From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-pg1-x549.google.com (mail-pg1-x549.google.com [IPv6:2607:f8b0:4864:20::549]) by mail.toke.dk (Postfix) with ESMTPS id 2C216A406A2 for ; Mon, 27 Nov 2023 20:04:24 +0100 (CET) Authentication-Results: mail.toke.dk; dkim=pass (2048-bit key; unprotected) header.d=google.com header.i=@google.com header.a=rsa-sha256 header.s=20230601 header.b=ksqsY/8n Received: by mail-pg1-x549.google.com with SMTP id 41be03b00d2f7-5abf640f19aso5904428a12.2 for ; Mon, 27 Nov 2023 11:04:24 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1701111803; x=1701716603; darn=xdp-project.net; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:from:to:cc:subject:date:message-id:reply-to; bh=psXeWSFV9jNwPqAMO4arGwTup4UEtWfZR60Db4FTCc0=; b=ksqsY/8nUhsqGF7ptWx4cJkOsyV3ozFz5eQXKZDRvHrvycQ+rRDQ8BoKxfsgiTR7KZ 0s76o9+T0qsxG7H1ZpDkYdOcjt1fhODKAPZmqiCZRQcu6skAhZYuNwsPCGa2vfI96X61 zS3TAfNssXboEt2wI79xR0eOLQes1V+0ehDJWu3g9XHIzF1AIFrVV+8IQyGuDI+Ul75G hIvoLjt2Xg7C3x7b4xi2Z7OFU1UunTpa1InhOqH6hvteSepr4QncQrSKiny7imU+QHbg CB10U1aIPeGGEWT8WppGfmjDq1A/NQRIqk9i2cq+xs71mqSOeITK9IQH/WYkmdvVRMK1 kotg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1701111803; x=1701716603; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=psXeWSFV9jNwPqAMO4arGwTup4UEtWfZR60Db4FTCc0=; b=pbfZT9R+UX7nIyTYeC4liCNBZwE70MOl6mwEqHtOrOHuYlQmnjyauX1TznmuzdM4gU Ni9yDqog/VEM6HMHOqLjxnBcrISNLLuGQHvqlHMKGSodWvlJIxgSTOjJk9Ge3Pw3/mQa Grxi6xBnF1iJACAcQIgRtPHlKmG3Y0EmH953rs+muowxbdRjm3Fhepfw/McA4IdHAGMz 3eOGapOCNFsHb3iGCQyn3vDkLz8bjv+81stu4uZrcraiXPgVXgHvM10VV7b7b8q9sDb7 tUJR8E5umcwK2T823RDRX5UIrh5ygRPqm/rAXyK+OnuQfnX5vCtDrBKwre6eFbGa/FXj VT5w== X-Gm-Message-State: AOJu0YyUJD3twb3RqKO5zXOKjeHcu2t/DUxfgCgAr9GShRdphyV7nlq0 txrttnl2vV+GgcdYHjKxZBcNXZY= X-Google-Smtp-Source: AGHT+IGmlmDeKoqQIpCdZIz5m+tgvYQiWdhiP3RR3TZ9IiHLEWD4GuSk6K4vRAEBjui7lE/Ujmo5mQ8= X-Received: from sdf.c.googlers.com ([fda3:e722:ac3:cc00:7f:e700:c0a8:5935]) (user=sdf job=sendgmr) by 2002:a63:d209:0:b0:5be:1194:9c0b with SMTP id a9-20020a63d209000000b005be11949c0bmr2068487pgg.3.1701111802937; Mon, 27 Nov 2023 11:03:22 -0800 (PST) Date: Mon, 27 Nov 2023 11:03:07 -0800 In-Reply-To: <20231127190319.1190813-1-sdf@google.com> Mime-Version: 1.0 References: <20231127190319.1190813-1-sdf@google.com> X-Mailer: git-send-email 2.43.0.rc1.413.gea7ed67945-goog Message-ID: <20231127190319.1190813-2-sdf@google.com> From: Stanislav Fomichev To: bpf@vger.kernel.org Content-Type: text/plain; charset="UTF-8" Message-ID-Hash: EVL6D75CHPARNGAC2ATFIXKFNYEH3NNI X-Message-ID-Hash: EVL6D75CHPARNGAC2ATFIXKFNYEH3NNI X-MailFrom: 3-udkZQMKCY8Bwyz77z4x.v75Gw8-016CBGw8-8A72xvC.6xC@flex--sdf.bounces.google.com X-Mailman-Rule-Misses: dmarc-mitigation; no-senders; approved; emergency; loop; banned-address; member-moderation; nonmember-moderation; administrivia; implicit-dest; max-recipients; max-size; news-moderation; no-subject; digests; suspicious-header CC: ast@kernel.org, daniel@iogearbox.net, andrii@kernel.org, martin.lau@linux.dev, song@kernel.org, yhs@fb.com, john.fastabend@gmail.com, kpsingh@kernel.org, sdf@google.com, haoluo@google.com, jolsa@kernel.org, kuba@kernel.org, toke@kernel.org, willemb@google.com, dsahern@kernel.org, magnus.karlsson@intel.com, bjorn@kernel.org, maciej.fijalkowski@intel.com, hawk@kernel.org, yoong.siang.song@intel.com, netdev@vger.kernel.org, xdp-hints@xdp-project.net