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Thu, 05 Nov 2026 14:21:07 -0800 (PST) Received: from localhost ([2a03:2880:9ff:6a::]) by smtp.gmail.com with ESMTPSA id a92af1059eb24-1b245c6f0dcsm26931436c88.21.2026.11.05.14.21.07 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 05 Nov 2026 14:21:07 -0800 (PST) From: Stanislav Fomichev X-Google-Original-From: Stanislav Fomichev To: netdev@vger.kernel.org Cc: davem@davemloft.net, edumazet@google.com, kuba@kernel.org, pabeni@redhat.com, andrew+netdev@lunn.ch, edumazet@kernel.org, horms@kernel.org, corbet@lwn.net, skhan@linuxfoundation.org, rdunlap@infradead.org, michael.chan@broadcom.com, pavan.chebbi@broadcom.com, saeedm@nvidia.com, tariqt@nvidia.com, mbloch@nvidia.com, alexanderduyck@fb.com, kernel-team@meta.com, sdf@fomichev.me, dimitri.daskalakis1@gmail.com, almasrymina@google.com, dtatulea@nvidia.com, bobbyeshleman@meta.com, asml.silence@gmail.com, daniel@iogearbox.net, razor@blackwall.org, leitao@debian.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-rdma@vger.kernel.org, linux-kselftest@vger.kernel.org, leon@kernel.org Subject: [PATCH net-next v3 6/9] eth: fbnic: set the netmem TX frag size limit to 32KB Date: Thu, 5 Nov 2026 14:20:55 -0800 Message-ID: <20261105222058.944293-7-sdf@fomichev.me> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20261105222058.944293-1-sdf@fomichev.me> References: <20261105222058.944293-1-sdf@fomichev.me> X-Mailing-List: netdev@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Transfer-Encoding: 8bit The TX descriptor length field (FBNIC_TWD_LEN_MASK) is 16 bits wide. Set the netmem TX frag size limit to the largest power of 2 which fits, like bnxt. With 64K pages this also lowers the PAGE_SIZE default, whose 64KB frags don't fit the length field. Signed-off-by: Stanislav Fomichev --- drivers/net/ethernet/meta/fbnic/fbnic_netdev.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/net/ethernet/meta/fbnic/fbnic_netdev.c b/drivers/net/ethernet/meta/fbnic/fbnic_netdev.c index 8a6703afca38..0a2b66202aec 100644 --- a/drivers/net/ethernet/meta/fbnic/fbnic_netdev.c +++ b/drivers/net/ethernet/meta/fbnic/fbnic_netdev.c @@ -760,6 +760,7 @@ struct net_device *fbnic_netdev_alloc(struct fbnic_dev *fbd) netdev->stat_ops = &fbnic_stat_ops; netdev->queue_mgmt_ops = &fbnic_queue_mgmt_ops; netdev->netmem_tx = NETMEM_TX_DMA; + netdev->netmem_tx_max_frag_size = SZ_32K; fbnic_set_ethtool_ops(netdev); -- 2.53.0-Meta