| Message ID | 20240722175914.24022-8-farosas@suse.de |
|---|---|
| State | New |
| Headers | show |
| Series | migration/multifd: Remove multifd_send_state->pages | expand |
On Mon, Jul 22, 2024 at 02:59:12PM -0300, Fabiano Rosas wrote: > While we cannot yet disentangle the multifd packet from page data, we > can make the code a bit cleaner by setting the page-related fields in > a separate function. > > Signed-off-by: Fabiano Rosas <farosas@suse.de> > --- > migration/multifd.c | 97 ++++++++++++++++++++++++++++----------------- > 1 file changed, 61 insertions(+), 36 deletions(-) > > diff --git a/migration/multifd.c b/migration/multifd.c > index fcdb12e04f..d25b8658b2 100644 > --- a/migration/multifd.c > +++ b/migration/multifd.c > @@ -409,65 +409,62 @@ static int multifd_recv_initial_packet(QIOChannel *c, Error **errp) > return msg.id; > } > > -void multifd_send_fill_packet(MultiFDSendParams *p) > +static void multifd_ram_fill_packet(MultiFDSendParams *p) > { > MultiFDPacket_t *packet = p->packet; > MultiFDPages_t *pages = &p->data->u.ram; > - uint64_t packet_num; > uint32_t zero_num = pages->num - pages->normal_num; > - int i; > > - packet->flags = cpu_to_be32(p->flags); > packet->pages_alloc = cpu_to_be32(pages->allocated); > packet->normal_pages = cpu_to_be32(pages->normal_num); > packet->zero_pages = cpu_to_be32(zero_num); > - packet->next_packet_size = cpu_to_be32(p->next_packet_size); Definitely good intention, but I had a feeling that this will need to be reorganized again when Maciej reworks on top, due to the fact that next_packet_size will be ram-private field, simply because it's defined after pages_alloc and normal_pages... E.g., see: https://lore.kernel.org/r/41dedaf2c9abebb5e45f88c052daa26320715a92.1718717584.git.maciej.szmigiero@oracle.com Where the new MultiFDPacketHdr_t cannot include next_packet_size (even if VFIO will need that too..). typedef struct { uint32_t magic; uint32_t version; uint32_t flags; } __attribute__((packed)) MultiFDPacketHdr_t; So _maybe_ it's easier we drop this patch and leave that part to Maciej to identify which is common and which is arm/vfio specific. No strong opinions here. > - > - packet_num = qatomic_fetch_inc(&multifd_send_state->packet_num); > - packet->packet_num = cpu_to_be64(packet_num); > > if (pages->block) { > strncpy(packet->ramblock, pages->block->idstr, 256); > } > > - for (i = 0; i < pages->num; i++) { > + for (int i = 0; i < pages->num; i++) { > /* there are architectures where ram_addr_t is 32 bit */ > uint64_t temp = pages->offset[i]; > > packet->offset[i] = cpu_to_be64(temp); > } > > - p->packets_sent++; > p->total_normal_pages += pages->normal_num; > p->total_zero_pages += zero_num; > +} > > - trace_multifd_send(p->id, packet_num, pages->normal_num, zero_num, > +void multifd_send_fill_packet(MultiFDSendParams *p) > +{ > + MultiFDPacket_t *packet = p->packet; > + uint64_t packet_num; > + > + memset(packet, 0, p->packet_len); > + > + packet->magic = cpu_to_be32(MULTIFD_MAGIC); > + packet->version = cpu_to_be32(MULTIFD_VERSION); > + > + packet->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); > + packet->packet_num = cpu_to_be64(packet_num); > + > + p->packets_sent++; > + > + multifd_ram_fill_packet(p); > + > + trace_multifd_send(p->id, packet_num, > + be32_to_cpu(packet->normal_pages), > + be32_to_cpu(packet->zero_pages), > p->flags, p->next_packet_size); > } > > -static