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xprtrdma: Remove rpcrdma_buffer::rb_mrlock

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Clean up: Now that the free list is used sparingly, get rid of the
separate spin lock protecting it.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
This commit is contained in:
Chuck Lever 2019-08-19 18:47:57 -04:00 committed by Anna Schumaker
parent 6dc6ec9e04
commit 4d6b8890dd
3 changed files with 16 additions and 18 deletions
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4
net/sunrpc/xprtrdma/frwr_ops.c
View File

@ -106,10 +106,10 @@ frwr_mr_recycle_worker(struct work_struct *work)
mr->mr_dir = DMA_NONE;
}
spin_lock(&r_xprt->rx_buf.rb_mrlock);
spin_lock(&r_xprt->rx_buf.rb_lock);
list_del(&mr->mr_all);
r_xprt->rx_stats.mrs_recycled++;
spin_unlock(&r_xprt->rx_buf.rb_mrlock);
spin_unlock(&r_xprt->rx_buf.rb_lock);
frwr_release_mr(mr);
}

21
net/sunrpc/xprtrdma/verbs.c
View File

@ -962,10 +962,10 @@ rpcrdma_mrs_create(struct rpcrdma_xprt *r_xprt)
mr->mr_xprt = r_xprt;
spin_lock(&buf->rb_mrlock);
spin_lock(&buf->rb_lock);
list_add(&mr->mr_list, &buf->rb_mrs);
list_add(&mr->mr_all, &buf->rb_all_mrs);
spin_unlock(&buf->rb_mrlock);
spin_unlock(&buf->rb_lock);
}
r_xprt->rx_stats.mrs_allocated += count;
@ -1084,7 +1084,6 @@ int rpcrdma_buffer_create(struct rpcrdma_xprt *r_xprt)
buf->rb_max_requests = r_xprt->rx_ep.rep_max_requests;
buf->rb_bc_srv_max_requests = 0;
spin_lock_init(&buf->rb_mrlock);
spin_lock_init(&buf->rb_lock);
INIT_LIST_HEAD(&buf->rb_mrs);
INIT_LIST_HEAD(&buf->rb_all_mrs);
@ -1154,18 +1153,18 @@ rpcrdma_mrs_destroy(struct rpcrdma_buffer *buf)
unsigned int count;
count = 0;
spin_lock(&buf->rb_mrlock);
spin_lock(&buf->rb_lock);
while ((mr = list_first_entry_or_null(&buf->rb_all_mrs,
struct rpcrdma_mr,
mr_all)) != NULL) {
list_del(&mr->mr_all);
spin_unlock(&buf->rb_mrlock);
spin_unlock(&buf->rb_lock);
frwr_release_mr(mr);
count++;
spin_lock(&buf->rb_mrlock);
spin_lock(&buf->rb_lock);
}
spin_unlock(&buf->rb_mrlock);
spin_unlock(&buf->rb_lock);
r_xprt->rx_stats.mrs_allocated = 0;
}
@ -1218,9 +1217,9 @@ rpcrdma_mr_get(struct rpcrdma_xprt *r_xprt)
struct rpcrdma_buffer *buf = &r_xprt->rx_buf;
struct rpcrdma_mr *mr;
spin_lock(&buf->rb_mrlock);
spin_lock(&buf->rb_lock);
mr = rpcrdma_mr_pop(&buf->rb_mrs);
spin_unlock(&buf->rb_mrlock);
spin_unlock(&buf->rb_lock);
return mr;
}
@ -1249,9 +1248,9 @@ static void rpcrdma_mr_free(struct rpcrdma_mr *mr)
struct rpcrdma_buffer *buf = &r_xprt->rx_buf;
mr->mr_req = NULL;
spin_lock(&buf->rb_mrlock);
spin_lock(&buf->rb_lock);
rpcrdma_mr_push(mr, &buf->rb_mrs);
spin_unlock(&buf->rb_mrlock);
spin_unlock(&buf->rb_lock);
}
/**

9
net/sunrpc/xprtrdma/xprt_rdma.h
View File

@ -360,19 +360,18 @@ rpcrdma_mr_pop(struct list_head *list)
* One of these is associated with a transport instance
*/
struct rpcrdma_buffer {
spinlock_t rb_mrlock; /* protect rb_mrs list */
spinlock_t rb_lock;
struct list_head rb_send_bufs;
struct list_head rb_recv_bufs;
struct list_head rb_mrs;
struct list_head rb_all_mrs;
unsigned long rb_sc_head;
unsigned long rb_sc_tail;
unsigned long rb_sc_last;
struct rpcrdma_sendctx **rb_sc_ctxs;
spinlock_t rb_lock; /* protect buf lists */
struct list_head rb_send_bufs;
struct list_head rb_recv_bufs;
struct list_head rb_allreqs;
struct list_head rb_all_mrs;
u32 rb_max_requests;
u32 rb_credits; /* most recent credit grant */