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Tue, 12 May 2026 13:14:58 -0700 (PDT) From: Liibaan Egal To: linux-rdma@vger.kernel.org Cc: zyjzyj2000@gmail.com, jgg@ziepe.ca, leon@kernel.org, linux-kernel@vger.kernel.org Subject: [RFC PATCH rdma-next 2/2] RDMA/rxe: advertise IB_ODP_SUPPORT_IMPLICIT for local access Date: Tue, 12 May 2026 15:14:53 -0500 Message-Id: <20260512201453.21156-3-liibaegal@gmail.com> X-Mailer: git-send-email 2.39.5 (Apple Git-154) In-Reply-To: <20260512201453.21156-1-liibaegal@gmail.com> References: <20260512201453.21156-1-liibaegal@gmail.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Now that the implicit ODP registration and local SGE fault paths are in place, advertise IB_ODP_SUPPORT_IMPLICIT in general_odp_caps so userspace can probe the support via ibv_query_device. The advertised support is intentionally scoped to local access: remote rkey access on implicit MRs is rejected at registration time, and the atomic, flush, and atomic-write paths reject implicit MRs at the top of each helper. Question for reviewers: is IB_ODP_SUPPORT_IMPLICIT the right capability bit to advertise for this local-access-only operation matrix, or should capability exposure wait for broader operation coverage? The cap-flip is kept in its own patch so the policy decision is separable from the implementation. Signed-off-by: Liibaan Egal --- drivers/infiniband/sw/rxe/rxe.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) diff --git a/drivers/infiniband/sw/rxe/rxe.c b/drivers/infiniband/sw/rxe/rxe.c index b0714f9abe..581313591d 100644 --- a/drivers/infiniband/sw/rxe/rxe.c +++ b/drivers/infiniband/sw/rxe/rxe.c @@ -94,8 +94,13 @@ static void rxe_init_device_param(struct rxe_dev *rxe, struct net_device *ndev) if (IS_ENABLED(CONFIG_INFINIBAND_ON_DEMAND_PAGING)) { rxe->attr.kernel_cap_flags |= IBK_ON_DEMAND_PAGING; - /* IB_ODP_SUPPORT_IMPLICIT is not supported right now. */ rxe->attr.odp_caps.general_caps |= IB_ODP_SUPPORT; + /* IMPLICIT is gated to the local-access subset. The fault path + * in rxe_odp.c rejects remote-access implicit forms at + * registration time. Per-transport caps below stay unchanged: + * they describe explicit ODP MR semantics and remain accurate. + */ + rxe->attr.odp_caps.general_caps |= IB_ODP_SUPPORT_IMPLICIT; rxe->attr.odp_caps.per_transport_caps.ud_odp_caps |= IB_ODP_SUPPORT_SEND; rxe->attr.odp_caps.per_transport_caps.ud_odp_caps |= IB_ODP_SUPPORT_RECV; -- 2.43.0