int multifd_recv_unfill_packet(MultiFDRecvParams *p, Error **errp) > +static int multifd_ram_unfill_packet(MultiFDRecvParams *p, Error **errp) > { > MultiFDPacket_t *packet = p->packet; > int i; > > - packet->magic = be32_to_cpu(packet->magic); > - if (packet->magic != MULTIFD_MAGIC) { > - error_setg(errp, "multifd: received packet " > - "magic %x and expected magic %x", > - packet->magic, MULTIFD_MAGIC); > - return -1; > - } > - > - packet->version = be32_to_cpu(packet->version); > - if (packet->version != MULTIFD_VERSION) { > - error_setg(errp, "multifd: received packet " > - "version %u and expected version %u", > - packet->version, MULTIFD_VERSION); > - return -1; > - } > - > - p->flags = be32_to_cpu(packet->flags); > - > packet->pages_alloc = be32_to_cpu(packet->pages_alloc); > /* > * If we received a packet that is 100 times bigger than expected > @@ -496,15 +493,9 @@ static int multifd_recv_unfill_packet(MultiFDRecvParams *p, Error **errp) > return -1; > } > > - p->next_packet_size = be32_to_cpu(packet->next_packet_size); > - p->packet_num = be64_to_cpu(packet->packet_num); > - p->packets_recved++; > p->total_normal_pages += p->normal_num; > p->total_zero_pages += p->zero_num; > > - trace_multifd_recv(p->id, p->packet_num, p->normal_num, p->zero_num, > - p->flags, p->next_packet_size); > - > if (p->normal_num == 0 && p->zero_num == 0) { > return 0; > } > @@ -546,6 +537,40 @@ static int multifd_recv_unfill_packet(MultiFDRecvParams *p, Error **errp) > return 0; > } > > +static int multifd_recv_unfill_packet(MultiFDRecvParams *p, Error **errp) > +{ > + MultiFDPacket_t *packet = p->packet; > + int ret = 0; > + > + packet->magic = be32_to_cpu(packet->magic); > + if (packet->magic != MULTIFD_MAGIC) { > + error_setg(errp, "multifd: received packet " > + "magic %x and expected magic %x", > + packet->magic, MULTIFD_MAGIC); > + return -1; > + } > + > + packet->version = be32_to_cpu(packet->version); > + if (packet->version != MULTIFD_VERSION) { > + error_setg(errp, "multifd: received packet " > + "version %u and expected version %u", > + packet->version, MULTIFD_VERSION); > + return -1; > + } > + > + p->flags = be32_to_cpu(packet->flags); > + p->next_packet_size = be32_to_cpu(packet->next_packet_size); > + p->packet_num = be64_to_cpu(packet->packet_num); > + p->packets_recved++; > + > + ret = multifd_ram_unfill_packet(p, errp); > + > + trace_multifd_recv(p->id, p->packet_num, p->normal_num, p->zero_num, > + p->flags, p->next_packet_size); > + > + return ret; > +} > + > static bool multifd_send_should_exit(void) > { > return qatomic_read(&multifd_send_state->exiting); > -- > 2.35.3 >
Peter Xu <peterx@redhat.com> writes: > On Mon, Jul 22, 2024 at 02:59:12PM -0300, Fabiano Rosas wrote: >> While we cannot yet disentangle the multifd packet from page data, we >> can make the code a bit cleaner by setting the page-related fields in >> a separate function. >> >> Signed-off-by: Fabiano Rosas <farosas@suse.de> >> --- >> migration/multifd.c | 97 ++++++++++++++++++++++++++++----------------- >> 1 file changed, 61 insertions(+), 36 deletions(-) >> >> diff --git a/migration/multifd.c b/migration/multifd.c >> index fcdb12e04f..d25b8658b2 100644 >> --- a/migration/multifd.c >> +++ b/migration/multifd.c >> @@ -409,65 +409,62 @@ static int multifd_recv_initial_packet(QIOChannel *c, Error **errp) >> return msg.id; >> } >> >> -void