From 0ac531c1832318efa3dc3d723e356a7e09330e80 Mon Sep 17 00:00:00 2001 From: Chuck Lever Date: Wed, 28 May 2014 10:32:43 -0400 Subject: [PATCH] xprtrdma: Remove REGISTER memory registration mode All kernel RDMA providers except amso1100 support either MTHCAFMR or FRMR, both of which are faster than REGISTER. amso1100 can continue to use ALLPHYSICAL. The only other ULP consumer in the kernel that uses the reg_phys_mr verb is Lustre. Signed-off-by: Chuck Lever Signed-off-by: Anna Schumaker --- net/sunrpc/xprtrdma/rpc_rdma.c | 3 +- net/sunrpc/xprtrdma/verbs.c | 90 ++-------------------------------- 2 files changed, 5 insertions(+), 88 deletions(-) diff --git a/net/sunrpc/xprtrdma/rpc_rdma.c b/net/sunrpc/xprtrdma/rpc_rdma.c index 46b51727227b..aae1726ca381 100644 --- a/net/sunrpc/xprtrdma/rpc_rdma.c +++ b/net/sunrpc/xprtrdma/rpc_rdma.c @@ -476,8 +476,7 @@ rpcrdma_marshal_req(struct rpc_rqst *rqst) * on receive. Therefore, we request a reply chunk * for non-writes wherever feasible and efficient. */ - if (wtype == rpcrdma_noch && - r_xprt->rx_ia.ri_memreg_strategy > RPCRDMA_REGISTER) + if (wtype == rpcrdma_noch) wtype = rpcrdma_replych; } } diff --git a/net/sunrpc/xprtrdma/verbs.c b/net/sunrpc/xprtrdma/verbs.c index 304c7adc83c4..6bb9a07f7d49 100644 --- a/net/sunrpc/xprtrdma/verbs.c +++ b/net/sunrpc/xprtrdma/verbs.c @@ -494,19 +494,11 @@ rpcrdma_ia_open(struct rpcrdma_xprt *xprt, struct sockaddr *addr, int memreg) switch (memreg) { case RPCRDMA_MTHCAFMR: if (!ia->ri_id->device->alloc_fmr) { -#if RPCRDMA_PERSISTENT_REGISTRATION dprintk("RPC: %s: MTHCAFMR registration " "specified but not supported by adapter, " "using riskier RPCRDMA_ALLPHYSICAL\n", __func__); memreg = RPCRDMA_ALLPHYSICAL; -#else - dprintk("RPC: %s: MTHCAFMR registration " - "specified but not supported by adapter, " - "using slower RPCRDMA_REGISTER\n", - __func__); - memreg = RPCRDMA_REGISTER; -#endif } break; case RPCRDMA_FRMR: @@ -514,19 +506,11 @@ rpcrdma_ia_open(struct rpcrdma_xprt *xprt, struct sockaddr *addr, int memreg) if ((devattr.device_cap_flags & (IB_DEVICE_MEM_MGT_EXTENSIONS|IB_DEVICE_LOCAL_DMA_LKEY)) != (IB_DEVICE_MEM_MGT_EXTENSIONS|IB_DEVICE_LOCAL_DMA_LKEY)) { -#if RPCRDMA_PERSISTENT_REGISTRATION dprintk("RPC: %s: FRMR registration " "specified but not supported by adapter, " "using riskier RPCRDMA_ALLPHYSICAL\n", __func__); memreg = RPCRDMA_ALLPHYSICAL; -#else - dprintk("RPC: %s: FRMR registration " - "specified but not supported by adapter, " - "using slower RPCRDMA_REGISTER\n", - __func__); - memreg = RPCRDMA_REGISTER; -#endif } else { /* Mind the ia limit on FRMR page list depth */ ia->ri_max_frmr_depth = min_t(unsigned int, @@ -545,7 +529,6 @@ rpcrdma_ia_open(struct rpcrdma_xprt *xprt, struct sockaddr *addr, int memreg) * adapter. */ switch (memreg) { - case RPCRDMA_REGISTER: case RPCRDMA_FRMR: break; #if RPCRDMA_PERSISTENT_REGISTRATION @@ -565,11 +548,10 @@ rpcrdma_ia_open(struct rpcrdma_xprt *xprt, struct sockaddr *addr, int memreg) ia->ri_bind_mem = ib_get_dma_mr(ia->ri_pd, mem_priv); if (IS_ERR(ia->ri_bind_mem)) { printk(KERN_ALERT "%s: ib_get_dma_mr for " - "phys register failed with %lX\n\t" - "Will continue with degraded performance\n", + "phys register failed with %lX\n", __func__, PTR_ERR(ia->ri_bind_mem)); - memreg = RPCRDMA_REGISTER; - ia->ri_bind_mem = NULL; + rc = -ENOMEM; + goto out2; } break; default: @@ -1611,67 +1593,6 @@ rpcrdma_deregister_fmr_external(struct rpcrdma_mr_seg *seg, return rc; } -static int -rpcrdma_register_default_external(struct rpcrdma_mr_seg *seg, - int *nsegs, int writing, struct rpcrdma_ia *ia) -{ - int mem_priv = (writing ? IB_ACCESS_REMOTE_WRITE : - IB_ACCESS_REMOTE_READ); - struct rpcrdma_mr_seg *seg1 = seg; - struct ib_phys_buf ipb[RPCRDMA_MAX_DATA_SEGS]; - int len, i, rc = 0; - - if (*nsegs > RPCRDMA_MAX_DATA_SEGS) - *nsegs = RPCRDMA_MAX_DATA_SEGS; - for (len = 0, i = 0; i < *nsegs;) { - rpcrdma_map_one(ia, seg, writing); - ipb[i].addr = seg->mr_dma; - ipb[i].size = seg->mr_len; - len += seg->mr_len; - ++seg; - ++i; - /* Check for holes */ - if ((i < *nsegs && offset_in_page(seg->mr_offset)) || - offset_in_page((seg-1)->mr_offset+(seg-1)->mr_len)) - break; - } - seg1->mr_base = seg1->mr_dma; - seg1->mr_chunk.rl_mr = ib_reg_phys_mr(ia->ri_pd, - ipb, i, mem_priv, &seg1->mr_base); - if (IS_ERR(seg1->mr_chunk.rl_mr)) { - rc = PTR_ERR(seg1->mr_chunk.rl_mr); - dprintk("RPC: %s: failed ib_reg_phys_mr " - "%u@0x%llx (%d)... status %i\n", - __func__, len, - (unsigned long long)seg1->mr_dma, i, rc); - while (i--) - rpcrdma_unmap_one(ia, --seg); - } else { - seg1->mr_rkey = seg1->mr_chunk.rl_mr->rkey; - seg1->mr_nsegs = i; - seg1->mr_len = len; - } - *nsegs = i; - return rc; -} - -static int -rpcrdma_deregister_default_external(struct rpcrdma_mr_seg *seg, - struct rpcrdma_ia *ia) -{ - struct rpcrdma_mr_seg *seg1 = seg; - int rc; - - rc = ib_dereg_mr(seg1->mr_chunk.rl_mr); - seg1->mr_chunk.rl_mr = NULL; - while (seg1->mr_nsegs--) - rpcrdma_unmap_one(ia, seg++); - if (rc) - dprintk("RPC: %s: failed ib_dereg_mr," - " status %i\n", __func__, rc); - return rc; -} - int rpcrdma_register_external(struct rpcrdma_mr_seg *seg, int nsegs, int writing, struct rpcrdma_xprt *r_xprt) @@ -1701,10 +1622,8 @@ rpcrdma_register_external(struct rpcrdma_mr_seg *seg, rc = rpcrdma_register_fmr_external(seg, &nsegs, writing, ia); break; - /* Default registration each time */ default: - rc = rpcrdma_register_default_external(seg, &nsegs, writing, ia); - break; + return -1; } if (rc) return -1; @@ -1738,7 +1657,6 @@ rpcrdma_deregister_external(struct rpcrdma_mr_seg *seg, break; default: - rc = rpcrdma_deregister_default_external(seg, ia); break; } if (r) {