From: Bob Pearson rpearsonhpe@gmail.com
[ Upstream commit 001345339f4ca85790a1644a74e33ae77ac116be ]
Separate software and simulated hardware lkeys and rkeys for MRs and MWs. This makes struct ib_mr and struct ib_mw isolated from hardware changes triggered by executing work requests.
This change fixes a bug seen in blktest.
Link: https://lore.kernel.org/r/20210914164206.19768-4-rpearsonhpe@gmail.com Signed-off-by: Bob Pearson rpearsonhpe@gmail.com Signed-off-by: Jason Gunthorpe jgg@nvidia.com Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/infiniband/sw/rxe/rxe_loc.h | 1 + drivers/infiniband/sw/rxe/rxe_mr.c | 69 ++++++++++++++++++++++----- drivers/infiniband/sw/rxe/rxe_mw.c | 30 ++++++------ drivers/infiniband/sw/rxe/rxe_req.c | 14 ++---- drivers/infiniband/sw/rxe/rxe_verbs.h | 18 ++----- 5 files changed, 81 insertions(+), 51 deletions(-)
diff --git a/drivers/infiniband/sw/rxe/rxe_loc.h b/drivers/infiniband/sw/rxe/rxe_loc.h index f0c954575bdec..4fd73b51fabf2 100644 --- a/drivers/infiniband/sw/rxe/rxe_loc.h +++ b/drivers/infiniband/sw/rxe/rxe_loc.h @@ -86,6 +86,7 @@ struct rxe_mr *lookup_mr(struct rxe_pd *pd, int access, u32 key, int mr_check_range(struct rxe_mr *mr, u64 iova, size_t length); int advance_dma_data(struct rxe_dma_info *dma, unsigned int length); int rxe_invalidate_mr(struct rxe_qp *qp, u32 rkey); +int rxe_reg_fast_mr(struct rxe_qp *qp, struct rxe_send_wqe *wqe); int rxe_dereg_mr(struct ib_mr *ibmr, struct ib_udata *udata); void rxe_mr_cleanup(struct rxe_pool_entry *arg);
diff --git a/drivers/infiniband/sw/rxe/rxe_mr.c b/drivers/infiniband/sw/rxe/rxe_mr.c index 5890a82462161..bedcf15aaea75 100644 --- a/drivers/infiniband/sw/rxe/rxe_mr.c +++ b/drivers/infiniband/sw/rxe/rxe_mr.c @@ -48,8 +48,14 @@ static void rxe_mr_init(int access, struct rxe_mr *mr) u32 lkey = mr->pelem.index << 8 | rxe_get_next_key(-1); u32 rkey = (access & IB_ACCESS_REMOTE) ? lkey : 0;
- mr->ibmr.lkey = lkey; - mr->ibmr.rkey = rkey; + /* set ibmr->l/rkey and also copy into private l/rkey + * for user MRs these will always be the same + * for cases where caller 'owns' the key portion + * they may be different until REG_MR WQE is executed. + */ + mr->lkey = mr->ibmr.lkey = lkey; + mr->rkey = mr->ibmr.rkey = rkey; + mr->state = RXE_MR_STATE_INVALID; mr->type = RXE_MR_TYPE_NONE; mr->map_shift = ilog2(RXE_BUF_PER_MAP); @@ -191,10 +197,8 @@ int rxe_mr_init_fast(struct rxe_pd *pd, int max_pages, struct rxe_mr *mr) { int err;
- rxe_mr_init(0, mr); - - /* In fastreg, we also set the rkey */ - mr->ibmr.rkey = mr->ibmr.lkey; + /* always allow remote access for FMRs */ + rxe_mr_init(IB_ACCESS_REMOTE, mr);
err = rxe_mr_alloc(mr, max_pages); if (err) @@ -507,8 +511,8 @@ struct rxe_mr *lookup_mr(struct rxe_pd *pd, int access, u32 key, if (!mr) return NULL;
- if (unlikely((type == RXE_LOOKUP_LOCAL && mr_lkey(mr) != key) || - (type == RXE_LOOKUP_REMOTE && mr_rkey(mr) != key) || + if (unlikely((type == RXE_LOOKUP_LOCAL && mr->lkey != key) || + (type == RXE_LOOKUP_REMOTE && mr->rkey != key) || mr_pd(mr) != pd || (access && !(access & mr->access)) || mr->state != RXE_MR_STATE_VALID)) { rxe_drop_ref(mr); @@ -531,9 +535,9 @@ int rxe_invalidate_mr(struct rxe_qp *qp, u32 rkey) goto err; }
