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Szmigiero" , Fabiano Rosas , Peter Xu , =?UTF-8?q?C=C3=A9dric=20Le=20Goater?= Subject: [PULL 19/42] migration/multifd: Split packet into header and RAM data Date: Thu, 6 Mar 2025 15:13:55 +0100 Message-ID: <20250306141419.2015340-20-clg@redhat.com> In-Reply-To: <20250306141419.2015340-1-clg@redhat.com> References: <20250306141419.2015340-1-clg@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-Scanned-By: MIMEDefang 3.4.1 on 10.30.177.111 Received-SPF: pass client-ip=170.10.133.124; envelope-from=clg@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H2=0.001, RCVD_IN_VALIDITY_RPBL_BLOCKED=0.001, RCVD_IN_VALIDITY_SAFE_BLOCKED=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org From: "Maciej S. Szmigiero" Read packet header first so in the future we will be able to differentiate between a RAM multifd packet and a device state multifd packet. Since these two are of different size we can't read the packet body until we know which packet type it is. Reviewed-by: Fabiano Rosas Reviewed-by: Peter Xu Signed-off-by: Maciej S. Szmigiero Link: https://lore.kernel.org/qemu-devel/832ad055fe447561ac1ad565d61658660cb3f63f.1741124640.git.maciej.szmigiero@oracle.com Signed-off-by: Cédric Le Goater --- migration/multifd.h | 5 +++++ migration/multifd.c | 55 ++++++++++++++++++++++++++++++++++++--------- 2 files changed, 49 insertions(+), 11 deletions(-) diff --git a/migration/multifd.h b/migration/multifd.h index cf408ff72140a51fef7bdfc90ba11044992cfd2e..f7156f66c0f6b3872c12af7ccdab55806509fac2 100644 --- a/migration/multifd.h +++ b/migration/multifd.h @@ -69,6 +69,11 @@ typedef struct { uint32_t magic; uint32_t version; uint32_t flags; +} __attribute__((packed)) MultiFDPacketHdr_t; + +typedef struct { + MultiFDPacketHdr_t hdr; + /* maximum number of allocated pages */ uint32_t pages_alloc; /* non zero pages */ diff --git a/migration/multifd.c b/migration/multifd.c index 215ad0414a799cfb389c501331de5e505600905d..3b47e63c2c4a6a65751b4eb4e9501a443695ff8f 100644 --- a/migration/multifd.c +++ b/migration/multifd.c @@ -209,10 +209,10 @@ void multifd_send_fill_packet(MultiFDSendParams *p) memset(packet, 0, p->packet_len); - packet->magic = cpu_to_be32(MULTIFD_MAGIC); - packet->version = cpu_to_be32(MULTIFD_VERSION); + packet->hdr.magic = cpu_to_be32(MULTIFD_MAGIC); + packet->hdr.version = cpu_to_be32(MULTIFD_VERSION); - packet->flags = cpu_to_be32(p->flags); + packet->hdr.flags = cpu_to_be32(p->flags); packet->next_packet_size = cpu_to_be32(p->next_packet_size); packet_num = qatomic_fetch_inc(&multifd_send_state->packet_num); @@ -228,12 +228,12 @@ void multifd_send_fill_packet(MultiFDSendParams *p) p->flags, p->next_packet_size); } -static int multifd_recv_unfill_packet(MultiFDRecvParams *p, Error **errp) +static int multifd_recv_unfill_packet_header(MultiFDRecvParams *p, + const MultiFDPacketHdr_t *hdr, + Error **errp) { - const MultiFDPacket_t *packet = p->packet; - uint32_t magic = be32_to_cpu(packet->magic); - uint32_t version = be32_to_cpu(packet->version); - int ret = 0; + uint32_t magic = be32_to_cpu(hdr->magic); + uint32_t version = be32_to_cpu(hdr->version); if (magic != MULTIFD_MAGIC) { error_setg(errp, "multifd: received packet magic %x, expected %x", @@ -247,7 +247,16 @@ static int multifd_recv_unfill_packet(MultiFDRecvParams *p, Error **errp) return -1; } - p->flags = be32_to_cpu(packet->flags); + p->flags = be32_to_cpu(hdr->flags); + + return 0; +} + +static int multifd_recv_unfill_packet(MultiFDRecvParams *p, Error **errp) +{ + const MultiFDPacket_t *packet = p->packet; + int ret = 0; + p->next_packet_size = be32_to_cpu(packet->next_packet_size); p->packet_num = be64_to_cpu(packet->packet_num); p->packets_recved++; @@ -1165,14 +1174,18 @@ static void *multifd_recv_thread(void *opaque) } while (true) { + MultiFDPacketHdr_t hdr; uint32_t flags = 0; bool has_data = false; + uint8_t *pkt_buf; + size_t pkt_len; + p->normal_num = 0; if (use_packets) { struct iovec iov = { - .iov_base = (void *)p->packet, - .iov_len = p->packet_len + .iov_base = (void *)&hdr, + .iov_len = sizeof(hdr) }; if (multifd_recv_should_exit()) { @@ -1191,6 +1204,26 @@ static void *multifd_recv_thread(void *opaque) break; } + ret = multifd_recv_unfill_packet_header(p, &hdr, &local_err); + if (ret) { + break; + } + + pkt_buf = (uint8_t *)p->packet + sizeof(hdr); + pkt_len = p->packet_len - sizeof(hdr); + + ret = qio_channel_read_all_eof(p->c, (char *)pkt_buf, pkt_len, + &local_err); + if (!ret) { + /* EOF */ + error_setg(&local_err, "multifd: unexpected EOF after packet header"); + break; + } + + if (ret == -1) { + break; + } + qemu_mutex_lock(&p->mutex); ret = multifd_recv_unfill_packet(p, &local_err); if (ret) { -- 2.48.1