[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] xennet_start_xmit assumptions
On (01/19/17 11:31), Paul Durrant wrote: > Sowmini, > > Yeah, it would be useful to verify any change fixes the particular > issue you're seeing so please share the program. For the non-empty > non-linear case I'd hope that catching this and doing a pull of some > sensible amount of header (which might coincide with the least amount > that netback expects to see in the first frag) would be enough. > I can take a shot at a patch for this in the next few days; I'll add > your 'Reported-by' so you should get cc-ed. Sounds good, here is the test program (very basic, no error checks!). I think you can probably massage the pf_packet code to send down a purely non-linear skb, I can take a look at what this involves and get back to you. #include <stdio.h> #include <sys/types.h> #include <sys/socket.h> #include <sys/ioctl.h> #include <netinet/in.h> #include <net/if.h> #include <stdio.h> #include <errno.h> #include <stdlib.h> #include <string.h> #include <unistd.h> #include <ctype.h> #include <string.h> #include <linux/if_packet.h> #include <linux/if_ether.h> int main(int argc, char *argv[]) { struct ifreq ifr; int sockfd = socket(AF_INET, SOCK_DGRAM, 0); struct sockaddr_ll sll; int fd; struct msghdr msg; bzero(&ifr, sizeof (ifr)); strncpy(ifr.ifr_name, argv[1], sizeof(ifr.ifr_name)); ioctl(sockfd, SIOCGIFHWADDR, &ifr); bzero(&sll, sizeof (sll)); sll.sll_family = PF_PACKET; sll.sll_halen = ETH_ALEN; sll.sll_ifindex = if_nametoindex(argv[1]); memcpy(sll.sll_addr, (struct sockaddr *)&(ifr.ifr_hwaddr), ETH_ALEN); fd = socket(PF_PACKET, SOCK_RAW, htons(ETH_P_ALL)); bind(fd, (struct sockaddr *)&sll, sizeof(sll)); bzero(&msg, sizeof (msg)); msg.msg_name = (void *)&sll; msg.msg_namelen = sizeof (struct sockaddr_ll); sendmsg(fd, &msg, 0); fprintf(stderr, "sent!\n"); } _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx https://lists.xen.org/xen-devel
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