X-Mailman-Version: 3.3.8 Precedence: list Subject: [xdp-hints] [PATCH bpf-next v6 01/13] xsk: Support tx_metadata_len List-Id: XDP hardware hints design discussion Archived-At: List-Archive: List-Help: List-Owner: List-Post: List-Subscribe: List-Unsubscribe: For zerocopy mode, tx_desc->addr can point to an arbitrary offset and carry some TX metadata in the headroom. For copy mode, there is no way currently to populate skb metadata. Introduce new tx_metadata_len umem config option that indicates how many bytes to treat as metadata. Metadata bytes come prior to tx_desc address (same as in RX case). The size of the metadata has mostly the same constraints as XDP: - less than 256 bytes - 8-byte aligned (compared to 4-byte alignment on xdp, due to 8-byte timestamp in the completion) - non-zero This data is not interpreted in any way right now. Reviewed-by: Song Yoong Siang Signed-off-by: Stanislav Fomichev --- include/net/xdp_sock.h | 1 + include/net/xsk_buff_pool.h | 1 + include/uapi/linux/if_xdp.h | 1 + net/xdp/xdp_umem.c | 4 ++++ net/xdp/xsk.c | 12 +++++++++++- net/xdp/xsk_buff_pool.c | 1 + net/xdp/xsk_queue.h | 17 ++++++++++------- tools/include/uapi/linux/if_xdp.h | 1 + 8 files changed, 30 insertions(+), 8 deletions(-) diff --git a/include/net/xdp_sock.h b/include/net/xdp_sock.h index f83128007fb0..bcf765124f72 100644 --- a/include/net/xdp_sock.h +++ b/include/net/xdp_sock.h @@ -30,6 +30,7 @@ struct xdp_umem { struct user_struct *user; refcount_t users; u8 flags; + u8 tx_metadata_len; bool zc; struct page **pgs; int id; diff --git a/include/net/xsk_buff_pool.h b/include/net/xsk_buff_pool.h index b0bdff26fc88..1985ffaf9b0c 100644 --- a/include/net/xsk_buff_pool.h +++ b/include/net/xsk_buff_pool.h @@ -77,6 +77,7 @@ struct xsk_buff_pool { u32 chunk_size; u32 chunk_shift; u32 frame_len; + u8 tx_metadata_len; /* inherited from umem */ u8 cached_need_wakeup; bool uses_need_wakeup; bool dma_need_sync; diff --git a/include/uapi/linux/if_xdp.h b/include/uapi/linux/if_xdp.h index 8d48863472b9..2ecf79282c26 100644 --- a/include/uapi/linux/if_xdp.h +++ b/include/uapi/linux/if_xdp.h @@ -76,6 +76,7 @@ struct xdp_umem_reg { __u32 chunk_size; __u32 headroom; __u32 flags; + __u32 tx_metadata_len; }; struct xdp_statistics { diff --git a/net/xdp/xdp_umem.c b/net/xdp/xdp_umem.c index 06cead2b8e34..946a687fb8e8 100644 --- a/net/xdp/xdp_umem.c +++ b/net/xdp/xdp_umem.c @@ -199,6 +199,9 @@ static int xdp_umem_reg(struct xdp_umem *umem, struct xdp_umem_reg *mr) if (headroom >= chunk_size - XDP_PACKET_HEADROOM) return -EINVAL; + if (mr->tx_metadata_len >= 256 || mr->tx_metadata_len % 8) + return -EINVAL; + umem->size = size; umem->headroom = headroom; umem->chunk_size = chunk_size; @@ -207,6 +210,7 @@ static int xdp_umem_reg(struct xdp_umem *umem, struct xdp_umem_reg *mr) umem->pgs = NULL; umem->user = NULL; umem->flags = mr->flags; + umem->tx_metadata_len = mr->tx_metadata_len; INIT_LIST_HEAD(&umem->xsk_dma_list); refcount_set(&umem->users, 1); diff --git a/net/xdp/xsk.c b/net/xdp/xsk.c index ae9f8cb611f6..c904356e2800 100644 --- a/net/xdp/xsk.c +++ b/net/xdp/xsk.c @@ -1283,6 +1283,14 @@ struct xdp_umem_reg_v1 { __u32 headroom; }; +struct xdp_umem_reg_v2 { + __u64 addr; /* Start of packet data area */ + __u64 len; /* Length of packet data area */ + __u32 chunk_size; + __u32 headroom; + __u32 flags; +}; + static int xsk_setsockopt(struct socket *sock, int level, int optname, sockptr_t optval, unsigned int optlen) { @@ -1326,8 +1334,10 @@ static int xsk_setsockopt(struct socket *sock, int level, int optname, if (optlen < sizeof(struct xdp_umem_reg_v1)) return -EINVAL; - else if (optlen < sizeof(mr)) + else if (optlen < sizeof(struct xdp_umem_reg_v2)) mr_size = sizeof(struct xdp_umem_reg_v1); + else if (optlen < sizeof(mr)) + mr_size = sizeof(struct xdp_umem_reg_v2); if (copy_from_sockptr(&mr, optval, mr_size)) return -EFAULT; diff --git a/net/xdp/xsk_buff_pool.c b/net/xdp/xsk_buff_pool.c index 49cb9f9a09be..386eddcdf837 100644 --- a/net/xdp/xsk_buff_pool.c +++ b/net/xdp/xsk_buff_pool.c @@ -85,6 +85,7 @@ struct xsk_buff_pool *xp_create_and_assign_umem(struct xdp_sock *xs, XDP_PACKET_HEADROOM; pool->umem = umem; pool->addrs = umem->addrs; + pool->tx_metadata_len = umem->tx_metadata_len; INIT_LIST_HEAD(&pool->free_list); INIT_LIST_HEAD(&pool->xskb_list); INIT_LIST_HEAD(&pool->xsk_tx_list); diff --git a/net/xdp/xsk_queue.h b/net/xdp/xsk_queue.h index 13354a1e4280..c74a1372bcb9 100644 --- a/net/xdp/xsk_queue.h +++ b/net/xdp/xsk_queue.h @@ -143,15 +143,17 @@ static inline bool xp_unused_options_set(u32 options) static inline bool xp_aligned_validate_desc(struct xsk_buff_pool *pool, struct xdp_desc *desc) { - u64 offset = desc->addr & (pool->chunk_size - 1); + u64 addr = desc->addr - pool->tx_metadata_len; + u64 len = desc->len + pool->tx_metadata_len; + u64 offset = addr & (pool->chunk_size - 1); if (!desc->len) return false; - if (offset + desc->len > pool->chunk_size) + if (offset + len > pool->chunk_size) return false; - if (desc->addr >= pool->addrs_cnt) + if (addr >= pool->addrs_cnt) return false; if (xp_unused_options_set(desc->options)) @@ -162,16 +164,17 @@ static inline bool xp_aligned_validate_desc(struct xsk_buff_pool *pool, static inline bool xp_unaligned_validate_desc(struct xsk_buff_pool *pool, struct xdp_desc *desc) { - u64 addr = xp_unaligned_add_offset_to_addr(desc->addr); + u64 addr = xp_unaligned_add_offset_to_addr(desc->addr) - pool->tx_metadata_len; + u64 len = desc->len + pool->tx_metadata_len; if (!desc->len) return false; - if (desc->len > pool->chunk_size) + if (len > pool->chunk_size) return false; - if (addr >= pool->addrs_cnt || addr + desc->len > pool->addrs_cnt || - xp_desc_crosses_non_contig_pg(pool, addr, desc->len)) + if (addr >= pool->addrs_cnt || addr + len > pool->addrs_cnt || + xp_desc_crosses_non_contig_pg(pool, addr, len)) return false; if (xp_unused_options_set(desc->options)) diff --git a/tools/include/uapi/linux/if_xdp.h b/tools/include/uapi/linux/if_xdp.h index 73a47da885dc..34411a2e5b6c 100644 --- a/tools/include/uapi/linux/if_xdp.h +++ b/tools/include/uapi/linux/if_xdp.h @@ -76,6 +76,7 @@ struct xdp_umem_reg { __u32 chunk_size; __u32 headroom; __u32 flags; + __u32 tx_metadata_len; }; struct xdp_statistics { -- 2.43.0.rc1.413.gea7ed67945-goog