multifd_send_fill_packet(MultiFDSendParams *p) >> +static void multifd_ram_fill_packet(MultiFDSendParams *p) >> { >> MultiFDPacket_t *packet = p->packet; >> MultiFDPages_t *pages = &p->data->u.ram; >> - uint64_t packet_num; >> uint32_t zero_num = pages->num - pages->normal_num; >> - int i; >> >> - packet->flags = cpu_to_be32(p->flags); >> packet->pages_alloc = cpu_to_be32(pages->allocated); >> packet->normal_pages = cpu_to_be32(pages->normal_num); >> packet->zero_pages = cpu_to_be32(zero_num); >> - packet->next_packet_size = cpu_to_be32(p->next_packet_size); > > Definitely good intention, but I had a feeling that this will need to be > reorganized again when Maciej reworks on top, due to the fact that > next_packet_size will be ram-private field, simply because it's defined > after pages_alloc and normal_pages... > > E.g., see: > > https://lore.kernel.org/r/41dedaf2c9abebb5e45f88c052daa26320715a92.1718717584.git.maciej.szmigiero@oracle.com > > Where the new MultiFDPacketHdr_t cannot include next_packet_size (even if > VFIO will need that too..). Isn't it just a matter of setting next_packet_size in the other path as well? @Maciej, can you comment? > > typedef struct { > uint32_t magic; > uint32_t version; > uint32_t flags; > } __attribute__((packed)) MultiFDPacketHdr_t; > > So _maybe_ it's easier we drop this patch and leave that part to Maciej to > identify which is common and which is arm/vfio specific. No strong > opinions here. > I could drop it if that's preferrable. However, patch 8/9 is absolutely necessary so we can remove this madness of having to clear MultiFDPages_t fields at the multifd_send_thread() top level. It took me a whole day to figure that one out and that bug has been manifesting ever since I started working on multifd. I'm not sure how we'll do that without this patch. Maybe it's better I fix in this one whatever you guys think needs fixing. >> - >> - packet_num = qatomic_fetch_inc(&multifd_send_state->packet_num); >> - packet->packet_num = cpu_to_be64(packet_num); >> >> if (pages->block) { >> strncpy(packet->ramblock, pages->block->idstr, 256); >> } >> >> - for (i = 0; i < pages->num; i++) { >> + for (int i = 0; i < pages->num; i++) { >> /* there are architectures where ram_addr_t is 32 bit */ >> uint64_t temp = pages->offset[i]; >> >> packet->offset[i] = cpu_to_be64(temp); >> } >> >> - p->packets_sent++; >> p->total_normal_pages += pages->normal_num; >> p->total_zero_pages += zero_num; >> +} >> >> - trace_multifd_send(p->id, packet_num, pages->normal_num, zero_num, >> +void multifd_send_fill_packet(MultiFDSendParams *p) >> +{ >> + MultiFDPacket_t *packet = p->packet; >> + uint64_t packet_num; >> + >> + memset(packet, 0, p->packet_len); >> + >> + packet->magic = cpu_to_be32(MULTIFD_MAGIC); >> + packet->version = cpu_to_be32(MULTIFD_VERSION); >> + >> + packet->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); >> + packet->packet_num = cpu_to_be64(packet_num); >> + >> + p->packets_sent++; >> + >> + multifd_ram_fill_packet(p); >> + >> + trace_multifd_send(p->id, packet_num, >> + be32_to_cpu(packet->normal_pages), >> + be32_to_cpu(packet->zero_pages), >> p->flags, p->next_packet_size); >> } >> >> -static int multifd_recv_unfill_packet(MultiFDRecvParams *p, Error **errp) >> +static int multifd_ram_unfill_packet(MultiFDRecvParams *p, Error **errp) >> { >> MultiFDPacket_t *packet = p->packet; >> int i; >> >> - packet->magic = be32_to_cpu(packet->magic); >> - if (packet->magic != MULTIFD_MAGIC) { >> - error_setg(errp, "multifd: received packet " >> - "magic %x and expected magic %x", >> - packet->magic, MULTIFD_MAGIC); >> - return -1; >> - } >> - >> - packet->version = be32_to_cpu(packet->version); >> - if (packet->version != MULTIFD_VERSION) { >> - error_setg(errp, "multifd: received packet " >> - "version %u and expected version %u", >> - packet->version, MULTIFD_VERSION); >> - return -1; >> - } >> - >> - p->flags = be32_to_cpu(packet->flags); >> - >> packet->pages_alloc = be32_to_cpu(packet->pages_alloc); >> /* >> * If we received a packet that is 100 times bigger than expected >> @@ -496,15 +493,9 @@ static int multifd_recv_unfill_packet(MultiFDRecvParams *p, Error **errp) >> return -1; >> } >> >> - p->next_packet_size = be32_to_cpu(packet->next_packet_size); >> - p->packet_num = be64_to_cpu(packet->packet_num); >> - p->packets_recved++; >> p->total_normal_pages += p->normal_num; >> p->total_zero_pages += p->zero_num; >> >> - trace_multifd_recv(p->id, p->packet_num, p->normal_num, p->zero_num, >> - p->flags, p->next_packet_size); >> - >> if (p->normal_num == 0 && p->zero_num == 0) { >> return 0; >> } >> @@ -546,6 +537,40 @@ static int multifd_recv_unfill_packet(MultiFDRecvParams *p, Error **errp) >> return 0; >> } >> >> +static int multifd_recv_unfill_packet(MultiFDRecvParams *p, Error **errp) >> +{ >> + MultiFDPacket_t *packet = p->packet; >> + int ret = 0; >> + >> + packet->magic = be32_to_cpu(packet->magic); >> + if (packet->magic != MULTIFD_MAGIC) { >> + error_setg(errp, "multifd: received packet " >> + "magic %x and expected magic %x", >> + packet->magic, MULTIFD_MAGIC); >> + return -1; >> + } >> + >> + packet->version = be32_to_cpu(packet->version); >> + if (packet->version != MULTIFD_VERSION) { >> + error_setg(errp, "multifd: received packet " >> + "version %u and expected version %u", >> + packet->version, MULTIFD_VERSION); >> + return -1; >> + } >> + >> + p->flags = be32_to_cpu(packet->flags); >> + p->next_packet_size = be32_to_cpu(packet->next_packet_size); >> + p->packet_num = be64_to_cpu(packet->packet_num); >> + p->packets_recved++; >> + >> + ret = multifd_ram_unfill_packet(p, errp); >> + >> + trace_multifd_recv(p->id, p->packet_num, p->normal_num, p->zero_num, >> + p->flags, p->next_packet_size); >> + >> + return ret; >> +} >> + >> static bool multifd_send_should_exit(void) >> { >> return qatomic_read(&multifd_send_state->exiting); >> -- >> 2.35.3 >>
On Mon, Jul 22, 2024 at 05:34:44PM -0300, Fabiano Rosas wrote: > Peter Xu <peterx@redhat.com> writes: > > > On Mon, Jul 22, 2024 at 02:59:12PM -0300, Fabiano Rosas wrote: > >> While we cannot yet disentangle the multifd packet from page data, we > >> can make the code a bit cleaner by setting the page-related fields in > >> a separate function. > >> > >> Signed-off-by: Fabiano Rosas <farosas@suse.de> > >> --- > >> migration/multifd.c | 97 ++++++++++++++++++++++++++++----------------- > >> 1 file changed, 61 insertions(+), 36 deletions(-) > >> > >> diff --git a/migration/multifd.c b/migration/multifd.c > >> index fcdb12e04f..d25b8658b2 100644 > >> --- a/migration/multifd.c > >> +++ b/migration/multifd.c > >> @@ -409,65 +409,62 @@ static int multifd_recv_initial_packet(QIOChannel *c, Error **errp) > >> return msg.id; > >> } > >> > >> -void multifd_send_fill_packet(MultiFDSendParams *p) > >> +static void multifd_ram_fill_packet(MultiFDSendParams *p) > >> { > >> MultiFDPacket_t *packet = p->packet; > >> MultiFDPages_t *pages = &p->data->u.ram; > >> - uint64_t packet_num; > >> uint32_t zero_num = pages->num - pages->normal_num; > >> - int i; > >> > >> - packet->flags = cpu_to_be32(p->flags); > >> packet->pages_alloc = cpu_to_be32(pages->allocated); > >> packet->normal_pages = cpu_to_be32(pages->normal_num); > >> packet->zero_pages = cpu_to_be32(zero_num); > >> - packet->next_packet_size = cpu_to_be32(p->next_packet_size); > > > > Definitely good intention, but I had a feeling that this will need to be > > reorganized again when Maciej reworks on top, due to the fact that > > next_packet_size will be ram-private field, simply because it's defined > > after pages_alloc and normal_pages... > > > > E.g., see: > > > > https://lore.kernel.org/r/41dedaf2c9abebb5e45f88c052daa26320715a92.1718717584.git.maciej.szmigiero@oracle.com > > > > Where the new MultiFDPacketHdr_t cannot include next_packet_size (even if > > VFIO will need that too..). > > Isn't it just a matter of setting next_packet_size in the other path as > well? > > @Maciej, can you comment? > > > > > typedef struct { > > uint32_t magic; > > uint32_t version; > > uint32_t flags; > > } __attribute__((packed)) MultiFDPacketHdr_t; > > > > So _maybe_ it's easier we drop this patch and leave that part to Maciej to > > identify which is common and which is arm/vfio specific. No strong > > opinions here. > > > > I could drop it if that's preferrable. However, patch 8/9 is absolutely > necessary so we can remove this madness of having to clear > MultiFDPages_t fields at the multifd_send_thread() top level. It took me > a whole day to figure that one out and that bug has been manifesting > ever since I started working on multifd. > > I'm not sure how we'll do that without this patch. Maybe it's better I > fix in this one whatever you guys think needs fixing. You can set next_packet_size only in ram path, or you can keep this patch as is and let Maciej rework it on top. I'm fine either way.
On 22.07.2024 23:06, Peter Xu wrote: > On Mon, Jul 22, 2024 at 05:34:44PM -0300, Fabiano Rosas wrote: >> Peter Xu <peterx@redhat.com> writes: >> >>> On Mon, Jul 22, 2024 at 02:59:12PM -0300, Fabiano Rosas wrote: >>>> While we cannot yet disentangle the multifd packet from page data, we >>>> can make the code a bit cleaner by setting the page-related fields in >>>> a separate function. >>>> >>>> Signed-off-by: Fabiano Rosas <farosas@suse.de> >>>> --- >>>> migration/multifd.c | 97 ++++++++++++++++++++++++++++----------------- >>>> 1 file changed, 61 insertions(+), 36 deletions(-) >>>> >>>> diff --git a/migration/multifd.c b/migration/multifd.c >>>> index fcdb12e04f..d25b8658b2 100644 >>>> --- a/migration/multifd.c >>>> +++ b/migration/multifd.c >>>> @@ -409,65 +409,62 @@ static int multifd_recv_initial_packet(QIOChannel *c, Error **errp) >>>> return msg.id; >>>> } >>>> >>>> -void multifd_send_fill_packet(MultiFDSendParams *p) >>>> +static void multifd_ram_fill_packet(MultiFDSendParams *p) >>>> { >>>> MultiFDPacket_t *packet = p->packet; >>>> MultiFDPages_t *pages = &p->data->u.ram; >>>> - uint64_t packet_num; >>>> uint32_t zero_num = pages->num - pages->normal_num; >>>> - int i; >>>> >>>> - packet->flags = cpu_to_be32(p->flags); >>>> packet->pages_alloc = cpu_to_be32(pages->allocated); >>>> packet->normal_pages = cpu_to_be32(pages->normal_num); >>>> packet->zero_pages = cpu_to_be32(zero_num); >>>> - packet->next_packet_size = cpu_to_be32(p->next_packet_size); >>> >>> Definitely good intention, but I had a feeling that this will need to be >>> reorganized again when Maciej reworks on top, due to the fact that >>> next_packet_size will be ram-private field, simply because it's defined >>> after pages_alloc and normal_pages... >>> >>> E.g., see: >>> >>> https://lore.kernel.org/r/41dedaf2c9abebb5e45f88c052daa26320715a92.1718717584.git.maciej.szmigiero@oracle.com >>> >>> Where the new MultiFDPacketHdr_t cannot include next_packet_size (even if >>> VFIO will need that too..). >> >> Isn't it just a matter of setting next_packet_size in the other path as >> well? >> >> @Maciej, can you comment? >> >>> >>> typedef struct { >>> uint32_t magic; >>> uint32_t version; >>> uint32_t flags; >>> } __attribute__((packed)) MultiFDPacketHdr_t; >>> >>> So _maybe_ it's easier we drop this patch and leave that part to Maciej to >>> identify which is common and which is arm/vfio specific. No strong >>> opinions here. >>> >> >> I could drop it if that's preferrable. However, patch 8/9 is absolutely >> necessary so we can remove this madness of having to clear >> MultiFDPages_t fields at the multifd_send_thread() top level. It took me >> a whole day to figure that one out and that bug has been manifesting >> ever since I started working on multifd. >> >> I'm not sure how we'll do that without this patch. Maybe it's better I >> fix in this one whatever you guys think needs fixing. > > You can set next_packet_size only in ram path, or you can keep this patch > as is and let Maciej rework it on top. > > I'm fine either way. > I need to split out the packet header parsing ("unfilling") anyway from RAM / device state parsing (to detect the packet type before reading the rest of it to the appropriate data structure) so either way is fine with me too. I think if it's easier for Fabiano to work on top of this patch then he should just keep it. Thanks, Maciej
diff --git a/migration/multifd.c b/migration/multifd.c index fcdb12e04f..d25b8658b2 100644 --- a/migration/multifd.c +++ b/migration/multifd.c @@ -409,65 +409,62 @@ static int multifd_recv_initial_packet(QIOChannel *c, Error **errp) return msg.id; } -void multifd_send_fill_packet(MultiFDSendParams *p) +static void multifd_ram_fill_packet(MultiFDSendParams *p) { MultiFDPacket_t *packet = p->packet; MultiFDPages_t *pages = &p->data->u.ram; - uint64_t packet_num; uint32_t zero_num = pages->num - pages->normal_num; - int i; - packet->flags = cpu_to_be32(p->flags); packet->pages_alloc = cpu_to_be32(pages->allocated); packet->normal_pages = cpu_to_be32(pages->normal_num); packet->zero_pages = cpu_to_be32(zero_num); - packet->next_packet_size = cpu_to_be32(p->next_packet_size); - - packet_num = qatomic_fetch_inc(&multifd_send_state->packet_num); - packet->packet_num = cpu_to_be64(packet_num); if (pages->block) { strncpy(packet->ramblock, pages->block->idstr, 256); } - for (i = 0; i < pages->num; i++) { + for (int i = 0; i < pages->num; i++) { /* there are architectures where ram_addr_t is 32 bit */ uint64_t temp = pages->offset[i]; packet->offset[i] = cpu_to_be64(temp); } - p->packets_sent++; p->total_normal_pages += pages->normal_num; p->total_zero_pages += zero_num; +} - trace_multifd_send(p->id, packet_num, pages->normal_num, zero_num, +void