- if (rkey != mr->ibmr.rkey) { - pr_err("%s: rkey (%#x) doesn't match mr->ibmr.rkey (%#x)\n", - __func__, rkey, mr->ibmr.rkey); + if (rkey != mr->rkey) { + pr_err("%s: rkey (%#x) doesn't match mr->rkey (%#x)\n", + __func__, rkey, mr->rkey); ret = -EINVAL; goto err_drop_ref; } @@ -554,6 +558,49 @@ err: return ret; }
+/* user can (re)register fast MR by executing a REG_MR WQE. + * user is expected to hold a reference on the ib mr until the + * WQE completes. + * Once a fast MR is created this is the only way to change the + * private keys. It is the responsibility of the user to maintain + * the ib mr keys in sync with rxe mr keys. + */ +int rxe_reg_fast_mr(struct rxe_qp *qp, struct rxe_send_wqe *wqe) +{ + struct rxe_mr *mr = to_rmr(wqe->wr.wr.reg.mr); + u32 key = wqe->wr.wr.reg.key; + u32 access = wqe->wr.wr.reg.access; + + /* user can only register MR in free state */ + if (unlikely(mr->state != RXE_MR_STATE_FREE)) { + pr_warn("%s: mr->lkey = 0x%x not free\n", + __func__, mr->lkey); + return -EINVAL; + } + + /* user can only register mr with qp in same protection domain */ + if (unlikely(qp->ibqp.pd != mr->ibmr.pd)) { + pr_warn("%s: qp->pd and mr->pd don't match\n", + __func__); + return -EINVAL; + } + + /* user is only allowed to change key portion of l/rkey */ + if (unlikely((mr->lkey & ~0xff) != (key & ~0xff))) { + pr_warn("%s: key = 0x%x has wrong index mr->lkey = 0x%x\n", + __func__, key, mr->lkey); + return -EINVAL; + } + + mr->access = access; + mr->lkey = key; + mr->rkey = (access & IB_ACCESS_REMOTE) ? key : 0; + mr->iova = wqe->wr.wr.reg.mr->iova; + mr->state = RXE_MR_STATE_VALID; + + return 0; +} + int rxe_dereg_mr(struct ib_mr *ibmr, struct ib_udata *udata) { struct rxe_mr *mr = to_rmr(ibmr); diff --git a/drivers/infiniband/sw/rxe/rxe_mw.c b/drivers/infiniband/sw/rxe/rxe_mw.c index 5ba77df7598ed..a5e2ea7d80f02 100644 --- a/drivers/infiniband/sw/rxe/rxe_mw.c +++ b/drivers/infiniband/sw/rxe/rxe_mw.c @@ -21,7 +21,7 @@ int rxe_alloc_mw(struct ib_mw *ibmw, struct ib_udata *udata) }
rxe_add_index(mw); - ibmw->rkey = (mw->pelem.index << 8) | rxe_get_next_key(-1); + mw->rkey = 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); @@ -71,6 +71,8 @@ int rxe_dealloc_mw(struct ib_mw *ibmw) static int rxe_check_bind_mw(struct rxe_qp *qp, struct rxe_send_wqe *wqe, struct rxe_mw *mw, struct rxe_mr *mr) { + u32 key = wqe->wr.wr.mw.rkey & 0xff; + if (mw->ibmw.type == IB_MW_TYPE_1) { if (unlikely(mw->state != RXE_MW_STATE_VALID)) { pr_err_once( @@ -108,7 +110,7 @@ static int rxe_check_bind_mw(struct rxe_qp *qp, struct rxe_send_wqe *wqe, } }
- if (unlikely((wqe->wr.wr.mw.rkey & 0xff) == (mw->ibmw.rkey & 0xff))) { + if (unlikely(key == (mw->rkey & 0xff))) { pr_err_once("attempt to bind MW with same key\n"); return -EINVAL; } @@ -161,13 +163,9 @@ static int rxe_check_bind_mw(struct rxe_qp *qp, struct rxe_send_wqe *wqe, static void rxe_do_bind_mw(struct rxe_qp *qp, struct rxe_send_wqe *wqe, struct rxe_mw *mw, struct rxe_mr *mr) { - u32 rkey; - u32 new_rkey; - - rkey = mw->ibmw.rkey; - new_rkey = (rkey & 0xffffff00) | (wqe->wr.wr.mw.rkey & 0x000000ff); + u32 key = wqe->wr.wr.mw.rkey & 0xff;
- mw->ibmw.rkey = new_rkey; + mw->rkey = (mw->rkey & ~0xff) | key; mw->access = wqe->wr.wr.mw.access; mw->state = RXE_MW_STATE_VALID; mw->addr = wqe->wr.wr.mw.addr; @@ -197,29 +195,29 @@ int rxe_bind_mw(struct rxe_qp *qp, struct rxe_send_wqe *wqe) struct rxe_mw *mw; struct rxe_mr *mr; struct rxe_dev *rxe = to_rdev(qp->ibqp.device); + u32 mw_rkey = wqe->wr.wr.mw.mw_rkey; + u32 mr_lkey = wqe->wr.wr.mw.mr_lkey; unsigned long flags;
