unsigned int count;
struct ida ida;
};
struct mlx5_core_dev {
struct pci_dev *pdev;
/* sync pci state */
@@ -766,6 +775,9 @@ struct mlx5_core_dev {
atomic_t num_qps;
u32 issi;
struct mlx5e_resources mlx5e_res;
struct {
struct mlx5_rsvd_gids reserved_gids;
} roce;
#ifdef CONFIG_MLX5_FPGA
struct mlx5_fpga_device *fpga;
#endif
@@ -1045,6 +1057,11 @@ int mlx5_alloc_bfreg(struct mlx5_core_dev *mdev, struct mlx5_sq_bfreg *bfreg,
bool map_wc, bool fast_path);
void mlx5_free_bfreg(struct mlx5_core_dev *mdev, struct mlx5_sq_bfreg *bfreg);
unsigned int mlx5_core_reserved_gids_count(struct mlx5_core_dev *dev);
int mlx5_core_roce_gid_set(struct mlx5_core_dev *dev, unsigned int index,
u8 roce_version, u8 roce_l3_type, const u8 *gid,
const u8 *mac, bool vlan, u16 vlan_id);
static inline int fw_initializing(struct mlx5_core_dev *dev)
{
return ioread32be(&dev->iseg->initializing) >> 31;