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a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=susede1; t=1707980161; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=1Cx2zmy0kYHTdVFW0XAu4VXbYGYjbC4IGhNjDXCFbLc=; b=Xtk3g5xuR3Vh36Sdmx54bP9VKA0xFnPnQnkR2e4QsADoN4OSH99lVehaLMmT6V/Iyqp3A6 u03WJuvTR49Gfc8vWj3JJed/irP3CM1LPLCDJmEqjGPVOcHIDt8Rjaxlf+iBxMcbzWV1M0 +3wZtNOzWta6gawDNUa1/SD4/zYmf0I= From: Juergen Gross To: xen-devel@lists.xenproject.org Cc: Juergen Gross , Wei Liu , Anthony PERARD , Jason Andryuk Subject: [PATCH v6 03/21] tools/xen-9pfsd: add transport layer Date: Thu, 15 Feb 2024 07:55:23 +0100 Message-Id: <20240215065541.21067-4-jgross@suse.com> X-Mailer: git-send-email 2.35.3 In-Reply-To: <20240215065541.21067-1-jgross@suse.com> References: <20240215065541.21067-1-jgross@suse.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Authentication-Results: smtp-out2.suse.de; none X-Spamd-Result: default: False [1.90 / 50.00]; ARC_NA(0.00)[]; RCVD_VIA_SMTP_AUTH(0.00)[]; FROM_HAS_DN(0.00)[]; TO_DN_SOME(0.00)[]; FREEMAIL_ENVRCPT(0.00)[gmail.com]; R_MISSING_CHARSET(2.50)[]; MIME_GOOD(-0.10)[text/plain]; TO_MATCH_ENVRCPT_ALL(0.00)[]; BROKEN_CONTENT_TYPE(1.50)[]; RCPT_COUNT_FIVE(0.00)[5]; RCVD_COUNT_THREE(0.00)[3]; DKIM_SIGNED(0.00)[suse.com:s=susede1]; MID_CONTAINS_FROM(1.00)[]; DBL_BLOCKED_OPENRESOLVER(0.00)[suse.com:email]; FUZZY_BLOCKED(0.00)[rspamd.com]; FROM_EQ_ENVFROM(0.00)[]; MIME_TRACE(0.00)[0:+]; FREEMAIL_CC(0.00)[suse.com,xen.org,citrix.com,gmail.com]; RCVD_TLS_ALL(0.00)[]; BAYES_HAM(-3.00)[100.00%] X-Spam-Level: * X-Spam-Score: 1.90 X-Spam-Flag: NO X-ZohoMail-DKIM: pass (identity @suse.com) X-ZM-MESSAGEID: 1707980177735100003 Content-Type: text/plain; charset="utf-8" Add the transport layer of 9pfs. This is basically the infrastructure to receive requests from the frontend and to send the related answers via the rings. Signed-off-by: Juergen Gross Reviewed-by: Jason Andryuk Acked-by: Anthony PERARD --- V2: - rename put_request_bytes() (Jason Andryuk) - rename get_request_bytes() and put_response_bytes() len parameter (Jason Andryuk) - don't unmask event channel if error indicator is set (Jason Andryuk) --- tools/9pfsd/io.c | 143 +++++++++++++++++++++++++++++++++++++++- tools/9pfsd/xen-9pfsd.h | 16 +++++ 2 files changed, 156 insertions(+), 3 deletions(-) diff --git a/tools/9pfsd/io.c b/tools/9pfsd/io.c index eb7c136e09..4312a62dfe 100644 --- a/tools/9pfsd/io.c +++ b/tools/9pfsd/io.c @@ -6,39 +6,176 @@ * Copyright (C) 2024 Juergen Gross * * I/O thread handling. + * + * Only handle one request at a time, pushing out the complete response + * before looking for the next request. */ =20 #include +#include #include #include +#include /* For cpu barriers. */ +#include =20 #include "xen-9pfsd.h" =20 +/* + * Note that the ring names "in" and "out" are from the frontend's + * perspective, so the "in" ring will be used for responses to the fronten= d, + * while the "out" ring is used for requests from the frontend to the + * backend. + */ +static unsigned int ring_in_free(struct ring *ring) +{ + unsigned int queued; + + queued =3D xen_9pfs_queued(ring->prod_pvt_in, ring->intf->in_cons, + ring->ring_size); + xen_rmb(); + + return ring->ring_size - queued; +} + +static unsigned int ring_out_data(struct ring *ring) +{ + unsigned int queued; + + queued =3D xen_9pfs_queued(ring->intf->out_prod, ring->cons_pvt_out, + ring->ring_size); + xen_rmb(); + + return queued; +} + +static unsigned int get_request_bytes(struct ring *ring, unsigned int off, + unsigned int total_len) +{ + unsigned int size; + unsigned int out_data =3D ring_out_data(ring); + RING_IDX prod, cons; + + size =3D min(total_len - off, out_data); + prod =3D xen_9pfs_mask(ring->intf->out_prod, ring->ring_size); + cons =3D xen_9pfs_mask(ring->cons_pvt_out, ring->ring_size); + xen_9pfs_read_packet(ring->buffer + off, ring->data.out, size, + prod, &cons, ring->ring_size); + + xen_rmb(); /* Read data out before setting visible consumer.