- mw = rxe_pool_get_index(&rxe->mw_pool, - wqe->wr.wr.mw.mw_rkey >> 8); + mw = rxe_pool_get_index(&rxe->mw_pool, mw_rkey >> 8); if (unlikely(!mw)) { ret = -EINVAL; goto err; }
- if (unlikely(mw->ibmw.rkey != wqe->wr.wr.mw.mw_rkey)) { + if (unlikely(mw->rkey != mw_rkey)) { ret = -EINVAL; goto err_drop_mw; }
if (likely(wqe->wr.wr.mw.length)) { - mr = rxe_pool_get_index(&rxe->mr_pool, - wqe->wr.wr.mw.mr_lkey >> 8); + mr = rxe_pool_get_index(&rxe->mr_pool, mr_lkey >> 8); if (unlikely(!mr)) { ret = -EINVAL; goto err_drop_mw; }
- if (unlikely(mr->ibmr.lkey != wqe->wr.wr.mw.mr_lkey)) { + if (unlikely(mr->lkey != mr_lkey)) { ret = -EINVAL; goto err_drop_mr; } @@ -292,7 +290,7 @@ int rxe_invalidate_mw(struct rxe_qp *qp, u32 rkey) goto err; }
- if (rkey != mw->ibmw.rkey) { + if (rkey != mw->rkey) { ret = -EINVAL; goto err_drop_ref; } @@ -323,7 +321,7 @@ struct rxe_mw *rxe_lookup_mw(struct rxe_qp *qp, int access, u32 rkey) if (!mw) return NULL;
- if (unlikely((rxe_mw_rkey(mw) != rkey) || rxe_mw_pd(mw) != pd || + if (unlikely((mw->rkey != rkey) || rxe_mw_pd(mw) != pd || (mw->ibmw.type == IB_MW_TYPE_2 && mw->qp != qp) || (mw->length == 0) || (access && !(access & mw->access)) || diff --git a/drivers/infiniband/sw/rxe/rxe_req.c b/drivers/infiniband/sw/rxe/rxe_req.c index 3894197a82f62..fc996fd31e589 100644 --- a/drivers/infiniband/sw/rxe/rxe_req.c +++ b/drivers/infiniband/sw/rxe/rxe_req.c @@ -572,7 +572,6 @@ static void update_state(struct rxe_qp *qp, struct rxe_send_wqe *wqe, static int rxe_do_local_ops(struct rxe_qp *qp, struct rxe_send_wqe *wqe) { u8 opcode = wqe->wr.opcode; - struct rxe_mr *mr; u32 rkey; int ret;
@@ -590,14 +589,11 @@ static int rxe_do_local_ops(struct rxe_qp *qp, struct rxe_send_wqe *wqe) } break; case IB_WR_REG_MR: - mr = to_rmr(wqe->wr.wr.reg.mr); - rxe_add_ref(mr); - mr->state = RXE_MR_STATE_VALID; - mr->access = wqe->wr.wr.reg.access; - mr->ibmr.lkey = wqe->wr.wr.reg.key; - mr->ibmr.rkey = wqe->wr.wr.reg.key; - mr->iova = wqe->wr.wr.reg.mr->iova; - rxe_drop_ref(mr); + ret = rxe_reg_fast_mr(qp, wqe); + if (unlikely(ret)) { + wqe->status = IB_WC_LOC_QP_OP_ERR; + return ret; + } break; case IB_WR_BIND_MW: ret = rxe_bind_mw(qp, wqe); diff --git a/drivers/infiniband/sw/rxe/rxe_verbs.h b/drivers/infiniband/sw/rxe/rxe_verbs.h index ac2a2148027f4..d90b1d77de347 100644 --- a/drivers/infiniband/sw/rxe/rxe_verbs.h +++ b/drivers/infiniband/sw/rxe/rxe_verbs.h @@ -313,6 +313,8 @@ struct rxe_mr {
struct ib_umem *umem;
+ u32 lkey; + u32 rkey; enum rxe_mr_state state; enum rxe_mr_type type; u64 va; @@ -350,6 +352,7 @@ struct rxe_mw { enum rxe_mw_state state; struct rxe_qp *qp; /* Type 2 only */ struct rxe_mr *mr; + u32 rkey; int access; u64 addr; u64 length; @@ -474,26 +477,11 @@ static inline struct rxe_pd *mr_pd(struct rxe_mr *mr) return to_rpd(mr->ibmr.pd); }
-static inline u32 mr_lkey(struct rxe_mr *mr) -{ - return mr->ibmr.lkey; -} - -static inline u32 mr_rkey(struct rxe_mr *mr) -{ - return mr->ibmr.rkey; -} - static inline struct rxe_pd *rxe_mw_pd(struct rxe_mw *mw) { return to_rpd(mw->ibmw.pd); }
-static inline u32 rxe_mw_rkey(struct rxe_mw *mw) -{ - return mw->ibmw.rkey; -} - int rxe_register_device(struct rxe_dev *rxe, const char *ibdev_name);
void rxe_mc_cleanup(struct rxe_pool_entry *arg);