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IB/srp: Use FMRs to map gather/scatter lists

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Create an SRP FMR pool on HCAs that support FMRs, and use FMRs to map
gather/scatter lists that have more than one entry into a single
memory region that appears virtually contiguous to the SRP target
(which is the RDMA initiator).

This patch bails out on FMR mapping for SCSI commands where the
gather/scatter list cannot be mapped into a single FMR because there
are sub-page-sized entries in middle of the list.  An unaligned
start or end of the list is OK.

Based on a patch by Vu Pham <vuhuong@mellanox.com>.

Signed-off-by: Roland Dreier <rolandd@cisco.com>
This commit is contained in:
Roland Dreier
2006-06-17 20:37:29 -07:00
parent a26026c122
commit f5358a172f
2 changed files with 228 additions and 87 deletions
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25
drivers/infiniband/ulp/srp/ib_srp.h
View File

@ -46,6 +46,7 @@
#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,
@ -62,7 +63,11 @@ enum {
SRP_SQ_SIZE = SRP_RQ_SIZE - 1,
SRP_CQ_SIZE = SRP_SQ_SIZE + SRP_RQ_SIZE,
SRP_TAG_TSK_MGMT = 1 << (SRP_RQ_SHIFT + 1)
SRP_TAG_TSK_MGMT = 1 << (SRP_RQ_SHIFT + 1),
SRP_FMR_SIZE = 256,
SRP_FMR_POOL_SIZE = 1024,
SRP_FMR_DIRTY_SIZE = SRP_FMR_POOL_SIZE / 4
};
#define SRP_OP_RECV (1 << 31)
@ -77,15 +82,24 @@ enum srp_target_state {
SRP_TARGET_REMOVED
};
struct srp_host {
u8 initiator_port_id[16];
struct srp_device {
struct list_head dev_list;
struct ib_device *dev;
u8 port;
struct ib_pd *pd;
struct ib_mr *mr;
struct ib_fmr_pool *fmr_pool;
int fmr_page_shift;
int fmr_page_size;
unsigned long fmr_page_mask;
};
struct srp_host {
u8 initiator_port_id[16];
struct srp_device *dev;
u8 port;
struct class_device class_dev;
struct list_head target_list;
struct mutex target_mutex;
struct mutex target_mutex;
struct completion released;
struct list_head list;
};
@ -95,6 +109,7 @@ struct srp_request {
struct scsi_cmnd *scmnd;
struct srp_iu *cmd;
struct srp_iu *tsk_mgmt;
struct ib_pool_fmr *fmr;
/*
* Fake scatterlist used when scmnd->use_sg==0. Can be killed
* when the SCSI midlayer no longer generates non-SG commands.