multifd_send_fill_packet(MultiFDSendParams *p) +{ + MultiFDPacket_t *packet = p->packet; + uint64_t packet_num; + + memset(packet, 0, p->packet_len); + + packet->magic = cpu_to_be32(MULTIFD_MAGIC); + packet->version = cpu_to_be32(MULTIFD_VERSION); + + packet->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); + packet->packet_num = cpu_to_be64(packet_num); + + p->packets_sent++; + + multifd_ram_fill_packet(p); + + trace_multifd_send(p->id, packet_num, + be32_to_cpu(packet->normal_pages), + be32_to_cpu(packet->zero_pages), p->flags, p->next_packet_size); } -static int multifd_recv_unfill_packet(MultiFDRecvParams *p, Error **errp) +static int multifd_ram_unfill_packet(MultiFDRecvParams *p, Error **errp) { MultiFDPacket_t *packet = p->packet; int i; - packet->magic = be32_to_cpu(packet->magic); - if (packet->magic != MULTIFD_MAGIC) { - error_setg(errp, "multifd: received packet " - "magic %x and expected magic %x", - packet->magic, MULTIFD_MAGIC); - return -1; - } - - packet->version = be32_to_cpu(packet->version); - if (packet->version != MULTIFD_VERSION) { - error_setg(errp, "multifd: received packet " - "version %u and expected version %u", - packet->version, MULTIFD_VERSION); - return -1; - } - - p->flags = be32_to_cpu(packet->flags); - packet->pages_alloc = be32_to_cpu(packet->pages_alloc); /* * If we received a packet that is 100 times bigger than expected @@ -496,15 +493,9 @@ static int multifd_recv_unfill_packet(MultiFDRecvParams *p, Error **errp) return -1; } - p->next_packet_size = be32_to_cpu(packet->next_packet_size); - p->packet_num = be64_to_cpu(packet->packet_num); - p->packets_recved++; p->total_normal_pages += p->normal_num; p->total_zero_pages += p->zero_num; - trace_multifd_recv(p->id, p->packet_num, p->normal_num, p->zero_num, - p->flags, p->next_packet_size); - if (p->normal_num == 0 && p->zero_num == 0) { return 0; } @@ -546,6 +537,40 @@ static int multifd_recv_unfill_packet(MultiFDRecvParams *p, Error **errp) return 0; } +static int multifd_recv_unfill_packet(MultiFDRecvParams *p, Error **errp) +{ + MultiFDPacket_t *packet = p->packet; + int ret = 0; + + packet->magic = be32_to_cpu(packet->magic); + if (packet->magic != MULTIFD_MAGIC) { + error_setg(errp, "multifd: received packet " + "magic %x and expected magic %x", + packet->magic, MULTIFD_MAGIC); + return -1; + } + + packet->version = be32_to_cpu(packet->version); + if (packet->version != MULTIFD_VERSION) { + error_setg(errp, "multifd: received packet " + "version %u and expected version %u", + packet->version, MULTIFD_VERSION); + return -1; + } + + p->flags = be32_to_cpu(packet->flags); + p->next_packet_size = be32_to_cpu(packet->next_packet_size); + p->packet_num = be64_to_cpu(packet->packet_num); + p->packets_recved++; + + ret = multifd_ram_unfill_packet(p, errp); + + trace_multifd_recv(p->id, p->packet_num, p->normal_num, p->zero_num, + p->flags, p->next_packet_size); + + return ret; +} + static bool multifd_send_should_exit(void) { return qatomic_read(&multifd_send_state->exiting);
While we cannot yet disentangle the multifd packet from page data, we can make the code a bit cleaner by setting the page-related fields in a separate function. Signed-off-by: Fabiano Rosas <farosas@suse.de> --- migration/multifd.c | 97 ++++++++++++++++++++++++++++----------------- 1 file changed, 61 insertions(+), 36 deletions(-)