linux_dsm_epyc7002/drivers/infiniband/ulp/srp/ib_srp.h
David Dillow 8f26c9ff9c IB/srp: rework mapping engine to use multiple FMR entries
Instead of forcing all of the S/G entries to fit in one FMR, and falling
back to indirect descriptors if that fails, allow the use of as many
FMRs as needed to map the request. This lays the groundwork for allowing
indirect descriptor tables that are larger than can fit in the command
IU, but should marginally improve performance now by reducing the number
of indirect descriptors needed.

We increase the minimum page size for the FMR pool to 4K, as larger
pages help increase the coverage of each FMR, and it is rare that the
kernel would send down a request with scattered 512 byte fragments.

This patch also move some of the target initialization code afte the
parsing of options, to keep it together with the new code that needs to
allocate memory based on the options given.

Signed-off-by: David Dillow <dillowda@ornl.gov>
2011-03-15 19:35:16 -04:00

205 lines
4.9 KiB
C

/*
* Copyright (c) 2005 Cisco Systems. All rights reserved.
*
* This software is available to you under a choice of one of two
* licenses. You may choose to be licensed under the terms of the GNU
* General Public License (GPL) Version 2, available from the file
* COPYING in the main directory of this source tree, or the
* OpenIB.org BSD license below:
*
* Redistribution and use in source and binary forms, with or
* without modification, are permitted provided that the following
* conditions are met:
*
* - Redistributions of source code must retain the above
* copyright notice, this list of conditions and the following
* disclaimer.
*
* - Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials
* provided with the distribution.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#ifndef IB_SRP_H
#define IB_SRP_H
#include <linux/types.h>
#include <linux/list.h>
#include <linux/mutex.h>
#include <linux/scatterlist.h>
#include <scsi/scsi_host.h>
#include <scsi/scsi_cmnd.h>
#include <rdma/ib_verbs.h>
#include <rdma/ib_sa.h>
#include <rdma/ib_cm.h>
#include <rdma/ib_fmr_pool.h>
enum {
SRP_PATH_REC_TIMEOUT_MS = 1000,
SRP_ABORT_TIMEOUT_MS = 5000,
SRP_PORT_REDIRECT = 1,
SRP_DLID_REDIRECT = 2,
SRP_STALE_CONN = 3,
SRP_MAX_LUN = 512,
SRP_DEF_SG_TABLESIZE = 12,
SRP_RQ_SHIFT = 6,
SRP_RQ_SIZE = 1 << SRP_RQ_SHIFT,
SRP_SQ_SIZE = SRP_RQ_SIZE,
SRP_RSP_SQ_SIZE = 1,
SRP_REQ_SQ_SIZE = SRP_SQ_SIZE - SRP_RSP_SQ_SIZE,
SRP_TSK_MGMT_SQ_SIZE = 1,
SRP_CMD_SQ_SIZE = SRP_REQ_SQ_SIZE - SRP_TSK_MGMT_SQ_SIZE,
SRP_TAG_NO_REQ = ~0U,
SRP_TAG_TSK_MGMT = 1U << 31,
SRP_FMR_SIZE = 256,
SRP_FMR_POOL_SIZE = 1024,
SRP_FMR_DIRTY_SIZE = SRP_FMR_POOL_SIZE / 4,
SRP_MAP_ALLOW_FMR = 0,
SRP_MAP_NO_FMR = 1,
};
enum srp_target_state {
SRP_TARGET_LIVE,
SRP_TARGET_CONNECTING,
SRP_TARGET_DEAD,
SRP_TARGET_REMOVED
};
enum srp_iu_type {
SRP_IU_CMD,
SRP_IU_TSK_MGMT,
SRP_IU_RSP,
};
struct srp_device {
struct list_head dev_list;
struct ib_device *dev;
struct ib_pd *pd;
struct ib_mr *mr;
struct ib_fmr_pool *fmr_pool;
u64 fmr_page_mask;
int fmr_page_size;
int fmr_max_size;
};
struct srp_host {
struct srp_device *srp_dev;
u8 port;
struct device dev;
struct list_head target_list;
spinlock_t target_lock;
struct completion released;
struct list_head list;
};
struct srp_request {
struct list_head list;
struct scsi_cmnd *scmnd;
struct srp_iu *cmd;
struct ib_pool_fmr **fmr_list;
u64 *map_page;
short nfmr;
short index;
};
struct srp_target_port {
/* These are RW in the hot path, and commonly used together */
struct list_head free_tx;
struct list_head free_reqs;
spinlock_t lock;
s32 req_lim;
/* These are read-only in the hot path */
struct ib_cq *send_cq ____cacheline_aligned_in_smp;
struct ib_cq *recv_cq;
struct ib_qp *qp;
u32 lkey;
u32 rkey;
enum srp_target_state state;
unsigned int max_iu_len;
unsigned int cmd_sg_cnt;
/* Everything above this point is used in the hot path of
* command processing. Try to keep them packed into cachelines.
*/
__be64 id_ext;
__be64 ioc_guid;
__be64 service_id;
__be64 initiator_ext;
u16 io_class;
struct srp_host *srp_host;
struct Scsi_Host *scsi_host;
char target_name[32];
unsigned int scsi_id;
struct ib_sa_path_rec path;
__be16 orig_dgid[8];
struct ib_sa_query *path_query;
int path_query_id;
struct ib_cm_id *cm_id;
int max_ti_iu_len;
int zero_req_lim;
struct srp_iu *tx_ring[SRP_SQ_SIZE];
struct srp_iu *rx_ring[SRP_RQ_SIZE];
struct srp_request req_ring[SRP_CMD_SQ_SIZE];
struct work_struct work;
struct list_head list;
struct completion done;
int status;
int qp_in_error;
struct completion tsk_mgmt_done;
u8 tsk_mgmt_status;
};
struct srp_iu {
struct list_head list;
u64 dma;
void *buf;
size_t size;
enum dma_data_direction direction;
};
struct srp_map_state {
struct ib_pool_fmr **next_fmr;
struct srp_direct_buf *desc;
u64 *pages;
dma_addr_t base_dma_addr;
u32 fmr_len;
u32 total_len;
unsigned int npages;
unsigned int nfmr;
unsigned int ndesc;
struct scatterlist *unmapped_sg;
int unmapped_index;
dma_addr_t unmapped_addr;
};
#endif /* IB_SRP_H */