From: Yonatan Nachum Date: Wed, 10 Dec 2025 13:06:13 +0000 (+0000) Subject: RDMA/efa: Check stored completion CTX command ID with received one X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=4b01ec0f133b3fe1038dc538d6bfcbd72462d2f0;p=thirdparty%2Fkernel%2Flinux.git RDMA/efa: Check stored completion CTX command ID with received one In admin command completion, we receive a CQE with the command ID which is constructed from context index and entropy bits from the admin queue producer counter. To try to detect memory corruptions in the received CQE, validate the full command ID of the fetched context with the CQE command ID. If there is a mismatch, complete the CQE with error. Also use LSBs of the admin queue producer counter to better detect entropy mismatch between smaller number of commands. Reviewed-by: Daniel Kranzdorf Reviewed-by: Michael Margolin Signed-off-by: Yonatan Nachum Link: https://patch.msgid.link/20251210130614.36460-2-ynachum@amazon.com Signed-off-by: Leon Romanovsky --- diff --git a/drivers/infiniband/hw/efa/efa_com.c b/drivers/infiniband/hw/efa/efa_com.c index 0e979ca10d240..b31478f3a1212 100644 --- a/drivers/infiniband/hw/efa/efa_com.c +++ b/drivers/infiniband/hw/efa/efa_com.c @@ -3,6 +3,8 @@ * Copyright 2018-2025 Amazon.com, Inc. or its affiliates. All rights reserved. */ +#include + #include "efa_com.h" #include "efa_regs_defs.h" @@ -317,7 +319,7 @@ static struct efa_comp_ctx *__efa_com_submit_admin_cmd(struct efa_com_admin_queu /* cmd_id LSBs are the ctx_id and MSBs are entropy bits from pc */ cmd_id = ctx_id & queue_size_mask; - cmd_id |= aq->sq.pc & ~queue_size_mask; + cmd_id |= aq->sq.pc << ilog2(aq->depth); cmd_id &= EFA_ADMIN_AQ_COMMON_DESC_COMMAND_ID_MASK; cmd->aq_common_descriptor.command_id = cmd_id; @@ -418,7 +420,7 @@ static int efa_com_handle_single_admin_completion(struct efa_com_admin_queue *aq EFA_ADMIN_ACQ_COMMON_DESC_COMMAND_ID); comp_ctx = efa_com_get_comp_ctx(aq, cmd_id, false); - if (comp_ctx->status != EFA_CMD_SUBMITTED) { + if (comp_ctx->status != EFA_CMD_SUBMITTED || comp_ctx->cmd_id != cmd_id) { ibdev_err(aq->efa_dev, "Received completion with unexpected command id[%d], sq producer: %d, sq consumer: %d, cq consumer: %d\n", cmd_id, aq->sq.pc, aq->sq.cc, aq->cq.cc);