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[2603:8081:140c:1a00:9d4e:47e2:9152:a38a]) by smtp.gmail.com with ESMTPSA id 7sm138758ois.20.2021.04.08.14.41.05 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 08 Apr 2021 14:41:05 -0700 (PDT) From: Bob Pearson X-Google-Original-From: Bob Pearson To: jgg@nvidia.com, xyzxyz2000@gmail.com, linux-rdma@vger.kernel.org Cc: Bob Pearson Subject: [PATCH for-next 4/9] RDMA/rxe: Add ib_alloc_mw and ib_dealloc_mw verbs Date: Thu, 8 Apr 2021 16:40:36 -0500 Message-Id: <20210408214040.2956-5-rpearson@hpe.com> X-Mailer: git-send-email 2.27.0 In-Reply-To: <20210408214040.2956-1-rpearson@hpe.com> References: <20210408214040.2956-1-rpearson@hpe.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-rdma@vger.kernel.org Add ib_alloc_mw and ib_dealloc_mw verbs APIs. Added new file rxe_mw.c focused on MWs. Changed the 8 bit random key generator. Added a cleanup routine for MWs. Added verbs routines to ib_device_ops. Signed-off-by: Bob Pearson --- drivers/infiniband/sw/rxe/Makefile | 1 + drivers/infiniband/sw/rxe/rxe_loc.h | 6 +++ drivers/infiniband/sw/rxe/rxe_mr.c | 20 +++++----- drivers/infiniband/sw/rxe/rxe_mw.c | 53 +++++++++++++++++++++++++++ drivers/infiniband/sw/rxe/rxe_pool.c | 1 + drivers/infiniband/sw/rxe/rxe_verbs.c | 3 ++ drivers/infiniband/sw/rxe/rxe_verbs.h | 2 + 7 files changed, 75 insertions(+), 11 deletions(-) diff --git a/drivers/infiniband/sw/rxe/Makefile b/drivers/infiniband/sw/rxe/Makefile index 66af72dca759..1e24673e9318 100644 --- a/drivers/infiniband/sw/rxe/Makefile +++ b/drivers/infiniband/sw/rxe/Makefile @@ -15,6 +15,7 @@ rdma_rxe-y := \ rxe_qp.o \ rxe_cq.o \ rxe_mr.o \ + rxe_mw.o \ rxe_opcode.o \ rxe_mmap.o \ rxe_icrc.o \ diff --git a/drivers/infiniband/sw/rxe/rxe_loc.h b/drivers/infiniband/sw/rxe/rxe_loc.h index ef8061d2fbe0..edf575930a98 100644 --- a/drivers/infiniband/sw/rxe/rxe_loc.h +++ b/drivers/infiniband/sw/rxe/rxe_loc.h @@ -76,6 +76,7 @@ enum copy_direction { from_mr_obj, }; +u8 rxe_get_next_key(u32 last_key); void rxe_mr_init_dma(struct rxe_pd *pd, int access, struct rxe_mr *mr); int rxe_mr_init_user(struct rxe_pd *pd, u64 start, u64 length, u64 iova, @@ -106,6 +107,11 @@ void rxe_mr_cleanup(struct rxe_pool_entry *arg); int advance_dma_data(struct rxe_dma_info *dma, unsigned int length); +/* rxe_mw.c */ +int rxe_alloc_mw(struct ib_mw *ibmw, struct ib_udata *udata); +int rxe_dealloc_mw(struct ib_mw *ibmw); +void rxe_mw_cleanup(struct rxe_pool_entry *arg); + /* rxe_net.c */ void rxe_loopback(struct sk_buff *skb); int rxe_send(struct rxe_pkt_info *pkt, struct sk_buff *skb); diff --git a/drivers/infiniband/sw/rxe/rxe_mr.c b/drivers/infiniband/sw/rxe/rxe_mr.c index 9f63947bab12..7f2cfc1ce659 100644 --- a/drivers/infiniband/sw/rxe/rxe_mr.c +++ b/drivers/infiniband/sw/rxe/rxe_mr.c @@ -7,19 +7,17 @@ #include "rxe.h" #include "rxe_loc.h" -/* - * lfsr (linear feedback shift register) with period 255 +/* Return a random 8 bit key value that is + * different than the last_key. Set last_key to -1 + * if this is the first key for an MR or MW */ -static u8 rxe_get_key(void) +u8 rxe_get_next_key(u32 last_key) { - static u32 key = 1; - - key = key << 1; - - key |= (0 != (key & 0x100)) ^ (0 != (key & 0x10)) - ^ (0 != (key & 0x80)) ^ (0 != (key & 0x40)); + u8 key; - key &= 0xff; + do { + get_random_bytes(&key, 1); + } while (key == last_key); return key; } @@ -47,7 +45,7 @@ int mr_check_range(struct rxe_mr *mr, u64 iova, size_t length) static void rxe_mr_init(int access, struct rxe_mr *mr) { - u32 lkey = mr->pelem.index << 8 | rxe_get_key(); + u32 lkey = mr->pelem.index << 8 | rxe_get_next_key(-1); u32 rkey = (access & IB_ACCESS_REMOTE) ? lkey : 0; mr->ibmr.lkey = lkey; diff --git a/drivers/infiniband/sw/rxe/rxe_mw.c b/drivers/infiniband/sw/rxe/rxe_mw.c new file mode 100644 index 000000000000..69128e298d44 --- /dev/null +++ b/drivers/infiniband/sw/rxe/rxe_mw.c @@ -0,0 +1,53 @@ +// SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB +/* + * Copyright (c) 2020 Hewlett Packard Enterprise, Inc. All rights reserved. + */ + +#include "rxe.h" + +int rxe_alloc_mw(struct ib_mw *ibmw, struct ib_udata *udata) +{ + struct rxe_mw *mw = to_rmw(ibmw); + struct rxe_pd *pd = to_rpd(ibmw->pd); + struct rxe_dev *rxe = to_rdev(ibmw->device); + int ret; + + rxe_add_ref(pd); + + ret = rxe_add_to_pool(&rxe->mw_pool, mw); + if (ret) { + rxe_drop_ref(pd); + return ret; + } + + rxe_add_index(mw); + ibmw->rkey = (mw->pelem.index << 8) | rxe_get_next_key(-1); + mw->state = (mw->ibmw.type == IB_MW_TYPE_2) ? + RXE_MW_STATE_FREE : RXE_MW_STATE_VALID; + spin_lock_init(&mw->lock); + + return 0; +} + +int rxe_dealloc_mw(struct ib_mw *ibmw) +{ + struct rxe_mw *mw = to_rmw(ibmw); + struct rxe_pd *pd = to_rpd(ibmw->pd); + unsigned long flags; + + spin_lock_irqsave(&mw->lock, flags); + mw->state = RXE_MW_STATE_INVALID; + spin_unlock_irqrestore(&mw->lock, flags); + + rxe_drop_ref(mw); + rxe_drop_ref(pd); + + return 0; +} + +void rxe_mw_cleanup(struct rxe_pool_entry *elem) +{ + struct rxe_mw *mw = container_of(elem, typeof(*mw), pelem); + + rxe_drop_index(mw); +} diff --git a/drivers/infiniband/sw/rxe/rxe_pool.c b/drivers/infiniband/sw/rxe/rxe_pool.c index 2b795e2fc4b3..5b3277e8c35d 100644 --- a/drivers/infiniband/sw/rxe/rxe_pool.c +++ b/drivers/infiniband/sw/rxe/rxe_pool.c @@ -65,6 +65,7 @@ struct rxe_type_info rxe_type_info[RXE_NUM_TYPES] = { .name = "rxe-mw", .size = sizeof(struct rxe_mw), .elem_offset = offsetof(struct rxe_mw, pelem), + .cleanup = rxe_mw_cleanup, .flags = RXE_POOL_INDEX | RXE_POOL_NO_ALLOC, .max_index = RXE_MAX_MW_INDEX, .min_index = RXE_MIN_MW_INDEX, diff --git a/drivers/infiniband/sw/rxe/rxe_verbs.c b/drivers/infiniband/sw/rxe/rxe_verbs.c index aeb5e232c195..fff81bf78a86 100644 --- a/drivers/infiniband/sw/rxe/rxe_verbs.c +++ b/drivers/infiniband/sw/rxe/rxe_verbs.c @@ -1060,6 +1060,7 @@ static const struct ib_device_ops rxe_dev_ops = { .alloc_hw_stats = rxe_ib_alloc_hw_stats, .alloc_mr = rxe_alloc_mr, + .alloc_mw = rxe_alloc_mw, .alloc_pd = rxe_alloc_pd, .alloc_ucontext = rxe_alloc_ucontext, .attach_mcast = rxe_attach_mcast, @@ -1069,6 +1070,7 @@ static const struct ib_device_ops rxe_dev_ops = { .create_srq = rxe_create_srq, .create_user_ah = rxe_create_ah, .dealloc_driver = rxe_dealloc, + .dealloc_mw = rxe_dealloc_mw, .dealloc_pd = rxe_dealloc_pd, .dealloc_ucontext = rxe_dealloc_ucontext, .dereg_mr = rxe_dereg_mr, @@ -1106,6 +1108,7 @@ static const struct ib_device_ops rxe_dev_ops = { INIT_RDMA_OBJ_SIZE(ib_ah, rxe_ah, ibah), INIT_RDMA_OBJ_SIZE(ib_cq, rxe_cq, ibcq), + INIT_RDMA_OBJ_SIZE(ib_mw, rxe_mw, ibmw), INIT_RDMA_OBJ_SIZE(ib_pd, rxe_pd, ibpd), INIT_RDMA_OBJ_SIZE(ib_srq, rxe_srq, ibsrq), INIT_RDMA_OBJ_SIZE(ib_ucontext, rxe_ucontext, ibuc), diff --git a/drivers/infiniband/sw/rxe/rxe_verbs.h b/drivers/infiniband/sw/rxe/rxe_verbs.h index 8d32e3f50813..c8597ae8c833 100644 --- a/drivers/infiniband/sw/rxe/rxe_verbs.h +++ b/drivers/infiniband/sw/rxe/rxe_verbs.h @@ -323,6 +323,8 @@ enum rxe_mw_state { struct rxe_mw { struct ib_mw ibmw; struct rxe_pool_entry pelem; + spinlock_t lock; + enum rxe_mw_state state; }; struct rxe_mc_grp { -- 2.27.0