= */ + ring->cons_pvt_out +=3D size; + ring->intf->out_cons =3D ring->cons_pvt_out; + + /* Signal that more space is available now. */ + xenevtchn_notify(xe, ring->evtchn); + + return size; +} + +static unsigned int put_response_bytes(struct ring *ring, unsigned int off, + unsigned int total_len) +{ + unsigned int size; + unsigned int in_data =3D ring_in_free(ring); + RING_IDX prod, cons; + + size =3D min(total_len - off, in_data); + prod =3D xen_9pfs_mask(ring->prod_pvt_in, ring->ring_size); + cons =3D xen_9pfs_mask(ring->intf->in_cons, ring->ring_size); + xen_9pfs_write_packet(ring->data.in, ring->buffer + off, size, + &prod, cons, ring->ring_size); + + xen_wmb(); /* Write data out before setting visible producer= . */ + ring->prod_pvt_in +=3D size; + ring->intf->in_prod =3D ring->prod_pvt_in; + + return size; +} + static bool io_work_pending(struct ring *ring) { if ( ring->stop_thread ) return true; - return false; + if ( ring->error ) + return false; + return ring->handle_response ? ring_in_free(ring) : ring_out_data(ring= ); } =20 void *io_thread(void *arg) { struct ring *ring =3D arg; + unsigned int count =3D 0; + struct p9_header hdr; + bool in_hdr =3D true; + + ring->max_size =3D ring->ring_size; + ring->buffer =3D malloc(ring->max_size); + if ( !ring->buffer ) + { + syslog(LOG_CRIT, "memory allocation failure!"); + return NULL; + } =20 while ( !ring->stop_thread ) { pthread_mutex_lock(&ring->mutex); if ( !io_work_pending(ring) ) { - if ( xenevtchn_unmask(xe, ring->evtchn) < 0 ) + if ( !ring->error && xenevtchn_unmask(xe, ring->evtchn) < 0 ) syslog(LOG_WARNING, "xenevtchn_unmask() failed"); pthread_cond_wait(&ring->cond, &ring->mutex); } pthread_mutex_unlock(&ring->mutex); =20 - /* TODO: I/O handling. */ + if ( ring->stop_thread || ring->error ) + continue; + + if ( !ring->handle_response ) + { + if ( in_hdr ) + { + count +=3D get_request_bytes(ring, count, sizeof(hdr)); + if ( count !=3D sizeof(hdr) ) + continue; + hdr =3D *(struct p9_header *)ring->buffer; + if ( hdr.size > ring->max_size || hdr.size < sizeof(hdr) ) + { + syslog(LOG_ERR, "%u.%u specified illegal request lengt= h %u", + ring->device->domid, ring->device->devid, hdr.s= ize); + ring->error =3D true; + continue; + } + in_hdr =3D false; + } + + count +=3D get_request_bytes(ring, count, hdr.size); + if ( count < hdr.size ) + continue; + + /* TODO: handle request (will rewrite hdr.size). */ + + ring->handle_response =3D true; + hdr.size =3D ((struct p9_header *)ring->buffer)->size; + count =3D 0; + } + + if ( ring->handle_response ) + { + count +=3D put_response_bytes(ring, count, hdr.size); + + if ( count =3D=3D hdr.size ) + { + /* Signal presence of response. */ + xenevtchn_notify(xe, ring->evtchn); + + ring->handle_response =3D false; + in_hdr =3D true; + count =3D 0; + } + } } =20 + free(ring->buffer); + ring->thread_active =3D false; =20 return NULL; diff --git a/tools/9pfsd/xen-9pfsd.h b/tools/9pfsd/xen-9pfsd.h index ff3562164a..d587f59a32 100644 --- a/tools/9pfsd/xen-9pfsd.h +++ b/tools/9pfsd/xen-9pfsd.h @@ -15,6 +15,12 @@ #define MAX_RING_ORDER 9 #define MAX_OPEN_FILES_DEFAULT 5 =20 +struct p9_header { + uint32_t size; + uint8_t cmd; + uint16_t tag; +} __attribute__((packed)); + typedef struct device device; =20 struct ring { @@ -29,7 +35,17 @@ struct ring { struct xen_9pfs_data_intf *intf; unsigned int ring_order; RING_IDX ring_size; + + /* Transport layer data. */ struct xen_9pfs_data data; + RING_IDX prod_pvt_in; + RING_IDX cons_pvt_out; + + /* Request and response handling. */ + uint32_t max_size; + bool error; /* Protocol error - stop processing. */ + bool handle_response; /* Main loop now handling response. */ + void *buffer; /* Request/response buffer. */ }; =20 struct device { --=20 2.35.3