From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 6A3B7223302; Thu, 12 Dec 2024 17:11:42 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1734023502; cv=none; b=bhDkgZETaKoDlL9RYmpI4KCpLcKr0q6HQU3wsRDsplEfhweJ/FK+sxsl5XldPNAvXSw38VAzOOh5xqlYa8DPRM6kMiZBe+RDVjJKvaKBVCtOQmBTfIoa9WjUWmfLqvAYkMkgM3v/4LV3fWZFhsviJhWNY2FvOcuWuNXkSNKV/4E= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1734023502; c=relaxed/simple; bh=o5L2ZGXgv4GKcllwKCttSAIFGQFLbH7UeJQZ6oUeQxY=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=sAyYeqbIjkuqVsCzmgkRcqyZEC/dbXgyc6UZpONHuHy+62P3m5ghegAEbI63EuK28dRJDhOzwJI558Ea/ASJz4x+rdJe3JbEOdMZP3rVImantmSEnZT/ucO2OmzrJehmSjYuW98Xf5a7dvVDR+PCePvZD9xs6YFiUbI8oPLij74= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=z6wtVHmW; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="z6wtVHmW" Received: by smtp.kernel.org (Postfix) with ESMTPSA id E4CD1C4CED0; Thu, 12 Dec 2024 17:11:41 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1734023502; bh=o5L2ZGXgv4GKcllwKCttSAIFGQFLbH7UeJQZ6oUeQxY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=z6wtVHmWxlnI0+ELTBvycObBaHSFa1Dav/XVhDFzMRm8fhUj5UEr2wV7mw0KYu1oW 60Y0EVK0E+HHwLnfo+Dy+TX44FzpCzVwVRC9QUaqw1KBaL4BN/BqDybwLbH31Rh8Me QsXoa+bfcviqqemap1RRdsDIg6CAg0wqeoterYYU= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Ziwei Xiao , Jakub Kicinski , Praveen Kaligineedi Subject: [PATCH 5.15 555/565] gve: Fixes for napi_poll when budget is 0 Date: Thu, 12 Dec 2024 16:02:30 +0100 Message-ID: <20241212144333.800452202@linuxfoundation.org> X-Mailer: git-send-email 2.47.1 In-Reply-To: <20241212144311.432886635@linuxfoundation.org> References: <20241212144311.432886635@linuxfoundation.org> User-Agent: quilt/0.67 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 5.15-stable review patch. If anyone has any objections, please let me know. ------------------ From: Ziwei Xiao commit 278a370c1766060d2144d6cf0b06c101e1043b6d upstream. Netpoll will explicilty pass the polling call with a budget of 0 to indicate it's clearing the Tx path only. For the gve_rx_poll and gve_xdp_poll, they were mistakenly taking the 0 budget as the indication to do all the work. Add check to avoid the rx path and xdp path being called when budget is 0. And also avoid napi_complete_done being called when budget is 0 for netpoll. Fixes: f5cedc84a30d ("gve: Add transmit and receive support") Signed-off-by: Ziwei Xiao Link: https://lore.kernel.org/r/20231114004144.2022268-1-ziweixiao@google.com Signed-off-by: Jakub Kicinski Reviewed-by: Praveen Kaligineedi Signed-off-by: Praveen Kaligineedi Signed-off-by: Greg Kroah-Hartman --- drivers/net/ethernet/google/gve/gve_main.c | 7 +++++++ drivers/net/ethernet/google/gve/gve_rx.c | 4 ---- drivers/net/ethernet/google/gve/gve_tx.c | 4 ---- 3 files changed, 7 insertions(+), 8 deletions(-) --- a/drivers/net/ethernet/google/gve/gve_main.c +++ b/drivers/net/ethernet/google/gve/gve_main.c @@ -201,6 +201,10 @@ static int gve_napi_poll(struct napi_str if (block->tx) reschedule |= gve_tx_poll(block, budget); + + if (!budget) + return 0; + if (block->rx) reschedule |= gve_rx_poll(block, budget); @@ -236,6 +240,9 @@ static int gve_napi_poll_dqo(struct napi if (block->tx) reschedule |= gve_tx_poll_dqo(block, /*do_clean=*/true); + if (!budget) + return 0; + if (block->rx) { work_done = gve_rx_poll_dqo(block, budget); reschedule |= work_done == budget; --- a/drivers/net/ethernet/google/gve/gve_rx.c +++ b/drivers/net/ethernet/google/gve/gve_rx.c @@ -606,10 +606,6 @@ bool gve_rx_poll(struct gve_notify_block feat = block->napi.dev->features; - /* If budget is 0, do all the work */ - if (budget == 0) - budget = INT_MAX; - if (budget > 0) repoll |= gve_clean_rx_done(rx, budget, feat); else --- a/drivers/net/ethernet/google/gve/gve_tx.c +++ b/drivers/net/ethernet/google/gve/gve_tx.c @@ -686,10 +686,6 @@ bool gve_tx_poll(struct gve_notify_block u32 nic_done; u32 to_do; - /* If budget is 0, do all the work */ - if (budget == 0) - budget = INT_MAX; - /* Find out how much work there is to be done */ tx->last_nic_done = gve_tx_load_event_counter(priv, tx); nic_done = be32_to_cpu(tx->last_nic_done);